SLR Kensington Pond
BACKGROUND

The CBD and South East Light Rail is a new light rail network for Sydney. The 12km route will feature 19 stops, extending from Circular Quay along George Street to Central Station, through Surry Hills to Moore Park, then to Kensington and Kingsford via Anzac Parade and Randwick via Alison Road and High Street.

As part of light rail project the embankment of the Kensington Pond was to be raised to provide additional flood storage and reduce the frequency of flooding at the Randwick Stabling Yard site and along Anzac Parade, Doncaster Avenue and adjacent streets through Kensington and Kingsford.

In mid-2016, it was confirmed by the Dam Safety Committee that the Kensington Pond should be reclassified as a dam.

SCOPE

The designers determined that a hot-rolled steel sheet pile wall would be ideal to reinforce the dam wall. The layout of the wall involved offsets and curves to facilitate construction of pedestrian footpaths, cycleways, the light rail corridor and Centennial Park access. The sheet piles had to be driven into a very dense sand to provide a cut-off and prevent piping.

OUTCOMES

To streamline and minimise risk, Acciona issued a supply and install contract to J Steel rather than contract the supply and installation separately. The designers adopted J Steel’s recommendations to use heavy AZ48-700, AZ36-700 and AZ26-700 sheet piles in high steel grades (S390GP and S430GP) from their extensive stock. Providing the piles from stock enabled Acciona to move quickly as the design developed without delay to the project waiting for imported sheet piles.

J Steel’s oversight and project management of the sheet piling sub-contractor resulted in reduced administration time and expense to Acciona as well as eliminated the need for them to be involved in any discussions between the material supplier (J Steel) and installer (Avopiling).