Construction Method of Overturning the Arch Rib of the Arch Bridge Using the Cable Crane

Abstract

The invention provides a construction method for using a cable crane for overturning an arch bridge arch rib. The method includes the steps that an arch rib section to be overturned is transported to the position of a lifting point below the crane, the lifting point of the crane descends, a fixed pulley is connected to the position below the lifting point, a steel wire rope penetrates the fixed pulley below the lifting point, the two ends of the steel wire rope are connected with two upper chords of the arch rib, the lifting point and a lower chord, located at the upper portion, of the arch rib section are connected through a chain block, the lifting point is lifted at the constant speed, and the upper chord, located at the lower portion, of the arch rib section is away from the ground and is overturned upwards; in the lifting point lifting process, the chain block is loosened continuously till the arch rib section is overturned by 45 degrees, and the chain block and the steel wire rope are in the same stress state; and then the chain block is loosened, so that the arch rib section is overturned continuously, meanwhile, the lifting point descends at the constant speed, the steel wire rope is in the stress state all the time in the lifting point descending process, finally, the arch rib section is overturned continuously by 45 degrees, and therefore the arch rib section is overturned by 90 degrees.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to an overturning construction method for an arch rib of a steel pipe arch bridge. Background technique [0002] During the construction of long-span concrete-filled steel tube arch bridges, the arch ribs are generally divided into several segments and hoisted in segments. Such as figure 1 As shown, when hoisting, the two upper chords of each arch rib segment 10 should be located at the top, and the two lower chords should be located at the bottom. In order to ensure that the hoisted arch ribs meet the design curve and alignment requirements, before hoisting, it is generally necessary to carry out trial assembly of the arch ribs at the production site to check whether the arch ribs meet the design requirements. After meeting the requirements, each segment is formally hoisted on the bridge. For the convenience of construction during trial assembly, horizont...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new arch rib overturning construction method to avoid the damage to the arch rib steel pipe during the overturning process, and to enhance safety and reduce construction costs.

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