A construction method for the curved main tower of a single-cable suspension bridge across the river

Abstract

A construction method of curved-surface arc-shaped main towers of a cross-river single-cable suspension bridge comprises steps as follows: the double-curved-surface arc-shaped towers are manufactured in a factory, and the steel towers are disassembled and transported to bridge sites after assembled and matched; the steel towers are lifted by a floating crane, the floating crane lifts the steel towers with double hooks, tower body postures are adjusted preliminarily, the steel towers are lifted to mounting positions slowly and pin-connected and fixed through matching parts arranged in section box openings of the steel towers, the steel towers are mounted, a transverse brace is arranged in every other one section of tower body during mounting, the steel towers are limited and prevented from inclining inwards, and folding of the steel towers is facilitated; measurement positioning is performed, finally, reflective sheets are measured by an instrument, and tops of the box openings are measured and adjusted; the steel towers are welded through hanging of assembly type hanging baskets after positioned. Accurate lifting of the main towers of the cross-river suspension bridge is realized, curved-surface arc-shaped structure profiles of the tower bodies meet the design requirement, overwater and high-altitude super-tonnage lifting is safe and reliable, and the cost is saved.

Description

technical field [0001] The invention relates to a construction method for a curved curved main tower of a single-cable suspension bridge across a river. Background technique [0002] In recent years, the domestic requirements for the appearance and aesthetics of urban facilities have become higher and higher, and the design of urban bridges has become diverse and non-repetitive. However, in the construction of the main towers of some large-scale cross-river suspension bridges, there are no conditions for hoisting the tower body segments by tower cranes, crawler cranes, and steel pipe brackets. At the same time, the hyperboloid arc-shaped structure is complex in shape, difficult to manufacture and install, and requires high construction accuracy. . [0003] Tower crane method: At present, there are only two tower cranes capable of hoisting large tonnage at 100 meters in the country. It takes a long time to transport to the on-site assembly site, and the assembly time is long...

AI Technical Summary

Problems solved by technology

[0004] Crawler Crane: For the steep slope on the east bank of the bridge and the distance from the bank, it is necessary to invest in a tower crane with a larger tonnage, or to fill the river. First, the cost is too high, and second, it will cause disruption to the natural river environment.

[0005] Steel pipe support: a large number of steel pipes are required, which is expensive, and the height of the support is more than 100 meters, which poses a great safety risk

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