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Walsh Bay Wharf 6/7 Submerged Carpark

Client: Walsh Bay Finance (Transfield /Mirvac)
Capabilities: Construction, Piling, Demolition
Region: Sydney (New South Wales)
Completed: November 2001

Wharf 6/7 at Walsh Bay has been redeveloped into what is believed to be the first purpose built residential pier in the world. To maximise the available space, the design required a 14,000sqm carpark to be constructed in the intertidal zone. The floor and part of the walls are permanently submerged below water level.

Waterway Constructions performed a design and construct contract for the works. For the pier portion of the works (210m x 40m) a construction method was devised whereby the basement which weighed 12,000t was cast above water level and jacked down in 8 sections onto piles in it's final location. The shore portion was constructed inside a cofferdam.

The works included:

  • Demolition of 17,000sqm of existing pier
  • Installation of 348 steel piles up to 1000mm diameter and 48m long with ultimate capacities in excess of 12Mn per pile
  • Installation of 156 steel columns and formwork for the basement and level 1 construction
  • Jacking down 8 sections of basement weighing up to 2,000t each
  • Construction of 4,000sqm of sheet pile retaining wall including 48 pairs of anchored support piles
  • Construction of 3,000sqm of timber boardwalk around the perimeter.
Walsh Bay Wharf 6/7 Submerged Carpark
Walsh Bay Wharf 6/7 Submerged Carpark
Walsh Bay Wharf 6/7 Submerged Carpark
Walsh Bay Wharf 6/7 Submerged Carpark
Walsh Bay Wharf 6/7 Submerged Carpark

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