Patent ID: 8137032

Claim:
An anchor for consolidating non-cohesive rock layers which anchor comprises: an anchor bar with a rock end, a thread, anchor nut and domed plate arranged at opposite bar end, and a sheathing tube surrounding the anchor bar at a distance therefrom and extending roughly as far as the rock end, which sheathing tube may be filled from the bar end with grout bonding material to such an extent that a cavity between the anchor bar and the inner side of the sheathing tube and also a jacket space between the outer wall and the drill hole wall are filled with the grout bonding material, wherein the bar end is provided with a connecting tube comprising an external thread for the anchor nut and a distributor head extending into the drill hole in the rock, which distributor head is constructed with a connection to the anchor bar and to the sheathing tube as well as with radial bores extending as far as an internal channel, and wherein the internal channel is constructed so as to determine a sealing surface relative to the anchor bar at a point of transition to an internal thread.