Patent ID: 8967916
Filing Date: 2015-03-03
Classification: E21D

Abstract:
1. A cable bolt apparatus for supporting a mine roof comprising: a mechanical anchor configured to be driven into a closed end of a bore hole in a rock material, the mechanical anchor expandable to fix the cable bolt in place; a flexible multi-stranded cable segment connected at a first end to the mechanical anchor and at a second end to a drive head; a plate disposed adjacent the drive head, the drive head rotatable to apply torque against the plate for tensioning the cable segment in the bore hole; a seal portion disposed around the cable segment within the bore hole; a conduit extending through the plate and into the bore hole for injecting a liquid grout material; the conduit comprising a plurality of discharge holes through a wall of the conduit to provide a path to distribute the liquid grout material that is injected into the bore hole; and at least one mixing element configured to mix the liquid grout material at a point of entry of the conduit; wherein the conduit is disposed adjacent to the flexible multi-stranded cable segment, the conduit and the flexible multi-stranded cable being nonconcentric; and wherein the plurality of discharge holes are distributed along the conduit wall within the bore hole; and wherein the conduit provides a predetermined distribution of the liquid grout material in the bore hole and the seal maintains the liquid grout material within the bore hole while the grout material solidifies and bonds with the rock material.