Method for erecting steel girder of cable-stayed bridge with diagonal main trusses

Abstract

The invention discloses a method for erecting a steel girder of a cable-stayed bridge with diagonal main trusses. The method comprises the following steps that A10, a diagonal web member is mounted, lifting steel wire ropes are fixedly arranged on the diagonal web member, leading chains are mounted on the lifting steel wire ropes, the diagonal angle and the twist angle of the diagonal web member are regulated through the leading chains after the diagonal web member is lifted to a position to be erected by utilizing a girder erection crane, and then the mounting of the diagonal web member is completed; A20, lower chords, a lower layer bridge deck system and vertical web members are lifted and mounted by utilizing the girder erection crane; A30, a sway bracing is mounted in an auxiliary manner by utilizing a movable type vertical support frame; A40, upper chords are mounted by utilizing the girder erection crane; and A50, an upper layer bridge deck system is lifted and mounted at twice in the longitudinal direction of the bridge. The method has the advantages of simplicity in operation and short construction period, and the problems of difficulty in space positioning and mounting of the diagonal web member, high middle span deflection of the mounting state of the sway bracing and large welding workload of the upper layer bridge deck system are solved.

Description

technical field [0001] The invention relates to bridge construction technology, in particular to a method for erecting steel girders of inclined main truss cable-stayed bridges. Background technique [0002] With the gradual increase in the construction of highway and railway dual-purpose bridges, the bridge shape of the inclined main truss cable-stayed bridge can better meet the requirements of unequal width of the bridge deck of highway and railway dual-purpose bridges due to its wide cross-section. The dosage is relatively low, and it is gradually widely used. At present, the Zhengzhou Yellow River highway-rail bridge that has been built in China is the first three-truss bridge in China that uses inclined main trusses. The steel girders are relatively small, and the steel girders are constructed using the jacking method, and the steel girders are assembled on the shore assembly platform using a gantry crane. [0003] Long-span steel truss girder cable-stayed bridges all...

AI Technical Summary

Problems solved by technology

[0004] The technical problems to be solved by the present invention are the difficulty in spatial positioning and installation of diagonal web bars, the large mid-span deflection in the installation state of the cross-links, and the large welding workload of the upper bridge deck system.

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