Common orifice device and construction method for drilling holes using the MJS and freezing methods in connecting channels

By using a connecting channel and sharing the orifice device between the MJS method and the freezing method, the mutual interference problem between the drilling construction of the MJS method and the freezing method was solved, safe and reliable tunnel construction was achieved, the risk of tunnel segment damage and water gushing was reduced, and the ground reinforcement effect was improved.

CN119777892BActive Publication Date: 2025-10-03BEIJING CHINA COAL MINE ENG CO LTD
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Patent Information

Application Number
CN202411786777.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-10-03
Estimated Expiration
2044-12-06

AI Technical Summary

Technical Problem

In ultra-large diameter shield tunnel projects, the drilling construction methods of the MJS method and the freezing method interfere with each other, resulting in damage to the tunnel segments and insufficient ground reinforcement, posing safety risks such as water and sand gushing.

Method used

The connecting channel MJS method and the freezing method share the orifice device. Through the combined use of MJS construction orifice pipe and freezing construction orifice pipe, the number of holes opened in the tunnel segments is reduced, and freezing construction is carried out on the basis of the cement reinforcement layer to ensure the smooth handover of the frozen wall.

Benefits of technology

It effectively reduces damage to tunnel segments, lowers the risk of water gushing, and improves the safety of ground reinforcement and the reliability of construction.

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Abstract

The present invention discloses a common orifice device and construction method for drilling holes using the MJS construction method and the freezing construction method for a connecting channel. The common orifice device for drilling holes using the MJS construction method and the freezing construction method for a connecting channel includes an MJS construction orifice pipe, the first end of which is inserted into a tunnel segment and fixedly connected to the tunnel segment, and the inner diameter of the MJS construction orifice pipe matches the diameter of the MJS drill rod; a flange is fixedly connected to the second end of the MJS construction orifice pipe, and the flange on the second end of the MJS construction orifice pipe is detachably fixedly connected to a guard plate via bolts, and the freezing construction orifice pipe is fixedly connected to the guard plate. The first end of the freezing construction orifice pipe is coaxially inserted into the MJS construction orifice pipe, and the inner diameter of the freezing construction orifice pipe matches the diameter of the freezing drill rod. By installing the guard plate and the freezing construction orifice pipe on the MJS construction orifice pipe, the MJS construction method drilling hole position is utilized when drilling the freezing hole, which can effectively reduce the number of holes opened in the tunnel segment.
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