ROCK BOLT TO BE EMBEDDED IN A FIXING MATERIAL, IN A BORE HOLE

摘要

The present invention concerns a rock bolt (1) to be embedded in a borehole (2), comprising an extended energy-absorbing part (4), the first end (11) of the energy-absorbing part (4) comprising an anchor (12) and the second end (15) of the energy-absorbing part (4) comprising a screw joint (16) for prestressing of the rock bolt (1). The rock bolt (1) comprises an extended tubular part (3) with a jacket (7) and a first end section (5) and a second end section (6), with an internal dimension that is larger than the external dimension of the energy-absorbing part (4) and arranged in such a manner that it surrounds the energy- absorbing part (4). The invention concerns also a method for the manufacture of such a rock bolt.