地下4层盖挖逆作地铁车站设计要点研究

介绍盖挖逆作车站的做法以及地下四层盖挖逆作车站结构设计需重点研究的抗浮、侧墙顶拉弯应力控制、钢管柱受力控制、钢管柱施工误差控制、中间桩与边桩差异沉降控制等5个关键问题，并结合合肥轨道交通1号线大东门站地下4层盖挖逆作车站设计实例进行研究，得出采用板墙隼槽连接、AM桩、HPE液压垂直插入钢管柱工法等措施可以很好解决上述5个问题，相关研究结果可供类似工程参考。

Study on key points of four layers underground Top-down excavation method subway station design

Introduces the process of Top-down excavation method station and six important questions for four layers underground Top-down excavation method station structure design needs to solve. Combined with the structure design of Hefei Rail transit Line 1 Dadongmen station, a four layers underground station construct by Top-down excavation method, put forward the wall mortise connection way, AM pile, HPE hydraulic vertical insertion steel pipe column method, Welding beam main reinforcement on the annular plate of steel pipe column, side wall inclined downward construction joint and so on, to solve the above six questions. The solutions put forward in this paper can reference for similar projects.