17 Spring Street stands as a 34-storey tower with four basements on the fringe of the CBD. Bound by adjacent towers with shallow basements, the building is primarily composed of apartment floors complemented by retail podiums offering access to designer brands for the tower’s residents. Designed to deliver a luxurious urban lifestyle, the apartments feature an attractive interior design, superior finishes, and captivating views.
As the primary structural engineer, Robert Bird Group was heavily involved in the project from its early stages, working closely with the client, architect, and other key consultants to create a design that would maximise the output of the site. Following the novation to the contractor, other key constructability challenges were identified based on the site conditions and adjacent structures, where RBG worked diligently with Hacer to provide solutions that mitigated risk and increased the buildability of the tower
Key technical challenges
- Top down slab: The design top down slab at 17 Spring Street was not only driven by site constraints, but it also had to be shallow to manage with architectural head-heights below.
- Retention against an adjoining high-rise: The temporary stability of an adjacent high rise was managed whilst constructing the retention system. 900 diameter contiguous piles were provided and monitored daily to ensure that minimal and strict movement controls were adhered to.
- Slender tower with eccentric core: An eccentric core within a slender tower meant that careful considerations of permanent tensile actions within some faces of the core needed to be managed.
- Deep Basement: The construction of the deep basement required a coordinated effort with early works contractors, to produce a staged construction utlising soil anchors, that would safely allow an excavation of almost 20m depth.
Project Metrics
Project Value:
$110 million AUD
Year Completed:
2022
Sectors:
Residential & Retirement, Retail
Project Metrics
Primary Contractor:
Hacer Group
Architect:
Bates Smart
Robert Bird Group Services:
Structural, Civil