A method for constructing connecting shaft passages during the tunnel lining construction stage

By using rotary drilling to form a vertical shaft and hoisting support steel pipes during the lining construction of long-distance water conveyance tunnels, the problem of increasing the working face was solved, and the construction of the connecting shaft passage was achieved quickly, at low cost, and with high safety.

CN117823161BActive Publication Date: 2026-06-30YSD RAIL TRANSIT CONSTR CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YSD RAIL TRANSIT CONSTR CO LTD
Filing Date
2023-12-12
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Increasing the number of working faces during the construction of the lining of long-distance water conveyance tunnels is difficult, and existing methods suffer from high costs, long construction periods, and low safety.

Method used

A vertical shaft is formed using rotary drilling, and support steel pipes are hoisted into the shaft for support. It is connected to the tunnel through a horizontal connecting channel. Combined with mud wall protection and concrete bottom sealing, the connecting shaft channel can be quickly set up.

Benefits of technology

This technology enables the rapid installation of connecting shafts during the lining construction of deep-buried, long-distance water conveyance tunnels, reducing costs, shortening the construction period, and improving safety.

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Abstract

A method for constructing connecting shaft passages during the tunnel lining construction stage includes the following steps: A vertical shaft is formed using rotary drilling and mud slurry wall support, with a depth greater than the tunnel bottom; support steel pipes are hoisted into the shaft, and the bottom of the support steel pipes is sealed with concrete; the gap between the support steel pipes and the shaft is grouted and backfilled; a horizontal connecting passage is constructed, connecting the tunnel to the support steel pipes in the shaft; the lining structure is constructed inside the tunnel, requiring openings at the portal of the horizontal connecting passage; after the lining structure is completed, the openings, the horizontal connecting passage, and the shaft are sealed. This method enables the rapid establishment of connecting shaft passages to increase the working face during the lining construction stage of deep-buried long-distance water conveyance tunnels, and features low cost, short construction period, and high safety.
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Citation Information

Patent Citations

  • Large-section vertical shaft pre-grouting reinforcement quick excavation method

    CN104453915A

  • Large-buried-depth tunnel top vertical shaft backfilling load-reducing structure and construction method thereof

    CN112627885A