Cable bolt
AssigneeQuantax PTY LTD
InventorWarwick Bernard Hutchins
Life of this patent
Estimating the term…
Abstract
A cable bolt (10) for use in mining excavations comprising a plurality of generally closely spaced wires or strands (11) which have a first end for fitting into a bore hole (21) formed in an excavation and a second end which is terminated within a cylindrical sleeve (17). The sleeve (17) has a threaded external surface for receiving a lock nut (18) which is tightened against a bearing plate (19) so as to tension the cable bolt (10). The wires or strands (11) are separated outwardly from a central longitudinal axis of the cable bolt (10) at spaced locations along the length of the cable bolt to form a “bird cage” (13) at each location. Spacers (14) are provided at each location to cause the outward separation of the wires or strands (11). A central tubular member (12) extends along the axis through the sleeve (17) and each spacer (14).
Claims28
A cable bolt comprising a plurality of generally closely spaced elongate wires or strands, said wires or strands having a first end adapted for fitting into a bore hole and a second end being terminated within a cylindrical sleeve, said cylindrical sleeve having a threaded external surface to receive a lock nut for tightening against a bearing plate so as to tension said cable bolt, wherein the termination of said second end of wires or strands comprises a transverse plate in said cylindrical sleeve, said transverse plate having individual termination holes for each of said wires or strands and wherein said wires or strands pass through respective individual termination holes and said each wire or strand has an integral enlarged head which is larger than the diameter of said respective termination holes whereby said each wire or strand cannot be withdrawn from said respective individual termination holes.
A cable bolt comprising a plurality of generally closely spaced elongate wires or strands, said wires or strands having a first end adapted for fitting into a bore hole and a second end being terminated within a cylindrical sleeve, said cylindrical sleeve having a threaded external surface to receive a lock nut for tightening against a bearing plate so as to tension said cable bolt, wherein the termination of said second end of wires of strands comprises a transverse plate in said cylindrical sleeve, said transverse plate having individual termination holes for each of said wires or strands and wherein said wires or strands pass through respective individual termaination holes and said each wire or strand has an integral enlarged head which is larger than the diameter of said respective termination holes, and coupling means adapted to fit a lower end of said cylindrical sleeve for the purpose of rotating said cable bolt, said coupling means including an external portion which is threaded and adapted to engage an internal thread of said cylindrical sleeve such that upon such engagement and rotation of said coupling means a position of said coupling means is reached where further rotation results in rotation of said cable bolt, wherein said coupling means has a connection for receiving a grout tube, said coupling means connection providing access to an annular cavity formed within said coupling means and surrounding a hollow central tubular member.
A cable bolt comprising a plurality of generally closely spaced elongate wires or strands, said wires or strands having a first end adapted for fitting into a bore hole and a second end being terminated within a cylindrical sleeve, said cylindrical sleeve having a threaded external surface to receive a lock nut for tightening against a bearing plate so as to tension said cable bolt, and coupling means adapted to fit a lower end of said cylindrical sleeve for the purpose of rotating said cable bolt, wherein said coupling means has an external portion which is threaded and adapted to engage an internal thread of said cylindrical sleeve such that upon such engagement and rotation of said coupling means a position of said coupling means is reached where further rotation results in rotation of said cable bolt, wherein said coupling means has a connection to a grout tube and connecting said grout tube to said hollow central tubular member such that grout is pumped through said grout tube and enters a hollow central tubular member.
A cable bolt for use in an excavation comprising a plurality of generally closely spaced elongate wires or strands having a first end adapted for fitting into a bore hole formed in said excavation and a second end adapted for bearing against the excavation surface wherein the terminal region of said second end of said wires or strands terminates in a cylindrical sleeve having a threaded external surface adapted to co-operate with a threaded lock nut for tightening said cable bolt against said excavation surface, and wherein the termination of said second end of wires or strands comprises a transverse plate in said cylindrical sleeve, said transverse plate having individual termination holes for each wire or strand and wherein said wires or strands pass through respective individual termination holes and each wire or strand has an integral enlarged head which is larger than the diameter of said respective termination holes whereby said each wire or strand cannot be withdrawn from said respective individual termination holes.
Dependencies are inferred from the claim text.