VT fold
VT folds (abbreviation for prefabricated, trapezoidal folded girders ) are part of a large roof structure made of prestressed concrete . They are characterized by a trapezoidal cross-section that remains constant over the entire length and is open at the bottom (hood shape). VT folds can span large spans of up to 24 meters and are characterized by load-bearing capacity, stability and variability.
history
The VT-fold was developed in the 1960s at the Institute for Reinforced Concrete in Dresden by the civil engineers Eberhard Kühn and Karlheinz Weißbach. On the basis of lightweight, economical construction, they constructed a roof structure that combines extensive and space-enclosing functions and has a very low dead weight so that it can be prefabricated and transported well and is economical in the use of steel and cement. With a length of 8 to 25 m and a span of 18 to 24 m, the VT fold is only 8 cm thick. The dead load is between 1.62 and 1.86 kN / m² (165–190 kp / m²). The VT folds were initially manufactured in VEB Betonwerke Dresden, Ottendorf-Okrilla branch. In 1970 the growing demand led to the establishment of further production facilities in the GDR districts of Leipzig, Erfurt, Magdeburg, Potsdam and Rostock.
Buildings
The first structure with a VT folding roof was installed in 1967 on the test site of the Institute for Reinforced Concrete in Dresden. It served as a permanent stand for long-term testing. In 1968, the first dining room in Porschdorf near Bad Schandau and a single-nave production hall in Meißen with a floor space of 1700 m² were roofed over with VT folds. The first swimming pool with a VT folding roof followed in Dresden in 1969 (Steinstrasse swimming pool).
In the 1970s, numerous single-storey multi-purpose buildings with a VT folding roof were built throughout the GDR: in addition to storage and production halls, garages, and dining and event halls (including restaurants and clubs), above all swimming pools, gyms and department stores. A prominent example is the Fischerinsel swimming pool in Berlin-Mitte, which was built in 1979 and extensively renovated in 2009. The architectural office Veauthier Meyer Architekten received the characteristic roof design with the VT fold out of respect for the building modernity of the GDR and applied the necessary insulation to the filigree roof in such a way that its elegance was retained.
literature
- Herrmann Rühle, Eberhard Kühn, Karlheinz Weißbach, Dietrich Zeidler: Spatial roof structures. Construction and execution . In: Volume 1 Concrete, Wood, Ceramics . Publishing house for construction, Berlin 1969.
- Eberhard Kühn, Karlheinz Weißbach: Development of an optimal, prefabricated, wide-span spatial structure made of concrete, its introduction into practice and the general conclusions derived from it for the development of optimal, prefabricated shell or folded concrete girders - dissertation at the Leipzig University of Construction . 1970.
Web links
- gdrdesign.wordpress.com
- VT folds on Flickr
- Fischerinsel swimming pool, Berlin-Mitte . Website of av-a Veauthier Architekten GmbH.
Individual evidence
- ↑ Fischerinsel swimming pool. (PDF; approx. 688 kB) Berliner Bäder-Betriebe, accessed on December 15, 2013 .