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SERIEN STUDIERENDE ENTWERFEN ... • STUDENTS DESIGN ...

In einem Workshop vor Ort veredelten Studierende die Oberflächen der Schalungselemente und bauten fehlende Passtücke. • In an on-site workshop, students refined the formwork elements and built missing fitting pieces.

Schalungselement auf der Baustelle von Stuttgart 21 • Formwork element on the Stuttgart 21 construction site Der Pavillon im Bau — noch ohne Außenhülle • The pavilion under construction - still without an outer shell

A t the construction site of the new Stuttgart Central Station (the Stuttgart–Ulm rail cal outer shell made of solid structural timber, timber boarding and three-layer panels,
project, known as “Stuttgart 21”), geometrically complex concrete formwork made of simplifying the construction of roof and façades while protecting the reused formwork
cross-laminated timber was used for chalice columns, skylights, vaults, tunnels and edge elements. At the same time, the envelope becomes an integral part of the architectural
connections. After concreting, these bespoke elements were not reused but disposed of staging: the spectacular geometry and timber surfaces of the former Stuttgart 21 formwork
as special waste – an end-of-life scenario that neither reflects the material’s quality and is revealed only upon entering the building. The construction process itself was remarka-
performance nor the geometric sophistication of the formwork components. The interdis- ble: Mayor Simone Lehnert succeeded in mobilising broad local support and numerous
ciplinary research project Stuttgart 210, led by the universities of Stuttgart, Konstanz and volunteers, including regional craftspeople.
Karlsruhe in cooperation with proHolz, Züblin Timber, Ed. Züblin AG and funded by the
Ministry for Rural Areas of Baden-Württemberg within the Timber Construction Initiative, From free design to concrete use and implementation
explored ways to preserve and upcycle these temporary construction aids by reusing
them as primary structures in new buildings. Key parameters for building with reused Under the direction of Prof. Andreas Kretzer, Roman Kreuzer, Katharina Raabe and Maximi-
components were investigated in real-world laboratories and tested in pilot projects. The lian Stemmler, more than forty German, Indian and Turkish master’s students in Interior
first pilot, a youth pavilion on the River Neckar, was realised in cooperation between HFT Architecture prefabricated and assembled the oval spruce shell. During a two-week inter-
Stuttgart and HTWG Konstanz. The municipality of Ingersheim, north of Stuttgart, applied national workshop, they refined formwork surfaces, produced fitting pieces and comple-
to implement a design in 2023. Large, highly complex formwork elements were available. ted missing elements. The municipality, local associations and volunteers supported with
While they allowed the creation of a sculptural interior space, they were not suitable for accommodation and catering. The Würth Group contributed through substantial donations
forming a coherent external envelope. The design therefore adds an autonomous ellipti- of screws and safety equipment, while Häfele hosted a mid-project event at its Stuttgart

052 • AIT 4.2026