Robert Bird Group has been commissioned by the developer of this prestigious residential tower in the Sydney CBD to provide construction methodology, demolition works sequencing, and temporary works engineering services for the project. The unique engineering challenges that RBG will solve include the temporary retention of an existing 26-level-tall structural steel frame, whilst the existing façade and floors are demolished.

RBG worked with the contractor to develop a detailed demolition and reconstruction sequence which adequately addressed the site access, limitations of the capacity of the existing 50-year-old structure and coordination of any temporary works with permanent works.

Project Value:
$700 million
Year Completed:
Building Metrics:
67 Levels
4 Star Greenstar
4 Star AGBR

Greenland (Australia)
Investment Pty Limited
Primary Contractor:
Delta Group (Demolition)
BVN + Woods Bagot
Robert Bird Group Services:
Construction Engineering
Temporary Works Engineering

Key technical challenges

  • The primary tower structure consists of a composite slab and beam structure. Due to the long beam spans and thin slab, extensive analysis for footfall vibration was required to ensure the structure achieved code requirements and client expectations.
  • Working with the existing structure and developing design solutions that strengthened rather than demolished.
  • Extensive co-ordination with the mechanical engineer to develop a strategy that minimised beam penetrations and beam notches.
  • Differential shortening analysis with consideration of mega truss, steel structure, concrete structure and existing structural elements

Environmental performance

  • 5 Star Greenstar
  • 5 Star NABERs Energy and 4 Star NABERs Water ratings.

RBG will also provide shoring and retention design for the existing basement, and underpinning and stabilizing works design for the existing tower whilst new foundations up to 5 metres deep are constructed to support the 67-level permanent works. Basement retention included an interface with the future Sydney Metro rail corridor on Pitt Street.

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