Bridge elastic restraint device

The invention relates to a bridge elastic restraint device. An elastic constraint system or a damping constraint system has the problems of weak bearing capacity, small rigidity, limited service life, high cost and the like. The bridge elastic restraint device is connected between a bridge tower and a main beam and is longitudinally arranged. The bridge elastic restraint device comprises a cylinder sleeve, a hinge base and a piston rod. The piston rod is inserted into the cylinder sleeve in a matched mode to form a piston cylinder sleeve assembly which is longitudinally arranged. The two ends of the piston cylinder sleeve assembly are connected to the top of a bridge tower cross beam and a main beam bottom plate through hinge bases correspondingly. The device is arranged between the tower and the beam and used for controlling the beam end to generate large longitudinal displacement, tower top and beam end displacement can be effectively limited, meanwhile, tower bottom internal force is greatly reduced, the d