Retrograde sectional grouting device with a single grouting-stop plug and method applicable to fractured rock masses

Abstract

The invention discloses a retrograde sectional grouting device with a single grouting-stop plug and a method applicable to fractured rock masses. The retrograde sectional grouting device comprises aninner pipe, an output pipe, a water injecting pipe, the expansion-type grouting-stop plug, an inner pipe valve, an outer pipe valve, a water injecting valve, an inner pipe one-way valve and an outer pipe one-way valve, wherein the expansion-type grouting-stop plug is penetrated by the outer pipe and fixed on the outer pipe, the water injecting pipe is communicated with the interior of the expansion-type grouting-stop plug, water can be injected into the expansion-type grouting-stop plug through the water injecting water to enable the expansion-type grouting-stop plug to expand, the outer pipeis used for delivering cement grout, the outer pipe valve is arranged at the grout inlet position of the outer pipe, the outer pipe one-way valve is arranged at the grout outlet position thereof to prevent grout from flowing back, the inner pipe is arranged in the outer pipe and used for delivering water slurry, the inner pipe valve is arranged at the slurry inlet position of the inner pipe, and the inner pipe one-way valve is arranged at the slurry outlet position of the inner pipe to prevent the slurry from flowing back.

Description

technical field [0001] The invention relates to the field of grouting reinforcement and water blocking in geotechnical engineering, in particular to a single grout stop retreating segmented grouting device suitable for cracked rock mass and a use method thereof. Background technique [0002] In underground engineering, grouting is an effective means to strengthen fractured rock mass and seal groundwater. Compared with ordinary grouting, segmental grouting can achieve a more uniform grout diffusion range, and the grouting effect is better. Especially for strata with strong heterogeneity, segmental grouting has more significant advantages than ordinary grouting. The retreating grouting method is an important method to realize segmental grouting. The current retreating segmental grouting methods mainly include drill pipe retreating type and sleeve valve pipe retreating type. In the grouting method, the drill pipe is used to form holes at one time, and the drill pipe is directl...

AI Technical Summary

Problems solved by technology

The retreating grouting method is an important method to realize segmental grouting. The current retreating segmental grouting methods mainly include drill pipe retreating type and sleeve valve pipe retreating type. In the grouting method, the drill pipe is used to form holes at one time, and the drill pipe is directly used as the grouting pipe, and the retreating segmental grouting is realized by retreating the drill pipe. However, this grouting method lacks effective isolation measures between different grouting sections, resulting in The controllability of the slurry is limited, and it cannot be guaranteed that all the slurry enters the target grouting section; the sleeve valve tube retreat type grouting is mainly composed of two types of grouting tubes: the grouting outer tube and the grouting core tube. Both ends of the grouting core tube are There is a grout stopper, and the movement of the inner core tube is used to achieve segmentation, and the grout enters the injected medium between the two grout stoppers. However, the sleeve valve tube retreat type grouting method requires the use of two grout stoppers, resulting in a more complex structure. Complex, prone to damage to components during large-scale grouting construction, reducing grouting efficiency

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