Hollow-core slabs are up to 40% lighter than solid slabs and require less concrete to manufacture. The hollow-core slab is usually laid without support and can be fully loaded immediately. Grout topping on site is no longer absolutely necessary. For these reasons, it is widely used worldwide.
Previous disadvantages
In the traditional production system, comprising a continuous casting process on long production beds, transverse reinforcements, cross connectors, built-in parts, lifting rings, tensioning steel overhang or concrete recesses cannot be incorporated at all or can only be incorporated with considerable expenditure.
Because of this, prestressed hollowcore slabs are often not permitted for construction systems in earthquake zones, or can only be used with restrictions. Also not to be underestimated are the previous scrap costs due to scrap sections produced in the cutting process. Vollert‘s innovative solution takes completely different approach in order to rid the undoubted advantages of the prestressed hollow-core slab from the disadvantages it incurs from its traditional manufacturing process.
Hollow-core slabs in a circuit
For the first time, prestressed hollow core slabs are produced on pallets in a circulation system. In this system, each hollow-core slab is produced waste-free to the precise geometry and dimensions of the desired building component.
Tensioning and additional reinforcements, cross connectors, coupling elements, built-in components and recessed placeholders are easily installed on the pallet. Hollow-core creators are only used temporarily during the concreting process. Truly earthquakeresistant prestressed hollow-core slabs can now be produced for the first time.
