A grouting device for karst tunnel cave

By improving the structure of the grouting device and using high-pressure air to seal the gaps around the grouting pipe, the problem of grout leakage in karst tunnel construction was solved, achieving efficient and dense grouting and preventing material waste and construction pollution.

CN224351971UActive Publication Date: 2026-06-12THE SECOND BRANCH LIAONING ROAD & BRIDGE CONSTR GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
THE SECOND BRANCH LIAONING ROAD & BRIDGE CONSTR GRP CO LTD
Filing Date
2025-08-11
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

In existing technologies, the annular gap between the grouting pipe and the borehole wall is difficult to seal effectively during karst tunnel construction, leading to grout leakage, material waste, and construction pollution. Furthermore, the filling is not dense, which weakens the penetration ability to distant fissures.

⚗Method used

A grouting device was designed, including a grouting pipe, an end, a joint, an outer sleeve, a cover, a bottom ring, and an air inlet pipe. The gap around the grouting pipe is sealed by high-pressure air, and a soft cover and a silicone gasket are used to press tightly against the tunnel wall under high pressure to form a seal and prevent grout from seeping out.

🎯Benefits of technology

It effectively prevents grout leakage, avoids material waste and construction pollution, ensures dense filling of grout, and improves the repair effect of karst caves.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of grouting device for karst tunnel cave, including grouting pipe, end, joint, the bottom end of grouting pipe is fixedly connected with end, the inside diameter of end gradually converges from top to bottom, the top of grouting pipe is fixedly connected with joint;The outer surface of grouting pipe is fixedly connected with outer cover.The utility model has the advantages that: grouting pipe outer wall fixed place fixedly connected with an outer cover, the outside of outer cover is connected with soft cover, the bottom edge of cover is fixedly connected with a bottom ring, the bottom of bottom ring is fixedly connected with a circle of gasket, with multiple chemical bolts or expansion bolt is driven into tunnel wall, so that gasket is tightly sealed in tunnel wall, and the periphery of grouting pipe is sealed, grouting pipe is driven into borehole, opens plug, passes through air inlet pipe and is inhaled high-pressure air into cover, since there is high-pressure air in cover, slurry can be effectively prevented from overflowing from borehole, effectively prevent the condition of slurry leakage occurs.
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