Prefabricated prestressed composite box girder

Abstract

The invention discloses a prefabricated prestressed composite box girder, including a plurality of box beam units. Each box beam unit includes a bottom plate, a web plate, an end plate and a top plate; the bottom plate is a concrete prefabricated plate whose upper surface is embedded with the multiple of mounting bases in the long direction of the plate; the tops of web plates are provided with connection stiffeners, the number of the web plates is matched with the number of the mounting bases, and all web plates are arranged side by side in the length direction of the plates and detachably connected with the mounting bases; the end plate is placed on the bottom plate and detachably connected between two adjacent web plates; and the top plate is a concrete precast plate, on which a post-pouring hole through the thickness of the plate is reserved, and the top plate is placed on the web plates, so that the post-pouring hole is arranged outside the connection stiffener in a sleeved mode.As all parts are prefabricated in a factory, the construction speed and quality are improved, by adopting the detachable connected web plates, the problem that the main tensile stress of concrete neara bearing is not enough is solved, the additional stress of steel corrugated web plates caused by shrinkage deformation in the curing process of traditional mixed beam concrete plates can be avoided,and the bearing property is ensured.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, in particular to an assembled prestressed composite box girder. Background technique [0002] At present, the most widely used bridge structure is the traditional reinforced concrete beam. The structure is self-heavy and unsuitable for transportation; the tensile strength of the beam body is insufficient and it is easy to crack; most of them are poured on site, with a large amount of wet work and slow construction speed, especially in the construction of urban bridges, the economic benefits are significantly reduced; the defects of low utilization rate of prestress . [0003] With the rapid development of the construction industry, the requirements for the construction period are becoming more and more stringent. Practitioners have designed corrugated steel web-concrete composite beams to solve the above problems to a certain extent, but there are still the following deficiencies: ...

AI Technical Summary

Problems solved by technology

[0004] a. Steel corrugated steel webs are mostly embedded in concrete slabs. During concrete curing, concrete shrinkage will cause additional stress on corrugated steel webs, which in turn will adversely affect the bearing capacity of corrugated steel webs;

[0005] b. At present, the project mainly adopts the method of transporting the prefabricated sub-beam sections to the site and assembling them into a whole. In this method, there are many problems such as transportation difficulties, key components are easily damaged, and site construction is difficult;

[0006] c. At present, the corrugated steel web-prestressed concrete composite beams in engineering mainly use external prestressed beams, but the durability of external prestressed beams is low, poor fatigue resistance, easy to corrode, easy to break, and there are many safety hazards

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