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北京地铁5号线崇文门站为国内首次在既有地铁隧道下方采用暗挖法施工的地铁车站,施工期间要保证既有地铁线路的正常运营,因此施工难度和风险极大。施工前对既有地铁结构进行了安全评估,根据评估结果并结合相关规范制定了既有线结构变形的安全控制标准。在施工风险分析的基础上,结合数值模拟计算确定了柱洞法施工方案,并辅以降水、超前大管幕和注浆等辅助技术措施,同时采用远程自动监测系统实时监控既有线的动态变化,对施工中既有线结构出现的异常变形进行了及时处理,最终地铁车站成功建成,并确保了既有地铁结构的安全和线路的正常运营。
Beijing Chongwenmen Subway Station Line 5 is the first metro station built by underground excavation method in China under the existing subway tunnel. During the construction period, it is necessary to ensure the normal operation of the existing subway lines. Therefore, the construction difficulty and risk are extremely great. Before the construction of the existing subway structure of a safety assessment, according to the assessment results and in conjunction with relevant norms to develop the existing line structural deformation of the safety control standards. Based on the analysis of construction risk, combined with numerical simulation and calculation, the construction method of column-hole method is determined and supplemented with auxiliary measures such as precipitation, advanced big-pipe curtain and grouting, etc. Meanwhile, the remote automatic monitoring system is used to monitor the dynamic changes of existing lines in real time , The construction of the existing line structure of the abnormal deformation occurred in a timely manner, the final successful completion of the subway station, and to ensure the safety of existing subway structures and the normal operation of the line.