JPH11270121A - Direct sticking woody sound-proofing floor material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the U-shaped upward warping of a direct sticking, sound- proofing floor material. SOLUTION: A direct sticking sound-proofing floor material is provided with cut grooves on the rear surface of woody base material on which a cushioning material is stuck. A sheet of a large tensional strength is stuck on the rear surface of woody base material in the direction intersecting to the cut grooves. The sheet covers 1/10 to 1/3 of the total length of the cut grooves. Thus, while keeping a sound proofing performance of a floor material, the U-shaped upward warping being the defect thereof can be solved by a simple and inexpensive method. Further, the effect what a material is to be used and how to stick it can be confirmed by a very simple experiment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wooden sound-insulating flooring material used for interiors of buildings such as houses and offices.

[0002]

2. Description of the Related Art Directly sound-absorbing wooden flooring material used for concrete houses, offices, etc. (hereinafter also simply referred to as flooring material).
Is made of wood chipboard, fiberboard, etc., such as plywood, veneer laminate (LVL), particle board, wafer board, etc .; The mainstream is a material in which a material is attached, a kerf is formed on the back surface of the base material, and a cushioning material such as a foamed polyethylene sheet is attached thereon.

[0003] Since these base materials are all wood materials, they expand and contract under the influence of changes in ambient humidity. In other words, when the surrounding humidity increases, it absorbs moisture and expands, and when the surrounding humidity decreases, releases moisture and contracts.

The sound-insulating flooring material directly attached to wood is applied directly to the surface of the concrete slab or to the surface of a separately prepared base material. Therefore, since the front surface is directly exposed to the surrounding environment, it easily absorbs and releases moisture according to the change in the surrounding humidity, but the back surface is in direct contact with the concrete slab or the base material, so that the surrounding environment is not exposed. Less susceptible to humidity changes.

[0005] For example, when the room is heated in winter, the surface is liable to release moisture and shrink, but since the moisture hardly escapes from the back surface, the dimensional change is difficult. For this reason, the flooring is likely to warp into a U-shape.

As a countermeasure against such a warpage, it is assumed that the floor material is warped into a U-shape after the construction and at the time of construction.
A method has been devised in which a difference is provided in the moisture content of the front and back surfaces so that the material is easily warped in advance, or a composite board combining a material with a small expansion rate and a large material is used as a floor substrate. .

[0007]

However, when the floor material is manufactured by the former method, the water content value must be kept within an extremely narrow range, which makes the operation difficult and increases the cost. . In addition, the produced flooring material was warped into a U-shape before the sticking work, so that there were drawbacks such as making the work difficult, and it was not satisfactory.

[0008] The same drawbacks are found in the flooring material produced by the latter method, which is not satisfactory.

[0009]

The present invention has solved the above problems by the following method. Less than,
This will be described with reference to the drawings. FIG. 1 is an explanatory view of a back surface and a vertical cross section of a base material of a wood-based sound-insulating floor material according to the present invention, and FIG. FIG. In the figure, A is a wooden sound-insulating floor material directly attached, and B is a cut groove provided on the back surface of the base material. The kerfs are necessary to make the floor material conform to the uneven surface of the concrete slab. It is engraved so as to be orthogonal to.

[0010] C is a cushioning material, which is affixed to the back surface of the floor base material for the purpose of sound insulation and to improve walking feeling so that human walking sounds are not transmitted downstairs. S is a sheet having a small thickness and a large tensile strength, and is attached so as to intersect the cut groove B as shown in FIGS. Since the kerfs are usually provided in a direction orthogonal to the longitudinal direction of the flooring material, the sheet is usually stuck substantially parallel to the longitudinal direction of the flooring material, but it is not necessarily required to be parallel.

As shown in FIG. 2, the sheet is affixed to the entire back surface of the floor base material so as to have a substantially uniform area so as not to be biased to a part of the back surface of the floor material. That is, the wide one is 1
In the middle of the book, two narrow ones are attached at an appropriate interval. Further, the sheet is affixed so as to cover 1/10 to 1/3 of the total length of the cut groove provided on the back surface of the flooring material.

As described above, the cut grooves on the back surface of the floor material are provided for the purpose of adapting the floor material to the uneven surface of the concrete slab and for improving the sound insulation performance of the floor material. If too much is applied, not only does it become difficult to conform to the uneven surface of the concrete slab during construction, but also the soundproofing performance decreases. The above coverage is 1 /
Although it can be set to less than 10, in this case, since the restraint against the warpage is very local, the floor material is likely to be distorted.

As described above, if a sheet having high tensile strength is pasted on the back surface of the flooring material, for example, the flooring material surface shrinks due to the drying of the flooring material surface, and the flooring material will warp in a U-shape. When the internal stress occurs,
Although a tensile stress acts on the sheet, the sheet having a high tensile strength restrains the sheet, so that warpage can be prevented.

[0014] The binding force of the sheet to the flooring material is determined by a number of conditions such as the thickness and width of the sheet, the tensile modulus of the material constituting the sheet, and the like. In addition, the effect of preventing warpage when the sheet is stuck on the back of the flooring material depends on how the sheet is stuck on the back surface of the flooring material.
It also depends on the bending strength of the floor material to which the sheet is to be applied.

Since the combination of these conditions rises to an almost infinite number, it is almost impossible to carry out an experiment on each of these and determine what kind of sheet and how to apply the sheet. . However, for example, if the sheet specifications such as sheet material, width, thickness, etc. are specified and the sheet is stuck in parallel with the longitudinal direction of the floor material having a width of 70 mm, does the U-shaped upward warpage preventive effect occur? If it is verified by a specific example, it can be easily performed by the method described below.

That is, the effect of preventing the warpage due to the binding force of the sheet is due to the prevention of the warpage of the floor material against the tensile stress generated on the back surface of the floor material. A fixed length, for example, the both ends of the floor material cut to a length of 350 to 450 mm is spanned over a span of 300 mm between fulcrums, a load of a certain value is applied to the center of the span, and the numerical value of the amount of bending deflection is obtained. Within a certain range, the flooring material can be said to exhibit the effects of the present invention. On the contrary, when the numerical value of the amount of bending deflection is larger than the above range, it can be understood that the effect of the binding force of the sheet is low.

The method shown in FIG. 3 is described in more detail and concretely. The floor material used is a substrate having a thickness of 9 mm and a width of 70 mm.
A plywood having a thickness of 900 mm and a length of 900 mm is used, and a wooden decorative veneer having a thickness of 0.3 mm is attached to the surface of the base material. On the back surface, 20 cut grooves having a width of 1 mm are formed at substantially equal intervals in parallel with the width direction, and further, a cushioning material having a thickness of 5 mm is adhered on the entire back surface.

The width between the wooden base material and the cushioning material is 18 m.
A tape made of plastic having a thickness of m, a thickness of 0.025 mm, and a length of 850 mm and reinforced with glass fiber is stuck in the longitudinal direction of the floor material. 350-450 length of the floor material
mm, and cut both ends in the longitudinal direction to a distance between fulcrums of 3 mm.
First, the bending amount h1 of the center point under a state where a load of 30 g per 10 mm of the floor width, that is, 210 g is applied to the center point of the span is measured on the center point of the span. Next, in addition to the above 210g, at the center point, a floor width of 10 g
A load of 30 g per mm, that is, 210 g, is applied, and the amount of deflection h2 at the center point is measured.

The above floor material manufactured by changing the tape width in various ways is applied to the surface of a concrete slab at a simulated construction site made to resemble an actual construction site, and the indoor humidity is reduced from 10% to 90%. As a result of the change, it was found that the value of the difference h2−h1 in the amount of bending was 2 mm or less for a U-shaped warp that would not hinder practical use.

In the above experiment, the width, span,
Although the load and the like are set as described above, the above method is only an example of an experiment, and it goes without saying that the width, span, size of the load, and the like of the floor material can be freely set. If the load per 10 mm of span length and floor width is changed, naturally, the numerical value of the difference in the amount of flexure that produces the effect of the present invention also changes. Obviously, it is necessary to confirm whether or not there is an effect of preventing warpage.

Since the U-shaped upward warpage is mainly caused by the tensile stress generated on the back surface of the flooring material, the length, width, span length and load value of the flooring material to be subjected to the experiment are used for the above experiment. If it is set to the same value as above, the U-shaped warpage is practically acceptable, even if the material of the sheet is changed to another material, or the width, thickness, or method of attaching the sheet is changed, and the experiment is performed. It is also theoretically clear that the value of the difference h2-h1 in the amount of deflection is 2 mm or less, which is almost the same as the above experimental value.

In the above experiment, the initial load can be set to zero, but it is preferable to set the load to 10 to 30 g per 10 mm of the floor width. That is, the relationship between the load and the deflection is substantially proportional to a certain range of load, but when the load is close to zero, the proportional relationship deviates greatly from the proportional relationship, and an abnormal value may be obtained.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A sheet used in the present invention is capable of restraining the back surface of a floor material from being stretched against tensile stress generated on the back surface of the floor material due to a change in humidity of an environment where the floor material is placed. Must be. As described above, the cause of the expansion of the flooring material is mainly the change in the humidity of the environment where the flooring material is placed. desirable.

For example, when the floor substrate is plywood, using a sheet that expands and contracts more with respect to changes in humidity than plywood has a small binding force, so the sheet must be thickened or widened. This is because not only is it wasteful, but as described above, if the width of the sheet is widened, the soundproofing performance is reduced. However, it is not always the case that a material that expands and contracts with respect to humidity change than plywood can be used for the following reasons.

In the case of a floor material provided with a cut groove on the back surface, if the cut groove is too deep, the rigidity of the floor is excessively reduced, and handling is hindered. If the kerf is too shallow, the effect of the kerf is reduced, so that the depth of the kerf is usually 1/3 to 3/5 of the thickness of the floor substrate.

Therefore, when an internal stress is generated to warp the flooring material into a U-shape, the stress is concentrated on the kerf portion which is the opening, and the width of the kerf is increased. And The coefficient of expansion in this kerf portion is much larger than the coefficient of expansion in other portions of the floor substrate. Therefore, even if the expansion coefficient is almost the same as or slightly larger than that of the floor substrate, it often has a sufficient binding force.

Accordingly, in the present invention, a paper tape made of a wood fiber can be used as long as the tensile strength is sufficient, but in general, a tape having a large elastic modulus has a large binding force. It is preferable to use a tape having a large tensile strength and a high tensile elasticity coefficient, such as a plastic tape reinforced with.

The sheet may be attached between the wood base material and the cushioning material, or may be attached from above the cushioning material. Therefore, it is more preferable to stick between the wooden base material and the cushioning material because the binding force is reduced. Therefore,
In relation to interposing the sheet between the wood base material and the cushioning material,
The thickness of the sheet is preferably as thin as possible.

[0029]

According to the present invention, a U-shaped warpage, which is a drawback of the U-shaped warp, is provided by providing a cut groove on the back surface of a wooden base material and maintaining the soundproofing performance of a sound-absorbing flooring material directly bonded with a wooden material, which is provided with a cushioning material. Was solved by a simple and inexpensive method. Also, it can be confirmed by a very simple experiment about what kind of material and how to apply the material.

[Brief description of the drawings]

FIG. 1 is an explanatory view and a longitudinal sectional explanatory view of a back surface of a base material of a wood-based sound-insulating flooring material according to the present invention.

FIG. 2 is an explanatory view of a back surface of a wooden base material of a directly-attached soundproof flooring material according to the present invention.

FIG. 3 is an explanatory view of an experimental method according to the present invention.

[Explanation of symbols]

 A Acoustic flooring material directly attached to wood B Cut grooves C Buffer material S Sheet h1 Deflection h2 Deflection

Claims (2)

[Claims] 1. A wood-based sound-insulating flooring material in which a decorative material is stuck on the surface of a wooden base material, a cut groove is provided on a back surface, and a cushioning material is stuck on the cut groove. A sheet is stuck between the back surface of the wooden base material and the cushioning material so as to cover 1/10 to 1/3 of the total length of the kerfs provided on the back surface of the base material, Cut to 350-450mm,
When both ends are spanned over a span having a distance of fulcrum of 300 mm, and a load of 30 g per 10 mm of floor width is applied to the center of the span, the amount of deflection at the center of the span is defined as (h1).
A sound-insulating flooring material directly attached to wood, wherein the amount of deflection at the center of the span when a load of 30 g per 0 mm is added is (h2), and the value obtained by subtracting (h1) from (h2) is 2 mm or less. 2. A wood-based sound-insulating flooring material in which a decorative material is stuck on a front surface of a wooden base material, a cut groove is provided on a back surface, and a cushioning material is stuck from above the cut groove, A sheet is stuck so as to cover 1/10 to 1/3 of the total length of the kerf from the top of the cushioning material.
Cut to 50mm, span both ends over a span of 300mm distance between fulcrums, and 3
The amount of deflection at the center of the span when a load of 0 g is applied is (h
1), and the amount of deflection at the center of the span when a load of 30 g is added per 10 mm of floor width is defined as (h2).
2) A sound-insulating flooring directly attached to wood, wherein a value obtained by subtracting (h1) from 2) is 2 mm or less.