A special-shaped prefabricated beam for bridges

Abstract

An irregular-shaped precast beam used for bridges comprises a reversed T-shaped beam body and a prestress steel strand which is embedded in the middle of the beam body and serves as a main reinforcing-bar. The beam body comprises a web, wherein a stirrup is arranged on a bottom flange web, and the stirrup extends out of the upper surface of the beam body. The irregular-shaped precast beam used for bridges is characterized in that through holes traversing partition board main reinforcing-bars are arranged on the lower portion of the beam body web along the longitudinal direction at intervals. The cross sections are simple in shape, and templates with single specifications and strong generality can be adopted to manufacture, thereby greatly lowering mold cost.

Description

technical field [0001] The invention relates to a bridge prefabricated component, in particular to a prefabricated girder manufactured by pretensioning and prestressing for medium and small span bridges. Background technique [0002] Girder bridges in traffic and municipal bridges basically use prefabricated I-shaped beams with diaphragms. The beams are self-heavy, and the cross-sectional shape and size of beams with different spans vary greatly. Different specifications of molds are required. The molds have poor versatility and amortization costs Most of the large and I-shaped beams are constructed by post-tensioning prestressing method. Not only is the construction process complicated, the production progress is slow, but also the cost is high. In addition, there are many joints between adjacent girders, which require high erection machinery, and the concrete layer needs to be leveled on the surface to further increase the self-weight of the bridge. I-shaped bridges are ge...

AI Technical Summary

Problems solved by technology

[0002] Girder bridges in traffic and municipal bridges basically use prefabricated I-shaped beams with diaphragms. The beams are self-heavy, and the cross-sectional shape and size of beams with different spans vary greatly. Different specifications of molds are required. The molds have poor versatility and amortization costs Most of the large and I-shaped beams are constructed by post-tensioning prestressing method. Not only is the construction process complicated, the production progress is slow, but also the cost is high. In addition, there are many joints between adjacent girders, which require high erection machinery, and the concrete layer needs to be leveled on the surface to further increase the self-weight of the bridge. I-shaped bridges are generally designed as simply supported girders, and the height of the girders increases. The slope length is increased, and the clearance under the bridge is reduced

A kind of inverted T-shaped factory prefabricated small and medium-span beams used in composite bridges has not been reported

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