The Construction Control Analysis Of The Continuous Rigid-frame Bridge Of Thin-walled High Pier

Since the new century,with the traffic infrastructure construction investment of the country gradually increased and the rapid development of bridge construction technology,China's construction of high pier large span bridges refreshes the world bridge list in the height,span and length.The continuous rigid frame bridge creatively combines the advantages of the continuous girder bridge and the T-shaped rigid frame system bridge,and it has been developing rapidly.Not only does it retain the characteristics of continuous beam bridge running smoothly,but also inherits the development of the T-shaped frame system bridge without the need of setting the bearing,without the need of system conversion,while the various longitudinal deformation of the load can be balanced by the pier effectively improve the bridge of the force situation.With the increase of bridge pier height and span,the problem of construction control is becoming more and more important in the design and construction of thin-walled high pier.Compared with the increase of the flexibility of the solid pier and the influence of the unbalanced load and the natural wind and temperature be concerned.In this paper,the construction technology of continuous rigid frame bridge construction is studied by using the bridge monitoring project of Hunan Province highway Heilong bridge as the engineering case.1.The history and present situation of the monitoring technology of large span bridge are described,and the theoretical methods and practical application of construction control techniques are expounded.2.Use the method of least squares to adjust parameter of the simulation theory model,which can let the parameter value be closer to the actual.Collect data of construction structure in the process of deformation and main section stress data,and the theory of algorithms is expounded.3.Use the grey system theory to forecast the next stage data combined with the Heilong bridge project,control the bridge alignment based on the measured data and theoretical model.Compared with the theoretical value and the measured values and predicted values,results show that the effect is more ideal.4.Heilong bridge has characteristics such as curved bridge,high piers and large span continuous rigid structure,which lead to high temperature sensitivity.Temperature load has great influence on the continuous girder bridge cantilever construction,temperature strain and stress on the pier and girder and internal force influence.Choose a relatively small temperature when the sub-stress is relatively small in the final closure is discussed in this chapter.Finally,this paper summarizes and prospects the research content for the follow-up study.