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TBM planned for major upgrade

The Hobsons Bay Main Sewer, originally built in the 1960s, is responsible for carrying more than 30 per cent of the city’s wastewater to the Western Treatment Plant.

Melbourne Water will undertake the essential upgrade to boost the sewer’s capacity and ensure the reliability of the city’s sewerage service for the next century.

Melbourne Water General Manager Major Project Delivery Eamonn Kelly said the 2.1 m diameter reinforced pipe that can handle flows of up to 7,700 L/second would be upgraded, while a new sewer main will ensure wastewater flows are diverted during the works.

“The duplicate sewer main will allow for this upgrade to be completed safely and efficiently,” said Mr Kelly.

“It will ensure the continued smooth operation of the sewer network which caters for Melbourne’s growing CBD and bayside suburbs.”

The project will see two shafts up to 30 m deep constructed on either side of the Yarra River and a TBM used to construct the new main.

“The project team is currently working on the design, taking into account the challenging ground conditions on either side of the Yarra River and the existing active sewerage system,” said Mr Kelly.

Melbourne Water has released an expression of interest for the project, from which a limited number of contractors will be invited to tender.

Works are anticipated to begin in 2021.

For more information visit the Melbourne Water website.

If you have news you would like featured in Trenchless Australasia contact Assistant Editor Sophie Venz at svenz@gs-press.com.au

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