城市地铁盾构通过暗挖隧道施工案例

以西安地铁盾构通过地裂缝暗挖段区间为实例，通过对“先通过”方案及“后通过”方案之过站小车、弧形导台加钢板、弧形导台加钢轨3种方法综合对比，最终选择了“后通过”方案之弧形导台加轨道法。并重点介绍通过狭小已施作二次结构的暗挖隧道时，盾构接收控制、空推步进、二次始发施工技术与控制要点，以期对类似工程起到借鉴作用。

Case Study on Shield Advancing through Mined Tunnel Section of Urban Metro Work

Regarding the construction of the mined tunnel sections in Xihn Metro, comparison and contrast are made on the option of ＂shield boring before the mined tunnel section is constructed＂ and the option of ＂the mined tunnel is constructed before shield advancing＂ （including shield advancing by transfer car, shield advancing by arc-shaped cradle with steel plate and shield advancing by arc-shaped cradle with steel rail）. Finally, the option of shield advancing by arcshaped cradle with steel rail is adopted. The technology and control points of shield arrival control, non-excavation shield advancing and secondary launching are presented. This paper can be served as reference for similar projects in the future.