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介绍南京地铁南北线一期工程西延线TA25标淤泥质粉质粘土层地层降排水施工方案的选定及实施。重点阐述真空管井的结构型式、施工程序及机具设备。
Describe the selection and implementation of the construction scheme of descending and draining water for TA25 standard silty silty clay layer in the west extension of Nanjing-North Line Phase I Project. Focus on the vacuum tube well structure type, construction procedures and equipment.