The Study On Control Technology And Application Of Rectification And Resetting Of The Bridge

High-pier bridge is mostly set when bridge is constructed in the heavy hilly areas,high mountains and deep valleys.Due to the temperature effect and the repeated action of the braking force of the vehicle,large longitudinal slope in the long-run operation process of the simply supported to continuous bridge,often appears pier tilt,Longitudinal shift of the beam Expansion joints failure and the separation of the bridge support phenomenon.The main reason is that during the construction of the bridge,the wedge block at the bottom of the bridge is not correctly set.The beam bottom of the bridge beam is not horizontal after the erection of the beam,resulting in the top surface of the bearing being subjected to the diagonal pressure,therefore,horizontal force appears.Excessive beam slip and pier tilt will affect the stress of the bridge structure and its performance,more seriously it will affect the normal use of the entire bridge structure.This paper,taking a certain bridge on a highway as an example,summarizes the causes of the problems.Combined with the engineering practice on maintenance and strengthening,this paper expounds force frame correction technology on the pier,to provide reference and basis for similar problems on bridge rectification afterwards.Practice of the bridge rectification engineering shows that,the counter force frame installed on the bridge structure,using the pier or the beam counterforce frame as bearing stress point,through the push of the jack of state correction,will reduce influence of the original structure,make construction rectification convenient.Besides,The setting of a limit device after rectification effectively control the disease development.Aiming at the problems of beam slippage and pier tilt,this paper uses space finite element analysis software to establish the spatial model and analyze the relative slip mechanism of the solid element between the pier support and the beam body.Through the division of six corrective working conditions,the influence of such factors as dead load,temperature load,braking force,vertical load and stiffness of piers on the bridge deflection are modeled and calculated.In the case of unidirectional longitudinal slope,the influence of the unbalanced support surface of the bridge on the deviation of the bridge is discussed.The main causes of beam slippage and pillar tilt are analyzed.When misaligned,the bridge has some negative influence on the bearing capacity and structural safety of its superstructure.Bridge structure safety is affected when the slipping of the beam and the tilt of the pillar exceed the specified limits.Therefore,when a bridge disease occurs,rectification and reinforcement should be promptly taken place so that all parts can work normally.When the bridge deviation is serious,it should be corrected immediately to ensure the safety of the overall structure so that the bridge will work properly.This article based on the correction project,by analyzing and calculating through space finite element method,thus obtaining the main causes of disease.Corrective work is carried out in a targeted manner,the stress and strain are simultaneously monitored in real time so as to prevent the occurrence of secondary diseases.It is concluded that by setting the reaction frame on the self-component of the bridge and using the push-pushing device to realize the method of correcting and resetting the bridge components,so that the temporary support piers are reduced or relieved,workload is reduced,cost is reduced,and the efficiency is improved.