Construction Method of Bridge Structure in Negative Bending Moment Area of ​​Prestressed Concrete Beam

Abstract

The invention relates to a construction method of a bridge structure in a negative moment area of ​​a prestressed concrete beam, and relates to the technical field of bridge engineering. The construction method of the bridge structure in the negative moment zone of prestressed concrete girders includes: obtaining prefabricated T-beams and prefabricated bridge decks; A groove for installing the prefabricated bridge deck is formed in the negative bending moment area, and the prefabricated bridge deck is hoisted in the groove after connecting two adjacent girder ribs. Prestress is applied to the prefabricated bridge deck on one side, and then the prefabricated bridge deck on this side is connected to the corresponding wing plate and beam rib to form a whole and share the load. The above-mentioned construction method is simple and quick, and the obtained bridge structure in the negative moment area of ​​the prestressed concrete girder is reliable in stress, and has great use value and good economic benefits in the construction of new bridges and the renovation of old bridges.

Description

technical field [0001] The present application relates to the technical field of bridge engineering, in particular to a prestressed concrete beam negative moment area bridge structure and a construction method thereof. Background technique [0002] In recent years, the application of prestressed concrete in bridges has developed rapidly, and prestressing is often required in the negative moment area on the top of the pier. The traditional cast-in-place bridge deck applies prestressing methods by stretching the prestressed beams in the reserved panel tunnel. Each Both ends of the root prestressed beam need to be equipped with anchors. At the same time, additional processes such as hole retention, reinforcement penetration, grouting and anchor sealing are added during the construction. The construction process is complicated and the construction period is long, which hinders the development of urban public transportation. At the same time, the traditional prestressing post-ten...

AI Technical Summary

Problems solved by technology

[0002] In recent years, the application of prestressed concrete in bridges has developed rapidly, and prestressing is often required in the negative moment area on the top of the pier. The traditional cast-in-place bridge deck applies prestressing methods by stretching the prestressed beams in the reserved panel tunnel. Each Both ends of the root prestressed beam need to be equipped with anchors. At the same time, additional processes such as retaining holes, piercing bars, grouting, and anchor sealing are added during the construction. The construction process is complicated and the construction period is long, which hinders the development of urban public transportation.

At the same time, the traditional prestressing post-tensioning method, anchorage corrosion, sliding anchor, steel strand corrosion, fracture; tunnel blockage, tunnel offset, etc. lead to problems such as wire threading difficulties, resulting in poor economic efficiency of the traditional prestressing method, which does not meet the national advocacy The concept of rapid construction and assembly

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