JP2001207556A - Floor substrate board and floor substrate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the corrosion of a floor substrate board due to multiplication of decay bacteria by maintaining the floor substrate board in a low moisture condition and to prevent the harm caused by a harmful insect such as termites. SOLUTION: This floor substrate board is constituted by arranging a moisture-proof airtight sheet 3 on a rear surface of a plywood 1 through a wooden fiber board 2 having a hard layer on at least one face, and by bringing the hard layer of the wooden fiber board into contact with the moisture-proof airtight sheet. This floor substrate board is constructed on a structural member by setting the moisture-proof airtight sheet to be faced on dirt floor to constitute a floor substrate structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor board and an underfloor structure obtained by applying the underfloor board to a structural material.

[0002]

2. Description of the Related Art When laying floor materials in a living room of a house under construction, it is necessary to lay plywood or the like as a floor base plate on a joist and then lay various floor materials on the floor base plate. Have been done.

[0003]

However, according to such a conventional technique, when the floor base plate absorbs moisture, there is a problem that rot fungi preferring a place with high humidity grow and rot the floor base plate. .

[0004] In addition, such a high-humidity floor substrate sometimes collapses by being damaged by insects such as termites.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a floor base plate having a novel structure capable of solving the above-mentioned problems in the prior art, and a floor base structure formed by applying the floor base plate to a structural material. The purpose is to provide.

That is, in the floor substrate according to the present invention, a moisture-proof airtight sheet is arranged on the back surface of the plywood via a wood fiber board having a hard layer on at least one side, and the hard layer of the wood fiber board is brought into contact with the moisture-proof airtight sheet. It is constituted as follows.

[0007] In the floor base structure according to the present invention, a moisture-proof airtight sheet is disposed on the back surface of a plywood via a wood fiber board having a hard layer on at least one side, and the hard layer of the wood fiber board is bonded to the moisture-proof airtight sheet. And a floor base plate constructed so as to be in contact with the structural member so that the moisture-proof airtight sheet is located below the floor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a floor substrate according to an embodiment of the present invention. The floor substrate is provided on the back of a plywood 1 with a wood fiber board 2 having a hard layer at least on the back side. The airtight sheet 3 is provided, and the hard layer of the wood fiber board 2 is configured to be in contact with the moistureproof airtight sheet 3.

The plywood has a high bending strength and a property that it is difficult to bend, and an odd number of hardwood veneers or softwood veneers are used.
The veneers are laminated so that the fiber directions of the veneers are orthogonal to each other, and are bonded with an arbitrary adhesive.

[0010] The wood fiber board is generally manufactured by press-molding wood fibers obtained by defibrating wood chips obtained by cutting a hardwood or softwood base wood. In the present invention, a hard layer is formed on at least one surface thereof. The formed one is used. This hard layer is formed when a fiber mat obtained by forming a wood fiber is pressed and formed, and has a high specific gravity, is hard, and has low hygroscopicity.

The specific gravity of the wood fiber board is 0.6 to 1.1.
It is preferable to use a material having a size of about. When the specific gravity is less than 0.6, the strength against load becomes small when used as a floor substrate, making it unsuitable for practical use. Conversely, when the specific gravity exceeds 1.1, the weight increases and the floor substrate material increases. It becomes difficult to transport and handle during construction.

Preferably, the thickness of the wood fiber board does not exceed about 50% of the total thickness of the floorboard. When the wood fiber board occupies a majority of the entire thickness of the floor base board, it becomes difficult to restrain the dimensional change due to moisture absorption of the wood fiber board with the plywood, causing the floor base board to warp.

The moisture-proof airtight sheet is an airtight sheet that is impermeable to liquid water and gaseous water vapor and moisture, and is made of, for example, polyethylene foil on the front and back of a core layer composed of an aluminum foil or an aluminum vapor-deposited layer. A laminated sheet having a three-layer structure provided with a resin layer made of a synthetic resin such as a terephthalate (PET) resin, a vinyl chloride resin, a polypropylene resin, or a polyethylene resin can be used. However, this is only an example of the moisture-proof airtight sheet that can be used in the present invention, and the present invention is not limited to this. Any sheet can be used as long as it is moisture-proof and airtight.

The floor substrate of the present invention is obtained by bonding and laminating the plywood 1, the wood fiber board 2 and the moisture-proof airtight sheet 3 with an adhesive, and the wood fiber board is made of wood fibers obtained by defibrating wood chips. It is manufactured by pressing, and is obtained by artificially reconstructing natural wood,
Has stable quality and strength without variation,
By using such a wood fiber board as a part of the material constituting the floor substrate, it is possible to supply a floor substrate having a certain quality and strength at a relatively low cost and stably. In addition, wood fiber board is homogeneous, but has the disadvantage that it is easy to bend and the dimensional change rate due to moisture absorption and desorption is relatively large, but by using this laminated with plywood, the shape change and dimensional change can be reduced. And the floor base plate is hardly warped or changed in size as a whole.

Since the hard layer of the wood fiber board is hard as described above, it is excellent in the action of preventing termites from being damaged, and has a high specific gravity and a low hygroscopic property. It is an essential requirement of the present invention that the wood fiber board 2 be laminated on the back side of the plywood, that is, under the floor, and that the moisture-proof airtight sheet 3 be further laminated on the back side (under the floor) so as to be in contact with the hard layer. It has become.

The floor substrate thus constructed is applied to a structural material such as a joist such that the moisture-proof airtight sheet 3 is on the lower surface (under the floor) to obtain a floor substrate structure, and the floor material is placed on the floor substrate. Is to be constructed.

In the floor substrate having the above-described structure, moisture coming from under the floor is prevented from moving to the wood fiber board 2 and the plywood 1 by the moisture-proof airtight sheet 3 provided under the floor. Therefore, the propagation and proliferation of the decay fungi are prevented, thereby preventing the decay of the floor substrate.

Further, the moisture-proof airtight sheet 3 and the hard layer of the wood fiber board 2 provided under the floor physically prevent the ants from being damaged by termites. By preventing moisture from the surface, the wood fiber board 2 and the plywood 1 can be maintained in a low humidity state, and can prevent the damage caused by termites.

In FIG. 1, the moisture-proof airtight sheet 3 is made of a wood fiber board 2.
Is provided so as to cover the entire back surface of the plywood 1, but is provided so as to wrap around from the back surface of the wood fiber board 2 to the kiguchi (FIG. 2), and further wrap around to the kiguchi of the plywood 1 to cover. (FIG. 3) or may be provided so as to cover the entire surface of the floor substrate (FIG. 4). In the embodiment shown in FIGS. 2 to 4, the front and back sides of the sheet are also covered with the moisture-proof airtight sheet 3.

As the area covered by the moisture-proof airtight sheet 3 increases, the moisture absorption and desorption of the wood fiber board 2 and the plywood 1 are suppressed, and a floor substrate having good dimensional stability can be obtained. When the moisture-proof and airtight sheet 3 covers the opening of the wood fiber board 2 (FIG. 2) or further covers the opening of the plywood 1 (FIGS. 3 and 4), The effect of preventing erosion from the wood tip surface is obtained.

[0021]

According to the present invention, the moisture-proof and airtight sheet blocks moisture from under the floor and prevents the plywood and the wood fiberboard located thereon from becoming high in humidity. The change can be prevented, and the floor can be prevented from being uneven or wavy.

At the same time, the plywood and the wood fiber board are maintained at a low moisture content, so that the growth and proliferation of the decay fungi can be suppressed, the decay of the floor baseboard can be prevented, and the termites can be prevented from being damaged.

According to the present invention, the above-mentioned antiseptic effect and insect repellent effect are obtained by adopting a configuration in which a moisture-proof airtight sheet is provided under the floor and a hard layer of a wood fiber board is provided in contact with the moisture-proof airtight sheet. And there is no need to use agents such as preservatives and insect repellents. This means that preservative and insect repellent effects can be obtained without adversely affecting the human body as a side effect of these drugs.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating a configuration of a floor substrate according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically illustrating a configuration of a floor substrate according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view schematically showing a configuration of a floor substrate according to still another embodiment of the present invention.

FIG. 4 is a cross-sectional view schematically showing a configuration of a floor substrate according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plywood 2 Wood fiber board 3 Moisture-proof airtight sheet

Continued on front page F term (reference) 2B250 AA05 BA05 BA06 BA08 CA11 DA04 EA02 EA13 FA21 FA31 GA03 2E001 DB01 DH12 DH14 FA12 GA22 GA24 GA42 HB04 HC02 HC12 HD11 HD13 2E162 CB08 CC03 CC08 CD11 CD12 CD13

Claims (2)

[Claims] 1. A moisture-proof airtight sheet is disposed on the back surface of a plywood via a wood fiber board having a hard layer on at least one side, and the hard layer of the wood fiber board is in contact with the moisture-proof airtight sheet. Floor slab. 2. A moisture-proof airtight sheet is disposed on the back surface of the plywood via a wood fiber board having a hard layer on at least one side, and the hard layer of the wood fiber board is in contact with the moisture-proof airtight sheet. An underfloor structure in which an underfloor board is constructed on a structural material such that the moisture-proof and airtight sheet is located below the floor.