JP2018087411A - Structural plywood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide structural plywood being low in a moisture permeable resistance value of not causing indoor dew condensation indispensable for a woody house of not collapsing even if an earthquake repeatedly exists in seismic intensity of 7.SOLUTION: Hole-penetration structural plywood 101 is arranged in a zigzag shape by penetrating through a hole in respective points of an equilateral triangle of an angle of 60 degrees in 5-sheet-mating structure plywood. Hole-penetration is zigzag arrangement, and a first row becomes the apex of the equilateral triangle, and a second row becomes two points of a base, and is orderly regularly arranged in a zigzag shape, and becomes a straight line of connecting the hole penetration 11 and 12 of the apex and hole penetration 19, and becomes the straight line by connecting two points of the hole penetration 21 and 22 of the base of the second row and the other hole penetration 29. The hole penetration 21 and 22 of the base are the second row but also become the hole penetration 21 and 22 of the apex of a third row, and a fourth row or a fifth row and the hole penetration of the equilateral triangle are regularly orderly arranged in a zigzag shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structural plywood having a low moisture permeation resistance value by subjecting the structural plywood to hole penetration or hole machining.

Since the Tohoku earthquake on March 11, 2011, earthquakes have been increasing in various parts of the country.
In addition, according to news and newspaper reports, it is reported that there are many unknown active faults not only in the already known active faults in various parts of the country, but it is not possible to limit when and where earthquakes that lead to major disasters occur. is there.
Even in the Kumamoto and Tottori earthquakes that occurred in 2016, there are many buildings that are collapsed or tilted even in earthquake-resistant houses built according to the new earthquake resistance standards, and the safety and security of residents has not been secured yet It is no exaggeration to say that it continues.

Many wooden earthquake-resistant houses built to the new seismic standards use structural plywood with high wall magnification on the outer wall side, which is excellent for repeated earthquakes.
However, since the structural plywood has a high moisture permeability resistance value, there are many cases in which dew condensation starts to occur from the boundary surface between the filled heat insulating material and the structural plywood in the winter when the outside air temperature decreases, which is generally called winter type dew condensation.
There are winter-type condensation and summer-type condensation in the wall, and summer-type condensation is caused by cooling the room in the summer.
In any case, the old building used to be a wall or a large wall, but the materials that make up the wall were combined with a highly moisture permeable material. The wall structure of a typical wooden house is “Gypsum board ⇒ Moisture proof sheet ⇒ Thermal insulation ⇒ Structural plywood ⇒ Breathable waterproof sheet ⇒ Breathable layer ⇒ Exterior wall”.
However, even if a moisture-proof sheet is applied, it is difficult to complete a perfect construction, and moisture that has entered through a small gap due to half-finished construction causes winter-type condensation on the structural plywood surface, which accelerates the deterioration of the house. .
In addition, the actual situation in which summer-time dew condensation occurs on the moisture-proof sheet surface in the summer, causing decay of germs due to dew condensation in the wall, which is a major enemy of the house, has deteriorated and the life of the house has been shortened. .

Moisture permeability resistance value of wall constituent material (Engineering unit: m ² · h · mmHg / g) From a specialized book • 9 mm OSB ⇒ 31, 6
・ 9mm structural plywood⇒16,8
・ 60mm earth wall⇒6,1
・ 12mm inorganic material face material⇒3,0
・ 9mm gypsum board⇒0,45
・ 100mm glass wool⇒0,012
・ 100mm rock wool⇒0,012
・ 0.1mm polyethylene moisture-proof sheet⇒300
・ 0,2mm breathable waterproof sheet⇒0,4

The OSB and the structural plywood that are frequently used as earthquake-resistant surface materials among the above-mentioned wall constituting materials have a high moisture permeability resistance value due to the adhesive used at the time of manufacture.
That is, the wood material itself has a high moisture permeability resistance value even if the moisture permeability resistance value is low.
Therefore, for earthquake-resistant houses, how to reduce the problem of high moisture permeability resistance, which is the only weakness of structural plywood that is excellent in repeated earthquakes and is cheap and advantageous, and if this problem can be solved, the wall Moisture that has entered the inside easily escapes and condensation in the walls hardly occurs.
What is important is that if a wall structure with high airtightness and heat insulation performance and breathing is possible, there is no concern about condensation in the wall throughout the year, so that the life of the house can be extended.

According to the moisture permeability test data, 1m ² of 9mm gypsum board is 300cc in the evaluation experiment during the winter season, and the same 1m ² 9mm gypsum board with a hole penetration area of 2 square centimeters is 3000cc, 10 times moisture permeability. Is possible.
It shows that the 1m ² 9mm structural plywood has almost no moisture permeation of 10cc and the perforated area of 2 square centimeters allows about 3000cc of moisture permeation. Pay attention.
We entered a structural plywood with low moisture permeability resistance or a structural plywood with a hole through it and searched it using JPlatPat, but we could not find it.

  As mentioned in the above technical background, structural plywood has a large wall magnification and is excellent for repeated earthquakes. It is cheap for earthquake-resistant houses and earthquake-resistant repairs, but it has a weak moisture resistance value compared to other face materials. When condensation occurs on the surface of the structural plywood, the heat insulating material also gets wet, and the heat insulation performance is extremely lowered, resulting in a vicious cycle of condensation in the wall.

This dew condensation in the walls rots the foundations, pillars, studs and joints, which are the main structural frames, and destroys the entire building. The entire building is seriously damaged, and this leads to the collapse of the house during the earthquake.

  The present invention establishes a wall construction method for breathing that does not cause condensation in the wall by lowering the moisture resistance value, which is a weak point of a structural plywood that is inexpensive and advantageous for earthquake-resistant houses, and is spreading and spreading to society. The purpose of the present invention is to provide a structural plywood having a low moisture permeability resistance value that is essential for a wooden house that does not collapse even if there are repeated earthquakes with a seismic intensity of 7.

In order to achieve the above object, the present invention takes the following technical means.
First,
In order to reduce the moisture permeation resistance value, both surfaces of the structural plywood are perforated.
Alternatively, a structural plywood was formed in which holes were processed up to the final bonding surface of the structural plywood, but only the plate surface of the final layer did not penetrate the hole.

Second,
The circular hole penetration was a structural plywood that penetrated the holes in a staggered arrangement having a regular triangle or an inverted regular triangle with an angle of 60 degrees.

Third,
The circular hole was formed as a structural plywood having holes formed in a staggered arrangement having a regular triangle or an inverted regular triangle with an angle of 60 degrees.

Fourth,
The processing surface range of the hole penetration or hole processing was a plywood for structure excluding the fixing range width that is attached and fixed to the base, pillar, stud, trunk, beam, or frame by nails, screw nails, or adhesion.

Hole penetration and drilling to lower the moisture permeation resistance value are weaker than the initial strength of the structural plywood before processing, so in order to maintain the initial strength or ensure the required strength, the hole diameter of the hole penetration and drilling It is also necessary to control the shape of the staggered array and to limit the strict technical standards and quality standards based on the relationship between the required moisture permeability and the required value of the wall plywood. It goes without saying that it must be produced in
The plywood has JIS standards for the number of layers for each thickness and is as follows, but the standard number of layers for general structural plywood is five.
・ Plywood thickness of less than 15mm is a combination of 3 sheets or more ・ Plywood thickness is 15mm or more and less than 18mm is a combination of 4 sheets or more ・ Plywood thickness is 18mm or more and less than 24mm is a combination of 5 sheets

  If it is a wood type house built using the structural plywood of the present invention, it becomes a wall structure to breathe and can provide an earthquake resistant house that is long-life and does not cause condensation in the wall and is strong against earthquakes.

Conceptual diagram of a staggered arrangement of holes penetrating with a plan view and a cross-sectional view of a plywood for a hole penetrating structure Conceptual diagram of a staggered arrangement of drilling holes with a plan view and a cross-sectional view of a plywood for drilling structure

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and Example 1, and FIG.

FIGS. 1A and 1B of the first embodiment are structural plywoods 101 in the middle of processing in which five regular plywoods are arranged in a zigzag pattern through holes of 60 ° angle equilateral triangles.
In the zigzag arrangement of the through holes, the first row is the apex of the equilateral triangle, the second row is the bottom two points, and is regularly and regularly arranged in a staggered manner, and the apex hole penetrations 11 and 12 and the hole penetration 19 are connected. It is a straight line.
If two points of the hole penetrations 21 and 22 at the bottom of the second row are connected to another hole penetration 29, a straight line is formed.
The hole penetrations 21 and 22 on the bottom side are in the second row, but are also the hole penetrations 21 and 22 at the apex of the third row, and the hole penetrations in the fourth row, the fifth row, and the equilateral triangle are regular and orderly arranged. A plywood 101 is provided.

FIG. 1B is a cross-sectional view illustrating the hole penetrations 11 and 12 of the five-layer structural plywood 101.
The hole diameter of the through hole and the dimension of one side of the equilateral triangle are determined by the required moisture permeation resistance value and the strength value of the structural plywood 101. However, increasing the hole diameter and shortening the dimension of one side of the equilateral triangle are for structural purposes. The strength value of the plywood 101 is reduced.
Therefore, if the hole diameter of the through hole and the dimension of one side of the equilateral triangle cannot maintain the strength value of the structural plywood 101 in terms of quality, the moisture permeation resistance value required by selecting the upper layer or the thickness above it is selected. And strength value will be secured.

There are several possible methods for drilling holes. However, the present invention is not limited to the above-described processing methods such as production with a processing machine in which many drills are arranged in a staggered manner or laser processing.
Moreover, although the hole diameter of the hole penetration is assumed to be approximately 5 mm, the condition is set for quality control including the dimension of one side of the equilateral triangle, and is not limited.
Next, the range of the machining surface for penetrating the holes is the plywood 101 for structure excluding the fixing range widths 95 and 99 for mounting and fixing to the base, pillar, stud, trunk, beam, or frame by nails, screw nails, adhesion, etc. It has become.
Note that FIG. 1A does not show the fixed range width of the stud portion.

FIGS. 2 (a) and 2 (b) of the second embodiment are structural plywoods 105 in the middle of processing in which each point of an inverted equilateral triangle with an angle of 60 degrees is formed in a staggered arrangement on five structural plywoods.
In the staggered arrangement of holes, the first row has two points on the bottom of the inverted equilateral triangle, the second row is the apex, and is regularly and regularly arranged in a staggered manner. When 49 is connected, it becomes a straight line.
A straight line is formed by connecting the hole processing 51 that is the apex of the inverted regular triangle in the second row and the other hole processing 59.
The top perforations 51 and 52 are in the second row, but the bottom perforations 51 and 52 in the third row are the same, and the fourth and fifth rows and the regular equilateral triangles are perforated in a regular and orderly manner. A plywood 105 is provided.

FIG. 2B is a cross-sectional view illustrating the hole drilling 41 and 42 of the five-layer structural plywood 105.
The hole diameter of the hole processing and the dimension of one side of the inverted equilateral triangle are determined by the required moisture permeability resistance value and the strength value of the structural plywood 105, but increasing the hole diameter and shortening the dimension of one side of the inverted equilateral triangle are The strength value of the structural plywood 105 is reduced.
Therefore, when the hole diameter of the hole processing and the dimension of one side of the inverted equilateral triangle cannot maintain the strength value of the structural plywood 105 in terms of quality, the moisture permeation resistance required by selecting the upper layer or the thickness above it is selected. Value and strength value will be secured.

There are several possible drilling methods, but many drills are produced on a staggered processing machine, but this is not a limitation.
Next, the range of the machining surface for drilling is the structural plywood 105 excluding the fixing range widths 85 and 89 for mounting and fixing to the base, pillar, stud, trunk, beam, or frame by nails, screw nails, adhesion, etc. It has become.
Note that FIG. 2A does not show the fixed range width of the stud portion.

Next, since the moisture permeation resistance value is high due to the adhesive used when manufacturing the structural plywood, the hole is drilled to a depth at which the adhesive is completely removed.
Therefore, the hole is drilled up to the final bonding surface of the structural plywood, but not the plate surface 100 of the final layer.
By this drilling method, one plate surface is staggered in the hole processing, but the plate surface 100 of the other final layer is a structural plywood 105 in a state without hole processing.

Although the hole diameter of the hole penetration of Example 1 or the hole processing of Example 2 is assumed to be about 5 mm, it is not limited in terms of quality control including the dimension of one side of an equilateral triangle or an inverted equilateral triangle.
Moreover, any processing method may be selected as long as the processing method of the second embodiment is a method that does not allow penetration.

The structural plywood of the present invention can be used for earthquake-resistant houses such as wooden houses, and the construction of non-condensing houses can further improve the safety, security and comfort of residents, thereby extending the healthy life expectancy. It is likely to lead to a reduction in medical costs.

11, 12, 19 Hole penetration 21, 22, 29 Hole penetration 41, 42, 49 Hole machining 51, 52, 59 Hole machining 85, 89 Fixed range width 95, 99 Fixed range width 100 Final surface plate surface 101 Hole penetration Structural plywood 105 Plywood structural plywood

Claims (4)

A structure characterized in that both sides of the structural plywood are perforated in order to reduce the moisture permeation resistance value, or the final bonding surface of the structural plywood is perforated, but only the surface of the final layer is not perforated. Plywood.   2. The structural plywood according to claim 1, wherein the circular through holes are formed in a staggered arrangement having a regular triangle or an inverted regular triangle with an angle of 60 degrees.   2. The structural plywood according to claim 1, wherein the circular hole processing is performed in a staggered arrangement having a regular triangle or an inverted regular triangle with an angle of 60 degrees. 2. The range of the machining surface for hole penetration or drilling is excluded from a fixed range width for mounting and fixing to a base, a pillar, a stud, a trunk, a beam, or a frame by a nail, a screw nail, or an adhesive. The structural plywood according to claim 3.