Cribbing
AssigneeCommercial Shearing, Inc.
InventorNicholas Chlumecky
Life of this patent
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Abstract
A crib member for forming underground cribbing is provided in the form of a concrete circle containing fibre reenforcing and preferably in the form of a donut shaped member. A plurality of such members is stacked one on top of another to form a cylindrical cribbing.
Claims13
A crib member for use in superimposed layers as cribbing in an underground cavity such as a mine comprising a circular concrete member of small substantially uniform thickness relative to its diameter whereby each said member can be rolled into position on its outer periphery and stacked with full surface contact between successive members free of edge loading between member and the bottom member can be rotated about its axis to level an uneven base surface, said member being formed of fibre reenforced concrete whereby brittle failure is prevented.
Dependencies are inferred from the claim text.