Composite lining waterproof structure at shaft and tunnel joint

By employing a composite lining waterproof structure at the connection between the shaft and the tunnel, including initial shotcrete, composite geomembrane, water-swellable sealing strips, and expansion joint waterproof sealants, the continuity and sealing issues of the waterproof layer at the connection between the shaft and the tunnel were resolved. This achieved structural deformation adaptability and ease of construction, while reducing leakage risks and maintenance costs.

CN224496466UActive Publication Date: 2026-07-14SINOHYDRO BUREAU 11 CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SINOHYDRO BUREAU 11 CO LTD
Filing Date
2025-08-05
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

The existing waterproofing layer at the connection between the shaft and the tunnel is difficult to make continuous at the junction, resulting in poor sealing and easy cracking due to deformation. Repair is difficult and costly, and existing reinforcement methods are not effective.

Method used

A composite lining waterproof structure is adopted at the connection between the shaft and the tunnel, including initial shotcrete, composite geomembrane, water-swellable waterstop strip and expansion joint waterproof sealant, forming a zoned and layered waterproof system. The synergistic effect of flexible and rigid materials enhances the continuity and sealing of the waterproof layer.

Benefits of technology

It improves the continuity and sealing of the waterproof layer, reduces the risk of leakage, has good deformation adaptability, is easy to construct, reduces maintenance difficulty and cost, and extends the service life of the project.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224496466U_ABST
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Abstract

The utility model provides a kind of composite lining waterproof structure at the connection of shaft and tunnel, wherein, shaft primary shotcrete is set on shaft surface, tunnel primary shotcrete is set on tunnel surface, the surface of shaft primary shotcrete and tunnel primary shotcrete is covered with composite geomembrane and is set in joint area with lap joint;Tunnel secondary lining concrete is set on the surface of composite geomembrane in tunnel, shaft secondary lining concrete is set on the surface of composite geomembrane in shaft, the joint of tunnel secondary lining concrete and shaft secondary lining concrete forms expansion joint;Water-swelling sealing strip is filled in the central position of expansion joint, expansion joint waterproof seal is set in the area of expansion joint relative to water-swelling sealing strip outside.The structure has the advantages of reasonable structure, convenient construction, strong deformation adaptability and stable waterproof performance.
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