A Prefabricated Box Girder Negative Moment Stiffener and Its Construction Technology

Abstract

The invention discloses a prefabricated box girder negative moment reinforcing rib and construction technology, belonging to the technical field of prefabricated box girder construction. The prefabricated box girder negative bending moment reinforcing rib and construction technology include prefabricated box girder, bellows and square reinforcement cage , the square reinforcement cage is composed of a plurality of reinforced main bars, reinforced stirrups and encrypted stirrups, a plurality of the reinforced main bars are arranged horizontally, a plurality of the reinforced stirrups and a plurality of the encrypted stirrups are arranged vertically, wherein, A plurality of the denser stirrups are arranged symmetrically on both sides of the square reinforcement cage, and a plurality of the reinforced stirrups are arranged between the denser stirrups on both sides. The invention discloses a prefabricated box girder negative moment reinforcing rib and its construction technology, which solves the problems of prestress loss, anchor plate cracking and indentation when the reinforcing rib and concrete in the negative bending moment area of ​​the prefabricated box girder are not dense and stretched. , resulting in excessive deformation and safety accidents, ensuring the smooth construction of bridge projects that are simply supported first and then continuous.

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 rib 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 los...

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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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