Mine roof bolting

An anchoring means for use in conjunction with a roof bolt plate in supporting the roof of a mine, comprising:

• a bolt comprising a shank having a screw thread at only one end thereof extending from adjacent the respective end of the shank for a short distance relative to the length of the shank, a pattern of ridges thereon extending from adjacent the inner end of the screw thread to adjacent the other end of the shank, and a head at said one end of the shank projecting radially outwardly beyond the screw thread and
• a nut threaded on the screw thread on the bolt having a recess in its outer face toward the head of the bolt adapted to receive the head therein, and an integral flange at its inner face away from the head of the bolt, the roof bolt plate bearing on the inner face of the flange,
• the nut being rotatable relative to the bolt in one direction to move the nut along the bolt away from the head and the nut being rotatable relative to the bolt in the other direction to move the nut along the bolt toward the head until the nut engages the head with the head received in the recess in the nut, at which point the nut cannot be rotated further relative to the bolt in said other direction so that the application of any torque tending to rotate the nut in said other direction will tend to rotate the nut and the bolt together in said other direction,
• whereby the nut may be turned in said other direction to turn the bolt for mixing resin grouting material in a bore in the roof and, after the material has set, turned in said one direction to move the roof bolt plate carried on the flange of the nut into pressurized engagement with the roof for supporting the roof.