Hollow formwork elements for producing concrete structures

US3973749A · kind A · utility

Assignee

• SEMPERIT AKTIENGESELLSCHAFT HOLDING · AT

Inventors

• Franz Friedl · Marktoberdorf, DE
• Erich Kohler · Ternitz, AT
• Hans-Joachim Höller · Moitzfeld, DE
• Franz Gebauer · Wien, AT

Key dates

• Filing date: May 22, 1974
• Grant date: Aug 10, 1976
• Expiry date: May 22, 1994

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E04G11/045
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The present invention relates to reusable hollow formwork elements of elastic material which may be used for the concreting of pipelines, and which by filling with a gaseous or liquid medium, can be given compressive resistance. The invention also relates to a method of operating such formwork elements.