Bau des Main Towers.

A high rise with depth

Even for experienced structural engineers, every skyscraper is a challenge. That was also true of the MAIN TOWER. With its innovative construction, the high-rise building is a technical masterpiece.

Whereas the outer walls in many high-rise buildings are designed to be load bearing, the vertical load on the MAIN TOWER is borne by the core structure and exterior supports. This was the only way to realise the fully glazed façade. However, just like every skyscraper, the MAIN TOWER also started its life by growing downwards. After the base plate made from reinforced concrete of up to 3.8m thickness had been cast, the building was simultaneously constructed upwards and downwards using the so-called top down method. At times, a new floor was constructed every four days.

The MAIN TOWER weighs a total of more than 200,000 tonnes, making it some twenty times heavier than the Eiffel Tower in Paris. But with its 112 foundation piles (diameter of 120 to 180 cm), which extend 50 metres into the ground, it is firmly rooted in Frankfurt’s soil.

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