Method for welding and connecting circular seam on over-sized spanning variable cross-section continuous steel box beam bridge

Abstract

The invention discloses a method for welding and connecting circular seams on an over-sized spanning variable cross-section continuous steel box beam bridge. The method comprises the following steps of: S1. hoisting large segments, accomplishing the primary connection of temporary brackets of corresponding circular seams on the bridge surface, and accomplishing the rough matching on circular seams at joints of the large segments; S2. measuring the temperatures of top and bottom plates of a steel box beam when the temperature is relatively stable at night, and precisely adjusting the axes and the elevations of the large segments by using the temporary brackets when the temperature difference is less than or equal to 2 DEG C; S3. after the axes and the elevations are adjusted in place, precisely adjusting the gap between the circular seams; and S4. after the gap of the circular seams at the joints is adjusted, bolting and welding the circular seams. The method mainly comprises a large segment joint matching method, a high-strength connection sequence, a welding method, a processing method of special working conditions possibly happening in the joint matching process, and the like. According to the method, the technique is advanced, the practicability and the efficiency are realized, the operability is strong and popularization is convenient, the large joint bridge connection can be rapidly accomplished in a short time, and the security index in large bridge construction is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing and construction of super-long-span variable-section continuous steel box girder bridges, and specifically relates to a bolt-welding connection method for the upper annular seam of a super-long-span variable-section continuous steel box girder bridge with a full span of 185 meters. It belongs to the technical field of transportation engineering. Background technique [0002] The erection of long-span steel box girder bridges adopts whole-hole and large-segment manufacturing, floating crane erection, and large-scale lifting ships. The operation efficiency is high, the number of equipment is relatively small, the construction organization is easy, and the installation sequence can be freely arranged according to the construction progress of the substructure , The beam erection cycle is short, the strain capacity is strong, and the reliability is high. Due to the construction method of whole h...

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Problems solved by technology

[0005] However, at present, there is no domestic precedent for the processing and manufacturing of the ultra-long steel box girder with a length of 185m, and the construction technology of the entire span. Any experience and results can be used for reference

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