CN112663519A - Construction method for replacing bridge support through multipoint synchronous jacking - Google Patents
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Abstract
The invention relates to the technical field of bridge support replacement, and provides a construction method for replacing a bridge support through multipoint synchronous jacking, which comprises the following steps: s1, removing the connecting pieces between the longitudinal direction and the transverse direction of the simply connected beam body; s2, installing a hydraulic synchronous jacking system; s3, debugging the hydraulic synchronous jacking system in a pre-jacking mode; s4, controlling a hydraulic synchronous jacking system to synchronously jack the beam body to a preset height; then arranging a temporary support on the cover beam; s5, dismantling the original bridge support; mounting the new bridge support to the pad stone; s6, removing the temporary support on the cover beam; and controlling the hydraulic synchronous jacking system to synchronously drop the beam body on the new bridge support. The method can realize the synchronous jacking and the synchronous beam falling of the beam body when the bridge support is replaced, avoid the generation of additional internal stress in the beam body, prevent the beam body from deforming or damaging, and ensure the service life and the safety of the bridge.
Description
Technical Field
The invention relates to the technical field of bridge support replacement, in particular to a construction method for replacing a bridge support through multipoint synchronous jacking.
Background
The service life of the design of the main structure of the bridge is generally tens to hundreds of years, but the service life of the bridge support system is far shorter than that of the main structure of the bridge due to the restriction of material performance, application environment and the like. Thus, aged or defective bridge support systems need to be replaced or repaired within the reasonable life span of the bridge.
At present, the conventional jacks are mainly adopted for replacing the bridge support to jack the beam body one by one, and then the support is directly replaced. The method is suitable for the bridge structure with the upper structure being the simply supported beam. However, for a bridge structure with a continuous beam as an upper structure, the method is difficult to control the jacking height of each support seat position, so that additional internal stress is generated in a beam body, the stress state of the support seats before and after construction is changed, the beam body is deformed or damaged, and the service life and safety of the bridge are further influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a construction method for replacing a bridge support through multipoint synchronous jacking, which can prevent a beam body from deforming or damaging when the bridge support is replaced for a bridge structure of which the upper structure is a continuous beam.
The technical scheme adopted by the invention for solving the technical problems is as follows: the construction method for replacing the bridge support by multi-point synchronous jacking comprises the following steps:
s1, removing the connecting pieces between the longitudinal direction and the transverse direction of the simply connected beam body; a batten or a steel corbel is arranged between the beam body and the stop block of the cover beam and is used as a transverse limiting facility of the beam body; wedge-shaped steel blocks are arranged at bridge deck expansion joints of adjacent beam bodies and serve as longitudinal limiting facilities of the beam bodies;
s2, installing a hydraulic synchronous jacking system;
mounting at least two hydraulic jacks on each cover beam, and connecting each hydraulic jack with a hydraulic pump station through a group of oil pipes; connecting a hydraulic pump station with a PLC control box through a pump station cable; mounting a displacement sensor on each hydraulic jack, and connecting each displacement sensor with a PLC control box through a sensor cable;
s3, after the hydraulic synchronous jacking system is installed, controlling the top of each hydraulic jack to be abutted against the bottom of the beam body; then debugging the hydraulic synchronous jacking system in a pre-jacking mode;
s4, after the hydraulic synchronous jacking system is debugged, controlling the hydraulic synchronous jacking system to synchronously jack the beam body to a preset height; then arranging a temporary support for temporarily supporting the beam body on the cover beam;
s5, after the arrangement of the temporary supporting pieces is completed, dismantling the original bridge support; when the pad stone on the cover beam is not defective, mounting the new bridge support onto the pad stone; when the pad stone on the bent cap has a defect, firstly repairing the defect of the pad stone, and then installing a new bridge support on the pad stone;
s6, after the new bridge support is installed, removing the temporary support on the cover beam; then controlling a hydraulic synchronous jacking system to synchronously drop the beam body on the new bridge support; and then the hydraulic synchronous jacking system is dismantled.
Further, in step S1, before the connecting member between the longitudinal and transverse directions of the simply connected girder is released, an operation platform is set up along the periphery of the pier, and the clearance height between the operation platform and the bottom of the girder is controlled to be 1.6-1.8 m.
Further, in step S2, two hydraulic jacks are mounted on each capping beam, and the two hydraulic jacks are symmetrically arranged between the two pads on the capping beam.
Further, in step S3, the hydraulic synchronous jacking system is debugged in a pre-jacking manner, including the following steps:
s3.1, sending a jacking instruction to the hydraulic pump station by the PLC control box; after the hydraulic pump station receives the jacking instruction, the hydraulic pump station sends oil to the hydraulic jacks through the oil inlet pipes so that all the hydraulic jacks synchronously pre-jack the beam body;
s3.2, when the displacement sensor monitors that the jacking height of the hydraulic jack reaches 3mm, the displacement sensor sends a signal that the jacking height reaches 3mm to the PLC control box; then the PLC control box sends a jacking stopping instruction to the hydraulic pump station and starts timing, when the hydraulic pump station receives the jacking stopping instruction, the hydraulic pump station stops oil supply, and an operator checks the hydraulic synchronous jacking system;
s3.3, when the timing of the PLC control box reaches 30min, the PLC control box sends a falling instruction to the hydraulic pump station; when the hydraulic pump station receives a falling instruction, the hydraulic pump station sends oil to the hydraulic jack through the oil return pipe to enable the beam body to fall synchronously;
s3.4, when the displacement sensor monitors that the falling height of the hydraulic jack reaches 3mm, the displacement sensor sends a signal that the falling height reaches 3mm to the PLC control box; then the PLC control box sends a falling stopping instruction to the hydraulic pump station; when the hydraulic pump station receives the falling stopping instruction, the hydraulic pump station stops oil delivery;
s3.5, repeating the steps S3.1-S3.4 at least once.
Further, in step S4, controlling the hydraulic synchronous jacking system to synchronously jack the beam body to a predetermined height, including the following steps:
s4.1, the PLC control box sends a jacking instruction to the hydraulic pump station; after the hydraulic pump station receives the jacking instruction, the hydraulic pump station sends oil to the hydraulic jacks through the oil inlet pipes so that all the hydraulic jacks synchronously pre-jack the beam body;
s4.2, monitoring the jacking height of the hydraulic jack through a displacement sensor, and when the hydraulic jack is jacked upwards by 3mm each time, sending a signal with the jacking height of 3mm to the PLC control box by the displacement sensor; when the total jacking height received by the PLC control box is greater than the preset height, the PLC control box sends a jacking stopping instruction to the hydraulic pump station; and when the hydraulic pump station receives the jacking stopping instruction, the hydraulic pump station stops oil delivery.
Further, in step S4, two temporary supports are disposed on each capping beam, and the pad on the capping beam is located between the two temporary supports.
Further, in step S5, when the pad stone on the bent cap has a crack defect, the concrete around the crack of the pad stone is chiseled, and then the steel bars are embedded and encapsulated by the steel plates to complete the repair of the crack defect on the pad stone.
The invention has the beneficial effects that:
according to the construction method for replacing the bridge support through multi-point synchronous jacking, disclosed by the embodiment of the invention, when the bridge support is replaced for the bridge structure of which the upper structure is the continuous beam, synchronous jacking and synchronous beam falling of the beam body can be realized, additional internal stress is avoided from being generated in the beam body, the problem that the stress state of the support before and after construction is changed due to the additional internal stress in the prior art is solved, the beam body is prevented from being deformed or damaged, and the service life and the safety of the bridge are ensured.
The construction method provided by the embodiment of the invention can synchronously lift the integral girder body at one time, thereby not only reducing the lifting times of the integral girder body and improving the construction efficiency, but also having less influence on the bridge deck structure and the attached facilities and saving the construction cost; due to the limiting measure in the jacking process, the displacement of the beam body in the horizontal direction in the jacking process is avoided, and the construction reliability is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below; it is obvious that the drawings in the following description are only some embodiments described in the present invention, and that other drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic structural diagram of an installed hydraulic synchronous jacking system in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a beam body after being jacked to a preset height by using the hydraulic synchronous jacking system in the embodiment of the invention;
FIG. 3 is a schematic structural view of an original bridge support after being removed;
FIG. 4 is a schematic view of the new bridge support after installation;
fig. 5 is a schematic structural diagram of a beam body falling on a new bridge bearing by using the hydraulic synchronous jacking system in the embodiment of the invention.
The reference numbers in the figures are: 1-beam body, 2-bent cap, 3-hydraulic jack, 4-hydraulic pump station, 5-control valve, 6-pump station cable, 7-PLC control box, 8-displacement sensor, 9-sensor cable, 10-temporary support, 11-original bridge support, 12-pad, 13-new bridge support, 14-oil inlet pipe, 15-oil return pipe and 16-junction box.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following further description is provided in conjunction with the accompanying drawings and examples. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
The construction method for replacing the bridge support through multipoint synchronous jacking provided by the embodiment of the invention comprises the following steps:
s1, removing the connecting pieces between the longitudinal direction and the transverse direction of the simply connected beam body 1; a batten or a steel corbel is arranged between the beam body 1 and the stop block of the bent cap 2 and is used as a transverse limiting facility of the beam body 1; wedge-shaped steel blocks are arranged at bridge deck expansion joints of adjacent beam bodies 1 and serve as longitudinal limiting facilities of the beam bodies 1;
s2, installing a hydraulic synchronous jacking system;
at least two hydraulic jacks 3 are arranged on each bent cap 2, and each hydraulic jack 3 is connected with a hydraulic pump station 4 through a group of oil pipes; a hydraulic pump station 4 is connected with a PLC control box 7 through a pump station cable 6; a displacement sensor 8 is arranged on each hydraulic jack 3, and each displacement sensor 8 is connected with the PLC control box 7 through a sensor cable 9;
s3, after the hydraulic synchronous jacking system is installed, controlling the top of each hydraulic jack 3 to be abutted against the bottom of the beam body 1; then debugging the hydraulic synchronous jacking system in a pre-jacking mode;
s4, after the hydraulic synchronous jacking system is debugged, controlling the hydraulic synchronous jacking system to synchronously jack the beam body 1 to a preset height; then arranging a temporary support 10 for temporarily supporting the beam body 1 on the cover beam 2;
s5, after the arrangement of the temporary supporting pieces 10 is completed, dismantling the original bridge support 11; when the pad stone 12 on the cover beam 2 is not defective, a new bridge support 13 is installed on the pad stone 12; when the pad stone 12 on the bent cap 2 has a defect, firstly repairing the defect of the pad stone 12, and then installing a new bridge support 13 on the pad stone 12;
s6, after the new bridge support 13 is installed, the temporary support 10 on the bent cap 2 is removed; then controlling the hydraulic synchronous jacking system to synchronously drop the beam body 1 on the new bridge support 13; and then the hydraulic synchronous jacking system is dismantled.
And step S1, mainly removing the constraint of the bridge deck and setting a limiting facility. Specifically, all longitudinal and transverse connections of the simply connected beam body 1, such as connecting pieces of a telescopic device, an anti-collision guardrail connecting steel bar, a bridge floor drain pipe and the like, are released according to actual conditions on site. In order to prevent the beam body 1 from generating transverse displacement in the jacking process, a batten or a mounting steel corbel is arranged between the beam body 1 and a stop block of the bent cap 2 and is used as a transverse limiting facility of the beam body 1; in order to prevent the beam body 1 from generating longitudinal displacement in the jacking process, a wedge-shaped steel plate is driven into the bridge deck expansion joint to serve as a longitudinal limiting facility of the beam body 1.
Before the connecting piece between the longitudinal direction and the transverse direction of the simply connected beam body 1 is removed, an operation platform is erected along the periphery of the bridge pier, and the clearance height between the operation platform and the beam bottom of the beam body 1 is controlled to be 1.6-1.8 m. And the operator carries out construction operation on the operation platform. For example, the work platform includes a scaffold erected along the periphery of a pier by using steel pipe fasteners, and a scaffold board laid on the top of the scaffold.
Step S2 is mainly to install a hydraulic synchronous jacking system. And calculating the counter force of each support by combining the actually measured and calculated data of the bridge deck load according to a design drawing or a completion drawing of the bridge construction period, and taking the counter force as a basis for selecting the hydraulic jack 3.
Referring to fig. 1, two hydraulic jacks 3 are mounted on each bent cap 2, and the two hydraulic jacks 3 on each bent cap 2 are symmetrically distributed between two cushion stones 12 on the bent cap 2; each hydraulic jack 3 is connected with a control valve 5 of a hydraulic pump station 4 through an oil inlet pipe 14 and an oil return pipe 15, and the hydraulic pump station 4 is connected with a junction box 16 of a PLC control box 7 through a pump station cable 6; a displacement sensor 8 is arranged on each hydraulic jack 3, and each displacement sensor 8 is connected with a junction box 16 of the PLC control box 7 through a sensor cable 9. The positions and the numbers of each hydraulic jack 3 and the displacement sensor 8 are recorded, so that the working state of each hydraulic jack 3 can be conveniently and intuitively known.
And step S3, after the hydraulic synchronous jacking system is installed, the hydraulic synchronous jacking system is debugged repeatedly until the hydraulic synchronous jacking system meets the construction requirements. Firstly, the top of each hydraulic jack 3 is controlled to be abutted against the bottom of the beam body 1 in a mode of arranging a sizing block at the bottom of the hydraulic jack 3; and then, a multi-time pre-jacking mode is adopted, so that the hydraulic synchronous jacking system is repeatedly checked and debugged in a load-holding state, and the stability and reliability of the hydraulic synchronous jacking system are ensured.
Adopting the mode of jacking in advance to right hydraulic pressure synchronous jacking system debugs, including the following step:
s3.1, the PLC control box 7 sends a jacking instruction to the hydraulic pump station 4; after the hydraulic pump station 4 receives the jacking instruction, the hydraulic pump station 4 sends oil to the hydraulic jacks 3 through the oil inlet pipe 14, so that all the hydraulic jacks 3 synchronously pre-jack the beam body 1;
s3.2, when the displacement sensor 8 monitors that the jacking height of the hydraulic jack 3 reaches 3mm, the displacement sensor 8 sends a signal that the jacking height reaches 3mm to the PLC control box 7; then the PLC control box 7 sends a jacking stopping instruction to the hydraulic pump station 4 and starts timing, when the hydraulic pump station 4 receives the jacking stopping instruction, the hydraulic pump station 4 stops oil supply, and an operator checks the hydraulic synchronous jacking system; carefully checking the oil circuit tightness, the stability of the hydraulic jack 3, the stability of the displacement sensor 8 and the like, and performing displacement and elevation monitoring until all indexes reach the expected effect;
s3.3, when the timing of the PLC control box 7 reaches 30min, the PLC control box 7 sends a falling instruction to the hydraulic pump station 4; when the hydraulic pump station 4 receives a falling instruction, the hydraulic pump station 4 sends oil to the hydraulic jack 3 through the oil return pipe 15, so that the beam body 1 falls synchronously;
s3.4, when the displacement sensor 8 monitors that the falling height of the hydraulic jack 3 reaches 3mm, the displacement sensor 8 sends a signal that the falling height reaches 3mm to the PLC control box 7; then the PLC control box 7 sends a falling stopping instruction to the hydraulic pump station 4; when the hydraulic pump station 4 receives the falling stopping instruction, the hydraulic pump station 4 stops oil delivery;
s3.5, repeating the steps S3.1-S3.4 at least once.
Step S4 is to synchronously lift the girder 1 to a predetermined height by a hydraulic synchronous lifting system so that the original bridge support 11 can be removed from the underside of the girder 1. Referring to fig. 2, after the girder 1 is lifted up to a predetermined height, a temporary support 10 for temporarily supporting the girder 1 is disposed on the capping girder 2; the temporary support 10 may be a frame structure welded by section steel. Preferably, two temporary supports 10 are arranged on each capping beam 2, and a bolster 12 on the capping beam 2 is located between the two temporary supports 10.
The hydraulic synchronous jacking system is controlled to synchronously jack the beam body 1 to a preset height, and the method comprises the following steps:
s4.1, the PLC control box 7 sends a jacking instruction to the hydraulic pump station 4; after the hydraulic pump station 4 receives the jacking instruction, the hydraulic pump station 4 sends oil to the hydraulic jacks 3 through the oil inlet pipe 14, so that all the hydraulic jacks 3 synchronously pre-jack the beam body 1;
s4.2, monitoring the jacking height of the hydraulic jack 3 through a displacement sensor 8, and when the hydraulic jack 3 jacks upwards for 3mm each time, sending a signal of which the jacking height is 3mm to the PLC control box 7 through the displacement sensor 8; when the total jacking height received by the PLC control box 7 is greater than the preset height, the PLC control box 7 sends a jacking stopping instruction to the hydraulic pump station 4; and when the hydraulic pump station 4 receives the jacking stopping instruction, the hydraulic pump station 4 stops oil delivery.
In step S5, when the temporary support 10 is completely arranged, the original bridge support 11 is removed, as shown in fig. 3. Then, the pad stone 12 on the bent cap 2 is inspected, and when the pad stone 12 is not defective, the mounting position of the new bridge bearing 13 is set out on the pad stone 12 by using ink lines, the mounting position of the new bridge bearing 13 should be kept as it is with the original design position, and then the new bridge bearing 13 is mounted on the pad stone 12, as shown in fig. 4.
When the pad stone 12 on the bent cap 2 has a defect, the defect on the pad stone 12 should be repaired, then the mounting position of the new bridge support 13 should be set out on the pad stone 12 by using ink lines, the mounting position of the new bridge support 13 should be kept as the original design position, and then the new bridge support 13 is mounted on the pad stone 12, as shown in fig. 4. For example, when the pad 12 on the bent cap 2 has a crack defect, the concrete around the crack of the pad 12 is chiseled, then the steel bars are planted, and the pad 12 is encapsulated and reinforced by the steel plate, so that the crack defect on the pad 12 is repaired.
In step S6, after the new bridge support 13 is installed, the temporary support 10 on the bent cap 2 is removed; and then controlling the hydraulic synchronous jacking system to synchronously drop the beam body 1 on the new bridge support 13, as shown in figure 5. Of course, before the beam is dropped, the clearance between each new bridge support 13 and the beam body 1 should be measured, and the clearance is used as the basis for the secondary processing of the leveling steel plate after the beam is dropped. After the beam falls, the hydraulic synchronous jacking system can be disassembled, and then the next working procedure is carried out.
According to the construction method for replacing the bridge support through multi-point synchronous jacking, disclosed by the embodiment of the invention, when the bridge support is replaced for the bridge structure of which the upper structure is the continuous beam, synchronous jacking and synchronous beam falling of the beam body can be realized, additional internal stress is avoided from being generated in the beam body, the problem that the stress state of the support before and after construction is changed due to the additional internal stress in the prior art is solved, the beam body is prevented from being deformed or damaged, and the service life and the safety of the bridge are ensured.
The construction method provided by the embodiment of the invention can synchronously lift the integral girder body at one time, thereby not only reducing the lifting times of the integral girder body and improving the construction efficiency, but also having less influence on the bridge deck structure and the attached facilities and saving the construction cost; due to the limiting measure in the jacking process, the displacement of the beam body in the horizontal direction in the jacking process is avoided, and the construction reliability is ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The construction method for replacing the bridge support through multipoint synchronous jacking is characterized by comprising the following steps:
s1, removing the connecting pieces between the longitudinal direction and the transverse direction of the simply connected beam body (1); a batten or a steel corbel is arranged between the beam body (1) and the stop block of the cover beam (2) and is used as a transverse limiting facility of the beam body (1); wedge-shaped steel blocks are arranged at bridge deck expansion joints of adjacent beam bodies (1) and are used as longitudinal limiting facilities of the beam bodies (1);
s2, installing a hydraulic synchronous jacking system;
at least two hydraulic jacks (3) are arranged on each bent cap (2), and each hydraulic jack (3) is connected with a hydraulic pump station (4) through a group of oil pipes; a hydraulic pump station (4) is connected with a PLC control box (7) through a pump station cable (6); a displacement sensor (8) is arranged on each hydraulic jack (3), and each displacement sensor (8) is connected with a PLC control box (7) through a sensor cable (9);
s3, after the hydraulic synchronous jacking system is installed, controlling the top of each hydraulic jack (3) to be abutted against the bottom of the beam body (1); then debugging the hydraulic synchronous jacking system in a pre-jacking mode;
s4, after the hydraulic synchronous jacking system is debugged, controlling the hydraulic synchronous jacking system to synchronously jack the beam body (1) to a preset height; then arranging a temporary support (10) for temporarily supporting the beam body (1) on the cover beam (2);
s5, after the arrangement of the temporary supporting pieces (10) is completed, dismantling the original bridge support (11); when the pad stone (12) on the cover beam (2) is not defective, a new bridge support (13) is installed on the pad stone (12); when the pad stone (12) on the cover beam (2) has a defect, firstly repairing the defect of the pad stone (12), and then installing a new bridge support (13) on the pad stone (12);
s6, after the new bridge support (13) is installed, removing the temporary support (10) on the bent cap (2); then controlling a hydraulic synchronous jacking system to synchronously drop the beam body (1) on the new bridge support (13); and then the hydraulic synchronous jacking system is dismantled.
2. The construction method for replacing a bridge support through multi-point synchronous jacking as claimed in claim 1, wherein in step S1, before the connection between the longitudinal direction and the transverse direction of the simply connected beam body (1) is released, a working platform is erected along the periphery of the bridge pier, and the clearance height between the working platform and the bottom of the beam body (1) is controlled to be 1.6-1.8 m.
3. The construction method for replacing the bridge support through multi-point synchronous jacking according to claim 1, wherein in the step S2, two hydraulic jacks (3) are mounted on each cover beam (2), and the two hydraulic jacks (3) are symmetrically arranged between two cushion stones (12) on the cover beam (2).
4. The construction method for replacing the bridge support through multipoint synchronous jacking according to claim 1, wherein in the step S3, the hydraulic synchronous jacking system is debugged in a pre-jacking mode, and the method comprises the following steps:
s3.1, sending a jacking instruction to the hydraulic pump station (4) by the PLC control box (7); after the hydraulic pump station (4) receives a jacking instruction, the hydraulic pump station (4) sends oil to the hydraulic jacks (3) through the oil inlet pipes (14) so that all the hydraulic jacks (3) can synchronously pre-jack the beam body (1);
s3.2, when the displacement sensor (8) monitors that the jacking height of the hydraulic jack (3) reaches 3mm, the displacement sensor (8) sends a signal that the jacking height reaches 3mm to the PLC control box (7); then the PLC control box (7) sends a jacking stopping instruction to the hydraulic pump station (4) and starts timing, when the hydraulic pump station (4) receives the jacking stopping instruction, the hydraulic pump station (4) stops oil supply, and an operator checks the hydraulic synchronous jacking system;
s3.3, when the timing of the PLC control box (7) reaches 30min, the PLC control box (7) sends a falling instruction to the hydraulic pump station (4); after the hydraulic pump station (4) receives the falling instruction, the hydraulic pump station (4) sends oil to the hydraulic jack (3) through the oil return pipe (15) to enable the beam body (1) to fall synchronously;
s3.4, when the displacement sensor (8) monitors that the falling height of the hydraulic jack (3) reaches 3mm, the displacement sensor (8) sends a signal that the falling height reaches 3mm to the PLC control box (7); then the PLC control box (7) sends a falling stopping instruction to the hydraulic pump station (4); when the hydraulic pump station (4) receives the falling stopping instruction, the hydraulic pump station (4) stops oil delivery;
s3.5, repeating the steps S3.1-S3.4 at least once.
5. The construction method for replacing the bridge support through multi-point synchronous jacking according to claim 1, wherein in the step S4, the step of controlling the hydraulic synchronous jacking system to synchronously jack the beam body (1) to a preset height comprises the following steps:
s4.1, sending a jacking instruction to the hydraulic pump station (4) by the PLC control box (7); after the hydraulic pump station (4) receives a jacking instruction, the hydraulic pump station (4) sends oil to the hydraulic jacks (3) through the oil inlet pipes (14) so that all the hydraulic jacks (3) can synchronously pre-jack the beam body (1);
s4.2, monitoring the jacking height of the hydraulic jack (3) through a displacement sensor (8), wherein when the hydraulic jack (3) jacks upwards for 3mm, the displacement sensor (8) sends a signal with the jacking height of 3mm to the PLC control box (7); when the total jacking height received by the PLC control box (7) is greater than the preset height, the PLC control box (7) sends a jacking stopping instruction to the hydraulic pump station (4); and when the hydraulic pump station (4) receives the jacking stopping instruction, the hydraulic pump station (4) stops oil delivery.
6. The construction method for replacing the bridge bearing through multi-point synchronous jacking according to claim 1, wherein in step S4, two temporary supports (10) are arranged on each cover beam (2), and the pad stone (12) on the cover beam (2) is positioned between the two temporary supports (10).
7. The construction method for replacing the bridge bearing through multi-point synchronous jacking according to claim 1, wherein in step S5, when the pad stone (12) on the cover beam (2) has a crack defect, the concrete around the crack of the pad stone (12) is chiseled off, then the steel bars are planted, and then the steel plates are used for wrapping, so that the repair of the crack defect on the pad stone (12) is completed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481882A (en) * | 2021-06-30 | 2021-10-08 | 重庆建工第三建设有限责任公司 | Bridge plate type rubber support and replacement construction method thereof |
| CN113622320A (en) * | 2021-09-16 | 2021-11-09 | 重庆市设计院有限公司 | Bridge jacking method based on 5G control |
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