VENTILATION METHOD OF RAILWAY TUNNELS FOR MOVEMENT OF DIESEL-POWERED VEHICLES THROUGH THEM Russian patent published in 2012 - IPC E21F1/00 

FIELD: ventilation.

SUBSTANCE: method involves fresh air supply through shafts into tunnel and contaminated air removal through other shafts from tunnel using forced ventilation. Cross section of each shaft is separated into two parts having independent connection to the tunnel in which a gate is installed between such connections. Tunnel is closed by means of the above gate when there are no trains moving in it. Air flow via tunnel is arranged at the interval between train movement in directions allowing to reduce the time required for removal of contaminated air from the tunnel. At that, selection of air flow direction is determined considering the length of sections filled with fresh air supplied to the tunnel as a result of suction effect action. Amount of fresh air supplied to each section filled with contaminated air is determined by the formula.

EFFECT: reduction of forced ventilation volumes at fixed time interval between trains, reduction of time required for tunnel cleaning from contaminants after every train passes through tunnel, and increase in tunnel capacity.

1 dwg