equipment using self drilling bolts to …€¦ · peter corbett technical services manager...
TRANSCRIPT
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EQUIPMENT USING SELFDRILLING BOLTS TO MINIMISE
EXPOSURE TO STRATA HAZARDSIN UNDERGROUND COAL MINING
Peter CorbettTechnical Services Manager
Centennial Angus Place
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BACKGROUND• Centennial Angus Place (3Mtpa Longwall Mine)
• History of difficult strata conditions and injuries
• Underground Coal Industry – history of fatalities and injuries from strata failure
• Projects to reduce operator exposure to hazardous strata conditions
• Issues and project results to date
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TASKS WHERE OPERATOR EXPOSURE COULD BE REDUCED
1. Roof Cavities in Roadway Development
2. Longwall Recovery Face Rib Bolting
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STRATA HAZARD TO OPERATORS
Face
Normal Roof Cavity Forms
Continuous Miner
Roof Falls Out Before Support – Hazard to
Operators
Continuous Miner
Continuous Miner
Cavity Gets Too Large to Control
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PREVIOUS CAVITY SUPPORT METHOD
Hand Held Roofbolter
Elevated Work Platform
Drill Rotation Torque
Reaction Torque Transferred
Though Bolter Handle to Operator
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STRATA SUPPORT HAZARDS
• Falling objects (coal or rock) can strike operators
• Working at heights (beyond limits of equipment) – operators can fall
• Operators struck by hand held roof or rib bolters
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THE SOLUTION
Spiling from the Continuous Miner:
– Ensure operators not exposed to hazardous strata conditions
– Use self drilling & self grouting bolts
– Design a custom drill rig for installation
– Integrate Spiling into development process
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CONCEPT- MINER MOUNTED SPILING RIG
Continuous Miner Cutter Head
Face
Spiling Rig
Spiling BoltRoof
CavitySpiles in Face
Subsequent Roof Level
Below Spiles
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BENEFITS & EFFECTS• No accidents / incidents (spiling process)
• Effectively stopped cavity propagation
• Operators not exposed to unstable roof
• Integrated part of development process
• Spiling cycle time reduced (from 6.7 to 1.2 shifts)
• Equipment Design / Supply Cost $100, 000
• Implementation September 2006
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ISSUE 2: LONGWALL RECOVERY FACE RIB BOLTING
• Required to protect operators during longwall equipment recovery
• Unable to use conventional resin anchored bolts – drill hole closure
• Sprayed products ineffective - convergence
• Split set friction bolts – installation issues
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SHEARER MOUNTED LW FACE DRILL RIG
Longwall Shearer
Longwall Face Drilling Rig
Carriage / Slide Assembly
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BENEFITS / EFFECTS• No injuries
• Most effective face rib support to date
• Highly productive (100 bolts in 8hr shift)
• Implemented February 2007
• Design / Supply Cost $70, 000 (2 Rigs)
• Review meeting – several improvements
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RISK MANAGEMENT PROCESS• Project Team (Process Based)
• Consultation with Workforce Representatives
• Pre-design Meetings & Underground Visits
• Preliminary Equipment Design
• Presentation to Project Team (3D Modelling)
• Risk Assessments (FMEA / WRAC / JSA)
• SWP Preparation for Trial Operation
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RISK MANAGEMENT PROCESS• Compliance Standards of Engineering Practice
• Pre-Commissioning Trials – modifications
• Certificate of Compliance
• Operator training / assessment / authorisation
• Commissioning Process - “fine tune” SWP’s
• JSA’s during commissioning
• Review operations after use
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INNOVATIVE CONCEPTS USED FOR EQUIPMENT / PROCESS IMPROVEMENT
• Use of self drilling / self resin anchoring bolts in areas with high risk of strata failure
• Equipment designed to allow operator to drill / install support remotely from hazardous strata conditions
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SIGNIFICANCE• First operational uses of Hilti One-Step bolts
• Equipment designed to minimise operator exposure to hazardous strata conditions with major risk reduction
• Equipment / Methods transferable to other operations
• Successful partnering between industry and suppliers – further projects planned