CN112323654A - Bridge full-prefabrication widening method - Google Patents
Bridge full-prefabrication widening method Download PDFInfo
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- CN112323654A CN112323654A CN202011284528.8A CN202011284528A CN112323654A CN 112323654 A CN112323654 A CN 112323654A CN 202011284528 A CN202011284528 A CN 202011284528A CN 112323654 A CN112323654 A CN 112323654A
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- prefabricated
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- bridge pier
- pier
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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
Abstract
The invention relates to a bridge full-prefabricating and widening method, which comprises the following steps: 1. feeding back measurement data of the old bridge structure, and adopting matching construction for newly-built bridges; 2. building a bridge bearing platform embedded assembly module, and performing matched construction with the prefabricated bridge pier; 3. the prefabricated bridge pier adopts special support legs and steel base plates, and the verticality and elevation of the prefabricated bridge pier are finely adjusted; 4. the prefabricated capping beam and the upper structure are prefabricated and installed in a matching way with the old bridge; 5. the abutted seams adopt high polymer mortar expansion joints, are not influenced by the road surface structure of an old bridge, are high in construction speed and ensure the expansion performance at the same time. The invention has high matching precision, safe construction and greatly shortened construction period of a construction site, and solves the problem that the traffic needs to be quickly recovered in bridge widening construction.
Description
Technical Field
The invention relates to a full-prefabrication widening method for a bridge, in particular to a construction method for prefabricating and high-precision matched installation of piers when rapid traffic recovery is required in the prefabricated assembly type construction for rebuilding a bridge.
Background
With the increasing of the traffic flow, some old roads face the difficult problems of reconstruction and widening, how to widen the roads, ensure the connection of new and old roads, how to quickly recover the traffic and the like.
The width splicing and prefabricating assembly of the reconstructed road bridge has high precision, and the survey of the old bridge and the design difficulty of a new bridge are high. The construction period of the cast-in-situ construction is long, the construction and the traffic operation are easy to influence each other, and a plurality of contradictions are generated. When the prefabricated site is installed, the deviation of pore canals and the irregularity of construction joints are easily caused, and the difficulty of construction, measurement and positioning is higher. Under the background, measured data such as the plane position and the elevation of an old bridge are measured before construction, and when a bearing platform is constructed, a pier prefabricated sleeve module is pre-embedded according to the measured data, and a pier, a capping beam and an upper structure are matched, prefabricated and installed in a matched mode, so that slab staggering does not occur between the bodies of a new pier and an old pier. The expansion joints are used for the joints between the old bridge and the new bridge, and the material has the characteristics of high elasticity, no shrinkage, good cohesiveness and the like, and is short in construction period and good in durability. The construction method can effectively reduce the construction period, accelerate traffic recovery, simultaneously give consideration to the connection and matching between the new bridge and the old bridge, and has high construction precision.
Disclosure of Invention
The invention aims to solve the problem of road widening, shorten the construction period and improve the matching precision between a new bridge and an old bridge, and provides a bridge full-prefabrication widening method.
The technical scheme of the invention is as follows: a bridge full-prefabricating and widening method comprises the following steps:
1) old bridge data acquisition
Measuring the plane positions and elevations of the piers of the old bridge and the side lines of the road surface to formulate the structural size of the new bridge, and taking the measured data as the basis of prefabrication and construction to ensure that the connection between the new bridge and the old bridge is smooth and straight;
2) bearing platform and sleeve module construction
When the bearing platform is constructed, arranging a prefabricated sleeve module, performing matching construction on the prefabricated pier reserved dowel bars and the prefabricated sleeve module, performing high-precision machining on the whole prefabricated sleeve module, determining, lofting and installing according to the position of an old bridge pier by using measurement data when the bearing platform is constructed, and calibrating the position of the old bridge pier in the installation process; before the prefabricated bridge pier is installed, the prefabricated bridge pier reserved joint bars and the prefabricated sleeve modules are installed in a matched mode, and the installation accuracy of the prefabricated bridge pier is guaranteed;
3) prefabricated bridge pier installation
The prefabricated bridge pier is provided with embedded parts for mounting brackets; when the prefabricated bridge pier is hoisted, steel gaskets are placed on two sides of an interface of a bearing platform and the prefabricated bridge pier according to a measuring result of the bearing platform to roughly adjust the elevation of the prefabricated bridge pier, then a bracket and a jack are installed, the verticality and the elevation of the prefabricated bridge pier are finely adjusted through the jack, after the prefabricated bridge pier is installed, grouting materials are poured into a prefabricated sleeve module, grouting materials are poured on the joint surface of the prefabricated bridge pier and the bearing platform, the prefabricated bridge pier falls down, the position deviation is measured, the verticality and the elevation are accurately adjusted through a plurality of jacks placed on two sides, and the prefabricated bridge pier is installed;
4) prefabricated bent cap and prefabricated superstructure construction
The prefabricated capping beam is prefabricated in a matched mode with the prefabricated bridge pier, the upper portion of the prefabricated bridge pier is reserved with a joint bar, the joint bar is installed in a matched mode with the prefabricated capping beam sleeve, and a steel gasket is placed on the top face of the prefabricated bridge pier to adjust the elevation of the prefabricated capping beam; high-strength mortar is paved on the interface of the prefabricated bridge pier and the prefabricated capping beam, and after the installation is finished and the high-strength mortar reaches the strength, capping beam sleeve grouting is carried out; the prefabricated plate beam is prefabricated according to the size information fed back by the plane position of the old bridge, the structure joint is ensured to be straight, and the prefabricated upper structure is hoisted after the prefabricated bent cap construction is finished;
5) adopt polymer mortar expansion joint as piece
And a structure joint is arranged between the new bridge deck and the old bridge deck, after the construction of the auxiliary structure is finished, the structure joint construction is carried out, and the structure joint construction adopts a high polymer mortar expansion joint.
Further, the construction steps of the polymer mortar expansion joint are as follows:
(1) cleaning the old bridge side and the new bridge side groove area; (2) pouring self-leveling sealant; (3) installing a template; (4) pouring and maintaining the polymer mortar; (5) and embedding and filling the sealing strip and pouring sealant.
The invention has the beneficial effects that: (1) the matching precision is high, the construction is safe (2), the construction period of a construction site is greatly shortened, and the problem that the existing road and bridge widening construction needs rapid traffic recovery is solved.
Drawings
FIGS. 1 to 4 are schematic views of the installation method for rebuilding and widening the newly-built bridge structure according to the present invention;
FIGS. 5 and 6 are schematic views of the polymer mortar expansion joint;
fig. 7 and 8 are overall schematic diagrams of rebuilding and widening the newly built bridge.
Detailed Description
The invention is further described with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Aiming at the difficulty of reconstruction and widening of the prefabricated assembly construction of the newly-built bridge, the measures of the invention are as follows:
1. and feeding back the measured data of the old bridge, and determining the structural size and the plane position of the new bridge.
2. And a prefabricated sleeve module is arranged in the bearing platform and is matched with the prefabricated bridge pier for construction.
3. Placing steel gaskets on two sides of the projection surface of the bearing platform of the prefabricated bridge pier to roughly adjust the elevation of the prefabricated bridge pier, arranging embedded parts on the prefabricated bridge pier, installing brackets and jacks, and accurately adjusting the verticality and the elevation through the jacks placed on the two sides.
4. The prefabricated capping beam is prefabricated in a matched mode with the prefabricated bridge pier, the prefabricated upper structure is constructed in a matched mode with the old bridge structure, and the condition that the structural splicing seam is straight and smooth without slab staggering is guaranteed.
5. The seam joint adopts a high polymer mortar expansion joint.
The specific implementation process of the invention comprises the following steps:
1) old bridge I data acquisition
The plane position and elevation of the pier of the old bridge I and the side line of the road surface need to be measured so as to formulate the structural size of the new bridge II, and the measured data is used as the basis of prefabrication and construction, so that the connection between the new bridge and the old bridge is ensured to be smooth and straight.
2) And constructing the bearing platform 1 and the sleeve module 2.
When the bearing platform 1 is constructed, the prefabricated sleeve modules 2 need to be arranged, and the prefabricated bridge pier reserved joint bars 3 are constructed in a matched mode with the prefabricated sleeve modules 2. The prefabricated sleeve module 2 is integrally processed with high precision, when the bearing platform 1 is constructed, the measurement data are determined according to the position of the old bridge pier 5, lofting is carried out, and installation is carried out, and the position of the old bridge pier 5 is corrected in the installation process. Before the prefabricated pier 4 is installed, the prefabricated pier 4 is reserved with the dowel bars 3 and is installed in a matching mode with the prefabricated sleeve module 2, the installation accuracy of the prefabricated pier 4 is guaranteed, and the prefabricated pier 4 is shown in the figure 1 and the figure 2.
3) Prefabricated pier 4 installation
The prefabricated bridge pier 4 is provided with embedded parts for installing the bracket 6. When the prefabricated pier 4 is hoisted, steel gaskets 7 are placed on two sides of an interface of the bearing platform 1 and the prefabricated pier 4 according to the measuring result of the bearing platform 1 to roughly adjust the elevation of the prefabricated pier 4, then brackets 6 and jacks 8 are installed, the verticality and the elevation of the prefabricated pier 4 are finely adjusted through the jacks 8, grouting materials are poured into the prefabricated sleeve modules 2 after the prefabricated pier 4 and the bearing platform 1 are installed, grouting materials are paved on the interface of the prefabricated pier 4 and the bearing platform 1, the prefabricated pier 4 falls down, position deviation is measured, the verticality and the elevation are accurately adjusted through the jacks 8 placed on two sides, the prefabricated pier 4 is installed, and the steps shown in the figure 3 and the figure 4 are completed.
4) Construction of prefabricated bent cap 9 and prefabricated superstructure 10
The prefabricated capping beam 9 is prefabricated in a matched mode with the prefabricated bridge pier 4, the dowel bars 11 are reserved on the upper portion of the prefabricated bridge pier 4 and installed in a matched mode with the prefabricated capping beam sleeve 12, and the steel gasket 7 is placed on the top face of the prefabricated bridge pier 4 to adjust the elevation of the prefabricated capping beam. And high-strength mortar is paved on the interface of the prefabricated pier 4 and the prefabricated capping beam 9, and the prefabricated capping beam sleeve 12 is grouted after the installation is finished and the high-strength mortar reaches the strength. The precast slab beam is precast according to the size information fed back by the plane position of the old bridge, the structure splicing is ensured to be straight, and the precast upper structure 10 is hoisted after the construction of the precast bent cap 9 is finished, as shown in fig. 3 and 4.
5) Adopt polymer mortar expansion joint III as piece
There is one structure piece between new bridge floor and the old bridge floor, and the back is accomplished in the auxiliary structure construction, carries out the structure piece construction, adopts polymer mortar expansion joint III, main process flow: cleaning the groove areas 13 at the old bridge side and the new bridge side, pouring self-leveling sealant 14, installing a template 15, pouring and maintaining polymer mortar 16, embedding and filling a sealing strip 17, and pouring sealant 18, as shown in fig. 5 and 6.
And (5) completing the construction of rebuilding and widening the newly-built bridge, and referring to fig. 7 and 8.
Claims (2)
1. A bridge full-prefabricating widening method is characterized by comprising the following steps:
1) old bridge data acquisition
Measuring the plane positions and elevations of the piers of the old bridge and the side lines of the road surface to formulate the structural size of the new bridge, and taking the measured data as the basis of prefabrication and construction to ensure that the connection between the new bridge and the old bridge is smooth and straight;
2) bearing platform and sleeve module construction
When the bearing platform is constructed, arranging a prefabricated sleeve module, performing matching construction on the prefabricated pier reserved dowel bars and the prefabricated sleeve module, performing high-precision machining on the whole prefabricated sleeve module, determining, lofting and installing according to the position of an old bridge pier by using measurement data when the bearing platform is constructed, and calibrating the position of the old bridge pier in the installation process; before the prefabricated bridge pier is installed, the prefabricated bridge pier reserved joint bars and the prefabricated sleeve modules are installed in a matched mode, and the installation accuracy of the prefabricated bridge pier is guaranteed;
3) prefabricated bridge pier installation
The prefabricated bridge pier is provided with embedded parts for mounting brackets; when the prefabricated bridge pier is hoisted, steel gaskets are placed on two sides of an interface of a bearing platform and the prefabricated bridge pier according to a measuring result of the bearing platform to roughly adjust the elevation of the prefabricated bridge pier, then a bracket and a jack are installed, the verticality and the elevation of the prefabricated bridge pier are finely adjusted through the jack, after the prefabricated bridge pier is installed, grouting materials are poured into a prefabricated sleeve module, grouting materials are poured on the joint surface of the prefabricated bridge pier and the bearing platform, the prefabricated bridge pier falls down, the position deviation is measured, the verticality and the elevation are accurately adjusted through a plurality of jacks placed on two sides, and the prefabricated bridge pier is installed;
4) prefabricated bent cap and prefabricated superstructure construction
The prefabricated capping beam is prefabricated in a matched mode with the prefabricated bridge pier, the upper portion of the prefabricated bridge pier is reserved with a joint bar, the joint bar is installed in a matched mode with the prefabricated capping beam sleeve, and a steel gasket is placed on the top face of the prefabricated bridge pier to adjust the elevation of the prefabricated capping beam; high-strength mortar is paved on the interface of the prefabricated bridge pier and the prefabricated capping beam, and after the installation is finished and the high-strength mortar reaches the strength, capping beam sleeve grouting is carried out; the prefabricated plate beam is prefabricated according to the size information fed back by the plane position of the old bridge, the structure joint is ensured to be straight, and the prefabricated upper structure is hoisted after the prefabricated bent cap construction is finished;
5) adopt polymer mortar expansion joint as piece
And a structure joint is arranged between the new bridge deck and the old bridge deck, after the construction of the auxiliary structure is finished, the structure joint construction is carried out, and the structure joint construction adopts a high polymer mortar expansion joint.
2. The bridge full prefabrication widening method according to claim 1, characterized in that: the construction steps of the polymer mortar expansion joint are as follows: (1) cleaning the old bridge side and the new bridge side groove area; (2) pouring self-leveling sealant; (3) installing a template; (4) pouring and maintaining the polymer mortar; (5) and embedding and filling the sealing strip and pouring sealant.
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| CN202011284528.8A CN112323654A (en) | 2020-11-17 | 2020-11-17 | Bridge full-prefabrication widening method |
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| CN202011284528.8A CN112323654A (en) | 2020-11-17 | 2020-11-17 | Bridge full-prefabrication widening method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430959A (en) * | 2021-08-04 | 2021-09-24 | 刘澜涛 | Construction method for prolonging radial width of expressway bridge |
| CN114214969A (en) * | 2021-12-01 | 2022-03-22 | 广州市市政工程设计研究总院有限公司 | Width splicing structure and method of width splicing bridge |
| CN114808663A (en) * | 2022-04-06 | 2022-07-29 | 北京市市政二建设工程有限责任公司 | Bridge widening structure and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430959A (en) * | 2021-08-04 | 2021-09-24 | 刘澜涛 | Construction method for prolonging radial width of expressway bridge |
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| CN114808663A (en) * | 2022-04-06 | 2022-07-29 | 北京市市政二建设工程有限责任公司 | Bridge widening structure and construction method thereof |
| CN114808663B (en) * | 2022-04-06 | 2024-02-02 | 北京市市政二建设工程有限责任公司 | Bridge widening structure and construction method thereof |
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Application publication date: 20210205 |