Abstract

In order to protect the coating that protects a bolt (2) against corrosion when the bolt (2) is inserted into a pre-bored hole, a protective device (1) is placed on the leading end of the bolt (2) to be introduced first into the bore. The protective device (1) comprises a sleeve (3), which is seated on the bolt (2) with a friction fit, and a plate (4), which engages the mouth of the bore or a steel mesh (11) provided there as the bolt (2) is inserted. The outer face of the bolt (2), on which the anti-corrosion coating is provided, is protected in this manner against touching the mouth of the bore or the steel mesh (11) provided there and cannot be damaged when the bolt (2) is inserted.

IPC Classes  ?

• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

Abstract

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

IPC Classes  ?

• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

Abstract

The invention relates to a sliding anchor (10) for inserting in a borehole. The sliding anchor (10) has an anchor rod (12) on which is arranged a sliding control element (14) with a through opening (18) through which the anchor rod (12) extends. The sliding control element (14) has a sliding body cage (16) with at least one cut-out (20) for accommodating a sliding body (22) which is in contact with the outer surface of the anchor rod (12) and an anchor plate (24), for making contact with a region around the mouth of the drilling when the sliding anchor (10) is intr4oduced into the drilling. In contrast to conventional sliding anchors the anchor plate (24) is in a force transmitting connection with the sliding body cage (16), wherein it is simple to provide a device which results in a further available sliding path for the sliding anchor.

IPC Classes  ?

• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

Abstract

An anchor has an anchor rod (3) which must be rotated during the setting of the anchor, an anchor plate (4), and an anchor nut (1). The screw thread in the anchor nut (1) matches the screw thread of the anchor rod (3) only for part of the threaded bore (13). Thus the anchor nut (1) can be screwed only a little further on the anchor rod (3) and can be used to rotate said rod during the setting of the anchor up to a specific torque. As soon as the anchor rod (3) fits tightly in the bore hole by means of cementing, mortar, or expansion, the anchor rod (3) forms a continuous thread in the threaded bore (13) when the anchor nut (1) is rotated relative to the anchor rod (3), such that the anchor nut (1) can be screwed finally so far down on the anchor rod (3) that said anchor nut fixes the anchor plate (4) in the final position on the substrate (7).

IPC Classes  ?

• F16B 13/14 - Non-metallic plugs or sleevesUse of liquid, loose solid or kneadable material therefor
• F16B 31/02 - Screwed connections specially modified in view of tensile loadBreak-bolts for indicating or limiting tensile load

Abstract

On a tie bolt (2) which is to be fixed in a drill hole by adhesive or mortar, teeth (6) which protrude from the end face (4) of the tie bolt (2) in its axial direction are provided on a mixing element (3) on the front end of said tie bolt (2) which is received in the drill hole. The teeth (6) ensure firstly that the film tubes of a cartridge which accommodate components of a two-component synthetic resin adhesive or of a mortar cartridge are opened reliably. Furthermore, the teeth (6) ensure that the components of the adhesive are mixed intimately with one another. Finally, the teeth (6) ensure that the film tubes of the cartridge are comminuted, with the result that there is no risk of remnants of the film tubes being wound around the front end of the tie bolt (2) and impairing the adhesive bond.

IPC Classes  ?

• F16B 13/14 - Non-metallic plugs or sleevesUse of liquid, loose solid or kneadable material therefor

Abstract

The invention relates to a sliding anchor (10) for inserting in a borehole. The sliding anchor (10) has an anchor rod (12) on which is arranged a sliding control element (14) with a through opening (18) through which the anchor rod (12) extends. The sliding control element (14) comprises a sliding body cage (16) which has at least one cutout (20) for accommodating a sliding body (22) which is in contact with the outer surface of the anchor rod (12). In order to set a predefined breakaway force in a precise and accurately reproducible manner, each cutout (20) is arranged tangentially to the outer surface of the anchor rod (12) for the purpose of accommodating a sliding body (22) in the sliding body cage (16). Furthermore, the outer enveloping surface of each cutout (20) protrudes by a predefined amount into the free cross section of the through opening (18), and each sliding body (22) completely fills the cross section of the cutout (20) associated therewith.

IPC Classes  ?

• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

Abstract

To protect anchors from corrosion due to aggressive waters underground, the anchor (1) is assigned a sacrificial anode (6) connected thereto in an electrically conducting manner. In the case of tubular friction bolts, this sacrificial anode (6) may be a rod or a tube which is accommodated in the omega-like fold (9) of the tube (1). In the case of drilling anchors, the sacrificial anode (6) may be a sleeve in the form of a socket which is screwed onto the outer thread of anchor bars/anchor tubes (10).

IPC Classes  ?

• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

Abstract

A friction bolt comprises a tube (1) which can be expanded under the action of a pressure medium and which is fastened to a sleeve (6). The sleeve (6) is screwed into a section (13) of a sleeve-like socket (7) that is provided with a thread and sealed with respect to the inside of the section (13) by means of a ring seal (11). The sleeve-like socket (7) comprises a further section (14) provided with a thread, into which section can be selectively screwed a further expandable tube (1), or an adaptor for feeding in the pressure medium to expand the tube (1), or an anchor bolt, for example an eyebolt.

IPC Classes  ?

• E02D 5/76 - Anchorings for bulkheads or sections thereof
• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

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. The compressed gas is relieved following the removal of the adapter (6) (pressure equalization) and conveys the fluid contained in the anchor bolt (2) virtually completely from the anchor (1).

IPC Classes  ?

• E21D 21/00 - Anchoring-bolts for roof, floor, or shaft-lining protection

Abstract

Anchors, especially injection drilling anchors, are used as heat exchangers in combination with heat pumps in order to deliver heat to the ground (heat storage, optionally in combination with air-conditioning a building) or withdraw heat from the ground (heat pump heating), wherefore at least one pipe (8) for feeding a heat transfer medium is introduced into the tube (4) of the anchor. The heat transfer medium flows back through the space between the pipe and the anchor tube (4) while exchanging heat with the environment. In an alternative embodiment, a supply pipe and a discharge pipe (forward flow, return flow) for the heat transfer medium can be accommodated in the anchor tube. The inventive embodiment of the heat exchanger has the advantage of meeting two objectives, i.e. exchanging heat and securing country or ground for the anchor.

IPC Classes  ?

• F24J 3/08 - using geothermal heat (devices for producing mechanical power from geothermal energy F03G 4/00)
• F28D 20/00 - Heat storage plants or apparatus in generalRegenerative heat-exchange apparatus not covered by groups or