Bridge jacking method

The invention discloses a bridge jacking method. The method comprises the following steps of: arranging a reaction foundation and a jacking bracket below an upper structure of the bridge; arranging a plurality of hydraulic jacks lined with temporary pads between the reaction foundation and the upper structure of the bridge; jacking the upper structure of the bridge to the preset position by utilizing the hydraulic jacks; supporting the upper structure of the bridge by the jacking bracket in the jacking process; and carrying out synchronous jacking by the hydraulic jacks under the control of a PLC hydraulic synchronous jacking control system. In the method, the PLC hydraulic synchronous jacking control system is utilized to perform jacking control on the hydraulic jacks, and the defect that the hydraulic jacks can not perform nsynchronous jacking is fundamentally overcome, thereby the displacement and gestures of the bridge can be accurately controlled, the bridge is ensured to have good synchronous jacking, and the jacking safety of the upper structure is ensured.