Shield launching construction method suitable for narrow space

By installing portal steel rings and splicing extension steel rings at the starting end of the shield tunnel shaft, the problem of insufficient starting space for the shield machine in a confined space was solved, achieving a sealing effect and ensuring construction safety and efficiency.

CN121576087APending Publication Date: 2026-02-27ERCHU CO LTD OF CHINA RAILWAY TUNNEL GRP +3
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Patent Information

Application Number
CN202610107470.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-27
Publication Date
2026-02-27

AI Technical Summary

Technical Problem

In confined spaces, the effective extension length of the steel ring at the tunnel entrance is limited, resulting in insufficient space for the tunnel boring machine to launch and making it impossible to seal. This leads to the risk of mud and water leakage and soil loss, affecting construction safety and efficiency.

Method used

A portal steel ring is installed at the starting end of the shield tunnel, and an extension steel ring is spliced ​​to it. Sealing components are installed, and a demolition platform is erected. The underground continuous wall at the starting end is demolished layer by layer from top to bottom to ensure sealing and safe construction.

Benefits of technology

By extending the steel ring and splicing it with the portal steel ring, the insufficient effective length in the narrow space was compensated for, the shield machine was sealed, mud and water leakage and soil loss were avoided, and the shield machine launch was guaranteed to proceed smoothly.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a shield launching construction method suitable for a narrow space, and relates to the technical field of shield tunnel construction, and the shield launching construction method comprises the following steps: carrying out soil reinforcement construction in a specified construction area in a shield launching operation area; carrying out precipitation construction in the shield launching operation area; a tunnel portal steel ring is installed on an underground diaphragm wall at the starting end of the shield well, and the extending steel ring and the tunnel portal steel ring are spliced, so that the side, away from the tunnel portal steel ring, of the extending steel ring is sealed with a notch ring of a shield tunneling machine; a breaking operation platform is built in the shield well, the starting end underground diaphragm wall with the specified breaking thickness within the tunnel portal steel ring range is broken in four layers from top to bottom, the breaking operation platform is synchronously dismantled in a layered mode, and shield starting construction in the narrow space is completed; the extension steel ring is spliced on the outer side of the tunnel portal steel ring, so that the defect that the effective extension length of the tunnel portal steel ring of a narrow shield well is insufficient is overcome, the tunnel portal steel ring can be sealed with a notch ring of a shield tunneling machine, and smooth shield launching is guaranteed.
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Citation Information

Patent Citations

  • Narrow space shield construction machine starting method

    CN106988754A

  • Metro shield tunnel extension steel ring initial construction method

    CN108561140A

  • Starting method of shield special-shaped extension steel ring

    CN112412481A

  • Upper and lower well channel for constructing ultra-deep vertical shaft by reverse construction method and construction method thereof

    CN112922029A

  • Tunnel portal extension steel ring starting tunneling construction method

    CN113107501A