Abstract: An anchor includes a rotatable anchor rod an anchor plate and an anchor nut. The screw thread in the anchor nut matches the screw thread of the anchor rod only over part of the screw thread hole. Thus the anchor nut can only be screwed some way further onto the anchor rod, and up to a predetermined torque can be used for rotating the anchor rod during placement of the anchor. As soon as the anchor rod is firmly seated in the drill hole, as a result of the action of adhesive, mortar or expansion or spreading, the anchor rod forms a through-thread in the screw thread hole when the anchor nut is rotated relative to the anchor rod, and consequently the anchor nut can finally be screwed onto the anchor rod until it affixes the anchor plate in its final position to the ground.

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 sliding bolt (10) for introducing into a bore, having an anchor rod (12), on which is disposed a sliding control element (14) with a through-opening (18), through which the anchor rod (12) extends, wherein the sliding control element (14) comprises a sliding body cage (16) having at least one recess (20) for receiving a sliding body (22) that is in contact with the lateral surface of the anchor rod (12), and having an anchor plate (24), which is intended to lie against a region surrounding the mouth of the bore once the sliding bolt (10) has been introduced into the bore. In contrast to conventional sliding bolts, the anchor plate (24) is in load-transferring connection with the sliding body cage (16), with the result that it is easily possible to provide a device that indicates a sliding path of the sliding bolt that is still available.

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: 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 sliding anchor bolt (10) for introduction into a bore. The sliding anchor bolt (10) has a anchor bolt rod (12), disposed on which is a sliding control element (14) having a through-opening (18), through which the anchor bolt rod (12) extends. The sliding control element (14) comprises a sliding body cage (16) having at least one recess (20) for receiving a sliding body (22) that is in contact with the lateral surface of the anchor bolt rod (12). For precise and repeatable setting of a predefined breakaway force, each recess (22) for receiving a sliding body (22) is disposed in the sliding body cage (22) tangentially relative to the lateral surface of the anchor bolt rod (12). Furthermore, the lateral enveloping surface of each recess (20) projects by a predefined dimension into the free cross section of the through-opening (18), and each sliding body (22) fills the cross section of the recess (20) associated with it.

Abstract: An adjustable yield rock bolt that comprises an elongated tensile support member that interacts with at least one gouging member and a receiving member capable of receiving the elongated tensile support member and hold the gouging member segment there between, wherein the elongated tensile support member extends beyond the receiving member a length that corresponds to a predetermined amount of yield before ultimate failure. The bolt has adjustability by allowing for controlled yield by gouging of the elongated tensile support member for any length of displacement.

Abstract: A friction tube anchor has a tube (1) which can be expanded under the action of a pressurized medium and which is attached to a casing (6). The casing (6) is screwed into a section (13) of a casing-like sleeve (7) which is provided with a thread and is sealed by ring packing (11) relative to the inside of the section (13). The casing-like sleeve (7) has another section (14) which is provided with a thread and in which selectively either another expandable tube (1), or an adapter for feeding the pressurized medium for expanding the tube (1), or a fastening bolt, for example an eye bolt, can be screwed.

Abstract: The invention relates to a sliding bolt (10) for introducing into a bore, having an anchor rod (12), on which is disposed a sliding control element (14) with a through-opening (18), through which the anchor rod (12) extends, wherein the sliding control element (14) comprises a sliding body cage (16) having at least one recess (20) for receiving a sliding body (22) that is in contact with the lateral surface of the anchor rod (12), and having an anchor plate (24), which is intended to lie against a region surrounding the mouth of the bore once the sliding bolt (10) has been introduced into the bore. In contrast to conventional sliding bolts, the anchor plate (24) is in load-transferring connection with the sliding body cage (16), with the result that it is easily possible to provide a device that indicates a sliding path of the sliding bolt that is still available.

Abstract: After a rock anchor which encompasses the anchor bolt, has been inserted with an end sleeve beforehand into a bore hole, on the sleeve there is an adapter with liquid supply and drain. Via the holding pressure line a holding pressure is produced which fixes the adapter on the sleeve. Via the expansion line fluid flows into the anchor bolt and begins to fill it. The anchor bolt expands as a result of the pressure increase in the bore hole, so that its outer surface adjoins the bore hole wall and fixes the rock anchor in the bore hole. Via a gas supply connected to the adapter, a pressurized gas, before and/or after expanding the anchor bolt, can be introduced into the latter. The compressed gas is relieved after removing the adapter and routs the fluid located in the anchor bolt almost completely out of the anchor.

Abstract: An anchor includes a rotatable anchor rod an anchor plate and an anchor nut. The screw thread in the anchor nut matches the screw thread of the anchor rod only over part of the screw thread hole. Thus the anchor nut can only be screwed some way further onto the anchor rod, and up to a predetermined torque can be used for rotating the anchor rod during placement of the anchor. As soon as the anchor rod is firmly seated in the drill hole, as a result of the action of adhesive, mortar or expansion or spreading, the anchor rod forms a through-thread in the screw thread hole when the anchor nut is rotated relative to the anchor rod, and consequently the anchor nut can finally be screwed onto the anchor rod until it affixes the anchor plate in its final position to the ground.

Abstract: The invention relates to a sliding anchor bolt (10) for introduction into a bore. The sliding anchor bolt (10) has a anchor bolt rod (12), disposed on which is a sliding control element (14) having a through-opening (18), through which the anchor bolt rod (12) extends. The sliding control element (14) comprises a sliding body cage (16) having at least one recess (20) for receiving a sliding body (22) that is in contact with the lateral surface of the anchor bolt rod (12). For precise and repeatable setting of a predefined breakaway force, each recess (22) for receiving a sliding body (22) is disposed in the sliding body cage (22) tangentially relative to the lateral surface of the anchor bolt rod (12). Furthermore, the lateral enveloping surface of each recess (20) projects by a predefined dimension into the free cross section of the through-opening (18), and each sliding body (22) fills the cross section of the recess (20) associated with it.

Abstract: A coupling for anchor bolts, includes a sleeve having an internal screw thread and two anchor pipes having an external screw thread, the ends of the pipes being screwed into the sleeve. The sleeve is provided with an annular rib in the longitudinal centre thereof, the rib having a cylindrical inner end surface. The ends of the anchor pipes sealingly engage in the annular rib, and have cylindrical thread-free circumferential surfaces. In order to improve the tightness of the coupling and ensure that the transfer of impact energy from the first anchor pipe to the second anchor pipe does not engender much loss, the annular front surfaces of the anchor pipes are sealingly arranged against each other in the annular rib region. A leak-free coupling for anchor bolts which prevents the discharge of rinsing medium and/or setting mass is provided.

Abstract: A drill bit has, on its face, a combination of at least one straight cutting edge and at least two curved cutting edges arranged in a Y-shape. The cutting edges on the face of the drill bit are arranged such that they start from the axis of the drill bit or end directly adjacent thereto. The straight cutting edge is symmetrical with respect to the curved cutting edges, which are curved in opposite directions.

Abstract: An adjustable yield rock bolt that comprises an elongated tensile support member that interacts with at least one gouging member and a receiving member capable of receiving the elongated tensile support member and hold the gouging member segment there between, wherein the elongated tensile support member extends beyond the receiving member a length that corresponds to a predetermined amount of yield before ultimate failure. The bolt has adjustability by allowing for controlled yield by gouging of the elongated tensile support member for any length of displacement.

Abstract: A drill bit comprises, on its face, either only curved cutting edges or a combination consisting of at least one straight cutting edge and at least two curved cutting edges. The cutting edges on the face of the drill bit are arranged such that they start from the axis of the drill bit or end directly adjacent thereto. Three channels start from a blind hole serving to attach the drill bit to an anchor rod of an injection boring anchor, and their openings are not located in the area of the face of the drill bit but are situated in the area of the lateral surface of the same, said lateral surface conically expanding toward the cutting edges. The openings of the channels are placed in the area of concave recesses of the lateral surface of the drill bit in such a manner that they are recessed with regard to the periphery of the face of the drill bit.

Abstract: An anchoring rod for rock anchoring (self-drilling injection bolts), includes an outer thread for connecting the anchoring rod to a drilling tool via a coupling sleeve. The end of the anchoring rod, which is screwed into the coupling sleeve, comprises a section which has a reduced diameter in comparison with the outer diameter of the anchoring rod. The free end of the section of the anchoring rod with the reduced diameter comprises a bevel. An open space is thus formed between the inner surface of the coupling sleeve and the reduced diameter end of the anchoring rod. The space stops the anchoring rod from becoming stuck in the coupling sleeve, even when the end of the rod is plastically deformed during the drilling process, so that the anchoring rod can be unscrewed from the coupling sleeve without applying significant force.

Abstract: A drill bit comprises, on its face, either only curved cutting edges or a combination consisting of at least one straight cutting edge and at least two curved cutting edges. The cutting edges on the face of the drill bit are arranged such that they start from the axis of the drill bit or end directly adjacent thereto. Three channels start from a blind hole serving to attach the drill bit to an anchor rod of an injection boring anchor, and their openings are not located in the area of the face of the drill bit but are situated in the area of the lateral surface of the same, said lateral surface conically expanding toward the cutting edges. The openings of the channels are placed in the area of concave recesses of the lateral surface of the drill bit in such a manner that they are recessed with regard to the periphery of the face of the drill bit.