A method and structure for anchoring a support structure for a soil tunnel division construction

By using an anchoring method of outer casing and steel perforated pipe in the sub-construction of soil tunnels, the problem of support structure deformation caused by grout backflow was solved, the stability of the support structure and construction efficiency were improved, and the safety and progress of the tunnel were ensured.

CN122129280APending Publication Date: 2026-06-02CHINA RAILWAY NO 2 ENG GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA RAILWAY NO 2 ENG GROUP CO LTD
Filing Date
2026-04-28
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

During the construction of soil tunnel sections, backflow of grout during high-pressure grouting of anchor pipes can cause deformation or damage to the support structure, affecting its stability and connection, leading to delays in construction progress and safety risks.

Method used

An outer sleeve is inserted into the lower part of the support structure and grout is injected to form solidified grout. Cement grout is then injected into the duct through a steel perforated pipe to form an anchoring structure, reducing grout backflow and improving the strength and stability of the support structure.

Benefits of technology

It achieved stable connection of the support structure and smoothness of the load-bearing structure, reduced deformation risk, shortened construction period and saved costs.

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Abstract

This invention relates to the field of tunnel construction technology, and particularly to a method and structure for anchoring a support structure in the construction of a soil tunnel. The anchoring method includes the following steps: S1. Inserting an outer sleeve into the lower part of the support structure, the outer sleeve passing through the support structure and partially extending into the surrounding rock; fixing the outer sleeve and the support structure; S2. Injecting grout into the cavity of the outer sleeve, the grout solidifies to form a solidified grout; S3. Drilling a hole into the solidified grout from the end of the outer sleeve, the hole partially extending into the surrounding rock, inserting a steel perforated pipe into the hole, the steel perforated pipe protruding from the end of the solidified grout away from the support structure, and the sidewall of the protruding part having several perforated holes; fixing the steel perforated pipe and the outer sleeve; S4. Injecting cement grout into the cavity of the steel perforated pipe. This invention not only reduces grout backflow through the low permeability of the solidified grout, but also prevents backflowing grout from flowing into the space between the support structure and the surrounding rock, thereby avoiding excessive pressure on the support structure caused by backflowing grout, which could lead to deformation or damage to the support structure.
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