Client: NHS Orkney
Main contractor: Robertson Major Projects
Structural engineer: AECOM
Steelwork contractor: BHC
Tata Steel products: ComFlor® 51+ and ComFlor® 60 composite floor decking
Year: 2017 (the new Orkney Islands hospital opens 2019)
The new £64m hospital and healthcare facility being constructed on the Orkney Islands will provide a state-of-the-art clinical environment for the delivery of health services, and ComFlor® composite floor decking will play a major part in helping that happen.
The main challenges the products used in the design of this hospital had to overcome were the complex shape, and, as for all hospitals, minimising vibration in key areas. The complex design was necessary to support the required clinical facilities and flows.
It comprises a two-storey structure which includes two inner circular courtyards, one enclosed by the building and one a partially enclosed horseshoe-shaped yard with an opening. A connecting hub joins the courtyards in the middle and the main hospital building is a long-curved structure.
Minimising vibration is a critical issue for hospitals, particularly in areas accommodating wards and operating theatres.
At the Orkney Island’s hospital, the operating theatres are to be located on the first floor. To minimise vibration, the designers chose a steel composite floor deck with a reinforced concrete floor slab of 300mm thick, as opposed to a more conventional 150mm in less sensitive areas.
8,000m2 of ComFlor® 51+ and 6,000m2 of ComFlor® 60 composite steel decking was used to construct the floor decks, capable of achieving the vibration criteria. ComFlor® decking is compact to transport, another positive factor for this relatively remote location.
Supporting the thicker slabs, the design also required the use of short-span heavy steel beams and two additional lines of columns, further negating the potential for vibration issues.
The use of steelwork supporting metal decking made it easy to achieve the required curves in the floor plan. ComFlor® is lightweight and easy to cut on-site compared to alternative precast flooring solutions, and by using steel the floor deck was simple and easy to install.