A construction method for main girder side-span closure for composite girder cable-stayed bridges

Abstract

The invention discloses a main beam side-span closure construction method for a bond beam cable-stayed bridge. Suspension splicing installation is not conducted on a side-span tail end beam section. A tail-section steel beam is spliced and constructed through a landing steel pipe support. End cross beam reinforced concrete is constructed through a scaffold. A side-span closure opening is additionally formed between the side-span tail end beam section and a sub-tail end beam section. Through reverse pre-deviation of an end cross beam (including a support top board) and jacking reset of the end cross beam, the problem about matching of a bond beam and a standard bond beam section after the end cross beam is poured is effectively solved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a main girder side span closing construction method for a combined girder cable-stayed bridge. Background technique [0002] For the design of steel-concrete combined beams, reinforced concrete end beams are generally used as counterweights at the end beam sections of the side spans. The end beams are cast-in-place and integrated with the steel beams, and connected to the piers through vertical supports. [0003] Due to the long construction period of the end beam and the large cantilever state of the combined beam, due to the influence of temperature, wind vibration and other factors, the combined beam is in an unstable state, and the quality of concrete pouring is difficult to control. In order to ensure the construction period and construction quality, there are generally two traditional construction methods: one is to fix the end steel beam in three directions by setting te...

AI Technical Summary

Problems solved by technology

For the first method, three-way temporary consolidation must be installed in the cable tower area of ​​the combined beam main beam in the cantilever construction. If the three-way temporary consolidation is set at the end section of the side span, the entire side span main beam is in a rigid restraint state , under the influence of changes in the construction environment and various loads, the main girder is prone to produce secondary stresses that lead to quality problems such as deformation and cracking, and the design and construction of the three-dimensional consolidation system are relatively difficult; for the second method, although it is not necessary Temporary consolidation measures, but the construction process is complex, affected by the closed space, the quality of concrete construction is difficult to guarantee, especially the shrinkage and creep of concrete can easily cause the concrete to be separated from the steel box, forming hollows

Images