Anchor with grout jacket

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.