Supporting method for bottom beam of smart lifting type highway bridge

The invention belongs to the field of urban bridges and discloses a supporting method for a bottom beam of a smart lifting type highway bridge. The smart lifting type highway bridge comprises a movable foundation base, the bottom beam, a bridge body, a bridge body hydraulic cylinder, a bottom beam hydraulic cylinder and movable base hydraulic cylinders. The bridge body hydraulic cylinder drives the bridge body to ascend or descend, the bottom beam hydraulic cylinder drives the bottom beam to ascend or descend, and the movable base hydraulic cylinders drive the movable foundation base to move from front to back after the bottom beam ascends. According to the invention, when the smart lifting type highway bridge ascends or descends, the road surfaces keep flat constantly, and therefore vehicle passing is convenient.