VENTILATION DEVICE WITH EXTENSIBLE AIR PIPE

PROBLEM TO BE SOLVED: To provide a ventilation device for tunnel with an extensible air pipe that requires less work to change or remove the extensible air pipe and has high work efficiency.SOLUTION: A ventilation device with an extensible air pipe includes: a self-propelled vehicle 10 which is mounted with an air blower 11 and can move in a tunnel; a suction-side air pipe 12A in a hollow annular shape which is coupled to a suction side of the air blower 11, and can extend in a longitudinal direction and has a front end and a rear end opened; and a suction-side suspension device 16A which is attached to the self-propelled vehicle 10, and can extend in a longitudinal direction and suspends the suction-side air pipe 12A movably. The suction-side suspension device 16A includes: a hollow fixed pipe 17a, a plurality of hollow extension pipes 17b capable of extending in a nesting manner in the hollow fixed pipe 17a; a winch 18 winding a wire 18a fixed to a tip of the hollow extension pipes 17b; and a plurality of hangers from which a circular ring 14 of the suction-side air pipe 12A is hung and which can move along the hollow extension pipes 17b. The suction-side air pipe 12A is shortened by using a suction air flow generated by the air blower 11 and winding of the wire 18a in combination.