Anchor, especially a rock anchor

Abstract

An anchor fitted with a self-tapping thread and an anchor rod, whereby at least one axially oriented feed channel for a curable compound is arranged in the anchor rod. A head element on which the self-tapping thread is arranged is fastened to a first end of the anchor rod.

Claims

1. An anchor comprising: an anchor tube having at least one axially oriented feed channel for a curable compound; a head element fastened to a first end of the anchor tube; and a self-tapping thread arranged on the head element; the head element closing off the at least one axially-oriented feed channel wherein the anchor tube is provided with at least one radial outlet bore leading from the feed channel to an outside of the anchor tube.

2. The anchor as recited in claim 1 wherein a core diameter of the self-tapping thread arranged on the head element is greater than a diameter of the anchor tube.

3. The anchor as recited in claim 1 wherein the feed channel and the self-tapping thread are at an axial distance from each other.

4. The anchor as recited in claim 1 wherein the anchor tube is provided with at least one radial outlet bore leading from the feed channel to an outside of the anchor tube.

5. The anchor as recited in claim 1 wherein the feed channel is closed off by the head element.

6. The anchor as recited in claim 1 wherein the anchor tube and the head element are joined by a welded connection.

7. The anchor as recited in claim 6 wherein the welded connection is a frictional welded connection.

8. The anchor as recited in claim 1 wherein the head element is solid.

9. The anchor as recited in claim 1 further comprising an anchor nut arranged on an end section of the anchor tube facing away from the first end.

10. The anchor as recited in claim 1 wherein the at least one radial outlet bore is a single radial outlet bore in the anchor tube before the first end.

11. A method for inserting the anchor as recited in claim 1 comprising accommodating the anchor in a hole drilled in rock.

12. The method as recited in claim 11 further comprising screwing the self-tapping thread of the head element into the rock and surrounding the anchor rod with a cured compound.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) The invention will be described in greater detail below making reference to a preferred embodiment that is schematically depicted in the accompanying FIGURE. The following is shown schematically:

(2) FIG. 1: a side view of an anchor according to the invention, in a hole drilled in the rock, whereby the rock that surrounds the drilled hole is shown in a cutout view.

DETAILED DESCRIPTION OF THE INVENTION

(3) One embodiment of an anchor according to the invention is shown in FIG. 1. The anchor is arranged in a hole 91 that has been drilled into the rock 90. The anchor has an approximately cylindrical anchor rod 10 on whose first end 31on the drilled hole sidea head element 20 is fastened. The anchor rod 10 and the head element 20 are joined by means of a frictional welded connection 26 so as to abut with each other.

(4) On the outside of the cylindrical head element 20, there is a self-tapping external thread 21. The thread 21 has an outer diameter d.sub.a that is greater than the inner diameter d.sub.h of the drilled hole 91, that is to say, the thread 21 is cut into the rock 90 that surrounds the drilled hole 91.

(5) The core diameter d.sub.k of the thread 21, which is defined by the circumferential surface of the cylindrical head element 20, is greater than the outer diameter d.sub.t of the anchor rod 10. A ring-shaped step 24 is formed at the transition site between the anchor rod 10, whose diameter is smaller, and the head element 20, whose diameter is greater.

(6) Since the outer diameter d.sub.t of the anchor rod 10 in the drilled hole 91 is smaller than the inner diameter d.sub.h of the drilled hole 91, the anchor rod 10 in the drilled hole 91 is surrounded by a ring-shaped space 96. This ring-shaped space 96 can be filled with a curable compound in order to additionally secure the anchor, whereby the curable compound can especially be introduced after the anchor has been pre-tensioned in the drilled hole 91. For purposes of introducing the curable compound into the ring-shaped space 96, the inside of the anchor rod 10 configured as an anchor tube has a feed channel 15 that runs axially, in other words, in the lengthwise direction of the anchor rod 10, said feed channel 15 being indicated by the broken lines in the FIGURE. Opening into this feed channel 15, there is at least one radial outlet bore 16 that is provided in the area of the first end 31 of the anchor rod 10 and that leads to the outside of the anchor rod 10.

(7) The end section 32 of the anchor rod 10 faces the outside and is opposite from the first end 31 of the anchor rod 10, the latter being provided with an external thread on which an anchor nut 40 is arranged.