perforated hylsformigt bodies for anvendande at so-called bergfestning by means of borrhal fused bolt

摘要

The present invention relates to an apertured sleeve-shaped member made from a relatively rigid but resilient material and provided with a longitudinal slit which permits the diameter of the member to be varied by compression. The sleeve-shaped mamber is adapted to be filled with cement mortar and used in roof-bolting for insertion into bore holes of different diameter.