北京地铁6号线一期花园桥站暗挖段城市地铁隧道下穿既有桥梁时,在穿越前采用数值模拟计算估算桥梁基础变形,进而推算梁体次应力,判断梁体安全状态,据此调整地铁隧道施工方法以及对桥梁的加固措施.在地铁隧道穿越桥梁过程中,通过PLC桥梁同步升降系统主动、动态调整桥梁梁体形状,使梁体基本保持原设计状态,保证了既有桥梁结构安全.%In Beijing Subway Line 6 Phase I, the underground -excavated urban subway tunnel of Huayuanqiao Station passes through an existing bridge. Before excavation, deformation of bridge foundation is estimated through numerical simulation and calculation, and then secondary stress of the bridge is calculated to judge the safety condition of bridge. Thereafter, subway tunnel construction method and bridge reinforcement measures are adjusted. When subway tunnel passes through bridge foundation, bridge shape is actively and dynamically adjusted by using a PLC bridge synchronous lifting system, to basically keep the original design state of the bridge and to guarantee the structural safety of existing bridge.
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