Admiralty Tower 2 was the second residential tower of the four-tower precinct which was the first major CBD residential development in Brisbane. The waterfront site presented major development challenges with highly variable ground conditions.

Year Completed:
1997
Building Metrics:
Levels: 36 + 2 basements
Environmental:
4 Star Greenstar
4.5 Star AGBR
Sectors:
Residential
Waterfront
Client:
Seymour Group

Primary Contractor:
Watpac
Architect:
Douglas Daly and Bottger
Robert Bird Group Services:
Structural Engineering
Civil Engineering
Construction 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.

Significant and interesting aspects of the project and Robert Bird Group’s role include the following:

  • Constructed directly on the riverfront, a coffer dam sheet pile wall was used to retain the Brisbane River during construction.
  • Constructed with flat slab construction and jump form cores for rapid floor cycles.
  • Adjacent heritage-listed masonry wall was restored and incorporated as a feature of the project.
  • Extensive over-river boardwalk and promenade on rock.
  • Foundations varied from pad footings, driven pre-cast piles to 27m and bored piers to 45m.
  • A variety of innovative designs and construction techniques were used to overcome the ground and river water issues associated with the deep basements. Ground conditions dictated individual solutions for each stage, tailored to minimise cost.

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