Logan Reserve 110kV
Logan Reserve, Queensland, Australia
As part of their new 110kV project, Energex required an electrical conduit route from Glen Road Loganlea to overhead powerlines at Jimboomba. Diona installed over 2.2km of conduits. In addition, Diona contracted Dunstans Construction Group to bore 805m under two sections of the Logan River. The cables were connected along the route in concrete joint pits constructed by Diona.
The project presented a number of risks and challenges that were effectively managed with careful planning.
The main challenge was the 830m horizontal directional drilling (HDD) bore under the Logan River. This was one of the longest ever undertaken by Energex, and there was uncertainty about whether it was possible. The cable pull was also one of the longest continual pulls Energex had ever designed. The tensions had to be calculated precisely to ensure the cable would not be damaged during installation.
The rural location added to the challenge of getting the large cable drums to the site. A large storage area was required. The bore pipe had to be welded up beforehand, and we needed to find room for 830 m of pipe. As our team had to occupy private land to string out the bore pipe, effective liaison with landowners was additionally crucial to the project’s success.
With a tight schedule and a busy site, our team had to be well organised to meet daily production targets. There was a lot of activity on site with civil crews, and concrete deliveries backfilling the trench.
Creeks and environmentally sensitive areas were also carefully considered in the planning phase, and techniques such as HDD were used to avoid damage.