Asbestos pipe as a support for a canopy. How to properly make a columnar foundation from asbestos pipes with your own hands? Features of asbestos base

A foundation made of asbestos pipes is suitable for any unloaded structures, be it a private bathhouse or a garage, a terrace or a frame residential building. Such a columnar base is quite easy to build with your own hands.

A base made of asbestos pipes requires minimal effort and time. It is not suitable for heavy buildings and houses. But there is practically no alternative to it when constructing light buildings in areas that are flooded during floods. A columnar foundation made from inexpensive products has the required resistance to destruction caused by wetting of the structure.

Columnar foundation made of pipes

The main advantages of such bases are as follows:

Low cost of materials and economic feasibility of construction. A pile foundation made of asbestos-cement pipes is always cheaper (and significantly) than block and buried strip structures.
Easy to calculate base. Its design is easy to do with your own hands, without spending money on turning to professional designers.
Asbestos pipes are not subject to corrosion and can be processed mechanically without any problems. They also do not change their linear parameters when the ambient temperature fluctuates.
Short construction time without the use of special equipment and the preparation of a finished foundation made of pipes.

The disadvantages of the structures under consideration include their relative fragility (a base made of asbestos products has been in use for 60–70 years) and the impossibility of arranging a cellar in a house built on a similar foundation. But this is not a problem, because the basement can also be built as a separate structure.

Visually, the foundation made of asbestos products consists of pillars installed in several lines. These rows of pipes are a reliable basis for the construction of the planned building. The basic principle of constructing such a foundation is to pour concrete mixture only in certain areas, and not along the entire perimeter of the structure.

You need to decide on the number of supports that will make up the columnar foundation, as well as its depth. No knowledge of higher mathematics is required to perform such calculations. The depth of the pipe base depends on:

the magnitude of the load on it for future construction;
depth of soil freezing in a specific area.

The lighter the structure you build, the less stress it will put on it. In most cases, the depth of the base of asbestos-cement products is taken to be about 150 cm. In this case, pipes of different cross-sections are used. If a frame house is being built, it is recommended to use products 25–30 cm in diameter. But to build a light summer veranda or gazebo with your own hands, pipes with a cross-section of 10 cm are enough.

Creating a foundation from asbestos pipes

It is easy to find out about the depth of soil freezing in a particular region from reference tables (they are abundantly available on the Internet). Note! Such signs always indicate the amount of freezing of bare soil - without taking into account snow cover. In areas where a lot of snow falls, the depth values recommended by the reference book can be reduced by 5–10 cm.

Second point. You should add about 40 cm to the depth indicated in the reference table. The resulting value will tell you the exact length of the underground part of the asbestos-cement products. And the pipes should protrude about 30 cm above the ground. If the floods in your area are quite serious, you can “stick out” the piles higher above the ground.

Support pillars must be placed under the central part of the building, along its perimeter and at all angles. It is important to install enough piles so that the load from the building is distributed evenly across them. In this case, the load on one support should be a maximum of 800 kg.

To do the work yourself, you will need asbestos-cement pipes, a concrete mixer, a grab or a hand drill, construction sand, gravel, cement, reinforcement, and a shovel. It is with the help of this set of tools and materials that you will build a reliable columnar foundation.

House on a foundation made of asbestos pipes

Prepare the site for the construction of the foundation:

You clear the ground and remove the turf from the area where the foundation will be built, then cut off the fertile part of the soil.
Carefully level the site.
Take the rope and pegs. With their help, you mark the contours of the future structure, mark the intersections of the walls and the location of the corners of the building. Install stakes at the points where the asbestos-cement supports will be located.

Now you dig holes for the piles with a shovel. The diameter of such mini-pits is taken to be slightly larger than the cross-section of the pipes used. If you have a drill, it is easier and faster to make wells with it.

Important! The depth of the pits is taken to be approximately 0.2 m greater than the calculated length of the part of the supports located underground. This is done so that you can equip a sand cushion in each well.

Do-it-yourself columnar foundation - a guide to action

In the prepared pits we make special pillows from. The thickness of the finished sand layer should be 0.2 m. Pour the sand, tamp it, water it with ordinary water, and compact it again. Then place a piece of roofing material on the made layer and perform the following operations:

Install asbestos cement pipes into the pits. Level them and fix them. Temporary fastening of the supports can be done using small wooden beams.
If groundwater flows close to the surface in the area, asbestos pipes should be waterproofed with bitumen mastic. Fill the pipe products with it to the soil level and wait until the composition dries.
Drive reinforcing bars around the pipes. Their length is taken in relation to the length of pipe products by 20 percent more. Be sure to maintain a distance of about 70 mm between adjacent rods.
Prepare the concrete solution. Mix 2 parts sand with one part cement M 400, add water to this composition. Stir the resulting composition until it becomes a liquid dough. Add water as needed.
Pour gravel (2 parts) into the mixture and mix it vigorously.
Pour concrete to a height of 0.4–0.5 m around the pipe product and directly into its center.
Raise the pipe 0.2 m and wait for the concrete mixture to harden. The support is raised in order to give the foundation additional resistance to pushing out piles during soil heaving.

High-quality hardening of concrete occurs in 8–14 days. After this, you can safely mount supporting elements on a self-made columnar foundation to install the planned structure on them.

How to save on the cost of the foundation of a house, but at the same time not lose its strength characteristics? One of the reliable structures is a foundation made of asbestos pipes, which can be safely used in the construction of frame houses or any light buildings. You can find out how to correctly calculate, select materials and build such a foundation in this article.

How to choose pipes

An asbestos pipe for a columnar foundation is selected with an average diameter of 250 mm. The cavity of the product must be filled with concrete. In some cases, under heavy loads, the inner part of the pipe is additionally reinforced.

If you select pipes of small diameter (100 mm), then it becomes difficult to fill them with concrete. There is a possibility of voids appearing, which will significantly reduce the service life of the foundation. Such pipes are most often used for lighter structures (for example, gazebos). But you need to be prepared for difficulties in installing such pipes.

For heavy buildings, pipes with a diameter of 300 mm can be used. It is easier to work with such material, because filling with concrete will be easier.

Advantages of a columnar foundation

The choice of asbestos-cement pipes for a columnar foundation has the following advantages:

low cost;
ease of installation;
strength;
durability.

The acceptable cost is determined by the fact that materials for the work can be purchased at a lower price than, for example, for the construction of concrete blocks.

Easy installation allows you to install the pipes yourself. There is no need to hire specialized equipment. This is a big plus for those areas where it is difficult for cars to pass through. In addition, it is possible to erect a structure on a columnar foundation within a week, unlike a monolithic one, which must be left to harden for a month.

The special composition of asbestos pipes (disperse-reinforced) makes the material resistant to negative environmental influences.

This provides moisture resistance and strength to such a foundation. Pipes have a low coefficient of thermal expansion.

Despite these advantages of asbestos pipes, it is necessary to correctly calculate the material. If you do not follow the technology, then all the advantages are reduced to zero. After all, further construction of a house on a foundation that cannot withstand a certain load will be dangerous.

Basic principles of construction

Before installing a foundation made of asbestos pipes, you need to familiarize yourself with several principles:

Build only light structures on it.
Consider the type of soil.
Carry out calculations.
Adhere to foundation construction technology.

Work on the device should be divided into several stages:

Carrying out calculations.
Preparing the area.
Installation of the foundation.
Formation of grillage.

Work begins with design. Installation cannot begin without preliminary calculations.

Calculation of grounds

Calculation of the foundation begins with determining the soil type of the soil. To do this, the depth of freezing of the ground is determined.

The length of the piles must exceed the freezing depth of the soil.

The importance of soil freezing differs in different regions. These indicators are determined using reference data. But please note that these values are indicated without snow cover.

It is also necessary to take into account the load of the future structure. On average, the depth of the piles is about 150 cm. As for the diameter of the pipes, it differs depending on the load (for a frame house or a small veranda, these indicators will be different).

To correctly calculate the bases, you should use the instructions:

Determine the weight of the house.
Determine soil resistance.
Calculate the area of the foundation.

General calculation formula minimum total base area looks like that:

It follows from this that P is the weight of the building, kg,

R 0 is the soil resistance, which is determined by calculation, kg/cm 2.

For the safety margin, a coefficient of 1.3 is introduced into the formula.

Calculation example

Let's give an example: there is a frame house with wall dimensions of 6x7 m, a height of the first floor of 2.8 m, and a pediment of 2.6 m.

The specific gravity of the frame walls is γ c = 50 kg/m2.
The specific weight of a roof made of sheet steel is γ k = 30 kg/m2.
The specific weight of interfloor ceilings is γ p = 100 kg/m 2.

The load of interfloor ceilings during operation is γ np = 210 kg/m 2.

The soil on which the house will be built is loam (R 0 - 3.5 kg/cm2), which has a freezing depth of 1.2 m.

Calculation of the number of pipes

To calculate the required number and size of pipes for the foundation, several steps are performed:

The mass of the walls is determined.

The area of the walls of the house together with the gables will be equal to Sс = 89 m2. Based on this, there is a mass of walls:

P с = S с × γ с = 89 × 50 = 4450 kg.

Then it is calculated mass of floors between floors(on the ground floor and attic).

The floor area is found (Sp = 84 m2). Floor weight:

P p =S p ×γ p =84×100=8400 kg.

At Sp=84 m2:

P np =S p ×γ np =84×210=17640 kg.

Determined roof mass.

The roof area is: Sk = 50 m2. Roof weight:

P to =S to ×γ to =50×30=1500 kg.

Done calculation of preliminary foundation mass.

To do this, take an approximate number of pillars, for example 14. Based on the fact that every 2 meters of the foundation (along the perimeter) a pillar will be installed, then 14 pieces should be enough. Pole length L = 1.9 m.

The column volume is determined:

Vс=π×R 2 ×L=0.24m 3,

where R is the radius of the column (R = 0.2 m). Based on this, the mass of 1 column is: 0.24 × 2500 = 600 kg.

Total mass of pillars: 600 × 14 = 8400 kg.

Total weight of the house

To do this, all the obtained values are summed up (walls, floors, roofs, foundations) and the final number is 40390 kg.

The minimum total area of the bases is calculated using the formula given at the beginning of the section: S = 1.3 × 40390/3.5 = 11540 cm 2.
When calculating the base area of 1 column, the number 1250 cm 2 is calculated. (S = pr 2 = 3.14 × 0.2 2) The total number of columns is calculated: 11540/1250 = 10 pieces.

It follows from this that as the diameter of the pillars increases, their number can be reduced and vice versa.

Only after this calculation can you begin purchasing materials and installing the foundation.

Preparation for arrangement

Preparing the area for the construction of the foundation consists of preparing places for installing piles. To do this, the land plot is cleared of weeds and vegetation. Then the area is leveled and sprinkled with gravel. (You can read about the types of gravel, as well as its fractions and density).

After this, pegs are placed in the places where the pipes are installed, and a rope is stretched between them. It is necessary to accurately measure the location of the foundation.

Foundation made of asbestos pipes. Step-by-step instruction

After preparation, the main work on the device begins:

drilling of the wells;
pipe installation;
frame installation;
filling.
tying pillars.

Wells are drilled in places where pegs are installed.

The diameter of the holes should be 10 cm larger than the diameter of the pipes.

Drilling performed mechanically or using a hole drill. The depth of the pipes must be equal to the calculated value. After this, sand is poured into the well, filled with water and compacted.

Pipe installation is done as follows: a pipe is inserted into the prepared well, filled with concrete (⅓ part) and raised by 15 cm. (For how to prepare concrete yourself, read the article Concrete: how to prepare it yourself.) Due to this, a concrete base is formed, which will protect the foundation in winter period and protect it from bulging. You can find out how to correctly cut a pipe of the required size in this video. Step-by-step instructions for cutting a pipe are provided.

It is necessary to constantly check the installed pipes for level. They must be installed perfectly level.

Next stage - frame installation. To do this, fittings are inserted into the pipe. Its rods should protrude 10 cm above the pipe. After that is poured the remaining concrete into the pipe. The space between the outer walls of the pipe and the inner walls of the well is filled with gravel and compacted.

Once the pipes are completely filled with concrete, they should be left for about 14 days.

This time is enough for the mixture to set. Then you can proceed to the final stage of work - the formation of the strapping.

Beam fastening fittings

Pole tying(or the formation of a grillage) is necessary in order to evenly distribute the load on the posts. In addition, the grillage is a support for future walls. Therefore, this design must be performed efficiently, following the instructions:

Make formwork from boards on the pipes.
Pour sand into the bottom of the formwork.
Install the fittings on the sand, connecting them to the fittings that come out of the pipes.
Pour the concrete mixture.
After the concrete has hardened, remove the formwork.

Step-by-step instructions, from drilling wells to forming a grillage, are presented in this video

In order to get high-quality results, you can use several tips:

To fill pipes, use concrete grade M200 or M300.
After pouring the concrete, the pipes should be pierced with a metal rod. This will eliminate air gaps.
To further protect the pillars from moisture, you can lay roofing material in the well on a layer of sand.
The formwork must be without cracks.

A foundation from asbestos pipes can be made in a fairly short time. This will take a minimum amount of money and time. But it should be borne in mind that this option is suitable for light buildings.

Asbestos-cement pipes are quite a popular material among summer residents and private developers. Most often they are used as fence posts. They are also used for chimneys and drainage pipes. Less often - for the construction of columnar foundations, and also as supports for canopies.

Below we have collected some information about asbestos-cement pipes that may be useful for those who are considering using them.

1) Asbestos pipes, which are used to support fences, they are afraid of water getting in - it can freeze in them in winter, expand, and as a result the pipe will burst.

To prevent this from happening, there are several ways:

Fill the pipe inside completely with concrete (this is suitable when installing a support by pouring concrete);

Concrete is partially poured, and then the top of the pipe is closed to prevent water from entering. The same is done if the post is not filled with concrete at all - this is when the post is mounted not in concrete, but in a hole that is filled with fine gravel around the pipe and compacted. You can close the hole at the top with a special plug, which is offered by manufacturers of asbestos pipes; in a cheaper option, you can put a plastic bottle on the pipe or wrap it in a plastic bag.

For complete security, so that water does not get into the pipe and from below, strong polyethylene can also be attached to the lower part of the pipe.

2) To secure on the asbestos pipe there are logs (crossed, veins) of the fence, you can use clamps and wire. And also with ordinary wood screws. This option may be stronger than the previous ones.

For fastening with screws, a wooden plug (a piece of wooden post that freely passes inside the asbestos pipe) is lowered into the pipe. Next, through pre-made holes in the pipe, screws are screwed into these wooden plugs.

3) When installing a fence In order not to completely fill the asbestos-cement pipe with concrete, you can fill it only to ground level, then fill it with sand. And on top again with concrete, but in a much thinner layer.

4) There are direct asbestos-cement pipes and pipes with sockets. The latter are more convenient to use as fence supports. They will be more stable compared to straight ones.

5) The most popular for a summer resident or private developer, the size of asbestos pipes is 3950 mm long and 100 mm in diameter. This is the inner diameter. The wall thickness of such a pipe is 9 mm, i.e. the diameter along the outer wall of the pipe is 118 mm. Another common diameter is the asbestos-cement pipe 150 - however, the dimensions of its internal and external diameters are not one hundred and fifty, but 141 and 161 mm, respectively, and the wall thickness is 10 millimeters.

The length of the pipes is either 395 cm or 500 cm. When installing a fence with supports made of asbestos pipes, it may be more profitable to buy pipes 5 meters long. And then cut them in half. You can cut asbestos pipes with a grinder with a diamond blade (the same as when cutting concrete).

6) Asbestos-cement pipes are used for chimneys. However, you need to keep in mind that at high temperatures (above three hundred degrees) asbestos cement behaves in the same way as slate. Have you heard slate exploding in fire? An asbestos-cement pipe used as a chimney can burst in much the same way. In other words, it is unsafe to use asbestos cement pipes for chimneys.

7) Asbestos-cement pipes come in two types- ordinary, non-pressure (designated - BNT) and - pressure (designated VT). Pressure ones are stronger and have a thicker wall. As a result, they are heavier and approximately one and a half times more expensive than non-pressure ones. By the way, it is better to use pressure pipes when constructing a columnar foundation. But even in this case, the pipe can support the foundation not by itself, but when it is filled with concrete and the presence of iron reinforcement.

8) Asbestos-cement pipes are cheaper than iron pipes. So, a linear meter of iron pipe, which is also used to support fences, will cost 140-160 rubles, i.e. a pipe 3 meters long, for a two-meter fence, will cost 420 - 580 rubles. A four-meter asbestos-cement pipe will cost about 340-380 rubles. One meter will still remain. However, it must be taken into account that installing asbestos cement pipes is more expensive and more difficult.

Any capital construction begins with the construction of a foundation on which walls and the structure as a whole are installed. One of the most popular foundation options today is a pile foundation. Support made of metal pipes is a fairly convenient type for the construction of one-story buildings, utility buildings, garages and small houses.

Arrangement of a pile foundation is a fairly simple process that takes place even faster than the construction of a monolithic or strip foundation. In addition, a foundation made of piles is universal, since it can be used on various types of soil, including floating and heaving soils. Depending on which piles are selected, such a foundation can withstand different loads.

Support characteristics

The main feature of a foundation made of asbestos pipes is the process of its construction. Externally, such a base consists of pillars installed in the corners, as well as in the locations of load-bearing walls at a distance of one to three meters from each other. The main advantage of a foundation made of asbestos pipes is the speed of its construction, as well as fairly low financial costs.

Moreover, in order to equip a foundation of supports, a very small amount of concrete solution is required. If for a strip or monolithic foundation you need to first dig a pit or trench, then for a pile foundation this is not required, you just need to make a few wells. Accordingly, the site owner’s time and money are also saved.

If you follow all the necessary rules and construction technologies, pipe piles, like the foundation as a whole, will last quite a long time and will maintain the strength of the entire structure for many years. It is important to take into account when arranging a pile foundation that it will not be possible to create a basement in this way. Most often, pile foundations are used in areas with uneven soil, for example, on slopes, or in areas with weak soil, where a monolith or strip foundation will collapse.

Supports for pile foundations are made from a variety of materials, for example, asbestos cement, concrete, metal, wood or brick. The most durable foundations are those made of concrete and asbestos-cement pipes and pillars. Such supports have a number of advantages:

Very high level of strength.
High speed of construction work.
Resistance of the material to spreading.

Another important advantage of using supports for arranging the foundation is that there is no need to use heavy and large construction equipment. As a rule, in reality it is enough to use a regular drill, a concrete mixer, as well as standard available tools. The advantages of a support base are:

Simplified procedure for conducting communication systems.
Compared to the construction of a monolithic or strip foundation, the labor intensity of construction work is lower, as well as the lower cost of materials and lower expenditure of physical strength.
Protection of the building from flooding during periods of river overflow and heavy rainfall. The fact is that the main part of the structure when using a pile foundation is located above the ground by about 30 centimeters, and sometimes more.
There is no need to carry out any excavation work, since there is no need to dig a pit or trench.
High speed of completion of all work, no need to spend additional time waiting for the concrete to dry.

Despite the considerable number of advantages of a foundation with piles, such a foundation also has a number of disadvantages that must be taken into account:

A pile foundation cannot be used in areas where there are too large differences in height, as well as moving layers of soil that lie deep enough.
The use of supports for piles allows structures with a small mass to be installed on such a foundation. This is especially true for bases made of PVC pipes. For this reason, foundations on pipes are used mainly only for the construction of one-story buildings.
Inability to organize a basement or ground floor.
The duration of use of a foundation made of pipe structures, as a rule, does not exceed 85 years, which is significantly less than the service life of other types of foundations.

Types of columnar base

A pile for a columnar foundation can be made from various types of products. The following are actively used in construction:

asbestos-cement;
wooden;
concrete;
metal;
plastic.

The foundation, made on piles of asbestos-cement pipes, is considered the most durable. In addition, such a base has a number of other advantages:

Asbestos products have a low cost, which reduces the final cost of all work.
To equip a foundation of this type, it is not necessary to additionally construct formwork for pouring concrete mortar.
No special equipment is needed to install asbestos products.
Before installing the supports, it is not necessary to create a special cushion of sand and gravel.

In addition to asbestos products, other types of supports and technologies are used when constructing the foundation. For example, it is quite common to make supports and piles from steel pipes. In addition, for the construction of small lightweight buildings, the use of piles made of plastic pipes is common.

Construction stages: detailed instructions

Preparatory work

Before making a foundation, it is necessary to study the site where construction work will be carried out. The first step is to determine the following factors:

Estimated total mass of the entire structure.
Soil freezing depth.
Features of the soil in the selected area, as well as the characteristics of the soil layers.
Depth of aquifers.

We make markings

Then, taking into account all the features of the territory, it is necessary to mark the site and indicate the places where future piles will be located. To ensure that the pipes steel well and maintain a stable position, sufficiently deep wells are made. You can make them yourself using a gasoline-powered drill or using hand tools.

Drilling of the wells

Pipes must be installed in the corners of the future building, as well as in places where the walls of the building will intersect. As a rule, asbestos-cement pipes are installed around the perimeter of the structure at a distance of 1.5-2 meters from each other. The holes must be drilled so that their depth is approximately half a meter lower than the freezing depth of the soil. On average, the depth of the well is about two meters. The diameter of the hole is selected depending on the width of the pipes. The installed supports should rise 50 centimeters above the ground level.

Reinforcement

After preparing the wells and installing asbestos-cement pipes in them, additional steps must be taken to secure the support in the soil. You can do this in two ways:

Fill the inner surface of the pipe and some parts around it with concrete mortar.
Secure the supports with metal rods.

In the first case, before pouring, fittings are placed in the pipe, which is selected to be approximately half a meter longer than the pipe itself. The reinforcement should be placed 25 centimeters into the soil, and protrude at this distance above the pipe. Then all the pipes inside are filled with concrete. After the concrete has dried, further work can begin.

In the second option, the pipe is initially filled to only a third part. Then it is immediately raised a short distance from the bottom of the well so that part of the concrete solution pours out, forming some expansion at the bottom. After this, the entire pipe is filled with the solution to the very top. In this case, the reinforcement does not protrude at the top; instead, a special metal pin is installed, which protrudes above the surface of the support by about 30 centimeters. It is to this pin that the rest of the structure, in particular the grillage, will be attached.

When constructing such a foundation, special attention should be paid to reinforcement. It must first be treated with a special solution that protects against corrosion. This will allow you to maintain the strength, stability and stability of the building’s foundation for a long time.

When constructing the foundation of a pipe structure, it is very important to strictly follow the construction technology. Otherwise, the base will be skewed, resulting in deformation of the entire building.

Injecting concrete into a well

If there are loose layers of soil in the area, then before installing the pipes it is imperative to prepare a gravel cushion at the bottom of the well so that the support is more stable. When installing asbestos pipes on floating soils, the piles can be further strengthened with trenches filled with concrete mortar.
In addition, an additional option for strengthening casing pipes for piles is to drill holes closer to the top of the pipe and install anchors in them. Metal rods are then attached to these anchors.

A foundation on piles made of asbestos-cement pipes is convenient because it can be installed fairly quickly. In addition, the pile foundation allows you to quickly and easily install pipelines, as well as other types of communications. This does not require large financial or time expenditures; you can save on equipment and labor.

In private construction, foundations are often built from asbestos-cement pipes. The construction of the foundation of a house of this type does not require the use of expensive construction machines and mechanisms. Therefore, you can build a foundation from asbestos pipes with your own hands without much difficulty, significantly saving money on the construction of the facility.

Construction of a foundation made of asbestos pipes

The construction industry produces asbestos pipes of various diameters and lengths. The diameter of the pipes ranges from 120 mm to 250 mm or more. The length of the pipe can be 6 or 12 meters.

Asbestos products are widely used. They are mainly used in the construction of pipelines for various purposes. Resistance to moisture, durability of the material in low-temperature environments - all this attracts builders to use asbestos supports in the construction of pile foundations of buildings.

In fact, an asbestos-cement pipe filled with concrete can be considered both a pile shell and a columnar support.

Calculation of a foundation made of asbestos pipes

Pipes must be placed at a distance of at least 1 m from each other

The length of the support is calculated based on the level of soil freezing. Data on this is taken from SNiP in accordance with the location of the construction site.

Add 0.3-0.4 meters to the soil freezing depth, plus the height of the pipe above the ground - this will be the design length of the supports in order to build a foundation from asbestos-cement pipes with your own hands.

Using reference material and SNiPs, you can determine the total weight of all structures and equipment of the future home. The number of supports is determined according to their placement along the entire perimeter of the building, in its corners and at the intersection of load-bearing structures. The piles are installed at a distance of no more than one meter from each other.

For small buildings, a columnar foundation is laid from asbestos pipes with a diameter of 120 mm. You can use supports of a smaller diameter, but then you will need to increase their number.

The amount of concrete required for pouring pipes is determined based on the following consumption rates for one column 10 meters long:

Diameter 10 cm – 0.1 m3;
Diameter 20 cm – 0.5 m3;
Diameter 30 cm – 1 m3.

Installation of asbestos supports

When sawing asbestos pipes, a reserve length is added to the calculated size for losses when leveling the ground height of the supports.

The pipe is fixed into a well, the bottom of which is previously filled with concrete mortar.

Marking points for installing poles is done using twine and wooden pegs. The centers of the supports are placed in increments of no more than 1 meter. As a rule, a building under construction has a rectangular plan. Therefore, the correctness of the marking is confirmed by the equality of the lengths of the diagonals between the opposite corners of the pile field.

According to the established markings, holes of the designed depth are drilled into the ground using a drill. The diameter of the drill must exceed the transverse dimension of the pipe by at least 50 mm.

The bottom of the well is filled with concrete mortar with a height of 200-300 mm. To achieve a widening of the base of the pillar, the concrete is vigorously compacted. A dense layer of fill squeezes the soil to the sides, thereby forming a wide base. Foundation pillars made of asbestos-cement pipes are placed in the drilled wells. Asbestos supports in pits are fixed at the top with wooden spacers made of timber.

When installing asbestos-cement pipes, you must carefully monitor the strict vertical position of the supports.

Reinforcement of columnar supports

After installing the pile on the concrete pad, the internal cavity of the pipe is reinforced. 2-3 pieces of periodic profile reinforcement with a diameter of 12 mm are inserted inside each support. The vertical rods are tied together with smooth wire, creating a box-like structure.

The length of the vertical reinforcing bars should be such that their lower ends fit tightly into the base pad of the pit, and the upper parts protrude from the pile.

The protruding length of the reinforcing bars must be sufficient to connect the pile foundation to the grillage. Thus, the foundation of asbestos-cement pipes forms a rigid supporting structure with sufficient load-bearing capacity.

Concreting of asbestos cement pipes

Concrete for pouring piles is prepared from a mixture of cement, sand, and fine gravel in the following proportion: 1:2:2. The dry mixture is diluted with water until a homogeneous dough-like solution is obtained.

If a columnar foundation is erected without widening the lower part of the base, then when pouring the first layer of mortar, the pipe is raised upward by 100-150 mm. The pile is left in this position until the concrete mixture hardens. Then proceed to reinforcement and complete concreting of the internal cavity of the support.

Each layer of concrete is thoroughly compacted. Due to the narrow cross-section of the asbestos support, pieces of smooth reinforcement or similar rods are used to compact the layers of fill.

The poured layer of mortar is compacted by the vertical forces of the reinforcement bar. Tamping the solution is considered complete when cement laitance appears on its surface.

Watch a video of how to fill an asbestos foundation pipe.

I fill the gaps around the supports with sand. The sand is poured layer by layer with water and compacted. A columnar foundation made of asbestos pipes, after pouring it with a concrete mixture, is left alone for three to four weeks. During this period, the foundation will acquire sufficient load-bearing capacity to continue further construction.

Economic feasibility of a foundation made of asbestos pipes

Practice shows that constructing a house foundation from asbestos-cement piles can reduce the cost of building the foundation by 30% to 40%. With all the economic advantages, you need to remember that a columnar foundation made of asbestos-cement pipes is not designed for heavy loads from heavy structures.