Convex tunnel portal ring beam structure of shield tunnel

Through the outward-convex portal ring beam structure, the problems of water and sand gushing in the construction of traditional portal ring beams are solved by using pipe segment steel plates, sealing steel plates and liquid slurry filling, achieving safer and more reliable tunnel construction and avoiding damage to the original pipe segments.

CN223398673UActive Publication Date: 2025-09-30CHINA TUNNEL CONSTRUCTION CO LTD GUANGDONG
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Patent Information

Application Number
CN202422973268.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-04
Publication Date
2025-09-30
Estimated Expiration
2034-12-04

AI Technical Summary

Technical Problem

During the construction of the portal ring beam, the traditional lined portal ring beam requires the removal or cutting of the tunnel segments, which may lead to water and sand gushing accidents, affecting construction safety and the environment.

Method used

An outward-convex portal ring beam structure is adopted. By setting a segment steel plate protruding outside the tunnel segment and welding the sealing steel plate to the tunnel steel ring, an annular gap is formed and filled with slurry. Combined with water-swelling waterstop strips and long bolts, the connection is ensured to be tight and dense.

Benefits of technology

It avoids water and sand gushing accidents caused by cutting and removing pipe segments, improves construction safety and quality, reduces construction risks, and ensures tunnel sealing through grouting.

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Abstract

A convex tunnel portal ring beam structure of a shield tunnel comprises a station main body structure, a tunnel portal segment and a tunnel portal ring beam, the tunnel portal segment protrudes out of a tunnel portal of the station main body structure, a segment steel plate is annularly arranged on the back of the tunnel portal segment, and a tunnel portal steel ring is annularly arranged at the tunnel portal of the station main body structure; a blocking steel plate is welded between the pipe piece steel plate and the hole opening steel ring, so that an annular gap is formed between the hole opening pipe piece and the hole opening, the annular gap is filled with slurry, and the side wall of the end of the hole opening ring beam is arranged on the station main body structure, the hole opening pipe piece and the blocking steel plate. The structure adopts the convex portal ring beam, is good in quality, safe and reliable, cannot be influenced by the length of the original tunnel portal segment extending out of the portal end, does not need to damage the original segment in the tunnel, avoids water gushing and sand gushing accidents caused by cutting and dismantling the segment, and achieves the effects of reducing construction risks, being large in construction space and simultaneously reducing construction cost. And through grouting, it can be guaranteed that annular gaps behind the tunnel segment wall are densely filled, and water seepage is prevented.
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