管棚工艺在近距离穿越运营线路的案例分析

Case Analysis of Pipe Shed in Crossing the Operating Lines at Short Distance

盾构隧道近距离下穿既有运营盾构隧道是地铁施工中的重点与难点。杭州地铁2号线中河北路站-凤起路站区间下穿已运营的地铁1号线区间隧道,为了确保1号线的运营安全,考虑采用打设管棚的方式对拟建隧道拱顶形成加固隔离,充分发挥管棚空间效应,并结合施工控制与自动化监测手段,顺利完成穿越,为类似工程提供借鉴。

It is important and difficult for shield tunnel to under-cross the operating one at short distance during metro construction.The section between North Zhonghe Road Station-Fengqi Road Station of Hangzhou Metro Line 2 passes through the operating section tunnel of Metro Line 1.In order to ensure the operational safety of Metro Line 1,the proposed tunnel are considered to be reinforced and isolated by setting pipe sheds whose spatial effect have been given fully play.Combined with construction control and automatic monitoring,the crossing is successfully completed.The case provides reference for similar projects.