Shear force connecting part, combination beam comprising same and construction method of combination beam

Abstract

The invention provides a shear force connecting part, a combination beam comprising the shear force connecting part and a construction method of the combination beam, and relates to the technical field of support beam structures in a road bridge and a building. Aiming at the problems that according to an existing method, additional stress is exerted on a shear force connecting part, so that pre-pressing stress of a concrete slab is poor in effect, and according to a combination beam, stress weak links or corrosion channels exist on connecting interfaces of different materials, the connecting part comprises a pre-buried steel plate, and at least one set of high-strength bolt connection pairs is arranged on the pre-buried steel plate. Each high-strength bold connection pair at least comprises a bolt, a number-one fastening nut and a number-two fastening nut, wherein the number-one fastening nut is connected to the fixed end of the bolt, and the number-two fastening nut is connected to the free end of the bolt. The construction method includes the steps that step1, the free ends of the bolts in the shear connecting parts are buried in a poured concrete slab, and the number-one fastening bolts are loosened; step2, after the concrete slab reaches designed strength and an age, pre-stress tensioning is performed on the concrete slab; step3, the number-one fastening nuts are tightened, and construction of the combination beam is finished. The construction method is particularly suitable for constructing the support beams in the road bridge and the building.

Description

technical field [0001] The invention relates to the technical field of supporting beam structures in roads, bridges and buildings, in particular to a shear connector, a composite beam containing the shear connector and a construction method for the composite beam. Background technique [0002] Composite structure is a structure made of two or more materials in the same section or each member. It is widely used in the fields of roads, bridges and construction due to its advantages of reasonable material utilization and convenient construction. In recent years, continuous beams of composite structures have gradually replaced simply supported beams due to the advantages of comfortable driving, small building height, and good integrity, and have become the main expression form of beam bridges with composite structures. [0003] However, the concrete in the negative moment area of ​​the continuous beam of the composite structure is prone to cracking under tension. To solve this p...

AI Technical Summary

Problems solved by technology

Although the post-combination bridge deck prestressing tendon method can realize prestressing alone on the concrete bridge deck 21, and the steel girder 20 does not bear any load, but the interface between the high-strength mortar and concrete will inevitably remain due to the difference in material and age. The weak link under stress, moreover, the mortar layer at 23 places of post-pouring zone still can not apply prestressing force

[0010] Please see attached image 3 , using high-strength bolts 42 as the connectors between the concrete slab 41 and the steel beam 40, although the post-casting belt can be omitted to realize prestressing on the entire section of the concrete slab 41, but the contact part between the concrete slab 41 and the top of the steel beam 40 is due to The connection is not tight, leaving a corrosion channel that is unfavorable to the anticorrosion of the steel beam 40, and with the shrinkage and creep of the concrete, the pretightening force of the high-strength bolt 42 will be further lost, and finally affect the connection between the steel beam 40 and the concrete slab 41. The method is only found in the literature and has no practical application

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