Abstract: Wireless adhoc network is used in the monitoring of the steel support stress so as to guarantee the construction safety and quality of steel support of deep foundation pits of Metro stations. The components and working principles of adhoc network system are presented. The key points of axial force of steel support are monitored by means of WSN coordinator, WSN router, WSN data acquiring device and stress sensor. The advantages and disadvantages of wireless adhoc network in monitoring of steel support stress are presented. Due to the application of the wireless adhoc network, timely information feedback can be achieved, the labors’ working intensity can be reduced and the loss of the stability of the support system induced by overrunning of the axial force of the support can be avoided.

Key words: Metro station, deep foundation pit, steel support stress, wireless adhoc network, monitoring system