METHOD AND APPARATUS FOR MANUFACTURING A SERIES OF ELONGATE PRESTRESSED CONCRETE CONSTRUCTION ELEMENTS

摘要

METHOD AND APPARATUS FOR MANUFACTURING A SERIES OF ELONGATE PRESTRESSED CONCRETE CONSTRUCTION ELEMENTS Method and apparatus for manufacturing a series of elongate prestressed concrete construction elements are disclosed. Prestressed reinforcements are positioned above and along an elongate moulding area provided with heating means. The reinforcements are then tensioned. A portion of each element is moulded by pouring concrete into a moulding assembly positioned about the reinforcement, the moulding assembly being moveable along the moulding area and having a front wall and a retractable rear wall arranged across the moulding area and a series of mutually parallel formers extending along the moulding between the front and the rear walls to form a series of moulds. The poured concrete is then vibrated and the rear wall of the moulding means is retracted. The moulding assembly is moved along the moulding area to leave behind moulded portions of the elements. Successive portions of each element are moulded in the same manner until a desired length of element has been obtained. The elements are then heated to harden the concrete, and the tension in the reinforcements is released.