At 310 meters tall, the iconic Renzo Piano design redefines London’s skyline, with 87-storeys above ground and three below.

RBG proposed and developed an alternative construction method (for frame contractor, Byrne Bros) which saved over four months on the programme and significantly reduced risk to the head client, Sellar Properties.

The jump-start core method supported the core with plunge columns while the basement and core foundations were simultaneously constructed below. This established tandem work fronts thereby minimizing the risk of delays in basement construction and allowing the superstructure to proceed significantly earlier than the original construction programme had anticipated.

Project Value:
$60 million
Year Completed:
Building Metrics:
Total Area: 110,000 m²
Levels: 9
Vehicles: 2800

Design Inc.
Robert Bird Group Services:
Structural Engineering
Civil 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.

Features include:

  • Long-span post-tensioned concrete banded floor plates in co-ordination with D&C contractor.
  • Concrete moment frame used to resist lateral horizontal loads, minimizing the requirement for shear walls.
  • Efficient deep-pile system to rock level.
  • A perimeter crash barrier design using tensioned stainless-steel cables anchored into concrete columns, developed in conjunction with the builder and Bifen (specialists).
  • Internal two-lane circulation ramp with continuous grade, eliminating transition zones at each level.
  • Connection of 60m cable stayed bridge to connect frame using concrete nodes, in addition to post-tensioned beams transferring permanent loads to internal steel bracing.
  • Increased capacity of columns, walls, piles and lateral frame to allow future expansion to 12 levels.

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