Telescopic device of rail transit bridge

The invention belongs to the technical field of telescopic devices of bridges, and in particular discloses a telescopic device of a rail transit bridge. According to the main technical scheme, the telescopic device comprises a slag blocking steel plate, profile steel and a fixed waterproof rubber strip, wherein the profile steel has an angle steel structure and is symmetrically cast in a beam body or bridge abutment prefabricated piece, the beam body or bridge abutment prefabricated piece has an unfilled corner structure, one end of each piece of profile steel protrudes an unfilled corner of the beam body or bridge abutment prefabricated piece, and two sides of the waterproof rubber strip are respectively clamped with the protruding ends of the profile steel. The telescopic device of the rail transit bridge has the advantages of good dustproof and waterproof effect, simplicity in construction and installation and convenience in replacement.