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The Task
New sun shading equipment had to be developed and manufactured in line with the sketches of the architect, Helmut Jahn. Unlike our standard
external venetian blinds, the slats were to have different inclination
angles. The topmost slat was to be horizontal but the lower slats were to
close progressively so that the bottom slat was at an angle of 30° - 35°.
The Solution
4000 motorised external venetian blinds with perforated 150 mm wide flat
slats were used. They were installed in the double facade. A further 1900
external venetian blinds with 100 mm wide slats were installed inside the
building. A newly developed tilting tape provided the differential slat
angles required.
The sun shading drives are controlled by 1500 motor control units of
WAREMA type LON-MSE4 M230 I insalled off-centre. The annual shade
program, which calculates the progress of shade across the facade (from
adjacent buildings or from other parts of the tower itself) ensures that
the blinds only protect against the sun when it is really visible - and
the calculation is made for each individual window.
 Installation of the multi-cables
These are "de-tensioned" in every cast box.
 Connection of the external venetian blinds to the wind bracing
Nine sets
of blinds are linked vertically with each other by rods.
 Installation of the multi-functional cables into the cable conduits and cast boxes
Connections are made to the wind bracing which transfers the
wind load into the building.
The secondary facade (external)
The secondary facade (external) is suspended from cantilever arms in theupper right of the picture, as are the WAREMA external venetian blinds. The blinds are in the closed position.
 Wind-bracing and cantilever arm connections
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