Prefabricated slabs - what is it?
Prefabricated interfloor overlappings are mounted on bolts or directly on the walls of the building, and due to its lightness the walls can be made of light-weight materials: gas and foam concrete, gas and foam blocks, bricks, expanded clay blocks, slag blocks, etc.
Thanks to the use of cellular concrete, the weight of one meter of reinforced concrete beam is not more than 17 kg, which allows, if necessary, to lay them without the use of construction equipment. Beams are laid on the supporting walls or on the crossbars located on them and already after installation are cut directly on the size of the object.
Hollow block-inserts in their lower part have grooves, which allows them to manually fill the space between the beams to set an even level of concrete filled with concrete. The prefabricated overlap with the liners plays the role of a fixed formwork into which the fastening concrete of class M250 is poured and then compacted with a screed or manually by the bayonet method.
It is appropriate to note that 1 m2 of finished prefabricated-monolithic flooring weighs only 230-350 kg, while its analogue of a monolith is 480-500 kg.
Prefabricated interfloor overlapping - why should I put it into service?
Prefabricated slabs significantly reduce labor costs and time for installation of underlaying and interfloor ceilings, as there is no need to install a removable formwork and supporting structures, and reinforced concrete beams and lightweight hollow liners are manually laid by a team of three or four people.
Very significant for the construction of the fact in favor of such overlappings is that there is no need for additional insulation and sound insulation, as well as in the creation of leveling screeds. And if we summarize the above, application of overlaps of this type allows:
- to reduce the weight of overlaps by 30% compared to hollow plates, and by 50% compared to monoliths;
- to conduct laying without the use of construction equipment;
- do without creating leveling screeds;
- to reduce the cost of overlapping by 30-40%;
- without the use of additional materials to improve the thermal and sound insulation characteristics of the floors;
- to reduce by one third the time costs for installation in comparison with monoliths;
- emptiness in blocks used for laying communications;
- to cover buildings of unconventional forms with ledges and bay windows;
- exclude removable formwork equipment;
- erect floors in hard-to-reach places.
How to lay prefabricated-monolithic ceilings?
As already mentioned above, assembly and assembly of prefabricated-monolithic flooring can be performed by three people. Even without special knowledge and skills, but faithfully following the recommendations of the instruction, they are able to build a fixed formwork, which then remains poured with concrete.
It should be especially noted that there must be good adhesion between the reinforced concrete beam and the concrete part of the floor - only in this case the overlap fully possesses the necessary characteristics.
The reinforced concrete beams on the walls or crossbars are laid in 60 cm increments. The weight of the beam meter is 17 kg and this makes it possible to carry out the laying work manually, without the use of construction equipment. Moreover, the weight of the hollow block, which is also manually stacked between the two beams, does not exceed 6 kg.
Above the block is laid the reinforcing mesh with a cell 100x100 mm with a diameter of reinforcing wire of 6 mm. It should be remembered that concrete requires quite a noticeable time for complete freezing and special temperature conditions.