SCOPE OF WORKS
Working closely with McConnell Dowell and Sydney Water, UEA successfully constructed the large 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 – 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
CONSTRUCTION
UEA utilised several HDD rig types to successfully deliver this project: Vermeer D300, Vermeer D100, Vermeer D50 and Vermeer 36×50. 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:
- 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
- A crossing of James Ruse Drive exiting parallel to the Caltex multi products pipeline
OUTCOMES
Despite the complex nature of the bores, high service density, tight timeframes and difficult ground conditions, UEA delivered all of the HDD crossings on time, within tolerance and to budget.
