Education: Croydon College, Surrey

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Education An extra floor and a new roof have been added to two wings College remodelling A new entrance hall housed within a glazed rotunda and extra floors added to two existing buildings are just part of the extensive work being undertaken at a The rotunda features an atrium spanned by south London college. bridges linking into the existing building Croydon College, Surrey CLondon’s largest vocational The perimeter curvature of the rotunda access machines were restricted on the small“Once the CHS columns were up oursteel frame for the upper parts of the rotunda.roydon College, one of southFACT FILE Client: Croydon College colleges, is currently in the midst structure was one of the main reasons for tight site and could only reach to level three,” Architect: Nightingale of a large remodelling project, choosing a steel frame. Much of the steelwork adds Mr Burchnall. The basement slab also Associates a scheme that will keep the establishment will remain exposed and consequently had a weight restriction which also limited Main contractor: ISG at the forefront of training and education, aesthetically pleasing CHS sections have been the size of machine that could work on it. Structural engineer: while making widespread use of structural used throughout its semi-circular shape. “This meant we had to erect the internal Hambleton Partnership steelwork. “We weren’t allowed to splice these large steelwork to third floor level and then allow Steelwork contractor: The college currently has two sites - 406mm diameter CHS columns, as they will the concrete contractor to cast the concrete D A Green & Sons Fairfield Road and Barclay Road - and remain in full view,” explains Sean Clark, floors,” he adds. Steel tonnage: 450t it is at the former that the work is being Contract Manager for D A Green & Sons. “So The final two floors were then erected Project value: £12M undertaken. Consisting of both new build we had to procure them in complete lengths with lightweight cherrypickers working off of and refurbishment, at the heart of the project and the majority of them are nearly 20m the completed concrete slabs. is a six-storey glazed rotunda, which will long.” The rotunda actually features three incorporate the new entrance to the College. Bringing such large steel sections to site rows of CHS columns, with the perimeter The predominantly steel framed rotunda was a delivery and manoeuvring challenge, as members being slightly shorter and ending includes a double-height space below ground the site is surrounded by busy roads, and the at the fifth level, while the remaining two level, which will house drama studios and rotunda’s access is severely restricted by the internal rows extend upwards the full 19.8m music practice rooms. The ground floor will college’s existing buildings. to form the top floor and roof. The perimeter house the entrance hall, while the upper Once the steel was on site, the CHS columns are shorter as the uppermost part of levels will provide light and spacious offices columns and the tight site, dictated the build the structure steps back to form a balcony. with circulation areas and glazed walkways programme for steelwork contractor D A Because of the amount of exposed CHS (linking into the existing adjacent building). Green. As the perimeter columns were im- steelwork and the fact that the perimeter The double-height basement zone is mediately erected to full height (using tem- will be fully glazed, the project engineers concrete framed and above it there is a porary restraints), the rest of the rotunda’s had to figure out where to put the stability- concrete transfer structure supporting the steelwork was erected around these sections. giving bracing. The perimeter façade was The completed rotunda (1) will house a new entrance hall (2) and the structure features CHS columns (3) which will remain exposed 1 2 3 16 October 10NSC


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