近距离下穿轨道交通高架桥的深基坑设计施工技术

介绍了上海市轨道交通8号线虹口足球场站近距离横穿运营中的轨道交通3号线高架桥的深基坑设计施工技术。采用钻孔咬合桩作为围护结构,根据侧向变形引起的桩基附加力确定基坑变形控制值,结合楼板设置钢筋混凝土支撑的框架逆筑法施工,兼顾了施工进度和环境保护的要求。施工过程的实际变形和理论预测基本吻合。

Design and Construction of Deep Foundation Pit by Mass Transit Viaduct

With an introduction of the design and construction technology used in the deep foundation pit of Hongkou Football Stadium Station of Metro Line 8,which closely traversed the viaduct section of Shanghai Pearl Line,this paper discusses the requirements of the construction schedule and the environment protection,indicates the engineering,in which the bored lock pile was adopted as supporting structure,the frame top-down construction method combining reinforced concrete supporting was applied.Meanwhile,the control value of pit deformation is obtained from the additional force on piles foundation caused by lateral deformation.The authors argue that the real deformation of foundation pit is in good agreement with the theoretic prediction of the construction,and the project under construction is successful.