Study On Curved-pylon And Curved-girder Cable-stayed Bridge Without Back-stays Construction Monitoring And Control

Bridge construction monitoring is an important measure to guarantee the quality of the bridge construction,through the bridge construction monitoring can get internal force and deformation of the structure during the construction stage and understand the actual status of the structure,and each process can be controlled within the target range to ensure the bridge construction smoothly.Based on the project background of Dongguan waterway bridge,this paper studied construction monitoring and control technology of curved-pylon and curvedgirder cable-stayed bridge without back-stays,followed each construction process and applied construction monitoring and control technology to ensure the bridge construction smoothly.(1)It described the characteristics of Dongguan waterway bridge,including the overall layout,concrete girder bridge design,steel girder design,steel-concrete composite segment design,pylon-girder segment design and construction schedule arrangement.(2)Analyzed the key technology of curved-pylon and curved-girder cable-stayed bridge without back-stays from the manufacturing and installation of steel box girder,manufacture and installation of pylon steel shell,steel-concrete composite segment construction,etc.and summarized construction control points of curved-pylon and curved-girder cable-stayed bridge without back-stays.(3)It described construction monitoring and control method of curved-pylon and curvedgirder cable-stayed bridge without back-stays,determined the main content of the construction monitoring and control and made implementation plan.(4)It adopted the finite element software Midas/Civil to establish the bridge construction stage analysis model,and calculated the stress and deformation state of the bridge structure during each stage of construction process;It adopted finite element software Midas/Fea to analyze hydration heat of the steel-concrete composite segment and the pylon 1# segment,and the reasonable construction suggestions were given based on the results of hydration heat analysis.(5)Based on measured stress,elevation and cable-Force data,analyzed the bridge state and verified structural design method.