Tunnel crack secondary lining reinforcing method and device based on jet type cement-based composite material

Abstract

The invention discloses a tunnel crack secondary lining reinforcing method and device based on a jet type cement-based composite material, and belongs to the technical field of underground engineering. According to the method, reinforcement technology pretreatment for a cracked tunnel secondary lining and reinforcement spraying construction for the cracked tunnel secondary lining are conducted, and specifically, concrete on the surface of the cracked tunnel secondary lining is chiseled away in a segmented mode; inclined drilling treatment is conducted on the surface of the tunnel secondary lining which is obtained after chiseling treatment is accomplished; drilling is conducted on the surface of the tunnel secondary lining subjected to chiseling treatment again, and high-strength anchoringsteel nails are laid in holes; and finally, the cement-based composite material is sprayed to the surface of the treated tunnel secondary lining to conduct reinforcement. According to the reinforcingmethod, the disturbance to an original structure is small, the stability, the safety and the durability of the structure are guaranteed, the influence on tunnel operation is reduced, and the integrity of the tunnel lining is guaranteed. A stirring and spraying construction integration device with a screening function is adopted, and therefore the construction efficiency can be improved, and the situation that a newly-mixed mixture has the good working performance is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method and device for reinforcing the second lining of tunnel cracks based on sprayed cement-based composite materials. Background technique [0002] Concrete is widely used in tunnel engineering because of its wide range of raw materials, simple preparation process and high strength. But ordinary concrete is a brittle material, its toughness and ductility are extremely poor, and the ultimate tensile strain is about 0.01%. Although the importance of crack width control has gradually attracted attention in terms of the durability of infrastructure, it is not important in the design of concrete. Not enough attention has been paid to it. When the tensile strain of ordinary concrete is about 0.01%, the width of local cracks has exceeded 0.6mm, seriously affecting the bearing capacity and durability of the structure. [0003] Due to the low toughness and...

AI Technical Summary

Problems solved by technology

Utilize sprayable high-toughness, anti-seepage and low shrinkage cement-based composite materials to replace traditional concrete materials for tunnel cracked secondary lining reinforcement, fundamentally solve the cracking of tunnel lining and repeated cracking after reinforcement with ordinary concrete In addition, a new type of mixing and spraying construction integrated device was invented for the application of high toughness cement-based composite material spraying reinforcement, and a detachable stainless steel screen was attached to ensure the uniformity of aggregate particle size, solving the problem of high toughness, Problems of anti-seepage and low shrinkage cement-based materials in the construction process of mixing and spraying construction and improving construction efficiency

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