Research on Jacking Construction Technology and Deformation Control of River-crossing Steel Box Girder
The main span beam of the east extension of Xuefu Road across Taiping River Bridge is constructed by jacking construction,which has the characteristics of large jacking span,wide beam structure and long time required.Through on-site monitoring,combined with the construction plan,the step displacement,offset and deflection in the jacking process are analyzed.The reasons for the deviation are analyzed as follows:the vertical jacking of the jacking equipment is not in place,the error of the transverse movement of the transverse oil cylinder,the settlement of the temporary pier,the complex and changeable environment of the jacking construction,and the large temperature difference between the morning and evening on the construction site.Therefore,targeted construction control measures are formulated to ensure the safety and stability of each structure during the beam stepping process.
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