倒挂井壁法在联络通道施工中的应用

Application of the inverted side-wall method in connection passage construction

地铁联络通道施工多在隧道洞通后采用暗挖和冷冻法施工,北京地铁7号线东延高楼金站~施园站区间(高施区间)受盾构始发端加站变更影响,工期严重滞后。区间联络通道采用冷冻法施工已无法保证通车目标,经四方会议进行多方案比选后,选择了可以先期施工的明挖倒挂井壁法施工。倒挂井壁法施工可在区间盾构未开始施工前施工,提前完成联络通道结构主体,相比原方案(冻结法),倒挂井壁法施工改变了联络通道施工顺序,变控制节点工作为非关键工作,并且节省了施工成本,有效解决了地铁区间联络通道节点滞后、施工工艺后置的施工难题。本施工方法丰富了地铁联络通道施工方法,可供今后类似工程参考和借鉴。

The underground excavation and freezing method are often used in the construction of subway connecting passage after the tunnel is opened.The construction period of the East extension of Beijing Metro Line 7 from Gao lou jin station to Shi yuan station(high to shi section)is seriously delayed due to the influence of the change of station addition at shield starting point.The freezing method can’t guarantee the goal of opening to traffic for the interstation connecting passage.After the multi scheme comparison and selection by the quartet meeting,the open cut and inverted hanging shaft wall method which can be constructed in advance is selected.The construction of inverted hanging shaft wall method can be carried out before the construction of interval shield,and the main structure of connecting channel can be completed in advance.Compared with the original scheme(freezing method),inverted hanging shaft wall method changes the construction sequence of connecting channel,changes the control node work into non key work,saves the construction cost,and effectively solves the construction difficulties of node lag and post construction process of connecting channel in subway interval question.This construction method enriches the construction method of subway connecting passage and can be used as reference in similar projects in the future.