Product / system manufacture
Product / system supply
David Morley Architects
The Racquet Centre sports complex of the Hurlingham Club in Fulham includes four indoor tennis courts and four squash courts within a 35m wide x 55m long hall.
The complex was designed by David Morley Architects and has a sunken low-profile shape and a curved green sedum roof to minimise the environmental impact of the building.
The main span of the building consists of suspended steel beams. To give the courts space and reduce the cost of these complex beams, they are placed with large gaps of 12.9m. To fill these gaps, the architect wanted to use wood. Moreover, the construction needed a solid sound absorption coefficient to reduce reverberation in the hall.
The Kerto® LVL elements needed to function as acoustic panels and also function as an efficient, lightweight solution for the wide span of the building.
The Kerto-S LVL ribs are 600mm high, and the top plate is a 25mm Kerto-Q LVL panel. The bottom plate was made of a 20mm Kerto-Q LVL. However, this is a special configuration of Kerto-Q LVL called SONANS acoustics panels (perforation dia 10 @ 20mm), with 50mm of acoustic insulation internally within the panel allowing a high absorption coefficient required in the tennis hall (sound absorption coefficient: αw = 0.75- class C).
The architect and principal engineering office, Price & Myers, decided that a traditional laminated timber, combined with a solid wooden panel on top, was found to have a height of 1200mm for the beams, which was much too high.
The engineers at Price & Myers contacted Metsä Wood to look at a design with a shallower construction for the roof that would still accommodate the large span and heavy green roof. Following a joint design effort, they agreed a roof design with Kerto-Ripa elements. These elements are made from Kerto LVL using structural gluing. With any other material, trusses would have had to be more densely spaced.
The Kerto-Ripa elements constitute the vaulted roof construction are 12.9m long and have a total height of 645mm and maximum width of 1200mm. To accommodate the curve of the structure four different widths were determined - 550, 600, 700 and 1200mm - totalling 140 prefabricated Kerto-Ripa elements. The roof elements fit flush with the vaulted, spaced, bowstring steel truss. To get the steel element the same depth as the Kerto-Ripa elements (645mm), the steel manufacturer was heavily involved.
With the arch in the roof, the supports and the installation process had to be considered at design stage in order to avoid problems during the erection of the roof.
The contractor, architect, engineers and steel manufacturers collaborated closely to find the best solution and the connection detail between the Kerto-Ripa and the steel element had to be very carefully designed.