The prestressed floor slabs, or ribbed slabs, are generally preferred for general structural engineering such as residential and industrial constructions, hotels, multi-storey car parks, supermarkets, etc. With span widths between 8 - 13 m.
The prestressed floor slabs are used where the loosely reinforced slabs are close to their limits, with regards to load and span width. The width, depending on the production procedure, is up to 3 m, thickness of the concrete board is 80 - 120 mm.
The longitudinal reinforcement of the prestressed floor slabs consist of bracing wire strings, for transverse reinforcement,steel bars are laid over the pre-stressing reinforcement. Depending on the slab type and the span width, the level of support work can be reduced to partial - or even deleted. The major advantage of this system is the large available span widths of the prestressed floor slabs and the minimal support requirements.
It is a lost formwork and the underside is characterized by high surface quality = it can be wallpapered or painted. Plastering work is not required, the joints between the individual slabs must be filled to create a flush finished surface.
Facts
Concrete board: normally 80 - 120 mm thick
Length: up to 15 m
Width: normally up to 3 m, depending on production technology and the transportation possibilities to the construction site
