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Elements and Performance Criteria
- Plan and prepare for large diameter auger drilling
- Operate large diameter auger drill
- Carry out pre-start and start up procedures
- Identify, select and apply rig operational controls
- Collar borehole, start hole, maintain hole alignment, take corrective action for deflections
- Make up appropriate drill string
- Handle additional drill stems, inserting them in the drill string
- Use appropriate gears, rotation, feed and holdback so that flights or bucket are substantially full for the soil being drilled at any given depth
- Interpret drilling factors to determine conditions at the bit
- Make and break auger string and drive head connections
- Maintain a clear hole and a clear bottom and deploy tools for cleaning hole bottom at completed depth
- Interpret or calculate actual depth at any point during drilling, interpret depth of strata changes and identify fill depth in any bore
- Select appropriate strategies for recovery of dropped augers
- Recover drill string using winch and/or head/kelly
- Insert surface casing and deepen hole using smaller diameter auger or bucket, if required
- Disassemble drill string and change augers and bit components
- Select bits for formation being drilled
- Select appropriate augering method for situation
- Maintain spoil removal from hole collar
- Cover and secure bores
- Prepare and submit paperwork for daily activities
- Continually monitor hazards and risks, and ensure safety of self, other personnel, plant and equipment
- Select and use water and drilling fluids as appropriate
- Bell foundation piles, if required
- Clean pile bases and insert reinforcement cages, if required
- Deploy bucket augers through surface casing and when drilling under bentonite muds
- Use spin off and side casting of spoil as appropriate
- Record daily hole depths and progress
- Respond to problems
- Complete equipment maintenance and housekeeping
Performance Evidence
Evidence is required to be collected that demonstrates a candidate’s competency in this unit. Evidence must be relevant to the roles within this sector’s work operations and satisfy all of the requirements of the performance criteria of this unit and include evidence that the candidate:
locates and applies relevant documentation, policies and proceduresworks effectively with others to undertake and complete the large diameter auger drilling tasks that meets all of the required outcomes including:complying with written and verbal reporting requirements and procedurescommunicating clearly and concisely with others to receive and clarify work instructionscommunicating clearly and concisely with others to resolve coordination requirements prior to commencing and during work activitiesdemonstrates completion of large diameter auger drilling that safely, effectively and efficiently meets all of the required outcomes on more than one (1) occasion including:collaring borehole, starting hole, maintaining hole alignment, taking corrective action for deflectionsmaking up appropriate drill stringhandling additional drill stems, inserting them in the drill stringusing appropriate gears, rotation, feed and holdback so that flights or bucket are substantially full for the soil being drilled at any given depthinterpreting drilling factors to determine conditions at the bitselecting appropriate strategies for recovery of dropped augersrecover drill string using winch and/or head/kellyinserting surface casing and deepen hole using smaller diameter auger or bucket, if requireddisassembling drill string and changing augers and bit componentsabandoning, covering/securing bores to ensure safety of others and crew
Knowledge Evidence