U.S. patent application number 11/746464 was filed with the patent office on 2007-09-27 for pipelayer and method of loading pipelayer or excavator for transportation.
Invention is credited to Daniel E. Davis.
Application Number | 20070221600 11/746464 |
Document ID | / |
Family ID | 39367063 |
Filed Date | 2007-09-27 |
United States Patent
Application |
20070221600 |
Kind Code |
A1 |
Davis; Daniel E. |
September 27, 2007 |
PIPELAYER AND METHOD OF LOADING PIPELAYER OR EXCAVATOR FOR
TRANSPORTATION
Abstract
Embodiments of the present invention generally relate to a
pipelayer and a method for of loading a pipelayer or excavator for
transportation. One embodiment includes a method for transporting a
pipelayer or excavator from a first work site to a second worksite
via a public road. The method includes acts of: raising the
pipelayer or excavator off of track shoes of the pipelayer or
excavator; removing a first track assembly from the pipelayer or
excavator using a boom of the pipelayer or a boom assembly of the
excavator; loading the first track assembly onto a first trailer of
a first tractor-trailer using the boom of the remaining pipelayer
or the boom assembly of the remaining excavator; removing the
second track assembly from the pipelayer using the boom of the
remaining pipelayer or the boom assembly of the remaining
excavator; and loading the second track assembly onto the first
trailer using the boom of the remaining pipelayer or the boom
assembly of the remaining excavator.
Inventors: |
Davis; Daniel E.; (San
Benito, TX) |
Correspondence
Address: |
PATTERSON & SHERIDAN, L.L.P.
Suite 1500
3040 Post Oak Blvd.
Houston
TX
77056
US
|
Family ID: |
39367063 |
Appl. No.: |
11/746464 |
Filed: |
May 9, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11125691 |
May 10, 2005 |
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11746464 |
May 9, 2007 |
|
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PCT/US03/07613 |
Mar 11, 2003 |
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11125691 |
May 10, 2005 |
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Current U.S.
Class: |
212/270 ;
212/238; 903/904; 903/908 |
Current CPC
Class: |
B66C 23/44 20130101;
F16L 1/06 20130101; E02F 9/18 20130101; E02F 9/003 20130101; B66C
23/365 20130101; B66C 23/36 20130101 |
Class at
Publication: |
212/270 ;
212/238; 903/904; 903/908 |
International
Class: |
B66C 9/00 20060101
B66C009/00 |
Claims
1. A method for transporting a pipelayer or excavator from a first
work site to a second worksite via a public road, comprising acts
of: raising the pipelayer or excavator off of track shoes of the
pipelayer or excavator; removing a first track assembly from the
pipelayer or excavator using a boom of the pipelayer or a boom
assembly of the excavator; loading the first track assembly onto a
first trailer of a first tractor-trailer using the boom of the
remaining pipelayer or the boom assembly of the remaining
excavator; removing the second track assembly from the pipelayer
using the boom of the remaining pipelayer or the boom assembly of
the remaining excavator; and loading the second track assembly onto
the first trailer using the boom of the remaining pipelayer or the
boom assembly of the remaining excavator.
2. The method of claim 1, further comprising: backing a second
trailer of a second tractor-trailer underneath the remaining
pipelayer or excavator; and lowering the remaining pipelayer or
excavator onto the second trailer.
3. The method of claim 2, further comprising transporting the
pipelayer or the excavator to the second worksite using only the
two tractor-trailers.
4. The method of claim 2, further comprising: removing the boom
and/or a counterweight of the pipelayer or excavator from the
remaining pipelayer or excavator; and loading the boom and/or the
counterweight onto a third trailer of a third tractor-trailer.
5. The method of claim 4, wherein the counterweight is removed and
loaded and removing and loading the counterweight comprises
operating a piston and cylinder assembly of the pipelayer or
excavator.
6. The method of claim 2, further comprising hitching a stinger
trailer to the second trailer.
7. The method of claim 1, wherein raising the pipelayer or
excavator comprises operating outriggers of the pipelayer or
excavator.
8. The method of claim 1, wherein the pipelayer or excavator is the
pipelayer.
9. The method of claim 10, wherein the pipelayer comprises: an
undercarriage, comprising: a lower frame; two track assemblies,
each track assembly, comprising: a track frame removably attached
to the lower frame; and a track shoe supported by the track frame
so that the track shoe may move around the track frame; a main
assembly supported by the undercarriage so that the main assembly
may rotate relative to the undercarriage, the main assembly
comprising: a main frame; and the boom pivoted to the main
frame.
10. The method of claim 1, wherein the pipelayer or excavator is
the excavator.
11. The method of claim 10, wherein removing each track assembly
uses a boom of the boom assembly and loading each track assembly
uses a stick of the boom assembly.
12. The method of claim 10, wherein removing each track assembly
uses a winch attached to the boom assembly.
13. The method of claim 10, further comprising folding a stick of
the boom assembly underneath a boom of the boom assembly.
14. The method of claim 1, wherein raising the pipelayer or
excavator comprises operating a jack of a second trailer.
15. The method of claim 14, further comprising: removing a
gooseneck from a front end of the second trailer; driving the
pipelayer or excavator over the second trailer via the front end;
and reattaching the gooseneck to the front end of the second
trailer.
16. A pipelayer, comprising: an undercarriage, comprising: a lower
frame; two track assemblies, each track assembly, comprising: a
track frame removably attached to the lower frame; and a track shoe
supported by the track frame so that the track shoe may move around
the track frame; a main assembly supported by the undercarriage so
that the main assembly may rotate relative to the undercarriage,
the main assembly comprising: a main frame; and a boom pivoted to
the main frame.
17. The pipelayer of claim 16, further comprising an adaptor
removably attached to the main frame, wherein the boom is pivoted
to the adaptor.
18. The pipelayer of claim 16, further comprising a winch attached
to the boom.
19. The pipelayer of claim 16, wherein the boom is an A-frame.
20. The pipelayer of claim 19, wherein the boom is asymmetric.
21. The pipelayer of claim 16, further comprising: a winch; a cable
operatively connected to the winch; and a pulley block operatively
connected to the cable and pivoted to the boom.
22. The pipelayer of claim 21, wherein the pivot between the pulley
block and the boom is a hinge.
23. The pipelayer of claim 21, further comprising a load block
operatively connected to the cable.
24. The pipelayer of claim 16, further comprising a piston and
cylinder assembly pivoted to the boom and pivoted to the main
frame.
25. A method of using the pipelayer of claim 16, comprising:
lifting a pipe using the pipelayer; rotating the pipe about a
radius using the pipelayer; and lowering the pipe into a trench
using the pipelayer.
26. A method of using the pipelayer of claim 17, comprising:
removing the adaptor and the boom; and attaching an excavator boom
or a crane boom to the main frame.
27. The pipelayer of claim 16, further comprising a cab attached to
the main frame, wherein an operator's field of vision to a front, a
left, and a right side is unobstructed when an operator is seated
in the cab.
28. The pipelayer of claim 16, further comprising an outrigger
pivoted to the lower frame, the outrigger operable to extend into
contact with the ground to support the pipelayer.
29. The pipelayer of claim 28, wherein the outrigger comprises: a
first arm pivoted to the lower frame and operable between a first
position along the lower frame and a second position extending from
the lower frame; and a second arm operable between a first position
retracted in the first arm and a second position extended from the
first arm.
30. The pipelayer of claim 29, wherein the outrigger further
comprises: a third arm operable between a first position retracted
in the second arm and a second position extended from the second
arm; and a pad pivoted to the third arm.
31. The pipelayer of claim 16, further comprising a track motor
attached to the track frame, wherein the track shoe is operatively
connected to the track motor.
32. The pipelayer of claim 16, further comprising an engine
attached to the main frame.
33. The pipelayer of claim 32, wherein the engine is a
diesel-electric hybrid.
34. The pipelayer of claim 32, wherein the engine is a hydrogen
fuel-cell.
35. The pipelayer of claim 16, wherein a length of the lower frame
is substantially equal to or less than a width of a standard
trailer of a tractor-trailer.
36. The pipelayer of claim 16, wherein a width of the lower frame
is greater than a width of a standard trailer of a
tractor-trailer.
37. The pipelayer of claim 16, wherein a width of the undercarriage
is not variable.
38. The pipelayer of claim 16, wherein: the removable attachment
between the track frame and the lower frame comprises a lug and a
bracket assembly, the lug comprises a hook and a hole, the lug is
attached to one of the track frame and the lower frame, the bracket
assembly is attached to the other of the track frame and the lower
frame, and the bracket assembly comprises a first fastener which
receives the hook and a second removable fastener disposed through
the hole.
39. The pipelayer of claim 16, further comprising: a winch attached
to the main frame; and a cable operatively connected to the winch
and to the boom at an end of the boom distal from the pivot between
the boom and the main frame so that operation of the winch will
raise or lower the boom.
40. The pipelayer of claim 16, wherein a rectangular inner
footprint is defined by inner sides of the track shoes and the
pivot between the boom and the main frame is located within the
inner footprint.
41. The pipelayer of claim 40, wherein the pivot between the boom
and the main frame is located within the inner footprint at any
rotational orientation of the main frame relative to the
undercarriage.
42. The pipelayer of claim 16, wherein: the boom is pivoted to a
first side of the main frame, and the main assembly further
comprises a counterweight removably attached to a second side of
the main frame, the second side opposite the first side.
43. The pipelayer of claim 42, further comprising: a piston and
cylinder assembly (PCA) pivoted to the main frame and pivoted to
the counterweight, wherein the PCA is operable between a first
position where the counterweight is removably attached to the
second side of the main frame and a second position where the
counterweight is seated on the ground.
44. The pipelayer of claim 43, further comprising: a head pivoted
to the counterweight; a first pair of arms pivoted to the main
frame and the head; a second pair of arms pivoted to the main frame
and the head, wherein the PCA is pivoted to the counterweight via
the head.
45. The pipelayer of claim 42, wherein the counterweight has a
recess formed therein and the PCA is disposed in the recess when
the PCA is in the first position.
46. The pipelayer of claim 42, further comprising a proximity
sensor operable to verify that the counterweight is in the first
position.
47. A method of using a pipelayer, comprising acts of: providing a
pipelayer; removing a counterweight of the pipelayer; and operating
the pipelayer on a steep grade without the counterweight.
48. The method of claim 47, wherein removing the counterweight
comprises operating a piston and cylinder assembly of the
pipelayer.
49. The method of claim 47, wherein a weight of an undercarriage of
the pipelayer has been increased to compensate for removal of the
counterweight.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of U.S. patent
application Ser. No. 11/125,691, filed May 10, 2005, which is a
continuation-in-part (petition pending) of International
Application No. PCT/US2003/007613, filed Mar. 11, 2003.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] Embodiments of the present invention generally relate to a
pipelayer and a method for of loading a pipelayer or excavator for
transportation.
[0004] 2. Description of the Related Art
[0005] FIG. 1 is a front view of a prior art pipelayer 10. The
pipelayer 10 is typically used for the construction of underground
pipelines which transport hydrocarbons, such as natural gas or
gasoline. Typical operation of the pipelayer includes raising,
carrying, and lowering heavy pipe 12. The pipelayer 10 is a crawler
or tractor-type vehicle having a maneuverable boom 42 disposed on a
side thereof. For this reason, the pipelayer 10 is referred to as a
sideboom.
[0006] The pipelayer 10 further includes a main frame assembly 14
having first and second opposed sides 16 and 18 and a radiator
guard 20. The pipelayer 10 includes first and second endless
self-laying track assemblies 22, 24, with each of the track
assemblies 22, 24 having a roller frame. A rigid cross bar 28 and a
pivot shaft connect each track assembly 22, 24 to a respective side
16, 18 of the main frame assembly 14. A pipelayer frame 32 has a
first portion 34 secured to the main frame assembly 14 and a second
portion 36 secured to one of the roller frames by a plurality of
fasteners. The first portion 34 is joined to the second portion 36
by a pin arrangement 40. The boom arm 42 has a first end portion
44, pivotally connected to the pipelayer frame second portion 36,
and a second end portion 46 supporting a cable operated load block
assembly 48. A drawworks 50 runs a cable 52 in and out to raise and
lower the block assembly 48 and the pipe 12. A fluid operated
cylinder 54 has a first end portion 56 connected to the pipelayer
frame 32 and a second end portion 58 releasably connected to the
boom arm second end portion 46. A counterweight 55 is attached to
the main frame 14. The counterweight 55 may also be secured to one
of the roller frames by a counterweight frame (not shown) similar
to the pipelayer frame 32.
[0007] The boom arm 42 of the pipelayer 10 cannot rotate without
driving the track assemblies 22, 24. To deliver a piece of pipe
from the pipe delivery vehicle located on an opposite side of the
pipelayer relative to the pipeline trench, the pipelayer would have
to drive the track assemblies 22, 24 in order to turn 180 degrees
so that the boom would face the pipe delivery vehicle, pick up the
pipe, and drive the track assemblies 22, 24 in order to turn 180
degrees so that the boom arm 42 would face the trench in order to
deliver the piece of pipe.
[0008] Further, the pipelayer 10 is a specialized vehicle. It is
not configured to perform other jobs at a pipeline work site, such
as excavation. When pipelaying duties are complete, the pipelayer
may idle in a yard until required again, which may be a substantial
period of time.
[0009] The boom arm 42, the pipelayer frame 32, and the
counterweight frame increase the width of the pipelayer 10 versus
traditional crawlers. This increased width causes difficulty in
transporting the pipelayer from one work site to another over
public roads as the increased width means that the pipelayer will
not fit on a standard trailer without requiring permits and/or
pilot vehicles which increase the expense associated with
transportation. Alternatively, the boom arm 42, the pipelayer frame
32, the counterweight 55, and the counterweight frame of the
pipelayer 10 may be removed for transportation. However, this
substantial disassembly of the pipelayer 10 increases the labor and
thus also increases transportation costs.
[0010] Therefore, there exists a need in the art for a pipelayer
that facilitates the pipelaying operation, may be used for other
purposes, and/or possesses the ability to be transported via public
roads with minimal disassembly.
SUMMARY OF THE INVENTION
[0011] Embodiments of the present invention generally relate to a
pipelayer and a method for of loading a pipelayer or excavator for
transportation. One embodiment includes a method for transporting a
pipelayer or excavator from a first work site to a second worksite
via a public road. The method includes acts of: raising the
pipelayer or excavator off of track shoes of the pipelayer or
excavator; removing a first track assembly from the pipelayer or
excavator using a boom of the pipelayer or a boom assembly of the
excavator; loading the first track assembly onto a first trailer of
a first tractor-trailer using the boom of the remaining pipelayer
or the boom assembly of the remaining excavator; removing the
second track assembly from the pipelayer using the boom of the
remaining pipelayer or the boom assembly of the remaining
excavator; and loading the second track assembly onto the first
trailer using the boom of the remaining pipelayer or the boom
assembly of the remaining excavator.
[0012] Another embodiment includes a pipelayer. The pipelayer
includes an undercarriage and a main assembly supported by the
undercarriage so that the main assembly may rotate relative to the
undercarriage. The undercarriage includes a lower frame and two
track assemblies. Each track assembly includes a track frame
removably attached to the lower frame and a track shoe supported by
the track frame so that the track shoe may move around the track
frame. The main assembly includes a main frame and a boom pivoted
to the main frame.
[0013] Another embodiment includes a method of using a pipelayer.
The method includes acts of: providing a pipelayer; removing a
counterweight of the pipelayer; and operating the pipelayer on a
steep grade without the counterweight.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] So that the manner in which the above recited features of
the present invention can be understood in detail, a more
particular description of the invention, briefly summarized above,
may be had by reference to embodiments, some of which are
illustrated in the appended drawings. It is to be noted, however,
that the appended drawings illustrate only typical embodiments of
this invention and are therefore not to be considered limiting of
its scope, for the invention may admit to other equally effective
embodiments.
[0015] FIGS. 2-6 are various views of a pipelayer, according to one
embodiment of the present invention.
[0016] FIG. 2 illustrates a perspective view of the pipelayer,
wherein a longitudinal axis L.sub.mf of the main assembly is
perpendicular to a longitudinal axis L.sub.uc of the undercarriage.
FIG. 2A is a schematic illustrating a configuration of the
pipelayer so that the boom pivot is within both a rectangular
footprint and a rectangular tipping fulcrum of the pipelayer.
[0017] FIG. 3 illustrates another perspective view of the
pipelayer, wherein the longitudinal axis L.sub.mf of the main
assembly is parallel to a longitudinal axis L.sub.uc of the
undercarriage.
[0018] FIG. 4 illustrates another perspective view of the
pipelayer, wherein the longitudinal axis L.sub.mf of the main
assembly is parallel to a longitudinal axis L.sub.uc of the
undercarriage.
[0019] FIG. 5 illustrates an orthogonal view of the pipelayer,
wherein the longitudinal axis L.sub.mf of the main assembly is
perpendicular to a longitudinal axis L.sub.uc of the
undercarriage.
[0020] FIG. 6 illustrates another orthogonal view of the pipelayer,
wherein the longitudinal axis L.sub.mf of the main assembly is
parallel to a longitudinal axis L.sub.uc of the undercarriage.
[0021] FIGS. 7-12 illustrate acts of a method for partially
disassembling the pipelayer and loading the pipelayer on two
tractor-trailers (only trailer shown) for transporting the
pipelayer between jobs, according to another embodiment of the
present invention.
[0022] FIG. 7 illustrates the outriggers in the extended position
and one of the track assemblies loaded on a first trailer.
[0023] FIG. 8 illustrates the other one of the track assemblies
loaded on the first trailer.
[0024] FIG. 9 illustrates an act of backing the second trailer
underneath the remaining pipelayer.
[0025] FIG. 10 illustrates axles of the second trailer passing
underneath the remaining pipelayer.
[0026] FIG. 11 illustrates the remaining pipelayer loaded on the
second trailer.
[0027] FIG. 12 illustrates the boom and counterweight loaded on a
third trailer.
[0028] FIG. 13 illustrates a short pipe transporting act of the
pipelaying operation.
[0029] FIG. 14 illustrates a short pipe centering/joining act of
the pipelaying operation.
[0030] FIG. 15 illustrates long pipe centering/joining act of the
pipelaying operation.
[0031] FIG. 16 illustrates long pipe centering/joining act of the
pipelaying operation performed on a grade.
[0032] FIG. 17 is an orthogonal view of a pipelayer, according to
an alternative embodiment of the present invention.
[0033] FIGS. 18A-D illustrate a removable counterweight system
(RCW), according to another embodiment of the present invention.
FIG. 18A is a side view of the RCW in a first position where a
counterweight is engaged with the main frame. FIG. 18B is a side
view of the RCW in a second position where the counterweight is
dis-engaged with the main frame and set on the ground. FIG. 18C is
a front view of the counterweight. FIG. 18D is a section view of
FIG. 18C taken along line 18D-18D.
[0034] FIGS. 19-21 illustrate an excavator and acts of a method for
partially disassembling the excavator and loading the excavator on
two or more tractor-trailers for transporting the excavator between
work sites over public roads, according to another embodiment of
the present invention.
[0035] FIG. 19 illustrates the outriggers in the extended position
and a first act of loading one of the track assemblies on the first
trailer.
[0036] FIG. 20 illustrates a second act of loading one of the track
assemblies on the first trailer.
[0037] FIG. 21 illustrates the remaining excavator loaded on the
second trailer.
[0038] FIGS. 22 and 23 illustrate acts of a method for partially
disassembling the excavator (or pipelayer) and loading the
excavator on two or more tractor-trailers (only trailer shown) for
transporting the excavator between work sites over public roads,
according to another embodiment of the present invention.
[0039] FIG. 22 illustrates the excavator driven over the trailer
after a gooseneck of the trailer has been removed.
[0040] FIG. 23 illustrates the excavator lifted off the track shoes
by the gooseneck jack.
DETAILED DESCRIPTION
[0041] FIGS. 2-6 are various views of a pipelayer 100, according to
one embodiment of the present invention. The pipelayer 100 includes
a main assembly 150a mounted on an undercarriage 150b so that the
main assembly 150a may rotate relative to the undercarriage 150b.
FIG. 2 illustrates a perspective view of the pipelayer 100, wherein
a longitudinal axis L.sub.mf of the main assembly 150a is
perpendicular to a longitudinal axis L.sub.uc of the undercarriage
150b. FIG. 3 illustrates another perspective view of the pipelayer
100, wherein the longitudinal axis L.sub.mf of the main assembly
150a is parallel to a longitudinal axis L.sub.uc of the
undercarriage 150b. FIG. 4 illustrates another perspective view of
the pipelayer 100, wherein the longitudinal axis L.sub.mf of the
main assembly 150a is parallel to a longitudinal axis L.sub.uc, of
the undercarriage 150b. FIG. 5 illustrates an orthogonal view of
the pipelayer 100, wherein the longitudinal axis L.sub.mf of the
main assembly 150a is perpendicular to a longitudinal axis L.sub.uc
of the undercarriage 150b. FIG. 6 illustrates another orthogonal
view of the pipelayer 100, wherein the longitudinal axis L.sub.mf
of the main assembly 150a is parallel to a longitudinal axis
L.sub.uc of the undercarriage 150b.
[0042] The main assembly 150a includes a main frame 105, an
optional adaptor 110, a cab 115, a boom 120, a piston and cylinder
assembly 125, a winch 130, a pulley block 135, a load block 140, a
counterweight 145, and an engine 147. The main frame 105 has a
first side 105a and a second side 105b distal from the first side
105a. Attached to the first side 105a are the optional adaptor 110
and the operator's cab 115. Pivoted to the adaptor 110 at 120p is a
first longitudinal end of the boom 120. As used herein, the term
pivoted or pivot includes a single axis pivot, such as a hinge, and
a double axis pivot, such as a universal joint. The piston and
cylinder assembly (PCA) 125 is also pivoted to the adaptor 110 and
to the boom 120 so that extension of the PCA 125 will lower the
boom and retraction of the PCA will raise the boom 120. The adaptor
110 may be removably attached to the frame 110 to allow the boom
120 to be replaced with an excavator boom (not shown) or a crane
boom (not shown). Alternatively, the boom 120 may be directly
pivoted to the main frame 105.
[0043] Attached near the first longitudinal end of the boom 120 is
a winch 130. The winch 130 includes a drum having a cable 132 (only
partially shown) wrapped therearound. The drum is rotatable
relative to a housing of the winch. The drum may be driven by a
hydraulic motor (not shown). Pivoted to a second longitudinal end
of the boom 120 is a pulley block 135. Hung from the pulley block
135 by the cable 132 is a load block 140. Each of the blocks 135,
140 include a plurality of pulleys or sheaves. The cable 132
extends from the winch drum along the boom 120 and around the
sheaves of the pulley block 135 and load block 140 in order to
achieve a mechanical advantage. Unwinding of the cable 132 from the
drum lowers the load block 140 and winding of the cable 132 around
the drum raises the load block 140.
[0044] The boom 120 may be an A-frame and may include two primary
structural members 120a, b and two cross bars. The boom 120 may
also be asymmetric in that one of the primary structural members
120a may extend from the main frame 105 at a first angle relative
to a vertical axis that is less than a second angle relative to the
vertical axis at which the other one 120b of the primary structural
members extends from the main frame. The asymmetric design allows
better visibility for the operator and improves loading
characteristics of the boom as compared to a symmetric design. The
structural members 120a, b may be made from high strength steel
square tubing. Alternatively, the boom may be a symmetric A-frame
or include only a single structural member.
[0045] Attached to the second side 105b is a counterweight 145.
Housed in the second side 105b of the main frame is an engine 147.
The engine 147 may drive a hydraulic pump (not shown) and a
generator or alternator (not shown) for providing hydraulic or
electrical energy to components, such as the cab sensors, the PCA
125, and the winch 130. Associated hydraulic and electrical
circuitry (not shown) interconnecting these components may also be
provided. The engine may be a diesel engine or an alternative fuel
engine. Examples of alternative fuel engines include
diesel-electric hybrid and hydrogen fuel-cells. The diesel-electric
hybrid may use a smaller diesel engine and a bank of batteries (not
shown) which would allow operation of the pipelayer 100 without
operation of the diesel engine.
[0046] Rotation of the main assembly 150a relative to the
undercarriage 150b and support for the main assembly 150a by the
undercarriage 150b are provided by a rotary drive mechanism (not
shown) and a bearing 155. The rotary drive mechanism may include a
hydraulic or electric motor (not shown) attached to the main frame
and rotationally coupled to a pinion (not shown) which meshes with
a gear (not shown) rotationally coupled to the undercarriage 150.
Operation of the motor will cause the main assembly 150a to rotate
relative to the undercarriage 150b. The rotary drive mechanism may
further include a turn lock mechanism (not shown) for selectively
rotationally coupling the main assembly 150a relative to the
undercarriage 150b. The turn lock mechanism may include a gear
tooth (not shown) selectively engageable with the gear via
operation of a hydraulic cylinder or electic motor (not shown) and
a proximity switch to verify engagement of the tooth with the gear.
Engagement of the gear with the tooth rotationally couples the main
assembly 150a to the undercarriage 150b. Verification of engagement
by the proximity switch also prevents operation of the motor.
[0047] Alternatively, the turn lock mechanism may include a disk
(not shown) incorporated in the motor and a retaining mechanism for
retaining the disk. The turn lock mechanism is such that when the
rotary motor is stopped, the disk is retained by the retaining
mechanism to fix a rotor of the motor so as not to rotate, and when
the motor is started, the disk is hydraulically or electrically
disengaged from the motor, thereby freeing the rotor.
[0048] The cab 115 is includes walls, a ceiling, and windows to
protect the operator from weather conditions and allow visibility
for the operator. Placement of the cab 115 on the main frame 105a
may allow the operator unobstructed view to the front, left, and/or
right. The cab 115 further includes a seat (not shown), operating
instruments (not shown), and operating controls (not shown). The
cab may further include a load management system (LMS). The LMS is
a microprocessor based system and includes a variety of sensors in
communication with the microprocessor to calculate and display boom
angle, boom capacity, and/or the load on load block. The LMS may
include a database of boom capacities for various operating
positions and surface grades. The LMS may alert the operator, with
audio and/or visual warnings, when rated capacity is imminent,
reached, and/or exceeded.
[0049] The LMS may allow an operator to simulate a multi-position
pipelaying operation before performing the operation. The operator
may move the pipelayer through various expected positions of the
operation and note the load capacity at each position.
Alternatively, the LMS may be programmed to record the capacity at
each position and simulate the operation once the actual load is
known. The operator then may pick up the load and estimate whether
the load will exceed the load capacity at any of the expected
positions. If so, he may then re-configure the expected positions
until the load may be safely handled. The LMS may also warn the
operator of an impending two-block event (when the load block
contacts the pulley block).
[0050] The LMS system may also log a history of the lifts performed
by the pipelayer 100, and this data can be downloaded to a computer
for later analysis. The LMS may include an external, boom-mounted
light bar to provide a simple visual indicator of approximate load
on hook. The light bar may include a color scheme of lights. For
example, green lights mean the crane is under a light load, yellow
indicates a heavier load, and a red signals a high load condition.
The LMS may also monitor grade of the surface that the pipelayer is
operating on and calculate and display the proper load value that
corresponds to the grade. The LMS may communicate with an LMS of a
second pipelayer 100 and indicate the load distribution between the
two pipelayers for pipelaying operations performed in tandem. With
this information, the operators may coordinate activities to ensure
that an optimal load distribution is maintained.
[0051] The undercarriage 150b includes a lower frame 160 attached
to the bearing 155 and two track assemblies 175, each removably
attached to the lower frame 160. Each of the track assemblies 175
includes a track frame and one or more rollers 180a,b, such as
sprockets, operatively coupled to a track shoe or belt 185. The
track shoe 185 extends around the track frame and is movable
relative to the track frame. The rollers 180a, b are supported by
the track frame so that the rollers may rotate relative to the
track frame. One of the rollers 180a, b may be a drive sprocket and
the other an idler roller. A rotor of an electric or hydraulic
track motor (not shown) may be rotationally coupled to the drive
sprocket and a housing of the track motor may be attached to the
track frame. A conduit, such as an electrical cable or hydraulic
hose, may extend from the main frame 105 to the track motor. The
conduit may be connected to the track motor by a quick-connect
fitting. Operation of the track motor will cause movement of the
track shoe 185 relative to the track frame.
[0052] FIG. 2A is a schematic illustrating configuration of the
pipelayer 100 so that the boom pivot 120p is within a rectangular
outer footprint OFP, a rectangular tipping fulcrum TF, and a
rectangular inner footprint IFP of the pipelayer 100. The outer
footprint OFP is defined by outer sides of the track shoes 185. The
tipping fulcrum TF is defined by longitudinal centerlines of each
of the track shoes 185 and by longitudinal centerlines of the
rollers 180a, b. The inner footprint IFP is defined by inner sides
of the track shoes 185. Since the boom pivot 120p is within the
footprints OFP, IFP and the tipping fulcrum TF in the perpendicular
and parallel positions of FIGS. 5 and 6, then it is also within the
footprints and tipping fulcrum for any rotational position of the
main frame relative to the undercarriage (represented by the dashed
circle). Alternatively, the boom pivot 120p may be disposed between
the outer footprint OFP and the tipping fulcrum TF or the inner
footprint IFP and the tipping fulcrum TF.
[0053] FIGS. 7-12 illustrate acts of a method for partially
disassembling the pipelayer 100 and loading the pipelayer on two or
more tractor-trailers 200a-c (only trailer shown and gooseneck
removed for simplicity) for transporting the pipelayer 100 between
work sites over public roads, according to another embodiment of
the present invention. The trailers 200a-c may be standard lowboy
flatbed trailers. FIG. 7 illustrates outriggers 165 in the extended
position and one of the track assemblies 175 loaded on a first
trailer 200a. FIG. 8 illustrates the other one of the track
assemblies 175 loaded on the first trailer 200a.
[0054] To facilitate dis-assembly of the pipelayer 100 for
transport and re-assembly of the pipelayer 100 for delivery to the
next job site, each of the track assemblies 175 may include one or
more lugs 190 attached to the track frame. Each of the lugs 190 may
include a hook 190a and a hole 190b. Each of the lugs 190 is
received in an opening 195a of a bracket assembly 195 of the lower
frame 160. The bracket assembly 195 may include two plates 195d
spaced apart to define the opening 195a, each plate 195d attached
to the lower frame 160. Fasteners 195b, c (i.e., a bolt or a pin)
may each be disposed through corresponding holes in the plates
195d. To attach each track assembly 175 to the lower frame 160, the
fastener 195c is removed and the hook 190a is engaged with the
fastener 195b and the fastener 195c is then inserted through holes
in the plates 195d and the hole 190b and then locked to the track
frame (i.e. by a nut or a clip). The track conduit may then be
connected to the track motor by the quick-connect fitting.
Alternatively, the lug 190 may be attached to the lower frame 160
and the bracket assembly 195 may be attached to the track
frame.
[0055] Alternatively, each of the track motor housings may be
attached to the lower frame 160 and each rotor thereof rotationally
coupled to a respective drive roller via a removable shaft. The
shaft would be removably rotationally coupled at the track motor.
Alternatively, each of the track assemblies 175 may be attached to
the lower frame 160 by one or more telescoping axles (not shown).
The telescoping axles would extend to provide a wide footprint for
pipelaying operation and retract to provide a narrow footprint for
transportation.
[0056] To further facilitate dis-assembly for transport and
re-assembly for delivery of the pipelayer 100, one or more
outriggers 165 are selectively pivotal relative to the lower frame.
Each outrigger may include a first arm 165a, a second arm 165b, a
third arm 165c, and a pad 165d. The first arm 165a is selectively
pivotal relative to the lower frame 160. The second arm 165b is
selectively pivotal relative to the first arm and is retractable
within the first arm 165a. The third arm 165c is selectively
longitudinally coupled to the second arm 165b and is retractable
within the third arm 165c. The pad 165d is pivoted to the third arm
165c. The outriggers 165 are operable between an extended position
and a retracted position.
[0057] Starting from a retracted position (FIG. 2), the first arm
165a is pivoted from a retracted position against a side of the
lower frame 160 to an extended position about perpendicular to the
side of the lower frame 160. The first arm 165a may then be locked
into position. The second arm 165b is then extended from within the
first arm 165a. The second arm 165b may begin to pivot downward as
it is being extended or may be locked into a position parallel to
the first arm. When the second arm 165b is fully extended it either
pivots to a perpendicular position relative to the first arm 165a
or unlocked so that it may pivot to such a position. The second arm
165b is then locked into the perpendicular position. The third arm
165c and the pad 165d may then be extended from within the second
arm 165b. As the third arm 165c extends, the pad 165d will contact
the ground and begin to lift the pipelayer off of the track shoes
185. The arms 165 may be coordinated so that all of the arms
operate simultaneously. Once the third arm 165c is fully extended,
the third arm 165c may be locked into position. The outrigger 165
is then fully actuated.
[0058] The track assemblies 175 may then be removed. To operate the
outrigger 165 to the retraced position the above recited process is
reversed. Operation of the outrigger 165 may be fully automated and
controlled from the cab and/or wirelessly by a remote control (not
shown) so that the operator may view operation of the outrigger 165
from the ground. Automation of the outrigger 165 operation may be
accomplished by the provision of a hydraulic or electric motor or
piston (not shown) to pivot the first arm 165a and hydraulic or
electric lines (not shown) to actuate the second 165b and third
165c arms and the locking mechanisms.
[0059] The outriggers 165 are operated to lift the pipelayer 100
off of the track shoes 185. The fasteners 195c are removed. The
boom 120 and the load block 140 are used to lift the track assembly
175 from the lower frame 160. To accomplish this, the boom 120 may
be raised to a substantially vertical position and the load block
140 may be lowered to the track assembly 175 that is being removed.
The track assembly 175 may be prepared for loading by attaching a
clamp 250 that grasps edges of the track assembly 175 and has a
lifting lug for connection to the load block 140. Alternatively,
chains with hooks (not shown) could be used instead of the clamp
250. The load block 140 may be raised to lift the track assembly
175 from the lower frame 160. The boom 120 may then be lowered to
move the track assembly 175 over the trailer. The load block 140
may then be lowered to set the track assembly 175 onto the trailer
200a. Removal of the second track assembly 175 is similar to that
of the first track assembly 175 with the addition that the main
assembly 150a may be rotated so that the cab 115 faces the second
track assembly 175 and then rotated back after the second track
assembly 175 is secured so that the second track assembly 175 may
be placed on the trailer 200a. Alternatively, the trailer 200a may
instead be moved adjacent to the second track assembly 175.
[0060] FIG. 9 illustrates an act of backing the second trailer 200b
underneath the remaining pipelayer 100 (minus the two track
assemblies 175). FIG. 10 illustrates axles of the second trailer
passing underneath the remaining pipelayer 100. FIG. 11 illustrates
the remaining pipelayer 100 loaded on the second trailer. After the
track assemblies 175 have been removed and loaded on the first
trailer 200a, the second trailer 600b is aligned for backing up
underneath the remaining pipelayer 100. The second trailer 600b is
positioned so that a longitudinal axis of the trailer is
perpendicular to the longitudinal axis L.sub.uc of the
undercarriage 150b. This is because the length of the lower frame
160 may be equal to or less than or substantially equal to or less
than a width of the second trailer 200b whereas the width of the
lower frame 160 may be greater or substantially greater than the
width of the second trailer 200b. The main assembly 150a may be
oriented so that the cab 115 faces the second trailer 200b so that
the operator may view the second trailer 200b backing up.
Alternatively, the main assembly 150a may be oriented so that the
cab 115 faces away from the second trailer 200b and the operator
may exit the cab 115 and view the backing up of the trailer 200a
from the ground.
[0061] FIG. 10 illustrates axles of the second trailer 200bpassing
underneath the remaining pipelayer 100. Backing up of the second
trailer 200b then commences. The jack assemblies 165 provide
sufficient clearance for axles of the second trailer 200b to pass
underneath the remaining pipelayer 100. Before finishing the
backing up of the second trailer 200b, the main assembly 150a may
be rotated 180 degrees (or may already be in that position) so that
the truck operator may place the counterweight 145 or second side
105b of the main frame 105 in substantial vertical alignment with a
front end of the second trailer 200b (the end proximate the
tractor).
[0062] FIG. 11 illustrates the remaining pipelayer 100 loaded on
the second trailer 200b. Once the remaining pipelayer 100 is
aligned with the front end of the second trailer 200b, the jack
assemblies 165 are retraced until the lower frame 160 rests on the
second trailer 200b. The jack assemblies 165 may then be fully
actuated to the retracted position for transport. The boom 120 may
then be lowered to a horizontal or nearly horizontal position. The
boom 120 may hang over a rear end of the second trailer 200b. A
stinger or flip trailer 205 may be hitched to the rear end of the
second trailer 200b to contain the overhang (depending on the
length of the overhang and the local transportation laws).
Alternatively, a shorter boom may be used so that there is no
overhang. The pipelayer 100 may then be transported to another
worksite using the two tractor-trailers 200a, b.
[0063] FIG. 12 illustrates the boom and counterweight loaded on a
third trailer 200c. If, for example, the route to the next work
site crosses a load zoned bridge, it may be necessary to reduce the
weight of the second trailer 200b. The counterweight 145 and the
boom 120 may then be removed and transported on a third trailer
200c. Alternatively, the counterweight 145 and the boom 120 may be
removed prior to loading the remaining pipelayer 100 onto the
second trailer 200b. The stinger trailer 205 would not be used for
the second trailer 200b. As shown, the boom 120 is loaded with the
winch 130 facing the third trailer 200c and supporting the first
end of the boom 120. Alternatively, the boom 120 may be loaded with
the winch 130 facing away from the third trailer 200c and a block
(not shown) may be used to support the first end of the boom
120.
[0064] The PCA 125 may be left on the remaining pipelayer 100, may
be removed with the boom 120, or may be removed from both the boom
120 and the remaining pipelayer 100. If the PCA 125 is left on the
remaining pipelayer 100, a free end may be supported by a bracket
(not shown). If the PCA 125 is removed from both the boom 120 and
the remaining pipelayer 100, then it may be transported on either
the second 200b or the third trailer 200c. Alternatively, if the
adaptor 110 is used, the adaptor 110 and the boom 120 together
(disposing of the need to disassemble the PCA 125) may be loaded on
the third trailer 200c (with the counterweight 145) or the boom 120
may be separated from the adapter 110 and loaded as shown.
Alternatively, only one of the boom 120 and the counterweight 145
may be removed from the remaining pipelayer 100 and loaded on the
third trailer 200c.
[0065] FIGS. 13-16 illustrate a pipelaying operation using one or
more pipelayers 100, according to anther embodiment of the present
invention. FIG. 12 illustrates a short pipe transporting act of the
pipelaying operation. FIG. 13 illustrates short pipe
centering/joining act of the pipelaying operation. FIG. 14
illustrates long pipe centering/joining act of the pipelaying
operation. FIG. 15 illustrates a centering/joining act of the
pipelaying operation performed on a grade.
[0066] In the pipelaying operation, the following acts are
repeated: (a) short pipe transporting: short pipes 336 stacked on a
material handling vehicle 335 are moved to a place near a trench
337 and arranged in a line; (b) short pipe centering/joining: an
adequate number of short pipes 336, which have been aligned in the
place near the trench 337 by the short pipe transporting act, are
joined by welding into a long pipe 338; and (c) long pipe
centering/joining act: the long pipe 338 prepared by the short pipe
centering/joining act is joined by welding to the pipeline 339
under construction.
[0067] As shown in FIG. 13, a working field WF is formed in the
short pipe transporting operation on the right of the trench 337,
which has been dug. In the working field WF, a traveling space
RS.sub.1 for the pipelayer 100 and a traveling space RS.sub.2 for
the material handling vehicle 335 are arranged in this order from
the side of the dug trench 337, so that the pipelayer 100 and the
material handling vehicle 335 can travel together in an operating
direction parallel with the dug trench 337. After the
self-propulsion of the undercarriage 150b allows the pipelayer 100
to move the distance corresponding to the planned pitch of
alignment of the short pipes 336 in the operating direction, the
main assembly 150a turns about to take one of the short pipes 335
out of the material handling vehicle 335 and place it near the dug
trench 337. Each of the short pipes 336 are prepared for laying by
wrapping a sling T therearound. By repeating this operation, some
or all the short pipes 336 stacked on the material handling vehicle
335 are moved to and aligned in the place near the dug trench
37.
[0068] In the short pipe centering/joining act, as shown in FIG.
14, the short pipes 336 aligned in the place near the dug trench
337 are raised to a level suited for welding operation and the are
centered to make longitudinal axes of adjacent short pipes 336a,
336b coincident with each other. Centering of the short pipes 336
is performed by cooperation of a plurality of pipelayers 100 based
on an instruction from the hoistman HM.
[0069] In the long pipe centering/joining act, as shown in FIG. 15,
an end 338a of the long pipe 338 and an end 339a of the pipeline
339 under construction are raised to a level suited for welding
operation and centered to make longitudinal axes of the ends 338a,
339a coincident with each other. Centering of the ends 338a, 339a
is also performed by cooperation of a plurality of pipelayers 100
based on an instruction from the hoistman HM.
[0070] If either of the centering/joining acts is carried out on a
grade, these acts may proceed as shown in FIG. 16. The pivoted
pulley block 135 compensates for the grade, thereby maintaining a
portion of the cable 132 and the load block 140 aligned with a
direction of gravity G.
[0071] FIG. 17 is an orthogonal view of a pipelayer 400, according
to an alternative embodiment of the present invention. A second
winch 430 is used instead of the PCA 125 to hoist the boom 120. The
second winch 430 is attached to the adaptor 110 or directly to the
main frame 105 and includes a second drum having a second cable 432
wrapped therearound. The second drum is rotatable relative to a
second housing of the second winch 430. The second drum may be
driven by a hydraulic motor (not shown). Pivoted to the second
longitudinal end of the boom 120 is a first sheave block 435a. A
second sheave block 435b is pivoted to the second winch housing,
the adaptor 110, or directly to the main frame 105. Each of the
sheave blocks 435a, b includes a plurality of pulleys or sheaves.
The cable 132 extends from the second drum and around the sheaves
of the sheave blocks 435a, b in order to achieve a mechanical
advantage. Unwinding of the cable 432 from the second winch drum
lowers the boom 120 and winding of the cable 432 around the second
winch drum raises the boom 120. Loading of the pipelayer 400 is
similar to loading of the pipelayer 100. If the third trailer 200c
is used, the first sheave block 435a may simply be removed and
loaded on the second trailer 200b with the remaining pipelayer 400
(may depend on whether the adaptor 110 is used, see above). Usage
and loading of the pipelayer 400 is similar to usage and loading of
the pipelayer 100.
[0072] In another alternative embodiment, the winch 130 may be
attached to a modified adaptor instead of the boom 120, for
example, proximate to the cab 115. In another alternative
embodiment, the second winch 430 may be used instead of the PCA 125
to hoist the boom 120 and both the second winch 430 and the winch
130 may be attached to a modified adaptor, for example, proximate
to the cab 115. In another alternative embodiment, the winch 130
may be attached to the main frame 105 instead of the boom 120, for
example, proximate to the cab 115. In another alternative
embodiment, the boom may be longitudinally extended by adding a
second boom section (not shown) flanged to the boom 120. The flange
may include a hinge so that the second boom section may be folded
over the boom 120 for transportation.
[0073] In another alternative embodiment, a modified adaptor (not
shown) may be used having a first member pivoted to the first side
of the main frame and a second member pivoted to the second side of
the main frame, the two members also pivoted together. In a one
aspect of this alternative embodiment, the second winch 430 may be
used instead of the PCA 125 to hoist the boom 120 and the second
winch 430 may be attached to the one of the adaptor members
proximate to the pivot between the members. In another aspect of
this alternative embodiment, the winch 130 may be attached to the
one of the adaptor members proximate to the pivot between the
members instead of to the boom 120. In another aspect of this
alternative embodiment, the boom 120 may be pivoted to the first
adaptor member at a location midway along the adaptor member and
the PCA 125 may be pivoted to the adaptor member at the first side
of the main frame. In another aspect of this alternative
embodiment, a second winch may be used instead of the PCA 125 to
hoist the boom 120 and both winches 130, 430 may be located on the
adaptor members proximate to the pivot between the adaptor
members.
[0074] FIGS. 18A-D illustrate a removable counterweight system
(RCW) 500, according to another embodiment of the present
invention. FIG. 18A is a side view of the RCW 500 in a first
position where a counterweight 545 is removably attached to the
main frame 105 (at second side 105b). FIG. 18B is a side view of
the RCW 500 in a second position where the counterweight 545 is
removed from the main frame 105 and set on the ground. The
counterweight 545 is shown separately in FIGS. 18C-D for clarity.
FIG. 18C is a front view of the counterweight 545. FIG. 18D is a
section view of FIG. 18C taken along line 18D-18D.
[0075] The RCW 500 may be installed on the pipelayer 100 in lieu of
the counterweight 145. The RCW 500 may be hydraulically operated
between the first and second positions. The RCW 500 may be operated
from the cab 115 and/or from controls (not shown) located on the
main frame 105. The RCW 500 allows for quick, automated, and
independent removal of the counterweight 545 in instances where the
pipelayer 100 (or 400) will be operated on steep grades. During
steep grade operation, the counterweight 145/545 destabilizes the
pipelayer 100 in certain rotational orientations of the main
assembly 150a relative to the undercarriage 150b and/or loading
scenarios. Removal of the counterweight 545 allows more versatile
operation of the pipelayer 100 on steep grades. Alternatively or in
addition thereto, the weight of the lower frame 160 may be
increased by adding weights (not shown) or increasing the thickness
of structural members to compensate for removal of the
counterweight 545 and/or increase stability of the pipelayer 100 on
steep grades. Alternatively or in addition to using the RCW for
steep grade operation, the RCW 500 may be used to load the
counterweight 545 on the third trailer 200c (discussed above).
Alternatively, the pipelayer 100 may be operated on steep grades
without the RCW 500 by relying on the LMS to safely constrain
movement of the pipelayer 100 from unstable positions.
[0076] The RCW 500 may include a piston and cylinder assembly (PCA)
505, a base 510, a head 520, one or more front arms 525a, one or
more rear arms 525b, and the counterweight 545. The base 510 is
attached to the main frame 105 via lugs. One or more blocks (not
shown for clarity) may be attached to the main frame 105 proximate
to the base 510. The PCA 505 is pivoted to the main frame 105 via a
lug and pivoted to the head 520. The front arms 525a are pivoted to
the main frame 105 via lugs and pivoted to the head 520. The rear
arms 525b are pivoted to the main frame 105 via lugs and pivoted to
the head 520. One or more forks 515 are also pivoted to the head
520. The forks 515 allow the counterweight 545 to be pivoted to the
head 520 by receiving respective eyes 545e attached to the
counterweight 545. Once holes through the forks are aligned with
respective holes through the eyes 545e, pins (not shown) are
inserted through each fork and eye, thereby securing the
counterweight 545 to the head 520. The forks may 515 also be free
to rotate about their longitudinal axis.
[0077] The counterweight 545 includes a body having a recess 545r
formed therein, one or more blocks 545b attached thereto and
disposed in the recess 545r, and the eyes 545e attached thereto and
disposed in the recess. The eyes 545e may be attached to the body
via the blocks 545b. When the counterweight 545 is in the first
position, the PCA 505, the base 510, the arms 525a, b, and the
forks 515 may be disposed in the recess 545r. The head 520 may
extend upward out of the recess 545r or be disposed in the recess
545r as well.
[0078] Starting from the first position where the PCA 505 is fully
extended, retraction of the PCA 505 articulates the head 520 (and
the counterweight 545) horizontally away from the main frame 105
and vertically downward until the counterweight 545 is seated on
the ground. The front 525a and rear 525b arms support the head 520
as it articulates between the first and second positions. Once the
counterweight 545 is seated on the ground, the pins may be removed
and the head 520 may be returned to the first position to stow it
for pipelayer operation without the counterweight 545. To re-attach
the counterweight 545, the process is reversed. The head 520 is
articulated to the second position, the pins inserted, and the PCA
extended. Extension of the PCA articulates the head 520 (and the
counterweight 545) vertically upward and horizontally toward the
main frame 105 until bottoms of the blocks 545b are seated on the
base 510 and faces of the blocks 545b abut the base blocks. One or
more safety latch mechanisms (not shown) may be actuated (manually
or automatically) once the counterweight 545 is seated on the base
510. Further, a proximity sensor may be provided to verify that the
counterweight has properly seated.
[0079] FIGS. 19-21 illustrate an excavator 600 and acts of a method
for partially disassembling the excavator 600 and loading the
excavator on two or more tractor-trailers 200a-c (only trailer
shown and gooseneck removed for simplicity) for transporting the
excavator 600 between work sites over public roads, according to
another embodiment of the present invention. Acts similar to those
described above with reference to FIGS. 7-12 will not be repeated.
The excavator 600 may be the pipelayer 100 after the adapter 110
and the boom 120 have been removed and an excavator boom assembly
620 attached to the main frame 105. The excavator boom assembly 620
includes a boom 620a pivoted to the main frame 105 at a first end
thereof and an arm or stick 620b pivoted to the second end of the
boom 620a at a first end thereof. One or more first PCAs 625a are
pivoted to the main frame and pivoted to the boom 620a for
articulating the first boom to the main frame 105. A second PCA
625b is pivoted to the boom 620a and pivoted to the stick 620b for
articulating the stick 620b relative to the boom 620a. A bucket 640
is pivoted to the second end of the stick 620b. A third PCA 625c is
pivoted to the stick 620b and to the bucket 640 via a linkage for
articulating the bucket 640 relative to the stick 620b.
[0080] FIG. 19 illustrates the outriggers 165 in the extended
position and a first act of loading one of the track assemblies 175
on the first trailer 200a. FIG. 20 illustrates a second act of
loading one of the track assemblies on the first trailer 200a.
First and second eyes 690a, b are attached to the boom 620a and the
stick 620b, respectively. The second eye 690b is optional as an eye
located on the back of the bucket 640 may be used instead. Once the
track assembly 175 is ready to be removed, the boom assembly 620 is
articulated to the position shown and the clamp 250 is secured to
the first eye 690a with a cable. The boom assembly 620 is raised to
lift the track assembly 175 from the brackets 195. The track
assembly 175 will then swing away from the remaining excavator 600.
The boom assembly 620 may then be lowered and the track assembly
175 set on the ground. In this position, the boom assembly 620 may
then be articulated so the clamp 250 (and cable) may be secured to
the second eye 690b. Once the clamp 250 is secured to the second
eye 690b, the boom assembly 620 may be articulated to load the
track assembly 175 onto the first tractor-trailer 200a. The acts
may then be repeated to load the other track assembly 175 onto the
first tractor-trailer 200a (with the addition of rotating the main
assembly 150a about the undercarriage 150b).
[0081] Alternatively, a winch (not shown) may be attached to the
boom assembly 620 instead of the eyes 690a, b for hoisting the
track assemblies. The winch may be attached to the stick 620b near
the bucket 640. In this alternative, the clamp 250 would be
connected to the winch cable and the winch would then be operated
to lift and swing the track assembly over to the winch. The boom
assembly would then be articulated to lower the track assembly onto
the tractor trailer 200a.
[0082] FIG. 21 illustrates the remaining excavator 600 loaded on
the second trailer 200b. Once the track assemblies 175 have been
loaded on the first tractor trailer 200a, the remaining excavator
600 may be loaded onto the second tractor trailer 200b. The boom
assembly 620 may be articulated so that the arm 620b is folded
underneath the boom 620a. Since the stick 620b can be folded
underneath the boom 620a, the stinger trailer 205 is not required.
As discussed above with reference to FIG. 12, if it is necessary to
reduce the weight of the second trailer 200b, the counterweight 145
and/or the boom assembly 620 may be loaded on a third
tractor-trailer 200c.
[0083] FIGS. 22 and 23 illustrate acts of a method for partially
disassembling the excavator 600 (or pipelayer 100, 400) and loading
the excavator 600 on two or more tractor-trailers 200a-c (only
trailer shown) for transporting the excavator 600 between work
sites over public roads, according to another embodiment of the
present invention. FIG. 22 illustrates the excavator 600 driven
over the trailer 200b after a gooseneck 210 of the trailer has been
removed. FIG. 23 illustrates the excavator 600 lifted off the track
shoes 120 by a gooseneck jack 215.
[0084] In this embodiment, the excavator 600 or the pipelayer 100
may be loaded for transportation without requiring the outriggers
165. Instead of raising the excavator 600 or the pipelayer 100 off
of the track shoes using the outriggers 165, the gooseneck jack 215
is used. As shown, the boom assembly 620 is in the folded position;
however, the boom assembly may also be in the position illustrated
in FIGS. 19 and 20. The trailer 200b is removed from the tractor
and a front end of the trailer 200b set on the ground. The
gooseneck 210 of the trailer 200b is removed from a front end of
the trailer 200b. The excavator 600 or the pipelayer 100 is driven
over the trailer 200b via the front end and parked. Wood blocks may
be placed between the lower frame 160 and the trailer 200b. The
gooseneck 210 is reattached to the front end of the trailer 200b.
The jack 215 included with the gooseneck 210 is used to raise the
front end off the ground, thereby also raising the excavator 600 or
the pipelayer 100 off of the track shoes 120. The jack 215 may be
operated using one or more hydraulic lines (not shown) connected to
a hydraulic pump of the truck.
[0085] The weight may then be transferred from the gooseneck jack
215 to one or more jack stands (not shown). The lower frame 160 may
be chained down to the trailer 200b. Removal and loading of the
track assemblies 175 onto the trailer 200a may then proceed as
shown in FIGS. 19-20 or FIGS. 7-8 and as discussed above. The
trailer 200b may be attached to the tractor and the remaining
excavator 600 or the pipelayer 100 transported to the next worksite
using the trailer 200b (after folding the boom assembly 620 or
after lowering the boom 120 and hitching the stinger 205 (if
needed) as in FIG. 11). Alternatively, as discussed above, the boom
120, boom assembly 620, and/or the counterweight 145 may be removed
from the remaining excavator 600 or the pipelayer 100 and loaded on
the trailer 200c. Alternatively, a lowboy beam trailer (not shown)
may be used instead of a lowboy flatbed trailer.
[0086] While the foregoing is directed to embodiments of the
present invention, other and further embodiments of the invention
may be devised without departing from the basic scope thereof, and
the scope thereof is determined by the claims that follow.
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