Development of a new roof bolt technology to improve gate-road performance

Journal Article · Sat Oct 01 04:00:00 EDT 2005 · Coal Age

OSTI ID:20688486

Caggiano, V; Rauch, G; Beck, K -D; Chen, J ^[1]

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1. Hilti, Inc. (United States)

Hilti has developed, in conjunction with Foundation Coal, a self-drilling bolt that cuts roof bolting times. The system uses a wet, self-drilling, hollow bolt technology with a self-contained resin cartridge. The resin is dispensed using an injection adapter that provides the high pressure water needed to dispense the resin. The OneStep roof bolt contains an axially shifting mixer that ensures the resin is properly mixed as it exits the water ports near the end of the bolt near the drill head. This eliminates the opportunity for plastic materials to interface between the strata and the bolt. In 2004 the OneStep Bolt was successfully installed in DSK's Prosper Haniel Colliery in Germany, achieving a 42% reduction in single-boom roof bolt cycle time and a 36% reduction in twin-boom roof bolt cycle time. Foundation Coal will be installing 2000 6 ft active bolts in one of the North Appalachian longwall locations. 1 fig.

• OSTI ID: 20688486
• Journal Information: Coal Age, Journal Name: Coal Age Journal Issue: 10 Vol. 110; ISSN 0009-9910; ISSN COLAA7
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
LONGWALL MINING
MINE ROADWAYS
ROOF BOLTS
STRATA CONTROL