Inside-hole water shutoff device used in detection of wall rock damage range in upward hole by means of sonic approach

Abstract

The invention discloses an inside-hole water shutoff device used in detection of the wall rock damage range in an upward hole by means of a sonic approach. The inside-hole water shutoff device prevents coupling water from flowing out along a drilling hole, simultaneously limits the water spreading range of the coupling water along cracks within the drilling hole with a specific length and effectively controls the spreading rate of the coupling water inside the drilling hole. The inside-hole water shutoff device is characterized by being composed of a rubber air bag (10), an air bag protection sleeve (9) and a ring-shaped ferrule (8), and the air bag protection sleeve is tied to a steel tube close to the outer side of the ring-shaped ferrule through adhesive tape (6). The inside-hole water shutoff device mainly has the advantages that the rubber air bag with good expansibility and toughness can fully fill a gap between the steel tube and the hole wall, the air bag protection sleeve can protect the rubber air bag from being damaged due to abrasion and can effectively restore an original shape after air is exhausted, the ring-shaped ferrule and the adhesive tape can effectively fix positions of the air bag protection sleeve and the rubber air bag and prevents the air bag protection sleeve and the rubber air bag from being pressed and overlapped together due to the fact that the steel tube is put in or pulled out.

Description

technical field [0001] The invention relates to a coupled water leak plugging technique for detecting the damage range of surrounding rock in an uphole during excavation construction of a tunnel (roadway). Background technique [0002] Bolt support is a surrounding rock reinforcement measure commonly used in tunnel (roadway) excavation construction. When selecting the length parameter of the bolt, the damage range of the surrounding rock under the influence of blasting and excavation is an important reference index; that is, whether the bolt is effective Anchoring in the stable rock formation is the key to whether the bolt can fully play the role of supporting and strengthening the surrounding rock. It is a simple, convenient and effective engineering field test method to detect the rock formation damage range in the borehole by using the acoustic wave method. This technology is very smooth when applied in downward holes, but when it is applied in upward holes, it involves ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing water blocking device cannot effectively control the diffusion of coupling water in the upward hole along the gap, the technical problem to be solved in the present invention is to design a water blocking device that can effectively control the loss and diffusion of coupling water in the upward hole, so as to ensure The amount of coupling water in the upward hole meets the test requirements

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