24 canopy-type elements (each 18 ≈ 18 m) over a rectangular area measuring 108 ≈ 72 m. Each canopy consisted of four identical hyperbolic paraboloids supported on a fixed-base tubular steel column and also braced back to the column. The areas between these canopies were closed off with triangular elements. A total of 192 elements with two basic forms were laminated by hand for thisroof. The GFRP elements were only 3 mm thick and had a glass fibre content of just 30 % in order to achieve maximum light permeability. The surfaces were lit from above, which meant that at night the whole structure was evenly illuminated. Steel frames and prestressing stabilised these large but very thin GFRP segments. A hydraulic system was used to pull the top of each column downwards and create the prestressed force. As with an umbrella, the segments are pushed outwards by the struts and tensioned. The prestressing principle makes it clear that this structure not only employs the language of tensile surface structures, it is also a very close relation in terms of its construction as well. It could have been realised in a very similar way with a fabric as well. After just three years this elegant structure was demolished and not one single canopy remained.
