Project: City hospital, Horb, Germany
Contractor (and Architects): Baugeschäft Dieterle GmbH & Co. KG, Schramberg, Germany
Formwork Engineering: MEVA Schalungs-Systeme GmbH, Haiterbach, Germany
This inner-city project involved modernising and extending a hospital in the city of Horb, south western Germany. The basement will house a linear accelerator requiring very thick walls and slabs to hermetically seal the accelerator room and keep the radiation inside. Cramped inner-city conditions and working on slopes made the task a real challenge.
What is Barite concrete?
That’s a concrete mixture with barite as a heavy additive with a raw density of 4,000 to 4,300 kg/ m³. It is often used in buildings that house X-ray plants and for radiation protection in medicine and research. To optimise the protective function of such buildings, the concrete is poured in exceptionally thick walls and slabs.
Walls and slabs up to 1,90 m thick
The room housing the linear accelerator has walls that are 3,79 m high and between 1,50 m and 1,65 m thick. The slabs are up to 1,90 m thick. The viscous barite concrete required the use of a special pump. The ties were left in the pour and the openings sealed to ensure a hermetically sealed result. The slabs were formed using MevaFlex formwork with H20 beams supported by ME 350 props to carry the heavy loads.
Mammut 350 and support Frame STB 450
Walls and foundations were poured using the strongest available wall formwork – the Mammut 350 with a load capacity of 100 kN/m². It allows a free pour rate up to a height of 4 m. Single-sided wall formwork was supported by frame STB 450 to a height of 4,50 m. With its base width of only 2,45 m, the support frame was Slim enough for the cramped conditions.
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