The objective of this project was to create a scenic space for hosting cultural activities all year round in La Granja public park in Zaragoza. The space needed to feature a stage and a large area for the audience to be seated, with both areas being protected against inclement weather conditions.
In order to achieve this, we chose a large open space within the park and decided to build a triangular geodesic dome on it using steel tubes. We created a hemispheric structure with a diameter of 30 metres and a marquee attached to it to cover the stage.
A single-layered ETFE covering was used for this project as it is a light, transparent and resistant material.
The metallic structure is made entirely from tubular profiles with a diameter of 219 mm. It is divided into two different construction elements: the straight bars and the joints which they are screwed to.
The circular section of the bars eliminates the use of sharp edges on the structure and allows the ETFE sheet to be directly supported on the tubes without danger of it cracking or piercing.
The ETFE sheet is completely transparent and is 250 microns thick. Three large canvases are made to cover the entire structure. The largest of them is 48 metres long and 24 metres tall. The edges of each canvas are attached to the structure using aluminium tubing which is split and screwed to toothed runners.