Development Of Dynamic Monitoring System For Foundation Scour Of Mountain

Highway bridge foundation scour monitoring has always been one of the key tasks of the highway operation and custody department,especially the maintenance of mountain road bridges,which have many inconveniences and unexpected problems.In particular,when the rainy season is coming and the flash floods are not detected in time,the dangerous bridges cannot be identified in the first time,so that they are still in normal working condition,which may cause the bridge to be damaged and collapsed.,resulting in serious accidents,resulting in loss of personnel and property.In order to speed up the informationization construction of highway custody,promote the process of informationization,improve the safety and prevention network,improve the management level of highway authorities,and reduce accidents in mountainous areas.Continuous monitoring of the base flushing monitor at the bridge site and additional remote monitoring technology to grasp the operational status of the mountain highway bridge foundation in real time to meet the dynamic management requirements and rapid response requirements.This project develops bridge foundation flushing monitoring equipment for the characteristics of river water level and water flow change in mountain rivers.main tasks as follows:(1)Review the hydrological data,calculate the partial scouring of the bridge by formulas 65-1 and 65-2,and use the Fluent software to set the“liquid-solid”two-phase flow parameters of the water flow and sediment to simulate the scouring process;(2)Through the actual installation operation and program comparison,the initial mechanical detection device has many problems in installation,debugging,measurement,etc.In order to make the device more concise,the measurement is more convenient,fast and accurate,and finally the laser is determined.Ranging completes the detection of the flushing situation.(3)In order to solve the problem of power shortage in remote areas,a photovoltaic power generation device with power storage function was designed to ensure the system to work 24 hours a day,and to extend the system standby time;short distance and low speed were realized by ZigBee self-organizing network module.Power consumption,low-rate data transmission,and then the processed data is sent to the upper management machine through the GPRS module for monitoring.(4)Prototype installation test,through the field test to complete the dynamic monitoring of the matrix flushing situation,data processing,automatic positioning and threshold alarm and other functions.After comparison,the deviation between the system test result and the manual measurement result is within 10 mm,and the monitoring of the flushing is accurately completed,and the dynamic monitoring of the bridge flushing in the mountain area is realized.