Sustainability, pure nature and a perfect view – this is what the Entrup viewing tower in the district of Höxter (East Westphalia) offers.
The new attraction, which also lies on a cycling adventure route, promises real closeness to nature and a great all-round view. The 24-metre-high and 45-tonne wooden structure has seven floors and a nine-metre-high telegraph unit on its roof. The tower took just eight weeks to construct. This was made possible by, among other things, prefabricated elements that were assembled and erected right on the construction site. The building is protected against the wind by veneer timber boards screwed on with 8x140 stainless steel SPAX. Thanks to the use of sustainable materials and structural wood protection, the tower fits perfectly into the green environment.
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„We used SPAX screws to anchor the ribs of the edge beams while prefabricating the corrugated wall elements. When it came to the load-bearing structure, we preferred to use screws in which we had already previously placed a huge amount of trust. So it was an easy decision for us to choose SPAX.“
Sigbjørn Daasvatn, Project Manager, Trebyggeriet AS
The complete timber construction work will be carried out by Ingenieur-Holzbau Cordes in cooperation with Merk Holzbau (rails) and Intamin of Switzerland (drive system) – as was the Colossus ride at Germany's Heide Park Soltau fun park. This roller coaster is also being designed and calculated by Ingenieurbüro Stengel in Munich.
For the first time, SPAX full-thread screws (8x300 mm) are being used as “transverse reinforcement” in accordance with general technical approval Z-9.1-519.
Unavoidable cracks and splitting of the wood in the area of the round press-fit dowels can lead to a reduction in the load-bearing capacity of the wood. To counteract this, these screws reinforce the wood perpendicular to the grain in the direction in which the wood naturally has the weakest strength properties. In addition, the measure is expected to produce many small cracks and not one large one, which has a positive effect on the load-bearing behaviour.
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