Patent ID: 9062547
Filing Date: 2015-06-23
Classification: E21D,Y10T

Abstract:
1. A rock bolt comprising: an expandable tube that is partially collapsed upon itself so as to form a longitudinally extending depression between two longitudinally extending interior passageways, wherein the longitudinally extending depression forms a temporary main passageway at a distal end of the expandable tube, wherein the two longitudinally extending interior passageways form the interior of the tube upon expansion, wherein the temporary main passageway is open at the distal end of the expandable tube, and wherein the two longitudinally extending interior passageways are closed at the distal end of the expandable tube, wherein a pressurized fluid may be delivered into the two interior passageways to force the depression outward to thereby expand the expandable tube and compress the expandable tube against surrounding rock; an end fitting attached to the distal end of the expandable tube, the end fitting extending longitudinally beyond the closed distal ends of the interior passageways; and a spherical plug covering the temporary main passageway, wherein the spherical plug is affixed to the end fitting.