Abstract: A piering device includes a shaft having a polygonal cross-section with a series of notches spaced at intervals along the vertices of the shaft. For example, the shaft can have a square cross-section with rounded corners. The helical plate has a passageway with a cross-section to slide along the shaft when the helical plate is in a first rotational position on the shaft. However, notches within the passageway of the helical plate engage the notches on the shaft when the helical plate is rotated to a second rotational position, thereby preventing the helical plate from sliding along the shaft. A key is inserted between the shaft and helical plate to hold the helical plate in the second rotational position and thereby fix the axial position of the helical plate on the shaft.

Abstract: The present invention relates to a packing apparatus for pressure type soil-nailing and soil-nailing construction method using the apparatus, can shorten a grouting time through pressure type grouting which seals completely grouting area, and can improve stability of a ground reinforcing body by filling liquid grout to even a gap between a boring hole and the ground and void of the ground.

Abstract: A rock bolt (1) has a tubular body (2) with first and second ends (3, 4). The first end (3) is substantially sealed. A threaded rod (5) extends from the tubular body second end (4) for receiving a nut 102. A portion (6) of the tubular body (2) at the second end (4) is crimped on to the threaded rod (5). A rock bolt assembly is also disclosed comprising a rock bolt (1), a sleeve (105) coaxially mounted oil the rock bolt (1), a resin cartridge (104) received in the sleeve (105) and a collar (107) mounted on the leading end (106) of the sleeve (105) to engage a rock face and prevent the sleeve (105) from entering a hole in the rock face into which the rock bolt (1) is installed.

Abstract: A drilling apparatus for single pass bolting, the drilling apparatus comprising a drill steel assembly and a disposable drill bit, wherein the drill steel assembly comprises at least a drill steel having first and second ends, the first end of the drill steel being adapted to releasably operatively engage a drive for imparting rotational and impact energy and the second end of the drill steel is releasably operatively interconnected with the disposable drill bit, the drill steel being adapted to transmit rotational and impact energy to the disposable drill bit, and wherein the drilling apparatus is characterized in that a portion of the drill steel proximate the second end thereof is adapted to be received within a standard friction bolt, the drill steel assembly is provided with a flange adapted to drive the friction bolt into a body requiring reinforcement, and the drill steel assembly is adapted to allow facile disconnection of the disposable drill bit therefrom, whilst the drilling apparatus is embedded i

Abstract: A method and apparatus of re-tightening or retensioning a roof bolt in an underground mine serves the purpose of enabling the operator to place tension between the head of a permanent, epoxy-secured, roof bolt and the roof plate of a standard roof bolt system used to effect primary roof support in an underground mine. The method and apparatus have particular utility in mines in which drawrock or localized crumbling of shale of soft rock material is encountered as the first layer of material in the mine roof. The apparatus consists of a slotted screw member and slotted nut combination. A second embodiment of the apparatus is comprised of a slotted nut, slotted screw member, and one or more slotted spacers to be oriented between the roof bolt head and base plate. The members are turned with the appropriate tightening tool such as to apply pressure between the base plate and roof bolt head, thereby re-tensioning the roof bolt.

Abstract: A drilling and anchoring device comprises a drilling pipe (8), a drilling tool (12) mounted at the end of the pipe, and one or several cables (4) and/or other anchoring reinforcements. The cables and/or other anchoring reinforcements are so attached to the drilling tool that the drilling tool remains in a grout body (7) formed by cement injection in the ground surrounding a drilling hole (6).

Abstract: Cable bolt wedge barrel, installation apparatus and method, for cable bolt installation in a mine borehole provided an interior resin system, wherein the wedge barrel of the cable bolt employed, and the tool used to revolve and supply thrust to the same, are mutually designed for (1) mutual, operative, wall-friction and/or end-detent drive engagement within a given torque range for the resin system employed, as applied by said tool, and (2) operative slippage when said range is exceeded, thereby precluding the emergence of the undesirable condition of over-mixing the resin system present in said borehole and consequent diminution of the resin system's holding power relative to the cable bolt within the borehole.

Abstract: Cable bolt wedge barrel, installation apparatus and method, for cable bolt installation in a mine borehole provided an interior resin system, wherein the wedge barrel of the cable bolt employed, and the tool used to revolve and supply thrust to the same, are mutually designed for (1) mutual, operative, wall-friction and/or end-detent drive engagement within a given torque range for the resin system employed, as applied by said tool, and (2) operative slippage when said range is exceeded, thereby precluding the emergence of the undesirable condition of over-mixing the resin system present in said borehole and consequent diminution of the resin system's holding power relative to the cable bolt within the borehole.

Abstract: A mobile system for manufacturing and installing rock reinforcing members in mining and tunnel construction applications where a plurality of holes are drilled into the rock and each hole receives a reinforcing member and grout. The reinforcing member can be steel strand or some other suitable material. The system has a plurality of cooperating devices, all mounted to a mobile self-propelled platform. The devices comprise a spool of reinforcing material, a motivating device for drawing material from of the spool through the system, a measuring device, a crimping device to give the steel strands a corrugated shape, an articulating arm with a guide head to guide the material into the drill hole and a cutter to cut the material into strands of desired length. A plurality of strands can be installed in a given drill hole. The system also includes apparatus for grouting the drill holes using either a cementacious grout or a polyester resin grout. Methods of making and grouting the reinforcing member are disclosed.

Abstract: A screw form anchor device (10) intended for screwed penetration into a host material. The anchor device (10) includes a body (11) having a manipulating end (12) and a distal end (13). A screw thread (22) is formed by a plurality of tapering angular helix thread forms (22a) which extend from the distal end. Each angular helix thread form (22a) has an outward facing surface (24) and, relative to the distal end, a downward facing surface (25). In the preferred form an emergent helix thread (26) commences from a point distant from the distal end (13). This emergent helix thread (26) extends toward the manipulating end (12) of the body (11).

Abstract: The present invention provides a mining apparatus for installing bolts into a mine entry, said apparatus including: a frame having a forward end, a rearward end and lateral sides; an upstanding bolter support wall attached to said forward end of said frame; a laterally extending guide frame mounted to said support wall which extends along a lateral plane which is generally parallel to the support wall; at least one bolting rig slidably mounted to said guide frame; and translation means for selectively moving the bolting rig laterally along the guide frame relative to the support wall.

Abstract: Connection devices to improve utilization of synthetic deformed bars to transfer tensile loads. Attachment devices for connection of thin wall face panels to mechanically stablized earth walls with minimal tensile loads. Horizontally disposed synthetically deformed bars or other tensionable members utilized to combine precast retaining wall elements.

Abstract: A combination anchoring pin and insertion apparatus which includes a vertically disposed elongated barrel having an axial bore and an elongated hammer drive rod slidably received within the bore with the upper end extending above the top opening of the barrel and having a handle secured to the upper end of the rod. A side opening is provided in the barrel for sequentially introducing anchoring pins therethrough into the bore and a pin guide chute is secured to the barrel and aligned with this barrel side opening for sequentially feeding anchor pins through the side opening in guided alignment. An anchoring pin retainer is positioned in the barrel bore below the side opening to receive, retain and position the anchoring pins sequentially under the lower end of the drive rod for sequential downward driving engagement or hammering by the drive rod.

Abstract: The present invention provides a single bore multiple anchorage in which a plurality of unit anchorages (2, 4) are contained in a single bore, the unit anchorages (2, 4) each comprising a tendon (12, 14) having a bond length bonded to the bore grout and a free length, wherein at least one of the tendons comprises a synthetic polymeric material. The ground anchorage means may be made by placing a plurality of unit anchorages in a bore, pouring grout into the bore and stressing each of the tends separately and locking the stressed tendons individually with respect to the anchor head.

Abstract: An earth anchor has a thin, elongate base to facilitate its introduction into the earth. Strengthening ribs extend along its longitudinal extent on both sides of the elongate base. The distal end of an anchor strap is secured to the elongate base and a proximal end of the anchor strap remains above the surface of the earth so that it can be pulled upon when the elongate base has reached a desired depth. In a preferred embodiment, a water jet positioned at the leading end of the elongate base bores a hole into which the earth anchor is inserted. Pulling on the anchor strap causes the elongate base to rotate about its trailing end until it assumes a horizontal, deployed position. Items secured to the proximal end of the anchor strap are held firmly to the ground because the deployed earth anchor offers substantial resistance to displacement.

Abstract: In a slope stabilising means, a single borehole (4) comprises both a ground anchorage (7) and a soil nail means (18), comprising a tensile member bonded to the bore grout along substantially its whole length. The slope stabilising means has the advantage of allowing the ground to be pre-stressed using the ground anchorage means (7). However, the active zone of the ground (2) is also stabilised by the soil nail means (18), which allows a lighter facing structure (24) to be used than is normal with ground anchorage means. Economy of operations is obtained, as a number of items are included in a single borehole.

Abstract: A cable bolt comprises a cable with a tubular yielding fixture at one of its ends. The pull-off load of such yielding fixture can be adjusted to a desired value. This is achieved by unwinding one end of the cable and inserting a slug over the kingwire. Then, the peripheral wires are wound again over the kingwire forming a bulge in the cable where the slug is located. The yielding fixture is then slid on the cable and forced over the bulged portion of the cable, while measuring the load required to achieve this operation, which also becomes the pull-off load of the yielding fixture. Finally, any part of the cable protruding from the fixture is cut-off to form the cable bolt with the desired yielding fixture at its end.

Abstract: A retaining wall anchoring system for a segmental retaining wall comprising a plurality of tieback rods adapted to be embedded into soil or rock with a proximal portion extending therefrom, at least one elongated force distribution member positionable directly adjacent the proximal portion of at least one of the tieback rods, a washer positionable about the proximal portions of the tieback rod in abutment with the force distribution member, and a fastener fixedly securable to the proximal portion of the tieback rod to securely clamp the washer against the force distribution member such that tensile forces imposed on the tieback rod are transmitted to the force distribution member so as to distribute these forces throughout a portion of the retaining wall.

Abstract: A mortar composition, curable by frontal polymerization after heat initiation, is described, wherein are contained a) at least one polymerizable monomer and/or at least one curable resin, b) at least one polymerization initiator, which can be activated and/or released thermally at a temperature above 30° C., for the polymerizable monomers and/or curing accelerator for the curable resin and c) optionally at least one filler, the nature and amount of polymerizable monomer or curable resin and polymerization initiator or curing accelerator being selected so that a polymerization front velocity of at least 10 cm/min results after the polymerization is initiated, as well as a method for fastening tie bars, reinforcing steel or the like in solid substrates.

Abstract: A connection for securing the longitudinal wires of a soil-reinforcing mat to a face element for an earthen formation is provided by converging the lead ends of the wires toward one another and securing a connecting rod between the ends. The rod is extended into engagement with an anchor on the face element. A variety of structures are provided for securing the rod against separation from the anchor. To enable the mat to move in a horizontal plane relative to the face element, the rod may extend in a direction normal to the mat and be rotatably received in a vertically extending opening in the anchor.

Abstract: A rock stabilizing apparatus and method for use with adhesion materials has a tensionable reinforcing member having a threaded portion at one end and an opposite end. The member-threaded portion threadably receives a nut and a bearing plate is retained on the member-threaded portion by the nut. A shearing element is provided for temporarily fixing the nut in a first operating position. At a predetermined torque, the shearing element fails and the nut is freed to advance on the threaded member portion from the first temporary operating position to a second permanent operating position. The first fixed operating position is located at the top end of the member-threaded portion. The second operation position is located at the bottom end of the member-threaded portion so that the bearing plate is in abutting contact with the face of the rock formation. In its first operating position the nut and reinforcing member may be rotated together for mixing the adhesion materials located within the drill hole.

Abstract: In an anchor rod (1) for a synthetic resin adhesive anchor having a shaft (2) with a plurality of area segments (4) arranged in axial succession, the surface of which is low-friction with respect to synthetic resin mortar (6), areas (4) are formed. Viewed in a circumferential direction, the areas are arranged side by side such that a desired splitting zone (9) is created in the transition region of two adjacent areas (4) of this type.

Abstract: An artificial root system for gabions to control soil erosion has an anchor which has a nose cone threadable onto a threaded rod and deployable stainless steel blades. On deployment of one or more anchors on each of a series of rods, connectors are attached to the rods. These connectors have four couplers to receive the ends of threaded rods or bars, and a central coupler to receive one (passing through) or two (meeting) threaded rods or bars. Threaded cross bars or rods are attached to the connectors to form a framework to support geotextiles attached to the cross bars or rods to form a gabion, or gabion array. The gabions are then filled with suitable material, to repair, or replace eroded shoreline, river frontage, lake frontage, etc.

Abstract: The mechanical anchor according to the present invention comprises an anchor unit, said anchor unit being divided into a plurality of divided anchor units movably connected to a tension rod so that it can be moved in lateral direction, said anchor unit being opened or closed by the movement of the divided anchor units, and said anchor unit being turned to cylindrical shape when the divided anchor units are closed, a driving member for opening or closing the anchor unit is mounted on inner side of the anchor unit in such manner that the driving member is extended in longitudinal direction of the anchor unit, and the driving member and each of the divided anchor units are connected with each other so that driving force of the driving member is equally applied on each of the divided anchor units.

Abstract: A tubular anchor including a tubular member (1) having, at its one end, a crown-shaped drilling head (2) and, at its opposite end, a load application element a substantially cylindrical hollow element (7) filled with a mortar mass (4), located inside the tubular member (1), and having, at its end facing in the direction opposite to the setting direction, an opening (11) enabling flow of the mortar mass therethrough, and at least one longitudinal channel (12) communicating the opening (11) with an outlet opening (5) provided in the region of the drilling head (2).

Abstract: A rockbolt assembly for securement within a borehole generally comprising a rockbolt, an anchor, a hollow tube assembly, a faceplate and a nut. The rockbolt has a threaded free end and a second end associated with the anchor. The hollow tube assembly has open first and second ends and an internally extending threaded portion configured to engage the rockbolt. The threaded portion is positioned between the ends with respective first and second tube areas defined on opposite sides thereof. At least one channel is defined in the tube assembly and extends from one tube area to the other such that a continuous passage traversing the threaded portion is defined between the ends of the tube assembly. The nut engages the tube assembly and the faceplate such that tightening of the nut about the tube assembly is translated through the rockbolt to cause engagement of the anchor.

Abstract: A multi-purpose anchor bolt, which performs two principle functions: (1) it acts as an active reinforcement for the ground when it is installed and tensioned, and (2) it is used to excavate and advance the face in steps. The invention also includes the method of the multi-purpose anchor bolt's use. This invention is a hybrid of traditional and mechanized excavation techniques.

Abstract: A tubular anchor includes a tubular member (1, 21) with a drilling head (2, 22) at one of its end, a load application element (3) extending along a portion of the tubular member opposite the one end, opening (5, 23) provided in a region of the drilling head. The tubular anchor also includes at least one, substantially cylindrical, hollow element (7, 24, 25) for receiving a mortar mass (4, 37, 38) and closed, at its opposite ends, with two displaceable pistons (8, 9; 31, 32, 33, 39), respectively, with one of the pistons being received in a piston-receiving region of the at least one mortar-mass receiving element and facing in a setting direction (S), (6, 35) and at least one through-opening (11, 34) spaced from a free end of the piston-receiving region (6, 35) by a distance (a, b) corresponding at least to a length (l) of the piston (8, 32) received therein.

Abstract: A resin nozzle positioner for a rock bolter, having a frame supporting feed tracks traversed by a drill and a bolt driver, has a resin nozzle that guides a resin sausage into a hole drilled along a work axis. A positioner base is fixed to the frame and two arms are pivotably connected to the positioner base and to a nozzle block, to which the resin nozzle is mounted. The arms remain parallel and move such that the resin nozzle remains parallel to the work axis while moving along an arc between a retracted position, where the resin nozzle is spaced apart from the work axis, and an extended position, where the resin nozzle is aligned with the work axis. An actuator operably connected to two elements selected from the arms, the positioner base, and the nozzle block serves to move the resin nozzle.

Abstract: A truss system for supporting a face of a passage in a geological structure, such as a mine roof. A truss support bracket is carried on the proximal end of an anchor positioned adjacent each of a pair of spaced boreholes formed in the face or mine roof. At least one of the brackets includes a retainer, such as a split wedge retainer, for receiving a corresponding end of a truss member, such as an elongated cable, spanning across the adjacent face. A rotary fastener threaded to the proximal end of each anchor holds each bracket in place. Using a motive device, such as the rotational socket on a bolting machine, a selected one of the fasteners is rotated such that the corresponding bracket is drawn along the anchor and at least partially into the borehole to tension the truss member. To provide the desired support, one or more plates are carried on the truss member engage the face once tensioning is complete.

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).

Abstract: A rock bolter has a drill and a bolt driver, both mounted to a turret that rotates relative to a base to align either the drill or the bolt driver with a work axis. A stinger/centralizer has two head elements, each advanced along a curvilinear path. When advanced, the head elements mate to provide a centralizer passage on the work axis. A supplementary stinger affixed to the base extends to engage the rock surface and provide stability as the head elements are retracted. The drill and the bolt driver are mounted on carriages activated by a common mechanism. A drill carriage disabling surface is affixed to the base to block the drill carriage when the drill is off the work axis, and a bolt driver carriage disabling surface is affixed to the base to block the bolt driver carriage when the bolt driver is off the work axis.

Abstract: A multi-purpose anchor bolt, which performs two principle functions: (1) it acts as an active reinforcement for the ground when it is installed and tensioned, and (2) it is used to excavate and advance the face in steps. The invention also includes the method of the multi-purpose anchor bolt's use. This invention is a hybrid of traditional and mechanized excavation techniques.

Abstract: An expansion anchor to be set in a bore of a constructional component and including an anchor member (1) having, at its end facing in a setting direction, an expansion region (5), a guide region (6) remote from the setting direction end of the anchor member (1), and a transition region (8) located between the expansion (5) and guide (6) regions and having at least one opening (10) and at least one salient tab (12) provided in a region of the opening; and a cone (3) for expanding the expansion region (5) of the anchor member (1)

Abstract: A tensionable mine roof bolt is constructed of multi-strand steel cable. The head end of the bolt is formed of an outer sleeve that is externally threaded at least part of the way from the end, in order to accept a conventional tension nut. The cable bolt shaft includes an enlarged section that is slightly larger than the diameter of the axial bore through the bolt head sleeve so that the cable enlarged section interferes with the bolt head sleeve as the enlarged section is pressed into the outer sleeve to form the cable bolt. The cable enlarged section is formed by the addition of a spacer sleeve around the cable center strand (king wire) and between the cable center strand and peripheral strands, or by the addition of a cable sleeve around the cable at the appropriate location.

Abstract: This invention is directed to a method of re-tightening or re-tensioning a roof bolt in an underground mine. Specifically, the method and apparatus claimed herein serves the purpose of enabling the operator to place tension between the head of a permanent, epoxy-secured, roof bolt and the base plate of a standard roof bolt system used to effect primary roof support in an underground mine. The method and apparatus have particular utility in mines in which drawrock or localized crumbling of shale of soft rock material is encountered as the first layer of material in the mine roof. The apparatus consists of a slotted screw member and slotted nut combination. A second embodiment of the apparatus is comprised of a slotted nut, slotted screw member and one or more slotted spacers to be oriented between the roof bolt head and base plate. The members are turned with the appropriate tightening tool such as to apply pressure between the base plate and roof bolt head, thereby re-tensioning the roof bolt.

Abstract: Apparatus, method, and a kit for a yieldable tendon mine support rock anchor include structure and/or steps including the provision of a metal support member having an outside diameter which is less than a diameter of the rock hole. Preferably, resin cartridges are disposed inside the rock hole. A wedge anchor is provided and is disposed at a distal end of the metal support member and has a narrow portion disposed uphole from a wider base portion thereof. The wedge anchor base portion is narrower than the diameter of the rock hole to permit un-solidified resin to pass from downhole to uphole of the wedge anchor base portion. The wedge anchor is dimensioned to crush solidified uphole resin and permit downhole movement of the crushed solidified resin when a yielding tension is applied to the metal support member and the wedge anchor moves uphole.

Abstract: A connection for securing the longitudinal wires of a soil reinforcing mat to a face element for an earthen formation is provided by converging the lead ends of the wires toward one another and forming aligned coils distally on the lead ends. A pin extending through the coils secures the soil-reinforcing mat to the face element for pivotal movement relative thereto in a horizontal plane. A variety of means are provided to secure the coils against unwinding in response to tension force applied to the wires.

Abstract: A connection for securing the longitudinal wires of a soil-reinforcing mat to a face element for an earthen formation is provided by converging the lead ends of the wires toward one another and securing a connecting rod between the ends. The rod is extended into engagement with an anchor on the face element. A variety of means are provided for securing the rod against separation from the anchor. To enable the mat to move in a horizontal plane relative to the face element, the pin may extend in a direction normal to the mat and be rotatably received in a vertically extending opening in the anchor.

Abstract: A stake suitable for use in construction is formed from an elongate threaded metal member, typically of length between 0.45 meter and 1.8 meter, having two ends. A first end region, tapered to a sharp point over typically 3 centimeters, is suitable to be plunged into earth. A middle region has threads that are both deeply cut, typically at a ratio of root diameter to outside diameter less than 0.80, and steeply inclined, typically at least 1 in 20. A second end region has a feature in the shape of a regular prism suitable to be engaged by a torquing tool for rotation of the entire stake. The second end region feature may be a prism of regular cross section, normally a hexagonal prism, of a diameter everywhere less than the minor diameter of the middle region's threads.

Abstract: This invention is directed to an improved method and apparatus for providing secondary roof support in an underground mine such as to reduce the hazard of localized crumbling or deterioration of a mine roof. The apparatus of this invention generally comprises a slightly convex steel plate, crafted to cradle a roof bolt and which is supported by the base plate of the primary roof control system. The invention is made to be utilized with standard primary roof bolt systems. By applying an upward pressure on the roof and effecting a larger coverage area for each roof bolt, the opportunity for drawrock separation to begin is reduced, and the exposure of the elements to drawrock strata in the vicinity of the bolt is eliminated. The method of the present invention includes the step of utilizing the apparatus of the present invention, with convex portion of the lateral plate facing upwards, before the placement of the base plate and roof bolt.

Abstract: A soil reinforcing resin net including hole portions arranged in the longitudinal and transverse directions of the resin net, each of which is formed by a pair of opposed ribs and a pair of opposed bars, wherein projecting portions are fixed on bar portions; a method of producing the soil reinforcing resin net; and a drawn product of a polyethylene based resin suitably used as the soil reinforcing resin net, which is obtained by drawing a polyethylene based resin composed of a linear ethylene main chain having 0.3 or more of saturated hydrocarbon groups branched thereto in one molecule.

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: An elongate roof bolt includes a bolt body having an axially extending central bore and defining a leading end. The leading end includes a pair of axially extending abutment elements formed by machining. Each abutment element includes an abutment face for engagement with a drill tip on opposite sides thereof, to transmit rotary forces during drilling. The drill tip extends across the leading end of the bolt body and is bonded to the abutment elements by welding, soldering or brazing. The bore opens out of said bolt bonded adjacent said leading end.

Abstract: A roof bolting apparatus comprising a frame, a rotary drive mounted on the frame for rotating a workpiece rod used in a mining operation, a timber jack rod supported by the frame, the timber jack rod having an upper end and having therein a hydraulic passage, a top plate mounted on the timber jack rod for movement therewith, the top plate having therein a hydraulic circuit communicating with the hydraulic passage in the timber jack rod, and first and second hydraulic cylinders movably mounted on the top plate, the cylinders communicating with the hydraulic circuit in the top plate, and each cylinder having an end defining a jaw, such that hydraulic fluid flow into the cylinders causes the ends of the cylinders to move toward each other, thereby causing the jaws to move together for holding the workpiece rod therebetween.

Abstract: A tendon 10 is installed in a hole 34 in a mine hanging wall 36 by making use of a barrel 14 and a wedge arrangement 16. One end of the tendon is anchored in the hole 34 such that the other end protrudes therefrom. The barrel 14 is positioned over the protruding end of the tendon 10. A tensioning jack applies a tensile load to the tendon 10 and an oppositely disposed load to a shear ring 20 of the barrel. When the desired preload is reached the shear ring 20 fails permitting the tensioning jack 40 to displace wedge elements 30 of the wedge arrangement 16 inwardly thereby locking the barrel on the tendon and maintaining the desired preload in the tendon.

Abstract: A tensionable mine roof cable bolt having a resin grouted upper portion and a mechanical anchor. The cable bolt is rotated during installation in a mine roof bore hole to mix resin and engage the mechanical anchor with the rock. A drivehead press fitted onto the lower end of the cable may be stripped off the bolt upon tensioning of the bolt to a predetermined load.

Abstract: A package of rock stabilizer sets and a method for arranging the sets where six sets are provided and each set includes an elongated tube and a bearing plate. Each tube has a tapered end, an end with a flange, and a slit running the length of the tube. Each bearing plate has a flat base and a central domed section having a central aperture therethrough. In a first embodiment, the tubes of four of the sets are arranged in a first or bottom layer so that the flanged and tapered ends of the tubes are aligned alternatively and the slits face downwardly. Next, the plates of three of the sets are placed along the length of the four tubes so that the domed sections face upwardly, thereby forming a second layer. A third layer is formed by placing the three remaining plates on top of the first three plates, respectively, so that the domed sections of the second layer nest within the respective domed sections of the third layer.

Abstract: A tool for facilitating the spinning of a wire-strand cable bolt, the tool having a cable bolt end engagement socket which is configured to engage positively such cable bolt end an appreciable distance.

Abstract: An improved wing-type ground anchor. The ground anchor includes a central body portion, wings radiating laterally from the body portion, and a leg portion at the front end of the body portion GROUND ANCHOR that operates like a star-point drill for penetrating the ground. The sides of the leg portion each include a plurality of sharpened leading side edges which are longitudinally offset from each other. Each of the wings also includes a plurality of sharpened leading side edges which are longitudinally offset with respect to each other. The offset leading side edges and wing edges progressively extend greater distances laterally outward from the body portion along the length of the leg portion and the wings. Since smaller side edges and wing edges are advanced first, the staged side and wing edges facilitate passage of the ground anchor through soil.