Shield construction method based on oversized-diameter shield tunnel segment floating control

By optimizing parameters such as excavation posture, excavation pressure and grouting management in the construction of super-large diameter shield tunnels, the problem of pipe sheet floating is solved and the quality and stability of tunnel molding are improved.

CN119712130AActive Publication Date: 2025-03-28CHINA RAILWAY TUNNEL GROUP CO LTD +1
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Patent Information

Application Number
CN202411610012.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-12
Publication Date
2025-03-28
Estimated Expiration
2044-11-12

AI Technical Summary

Technical Problem

During the construction of an ultra-large diameter shield tunnel, the pipe sheet has serious problems, which can easily lead to leakage of pipe sheets, staggered stages, damage and tunnel ellipticity exceeding the standard, affecting the overall performance and long-term stability of the tunnel.

Method used

Effectively control the floating of the pipe sheet by optimizing the shield construction process and parameters, including controlling the excavation posture, setting the excavation pressure, optimizing the grouting management system, synchronous grouting and secondary grouting behind the pipe sheet, advance grouting, radial grouting of the shield machine and bolt retightening.

Benefits of technology

It realizes effective control of the floating of the pipe sheet of the ultra-large diameter shield tunnel, improves the quality of tunnel forming, reduces construction risks and uncertainties, and ensures the overall stability and waterproof performance of the tunnel.

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Abstract

The invention discloses a shield construction method based on oversized-diameter shield tunnel segment floating control, and aims to solve the technical problem of how to ensure the forming quality of an oversized-diameter shield tunnel. According to the construction method, targeted and comprehensive optimization is carried out on the aspects of shield posture, tunneling pressure setting, grouting pipeline improvement, duct piece back filling, advanced grouting, shield tunneling machine radial grouting, bolt retightening and the like, floating of the ultra-large-diameter shield tunnel duct piece is effectively controlled, it is guaranteed that shield tunnel forming reaches the standard, and the construction efficiency is improved. Meanwhile, the technical scheme of the invention has the advantages of low input cost, high feasibility, wide application range and the like.
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