Cable bolt

Abstract

A cable bolt for anchoring, by a curable product, in a hole formed in strata, the cable bolt has a drive head that defines a face end of the cable bolt that, when the cable bolt is inserted into the hole, is to protrude from the hole; an end termination that defines a toe end of the cable bolt at the opposing end to the face end; a first coupling member, and a second coupling member that is configured to be coupled to the first coupling member. The cable bolt further has a first segment that includes the drive head and the first coupling member, and a first set of wire strands that are each secured at one end to the drive head and at the opposing end to the first coupling member; and a second segment that includes the second coupling member and the end termination, and a second set of wire strands that are each secured at one end to the second coupling member and at the opposing end are bound by, and/or secured together at, the end termination. In use, the first and second coupling members are coupled together such that tensile loads in the cable bolt are transferred through the coupled first and second coupling members.

1 . A cable bolt for anchoring, by a curable product, in a hole formed in strata, the cable bolt including:
 a drive head that defines a face end of the cable bolt that, when the cable bolt is inserted into the hole, is to protrude from the hole;   an end termination that defines a toe end of the cable bolt at the opposing end to the face end;   a first coupling member, and a second coupling member that is configured to be coupled to the first coupling member;   a first segment that includes the drive head and the first coupling member, and a first set of wire strands that are each secured at one end to the drive head and at the opposing end to the first coupling member; and   a second segment that includes the second coupling member and the end termination, and a second set of wire strands that are each secured at one end to the second coupling member and at the opposing end are bound by, and/or secured together at, the end termination,   whereby, in use, the first and second coupling members are coupled together such that tensile loads in the cable bolt are transferred through the coupled first and second coupling members.   
     
     
         2 . A cable bolt for anchoring, by a curable product, in a hole formed in strata, the cable bolt including:
 a drive head that defines a face end of the cable bolt that, when the cable bolt is inserted into the hole, is to protrude from the hole;   an end termination that defines a toe end of the cable bolt at the opposing end to the face end;   a plurality of first coupling members, and a plurality of second coupling members that are each configured to be coupled to one of the first coupling members;   a first segment that includes the drive head and one of the first coupling members, and a first set of wire strands that are each secured at one end to the drive head and at the opposing end to the respective first coupling member;   a second segment that includes one of the second coupling members and the end termination, and a second set of wire strands that are each secured at one end to the respective second coupling member and at the opposing end are bound by, and/or secured together at, the end termination; and   at least one intermediate segment that includes one of the first coupling members and one of the second coupling members, and an additional set of wire strands that are each secured at one end to the respective first coupling member and at the opposing end to the respective second coupling member,   whereby, in use, the first and second coupling members are coupled together with the or each intermediate segment being connected within the cable bolt between the first and second segments, such that tensile loads in the cable bolt are transferred through the coupled first and second coupling members.   
     
     
         3 . A cable bolt according to  claim 1 , wherein the first segment includes a central elongate tube defining a throughway through which to pass the curable product, wherein the central elongate tube is secured to the drive head and the respective first coupling member, and wherein the wire strands in the first set of wire strands extend along the central elongate tube. 
     
     
         4 . A cable bolt according to  claim 3 , wherein the wire strands extend spiroidally around the central elongate tube of the first segment. 
     
     
         5 . A cable bolt according to  claim 2 , wherein the or each intermediate segment includes a central elongate tube defining a throughway through which to pass the curable product, wherein the central elongate tube is secured to the respective first and second coupling members, and wherein the wire strands in the respective additional set of wire strands extend along the respective central tube. 
     
     
         6 . A cable bolt according to  claim 5 , wherein the respective additional set of wire strands extend spiroidally around the respective central elongate tube of the respective intermediate segment. 
     
     
         7 . A cable bolt according to  claim 1 , wherein the second segment includes a central elongate tube defining a throughway through which to pass the curable product, wherein the central elongate tube is secured to the respective second coupling member and to the end termination, and wherein the wire strands in the respective additional set of wire strands extend along the respective central elongate tube. 
     
     
         8 . A cable bolt according to  claim 7 , wherein the wire strands extend spiroidally around the central elongate tube of the second segment. 
     
     
         9 . A cable bolt according to  claim 7 , wherein the end termination further includes an end plug that closes the central elongate tube of the second segment at the toe end. 
     
     
         10 . A cable bolt according to  claim 3 , wherein one or more of the segments has a port formed in the wall of the respective central elongate tube, through which curable product can be discharged. 
     
     
         11 . A cable bolt according to  claim 1 , wherein the drive head includes engagement surfaces that a tool can engage to rotate the cable bolt. 
     
     
         12 . A cable bolt according to  claim 11 , wherein the drive head includes a nut that provides the engagement surfaces. 
     
     
         13 . A cable bolt according to  claim 12 , wherein the drive head further includes a cylindrical body, and the plurality of threaded holes are formed at one end of the body, and the body further has an external thread that complements an internal thread on the nut. 
     
     
         14 . A cable bolt according to  claim 1 , wherein the wire strands in the first set has an externally threaded portion, and the drive head has a plurality of internally threaded holes, each threaded hole receiving a respective one of the threaded portions of the wire strands. 
     
     
         15 . A cable bolt according to  claim 3 , wherein the cylindrical body of the drive head includes a connector throughway that mates with the central elongate tube of the first segment such that curable product can be passed through the connector throughway and into the throughway in the central elongate tube. 
     
     
         16 . A cable bolt according to  claim 1 , wherein the first coupling member has a first coupling threaded portion that engages with a complementary second coupling threaded portion provided on the second coupling member to couple the first and second coupling members. 
     
     
         17 . A cable bolt according to  claim 1 , wherein one of the first and second coupling members includes a seal to prevent curable product discharging from the interface between the coupled first and second coupling members. 
     
     
         18 . A cable bolt according to  claim 1 , wherein one of the second and first coupling members includes a projection that is received within a complementary shaped recess in the other of the first and second coupling members. 
     
     
         19 . A cable bolt according to  claim 18 , wherein the projection includes an annular groove within which an O-ring is seated. 
     
     
         20 . A cable bolt according to  claim 1 , wherein the first coupling member includes a cylindrical body with a plurality of apertures that each receive one of the wire strands of the respective segment, and each wire strand having an end formation that resists removal of the wire strand from the respective aperture. 
     
     
         21 . A cable bolt according to  claim 20 , wherein the end formation is an enlarged head. 
     
     
         22 . A cable bolt according to  claim 1 , wherein the first and second coupling members have complementary internal and external threads for coupling the first and second coupling members. 
     
     
         23 . A cable bolt according to  claim 1 , wherein each of the wire strands in the second set has an externally threaded end portion, and the second coupling member of the second segment has a plurality of internally threaded holes, and wherein each threaded hole receives a respective one of the threaded portions of the wire strands of the second set. 
     
     
         24 . A cable bolt according to  claim 2 , wherein in each intermediate segment, each of the wire strands in the additional set has an externally threaded end portion, and the second coupling member of the respective intermediate segment has a plurality of internally threaded holes, and wherein each threaded hole receives a respective one of the threaded portions of the wire strands of the respective additional set. 
     
     
         25 . A cable bolt according to  claim 1 , wherein any one or more of the segments includes a bulb or birdcage formation formed in the respective set of wire strands. 
     
     
         26 . A cable bolt according to  claim 1 , wherein the wire strands have an outer surface that is plain, and/or is shaped to enhance engagement with the curable product. 
     
     
         27 . A cable bolt according to  claim 3 , wherein the central elongate tube of the first segment includes a restrictor that is spaced from the drive head such that a static mixing device can be inserted into the central elongate tube, and the restrictor blocks the static mixing device from further travel along the cable bolt. 
     
     
         28 . A method of installing a cable bolt in a hole formed in strata, the method involving:
 providing a cable bolt according to  claim 1 ;   assembling the cable bolt by coupling the first and second coupling members; and   inserting the cable bolt into the hole, involving first inserting the second segment.   
     
     
         29 . A method according to  claim 28 , wherein the assembling and inserting steps occur simultaneously.