Research On Key Technology Of Inclination Sensor In Deformation Monitoring Of Cable-stayed Bridge Tower

At present,with the continuous development of economy,the phenomenon of bridge overload is more common.As an important part of cable-stayed bridge,the cable-stayed bridge tower of the cable-stayed bridge withstands various external loads,and a large deformation may occur.Its structural condition is directly related to the safety of the cable-stayed bridge.Displacement of the top of the cable-stayed bridge tower is the most intuitive evaluation index,and the structural condition of the bridge can be known to a large extent by measuring its variation.Therefore,deformation monitoring of cable-stayed bridge tower is very important.Compared with other measurement methods,the inclination method has more advantages in measuring the deformation of the tower.In this dissertation,the method of monitoring the deformation of the cable-stayed bridge tower using the inclination method is proposed.The key technology applied to the dynamic deformation measurement of this method is researched and analyzed.The main research and work content of this article includes the following aspects:(1)The importance of deformation monitoring of cable-stayed bridge tower and its deformation monitoring methods are introduced.The structural form of cable-stayed bridge tower and the main methods of its deformation measurement are briefly introduced.The inclination method is applied to the deformation monitoring of cable-stayed bridge tower and its advantages and disadvantages compared with traditional methods are introduced.It also introduces the research status of inclination method deformation measurement.(2)Introduce the method of measuring deflection by the inclination method.Including the principle of the inclination method for deformation measurement,the two key problems of the method for measuring dynamic deflection and the processing methods of these two key problems.And introduces the collection mechanism,hardware parameters,topology structure and communication method determined based on the consideration of the two key issues of the method.(3)Demonstration test of deformation measurement by inclination method.First,the process and results of the static and dynamic tests of the tilt method in a laboratory environment are introduced,so as to preliminarily verify the measurement effectiveness of the method in an environment with relatively little external interference.Then further conduct a real bridge test to verify its feasibility and practical application effectiveness in actual structural deformation measurement in a relatively complex environment.(4)Analysis of sensor layout scheme for measuring the deformation of cable-stayed bridge tower by inclination method.First,the precision analysis method of the deformation measurement by the inclination method is introduced,including the calculation error of the curve segmentation and the evaluation method of the measurement uncertainty.Then,based on the accuracy analysis method,five typical deformation conditions of cable-stayed bridge tower deformation are selected,and the layout scheme of several inclination sensors in each deformation condition is analyzed,so as to determine the layout scheme of sensors that meets the requirements of engineering accuracy and is more economical.(5)The on-site implementation and measurement result analysis of the inclination method tower deformation monitoring system.According to the sensor arrangement plan determined above,the sensor is installed on the cable-stayed bridge tower.First introduce the technical parameters,system structure,communication method and measuring conditions of the deformation monitoring system,and then compare the results of the pylon deformation measurement of the inclination method and the traditional total station method to verify the analysis conclusions of the aforementioned key methods.And verify the actual effect of the sensor layout scheme analysis method and the inclination method applied to the monitoring of the tower deformation.In this dissertation,by researching the key technology of inclination sensor in the deformation monitoring of cable-stayed bridge tower,it provides a new monitoring method reference for the same type of project,which has certain engineering significance.