Cannon Place provides premium office space over Cannon Street Station. The project’s design was inspired by the challenging range of site constraints. The existing station comprises a complex mixture of 1860s brick-vaulted structure and a 1960s concrete-framed redevelopment. Designed by Foggo Associates, the project involved construction of a trussed external frame supporting 21m cantilevers on the northern and southern elevations. The cantilevers and long-span façade truss underwent considerable deflections during construction, and will continue to do so while the building is in service. Displacements were monitored during construction to ensure measurements were in accordance with predictions, and therefore within steelwork installation tolerances.

Project Value
£214 million
Year Completed
2012
Building Metrics
Total Area: 36,999 m²
Levels: 8 storeys
Environmental Performance
Very Good’ BREEAM rating
Sectors
Commercial
Retail
Client
Hines

Primary Contractor
Laing O’Rourke
Architect
Foggo Associates
Robert Bird Group Services
Peer Review
Blast engineering
Construction Engineering
Awards
ICE Award Winner 2012: Buildings

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.

Structural Features

  • Specialist technical consultant role associated with the Category III checking and approvals process required by Network Rail and London Underground.
  • Prediction of structural displacements during construction and assistance in the development of movement and load monitoring strategies.
  • Category II and III design checking of temporary works packages in accordance with Network Rail’s and London Underground Limited’s requirements.

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