The Danube Tower in Vienna
DOI:
https://doi.org/10.3989/ic.1965.v17.i169.4396Abstract
The symbolic tower of the horticultural exhibition, held recently in Vienna, is a 260 m high structure made of reinforced concrete. Of the total height, 181 m constitute the stem, and the rest is made up of a metallic needle. Inside the tower there are two lifts, each with capacity for 15 people, and a travelling velocity of 6.5 m/sec. In the top 31 ms of the stem there are two terraces, a bar and a restaurant: they provide a wonderful view of the city and the surrounding district. The vertical outline of the stem is an arc of a parabola. A sliding formwork has been utilized for its construction, and a height of 4 m has been concreted every day: this has meant a movement of 25 cm of the formwork every hour. The tower has a weight of 17000 tons, which imposes large loads on the foundation. To withstand these, the foundations have been made in the form of a truncated cone, with a cylindrical hollow core. The base of the cone has an external diameter of 31 m, and an internal diameter of 10.20 m. A compression hoop strengthens the joint between the foundation cone and the stem itself. Although this tower is located in the centre of the city, it harmonizes very well with the surrounding buildings.
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