Limiting device

The utility model discloses a limiting device which comprises a first limiting piece, a second limiting piece and a third limiting piece, the first limiting piece comprises an extending part extending in the first direction and limiting parts arranged at the two ends of the extending part, and the limiting parts extend in the second direction; the first limiting piece is connected with the second limiting piece, the second limiting piece comprises at least two limiting columns, the limiting columns extend in the third direction, and the limiting columns are arranged at intervals; the at least two second limiting pieces are connected with the first limiting piece and are arranged in the first direction, the extending parts are arranged between the limiting columns, and the second limiting pieces are arranged between the limiting parts at the two ends of the extending parts. According to the limiting device, the bridge can be limited in the jacking process, and extrusion and collision between different bridge b