小半径曲线盾构过区间中间风井施工技术  

Construction technology of small radius curved section shield through the middle ventilating shaft

作　　者：方亮亮 Fang Liangliang

机构地区：[1]安徽金联地矿科技有限公司,安徽合肥230088

出　　处：《现代城市轨道交通》2023年第10期75-79,共5页Modern Urban Transit

摘　　要：为解决土压平衡盾构机在超深中间风井小曲线半径接收和二次始发中存在的问题,以合肥市轨道交通3号线南延线450 m小弯道青云区间连续掘进穿越中间风井为实例,提出一种新的设计思路和设计方案,通过方案优化,在中间风井段现浇钢筋混凝土弧形导台,采用割线接收和二次始发以及负环管段空顶通过小半径曲线中间风井的方式,实现中间风井安全、快速的盾构穿越施工,可为同类工程项目提供参考。In order to solve the problem of small curvature radius reception and secondary launch of earth pressure balance shield tunneling machine in the ultra deep middle ventilating shaft,taking the Qingyun section of 450 m small bend of the south extension line of Hefei rail transit line 3 as an example,a new design idea and scheme is proposed.According to the optimized scheme,cast-in-place reinforced concrete arc guide in the middle ventilating shaft section,secant reception and secondary origination,by adopting the way that the hollow roof of the negative loop section passes through the small radius curve air shaft,the safe and fast shield tunneling of the air shaft is realized.

关 键 词：地铁隧道施工 小半径曲线 中间风井 弧形导台 割线接收 二次始发 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]