H = 200 mm
H = 265 mm
H = 400 mm
H = 220 mm
H = 320 mm
Plant “Oberbeton” produces pre-stressed hollow core slabs height of 200 mm, 220 mm, 265 mm, 320 mm and 400 mm. Width across the lower edge is 1200 mm (-5 mm). Length is determined by the customer in accordance with the project and can be up to 19 meters.
Hollow core slabs are manufactured by extrusion. As main reinforcement used high-strength ropes K-7 with a diameter of 9 to 15 mm. Number and diameter of rope needed for the production, determined by the type of hollow core slab reinforcement, depending on operational load.
Fire resistance of reinforced concrete floor slab is: height 200 mm and 220 mm – min 60 minutes, height 265mm, 320 mm and 400 mm – min 90 minutes, which corresponds to the fire resistance class REI 60 and REI 90 (according to DBN (Building Code) В.1.1-7-2002).
Certificates of conformity № UA1.003.0049216-13, № UA1.003.0049220-13, № UA1.003.0049221-13.
Production capabilities of the plant “Oberbeton” allow:
- Change the end rectangular cuts on oblique;
- issue slabs with different cut (depending on the bearing board or connect it with other supporting elements);
- It is also possible to produce slabs with technological holes used for the passage of various communications.
Work of overlaps as rigidity of diaphragms
The work of the hollow core slabs as a diaphragm is provided by properly designed joints. Additional reinforcement plays a decisive role here – it does not allow horizontal movement of plates, that is their joints along can perceive the shear forces.
The length of slabs bearing
Supporting joints
Compound wall connection
The longitudinal joints – are the joints between the edges of hollow core slabs and walls or beams running parallel to the overlapping. Their main function is to transfer the horizontal shear force that develops in the plane of overlapping due to the overlap as the disc rigidity.
Manufacturing tolerances
| 1. | Length (L) | ± 15 mm or L/1000 | |
| 2. | Thickness (h) | ± 5 mm or h/40 | |
| 3. | Width (b) | ||
| – The whole slab | – 5 mm | ||
| – Narrowed slab | ± 15 mm | ||
| 4. | Orthogonality of an end plane | ± 10 mm | |
| 5. | Bump before installation (d) | ± 6 mm or L/1000 | |
| 6. | Evenness of the top surface (у) | 10 mm by 500 mm rail | |
| 7. | Holes, cut-outs | ||
| – In the fresh concrete | ± 50 mm | ||
| – In hardened concrete | ± 15 mm |
Marking of slabs
Hollow core slabs marking in accordance with GOST 23009:
For example: PC 60.12.2,2-4,2 K7 hollow core slab6000 mm long, 1200 mm wide, 220 mm high, calculated load 4.2 kPa.
Peculiarities of loading / unloading
Hollow core slabs raised with special grippers suspended from a steel girder-lifting traverse. In some cases, is permitted to use mounting straps (soft lines). Accessories factory lifter.
Installation
Installation of hollow core slabs should be in accordance with the SNIP 3.03.01-87 “Bearing wall construction.” Plant “Oberbeton” provides technical support and carries out technical supervision of all phases of the construction of the facility where Company products used.
