Underground excavation tunnel limited space large-diameter shield empty pushing construction method

By installing reaction frames and reaction grooves on the tunnel boring machine (TBM), and utilizing the alternating propulsion of the air-thrusting cylinder and the lifting cylinder, combined with the leveling cylinder and flexible support components, the problem of low air-thrusting efficiency of the TBM in confined spaces was solved, and a continuous propulsion process was achieved.

CN121088408APending Publication Date: 2025-12-09CHINA RAILWAY NO 3 GRP CO LTD +1
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Patent Information

Application Number
CN202511249039.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-03
Publication Date
2025-12-09

AI Technical Summary

Technical Problem

When a tunnel boring machine (TBM) starts its operation in a confined space in a mined tunnel, the limited space and friction result in low efficiency of air propulsion and make continuous advancement difficult.

Method used

By adopting a reaction frame and reaction groove structure, and through the alternating propulsion of the air thrust cylinder and the lifting cylinder, combined with the leveling cylinder and flexible support components, the shield machine can achieve continuous dynamic movement, reduce friction and improve propulsion efficiency.

Benefits of technology

This improved the efficiency of tunnel boring machines (TBMs) in confined spaces, avoiding the problem of difficulty in restarting TBMs after they stop, which is common in traditional methods, and enabled uninterrupted propulsion.

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Abstract

The invention relates to the technical field of shield construction, in particular to a bored tunnel limited space large-diameter shield empty pushing construction method which comprises the steps that S1, empty pushing tunnel excavation is conducted on one side of a working well along a tunnel path, and counter-force grooves are reserved in the two sides of a starting guide table and the two sides of an empty pushing guide table; s2, after the shield machine is split and assembled, the crane is debugged; s3, an empty pushing oil cylinder, a counter-force frame and a jacking oil cylinder are installed on the two sides of the shield machine, and the lower end of the jacking oil cylinder is assembled in the sliding rail in a sliding mode; s4, the steel rails on the starting guide table and the empty push guide table are coated with lubricating oil, and an empty push oil cylinder is connected with a hydraulic pump station; s5, an empty pushing oil cylinder is controlled to conduct pushing, after the empty pushing oil cylinder is pushed to a set distance, a jacking oil cylinder is controlled to eject out of the reaction frame, then the empty pushing oil cylinder shrinks, the reaction frame is driven to advance to the position over the next reaction groove, and the jacking oil cylinder shrinks to enable the reaction frame to be inserted into the next reaction groove; a counter-force supporting structure is formed through the counter-force frame and the counter-force groove, so that the shield machine is pushed to advance forwards.
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