The Tree Tower, designed by the architect Josef Stöger from Schönberg, features an impressively airy architectural structure and a unique concept for enclosing the three very old, up to 38 m tall fir and beech trees in the egg-shaped tower. 16 arched glued laminated timber girders (GL28c larch), each over 40 m long, support the 17 t look-out platform.
The glued laminated timber beams were positioned axisymmetrically with an angle difference of 22.5° each to form an egg-shaped spatial structure. The ascent to the look-out platform takes place via a 460 m long and 2.5 m wide spiral structure made of wood, which ensures that visitors with wheelchairs or strollers also have accessibility all the way to the top. Diagonal steel rods, bracing crosses and ring structures help to reinforce the tower. The complete reinforcement system was mounted to the back of the wooden arches and protected with continuous sheet metal to protect the tower against moisture due to its exposure to the elements. Since opening on 8 September 2009, the Tree Tower has become a huge attraction and has exceeded all expectations.
