Friction type steel-concrete composite beam shear connecting key

Abstract

The invention provides a friction type steel-concrete composite beam shear connecting key. The shear connecting key comprises a prefabricated concrete bridge deck slab, prestressed high-strength boltsand a steel main beam. A plurality of columnar hole grooves are distributed in the prefabricated concrete bridge deck slab, the upper portions of the prestress high-strength bolts are connected withthe prefabricated concrete bridge deck slab in a penetrating mode through the hole grooves, and the lower portions of the prestress high-strength bolts are connected with the upper flange of the steelmain beam in a penetrating mode. Top nuts, top cushion blocks, middle nuts and middle cushion blocks are arranged at the joints of the prestress high-strength bolts and the upper plate face and the lower plate face of the prefabricated concrete bridge deck slab respectively. Bottom nuts are arranged at the lower ends of the joints of the lower portions of screws of the prestress high-strength bolts and the upper flange of the steel main beam. The top cushion blocks and the middle cushion blocks can generate elastic deformation in the bolt tightening process. The easy-to-disassemble shear connecting key with prestress is adopted to replace a traditional cast-in-place concrete permanent shear nail connecting mode, the construction efficiency is improved, the good anti-loosening capacity isachieved, and the service life of the concrete bridge deck slab is greatly prolonged.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a frictional steel-concrete composite beam shear connection key. Background technique [0002] The steel-concrete composite girder bridge refers to the bridge structure that connects the steel girder and the concrete bridge deck through the shear connection key and considers the joint force. Steel-concrete composite beams have superior mechanical properties and construction performance, good economy, and are suitable for small and medium-span bridges. In recent years, the proportion of steel-concrete composite girder bridges in newly built bridges in China is also gradually increasing. [0003] At present, steel girders and concrete decks of composite girders are mostly prefabricated in factories, and then wet joints are poured on site, and steel girders and concrete slabs are connected to work together as a whole through shear bonds. The shear key is the key structure of the ...

AI Technical Summary

Problems solved by technology

On the one hand, the construction efficiency of on-site pouring is low, the construction quality is difficult to guarantee, and it is difficult to meet the large demand of the current industrial production and assembly of composite beams; on the other hand, when the concrete bridge deck is partially damaged, it is difficult to maintain and repair, and the replacement process is complicated.

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