Construction method of side span girder section frame of cable-stayed bridge

Abstract

The invention provides a cable-stayed bridge side span beam section backout bracket construction method. The method comprises the steps of 1, with a transition pier as a starting point, with the tail end of a cantilever segment as a terminal point, and with a preset backout bracket rear supporting point as a boundary, dividing a cable-stayed bridge side span beam section into a front section, multiple middle sections and an end section, wherein the sections comprise multiple temporary supporting points; 2, arranging jacks at the bilateral symmetry portion of the temporary supporting point of the front section with a bridge center line as an axis; 3, evacuating the temporary supporting point after making the jacks bear the load of the front section; 4, removing the temporary supporting points of the multiple middle sections and the end section one by one from the transition pier to the direction of the tail end of the cantilever segment according to the working procedures in the step 2 and the step 3; 5, falling back the jacks, and making the load of the cable-stayed bridge side span beam section transfer to the backout bracket rear supporting point to complete backout bracket construction. According to the cable-stayed bridge side span beam section backout bracket construction method, the stability requirement of a bracket is met, and meanwhile the lower flexibility of the beam section is reduced.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular, the invention relates to a construction method of a side-span girder section frame of a cable-stayed bridge. Background technique [0002] In bridge construction, when all the girders are on multi-pivot supports, the connection between the main girders can be approximately regarded as a stress-free connection. The decrease in stiffness will cause downward deflection in the middle of the main girder of the side span, and at the same time, it will also cause the upward turning angle of the beam section of the auxiliary pier, which in turn will cause the curvature of the stress-free connection when the suspension hoisting beam section is closed. The safety of the support structure is greatly affected. In the prior art, the solution to the problem of dismantling temporary fulcrums is mostly implemented by using fulcrum conversion beams, but it not only requires a long constr...

AI Technical Summary

Problems solved by technology

In the prior art, the solution to the problem of dismantling temporary fulcrums is mostly implemented by using fulcrum conversion beams, but it not only requires a long construction time, but also requires high cost, and it cannot guarantee the stability of the support structure during the removal of temporary fulcrums. stability

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