Set of stressing heads with a maximum stressing capacity of 600 tonnes, designed for manufacturing precast prestressed concrete beams. One active head and one passive head are mounted at opposite ends of a universal casting bed. Perforated plates on both heads allow the prestressing strands to be arranged to suit the beam cross-section and the allowable load.
The active head incorporates a movable anchorage plate and four double-acting hydraulic cylinders, each with a maximum stroke of 400 mm. Mechanical locking collars hold the plate in position during casting and curing. Once the concrete reaches the required strength, the cylinders retract together to release the strand tension gradually and transfer the prestressing force to the beam. Both heads have protective screens and enclosures around the strand anchorages.
