Patent ID: 8142109

Claim:
A corrosion-protected, self-drilling anchor configured to be arranged within a borehole, comprising: a plurality of anchor subunits, each having a hollow bar element that are connectable together by an axial bell butt joint to form a connected pull and pressure member, wherein a first subunit has a drill bit and a last subunit is connectable non-rotatably to a drilling and injection device, wherein each hollow bar element is surrounded by a sheathing except for its end sections and an annular gap between the sheathing, and wherein the hollow bar element is grouted with a first corrosion protection compound; and a coupler provided in an area of the bell butt joint that fits tightly against the sheathings of the two hollow bar elements that are part of the bell butt joint, wherein a hollow space between the coupler and hollow bar elements is filled with a second corrosion protection compound.