How often is a torque check required when installing tensioned roof bolts?

The requirement for conducting a torque check on tensioned roof bolts is designed to ensure that each bolt is properly installed with the correct tension for safety and structural integrity. By only requiring torque checks on the first bolt installed and then on every fourth bolt thereafter, the regulation aims to maintain efficiency while still ensuring that the installation practices consistently meet safety standards.

Checking the torque of the first bolt establishes a baseline for tensioning that can be applied to subsequent bolts. Monitoring every fourth bolt afterward helps verify that the tension remains consistent throughout the installation process, reducing the workload on mine operators while ensuring that quality and safety are not compromised. This method offers a balance between thoroughness and practicality in mine operations, thus enhancing both safety and productivity.

Other options may suggest more frequent checks, which could be unnecessarily time-consuming and could lead to diminished efficiency in the operation. Alternatively, checks after large intervals might not provide adequate assurance of bolt performance.