A transverse splicing structure of a concrete continuous box girder bridge and its construction method

Abstract

The invention discloses a transverse splicing structure of concrete continuous box girder bridges and a construction method for the transverse splicing structure. The transverse splicing structure of the concrete continuous box girder bridges comprises a corrugated steel plate located at the splicing seam position of adjacent box girder bridge flange plates, and the corrugated direction of the corrugated steel plate and the length direction of the splicing seam are consistent; the corrugated steel plate is fixedly connected with the box girder bridges on the two sides through transverse connecting reinforcing bars, one ends of the transverse connecting reinforcing bars are fixed into the adjacent box girder bridge flange plates, the other ends of the transverse connecting reinforcing bars are fixedly connected with the corrugated steel plate, and the transverse connecting reinforcing bars and longitudinally distributed reinforcing bars at the two sides of corrugated steel plate are welded to form a reinforcement cage; and the space between corrugations of the corrugated steel plate is filled with asphalt sand with the wonderful elasticity, other areas of the splicing seam is filled with elastic concrete, and a post-pouring joint flush with the flange plates on the two sides is formed. According to the transverse splicing structure arranged between the flange plates of a new concrete box girder bridge and an old concrete box girder bridge, not only can the longitudinal deformation difference between main structures of the new concrete box girder bridge and the old concrete box girder bridge be absorbed, but also the transverse internal force and a related deformation difference between the new box girder bridge and the old box girder bridge are borne.

Description

technical field [0001] The invention belongs to the technical field of bridge structures, and relates to a transverse widening project suitable for concrete continuous box girder bridges in highway bridges and urban viaducts, in particular to a transverse widening project suitable for concrete continuous box girder bridges with a total length of more than 100 meters. Splicing widening project. Background technique [0002] In recent years, with the rapid development of our country's national economy, the traffic industry has flourished, and the rapid increase in traffic volume has posed new challenges to the capacity of existing public transport facilities. The highway bridges built in recent years have experienced traffic congestion to varying degrees after several years of service, which has affected the traffic capacity and service level of the road to a certain extent. Therefore, while building new roads, the country is also vigorously carrying out reconstruction and ex...

AI Technical Summary

Problems solved by technology

[0005] In the lateral splicing and widening of prestressed concrete continuous box girder bridges, due to the large shrinkage and creep deformation values ​​of the newly built bridge materials, there is a huge difference in longitudinal deformation between the old and new bridges, which causes a large gap between the girder ends of the continuous box girder bridge. The large lateral deformation and the extrusion of the anti-seismic blocks on the side-span pier cap girders cause structural safety problems. It is urgent to propose a new type of concrete continuous box girder bridge transverse splicing structure to bear and consume the old and new continuous box girder bridges. large longitudinal deformation difference

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