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

A suspension bridge and construction method technology, applied in suspension bridges, bridge construction, bridges, etc., can solve the problems of increasing the balance weight, unable to push the cable saddle, unfavorable side span hoisting, etc., to reduce the bending moment and the force of the bridge tower. safe effect

CN108643057AActive Publication Date: 2018-10-12DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-10-12

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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.
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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...

Examples

Embodiment Construction

[0015] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0016] A main span 400m, the ground-anchored suspension bridge of side span 150m, the weight of each girder section is 600 tons, adopts the method of the present invention to implement as follows:

[0017] 1) The main beam 5 of the first section of the side span near the anchorage 1 is first installed on the bracket 4, and the temporary anchor cable 2 is installed, and the bracket 4 at the anchorage 1 on the other side and the second side span of the side span are symmetrically constructed. One section of the main beam 5, and install the temporary anchor cable 2, the temporary anchor cable 2 only needs to be stretched straight, without tension;

[0018] 2) Hoisting the beam section 10 being hoisted in the mid-span, while the weight of the beam section 10 being hoisted in the mid-span is gradually transferred to the ...