Torque Transmission through Rock Bolts.
Abstract
A laboratory testing program was undertaken to determine the effectiveness of a 1000-ft-lb impact wrench in transmitting torque to the anchor shells of various lengths of rock bolts. The investigation was limited to testing of one impact wrench on 2-, 4-, 6-, 8-, 10-, 12-, 16-, and 24-ft-length rock bolts. Results of torque tests indicated that transmitted torque generally decreases with increasing bolt length according to the equation: T = square root of (C/L) where c is a constant dependent upon bolt size and configuration and upon the type of impact wrench used. It was recommended that impact wrenches to be used for torquing rock bolts be proof tested in the laboratory and in the field before acceptance. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1977
- Accession Number
- ADA039838
Entities
People
- George H. Bragg Jr