4VAC25-40-2890. Torque test requirements.
When installing point-anchor rock bolts:
1. A torque test shall be conducted on at least every fourth installed bolt;
2. Torque testing shall be conducted immediately after bolt installation;
3. If the recommended torque has not been achieved, the equipment used to install the bolt shall be adjusted and the next bolt installed shall then be tested; and
4. If the recommended torque has not been achieved on the majority of bolts installed in a working place through equipment adjustment, supplemental support equivalent to longer roof bolts with adequate anchorage, steel or wood sets, or cribs shall be installed.
Statutory Authority
§§ 45.1-161.3 and 45.1-161.294 of the Code of Virginia.
Historical Notes
Derived from VR480-05-1.2 § 15.13, eff. July 19, 1989.