Scope of Works
Potable Water:
- Approximately 1500 metres open cut and lay methodology
- The pipe sizes ranged from DN200-250 DICL with concrete encased MSCL used on road crossings
- Five connections to existing mains along Tallawong Road, Schofields Road and within the Cudgegong Train Station Precinct
Recycled Water:
- 1300 metres open cut and lay of DN150-200 PVC pipe within a dual trench alongside the potable water line, including six connections to existing mains
- 25 metre laser-guided GBM thrust bore across Tallawong Road, which involved the installation of a DN450 steel enveloper pipe and a DN200 PVC carrier pipe
- 80 metre long OD250 bore using horizontal directional drilling (HDD) methodology in PE pipe across Schofields Road
Waste Water (Sewer):
- Approximately 300 metres open cut and lay
- 100 metres laser guided GBM thrust bore installing a DN650 steel enveloper case for a DN300 UPVC sewer line
- Eight maintenance pits were constructed in total, including two maintenance shafts and six DN1200 manholes (one being 8.4 metres deep)
Challenges
- Open cut excavation and trenching in zones of hard shale
- Thrust boring completed under creek crossing in extremely weak siltstone, with a major emphasis on reducing environmental impacts to flora and fauna
- Detailed sewer cutover procedure connecting to a live DN750 sewer main
- Scheduling works within a fast paced, large scale infrastructure project with numerous work fronts
COMPLETION
The project highlighted the benefit of engaging a multi-disciplined utility contractor that was able to deliver all facets of the scope in house and to a high standard. The project was delivered on time and without any major HSEQ issues.
