CN111851324A - Method for replacing bridge support - Google Patents
Method for replacing bridge support Download PDFInfo
- Publication number
- CN111851324A CN111851324A CN202010696795.XA CN202010696795A CN111851324A CN 111851324 A CN111851324 A CN 111851324A CN 202010696795 A CN202010696795 A CN 202010696795A CN 111851324 A CN111851324 A CN 111851324A
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- anchor rod
- bridge support
- seat plate
- old
- support
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a method for replacing a bridge bearing, which comprises the following steps: (1) designing and manufacturing a new bridge support and an embedding sleeve in advance; (2) the method comprises the following steps of (1) jacking a beam body after a nut for fastening an anchor rod is disassembled; (3) horizontally cutting the exposed upper anchor rods along the bottom surface of the upper seat plate of the old bridge support, then cushioning the lower seat plate of the old bridge support from the cushion stone, horizontally cutting the exposed lower anchor rods along the surface of the cushion stone after the cushion stone is separated, and sequentially taking down the intermediate body, the lower seat plate and the upper seat plate of the old bridge support after cutting; (4) the old bridge support is taken out, and then falls to the beam and is temporarily supported, a groove is formed in the anchor rod of the pad stone, and the excircle of the upper anchor rod and the excircle of the lower anchor rod are repaired; (5) and (5) installing a new bridge bearing. The invention is replaced under the condition of not changing the plane connecting position and height of the old bridge bearing, and the anchoring system of the old bridge bearing is fully utilized for anchoring connection after replacement, so that the structural strength and the anchoring strength of the bridge are not weakened, the replacement cost is effectively reduced, and the construction period is shortened.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a method for replacing a bridge support.
Background
The bridge support is an important support in a bridge structure, is commonly called as a joint of the bridge structure, and transfers various loads on the upper part of the bridge structure, including dead load gravity of a beam body, live load and braking force of a vehicle, temperature stretching force, wind power, earthquake force, impact force and the like; and the device is also suitable for various translational linear displacement and rotational angular displacement of the beam body caused by temperature change and live load change.
In the early stage of the 80 s of the last century and in the late stage of the last century, supports with poor replaceability, including PZ and GPZ series basin-type supports and QZ series spherical supports, are adopted in bridge structures in China, and are applied to the bridge structures so far, so that the operation safety of the bridge structures is influenced due to the reasons that main stressed steel structures are seriously rusted, rubber is aged, displacement sliding plates are excessively worn and the like, the service life of the bridge structures is shortened, and the bridge structures need to be replaced in time in a large amount. However, the bridge supports are poor in replacement, and the reason why the bridge supports are not easy to replace is as follows: the anchor connection structure of the upper and lower structures of the bridge influences the dismantling of the old bridge support and the positioning of the new bridge support, and the current situation that the height design of the support base is low or the base stone is lacked and the actual situation that the anchor connection structure is installed irregularly make the replacement of the old bridge support very difficult; during replacement, on one hand, a large jacking amount is needed to complete the replacement operation, the overstress damage of the beam body is aggravated, and the method is particularly not suitable for the old bridge structure with low concrete strength; on the other hand, a large amount of concrete for breaking the pad stone or the abutment is required, and in addition to the broken vibration damage, the replacement construction measure cost and the construction direct cost are also high.
The replacement method of the traditional exposed anchor rod connection mode of the old bridge support comprises the following steps: firstly, disassembling an anchor rod nut, jacking a beam body, backing up a lower support plate, cutting an anchor rod along the joint surface of the bridge support, the bottom surface of the beam body and the top surface of a pad stone, and taking out an old bridge support; drilling holes on the bottom surface of the beam body and the top surface of the pad stone by avoiding the position of an anchor rod of the old bridge support; and finally, pre-embedding the sleeve and connecting the new bridge support. This conventional replacement method has the following drawbacks: (1) because the old bridge support connected with the exposed anchor rods is a series of standard products, when the specification of the support is a medium and small specification, the height H value of the support is lower, meanwhile, the design of the pad stone is not standard, and the current situation that the pad stone is lacked or the height of the pad stone is lower exists, so that when the bridge support is replaced, the vertical operation space is small, the drilling on the bottom surface of the bridge body or the top surface of the pad stone cannot be implemented, or only shallow holes can be drilled, and the hole depth cannot meet the requirement of the connection strength; (2) because the reinforcing bar arrangement conditions of a beam body, a pad stone and an abutment of the early-built bridge often deviate from the positions required by the design, the stressed reinforcing bar is difficult to avoid during drilling, the phenomenon that the stressed reinforcing bar is damaged by drilling is caused, a larger vibration phenomenon can be generated when the stressed reinforcing bar is touched during drilling, or the strength of reinforced concrete is weakened and reduced after the stressed reinforcing bar is drilled; (3) when drilling holes, the old bridge support anchor rod needs to be avoided, otherwise, the phenomena of drill bit damage and reinforced concrete strength severe weakening occur, when drilling holes in the plane contour line of the old support anchor rod, the phenomena of displacement interference of the support and movement jacking separation of parts occur, and in order to ensure the design strength of the support, the plane position of the drilling hole can not be moved inwards in general; when a hole is drilled outside the plane outline of the old support anchor rod, the phenomena that the plane outline of the pad is too close to the drilling position and the drilling position is positioned outside the plane outline of the pad can occur, sometimes, the phenomenon that the drilling position exceeds the edge of the outline can also occur at the end part of a beam body, and the phenomena need to be reinforced by the pad and the beam end; (4) the design of the new bridge bearing can be confirmed according to the position or height of a drill hole in site construction, the design and manufacturing period of the new bridge bearing is increased, and the requirement of urgent replacement period cannot be met.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for replacing a bridge support, aiming at the defects of the prior art, the method can be used for replacing the old bridge support under the conditions of not changing the connecting position of the bridge support and not weakening the anchoring strength of an anchor rod and the strength of reinforced concrete, has short replacement period and low replacement cost, and effectively solves the practical problems that the bridge structure is easily damaged and the strength of an anchoring system and the strength of the reinforced concrete is weakened during replacement.
The technical scheme adopted by the invention is as follows: a method for replacing a bridge bearing comprises the following steps:
(1) preparing a new bridge support, designing and manufacturing the new bridge support in advance according to the installation and connection size of the old bridge support, and manufacturing an embedding sleeve matched with the anchor rod;
(2) disassembling preparation, namely disassembling nuts of the fastened upper anchor rod and the fastened lower anchor rod, and jacking the beam body according to the designed jacking amount;
(3) disassembling the old bridge support, cutting the exposed upper anchor rod along the bottom surface of the upper seat plate of the old bridge support, then backing the lower seat plate of the old bridge support off the surface of the cushion stone, horizontally cutting the exposed lower anchor rod along the surface of the cushion stone after the backing is separated, and sequentially taking down the intermediate body, the lower seat plate and the upper seat plate of the old bridge support after the upper anchor rod and the lower anchor rod are cut off to finish the taking-out work of the whole old bridge support;
(4) Preparing for replacement, namely taking out the old bridge support, placing a temporary support, then dropping the bridge, slotting the anchor rod on the top surface of the pad stone after dropping the bridge, and performing excircle repair on the exposed end parts of the upper anchor rod and the lower anchor rod after slotting;
(5) installing a new bridge support, jacking a beam body according to the designed jacking amount again, firstly installing an upper seat plate of the new bridge support at an upper anchor rod position at the bottom of the beam body, temporarily fixing, then combining an intermediate of the new bridge support with a lower seat plate, installing a lower anchor rod position in a pad after combination, then installing an embedded sleeve on the upper anchor rod and the lower anchor rod, then performing pressure grouting on a slotted position of the anchor rod position of the pad, and finishing the replacement of the old bridge support.
Preferably, after the groove is formed in the step (4), the exposed length of the anchor rod meets the requirement of the anchor connection strength of the lower seat plate of the national standard.
Preferably, the repairing of the end part of the anchor rod in the step (4) comprises derusting, repairing of excircle threads and anticorrosion treatment.
The invention has the beneficial effects that:
(1) the traditional vertical drilling operation is replaced by the horizontal slotting operation, so that the situation that drilling cannot be carried out due to insufficient vertical operation space or only shallow holes can be drilled is avoided;
(2) the shallow slot processing is carried out by utilizing the thickness of the concrete protective layer, the stressed main rib is not damaged during the slot processing, and excessive vibration is not generated, so that the strength of an anchoring connection system and the reinforced concrete structure is not damaged;
(3) The anchoring system of the old bridge support is fully utilized, the anchoring depth is enough, the anchoring strength is enough, and the effective length and the connection strength of the threaded connection can meet the design requirements, so that the difficulty and the replacement cost of replacing the bridge support are reduced;
(4) the design of a new support can be carried out in advance according to the standard connection size and height, the design of the new support is started without waiting for confirming the position or height of a drilling hole, and the construction period is effectively shortened;
(5) the replacement method of the invention does not need a large amount of construction operation, reduces the investment of construction equipment and personnel, and reduces the construction measure cost and direct construction cost.
The invention is replaced under the condition of not changing the plane connecting position and height of the old bridge bearing, and the anchoring system of the old bridge bearing is fully utilized for anchoring connection after replacement, so that the structural strength and the anchoring strength of the bridge are not weakened, the replacement cost is effectively reduced, and the construction period is shortened.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The method for replacing a bridge bearing provided by the embodiment is directed to replacement of DX and SX movable bearings, and comprises the following steps:
(1) preparing a new bridge support, designing and manufacturing the new bridge support in advance according to the size of the old bridge support and the connection size and height of the bridge support in national standards, and manufacturing an embedding sleeve matched with the anchor rod; because the old bridge support anchoring system is utilized, the design of a new bridge support can be carried out according to the size data of the old bridge support during installation;
(2) Disassembling preparation, namely disassembling nuts of the fastened upper anchor rod and the fastened lower anchor rod, then jacking the beam body according to the designed jacking amount, wherein the jacking amount is generally controlled to be 5-20 mm according to different bridges;
(3) the old bridge support is disassembled, after the fastening nuts of the upper anchor rods are disassembled, the upper seat plate of the old bridge support is attached to the bottom surface of the beam body, the exposed upper anchor rods are cut along the bottom surface of the upper seat plate, after the upper anchor rods are cut off, the intermediate body of the old bridge support is separated from the beam body, and after the separation, the upper seat plate is connected to the bottom of the beam body by the upper anchor rods;
the lower seat plate of the old bridge support is separated from the surface of the pad stone, the exposed lower anchor rod is horizontally cut along the surface of the pad stone after the lower anchor rod is separated, namely the lower seat plate of the old bridge support is separated from the pad stone and the abutment, after the lower anchor rod is cut off, the anchor rod connected with the lower seat plate and fastened is connected on the lower seat plate, and the rest anchor rod is still anchored in the pad stone and the abutment;
when the upper anchor rod and the lower anchor rod are cut off, the old bridge support is separated from the beam body and the cushion stone, at the moment, the middle body of the old bridge support is integrally and horizontally moved out, then the lower seat plate is integrally and horizontally moved and taken out, finally the upper seat plate at the bottom of the beam body is detached from the beam body, and the whole old bridge support is taken out;
(4) Preparing for replacement, namely taking out an old bridge support, then dropping the bridge and temporarily supporting, then slotting in the horizontal direction at the anchor rod on the top surface of the pad stone, controlling the depth of the slotting to be 30-80 mm, carrying out rust removal treatment on the exposed end parts of the upper anchor rod and the lower anchor rod after slotting, carrying out thread repair on an excircle after rust removal, and carrying out corrosion prevention treatment after repair;
(5) installing a new bridge support, jacking the beam body again according to the designed jacking amount, installing an upper seat plate of the new bridge support corresponding to the upper anchor rod at the bottom of the beam body, temporarily fixing, then the intermediate body of the new bridge support and the lower seat plate are connected and combined, and after combination, the intermediate body and the lower seat plate are installed and connected at the lower anchor rod in the pad stone through the lower seat plate, and after installation in place, an embedding sleeve is installed, the embedding sleeve is in a fastening nut shape, a hollow connecting hole matched with the anchor rod is formed in the embedding sleeve, threads matched with the anchor rod are carved on the inner wall of the connecting hole, the lower seat plate is arranged behind the surface of the cushion stone, the embedding sleeve is sleeved at the end part of the lower anchor rod, then the beam is dropped, after the beam is dropped, the embedding sleeves at the end parts of the upper anchor rod and the lower anchor rod are screwed or welded, and carrying out conventional pressure grouting on the grooving part of the stone-setting anchor rod, installing a dustproof device on a new bridge support after the pressure grouting is finished and the solidification, and finishing the replacement of the bridge support after the installation.
Example 2
The method for replacing the bridge support provided by the embodiment aims at replacing the fixed support, and comprises the following steps:
(1) preparing a new bridge support, designing and manufacturing the new bridge support in advance according to the size of the old bridge support and the connection size and height of the bridge support in national standards, and manufacturing an embedding sleeve matched with the anchor rod; because the old bridge support anchoring system is utilized, the design of a new bridge support can be carried out according to the size data of the old bridge support during installation;
(2) disassembling preparation, namely disassembling nuts of the fastened upper anchor rod and the fastened lower anchor rod, jacking the beam body according to the designed jacking amount, wherein the jacking amount is generally controlled to be 9-12 mm according to different bridges;
(3) the old bridge support is disassembled, the beam body is jacked and provided with temporary supports, then the exposed upper anchor rods are horizontally cut along the bottom surface of the beam body, after the upper anchor rods are cut off, namely the upper seat plate of the old bridge support is separated from the beam body, after separation, the anchor rods connected with the upper seat plate and fastened are connected to the upper seat plate, and the rest anchor rods are still anchored in the beam body;
the lower seat plate of the old bridge support is separated from the surface of the pad stone, the exposed lower anchor rod is horizontally cut along the surface of the pad stone after the lower anchor rod is separated, namely the lower seat plate of the old bridge support is separated from the pad stone and the abutment, after the lower anchor rod is cut off, the anchor rod connected with the lower seat plate and fastened is connected on the lower seat plate, and the rest anchor rod is still anchored in the pad stone and the abutment;
When the upper anchor rod and the lower anchor rod are cut off, the old bridge support is separated from the beam body and the pad stone, and the old bridge support can be integrally translated and taken out;
(4) preparing for replacement, namely taking out an old bridge support, then dropping the bridge and temporarily supporting, then slotting in the horizontal direction at the anchor rods on the bottom surface of the bridge body and the top surface of the pad stone, wherein the depth of the slotting ensures the connection strength of the upper anchor rod and the lower anchor rod, the depth of the slotting is controlled to be 30-80 mm in general conditions, the exposed end parts of the upper anchor rod and the lower anchor rod are subjected to rust removal after slotting, the thread of an excircle is repaired after rust removal, and the anticorrosion treatment is performed after repair;
(5) installing a new bridge support, jacking a beam body according to the designed jacking amount again, translating the designed and manufactured new bridge support to the lower part of the beam body, connecting the lower seat plate of the new bridge support to the lower anchor rod in the cushion stone, pre-installing an embedding sleeve, wherein the embedding sleeve is in a fastening nut shape, a hollow connecting hole matched with the anchor rod is formed in the embedding sleeve, threads matched with the anchor rod are carved on the inner wall of the connecting hole, the lower seat plate is installed on the surface of the cushion stone, the embedding sleeve is pre-installed and sleeved at the end part of the lower anchor rod, at the moment, the installing connection part of the upper seat plate of the new bridge support corresponds to the upper anchor rod in the beam body, then dropping the beam, the upper anchor rod penetrates out of the installing connection part of the upper seat plate of the new bridge support after dropping the beam, then sleeving the embedding sleeve at the end part of the upper anchor rod and the lower anchor rod, screwing the embedding sleeve at the end part of the upper anchor rod or welding connection treatment, and after the embedding sleeve is connected and fixed, pressure grouting is carried out, a dust-proof device is installed on a new bridge bearing after the pressure grouting is finished and the new bridge bearing is solidified, and the replacement of the bridge bearing is finished after the dust-proof device is installed.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.
Claims (3)
1. A method for replacing a bridge bearing is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing a new bridge support, designing and manufacturing the new bridge support in advance according to the installation and connection size of the old bridge support, and manufacturing an embedding sleeve matched with the anchor rod;
(2) disassembling preparation, namely disassembling nuts of the fastened upper anchor rod and the fastened lower anchor rod, and jacking the beam body according to the designed jacking amount;
(3) disassembling the old bridge support, cutting the exposed upper anchor rod along the bottom surface of the upper seat plate of the old bridge support, then backing the lower seat plate of the old bridge support off the surface of the cushion stone, horizontally cutting the exposed lower anchor rod along the surface of the cushion stone after the backing is separated, and sequentially taking down the intermediate body, the lower seat plate and the upper seat plate of the old bridge support after the upper anchor rod and the lower anchor rod are cut off to finish the taking-out work of the whole old bridge support;
(4) preparing for replacement, namely taking out the old bridge support, placing a temporary support, then dropping the bridge, slotting the anchor rod on the top surface of the pad stone after dropping the bridge, and performing excircle repair on the exposed end parts of the upper anchor rod and the lower anchor rod after slotting;
(5) Installing a new bridge support, jacking a beam body according to the designed jacking amount again, firstly installing an upper seat plate of the new bridge support at an upper anchor rod position at the bottom of the beam body, temporarily fixing, then combining an intermediate of the new bridge support with a lower seat plate, installing a lower anchor rod position in a pad after combination, then installing an embedded sleeve on the upper anchor rod and the lower anchor rod, then performing pressure grouting on a slotted position of the anchor rod position of the pad, and finishing the replacement of the old bridge support.
2. The method for replacing a bridge bearer according to claim 1, wherein: after the groove is formed in the step (4), the exposed length of the anchor rod meets the requirement of the anchoring connection strength of the lower seat plate of the national standard.
3. A method for replacing a bridge bearer according to claim 1 or 2, wherein: and (4) repairing the end part of the anchor rod in the step (4) comprises derusting, repairing the excircle thread and performing anticorrosive treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010696795.XA CN111851324B (en) | 2020-07-16 | 2020-07-16 | Method for replacing bridge support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010696795.XA CN111851324B (en) | 2020-07-16 | 2020-07-16 | Method for replacing bridge support |
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| Publication Number | Publication Date |
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| CN111851324A true CN111851324A (en) | 2020-10-30 |
| CN111851324B CN111851324B (en) | 2022-05-17 |
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| CN202010696795.XA Active CN111851324B (en) | 2020-07-16 | 2020-07-16 | Method for replacing bridge support |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855645A (en) * | 2022-04-18 | 2022-08-05 | 上海市机械施工集团有限公司 | Bridge support replacing device and replacing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009287183A (en) * | 2008-05-27 | 2009-12-10 | Kawaguchi Metal Industries Co Ltd | Support replacing method for concrete beam |
| CN205115998U (en) * | 2015-10-21 | 2016-03-30 | 浙江秦山橡胶工程股份有限公司 | Be used for building to change or reinforced (rfd) spherical bearing |
| CN107620262A (en) * | 2017-09-20 | 2018-01-23 | 广东和立土木工程有限公司 | A kind of pot bearing for retaining whole anchor bolts changes construction method |
| CN110565544A (en) * | 2019-08-21 | 2019-12-13 | 上海天演建筑物移位工程股份有限公司 | support replacing method |
| CN111560862A (en) * | 2020-04-29 | 2020-08-21 | 南京林业大学 | Pre-pressing self-balancing support replacing method |
-
2020
- 2020-07-16 CN CN202010696795.XA patent/CN111851324B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009287183A (en) * | 2008-05-27 | 2009-12-10 | Kawaguchi Metal Industries Co Ltd | Support replacing method for concrete beam |
| CN205115998U (en) * | 2015-10-21 | 2016-03-30 | 浙江秦山橡胶工程股份有限公司 | Be used for building to change or reinforced (rfd) spherical bearing |
| CN107620262A (en) * | 2017-09-20 | 2018-01-23 | 广东和立土木工程有限公司 | A kind of pot bearing for retaining whole anchor bolts changes construction method |
| CN110565544A (en) * | 2019-08-21 | 2019-12-13 | 上海天演建筑物移位工程股份有限公司 | support replacing method |
| CN111560862A (en) * | 2020-04-29 | 2020-08-21 | 南京林业大学 | Pre-pressing self-balancing support replacing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855645A (en) * | 2022-04-18 | 2022-08-05 | 上海市机械施工集团有限公司 | Bridge support replacing device and replacing method |
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| CN111851324B (en) | 2022-05-17 |
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