The central terminal building incorporates an extension to the Piccadilly and Heathrow express train services, in total there is 13.5km of new underground rail and roads.

Project Value:
£180 million GBP
Year Completed:

Laing O’Rourke
Robert Bird Group Services:
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.

Key technical challenges

Robert Bird Group undertook a Design Review and Value Engineering Study of the Terminal structure, resulting in:

  • Deletion of in-situ hydrostatic basement slabs across majority of the site in favour of innovative precast voided slab solution, eliminating hydrostatic water pressure and soil heave.
  • Deletion of in-situ concrete basement walls requiring formwork and open-cut excavation, in favour of an embedded wall system requiring less excavation and minimal formwork.
  • Alternate flooring system, recognised as cost advantageous, but not adopted due to lack of time for services re-coordination.

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