地铁PBA车站大断面倒挂井壁施工工法的应用研究

地铁工程倒挂井壁法多用于隧道区间临时竖井、暗挖车站临时竖井及区间联络通道处,长春地铁1号线一期工程长春火车南广场站车站PBA暗挖段受新建地下三层全盖挖逆作法长春火车站综合交通换乘中心南广场工程、地下一层既有春华商场地下人防改造影响,工期滞后先完成全盖挖逆作法综合换乘中心南广场工程和负四层地铁盖挖段车站结构后,再由车站小里程盖挖段向大里程PBA暗挖段施工的原设计方案已无法保证1号线全线通车节点目标。

Application Research on Construction Method of Large-section Upside-down Shaft Wall in Subway PBA Station

The upside-down shaft wall method in subway projects is mostly used for temporary shafts in tunnel sections,temporary shafts at underground excavation stations and inter-connection passages.The PBA undercut section of Changchun Railway South Square Station,the first-phase project of Changchun Metro Line 1,is affected by the newly built three-story underground.Cover and dig reverse method The South Square Project of Changchun Railway Station Comprehensive Transportation Transfer Center and the underground first floor of Chunhua Shopping Center are already affected by the underground civil air defense renovation.The construction period is delayed to complete the full cover and dig reverse method Comprehensive Transfer Center South Square Project and the minus four-story subway After the station structure is covered and excavated,the original design plan for the construction from the small mileage covered excavation section to the large mileage PBA undercut section can no longer guarantee the goal of opening the entire line of Line 1 to traffic.