Scope of Works
UEA was engaged primarily for two portions of the work on the Three Towns project – the design and construction of the 460 metre gravity storage pipe from the new Freemans Reach pump station, and the installation of a 250mm transfer main under creeks and roads from the newly constructed pump station to the upgraded Richmond STP.
Works within the pump station site required a large excavation in order to set up the D100 x 120 on a positive grade from the beginning of the bore. Difficulties arose when large Quartzite cobble was encountered along the bore line of the same type, requiring casing on the Hawkesbury River HDD crossing. The PSP delivery team and UEA’s team used forward thinking and developed a successful methodology whereby a shaft was excavated over the required connection point, eliminating the need for casing and allowing the successful installation once reaming works were complete.
Installation of the 250mm transfer main included several creek crossings, two main road crossings, working in close proximity to defence force assets and the under boring of the Western Suburbs railway line whilst remaining in service.
For more information about this project or UEA Trenchless, please send enquiries to Steven Hopkins.