Soft water-rich stratum tunnel structure repairing pretreatment device and method

Abstract

The invention discloses a soft water-rich stratum tunnel structure repairing pretreatment device and method. The device comprises a pipe head, a pipe body and a pipe tail which are detachably connected. A first grouting channel, a second grouting channel and a third grouting channel are sequentially communicated in a sealed mode. The front end of the first grouting channel is fixedly connected with an elastic swim ring type plugging bag, and a one-way valve is arranged at the front end of a first inner pipe; and the swim ring type plugging bag is used for expanding in volume when grouting is conducted through a grouting opening in the rear end of the third grouting channel, and after grout in the swim ring type plugging bag is rapidly solidified into a stone body, a breach is pressed and covered from a cavity in the outer side of a supporting structure so as to temporarily stop water gushing and sand gushing. According to the soft water-rich stratum tunnel structure repairing pretreatment device and method, the swim ring type plugging bag can be quickly solidified and pressed at the breach after being expanded, then a stratum is repaired through single liquid grout, and quick pretreatment of the water and sand gushing breach is achieved.

Description

technical field [0001] The invention belongs to the technical field of tunnel restoration pretreatment, and in particular relates to a tunnel structure restoration pretreatment device and method in weak water-rich strata. Background technique [0002] In the field of tunnel engineering, the construction of supporting structures (primary support and lining) is often affected by factors such as geological conditions, construction equipment, construction technology and management standards, and local defects may appear. Especially when there is water leakage in weak water-rich formations, if the water pressure is high or there are karst caves, etc., it is likely to cause water gushing and sand gushing, which will lead to formation loss, forming a cavity behind the supporting structure, and then entering The vicious cycle of "water gushing and sand gushing—formation loss forming cavities—hydraulic channel expansion—increasing water gushing and sand gushing—increasing formation l...

AI Technical Summary

Problems solved by technology

[0004] However, using sandbags to backpressure the breach or partially backfill the tunnel requires mobilizing a large amount of manpower and material resources, and the repair time is long, and in some cases it may even take several months, which will greatly increase the comprehensive cost of construction

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