Approaches and techniques for analyzing lumber grades


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Croaker in comparison with other lumber
Obapol
(pronounced "obápol")
- according to Pedivicia, a cut-to-size sawn product obtained from the side of a log when sawing it. If the convex side of the obafloor is not sawn or sawn less than 1/2 of the length, the obafloor is called slab; if the convex side is sawn by more than 1/2, it is plank. Obapol is used for the production of scaffolding, formwork, fastening material, as well as yums for termites and other things.

What is obasexual

Unusual for a modern person previously had many meanings, in which it is sometimes used in some regions of Russia, mainly by old-timers. In the old days, “obapol” meant “nearby” or “around,” which is where the name of the type of lumber comes from: the outer parts of a log formed when it is cut into boards and beams.

According to the Soviet GOST, which is still in force today, obapol is lumber obtained from the side of a log and sawn completely on one side. The second, convex, can be partially sawn or retain its original appearance. If the cut occupies more than half the length, such materials are called planks; if less, they are called hunchbacks.

This type of lumber is never purposefully produced and is therefore referred to as a by-product of sawing logs. Due to this, both sexes have a very low price, which makes them extremely attractive to people with a developed imagination. But its supply on the market is limited due to its unique appearance, so it can be difficult to get hold of.

How is croaker made?

Slab boards are obtained when, when processing a log, a layer of a certain thickness is cut from its side. In such work, only the thickness of the resulting material is important, and the resulting boards with a convex side are waste. However, the complex sawing process can be made more profitable by using everything, including the leftovers. Of course, to use obapol, you have to pre-treat it.

Most often, tree trunks are sawed on special machines that have 4 saw blades.

Control using programs allows you to configure the unit so that it simultaneously cuts the log from all sides. In this case, you can set the required thickness and length to be cut.

If a planer can simultaneously saw a log only from two opposite sides, then everything will be somewhat more complicated here, since after processing it will be necessary to rotate the workpiece along the axis in order to continue separating the slab. Sawing machines are on sale not only for industrial workshops, but also for private households.

The cheapest is considered to be the slab with the smallest thickness and width, because such boards cannot be processed using a sawmill. For more massive options, an antiseptic composition is applied to the bark so that the wood does not deteriorate, and then cut into the necessary pieces.

Textured and undamaged sections of obapol can be turned into lining. It is important here that it is initially of high quality.

You can also make a block house from such boards. In this case, you need to ensure that there are no more than 3-4 large branches per square meter of wood. The ability to make connecting grooves and tongues is also important. In this case, both floors can turn into a full-fledged log house, only cheaper and lighter. Moreover, this will not make its properties, both mechanical and physical, worse.

Where is obasexual used?


According to the technical documentation, obapol is suitable for the manufacture of scaffolding, formwork for monolithic concrete structures and strengthening of mine workings.
Based on the low cost of this type of lumber, this method of application is very profitable. But most obapol today is used as fuel for household stoves and boilers. This method of use can hardly be called rational, since not all types of wood burn well enough; in addition, even such lumber can be useful in construction. But in some regions it is the most profitable and affordable type of fuel. Obapol made from pine and other conifers produces an impressive amount of heat, ignites easily and is easy to store. In addition, this is an environmentally friendly type of fuel, which has only one drawback - a peculiar odor due to the combustion of resin.

Due to its low price and high strength, obapol made from larch and hardwood is excellent for self-construction of sheds, sheds and other outbuildings on the site. Provided that the quality of lumber, which can be produced, including from dead wood or sanitary felling, is of sufficient quality, the buildings will be strong and reliable. And additional hydro- and thermal insulation using roofing felt and cheap foam blocks will provide protection from difficult weather conditions to the property stored inside.

Obapol is very often used for the construction of fences. Here, again, affordable cost and good performance characteristics play a key role. Depending on your imagination and necessity, you can use these lumber to make either an unpretentious fence that will protect against penetration at minimal cost, or an unusual fence that will impress with its interesting appearance.

How to do it?

Video of the construction of a fence from slab:

Prepare materials and tools:

You need to build a slab fence at your dacha with your own hands in several stages:

Marking is necessary because without it it is impossible to build a beautiful slab fence.

Having marked the boundaries of the site, the line of the fence is marked and the installation points of the support pillars are indicated.

When constructing this type of fence, the following principle is used - attaching the boards to the support posts one after another.

You can install the fence in spans, that is, first knock down one completed span, and then attach it to posts.

But this method is heavier - the span weighs more than tens of kilograms, so most builders prefer the first option.

Holes are dug in the marked area to allow the installation of support pillars. They are buried by a third (for a one and a half meter fence, a hole half a meter deep is drilled).

A wooden pole is installed in the hole. The base is covered with crushed stone and filled with cement mortar.

Knocking down a fence

Knocking down a fence horizontally

There can be two options here - the boards are nailed vertically or horizontally:

Can be secured with nails or screws. You can nail the slab in a row or overlap.

Knocking down a fence vertically

The upper part can be decoratively trimmed with a jigsaw or saw, cut into a pattern or geometric shapes, or sharpened.

The finished fence may or may not be painted, but it must be processed. Especially if you didn’t pre-coat the boards with anything when preparing them.

What to process?

Wood processing products

Antiseptic for wood, stain and any composition available to you that can protect your structure from dampness, mold, fungi, beetles and natural influences.

After processing, if you do not want to paint over the wood texture, coat the surface with varnish.

This will extend the life of the fence for several more years.

Original use of larch obapol

Siberian larch is one of the most common building species, which is why a huge amount of lumber is produced from it every year. Along with profiled timber, floorboards and parquet, wood processing by-products are also produced in large volumes. So, there will be no problem in buying obapol from Siberian larch.

You can find many ways to use this original type of lumber. Because it retains a layer of bark, it can have an extremely attractive appearance when used correctly. A hull obapol made of larch without cutting along the convex layer, for example, can be used for the independent production of facing materials.

Larch obapol has the same performance characteristics as other types of lumber from this species, including strength and stability in any climatic conditions. Therefore, it can be successfully used to build your own boat docks and fishing spots: constant contact with water will not affect the strength and durability of the structure.

Another way to use materials of this kind can be the construction of gazebos. Low price, original appearance and high strength make this type of lumber a profitable solution for the independent production of garden furniture. The preserved texture of the wood will make tables and benches made from this material very decorative; they will fit well into the interiors of country houses, verandas and gazebos.

TYPES AND SIZES

1.1. Obapol is divided into slab and plank - according to GOST 18288.

1.2. The dimensions of both sexes must correspond to those indicated in the table. .

Table 1

Length, m Thickness, mm Width, mm
0,8; 0,9 30 — 35 90 — 200
1,0; 1,1; 1,2; 1,5 16 — 19; 19 — 25; 30 — 35 90 — 200
1,6; 1,8; 2,0; 2,1; 2,2; 2,5; 2,75 19 — 25; 30 — 35 90 — 200

Notes:

1. It is allowed to produce both floors with a width of up to 250 mm in thickness groups of 19 - 25 and 30 - 35 mm for the mines of the Primorsky Coal Basin and the mines of the Krasnoyarskugol production association.

2. By agreement between the manufacturer and the consumer, it is allowed to produce both floors with a length of 1.0 - 1.5 m and a width of 75 mm.

1.3. The thickness of the thick end of a plank obapol should be no more than one and a half thickness of the thin end, a slab obapol with a length of 0.8 - 1.2 m - no more than one and a half thickness, and a length of 1.4 - 2.75 m - no more than double the thickness of the thin end.

The thickness of the thick end of the obapol of all lengths for the mines of the Donetsk and Moscow Region coal basins should be no more than one and a half thickness of the thin end.

1.4. The thickness of the obapola along the entire length must be no less than the thickness of the thin end, taking into account permissible deviations.

1.5. The difference in the widths of the thick and thin ends of the obapole should not exceed 1/2 the width of the thin end.

1.6. Maximum deviations from the established dimensions, mm, are allowed:

± 2 — thickness;

± 30 - along the length.

CONTROL METHODS

4.1. The thickness of the obapole is measured at the thin end excluding the bark in the middle of its width. If in the middle of the thin end of the obapole there is a local change in the thickness of the obapole, then the measurement is carried out twice (at the edges of this change) and the size of the obapole is determined as the arithmetic mean of the results of two measurements.

4.2. The width of the floor is measured at the narrow end along the inner surface.

4.3. The length of the obapole is measured by the shortest distance between its ends.

4.4. The volume of an obapol is determined as the product of the length, width and height of a package or stack in folded cubic meters with conversion to dense cubic meters according to the conversion factors indicated in the table. .

Table 4

Length, m Thickness group, mm Conversion factor for both sexes
plank In a mixture of plank and slab croaker
debarked neo-indigenous debarked neo-indigenous
Obasexual conifers
0,8-1,6 16 — 19 0,68 0,65 0,62 0,62 0,56
19 — 25 0,70 0,67 0,64 0,63 0,57
30 — 35 0,72 0,70 0,67 0,67 0,61
1,8 — 2,75 19 — 25 0,68 0,65 0,61 0,61 0,55
30 — 35 0,70 0,67 0,64 0,63 0,57
Obasexual hardwood
0,8 — 1,6 19 — 25 0,61 0,60 0,57 0,56 0,53
30 — 35 0,63 0,62 0,59 0,61 0,54
1,8 — 2,75 19 — 35 0,60 0,59 0,56 0,57 0,52
30 — 35 0,63 0,61 0,59 0,58 0,54

Notes:

1. The conversion factor for a mixture of plank and croaker obapole is established when the content of croaker obapole in it is from 31 to 60%.

2. If the percentage of croaker obapole content in the mixture does not correspond to that specified in the note, the batch is sorted by type and accepted separately.

4.5. Measurement of packages and stacks is carried out in compliance with the following rules.

The length of packages and stacks is taken equal to the length of the laid flooring (permissible deviations are not taken into account).

The width of stacks of packages is determined as the arithmetic mean of the results of measurements of the width of the upper and lower bases and the middle height of the stack or package.

The height of the stacks is determined as the arithmetic mean of the height measurements every meter of width. In bags and short stacks, the number of measurements must be at least four.

When measuring the height of a stack and package, the thickness of the stacking pads and spacers is not taken into account.

The width and height of the stack and package are measured with an error of no more than 0.01 m, the volume in a dense and folded measure is calculated with an error of no more than 0.001 m3.

ACCEPTANCE RULES

3.1. Obapol is taken in batches.

A batch is considered to be any quantity of obapola of the same length, one thickness group, documented in one quality document.

3.2. To control the quality and size of both sexes, a sample of the size indicated in the table is selected. .

Table 3

Batch volume, m3 Sample size, pcs. Acceptance number for quality control
To 10 125 7
From 11 to 50 200 10
- " - 51 and above 315 14

3.3. The batch is accepted if the quantity of both sexes in the sample that does not meet the standard - in terms of quality or size - is less than or equal to the acceptance number indicated in the table. , and are rejected if the number of such assortments in the sample is greater than the acceptance number.

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