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Rock bolting
| Details |
Inventors: Norris, Colin;
Assignee: The Titan Manufacturing Co. Pty. Ltd. (New South Wales, AU)
Primary Examiner: Husar; Cornelius J.
Assistant Examiner: Stodola; Nancy J.
Attorney, Agent or Firm: Murray and Whisenhunt
A rock bolt assembly incorporating a friction reducing washer of plastics material between the nut and the plate washer to give an increased tension in the bolt for a given torque. |
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DETAILED DESCRIPTION What I claim is: 1.
In a method of reinforcing a rock face with at least one rock bolt, said method comprising: drilling a hole in the rock face, inserting a rock bolt having at least one threaded end into the hole so that a threaded free end thereof protrudes from the hole, anchoring the other end of the rock bolt into the hole, placing a plate washer over the threaded free end of the bolt, engaging a nut with the threaded free end, and tightening the nut to force the plate washer against the rock face to induce a tension in the rock bolt, the improvement comprising: reducing the coefficient of friction between the plate washer and the nut by placing a friction-reducing disc over the free end of the rock bolt before the nut is engaged therewith, so that the friction-reducing disc is located between the plate washer and the nut, wherein the friction-reducing disc is made of a material having a lower coefficient of friction with at least one of the plate washer and the nut than the coefficient of friction between the plate washer and the nut.
2.
Method of claim 1, wherein the tension (in thousands of pounds) to torque (in foot-pounds) ratio is generally at least 70.
3.
Method of claim 2, wherein said ratio is about 70 to about 80.
4.
Method of claim 1, wherein the nut tightening efficiency is improved by a factor of at least two over the rock bolt assembly with nothing between the plate washer and the nut.
5.
Method of claim 1, wherein said friction-reducing disc is made of a plastics material.
6.
Method of claim 5, wherein said friction-reducing disc is made of a member selected from the group consisting of polypropylene and polyethylene.
7.
Method of claim 1, wherein said friction-reducing disc is in shape of a substantially planar disc.
8.
A rock bolt assembly comprising a rock bolt having one end adapted to be anchored in a hole drilled in a rock face and the other end threaded, a plate washer having a hole therethrough sized to fit over the threaded end of the rock bolt, a nut adapted to engage the threaded end of the rock bolt, and a friction-reducing disc means adapted to be placed between the plate washer and the nut for reducing the coefficient of friction between the plate washer and the nut by being of the material having a lower coefficient of friction with at least one of the plate washer and the nut than the coefficient of friction between the plate washer and the nut
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