Construction Technology for Ultra-shallow Buried Tunnels Using Pipe-roof Curtain Underground Excavation Method Beneath City Park:Taking the Sihai Street Underpass Tunnel Project as an Example
Construction Technology for Ultra-shallow Buried Tunnels Using Pipe-roof Curtain Underground Excavation Method Beneath City Park:Taking the Sihai Street Underpass Tunnel Project as an Example
Based on the construction case of the Huaxin Road underpass tunnel project at Nanchong Sihai Street,the technological principle and key points of the pipe-roof shield excavation technique were studied,including advanced grouting of the pipe-roof,laser guidance for the pipe-roof drilling rig,limit positioning of the pipe-roof lock pin,and the critical process flow for conduit grouting.The quality control standards during the construction process was proposed,and the monitoring plans for surface settlement and vault settlement were introduced.Through practical engineering,it is found that the maximum settlement value at the initial support vault position was 7.7 mm,and the maximum settlement value at the upper park ground was 5.1 mm.The effective control of the construction technology over the tunnel's quality and safety during construction was verified and the construction technology plays a crucial role in the stability of the tunnel's main structure.
关键词
超浅埋隧道/管幕暗挖施工/超前注浆/管幕钻机激光制导/管幕锁扣插销限位及导管注浆/监控量测
Key words
ultra-shallow buried tunnel/pipe roof shield excavation construction/advanced grouting/pipe roof drilling rig laser guidance/pipe roof lock pin position limitation and conduit grouting/monitoring and measurement
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