Scope of Works
UEA’s engagement involved mobilising a number of maxi rig spreads to Port Kembla to complete the package of ten underbores – a combination of two Herrenknecht 250Cs, a Vermeer D330, a Gallagher 660 and a Gallagher D100.
Three steering engineers were designated to the works at the height of the project. Paratrack2 was utilised as the designated method of tracking for eight of the underbores, with a combination of a Beacon and Coil used across the various sites. Due to unforeseen access restrictions for one of the sites, the methodology was changed, and a Gyro module was mobilised and utilised to ensure the accurate steering of the pilot bore.
KEY PROJECT HIGHLIGHTS
- The successful installation of a road crossing that entailed a two-day pipe installation with two tie in welds.
- Innovative methodology to overcome excessive volumes of ground water and prevent the ingress of contaminated water.
- Installation of the longest HDD on the project (950 metres).
- Utilisation of Gyro to successfully pilot as per the design project tolerance for an underbore that did not have alignment access.
- Completion of one underbore through hard rock exceeding 160mpa.
- All underbores were compliant with Jemena and Nacap’s mechanical completion specification.
OUTCOMES
Following the completion of each underbore, a coating integrity test was conducted by a NACE Certified Cathodic Protection Specialist, all installed pipes received a successful result. UEA delivered the underbores on time and the team was able to overcome the various challenges that each separate underbore posed.
