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 fastening element including a cylindrical body (1) having, in its end portion remote from an end facing in a setting direction, a longitudinal bore (22) for receiving a mortar mass, and having, at it end facing in the setting direction, at least one through-opening (5) connecting the longitudinal bore (22) with an outer surface of the body (1), and a mixing device (8) located in the longitudinal bore (22) between the mortar mass and the through-opening (5).

Abstract: Improvements to a rock bolt and a method of forming a rock bolt are disclosed. The rock bolt includes at least one paddle section that is formed by applying an eccentric shear force to the shank of the bolt from opposite sides of the bolt. The paddle section is thereby comprising an eccentrically deformed portion of the shank of the bolt. The rock bolt is adapted for use in a hold sized to receive the bolt with a clearance fit. A resin mixture contained in the hold is cooperable with the paddle section of the rock bolt to secure the bolt within the hole.

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 mixing delay device for use with tensionable cable bolts wherein the mixing delay device compresses or is uncompressed in response to a compression force applied to the mixing delay device, wherein the mixing delay device increases resin mixing time, provides a visual indication of tensioning, and helps to reduce de-tensioning of the tensionable cable bolt.

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 chemical anchoring adhesive having a solid, putty-like consistency includes two parts in direct contact with each other along an interface. The first part includes about 20-45% by weight of an epoxy resin, about 10-40% by weight of a first particulate filler having an oil absorption value of at least about 30, and about 40-65% by weight of a second particulate filler, at least about 70% of which has a U.S. Sieve size between 16 and 45. The second part includes about 5-20% by weight of an aliphatic amine compound, about 0.1-15% by weight of a tertiary amine compound, about 1-23% by weight of a first particulate filler having the oil absorption described above, and about 52-87% by weight of a second particulate filler having the U.S. Sieve size described above.

Abstract: A method of making and applying a chemical anchoring adhesive in the form of a highly viscous, self-contained rope or slug is provided. The rope or slug has an average cross-sectional area determined from a formula that takes into account the cross-sectional area of a borehole, the average cross-sectional area of an anchor pin to be inserted into the borehole, and a penetration factor which reflects penetration of the adhesive into the walls of the borehole. By selecting the proper area for the anchoring adhesive, the rope can be cut into slugs having depths equal to the depths of boreholes. When the slugs are inserted into the boreholes, and anchor pins are driven, the amount of adhesive provided by each slug will be just enough to completely fill the interstitial spaces between the anchor pin and inner wall of the borehole, accounting for penetration of some adhesive into the borehole wall.

Abstract: A method of applying a chemical anchoring adhesive to the interior of a borehole includes the steps of providing a highly viscous, self-contained slug of chemical anchoring adhesive, inserting the slug into the borehole, providing an anchor pin, and driving the anchor pin into the borehole using a driving tool that imparts rotary motion to the anchor pin. The adhesive slug includes a first part having a first color and including a resin, and a second part having a second color different from the first and including a curing agent. The rotary motion of the anchor pin mixes the first and second parts together to form a substantially homogeneous composition having a third color different from the first and second colors. The visual indication provided by the third color notifies the worker when the mixing is complete, saving time and money at the construction site while minimizing the occurrence of defective or insufficient mixing.

Abstract: A jacket tube for a device for drilling holes and forming an anchorage in the earth or rock. The jacket tube is coupled with a drill pipe and/or a drill bit or a drill hammer and is configured with a plurality of through openings across its periphery. Once the borehole has been made, or after an anchor has been introduced, the jacket tube can be filled with a hardenable suspension. The jacket tube consists of at least one expanded metal element which has evenly distributed through openings and connecting elements, especially sleeves, at the ends for connecting to a drill bit and/or other jacket tube elements. The borehole is therefore easy to produce and the jacket tube can be anchored securely.

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: 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: An expansion assembly configured to be attached to a mine roof bolt, wherein the expansion assembly may include a plug defining an interior cavity and an outer surface and an expansion shell having a plurality of spaced-apart prongs, preferably three prongs, and defining a plurality of shell grooves, wherein each of the spaced-apart prongs is oriented diametrically opposed to a corresponding shell groove.

Abstract: A chemical anchoring adhesive includes first and second parts each having a highly viscous, putty-like consistency. The first and second parts are joined directly to each other along an interface. The first part includes a resin, and the second part includes a curing agent. The anchoring adhesive does not require separate encapsulation of one or both parts, and can be formed and cut to desired sizes and quantities at any stage before insertion into a borehole.

Abstract: An anchor rod to be received in a bore filled with mortar mass including a connection region (2, 22, 32) having a plurality of axially arranged one after another, conical enlargements (4, 24, 34) a diameter of which increases in a setting direction and which are provided with circumferential sections (5, 25, 35) radially spaced from a longitudinal axis of the anchor rod (1, 21, 31) by a greatest distance, having a radius (r) smaller by from about 0.1 mm to about 1.5 mm then a half of a nominal diameter of the anchoring region receiving bore, and extending, respectively, in a circumferential direction over an angle of up to 300°.

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.

Abstract: The curable epoxide composition, suitable especially for fastening anchoring means in boreholes, contains polyepoxide, polyamine, polyacetoacetate, a metal compound as well as, optionally, further constituents. As further constituents, filler, diluents, curing catalysts, rheological aids, wetting agents, dyes and pigments, and the like come into consideration.

Abstract: An injection or grouting body for the transfer of mechanical stresses in structures in above-ground or below-ground construction, and for insertion into a borehole, in slits or similar openings, has a centrally-arranged filling tube and at least one fabric stocking surrounding the filling tube. The filling tube is embodied as a fabric stocking and one or a plurality of reinforcing wires and/or rods, and/or pipes and/or ridged sheet metal strips are arranged on site so as to be adaptable, axis-parallel between the fabric stockings. An outer closed fabric stocking is arranged along the axis of the injection body about its inner filling tube (Fabric tube) that is open at its lower end. The reinforcing wires or rods are arranged on the outside of the inner fabric stocking and are attached to the fabric of the outer stocking in such a way that it can be ensured that, following filling or grouting, the reinforcement will remain in position.

Abstract: Anchor systems for joining structural members include a resiliently deformable member such as a dished washer to permit easy visual determination that the anchor system is correctly tightened in place. Post-tensioned anchor systems of the kind disclosed are particularly suitable for joining structural members, such as end-to-end columns. One of a number of mold parts, including a threaded tapered mold part, forms a threaded tapered hole in a poured concrete structural member for use with anchors, and passages permitting the introduction of a resinous securing agent may be formed in cooperation with the threaded tapered holes. Highway barriers can be formed with such holes and joined with the resin filling the holes and space between barrier ends.