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Self Drilling Rock Bolt System for the Coal Industry

Self Drilling Rock Bolt System for the Coal Industry. Ground Support Services Pty Ltd & Alminco Pty Ltd March 2008. Advanced SDRB System. Installation System New Alminco Crawler Rig Integrated Bolting & Resin Pumping System Standard Steel SDRB New Telescopic SDRB

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Self Drilling Rock Bolt System for the Coal Industry

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  1. Self Drilling Rock BoltSystemfor the Coal Industry Ground Support Services Pty Ltd & Alminco Pty Ltd March 2008

  2. Advanced SDRB System • Installation System • New Alminco Crawler Rig • IntegratedBolting & Resin Pumping System • Standard Steel SDRB • New Telescopic SDRB • New Fibreglass SDRB • Future Directions © 2008 GSS Pty Ltd & Alminco Pty Ltd

  3. Objectives of the SDRB project: • Pumpable Resin Bolting System • Fit existing machines • Resin tanks, resin pumps, delivery system etc • Roof and Rib support • Minimise manual handling • Maximise rock support • Improve Productivity © 2008 GSS Pty Ltd & Alminco Pty Ltd

  4. Installation System Standard Crawler Rig with new engineering features: • Integrated & self contained • Operator seated remote from drilling & resin injection operation • Standard drill mast – vertical & horizontal drilling • New innovative Drilling Chuck © 2008 GSS Pty Ltd & Alminco Pty Ltd

  5. Installation System New Drilling Chuck features: • lightweight with RH & LH mounting • offset drive motor with quick detach injection head • 2 speed with RH & LH rotation • through drive socket tension to roof © 2008 GSS Pty Ltd & Alminco Pty Ltd

  6. Resin System Resin Delivery System: • Two separate systems with resin pressure control • Twin 120 litre tanks (easily increased) • New Injection Head: • seamless water & resin injection & flushing • quick change over & replacement © 2008 GSS Pty Ltd & Alminco Pty Ltd

  7. Why Pumpable Resin SDRB? • Full bolt encapsulation maximises roof support • Resin fills cracks & cavities • No gloving, no plastic film • Perfect resin mixing every time • Resin fills bearing plate & locks mesh in place • Minimises water inflow & bolt corrosion full encapsulation both inside and outside bolt © 2008 GSS Pty Ltd & Alminco Pty Ltd visible resin at collar proves full encapsulation resin fills bearing plate & also locks mesh in place

  8. Plate Design • Round design – stackable with no orientation required • “soft” footprint won’t damage mesh • Large plate “footprint” • Resin can fill bearing plate & lock mesh in place & provide intimate surface contact • Once full of resin, becomes very strong in compression © 2008 GSS Pty Ltd & Alminco Pty Ltd

  9. Standard Steel SDRB • One piece • No drive dollies, no drill rods, no resin cartridges • fast penetration with high thrust • High Capacity ~ 36 tonnes • High load transfer capacity >1.4 tonnes/cm • Custom bearing plates with “soft” footprint © 2008 GSS Pty Ltd & Alminco Pty Ltd

  10. Rock Drilling Rock Drilling with SDRBs: • Possible to drill 80 MPa concrete with blue metal • Tungsten carbide ensures maximum penetration rate • Tungsten carbide equates to about 4 seconds in time cost © 2008 GSS Pty Ltd & Alminco Pty Ltd

  11. Principle of the Telescopic SDRB 1 4 3 2 © 2008 GSS Pty Ltd & Alminco Pty Ltd

  12. Principle of the Telescopic SDRB ~3.4m 5 6 7 © 2008 GSS Pty Ltd & Alminco Pty Ltd

  13. New Telescopic SDRB • One piece • Automatically extendable • No couplers, no drive dollies, no drill rods, no resin cartridges • High Capacity ~ 36 tonnes • High load transfer capacity ~2.0 tonnes/cm • Fast, simple 3.4m 1.9m © 2008 GSS Pty Ltd & Alminco Pty Ltd

  14. New Fibreglass SDRB Fits same Drill Chuck as steel SDRBs nut & thread >10 tonnes Hollow Fibreglass Rod >30 tonnes Simple, high speed, high capacity © 2008 GSS Pty Ltd & Alminco Pty Ltd

  15. New Fibreglass SDRB Spiral wound surface provides undulations Grit coated surface Surface provides very high load transfer capacity ~ 1 tonne/cm © 2008 GSS Pty Ltd & Alminco Pty Ltd

  16. New Fibreglass SDRB Injection moulded thread Hollow Fibreglass Rod Hardened Steel Drill Bit Small borehole annulus © 2008 GSS Pty Ltd & Alminco Pty Ltd

  17. New Fibreglass SDRB Coal Drilling in Ribs: • hardened steel drill bits okay for coal ribs • patented Drill Bit design enables small borehole annulus • minimises resin volume • maximises load transfer capacity © 2008 GSS Pty Ltd & Alminco Pty Ltd

  18. Bolt Performance © 2008 GSS Pty Ltd & Alminco Pty Ltd

  19. SDRB Drilling in 80 MPa concrete Points to Note: • Drilling in 80 MPa concrete with blue metal • Penetration rate reasonable • Rotary drilling only – no percussive • Note water being displaced by resin • Full resin encapsulation of bolt and plate © 2008 GSS Pty Ltd & Alminco Pty Ltd

  20. Full Resin Encapsulation Resin filling “cavities” The pumpable resin system synergistically enhances the SDRB & the bearing plate © 2008 GSS Pty Ltd & Alminco Pty Ltd

  21. Refine & test Crawler mounted System • Large scale secondary bolting demonstration • Quantify field support performance: • mechanical & geotechnical & cycle times • Engineering design for a production face system • Future Continuous Miner mounted system Future Directions: © 2008 GSS Pty Ltd & Alminco Pty Ltd

  22. Thanks: Acarp Xstrata Alminco © 2008 GSS Pty Ltd & Alminco Pty Ltd

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