Abstract: A friction rock bolt assembly is arranged to frictionally engage an internal surface of a bore formed in rock strata. The rock bolt includes an expander mechanism having at least two radially outer wedge elements engageable by an inner wedge element. The expander mechanism is configured for symmetrical displacement of the expander elements to provide controlled enlargement by the rock bolt within the borehole for secure anchorage.

Abstract: An elongated connecting element for anchoring members, which is provided with a first anchoring end portion designed to be inserted into an anchoring region and a second end portion which defines a head, which lies opposite the first anchoring end portion and is designed to interact with an element to be anchored. The elongated connecting element includes an external tubular element which accommodates an internal elongated body, the external tubular element defining, at the head, at least one feeding port for a synthetic anchoring mix and, at the first anchoring end portion, at least one exit opening for the synthetic anchoring mix. The synthetic anchoring mix is configured to set, penetrating at least partially into the anchoring region and creating a stable connection between the anchoring region and the elongated connecting element and between the respective portions of the external tubular element and of the internal elongated body.

Abstract: A rock bolt (10) to be received in a drilled hole comprising a threaded shaft (12) and a sleeve (14) into which the shaft (12) is received. A plurality of openings (38) are provided along the length of the sleeve (14) and clamping assemblies (16) each having clamp members (36) are provided adjacent each opening (38). Wedge members (26) are located adjacent each of the clamp members (36) and the wedge members (26) each include a threaded bore for receiving the shaft (12) such that rotation of the shaft (12) moves the wedge members (26) into engagement with the clamp members (36) to move the clamp members (36) outwardly through the openings (38) to engage with an inner surface of the hole.

Abstract: A friction rock bolt assembly is arranged to frictionally engage an internal surface of the bore formed in rock strata. The rock bolt includes a loading mechanism provided at a rearward end of the rock bolt having a load absorber to absorb an initial predetermined loading force followed by transfer of the force to a main load element.

Abstract: A rock bolt (10) is provided for frictionally engaging with the internal surface of a bore drilled into rockmass. The bolt comprises a tube having a circular cross-section (12) defining a longitudinal split (14) and a longitudinal axis (10a). The tube (12) in is radially expandable. The bolt (10) has a first leading end (12b) for insertion into a bore, a second end defining a head (12a) and expander means (30) for expanding the diameter of the tube at least one location along the tube. The expander means comprises first (42) and second (44) expander/wedge elements arranged so that relative movement of the two elements causes the diameter of the tube to expand at that location. The first expander element (42) is mounted on an elongate rod (30) which is aligned generally along the longitudinal axis of the tube. Rotation of the rod (30) causes the relative movement of the two elements to cause the diameter of the tube to expand at the location.

Abstract: A friction bolt assembly, such as for use with a pneumatically actuated drill, with a friction fit tubular sleeve longitudinally extending between a leading end and a trailing end, a rod which longitudinally extends through the sleeve between a first end and a second end, and which projects from either end of the sleeve to define, between the first end of the rod and the leading end of the sleeve and the second end of the rod and the trailing end of the sleeve respectively, a leading part and a trailing part, an expansion element mounted on or formed with the rod, on the leading part, a drill engaging element axially fixed in position on the second end of the bolt and engageable with a chuck or an end of the rock drill, a first load bearing formation mounted on the trailing part of the rod and which engages the trailing end of the sleeve, and a second load bearing formation mounted over the trailing part of the rod between the first load bearing formation and the drill engaging element.

Abstract: Disclosed is a rock bolt assembly for installing a mesh panel against a rock face which includes a rock bolt which has an elongate body extending between a first end and a second end, a cylindrical bush engaged with the bolt body, towards the second end, the cylindrical bush having a plurality of annular or arcuate grooves formed in an exterior of the surface of the bush and a washer having a plate-like body with an aperture formed there through.

Abstract: A removable single side fastener with ultra-low stake height grip range is disclosed. The fastener includes a housing body, a threaded screw, a drive nut and a collet body. The housing body has a housing head portion and a shank portion extending from the housing head portion with the shank portion forming at least two longitudinal slots. The threaded screw, disposed within the housing body, has a head portion rotatably confined within the housing head portion. The drive nut is rotationally coupled to the threaded screw and rotationally constrained relative to the housing body. The collet body has a pair of collet body legs converging inwardly. Each collet body leg has a toe which may extends radially outward beyond the longitudinal slots to compress work pieces against the housing head portion for fastening.

Abstract: A friction bolt assembly to frictionally engage a bore formed in rock strata includes an elongate tube and an expander mechanism acted on by an anchor mechanism via an elongate bar or cable. A retainer mechanism is mounted to act between the bar or cable and the tube to prevent ejection of the bar or cable from the assembly should the bar or cable break.

Abstract: A friction bolt assembly includes: an expansible sleeve having a tubular body between leading and trailing ends, which body has a longitudinally extending formation about which the body resiliently deforms and which formation extends along at least part of the body, ending at the body leading end; a rod extending through the sleeve body and between first and second ends and on which a projecting part is defined between the trailing end of the sleeve body and the second end; an expansion element on the rod at the first end; a first load bearing formation on the projecting rod part, moveable along the projecting part to abut the sleeve trailing end; a load applicator on the projecting part of the rod; and a second load bearing formation mounted over the projecting part of the rod between the first load bearing formation and the load applicator unit.

Abstract: It includes a surfboard body, a fin box, a fin seat, and multiple screw members. The fin box is embedded with the surfboard body and has a box recess and box holes. Each box hole has several circular slots. The fin seat has a fin and securing portions. Each securing portion has several curved plates for enclosing a receiving space. Each screw member has a tapered portion with an outer threaded portion. When the screw member is rotated in, these curved plates will gradually expand outwards and force the outward protruded portions engaging into the corresponding circular slots. So, the fin seat and the fin box are engaged together. When the screw member is rotated out, the fin seat and the fin box can be separated. About this invention, the fin seat and the fin box can be firmly secured together. Plus, its fin seat can be replaced easily.

Abstract: A rock bolt includes an elongate metallic body having a first end and an opposed second end, a threaded portion at the second end, for attaching thereto and locating thereon, a nut and a bearing plate, a mechanical anchor at, or at least partially located on, a first end portion of the body and a first resistive anchor, located between the threaded portion and the mechanical anchor.

Abstract: Photovoltaic mounting systems that form chemical flashings are provided herein. Such sealant injection systems provide directional control and containment of sealant flow to form a chemical flashing that improves sealing of roof penetrations. Such systems can include a base assembly adapted to mount to a roof surface and support a mounting bracket having a photovoltaic module coupling device. The base assembly can include a sealant guide, a compressing plate and a sealant cartridge held between the guide and compressing plate by one or more coupling features of the guide. The coupling features can include a first set of features, such as a series of tabs, that facilitate coupling between the guide and the compressing plate. The base assembly can further include a base that releasably couples to the sealant guide by a second set of coupling features. Methods of mounting such base assemblies on roof surfaces are also provided.

Abstract: A locally-anchored, self-drilling, deformable, hollow rock bolt has one or more intermediate local anchors each of which is flanked by two relatively elongateable shank segments. After grout is supplied through the hollow interior of the rock bolt while the rock bolt is in the drilled borehole, each anchor fixes the bolt to the rock mass, whereas the adjacent smooth shank segments can deform and even yield to accommodate rock fracture. The local anchors may be of relatively short extent when compared to the shank segments. One or more of the intermediate anchors could be formed by a coupler connecting adjacent bolt sections together and/or by shaping the bolt and/or by providing an external anchor. The innermost end of the rock bolt may be formed from or bear a drill bit. The drill bit can have dual functions of drilling the borehole and serving as the innermost anchor of the bolt.

Abstract: A friction bolt for frictionally engaging the internal surface of a bore includes a circular tube, which is split longitudinally, and which has a leading end and trailing end. An expander mechanism is disposed within the tube towards the leading end. An elongate bar/cable is disposed within the tube and extends between the expander mechanism at one end and an anchor arrangement at the other end. The bar/cable extends through a ring attached to the trailing end into connection with the anchor arrangement. A restrainer member is disposed within the tube adjacent the ring and extends at least partially about and in engagement with the bar/cable. The tube has a weakened region adjacent the ring and the restrainer member extends longitudinally within the tube past the weakened region. The restrainer member includes a projection that projects through the longitudinal split of the tube for engagement with the bore.

Abstract: Photovoltaic mounting systems having sealant injection system are provided herein. Such sealant injection systems provide improved directional control of sealant flow and improved sealing of roof penetrations during mounting with one or more fasteners. Such systems can include a bracket assembly having a removable sealant injection package. The sealant injection package includes a collapsible sealant injection reservoir and is adapted to provide directionally controlled release of sealant upon collapse. Such a system can further include sealant injection guides that direct flow of sealant during mounting and pads or caps that cover and enclose the injected sealant so as to ensure adequate sealing of any roof penetrations and maintain its integrity over time. Such systems further allow for sealant injection packages to be interchanged or replaced as needed and allow for ready removal or replacement of the bracket after mounting while maintaining the seal of any roof penetrations.

Abstract: A storage and retrieval system including a vertical array of storage levels, each storage level having storage locations, a multilevel vertical conveyor system configured to transport the uncontained case units to and from the vertical array of storage levels, each storage level being configured to receive uncontained case units from the multilevel vertical conveyor system, at least one autonomous transport confined to each storage level, the at least one autonomous transport being configured to transport the uncontained case units between respective storage locations and the multilevel vertical conveyor system, and a controller configured to effect operation of the multilevel vertical conveyor system and at least one autonomous transport for assembling orders of uncontained case units of different types without moving bundles of the same uncontained case unit type throughout the storage and retrieval system.

Abstract: Disclosed is an anchor having a sleeve and a concentric shaft having head at one end with a rectangular plate through with the shaft interposed between the head and the adjacent end of the sleeve. A deformable plate is positioned on the shaft between the head and the sleeve so that movement of the sleeve along the shaft towards the head deforms the plate from a configuration where the plate is substantially confined to an area within the perimeter of the head into a substantially planar configuration where the perimeter of the plate extends at least partially beyond the perimeter of the head. Also disclosed is a method of fixing the anchor in a bore hole with the ends of the plate in an undercut in the bore hole and filling the bore hole with resin while venting air via a passage extending from adjacent to a closed end of the bore hole through a suitable cover.

Abstract: A cable bolt comprises a cable having an elongate body with a first end and a second end, a barrel and wedge assembly attached to the cable at a position adjacent to the first end of the cable, and a seal member having a body defining a passageway that receives a portion of the elongate body of the cable. The body of the seal member includes at least one rib extending radially outward from the body of the seal member.

Abstract: In a rock anchor bolt a centering member includes an outlet hole for removing any leakage water flowing into a borehole. The rock anchor bolt includes a sealing device provided around the outer end of a tube to seal the borehole watertight as a tightening nut is being tightened, and an outlet tube provided in a casting space between the tube and a drawbar to carry out the leakage water as grouting paste is being injected, the inner end of which outlet tube extends to the vicinity of an expansion member and the outer end of the outlet tube extends out from the outlet hole of the centering member. The tube has one or more first casting holes at the outer end of the tube in the vicinity of the sealing device and one or more second casting holes at the inner end of the tube near the expansion member.

Abstract: The invention relates to an anchor head (1) for anchoring a tension anchor (2) on the air side of an anchor bore (5), comprising an anchor nut (3) with a threaded bore (17) for screwing onto an anchor thread (19) of a tension anchor (2) and comprising an anchor plate (4) which interacts with the anchor nut (3) and comprises an anchor plate opening (8), said anchor plate being designed to transmit the tensile forces which can be exerted onto the anchor nut (3) by a screwed-in tension anchor (2) to a sub-surface (6) surrounding the anchor bore (5). The anchor nut (3) has a conical bearing region (7) which engages into the opening (8) of the anchor plate (4) in the assembled state and rests against a complementary inner cone (9) in the anchor plate opening, said anchor plate (4) having the inner cone at least in the region of the anchor plate opening (8).

Abstract: An anchor socket system for vertically supporting a post includes external and internal, open-ended cylinders, wherein the external cylinder includes first and second semi-cylinder halves each having mirroring tapers and semi-annular upper rims on each respective inner facing wall. Tightening bolts in communication with the internal and external cylinders are rotated to raise the internal cylinder relative to the external cylinder, thereby causing tapered wedges on the outer facing surface of the internal cylinder to exert pressure against the corresponding tapers on the inner facing surface of the external cylinder. As the diameter of the internal cylinder contracts, pressure is exerted against a post by the inner facing walls of the internal cylinder while the outer facing walls of the external cylinder halves simultaneously exert pressure against the inner facing surface of a core-drilled hole, thereby locking the anchor socket and post into place within the core-drilled hole.

Abstract: A blind fastener adapter for a conventional screw-threaded nut and screw comprises a collar and a segmented ring over the collar, the ring and collar having a tapered interface wherein relative axial movement results in a change of diameter of the ring. The adapter further includes a spring adapted to bias the collar and ring into mutual engagement; the collar and ring include means to prevent substantial relative angular movement thereof. The collar is adapted for engagement by a blind side head of the screw in use, and the ring is adapted for blind side engagement of the perimeter of a hole.

Abstract: The present application relates to a system for supporting a roof of a portion of a mine. The system includes a first plurality of stabilizing members disposed above the roof at a first elevation. The first plurality of stabilizing members originate from a first common location and terminate at a second elevation that is higher than the first elevation. The system further includes a second plurality of stabilizing members disposed above the roof and the first plurality of stabilizing members at a third elevation. The second plurality of stabilizing members originate from a second common location and terminate at a fourth elevation that is higher than the third elevation. The second plurality of stabilizing members are disposed generally perpendicular to the first plurality of stabilizing members.

Abstract: The present invention concerns a tubular rock bolt (1) that can be expanded by a pressurised medium, for insertion into a drilled hole (16) and comprising an extended tubular part (2) with a closed cross-section (12) and provided with a longitudinal stamped part (13) that increases in diameter during the expansion of the rock bolt (1) without the periphery of the tubular part (2) being bent, and an end section (17) at one end (15) of the rock bolt (1) and an end piece (19) arranged at the second end (18) of the rock bolt (1) and provided with a connection part (22) for interaction in a manner that can be released with an expansion means (23). The extended tubular part (2) comprises a reinforcement means (3) that extends internally inside the tubular part (2) between the end section (17) and the end piece (19) and that is attached at the end section (17) and the end piece (19). The invention concerns also the manufacture of a rock bolt.

Abstract: A rock bolt to be installed into a borehole (1) drilled in a rock is described. The rock bolt includes wherein an expansion member (9) of the rock bolt includes an internal second cone abutment surface (12) in the interior of the expansion member in the vicinity of a second end thereof. A second cone member is at least partially fitted in the interior of the second end of the expansion member. The second cone member includes a hole (14), through which a drawbar is adapted to extend with a clearance, and a second cone surface (15) tapering inward relative to the expansion member and abutting against the second cone abutment surface (12) of the expansion member.

Abstract: A constant-resistance large-deformation anchor rod includes a rod body (6), a tray (3), a nut (2), and a constant-resistance device (4). The constant-resistance device (4) is formed into a cylindrical structure, and the inner surface of the constant-resistance device (4) and the outer surface of the rod body (6) are both formed with thread structures. The constant-resistance device (4) is sleeved at the tail of the rod body (6), and the tray (3) and the nut (2) are sequentially sleeved at the tail of the constant-resistance device (4). The nut (2) is in threaded connection with the constant-resistance device (4). The constant-resistance large-deformation anchor rod in the invention can be automatically stretched when the tunnel surrounding rock deforms largely, and keep the constant working resistance.

Abstract: A cable bolt includes a multi-strand cable segment constructed from steel wire strands, and a drive head. A compressible porous backer rod is placed along cable segment adjacent the drive head. A tubing portion provides a conduit for liquid grout injected under pressure into the bore hole. Tubing portion includes discharge holes that may be predrilled through the wall of the tubing portion. The holes provide a predetermined distribution path for the liquefied grout that is injected into the bore hole. Discharge holes may be evenly dispersed longitudinally along the wall, or distributed to provide a desired, unequal distribution of grout. Distribution holes may be larger at the top of the tubing, or may be distributed adjacent to the top of tubing portion to allow greater cross-sectional flow of grout from the tubing to compensate for factors that restrict grout flow nearer the top.

Abstract: A wedge anchor bolt having a screw member, a wedge member, and a cage member. The bolt is anchored into a drilled hole by wedging the wedge member in the end of the cage member by turning the screw member, with the result being that the wedge member becomes stuck in the cage member. For ejecting the wedge member from the cavity the screw member includes at least one of (1) one or more depressed portions, and (2) one or more projecting portions, defining a step, and the cage member includes one or more corresponding step-engaging portions for making an interference contact with the step, so that further withdrawal of the threads ceases to withdraw the threads relative to the cage member while continuing to withdraw the threads relative to the wedge member, thereby forcing the wedge member distally relative to the cavity.

Abstract: A rock bolt includes an elongate tubular body with an internal bore. A filler material is insertable into the internal bore at one end of the elongated tubular body. The end of the tubular body is then deformed thereby using the filler material to seal the end of the bore. The filler material may be a non-metallic material, such as a tube of plastic.

Abstract: A sleeve and a concentric shaft having head at one end with a rectangular plate through with the shaft interposed between the head and the adjacent end of the sleeve. The plate initially is substantially V-shape and has the apex substantially parallel to a minor axis of the plate so that movement of the sleeve along said shaft towards the head deforms the plate from the V-shape into a substantially plainer configuration with the ends of said plate on a major axis of the plate extending laterally beyond the head. The present invention also embraces a method of fixing the anchor in a bore hole with the ends of the plate in an undercut in the bore hole and filling the bore hole with resin while venting air via a passage extending from adjacent to a closed end of the bore hole through a suitable cover.

Abstract: A friction bolt, for frictionally engaging the internal surface of a bore drilled into a rock face. The friction bolt comprises an elongate, generally circular tube which is expandable radially. The tube has a leading end and a trailing end. An expander mechanism is disposed within the tube for applying a load tending to expand at least a section of the tube radially. An elongate tendon is disposed longitudinally within the tube and in connection at or towards one end of the tendon with the expander mechanism and in connection at or towards an opposite end of the tendon with an anchor arrangement. The tendon is actuatable to expand the expander mechanism and to remain connected between the expander mechanism and the anchor arrangement while the expander mechanism is expanded.

Abstract: The present invention concerns a tubular rock bolt (1) that can be expanded by a pressurised medium, for insertion into a drilled hole (16) and comprising an extended tubular part (2) with a closed cross-section (12) and provided with a longitudinal stamped part (13) that increases in diameter during the expansion of the rock bolt (1) without the periphery of the tubular part (2) being bent, and an end section (17) at one end (15) of the rock bolt (1) and an end piece (19) arranged at the second end (18) of the rock bolt (1) and provided with a connection part (22) for interaction in a manner that can be released with an expansion means (23). The extended tubular part (2) comprises a reinforcement means (3) that extends internally inside the tubular part (2) between the end section (17) and the end piece (19) and that is attached at the end section (17) and the end piece (19). The invention concerns also the manufacture of a rock bolt.

Abstract: A rock bolt component includes an elongate tubular section with an internal bore. A fixing member has an elongate body that includes a securing portion positionable in the internal bore of the tubular section and a coupling formation which projects from an opposite end of the fixing member. The fixing member is securable by deformation of an end of the tubular section, once the securing portion of the fixing member has been inserted into the end of the tubular section.

Abstract: A tube (1) of a friction bolt has an outer part (3) and an inner part (5) folded inward and a gap (7) extending in the longitudinal direction of the tube, at which gap the outer part transitions into the inner part. The lateral wall areas (9) of the inner part are flat and have a shape in which the free space between the outer and inner parts is substantially lenticular as in known tubes. The bottom (15) of the inner part lies against the outer part, and the weld (13) is arranged at a lateral offset from the plane of symmetry (11) as the area where the bottom lies against the outer part of the tube. Finally, the radii of curvature (R3) in the area of the transitions (4) from the outer part into the inner part of the tube are greater than in known tubes.

Abstract: The invention relates to a rock bolt to be installed into a borehole (1) drilled in a rock, wherein an expansion member (9) of the rock bolt includes an internal second cone abutment surface (12) in the interior of the expansion member in the vicinity of a second end (10) thereof. A second cone member (13) is at least partially fitted in the interior of the second end (10) of the expansion member (8). The second cone member includes a hole (14), through which a drawbar (2) is adapted to extend with a clearance, and a second cone surface (15) tapering inward relative to the expansion member and abutting against the second cone abutment surface (12) of the expansion member.

Abstract: A rock bolt is for use in stabilizing a rock face. The rock bolt comprises a body having a plurality of elongate lobes spaced apart by substantially resilient channel means. The rock bolt is further configured to receive expansion means for urging the lobes outwardly to thereby expand the rock bolt for improving a communication with a bore hole in the rock face. Following expansion the expansion means may be removable, the expansion means can comprise any suitably sized hollow or solid bar expansion member. The configuration of the present invention also enables, subsequent to an initial expansion, the resilient channel means to provide a gripping force on any suitably sized member inserted into the internal space. This feature of the rock bolt allows for a mesh plate having an elongate portion to be securely and removably fitted to the rock bolt after the rock bolt has been expanded.

Abstract: This invention relates to an anchoring device and more particularly but not exclusively, to a rock anchor for use in a mining environment, and which combines the functionality of a split set and an attachment anchor. The anchoring device includes a tubular body having a longitudinal slot provided therein, and an elongate anchoring element locatable inside the tubular body. The anchoring element is displaceable between a retracted position in which an end of the anchoring element is located inside the tubular body, and a protruding position, in which at least part of the elongate element protrudes from the tubular element.

Abstract: An anchor comprises an anchor bolt having a shaft and a bolt head, a spreading sleeve having spreading parts provided at a tip portion of a tubular body capable of being fitted on a tip portion of the shaft and a cone nut provided at its inner side a screw through hole to threadedly engage with the shaft. The shaft of the anchor bolt is composed of a thick shaft part connected to the bolt head, and a thin shaft part provided to be closer to the tip portion of the shaft. The thick shaft part is provided with a rupture portion reduced in diameter. The rupture portion is provided at a position spaced by a predetermined length from the step between the thick shaft part and the thin shaft part and ruptures if torque of a predetermined value acts on the bolt head.

Abstract: A rock bolt includes an elongate tubular body with an internal bore. A filler material is insertable into the internal bore at one end of the elongated tubular body. The end of the tubular body is then deformed thereby using the filler material to seal the end of the bore. The filler material may be a non-metallic material, such as a tube of plastic.

Abstract: A rock bolt includes an elongated tubular shank which has a defined outer diameter in which has a first end and a second end. A component is received on the first end of the elongate tubular shank and is fixed to the shank by welding. The component can be externally threaded and can be configured to be threadably engaged by a nut.

Abstract: A rock bolt including an elongate shaft, and an anchoring device attached to the shaft having an expansion mechanism. The anchoring device is operable to expand radially relative to the lengthwise extent of the shaft to anchor the rock bolt within a bore drilled into a rock body. The anchoring device includes an annular band, which extends about the expansion mechanism to resist expansion of the mechanism. The band is arranged so it can enter the bore in which the bolt is to be anchored in position about the expansion mechanism and to maintain a resistance to expansion of the expansion mechanism at least until the expansion mechanism has substantially fully entered the bore. The band can be a polymeric material such as a heat shrink polymeric material in tight fitting engagement about the expansion mechanism so as to conform to the external shape of the expansion mechanism.

Abstract: A constant-resistance large-deformation anchor rod includes a rod body (6), a tray (3), a nut (2), and a constant-resistance device (4). The constant-resistance device (4) is formed into a cylindrical structure, and the inner surface of the constant-resistance device (4) and the outer surface of the rod body (6) are both formed with thread structures. The constant-resistance device (4) is sleeved at the tail of the rod body (6), and the tray (3) and the nut (2) are sequentially sleeved at the tail of the constant-resistance device (4). The nut (2) is in threaded connection with the constant-resistance device (4). The constant-resistance large-deformation anchor rod in the invention can be automatically stretched when the tunnel surrounding rock deforms largely, and keep the constant working resistance.

Abstract: A tube (1) of a friction bolt has an outer part (3) and an inner part (5) folded inward and a gap (7) extending in the longitudinal direction of the tube, at which gap the outer part transitions into the inner part. The lateral wall areas (9) of the inner part are flat and have a shape in which the free space between the outer and inner parts is substantially lenticular as in known tubes. The bottom (15) of the inner part lies against the outer part, and the weld (13) is arranged at a lateral offset from the plane of symmetry (11) as the area where the bottom lies against the outer part of the tube. Finally, the radii of curvature (R3) in the area of the transitions (4) from the outer part into the inner part of the tube are greater than in known tubes.

Abstract: A rock bolt, particularly for use in mining, having an axial conduit, an anchor nut, and an anchor plate supported by the anchor nut for the purpose of placement on the rock, that is able to expand sufficiently and possess sufficient tensile strength, and also is able to be cut for the purpose of simplified separation of excavated pieces of the rock bolt. This problem is addressed in that the axial conduit is at least partially, and particularly entirely, made of metal and plastic, and the at least one component of the axial conduit made of metal and plastic serves to receive tensile forces.

Abstract: A friction bolt, for frictionally engaging the internal surface of a bore drilled into a rock face. The friction bolt comprises an elongate, generally circular tube which is expandable radially. The tube has a leading end and a trailing end. An expander mechanism is disposed within the tube for applying a load tending to expand at least a section of the tube radially. An elongate tendon is disposed longitudinally within the tube and in connection at or towards one end of the tendon with the expander mechanism and in connection at or towards an opposite end of the tendon with an anchor arrangement. The tendon is actuatable to expand the expander mechanism and to remain connected between the expander mechanism and the anchor arrangement while the expander mechanism is expanded.

Abstract: After a rock anchor (1), in particular an expandable friction tube anchor (1), comprising an anchor bolt (2) has been inserted into a pre-sunk borehole with an end sleeve (4) first, an adapter (6) having a liquid inflow and outflow is arranged on a sleeve (3). On the one hand, a holding pressure which secures the adapter (6) to the sleeve (3) is produced via a holding-pressure line (8). On the other hand, fluid flows into the anchor bolt (2) via an expansion line (7) and starts to fill said bolt. In the process, the increase in pressure (inflation pressure) causes the anchor bolt (2) to expand in the borehole, with the result that its outer surface presses against the borehole wall and thus secures the rock anchor (1) in the borehole. A gas supply connected to the adapter (6) makes it possible for a gas under pressure, in particular compressed air, to be introduced into the anchor bolt (2) before and/or after the expansion thereof.

Abstract: The invention relates to a device (D) for locking/unlocking to the ground (S) of a connecting plate (100) to the ground or to the rim of a basin of a roof element, the plate (100) being on the one hand connected to the rim of the roof element and on the other hand connected to the ground (S) or to the basin rim, the plate (100) being pierced with an orifice (121) coming opposite a hole (200) made in the ground, the locking/unlocking device interacting with the hole (200) made in the ground and resting on the plate (100) for the purpose of attaching the latter. This device is noteworthy in that it comprises an expandable bush (300) changing from a volume called a rest volume allowing it to be inserted into the hole (200) made in the ground to a volume called the expanded volume ensuring its adhesion to the walls (210) of the said hole (200). Applications: attaching swimming pool shelters.

Abstract: The invention relates to a rock anchor including an elongate, hydraulically inflatable anchor tube made of a ductile material and defining a closed leading end, a trailing end, and a tube cavity extending between the ends. The rock anchor of the invention includes an end cap on a trailing end of the tube, defining a feed aperture in communication with the tube cavity for pressure feeding a liquid substance into the tube cavity for inflating the tube. The end cap includes pressure indicator means configured for indicating when, as a result of pressure feeding of a liquid substance into the tube cavity, a predetermined installation pressure is reached in the tube cavity. The pressure indicator means typically includes a pressure indicator formation displaceable under pressure in the tube cavity, with such displacement being visible from the outside of the end cap.

Abstract: A friction bolt assembly (1) comprises a friction bolt (2) with a pre-formed elongate column (3) of flexible, solid material retained within, and extending along a cavity (4) defined by the body (5) of the friction bolt (2). The body (5) of the friction bolt (2) is generally cylindrical and has a split (6) extending along its length.