[WATER OUR FOCUS]

Green Square Sewer Carrier Main Relocation

Delivering complex sewer diversion works in a constrained urban environment to enable major residential development in Zetland.
Zetland, Sydney, New South Wales

Micro-Tunnelling Installation + Deep Manhole Construction

[Project Background]

Relocating Sewer Infrastructure to Enable Urban Development

The Green Square development in Zetland included four mid-rise residential towers and a three-level basement carpark. Existing sewer infrastructure running through the site required relocation to allow construction of the basement structure.

Killard was engaged to deliver the sewer diversion works, relocating the carrier main outside the development footprint while maintaining the integrity of the surrounding sewer network.

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[Scope Of Works]
Operating in Sensitive and Live environments

Relocating Critical Sewer Infrastructure in Dense Urban Conditions

Construction of launch and receive shafts for microtunnelling operations
Installation of twin 45m bored sewer carrier lines with steel encasing pipes
Construction of cast in-situ DN1800 maintenance holes up to 9m deep
Connection and transfer works to existing sewer infrastructure
Project Technical Snapshot

Installation of a micro-tunnelled sewer carrier main and deep shaft infrastructure within a constrained inner-city environment.

2 × 45m Tunnel Drives
2 × 45m Tunnel Drives
Carrier Pipe Installed
DN450 GRP Sewer Carrier Pipe within OD700 Steel Casing
Manhole Construction
3 × DN1800 Cast-in-Situ Manholes (Up to 9m Deep)
[Outcome / Key Features]
Delivered Critical Wastewater Transfer Infrastructure
Outcome
  • Micro-tunnelling installation of two 45m sewer drives beneath the development footprint
  • Installation of DN450 GRP sewer carrier pipes inside OD700 steel casing
  • Construction of three DN1800 cast-in-situ manholes with HDPE liners
  • New sewer infrastructure connected to the existing Sydney Water network
  • Redundant sewer line safely decommissioned following commissioning of the new system
Key Features
  • DN5500 segmental steel caisson shaft installed as the tunnelling launch pit
  • Innovative shaft construction solution used due to high voltage overhead power lines preventing conventional shoring
  • Deep manhole shafts constructed up to 9 metres below ground level
  • Construction undertaken in highly constrained inner-city conditions with traffic and resident management required
  • Bypass system installed to allow connection to the live sewer network
  • Critical network connection completed during a supervised 12-hour night shutdown
[Environmental Responsibility]
No items found.
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