Precise aerial alignment system and method of suspension bridge steel bridge

Abstract

The invention provides a precise aerial alignment system and method a suspension bridge steel bridge. A fixing rack and a counterforce rack are respectively mounted on two steel beam alignment end topchords to be aligned; the fixing rack is connected with the counterforce rack through a pull rod; the pull rod is fastened by using a screw nut at a fixing rack end; an auxiliary screw nut is screwedat a counterforce rack end, sequentially penetrates through a box type pushing bracket, a jack and a pad plate and is screwed and fastened; two steel beams are mutually approached and aligned by using the jack through a traction pull rod; chain blocks are mounted on lugs on both sides of the top surface of a steel beam; each chain block is connected with an opposite lug on the other steel beam ina diagonal manner through a steel wire rope; and the steel wire ropes are constantly tightened in the alignment process to prevent wind loads. By adopting the system, precise aerial alignment of steel beams can be rapidly achieved by virtue of stroke controllability of the jack, transverse stability of a longitudinal cross-pulling device and effectiveness of a transverse wind resistant device, the hoisting time of steel beams is shortened, and the construction cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of suspension bridge construction, and relates to a system and a method for realizing precise docking of suspension bridge steel girder sections in the air during hoisting of suspension bridge steel girders. Background technique [0002] During the hoisting of the steel girders of the suspension bridge, the adjacent girder sections must be connected in the air. At present, the steel girders of suspension bridges are mostly connected in the air with hand chain hoists for construction, such as figure 1 As shown, a chain block 4 is respectively connected to the two lifting lugs 3 on both sides of the first steel beam section 1, and each chain hoist 4 is connected to the lifting lugs on the same side of the second beam section 2 through a steel wire rope 5. By tightening The chain hoist pulls the butt ends of the two beam sections closer to each other to realize the butt joint. However, the chain hoist is a fl...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a fast, efficient, and long-term operation time for the lack of effective lateral stabilization measures for the steel girder docking of suspension bridges in the air, low longit...

Images