Large-span tie bar arch bridge transformation method based on bridge hydraulic jacking system

Abstract

The invention discloses a large-span tie bar arch bridge transformation method based on a bridge hydraulic jacking system. A bridge to be transformed comprises a main bridge and two approach bridges.In terms of the transformation of the bridge to be transformed, the transformation method comprises the following steps of 1, carrying out bridge jacking and construction on the newly-built approach bridges, and specifically carrying out jacking construction on a to-be-jacked bridge upper structure of the bridge to be transformed and to-be-jacked approach bridge main beams 1 of the two approach bridges through the bridge hydraulic jacking system; and 2, carrying out subsequent construction. The method has the advantages of being reasonable in design, simple and convenient in construction and good in use effect; jacking for the main bridge and jacking for the two approach bridges are carried out correspondingly, structures and arrangement positions of an approach bridge jacking system and amain bridge jacking system which are adopted are specifically limited, thus being capable of conveniently and rapidly completing the jacking construction process of the large-span arch bridge, and the jacking process is safe and reliable; and in addition, while jacking is carried out on the original bridge upper structure, the two approach bridges on the front and rear portions are newly constructed so that backfilling workload can be effectively reduced, and the construction period can be shortened as well.

Description

technical field [0001] The invention belongs to the technical field of bridge jacking construction, and in particular relates to a reconstruction method for a long-span tied arch bridge based on a bridge hydraulic jacking system. Background technique [0002] Bridge jacking construction (also known as bridge jacking technology) refers to the adoption of the overall hydraulic synchronous lifting scheme, that is, using the original cast-in-place piles to bear the load, without destroying the original bridge deck pavement, railings, sidewalks, and beams and slabs. Connections, etc., first use the hydraulic jacking device to withstand the overall structure of the bridge, then cut off the columns under each pier and platform cap beam, and then operate the hydraulic jacking device to raise the bridge as a whole to the design height, and finally connect the long column steel bars Formwork pouring of the second stage concrete. The bridge superstructure refers to the general term fo...

AI Technical Summary

Problems solved by technology

Among them, when jacking up the main bridge, there are the following construction problems: First, the project is located on the expressway, and the jacking construction must interrupt the traffic, and change the two-way traffic of the double-width bridge to the two-way traffic of the single-width bridge, which will affect the traffic of the expressway Larger, short road closure time, tight construction period, and the necessary closure time during construction is short, so a construction plan that has little impact on navigation must be adopted; second, the jacking weight of the main bridge is huge, and the single jacking weight is 7,000 tons ;Third, during the jacking process, the upper structure of the bridge is in a suspended state, and there are great potential safety hazards, and effective measures must be taken to resolve the above risks to ensure the safety of the bridge and construction personnel; Fourth, the jacking height is relatively high, and the jacking With a height of 2.16m, there are many temporary pads and jacking cycles, which put forward higher requirements for the overall stability of the supporting structure. It is necessary to ensure that the vertical and horizontal support system is firm, reliable and stable.

Correspondingly, when jacking up the approach bridge, there are the following construction problems: first, the number of spans of the approach bridge is large and the jacking weight is heavy, the risk points are scattered, and the overall jacking construction process is difficult to control; second, during the jacking process, the upper part of the bridge The structure is in a suspended state, and there are great potential safety hazards. Effective measures must be taken to resolve the above risks to ensure the safety of the bridge and construction personnel; third, the jacking height is relatively high, with a jacking height of 2.16m. Temporary pads and jacking There are many cycles, which put forward higher requirements for the overall stability of the supporting structure. It is necessary to ensure that the vertical and horizontal support system is firm, reliable and stable.

[0006] From the above content, it can be known that the jacking construction of the long-span concrete filled steel pipe tied arch bridge across the canal waterway is complicated, difficult, and has high safety risks, and the jacking height is more than 2m, the construction period is short, and the task is heavy. There is no successful experience for reference, and there are few technical materials available for reference

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