The steel strand used for cable bolting has a breaking force about three times higher than rebar steel and offers major benefits over long rebar bolts.
In this way cable bolting raises productivity and efficiency, reduces cut-off grades and cuts waste rock dilution and ore losses.
Though the above indicates that bolting
is still an art, hydraulic torque wrenches are 30% more accurate than mechanical torque multipliers, air tools, electric nut runners and other more traditional torquing technologies.
Standard Swellex bolts were used in the initial bolting program because of their immediate availability.
The nature of the material presented several problems for the bolting program.
The safety, speed, and reliability of the bolting system selected must of course be matched with cost effectiveness.
Energy, torque, thrust, and rotation speed of the bolting equipment to be used are also all important variables to be considered in formulating customized anchoring products.
Reduced bolting quality is not necessarily a safety risk where systematic rock bolting is practiced.
This suggests that as forces are redistributed, demands on the support function of a bolting system reduce.