半逆作法在轨道交通与周边地块同步实施基坑中的应用研究

An Application Research of Half Bottomup Method to Rail Transit and Surrounding Synchronous Foundation Pit Implementation

城市轨道交通建设及周边地下空间开发是一个系统工程。由于施工周期、围护设计方案、开挖深度不同等原因,轨道交通与地下空间往往无法实现一体化实施。少数同步实施的基坑也均采用大开挖式的传统明挖顺作法施工,基坑工程造价较高且对周边环境影响较大。以中国铁建国际城1D地块深基坑工程为例,详细介绍该项目与天津轨道交通6号线民权门站一体化实施,采用"中心岛顺作-周边环板逆作"的半逆作施工方法。该设计方法在节省基坑工程造价和工期的同时,又保护周边环境,具有良好的经济效益和社会效益。

The integration of urbanrail transit construction and surrounding underground space development is a systematic engineering. Due to the differences of construction periods, containment design plans and excavation depths,cannot achieve the integration of implementing. A few simultaneous implementing foundation pits are all adopting the traditional open cut method result in high engineering cost and large impact on the surroundings. Based on the 1D parcel deep foundation pit engineering of CRCC International City, the integration of implementing of the foundation pit and Min Quan Men Station of Tconstruction is adopting half bottom-up method of 'combination of top-down center & bottomup surroundings', which saves the construction cost and period, and moreover, protects the surrounding environment with great economic efficiency and social benefits.