Abstract: A cable bolt assembly is disclosed comprising a cable bolt having a shaft, an end fitting disposed on the shaft and including an end fitting body. Mechanical interlocking is provided between the body and the shaft to form a connection therebetween. The mechanical interlocking may be formed directly between the body and the shaft and/or by engagement formations disposed intermediate the body and shaft. The body further including an exterior profiling arranged to engage a further component of the end fitting to install and/or tension the cable bolt assembly in use. A method of forming the cable bolt assembly is also disclosed.

Abstract: An end coupling for a rock bolt having a shaft having an external thread, the coupling having an axis and the coupling comprising a body having a leading end and a trailing end spaced apart along the axis, a first passage portion extending along the axis from the leading end; a second passage portion extending along the axis from the trailing end; the first passage portion including a first thread portion to threadingly engage the external thread on the shaft of the rock bolt; the second passage portion including a drive receiving portion arranged to be engaged with a drive inserted into the second passage portion via the trailing end to impart rotation to the coupling about the axis.

Abstract: An end coupling for a rock bolt having a shaft having an external thread, the coupling having an axis and the coupling comprising a body having a leading end and a trailing end spaced apart along the axis, a first passage portion extending along the axis from the leading end; a second passage portion extending along the axis from the trailing end; the first passage portion including a first thread portion to threadingly engage the external thread on the shaft of the rock bolt; the second passage portion including a drive receiving portion arranged to be engaged with a drive inserted into the second passage portion via the trailing end to impart rotation to the coupling about the axis.

Abstract: The present invention relates to a self drilling rock bolt which may be used in mining applications. Self drilling rock bolts are typically formed by rebars having an axially extending central passageway for water passage and post grouting. Costs of such hollow steel rebars is quite high. In the present invention, a rock bolt is formed from a hollow tubular member which may be steel pipe, and a reinforcing arrangement comprising prestressed concrete type steel strand wound around the outside of the hollow tubular member.

Abstract: Disclosed is a rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured such that a protrusion extends outwardly beyond an outer surface of the shaft.

Abstract: A cable bolt (10, 60) comprising a flexible cable (11) formed from a plurality of wound strands, wherein at least one of the strands is a hollow strand (12b). In one form, at least one region (14) of the hollow strand is formed with a helical formation or is otherwise arranged to resist radial compression. A cable bolt (60) is also disclosed with a hollow strand (12b) that has a coupling (65) fitted at one end (14) and a resin retainer (61) fitted on the other end of the hollow strand.

Abstract: An end coupling for a shaft of a rock bolt comprises a body having a lead portion with a leading end, and a tail portion with a trailing end. The tail portion is arranged to be connected to a drive to impart rotation to the coupling about its axis. The body defines a passage extending between the leading and trailing ends and a first portion of the passage extends from the leading end and has a first diameter. A second portion of the passage is disposed adjacent the first portion and has a second diameter that is larger than said first diameter. A first thread extends along at least part of the first portion of the passage and is arranged to engage an external thread on the rock bolt shaft. A rock bolt assembly incorporating the end coupling is also disclosed.

Abstract: The present invention relates to rock bolts which may be used in mining applications. The rock bolt of this invention includes a mechanical anchoring arrangement to facilitate retaining the rock bolt in a borehole, and also a drill bit to enable self drilling of the rock bolt. Rotation of the rock bolt about an axis of the rock bolt in a first direction causes the drill bit to drill into rock and to create a borehole to receive the rock bolt. Subsequently, rotation in the opposite direction actuates a mechanical anchoring arrangement to anchor rock bolt.

Abstract: The present invention relates to rock bolts which may be used in mining applications. The rock bolt of this invention includes a mechanical anchoring arrangement to facilitate retaining the rock bolt in a borehole, and also a drill bit to enable self drilling of the rock bolt. Rotation of the rock bolt about an axis of the rock bolt in a first direction causes the drill bit to drill into rock and to create a borehole to receive the rock bolt. Subsequently, rotation in the opposite direction actuates a mechanical anchoring arrangement to anchor rock bolt.

Abstract: A tensioning assembly 10 for a cable bolt 11 comprises a clamping device (14, 16) adapted for fastening to the bolt and an outer member 18 adapted for interacting with the clamping device. The outer member 18 is able to undergo relative movement to the clamping device in the direction of the bolt's axis, and under such movement, the clamping device is caused to fasten to the bolt. Furthermore, the outer member is adapted for interacting with the bolt 11 whereby, during such relative movement, twisting of the bolt 11 with respect to the outer member 18 is restrained.

Abstract: An end coupling for a shaft of a rock bolt comprises a body having a lead portion with a leading end, and a tail portion with a trailing end. The tail portion is arranged to be connected to a drive to impart rotation to the coupling about its axis. The body defines a passage extending between the leading and trailing ends and a first portion of the passage extends from the leading end and has a first diameter. A second portion of the passage is disposed adjacent the first portion and has a second diameter that is larger than said first diameter. A first thread extends along at least part of the first portion of the passage and is arranged to engage an external thread on the rock bolt shaft. A rock bolt assembly incorporating the end coupling is also disclosed.

Abstract: A tensioning assembly 10 for a cable bolt having a flexible shaft 12 comprises a clamping device 14, 16 configured to mount to the bolt shaft 12 with an axis (CA) of the clamping device aligned with the shaft axis (SA); and an outer member located over, and engaged with, the clamping device 14, 16. The outer member 18 is arranged, under a predetermined movement of the outer member, to impart drive to the clamping device 14, 16 to bias the clamping device 14, 16 to move in the direction of the clamping device axis. A cable bolt and method of tensioning a cable bolt is also disclosed.

Abstract: An end coupling 1, 19 for a shaft 2 of a rock bolt 50 comprises a body 6 having a lead portion 8 with a leading end 9, and a tail portion 10 with a trailing end 11. The tail portion 10 is arranged to be connected to a drive to impart rotation to the coupling about its axis. The body 6 defines a passage 7 extending between the leading and trailing ends and a first portion 12 of the passage 7 extends from the leading end 9 and has a first diameter. A second portion 15 of the passage 7 is disposed adjacent the first portion 12 and has a second diameter that is larger than said first diameter. A first thread 14 extends along at least part of the first portion 12 of the passage 7 and is arranged to engage an external thread 4 on the rock bolt shaft 2. A rock bolt assembly incorporating the end coupling 1, 19 is also disclosed.

Abstract: An engagement head for a rock bolt tensioning assembly is disclosed that is profiled to include at least one key surface to inhibit rotation of the engagement head relative to a rock surface, either by direct engagement with the rock surface or through abutment with a plate-like member that is engageable with the rock surface.

Abstract: A tensioning assembly 10 for a cable bolt 11 comprises a clamping device (14, 16) adapted for fastening to the bolt and an outer member 18 adapted for interacting with the clamping device. The outer member 18 is able to undergo relative movement to the clamping device in the direction of the bolt's axis, and under such movement, the clamping device is caused to fasten to the bolt. Furthermore, the outer member is adapted for interacting with the bolt 11 whereby, during such relative movement, twisting of the bolt 11 with respect to the outer member 18 is restrained.

Abstract: An end coupling 1, 19 for a shaft 2 of a rock bolt 50 comprises a body 6 having a lead portion 8 with a leading end 9, and a tail portion 10 with a trailing end 11. The tail portion 10 is arranged to be connected to a drive to impart rotation to the coupling about its axis. The body 6 defines a passage 7 extending between the leading and trailing ends and a first portion 12 of the passage 7 extends from the leading end 9 and has a first diameter. A second portion 15 of the passage 7 is disposed adjacent the first portion 12 and has a second diameter that is larger than said first diameter. A first thread 14 extends along at least part of the first portion 12 of the passage 7 and is arranged to engage an external thread 4 on the rock bolt shaft 2. A rock bolt assembly incorporating the end coupling 1, 19 is also disclosed.

Abstract: The present invention relates to a self drilling rock bolt which may be used in mining applications. Self drilling rock bolts are typically are formed by rebars having an axially extending central passageway for water passage and post grouting. Costs of such hollow steel rebars is quite high. In the present invention, a rock bolt is formed from a hollow tubular member which may be steel pipe, and a reinforcing arrangement comprising prestressed concrete type steel strand wound around the outside of the hollow tubular member.

Abstract: A cable bolt (10, 60) comprising a flexible cable 11 formed from a plurality of wound strands, wherein at least one of the strands is a hollow strand 12b. In one form, at least one region 14 of the hollow strand is formed with a helical formation or is otherwise arranged to resist radial compression. A cable bolt 60 is also disclosed with a hollow strand 12b that has a coupling 65 fitted at one end 14 and a resin retainer 61 fitted on the other end of the hollow strand.

Abstract: A tensioning assembly 10 for a cable bolt having a flexible shaft 12 comprises a clamping device 14, 16 configured to mount to the bolt shaft 12 with an axis (CA) of the clamping device aligned with the shaft axis (SA); and an outer member located over, and engaged with, the clamping device 14, 16. The outer member 18 is arranged, under a predetermined movement of the outer member, to impart drive to the clamping device 14, 16 to bias the clamping device 14, 16 to move in the direction of the clamping device axis. A cable bolt and method of tensioning a cable bolt is also disclosed.