Construction Monitoring Of A Cable-stayed Bridge With Three Towers And Single Cable Plane

Since the birth of the cable stayed bridge,it has been widely favored by designers for its characteristics of large span,beautiful appearance and strong combination of structures.In recent years,more and more cable-stayed bridges have been built in China,but the structure of the cable-stayed bridge is complicated,and there are many factors in the construction.The actual state of the bridge is very difficult to achieve the ideal state of the design.This requires construction control for cable-stayed bridges,especially for special structure cable-stayed bridges.The construction control of cable-stayed bridge has become a hot research topic for bridge workers.Cable-stayed bridge is a kind of high statically indeterminate structure composed of cable tower,main beam and cable-stayed cable.It is not only large and beautiful,but also the combination of cable-stayed bridges is very flexible.Along with China's large-scale infrastructure construction has opened the curtain,more and more cable stayed bridges appear in engineering applications.The cable-stayed bridge pylons,towers and beams are generally arranged in a single plane,and there are not many pylon and beam in space layout.In addition,the tower is used less in our country,especially the manufacturing processing of profiled steel tower.Therefore,the construction of the three tower and column space frame type cable-stayed bridge is very difficult and high risk.It is necessary to strengthen the construction monitoring of the construction process so as to ensure the smooth progress of the construction process.In view of the construction control of the cable-stayed bridge in this paper,the adaptive construction control method is adopted.The concrete method is to establish the simulation model of the cable-stayed bridge first through the design drawings,and then derive various theoretical data from the model.The sensor is embedded in the construction site to measure the actual stress,and the measured value is compared with the theoretical value,so as to determine whether the structure is safe.When the measured value is very different from the theoretical value,it is necessary to adjust the model,and reinput the actual structure and material parameters to the model,so that the calculation is repeated until the two are consistent,so that the next construction phase can be accurately predicted.The construction unit is built according to the instructions issued by the construction control unit,and keeps moving towards the predetermined goal,and finally achieves our goal.In this paper,the theoretical values of the stress,pre arch degree,cable force and the deflection of the bridge tower are derived by modeling and analysis.Then the stress,line shape,cable force,pylon bias and vertical deformation of the cable-stayed bridge are monitored in real time,and the theoretical values are compared with the measured values,and the final stress is within a reasonable safety range.The error of line smoothing,cable force,deviation of tower and vertical deformation is within the allowable range,and all monitoring reaches the expected goal.