Abstract: To secure roadways and wall surfaces of open cuts and tunnels, a rock anchor assembly is inserted into and secured within a borehole in a receiving material. The rock anchor assembly is made up of an axially elongated tension member laterally enclosed in part by an axially elongated sheathing tube so that the tension member projects outwardly from the opposite ends of the sheathing tube. In the insertion direction, the leading end of the sheathing tube is secured in tension-resistant locked engagement with the tension member. Initially, a hardenable adhesive material is injected into a borehole and then the assembled tension member and sheathing tube are inserted into the adhesive material so that the unsheathed end of the tension member is anchored in the base of the borehole. The trailing end of the sheathing tube has a flange which bears against a anchor plate in contact with the surface of the receiving material in which the borehole is formed.