Railway line tunnel crossing coal mine goaf treatment method

By combining a specially designed grouting pipe with an exhaust hose and an expansion airbag, the problem of air emission during the grouting process is solved, ensuring the safety and quality of the grouting process, and achieving effective air removal and a reduction in the amount of work required.

CN117072203BActive Publication Date: 2026-07-14THE 8TH GRP OF CHINA RAILWAY 1ST ENG CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
THE 8TH GRP OF CHINA RAILWAY 1ST ENG CO LTD
Filing Date
2023-08-29
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In existing technologies, grouting pipes cannot effectively expel air from the goaf of coal mines, which leads to an impact on grouting pressure and an increase in construction workload. Furthermore, additional drilling or insertion holes cannot be effectively sealed, which may cause grout to flow out, affecting construction safety and quality.

Method used

A specially designed grouting pipe is used, combined with an exhaust hose and an expansion airbag. Air is discharged through an axial channel and an inflation passage. The detection components are used to monitor the condition of the goaf in real time to ensure the safety and effectiveness of the grouting process.

Benefits of technology

This method effectively removes air from the goaf during grouting, preventing increased air pressure, ensuring worker safety, reducing construction work, and improving grouting quality and safety.

✦ Generated by Eureka AI based on patent content.

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    Figure CN117072203B_ABST
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Abstract

The present application belongs to the technical field of underground mining area treatment, and particularly relates to a railway line tunnel crossing coal mine goaf treatment method, which comprises a grouting step, and a special grouting pipe is used in the grouting step, the special grouting pipe comprises a grouting pipe body and an exhaust hose, a channel for the exhaust hose to penetrate through is formed on the pipe wall of the grouting pipe body in the axial direction, and a detection port in communication with the channel is formed on the pipe wall of the grouting pipe body, a first inflatable air bag is arranged on the exhaust hose, and an inflation passage for inflating the first inflatable air bag is formed on the pipe wall of the exhaust hose in the axial direction; a detection assembly is arranged at the detection port, the detection assembly comprises a first distance sensor and an arc-shaped block matched with the detection port, the arc-shaped block is radially slidably connected to the detection port, the arc-shaped block is fixedly connected with the first inflatable air bag, an upper groove is formed on the arc-shaped block, and the first distance sensor is fixedly installed in the upper groove. The present application can not only grout and exhaust simultaneously, but also detect whether the goaf vault is subsided during the grouting process.
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Citation Information

Patent Citations

  • CN116427995A

  • CN209115120U