An automatic control device for secondary grouting in tunnel boring machines

By designing an adjustable control mechanism and a removable sealing ring, the automatic control device for secondary grouting of shield tunnels solves the problems of easy wear and difficulty in replacement of the sealing structure, and achieves efficient and safe grouting control, which is suitable for tunnel and subway construction.

CN224515198UActive Publication Date: 2026-07-17CIVIL ENG OF CHINA CONSTR SECOND ENG BURESU
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CIVIL ENG OF CHINA CONSTR SECOND ENG BURESU
Filing Date
2025-07-29
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing tunnel boring machine (TBM) construction, the sealing structure of the grouting control device is prone to wear and aging, leading to leakage problems. Furthermore, the sealing rings are difficult to replace, increasing maintenance costs and downtime, and affecting construction efficiency and safety.

Method used

Design an adjustable control mechanism comprising a housing, pipes, control pipes, and a valve plate. Employ a removable sealing ring to achieve precise flow control and sealing performance. It also features shock absorption. The valve plate and limit ring fit tightly together to prevent leakage. The sealing ring is replaceable and adaptable to different geological environments.

Benefits of technology

It improves the stability and controllability of grouting operations, prevents grout leakage, reduces maintenance costs, extends equipment life, and enhances construction efficiency and safety. It is suitable for tunnel and subway construction in complex geological environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the field of automatic grouting control technology, specifically disclosing an automatic control device for secondary grouting in tunnel boring machines (TBMs). The device includes a first grouting pipe, a control mechanism at one end of the first grouting pipe, and a second grouting pipe located on the side of the control mechanism away from the first grouting pipe. This utility model provides an automatic control device for secondary grouting in TBMs, which features a compact structure, convenient operation, and good sealing performance. By adjusting the control components, precise control of the grouting flow rate can be achieved, adapting to different construction requirements. A shock-absorbing structure is incorporated to improve operational stability. The seals are replaceable, facilitating maintenance and extending service life. The overall device improves grouting efficiency and quality, is suitable for TBM construction in complex geological environments, and has strong practicality and broad application prospects.
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