Advanced grouting construction method for large-shield long-distance passing through high-speed roadbed hole

By using advanced drilling rigs and dual-liquid grouting technology to reinforce the soil above the shield cutterhead during shield tunneling, the problem of soil deformation when the shield tunnel passes through soft upper and hard lower strata was solved, achieving efficient and safe construction results and reducing construction costs and time.

CN121473844APending Publication Date: 2026-02-06CHINA RAILWAY 22ND BUREAU GROUP CORP LTD +2
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Patent Information

Application Number
CN202511603169.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-04
Publication Date
2026-02-06

AI Technical Summary

Technical Problem

When tunnel boring machines (TBMs) traverse complex strata with soft upper layers and hard lower layers, traditional TBM construction methods cannot effectively suppress soil deformation, resulting in insufficient construction quality and safety. This is especially problematic when constructing tunnels within highway subgrades, as it has a significant impact, long construction period, high cost, and severe environmental impact.

Method used

Drilling is carried out using an advanced drilling rig, and a mixture of water glass solution and cement slurry is injected into the borehole through an advanced grouting pipe. This is followed by a backward two-component grouting process. The pressure of the slurry chamber is monitored to control the movement of the drill rod and the tunnel boring machine, forming a semi-circular sealed shell to reinforce the soil above and in front of the tunnel boring machine cutterhead.

Benefits of technology

It significantly improved the stability of the strata above the shield cutterhead, shortened the construction period, saved costs, reduced construction risks, improved construction efficiency and settlement control accuracy, and ensured the safe passage of the shield.

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Abstract

The invention relates to the technical field of tunnel engineering construction, and provides an in-hole advanced grouting construction method for a large shield to penetrate through a highway roadbed in a long distance, which comprises the following steps of: installing an advanced drilling machine on a shield tunneling machine, and rotating the advanced drilling machine to a specified drilling position; a drill rod of the advanced drilling machine is communicated with the shield advanced grouting pipe in a sealed mode; drilling is conducted through a drill rod of an advanced drilling machine, and when the drill hole reaches the preset depth, first mixed liquid is injected into the drill hole through the grouting pipe and the drill rod; after drilling is completed, retreating type double-slurry grouting is conducted through a grouting pipe, and in the grouting process, the pressure of a slurry bin of the shield tunneling machine is continuously monitored, and an advanced drilling machine drill rod and / or the shield tunneling machine are / is controlled to act till grouting is completed; and after grouting is completed, hole sealing is conducted through second mixed liquid. The water permeability of the stratum can be effectively reduced, a closed shell is formed on the inner wall of the tunnel, and the overall stability of the shield cutterhead side stratum is remarkably improved.
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