The Engineering Design And Realization Of State Parameters Monitoring System For Dafosi Yangtse River Bridge

With the continuous automation and intelligentization of bridge safety monitoring, the conventional detection method cannot satisfy the request of long-term monitoring, therefore, the monitoring systems with automated, long-term, real-time and remote monitoring functions play an increasing important role. The safety status of Dafosi Yangtse River bridge, one of the top ten oversized bridge in our country, gets the broad intention of engineering and academic, correspondingly, the safety monitoring of Dafosi bridge is very significant.Based on the significance of safety monitoring, a key program of western transportation scientific and technological named "Study on the safety monitoring system of Dafosi Yangtse River Bridge" has been initiated by Ministry of Communications. The program involves three parts of overall project design, system study and evaluation method study, and, the engineering design and realization in system study is an important component in the whole program. The creative program involves a new realization method in the engineering design and realization. In order to carry out the engineering design and realization, and combine the system and bridge structure an integer, the study on the involved technology and method must be fulfilled.The engineering design and evaluation is not of theoretical, but the practice and method, technology study is emphasized. It is the bottleneck of system engineering realization. And, it hasn't been think much of in the bridge monitoring. Accordingly, it is necessary to study the engineering design and realization for automation monitoring system, which is satisfied with the Dafosi Yangtse River Bridge.This thesis firstly introduces the significance of the health monitoring of bridge structures, sequentially, the significance of the status monitoring of Dafosi Yangtse River Bridge is discussed. Moreover, the essentiality of engineering design and realization in the monitoring system is analyzed. Based on the analysis, the research content of this thesis is proposed.The specialties of bridge construction, hardware system distribution and the system properties have been analyzed for the foundation of system engineering design. System property analysis has been implemented of three types of sensors, including fiber optic strain, optoelectronic deflection, digital temperature sensor, and the hardware devices involved with field monitoring room. The principles of the sensors are mainly discussed.The embedding technology study of fiber optic strain sensor has been probed, and the emphasis is the modified packed embedding technology. The engineering design and realization has been carried out for the fiber optic strain, optoelectronic deflection, digital temperature sensors, and the field monitoring room used in the bridge status parameters monitoring. The details are the field construction technology of sensors embedding/installation, wiring/piping, leads of fiber optic strain sensors and the fiber optic.To verify the validation and rationality of system engineering design and realization, the field running examination has been done. The results show that the embedded sensors in the structure can obtain data precisely and reliably. The survivability of sensors is coincided with the design. It has been showed that the engineering design and the realization method are reasonable and reliable.