| 摘要 |
FIELD: mining.SUBSTANCE: yielding rock bolting comprises an anchor mounted in the mass with an outer threaded end, an upper support element and a deformable element fixed by the lower support element. On the exposed end of the rod of the anchor the tube is installed which is perforated in the lower belt, which is fixed by the lower support element.EFFECT: ensuring of compliance of the rock bolting with the relatively constant resistance.4 dwg |
