CN-121992729-A - Construction method based on partition assembly and accumulated traction slippage

CN121992729ACN 121992729 ACN121992729 ACN 121992729ACN-121992729-A

Abstract

The application discloses a construction method based on zonal assembly and accumulated traction sliding, which comprises the steps of arranging a permanent bridge pier and a temporary support along the design position of a steel box girder to be erected to form a multistage support system, erecting a total assembly support in an initial area, arranging a traction platform at the top of the permanent bridge pier and installing traction equipment, sequentially assembling steel box girder segments on the total assembly support, installing steel guide girders at the front ends of the prior assembly segments, connecting the traction equipment with a traction base through traction ropes, dividing the steel box girder into a plurality of assembly units, gradually pulling forward in an accumulated sliding mode of 'assembling one section and sliding one section', carrying out transition support by the steel guide girders in the sliding process, removing the rear temporary support to release an assembly space, transferring traction connection points to the tail ends of the current assembly units, repeating the steps until all segments are assembled and integrally sliding above the design position, and positioning the girder. The application breaks down the whole traction of the large-tonnage steel box girder into a plurality of small-tonnage sliding, reduces the equipment requirement and the construction risk, and improves the construction safety and efficiency.

Inventors

ZHU QITAO
SU WENHUI
SU LEI
SUN HONGYUN
CHEN SHENGBO

Assignees

陕西路桥集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260331

Claims (10)

1. The construction method based on zonal assembly and accumulated traction slippage is characterized by comprising the following steps: S1, arranging a plurality of groups of permanent bridge piers along the designed position of a steel box girder to be erected, and arranging a plurality of groups of temporary brackets between adjacent permanent bridge piers and in the extending direction of the permanent bridge piers to form a multi-stage support system distributed along the sliding direction; S2, erecting a total assembly bracket in a preset initial area, arranging a traction platform at the top of a permanent pier close to the traction side, and installing traction equipment on the traction platform; S3, sequentially assembling all sections forming a steel box girder on the total assembly bracket, mounting a steel guide girder at the front end of the previously assembled sections, and arranging a traction base at the sections of the steel box girder and the bottom of the steel guide girder, wherein the traction equipment is connected with the traction base through traction ropes; S4, dividing the steel box girder into a plurality of assembling units according to a design sequence, wherein each assembling unit consists of at least one segment, assembling the assembling units in sequence, and gradually dragging and sliding the whole steel box girder forwards by adopting an accumulated sliding mode of 'assembling one unit and sliding one unit', so that the assembled and sliding steel box girder segments serve as bearing platforms for assembling subsequent segments; S5, in each sliding process, carrying out transition support between the temporary support and the permanent bridge pier by utilizing the steel guide beam, and continuing traction sliding to a preset position after the front end of the steel guide beam is overlapped to the front temporary support or the permanent bridge pier; S6, in the sliding process, removing or partially removing the rear temporary support according to the position of the current assembly unit to release the assembly space, and transferring a traction connection point of traction equipment from the tail end of the segment which has completed sliding to the tail end of the current assembly unit to realize segmented transmission of traction; S7, repeating the assembling unit assembling, unit sliding, traction point conversion and temporary support dismantling operations until all the steel box girder segments are assembled and integrally pulled and slid to be right above the designed position; and S8, removing the temporary support and the steel guide beam, and dropping the steel box girder onto the permanent bridge pier to finish construction.
2. The construction method based on zoned splicing and accumulated traction sliding according to claim 1, wherein in the sliding process, the traction sliding operation of the steel box girder or the steel guide girder across the sliding section of the existing line is selected to be carried out in the railway skylight period according to the operation requirement of the existing line in the construction section.
3. The construction method based on zoned assembly and accumulated traction slippage according to claim 1, wherein the traction equipment is a hydraulic tractor and the traction cable is a steel strand.
4. The construction method based on zoned assembly and accumulated traction sliding according to claim 1, wherein before the steel box girder is integrally slid in place, part of the steel guide girder is removed according to the sliding distance and the temporary support arrangement condition so as to reduce traction load.
5. The construction method based on zoned assembly and accumulated traction sliding according to claim 1, wherein the assembly sequence of the steel box girders is from the far end to the near end, and the traction sliding direction is unidirectional accumulated propulsion from an assembly area to the design position direction.
6. The construction method based on zoned assembly and accumulated traction slip according to claim 1, wherein in step S3, the traction apparatus is connected to the traction base, and the traction cable is pretensioned.
7. The construction method based on zoned assembly and cumulative traction slip according to claim 1, wherein in step S3, the steel guide beam is mounted at the front end of the steel box girder segment for crossing the gap between the temporary bracket and the permanent bridge pier during the slip.
8. The method for constructing a sectional-splice-and-cumulative traction slip-based construction according to claim 1, wherein the removing or partially removing the rear temporary support in step S6 comprises: And removing the temporary support positioned in the splicing area of the current splicing unit to provide a working space for splicing the subsequent sections.
9. The construction method based on zonal assembly and accumulated traction slip according to claim 1, wherein the step S8 of landing the steel box girder on the permanent bridge pier comprises the steps of transferring the steel box girder from the temporary support system to the support of the permanent bridge pier for permanent positioning through a vertical jack or a landing device.
10. The construction method based on zoned assembly and cumulative traction slip according to any one of claims 1 to 9, wherein the total weight of the steel box girder is not less than 3000 tons and the total distance of the traction slip is not less than 100 meters.

Description

Construction method based on partition assembly and accumulated traction slippage Technical Field The application relates to the technical field of bridge engineering construction, in particular to a construction method based on partition assembly and accumulated traction sliding. Background The steel box girder has the advantages of high structural strength, large spanning capacity, short construction period and the like, and is widely applied to bridge engineering for spanning existing lines such as railways, highways and the like. For a large-span and large-tonnage steel box girder structure, common construction modes comprise hydraulic traction sliding, pushing construction and the like. The hydraulic traction sliding construction is an important technical means for mounting the overline steel box girder because of the advantages of mature equipment, high control precision, small influence on the existing line and the like. In actual engineering, the whole weight of a large-tonnage steel box girder often reaches thousands of tons, if a mode of once traction and sliding after whole assembly is adopted, the performance requirements on traction equipment are extremely high, the bearing capacity of a traction platform and a temporary support also face a great challenge, and a great safety risk exists in the construction process. Meanwhile, the conventional one-time sliding method is limited by the operation space of a construction site and the operation safety requirement of the existing line, and is difficult to meet the actual requirements of engineering. Disclosure of Invention The embodiment of the application solves the problems in the background technology by providing a construction method based on partition assembly and accumulated traction slippage. The embodiment of the application provides a construction method based on partition assembly and accumulated traction sliding, which comprises the following steps: S1, arranging a plurality of groups of permanent bridge piers along the designed position of a steel box girder to be erected, and arranging a plurality of groups of temporary brackets between adjacent permanent bridge piers and in the extending direction of the permanent bridge piers to form a multi-stage support system distributed along the sliding direction; S2, erecting a total assembly bracket in a preset initial area, arranging a traction platform at the top of a permanent pier close to the traction side, and installing traction equipment on the traction platform; S3, sequentially assembling all sections forming a steel box girder on the total assembly bracket, mounting a steel guide girder at the front end of the previously assembled sections, and arranging a traction base at the sections of the steel box girder and the bottom of the steel guide girder, wherein the traction equipment is connected with the traction base through traction ropes; S4, dividing the steel box girder into a plurality of assembling units according to a design sequence, wherein each assembling unit consists of at least one segment, assembling the assembling units in sequence, and gradually dragging and sliding the whole steel box girder forwards by adopting an accumulated sliding mode of 'assembling one unit and sliding one unit', so that the assembled and sliding steel box girder segments serve as bearing platforms for assembling subsequent segments; S5, in each sliding process, carrying out transition support between the temporary support and the permanent bridge pier by utilizing the steel guide beam, and continuing traction sliding to a preset position after the front end of the steel guide beam is overlapped to the front temporary support or the permanent bridge pier; S6, in the sliding process, removing or partially removing the rear temporary support according to the position of the current assembly unit to release the assembly space, and transferring a traction connection point of traction equipment from the tail end of the segment which has completed sliding to the tail end of the current assembly unit to realize segmented transmission of traction; S7, repeating the assembling unit assembling, unit sliding, traction point conversion and temporary support dismantling operations until all the steel box girder segments are assembled and integrally pulled and slid to be right above the designed position; and S8, removing the temporary support and the steel guide beam, and dropping the steel box girder onto the permanent bridge pier to finish construction. In one possible implementation, during the sliding process, the traction sliding operation of the steel box girder or the steel guide girder across the sliding section of the existing line is selected to be performed in the railway skylight period according to the operation requirement of the existing line in the construction section. In one possible implementation, the traction device is a hydraulic traction device and the traction cable is a steel strand