UEA was responsible for generating suitable bore designs, not only to successfully complete each crossing, but also to maintain required grades, alignments, tolerances and depth of cover. The design and construct aspect of the project enabled UEA to provide solutions that reduced restoration, minimised impact to sensitive Cumberland Plain Woodland and avoided trenching through areas of indigenous cultural significance.
Working closely with McConnell Dowell and Sydney Water, UEA successfully constructed the majority of trenchless crossings on the Replacement Flows Project using HDD. There were a number of bores on the project, with the most significant being:
- Old Windsor Road, Seven Hills – 144m of 355mm
- M7 Motorway crossing, Dean Park – 345m of parallel 355mm and 560mm
- Prospect Highway, Seven Hills – 384m of 355mm
- James Ruse Drive, North Parramatta – 133m of 355mm
- Bells Creek/Richmond Road crossing, Dean Park – 300m of parallel 355mm and 560mm
- Sunnyholt Road, Blacktown – 110m of 355mm
Due to exacting grades, difficult access, busy arterial roads and requirements of pinpoint accuracy, the use of Paratrak HDD guidance technology was required on four crossings. These locations were underneath the newly constructed M7 motorway, the busy intersection of Old Windsor Road and Powers Road, Prospect Highway from Seven Hills train station to Powers Road and a crossing of James Ruse Drive exiting parallel to the Caltex multi products pipeline.
For more information about this project or UEA Trenchless, please send enquiries to Steven Hopkins.