Based on the engineering background of the jacking construction of two-connected three-span continuous beam,the jack-ing construction is carried out by using PLC computer synchronous control system.The model is established by midas Civil finite ele-ment software,and the whole process of bridge construction and jacking process are simulated and calculated.On the premise of ensu-ring the safety of the beam body,the control value of uneven displacement difference of jacking is calculated and analyzed.The deform-ation,stress,foundation settlement,cracks and other monitoring measures are taken for the bridge during the jacking process,and the corresponding monitoring and early warning values are formulated to provide theoretical and technical guidance for the subsequent bridge jacking reconstruction.
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