Modular bridge extensible device

The utility model belongs to the technical field of bridge extensible devices and discloses a modular bridge extensible device. The modular bridge extensible device is mainly characterized by comprising middle beams, side beams, supporting beams, a displacement box and rubber sealing strips; a pressure bearing support and a compressing support are arranged between the end portion of the supporting beams and the displacement box respectively; every middle beam and every supporting beam are corresponding to each other and are fixed together; a horizontal plate is arranged between the adjacent supporting beams; a displacement control spring is arranged between the adjacent horizontal plates; the displacement is controlled by the plurality of groups of displacement control springs which are mainly used for bearing the unidirectional pressure or tension force. According to the modular bridge extensible device, the stress is simple, the motion is reliable, the slit width control is uniform during free extension and