Precast-monolithic floors: calculation, types, features. When building private houses, craftsmen often have the following question - what material and how exactly to make the floors? The most popular material was the use of reinforced concrete slabs (and much less often pouring is used). The reason is clear - the method is familiar to everyone. But the most rarely used option is precast monolithic floors, since many believe that the costs for them are the greatest, and the complexity of the installation is many times greater.
Let's try to figure out if everything is really the case and how possible it is to arrange them with your own hands for the person who performs such work for the first time in his life.
Precast-monolithic ceilings (SMP) are beams with trigons (special triangular frames made of reinforcement), which are at a certain distance from each other, and blocks are placed between them. It is they who, after the concrete is poured from above, become a single whole. As a material for the manufacture of blocks, as a rule, expanded clay concrete or foam concrete is used so that the final weight of the floor is not too large.
Useful information! Note that the more porous you use the material, the stronger the monolith will ultimately be. At the same time, the weight will be reduced to 35%, which will help to reduce the load on the foundation of the structure.
If we talk about the disadvantages designs, let's say right away that they are actually insignificant. They can even be attributed not to minuses, but rather to the small costs of the construction process. For example, if the beams are long enough, then during installation, support should be provided every 1.5 meters. When the work is finished, they should be removed.
Even at some moments it is inconvenient that the length of the reinforcement is more than 5 meters (in no case it is impossible to join separate segments).
But there are more than enough advantages. The main ones include:
If we sum up all the advantages, it becomes clear that with such a construction, the savings are significant.
In such a construction, difficulties may arise, but in the case when long overlaps are required - from 6 to 6, 5 meters and in this case it is better to secure yourself with a crane or manipulator.
In this case, the support beam of the precast-monolithic floor with trigons will all have more than 1 centner. If the length is not more than 3.5 meters, then the work will be much easier, and in this case it will be possible to do with the forces of not three, but two people. Such a beam will weigh no more than 65 kg.
Note, that beams made of concrete and with trigons have a weight of approximately 17 kg / l.
m. and at the moment these data are considered outdated. Manufacturers began to offer a replacement for a lightweight version of the material - galvanized steel. In this case, the weight of one running meter will be only 6 kg, and this will save builders from the cost of using heavy construction equipment.
Quite often, in houses where special impregnations are not used, wooden floors begin to rot, and this becomes a serious threat to those who lives in such a house.
Naturally, you can replace everything with new wood, but prefabricated monolithic floors will be much more durable and reliable, especially if you use blocks of polystyrene concrete. But in this case, it will be impossible to install concrete floors from reinforced concrete slabs, since it will not be possible to bring them inside with a crane, and manually it will not be possible. In addition, the weight of the slabs is quite large and the foundation of the house will not withstand such a heavy load.
But let's get back to how difficult it is to install precast floors. To do this, we bring to your attention step-by-step instructions for performing work.
Each beam should extend onto the wall no less than 13 cm.
At the joints, it should overlap, while also being attached to the trigons with a knitting wire.
So we can conclude that this type of work will be within the power of even novice craftsmen who have neither qualifications nor experience.
Naturally, the NSR cannot be called the cheapest option, but if you calculate the precast-monolithic floor, take into account the cost of materials, transportation , wages of workers, then you will understand that it is much more profitable than, for example, pouring with monolithic reinforced concrete. Let's try to compare the total costs when installing a floor between the second and first floor with an area of 10.5 * 8 meters and a thickness of 0.3 meters of gas silicate walls.
With these parameters, the price (in rubles, for March 2020):
25 meters ~ 200,000.
2 meters ~ 255,000.
Important! Precisely due to the fact that our compatriots are used to measuring the level of profitability only by the cost of the material and at the same time they do not pay attention to what costs will be for workers and equipment, it is believed that prefabricated monolithic floors are expensive. In fact, this option is the cheapest, and, moreover, it is quite simple to perform.
|Name + short description||Manufacturing company||Unit of measurement||Cost, rub.|
|Reinforced concrete floor beam 200-10 V25, maximum length up to 7 meters|| |
| p. |
|T-shaped gas block, 0.6 * 0.25 * 0.2 meters||pcs.||From 190|
|Steel beam, bearing capacity up to 500 kg / m2, length up to 9 meters|| p.
|Rectangular block Ytong 0.625 * 0.25 * 0.2 meters||m3||4700|
|Polystyrene concrete overlap kit (span up to 12 meters)||Ytong||m3||1600|
|Aerated concrete set 150 (up to 7 meters)||
|Aerated concrete set 200 (up to 8 meters)||1400|
|Aerated concrete set 250 (up to 9 meters)|| |
|Marco's kit Standard||1500|
| Reinforced concrete blocks from 1. |
8 to 8.6 meters
|From 750 to 5500|
|Concrete blocks T-600 V||From 100|
|Concrete blocks T- 450 K (expanded clay concrete)||190|
|T-600 L / 01 (polystyrene)|| |
|T-600 L / 02 (polystyrene)||780|
|T-600 L / 03 (polystyrene)||920|
|T-450 L (polystyrene)||745|
|Slabs to the laid form (assembly-monolithic slabs) P1|| |
Now you probably realized that although the SMP has some drawbacks, they themselves are quite convenient to install. In addition, the cost of the work ends up being much lower than when using reinforced concrete or slabs. The main thing is that you do not save on buying beams by creating them with your own hands (after all, some "masters" advise to do just that).
Such an attempt to reduce the total cost often results in big problems and even big costs, and the old saying comes to mind: "The miser pays twice." And even more - it's not just about money, but the fact that it will be a threat of collapse, which can cripple or even take life. The material itself can be with a total weight, but nevertheless, the additional load that will be provided should be calculated in advance.
Let's hope that the information in this article was interesting, and you learned everything that interested you.
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