U.S. patent application number 15/979358 was filed with the patent office on 2019-01-17 for bridge span replacement system.
This patent application is currently assigned to WESTERN MECHANICAL ELECTRICAL MILLWRIGHT SERVICES LTD.. The applicant listed for this patent is WESTERN MECHANICAL ELECTRICAL MILLWRIGHT SERVICES LTD.. Invention is credited to Mark Carney, Rob Doucet, Larry Elisses.
Application Number | 20190016570 15/979358 |
Document ID | / |
Family ID | 50240206 |
Filed Date | 2019-01-17 |
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United States Patent
Application |
20190016570 |
Kind Code |
A1 |
Carney; Mark ; et
al. |
January 17, 2019 |
BRIDGE SPAN REPLACEMENT SYSTEM
Abstract
A vertically-adjustable gantry assembly installation for removal
or placement of a train bridge-span of the type which spans and
supported by two piers, comprises a gantry assembly positioned on
load-bearing first ground-support locations, the gantry assembly
comprising a gantry and a ground-engaging vertical support and lift
system, the vertical support and lift system adapted for supporting
a combined weight of the gantry and bridge span in at least one
operational vertical position above respective bridge span
support-surfaces of the piers including a position corresponding to
a disembarking plane in which the leg portions are extended from a
viewed portion to an extent as least sufficient for the gantry
assembly to self-liftoff the pre-installation conveyance system
onto the first ground-support locations to effect the gantry
assembly installation.
Inventors: |
Carney; Mark; (Barrie,
CA) ; Doucet; Rob; (Barrie, CA) ; Elisses;
Larry; (Barrie, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
WESTERN MECHANICAL ELECTRICAL MILLWRIGHT SERVICES LTD. |
Barrie |
|
CA |
|
|
Assignee: |
WESTERN MECHANICAL ELECTRICAL
MILLWRIGHT SERVICES LTD.
Barrie
CA
|
Family ID: |
50240206 |
Appl. No.: |
15/979358 |
Filed: |
May 14, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15238433 |
Aug 16, 2016 |
9969601 |
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15979358 |
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14883359 |
Oct 14, 2015 |
9416505 |
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15238433 |
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14169445 |
Jan 31, 2014 |
9163367 |
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14883359 |
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13787461 |
Mar 6, 2013 |
8671490 |
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14169445 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E01D 21/06 20130101;
B66C 19/005 20130101; B66C 19/02 20130101; E01D 22/00 20130101;
B66C 13/04 20130101; B66C 19/002 20130101; B66C 17/20 20130101;
B66C 5/04 20130101 |
International
Class: |
B66C 17/20 20060101
B66C017/20; B66C 13/04 20060101 B66C013/04; B66C 5/04 20060101
B66C005/04; B66C 19/00 20060101 B66C019/00; E01D 21/06 20060101
E01D021/06; E01D 22/00 20060101 E01D022/00; B66C 19/02 20060101
B66C019/02 |
Claims
1. A method of removing an existing train bridge span, of the type
supported on two piers of a train bridge, when installing a
replacement train bridge span, the existing train bridge span
supporting a length of track overlying the existing bridge span
that is in line with a railroad track extending between railroad
service areas on either side of the bridge, the method comprising:
(a) using the railroad track to bring a gantry assembly including a
gantry, on a rail vehicle, from one side of the train bridge into
horizontal alignment with ground-support locations such that the
gantry assembly is positioned over the existing bridge span, the
ground support locations supporting a vertical load predetermined
to accommodate lifting the existing bridge span with the gantry
assembly and located to provide support at positions on both sides
of the bridge and on both sides of the railroad track, the
positions predetermined to accommodate lifting the existing train
bridge span from beneath the gantry assembly and conveying the
existing train bridge span away from beneath the gantry assembly;
and (b) causing the gantry assembly to self-lift off the rail
vehicle onto the ground support locations.
2. A method according to claim 1, wherein the ground support
locations on opposite sides of the bridge are positioned at a
distance from one another which spans a section of the railroad
track that is greater than the length of track overlying the
existing train bridge span.
3. A method according to claim 1, wherein the ground support
locations, on immediately opposite sides of the railroad track, are
positioned at a distance from one another which allows a rail
conveyance system carrying a bridge span with a footprint wider
than the gantry to pass in and out from beneath the gantry
assembly.
4. A method according to claim 2, wherein the ground support
locations, on immediately opposite sides of the railroad track, are
positioned at a distance from each other which allows a rail
conveyance system carrying a bridge span with a footprint wider
than the gantry to pass in and out from beneath the gantry
assembly.
5. A method according to claim 2, further comprising the step of
installing support beams under the track at both ends of the
predetermined section of the railroad track.
6. A method according to claim 5, further comprising the step of
securing ground engaging portions of the gantry assembly to the
support beams.
7. A method according to claim 1, further comprising the steps of
lifting the existing train bridge span, conveying the existing
train bridge span underneath the gantry and lowering the existing
train bridge span onto a rail conveyance system positioned beneath
the gantry assembly; and removing the existing train bridge span
from beneath the gantry assembly on the rail conveyance system.
8. A method according to claim 7, further comprising the steps of
conveying the replacement train bridge span underneath the gantry
assembly on a rail conveyance system; lifting the replacement
bridge span; conveying the replacement train span underneath the
gantry into a position overlying bridge span support surfaces of
the piers; and lowering the replacement train bridge span onto the
bridge span support surfaces.
9. A method according to claim 4, wherein the gantry assembly
includes a vertical support and lift system including outrigger
portions and leg portions extending vertically from the outrigger
portions, wherein the leg portions are in a retracted position
above the railroad track when the gantry assembly is first brought
in on the rail vehicle from one side of the train bridge, and
wherein the vertical support and lift system is operable to extend
the leg portions from the retracted position to cause the gantry
assembly to self-lift onto the ground-support locations.
10. A method according to claim 9, wherein outrigger portions are
movable between a stowed position in which the outrigger portions
are rotated towards the gantry and a laterally extended position,
and wherein the outrigger portions are in a stowed position when
the gantry assembly is first brought in on the rail vehicle from
one side of the train bridge, and wherein the outrigger portions
are moved into and secured in laterally extended positions before
the vertical support and lift system causes the gantry assembly to
self-lift onto the ground-support locations.
11. A gantry assembly installation adapted for removing an existing
train bridge span, of the type supported on two piers of a train
bridge, and installing a replacement train bridge span, the
existing train bridge span supporting a length of track overlying
the existing bridge span that is in line with a railroad track
extending between railroad service areas on either side of the
bridge, the gantry assembly installation comprising: a gantry
assembly including a gantry and vertical support and lift system,
the gantry assembly including leg portions, the leg portions
including ground engaging portions secured to ground-support
locations, the ground engaging portions positioned to provide
vertical support for the gantry assembly at positions on both sides
of the bridge and on both sides of the railroad track such that the
existing train bridge span can be lifted from beneath the gantry
assembly and conveyed away from the bridge from beneath the gantry
assembly; the ground support locations supporting a vertical load
predetermined to accommodate lifting the existing bridge span with
the gantry assembly and predetermined to align with ground engaging
portions of the leg portions.
12. A gantry assembly installation according to claim 11, wherein
the ground engaging portions, on the same side of the railroad
track, are positioned at a distance from one another across the
bridge which spans a section of the railroad track that is greater
than the length of track overlying the existing train bridge
span.
13. A gantry assembly installation according to claim 11, wherein
the ground engaging portions, on immediately opposite sides of the
railroad track, are positioned at a distance from one another which
allows a rail conveyance system carrying a train bridge span with a
footprint wider than the gantry to pass in and out from beneath the
gantry assembly.
14. A gantry assembly installation according to claim 12, wherein
the ground engaging portions, on immediately opposite sides of the
railroad track, are positioned at a distance from each other which
allows a rail conveyance system carrying a train bridge span with a
footprint wider than the gantry to pass in and out from beneath the
gantry assembly.
15. A gantry assembly installation according to claim 12, wherein
the ground engaging portions are secured to support beams under the
track located at both ends of the section of the railroad
track.
16. A gantry assembly installation according to claim 14, wherein
the vertical support and lift system includes outrigger portions,
the leg portions extending vertically from the outrigger
portions.
17. A gantry assembly installation according to claim 16, wherein
the outrigger portions are configured to be movable between a
stowed position in which the outrigger portions are rotated towards
the gantry and a laterally extended position, and wherein the
outrigger portions are secured in laterally extended positions when
the gantry assembly is installed at the ground support
locations.
18. A gantry assembly installation according to claim 16, wherein
the vertical support and lift system is operatively connected to a
power system and a control system, the power system and control
system operable to vary the linear vertical distance between the
ground engaging portions of the leg portions and the gantry, and to
control the vertical height of the gantry when the existing train
bridge span or the replacement train bridge span is suspended from
the gantry.
19. A gantry assembly installation according to claim 11, further
comprising a gantry conveyance system, the gantry conveyance system
including a track and at least one vehicle configured to ride along
the track.
20. A gantry assembly installation according to claim 19, wherein
the gantry conveyance system is operatively associated with a
bridge span connection system for suspending the bridge span from
the gantry conveyance system, the gantry conveyance system and
bridge spars connection system configured to provide at least two
conveyable, separately locatable, suspension means for suspending
the bridge span beneath the gantry.
21-25. (canceled)
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of co-pending application
Ser. No. 14/883,359; filed on Oct. 14, 2015, now U.S. Pat. No.
9,416,505, issued on Aug. 16, 2016, which is a continuation of
application Ser. No. 14/169,445; filed Jan. 31, 2014, now U.S. Pat.
No. 9,163,367, issued Oct. 20, 2015, which is a continuation of
application Ser. No. 13/787,461; filed on Mar. 6, 2013, now U.S.
Pat. No. 8,671,490, issued Mar. 18, 2014. The disclosures of all of
these applications are incorporated herein by reference in their
entireties.
FIELD OF THE INVENTION
[0002] The present invention relates to a method, system, apparatus
and installation for replacing a train bridge span.
BACKGROUND OF THE INVENTION
[0003] Trains that travel through urban and rural areas need to
cross over roads, hilly terrain and terrain interrupted by other
natural vehicle barriers including bodies of water. Train tracks
crossing a train bridge are often supported on a replaceable bridge
span supported by two piers. Bridge spans can last for decades but
increasingly undergo weakening corrosion, develop faults and
eventually need to be replaced.
[0004] Bridge spans can weigh, on average, as much as 150 tons, and
can be as long as 30 meters so that they span two supporting piers.
Accordingly, replacing a bridge span can pose considerable
challenges.
[0005] For example, a train bridge may be located in areas that are
difficult to access with cranes and other types of conventional
heavy equipment of the type needed to replace a 150 ton bridge
span. For example, it is known to use specialized barges and ground
equipment to assist in removal and installation of a bridge span
from a roadway or waterway beneath the bridge. However, access from
beneath a bridge is only possible where the underlying area is
accessible by large vehicles or navigable by large floating
vessels.
[0006] If multiple bridge spans need to be replaced on a particular
bridge, a specialized gantry crane may need to be constructed on
site in a manner which enables the crane to be sequentially
re-positioned on more than one pair of adjacent piers.
[0007] Furthermore, a site of span replacement may be an
environmentally sensitive area than would be damaged by bringing in
conventional or specialized equipment.
[0008] Furthermore, replacing a bridge span may interrupt train
traffic for a considerable period of time. The down-time costs
railway companies and the industries they service large sums in
lost time and/or revenues.
[0009] Accordingly, there is a need for a rapid, agile, broadly
usable and environmentally safe form of train bridge span
replacement that accommodates span removal and installation at
single and multiple bridge-span replacement sites.
SUMMARY OF THE INVENTION
[0010] The invention will now be described in several aspects
including a gantry assembly, a system in which the gantry assembly
is a component in which different conveyance systems are used in
cooperation with the gantry assembly, a gantry assembly
installation in which the gantry assembly is installed at a
particular location and in a particular manner, a method for
installing a gantry assembly at a bridge span replacement site, a
method of removing an existing bridge span and a method of
installing a view bridge span.
[0011] According to one aspect, the invention is directed to a
vertically-adjustable gantry assembly installation as defined
below:
[0012] A vertically-adjustable gantry assembly installation adapted
for removal or placement of a train bridge-span of the type which
spans and is supported by two piers, comprising:
[0013] A gantry assembly positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the gantry
assembly adapted to support a gantry conveyance system;
[0014] the vertical support and lift system adapted for supporting
the gantry in at least one operational vertical position above
respective bridge span support-surfaces of the piers including a
position corresponding to a disembarking plane in which the leg
portions are extended from a stowed position so an extent
sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground-support
locations to effect the gantry assembly installation.
[0015] Optionally, the vertical support and lift system is
operatively associated with a power system and a control system,
for example an integrated or separate hydraulic power unit which is
controlled by a control system to extend the legs from a stowed
position in order to effect a gantry installation.
[0016] According to another embodiment the invention is directed to
a vertically-adjustable gantry assembly installation adapted for
removal or placement of a train-bridge-span of the type which spans
and is supported by two piers, comprising:
[0017] A gantry assembly positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the gantry
assembly adapted to operatively associated with a gantry conveyance
system adapted to support the weight of the bridge span and a
ground conveyance system;
[0018] the vertical support and lift system including leg portions
having ground engaging portions and a gantry connection portion
including an outrigger portion, the vertical support and lift
system adapted for supporting a combined weight of the gantry and a
bridge span in at least one operational vertical position above
respective bridge span support-surfaces of the piers including a
position corresponding to a horizontal transport plane in which the
bridge span is conveyed by the gantry conveyance system along at
least a portion of gantry.
[0019] The gantry assembly installation is adapted to transfer a
load corresponding to the weight of the bridge span from the gantry
conveyance system to the ground conveyance system.
[0020] The load corresponding to the weight of the bridge is
optionally transferred in stages, for example, a load corresponding
to a forward end of the bridge span may be transferred first
followed by a load corresponding to a rearward end of the bridge
span.
[0021] In a related aspect, another embodiment:
[0022] A vertically-adjustable gantry assembly installation adapted
for remove or placement of a train bridge-span of the type which
spans and is supported by two piers, comprising:
[0023] A gantry assembly positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the gantry
assembly adapted to operatively associated with a gantry conveyance
system and a ground conveyance system;
[0024] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span in at least one
operational vertical position above respective bridge span
support-surfaces of the piers including a position corresponding to
a disembarking plane in which the gantry assembly is adapted to
self-liftoff the pre-installation conveyance system onto the first
ground-support locations to effect the gantry assembly
installation, the vertical support and lift system including leg
portions, the leg portions including ground engaging portions, the
ground engaging portions including overhang portions of a ground
support structure, the leg portions adapted to be used with or
operatively associated with an alignment system, the alignment
system optionally including an abutment member (e.g. on the ground
engaging portions or overhang portions of the ground support
structure) for aligning the overhang portions with ground-supported
portions of the ground support structure.
[0025] In a related aspect, the invention is also directed to a
vertically-adjustable gantry assembly installation adapted for
removal or placement of a train bridge-span of the type which spans
and is supported by two piers, comprising:
[0026] A gantry assembly securely positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the
vertical support and lift system operatively associated wish a
power system and a control system, the gantry assembly adapted to
be operatively associated with a gantry conveyance system, the
gantry assembly adapted to be transported in a horizontal position
to a site for placement or removal of a bridge span by a
pre-installation conveyance system (27) including at least one rail
car;
[0027] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span in operational
vertical positions above respective bridge span support-surfaces of
the piers including a position corresponding to as least one
horizontal transport plane in which the bridge span is conveyable
relative to the gantry by the gantry conveyance system and a
disembarking plane in which the leg portions are extended by the
power system from a stowed position to an extent at least
sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground-support
locations to effect the gantry assembly installation.
[0028] Additional embodiments of the various embodiments of a
gantry assembly installation, according to one aspect of the
invention, as defined above, will now be summarized.
[0029] Optionally, the vertical support and lift system
includes:
[0030] a load bearing first vertical support assembly operatively
connected to the gantry proximal to a first end thereof; and
[0031] a load-bearing second vertical support assembly operatively
connected to the gantry proximal to a second end thereof.
[0032] Optionally, each vertical support assembly including at
least one leg portion having a ground engaging portion and a gantry
connection portion for connecting the leg portions to the gantry,
the vertical support and lift system including or adapted to be
operatively associated with a power system and a control system to
vary the linear vertical distance between the ground engaging
portion of a leg portion and the gantry to control the vertical
height of the gantry.
[0033] Optionally, the lift system is hydraulically powered.
Optionally, the power system includes a hydraulic power unit
supported by the gantry assembly.
[0034] Optionally, the gantry conveyance system is operatively
connected to a bridge span support system, optionally in the form
of a bridge span connection system for suspending the bridge span
from the gantry conveyance system, the gantry conveyance system and
a bridge span connection system configured to provide at least two
conveyable, separately locatable, suspension means for suspending
the bridge span beneath the gantry.
[0035] The suspension means are optionally two separately locatable
vehicles configured to travel along a track system supported by the
gantry assembly. Optionally, the vehicle(s) is/are adapted to be
hydraulically powered. Optionally, the power system powers the
vertical support and lift system and the vehicle(s).
[0036] Alternatively, the suspension means may vehicles operatively
associated with winches.
[0037] Optionally, the vehicle(s) is/are adapted to independently
support the weight of a bridge span and configured for conveying a
bridge span in a substantially horizontal plane along at least a
portion of the length of the gantry, movement of bridge spun
relative to the gantry via the gantry conveyance system defining at
least a first portion of the horizontal transport plane, the gantry
conveyance system adapted so be operatively associated with a
bridge span connection system configured for suspending the bridge
span from the gantry conveyance system, beneath the gantry, for
conveyance in the horizontal transport plane.
[0038] Optionally, the gantry assembly installation is operatively
associated with a load-bearing ground conveyance system positioned
at load bearing second ground-support locations, the ground
conveyance system including a support portion for supporting a load
comprising the weight of a bridge span, the ground conveyance
system adapted to be transported along a path beginning at the end
of the bridge span and extending away from the bridge span.
[0039] Optionally, the gantry assembly and/or the gantry conveyance
system defining vehicle position limits that delimit a maximum
horizontal travel distance that the at least one vehicle can travel
in the horizontal transport plane when supporting a load comprising
at least a portion of the weight of the bridge span, a vehicle
position limit and/or the path accommodating conveyance of the
bridge through at least a threshold horizontal conveyance distance
required for transferring load support form the gantry conveyance
system to the ground conveyance system and/or from the ground
conveyance system to the gantry conveyance system.
[0040] Optionally, the gantry assembly and/or the gantry conveyance
system at least partially define bridge span position limits that
delimit a minimum horizontal transport distance over which the
bridge span can be conveyed with at least partial load support from
the gantry conveyance system, the minimum horizontal transport
distance extending beyond the first ground locations.
[0041] Optionally, the at least one rail car of the
pre-installation conveyance system define a conveyance system
footprint area including lateral perimeters, the gantry optionally
configured to have a gantry footprint area having lateral
perimeters which fit within the lateral perimeters of the
pre-installation conveyance system, the outrigger portion adapted
to position leg portions of at least one vertical support assembly
beyond the lateral perimeters of the footprint area of the
pre-installation conveyance system, to clear the lateral perimeters
of the pre-installation conveyance system, when the gantry legs are
lowered to effect a gantry installation.
[0042] Optionally, the leg portions are connected to the outrigger
portions of the gantry connection portion (e.g. extend therefrom)
and the outrigger portion together with the leg portions of at
least vertical support assembly are rotationally mounted with
respect to positionally-fixed portions of the gantry connection
portion, for movement about a vertical axis perpendicular to the
longitudinal axis of the gantry between a stowed position in which
the outrigger portion and leg portion are rotated towards the
gantry and a laterally extended installation position, the
outrigger portion and leg portions fastened to the
positionally-fixed portion to prevent rotation and accommodate full
load support in the installation position.
[0043] Optionally, the outrigger portion of the gantry connection
portion is hingedly-mounted to a positionally-fixed portion of the
gantry connection portion.
[0044] The gantry assembly defines a footprint on the
pre-installation conveyance system. Optionally, the lateral
perimeters of the gantry assembly footprint lie within the lateral
perimeters of the footprint area of the pre-installation conveyance
system when the gantry assembly in supported on the
pre-installation conveyance system in a stowed position.
[0045] Optionally, the lateral perimeters of the gantry assembly
footprint, when in the stowed position, falls within existing
railway clearances for the delivering the gantry assembly to or
from a site of placement or removal of a bridge span.
[0046] Optionally, the overall footprint of the gantry assembly
supported on the pre-installation conveyance system is accommodated
by existing railway clearances by pre-defined lateral
tolerances.
[0047] Optionally, the overall pre-installation conveyance envelope
of the gantry assembly supported on the pre-installation conveyance
system is accommodated by existing railway clearances by
pre-defined lateral and vertical tolerances. Optionally, the
post-installation conveyance envelope is similarly
accommodated.
[0048] Optionally, each vertical support assembly comprises an
outrigger portion and two leg portions, the leg portions adapted to
be contracted by the vertical support and lift system to occupy a
compact configuration which provides suitable ground clearance in
the stowed position.
[0049] Optionally, the first ground-support locations are ground
locations adapted for load support.
[0050] Optionally, the first ground locations include a
pre-installed ground support structure.
[0051] Optionally, the ground support structure includes
ground-supported portions and overhang portions which have no
direct ground support.
[0052] Optionally, the ground support structure is a ground
engaging load bearing support beam installed over load supporting
ground material at ground locations corresponding to planned ground
positions of ground engaging portion(s) of the first vertical
support assembly and/or the second vertical support assembly.
Optionally, the support beams are steel tie beams at least
partially supported on ground material under portions of a train
track leading respectively to and from an existing bridge span.
[0053] Optionally, these support beams are positioned to have a
top-surface height which provides load-bearing support so the
under-surface of train-track rails proximal to the first ground
locations when the tie beams are supported at respective ground
locations formerly occupied by railway ties.
[0054] Optionally, the ground engaging portions of the leg
portion(s) of the first vertical support assembly and the second
vertical support assembly are adapted to be securely fastened to
the support beam.
[0055] Optionally, the support beam has connection portions for
connecting to the ground engaging portions (e.g. foot portions) of
the leg portions and the foot portions have mating connection
portions.
[0056] Optionally, the tie beam may consist of a pre-installed
middle section and two end sections which are secured to the middle
section when the gantry assembly is installed at the first ground
support locations.
[0057] Optionally, the ground conveyance system comprises as least
one rail car supported on load-bearing second ground locations in
the vicinity of the bridge-span support surface of a pier, the
ground conveyance system adapted to travel on a path defined by
rails of a track used to transpose the gantry assembly or a bridge
span to or from a gantry assembly installation site.
[0058] The path preferably extends a vehicle position limit on at
least one side of the gantry by a distance at least sufficient to
transfer load support from the gantry conveyance system to the
ground conveyance system, optionally by a distance sufficient to
convey the bridge span to an alternate train track.
[0059] Optionally, the horizontal transport plane is vertically
circumscribed by an upper vertical clearance limit defined by a
lower edge of the gantry and a lower vertical clearance limit
defined by a bridge span support surface of the ground conveyance
system.
[0060] Optionally, the bridge span connection system includes a
plurality of straps sized to suspend the bridge span beneath upper
vertical clearance limit.
[0061] Optionally, the control system is operable to raise the
gantry into a vertical position in which the lower vertical
clearance limit is above and clears the support portion of the
first ground conveyance system, the control system operable to
lower the bridge span onto the support surface of the ground
conveyance system.
[0062] Optionally, the pre-installation conveyance system comprises
a support portion adapted to support the gantry assembly.
Optionally, the gantry assembly has a surface configuration adapted
to be supported in a substantially horizontal position on the
support portion. Optionally, the gantry has a flat bottom and the
pre-installation conveyance system has complimentary support
surfaces e.g. flat support bed, optionally outfitted with support
portions that enable the gantry to swing as necessary when the
train track curves e.g. a bolster.
[0063] Optionally, the vertical support and lift system is adapted
to be used with or directly operatively associated with (e.g.
secured to) to an overhang ground-support system for example
overhang portions of a ground support structure. The term "ground
support structure" is used to any structure used to introduce a
load-bearing support feature and/or a stability feature e.g. in
order to enhance or form the first, second or third ground
locations. The ground support structure is optionally operatively
associated with an alignment system, for example a vertical and/or
lateral alignment system, optionally including an alignment means
for aligning the ground engaging portion of the gantry legs with
overhang portions of the overhang ground support system, for
example for aligning connection portions that enable the ground
engaging portions to be connected to the overhang ground support
system. The alignment means may be a vertical alignment means, for
example a projecting abutment portion or other stop means to gauge
or define stop positions when lowering the leg portions from off
the pre-installation conveyance system, for example, so that the
overhang portions of the overhang ground support system are urged
to be arrested into alignment with the ground support portions of
the overhang ground support system. Thus, the overhang ground
support system defines or provides first ground support locations
for supporting the ground engaging vertical support and lift
system. Optionally, the ground engaging portions of the leg
portions are pre-attached to and include the overhang portions of
the ground support structure. In a methodological aspect the method
of the invention optionally includes, preliminary to effecting a
gantry installation, a preliminary ground-support preparation step
optionally including the step of installing the ground support
portions of an overhang ground support system e.g. in the form a
ground support structure like a beam. Optionally, the alignment
system includes accurate positioning the rail carts on the train
track (x axis), accurate positioning of the gantry assembly on the
rail carts (y axis) along with lateral play in mating portions of
the gantry leg and the ground engaging (e.g. shoe or foot) portion
(the foot portion is pinned to the leg portion in a manner in which
provides play in the Y axis) and controlled finally lowering of the
gantry legs (z axis) aided by a vertical alignment system in the
form of an vertical alignment means e.g. a laterally projecting
abutment portion.
[0064] Additional features of the gantry assembly installation are
described below with reference to other aspects of the
invention.
[0065] For example, the gantry conveyance system may be associated
with a spreader structure adapted for supporting the bridge span
from both sides of the gantry.
[0066] Optionally, the gantry conveyance system includes a track
system which includes a track positioned on top or beneath the
gantry.
[0067] Optionally, the gantry assembly comprises right and left
portions spaced to provide clearance for suspension members
belonging to a suspension system, for example a bridge span
connection system in the form of straps operatively connected to
the undersurface of a vehicle or trolley. The term "member" broadly
refers to a part or portion, for example of a structure or system.
The suspension members are optionally be cables which are adapted
for use at a fixed operational length or alternatively are
operatively associated with a winch or a strand jack.
[0068] Similarly, embodiments of the gantry assembly installation
described above may apply to other aspects of the invention, even
though they are not repeated below.
[0069] According to another aspect the invention is directed to a
gantry assembly for removal or placement of a train bridge-span of
the type which spans and is supported by two piers, comprising:
[0070] A gantry;
[0071] A ground-engaging vertical support and lift system;
[0072] the gantry assembly configured to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system (27) including at
least one rail car;
[0073] the vertical support and lift system including:
[0074] a load bearing first vertical support assembly operatively
connected to the gantry proximal to a first end thereof; and
[0075] a load-bearing second vertical support assembly operatively
connected to the gantry proximal to a second end thereof,
[0076] the gantry assembly adapted in support a gantry assembly
conveyance system, the gantry conveyance system adapted to support
the weight of a bridge span and configured for conveying a bridge
span in a horizontal transport plane along at least a portion of
the length of the gantry, the gantry conveyance system adapted to
be operatively associated with a bridge span support system (e.g. a
suspension system) for supporting the bridge span from at least two
positions on the bridge span proximal to the ends of the bridge
span;
[0077] each vertical support assembly including at least one leg
portion having a ground engaging portion and a gantry connection
portion for connecting the leg portions to the gantry, the gantry
connection portion including an outrigger portion, the vertical
support and lift system including or adapted to be operatively
associated with a power system and a control system so vary the
linear vertical distance between the ground engaging portion of a
leg portion and the gantry to control the vertical height of the
gantry, the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span in an operational
vertical positions above the respective bridge span
support-surfaces of the piers including at least one position
corresponding to the horizontal transport plane.
[0078] Optionally, the bridge span support system is a bridge span
connection system, the bridge span connection system optionally
comprising straps.
[0079] Optionally, the gantry conveyance system includes track
system operatively connected to the gantry assembly;
[0080] the gantry assembly and/or the gantry conveyance system
defining horizontal bridge span conveyance limits that delimit a
maximum horizontal travel distance over which the bridge span can
be conveyed by the gantry conveyance system alone in the horizontal
transport plane;
[0081] the gantry conveyance system configured to cooperate with a
load-bearing ground conveyance system including a support portion
for supporting a load comprising the weight of a bridge span, the
ground conveyance system adapted to be transported on a path
extending away from an end of a bridge span, a vehicle position
limit and/or the path accommodating conveyance of the bridge span
through at least a threshold horizontal conveyance distance
required for transferring load support from the gantry conveyance
system to the ground conveyance system and/or from the ground
conveyance system to the gantry conveyance system.
[0082] Optionally, the gantry assembly and/or the gantry conveyance
system at least partially define bridge span position limits that
delimit a minimum horizontal transport distance over which the
bridge span can be conveyed with at least partial load support from
the gantry conveyance system, the minimum horizontal transport
distance extending beyond the first ground locations.
[0083] Optionally, as described above, the gantry conveyance system
and bridge span connection system are configured to provide at
least two conveyable, separately locatable, suspension means for
suspending the bridge span beneath the gantry.
[0084] Optionally, as described above, the at least one rail car of
the pre-installation conveyance system defines a conveyance system
footprint area including lateral perimeters, the outrigger portion
adapted to position leg portions of at least one vertical support
assembly beyond the lateral perimeters of the footprint area of the
pre-installation conveyance system, to clear the lateral perimeters
of the pre-installation conveyance system, when the gantry legs are
lowered to effect a gantry installation.
[0085] Optionally, as described above, the outrigger portion and
leg portions of at least one vertical support assembly are
rotationally mounted, for example, with respect to
positionally-fixed portions of the gantry connection portion, for
movement about a vertical axis perpendicular to the longitudinal
axis of the gantry between a stowed position and a laterally
extended installation position. Optionally, each vertical support
assembly comprises an outrigger portion and two leg portions, the
leg portions adapted to be contracted by the vertical support and
lift system to occupy a compact configuration which provides
suitable ground clearance in the stowed position.
[0086] Optionally, as described above, the first gound-support
locations are ground locations adapted for load support, for
example, by installing a ground engaging load bearing support beam
(9) installed over load supporting ground material at ground
locations corresponding to planned ground positions of ground
engaging portion(s) of the first vertical support assembly and/or
the second vertical support assembly.
[0087] Optionally, as described above, at least one vertical
support position correspond to a disembarking plane in which the
leg portions are extendable e.g. by a power system, from a stowed
position on the pre-installation conveyance system to an extent at
least sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground-support
locations to effect a gantry installation.
[0088] Optionally, as described above, the outrigger portion is
configured to laterally distance at least one leg portion
(preferably both) of at least one vertical support assembly from
lateral perimeters of the gantry, whereby the outrigger portion is
adapted to accommodate passage of a bridge span, having a footprint
wider than the gantry, between the leg portions of at least one
vertical support assembly to accommodate transfer of load support
from the gantry conveyance system to the ground conveyance system
and/or from the ground conveyance system to the gantry conveyance
system.
[0089] Optionally, as described above, the gantry is configured to
have a gantry footprint area having lateral perimeters which fit
within the lateral perimeters of the pre-installation conveyance
system, the outrigger portion adapted to position leg portions of
at least one vertical support assembly beyond the lateral
perimeters of the footprint area of the pre-installation conveyance
system, to clear the lateral perimeters of the pre-installation
conveyance system, when the gantry legs are lowered to effect a
gantry installation.
[0090] Optionally, as described above, the first ground locations
are ground locations adapted for load support, for example, by
installing a ground engaging load bearing support beam positioned
over load supporting ground material at ground locations
corresponding to planned ground positions of ground engaging
portion(s) of the first vertical support assembly and/or the second
vertical support assembly, the ground engaging portions of the leg
portions adapted to be secured to the load bearing support
beam.
[0091] Optionally, as described above, the gantry conveyance system
comprises two separately locatable vehicles powered by a hydraulic
vehicle power system, the vehicles operatively connected to a
vehicle control system for controlling a respective position of the
vehicle on the track system including forward and rearward
movement. Optionally, the control system for controlling the
vertical support and lift system is a remote-control system.
Optionally, the vehicle control system is remote-control system.
Optionally, the two remote-control systems are integrated into a
single control unit adapted to be controlled by a single
operator.
[0092] Optionally, the vehicles are operatively connected to a
spreader structure, the spreader structure oriented transversely
with respect to the longitudinal axis of the gantry for distancing
two points of suspension of the bridge span from the center of
gravity of a vehicle. Optionally, the spreader structure is
configured to suspend the bridge span from two sides of the
gantry.
[0093] Optionally, the bridge span connection system comprises
straps (e.g. webbing made of synthetic fibers, or steel cable, with
a breaking strength adapted to support a portion of the weight of
the bridge span), each end of the spreader structure optionally
displaced sufficiently from a center of gravity of the vehicle to
define a line of sight between a respective end of the spreader
structure and a point of contact or connection of the straps to the
bridge span, each end of the spreader structure operatively
associated with a connector for connecting a strap, for example a
shackle, the webbing or cable optionally looped around the
shackle.
[0094] Optionally, the distance between connectors at opposite ends
of a spreader structure is longer than the width of the gantry.
[0095] Optionally, the bridge span is outfitted with a connector
that receives a strap. Optionally, the connector is adapted to be
attached to a lug on the bridge span. Optionally, the connector is
a shackle.
[0096] A connector is optionally configured so that straps move
transversely with respect to the longitudinal axis of the gantry to
increase transversely play of the straps with respect to the ends
of the spreader structure or the bridge span.
[0097] Optionally, a connector is configured to permit the sling
arm to have play in plane parallel to longitudinal axis of the
gantry, for example, the connector attached to the spreader
structure.
[0098] Optionally, as described above, the vertical support and
lift system is a hydraulically powered, each vertical support
assembly optionally comprising two telescoping leg portions wherein
the linear distance between the ground engaging portion of each leg
portion and the gantry is adapted to be hydraulically varied by the
power system.
[0099] According to another aspect the invention is directed to a
system for removal or placement of a train bridge-span of the type
which spans and is supported by two piers, comprising:
[0100] A gantry assembly comprising a gantry and a vertical support
and lift system including leg portions haying ground engaging
portions adapted to be supported on first ground support
locations;
[0101] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system (27) including at
least one rail car;
[0102] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted to cooperate with a
load-bearing ground conveyance system, the gantry conveyance system
including or operatively associated with bridge support portions
adapted to provide at least two points of support for supporting
the bridge span from two positions on the bridge span proximal to
the ends of the bridge span;
[0103] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span from first
ground-support locations in at least one operational vertical
position above the respective bridge span support-surfaces of the
piers at least one operational vertical position corresponding to
position(s) including at least one horizontal transport plane and a
disembarking plane in which the leg portions are extendable from a
stowed position on the pre-installation conveyance system to an
extent sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground support
locations to effect a gantry installation.
[0104] Optionally, wherein the gantry assembly and/or the gantry
conveyance system define bridge span position limits that delimit a
maximum horizontal travel distance that the bridge span can be
conveyed in the horizontal transport plane when supported by the
gantry conveyance system; and
[0105] the ground conveyance system is adapted to be transported on
a path extending away from a ground position adjacent to an edge of
an existing bridge span, a bridge span position limit and/or the
path accommodating conveyance of the bridge through at least a
threshold horizontal conveyance distance required for transferring
load support from the gantry conveyance system to the ground
conveyance system and/or from the ground conveyance system to the
gantry conveyance system.
[0106] Other embodiments of the system for organizing removal and
replacement of a train bridge span will now be described.
[0107] The system optionally comprising:
[0108] A gantry assembly comprising a gantry and a vertical support
and lift system including leg portions having ground engaging ports
or is adapted to be supported on first ground support
locations;
[0109] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system including at least one
rail car;
[0110] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted for horizontally
conveying a bridge span in a horizontal transport plane relative to
the gantry assembly over distance sufficient to transfer a load
corresponding to the weight of the bridge span in stages onto a
support portion of a ground conveyance system, the gantry
conveyance system including or operatively associated with a
support portion adapted to provide support for supporting the
bridge span from two positions on the bridge span, the positions
proximal to the respective end of the bridge span;
[0111] the vertical support and lift system adapted for supporting
the gantry from first ground-support locations in at least one
operational vertical position above the respective bridge span
support-surfaces of the piers at least one operational vertical
position corresponding to position(s) including a disembarking
plane in which the leg portions are extendable from a stowed
position on the pre-installation conveyance system to an extent
sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground support
locations.
[0112] Optionally, the vertical support and lift system is adapted
for supporting the gantry in the horizontal transport plane.
[0113] Optionally, the gantry assembly and the support portion are
operatively associated with a lift system, the lift system adapted
for raising a bridge from the piers into the horizontal transport
plane and lowering a bridge span onto the piers from a horizontal
transport plane.
[0114] Optionally, the gantry conveyance system is adapted for
horizontally conveying a bridge span in a horizontal transport
plane relative to the gantry assembly over distance sufficient to
transfer a load corresponding to the weight of the bridge span in
stages from a support portion of a ground conveyance system to the
gantry conveyance system.
[0115] According a related aspect, the invention is directed to a
system for removal or placement of a train bridge-span of the type
which spans and is supported by two piers, comprising:
[0116] A gantry assembly comprising a gantry and a vertical support
and lift system including leg portions having ground engaging
portions adapted to be supported on first ground support
locations;
[0117] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system, including at least
one rail car;
[0118] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted for supporting the
weight of a bridge span and configured for conveying a bridge span
in a horizontal transport plane along at least a portion of the
length of the gantry, the gantry conveyance system adapted to
cooperate with a load-bearing ground conveyance system.
[0119] Embodiments of the systems as defined above will now be
summarized.
[0120] Optionally, the gantry conveyance system is adapted to
cooperate with a bridge span connection system, the gantry
conveyance system and bridge span connection system cooperating to
provide at least two separately locatable or independently
locatable suspension means for supporting the bridge span from two
positions on the bridge span proximal to the ends of the bridge
span.
[0121] The vertical support and lift system is adapted for
supporting a combined weight of the gantry and a bridge span in
operational vertical positions above the respective bridge span
support-surfaces of the piers including, the operational vertical
positions corresponding to the at least one horizontal transport
plane and a disembarking plane in which the leg portions are
extended (e.g. by controlling a power system operatively associated
with the vertical support and lift system) from a stowed position
on the pre-installation conveyance system to an extent sufficient
for the gantry assembly to self-liftoff the pre-installation
conveyance system onto the first ground support locations to effect
a gantry installation.
[0122] Optionally, the gantry assembly and/or the gantry conveyance
system define suspension means position limits that delimit a
maximum horizontal travel distance that the suspension means can
travel in the horizontal transport plane when supporting a load
comprising at least a portion of the weight of the bridge span.
[0123] Optionally, the ground conveyance system is adapted to be
transported on a path extending away from a ground position
adjacent to an edge of an existing bridge span, a suspension means
position limit and/or the path accommodating conveyance of the
bridge through at least a threshold horizontal conveyance distance
required tor transferring load support from the gantry conveyance
system to the ground conveyance system and/or from the ground
conveyance system to the gantry conveyance system.
[0124] Optionally, as described above, the vertical support and
lift system includes:
[0125] a load bearing first vertical support assembly (2)
operatively connected to the gantry proximal to a first end
thereof; and
[0126] a load-bearing second vertical support assembly operatively
connected to the gantry proximal to a second end thereof
[0127] each vertical support assembly including two leg portions
having a ground engaging portions and a gantry connection portion
for connecting the leg portions to the gantry, the vertical support
and lift system including or adapted to be operatively associated
with a power system and a control system to vary the linear
vertical distance between the ground engaging portion of a leg
portion and the gantry to control the vertical height of the
gantry.
[0128] Optionally, as described above, the gantry assembly and/or
the gantry conveyance system at least partially define bridge span
position limits that delimit a minimum horizontal transport
distance over which the bridge span can be conveyed with at least
partial load support from the gantry conveyance system, the minimum
horizontal transport distance extending beyond the first ground
locations.
[0129] Optionally, as described above, the gantry connection
portion includes an outrigger portion configured to laterally
distance at least one leg portion (preferably both) of at least one
vertical support assembly from lateral perimeters of the gantry,
whereby the outrigger portion is adapted to accommodate passage of
a bridge span, wider than the gantry, between the leg portions of
at least one vertical support assembly to accommodate transfer of
load support from the gantry conveyance system to the ground
conveyance system and/or from the ground conveyance system to the
gantry conveyance system.
[0130] Optionally, as described above, the at least one rail car of
the pre-installation conveyance system defines a conveyance system
footprint area including lateral perimeters, the gantry configured
to have a gantry footprint area having lateral perimeters which fit
within the lateral perimeters of the pre-installation conveyance
system, the outrigger portion adapted to position leg portions of
at least one vertical support assembly beyond the lateral
perimeters of the footprint area of the pre-installation conveyance
system, to clear the lateral perimeters of the pre-installation
conveyance system, when the gantry legs are lowered to effect a
gantry installation.
[0131] Optionally, as described above, the outrigger portion and
leg portions of at least vertical support assembly are regionally
mounted with respect to positionally-fixed portions of the gantry
connection portion, for movement about a vertical axis
perpendicular to the longitudinal axis of the gantry between a
stowed position in which the outrigger portion and leg portion are
rotated towards the gantry and a laterally extended installation
position.
[0132] Optionally, the lateral perimeters of the gantry assembly
footprint when the gantry assembly in supported on the
pre-installation conveyance system in the stowed position lie
within existing railway clearances for the delivering the gantry
assembly to or from a site of placement or removal of a bridge
span.
[0133] According to yet another aspect, the invention is directed
to a method of organizing installation or replacement of a train
bridge span of the type which spans and is supported by two piers
(25) of a train bridge, each pier having and a bridge span
support-surface (22), the method comprising:
[0134] using a pre-installation conveyance system including at
least one rail car to convey a gantry assembly, supported in a
horizontal position, into horizontal alignment with a plurality of
load-bearing first ground-support locations, wherein the gantry
assembly overlies an existing bridge span supporting a train track,
the pre-installation conveyance system defining a pre-installation
conveyance system footprint area having lateral perimeters;
[0135] the gantry assembly comprising a gantry and a
ground-engaging vertical support and lift system including leg
portions each having a ground engaging portion for supporting the
leg portions on respective first ground-support locations;
[0136] the gantry assembly adapted so be operatively associated
with a gantry conveyance system and a bridge span connection system
adapted for horizontally conveying a raised existing bridge span in
a horizontal transport plane relative to the gantry assembly over
distance sufficient to transfer a load corresponding to the weight
of the existing bridge span in at least one stage onto a support
portion of a ground conveyance system;
[0137] the vertical support and lift system adapted supporting a
combined weight of the gantry and a bridge span in at least one
operational vertical position above the respective bridge, span
support-surfaces of the piers, and extending the leg portions into
installed positions from stowed positions on the pre-installation
conveyance system, the at least one operational vertical position
including a position corresponding to:
[0138] the horizontal transport plane;
[0139] a pre-installation conveyance system disembarking plane, in
which the gantry legs are extendable to self-lift the gantry
assembly off the pre-installation conveyance system to effect a
gantry installation; and
[0140] controlling the vertical support and lift system to lift the
gantry assembly off the pre-installation conveyance system to
position the first and second vertical assemblies on the first
ground locations.
[0141] According to another embodiment of the method, the invention
is directed to a method of organizing installation or replacement
of a train bridge span of the type which spans and is supported by
two piers of a train bridge, the method comprising:
[0142] using a pre-installation conveyance system including at
least one rail car to convey a gantry assembly, supported in a
horizontal position, into horizontal alignment with a plurality of
load-bearing first ground-support locations;
[0143] the gantry assembly comprising a gantry and a
ground-engaging vertical support and lift system including leg
portions each having a ground engaging portion for supporting the
leg portions on respective first ground-support locations;
[0144] the gantry assembly adapted to be operatively associated
with a gantry conveyance system adapted for horizontally conveying
a bridge span in a horizontal transport plane relative to the
gantry assembly over distance sufficient to transfer a load
corresponding to the weight of the existing bridge span in at least
one stage onto a support portion of a ground conveyance system;
[0145] the vertical support and lift system adapted supporting a
combined weight of the gantry and a bridge span in at least one
operational vertical position above the respective bridge span
support-surfaces of the piers, the at least one position
corresponding to:
[0146] the horizontal transport plane;
[0147] a pre-installation conveyance system disembarking plane, in
which the gantry legs are extendable to self-lift the gantry
assembly off the pre-installation conveyance system to effect a
gantry installation;
[0148] Controlling the vertical support and lift system to lift the
gantry assembly off the pre-installation conveyance system to
position the first and second vertical assemblies on the first
ground locations.
[0149] According to another embodiment of the method, the invention
is directed to a method of organizing installation or replacement
of a train bridge span of the type which spans and is supported by
two piers of a train bridge, each pier having and a bridge span
support-surface, the method comprising:
[0150] using a pre-installation conveyance system (27) including at
least one rail car to convey a gantry assembly, supported in a
horizontal position, into horizontal alignment with a plurality of
load-bearing first ground-support locations;
[0151] the gantry assembly comprising a gantry and a
ground-engaging vertical support and lift system, the vertical
support and lift system operatively associated with a control
system and including leg portions, each leg portion having a ground
engaging portion for supporting the leg portions on respective
first ground-support locations;
[0152] the vertical support and lift system adapted to support the
gantry in at least one operational vertical position above the
respective bridge span support-surfaces of the piers, the at least
one portions corresponding to disembarking plane in which the leg
portions are extended by the control system from a stowed position
on the pre-installation conveyance system to an extent sufficient
for the gantry assembly to self-liftoff the pre-installation
conveyance system onto the first ground-support locations; and
[0153] controlling the vertical support and lift system such that
the gantry assembly self-lifts off the pre-installation conveyance
system onto the first ground support locations.
[0154] It is to be understood that the vertical support and lift
system is powered to lift a suitable load and that a control system
used for controlling the vertical support and lift system is at
least adapted to control the vertical height of the gantry.
[0155] According to another embodiment, a gantry assembly is
adapted to be operatively associated a gantry conveyance system
support by the gantry and a ground conveyance system, the ground
conveyance system including a support portion for supporting the
bridge span, the gantry conveyance system operatively associated
with a control system and a power system and adapted for conveying
a bridge span in a horizontal transport plane relative to the
gantry assembly over distance sufficient to transfer a load
corresponding to the weight of the bridge span from the gantry
conveyance system to the support portion of the ground conveyance
system from the support portion of the ground conveyance system to
the gantry conveyance system.
[0156] The gantry conveyance system including two conveyable
separately locatable bridge span support means e.g. a suspension
means, for supporting the bridge span, the gantry assembly and the
support means operatively associated with a lift system (e.g. a
winch), the lift system adapted for raising a bridge from the piers
into the horizontal transport plane and lowering a bridge span onto
the piers from a horizontal transport plane.
[0157] Additional embodiments of the methods are now
summarized.
[0158] Optionally, as described above, the ground engaging vertical
support and lift system comprises a first vertical support assembly
for supporting the gantry proximal to one end thereof and a second
vertical support assembly for supporting the gantry proximal to the
opposite end thereof, each vertical support assembly comprising leg
portions, a gantry connection portion for connecting a leg portion
to the gantry and a ground engaging portion for supporting a leg
portion on a first ground-support location, the vertical support
and lift system adapted to be operatively associated with a power
system and a control system, the vertical support and lift system,
power system and control system adapted for controlling the linear
vertical distance between the ground engaging portion of a leg
portion and the gantry so as control the vertical height of the
gantry.
[0159] Optionally, as described above, the distance between the
lateral perimeters of the pre-installation conveyance system is
wider that the width of the gantry, the gantry assembly configured
such that the ground-engaging portions of the leg portions are
suspended outside the lateral perimeters of the pre-installation
conveyance system footprint area in the stowed position so as to
provide lateral clearance for the ground engaging portions to be
extended into installation positions on the first ground-support
locations and for the pre-installation system to be removed from
above the existing bridge span.
[0160] Optionally, the method further comprises:
[0161] bringing a ground conveyance system into horizontal
alignment with load-bearing second ground-support locations in
which the ground conveyance system is positioned on a path defined
by a portion of a train track contiguous with the train track
overlying the existing bridge span, the gantry conveyance system
comprising a track and at least one vehicle conveyable on the
track, the at least one vehicle adapted to be operatively
associated with the bridge span connection system for suspending
the bride span rom the at least one vehicle beneath the gantry, the
gantry conveyance system and bridge span connection system adapted
for supporting the weight of a bridge span beneath the gantry for
conveyance in a substantially horizontal plane on the track along
at least a portion of the length of the gantry, the gantry assembly
and/or the gantry conveyance system defining a vehicle positon
limit that delimits a maximum horizontal travel; distance that the
at least one vehicle can travel in the horizontal transport plane
when supporting a load comprising at least a portion of the weight
of the existing bridge span, a vehicle position limit and/or the
path defining a threshold horizontal displacement distance which is
at least sufficient to transfer load support from the gantry
conveyance system to the ground conveyance system;
[0162] adjusting the height of the gantry, if and as necessary,
connecting the bridge span connection system between the bridge
span and the gantry conveyance system, such that the bridge span is
prepared to be suspended from the gantry conveyance system when the
gantry is lifted by the vertical support and lift system into the
at least one horizontal transport plane;
[0163] Controlling the vertical support and lift system to raise
train bridge span into the least one horizontal transport
plane;
[0164] Using the gantry conveyance system to convey the bridge span
into at least one load transferring position overlying the support
portion of the ground conveyance system, the load transferring
position adapted for transferring a load corresponding to the
weight of the bridge span from the gantry conveyance system to the
ground conveyance system; and
[0165] Transferring a load corresponding to the weight of the
bridge spun, from the gantry conveyance to the ground conveyance
system, the control system controllable to lower the existing
bridge span onto the support portion of the ground conveyance
system.
[0166] Optionally, the method further comprises:
[0167] Using the gantry conveyance system to convey the bridge span
towards a vehicle position limit into a load-transferring first
position overlying the ground conveyance system;
[0168] Transferring the load attributable to a forward end portion
of the bridge span to the ground conveyance system;
[0169] Using the ground conveyance system in combination with the
gantry conveyance system to convey the train bridge span beyond the
vehicle position limit to a load transferring second position in
winch the load attributable to a rearward end portion of the
existing bridge span is transferable to the ground conveyance
system; and
[0170] Transferring a load attributable to the rearward end-portion
of the existing bridge span to the ground conveyance system, such
that the existing bridge is removable from a site of replacement of
an existing bridge span.
[0171] Optionally, the method further comprises:
[0172] Using a second ground conveyance system to convey a
replacement bridge span into alignment with load bearing third
ground-support locations corresponding to portions of a train track
leading to the rearward pier in which at least a forward end the
replacement bridge span is positioned under the gantry conveyance
system;
[0173] Transferring lead attributable to at least a forward end
portion of the replacement train-bridge span to the gantry
conveyance system and a bridge span connection system;
[0174] Using the gantry conveyance system and the second ground
conveyance system to convey the replacement bridge span into
horizontal alignment with a third ground-support location in which
a rearward end portion of the replacement bridge span is positioned
under the gantry conveyance system and transferring a load
attributable to the rearward end portion of the replacement
train-bridge span to the gantry conveyance system and bridge span
connection system;
[0175] Using the gantry conveyance system and bridge span
connection system to convey the replacement bridge span into
horizontal alignment with bridge span support-surfaces of the first
and second piers;
[0176] Using the control system to lower the replacement bridge
span onto the bridge span support-surfaces of the first and second
piers.
[0177] Optionally, the method further comprises:
[0178] Removing the bridge span connection system from the
replacement bridge span.
[0179] Adjusting the height of the gantry, as necessary, conveying
a post-installation conveyance system including a support bed
configured to support the gantry installation under the gantry
installation and using the lift system to lift the ground engaging
portions of the vertical support system from the first
ground-support locations such that the weight of the gantry
installation is transferred onto the post-installation conveyance
system;
[0180] Transporting the gantry installation away the replacement
bridge span.
[0181] Optionally, the method is executed according to a schedule
that accommodates a scheduled maximum delay of train traffic across
the train bridge, the path at least sufficient of sufficient length
to convey the existing bridge span to a site for off-loading the
existing bridge span.
[0182] Optionally, a combined footprint of the pre-installation
conveyance system and gantry assembly supported thereon is
accommodated by an existing train route for bringing the gantry
assembly onto a gantry installation worksite including through or
via any train tunnel, train track or train station along the
existing train route.
[0183] Optionally, a combined footprint of the post-installation
conveyance system and gantry assembly supported thereon is
accommodated by an existing train route for bringing the gantry
assembly off a gantry installation worksite and optionally onto a
new gantry installation worksite including through or via any train
tunnel, train track or train station along the existing train
route.
[0184] Optionally, the pre-installation conveyance system comprises
a forward rail car which supports a forward end portion of the
gantry installation and a rearward rail car which supports a
rearward end of the gantry installation, and wherein the combined
footprint area of the rail cars is approximately 10 ft. wide by 130
ft. long.
[0185] Optionally, each vertical support assembly includes a gantry
connection portion and a pair of laterally separated leg portions
having ground-engaging portions adapted for supporting the gantry
on the ground at the load-bearing first ground-support locations,
the gantry connection portion preferably including an outrigger
portion configured to laterally displace the leg portions of the
vertical support assemblies from lateral perimeters of the gantry,
the lateral displacement accommodating passage of bridge span
between the leg portions of the first and second vertical support
assemblies when an a bridge span is transported into a load
transferring position, the outrigger portion preferably configured
to position the leg portions of a vertical support assembly
perpendicularly to the gantry outside at least the lateral
perimeters of the pre-installation conveyance system with the
ground engaging leg portions preferably overlying the first
ground-support locations such that the gantry assembly is adapted
to be installed when the gantry assembly is conveyed into
horizontal alignment with the first ground-support locations and
the fill system extends the leg portions thereby lowering the
ground engaging portions of the leg portions onto the first
ground-support locations to lift the gantry on the pre-installation
conveyance system, the at least one vertical position including a
vertical position of a height sufficient for the pre-installation
conveyance system to be moved under the gantry assembly.
[0186] Optionally, the bridge span connection system is a system of
one more straps operatively connected to the gantry conveyance
system, and adapted to suspend a bridge span beneath the gantry in
a horizontal orientation for transport in the at least one
horizontal transport plane, the at least one horizontal transport
plane having a lower limit optionally defined by a lower limit of
the transported bridge span or the bridge span support surface of
the ground conveyance system.
[0187] Optionally, the ground conveyance system is adapted to be
positioned on load-bearing second ground-support locations in the
vicinity of the bridge-span support surface of the first pier, the
ground conveyance system adapted to be driven on a path preferably
defined by a train track, the path defining a horizontal
displacement distance which extends the forward horizontal vehicle
position limit of the track system on one side of the gantry by a
distance sufficient to transfer full load support from the gantry
conveyance system to the ground conveyance system, the ground
conveyance system including a support portion for supporting the
weight of a bridge span, wherein the vertical support system and
lift system are adapted to raise the gantry to a height in winch
the lower limit of the first horizontal transport plane is above
and clears the support portion of the ground conveyance system,
such that the train bridge span can be conveyed by the gantry
conveyance system into horizontal alignment with a forward vehicle
position limit overlying a support surface of the ground conveyance
system, such that the bridge span can be received for support on
the support surface of the ground conveyance system for conveyance
through the horizontal displacement distance, optionally using the
lift system to lower the bridge span on the ground conveyance
system.
[0188] Optionally, the gantry conveyance system and bridge span
connection system are adapted to support the bridge span from
points of suspension on both sides of the gantry.
[0189] Optionally, the gantry conveyance system comprises two
separately locatable vehicles, each respective vehicle convey able
along the gantry to a respective horizontal vehicle position limit
and to a relative horizontal position limit defined by the relative
position of the vehicles on either end of the gantry, separation of
the vehicles towards the horizontal vehicle displacement limits
adapted to suspend the bridge span from both ends of the gantry,
each vehicle operatively connected to a spreader structure, the
spreader structure, oriented transversely with respect to the
longitudinal axis of the gantry for distancing two points of
suspension of the bridge span from the center of gravity of a
vehicle, the spreader structure thereby configured to suspend the
bridge span front two sides of the gantry.
[0190] Optionally, the bridge span connection system comprises
straps, each end of spreader structure displaced sufficiently from
center of gravity of the vehicle to define a line of sight between
a respective end of the spreader structure and a point of contact
or connection of the bridge span connection system to the bridge
span, each end of the spreader structure operatively associated
wish a connector for connecting a strap.
[0191] Optionally, the gantry conveyance system includes a
self-propelled forward vehicle and a self-propelled rearward
vehicle riding on the track system and wherein the ground
conveyance system comprises a forward rail car and a rearward rail
car, each rail car having a bridge span support bed, wherein in
operation:
[0192] the existing bridge span is raised into the at least one
horizontal transport plane by actuation of the vertical support and
lift system and transported in a horizontal plane by the forward
vehicle and rearward vehicle until the forward vehicle approaches a
forward vehicle position limit in which the existing bridge span is
positioned above the support bed of the forward rail car, and
wherein a portion of the load attributable to the forward end
portion of the existing badge span is then transferred onto the
forward rail car, preferably by using the lift system to lower the
gantry; and
[0193] wherein the existing train bridge span is then conveyed
toward a full ground support position with at least partial support
from the forward rail car supporting a forward end portion of the
bridge span and the rearward vehicle supporting a rearward end
portion of the bridge span until the rearward end portion of the
bridge span is positioned above the support bed of the rearward
rail car and wherein the load is then transferred onto a support
bed of the rearward rail car preferably by using the lift system to
lower the gantry.
[0194] Optionally, the second ground conveyance system includes a
forward rail car and rearward rail car, comprising:
[0195] Using the second ground conveyance system to convey a
replacement bridge spun into alignment with load bearing third
ground-support locations in which a forward end the replacement
bridge span is positioned under the forward vehicle;
[0196] Transferring a load corresponding to a forward end portion
of the replacement bridge span to the forward vehicle and a bridge
span connection system;
[0197] Using the gantry conveyance system and the second ground
conveyance system to convey the replacement bridge span into
horizontal alignment with a third ground-support location in which
a rearward end portion of the replacement bridge span is positioned
under the rearward vehicle and transferring a load attributable to
the rearward end portion of the replacement train-bridge span to
the rearward vehicle and bridge span connection system;
[0198] Using the gantry conveyance system and bridge span
connection system to convey the replacement bridge span into
horizontal alignment with bridge span support-surfaces of the first
and second piers;
[0199] Using the lift system to lower the replacement bridge span
onto the bridge span support-surfaces of the first and second
piers.
[0200] Optionally, the method further comprises:
[0201] Removing the bridge span connection system from the
replacement bridge span;
[0202] Adjusting the height of the gantry as necessary, conveying a
post-installation conveyance system including a support bed
configured to support the gantry installation under the gantry
installation and using the lift system to lift the ground engaging
portions of the vertical support system from the first
ground-support locations such that the weight of the gantry
installation is transferred onto the post-installation conveyance
system.
[0203] Optionally, the lift system is a hydraulic jack system
wherein the leg portions of the first and second vertical support
assemblies are hydraulic legs.
[0204] A method of organizing installation or replacement of a
train bridge span of the type which spans and is supported by two
piers (25) of a train bridge, each pier having and a bridge span
support-surface (22), the method comprising:
[0205] using a pre-installation conveyance system (27) including at
least one rail car to convey a gantry assembly, supported in a
horizontal position, into horizontal alignment with a plurality of
load-bearing first ground-support locations;
[0206] the gantry assembly comprising a gantry and a
ground-engaging vertical support and lift system, the vertical
support and lift system operatively associated with a control
system and including leg portions, each leg portion having a ground
engaging portion for supporting the leg portions on respective
first ground-support locations;
[0207] the vertical support and lift system adapted to support the
gantry in at least one operational vertical position above the
respective bridge span support-surfaces of the piers, the at least
one position corresponding to disembarking plane in which the leg
portions are extended by the control system from a stowed position
on the pre-installation conveyance system to an extent sufficient
for the gantry assembly to self-liftoff the pre-installation
conveyance system onto the first ground-support locations; and
[0208] controlling the vertical support and lift system such that
the gantry assembly self-lifts off the pre-installation conveyance
system onto the first ground support locations.
[0209] Optionally, the gantry assembly is adapted to be operatively
associated with a gantry conveyance system supported by the gantry
and a ground conveyance system, the ground conveyance system
including a support portion for supporting the bridge span, the
gantry conveyance system operatively associated with a control
system and a power system and adapted for conveying a bridge span
in a horizontal transport plane relative to the gantry assembly
over distance sufficient to transfer a load corresponding to the
weight of the bridge span from the gantry conveyance system to the
support portion of the ground conveyance system from the support
portion of the ground conveyance system to the gantry conveyance
system, the gantry conveyance system including two conveyable
separately locatable suspension means for supporting the bridge
span, the gantry assembly and the support means operatively
associated with a lift system, the lift system adapted for raising
a bridge from the piers into the horizontal transport plane and
lowering a bridge span onto the piers from a horizontal transport
plane.
[0210] Optionally the method is executed to a schedule that
accommodates a scheduled maximum delay of train traffic across the
train bridge, the path at least sufficient of sufficient length to
convey the existing bridge span to a site for off-loading the
existing bridge span.
[0211] Optionally, the combined footprint of the pre-installation
conveyance system and gantry assembly supported thereon is
accommodated by an existing train route for bringing the gantry
assembly onto a gantry installation worksite including through or
via any train tunnel, train track or train station along the
existing train route.
[0212] Optionally, a combined footprint of the post-installation
conveyance system and gantry assembly supported thereon is
accommodated by an existing train route for bringing the gantry
assembly off a gantry installation worksite and optionally onto a
new gantry installation worksite including through or via any train
tunnel, train track or train station along the existing train
route.
[0213] Optionally, the pre-installation conveyance system comprises
a forward rail car which supports a forward end portion of the
gantry installation and a rearward rail car which supports a
rearward end of the gantry installation. Optionally, the combined
footprint area of the rail cars is approximately 5 to 10 ft. wide
by 130 ft. long.
[0214] Optionally, as described above, each vertical support
assembly includes a gantry connection portion and a pair of
laterally separated leg portions having ground-engaging portions
adapted for supporting the gantry on the ground at the load-bearing
first ground-support locations, the gantry connection portion
preferably including an outrigger portion configured to laterally
displace the leg portions of the vertical support assemblies from
lateral perimeters of the gantry, the lateral displacement
accommodating passage of bridge span between the leg portions of
the first and second vertical support assemblies when an a bridge
span is transported into a load transferring position, the
outrigger portion preferably configured to position the leg
portions of a vertical support assembly perpendicularly to the
gantry outside at least the lateral perimeters of the
pre-installation conveyance system with the ground engaging leg
portions preferably overlying the first ground-support locations
such that the gantry assembly is adapted to be installed when the
gantry assembly is conveyed into horizontal alignment with the
first ground-support locations and the lift system extends the leg
portions thereby lowering the ground engaging portions of the leg
portions onto the first ground-support locations to lift the gantry
off the pre-installation conveyance system, the vertical positions
including a vertical position of a height sufficient for the
pre-installation conveyance system to be removed from or
re-positioned from original support locations beneath the gantry
assembly.
[0215] Optionally, as described above, the bride span connection is
a system of one more straps operatively connected to the gantry
conveyance system, and adapted to suspend a bridge span beneath the
gantry in a horizontal orientation for transport in the at least
one horizontal transport plane, the at least one horizontal
transport plane having a lower limit optionally defined by a lower
limit of the transported bridge span or the bridge span support
surface of the ground conveyance system.
[0216] Optionally as described above, the ground conveyance system
is adapted to be positioned on load-bearing second ground-support
locations in the vicinity of the bride-span support surface of the
first pier, the ground conveyance system adapted to be driven on a
path preferably defined by a train track, the path defining a
horizontal displacement distance which extends the forward
horizontal vehicle position limit of the back system on one side of
the gantry by a distance sufficient to transfer full load support
from the gantry conveyance system to the ground conveyance system,
the ground conveyance system including a support portion for
supporting the weight of a bridge span, wherein the vertical
support system and lift system are adapted to raise the gantry to a
height in which the lower limit of the first horizontal transport
plane is above and clears the support portion of the ground
conveyance system, such that the train bridge span can be conveyed
by the gantry conveyance system into horizontal alignment with a
forward vehicle position limit overlying a support surface of the
ground conveyance system, such that the bridge span can be received
for support on the support surface of the ground conveyance system
for conveyance through the horizontal displacement distance,
optionally using the lift system to lower the bridge span on the
ground conveyance system.
[0217] Optionally, the gantry conveyance system and bridge span
connection system are adapted to support the bridge span from
points of suspension on both sides of the gantry.
[0218] Optionally, the gantry conveyance system comprises two
separately locatable vehicles, each respective vehicle conveyable
along the gantry to a respective horizontal vehicle position limit
and to a relative horizontal position limit defined by the relative
position of the vehicles on either end of the gantry, separation of
the vehicles towards the horizontal vehicle displacement limits
adapted to suspend the bridge span from both ends of the gantry,
each vehicle operatively connected to a spreader structure, the
spreader structure, oriented transversely with respect to the
longitudinal axis of the gantry for distancing two points of
suspension of the bridge span from the center of gravity of a
vehicle, the spreader structure thereby configured to suspend the
bridge span from two sales of the gantry.
[0219] Optionally, the bridge spars connection system comprises
straps, each end of spreader structure displaced sufficiently from
center of gravity of the vehicle to define a line of sight between
a respective end of the spreader structure and a point of contact
or connection of the bridge span connection system to the bridge
span, each end of the spreader structure operatively associated
wish a connector for connecting a strap.
[0220] Optionally, the gantry conveyance system includes a
hydraulically powered forward vehicle and a hydraulically powered
rearward vehicle riding on the track system and wherein the ground
conveyance system comprises a forward rail car and a rearward rail
car, each rail car having a bridge span support bed, wherein in
operation:
[0221] the existing bridge span is raised into the at least one
horizontal transport plane by actuation of the vertical support and
lift system and transported in a horizontal plane by the forward
vehicle and rearward vehicle until the forward vehicle approaches a
forward vehicle position limit in which the existing bridge span is
positioned above the support bed of the forward rail car, and
wherein a portion of the load attributable to the forward end
portion of the existing bridge span is then transferred onto the
forward rail car, preferably by using the vertical support and lift
system to lower the gantry; and
[0222] wherein the existing train bridge span is then conveyed
toward a full ground support position with at least partial support
from the forward rail car supporting a forward end portion of the
bridge span and the rearward vehicle supporting a rearward end
portion of the bridge span until the rearward end portion of the
bridge span is positioned above the support bed of the rearward
rail car and wherein the load is then transferred onto a support
bed of the rearward rail car preferably by using the lift system to
lower the gantry.
[0223] Optionally, the second ground conveyance system includes a
forward rail car and rearward rail car, comprising:
[0224] Using the second ground conveyance system to convey a
replacement bridge span into alignment with load bearing third
ground-support locations in which a forward end the replacement
bridge span is positioned under the forward vehicle;
[0225] Transferring a load corresponding to a forward end portion
of the replacement bridge span to the forward vehicle and a bridge
span connection system;
[0226] Using the gantry conveyance system and the second ground
conveyance system to convey the replacement bridge span into
horizontal alignment with a third ground-support location in which
a rearward end portion of the replacement bridge span is positioned
under the rearward vehicle and transferring a load attributable to
the rearward end portion of the replacement train-bridge span to
the rearward vehicle and bridge span connection system;
[0227] Using the gantry conveyance system and bridge span
connection system to convey the replacement bridge span into
horizontal alignment with bridge span support-surfaces of the first
and second piers; and
[0228] Using the vertical support and lift system to lower the
replacement bridge span onto the bridge span support-surfaces of
the first and second piers.
[0229] According to one embodiment, a system for removal or
placement of a train bridge-span of the type which spans and is
supported by two piers, is characterized in that it comprises;
[0230] A lift system;
[0231] A gantry assembly comprising a gantry and a vertical support
system for supporting the gantry, the gantry assembly adapted to be
transported in a horizontal position to a site for placement or
removal of a bridge span by a pre-installation conveyance system
including at least one rail car;
[0232] The gantry assembly adapted to be operatively associated
with the lift system, the lift system adapted to raise the bridge
span from the piers into a horizontal transport plane and to lower
a bridge span from a horizontal transport plane on the piers;
[0233] the vertical support system including leg portions having
ground engaging portions adapted to be supported on first ground
support locations;
[0234] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted to cooperate with a
load-bearing ground conveyance system including a support portion
for supporting the bridge span, the gantry conveyance system
operatively associated with a bridge span support system which
provides at least two points of support for supporting a bridge
span from two respective positions on a bridge span proximal to the
end portions of the bridge span;
[0235] the gantry conveyance system adapted for horizontally
conveying a bridge span in a horizontal transport plane relative to
the gantry assembly over distance sufficient to transfer a load
corresponding to the weight of a bridge span, in stages onto the
support portion of a ground conveyance system;
[0236] the vertical support system and lift system adapted for
supporting a bridge span from the first ground-support locations in
at least one operational vertical position above the respective
bridge span support-surfaces of the piers, the at least one
operational vertical position corresponding to at least one
horizontal transport plane and to a disembarking plane in which the
leg portions are expendable from a stowed position on the
pre-installation conveyance system to an extent sufficient for the
gantry assembly to self-liftoff the pre-installation conveyance
system onto the first ground support locations.
[0237] Optionally, the bridge span support system is a bridge span
suspension system. Optionally, the bridge span suspension system
comprises load bearing straps attached between the gantry
conveyance system and the bridge span.
[0238] The bridge span support system is a two point support system
supporting the bridge span in relation to gantry conveyance system
to enable to bridge span to carried by the gantry conveyance system
both independently and together with the ground conveyance
system.
[0239] According to yet another aspect the invention is directed to
the use of a gantry assembly installation to remove and install a
bridge span, for example in accordance with any method or steps of
a method herein defined or together with any system or any parts of
a system as herein defined.
[0240] According to yet another aspect the invention is directed to
the use of a gantry assembly to remove and install a bridge span,
for example in accordance with any method or steps of a method
herein defined or together with any system or any parts of a system
as herein defined.
[0241] According to yet another aspect the invention is directed to
the use of a system as herein defined to remove and install a
bridge span, for example in accordance with any method or steps of
a method herein defined.
Other Embodiments
[0242] A vertically-adjustable gantry assembly installation adapted
for removal or placement of a train bridge-span of the type which
spans and is supported by two piers, comprising:
[0243] A gantry assembly positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the gantry
assembly adapted to operatively associated with a gantry conveyance
system;
[0244] the vertical support and lift system adapted tor supporting
a combined weight of the gantry and a bridge span in at least one
operational vertical position above respective bridge span
support-surfaces of the piers including a position corresponding to
a disembarking plane in which the leg portions are extended from a
stowed position to an extent sufficient for the gantry assembly to
self-liftoff the pre-installation conveyance system onto the first
ground-support locations to effect the gantry assembly
installation.
[0245] A vertically-adjustable gantry assembly installation adapted
for removal or placement of a train bridge-span of the type which
spans and is supported by two piers, comprising:
[0246] A gantry assembly positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the gantry
assembly adapted to operatively associated with a gantry conveyance
system adapted to support the weight of the bridge span and a
ground conveyance system.
[0247] the vertical support and lift system including leg portions
having ground engaging portions and a gantry connection portion
including an outrigger portion, the vertical support and lift
system adapted for supporting a combined weight of the gantry and a
bridge span in at least one operational vertical position above
respective bridge span support-surfaces of the piers including a
position corresponding to a horizontal transport plane in which the
bridge span is conveyed by the gantry conveyance system along at
least a portion of gantry.
[0248] A vertically-adjustable gantry assembly installation adapted
for removal or placement of a train bridge-span of the type which
spans and is supported by two piers, comprising:
[0249] A gantry assembly positioned on load-bearing first
ground-support locations, the gantry assembly comprising a gantry
and a ground-engaging vertical support and lift system, the gantry
assembly adapted to operatively associated with a gantry conveyance
system and a ground conveyance system;
[0250] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span in at least one
operational vertical position above respective bridge span
support-surfaces of the piers including a position corresponding to
a disembarking plane in which the gantry assembly is adapted to
self-liftoff the pre-installation conveyance system onto the first
ground-support locations to effect the gantry assembly
installation, the vertical support and lift system including leg
portions, the leg portions including ground engaging portions, the
ground engaging portions including overhang portions of a ground
support structure, the leg portions operatively associated with an
alignment system for aligning the overhang portions with
ground-support portions of the ground support structure.
[0251] A gantry assembly for removal or placement of a tram
bridge-span of the type which spans and is supported by two piers,
comprising:
[0252] A gantry;
[0253] A ground-engaging vertical support and lift system;
[0254] the vertical support and lift system including:
[0255] a load bearing first vertical support assembly operatively
connected to the gantry proximal to a first end thereof; and
[0256] a load-bearing second vertical support assembly operatively
connected to the gantry proximal to a second end thereof;
[0257] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted to be operatively
associated with a bridge span support system for supporting the
bridge span from at least two positions on the bridge span proximal
to the ends of the bridge span;
[0258] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span in at least one
operational vertical position above the respective bridge span
support-surfaces of the piers including at least one position
corresponding to a horizontal transport plane.
[0259] Optionally, each vertical support assembly includes at least
one leg portion having a ground engaging portion and a gantry
connection portion for connecting the leg portions to the gantry,
the gantry connection portion including an outrigger portion, the
vertical support and lift system including or adapted to be
operatively associated with a power system and a control system to
vary the linear vertical distance between the ground engaging
portion of a leg portion and the gantry to control the vertical
height of the gantry.
[0260] Optionally, the at least one vertical position includes a
position corresponding to a pre-installation conveyance system
disembarking plane.
[0261] Optionally, the vertical support and lift system is adapted
to be operatively associated with an alignment system for aligning
the ground engaging portions of the leg portions with the first
ground support locations.
[0262] A gantry assembly for removal or placement of a train
bridge-span of the type which spans and is supported by two piers,
comprising:
[0263] A gantry;
[0264] A ground-engaging vertical support and lift system;
[0265] the gantry assembly configured to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system including at least one
rail car;
[0266] the vertical support and lift system including:
[0267] a load bearing first vertical support assembly operatively
connected to the gantry proximal to a first end thereof; and
[0268] a load-bearing second vertical support assembly operatively
connected to the gantry proximal to a second end thereof;
[0269] each vertical support assembly including at least one leg
portion having a ground engaging portion and a gantry connection
portion for connecting the leg portions to the gantry, the vertical
support and lift system adapted for supporting a combined weight of
the gantry and a bridge span from first ground-support locations in
at least one operational vertical position above the respective
bride span support-surfaces of the pier, at least one position
corresponding to a disembarking plane in which the leg portions are
extendable to an extent at least sufficient for the gantry assembly
to self-liftoff the pre-installation conveyance system onto the
first ground-support locations.
[0270] A system for removal or placement of a train bridge-span of
the type which spans and is supported by two piers, comprising:
[0271] A gantry assembly comprising a gantry and a ground-engaging
vertical support and lift system, the gantry assembly adapted to be
transported in a horizontal position to a site for placement or
removal of a bridge span by a pre-installation conveyance system
including at least one rail car;
[0272] the vertical support and lift system including:
[0273] a load bearing first vertical support assembly operatively
connected to the gantry proximal to a first end thereof; and
[0274] a load-bearing second vertical support assembly operatively
connected to the gantry proximal to a second end thereof,
[0275] each vertical support assembly including at least one leg
portion having a ground engaging portion and a gantry connection
portion for connecting the leg portions to the gantry, the vertical
support and lift system including or adapted to be operatively
associated with a power system and a control system to vary the
linear vertical distance between the ground engaging portion of a
leg portion and the gantry to control the vertical height of the
gantry, the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span in operational
vertical positions above the respective bridge span
support-surfaces of the piers including at least one position
corresponding to a horizontal transport plane, and a position
corresponding to a disembarking plane in which the leg portions are
extended by the power system from a stowed position on the
pre-installation conveyance system to an extent at least sufficient
for the gantry assembly to self-liftoff the pre-installation
conveyance system onto the first ground locations such that the
pre-installation conveyance system can be removed from above the
existing bridge span beneath the gantry assembly to effect a gantry
installation;
[0276] a gantry conveyance system, supported by the gantry, adapted
to independently support the weight of a bridge span, and
configured for conveying a bridge span in a substantially
horizontal plane along at least a portion of the length of the
gantry (100), movement of bridge span relative to the gantry via
the gantry conveyance system (10) defining the horizontal transport
plane, the gantry conveyance system adapted to be operatively
associated with a bridge span connection system for suspending the
bridge span from the at least one vehicle beneath the gantry for
conveyance in the horizontal transport plane, wherein the gantry
conveyance system and bridge span connection system are configured
to provide conveyable suspension means for suspending the bridge
span beneath the gantry from two positions on the bridge span
proximal to the end portions of the bridge span;
[0277] the gantry assembly and/or the gantry conveyance system
defining suspension means position limits that delimit a maximum
horizontal travel distance that the suspension means can travel in
the horizontal transport plane when supporting a load comprising at
least a portion of the weight of the bridge span;
[0278] a load-bearing ground conveyance system including a support
portion for supporting a load comprising the weight of a bridge
span, the ground conveyance system adapted to be transported on a
path extending away from a portion of train rail terminating at the
bridge span, a suspension means position limit and/or the path
accommodating conveyance of the bridge through at least a threshold
horizontal conveyance distance required for transferring load
support from the gantry conveyance system to the ground conveyance
system and/or from the ground conveyance system to the gantry
conveyance system.
[0279] Optionally, the vertical support and lift system is adapted
to be operatively associated with an alignment system for aligning
the ground engaging portions of the leg portions with the first
ground support locations.
[0280] Optionally, the ground engaging portion of the leg portions
include overhang portions of a ground support structure, the
alignment system adapted to vertically align the overhang portions
with ground-support portions of the ground support structure.
[0281] Optionally, wherein the ground support structure is a beam,
optionally a tie beam.
[0282] A system for removal or placement of a train bridge-span of
the type which spans and is supported by two piers, comprising:
[0283] A gantry assembly comprising a gantry and a vertical support
and lift system including leg portions having ground engaging
portions adapted to be supported on first ground support
locations;
[0284] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system (27) including at
least one rail car;
[0285] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted to cooperate with a
load-bearing ground conveyance system, the gantry conveyance system
including support portions adapted to provide at least two points
of support for supporting the bridge span from two positions on the
bridge span proximal to the ends of the bridge span;
[0286] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span from first
ground-support locations in at least one operational vertical
position above the respective bridge span support-surfaces of the
piers at least one operational vertical position corresponding to
position(s) including at least one horizontal transport plane and a
disembarking plane in which the leg portions are extendable from a
stowed position on the pre-installation conveyance system to an
extent sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground support
locations to effect a gantry installation.
[0287] Optionally, the gantry assembly and/or the gantry conveyance
system define bridge span position limits that delimit a maximum
horizontal travel distance that the bridge span can be conveyed in
the horizontal transport plane when supported by the gantry
conveyance system;
[0288] the ground conveyance system adapted to be transported on a
path extending away from a ground position adjacent to an edge of
an existing bridge span, a bridge span position limit and/or the
path accommodating conveyance of the bridge through at least a
threshold horizontal conveyance distances required for transferring
load support from the gantry conveyance system to the ground
conveyance system and/or from the ground conveyance system to the
gantry conveyance system.
[0289] A system for removal or placement of a train bridge-span of
the type which spans and is supported by two piers, comprising:
[0290] A gantry assembly comprising a gantry and a vertical support
and lift system including leg portions having ground engaging
portions adapted to be supported on first ground support
locations;
[0291] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system including at least one
rail car;
[0292] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted for horizontally
conveying a bridge span in a horizontal transport plane relative to
the gantry assembly over distance sufficient to transfer a load
corresponding to the weight of the bridge span in stages onto a
support portion of a ground conveyance system, the gantry
conveyance system including a support portion adapted to provide
support for supporting the bridge span from two positions on the
bridge span, the positions proximal to the respective ends of the
bridge span;
[0293] the vertical support and lift system adapted tor supporting
the gantry from first ground-support locations in at least one
operational vertical position above the respective bridge span
support-surfaces of the piers at least one operational vertical
position corresponding to position(s) including a disembarking
plane in which the leg portions are extendable from a stowed
position on the pre-installation conveyance system to an extent
sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground support
locations.
[0294] Optionally, wherein the vertical support and lift system is
adapted for supporting the gantry in the horizontal transport
plane.
[0295] Optionally, the gantry assembly and the support portion are
operatively associated with a lift system, the lift system adapted
for raising a bridge from the piers into the horizontal transport
plane and lowering a bridge span onto the piers from a horizontal
transport plane.
[0296] Optionally, the gantry conveyance system is adapted for
horizontally conveying a bridge span in a horizontal transport
plane relative to the gantry assembly over distance sufficient to
transfer a load corresponding to the weight of the bridge span in
stages from a support portion of a ground conveyance system to the
gantry conveyance system.
[0297] A system for removal or placement of a train bridge-span of
the type which spans and is supported by two piers, comprising:
[0298] A gantry assembly comprising a gantry, a vertical support
system and a lift system, the rift system adapted to raise the
bridge span from the piers into a horizontal transport plane and to
lower a bridge span from a horizontal transport plane onto the
piers, the vertical support system including leg portions having
ground engaging portions adapted to be supported on first ground
support locations;
[0299] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system including at least one
rail car;
[0300] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted to cooperate with a
load-bearing ground conveyance system including a support portion
for supporting the bridge span, the gantry conveyance system
operatively associated with a bridge span support system adapted to
provide at least two points of support for supporting a bridge span
from two positions on the bridge span proximal to the end portions
of a bridge span;
[0301] the gantry conveyance system adapted for horizontally
conveying a bridge span in a horizontal transport plane relative to
the gantry assembly over distance sufficient to transfer a load
corresponding to the weight of a bridge span, in stages onto the
support portion of a ground conveyance system;
[0302] the vertical support system and lift system adapted for
supporting a bridge span from the first ground-support locations in
at least one operational vertical position above the respective
bridge span support-surfaces of the piers, the at least one
operational vertical position corresponding to at least one
horizontal transport plane and to a disembarking plane in which the
leg portions are extendable from a stowed position on the
pre-installation conveyance system to an extent sufficient for the
gantry assembly to self-liftoff the pre-installation conveyance
system onto the first ground support locations.
[0303] Optionally, the bridge span support system is a bridge span
suspension system.
[0304] Optionally, the bridge span system comprises load bearing
straps attached between the gantry conveyance system and the bridge
span.
[0305] A method of organizing installation or replacement of a
train bridge span of the type which spans and is supported by two
piers of a train bridge, the method comprising:
[0306] using a pre-installation conveyance system including at
least one rail car to convey a gantry assembly, supported in a
horizontal position, into horizontal alignment with a plurality of
load-bearing first ground-support locations;
[0307] the gantry assembly comprising a gantry and a
ground-engaging vertical support and lift system including leg
portions each having a ground engaging portion for supporting the
leg portions on respective first ground-support locations;
[0308] the gantry assembly adapted to be operatively associated
with a gantry conveyance system adapted for horizontally conveying
a bridge span in a horizontal transport plane relative to the
gantry assembly over distance sufficient to transfer a load
corresponding to the weight of the bridge span in stages onto a
support portion of as ground conveyance system;
[0309] the vertical support and lift system adapted supporting a
combined weight of the gantry and a bridge span in at least one
operational vertical position above the respective bridge span
support-surfaces of the piers, the at least one position
corresponding to:
[0310] the horizontal transport plane;
[0311] a disembarking plane, in which the gantry legs are
extendable to self-lift the gantry assembly off the
pre-installation conveyance system to effect a gantry
installation;
[0312] Controlling the vertical support and lift system to loft the
gantry assembly off the pre-installation conveyance system to
position the first and second vertical assemblies onto the first
ground-support locations.
[0313] A system for removal or placement of a train bridge-span of
the type which spans and is supported by two piers, comprising:
[0314] A gantry assembly comprising a gantry and a vertical support
and lift system including leg portions having ground engaging
portions adapted to be supported on first ground support
locations;
[0315] the gantry assembly adapted to be transported in a
horizontal position to a site for placement or removal of a bridge
span by a pre-installation conveyance system (27) including at
least one rail car;
[0316] the gantry assembly adapted to support a gantry conveyance
system, the gantry conveyance system adapted to cooperate with a
load-bearing ground conveyance system, the gantry conveyance system
including support portions adapted to provide at least two points
of support for supporting the bridge span from two positions on the
bridge span proximal to the ends of the bridge span;
[0317] the vertical support and lift system adapted for supporting
a combined weight of the gantry and a bridge span from first
ground-support locations in at least one operational vertical
position above the respective bridge span support-surfaces of the
piers at least one operational vertical position corresponding to
position(s) including at least one horizontal transport plane, and
a disembarking plane in which the leg portions are extendable from
a stowed position on the pre-installation conveyance system to an
extent sufficient for the gantry assembly to self-liftoff the
pre-installation conveyance system onto the first ground support
locations to effect a gantry installation.
[0318] Optionally, the gantry assembly and/or the gantry conveyance
system define bridge span position limits that delimit a maximum
horizontal travel distance that the bridge span can be conveyed in
the horizontal transport plane when supported by the gantry
conveyance system;
[0319] the ground conveyance system adapted to be transported on a
path extending away from a ground position adjacent to an edge of
an existing bridge span, a bridge span position limit and/or the
path accommodating conveyance of the bridge through at least a
threshold horizontal conveyance distance requited for transferring
load support from the gantry conveyance system to the ground
conveyance system and/or from the ground conveyance system to the
gantry conveyance system.
BRIEF DESCRIPTION OF THE DRAWINGS
[0320] The present invention will now be described by way of
example only with reference to the attached drawings, in which:
[0321] FIG. 1A is a perspective view of a gantry assembly
installation according to one embodiment of the invention;
[0322] FIG. 1B is an enlarged view of one end of the gantry
assembly installation shown in FIG. 1A showing hydraulic power
units and a remote control system, and illustrating that the
control system is controlling the height of the legs, and movement
of the vehicles belonging to the gantry conveyance system.
[0323] FIG. 2 is a side elevation view of an embodiment of a gantry
assembly including a gantry and a vertical support and lift system,
supported on a pre-installation conveyance system in accordance
with one embodiment of the invention;
[0324] FIG. 3 including FIGS. 3A-3H is a set of diagrammatic
representation of a system according to one embodiment of the
invention showing side elevations of a gantry assembly installation
in use in various stages of removal and installation of a bridge
span, as follows:
[0325] FIG. 3A is a simplified view a gantry assembly installation
in which the gantry is in an initial lowered position, with
opposing ends of an existing bridge span strapped to independently
locatable vehicles belonging to a gantry conveyance system;
[0326] FIG. 3B shows the gantry raised, with the existing bridge
span strapped to independently locatable vehicles belonging to the
gantry conveyance system;
[0327] FIG. 3C shows the existing bridge span having been moved
forward by two vehicles belonging to the gantry conveyance system
to a load-transferring position, in which the forward end portion
of the bridge span is shown overlying both the rearward and the
forward rail car of a ground conveyance system;
[0328] FIG. 3D shows an existing bridge span having moved forward
into a full ground-support position with cooperative load support
by the forward rail car and the rearward vehicle;
[0329] FIG. 3E shows a replacement bridge span brought onto third
ground-support locations at the gantry assembly installation site
by the two rail cars belonging to a second ground conveyance
system, the two vehicles belonging to the gantry conveyance system
positioned proximal to the rearward end of the gantry, the
replacement bridge span being positioned in a load transferring
position underneath the forward vehicle of the gantry conveyance
system;
[0330] FIG. 3F shows a replacement bridge span in a
load-transferring position adapted for full-gantry-support with the
forward end of the replacement bridge span suspended by the forward
vehicle of the gantry conveyance system and rearward end of the
replacement bridge span lying underneath the rearward vehicle of
the gantry conveyance system;
[0331] FIG. 3G shows the gantry raised into a vertically elevated
horizontal transport plane, with the replacement bridge suspended
via the bridge span connection system by the forward and rearward
vehicles of the gantry conveyance system, the forward and rearward
vehicles having conveyed the replacement bridge span into
horizontal alignment with the bridge span support surfaces of the
piers;
[0332] FIG. 3H shows the gantry lowered, with the replacement
bridge span seated on the bridge span support surfaces of the
piers;
[0333] FIG. 4A is a schematic representation of one end of a gantry
assembly representing a top elevation view of the gantry assembly
with the outrigger portions of a vertical support assembly in an
installation position;
[0334] FIG. 4B is a schematic representation of the end of a gantry
assembly representing a top elevation view of the gantry assembly
with the outrigger and leg portions of a vertical support assembly
in a stowed position.
[0335] FIG. 5A is an elevation view of the end of a gantry assembly
when supported on a rail car of a pre -installation conveyance
system showing the outrigger and leg portions of a vertical support
assembly in a stowed position;
[0336] FIG. 5B is a view of the gantry assembly of FIG. 5A, showing
the outrigger and leg portions of the vertical support assembly in
an installation position.
[0337] FIG. 5C is an elevation view of an end of a gantry assembly
when lifted off a rail car of a pre-installation conveyance system,
with the outrigger and leg portions of a vertical support assembly
shown in an installation position and showing the legs extended to
enable removal of the pre-installation conveyance system from
beneath the gantry assembly.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
[0338] The invention will now be further described with reference
to the drawings.
[0339] Gantry Assembly
[0340] As shown in FIG. 1A, a gantry assembly 1 for removal or
placement of a train bridge-span of the type which spans and is
supported by two piers comprises a gantry 100 and a ground-engaging
vertical support and lift system.
[0341] As shown in FIG. 2, the gentry assembly 1 is configured to
be transported in a horizontal position to a site for placement or
removal of a bridge span by a pre-installation conveyance system 27
including at least one rail car 28.
[0342] The vertical support and lift system includes a load bearing
first vertical support assembly 2 operatively connected to the
gantry 100 proximal to a first end thereof and a load-bearing
second vertical support assembly 29 operatively connected to the
gantry 100 proximal to a second end thereof.
[0343] As best seen in FIG. 5A-5C, each vertical support assembly
includes two leg portions 20 having a ground engaging portion in
the form of foot portion 49 and a gantry connection portion 500 for
connecting the leg portions 20 to the gantry 100, the gantry
connection portion 500 including an outrigger portion 11 consisting
of rotatable portions 11A and 11B, the vertical support and lift
system including or adapted to be operatively associated with a
power system (see FIG. 1B e.g. a hydraulic power system), and a
control system, to vary the linear vertical distance between the
ground engaging portion 49 of a leg portion 20 and the gantry 100
to control the vertical height of the gantry 100. The vertical
support and lift system is adapted for supporting a combined weight
of the gantry and a bridge span in an operational vertical
positions above the respective bridge span support-surfaces of the
piers including at least one position corresponding to a horizontal
transport plane.
[0344] As best seen in FIGS. 4A, 4B, 5A and 5B, the outrigger
portion 11 (portions 11A and 11B) of a gantry connection portion
500 together with the leg portions 20 of a vertical support
assembly are rotationally mounted with respect so a
positionally-fixed portion 600 of the gantry connection portion
500, for movement about a vertical axis perpendicular to the
longitudinal axis of the gantry between a stowed position (FIG. 4B)
in which the outrigger portion and leg portion are rotated towards
the gantry and a laterally extended `installation position`
illustrated in FIG. 4A. In the `stowed position` (4B) a connection
interface of the outrigger portion 11, in the form of a flush plate
610, is securely fastened, for example using a plurality of bolts,
to a corresponding interface of the positionally-fixed portion 600
of the gantry connection portion 500, in the form of mating flush
plate 615, to prevent rotation and accommodate full load support in
the installation position. As best seen in FIGS. 4A and 4B, a left
side 11A and a right side 11B of the outrigger portion 11 are
independently hingedly-mounted via hinges 612 to a
positionally-fixed portion 600 of the gantry connection portion
500.
[0345] System
[0346] According to one aspect of the invention, the gantry
assembly 1 is adapted to cooperate with a power system, a control
system, a gantry conveyance system including a track system, a
bridge span connection system, a first ground conveyance system and
a second ground conveyance system. As shown in FIGS. 1A and 2,
according to one embodiment of the invention, the invention is
directed to a system 200 for removal or placement of a bridge span
6 of the type which spans and is supported by adjacent piers
25.
[0347] Control and Power Systems
[0348] As shown in FIG. 1B, according to one embodiment, two
hydraulic power units 30 carried by the gantry 100 near the ends of
the gantry 100, power both the vertical support and lift system and
the vehicles of the gantry conveyance system. The power units are
schematically shown as two small boxes without intending to comment
on their relative size, adjunct parts or surface configuration. The
user interface of the control system is optionally localized in a
single remote control unit, optionally configured as a computer 32
in a robust tablet format with a joystick 34. The control system
may comprise a system of the type known as a computer-aided remote
lift (CARL-Lift Systems Inc.) system for coordinating the vertical
height of the gantry legs portions 20. Optionally, the same control
unit also controls movement of the vehicles 12 and 14 including
power supplied to the vehicle hydraulics as well as the direction
of movement of the vehicles. Convenient settings enable the
joystick to either move the vehicles simultaneously or one or the
other individually. A hydraulic power unit 30 is optionally
allocated to each vertical support assembly and a vehicle. For
example, in terms of capacity is optionally capable of supplying
approximately 3000 kN (kilonewtons) of lift force (e.g. as 2,500
psi) to each vertical support assembly (to each pair of leg
portions).
[0349] Gantry Conveyance System
[0350] The gantry conveyance system 10 optionally comprises a pair
of separately locatable, optionally hydraulically powered vehicles
12 and 14, and a track system including a track 3. However, it will
be appreciated that a single vehicle (in the sense of a
horizontally conveyable moving structural member to which a bridge
span connection system e.g. in the form of straps, is connected may
be adapted to support a bridge span 6 at laterally spaced positions
representing separately conveyable/locatable points of
suspension.
[0351] General design parameters affecting the choice of components
of the gantry conveyance system 10 include the length of the gantry
100 and the length of the respective vehicle(s), the length of the
track 3, whether track 3 overhangs the gantry 100 or is
horizontally displaceable relative to the gantry 100, whether the
connectors from which supporting rigging is suspended move
horizontally in relation to a vehicle etc.
[0352] In general, the points of suspension are widely separated
when the load is fully supported by the gantry conveyance system.
They are more narrowly separated when the load is shared between a
ground conveyance system and a gantry conveyance system. In
principle, the gantry conveyance system and/or bridge span
connection system and/or track system can be adapted so that the
distance between suspension means can be both lengthened and
shortened, in the course of operation.
[0353] As seen in FIG. 1A, the gantry conveyance system comprises
two independently locatable vehicles 12 and 14, each respective
vehicle conveyable along the gantry 100 to a respective vehicle
position limit and to a relative vehicle position limit (the
vehicle closest to the end of the gantry interposes and defines a
position limit for the other vehicle) defined by the relative
position of the vehicles on either end of the gantry 100,
separation of the vehicles towards the vehicle position limits
adapted to suspend the bridge span from both ends of the gantry, as
best seen in FIGS. 3B, 3F and 3G. As best seen in FIGS. 3D and 3E,
to transfer the bridge span from the gantry conveyance system to
the ground conveyance system, or vice versa, in a staged fashion,
the vehicle separation is reduced. Analogously, where a first or
second ground conveyance system consists of two rail cars, the
distance between the rail cars varies according to the stage of
load transfer.
[0354] A load-bearing gantry conveyance system 10, supported by the
gantry 100, is adapted to independently support the weight of the
bridge span 6, and configured for conveying a bridge span 6 in a
substantially horizontal plane along the length of the gantry 100,
movement of bridge span 6 relative to the gantry 100 via the gantry
conveyance system 10 defining at least a first portion of a
horizontal transport plane, the gantry conveyance system defining
vehicle position limits in terms of theoretical position maxima
including a forward vehicle position limit proximal to one end (a
forward end) of the gantry 100 and rearward vehicle position limit
proximal to the other end of the gantry 100.
[0355] According to one embodiment of the invention, the track 3 is
secured to the gantry and is preferably brought onto the bridge
span replacement site as part of the gantry assembly. Each vehicle
(12, 14) comprises a spreader structure 16. The spreader structure
16 is oriented transversely with respect to the longitudinal axis
of the gantry 100 for distancing two points of suspension of the
bridge span from the center of gravity of a vehicle (12, 14). lite
spreader structure 16 is thereby configured to suspend a bridge
span (6, 36) from two sides of the gantry 100.
[0356] Bridge spans vary in length. In this connection, it should
be appreciated, that according to one embodiment of the invention
described in most detail herein, a gantry 100 of approximately 150
feet length may be well suited to reprice a bridge span (6, 36) of
approximately 110 feet in length. For example, the outrigger
portions 11A and 11B, are positioned at a distance from the end of
the gantry (e.g. 10 feet from each end). The outrigger portions 11A
and 11B block horizontal movement of the straps 7 in the process of
conveyance of a bridge span in a horizontal transport plane
organized to transfer of the load attributable to an end of the
bridge span to or from the gantry conveyance system, since support
points for the straps on the gantry conveyance system are above
them. Therefore, while the size of the gantry, or the size track
system (if more or less limiting) relative to the length of the
bridge span, defines absolute vehicle position limits, in the
embodiment described, the position of the outrigger portions
relative to the end of the gantry practically define the vehicle
position limits, since these positions may practically define
relative vehicle positions determining the practical horizontal
conveyance distances required for load transfer to (or from) the
ground conveyance system.
[0357] Therefore, in our example of a gantry of 150 in length with
the outrigger and leg portions spaced 10 feet from the end of
gantry, the usable span of the track 3 may be 130 feet. Other
factors that need so need to be taken into account in this regard
are support positions of the straps relative to the end of bridge
span, the positioning of the rail cars of the ground conveyance
systems (limited by the ends of the track proximal to piers when an
existing bridge span is lifted or absent) and the positions of the
support surfaces of the rail cars relative to the positions of the
gantry legs and the ends of the bridge spans. As a general rule of
thumb, for removal of an existing bridge span, at a stage when the
rail cars are positioned next to one another, the bridge span
support surface of forward rail car should at least be able to be
approximately aligned with the forward end portion of the bridge
span e.g. when the bridge span is positioned at the strap position
limit (a position that allows a rearward rail car to be positioned
behind the forward rail car). Similarly, during installation of a
new bridge span, the support portion of the rear rail car should be
aligned with a rearward end of the bridge span which may require
that the support portion be horizontally aligned with the gantry
leg (a position that allows the forward rail car to be positioned
in front of the rearward rail car).
[0358] Bridge Span Connection System
[0359] A best seen in FIGS. 1 and 5A-5C, according to one
embodiment of the invention, a bridge span support system takes the
form of bridge span suspension system. The bridge span suspension
system takes the form of a bridge span connection system which
comprises straps 7 which may be optionally looped to form
slings.
[0360] Each end of the spreader structure 16 is displaced
sufficiently from a center of gravity of a vehicle (12, 14) to
define a line of sight between a respective end of the spreader
structure 16 and a point of contact or connection of the strap 7 to
the bridge span, the spreader structure 16 optionally sized to
exceed the width of the gantry 100 (e.g. approx. 7 ft. plus)
[0361] Each end of the spreader structure 16 is operatively
associated with a connector for connecting a strap 7, the connector
optionally in the form of a shackle 900 which may be rotationally
mounted. The distance between the connectors 900 is longer than the
width of the gantry 100. Optionally, there are also connectors on
the form of shackles (optionally rotationally-mounted) on the
bridge span (not shown). Rotationally-mounted connectors 900 are
optionally configured to permit the sling arm to have play in plane
parallel to longitudinal axis of the gantry (e.g. the connector is
mounted for rotation about an axis perpendicular to the
longitudinal axis of the gantry). The straps 7 are adapted to
suspend a bridge span 6 beneath the gantry 100 (they are long
enough so that the bridge span clears lower edge of gantry 100
which defines the upper limit of the horizontal transport plane,
the horizontal transport plane also having a lower limit defined by
the height of the support bed of the ground conveyance system).
[0362] Ground Conveyance System and Load Transfer
[0363] A load-bearing, ground engaging, first ground conveyance
system 26 is adapted to be positioned on load-bearing second
ground-support locations in the vicinity of the bridge-span support
surface of a forward pier 25, the ground conveyance system adapted
to be driven on a path preferably defined by a train track 24, the
path defining a horizontal displacement distance which extends a
forward vehicle position limit on at least a first side of the
gantry 100 by a distance sufficient to transfer full load support
from the gantry conveyance system 10 to the ground conveyance
system 26, the ground conveyance system 26 optionally including a
forward rail car 15 and rearward rail car 24 each having a support
portion 8 for supporting the weight of a bridge span 6. The
vertical support system and lift system is adapted to raise the
gantry 100 to a height in which the lower limit of the first
horizontal transport plane is above and clears the support portion
8 of the ground conveyance system 26, such that the train bridge
span 6 can be conveyed by the gantry conveyance system 10 into
horizontal alignment with a load transferring first position
overlying support surfaces 8 of the ground conveyance system, and
received for support on the support surfaces is of the ground
conveyance system 26 for conveyance through a horizontal
displacement distance, optionally using the vertical support and
lift system to lower the bridge span 6 on the ground conveyance
system 26.
[0364] The outrigger portion 11 is configured to laterally displace
a leg portion from lateral perimeters of the gantry 100, the
lateral displacement accommodates passage of bridge span 6 between
the leg portions 20 of the first and second vertical support
assemblies (2, 29) to enable load transfer from the gantry
conveyance system to the ground conveyance system and vice
versa.
[0365] As shown in FIGS. 3B to 3D the track 3 defines a forward
vehicle position limit A1 at a first end thereof and a rearward
vehicle position limit A2 at a second end thereof. The ground
conveyance system extends the horizontal transport plane so that
the existing bridge span can be transferred from the gantry
conveyance system to the ground conveyance system.
[0366] As shown in FIGS. 1 and 3B-3D a ground conveyance system
comprising a forward rail car 15 and a rearward rail car 13 may be
used in conjunction with the gantry conveyance system to convey an
existing bridge span from a position above the piers with partial
load support from forward rail car 15 supporting a forward end of
the existing bridge span and partial load support from the rearward
vehicle 13 supporting a rearward end portion of the existing bridge
span as described below.
[0367] As shown in FIGS. 1 and 3B-3D, the forward vehicle 14 is
positioned on the track in a position more proximate to the
direction of removal of the existing bridge span 6 or installation
of a replacement bridge span 36, assuming the replacement bridge
span 36 is launched from the same direction to the one in which the
existing bridge span is removed (i.e. from the opposite side of the
gantry installation). It will be appreciated that a replacement
bridge span may be launched from the opposite direction to the one
in which the existing bridge span is removed (i.e. from the same
side of the gantry installation). It will also be appreciated that
installation of the gantry according to the particular method
described herein requires an existing bridge span or surrogate to
effect a gantry installation using a pre-installation conveyance
system.
[0368] As seen in FIGS. 1A and 3E-3F, a load-bearing second ground
conveyance system 21 is used to install a replacement bridge span
36, the second ground conveyance system 21 optionally including a
forward rail car 17 and a rearward rail car 19 positioned on
load-bearing third ground support locations in the vicinity of the
bridge span support surface of pier 25, the forward rail car 17
positioned more proximal to the gantry assembly 1.
[0369] Optionally, referring to FIGS. 3B to 3D, the track 3 is
sufficiently long to allow the forward end portion of the bridge
span 6 to be horizontally aligned with the forward rail car 15 (in
principle, the forward vehicle 14 need not be positioned as far
forward as the forward rail car 15) so that the load corresponding
to the forward end of the existing bridge span can be transferred
from the forward vehicle to the forward rail car (having regard to
relevant parameters such as the proximity of the point of
attachment of the load-bearing strap(s) to that end of the bridge
span, relative positions of the first and second ground-support
locations and the length of a vehicle and rail car).
[0370] Similarly, referring to FIGS. 3E to 3G, when a replacement
bridge span 36 is brought in from an opposite side of the gantry
installation, the sedative vehicle position limit of the forward
vehicle 14 (taking in account the space on the track occupied by
the rearward vehicle) allows the forward end portion of the
replacement bridge span to be positioned substantially over the
forward rail car 15 of the fourth conveyance system.
[0371] This length of track preferably allows the rearward end
portion of a bridge span to occupy a position over the rearward
rail car 19 of the second ground conveyance system (taking into
account the position of the strap relative to the rearward end
portion of the replacement bridge span) so that the portion of the
load attributable to the rearward end of the bridge span can be
transferred from the rearward vehicle 12 to the rearward rail car
19. Optionally, the usable portion of the track (defining vehicle
position limits, as well as relative vehicle position limits i.e.
the forward-most position of the rearward vehicle at the forward
end of the track) may be approximately as long as the gantry and
may also be selected so that both the forward and rear rail cars
can be positioned underneath the track (it will be appreciated that
relative position limits may be defined in terms the length of the
forward vehicle as well as a modest amount of space that is
maintained between the vehicles and between the forward vehicle
position and the forward position limit). In this regard, it will
be appreciated that the points of attachment of the straps proximal
to an end portion of the bridge span may be selected to be a
certain distance from end of the bridge span and that the bridge
span may not be supported by a rail car at its very end.
[0372] The undersurface of the end of a bridge span 36 may be
adapted for support on a rail car and/or on the bridge span support
surfaces of the adjacent piers (see support portion 110--FIG.
3F).
[0373] Gantry Assembly Installation
[0374] By way of overview, as seen in FIGS. 1A and 1B, illustrating
a simplified view of an embodiment of a gantry assembly
installation, in addition to a gantry assembly 1 described in
detail below, such an installation optionally initially comprises
at least a portion of a gantry conveyance system 10 in the form of
a track 3 belonging to a track system supported by the gantry 100.
Optionally, vehicle(s) 12 and 14 may be supported on the track when
the gantry assembly 1 is initially brought to the work site.
[0375] Furthermore, by way of overview, as best seen in FIGS. 1B
and 3B, a ground conveyance system 26 may be positioned at load
bearing second ground-support locations proximal to the area
overlying bridge span support surfaces 22 of piers 25. The bridge
span support surfaces 22 of the piers 25 and typically below track
level. A train track support substructure of a bridge span 6 may
typically have a series of beams 605 connected at spaced junctions
by struts 606 attached to the beams 605, the points of attachment
of the struts to the beams exemplifying ideal first, second and
third load bearing ground-support locations for a supporting a
gantry assembly installation.
[0376] The outrigger portion 11 is configured to position the leg
portions 20 perpendicularly to the gantry 100 outside the footprint
area of the first ground conveyance system with the ground engaging
leg portions 20 overlying the first ground support locations such
that when the gantry 20, vertical support system (2,29) and lift
system are operatively connected on the pre-installation conveyance
system 27 and the pre-installation conveyance system 27 is
transported into horizontal alignment with the first ground support
locations, the lift system can extend the leg portions 20 thereby
lowering the ground engaging portions 49 of the leg portions onto
the first ground support locations to lift the gantry 100 off the
pre-installation conveyance system 27 and effect a gantry
installation, the vertical positions preferably including a
vertical position of a height sufficient for the pre-installation
conveyance system to be removed from or repositioned beneath the
gantry assembly installation, optionally, for re-use in or as or as
part of a ground conveyance system.
[0377] Optionally, the lift system of the vertical support and lift
system is a hydraulic lift system. Optionally, each vertical
support assembly (2, 29) comprises two hydraulically extendible leg
portions 20 whereby the effective linear vertical distance between
the ground engaging portion of each gantry leg portion and the
gantry is adapted to be hydraulically varied by the lift system. As
described herein, the leg portions 20 are optionally connected to
the gantry 100 via an outrigger portion 11 such that the hydraulic
leg portions 20 of the vertical support assemblies 2 and 29 are
laterally spaced apart so an extent accommodating extension of the
hydraulic legs to clear the lateral perimeters of the
pre-installation conveyance system 27 to effect a gantry
installation from off the pre-installation conveyance system
(directly from a position in which the gantry assembly 1 rests
horizontally on the pre-installation conveyance system 27).
Preferably, the leg portions 20 of both vertical support assemblies
2 and 29 are laterally spaced apart to an extent permitting
horizontal movement of the train bridge spans 6 and 36 between them
so as to enable the first and second ground conveyance systems to
work from opposite sides of the gantry assembly 1. Optionally, this
lateral distance is greater than the width of the rail cars of the
pre-installation conveyance system. It will be appreciated that the
pre-installation and ground conveyance systems may share rail cars.
The numbering (i.e. first and second) used for the conveyance
systems is not meant to imply that rail cars must be allocated to
one conveyance system to the exclusion of another where sharing of
rail cars is practical.
[0378] As best seen in FIGS. 5A and 5B the lateral perimeters of
the gantry assembly footprint lie adjacent to the lateral
perimeters of the support bed 800 of a rail ear 28 of the
pre-installation conveyance system 27 when the gantry assembly in
supported on the pre-installation conveyance system 27 in the
stowed position (5A). Optionally, the lateral perimeters of the
gantry assembly lie within the lateral perimeters of the footprint
area of the pre-installation conveyance system.
[0379] As best seen in FIGS. 1A and 1B and FIGS. 5A, 5B and 5C, leg
portions 20 of the vertical support assembly are adapted to be
contracted or shortened by the lift system so occupy a compact
configuration which is optionally, beneath, at or above the height
of the support platform of the pre-installation conveyance system
when the gantry assembly is supported on the support platform in
the stowed position. Extension oi the gantry legs onto first ground
locations may require the ground locations to be adapted for load
support. For example, a ground engaging load bearing support beam 9
may be installed over load supporting ground material at ground
locations corresponding to planned ground positions of ground
engaging portion(s) of the vertical support assemblies 2 and 29.
For example, the support beams in the form of beam assemblies 9 may
be supported on same ground material that the railroad ties are
supported on (e.g. track ballast comprising coarse aggregate; a
structure associated with an adjacent bridge span etc.) under
portions of a train track leading respectively to and from an
existing bridge span. The support beams may be positioned to have a
top-surface height which provides load-bearing support to the
under-surface of train-track rails proximal to the first ground
locations and may be supported at ground locations at least
partially formerly occupied by railroad ties. Thus installing a
gantry assembly may involve advance removal of existing railroad
ties and their replacement by a support beam optionally in the form
of middle portion 9B of beam assembly 9 (see FIG. 1B).
[0380] It is noteworthy, that the lateral span of the outrigger
portions 11, when rotated into the installation position, may
exceed the lateral dimension of the railroad ties and the lateral
span of supporting ground material such that the ground engaging
portions of leg portions 20 may be positioned outside the available
ground support area adjacent to the first ground locations.
Particularly in the case of a train bridge spanned by multiple
piers and bridge spans, replacement of a bridge span interposed
between two others may require the first ground locations,
optionally represented by the ends 9A and 9C of a beam assembly 9,
to overhang the available contiguous ground support material. The
first ground locations may therefore be `manufactured` and
installed in advance and/or as part of a gantry assembly
installation process for example by employing a three section beam
as shown in FIG. 1B and best seen in FIGS. 5A, 5B and 5C. In
particular, end portions 9A and 9C of the support beam may be
carried on site suspended from the gantry legs and then fastened on
the middle portion 9B of support beam assembly 9 as seen in FIG.
1B. Portions 9A and 9C may be removed from ground engaging portions
49, fastened onto portion 9B (see FIG. 1B) and then ground engaging
portions in the form of foot portions 49 are securely fastened onto
portions 9A and 9C respectively. Alternatively, when the gantry
assembly is transported by a pre-installation conveyance system 27
into alignment with first ground support locations, the gantry leg
portions 20 may be extended as particularly required to vertically
align beam portions 9A and 9B with 9C with the aid of abutment
portions 40 so that beams portions 9A and 9C can be fastened onto
portion 9B while the weight of the gantry assembly is still borne
by the pre-installation conveyance system. Accordingly, according
to one embodiment of the invention, the leg portions of each
vertical support assembly may include or may be adapted to be
operatively associated with a vertical alignment means, for
example, a descent-arresting abutment or stop means, for example a
laterally projecting abutment portion 40 for aligning the overhang
portions of a support beam 9A and 9C with a ground-supported
portion 9B, for example, flange or plate 40 which extends laterally
inwardly from portions 9A and 9C in the course of being lowered.
The overhang portions 9A and PC of an overhang ground support
system are adapted to be attached e.g. by fasteners, to a
ground-supported portion of a ground support structure in the form
of beam portion 9B. These overhang portions 9A and 9B and are
optionally adapted to be secured e.g. by fasteners, to the foot
portions 49 of the leg portions 20. The ground-supported portion 9B
is optionally similarly adapted. Therefore, the ground engaging
portions 49 of the leg portions 20 are adapted for use with an
overhang ground-support system.
[0381] Method
[0382] According to one embodiment of the invention, the method
comprises, as best seen in FIGS. 2 and 5C:
[0383] using a pre-installation conveyance system 27 including at
least one rail car 28 to convey a gantry assembly 1, preferably
supported in a substantially horizontal position, into horizontal
alignment with a plurality of load-bearing first ground-support
locations, wherein the gantry assembly 1 overlies an existing
bridge span 6; and
[0384] controlling the vertical support and lift system to lift the
gantry assembly 1 off the pre-installation conveyance system 27 to
effect a gantry assembly installation.
[0385] This makes it possible to remove or re-position rail cars
28, and as necessary secure the ground engaging portions of the leg
portion 20 to support surfaces, e.g. tie beams 9, at the first
ground-support locations.
[0386] Optionally, at least one component of the pre-installation
conveyance system 27 e.g. rail cars are reused as part of a ground
conveyance system 21 and/or 26. For re-use the position of the rail
cars 28 may need to be adjusted to be positioned at second and/or
third ground support locations. Alternatively they are removed from
beneath the gantry assembly 1. Locomotive 770 may remain on-site to
transport an existing bridge span 6 away from the work site.
[0387] In connection with removing or repositioning the
pre-installation conveyance system 27 from beneath the gantry 100,
where the lateral perimeters of the pre-installation conveyance
system 27 are wider that the gantry, the gantry assembly 1 is
configured so that the ground-engaging portions of the leg portions
20 are suspended outside the lateral perimeters of the
pre-installation conveyance system footprint so as to provide
lateral clearance for the ground engaging portions to be extended
onto the first ground-support locations and for the
pre-installation system to be re moved/repositioned from beneath
the gantry 100. As described above with reference to FIGS. 4A-4B
and 5A-5C this is accomplished, according to one embodiment of the
invention, by rotating the outrigger portions 11A and 11B from a
stowed position into an installation position and securing the
outrigger end plates 610 to another portion of the gantry
connection portion, for example a mating end plate portion 615,
which is securely fixed to the gantry or at least adapted to be
securely fixed in a position to provide the necessary support and
stability.
[0388] According to one embodiment of the method, defined in terms
of positioning of vehicles 12 and 14 of the gantry conveyance
system 10 and the at the least one rail car of the ground
conveyance system 26, it is key that the gantry conveyance system
10 and bridge span connection system are adapted for horizontally
conveying a raised existing bridge span in a horizontal transport
plane over distance sufficient to transfer a load corresponding to
the weight of the existing bridge span 6 in at least one stage onto
a support portion of a ground conveyance system 26.
[0389] The method further comprises (see FIGS. 3A and 3B):
[0390] bringing a ground conveyance system 26 into horizontal
alignment with load-bearing second ground-support locations in
which the ground conveyance system 26 is positioned on a path
defined by a portion of a train track contiguous with the train
track overlying the existing bridge span;
[0391] adjusting the height of the gantry 100, if necessary,
connecting the bridge span connection system in the form of straps
7 (optionally looped to form a sling) between the bridge span 6 and
the gantry conveyance system 10, such that the bridge span 6 is
prepared to be suspended from the gantry conveyance system 10 when
the gantry 100 is lined by the vertical support and lift system
into the at least one horizontal transport plane;
[0392] Controlling the vertical support and lift system to raise
train bridge span 6 into the least one horizontal transport
plane;
[0393] Using the gantry conveyance system 10 to convey the bridge
span 6 into at least one load transferring position overlying a
support portion of the ground conveyance system (see FIG. 3C), the
load transferring position adapted for transferring a load
corresponding to the weight of the bridge span from the gantry
conveyance system 10 to the ground conveyance system 26; and
[0394] Transferring a load, corresponding to the weight of the
bridge span 6, from the gantry conveyance 10 to the ground
conveyance system 26 (optionally vehicles 13 and 15), the control
system controllable to lower the existing bridge span 6 onto the
support portion 8 of the ground conveyance system 26 (see FIG.
3D).
[0395] The latter steps, described in general terms may be
accomplished, according to one embodiment of the method, as
follows:
[0396] the gantry conveyance system 10 is used to convey the bridge
span 6 towards a vehicle position limit into a load-transferring
first position overlying the ground conveyance system 26 to
transfer the load attributable to a forward end portion of the
bridge span to the ground conveyance system 26, whereupon the
ground conveyance system 26 in combination with the gantry
conveyance system 10 are used to convey the train bridge span
beyond the vehicle position limit to a load transferring second
position in which the load attributable to a rearward end portion
of the existing bridge span is transferable to the ground
conveyance system and a load attributable to the rearward
end-portion of the existing bridge span 6 is then transferred to
the ground conveyance system 10, such that the existing bridge span
6 is removable from the work site.
[0397] More particularly, the gantry conveyance system may include
a hydraulically powered forward vehicle 14 and a hydraulically
powered rearward vehicle 12 riding on a track 3 of the track system
and the ground conveyance system may comprises a forward rail car
15 and a rearward rail car 13, each rail car having a bridge span
support bed 8, wherein in operation:
[0398] the existing bridge span 6 is raised into the as least one
horizontal transport plane by actuation of the vertical support and
lift system and transported in a horizontal plane by the forward
vehicle 14 and rearward vehicle 12 until the forward vehicle 14
approaches a forward vehicle position limit in which the existing
bridge span is positioned above the support bed of the forward rail
car 15, whereupon a portion of the load attributable to the forward
end portion of the existing bridge span 6 is then transferred onto
the forward rail car 15, optionally by using the lift system to
lower the gantry 100; and
[0399] wherein the existing train bridge span 6 is then conveyed
toward a full ground support position with at least partial support
from the forward rail car 15 supporting a forward end portion of
the bridge span 6 and the rearward vehicle 12 supporting a rearward
end portion of the bridge span 6 until the rearward end portion of
the bridge span is positioned above the support bed of the rearward
rail car 13, whereupon the load is transferred onto a support bed
of the rearward rail car 13 preferably by using the lift system to
lower the gantry 100.
[0400] Replacing the existing bridge span 6, with a replacement
bridge span 36, as shown in 3E to 3H, optionally involves the
following general steps:
[0401] Using a second ground conveyance system 21 optionally
comprising rail cars 17 and 19 to convey a replacement bridge span
36 into alignment with load bearing third ground-support locations
corresponding to portions of a train track leading to the rearward
pier at which at least a forward end the replacement bridge span 36
is positioned under the gantry conveyance system 10;
[0402] Transferring a load attributable to at least a forward end
portion of the replacement train-bridge span 36 to the gantry
conveyance system 10 (e.g. vehicles 12 and 14) and a bridge span
connection system including straps 7;
[0403] Using the gantry conveyance system 10 and the second ground
conveyance system 21 (e.g. vehicle 19) to convey the replacement
bridge span 36 into horizontal alignment with a third
ground-support location in which a rearward end portion of the
replacement bridge span 36 is positioned under the gantry
conveyance system and transferring a load attributable so the
rearward end portion of the replacement train-bridge span to the
gantry conveyance system 10 and the bridge span connection
system;
[0404] Using the gantry conveyance system 10 and bridge span
connection system to convey the replacement bridge span 36 into
horizontal alignment with bridge span support-surfaces 22 of the
piers 25;
[0405] using the vertical support and lift system to lower the
replacement bridge span 36 onto the bridge span support-surfaces 22
of the piers 25.
[0406] More particularly, the gantry conveyance system may include
a forward vehicle 14 and a rearward vehicle riding on a track 3 and
the ground conveyance system comprises a forward rail car 17 and a
rearward rail car 19, each rail car having a bridge span support
bed, wherein in operation:
[0407] Using the forward rail car 17 and a rearward rail car 19 to
convey a replacement bridge span 36 into alignment with load
bearing third ground-support locations in which a forward end the
replacement bridge span 36 is positioned under the forward vehicle
14;
[0408] Transferring a load corresponding to a forward end portion
of the replacement bridge span 36 to the forward vehicle 14 and the
bridge span connection system;
[0409] Using the forward vehicle 14 in conjunction with the
rearward rail car 19 and the bridge span connection system to
convey the replacement bridge span 36 into horizontal alignment
with a third ground-support location in which a rearward end
portion of the replacement bridge span 36 is positioned under the
rearward vehicle 12 and transferring a load attributable to the
rearward end portion of the replacement train-bridge span from the
rearward rail car 19 to the rearward vehicle 12 and bridge span
connection system;
[0410] Using the forward vehicle 14 and rearward vehicle 12 in
conjunction with the bridge span connection system, to convey the
replacement bridge span 36 into horizontal alignment with bridge
span support-surfaces of the first and second piers; and
[0411] Using the vertical support and lift system to lower the
replacement bridge span onto the bridge span support-surfaces of
the first and second piers.
[0412] Subsequently the bridge span connection system including
straps 7 are removed from the replacement bridge span 36; and
[0413] Again, adjusting the height of the gantry, as necessary,
conveying a post-installation conveyance system including a support
bed configured to support the gantry installation under the gantry
assembly installation and using the lift system to lift the ground
engaging portions 49 of the vertical support system from the first
ground-support locations such that the weight of the gantry
assembly 1 is transferred onto the post-installation conveyance
system (not shown); and
[0414] transporting the gantry assembly 1 away from the replacement
bridge span.
[0415] Optionally, the method is executed according to a schedule
that accommodates a scheduled maximum delay of train traffic across
the train bridge (e.g. 6 to 16 hours), the path at least of
sufficient length to convey the existing bridge span to a site for
off-loading the existing bridge span.
[0416] Optionally, a combined footprint of the pre-installation
conveyance system 27 and gantry assembly 1 supported thereon is
accommodated by an existing train route for bringing the gantry
assembly 1 onto a gantry installation worksite including through or
via any train tunnel, train track or train station along the
existing train route.
[0417] Optionally, a combined footprint of the post-installation
conveyance system and gantry assembly supported thereon is
accommodated by an existing train route for bringing the gantry
assembly off a gantry installation worksite and optionally onto a
new gantry installation worksite including through or via any train
tunnel, train track or train station along the exiting train
route.
[0418] Definitions
[0419] The phrase "horizontal alignment" means positioning on or
with reference to a horizontal surface or the x-y coordinates of a
horizontal plane, as opposed to with reference to a vertical
position, such that the gantry assembly, for example, is positioned
correctly to align with positions on, along or adjacent to a path
of travel, so that, for example, it is spaced correctly with
respect to prepared support structures such as a tie beam and/or
the piers and/or is otherwise preferred e.g. for load support e.g.
placement at the point of greatest load tolerance e.g. the juncture
of two diagonally positioned struts or overlying an area proximal
to a vertical strut).
[0420] The term "horizontal" means "functionally horizontal" as
appreciated by persons skilled in the art having regard to any
impact on stability with reference to context e.g. motion
(transport plane) or stationary (e.g. support).
[0421] The term "end" as used herein, primarily to refer so the end
of a gantry, a track system or track or a bridge span. This term
means an `end portion` of the structure in question, such that any
support provided, leverage gained or strength feature etc. achieved
at or from the end portion, yields a useful practical mechanical
advantage, self-evident design choice or other intuitive benefit,
for the purposes of the invention, as understood, in context, by
persons skilled in the relevant arts. Hence, in practical
contextual terms, "end" would not be understood to be limited to
the geometric or linear end of the structure unless a person
skilled in the art would consider implementation from a geometric
end to be intended having regard to practical, predictable design
considerations.
[0422] Similarly the term "proximal" means "functionally proximal"
and in effect connotes a distance or nearness aspect which for
practical purposes is useful for realizing any purpose of the
"proximity" (similarly understood, in context, from the standpoint
of achieving any practical mechanical advantage, design choice or
other evident organizational benefit). For example, supporting a
bridge span "proximal" to an end thereof would be understood to
encompass a practical range of locations on the bridge span having
regard to support considerations as well as the consequent
horizontal distance over which the bridge span would have to be
transported to transfer the load attributable to an end portion of
the bridge span from the gantry conveyance system to the ground
conveyance system. For example, this distance would be longer if
the rigging suspending the bridge span was attached to the bridge
span closer to the end thereof. Similarly, this distance would be
shorter if the very end of the bridge span was brought to rest on a
rail car of a ground conveyance system, as opposed to a portion
more remote from the end.
[0423] The term "forward" when used to describe a rail car (first
or second ground conveyance system) or a support member, suspension
means or vehicle (gantry conveyance system) or an end of a gantry,
gantry assembly, or bridge span, refers to that which is "leading"
in the intended discretion of transport. Similarly, the term "rear"
or "rearward" refers to that which is "trailing". It will be
appreciated that the direction of transport, for convenience, may
be the same for removing an existing bridge span and bringing in a
new or replacement bridge span from the opposite side of a bridge,
however, as suggested herein, in certain circumstances wherein the
existing bridge span can be off-loaded or removed from the railway
relatively quickly, removal of the existing bridge span and
installation of a replacement bridge span may be done from the same
side of the bridge (i.e. the direction of transport would be
different).
[0424] The term "securely" used with reference to positioning of
the ground engaging portions of the leg portions of the vertical
support and lift system at the first ground locations, means that
the ground engaging portions are as least operationally constrained
from moving in a horizontal plane so as to resist movement out of
position and buckling.
[0425] The term "separately locatable" means that a component in
question can be separated, by a plurality of fixed distances or by
a variable (continuous) distance from the remainder of a system or
another component of the system such that it can, at least
operatively, be positioned independently. With respect to the
gantry conveyance system, the phrase "separately locatable" implies
that the vehicles can at least be separated to varying degrees but
does not imply that they necessarily have independent methods of
propulsion and that the vehicles have no common portions.
Optionally, the component in question e.g. a vehicle, is
unassociated i.e. completely independent e.g. of a second vehicle
("independently locatable"). By contrast, the term "independently
locatable" further implies that the vehicles are fully independent
in a sense including being unlinked, independently controlled and
driven by separate propulsion sources (despite being functionally
inter-dependent) for example, separate connection lines to a single
or two hydraulic power units.
[0426] It will be appreciated that the strategy of having a pair of
horizontally movable points of support e.g. suspension which are
separately or independently locatable" potentiates, at least in
theory, "maximal" rearward movement of a forward point of support
e.g. suspension (e.g. for conveying a new bridge span into
position) and "maximal" forward movement of rearward point of
support e.g. suspension (e.g. for removing an existing bridge span)
enabling the bridge span to be supported e.g. suspended proximal to
its ends.
[0427] It will be appreciated that two separately locatable points
of suspension so may be conveyable, for example in a load-moving
sense, in tandem, for example by providing connection points at
spaced positions by which they become temporarily fixed to move
together so that in principle only although both suspension means
need to be conveyable at least a passive sense if not actively
(under some form of power) only one vehicle is needed for moving
the load on the gantry conveyance system. Optionally both
suspension means are conveyable under some form of power system,
optionally both are sufficiently powered to move at least half of a
load corresponding to the weight of a bridge span.
[0428] The term "path" means any demarcated or non-demarcated area
which is or is subject to being cleared to allow movement or
transport.
[0429] The term "gantry conveyance system" is used to refer a
conveyance system supported on the gantry.
[0430] The descriptors "first" and "second" as applied herein to
ground conveyance systems used in conjunction with the gantry
conveyance system, are used to refer to a system for removal of an
existing bridge spars and a system for installation of a
replacement bridge span, respectively. It will be appreciated that
the as least one rail car used as part of a ground conveyance
system for removing an existing bridge span may be reused on the
same side of the gantry installation to install a replacement
bridge span provided that the rail car(s) is/are able to be freed
up for this purpose in a practical time frame. Irrespective of
winch rail cars are being used, the same side of gantry may be used
for both removal and installation of a bridge span provided that
the accommodating portion of track proximal to the pier in question
can be accessed in a practical time frame for both activities.
Subject to the proviso that an existing bridge span is assumed to
be available for installing a gantry assembly, the invention, is
not limited to the combined activities of removal and replacement
of a bridge span and may reside in either one of these activities
independently as well as in preliminary steps involved in
installation of a gantry assembly for either purpose. It will also
be appreciated that the invention herein has application to
installation of a gantry assembly for removal or installation of
any type of bridge span.
[0431] The term "strap" means a length of material or connected
materials of sufficient length, strength, and rigidity or
flexibility (from an engineering and safety standpoint) to serve
the function of supporting such part (if the weight of bridge span
as is demanded by the context in which the strap is being used. The
term strap includes, without limitation, webbing and a cable. The
webbing or cable optionally has a weight load limit of 50 tons. The
term suspension means is used to refer to a conveyable means for
suspending the bridge span, a means which serves a conveyance
function and an attachment function. Optionally, the attachment
function is accomplished by a length of material (e.g. a strap) of
predetermined operational length i.e. in principle, the length is
not varied in the course of operation to lower and raise the bridge
span in the fashion of a typical winch. In this connection, it is
noteworthy that the term "lift" as used in the context of a
`vertical support and "lift" system`, connotes raising and lowering
functions depending on the particular stage of the bridge span
replacement process. Accordingly, the term "bridge span connection
system" is used to preferentially describe a length of material of
predetermined operational length.
[0432] The term "sling" is used in broad functional terms to define
parallel straps or portions of a strap wherein the strap material
is integrally looped or connected to form a loop.
[0433] The term "rail car" includes any track engaging vehicle that
is either propelled (pushed or pulled) by another vehicle, such as
a locomotive, or that is self-propelled, and preferably has a
footprint adapted to navigate through standard railway routes that
lead to and from railway bridges of the type that might require
bridge span replacement for example a lateral span of 5-14 feet,
optionally 5 to 12 feet, for example 6 to 10 feet.
[0434] In connection with a train car or rail car, the term
"support platform" when used to described a support portion of the
car for a gantry or gantry assembly is used to mean any type of
load bearing surface used to support the weight of the
gantry/gantry assembly. The term support platform is also used
broadly to refer to a support bed constituted by complimentary
surfaces of two cooperating rail cars.
[0435] The term "gantry" is a term of art and is broadly used
herein to refer to an elongate (optionally overhead) structure
(generally understood to employ conventional structural elements
such as plates, struts, cross bars, beams, etc. to garner strength
while reducing the weight of the structure) which includes or is
operatively connected to an equipment-supporting sub-structure, for
example, a sub-structure in the form of a platform or rails that
support equipment, the equipment according to the invention herein
comprising at least one vehicle of a gantry conveyance system, for
example a vehicle propelled by an external power system or a
self-propelled vehicle. In the context of a system or installation
according to the invention as herein defined, the gantry is a
horizontally positioned bridge span support structure that is
supported by a support system e.g. vertically oriented legs that
are operatively associated with a lift system which vertical
adjusts (i.e. raises and lowers) the height of the gantry so that
the gantry together with a bridge span suspended underneath it, can
occupy a plurality of vertical positions (e.g. height-adjusted
substantially horizontal planes) such that an existing bridge span
can potentially be lifted off bridge-span support surfaces of two
contiguous pier structures and a new bridge span lowered in its
place.
[0436] The term "ground-support", understood from the standpoint of
providing load-bearing support for a gantry assembly, or a first or
second ground conveyance system, is broadly understood to mean, in
contradistinction to support provided from the gantry, a load
bearing ground-supported surface located at a height that is
proximal to the height of the bridge span support surfaces of the
piers of a bridge (in need of span installation or replacement),
optionally in the case of a train-bridge at or near track level.
The invention contemplates that the ground support for the
equipment required to replace a bridge span is essential at "ground
level" as defined herein i.e. roughly at bridge-height level. The
invention contemplates that the ground support is provided by the
piers or from the surface of the ground leading to or from the
bridge (approximately bridge height and not from the level at which
the piers are supported). In principle, the direct support may
include any structure (apart from the gantry) directly or
indirectly supported on the ground area leading to or from the
bridge at which at least one bridge span is intended to be replaced
or on a support surface directly or indirectly supported on or
constituted by the bridge piers located at the bridge in question.
Indirect support may be provided by any load-bearing platform,
pier, slab, beam or other support defining surfaces (vehicle or
stationary), which are in effect supported on the ground,
optionally at ground-level, optionally no ground material,
optionally more proximal to the ground that the vertically elevated
horizontal transport plane provided by the gantry conveyance system
for example, support surfaces of a rail car or other vehicle of the
type more directly and proximally supported on the ground.
Therefore, for example, without limitation, particularly in the
context of the phrase "first ground-support locations" which
provide support for the gantry assembly leg portions, theses
locations may be a surface of a beam or a portion of a beam that
laterally overhangs an adjacent bridge span, the adjacent bridge
span providing ground support for the overhanging support portions
of the support beam. Thus, the term "first ground-support
locations" includes theoretical locations prepared for supporting a
gantry installation either in advance or as part the essential
installation process. For example, the term "first ground-support
locations": encompasses terrestrial (directly or indirectly
supported on the ground) or track-level aerial locations (e.g.
overhang positions) ion which primary or supplementary
ground-associated support material remains to be physically
installed, for example prior to and/or in the process of final
positioning the gantry legs. As described below, first ground
support locations are exemplified by portions 9A and 9C of a beam
assembly that are optionally pre-fastened or temporarily fastened
onto the ground engaging portions of the gantry legs, as described
below, and subsequently fastened onto an earlier installed tie beam
portion 9B which may positioned in place of a standard railway tie
prior to bringing a gantry assembly to the bridge span replacement
site (alternatively called a "work site" or "installation
site").
[0437] In terms of "ground-support", it will be appreciated that a
support bed defined by support portions of a single or linked rail
cars (not separated in operation) of a first ground conveyance
system may be considered to provide "ground support" for some form
friction-reduced horizontal conveyance of a bridge span to load a
bridge span onto the rail car, such as to obviate the need to
employ a pair of individually locatable rail cars. For example, the
bridge span itself or a support bed of the car may be outfitted
with a form of slidable, rollable or otherwise friction-reduced
means of facilitation horizontal travel so that a single or linked
rail cars (e.g. having a bridging platform) can receive the bridge
span incrementally. Similarly, the second ground conveyance system
or a replacement bridge span may be outfitted with a form of
slidable, rollable or otherwise friction-reduced means of
horizontal movement such as to obviate the need to employ a pair of
individually locatable rail cars to transfer load support from the
second ground conveyance system to the gantry conveyance
system.
[0438] The term "ground material" means any natural, man-made or
partially natural and partially made material which constitutes the
ground or part of the ground at first ground locations, second
ground support locations and/or third support ground location and
may include coarse particulate material as well as material formed
into platforms or structures of any type so as to ultimately
provide sufficient load support for rails, railway ties, rail cars
etc. as well as an operational gantry installation. Typically
ground material comprises a layer of coarse aggregate sitting on a
layer(s) of substrate(s), however it will be appreciated that a
wide variety of rails, railroad tie materials and structures are
known, and that rails be may supported on structures that do not
employ railroad ties for support. Hence, the term ground material
encompasses a wide variety of materials. Ground material may
support the ends of unitary or multi-segment tie beam overhanging
the sides on an adjacent bridge span.
[0439] The term "ground level" means a vertical position which
approximately corresponds to a level at or above the height of a
bridge pier or the surface of a bridge span, optionally at a
surface height of "ground material" or the height of a support bed
of a vehicle travelling on the bridge, optionally at a height
approximating the height of vehicle travel on the ground across the
bridge.
[0440] The phrase "overhand ground-support system" means a system
for providing ground support from locations (e.g. aerial locations)
adjacent to areas in which there is "actual" ground support
material or a ground support means, for example in load bearing
ground-support structure that is specially installed, for example a
beam, optionally a tie beam.
[0441] The term "outrigger" is used to mean that the leg portion is
distanced from the gantry. Hence, the "outrigger portion" of gantry
connection portion serves to distance the leg portion from the
gantry.
[0442] The term "track level" means a vertical position
approximately corresponding to the height of a train track,
optionally a height approximately corresponding to a horizontal
plane of travel on a track rail or a height of a surface which
supports a track rail.
[0443] The term "surface configuration", used with reference
describing the gantry assembly, means that the gantry assembly,
optionally the gantry per se (which is optionally flat), has an
exterior surface which is sized and shaped to be supported,
preferably in a horizontal position, by a shape-compatible support
surface/means of a pre-installation conveyance system,
compatibility in this respect being broadly defined such that any
accessories or adjunct means of accomplishing the support (shims,
wedges, rigging, adapter elements) whether commonly used or
specially designed, do not preclude compatibility. Support portions
of a pre-installation may be in the form of a holster and may be of
a stationary, sliding or otherwise friction-reduced type to
accommodate a gentry of suitable length for replacement of the
bridge span in question.
[0444] The term "gantry assembly installation" as used herein, for
example with reference to describing a bridge-span replacement
installation, includes at least a horizontally oriented gantry 100
(see FIG. 1A) supported proximal to each end thereof by a vertical
support system adapted to be operatively associated with a lift
system including ground engaging load-bearing legs 20 which are
positioned on the ground at load-bearing first ground-support
locations located in the vicinity of the bridge span support
surfaces of two piers intended to be longitudinally spanned by the
existing bridge span 6. Depending on the circumstances, the optimal
installation may dictate that the ground engaging portions of the
leg portions 20 are secured to tie beams 9 positioned at the first
ground-support locations.
[0445] The term "full gantry support" refers to a stage of removing
an existing bridge, span or installing a replacement bridge span in
which the entire weight of the bridge span is borne by the gantry
conveyance system.
[0446] The term "horizontal transport plane" refers to a
vertically-elevated (relative to the support bed of a ground
conveyance system) plane of conveyance executed by the gantry
conveyance system prior to partial or full load transfer to the
ground conveyance system and by both systems in tandem. As far as
the gantry conveyance system is concerned, the horizontal limits of
this plane of transport are absolutely defined (in terms of
theoretical maxima--in practice the vehicles may not be able to
reach these theoretical maxima) by vehicle position limits imposed
by the track length of the gantry conveyance system 10. These
limits are extendable by a ground conveyance system.
[0447] Small vertical adjustments in the horizontal transport plane
may be required for load transfer. In practice, though other forms
of load transfer or vertical adjustment are possible (e.g. the
height of the support bed of the ground conveyance system or
partial release of the straps may serve this purpose) using the
lift system to slightly raise or lower the bridge span within this
principal transport plane may be the easiest way to transfer part
of the load to or from a ground engaging conveyance system.
[0448] The term "spreader structure" refers to an elongate
load-bearing support member on the gantry conveyance system e.g.
vehicle oriented transversely with respect to the longitudinal axis
of the gantry, optionally in the form of a steel beam that
laterally distances points of attachment of a bridge span
connection system from the centre of gravity if the vehicle e.g.
shackles supporting loops of strap-like material.
[0449] The term "track" or "track system" is used to describe any
travel path (or system exploiting same) which potentially or
actually interfaces or interacts with a vehicle (as broadly
defined), for example in the sense of defining a course (e.g. via a
guard rail or guide member) which path may or not be an
unchangeable path, and may or may not have a hold on the vehicle.
Preferably, the travel path imposes some restraint or condition on
the travel path (for example linearity) of a vehicle, serving, for
example, as a stabilizing or security means, for example via any
path defining means such an edge, rail, ridge, lip, rib, shoulder,
channel etc. of any kind known to those skilled in the art. Such as
path defining means may optionally fall into the category of being
principally male or female and may be both in some aspect and may
be also consist of or comprise spaced elements which are aligned in
some fashion to collectively define or interact with mating or
corresponding portions of a vehicle in a manner defining a travel
path.
[0450] The term "vehicle" is used broadly to describe a movable
load bearing conveyance device.
[0451] The term "vertical support and lift system" means a vertical
support system that is operatively associated with a lift
system.
[0452] General System Design Parameters
[0453] A two sided gantry that provides a clearance way for members
of a suspension system e.g. steel cables i.e. between the two sides
of the gantry, can be adapted to accommodate railway clearances
(10-13 feet wide) and adapted for using a gantry conveyance system
consisting of one vehicle and a central single point type
suspension system (e.g. a conveyable strand jack) or a two point
suspension system (e.g. employing winches). The gantry may be
constructed with conventional structural members including plate
girders, box beams and trusses of suitable sizes and weight bearing
capacities according to design parameters well known to those
skilled in the art.
[0454] A suspension system may employ well known underslung crane
design systems and related track system supported beneath the
gantry of type applicable to heavy duty lift systems used in
overhead horizontal conveyance systems, for example in which the
trolley wheels ride on the flanges of a box beam or H beam type
support structure.
[0455] With respect to parameters for designing a gantry assembly
as described in detail herein, it will be appreciated: the
outrigger and leg portions of the vertical support assemblies may
be positioned at respective horizontal distances A and B from an
end of the gantry; the positions along an existing bridge span to
which the straps of the bridge span connection system are connected
are located at horizontal distances C and D from the end of the
existing bridge span; the gantry conveyance system may comprise a
track system and a forward vehicle and rearward vehicle, and the
ground conveyance system may comprise a forward rail car having a
bridge span support surface and a rearward rail car having a bridge
span support surface; the forward vehicle rides and along the track
system during conveyance of the bridge span in the horizontal
transport plane with a portion of the bridge span connection system
vertically suspended above the vertical height and within the
lateral span of the outrigger portion, the position of the
outrigger portion inhibiting conveyance of the bridge span
connection system past the position of outrigger portion such that
a longitudinal position oi the outrigger portion relative to an end
of the gantry effectively defines a forward vehicle position limit;
the length of gantry relative to length of the bridge span and the
distances A, B, C and D accommodate alignment of a forward end of
the bridge span with second ground locations corresponding to a
support surface a forward rail car and alignment of a rearward said
of the bridge span with second ground locations corresponding to a
support surface of the rearward rail car.
[0456] In terms of replacing an existing bridge span, the outrigger
and leg portions of the vertical support assemblies are positioned
at respective horizontal distances A and B from an end of the
gantry; the positions along the bridge span to which straps of the
bridge span connection system are connected are located at
horizontal distances C and D from the end of the bridge span; the
gantry conveyance system comprises a track system and a forward
vehicle and rearward vehicle (capable of moving both forwardly and
rearwardly); the second ground conveyance system comprises a
forward rail car having a bridge span support surface and a
rearward rail car having a bridge span support surface; the track
system defines a rearward vehicle position limit and the rearward
vehicle defines a forward vehicle position limit at a rearward end
of the track, system; the forward vehicle and rearward vehicle ride
along the track system during conveyance of the bridge span in the
horizontal transport plane optionally with a portion of the bridge
span connection system vertically suspended above the vertical
height of the outrigger portion and within the lateral span of the
outrigger portion, the position of the outrigger portion inhibiting
positioning of the bridge span connection system past the position
of outrigger portion when the bridge span connection system is
connected to the bridge span; the length of gantry relative to
length of the bridge span, the length of the forward vehicle, the
length of the rearward vehicle, the length of the forward rail car,
the length of rearward rail car, and the distances A, B, C and D
accommodate alignment of a forward end of the bridge span with a
strap position limit of forward vehicle and alignment of a rearward
end of the bridge span with a strap position limit of the rearward
vehicle.
[0457] In terms of the pre-installation conveyance system, the
support portion is a support platform having a platform footprint
area including lateral perimeters; the gantry assembly defines a
gantry assembly footprint area including lateral perimeters;
lateral clearance is affected by the curvature of the train track;
the track system is affixed on top the gantry; the height of gantry
assembly on the pre-installation conveyance system and the lateral
perimeters of platform footprint area and gantry assembly footprint
area define a conveyance envelope that accommodates existing
railway clearances for delivery of the gantry assembly to or from a
site of removal and/or placement of a bridge span (e.g.
approximately 18 feet); optionally the gantry has a substantially
flat surface configuration adapted to be supported on the support
platform reducing the vertical size of the conveyance envelope,
optionally the at least one vehicle rides on top of the track
system during delivery and/or removal of the gantry assembly
increasing the vertical side of the conveyance envelope.
[0458] In terms of the outrigger portion, the outrigger portion is
preferably configured to laterally distance the leg portions of the
first vertical support assembly and the second vertical support
assembly from lateral perimeters of the gantry, by a distance which
accommodates passage of a bridge span having up to a 13 foot wide
footprint between the leg portions of the first vertical support
assembly and the second vertical support assembly.
EXAMPLE
[0459] A gantry may be approximately 150 feet in length). Railway
clearances depending on the location may lie approximately 14 feet
wide and the lateral dimension of the gantry assembly with the
outrigger portion and gantry legs positioned in a stowed position
may be approximately 11-11.5 feet and may be carried on a rail car
having a conventional support deck of approximately 10 feet in
width. A bridge span transported to a gantry assembly installation
may have a lateral footprint which may be approximately a foot
shorter than the maximum lateral railway clearance. When the
outrigger and leg portions of the vertical support assemblies are
in an installation position they may provide a 9 inch plus
clearance on either side the bridge span, or a total clearance of
approximately 14 to 15 feet (e.g. 14.5 feet), the centers of gantry
legs laterally spanning approximately 15 to 16 feet (e.g. 15.5
feet) and supported on support beams (alternatively termed tie
beams) of approximately 16 feet in length. The gantry may have a
narrower footprint than the pre-installation conveyance system (and
the spreader beam on top of vehicles of the gantry conveyance
system may be a lateral length sufficient to allow the straps to
hang vertically and freely about the gantry when connected to the
bridge span (e.g. approximately 7 feet).
[0460] Strictly by way of example, a bridge span of approximately
125-150 tons and 90-110 feet in length may be supported by a gantry
of 140-160 feet in length supported by four hydraulically powered
leg portions operating to lift a combined weight lift of
approximately 300 tons (combined weight of bridge span, gantry and
gantry conveyance system).
[0461] According to one aspect the invention is directed to use of
a gantry installation in which the bridge span is suspended in the
horizontal transport plane under safe wind conditions e.g. in which
the wind speed is preferably less than 30 km/hour.
[0462] It will be appreciated that each embodiment of the
invention(s) described herein has application to the various
aspects of the invention including method, system, gantry assembly
installation and gantry assembly. Therefore, save for method steps
involving a particular action, each embodiment shall be considered
to have general application to each aspect of the invention and
each other embodiment. Method steps shall have application to the
use of a gantry assembly installation, gantry assembly and system
as variously defined herein for removing an existing bridge span or
installing a replacement bridge span in its place, or both e.g. to
a use in accordance with any embodiment of the method.
[0463] While the above description constitutes a plurality of
embodiments of the present invention, it will be appreciated that
the present invention is susceptible to further modification and
change without departing from the fair meaning of the accompanying
claims.
* * * * *