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Innovative Recovery Method for DRE20: Overcoming Challenges at 45.5 Degrees

The recovery of the DRE20 machine, positioned at a 45.5-degree angle, posed significant challenges due to the low bearing capacity of the surrounding material and the need for specialized techniques. Traditional recovery methods were deemed unsuitable, necessitating expert collaboration for a tailored solution. The recovery involved stabilizing the machine, excavating to level it, attaching winch frames for control, and ultimately winching it back to safety. The plan aimed to minimize collateral damage and ensure a swift return to operational status, with extensive repairs conducted afterward.

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Innovative Recovery Method for DRE20: Overcoming Challenges at 45.5 Degrees

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

  2. DRE20 Recovery • The Problem Con’t H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

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

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

  5. DRE20 Recovery • Overall Recovery Plan H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

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

  7. DRE20 Recovery • Dragline Bucket and Winch Location H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  8. DRE20 Recovery • Dragline Bucket Installation and Winch Location H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  9. DRE20 Recovery • Ready to Winch H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  10. DRE20 Recovery • Video – Initial Cut with Excavator H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  11. DRE20 Recovery • Video – RC Dozer in action H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  12. DRE20 Recovery • Video – RC Dozer in action H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  13. DRE20 Recovery Video – RC Dozer in action H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  14. DRE20 Recovery • Video – RC Dozer in action H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  15. DRE20 Recovery • Video – RC UG Miner in Action H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  16. DRE20 Recovery • Almost level H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

  17. DRE20 Recovery • Level!!!! H:\01 Administration\Presentations\State of Nations\2008\State of Nation – July 2008

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

  19. 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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