NORTH WEST SYDNEY ASSET RELOCATION

Project Overview

UEA was contracted to install various underground utility services and provide a turnkey package around the newly constructed Cudgegong Train Station.

Location

Cudgegong Road, Schofields NSW

Geology

Clay & shale

Client

On behalf of Sydney Water

Length

~3,300 linear metres

Pipe

DICL, MSCL, PVC, PE

Technique

Conventional open cut excavation, HDD, GBM thrust boring

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.

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