Foundation in the ground without formwork - how to fill it and whether it is necessary to insulate. Building a house from scratch is at least costly, since most of the funds will go away even at the stage of pouring concrete. And this is quite logical, since it is the foundation that is the basis of the house. But sometimes money is not enough, and therefore you have to resort to various tricks. If you do everything as described in the article, you can save from 20,000 to 25,000 rubles.
What are we talking about? About creating a foundation in the ground without formwork. Working with such an add-on is simple and effective, but you can cope without it.
You should also be aware that creating a foundation without formwork is like painting an unprimed wall, it seems to save money, but there are some risks of using it in the future. What to do in this case and can the process be simplified so? Let's find out.
If we talk about our case, what is the role of formwork? Naturally, you need to spend a lot of money, effort and time on it, so it is integral to the design, and one cannot but agree with this.
It makes it possible to obtain the characteristics of the calculation for the base tape. Formwork is an overground part of the structure, which is made of boards, boards, sheets of metal and other materials. It also forms the basement of the building.
There are some indisputable advantages of the formwork:
Please note that the main task of the formwork is to withstand the concrete mortar and the ground part so that the foundation tape will not be changed until it is completely solidified and solid ...
Also, a tape of ideal configuration is formed above ground level.
But is it really impossible to do without formwork ? Not really. If you can meet all the requirements (proper installation of reinforcement, creating a flat trench and laying a layer of waterproofing), then you do not need it. But in this case, there will be no basement, but for small and lightweight buildings, pouring the foundation into the ground without formwork will be a good solution for saving. In this case, the formwork is not needed, you just need to dig a trench and pour concrete mortar into the ground, and the walls of the pit will be used as formwork.
Despite the fact that there are many risk factors, if you do everything right, it will be beneficial and beneficial.We note right away that such a foundation should not be considered to create a ground part, which is also called a basement. Sometimes it is even irrational if construction is carried out in a region with severe winter.
But there are some pluses:
It is possible and even necessary to refuse formwork if the construction will be carried out on loamy soil.
In order to exclude negative phenomena and cold pushing out, partial or complete freezing of the soil will help you.
On the territory of Russia, you can make a foundation in the ground without formwork with your own hands like this:
This is called reinforcement.
But keep in mind that there is one caveat: to fill the foundation with and without formwork, you should choose the right cement grade. For such work, it should be at least M300, but the best option would be M400. This is exactly what experienced professionals do so that the base does not collapse and lasts for many years.
If in your region the soil is considered mobile and weak, then creating a tape base will be difficult and time consuming. Needless to say, if in places without groundwater, the finished foundation can cause distortion of the profile in the trench when there is no formwork.
So, it turns out that the foundation poured into the ground by 90% in terms of strength depends on the preparatory work, which includes the manufacture of the trench, reinforcement and waterproofing work.
All this looks like this:
The main task is to make a perfectly flat trench, as well as to use a plumb line and level.
Cover the bottom with Izospan material.
As you can see, the preparation is not that difficult. But it is precisely when all these rules are followed that you will get an ideal foundation in all respects for pouring the foundation without using formwork. But there are still some subtleties that should be considered before starting work.
Working with the earth is considered labor-intensive, and for this reason, you are advised to do it with assistants, or use the services of an excavator.
The sequence for digging a trench is as follows:
In the photo you can see a detailed implementation plan.
The trench should be cleaned of the ground and everything else that will interfere.
Although the best option would be tamping using a motor vibrator, in the absence of one, the process can be done by hand.
When everything is ready and awaiting the next stage, another question arises - how to properly reinforce the foundation in the ground without formwork?
Before starting the reinforcement, you will need to buy the rebar and the wire with which you will tie the rods. The task is as follows - you need to form a reinforced frame on the surface of the earth, and it must necessarily consist of 3 layers of rods, which are tied together with wire.
The greatest load on the foundation will be on the bottom and surface of the foundation strip.
It is in such parts that the reinforcement frame will be placed. At the same time, do not forget that in no case should it be laid on the ground. It must be at a distance of 50 mm from the walls and bottom of the trench. This will allow the concrete mortar to completely absorb the frame.
As a result, you get the foundation for the foundation.
And the last stage - it remains to pour the foundation without formwork, while you have 2 options for events:
Everyone will decide for himself what is better and more profitable for him, but it is recommended to order the mixture from trusted companies, and although you will spend more money, you will have more time and energy.
Good advice! In order to calculate the required volume of concrete, you should calculate the entire length of the foundation strip, height and width, and then multiply these indicators by each other.
For example, if the length is 35 m, the width is 0.5 meters, and the height is 1 meter, then the volume of the tape will be 17.5 m 3 . If you are all in favor of saving, then doing everything yourself is more profitable. Cooking will be rational if you use a concrete mixer.
For concrete mortar you will need:
And on account of the proportions, the following - for 10 kg of cement you need 30 kg of sand and 45 kg of gravel / crushed stone. To get a mixture of the M400 brand, use exactly two times less water than dry components. For example, 10 kg of cement, 30 kg of sand and 45 kg of gravel = 85 kg, and then it turns out that the required amount of water is 42.5 liters.
When the mortar is ready, it can be poured into the finished trench.
The mixture should be distributed evenly, for this use a shovel and tamp everything well. It is also important to expel air bubbles and make the concrete as dense as possible. The work is carried out in several layers, with a thickness of 26 cm. When the tape is completely filled, the surface should be smoothed and leveled. To prevent debris from getting inside, cover everything with plastic wrap.
Hurray, the foundation is ready! Now it remains to wait about a week so that it has time to harden. Final drying and durability will be only after 31 days.If such work was carried out in the summer, the concrete will need to be moistened from time to time so that it does not crack. Before starting construction on a finished foundation in the ground without formwork, it should be covered with waterproofing material, and roofing material can be called the simplest.
If you want to save a little and make a foundation without formwork for a small building, this is quite possible, and in this article you will see all the advantages of the method.
The work should be carried out carefully, monitor the evenness and compact the trench well, and then your foundation will be no worse than usual!
( 2 estimates , average 5 of 5 )
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