For particularly high traffic loads of 25 kN/m² and more (e.g. with wide-span multi-storey car park ceilings), so-called π panels or π ceilings are used. (also TT blanket)
Schematic drawing: π slab - baukobox
When using π panels without prestressing, large spans of up to 17.5 m can be achieved with a slab height of 920 mm, with prestressing the maximum span (with the same ceiling height) increases to a total of 20 m.
Isometry: π slab - baukobox
Single-axis tensioned π panels act as single-span beams and therefore do not require any assembly support. Slabs with π slabs can be produced with and without an in-situ concrete supplement, although it should be noted that in the case of an in-situ concrete addition with locally added reinforcement, the overall cross-section is statically effective and acts as a stiffening disc.
Image: TT ceiling in the installed state - Vollert Anlagenbau GmbH
For
example, semi-prefabricated beams with lateral hinge brackets can serve as supports for the π slabs, the support is carried out on elastomer bearings and is also designed in the final state with cast-in-place concrete addition to be freely rotatable/movable by only supplementing the cast-in-place concrete in the mirror area. Statically, a rigid connection does not make sense here, as the bars are overstressed as a pressure zone in the case of force-fit grouting
in the case of force-fit grouting baukobox.de
