Preparation of concrete for the foundation. Concrete preparation for the foundation. Laying the reinforcement cage

Before building the foundation, in addition to preliminary calculations, you need to prepare the construction site. The so-called concrete preparation for the foundation is needed first of all. It consists in erecting a pillow under the base.

There are a number of technical requirements governing the technology for conducting preparatory work, the choice of material and the thickness of the layer used for the pillow. The list of basic norms and requirements for pre-foundation preparation is set out in SNiP 52-01, SP 52-101 / 2003 and SP 50-101 / 2004. They contain a lot of information on the topic that interests us. Basically, the role of fundamental preparation is as follows.

Ideally, when drying, the wool is completely removed in plastic bag... To be able to fuss with quality wrenches, they are tied in the appropriate shape. Lobster, dill, willow, apple, cherry, juniper wreaths are also good for aging. Fragrances, compresses, sweets can be used for turbocharging, various other conifers, herb beds.

The time of the binding of the vans has not been determined either. Although it is said in many places that this is best for John, bathers do not clean the twigs before the leaves begin to thicken. It is important to find non-sharp branches, and they can be found in the shade, in the shade of large trees, where the leaves are only mature.

Basic functions of the foundation

If the foundation is planned to be poured in place, and not erected from ready-made blocks, preparation for the foundation will help:

  • Protect the concrete mix from slurry leaks. This will accelerate the collection of the required volume by the foundation and the overall improvement of its quality indicators.
  • To neutralize the force effects arising under soil pressure. Concrete preparation redistributes the forces that arise in the soil and weakens their negative impact on the foundation.
  • Provide a comfortable environment for the preparation of the base reinforcement cage, which can be mounted on a flat surface.

Types of preliminary work

According to SNiP 52-01, for concrete preparation under the foundation, crushed stone, lean concrete (it has a low content of binders, respectively, a low grade - from M50) or profile membranes are used as the main material.

The manor has certain rules: there is no alcohol, only in the bathhouse. This may surprise people who visit their baths. Do you think Lithuanian sauna culture is changing and how? The rules are designed in such a way that the sauna process cannot be disturbed by misunderstandings, unnecessary questions, so that you can think nothing at all and think nothing at all. It is customary in the estate that everyone in the same room goes to the steam room. You can leave the steam room forever, but please, leave your visitors indifferent once and for all, because steam often breaks to the door, disturbing the peace of the still warm people.

Crushed stone with bitumen

Crushed stone preparations are used to reduce the total cost of the foundation and reduce the consumption of cement. The thickness of the crushed stone layer should be from 20 cm. After thorough compaction, the crushed stone is poured with bitumen. Crushed stone preparation is used in cases where it is necessary to fill the foundation of the excavation with bitumen until the soil is saturated to the maximum or the formation of a bituminous film.

Concrete preparation device for strip foundation

The rules are very soon clear and accompanied by visitors. It is true that many guests are surprised when they are not asked to drink alcohol in the sauna. Later, many say thank you, because they understand how good it is to smoke not from alcohol, but from the sauna itself, how good it is to feel the light, to relax.

Laying the reinforcement cage

It is gratifying that not only in the manor, but also in other baths, the culture of a healthy Lithuanian bath is gradually expanding, this is undoubtedly the merit of Lithuanian bath enthusiasts. Many people have pyreths in their home. Unfortunately, the "fast" ovens offered by traders often do not create a healthy microclimate. Therefore, before building a sauna, you need to think about what we want: a quick-cooked semi-finished product or tasty dish gourmet baked in a wood-fired oven.

The use of crushed stone preparation of the foundation cannot provide sufficient rigidity of the substrate. In addition, it is not very convenient to erect a base on a crushed stone substrate. Therefore, it is used in the construction of auxiliary ancillary and technical buildings to minimize costs.

It goes without saying that the traditional Lithuanian bath is not bypassed by modern goods that perfectly complement the inventions of old age. Today, sailors use not only removal, but also salt, various clays, oil, crushed amber and other measures.

And pouring beer on stones does not bring any benefits, on the contrary - you need to smell the burning. In the course of the fire, not only the roof covered the walls, but many of them kept the ventilation holes in the attic - the most unfortunate ones. Our wrappers were just perfect - a small birch tree with a beautiful scent, perfect for aging.

Concrete preparation

It is needed to ensure correct process erecting concrete foundation and the elimination of soil subsidence. Skinny concrete is not a cheap option, however, it is used quite often. In such concrete, no more than 6% of cement, the rest is crushed stone and gravel. The thickness of the concrete preparation layer should be 50 - 100 mm. It depends on the weight of the future building, the level of groundwater and the type of soil.

Lean concrete application

The manor house is located in Rumsiskes, Lithuanian Museum folk life... How did different saunas and their traditions differ in different regions of Lithuania? The museum has a bathhouse or even several in each region. The manor belongs to the Aukštaity region. A beautiful three-room bathhouse is located next to the monastery on the mountain.

Some baths also had an additional function. There is a bathhouse in the church next to the church, and a smithy in Samogitia. It is unique that the steam room is located on the second floor, and the stones are located above the gate, so it may be that they do not need to be specially heated, this was during working hours.

Concrete preparation for the foundation is used, first of all, in the construction of strip reinforced structures. This is due to the peculiarities of the technological process, which provides for the rigid installation of frames and steel meshes into the body of the future foundation before pouring it with concrete. In addition, it is much easier to build a foundation on concrete, especially in winter.

A sauna designed for drying fuji can be found in other parts of the country: near the village of Dzukia, the bath is brought from the Kaisiadoris area. By the way, it already has a collection of wreaths; an exhibition will be held at the beginning of the museum season. different types wreaths.

Externally, the baths were in keeping with regional building traditions, but often the bathhouse remained the most archaic building of the farm. The bathhouse was built from what was at hand or at the expense. Thus, in rocky areas you can find a stone, sandy-semi-underground, poor peasant bath. Dzukia, and now there are many saunas on wooden piles.

Profile membranes

A modern way of preparing a foundation, which can replace crushed stone and concrete preparation. When laying them, "wet" types of work are excluded, money is saved, and the construction process is accelerated.

How to equip concrete preparation

The work must be done in the following sequence:

What is Lean Concrete?

It's harder to talk about the tradition of the sauna. Ethnologist Stasis Daunis, perhaps the only one who studies them, does not talk about regional differences in his articles. Maybe they are not very tangible or that there were no ethnographic materials available. But the traditions of the sauna, their traces are still alive in the memory of people, and we hope that in the future we will be able to accumulate so much knowledge that we can restore not only all the traditions of the sauna, but also feel the differences in each country.

This is one of the goals of our public institution "Bathing the Road". We look forward to community support: if there are people who know about the sauna tradition, please contact us. There was a fire in the manor a few months ago, but today the bath is working again. Do you know fire? What losses did you experience and how quickly did you open the sauna? What materials did you use to restore it?

  • First, for the foundation device, you need to make a marking of the construction site.


  • The site needs to be leveled and covered with crushed stone with a layer of 10 cm.
  • Use a vibrating plate to compact the pillow.


It is clear that the fire did not come from the sauna as it was burned a few days ago. Perhaps a human factor, maybe electrical wiring or what device - the exact cause has not been identified, but after it is installed, the result will not change.

Sequence of work on concreting

For a moment, we had no doubt that the manor bath, of course, would not disappear. On the day of the fire, we started organizing it, and three weeks later the first symbolic bath for the following friends took place. It took a lot of wood for the remodeling. We installed the ceiling from coniferous planks, we used round logs for the rafters, and the roof will be made from chopped daisies. Only for the insulation of ceilings, we used a material of modern times - an organic mantle made of wood fiber. During the restoration, we tried to ensure the highest possible safety in the entire building - the fire could come from the smallest details, such as a non-spotted candle.

  • Mark the perimeter and mount the formwork with a height of no more than 30 cm. Its height will depend on the thickness of the concrete layer.
  • It is necessary to pour concrete mixture under the upper edge of the formwork.
  • With the help of reinforcement, the pillow is reinforced using rods with a cross section of at least 8 cm.
  • The concrete must be tamped using a vibrating plate.
  • After pouring the site with concrete solution, reinforcement rods must be installed in it, the task of which is to fasten the foundation with a pillow. They should protrude above the concrete by about 20-30 cm.

On each side of the perimeter, you must retreat outside foundation slab by 10-15 cm, thereby increasing the size of the concrete preparation area. For a foundation made by the method of concrete pouring, there are no restrictions in use. It is considered so reliable that its reinforcement is not necessary. In practice, both options have proven themselves from the most positive side... Their only difference is that the unreinforced concrete pad has limited dimensions.

It would be difficult to assess the loss of money. We got support from a great sauna enthusiast and friends. People saved what they could: in a good word, in money, with everyday hands, hard work, who arranged food for helpers or in any housing. It's incredible, but thanks to friends, the heartbeat has become a positive, productive force.

The mansion rose a second time. True, if the house is being built on a slope or in a damp place, the foundation will cost more. Their design is always unique in its own way. A common mistake many clients make is choosing a typical project to save. This is not a bad choice, but such projects should calculate typical funds, and they should be calculated individually on a case-by-case basis. Before calculations, it is necessary to carry out engineering and geological surveys, which will investigate the properties of the soil at the planned construction site.

Construction requirements stipulate a minimum height of the concrete layer, which must rise above the soil surface by at least 15 cm. This allows for optimal placement of the mesh for reinforcement. The mesh is used to reinforce the bottom of the concrete pad, which is experiencing tensile forces. They are transmitted from the foundation, which is subject to the weight load of the entire structure.

The future site needs to carefully illuminate the contours of the future building, as minor and obvious imperfections will appear during construction. It will cost you, but it’s necessary, because just because the neighbor’s house is standing well doesn’t mean you’ll be standing next to you well.

To adapt a project to a specific site, you need to know the type of soil on this site, the depth of freezing and the amount of groundwater, their level, surface landscape, etc. foundries must be entrusted to professionals because small hidden underground defects do not appear immediately. This can be difficult or even impossible to fix later. When buying a built-in home, you should try to check the foundations and, with the help of a professional, verify that the zero cycle is working correctly.

To understand why concrete preparation for the foundation is needed, you need to carefully study the current regulatory documents. They say that any option for concrete preparation is better than none. It will provide the building with the best strength and stability, helping the foundation to keep the entire structure in good condition for a long time.

When building a new building, it is necessary to check how the foundation has been laid, since only in this case the owner can be confident in his property even after the expiration of the warranty period. There are two types of buildings - natural and man-made. Naturally preserved soil, which has a base and retaining properties. They provide stability and even seating. A primer that does not have good load-bearing properties and needs further approval or modification is called artificial.

A two-story house usually has natural soil properties. According to the design, the foundation is divided into strips, columns and bulkheads. V recent times the use of poles is becoming more common in low-rise buildings. They are very effective when soft ground is heavy or high groundwater is available.

Before building the foundation of a house with your own hands, it is important not only to carry out preliminary calculations, but also not to forget to prepare the foundation site properly. You have probably heard more than once about such a concept as preparation for the foundation. It is usually made either from crushed stone, which is carefully rammed, or from lean concrete. The thickness of the layer largely depends on the chosen building material, but its main task lies in the name - "preparation" - the base is literally prepared for the subsequent stages of foundation construction. In this article, we will look at the main types of preparation, and also pay great attention to the device of concrete preparation.

The base consists of natural hard stone, concrete and reinforced concrete of at least 50 grades, metal, red well-burnt bricks, pillars, impregnated wood. In order for a house to be stable and long standing, it is important to calculate the amount of foundation that needs to be built to protect against excessive sitting. Very often, the type and size of foundations is determined by the type of soil. The widespread misconception that the foundation must be massive and deep, it is difficult and expensive to overlay it.

How much soil freezes depends not only on the position geographic location but also from groundwater. When the temperature drops to minus, the moist soil dries up and the amount of water flowing on the ice increases by about 10%. and as a result of the expansion of the soil. In winter, the primer seems to be trying to pull the foundations out of the ground, and conversely, it is trying to add spring when the ice melts. Since this happens differently in different places of the foundation, foundation defects or even cracks may occur.

Everything you need to know about foundation preparation

Why is preparation necessary for the foundation of a house at all? In cases when it comes to pouring the foundation in place (not from ready-made prefabricated blocks), the role of preparation is reduced to:

  • protection of the concrete mass from the leakage of cement laitance, due to which the foundation reaches the required parameters faster, and its quality is better;
  • leveling the impact from the soil. Whatever one may say, but concrete preparation contributes to the distribution of forces arising in the soil;
  • providing convenience during the installation of fittings, to put it simply - on a flat surface it is much easier to construct a skeleton of the foundation

Types of preparation

In SP 50-101-2004 (we recommend that you familiarize yourself) it is indicated that lean concrete (which contains a small amount of binder, respectively, and its grade is low) or crushed stone can be used as a material for preparation for the foundation. Crushed stone is used to reduce the total consumption of cement on the foundation - simply as an economy. The thickness of this preparation is 200 mm: the material is compacted and spilled with bitumen. This path can hardly be called optimal and reliable, because crushed stone does not provide the convenience and rigidity that concrete preparation guarantees. That is why we will pay special attention to it.

An expanding primer can even lift an entire building, but in different areas of the graph of varying intensity. To prevent this process, it is necessary to properly lay the foundations. All primers are divided into two groups: expanding primers and non-expanding primers. Expansive primers include clay, sandy, hardened primers containing more than 15%. clay impurities. Small, sandy, wet soil is said to be floating and cannot be built. Coarse sandy soils, large to medium size sand without gravel, which does not contain clay impurities, are classified as non-expanding.

Features of the device of concrete preparation

In general, the choice between crushed stone and concrete preparation largely depends on the problem being solved. But in most cases, it is the last option that is the most acceptable. The concrete layer is relevant for reinforced tape or slab foundation when it is necessary to rigidly install steel meshes and frames before pouring the mixture. Secondly, with such preparation, in principle, it is easier to build a foundation, especially if construction works for some reason postponed for the winter period.

As a material, concrete of grade M50 and higher is used - it is decided on the basis of economic feasibility. The layer thickness is 100 mm - this is quite enough not only to level the site, but also to form a reliable base for the future foundation. The concrete preparation is laid on a sandy or crushed stone pillow in accordance with the accepted parameters of the basement of the house.

Concrete volume, m3:

Concrete grade (class):

M100 | B7.5 M150 | B10 M150 | B12.5 M200 | В15 М250 | B20 M300 | В22.5 М350 | В25 М350 | В26.5 М400 | B30 M450 | B35 M550 | В40 М600 | B45

Cement grade:

M300 M400 M500 M600

Placeholders:

High Quality Reduced Quality Privates

Coarse aggregate, mm:

10 mm | Crushed stone 20 mm | Crushed stone 40 mm | Crushed stone 70 mm | Crushed stone 10 mm | Gravel 20 mm | Gravel 40 mm | Gravel 70 mm | Gravel

Fine aggregate, mm:

Fine sand (1.1-1.8 mm) Medium sand (2-2.5 mm) Coarse sand (over 2.5 mm)

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