Research On The Incremental Launching Technology Of Prestressed Concrete Continuous Curved Girder Bridges

Prestressed concrete continuous curved girder bridge is widely used currently.There are many construction methods,in which,incremental launching technology of spending short time and guaranteeing the quality is applying on the bridge of striding across high-speed lines or water protection area.This paper is based on the bridge incremental launching constrcution of a two span continuous curved girder bridge,studying the following contents:(1)This thesis reviews the development of incremental launching technology application,and summarizes the results of predecessors on incremental launching technology research(2)This thesis analyzes the deformation and force of the key section in the incremental launching,and makes comparison of the calculation results of analytic method and finite element method.The analytical method is applicable to summarize the force rule of girder and the finite element method is suitable to get accurate results.(3)This thesis analyzes the effect of design parameters of guide beam on the stress of the main beam and the combining site of the guide beam and main beam.And it also analyzes the overall and local stress rule of the guide beam in the process of incremental launching.(4)This thesis proposes the control methods of the horizontal force and vertical force of the supporting system,and analyzes force transmission relations between the pushing device and the supporting system.(5)This thesis proposes the monitoring system of the incremental launching of the plane curved girder construction and curved incremental launching linear control methods.The above contents can provide guidance and assistance for pushing construction of similar curved bridge structures.