Hybrid beam box girder bridge longitudinally spliced by shear keys and construction method

Abstract

The invention relates to a hybrid beam box girder bridge longitudinally spliced by shear keys and a construction method. The box girder bridge is formed by splicing box girder sections of a prestressed concrete girder section and an ultra-high performance concrete girder section through longitudinal prestress in the longitudinal bridge direction. Protruding shear keys made of ultra-high-performance concrete materials are arranged at the two ends of the ultra-high-performance concrete beam section, round holes allowing longitudinal steel bars to penetrate through and reserved longitudinal prestress openings are formed in the cross section of the beam section, and the ultra-high-performance concrete beam section is a prefabricated part of a hollow prefabricated plate type structure. The prestressed concrete beam section is cast in situ. By arranging the shear keys made of the ultra-high performance concrete, the problem that under the action of long-term repeated loads, an original common concrete shear key structure is prone to abrasion and damage is solved; compared with existing common concrete shear key connection, longitudinal connection of the box girder bridge with the longitudinally-spliced segments through the method is safer and more reliable.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a hybrid girder box girder bridge longitudinally joined by shear keys and a construction method thereof. Background technique [0002] The segmental prefabrication technology of box girder is also called segmental prefabrication technology and segmental prefabrication assembly technology. Compared with the overall prefabrication technology, the segmental prefabricated bridge has many advantages, such as fast construction progress and little impact on commuting around the bridge. The joint is the key structure that affects the mechanical performance, especially the durability performance of the segmented bridge. Most of the existing bridges are equipped with shear key joints at the joints between box girder sections to achieve shear performance. Existing research results show that the shear performance between box girder segments can be improved by increasing the numb...

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Problems solved by technology

However, the research results also show that the failure form of the joint is usually manifested as the relative displacement of the joint surface under the shear load, which causes the cracking of the concrete key tooth, and finally the crack penetrates and the shear key is sheared.

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