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| The Designof Monitoring System for Axial Force of Steel Bracing of Foundation Pit in Subway Construction |
| GAO Yu，FAN Xu - chao，HE Yu，SHI Wei |
| (Xi, an University of Science and Technology，Xi,an，Shaanxi 710054, China) |
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Abstract Research purposes ： Monitoring of axial force of steel bracing of foundation pit in subway construction is very important，which has significance to the secure construction witli pit. At present，it use the frequency meter to detect changes of tlie axial force in the construction site. Its disadvantage is not real - time monitoring，not alarm immediately overrun pressure. At the same time，the traditional reading meter adopts high voltage excitation mode，easy to damage the axial force meter. This paper introduces a kind of axial force detecting system based on low power microcontroller MSP430F149 of TI Company as the control core. The system has the function of real - time monitoring of t!ie axial force to steel bracings. Research conclusion ： Through the system design and the construction scene test， the following conclusions are obtained ： (1) The system can realize vibration to steel string of sensor by the way of low - voltage with frequency，the same effect of by the way of high - voltage wit!i frequency can monitor axial force meter，and can reduce the damage to the sensor. (2 ) Through comparison of the reading results with frequency reading meter， the design can realize the accurate reading of frequency of theaxial force meter，at thesametime，it can monitor theaxial force changes in real time，to improve the effect of foundation construction engineering safety early warning，so as to ensure the safety of foundation pit. (3)The research results can be applied in monitoring of deep foundation pit support.
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Received: 23 November 2015
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2016, Vol. 33 
