Method and apparatus for producing prefabricated components from pretensioned prestressed concrete

US5439629A · kind A · utility

Assignee

• Dyckerhoff & Widmann Aktiengesellschaft · DE

Inventors

• Joachim Heintz · Gräfelfing, DE
• Peter Auer · Ottobrunn, DE
• Helmut Lieske · Munich, DE
• Peter Plica · Munich, DE

Key dates

• Filing date: Dec 23, 1993
• Grant date: Aug 8, 1995
• Expiry date: Dec 23, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B28B23/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for the manufacture of pretensioned prestressed concrete sleepers wherein, the tensioning wires are taken directly from one or more rolls of wire and are introduced in a longitudinal feed into a tensioning frame, and the tensioning wires (5) are initially anchored at the end thereof located at the front in feed direction. The wires are tensioned by a tensioning device arranged outside of the tensioning frame and resting against the opposite end thereof, and the wires (5) are anchored at the tensioning device; only then are the wires severed by means of a severing device. In this manner, it is possible to combine in a single station the operating stages of cutting to length, introducing and tensioning the wires, which stages in the past were distributed over several manufacturing stations, so that the labor intensive and time consuming manipulation of wires which have been previously cut to length is eliminated.