Patent ID: 9022689
Filing Date: 2015-05-05
Classification: E21D,E21F

Abstract:
1. A pumpable mine ventilation overcast for segregating the ventilation flow of intersecting mine passageways, and including an elongate overcast tunnel structure with end wing walls secured transversely to opposite ends of said tunnel structure for sealing off the passage of the tunnel structure to surrounding mine passageway faces, the overcast comprising: an elongate overcast tunnel framework; at least one pumpable bag having spaced walls of generally parallel nonporous and flexible sheets, said at least one pumpable bag covering and secured to said tunnel framework and having at least one fill port and at least one exhaust port for filling said bag with a fluid fill for thereby providing said elongate overcast tunnel structure; said end wing walls comprised of vertical bags secured transversely to respective ends of said tunnel framework and having spaced walls of generally parallel nonporous and flexible sheets with at least one fill port and at least one exhaust port for filling said wing wall bags with a fluid fill.