Australian Water Management Review Vol 2 2013 | Page 51

Kembla Watertech has now successfully rehabilitated multiple heritage listed oviform stormwater pipes in Sydney’s busy CBD in the last 18 months, and countless oviform sewer pipes in heavily populated areas of Sydney over the last five years. As Kembla Watertech celebrates its 20th anniversary of operation this year, the project teams seek to continually improve service and delivery, as well maintain its offering of one of the largest range of trenchless technologies in Australia. For more information on our products and services, visit kemblawatertech.com.au

Insituform crews at work in Brisbane.

Beautiful one day – perfectly lined the next
When Insituform Pacific was awarded three separate contracts for reticulation and trunk sewer main pipe rehabilitation by Queensland Urban Utilities in December 2012, there was an important caveat. Queensland Urban Utilities was dramatically ramping up its investment in pipe rehabilitation and required these contracts to be completed by the end of June 2013. The three contracts amounted to more than 21 km of lining, across highly variable environments – from the heart of the Brisbane CBD, to outlying bushland; from backyards to busy arterial roads. Pipe sizes ranged from 150 mm reticulation lines, up to 1,050 mm carrier mains. Three different innovative cured-in-place pipe (CIPP) products were utilised to meet Queensland Urban Utilities’ (QUU) stringent requirements.

A race against time The contracts presented challenges typical to a project of this nature – consent from a number of local and state government authorities, residential access issues, environmental approvals, traffic management, high-flow rising main discharges and bypass planning certifications – challenges that represented close to a year’s work that would have to be compressed into a period of approximately six months. Queensland’s unpredictable weather threw an additional complication into planning and scheduling. From January to April 2013, Brisbane recorded nearly twice its normal seasonal rainfall. Insituform’s project managers recognised from the start that they would need to pull-out every stop in order to work through the challenges and deliver all three Contracts as planned, while maintaining the highest safety and quality outcomes on each individual job.

Entering the maintenance hole to prepare for cutting cured liner ends.

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