浅埋暗挖大跨盾构接收井横通道临时支撑拆除技术

北京地铁6号线二期起点至物资学院站区间盾构接收井横通道开挖跨度15.6m,采用双侧壁导坑法施工,二衬施工时,临时中隔墙支撑拆除安全风险很大。本工程采用保留部分临时工字钢支撑,在对其进行有效的防水处理的基础上进行二衬施工,减少了隧道变形和对周边环境的影响,确保隧道上方管线安全,取得了良好的效果,同时也提供了一套适用于复杂环境下地铁暗挖大断面隧道二衬施工技术。

Shallow Buried Excavation Large Span Shield ReceivingWell cross PassageTechnology of the Dismantling Temporary Support

The second stage beginning to materials institute of Beijing metro line 6 line station shield receives well cross-channel excavation span of 15.6m, using double side heading method construction and secondary lining construction of temporary wall support in dismantling, the security risk is very large. This project uses to keep some temporary I-strut, to effective water repellent treatment on the basis of secondary lining construction of tunnel deformation and the impact on the surrounding environment has been reduced, ensuring pipeline safety above the tunnel, and achieved good results, but also provides a set of applicable metro excavation under complex environment construction technique of second lining of tunnel with large cross section.