Design & construction of a driven precast pile solution, with continual monitoring of existing wharf movements and pile as-built positions

The project

889 Collins Street Project is a multi-storey residential development located on the Yarra River in the Victoria Harbour Precinct on Collins Street.  The structure comprises a 30 Level North Tower and a 24 Level South Tower, combined to deliver 550 apartments with car parking situated in the 6 level podium structure.

440No. precast concrete piles of 270mm, 350mm and 400mm square size driven to 36-38m depth. 132No. sheet piles 600mm wide driven to 9 metres to support lift shaft excavation and shaft construction.

The challenge

Install precast piles, which are a displacement type pile, with a system to minimise movement of the upper soft soils adjacent to an existing sheet pile retaining sea wall.

The solution

A detailed sequencing focus for installation of precast piles, as well as predrilling of piles, was undertaken to minimise ground displacement. Monitoring of pile as-built information with continual review and amendments of pile design to accommodate ground movement.

Project Facts

Owner

Lend Lease Building Contractors Pty Ltd

Main Contractor(s)

Lend Lease Developments Pty Ltd

Keller Business Unit(s)

Keller

Engineer

N/A