Seamless bridge expansion device

A seamless bridge expansion and contraction device comprises supporting blocks, expansion and contraction components and spring pull rods, the supporting blocks are arranged in a mounting notch in the end of a first beam and a mounting notch in the end of a second beam and arranged in the transverse bridge direction, the expansion and contraction components are arranged on the supporting blocks and arranged at intervals in the transverse bridge direction, and the outer ends of the expansion and contraction components are fixed to the beam ends on the corresponding sides; the spring pull rods are arranged on the supporting blocks and distributed at intervals in the transverse bridge direction, the two ends of each spring pull rod are fixed to the first beam end and the second beam end respectively, and elastic filling layers are poured in the mounting notches and cover the supporting blocks, the telescopic components and the spring railings. According to the seamless bridge expansion device, the supporting blo