地铁车站明挖深基坑近接既有建筑物基础的预应力锚索施工技术

Construction Technology of Prestressed Cable for Open⁃cut Deep Foundation Excavation of Subway Station Adjacent to Existing Building Foundation

结合成都地铁6号线金府站明挖深基坑紧邻既有机电城和交大路下穿金府路隧道的工程特点,介绍了地铁车站明挖深基坑内采用预应力锚索加固既有机电城一侧地层的施工方法,给出了在基坑内采用竖向双层锚索纵向逐段加固砂卵石地层的方法,总结了明挖深基坑紧邻既有建筑物基础的预应力锚索加固地层施工技术要点,并提出了控制锚索施工质量的技术措施。

In combination with the engineering features of open⁃cut foundation excavation of Jinfu subway station adjacent to existing buildings on Chengdu Metro Line 6,both the construction method and process of prestressed cable to reinforce the sandy pebble strata in the open⁃cut deep foundation excavation are elaborated.The method of reinforcing the sandy pebble strata with both two layer prestressed cables in vertical direction and piecewise along axial direction of the foundation excavation is proposed.The technical bullet points of installing prestressed cable in the deep foundation excavation to reinforce the sandy pebble strata underneath the expanded foundation of the existing buildings are also summarized,and the technical measures employed to enhance the construction quality of prestressed cable are proposed as well in this paper.