SOUNDPROOFING TUNNEL FOR BRIDGE

A soundproof tunnel for a bridge is provided to release the stress due to the vertical and horizontal abnormal behavior and prevent the tunnel from being deformed and cracked by placing a unit vertically and horizontally shifting the center beam and one side beam of both side beams. A soundproof tunnel for a bridge is composed of a center beam(11) vertically mounted at the center of the upper plate of the bridge; a column(1) integrally formed at both sides of the center beam and formed with side beams(12,12a) whose ends are mounted at the relatively fixed structure such as side or earth parts of the upper plate of the separated bridge; a vertical behavior unit(3) vertically displacing the side beam between the column and one side beam; and a horizontal behavior unit(4) horizontally displacing the side beam between the side beam and the relative structure. The vertical behavior unit has a rotary apparatus(30) rotatably fixing the side beam at the center beam.