MECHANICAL VENTILATION PIPE CAPABLE OF ADJUSTING DIRECTION OF PIPE OPENING, AND USE METHOD THEREOF

A mechanical ventilation pipe capable of adjusting the direction of a pipe opening, and a use method thereof. The ventilation pipe comprises jet fans (27) mounted at intervals in a tunnel, a longitudinal steel gas pipe (1) is mounted at the top of the tunnel in the tunnel direction, ventilation pipes are connected at intervals on the longitudinal steel gas pipe (1) in areas near the jet fans (27), and the ventilation pipe is provided with an adjustment device which can achieve connecting, disconnecting, displacing, or a combination thereof with or from a gas outlet of each jet fan (27). The ventilation pipe fully utilizes the spare space at the crown of a tunnel, and advantageously changes the flowing path of a gas flow by adjusting mechanical ventilation pipes to be connected to tunnel fans on the basis of existing fans in the tunnel, so as to convert longitudinal ventilation of jet fans in a normal operation state into semi-transverse ventilation under the conditions of tunnel fire, greatly increasing the s