The Implement And Analysis Of Construction Control In Xiaoqinghe River Continuous Rigid Frame Bridge

With the rapid development of modern transportation industry, many projects of high-speed rail and expressway emerge in order to travel conveniently and save time for people. But these projects will inevitably encounter some rivers and complex terrain which need to be crossed, and a large number of special bridges will be constructed. The continuous rigid frame bridge is very popular because of its high strength, good overall mechanical performance, rapid construction and good seismic performance. The hanging basket cantilever construction has many advantages such as the lighter weight, the convenient for moving forward and installing, the smaller deformation and so on, which is widely used in the continuous rigid frame bridge. But there are many affecting factors and uncertainties in the cantilever construction of continuous rigid frame bridge, and the construction condition is very complex, so it is very easy to make the finished bridge state deviates from the state of theory design. In conclusion, the implementation of construction control in bridge is very necessary.First of all, this paper describes the development history, construction characteristics, construction method and developing trend of the continuous rigid frame bridge, and comprehensively introduces the development, meaning, content and corresponding affecting factors of the in continuous rigid frame bridge. And the introduction of structure calculation method laid the theoretical basis for the engineering application of construction control in continuous rigid frame bridge.Based on the project of Xiaoqinghe continuous rigid frame bridge, this paper then introduces the specific application of construction control in Xiaoqinghe continuous rigid frame bridge for the purpose of studying the elevation control and the monitoring of stress and temperature. By using the design and analysis software MIDAS/Civil, the finite element model is established, which provides the reliable theory data for the bridge construction control before the construction.In this paper, after analyzing the affecting factors such as construction condition, model parameter, deformation of the hanging basket and considering the combined influence of the nonlinear factors and the complex environment in the construction, the proceeding analysis method is used and the error correcting is introduced so that the elevation deviation could be controlled in a reasonable range. And the monitoring of bridge internal stress is implemented timely to ensure the construction safety.Finally, by comparing the actual measured results with the theoretical design value of the Xiaoqinghe continuous rigid frame bridge, it shows that the computing model of the MIDAS/Civil software is accurate; the results of the elevation control is good by using the proceeding analysis method; the internal stresses of the bridge meet the corresponding requirements. That is to say, the construction control of the whole bridge is successful and the results have reference value for other bridge constructions.