Horizontal Directional Drilling, Tru-Line Civil, Akaroa, documentary, photography, Akaroa Water Supply Stage 3, Reticulation Upgrade, Vermeer HDD,

Back reaming commences at the receiving trench. Close radio contact is maintained between the Hydro-vac truck crew and the drill operator. The pilot hole is 125mm Ø, the water main pipe diameter is 180mm, the back reamer reams out a 250mm Ø hole on the way back. The back reamer displaces the additional 125mm Ø of the borehole as cuttings suspended in the drilling fluid. This is the sediment laden slurry we see being discharged out of the bore hole alongside the pipeline.


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