Home Сonstructive reinforced concrete Hollow core floor slabs

Hollow core floor slabs

Kovalska ICG produces a wide range of floor slabs by applying the extrusion method on the up-to-date technological line for the off-form slab formation manufactured by Nordimpianti System S.r.l. (Italy). These are multi-cavity prestressed slabs made of heavy concrete by applying the method of continuous long-line extrusion process*. Hollow core floor slabs may be used to arrange load-bearing structural floor and roofing elements of buildings and structures for various purposes. Slabs manufactured by applying the extrusion method are used in construction of residential and industrial facilities with load-bearing walls made of bricks or blocks, as well as in frame or frame and monolithic structures to cover spans of up to 20 m inclusive. They are an alternative to slabs manufactured by applying conveyor-type production method or conveyor technologies. Slabs are made with a height of 200, 220, 265, 320, 400 and 500 mm, and a width of 550, 750, 950, 1100, 1350 and 1500 mm with a height of 220 mm. Slabs with a height of 200, 265, 320, 400 and 500 mm can be made with a width of 1200 mm, or shortened in width according to an individual order.

Special features

*Extrusion (pushing out) is the technology of manufacturing reinforced concrete products by forcing concrete mortar through forming holes. In lifting and carrying out erection operations without lifting hooks, special traverses with clip-on chucks are used.

  • Slabs are manufactured from heavy concrete in compliance with DSTU B.V.2.7-43-96, average density from 2200 to 2500 kg/m3 and strength category to pressure from В30 to В50. Slab length depends on their thickness and maybe the following:
  • Figure 1. Thickness 220 mm: from 4,0 m to 11,0 m
  • Figure 2. Thickness 320 mm: from 8,0 m to 15,5 m
  • Figure 3. Thickness 400 mm: from 10,0 m to 18,5 m
  • Figure 4. Thickness 500 mm: from 12,0 m to 20,0 m
  • Design thickness of the slab – 1200 mm.
  • Characteristic values of uniformly distributed temporary loads on slabs (excluding own weight of slabs), depending from their length and thickness, is ranging from 250 to 2000 kg/m2. In lifting and carrying out erection operations with loopless slabs, special traverse with clip-on chucks must be applied (Figure 5)