After nearly 16 years of operation of a cable-stayed bridge,the large-tonnage vertical bearings of the main bridge have experienced extrusion and serious wear of the PTFE sliding plate.In order to prevent the bearing disease from affecting the structure of the cable-stayed bridge,the main The 8 large-tonnage bearings of the bridge were replaced with basin bearings with higher wear resistance.The simulation modeling and analysis of the bearing replacement design is carried out,and the control parameters for bearing replacement-jacking displacement and jacking force are proposed.PLC multi-point synchronous jacking equipment is used to replace the bridge bearing.The displacement is monitored in real time during the whole process.Engineering practice has proved that the replacement technology has been implemented well.Before and after the replacement of the bearing,the structural displacement and stress measured results and change trends are in line with the theoretical change law,and they are all controlled within the safety index.Large tonnage supports provide useful reference.
cable-stayed bridgebearing replacementmonitoring and control
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