Steel pipe web prestress steel mixing combination main beam structure and construction method

Abstract

The invention discloses a steel pipe web prestress steel mixing combination main beam structure and a construction method. The structure comprises concrete top plates, concrete bottom plates, web steel pipes, body prestress steel strands, external steel cables and transverse partition plates. The web steel pipes are embedded between the concrete top plates and the concrete bottom plates; the top end and bottom end of the adjacent two web steel pipes are connected through a shear key bolt plate to form a longitudinal triangular stable structure; a plurality of steel pipes are connected to each other sequentially to form a beam body web for bearing the beam body shear and part of the bending moment. The body prestress steel strands are embedded in the top plate concrete and bottom plate concrete; the external steel cables are arranged inside a steel mixing combination beam frame; the transverse partition plates are located inside the steel mixing combination beam frame and are arranged at a distance from each other, and poured with the top plate concrete and bottom plate concrete to form an unity.

Description

technical field [0001] The invention relates to the technical field of bridges used in civil engineering, and more specifically relates to a steel pipe web prestressed steel-concrete composite main girder structure and a construction method. Background technique [0002] A bridge is a structure for crossing various obstacles (such as rivers or other structures) in highways, railways, urban roads, rural roads, and water conservancy construction. According to the structural form, bridges can generally be divided into girder bridges, arch bridges, cable-stayed bridges and suspension bridges; according to the type of materials used, bridges can generally be divided into wooden bridges, masonry bridges, reinforced concrete bridges, steel bridges, and steel-concrete composite structure bridges Wait. [0003] A girder bridge is a bridge in which the main girder is mainly subjected to bending as the load-bearing member. Main girders can be solid web or truss girders. The steel-co...

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Problems solved by technology

Due to the light weight of solid-web steel-concrete composite beams (steel plate composite beams, steel box composite beams), solid-web steel panels are easily affected by wind loads; empty-web steel-concrete composite beams (steel truss composite beams) cannot , the top and bottom slabs are prestressed in the concrete to resist dead load and live load, so the spanning capacity is greatly limited; when traditional steel beams are assembled, cantilever construction is more difficult, and floor supports need to be erected for temporary support of steel beams

Generally speaking, the main disadvantages of traditional steel-concrete composite structure girder bridges are: (1) The wind resistance capacity of solid-web steel-concrete composite beams is poor; The construction is complex and the construction site occupies a large area

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