The new wastewater pipeline connection had to be microtunnelled in difficult ground conditions, with surface clay mixed with medium to hard sub-surface rock.
Furthermore, the route crossed under water bodies, infrastructure including roadways and existing residential zones and under areas of environmental sensitivity.
For the challenging project, HOBAS jacking pipe was contractor Rob Carr’s choice due to its low risk properties. The contractors successfully installed 820 m of DN 1400 HOBAS CC-GRP jacking pipe in multiple drives of almost 300 m. The maximum load was just 200 tonnes.
The project entailed construction of deep shafts and manholes, as well as installation of the DN1400 gravity sewer at grades as low as 0.1 per cent.
The project has brought the residents of Australia’s Sunshine State a new and improved wastewater system.
