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DRE20 Recovery. The Problem DRE20 was positioned at a combined angle of 45.5 degrees from the horizontal. The Objectives Recover DRE20: Safely. Minimise collateral damage to the machine. To allow return to work as soon as possible. DRE20 Recovery. The Problem Con’t. DRE20 Recovery.

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dre20 recovery
DRE20 Recovery
  • The Problem
    • DRE20 was positioned at a combined angle of 45.5 degrees from the horizontal.
  • The Objectives
    • Recover DRE20:
      • Safely.
      • Minimise collateral damage to the machine.
      • To allow return to work as soon as possible.

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DRE20 Recovery
  • The Problem Con’t

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DRE20 Recovery
  • The Problem Con’t
    • Material in the area does not have a high bearing capacity.
    • Machine could not safely be recovered using traditional methods of material removal from under the tub due to the type of material and the angle of the machine.
      • In previous recoveries, machines had slipped along the centreline of the machine (ie Nose down, or ballast box down).
      • Initial meetings determined that traditional recovery methods were not able to be applied in this situation.
    • Initial Centre of Gravity checks determined that the machine required a restraint to be used to control movement.

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DRE20 Recovery
  • The Solution:
    • The recovery of DRE20 required the collaboration of experts in their field of Engineering.
  • The Recovery Method:
    • After the slip, the machine was stabilised and planning had begun on the method of recovery to meet the objectives.
    • Excavation to a level to allow DRE20 to sit level.
    • Attach winch frame and position dragline buckets as anchor points
    • Complete excavation under tub
    • Winch machine back to a level position to allow it to walk out under its own propel system
    • Repair machine as needed.

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DRE20 Recovery
  • Overall Recovery Plan

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DRE20 Recovery
  • The Righting Frame
    • Weighed 30 Tonnes and was made of 1200mm Welded Beams.
    • When load is applied, it moves the CoG toward the rear of the machine 1m for every 100t applied.

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DRE20 Recovery
  • Dragline Bucket and Winch Location

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DRE20 Recovery
  • Dragline Bucket Installation and Winch Location

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DRE20 Recovery
  • Ready to Winch

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DRE20 Recovery
  • Video – Initial Cut with Excavator

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DRE20 Recovery
  • Video – RC Dozer in action

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DRE20 Recovery
  • Video – RC Dozer in action

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DRE20 Recovery

Video – RC Dozer in action

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DRE20 Recovery
  • Video – RC Dozer in action

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DRE20 Recovery
  • Video – RC UG Miner in Action

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DRE20 Recovery
  • Almost level

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DRE20 Recovery
  • Level!!!!

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DRE20 Recovery
  • Repairs post Levelling
    • LHS Boom Foot Stiffening between Clusters 1 and 2.
    • Lube Room Panel Beating
    • Crack repairs
    • Motor Armature cables replaced
    • Oil re-filled

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DRE20 Recovery
  • Thanks
    • To everyone involved, as the recovery would not have gone as smoothly without your input and help.

H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

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