City East Cable Tunnel
Location:
Sydney
Value:
$141 million
Client:
Ausgrid
Capability:
Tunnels
Contract Type:
Lump Sum and Schedule of Rates
Start Date:
December 2011
Duration:
December 2011 to May 2015
The awarding of the City East Cable Tunnel (CECT) contract follows Thiess’ highly successful completion in 2010 of Ausgrid’s City West Cable Tunnel (CWCT).
The 132kV CECT project will draw on Thiess’ vast bank of tunnelling expertise to construct the 3.2 kilometre segmentally lined tunnel under the city. With a diameter of 3.5 metres, the tunnel will connect the existing City North substation in Sussex Street to a new substation in Riley Street, Surry Hills.
The CECT project also includes the construction of two concrete lined connectors, an extension to the City South Cable Tunnel and installation and commissioning of all tunnel mechanical and electrical services.
Thiess will procure a bespoke TBM for the excavation and lining of the cable tunnel.
The completion of the City East Cable Tunnel will complete Ausgrid’s ‘ring main’ for the Sydney CBD, linking both the existing City South Cable Tunnel and the City West Cable Tunnel.
The excavation of such a technically demanding tunnel presents substantial risks. The combination of the significant experience of the Thiess Tunnelling staff, extensive Thiess systems and Thiess’ unyielding commitment to safety provide a rigorous structure by which risks are mitigated. The team aim to build on the highly successful track record of CWCT and the VDP tunnels both of which were completed LTI free.
Thiess will be Constructing a high flow water cooler to recycle water used in the TBM cooling system to enable average savings of 26 mega litres a month. Groundwater will be treated for reuse in the grout batching operations, reducing the need for using potable water.
