Precast box girder hogging moment reinforcing rib and construction technology

Abstract

The invention discloses a precast box girder hogging moment reinforcing rib and a construction technology, and belongs to the technical field of precast box girder construction. The precast box girderhogging moment reinforcing rib and the construction technology comprise a precast box girder and further comprise a corrugated pipe and a square reinforcement cage, and the square reinforcement cageis composed of a plurality of reinforcing main ribs, reinforcing stirrups and dense stirrups; the plurality of reinforcing main ribs are transversely arranged, the plurality of reinforcing stirrups and the plurality of dense stirrups are longitudinally arranged, the plurality of dense stirrups are symmetrically arranged on the two sides of the square reinforcement cage, and the plurality of reinforcing stirrups are arranged between the dense stirrups on the two sides. According to the precast box girder hogging moment reinforcing rib and the construction technology, the problems that when thereinforcing ribs in the hogging moment area of the prefabricated box girder and concrete are not compact and are tensioned, prestress loss, anchor bearing plate tension fracture and sinking occur, deformation is too large, and safety accidents are caused are solved, and smooth construction of bridge engineering which is simply supported first and then is continuous is guaranteed.

Description

technical field [0001] The invention relates to the field of prefabricated box girder construction, in particular to a prefabricated box girder negative moment reinforcement and construction technology. Background technique [0002] The post-tensioning prestressing of the box girder is an important part of determining the bearing capacity of the bridge. The tensioning of the prestressing depends not only on the quality of the raw materials, but also requires the accuracy of the location of the prestressing tunnel and the sufficient bearing strength of the concrete behind the anchor plate. Since the thickness of the top plate of the box girder is generally relatively thin, if the positioning is not accurate, problems such as uneven force will easily occur when the bridge deck is stretched by negative bending moment. [0003] Due to the inaccuracy of the negative moment tensioning channel and the weak bearing capacity of the concrete behind the anchor plate, the stress loss of...

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Problems solved by technology

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a prefabricated box girder negative moment reinforcement and construction technology, which solves the problem that the prefabricated box girder negative moment area reinforcement and concrete are not dense and stretched. Loss of prestress, cracking of the anchor plate, and indentation, resulting in excessive deformation and safety accidents, ensured the smooth construction of bridge projects that are simply supported first and then continuous

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