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BAUER Foundations Australia Pty Ltd
Barangaroo, a district of the Sydney central business district, currently faces one of the largest urban development projects in Australia. On the site of the former container port next to Darling Harbour in the north-west toward the Harbour Bridge, a large scale construction project will enlarge the central business district considerably. In Barangaroo South, the southern part of the overall 22 ha site, three major office towers and several smaller residential and office complexes are to be built, linked together with a common three-level basement. A hotel, shops, cafes and restaurants, cultural venues and public spaces are planned, too.
In January 2012, BAUER Foundations Australia Pty Ltd started to carry out the necessary foundation works together with a joint venture partner. By order of the customer Lend Lease, the Australian subsidiary of BAUER Spezialtiefbau GmbH installs approximately 1,000 bored piles up to 35 m in depth and with diameters of up to 2,4 m. The topsoil layer of the former container port consists of various backfill materials, including bricks, concrete, rubble and left in place man-made obstruction like old piers, wharf and seawalls. Beneath another layer of clay, sand and gravel exists rock with strengths of up to 50 MPa, depending on the depth. The main challenge on the project is to deal with man-made sub-ground obstructions like old timber piles, steel members, concrete structures and contaminated soil. Protective clothing is required at all time for staff working on site. Apart from cranes, a 700 m3 bentonite plant and two desanding units, several Bauer rotary drilling rigs of the types BG 24, BG 28 and BG 40 are employed for the foundation works which have a volume of around €27 million ($36 million). The piling works are expected to be completed by the end of June 2013.
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