Encyclopedia of Fire Safety

Round timber measurement table. Seminar “Efficient pellet production.” Methodology for calculating the mass and volume of logging residues

Debarked round timber (logs) is a very popular material. Unlike rounded logs, debarked logs have a significant advantage, because they retain the top splint layer, which effectively protects the inner wood from various pests and bacteria. Thanks to this, a log house made of debarked logs will last much longer and will require less cost for antiseptics than a house made of rounded logs. When purchasing logs for building a house, it is necessary to determine not only their quantity, but also their volume, because all suppliers sell logs by volume. You can convert quantity into volume either manually, remembering school lessons in algebra and geometry, or using tables or special tools. In this article we will talk about various calculation methods that will help you correctly determine the required volume when ordering and purchasing logs.

Calculating log volume manually

The methodology for determining the volume of a log is described in detail in two documents adopted back in the Soviet Union - GOST 2292-88 And GOST 2708-75. Since then, no changes have occurred in this technology, so all the recommendations set out in GOSTs are still relevant today. Here are the basics for both measuring an individual log and determining the volume of stacked logs:

  • the diameter is determined by the upper (thin) edge of the log using mechanical measuring forks (analogous to a caliper);
  • the diameter of the upper part of the log is measured twice, with a deviation of 90 degrees; if the values ​​​​differ, then they are averaged;
  • when determining the diameter of the log, the thickness of the bark is not taken into account;
  • diameter is rounded to half a centimeter;
  • the volume of logs for building houses is determined by multiplying the average volume of a log by the number of logs in the stack;
  • Measuring the volume of logs by multiplying the height, width and length of the stack is unacceptable.

After determining the diameter and length of the log, its volume is calculated using the formula. For example, the volume of a log 10 meters long and 15 centimeters in diameter is 0.176 m³. Therefore, there will be 5.5 logs in one cubic meter.

Video - Calculator - cubaturnik

Determining the volume of a log using a computer caliper

Computer measuring stick Determines the volume of each log by measuring the diameter and entering the length. Using this tool allows you to avoid tedious work with tables and numerous calculations. After determining the thickness and entering the length of the log, the fork independently determines its volume and displays the data on the display. Because of high cost This tool is used only at wood processing enterprises.

Selecting a volume measurement method

Selecting methods for recording and measuring wood volume
regulated by the following regulatory documents
(GOST):

  • for firewood and non-grade (fuel) wood
    GOST 3243-88
    Firewood. Specifications
    Download (downloads: 6871)
  • for round timber
    GOST 2292-88
    ROUND TIMBER

    measurement methods and acceptance
    Download
  • You can read more generally and in detail in the reference book:
    UNION-ALL STANDARDS FOR FOREST TAXATION

GOST requirements read:

  1. Round timber over 2m in length and fuel wood (firewood) over 3m in length are subject to piecemeal measurement and accounting in full, according to the roundwood volume tables (). In special cases (specified in GOST 2292-88, clause 1.2), round timber up to 2 m long is also subject to piecemeal measurement and accounting in a dense measure, in . Special cases are wood valuable species, raw materials for plywood production, aviation materials, etc.
  2. The volume of all other wood that is not included in the above categories is measured by converting the folded measure into a dense one.
    (from warehouse meters -> to cubic meters)
    (download for free)

Thus, from the requirements of GOST, the following follows:

  1. A dense measure, () is the main way to take into account the volume of any wood material, including firewood. Measuring the volume of wood in a dense measure is a very cumbersome and time-consuming way of making measurements and calculations, since this involves measuring the end diameter and length of each log piece by piece.

    Cubic meter (solid measure)

    Dense measure- the main method of measuring and recording the volume of wood.
    Dense measure- This net volume wood pulp, which is defined as the volume of the cylinder of each log, taking into account the average depth of the trunk.

    Wherein:

    • Each log is measured individually and
    • when measuring the diameter of the end -
      select the top cut (smaller end)
    • when measuring the diameter of the end -
      the thickness of the bark and sapwood layer is not taken into account
    • when measuring the diameter of the end -
      the diameter of the oval end is assumed to be equal to
      arithmetic mean
      between its largest and smallest value
    • the value correction is always made minus the gradation according to GOST
      (for example, an end diameter of 18.8 cm is taken to be 18 cm, not 19 cm, a log length of 4.47 m/p is taken to be 4 linear meters, not four and a half, etc.)
    • The measurement methodology for round timber is regulated by
      GOST 2292-88
      ROUND TIMBER
      Labeling, sorting, transportation,
      measurement methods and acceptance
      Download (downloads: 5442)
    • After the measurements have been made,
      the volume of each log is determined
      according to roundwood volume tables (by )

    The unit of measurement for a dense measure is cubic meter (cubic meter)

    To speed up and simplify the determination of the amount of round timber, a special method of counting it is used - timber pointing. The forest method is not regulated in any way normative document and, in essence, is a variant of shorthand writing

    Pointing the forest

    “Dotting” (dotting) of the forest is a shorthand writing method for recording the number and parameters of logs and logs, used to take into account when inventorying tree trunks stacked or “standing”. At the same time, a table is compiled in any form in which the measured (taken into account) parameters of round timber are recorded. Most often, these are the diameters and lengths of the logs, less often - the type of wood, sometimes - combinations of other required values ​​(age, species, etc.).

    The term “forest pointing” was born in those distant times when there were no computers and calculators. In ancient times, foresters used this prototype of shorthand calculation. This, however, does not detract from the advantages of this method of accounting today. Its essence is that each number corresponds to its own picture, a kind of hieroglyph that denotes this number.

    The term “dotting” itself comes from the words “dots”, which are placed in the accounting process

    The first point is a conventional sign that is applied to the end of a recorded and measured log in order to avoid its re-counting. The concept of a “point” on the end of a log is purely a convention. It could be anyone visible sign, the meaning of which is chosen depending on the circumstances. For example, this could be a special forester’s mark, the diameter of a log, or simply a slash drawn with chalk.
    . The second point is entered into the table in a special way and participates in further calculations of the amount of forest
    It happens like this:
    - the first four logs are four points at the corners of an imaginary square,
    - the next four logs are the lines connecting these points to each other into a square
    - and finally, logs 8 and 9 are the diagonals of the square
    Total - 10 logs symbolizes a square with crossed out diagonals
    - Then everything is repeated until the end of the calculation.

    Roundwood volume

    The volume of round timber is determined after pointing the round timber, when it becomes known how many and what diameter of logs are contained in the stack. To determine the volume of round timber, open the cubeturner and simple multiplication We find out the volume of accounted timber.
    Cubaturnik- a special table for calculating the volume of round timber. Along the vertical axis of the cubature are the diameters, and along the horizontal axis are the lengths of the logs. At the intersection of the vertical and horizontal - the volume for each log of the specified length and diameter.

    Round timber volume tables (cubic)

    Cubaturnik is colloquially called GOST 2708-75
    TIMBER ROUND Tables volumes

    : "(link-category)"

      (related-news)

16.06.2014 17:04

After all the ideas for implementing the construction of a house have been worked out and the final option for building a house from rounded logs has been selected, the question arises how much such a house will cost you. To determine cost of building a log house from rounded logs, you need to know how many cubes of logs are in this log house. In this article we will try to explain in detail how to calculate the cubic capacity for the construction of rounded logs.

Calculation of cubic capacity of rounded logs

The simplest way to calculate is using the formula - πr². H

Π — 3,14

r² — radius of a rounded log squared

N - length of rounded log

Substitute the data into the formula:

3.14 *(0.11 m)²* 6m= 0.228 m3

So, we got how many cubes are in one rounded log with a diameter of 220 mm. Next, you need to calculate the number of logs in your house and multiply the resulting amount by the cubic capacity of one log (0.228 m3). You can easily count the number of logs in a wall, but initially you need to determine for yourself how high the floor will be.

How to calculate forest cubic capacity

It is also necessary to add 7% to the resulting height by shrinkage , if the log has natural moisture.

For example, the height of the first floor is 2.9 meters. The height of one log is 220 mm minus the lunar groove will be 190.5 mm. Next, we divide the floor height of 2.9 m by the thickness of the log without a groove - 0.19 m, having previously converted all the numbers into meters.

2.9: 0.19 = 15.26 pieces. We received the required number of logs with a diameter of 220 mm in order to build a floor with a height of 2.9 meters. You must not forget to add 7% for shrinkage of the house. In total you will get 16 crowns. Now, to find out the full volume of the floor of a 6x6 house, 16 crowns high, you need to perform the following calculation:

16 (crowns) * 4 (walls) * 0.228 (volume of one log) = 14.6 m3 of logs. Now, to find out the cost of a rounded log for the entire log house, you need to multiply the number of cubes obtained by the price of the log for one cube. The cost of one meter of cubic rounded log can be found Here.

To perform calculations for other log diameters, we offer you a number of pre-calculated tables, using which you will certainly find answers to your questions.

Article prepared by the company ASK Egida, which performs construction of log houses and provides wide range of construction services in the suburban housing construction market.

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  • How to calculate the cubic capacity of a single tree without additional measurements?
  • Technology for calculating the volume of a single log
  • Calculation of cubic capacity of stored timber
  • How to calculate cubic capacity without using tables?

When industrially harvesting roundwood, it is quite difficult to determine its cubic capacity. To accurately calculate the volume of each log, you can use the formula for the volume of a truncated cone, which takes into account the main diameters of both cuts and the length of the log itself.

Round timber is very convenient and practical for building houses, bathhouses and other residential and non-residential premises.

In fact, like this in a complicated way The cubic size of round timber is not calculated. It is accepted all over the world to be considered more in a fast way. Special tables are used for this.

How to calculate the cubic capacity of a single tree without additional measurements?

Cubic meter of timber and folding cubic meter of round timber.

Just a few years ago, to calculate the volume of a single tree, they used the product of the arithmetic average of the area of ​​the cuts and the length of the tree. Using a meter (reminiscent of an ordinary caliper), the diameter of the tree in its middle part was determined. Then it was multiplied by 3 to obtain the cross-sectional area.

Next, the resulting number was multiplied by the length of the workpiece, and a volumetric result was obtained. This method of calculation is inaccurate, since the thickness of the bark is not taken into account. The number Pi was taken with a large deviation from the real one, and the formula in its distorted form gave large errors.

The formula itself looks like this: the diameter of a rounded log is divided by 2 and squared, then multiplied by Pi and the length of the log.

Even if you measure the thickness of the bark and take this into account to determine the diameter of the tree, deviations from real indicators will be inaccurate, although with a smaller error. More accurate calculations showed that actual deviations in cubic capacity calculations round log with primitive measurements they have a certain dependence on the parameters of the tree, which was taken into account when compiling the corresponding tables to determine the volumetric parameter. Let's try to figure out how to calculate the cubic capacity of the forest. For this you will need:

  • roulette;
  • corresponding calculation tables, where there is a finite cubic capacity.

Technology for calculating the volume of a single log

First, you need to use a tape measure to measure the length of the tree and its diameter at the top of the cut (excluding the bark). After this, let’s look at the tabular parameters: at the intersection of the line indicating the length of the tree and the column indicating the corresponding diameter, we find the volume of the measured body. Everything is simple and reliable.

Such calculations also cannot be called absolutely accurate, since the features in which the forest was grown and the shape of the trunk are not taken into account. But with large volumes of workpieces, it is customary not to pay attention to such trifles.

Calculation of cubic capacity of stored timber

For industrial volumes of round logs, other techniques and tabular data are used. In essence, a round forest in a stored state has the shape of a rectangular parallelepiped. Calculations of its volume are familiar to everyone from school. But this method cannot be used, since the size of the voids between the logs will not be taken into account. By the way, they also directly depend on the diameter of the logs, which can be calculated mathematically.

Through numerous calculations, a coefficient was determined, with the help of which a special table was compiled. It works similarly to the previously described table, with the only difference being that the volume of the mentioned parallelepiped and the average thickness of the upper cut are taken into account. The cubic capacity of the forest can be calculated with great accuracy.

Types of lumber and their volume.

But one cannot hope for good accuracy of calculations when stacking forest products inaccurately. This procedure is not used when storing timber in a warehouse, since in this case the volume that round timber occupies directly in the warehouse is estimated.

It is very easy to calculate the cubic capacity after preliminary weighing of the forest.

Round timber cubator table GOST

How to calculate cubic capacity without using tables?

There may be a misconception that in the forest industry it is impossible to correctly and accurately calculate the cubic capacity of round timber. But this is incorrect, since only primary methods for calculating the volume of round timber were considered here. In reality (especially when the forestry industry is in the capable hands of specialists) the process is much more complex.

Later, coefficients and special formulas are applied. This work is difficult, but this is the only way to calculate the cubic capacity of round timber with fairly high accuracy.

Construction work requires solving many different issues, including the most important task is the selection and purchase of lumber. Calculate how much linear meters boards and timber will be needed during the construction process, it’s not difficult. That's just the price industrial wood indicated for 1 cubic meter, and this often causes difficulties for novice home craftsmen. The ability to correctly select and calculate the amount of edged or unedged lumber in a cube will allow you to save money and avoid a situation where, after completion construction work There is a pile of unused boards left on the site.

Classification and characteristics of lumber

The very name “lumber” suggests that this type of construction raw material is obtained by longitudinal sawing of tree trunks on circular or band saws. Several cutting methods are used to produce boards and timber:

  • tangential (in a circle),
  • radial.

Tangential cutting involves moving the saw tangentially to the annual rings of the tree, which reduces the amount of waste and, therefore, reduces the cost of building materials. The boards obtained in this way have a beautiful, pronounced pattern, therefore they are often used for finishing purposes. Disadvantages of circular sawing include the tendency of the wood to shrink and swell, as well as a significant difference in texture as it approaches cutting tool to the center of the log.

In the sawmill industry, several methods of sawing a trunk are used.

With radial sawing, the cutting line passes through the core of the tree, so the yield of boards will be smaller, and their price will be higher. However, if it is necessary to obtain high-quality wood, this method is used. This is due to the fact that, compared to the tangential method, radial sawing boards have halved swelling and shrinkage rates. In addition to the cutting methods discussed above, a mixed method is also used, which combines the advantages of the first two.

The concept of lumber actually includes not only traditional timber, which is most often seen in construction markets. Full list products obtained by sawing logs include:

  • board;
  • beam;
  • bar;
  • lagging;
  • croaker

The last two types of lumber are classified as waste, which absolutely does not prevent them from being used for certain types of construction work, as well as for finishing purposes.

Boards

Boards include lumber rectangular section with a thickness of no more than 100 mm and a width to thickness ratio of no less than 2:1.

Depending on the degree of processing, the board can be edged or unedged. The first is a finished product without bark and with smoothly sawn edges, while the second is a “semi-finished product” removed directly from the saw frame.

The edged board has smooth edges and a constant width along the entire length of the lumber The most commonly used boards in construction are::

  • standard sizes
  • thickness - 25 mm, 40 mm, 50 mm, 60 mm;
  • width - from 75 to 275 mm with gradation every 25 mm;

length - from 1 m to 6.5 mm in increments of 250 mm.

Boards of other sizes can be obtained by trimming or planing standard lumber, as well as by placing an individual order for sawing round timber. Unedged boards have a lower cost, but without finishing

its scope of application is limited The parameters of lumber used in construction are standardized and determined according to current GOST

8486–86 for coniferous wood and GOST 2695–83 for hardwood.

timber Timber is lumber whose cross-section is a square with sides of at least 100 mm. The standard defines the length of products of this type from 2 to 9 m, but most often square-section lumber with a length of no more than 6 m is used. In some cases, products with a cross-section of 150x100 mm, 200x100 mm or 200x150 mm, which according to the existing classification are much closer, are mistakenly classified as timber to the sleepers.

The timber is ideal material for the construction of frames and other wooden structures

The bar differs from the beam discussed above only in that its cross-section does not exceed 100x100 mm. The typical length of the bar is also 6 m, and the diameter ranges from 40 mm to 90 mm in increments of 10 mm. To simplify the classification, bars are often classified as slats whose cross-section has rectangular shape , and the ratio of thickness to width is at least 1:2. Standard range of wood slats edges coniferous species

looks like this: 16, 19, 22, 25, 32, 40, 44, 50, 60, 75 mm. For hardwood lumber, products of increased width are additionally provided, and the product line itself looks like this: 19, 22, 25, 32, 40, 45, 50, 60, 70, 80, 90, 100 mm.

A variety of bars and slats allow you to strengthen and make any wooden structure as stable as possible.

Obapole and croaker Obapol is the very first cut of a round timber, the outer surface of which remains untreated. Unlike obapol, croaker can have a cut on half of the second side or alternating treated and untreated areas on the bark side. The importance of obapole and slab in construction is secondary, since it is unaesthetic appearance and reduced performance characteristics allow the use of lumber of this type only for auxiliary purposes. Most often, croaker and obapol are used as fastening material , as well as for the manufacture of formwork, lathing or flooring scaffolding . This material is also interesting in quality decorative material

for decorating walls, fences and other vertical structures.

Despite their external ugliness, croaker and obapole are widely used for minor construction tasks

Technology for calculating the number of boards in a cube

The wood market offers both edged lumber and unedged boards, with wane remaining on the edges. Depending on the type of wood products, several methods are used to determine cubic capacity.

The algorithm for determining the cubic capacity of lumber is based on the formula known to every schoolchild for finding the volume of a rectangular parallelepiped. In order to find out the cubic capacity of one board (V) per cubic meter. m, you need to find the product of its length (a) by its width (b) and thickness (h) in meters V=a×b×h.

The desired figure will make it easy to calculate how many boards of this type will fit into one cubic meter of lumber. For this, 1 cu. m of lumber is divided by the volume of one product. For example, if you need to find out the cubic capacity of one board with parameters 6000x200x25 mm, then by substituting these numbers into the formula, we get V = 6x0.2x0.025 = 0.03 cubic meters. m. Consequently, in one cubic meter there will be 1/0.03 = 33.3 such products.

A tongue and groove board has a groove on one side and a tongue on the other. Since both of these elements are approximately equal to each other, their parameters can be neglected. That is why the cross-sectional size of tongue-and-groove lumber is measured without taking into account the locking part.

In the case of boards that have the same dimensions, the calculation can be simplified by substituting the dimensions of the stack of lumber into the formula. Of course, its installation should be as tight as possible, otherwise the gaps between separate elements will affect the accuracy of the calculations. Considering that the cost of individual types of wood reaches tens of thousands of rubles, such an error can cost a pretty penny.

To simplify calculations, you can use special tables that allow you to quickly determine the cubic capacity or the amount of wood in 1 cubic meter. m of lumber.

Table: number of edged boards in 1 cubic meter. m of standard length lumber

Board size, mmNumber of boards 6 m long in 1 cubic. mVolume of one board, cubic meters. m
25x10066,6 0.015
25x15044,4 0.022
25x20033,3 0.03
40x10062,5 0.024
40x15041,6 0.036
40x20031,2 0.048
50x10033,3 0.03
50x15022,2 0.045
50x20016,6 0.06
50x25013,3 0.075

The cubic capacity of timber of standard sizes can also be determined using the table below.

Table: amount of timber in 1 cubic meter. m of lumber

Beam size, mmNumber of products 6 m long in 1 cubic. mVolume of 1 beam, cubic. m
100x10016.6 0.06
100x15011.1 0.09
100x2008.3 0.12
150x1507.4 0.135
150x2005.5 0.18
150x3003.7 0.27
200x2004.1 0.24

Very often it is necessary to determine the surface area (floor or wall) that can be covered with a board of one thickness or another with a volume of 1 cubic meter. m. To do this, you can use the formula S = 1/h, where h is the thickness of the lumber. So, one cubic meter of 40 mm board will be enough to arrange S = 1/0.04 = 25 square meters. m of floor. To facilitate the process of calculating the area, a table called a cubeturner allows you to simplify the process of calculating the area. It contains data on the cross-section of the boards, their number in 1 cubic meter. m and the required area that they can cover.

Method for calculating the cubic capacity of an unedged board

Unedged lumber is not trimmed at the edges, so not only the size in diameter differs individual products, but also the width of different parts of one board. In this regard, it is possible to calculate the volume of a stack of unprocessed lumber only approximately. The same applies to calculating the cubic capacity of individual unedged lumber, although the error in this case will be much smaller.

So, to calculate the cubic capacity unedged boards There are two constant quantities - thickness and length, and one variable - width. To avoid complex calculations using differential algebra methods, the last parameter is simply averaged. To do this, the board is measured in several places and the arithmetic average is found. For example, for a board with a diameter of 400 mm at the base, 350 mm in the middle and 280 in the top, the calculated value will be (430+340+260)/3=343 mm. Further calculations are carried out in exactly the same way as for edged lumber.

Most often, the width of an unedged board is determined only on the basis of measurements along the edges of the lumber. It should be noted that the accuracy of calculations directly depends on the number of measurements, so in critical cases their number is increased.

If you need to find out the cubic capacity of a package of unedged wood, then the products are stacked on top of each other in such a way that the following conditions are met:

  • the stacks must be aligned along the front end;
  • boards in a stack should not be stacked overlapping;
  • It is not allowed to change the width of the package along the entire length of the lumber;
  • the protrusion of the outermost products beyond the stack should not exceed 100 mm.

By measuring the height, length and width of a package of unedged wood with a tape measure, the approximate cubic capacity is determined using the formula V=a×b×h. To find out more exact value, the resulting result is multiplied by the stacking coefficient, which can be found in special tables.

This question is the most pressing when it comes to building a house from a log. How to calculate the cubic capacity of a house yourself? How to check the declared forest cubes in the estimate from the developer?

Here is a table showing the cubic capacity of round timber depending on the diameter of the log. These calculations are given in accordance with GOST 2708-75, which is valid in the territory Russian Federation since 1975. The table allows you to calculate how many cubes of round timber will be needed to build a house from logs from the manufacturer.

Standard length of logs used for the construction of log houses is 6 meters. Blanks of this length are most often used. Logs longer than 6 meters are very rarely used for the production of hand-cut houses.

Most often, the architect optimizes the log house according to the cutting map in such a way as to avoid (or minimize) the use of long lengths. It is technically impossible to produce a rounded log over 6 meters.
Below in the table you can see a block of round timber, and for your convenience, we have highlighted a column of 6-meter blanks.

Table for calculating the cubic capacity of round timber with a diameter of 10 to 100 cm and a length of 3 to 8 meters


3.5 m 4 m 4.5 m 5 m 5.5 m 6 m 6.5 m 7 m 7.5 m 8 m
0,026 0,031 0,037 0,044 0,051 0,058 0,065 0,075 0,082 0,09 0,1
D 11 cm 0,032 0,037 0,045 0,053 0,062 0,07 0,08 0,09 0,098 0,108 0,12
D 12 cm 0,038 0,046 0,053 0,063 0,073 0,083 0,093 0,103 0,114 0,125 0,138
D 13 cm 0,045 0,053 0,062 0,075 0,085 0,097 0,108 0,12 0,132 0,144 0,158
D 14 cm 0,052 0,061 0,073 0,084 0,097 0,11 0,123 0,135 0,15 0,164 0,179
D 15 cm 0,06 0,071 0,084 0,097 0,11 0,125 0,139 0,153 0,169 0,182 0,199
D 16 cm 0,069 0,082 0,095 0,11 0,124 0,14 0,155 0,172 0,189 0,2 0,22
D 17 cm 0,077 0,092 0,107 0,124 0,14 0,157 0,174 0,191 0,209 0,225 0,25
D 18 cm 0,086 0,103 0,12 0,138 0,156 0,175 0,194 0,21 0,23 0,25 0,28
D 19 cm 0,097 0,115 0,134 0,154 0,173 0,193 0,212 0,235 0,255 0,275 0,305
3.0 m 3.5 m 4.0 m 4.5 m 5.0 m 5.5 m 6.0 m 6.5 m 7.0 m 7.5 m 8.0 m
D 20 cm 0,107 0,126 0,147 0,17 0,19 0,21 0,23 0,26 0,28 0,3 0,33
D 21 cm 0,119 0,14 0,163 0,185 0,21 0,23 0,255 0,285 0,31 0,335 0,365
D 22 cm 0,134 0,154 0,178 0,2 0,23 0,25 0,28 0,31 0,34 0,37 0,4
D 23 cm 0,114 0,169 0,194 0,22 0,25 0,275 0,305 0,335 0,37 0,4 0,435
D 24 cm 0,157 0,184 0,21 0,24 0,27 0,3 0,33 0,36 0,4 0,43 0,47
D 25 cm 0,171 0,197 0,23 0,26 0,295 0,325 0,36 0,395 0,43 0,465 0,505
D 26 cm 0,185 0,21 0,25 0,28 0,32 0,35 0,39 0,43 0,46 0,5 0,54
D 27 cm 0,203 0,23 0,27 0,305 0,345 0,38 0,42 0,46 0,495 0,54 0,585
D 28 cm 0,22 0,25 0,29 0,33 0,37 0,41 0,45 0,49 0,53 0,58 0,63
D 29 cm 0,235 0,27 0,31 0,355 0,395 0,44 0,485 0,525 0,57 0,62 0,675
3m 3.5 m 4 m 4.5 m 5 m 5.5 m 6 m 6.5 m 7 m 7.5 m 8 m
D 30 cm 0,25 0,29 0,33 0,38 0,42 0,47 0,52 0,56 0,61 0,66 0,72
D 31 mm
0,265 0,31 0,355 0,405 0,45 0,5 0,555 0,6 0,655 0,72 0,77
D 32 cm 0,28 0,33 0,38 0,43 0,48 0,53 0,59 0,64 0,7 0,76 0,82
D 33 cm 0,3 0,35 0,405 0,46 0,51 0,565 0,625 0,68 0,74 0,805 0,87
D 34 cm 0,32 0,37 0,43 0,49 0,54 0,6 0,66 0,72 0,78 0,85 0,92
D 35 cm 0,34
0,395 0,455 0,515 0,57 0,635 0,7 0,76 0,83 0,9
0,97
D 36 cm 0,36 0,42 0,48 0,54 0,6 0,67 0,74
0,8 0,88 0,95 1,02
0,375
0,44 0,505 0,57 0,635 0,705 0,78 0,85 0,925 1,0 1,075
D 38 cm 0,39
0,46 0,53 0,6 0,67 0,74 0,82 0,9 0,97
1,05 1,13
D 39 cm 0,41
0,48 0,555 0,63 0,705 0,78 0,86 0,945 1,02 1,105 1,19
3m3.5 m4 m4.5 m5 m5.5 m6 m6.5 m7 m7.5 m8 m
0,43
0,5 0,58 0,66 0,74 0,82 0,9 0,99 1,07 1,16 1,25
D 41 cm 0,45 0,53 0,61 0,695 0,775 0,86 0,95 1,035 1,125 1,22 1,315
D 42 cm 0,47
0,56 0,64 0,73 0,81 0,9 1,0 1,08 1,18 1,28 1,38
D 43 cm 0,495
0,585 0,67 0,765 0,85 0,945 1,045 1,14 1,24 1,34 1,34
D 44 cm 0,515
0,61 0,7 0,8 0,89 0,89 1,09 1,2
1,3
1,4 1,51
D 45 cm 0,543
0,64 0,735 0,835 0,935 1,035 1,14 1,25 1,355 1,465 1,48
D 46 cm 0,57
0,67 0,77 0,87 0,98 1,08 1,19 1,3 1,41 1,53 1,65
D 47 cm 0,595
0,7 0,805 0,91 1,02 1,13 1,245 1,355 1,475 1,6 1,725
D 48 cm 0,62
0,73 0,84 0,95 1,06 1,18 1,3 1,41 1,54 1,167 1,8
D 49 cm 0,645
0,76
0,875 0,99 1,105 1,23 1,355 1,475 1,605 1,74 1,875
3m3.5 m4 m4.5 m5 m5.5 m6 m6.5 m7 m7.5 m8 m
D 50 cm 0,67
0,79 0,91 1,03 1,15 1,28 1,41 1,54 1,67 1,81 1,95
D 51 cm 0,7
0,825 0,95 1,075 1,2 1,335
1,47 1,605 1,74 1,89 2,035
D 52 cm 0,73
0,86 0,99 1,12 1,25 1,39 1,53 1,67 1,81 1,97 2,12
D 53 cm 0,765
0,895 1,03 1,165
1,3 1,445 1,59 1,735 1,885 2,045 2,205
D 54 cm 0,8
0,93 1,07 1,21 1,35 1,5 1,65 1,8 1,96 2,12 2,29
D 55 cm 0,83
0,97 1,115 1,26 1,405 1,56 1,715 1,875 2,035 2,2 2,375
D 56 cm 0,86
1,01 1,16 1,31 1,46 1,62 1,78 1,95 2,11 2,28 2,46
D 57 cm 0,89
1,045 1,205 1,36 1,515 1,68 1,875 2,015 2,19 2,365 2,545
D 58 cm 0,92
1,08 1,25 1,41 1,57 1,74 1,91 2,08 2,27 2,45 2,63
D 59 cm 0,955
1,12 1,29 1,46 1,625 1,8 1,98 2,155 2,345 2,535 2,72
3m3.5 m4 m4.5 m5 m5.5 m6 m6.5 m7 m7.5 m8 m
D 60 cm 0,99
1,16 1,33 1,151 1,151 1,86 2,05 2,23 2,42 2,62 2,81
D 61 cm 1,025
1,2 1,38 1,565 1,74 1,925 2,115 2,3 2,495 2,7 2,9
D 62 cm 1,06 1,24 1,43 1,62 1,8 1,99 2,18 2,37 2,57 2,78 2,99
D 63 cm 1,095
1,285 1,475 1,67 1,855 2,05 2,25 2,445 2,65 2,865 3,08
D 64 cm 1,13
1,33 1,52 1,72 1,61 2,11 2,32 2,52 2,73 2,95 3,17
D 65 cm 1,165
1,365 1,565 1,77 1,965 2,17 2,38 2,59 2,805 3,03 3,275
D 66 cm 1,2
1,4 1,61 1,82 2,02 2,23 2,44 2,66 2,88 3,11 3,38
D 67 cm 1,235
1,445 1,655 1,87 2,075 2,29 2,505 2,735 2,965 3,21 3,485
D 68 cm 1,27
1,49 1,7 1,92 2,13 2,35 2,57 2,81 3,05 3,31 3,59
D 69 cm 1,305
1,53 1,75 1,97 2,19 2,415 2,645 2,89 3,14 3,41 3,695
3m3.5 m4 m4.5 m5 m5.5 m6 m6.5 m7 m7.5 m8 m
D 70 cm 1,34
1,57 1,8 2,02 2,25 2,48 2,72 2,97 3,23 3,51 3,8
D 71 cm 1,375
1,615 1,85 2,08 2,315 2,55 2,795 3,055 3,325 3,615 3,91
D 72 cm 1,41
1,66 1,9 2,14 2,38 2,62 2,87 3,14 3,42 3,72 4,02
D 73 cm 1,45
1,705 1,955 2,2 2,45 2,695 2,95
3,23 3,52 3,82 4,135
D 74 cm 1,49
1,75 2,01 2,26 2,52 2,77 3,03 3,32 3,62 3,92 4,25
D 75 cm 1,53
1,8 2,065 2,325 2,595 2,845 3,115 3,415 3,715
4,03 4,365
D 76 cm 1,57
1,85 2,12 2,39 2,67 2,92 3,2 3,51 3,81 4,14 4,48
D 77 cm 1,615
1,9 2,18 2,455 2,745 3,0 3,29 3,605 3,925 4,255 4,6
D 78 cm 1,66
1,95 2,24 2,52 2,82 3,08 3,38 3,7 4,04 4,37 4,72
D 79 cm 1,7
2,0 2,295 2,59 2,895 3,16 3,475 3,8 4,15 4,485 4,835
3m3.5 m4 m4.5 m5 m5.5 m6 m6.5 m7 m7.5 m8 m
D 80 cm 1,74
2,05 2,35 2,66 2,97 3,24 3,57 3,9 4,26 4,6 4,95
D 81 cm 1,785
2,1 2,41 2,73 3,05 3,325 3,66 4,005 4,365 4,51 5,085
D 82 cm 1,83
2,15 2,47 2,8 3,13 3,41 3,75 4,11 4,47 4,82 5,22
D 83 cm 1,875
2,205 2,53 2,87 3,205 3,495 3,845 4,215 4,585 4,495 5,345
D 84 cm 1,92 2,26 2,59 2,94 3,28 3,58 3,94 4,32 4,7 5,07 5,47
D 85 cm 1,965
2,315 2,65 2,985 3,34 3,675 4,035 4,43 4,82 5,195 5,595
D 86 cm 2,01
2,37 2,71 3,03 3,4 3,77 4,13 4,54 4,94 5,32 5,72
D 87 cm 2,06
2,425 2,78 3,13 3,5 3,86 4,235 4,655 5,06 5,445 5,86
D 88 cm 2,11
2,48 2,85 3,23 3,6 3,95 4,34 4,77 5,18 5,57 6,0
D 89 cm 2,16
2,535 2,915 3,3 3,685 4,045 4,45 4,88 5,3 5,7 6,135
3m3.5 m4 m4.5 m5 m5.5 m6 m6.5 m7 m7.5 m8 m
D 90 cm 2,21
2,59 2,98 3,37 3,77 4,145 4,56 4,99 5,42 5,83 6,27
D 91 cm 2,255
2,65 3,045 3,45 3,45 4,24 4,67 5,105 5,545 5,96 6,41
D 92 cm 2,3
2,71 3,11 3,53 3,94 4,34 4,78
5,22 5,67 6,09 6,55
D 93 cm 2,355
2,77 3,18 3,605 4,025 4,43 4,89 5,345 5,795 6,225 6,69
D 94 cm 2,41
2,83
3,25 3,68 4,11 4,52 5,0 5,47 5,92 6,36 6,83
D 95 cm 2,46 2,89 3,32 3,76 4,2 4,625 5,11 5,58 6,045 6,495 6,975
D 96 cm 2,51
2,95 3,39 3,84 4,29 4,73 5,22 5,69 6,17 6,63 7,12
D 97 cm 2,565
3,01 3,46 3,92 4,38 4,83 5,335 5,81 6,3 6,77 7,28
D 98 cm 2,62
3,07 3,53 4,0 4,47 4,93 5,45 5,93 6,43 6,91 7,44
D 99 cm 2,67
3,135 3,6 4,085 4,56 5,035 5,565 6,06 6,565 7,055 7,585
D 100 cm 2,72
3,2 3,67 4,17 4,65 5,14 5,68 6,19 6,7 7,2 7,73

How is the cubic capacity of a wooden house calculated during preliminary calculations?

First you need to calculate how many blanks are needed to build a house from a log. IN finished projects from “THE ABC OF THE FOREST” this information is contained in the “Cutting Cards” section. The photo below shows summary information for construction by.

This data is for a rounded log with a diameter of 240 mm and a length of 6 meters. We see from the cutting map that for construction we will need 547 blanks, when converted to Cubic Meters according to the table presented above, it turns out to be 146.71 m3. These data are automatically calculated by the AT - WENTS program.

The program in which our architects design wooden houses gives the exact cubic capacity without window and door openings, taking into account all design features wooden house. It is almost impossible to achieve such accuracy with manual calculations.

547*0.33= 180.51 m3.

Thus, we got the result taking into account the lunar groove - the log, relatively speaking, is calculated as a cylinder, and the program calculates minus the lunar groove.

This calculation once again proves the importance of a professional project and the availability of cutting maps, which allow you to very accurately calculate the amount of logs and lumber and rationally use the construction budget. But for approximate calculations to understand the order of prices, this method is very informative.

Mathematical method for calculating the cubic capacity of a wooden house (with a practical example)

What to do if you liked the house in the picture, and you don’t have a complete project, much less a cutting map? In this case, you need to be patient and manually calculate the length of all the logs according to the plan. It must be understood that in this case the error with the real result can be significant, and in both directions.

The task is to calculate how many blanks are needed to build a house from a log. The standard length of a log, as we have previously informed you, often does not exceed 6 meters. It is very important at this stage to determine the height of the floors! And according to this, calculate the number of crowns.

To do this, we need a table of the height of the log profile depending on the diameter. It is presented below. We count the length of all crowns (logs), including pediments, and divide the resulting number by 6.

Round log profile height
Log diameter, mm Crown height, m Crown height, mm
220 0,1905 190,5
240 0,2078 207,8
260 0,2252 225,2
280 0,2425 242,5
300 0,2598
259,8
320 0,2771 277,1
340 0,2944 294,4
360 0,3225 322,5
380 0,3399 339,9
400 0,3572 357,2

EXAMPLE:

Let's assume that we want to build a house from chopped logs with a diameter of 320 mm. One full floor, the second floor is an attic.

Important! The average height of the first floor of any log house before shrinkage is 3.2 m, the height of the attic wall in the attic is on average 1.5-1.7 m. After shrinkage, the height of the walls will decrease by approximately 7-10%, so this must be taken into account in the initial calculations . It is also necessary to take into account the composition of the floor of the first and second floors. A competent architect will always tell you how to do this correctly.
So, in our example:
  • First floor before shrinkage: 12 crowns, which will be equal to 3.33 m.
  • Attic wall in the attic before shrinkage: 6 crowns, which is equal to 1.66 m.

Now we need the length of the walls of each floor. To do this, it is necessary to calculate the perimeter of all walls (load-bearing and internal) according to the plan.

Let's assume that the length of the first floor is 100 linear meters, and the length attic floor amounted to 85 m.p.This is the result without subtracting window and door openings. If you need a more accurate number, then you need to calculate all openings in length and height and subtract them from the total number.

We will consider a more simplified version of calculating the cubic capacity of a log house from the manufacturer.

So,
  • First floor 100 m*12 crowns = 1200 m.p.
  • Attic floor 85 m * 6 crowns = 510 m.p.
So, the total length of the walls: 1200+510=1710 m.p.

Thus, we received the total length of the walls only, without taking into account gables, balconies, terraces, vertical support pillars, log trusses and other elements that may be included in the house design.

Important! To the resulting cubic capacity result, you need to add 5%, which will be for figured log releases and ridge logs. Exact number depends on the diameter of the log and the cutting method. For approximate calculations, we will limit ourselves to 5%.
So, we divide the resulting length by 6 meters and get 1718 /6 = 286.33 pcs. Thus, to erect walls in our log house, 287 blanks will be required. We multiply this number by 0.59 (data from the “Table for calculating the cubic capacity of round timber”) and get169.33 m3.

We need to add pediments to the resulting cubic capacity. Them in the very simple case 2, they are triangular. The area of ​​2 triangles will be approximately equal to the area of ​​the rectangle. Therefore, we calculate the length of one wall, where the pediment is. We multiply by the number of crowns and get the length of the log in both gables. Divide the result by 6.

Important! The sum of the attic crowns and gables is equal to the height of the first floor. Therefore, if we have 12 crowns on the first floor, and 6 crowns in the attic, then there will be 6 crowns in the gables (12–6=6).
Let's assume that the length of the pediment is 11 meters, we have 6 crowns. This means that 11 * 6 = 66 m. Divide by 6, we get 11 pieces. 11 *0.59 = 6.49 m3

Thus, the cubic capacity of our house made of logs with a diameter of 320 mm is 169.33 + 6.49 = 175.82 m3. When rounded we got 176 m3.

It was possible to go the other way around, first count the number of all blanks, and then convert them into cubic meters. Let's check our result in this way:

287 (blanks for walls) + 11 (blanks for gables) = 298 * 0.59 = 175.82 m3, rounded, 176 m3.

That is, everything was calculated correctly.

Important! Don't forget that this is not the final result yet. You need to study the sketch and if there are terraces, balconies and vertical pillars, they need to be added to total number. We count this manually, because... The calculation you and I have is mathematical. For example, if there are pillars, then each pillar is considered one 6-meter blank of the required diameter. We also consider terrace fencing, cut-overs, chopped trusses and other elements.

Now you know how to calculate the cubic capacity of a log house or a house made of rounded logs. If you DO NOT want to deal with complex calculations yourself, contact our specialists! We will make a detailed estimate for you. This is a free service and does not oblige you to anything.

When ordering a house project made from rounded logs, all lumber will be automatically calculated as accurately as possible.

Ready-made projects of houses and baths from "AZBUKA LESA" are presented in our.

To receive an estimate, send a plan of your future home to

In the letter, indicate the desired diameter of the log, the expected height of each floor, construction technology and other data that the manager needs to know to draw up an accurate estimate.

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