YVW – Donnybrook Link Branch Sewer - Stage 1

DBL 2Donnybrook Link Branch Sewer will provide extra capacity to accommodate expected growth within the Northern Growth Corridor. Stage 1 was connected to the Amaroo Main Sewer.

Key construction aspects of Donnybrook Link Branch Sewer Stage 1 involved the installation of:

  • 450m of DN800 GRP SN10,000 sewer by open cut methodology
  • 250m of DN860 GRP SN80,000 sewer by trenchless methodology
  • 350m of DN860 GRP SN64,000 sewer by trenchless methodology
  • 4 x 1500mm diameter GRP maintenance holes
  • Design and construction of 1 x 4200 mm diameter GRP maintenance hole with vortex drop at 17m deep

Project Challenges

  • Construction depths of up to 17 metres
  • High risk activity; excavation works near Melb-Sydney optic fibre cable
  • Boring in mixed ground conditions