The project involved the demolition of a train unloading facility and a connected underground conveyor belt at Iluka resource’s decommissioned Narngulu Synthetic Rutile Plant. These facilities were removed to accommodate for the future demolition of the plant by allowing the re-routing of underground services through this area to the only remaining operational area of the plant.
Works first began on the demolition of the conveyor tunnel. This was a 40m long concrete tunnel beginning at ground level and descending to the bottom of the train unloading facility 10m underground. This was demolished by first progressively excavating and exposing the underground concrete conveyor tunnel. As the tunnel was gradually exposed, it was demolished using the concrete hammer of the 48 tonne excavator. All conveyor infrastructure was then removed using the mechanical shear attachment.
Works then began on the train unloading facility. The above ground shed first had to be removed. A variety of oxy-cutting techniques was used to pre-weaken the columns. The structure was then grabbed using the 48 tonne excavator to safely pull it over. Excavation was then resumed to expose one underground wall of the train unloader facility. This wall was then demolished using the concrete hammer attachment of the excavator. The excavator was then able to reach in to demolish and remove the hopper and other infrastructure inside this area using the mechanical shear attachment. This marked the completion of demolition works, however 10m deep excavation still remained. The area was progressively backfilled and compacted using the excavated material and imported fill material that was obtained elsewhere from site. The excavation area was compacted using a 20 tonne pad foot roller in 350mm lifts to a dry density compaction of 95%. The site was then levelled and road base laid, marking the completion of all works.