下穿城市公园超浅埋隧道管幕暗挖施工技术——以四海街下穿隧道项目为例  

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

作　　者：李亚 罗利 陈奕帆 LI Ya;LUO Li;CHEN Yifan(China MCC5 Group Corp.Ltd.,Chengdu 610063,China)

机构地区：[1]中国五冶集团有限公司,成都610063

出　　处：《科技和产业》2024年第23期225-229,共5页Science Technology and Industry

基　　金：中国中冶重大研发项目(中冶科技〔2023〕5号-5);四川省住房城乡建设领域科技创新研究课题(SCJSKJ2021-43)。

摘　　要：基于南充四海街项目华新路下穿隧道施工案例,研究管幕暗挖技术的工艺原理和关键技术点,包括管幕的超前注浆、管幕钻机激光制导、管幕锁扣插销限位及导管注浆的关键工艺流程。提出施工过程中的质量控制标准及地表沉降和拱顶沉降的监测方案。通过工程实际得到初期支护拱顶位置最大沉降值为7.7 mm,上部公园地坪沉降最大值为5.1 mm。该施工技术能有效控制施工期间隧道质量和安全,也对隧道主体结构的稳定性起着至关重要的作用。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 

分 类 号：U455.47[建筑科学—桥梁与隧道工程]