Friction type steel-concrete composite beam shearing force connecting key and steel-concrete composite beam and construction method thereof

Abstract

The invention relates to the technical field of bridge engineering, in particular to a friction type steel-concrete composite beam shearing force connecting key and steel-concrete composite beam and a construction method thereof. The friction type steel-concrete composite beam shearing force connecting key and steel-concrete composite beam comprises a prefabricated bridge deck slab, a steel beam and a prestress high-strength bolt.The prestressed high-strength bolt is threaded and connected with a fixing seat with a convex longitudinal section. The diameter of the upper end of the fixing seat is larger than that of the lower end. The lower portion of the fixing seat extends into the mounting hole, the upper portion of the fixing seat abuts against the bottom of the mounting groove, the upper end of the prestressed high-strength bolt is coaxially connected with a pressing plate capable of rotating relatively, a plurality of axial adjusting holes are annularly formed in the top end face of the fixing seat at intervals, and a locking rod capable of moving up and down is arranged in each adjusting hole. The top end of the locking rod extends upwards from the adjusting hole and is connected with the pressing plate, the side wall of the lower portion of the adjusting hole is provided with a notch communicated with a mounting hole in the outer side of the fixing seat, and a plurality of supporting blocks are annularly arranged on the peripheral face of the lower portion of the fixing seat at intervals. More stable and reliable shearing resistance can be provided, and a good connecting effect is formed between the bridge deck slab and the steel beam.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a frictional steel-concrete composite beam shear connection key, a steel-concrete composite beam and a construction method thereof. 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 togethe...

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.

[0004] Chinese patent CN210975504 provides a friction type steel-concrete composite beam shear connection key, which presses and clamps the bridge deck through the elastic deformation of the top pad and middle pad of prestressed high-strength bolts, but because the pads are arranged symmetrically in multiple pieces In consideration of the product processing error, one end of all pads is likely to be unable to be flush with each other, that is, when a certain pad is in contact with the bridge deck, other pads may not be in contact with the bridge deck , or the accuracy of the grooves on the bridge deck is not enough, resulting in uneven bottom surface of the groove. At this time, each pad will not be in contact with the bottom of the groove at the same time. Even if the bolts are finally tightened to make each pad press the bridge deck, However, due to the different friction between each pad and the bridge deck, the shear resistance effect of the entire shear connection will eventually be unsatisfactory

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