News

0511NSCNov05

NEWS Steel-framed hospital The last remaining section of the old Bishop’s Bridge awaits floors ‘comfortably lowered onto its permanent supportslowering and dismantling when the newly launched structure is meet vibration limits’ New tests on floors in recently- reduced from 335mm to 240mm and built steel framed hospitals have its response factor would still have demonstrated that they comfortably been acceptable. meet the NHS requirements on Dr Stephen Hicks, the Steel vibration response. Construction Institute’s Manager The tests emphatically refute for Building Engineering, said: “The an earlier study published in implications are that the floors in Concrete Quarterly which suggested hospitals don’t have to be designed composite steel deck floors would any differently from floors in buildings have to be substantially deeper for the commercial sector. On the than a flat slab or post-tensioned basis of these measurements there’s concrete floor to meet the criteria no particular need to do anything of Health Technical Memorandum special to achieve good vibration 2045. response factors.” Results, reported more fully in this The hospitals tested include the issue of NSC (page 20), show that recently completed Sunderland composite floors in four hospitals Royal Hospital (NSC June 2005). with an overall slab depth of 175mm– Dr Hicks said that the 15m x 337mm outperform the requirements 75m floor used for theoretical by a factor of between two and four. comparisons in the Concrete In a fifth, an 80mm screed could Quarterly study was not particularly have been omitted and the slab itself representative of a hospital. Artistic super bowl set to Bishop’s Bridge deck grace Durham skyline launch completed The second and final deck launch Bridge is steelwork contractor. of Westminster City Council’s new Westminster’s project manager Bishop’s Bridge has been carried is Capita Symonds and Cass out by Hochtief Construction. Hayward & Partners Hochtief’s The 74m launch was carried out superstructure designer. incrementally during nightly rail The next stage involves jacking possessions in September to get the deck down from temporary the steel deck across platforms steel trestles on to the permanent one to 10 of Paddington Station and supports. The last remaining on to its new southerly abutment. section of the old structure, a 40m Hochtief is carrying out a £32M steel Parker truss – which was bridge and road construction previously jacked up 10m clear Durham County Council has revealed proposals for Sky Bowl, a 15m diameter project for Westminster replacing of where the new deck has been steel structure and visitor attraction designed by Swedish artist Pal Svensson an old brick and cast iron structure launched – will then be lowered that would change the skyline of the city. Support has been expressed from with a wider and stronger four-span on to the new structure and taken sources as diverse as the Bishop of Durham and local trade union leaders and steel composite bridge. Cleveland away to be dismantled. an exhibition was held last month to gauge public reaction. The bowl would be constructed in weathering steel externally, with an interior of polished The new bridge was launched over platforms one to 10 of Paddington Station during night time track possessions stainless steel to reflect the sky. Each section of the outer shell will incorporate artwork from a different County Durham community. 6 NSC November/December 2005


0511NSCNov05
To see the actual publication please follow the link above