Large-span flexible arch skew back joining construction method

Abstract

The invention discloses a large-span flexible arch skew back joining construction method. The method includes steps that (1) a beam erecting crane is mounted on an upper chord member of a steel truss beam when skew backs of the steel truss beam are pushed to a position above a temporary pier support; (2) the beam erecting crane automatically runs to positions of the skew backs after being mounted and debagged, and begins to erect flexible arch members, a one-way backslide method for erecting is adopted for the beam erecting crane, suspenders are mounted at first, then a flexible arch temporary support is mounted, and finally arch ribs are mounted; (3) the step (2) is repeated until only a last arch section space of a flexible arch is not erected, and a skew back joining opening is reserved; and (4) a finite-element analysis software is utilized to realize analog computation for the state of the joining opening, and a software analysis result basically matches with an actual joining opening measurement result, but still has vertical deviation, transverse deviation and longitudinal and horizontal deviation. By the aid of the method, the flexible arches can be erected outside an operation limit of a highway, stress-free joining of the skew backs of the flexible arches is realized, and the difficulty in erection of the flexible arches above the highway is resolved.

Description

technical field [0001] The invention relates to a large-span steel truss girder flexible arch belt vault push-arch foot closing construction method, which is mainly used for closing a large-span flexible arch at the arch foot position, and belongs to the technical field of bridge steel structures. Background technique [0002] As a structural form of long-span railway bridges, flexible arch bridges with steel truss girders have the advantages of large vertical rigidity, clear structural stress, novel design, and beautiful architectural shapes. They are used in some bridges spanning highways, railways, and rivers. At present, most of the large-span flexible arches are to reserve closing openings on the vault top, and realize flexible arch closing on the vault top. [0003] The flexible arch rib adopts a circular curve with a rise height of 45m and a rise-span ratio of 1 / 4.5. The arch rib adopts a box-shaped section, the inner height of the rod is 1460-1860mm, and the inner w...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a large-span flexible arch-arch-toe closing construction method, realize the erection of flexible arches outside the operating limits of the expressway, and realize the stress-free closing of the flexible arch at the arch foot position, and solve the problem of erecting flexible arches above the expressway construction problems

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