Bridge expansion device for bridge construction

The utility model discloses a bridge expansion device for bridge construction, which comprises a bridge body mechanism, the bridge body mechanism comprises a plurality of bridge pier supporting columns, the top ends of the plurality of bridge pier supporting columns are fixedly connected with bridge pier bases, and the upper surfaces of the plurality of bridge pier bases are fixedly connected with two connecting pieces. The connecting structure has the advantages that the square telescopic piece can abut against the upper surface of the transverse plate at the other end all the time by arranging the spring, when the bridge body expands with heat and contracts with cold, the square telescopic piece abuts against the upper surface of the transverse plate at the other end all the time, large gaps are not reserved, and stone foreign matter is prevented from being clamped in the connecting structure; the square telescopic piece with the flexibility has small capacity of supporting vehicles to pass through, so that