Saarstahl and its wire making unit, DWK Drahtwerk Köln GmbH (DWK), have agreed to significantly increase deliveries of prestressing steels in their strategic partnership with Max Bogl Wind AG.
The wind power engineering division of German construction group Max Bögl is Germany’s market and technology leader in hybrid tower construction for wind turbines, with 4,000 units built so far, according to Saarstahl. DWK has been supplying Max Bögl since 2015, Kallanish notes.
Max Bögl has now secured its long-term supply of prestressing steel wire for the construction of modern hybrid towers. Prestressing steel wire is used to place the individual concrete sections of each tower under compressive stress, which makes wind turbines stable and resilient, Sasrststahl explains.
The upper section of Max Bögl’s hybrid towers is made of steel, while the lower section – which can be up to 120 metres high – is made of environmentally friendly concrete. The strength and quality of the prestressing steel wire are decisive in ensuring the stability of the concrete tower.
Max Bögl manufactures up to 35 individual concrete rings. To achieve the required stability, the company produces tendons and uses these to prestress the concrete tower. This prestressing is the most efficient way to transfer the high loads of the turbines through the concrete tower, Saarstahl says.
