Steel anchored reinforced mine seal
View Patent ↗A reinforced mine ventilation seal anchored with steel dowels into the strata of a mine passageway. The seal has a pair of metal mats formed of vertical and horizontal elongated reinforcing members which are sandwiched between a row of dowels set into the floor and ceiling of the passageway and extending into the passageway. The metal mats and the dowels are encased in a structural material such as concrete to form a seal which is capable of bidirectionally withstanding an overpressure due to an explosion. The dowels provide shear reinforcement and the metal mats provide flexural strength.
1. A reinforced mine ventilation seal for a passageway in a mine, said seal capable of bidirectionally withstanding overpressures from 50 to 120 psi comprising,
a metal structure having first and second metal mats of vertical and horizontal elongated reinforcing members extending transversely of the passageway between the ribs and heightwise of the passageway between the floor and ceiling, said metal mats spaced apart longitudinally of the passageway in vertical parallel relationship with the horizontal members positioned inboard of the vertical members, and first and second rows of spaced apart steel dowels seated in holes drilled into the floor and the ceiling of the passageway and extending into the passageway a distance that overlaps one or more of the horizontal members in said metal mats, said first row of dowels outboard of the horizontal bars in the first metal mat and said second row of dowels outboard of the horizontal bars in the second metal mat; and,
a filling of structural material embedding the metal mats and the dowels,
whereby said dowels provide bidirectional shear reinforcement bracing the seal against lateral movement in the passageway and said metal mats provide flexural strength.
2. The mine ventilation seal of claim 1 wherein the first and second rows of dowels are laced together by stirrups.
3. The mine ventilation seal of claim 2 wherein the first and second rows of dowels extend along the ribs.
4. The mine ventilation seal of claim 1 wherein the dowels in the ceiling are vertically aligned with the dowels in the floor and the dowels in the first and second rows are offset longitudinally of the passageway and laced together with stirrups.
5. The mine ventilation seal of claim 4 wherein a first and second row of 3-D panel sections with an insulated core removed are sandwiched between the first and second metal mats.
6. The mine ventilation seal of claim 1 wherein the metal structure is embedded in the filling material to a depth of several inches on an inby and outby side of the seal.
7. The mine ventilation seal of claim 6 wherein the filling material is gunned or poured onto the metal structure.
8. The mine ventilation seal of claim 7 wherein the filling material is gunned and confined by a wall on the inby side of the seal.
9. The mine ventilation seal of claim 8 wherein the filing material is poured and confined by a form on the inby and outby side of the seal.
10. A reinforced mine ventilation seal for a passageway in a mine, said seal capable of bidirectionally withstanding overpressures from 50 to 120 psi comprising,
a metal structure having first and second metal mats of vertical and horizontal rebar members extending transversely of the passageway between the ribs and heightwise of the passageway between the floor and ceiling, said metal mats spaced apart longitudinally of the passageway in vertical parallel relationship with the horizontal rebar members positioned inboard of the vertical rebar members, a first and second row of 3-D panel sections with an insulated core removed are sandwiched between the first and second metal mats and first and second rows of spaced apart steel rebar dowels seated in holes drilled into the floor and the ceiling of the passageway and extending into the passageway a distance that overlaps one or more of the horizontal rebar members in said metal mats, said first row of rebar dowels outboard of the horizontal rebar members in the first metal mat and said second row of rebar dowels outboard of the horizontal rebar members in the second metal mat; and,
a filling of structural material embedding the metal mats, 3-D panels and the rebar dowels,
whereby said dowels provide bidirectional shear reinforcement bracing the seal against lateral movement in the passageway and said metal mats and 3-D panels provide flexural strength.
11. The mine ventilation seal of claim 10 wherein the rebar dowels in the ceiling are vertically aligned with the rebar dowels in the floor and the rebar dowels in the first and second rows are offset longitudinally of the passageway and laced together with stirrups.
12. The mine ventilation seal of claim 11 wherein the vertical rebar members are attached to the rebar dowels in the floor and ceiling where they are in alignment.
13. The mine ventilation seal of claim 12 wherein the filling material is confined by a wall constructed on the inby side of the seal.
14. The mine ventilation seal of claim 13 wherein the filling material is applied as gunite or shotcrete.
15. The mine ventilation seal of claim 14 wherein the gunite or shotcrete is applied with a viscosity and velocity such that it flows around and encapsulates the metal structure.
16. The mine ventilation seal of claim 15 wherein the gunite or shotcrete has a depth of at least 2 inches over the dowels on the inby and outby side of the seal.
17. The mine seal of claim 16 wherein the vertical rebar members are #9 rebar, grade 60, and the horizontal rebar members are #5 rebar, grade 60, and the seal is capable of directionally withstanding an overpressure of at least 120 psi.
18. The mine seal of claim 16 wherein the vertical rebar members are #7 rebar, grade 60, and the horizontal rebar members are #5 rebar, grade 60, and the seal is capable of bidirectionally withstanding an overpressure of at least 50 psi.
19. A reinforced mine ventilation seal for a passageway in a mine, said seal capable of bidirectionally withstanding overpressures from 50 to 120 psi comprising,
a metal structure having first and second metal mats of vertical and horizontal elongated reinforcing members extending transversely of the passageway between the ribs and heightwise of the passageway between the floor and ceiling, said metal mats spaced apart longitudinally of the passageway in vertical parallel relationship with the horizontal members positioned inboard of the vertical members, and first and second rows of spaced apart steel dowels seated in holes drilled into the floor and the ceiling of the passageway and extending into the passageway a distance that overlaps one or more of the horizontal members in said metal mats, said first row of dowels outboard of the horizontal bars in the first metal mat and coupled to aligned vertical bars in the first metal mat and said second row of dowels outboard of the horizontal bars in the second metal mat and coupled to aligned vertical bars in the second metal mat; and,
a filling of structural material embedding the metal mats and the dowels,
whereby said dowels provide bidirectional shear reinforcement bracing the seal against lateral movement in the passageway and said metal mats provide flexural strength.
20. The mine ventilation structure of claim 19 wherein the dowels in the ceiling are vertically aligned with the dowels in the floor and the dowels in the first and second rows are offset longitudinally of the passageway.
21. The mine ventilation structure of claim 1 wherein the filling is sprayed-in and the dowels are seated in the holes drilled into the floor and the ceiling and grouted into the floor and the ceiling such that the pull strength on the dowels is equal to the full tensile yield strength of the dowels.
22. The mine ventilation structure of claim 10 wherein the filling is sprayed-in and the rebar dowels are seated in the holes drilled into the floor and the ceiling and grouted into the floor and the ceiling such that the pull strength on the dowels is equal to the full tensile yield strength of the dowels.
23. The mine ventilation structure of claim 19 wherein the filling is sprayed-in and the dowels are seated in the holes drilled into the floor and the ceiling and grouted into the floor and the ceiling such that the pull strength on the dowels is equal to the full tensile yield strength of the dowels.
24. A reinforced mine ventilation seal for a passageway in a mine, said seal capable of bidirectionally withstanding overpressures from 50 to 120 psi comprising,
a metal structure having first and second metal mats of vertical and horizontal rebar members extending transversely of the passageway between the ribs and heightwise of the passageway between the floor and ceiling, said metal mats spaced apart longitudinally of the passageway in vertical parallel relationship, and first and second rows of spaced apart steel dowels seated in vertically aligned holes drilled into the floor and the ceiling of the passageway and extending into the passageway, said first and second rows of spaced apart steel dowels respectively coupled to the vertical members in the first and second mats forming a sandwich; and,
a filling of structural material embedding the metal mats and the dowels,
whereby said dowels provide bidirectional shear reinforcement bracing the seal against lateral movement in the passageway and said metal mats provide flexural strength.
25. The mine ventilation seal of claim 24 wherein the first and second rows of dowels are laced together by stirrups.
26. The mine ventilation seal of claim 25 wherein the first and second rows of dowels extend along the ribs.
27. The mine ventilation seal of claim 24 wherein the dowels in the first and second rows are offset longitudinally of the passageway.
28. The mine ventilation seal of claim 27 wherein a first and second row of 3-D panel sections with an insulated core removed are sandwiched between the first and second metal mats.
29. The mine ventilation seal of claim 24 wherein the metal structure is embedded in the filling material to a depth of several inches on an inby and outby side of the seal.
30. The mine ventilation seal of claim 24 wherein the horizontal rebar members are positioned inboard of the vertical rebar members in the first and second metal mats.