The invention provides an underground diaphragm wall joint
pipe pulling time
monitoring system and method, and the method comprises the steps: arranging a joint
pipe and a reinforcement cage before the pouring of an underground diaphragm wall, and arranging the underground diaphragm wall joint
pipe pulling time
monitoring system based on an
optical fiber sensing technology on the joint pipe. The underground diaphragm wall joint pipe pulling time
monitoring system comprises an
optical fiber sensor for monitoring the temperature and strain of concrete on the outer side of a joint pipe, and the
optical fiber sensor achieves synchronous measurement of temperature and sound
waves based on a Brillouin-Rayleigh mixed framework and comprises a BOFDA optical
fiber and a DAS optical
fiber; and the DAS optical
fiber is wound by taking the BOFDA optical fiber as an axis. The method has the advantages of high real-time performance and high precision. The distributed
optical fiber sensing technology is adopted, temperature and strain changes in the concrete solidification process can be continuously monitored in real time, temperature and sound
waves are synchronously obtained through
single measurement, equipment does not need to be switched, and compared with a traditional
empirical formula method, the method has higher precision and reliability.