Abstract:

In order to guarantee the operation safety of the metro above during the construction of Chongwenmen station in Beijing metro No.5, the remote monitoring system is used to measure the dynamic changes of existing metro structure. The monitoring system is composed of sensor subsystem, data acquisition and transmission subsystem, and data management subsystem, which can reduce the interaction between the monitoring and subway operation in maximum. The sensor subsystem consists of static force level gauge, beam inclinometer, displacement sensor and joint meter, which are used to monitor the settlements of existing tunnel and track bed, transverse height difference and horizontal space between two running rails and changes of the structure slots respectively. The data acquisition and transmission subsystem can transfer the collected data to the information center by wired medium. The data received will be treated by the management subsystem; and then fed back to related departments and companies by public network. The deformations of the existing metro structure are monitored effectively by the system during the undercrossing construction of newly-built metro station; and the control measures are adjusted in time according to the deformation data so as to make the existing metro runs safely.

Key words: metro station construction, existing metro tunnel, safe operation, remote monitoring system, real-time automatic monitoring