Melbourne Main Sewer Replacement

Melbourne Main Sewer Replacement, VIC

First built between 1894 and 1897, the 2.3km $177 million Melbourne Main Sewer Replacement project spans from Docklands, across the Yarra River, and into the Port of Melbourne. The project has increased the capacity of the original sewer three-fold in order to cater for Melbourne’s growing inner suburbs.

Over 2 km of the main sewer pipeline was constructed by a 3 m diameter earth pressure balance tunnel boring machine (EPB TBM). Primary support was 2.4 m pre-cast concrete segments with a final Glass Reinforced Plastic lining (1.8m ID) installed and grouted in place following tunnel excavation. The 142 m long section across the Yarra River was constructed using cofferdam, increasing construction efficiency.

Six major access sites of up to 15m in depth were constructed along the corridor to connect 2 km of new branch and reticulation sewers. The final section of the main alignment was completed using a 2.4 m diameter Earth Pressure Balance Pipejack Tunnel Boring Machine. The project also constructed 35 soft ground shafts, 2 km of reticulation sewers and temporary bypass pumping facilities capable of 1000L/S. In Alliance with GHD and Aurecon, this project was delivered on time, and under budget.


  • Winner – 2012 Victorian CCF Earth Awards, Civil Contractors Federation, Australia
  • Winner – 2012 Project of the Year, New Installation, Australasian Society of Trenchless Tunnelling