Description of parts of the structure
The base of the sculpture is formed as the inner side of a spherical cap, the sphere having a diameter of 110.8 metres. Thus, on the basis of a level building site, about 7,000m3 of earth had to be excavated. About 14,000 m3 of filling had to be added.
A damp course has been formed under the asphalt base by laying down a 15cm layer of shingles. The drain pipe system is constructed as a percolation drain, which is led to the municipal rainwater system.
The steel dome is supported partly by four steel pillars and partly by the circular continuous footing.
The curved surface of the sculpture is fabricated from 5-6mm sheet steel which is stiffened with rolled IPE 360 profiles (radial) and HE 140 A profiles (circular). The staircase is also constructed of 5-6 mm sheet steel.
The pillars were prefabricated in a factory. Each pillar has a diameter of 2m at the base and 1.6m at the top.
Each of the four pillars has a lightning conductor. The lightning conductors are connected to a common earth which is integrated into the foundations of the pillars and the continuous footing.
A hollow pillar is situated in the middle of the dome. This pillar contains the machine room for the gas installation. A gas burner is located on top of the pillar, approximately 2 m under the top of the steel dome.