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 that 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 at least 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.
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 1 wherein the first and second rows of dowels extend along the ribs and are seated in horizontally aligned holes drilled into the ribs.
4. The mine ventilation seal of claim 1 wherein the dowels in the first and second rows are offset longitudinally of the passageway.
5. The mine ventilation seal of claim 1 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 1 wherein the horizontal rebar members are positioned inboard of the vertical rebar members in the first and second metal mats.
8. The mine ventilation seal of claim 1 wherein some of the vertical and horizontal rebar members are spliced together with wire ties or mechanically coupled with couplers.
9. The mine ventilation seal of claim 1 wherein the steel dowels in the first and second rows are grouted into the holes such that the pull strength on the dowels is substantially equal to the tensile yield strength of the dowels.
10. The mine ventilation seal of claim 1 wherein a water drain or an air sampling tube is provided in the seal.