Temporary anchor cable balance construction method in erecting process of suspension bridge girder

Abstract

The invention provides a temporary anchor cable balance construction method in the erecting process of a suspension bridge girder, and belongs to the technical field of bridge engineering. The temporary anchor cable balance construction method comprises the steps that a bracket is erected at the position close to the anchorage position firstly, the first section of the girder is mounted on the bracket, and a temporary anchor cable is mounted on the girder to be connected with a side span main cable; then a mid-span beam section is hoisted, the temporary anchor cable mounted on the first section of the girder automatically tightens while the weight of the mid-span beam section is gradually transferred to a mid-span main cable, equivalently, the load is simultaneously applied to the side span and the side span main cable, and significantly-increased main cable force due to the excessively high weight of the beam section of the mid span is balanced; and then a beam section is hoisted at the side span, the side span main cable generates large displacement downwards, thus the tightened temporary anchor cable automatically loosens, the increase amplitude of the side span main cable forceis also decreased accordingly, and unbalanced force of a cable tower due to hoisting construction is decreased. According to the temporary anchor cable balance construction method, the ability of automatically balancing the main span main cable force and the side span main cable force of a suspension bridge is achieved, the bending moment of the cable tower can be decreased, and thus bridge toweris safer during stress.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a temporary anchor cable balancing construction method in the erection process of a main girder of a suspension bridge. Background technique [0002] In the construction of existing suspension bridges, the mid-span and side-span are often used to alternately hoist the main girder segments combined with the construction method of saddle jacking. When the unbalanced force generated by the main When the value is high, the unbalanced force is released by pushing the saddle to reduce the bending moment of the tower. [0003] With the advancement of construction technology and the development of hoisting equipment, the weight of a single beam segment is increasing. According to the traditional construction method, when the beam section is hoisted at the mid-span, because the weight of a single beam section is too large, the increase in the main cable force of t...

AI Technical Summary

Problems solved by technology

However, the disadvantages of these two methods are: it is impossible to push the cable saddle or increase the balance counterweight while hoisting the beam section; Saddle top push is even more unfavorable for side-span hoisting

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