大直径土压平衡盾构穿越下穿市政隧道的研究

Research on the Large-Diameter Earth-Pressure-Balanced Shield Under the Crossing of the Municipal Tunnel

随着各地盾构施工的日益发展,越来越多的盾构线路需要穿越既有市政建筑。其中,桥梁、既有隧道、河流及机场等关键位置的安全穿越尤为重要。论文以成都轨道交通18号线火—孵—锦盾构区间施工为背景,针对下穿既有下穿市政隧道这一重要节点的施工技术进行讨论研究,为盾构隧道穿越重点市政项目的施工提供参考依据。

With the development of shield construction in various places,more and more shield lines need to cross the existing municipal buildings.Among them,the safe crossing of bridges,existing tunnels,rivers and airports is particularly important.This paper takes the construction of railway station—incubation garden—Jincheng square shield section of Chengdu rail transit line 18 as the background,discusses and studies the construction technology of the important node of the existing underpassmunicipal tunnel,and provides the reference basis for the construction of the shield tunnel through the keymunicipal project.