Abstract: A mine roof bolt includes a flexible multi-strand cable having a first and second end with a drive head formed on the first head, the drive head having a plurality of driving faces on an exterior surface thereof. A load bearing barrel and wedge assembly is attached to the cable, with a separate drive head attached to the cable, wherein the separate drive head is utilized substantially for rotating the cable.

Abstract: A plurality of designs for mine roof bolts is disclosed. Each mine roof bolt includes a flexible multi-strand cable having a first and second end with a drive head formed on the first end, the drive head having a plurality of driving faces on an exterior surface thereof. The drive head may be formed integrally with the multi-strand cable in one embodiment of the present invention. An alternative embodiment of the present invention forms a drive head as a separate member. With a separate drive head, a barrel and wedge assembly may be attached to the cable wherein the drive head is utilized substantially for rotating the cable.

Abstract: The present invention relates to a cable truss system for supporting a mine roof. The system includes at least one cable bolt secured in at least a pair of spaced boreholes. A leading end of each cable bolt is secured within the borehole and the trailing end extending out of the borehole. At least one splice tube is coupled to the trailing end of each cable bolt. Each splice tube includes an elongated conduit between a pair of spaced ends with the conduit adapted to receive at least a pair of cables therethrough. Cable attachments are provided on the trailing end of each cable bolt at a position on the cable bolt such that the splice tube is positioned between the cable attachment and the borehole. The cable attachment has a diameter larger than the inner dimensions of the conduit of the splice tube such that the cable attachment is adapted to abut against one end of the conduit of the splice tube.

Abstract: A pillar cable truss system including a support cable extending between a pair of splice tubes mounted onto a geological formation such as a pillar in a coal mine with a pair of rock anchors. The splice tubes may be attached to two support cables such that sets of the support cables with splice tubes and rock anchors may be connected together to encircle a pillar. A vertically arranged elongated cable spacer tube is mounted onto the pillar with a rock anchor and includes openings through which the support cables extend. The spacer tube retains sets of the support cables apart from each other and/or allows the support cables to be installed in a crisscross pattern.

Abstract: A tensionable mine roof cable bolt having a resin grouted upper portion and a mechanically anchored lower portion. The lower portion includes a shaft which is swaged to the cable and accepts a mechanical anchor. The cable bolt is rotated during installation in a mine roof to mix resin and simultaneously engage the mechanical anchor with the rock. A drivehead attached to the lower end of the cable fails upon tensioning of the bolt to a predetermined load.

Abstract: The present invention relates to a cable truss system for supporting a mine roof. The system includes at least one cable bolt secured in at least a pair of spaced boreholes. A leading end of each cable bolt is secured within the borehole and the trailing end extending out of the borehole. At least one splice tube is coupled to the trailing end of each cable bolt. Each splice tube includes an elongated conduit between a pair of spaced ends with the conduit adapted to receive at least a pair of cables therethrough. Cable attachments are provided on the trailing end of each cable bolt at a position on the cable bolt such that the splice tube is positioned between the cable attachment and the borehole. The cable attachment has a diameter larger than the inner dimensions of the conduit of the splice tube such that the cable attachment is adapted to abut against one end of the conduit of the splice tube.

Abstract: A plurality of designs for mine roof bolts is disclosed. Each mine roof bolt includes a flexible multi-strand cable having a first and second end with a drivehead formed on the first end, the drivehead having a plurality of driving faces on an exterior surface thereof. The drivehead is a separate member. A barrel and wedge assembly is attached to the cable wherein the drivehead is utilized substantially for rotating the cable.

Abstract: A cable mine roof bolt driver is disclosed for rotating a cable mine roof bolt in resin grouted applications. The bolt driver includes a body having a front face and a rear face. A cable receiving bore is positioned within the body extending into the body from the front face. The cable receiving bore is adapted to receive a cable of the cable mine roof bolt therein. A cable engaging device is provided within the cable receiving bore for rotatably engaging the cable such that rotation of the body will rotate the mine roof bolt when the cable engaging device has engaged the cable. A body rotation mechanism is coupled to the body for providing rotation of the body of the bolt driver. The cable mine roof bolt driver of the present invention can be utilized to rotate conventional cable mine roof bolts in resin grouted applications.

Abstract: The present invention provides a cable driving wrench assembly for thrusting and rotating a multi-strand cable mine rock anchor. The wrench assembly includes a wrench body having an open interior and a plurality of apertures in the wrench body extending into the open interior. Each aperture is adapted to receive an individual strand of the multi-strand cable when the individual strand has been separated from the remaining strands of the cable at least at one end of the cable. The open interior of the wrench body is adapted to receive one end of the cable through the plurality of apertures. A mechanism for thrusting and rotating the wrench body is attached thereto. The present invention additionally includes a cable opening tool for opening the strands of a multi-strand cable. The cable opening tool includes a rotatable tool body and a socket formed in the tool body.

Abstract: A method of anchoring a spirally wound multi-strand cable in a borehole by using resinous material intermixed with the cable strands upon gripping the cable strands at one end to unwind the strands initially for forcing the cable into a borehole and for rewinding the strands to restore the cable to its spirally wound condition, and apparatus for applying cable rotating and thrusting reaction for securing retention of the cable in a borehole with a resinous anchor material.

Abstract: A cable bolt mine roof crib for support and stabilization of roof rocks employing a series of cable bolts and/or cable members through a cribbing frame for actively supporting the roof and area surrounding an underground opening. The support imposes a restraint on geologic movement of the roof by the placement of rock anchors on the ends of cables at depth through the rock mass. The anchor portions of the cable bolts are placed beyond the zone of failure that would normally take place around an underground opening. The roof crib provides a bearing area for the roof rock which limits deformation and offers support by suspension to maintain interlock of rock fragments of the roof of the underground opening. The strength and length of cable bolts can be adjusted to fit initial tectonic load conditions and subsequent loads placed upon the opening by adjacent mining.

Abstract: A yieldable grout compactor for a cable roof support fixture adapted to be insertable in a uniform diameter borehole or in a stepped borehole in which the grout cartridge and compactor are insertable so as to have the cable perform the piercing and mixing function with respect to the grout material while the compactor is slidable on the cable caused by a sufficient degree of force to permit the grout to surround and anchor the cable. Compactor sleeves are sized with respect to the axial cable length and the internal and external diameters are sized to yieldably permit fixture installation and grout securement of the cable in a manner to obtain a secure anchor for the cable in the back of the borehole.