COMPOSITE DEFORMABLE ROCK ANCHOR WITH IMPROVED RANGE OF DEFORMATIONS Russian patent published in 2020 - IPC E21D21/00 

FIELD: mining.

SUBSTANCE: invention relates to anchors, namely, to deformable rock anchor used for fixing of mine working roof and walls. Deformable rock anchor comprises composite elongated tensile element extending longitudinally along its axis A from proximal end to distal end, and comprises a substantially non-deformable rigid first anchor portion located at or near the distal end and extending towards the proximal end, and at least one plastically longitudinally deformable portion located between the non-deformable rigid first anchor portion and the proximal end. Both the first anchor part and said at least one deformable part are hollow rod elements, and the first anchor part and said at least one deformable part are connected to each other permanently end to end by welding or gluing to form at least part of elongated stressed member. Ranges of strength tolerances of any substantially non-deforming rigid anchor part and said at least one plastically longitudinally deformable portion are not overlapped, and said at least one longitudinally deformable portion has a strain range of at least 100 mm/m, preferably of at least 120 mm/m and most preferably of at least 150 mm/m.

EFFECT: technical result consists in improvement of counteraction to certain dynamic loads, enabling creation of improved deformable rock anchor, which can be easily adapted to specific requirements, creation of improved deformed rock anchor, which is easy to use and cheaper in production, creation of improved deformable rock anchor, which provides possibility of considerably greater deformation, before it is destroyed.

12 cl, 3 dwg