Pumpable mine ventilation structure
A pumpable mine ventilation stopping wall structure comprised of a pumpable bag having spaced walls of generally parallel nonporous and flexible sheets with the sheets retained in spaced relationship with spaced flexible cross ties. The perimeter of the spaced walls are closed off with a permeable mesh having a mesh size which will permit restricted flow of cementitious grout therethrough for sealing the wall structure to surrounding rough mine faces. The bag is provided with at least one grout fill port for filling the bag by pumping cementitious grout into the bag.
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.
2. The pumpable mine ventilation overcast of claim 1 , wherein said overcast tunnel framework is a metal frame and said at least one bag covers over and is secured to said frame.
3. The pumpable mine ventilation overcast of claim 2 , wherein said nonporous and flexible sheets are geotextile fabric, plastic or fabric reinforced plastic.
4. The pumpable mine ventilation overcast of claim 2 , including a vertical wing wall frame for each end wing wall, said vertical bags respectively secured to said vertical frames.
5. The pumpable mine ventilation overcast of claim 2 , including channel skids under said overcast framework whereby said framework may be moved on said skids.
6. The pumpable mine ventilation overcast of claim 5 , wherein said at least one bag includes edge flaps positioned under said skids.
7. The pumpable mine ventilation overcast of claim 1 , wherein said spaced walls of said vertical bags are retained in spaced relationship with spaced flexible cross ties.
8. The pumpable mine ventilation overcast of claim 7 , including an internal reinforcement mesh layer between said spaced walls of said vertical bags.
9. The pumpable mine ventilation overcast of claim 7 , wherein the outer perimeter of said spaced walls is closed off with a permeable mesh having a mesh size which will permit restricted flow of a cementitious grout therethrough for sealing said outer perimeter to surrounding mine faces.
10. A method of constructing a mine ventilation overcast for segregating the ventilation of intersecting mine passageways with an elongate overcast tunnel structure having end wing walls secured transversely to opposite ends of said elongate tunnel structure for sealing off the passage of the tunnel structure to surrounding mine passageway faces, comprising:
constructing an overcast elongate tunnel framework;
providing at least one pumpable bag having spaced walls of generally parallel nonporous flexible sheets;
covering said framework with said at least one bag and securing said at least one bag to said framework for thereby providing said elongate overcast tunnel structure;
constructing vertical end wing walls for opposite ends of said tunnel framework by securing vertical bags transversely to opposite ends of said framework said vertical bags constructed of spaced walls of generally parallel nonporous and flexible sheets; and
pumping a fluid fill into all of said bags under pressure through respective fill ports for thereby filling all of said bags with said fill to construct said overcast tunnel structure and to expand perimeter edges of said vertical bags into engagement with surrounding mine passageway faces to thereby construct said mine ventilation overcast.
11. The method of claim 10 , wherein said spaced walls of said wing walls are retained in spaced relationship with spaced flexible cross ties, and the outer perimeter of said spaced walls is closed off with a permeable mesh having a mesh size which permits restricted flow of a cementitious grout therethrough; and selecting said fill as a settable cementitious grout and thereby sealing the outer perimeter of said wing walls with surrounding mine passageway faces.