Prefabricated concrete beam wet joint connecting structure

Abstract

The invention discloses a prefabricated concrete beam wet joint connecting structure. The prefabricated concrete beam wet joint connecting structure comprises prefabricated concrete beams and cast-in-place wet joint concrete poured between the prefabricated concrete beams in a cast-in-place mode; each prefabricated concrete beam comprises in-beam prefabricated concrete and lapped rebars pre-embedded into the in-beam prefabricated concrete; dovetail-shaped tenons are arranged in the middle of the splicing side of the in-beam prefabricated concrete in the length direction; and the lapped rebarsare pre-embedded into the in-beam prefabricated concrete at intervals in the length direction of the prefabricated concrete beams, and the lapped rebars and the corresponding lapped rebars in the opposite prefabricated concrete beams are connected in joints. According to the prefabricated concrete beam wet joint connecting structure, the tenons are formed in the splicing faces of the prefabricatedconcrete beams, two-direction self-locking is jointly formed by using vertical and transverse shrinkage of the cast-in-place wet joint concrete, and the durability of prefabricated concrete beam connecting is improved; and part of the lapped rebars extending into the joints are pre-embedded into the prefabricated concrete beams, and the transverse connection strength of wet joint connection of the cast-in-place wet joint concrete is improved.

Description

technical field [0001] The invention relates to the technical field of prefabricated concrete beam assembly, in particular to a prefabricated concrete beam wet joint connection structure. Background technique [0002] Prefabricated assembled concrete beams are conducive to improving project quality, shortening project construction period, saving construction materials, reducing project cost, and improving comprehensive social and economic benefits. It has always been the main component of small and medium-span conventional bridge construction. Due to the limitations of transportation, hoisting and other capabilities, prefabricated concrete beams are generally prefabricated in pieces and assembled on site to form a whole. After installing auxiliary facilities, they can be opened to traffic for operation. Because the flange plate connection of precast concrete beams has a small overall on-site engineering volume and convenient construction, it is the preferred connection form ...

AI Technical Summary

Problems solved by technology

The shrinkage of the cast-in-place concrete begins to occur at this time. If the interface between the precast concrete beam and the cast-in-place wet joint concrete is not handled properly, the tension generated by the shrinkage of the cast-in-place concrete will cause gaps between the two at the interface where the bond is weakest. Cause rainwater, sprinkler cleaning water, etc. to infiltrate along the gap, causing corrosion of steel bars and affecting the durability of bridges

In addition, the vertical surface used on the surface of the precast concrete beam and the surface of the cast-in-place wet joint is often poorly bonded and occluded at the interface, and water seepage leads to corrosion of the steel bar, which affects the durability of the structure.

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