Ultra-high performance concrete slab joint connection structure and its construction method

Abstract

The invention relates to an ultra-high performance concrete slab seam connecting structure and a construction method thereof. The ultra-high performance concrete slab seam connecting structure comprises two ultra-high performance concrete slabs positioned in the same plane, wherein a cast-in-situ seam is left in the middle between the two ultra-high performance concrete slabs; a high-strength steel wire mesh is arranged in each ultra-high performance concrete slab; one side, facing the cast-in-situ seam, of the high-strength steel wire mesh penetrates out from the lateral part of the same sideof the ultra-high performance concrete slab and extends into the cast-in-situ seam; the extending-out parts of the high-strength steel wire meshes at two sides are connected through a high-strength steel wire mesh sheet; and an ultra-high performance concrete slab seam plate for connecting the ultra-high performance concrete slabs at two sides is cast in the cast-in-situ seam. The ultra-high performance concrete slab seam connecting structure has the advantages that the stress is reasonable; the strength is high; the structure dead weight can be greatly reduced; the mechanical property is excellent; the durability is high; the problem of damage of concrete slabs and concrete slab seam regions is effectively solved; the capability of high strength, high toughness and crack resistance of the ultra-high performance concrete is fully realized; and great practical values and good economic benefits are realized in the engineering practice.

Description

technical field [0001] The invention relates to an ultra-high-performance concrete slab joint connection structure and a construction method thereof, belonging to the field of civil engineering. Background technique [0002] Ultra-high performance concrete (UHPC) is a high-strength, high-modulus, high-ductility ultra-high-performance fiber-reinforced cement composite material, also known as reactive powder concrete (RPC), which is composed of cement, sand, active admixtures, Steel fiber, high-efficiency water reducer and water are configured according to the theory of maximum density, which minimizes the internal defects of the material. Compared with ordinary concrete, UHPC has almost zero porosity, high impermeability coefficient, and excellent ultra-high mechanical properties. Usually UHPC has a compressive strength of not less than 130MPa and an axial tensile strength of not less than 8MPa, and the tensile strength can be further enhanced by adding a certain volume of s...

AI Technical Summary

Problems solved by technology

However, the thin ultra-high performance concrete slab reduces the joint size between the slabs, so that some existing connection structures cannot meet the design requirements well, especially the slab structure subjected to bending and tension, in the transmission of bending moment At the same time, what needs to be transmitted more is the tension, and the unsuitable connection structure will easily cause cracks at the seams

However, the bonding interface between threaded steel bars and concrete commonly used in engineering will have obvious stress concentration, which is a sensitive position in structural design, and it also affects the popularization and application of thin-layer ultra-high performance concrete in the field of building structures and long-span bridges , how to solve the existing engineering practice problems and improve the connection performance at the seam is the focus of the research

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