June 2014 -Sydney Water Sewer Lining Project wins the NSW CCF Award

Interflow is pleased to advise that on Friday 27 June 2014 we were presented with the NSW Civil Contractors Federation (CCF) Award,…

Category 1 (Project value up to $1 million) for the outstanding work in the delivery of the Sydney Water Double Bay ovoid sewer rehabilitation project.

The project involved the renewal of a large size ovoid shaped sewer in Sydney’s harbour side suburb of Double Bay. Because it was an ovoid shape, rather than a circular sewer, Expanda Pipe was not suitable. The sewer was extremely deep in an area with a high water table, meaning that our CIPP liner did not have enough strength to meet Sydney Water’s design Specification.

This challenge didn’t stop us. We worked the problem through with Sydney Water and identified a fibreglass reinforced liner from Germany, cured by UV light rather than hot water, which was strong enough to meet design requirements.

However, if it was to meet the requirements of this project, it needed to be thicker and heavier than the manufacturer had previously supplied for this size anywhere in the world. It also had to be installed to 14 metres depth in continuous lengths up to 185 metres, so the team worked with the manufacturer to develop suitable installation procedures for the project and then carried out training and trial installations at our Girraween workshop.

Most of the access chambers were located in private properties where excavation was not practical, one being inside an underground car park for an apartment block. Good planning and community relations was therefore an essential part of the project.

Armed with a well considered solution, a solid plan, and Sydney Water’s cooperation, the team went to work delivering this complex project without incident.

Thanks and congratulations to all those who were involved in making this project a success, including Sydney Water for their willingness to work with us to deliver a State of the Art solution in very challenging conditions.

This Project now qualifies for consideration for the National CCF Awards.

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