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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.

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