The cubic capacity of a log is the volume of wood material, measured in cubic meters. This value is used in the construction of wooden log houses to calculate the quantity of roundwood. It is important to determine the cubic capacity when selling firewood, where payment is made for each cubic meter of wood. How to calculate the volume of round cylindrical lumber correctly?
You need to know the cubic capacity of the tree when buying this building material, since payment is made for each cubic meter.
There are several ways to estimate the volume of roundwood or firewood. All tried and tested techniques use data of measurements of geometric dimensions and mathematical calculations. Roulette is traditionally used to measure construction values.
Table of calculation of cubic capacity of logs
The easiest way is to define cubic rectangular space in which the timber is complex. Such a place can be a dump truck or a barn. You can also calculate the geometric dimensions of the woodpile, if it is folded in the form of a neat rectangle.
Since the spatial cubature is not completely filled with a tree, the quantity being determined is reduced by the coefficient of voids. In construction calculations it is assumed that the coefficient of voids is equal to 0.8. That is, 20% of the space is occupied by air voids, and 80% by wood.
The cubic size is defined as follows:
This method is used to calculate the cubic capacity of logs of different sizes or boards, firewood.
Figure 1. Measurement of two perpendicular diameters in the beam section
If round wood characterized by the same length of logs and close diameter, then you can calculate the amount of 3 bars, reduce them to the average calculated value and multiply it by the amount of log material. In this case, the calculations are performed as follows:
V = Pi * R ^{ 2 } * L,
where Pi - the number equal to 3.14,
R is the radius equal to half the measured diameter,
L is the length of the beam.
Table for calculating the cubic capacity of logs and beams.
Since logs of similar diameter and standardized length are used for construction, this method is widely used to estimate the volume of construction timber.
If the form of a bar is slightly pressed down, its section in section will be not round, but slightly oval. How then to determine the value of the diameter? To do this, measure the size of 2 perpendicular diameters in the cross section of the beam: the largest and smallest. Further, the measured values are summed and divided by 2. The resulting value will be the average diameter used in the calculations (Fig. 1).
The calculation of the volume of round wood using tables consists of measuring the diameter and obtaining data from finished construction tables.
These directories contain structured information indicating the consumption of sawn timber of a given diameter for the construction of 1 m² wall. Such tables are the result of construction calculations and the established practice of determining the consumption of lumber. Therefore, they allow a fairly accurate estimate of the cubic capacity of the construction wood. A set of tables summarized in a single standardized document is called a GOST.
Most often, the tables are calculated for a rounded log, in which the top layer and bark are removed, the surface is aligned to the correct cylinder.
If you wish, you can use the data in the tables to determine the amount of un-pruned tree, making allowance for possible inaccuracies. Errors of the results will be associated with changes in the diameter of the cross section of the round timber over its length.
Independent calculation of the amount of roundwood allows you to verify the correctness of the price determination by the seller. It is economically feasible to check the team of contractors by conducting their own approximate calculations of the consumption of construction logs for the construction of the walls of the house.
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