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CASE STUDY 25


re-erection of the frames.” Prefabrication was a necessity, as access around the facade was very limited and facade installation was to run concurrently with the frames’ reinstallation. The curvature of the facade also presented challenges, particularly for the system of unusually high 4 metre shutters: “We had to disregard a traditional system of hung panels because it would be expensive and difficult to achieve around a curve. “The answer was to keep the control mechanism in a straight line and use support brackets with varied lengths. These would set the shutters at an appro- priate distance away to appear to follow the curve of the building.” To provide a smooth and robust action for the panels, it was necessary to control both the top and bottom at the same time. “We decided to fabricate this as a whole unit, including frame, motor, gearbox and four panels running on ‘trolleys.’ This avoided building a complicated system on site.” The frames were craned into place, with each tested over five cycles after installation.


The facade is manufactured with aluminium thermally-broken extrusions, with triple glazing or non-combustible insulation. Aluminium panels, perforated in a pattern to represent the original tide marks as gas holders expanded and contracted, are attached to the unitised system; they are movable where they are in front of the windows or balconies. Sharing the same aesthetic as the balconies above, the 5 metre entrance steel canopy (cantilevering 4 metres) displays aluminium slats, with concealed lighting to the soffit and a steel feature channel around the perimeter. Built on site, this extends through the main facade. “The canopy is held by slender steel supports and the glazed curtain walling which features bespoke steel mullions,” revealed Rob. “Although each support element was relatively lightweight, they worked in unison to provide stability to the canopy.”


ENERGY-EFFICIENT Arup has gone to great lengths to ensure that the re-envisioned gas holders are as energy-


WWW.HBDONLINE.CO.UK


The ‘drum’ shaped blocks each have a central, circular atrium around which gallery walkways give access to front doors


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