Article 1: Overcoming gloving
The findings of two years' research by Solid Energy New Zealand into bolt gloving have highlighted quality issues within the industry. A paper presented at the recent Coal 2004 conference showed poor resin mixing and gloving of the resin cartridge to be present at all five of the Solid Energy mines investigated.
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Article 2: Evaluating pre-tensioned tendons
A remarkable turnaround at UK Coal’s Harworth colliery has been attributed to the use of resin anchored, pre-tensioned grouted tendons in place of previously used passive support. From in-cycle up front development, through remedial support, to specialist applications such as tailgate crib and lifting, the tensioned tendon concept has proven its worth.
