Composite box girder bridge erected in advance by using corrugated steel web steel girders and construction method thereof

Abstract

The invention discloses a composite box girder bridge erected in advance by using corrugated steel web steel girders. The bridge comprises a concrete soleplate, a steel girder and a concrete upper top plate, wherein the steel girder is a corrugated steel web steel girder structure; the steel girder comprises a pair of corrugated steel webs which is arranged vertically and symmetrically and an open-web diaphragm unit erected between the pair of corrugated steel webs; and the upper end of each corrugated steel web is provided with an upper connecting mechanism to be firmly connected with the concrete top plate, and the lower end of the corrugated steel web is provided with a lower connecting mechanism to be firmly connected with the concrete soleplate. The invention also discloses a construction method for the composite box girder bridge erected in advance by using the corrugated steel web steel girders. The corrugated steel webs are used as composite box girder webs, so dead weight of a structure is reduced, live load efficiency is enhanced and a cracking problem of a conventional concrete box girder web is solved; and simultaneously, bracket-free construction can be realized in a high pier, construction quality is enhanced, construction process is fastened and remarkable economic and social benefits are achieved.

Description

technical field [0001] The invention relates to a composite box girder bridge and a construction method thereof, in particular to a composite box girder bridge erected in advance by using folded steel web steel girders and a construction method thereof. Background technique [0002] At present, the web of an ordinary concrete box girder is integrated with the top and bottom slabs, and the stress problems caused by the temperature difference between the top and bottom slabs and the drying and constriction of the web are relatively prominent. Insufficient shear resistance and tensile strength lead to various cracks, which seriously affect the load-bearing performance and durability of the bridge. The traditional box girder with folded steel webs can better solve the above problems, but because the design and structure of small and medium bridges usually use full-height supports, the construction seriously affects the traffic under the bridge or it is difficult to realize when ...

AI Technical Summary

Problems solved by technology

[0002] At present, the web of an ordinary concrete box girder is integrated with the top and bottom slabs, and the stress problems caused by the temperature difference between the top and bottom slabs and the drying and constriction of the web are relatively prominent. Insufficient shear and tensile strength will lead to various cracks, which seriously affect the load-bearing performance and durability of the bridge

The traditional folded steel web combined box girder can solve the above problems well, but because the design and structure of small and medium-sized bridges usually adopt full-height brackets, it will seriously affect the traffic under the bridge or it is difficult to realize when the pier is high.

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