Variable yielding mining crib support column
AssigneeMountainland Support, Inc.
InventorChris D. Kitchen
Life of this patent
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Abstract
A roof support column used as a support between the roof and floor of a mine comprises a stacked series of hollow roof support cribs containing a mixture of light-weight aggregate such as volcanic lava, tuft or pumice, and a chemical foam contained in one chamber of a triple-walled high density paper tubing. The other chamber has honeycomb material therein. The combination of these materials results in a roof support crib which has the yielding characteristics of wood. Such cribs called variable yielding cribs are stacked and locked on top of one another to form a vertical cylindrical cribbing support column.
Claims6
A collapsible crib for a mine roof support column, comprising in combination:
- a triple-walled vertical support structure having a hollow center, said triple walls having an outer wall, a center wall and an inner wall in spaced-apart relationship with each other;
- a composite material filling the aperture between the outer and center walls comprising a composite of urethane formable material and rock aggregate;
- a honeycomb material filling the aperture between the inner and center walls;
- an indent along the upper and lower ends of the triple-walled support structure for interlocking respectively the upper end of one support structure with the lower end of another support structure;
- and
- a fiberglass jacket surrounding the outer wall for waterproofing the support structure.
Dependencies are inferred from the claim text.