Project: New Stuttgart Trade Fair Centre
Contractor (and Architects): Joint Venture: Parkhaus Los 8, Wayss & Freytag, Baresel u. Donges Stahlbau
Formwork Engineering: MEVA Formwork-Systems (Haiterbach), MEVA Formwork-Systems (Stuttgart branch)
The Stuttgart region is one of the world's most dynamic economic areas and is among the most important locations for the German and European key industries. Since the old Stuttgart trade fair centre has reached its limits in terms of space and infrastructure already years ago, the demand for modern fair grounds evolved which can host exhibitions of international ranking. The Projektgesellschaft Neue Messe GmbH has been commissioned by the state of Baden- Württemberg, the state capital and the Stuttgart region with the planning of the New Trade Fair. In September 2004, the ground-breaking ceremony was held for this “Mammoth“- project in which also MEVA systems will be applied.
The New Trade Fair is a 806 million Euro project of which 600 million will be spent for construction works. After only some record-breaking 31 months the New Trade Fair is planned to start operations in April 2007, with eight new halls and a total space of 100,000 sq. m. Some 6,800 parking spaces will be constructed on various lots on the site. Currently the biggest construction site in Germany, it stretches across two kilometres along both sides of the autobahn A 8, which goes from Stuttgart to the airport and further on to Munich. An impressive sight is offered not only by the jungle of tower cranes but also by the giant steel construction of the parking garage. Two parallel steel structures – called “Southern and Northern finger” – later will provide space for 4,000 cars and will also serve as a bridge for pedestrians and cyclists. The up to 440 m long “fingers”, which were built by a timed shifting method, span the autobahn without any piers. The total floor space of the garage covers an area equal to 15 soccer pitches, for which 13,500 tons constructional steel, 7,500 tons reinforcement steel and 38,000 cubic meters concrete were consumed. The order for this project was placed with the consortium “Arge Parkhaus Los 8” consisting of Wayss & Freytag, Baresel and Donges Stahlbau. They decided to use MEVA systems for the in-situ concreting of the two spindle buildings on the Eastern side of the garage.
The exit lanes are on theinner spindles. Due to small radii, steep longitudinal slopes (up to 12.35 %) and changingtransversal slopes in the transit areas between ramp and parking decks it was necessary to use a really flexible and easily adaptable slab formwork. Therefore, the contractor decided in favour of MevaFlex. For higher floor heights the MEP shoring system was applied for load transfer, whereas the same superstructure as for the MevaFlex could still be used. So, a quick adaptation to changing geometries, floor heights and slab thicknesses was accomplished in an economical way.
The ramp slabs of the open outer spindles for the entry lanes required an exceptional formwork solution because the longitudinal slope varies up to 11.43 %, whereas the typical transversal slope is 10.33 %. The different transversal slopes at the top and bottom of the cantilevered ramps result in a reduction of the required slab thickness from 68 cm to 22 cm. After a good deal of thought and cost estimation the contractor chose to use custom table forms. The required slope and curvature of the tables was achieved by using a tilting plate between the forked prop heads and the steel stringers which allowed a movement of the superstructure in each direction. The tables were built from pre-assembled superstructures mounted to pre-assembled MEP-towers. They only needed to be assembled once and were later adjusted in height with MEP-spindles and “understacked” extension pieces. This considerably reduced the forming time on site. Tensioning chains were used to connect the superstructures and the towers in a way that tensile strength was guaranteed. A suchlike complicated geometry reveals that a systematic formwork solution with a high proportion of rentable standard items not only demands for highly adaptable equipment but also for the expert knowledge and creativity of the MEVA engineers.
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