A steel bridge three-dimensional cross weld structure and its construction method

Abstract

The invention discloses a steel bridge three-dimensional intersectional welding seam structure and a construction method thereof. The steel bridge three-dimensional intersectional welding seam structure comprises perpendicularly welded webs and wing plates. The side edge of the first web of the webs is longitudinally welded to the bottom face of the first wing plate of the wing plates to form a first steel structural unit. The side edge of the second web of the webs is longitudinally welded to the bottom face of the second wing plate of the wing plates to form a second steel structural unit. The lateral edges of the first web and the second web are separately provided with a first opening and a second opening through cutting. The first steel structural unit is welded to the second steel structural unit in a butt joint mode. The first opening is in butt joint with the second opening to form an over weld hole, and an opening is formed in the portion, at a butt-jointed seam of the first wing plate and the second wing plate, of the over weld hole. One sides or the two sides of the portions, at the over weld hole, of the webs are covered with reinforcing plates. The outer edges of the reinforcing plates are continuously welded to the webs and the wing plates correspondingly. By adoption of the steel bridge three-dimensional intersectional welding seam structure and the construction method thereof, the problems that according to a traditional three-dimensional intersectional welding seam structure, the section suddenly changes, the anti-fatigue effect is weak, and over weld hole blocking materials crack and fail are solved.

Description

technical field [0001] The invention relates to the technical field of bridge welding, in particular to a steel bridge three-dimensional intersection weld structure and a construction method thereof. Background technique [0002] In the design of steel structure bridges, the flanges and webs of steel members are often butt welded at the same section, and the flange butt welds, web butt welds, and fillet welds between webs and flanges form a three-dimensional intersection. Meet at a point on the docking surface. The intersection and overlap of multiple welds will cause the accumulation of welding residual stress and welding defects. It is necessary to adopt reasonable structural layout and welding construction methods to improve the stress safety of butt welds of components. Under the action of bending moment, the flange of the steel member bears most of the normal stress caused by the bending moment, and the web mainly bears the shear stress. Combined with the stress chara...

AI Technical Summary

Problems solved by technology

It solves the problems of sudden change in the section of the traditional three-dimensional cross weld structure, weak anti-fatigue ability, and cracking and failure of welding hole sealing materials

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