The straightening of the sectional beams is provided by a hydraulic press. Well-known manufacturers are Stierli-Bieger (Switzerland) and Voortman (Netherlands).
Both manufacturers have high quality and a good service. As an example you see below a used hydraulic straightening press from Stierli with max. 2000 kN operating pressure. This pressure is suitable for bending and straightening HEA 600 profile steel.