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| Notable Features | |
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Steel structure |
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Concrete core, metal formworks |
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Permanent metal decking formwork for slabs |
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Raised access floor system |
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| Basic Information | |
| Location : | |
| The Queen's Walk, London, UK | |
| Building Type : | |
| City hall | |
| Contract Period : | |
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Construction: 2000-2002 |
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| Contract Sum : | |
| About £35million | |
| Gross Floor Area : | |
| 21,700 m2; 233,579 ft2 | |
| Client : | |
| CIT Group Ltd. | |
| Project Management : | |
| Mace Ltd. | |
| Architect : | |
| Foster and Partners | |
| Structural Engineer : | |
| Ove Arup & Partners | |
| Cost Consultants : | |
| Davis Langdon and Everest, and Mott Green and Wall | |
| Landscape Architects : | |
| Townshends | |
| Planning : | |
| Montagu Evans | |
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| Overview | |
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| The 10-storeys building comprises a meeting chamber, committee rooms and public facilities, together with offices for the Mayor, London Assembly Members and GLA (Greater London Authority) staff. It can accommodate 440 staff and members. The energy strategy will enable the building to run a quarter of the energy consumed by a typical high specification office building. Advanced computer modeling techniques and innovative construction techniques have been employed to achieve the geometry. Many of the building elements, including floor tiles and rubber doormats, were made from recycled materials. The building was designed and built within a period of 30 months. | |
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| A reinforced concrete core and 14 tubular steel columns support a series of offset circular floor slabs with a maximum diameter of 45m. | |
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| Concrete Core |
| The concrete core was cast in-situ with metal formwork system. These formwork can be reused and minimize construction waste generation. |
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| Steel Structure |
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| Various structural forms were investigated. The inclined column solution was chosen for its simplicity, constructability and cost effectiveness. The Ø 508 mm tubular steel columns are straight between each floor and kink within the structure at each floor plate. A network of 675 mm deep primary steel beams tied to the central concrete core bears the horizontal forces needed to restrain the columns. Components and details were standardized as far as possible. The standard “cotton-reel” node allows incoming beam and column connections to be accommodated at any angle. |
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| Permanent Steel Deck Formwork Slab |
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| The use of steel permanent formwork for the slab reduces the generation of construction waste. |
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| Cost Comparison |
| The total budget of the building is about £35 million, which is approximately £1,200/m2. Compared to a normal office building in London which costs about £1,000/m2, the cost is about 15-20% more for this complex shape. But there is an 18% saving on the area of cladding that would be necessary for a box shape building. |
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| Sources |
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Powell K.,
New London Architecture, Merrell Publisher Ltd., London, 2001. |
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Detail
magazine, Serie 2002, No.9, Office Buildings, September 2002. |
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Foster N., On
Foster…Foster On, Prestel, Munich, 2000. |
| www.skyscrapers.com |
| www.fosterandpartners.com |
| www.london.gov.uk |
| www.morelondon.com |
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| Photos on the Internet |
| Construction photos: www.morelondon.com |
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