The correct calculation of the pillars for the fence - a

The fence performs not only the protective function of the backyard plot or a certain territory, but is also the hallmark of the object. Simple at first glance, the construction requires in its construction a detailed and precise observance of certain rules.

A preliminary calculation of the fence will allow you to avoid future problems associated with skewing, tilting, falling and other troubles.

Fencing do it yourself

The construction of the fence

Any fence can be divided into several structural parts:

• supporting frame formed by racks that take the total load of the fence;
• cladding part, consisting of corrugated, picket fence, metal mesh and other material;
• cross-pieces (logs), giving the structure additional rigidity and strength;
• mounting material.

Obviously, the main role is played by the supporting part of the fence.

For the frame most often used pillars:

• metal;
• asbestos cement;
• brick;
• wooden.

Photo determine the depth of the bookmark post

Calculating the cost of fencing

Construction cost

When building a fence with your own hands, it is very important to know how to calculate the length of the fence in relation to the cost of the linear and square meters of the future fence.

Before deciding on the construction of a structure, it is necessary to make an accurate calculation of the cost of the fence.

Making calculations

To carry out the calculations fit the following instructions.

1. The calculation begins with measurements of the perimeter of the object, which must be protected;
2. After that, a decision is made on the type of bearing and enclosing part of the structure;
3. Then the amount of building materials required, their price is determined, the cost of the work is necessarily taken into account and added;
4. To install a beautiful, practical and strong fence, it is necessary to accurately and correctly calculate the amount of building materials, including the distance through which to install the pillars for the fence. From these calculations depends on the reliability of the design, and financial costs;
5. Calculate the price per running meter of the fence of the required height;
6. The total length of the structure is multiplied by the cost per linear meter, and the approximate financial expenses for the required structure are obtained.

Calculation of running meter fence

It is important to know how to calculate the meter intake meter:

1. To do this, the total length of the structure should be divided by the useful width of the selected sheet of corrugated board for the fence. As a result, we obtain the required number of sheets;
2. The resulting number of sheets is multiplied by the required height of the fence;
3. The result is multiplied by the total width of the corrugated board and we obtain the required area of ​​material for the fence;
4. Multiplying the area value by the cost of one sheet, we get the cost per meter;
5. Be sure to consider the cost of lags and supports.

Calculation of the fence - a necessary circumstance

Calculation of the depth of the supports

Any fence is subject to the force of the own weight of the structure, which is directed strictly along the axis of the column and the force of the wind pressure, which is applied across the structure. Therefore, a torque (bending) moment, which has a maximum at the point of its exit from the ground, acts on the support.

Bending moment - the main cause of the destruction of enclosing structures. It does not make sense to take into account the force of its own weight when calculating racks, since it is minimal and does not have a significant effect on the strength of the base.

Many owners are also concerned about the question of how deep to dig in a pole for the fence?

Important! To determine the depth of laying of supports in the ground, the calculation of the wind load on the fence is taken into account.

1. First, it is necessary to calculate the estimated area of ​​one link (section) of the future fence. If we assume that the width of the fencing section (L) is planned to be 2 meters, and the height (H) is 1.5 meters, then the area (S) of one section will be 3 sq.m. (S = 2.0 m * 1.5 m = 3 sq.m.). The same area will fall on each pillar (1.5 meters of each section of the structure to the right and left of the support);
2. To obtain the wind load on the structure, it is necessary to multiply the area of ​​the section by the aerodynamic coefficient and the value of the velocity head of the wind. The aerodynamic coefficient (constant) for a vertical structure is 1.4. The accepted value of the wind pressure is 40 kg per square meter;
3. In our case, we find that the pillar is experiencing a wind load of 168 kilograms (3 sq. M. * 1.4 * 40 kg / sq. M. = 168 kg).
4. Calculate the torque acting on the support. To do this, the wind load is multiplied by a constant factor (168 kg * 0.8 = 134 kg / m); After determining the torque, we divide it by the value of the coefficient of the moment of resistance - 225 (constant) (134 kg / m / 225 = 0.6 m);
5. Calculations show that the wind load is fully compensated, and the fence is completely independent of the wind, it is necessary to lay poles to a depth of at least 60 cm. For confidence, you can add 20 cm, since the ground itself is quite loose;

Billboard calculation scheme

Tip! To get a hundred percent confidence in the stability of the fence, regardless of the type of soil, groundwater level and the material of the enclosing part of the structure, it is necessary to dig the framework into the ground by half the height of the fence, plus another 10 centimeters).

1. If the soils, at the installation site of the structure, swell during freezing, the depth of installation of the support columns must also be increased to 1.5 m. In places where it is not possible to deepen the supports to the calculated depth, corners are welded to the supports to extend the area of ​​the support;
2. In case of use of supports from metal pipes for the intake, it is necessary to pour them inside with a liquid cement mortar. To protect metal pipes from corrosion, they are covered with red lead;

Disregard for calculations

Tip! To extend the service life of wooden poles, their underground part must be treated with a blowtorch, impregnated (coated) with kerosene-bitumen antiseptic, heated with bitumen or special impregnation, and wound with roofing paper.

1. The bottom of the pit is covered with sand. The support is covered with brick battle (gravel), it is covered with earth on top and carefully tamped. For greater stability, fence posts must be concreted.

More details on the installation features of the fence supports can be found on the video in this article.

Pillar installation

Calculate the number of supports

For example, it is planned to install a fence 1.6 meters high, with a total length of 40 meters. The role of the base will be performed by supporting posts, cemented in the pits, and the enclosing part will be made of painted professional sheets.

Profile pipes are one of the most common materials for the manufacture of supports and the frame, because it is convenient to use a rectangular cross-section during installation.

Knowing the parameters of corrugated board, we determine the number of sheets that will be needed for the fence.

If the total width of this sheet is 1.18 m. (Working width - 1.14 m.), Then the total length of the fence divided by the working width of the sheet and we get the value - 40 m / 1.14 m = 35.08 pcs. This means that for the construction of a structure with a length of 40 meters you need 35 professional sheets.

Tip! The resulting value should always be rounded up.

To calculate the number of pipes as a support, it is necessary to divide the total length of the upcoming fence by the length of one section (span), which is usually 2.0 - 2.5 meters, and add one (40 m / 2.5 = 16 + one). Thus, 17 support posts are needed to install a fence with a total length of 40 meters and a section width of 2.5 meters.

Distance between supports

The selected distance between the columns for the fence depends on their section. The higher the structure you want to build, and the greater the distance planned between the supporting pillars, the more durable and with a larger cross-section must be the pipes.

Installation of supports under the netting net

For example, for fencing with a height of 2 meters and a width of a section, also 2 meters, it is necessary to use a round pipe 76 x 4 mm, or a square 60 x 4 mm or more to support.

Conclusion

If you accurately and correctly calculate the fence, you can significantly save construction material, as well as financial resources.

When calculating the fence, all indicators are important, including the distance between the fence posts, on which the stability and strength of the whole structure depends.