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Prosta Tower, Warsaw, Poland
Filigree reinforced concrete net shapes and supports office tower
It´s not the 70 m height and shape that makes the Prosta Tower unique – it is the front of the building consisting of glass and a reinforced concrete structure comprising individual diamond-shaped sections in a perfect architectural concrete finish that characterizes the appearance of the office block. The delicate, forward and reverse-inclined concrete facade has been installed in the form of a net over the external glazing – in addition, it serves as a structural component.
Architectural and logistical challenges
The challenges for the Warbud construction team on the one hand included ensuring that the form of the complicated concrete structure was accurately realised in spite of the high degree of reinforcement as well as having to take into consideration a formwork pressure of 90 kN/m² – as well as achieving a perfect surface finish with no tie points. On the other hand, the inner-city location with no available storage space as well as the resulting site facilities with only one crane, meant that detailed site logistics operations were required to suit the construction progress. Furthermore, the floor plans along with the cross-section of the reinforced concrete structure changed repeatedly from floor to floor.
Well-matched
By means of test assemblies for constructing reference structures, the architectural concrete team coordinated the detailed combination of formwork, scaffold and concrete technology in advance. A subsequent surface treatment could therefore be avoided.
Special formwork from system components
For millimetre-exact shaping of the structure, project-specific box outs were used. The basis for this was formed by rentable system components such as steel walers, heavy-duty spindles and standardised connecting means. The special formwork elements were completely pre-assembled at the PERI formwork assembly hall in Warsaw and subsequently delivered ready-to-use to the job site. All the in total 28 elements required for the standard and special cross-sections were equipped with a specially-designed striking mechanism. As a result, striking could be carried out without any damage to the formwork and concrete structure. In addition, the PERI concept for the internal formwork took into consideration the massive reinforcement connections at the height of the floor slabs.
Formwork + scaffolding = complete solution
A continuously extended working scaffold in line with the building progress on the basis of the PERI UP Rosett modular scaffolding system supplemented the PERI complete solution. The scaffold construction fulfilled two purposes here: it served as a supporting structure for the respective topmost working level as well as facade scaffolding for the subsequent assembly work.
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| PERI Systems In Use |
Fin-Ply Maxi
TRIO
PERI UP Rosett
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Press Release, August 3, 2011
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