U.S. patent application number 10/380225 was filed with the patent office on 2004-05-27 for method and device for correcting the position of a slab construction consisting of precast concrete slabs.
Invention is credited to Bogl, Stefan, Lindner, Erich, Reichel, Dieter, Schreiner, Ulrike.
Application Number | 20040099750 10/380225 |
Document ID | / |
Family ID | 26007043 |
Filed Date | 2004-05-27 |
United States Patent
Application |
20040099750 |
Kind Code |
A1 |
Reichel, Dieter ; et
al. |
May 27, 2004 |
Method and device for correcting the position of a slab
construction consisting of precast concrete slabs
Abstract
The invention relates to a method for correcting the position of
a slab construction, especially a solid carriageway for high-speed
vehicles, consisting of precast concrete slabs (1). The precast
slabs (1) are supported by a substrate made from hardenable
underpoured material (4) and a supporting layer (5) on the base. In
order to correct the person of at least one precast slab (1), the
precast slab (1) is at least partially detached from the
substructure, especially from the under poured material (4) and/or
the supporting layer (5), whereupon it is finely aligned and then
underpoured once more with said material (4). A separating device
(20.21) is arranged on a precast concrete slab (1) which is to be
detached on a successive precast concrete slab in a device provided
with one such separating device in order to detach at least one
part of a concrete slab (1) pertaining to a solid carriageway for
high speed vehicles from the substructure thereof, especially when
the position is corrected.
Inventors: |
Reichel, Dieter; (Neumarkt,
DE) ; Bogl, Stefan; (Sengenthal, DE) ;
Schreiner, Ulrike; (Puchheim, DE) ; Lindner,
Erich; (Auerbach-Nasnitz, DE) |
Correspondence
Address: |
Stephen E Bondura
Dority & Manning
P O Box 1449
Greenville
SC
29602-1449
US
|
Family ID: |
26007043 |
Appl. No.: |
10/380225 |
Filed: |
July 30, 2003 |
PCT Filed: |
August 18, 2001 |
PCT NO: |
PCT/EP01/09544 |
Current U.S.
Class: |
238/7 |
Current CPC
Class: |
E01B 29/04 20130101;
E01B 2204/06 20130101; E01B 2204/13 20130101 |
Class at
Publication: |
238/007 |
International
Class: |
E01B 001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 12, 2000 |
DE |
100 45 327.9 |
Dec 22, 2000 |
DE |
100 64 748.0 |
Claims
Claimed is:
1. A method for positional correction of a slab construction of
precast concrete slabs (1), especially for an existing carriageway
for high speed vehicles, wherein the precast concrete slabs (1) are
supported by an under construction of a hard curing undergrout (4)
and a carrier layer (5) of base fill, therein characterized, in
that for said positional correction of at least one precast
concrete slab (1), the said precast concrete slab (1) is at least
partially separated from the under construction, in particular,
from the undergrout (4), and/or from the carrier layer (5) and is
subsequently finely aligned, and then supplied anew with undergrout
(4).
2. A method in accord with claim 1, therein characterized in that
the under support, particularly the undergrout (4), is at least
partially separated.
3. A method in accord with one of the foregoing claims, therein
characterized in that the understructure, particularly the
undergrout (4), is separated in the longitudinal direction or in
the horizontal direction from the precast concrete slab (1).
4. A method in accord with one of the foregoing claims, therein
characterized, in that the undergrout (4) is essentially separated
at, or in proximity to, the contacting surface of the precast
concrete slab (1) and/or the carrying layer (5).
5. A method in accord with one of the foregoing claims, therein
characterized, in that the understructure, in particular the
undergrout, is separated over the complete breadth of the precast
concrete slab (1).
6. A method in accord with one of the foregoing claims, therein
characterized, in that before the separation of the understructure,
in particular, the undergrout (4), an opening is made in the
understructure, in particular the undergrout (4) for the insertion
of a separating means, in particular a saw blade.
7. A method in accord with one of the foregoing claims, therein
characterized, in that the separation line exhibits a length, which
is unequal to the length of a precast concrete slab (1), and
especially is not on the contact location where two precast
concrete slabs (1) abut.
8. A method in accord with one of the foregoing claims, therein
characterized, in that on the precast concrete slab (1), filling
openings (9) are opened or created and employed for the renewed
under-pouring.
9. A method in accord with one of the foregoing claims, therein
characterized, in that closed filling openings for the old
undergrout (4) are opened and made use of for renewed
undergrouting.
10. A method in accord with one of the foregoing claims, therein
characterized, in that the precast concrete slab (1) is exactly
aligned by especially mechanical or hydraulic lifting means, such
as spindles or lifting cushions, these means being placed inside
and/or outside the present concrete slab (1).
11. A method in accord with one of the foregoing claims, therein
characterized, in that before the separation, the spindles (7) are
removed from the from the area of said separating cut.
12. A method in accord with one of the foregoing claims, therein
characterized, in that the spindles (7) are replaced in their
support locations only after the separation.
13. A method in accord with one of the foregoing claims, therein
characterized, in that the precast concrete slab (1) is
undergrouted with an especially rapid-cure bitumen cement mortar, a
plastic, or a cement mortar.
14. A method in accord with one of the foregoing claims, therein
characterized, in that the understructure, especially the
undergrout (4) is separated by a saw, in particular a cable saw
(20), a chain saw, or blade saw.
15. A method in accord with one of the foregoing claims, therein
characterized, in that the understructure, especially the
undergrout (4) is separated by an oxygen lance.
16. A method in accord with one of the foregoing claims, therein
characterized, in that the understructure, especially the
undergrout (4) is separated by a high pressure water stream.
17. A method in accord with one of the foregoing claims, therein
characterized, in that the cut opening in the understructure is
cleaned before the renewed pour of grout.
18. A method in accord with one of the foregoing claims, therein
characterized, in that for the more rapid binding of the undergrout
(4), the pour location is heated.
19. A method in accord with one of the foregoing claims, therein
characterized, in that a complete precast concrete slab (1) can be
removed from the slab construction and replaced by an exchange
slab.
20. A device with a separation apparatus for the release of at
least one part of a precast concrete slab (1) of an existing
carriageway for rail guided, high speed, vehicles from its
understructure, especially in the case of a positional correction
in accord with one of the foregoing claims, therein characterized,
in that the separating apparatus (20, 21) is placed on the precast
concrete slab (1) which is to be loosened or on an adjacent
following precast concrete slab (1).
21. A device with a separating apparatus for the loosening from its
understructure of at least a part of a precast concrete slab (1) of
an existing carriageway for rail guided high speed vehicles,
especially in the case of a positional correction in accord with
the foregoing claims, therein characterized, in that the separation
device (20, 21) is placed on a guide structure independent of the
precast concrete slab (1) to be loosened, in particular on an
adjoining track.
22. A device in accord with the foregoing claim, therein
characterized, that the separating device (20, 21) cuts through the
understructure, especially the undergrout layer (4) placed beneath
the precast concrete slab (1).
23. A device in accord with one of the foregoing claims, therein
characterized, in that the precast concrete slabs (1) are bound
together.
24. A device in accord with one of the foregoing claims, therein
characterized, in that the separating apparatus (20) is placed on
the rails (2) of a first or second precast concrete slab (1).
25. A device in accord with one of the foregoing claims, therein
characterized, in that the separating apparatus (20) is part of an
assembly (20, 21) and within the said assembly (20, 21) exercises a
thrust in a longitudinal direction of the precast concrete slab
(1).
26. A device in accord with one of the foregoing claims, therein
characterized in that the separation apparatus (20) and/or the
assemble (20, 21) is guided on the rails (2).
27. A device in accord with one of the foregoing claims, therein
characterized, in that the assembly (20, 21) is secured to the said
rails (2), preferably, is clamped thereon.
Description
DESCRIPTION
[0001] The present invention concerns a method and a device for the
positional correction of slab construction of precast concrete
slabs, especially the slabs of a solid carriageway for high speed
vehicles, whereby the precast concrete slabs are underset with a
hard curing grout and are supported by a carrying layer of base
fill.
[0002] Known concrete slab construction projects with precast
concrete slabs are, among other applications, employed for existing
carriageways for high speed traffic vehicles. The high speed
vehicles are, in this present application, guided by rails. In
order to achieve operation which is free of disturbance and
comfortable on a high speed carriageway, it is necessary that the
rails, and therewith the slabs of the slab construction be laid
very exactly in regard to elevation and lateral dimensioning. The
positional correction of the rails is done, normally, by means of
known rail fastening systems as well as by means of interposing
shims of different thicknesses underneath the rails. In this way,
positional faults of the rail of the magnitude of about 30 mm can
be compensated for. The disadvantage of this is, that greater
corrections, which are frequently necessary when a subsidence of
the base fill occurs, cannot be adjusted with such corrective
measures, since such settling requires greater corrective
movements.
[0003] Thus the purpose of the present invention is, to make
possible a positional correction of a slab construction of precast
concrete slabs, which permits a greater elevation correction.
[0004] This purpose is achieved by the features of the Claim 1 as
well as the features of Claim 17.
[0005] In the method of the invention, a slab construction of
precast concrete, especially of an existing carriageway for high
speed vehicles, is corrected on site. The slab construction
possesses two precast slabs bound to each other, wherein the
precast slabs are set into a hard curing grout and are supported on
a carrying layer base fill. For the positional correction of at
least one precast slab, or a portion thereof, the said precast slab
is entirely or partially released from its grout setting, and/or
from its carrying layer, and is subsequently exactly realigned, and
then the cut is refilled anew with undergrout. This method can well
account for large corrections in elevation. The loosing, or
releasing, can be carried out either by chemical or by mechanical
means. The most advantageous method depends on the surrounding
conditions and the materials of the grout.
[0006] If the substructure, especially the undergrout and/or the
carrying layer, is cut through longitudinally and/or transversely,
then in a very simple manner, the loosening of the precast slab can
be carried out. The decision, as to whether the understructure
should be cut in a longitudinal or a transverse direction, is
dependent upon the kind of subsidence the slab has suffered, the
correction tools which are available, and the conditions of the
working environment.
[0007] If the grout material is cut through at (or near) the
contact area of the precast plate, and/or the if it is the carrying
layer which is cut through, then assurance can be made, that a
satisfactory grout entry and strong binding of the new grout to the
precast concrete slab will be made.
[0008] If, before the cutting of the understructure takes place,
particularly that of the grout, a boring is made in the said
understructure for the insertion of the cutting means, that being
especially a saw blade, then it is not necessary to cut through the
precast slab at the beginning of the separating cut of the
understructure.
[0009] If the line of the cut shows a length, which is unequal to
the length of the precast slab, and especially if said line does
not begin or end at the contact point of two precast slabs, a
possible weakness at the slab contact point is thereby avoided.
[0010] If, in the precast slab, grout feed openings are opened or
created and used for fresh grout, then the filling of the new
understructure grout is substantially eased. A filling of the grout
which is essentially free of air inclusions is thus enabled.
[0011] It is especially of advantage, if, closed up openings for
the old undergrout are opened and made use of for the new substrate
grout.
[0012] If the precast slab can be exactly aligned with integrally
placed mechanical or hydraulic lifting means already within said
slab, for instance, spindles, then it often becomes possible, in a
simple way, that these means, still available from the first
alignment can aid in the present alignment of the precast slab.
[0013] In order to avoid damage to the spindles by cutting through
the layer, it is of advantage, if the spindles are removed from the
area of the separation before the through-cut and only replaced in
their support position after the cut.
[0014] In order to restore travel operation as soon as possible on
the precast concrete slab, it is of advantage, if the precast
concrete slab is underlain with an especially fast-cure
bitumen-cement mortar, plastic or cement mortar.
[0015] A device in accord with the invention exhibits a separation
apparatus for the loosening, and especially for the through cutting
of an understructure, particularly the grout, placed beneath a
precast slab of a carriageway for track guided high speed
vehicles.
[0016] The existing carriageway consists mainly of at least one set
of a first and a second precast concrete slab bound together. The
cutting device is placed on the precast slab to be loosened, or on
an adjacently placed precast slab, or advantageously, on the
rails.
[0017] A further invented apparatus possesses a separating device
for the loosing of at least a part of a precast slab of an existing
carriageway for rail guided high speed vehicles from its
understructure. The separating device is on a guidance mechanism
independent of the precast slab to be loosened, and is particularly
well placed on the next rail. The existing carriageways are mostly
laid in double-track manner, so that the separating device can be
run on the next rail for the loosening of the required rail.
[0018] If the cutting device employs a self-moving power in the
longitudinal direction of the precast concrete slab, then, by a
fixed placement of an abutment for the cutting device, a relatively
long track stretch can be cut.
[0019] Advantageously, the separating device and/or the assembly
are guided on the rails. In this way, an exactly guided cut is
possible.
[0020] If the cutting assembly is firmly affixed on the rails, in
particular, clamped thereon, then a fast equipment relocation for
the lengthening of the separation cut is possible.
[0021] Further advantages of the invention are described in the
following embodiment examples. There is shown in:
[0022] FIG. 1 a plan view of a precast concrete slab,
[0023] FIG. 2 a cross-section through the construction of a
placement of a precast concrete slab,
[0024] FIG. 3 a section through the undergrout,
[0025] FIG. 4 a view of the lifting of the precast concrete
slab,
[0026] FIG. 5 the filling of the space between the lifted precast
concrete slab and the carrier layer, and
[0027] FIG. 6 an embodiment example of a cable saw.
[0028] In FIG. 1 is presented a top view of a precast concrete slab
1. The precast concrete slab 1 possesses a multiplicity of
projections, upon which the rails 2 are fastened. The rail
fastenings, which can be executed in numerous known ways, permit a
certain adjustment of the said rails in the vertical and horizontal
directions. Insofar these adjustment possibilities do not suffice,
for instance, because of the subsidence of the substructure, it
becomes necessary to upwardly adjust the precast concrete slab 1
itself. For this purpose, in the present embodiment, at six
positions are placed spindles 7, which serve for the adjustment of
the slab 1. The spindles 7, which are provided on the ends of the
slab 1 as well as in the middle thereof, by a more or less
difficult turning of the spindles 7 a fine adjustment of the slab 1
is achieved. These spindles 7, which normally are already installed
at the setting of the slab 1, obtain, by means of the present
invention, a second purpose, namely, in that they enable the
correction of the already set slab. The spindles are aligned as
matching, oppositely situated pairs.
[0029] FIG. 2 presents a cross-section through a construction of
the precast concrete slab 1 as well as showing the successive
strata. The precast concrete slab 1, surmounting an intermediate
layer of undergrout 4 is to be found on a carrier layer 5. The
carrier layer 5 can be, for example, hydraulically bound or
possibly an asphalt or another appropriate supporting layer. The
grout 4 binds the precast concrete slab 1 tightly to the carrier
layer 5. A spindle 7, which served for the alignment of the precast
concrete slab 1 at the first setting of the same, is presented in a
drawn down position, because it does not perform any load bearing
function for the precast concrete slab 1. The said spindle is
placed in a recess in the undergrout, so that it will be of service
in the future.
[0030] For the correction of the precast concrete slab 1, in accord
with FIG. 3, the undergrout layer 4 is shown as cut. By this means,
the precast concrete slab 1, after the undergrout 4 has been cut,
is now vertically movable, within the framework of its connections
in the slab construction. It is of exceptional value, if the cut in
the undergrout 4 is made directly at the dividing plane to the
precast concrete slab 1. By this means, a higher quality binding of
the new filling of undergrout, which is yet to be poured, with the
precast concrete slab 1 is assured. The old connection layer of the
undergrout 4 with the precast concrete slab 1 is, by this
operation, relieved of its previous carrying function and is bound
to the new layer. Advantageously, it is also possible to make the
separating cut between the carrier layer 5 and the undergrout 4.
Even in this case, a possibly loose connection can be renewed. The
separation at or in proximity to the connection location between
the precast concrete slab 1 and the undergrout is, in any case,
easier to carry out, since, when the known thickness of the precast
concrete slab 1 is at hand, this location is more simply determined
by means of an instrument and accordingly can be more exactly cut.
Although the thickness of the undergrout 4 can vary, this
connection location is simpler to capture than that of the
connection plane of the hydraulically bound carrier layer 5.
[0031] If the precast concrete slab 1 must be lowered, then a
square cross-sectional block of the undergrout is cut out and
subsequently the precast concrete slab 1 is allowed to drop into
the opening thereby formed.
[0032] In FIG. 4, the lifting of the precast concrete slab 1 is
shown. By the driving down of the spindle 7, and the corresponding
fine alignment of the precast concrete slab 1, the said slab is
raised away from the under support structure. The opening is, by
this action, made larger.
[0033] In FIG. 5, the precast concrete slab 1 is newly under filled
with grout. The undergrout is now in the cured state, so that the
spindle can again be relieved of the load.
[0034] In FIG. 6 is shown in sketch form, the arrangement of the
separating device on the precast concrete slab 1. The separating
device, which can be a cable saw, an oxygen lance, or other means,
can be carried on a movable slider 21. The slider 21 is drawn by
means of a cable winch over the location at which the precast
concrete slab 1 is to be cut. The winch, that is the cable, is
anchored at a fixed abutment. Advantageously, this abutment can be
placed on the adjacent precast concrete slab 1. As a guide for the
said slider 21, this function can be fulfilled by setting the
slider 21 on the rails which surmount the precast concrete slab 1.
Likewise, the rails 21 can serve for the fastening of the said
abutment. The abutment, in this case, is advantageously clamped to
the rails 21 and after the maximum travel of the slider 21 has been
expended, then the abutment itself can be moved ahead for a renewal
of the separating cut.
[0035] For a quicker cure of the new undergrout, especially in cold
weather, it is advantageous if the undergrout or the separation
opening is heated. In order to achieve a satisfactory connection to
the new undergrout, in any case, it is of advantage if the opening
is cleaned before the refill with a high pressure water stream. The
separation opening can also extend into the carrier layer, if the
new grout material is chosen to be compatible with the said carrier
layer to make a good bonding.
[0036] The present invention can also be employed for the
replacement of complete precast concrete slabs. The original slabs,
in this case, are completely removed from the interconnected
binding system and replaced by exchange slabs.
* * * * *