Tower Landesgartenschau Wangen

Building design
Embedded in the impressive landscape of the West Allgäu, the Wangen Tower is an architectural landmark and a pioneering timber construction for the 2024 State Garden Show. Photo: Roland Halbe

Nestled in the impressive landscape of the West Allgäu, the Wangen Tower is an architectural landmark and a pioneering timber construction for the 2024 State Garden Show. Photo: Roland Halbe

The 23-metre-high observation tower on the grounds of the 2024 State Garden Show in Wangen im Allgäu is an architectural highlight and landmark that was designed and built by the University of Stuttgart.

The Institute for Computer-Based Design and Construction (ICD) at the University of Stuttgart is known for innovative buildings that use state-of-the-art digital planning and production technologies. The tower is an impressive example of innovative architecture created using computer-based design methods.

The observation tower consists of twelve load-bearing, curved cross-laminated timber segments, which together form a surface-active timber structure. This construction not only makes it possible to effectively bear the horizontal wind loads, but also gives the tower additional stability. Inside the tower, a centrally positioned staircase spindle ensures that the vertical traffic loads are safely absorbed.

Particularly impressive is the use of local spruce wood, which is automatically formed into the desired shape through moisture-induced shrinkage. Inspired by natural biological models, this shrinkage of the wood is not seen as a disadvantage, but is used specifically as a design tool. During the controlled drying process, the moisture content of the wood decreases, resulting in the specified target curvature and giving the tower its characteristic shape.

The cross-laminated timber (CLT) used was manufactured using a special process consisting of double-layer panels. These boards consist of a 30 millimeter thick “active” layer and a cross-laminated, ten millimeter thin “restrictive” layer. The “active” layer, which has a higher moisture content, is glued to the “restrictive” layer in a flat vacuum press. After this lamination process, the flat panels undergo a precisely controlled drying process in which the “active” layer shrinks perpendicular to the fiber direction so that the panels bend themselves into the calculated shape. Finally, three of these curved double-layer panels are overlapped and bonded with an elastic barrier layer to produce stable, dimensionally stable and precisely curved CLT blanks.

Thanks to the use of state-of-the-art CNC milling technology, the digital model of the tower could be transferred directly to the wooden components. This optimized both the statics and production, while at the same time significantly reducing material waste. The twelve main components and the 168 larch wood panels for the façade were pre-assembled on site, allowing the tower to be fully assembled in just three days.

This innovative construction project was realized by a team from the Cluster of Excellence “Integrative Computer-based Design and Construction for Architecture” (IntCDC) at the University of Stuttgart. The team consists of experts who are characterized by their interdisciplinary cooperation and in-depth knowledge in the fields of architecture, engineering and digital manufacturing.

The Institute for Computer-Based Design and Construction (ICD):
Prof. Achim Menges
Martin Alvarez, Monika Göbel, Laura Kiesewetter, David Stieler, Dr. Dylan Wood
with the support of: Gonzalo Muñoz Guerrero, Alina Turean, Aaron Wagner

Institute of Structural Engineering and Structural Design (ITKE):
Prof. Jan Knippers
Gregor Neubauer

Blumer-Lehmann AG:
Katharina Lehmann, David Riggenbach, Jan Gantenbein
with Biedenkapp Stahlbau GmbH
Markus Reischmann, Frank Jahr

City of Wangen im Allgäu:
State Garden Show Wangen im Allgäu 2024

Other project participants:

Scientific cooperation:
Professorship for Forest Utilization Prof. Dr. Markus Rüggeberg, TU Dresden

Other consulting engineers:
wbm Consulting Engineers
Dipl.-Ing. Dietmar Weber, Dipl.-Ing. (FH) Daniel Boneberg

Collins+Knieps surveying engineers:
Frank Collins

Schöne Neue Welt Ingenieure GbR:
Florian Scheible, Andreas Otto

lohrer.hochrein Landscape architects DBLA

Building permit:
Test engineer: Prof. Hans Joachim Blaß, Karlsruhe
Experts: MPA Stuttgart, Dr. Gerhard Dill Langer, Prof. Dr. Philipp Grönquist

Cooperation for foundation:
Fischbach construction company

Project funding:

DFG German Research Foundation

Zukunft Bau – Federal Ministry of Housing, Urban Development and Building / BBSR

Discover the observation tower at the 2024 State Garden Show in Wangen im Allgäu and experience for yourself the extraordinary architecture and advanced technologies that make this building a masterpiece.

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The Museum der Moderne will be expensive. Very expensive. But what is scandalous is not that the budget was approved. But how it was approved. Here is the opinion of architecture critic Falk Jaeger.

Herzog & de Meuron’s Museum der Moderne has been criticized from all sides for years: it is far too expensive, the design is not appealing and the visual axis between the National Gallery and the Philharmonie is being obstructed. Now the budget committee of the German Bundestag has approved the cost plan for the project. How can it be that politicians are ignoring all the facts and public objections and approving the exorbitant cost plan for a new museum, while the other buildings of the Prussian Cultural Heritage Foundation have long been in need of renovation?

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Rarely has a public building project in Germany provoked so much headwind as the Museum der Moderne. A shitstorm, you could almost say, if the contributions to the discussion were not of a serious nature. “The most expensive crusty bread in the world”, was the headline in the FAZ, referring to a metaphor used by jury chairman Arno Lederer. “This barn is a scandal” was the headline of another FAZ article, a scathing all-round attack that scandalized the location, architecture, size, environmental aspects and costs in equal measure.

Some points of criticism even overshoot the mark. The castigation of the sacrilegious proposal to block the line of sight from Mies van der Rohe’s Neue Nationalgalerie to Scharoun’s Philharmonie (nicely illustrated by Stefan Braunfels in another polemic) is an all too superficial, silly stop-the-thief argument. Of course, a new building in this location would interrupt the view, but Scharoun had already planned it that way in terms of urban development, and Mies had to assume this in his planning.

Why would the view be so indispensable? If you want to see the Philharmonie, you can just step outside the door. In the beginning, when the Tiergarten was still free of trees due to the war, you could even see the Brandenburg Gate from the Neue Nationalgalerie, so what the heck.

The Tagesspiegel described the situation as “eyes closed and through”, and was right: the budget committee of the German Bundestag approved another hefty gulp from the taxpayers’ purse for the Museum der Moderne, thereby imposing a voluntary commitment for future increases in building costs from 364.2 million to a forecast 450 million euros. It certainly won’t stay at that, it’s more likely to be 600 million. But then the project will be under construction and there will be no turning back.

Dependence on private donors

The real scandal is how the Minister of State for Culture, Monika Grütters (CDU), has pushed through her personal “Grand Projet” against the most diverse reservations in the backrooms of politics. The political caste is making up its own mind about the project. Facts, pragmatic considerations and public opinion play no role. Perhaps the highly controversial architecture of the Museum der Moderne (“barn”, “ALDI discount store” etc.) would not have been a sufficient reason for a rejection, after all it was the result of a competition with a prominent jury. However, the urban planning problems, the reduction in the floor plan with the consequence of the expensive, difficult-to-calculate lowering into the extremely problematic Berlin building ground, should have given the housekeepers food for thought.

It is also annoying to see the submissive dependence on some private donors who had threatened to move their collections elsewhere. This is due to the fact that the foundation can hardly organize its own major projects, internationally attractive exhibitions, and is dependent on partners who are willing to pay.

Too many building sites

The Prussian Cultural Heritage Foundation is constantly being “gifted” new, magnificent museums by the federal government, which then have to be used and maintained. However, there are already decades of renovation backlogs at the existing houses. In addition, there is inadequate funding for qualified specialist staff and a pitiful acquisition budget of 1.6 million for all museums. None of this fits together.

The Foundation should finally be consolidating. Instead, the Humboldt Forum in the palace replica is to be brought back on track in 2020, the general renovations of the Pergamon Museum, the New National Gallery and Scharoun’s State Library are devouring huge sums of money and so on…

It’s no wonder that Berlin looks longingly at the popular major exhibition events in Paris, London, Amsterdam and New York. We want to play in that league too, we want to have something like that here again.