JPS63308154A - Soundproof floor material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a flooring material that provides good livability for residences or offices, particularly apartment complexes, and has an excellent effect of reducing floor impact noise.

<Conventional technology> Conventionally, foamed plastic flooring called cushion flooring, carpets, and tatami mats have been generally installed on the floors of rooms such as living rooms and studies in apartment complexes, but the former lacks warmth; The latter is damp and has the risk of attracting dirt and dust mites, so for example, parquet plywood for oak flooring, decorative plywood for decorative plywood such as cherry wood with beautiful grain, etc.
Alternatively, there is a tendency to use synthetic wood flooring with an excellent wood feel. In addition, it can be used in high-traffic areas such as meeting halls, offices, and school auditoriums, where parquet plywood or even surface hardness is required in place of vinyl tile sheets in terms of the high-class feel and abrasion resistance of wood. Ceramic tiles, resin-filled concrete decorative tiles, etc. are also used in some cases.

<Problems to be solved by the invention> However, when the parquet plywood etc. mentioned above is used as a flooring material, it tends to generate tapping noise, that is, impact noise, and impact noise from above floors is a particular problem in apartment complexes. For example, there are construction methods such as laying high-density glass wool as a sound absorbing material under the flooring material, but these are not effective in reducing impact noise and are cumbersome to install. Furthermore, flooring materials such as magnetic tiles and resin-containing concrete decorative tiles produce a loud tapping sound from the heels of shoes when walking or jumping, and there is a need to reduce this.

<Means for Solving the Problems> The present inventors have repeatedly investigated various acoustic materials and combination structures thereof as a method for reducing impact noise on the floor, and have arrived at the present invention.

The soundproof flooring material according to the present invention has wood board materials laminated on both sides of a viscoelastic body having a shear modulus of elasticity of 105 to 108 dyn/cm2 at 100Hz, and metal filaments or synthetic or natural fibers intertwined on the lower surface of the laminate. A three-dimensional network structure is pasted thereon, and at least one of the upper and lower surfaces of each wooden board is made with 10 to 10 incisions in the thickness direction to a depth of 10 to 75% of the board thickness. 500++n
This feature is characterized in that they are provided at intervals of .

The present invention will be explained based on the drawings. FIG. 1 is a cross-sectional view of one embodiment, in which a wood board (1) is stacked on the top surface of a viscoelastic body (3), a wood board (1) is stacked on the bottom surface, and a wood board (1) is stacked on the bottom surface of the viscoelastic body (3).
) has a notch (2) cut from the viscoelastic body side. Three-dimensional network structure (4) on the lower wooden board (l')
It is constructed by pasting.

Furthermore, as shown in FIG. 2, a decorative surface material (5) may be attached to the upper wooden board (1), and as shown in FIG. A woven fabric or non-woven fabric (6) is stretched between the 3-dimensional network structure (4) and a woven fabric or non-woven fabric (6') is stretched on the lower surface of the 3-dimensional network structure (4) as shown in FIG. It may also be configured by

The wood-based boards (1) and (1') may be, for example, single-layer board 5 plywood, or may be wood-based fiberboard such as particle board. Also, the plate thickness is the density of the cuts to be made.

It is determined based on the depth, the rigidity of the composite plate with the viscoelastic body (3) inserted therein, and the impact sound attenuation characteristics.

Usually about 2-15IIIl, preferably 4-1oI
? A material of about 100 liters is used. Thickness is 219III
If the thickness is less than 15 mm, the rigidity of the floor will generally be insufficient, although it depends on the rigidity of the other board and the effect of the cut.On the other hand, if the thickness is 15 mm or more, this will also be Although it depends on the characteristics of the inserted viscoelastic body, it is generally difficult for the viscoelastic body to exert its damping effect, which in turn makes it difficult to achieve the effect of reducing floor impact noise, which is undesirable. .

Further, the materials of the upper plate material and the lower plate material may be the same or a combination of different materials, and may be determined depending on the use and purpose.

In addition to the examples shown in Figures 1 to 4, the cuts to be made in the wooden boards may be made from one side of one board as shown in Figure 5, from one side of the other board as shown in Figure 6, or from one side of the other board depending on the purpose. From one side of one board and from both sides of the other board, or from the seventh
They may be provided from both sides of the upper and lower plates as shown in the figure.

The depth of the cut is in the range of 10 to 75%, preferably 25 to 50%, of the thickness of the wood plywood. If the depth of cut is less than 10%, the effects described below will not occur, and if the depth of cut is more than 75%,
Although it depends on the thickness of the wood-based board, in general, if the load is too high, the strength will be reduced due to the notch effect, which is not desirable in terms of physical properties as a floor.

The cuts may be made in either the vertical or horizontal direction of the surface of the wood board, or may be in the form of a cross-cutting grid, or may be in the form of intermittent straight lines, broken lines, or curves, and the spacing between the cuts is 10 to 500 W++. . If it is less than 10W, depending on the depth of the cut, the cut density is too high, resulting in a decrease in strength, which is undesirable.If it is more than 500 mm, the cut effect described below will hardly be exhibited.The arrangement of the cuts is equally spaced.

Any irregular intervals may be used.

The width of the cut is about 0.5 to 5 mm, and if it is 5 mm or more, the soundproofing effect as a flooring material decreases. Further, the cross-sectional shape of the cut may be any of a concave shape, a U-shape, a ■-shape, etc.

The effect of this cut is to move or disperse the resonance of the wood-based board material, thereby reducing the floor impact sound level due to resonance. In other words, in general, the light impact sound of a wooden floor installed on a concrete slab often has a peak at frequencies of 125Hz and 250Hz when frequency analysis is performed in the octate band. By lowering or partially changing the apparent stiffness of this board material, the resonance frequency is moved or dispersed, and the floor impact sound level at 125Hz and 250) 1z is reduced.

The viscoelastic body (3) must have a shear modulus of 105 to 108 dyn/C1112 at 10011z. In other words, in order to expect an impact sound attenuation effect as a soundproof flooring material, it is necessary that the loss coefficient of the wooden flooring material be 0.05 or more. Elastic modulus 105~108dyn/c
It is necessary to keep the tan of the viscoelastic material within the range of
The larger δ is, the more preferable it is, but it is suitable if tan δ>0.5. Roughly, by setting the shear modulus at a frequency of 100 Hz to the above range of 105 to 10 [1 dyn/cm2, floor impact noise is particularly problematic, 6311 z~
Soundproofing measures can be effectively obtained in the low frequency range of 250 Hz.

The thickness of such a viscoelastic body is 0.25 to 3.0!11
111, preferably having a stiffness of 0.5 to 1.5 mm. If the thickness is less than 0.25+wn+, the loss coefficient of the composite wood board material will not be effectively expressed, and therefore floor impact sound cannot be effectively attenuated. Also, the thickness is 3.
If it exceeds 0 mm, it is not desirable as a flooring material because it is a viscoelastic material and may flow from the joints under high temperatures such as direct sunlight in the summer or when a large load is applied to the floor. .

Materials for such viscoelastic bodies include butyl rubber A and SB.
Synthetic rubbers such as R and NBR and synthetic resins such as polyvinyl chloride are used, and various oils, plasticizers, fillers, etc. are blended to adjust the elastic modulus, jan δ, etc. to meet the purpose, and the material is made into a sheet. The formed one is used.

In addition, adhesives are usually used to clamp and fix this viscoelastic body in front of the wood board, but if the viscoelastic body itself has self-adhesive properties that do not change over time. , it is not necessarily necessary to use adhesive.

The three-dimensional network structure (4) used in the present invention is a three-dimensional network structure made by three-dimensionally entangling relatively rigid synthetic resin filaments or equally rigid natural fiber filaments. , 70 N/ca+2・c at room temperature using a non-resonant 2 forced-imaging dynamic stiffness tester.
A structure exhibiting a value of m or less is preferable, and the lower this value is, the better, because if this value exceeds 7ON/cn+2·Cl11, the impact sound mitigation effect will not be sufficient.

Examples of the material of the three-dimensional network structure satisfying 70 N/cag2/c+++ of the present invention include nylons such as nylon 6 and nylon 66, polypropylene, rigid and semi-rigid polyvinyl chloride, polyacetal, and polyester resin filaments. . Filaments made of low-density polyethylene, ethylene/vinyl acetate copolymer, ABS resin, rubber-modified polystyrene, etc. lack "stiffness", so only three-dimensional network structures consisting of a certain range are included.

Additionally, a certain range of natural fibers such as rock wool and par 11 can be utilized as the three-dimensional network structure within the numerical values of the present invention. However, when natural, highly rigid fibers are used in housing complexes, there is a risk of insufficient ventilation, which may encourage the growth of dust mites, or a decrease in strength due to strong alkaline moisture. It is preferable to take measures such as resin impregnation treatment beforehand. Metal filaments have a similar effect, but iron filaments are prone to rust, and aluminum and bronze yield to impact stress and static loads and lose their elasticity, so stainless steel 5. It is preferable to use rust-free copper steel with a large spring constant.

These three-dimensional network structures are formed into a rough mat shape by intertwining filaments as described above, and have a large porosity and appropriate elasticity, and are highly effective in absorbing vibration energy, and are also similar to concrete. Slab waving (Frik)
It also has the effect of absorbing. The thickness of the filament varies depending on the material, but the structure is 70 N/cn+
”・In order to have physical property values of 01m or less, it is usually 0.2 to 3.
A diameter of IIIllφ is used. If it is thinner than this, no matter how dense the net structure is, it will be deformed by load or impact and no soundproofing effect will be achieved, and if the diameter is 3 mm or more, it will be too rigid and will not exhibit the behavior of mitigating impact noise. The thickness of this three-dimensional network structure is 3 to 20 mm at room temperature and under no load (in the atmosphere).
This range is preferred. : Below 3wa+, the effect of reducing impact noise such as tapping is poor, and even if it is above 20I1W, the effect of reducing impact noise does not increase to that extent, which increases cost and increases the amount of floor sinking when a load is applied. This is because problems such as

In addition, as mentioned above, this three-dimensional network structure has non-woven fabric or woven fabric laminated on one or both sides of the structure to improve adhesion to wooden boards or floor slabs or to reinforce the three-dimensional network structure itself. Can be used.

Furthermore, as shown in FIGS. 2 to 7, a decorative surface material (5) may be attached to the surface of this soundproof flooring material to make it a more practical or decorative flooring material.

Such decorative surface material (5) is selected from parquet plywood, hegi board, plywood decorative plywood, various veneer boards, synthetic wood, ceramic tiles, etc., and is usually made of a hard material with a thickness of about 0.2 to 5 m. is preferably used.

Note that the soundproof flooring material according to the present invention may be a structure formed by laminating these constituent materials in advance, and on-site,
A structure formed by laminating these constituent materials may be sufficient.

<Effects of the Invention> The soundproof flooring material according to the present invention obtained in this manner is particularly suitable for use in concrete and ALC flooring materials, and is suitable for use with glass wool and rock, which have been conventionally used as floor impact noise prevention structures. Compared to wet floating floor structures such as wool and dry floating floor structures such as rubber blocks and rubber bats, the construction period is shorter and the three-dimensional network structure can absorb undulations on the concrete surface, which is difficult to do in the past, as well as in the high frequency range. It has features such as being able to effectively reduce the floor impact sound level over a wide frequency range, including the low frequency range that was previously considered to be the lowest frequency range.

<Example> The present invention will be described in more detail with reference to Examples below.

Example 1 A viscoelastic body made of a butyl rubber sheet with a thickness of 1ff11, a plywood with a thickness of 3IIIl and JAS standard grade 1 on the lower surface, and a plywood with a thickness of 5.2a + * on the upper surface and a depth of 2 on the side facing the viscoelastic body.
The loss coefficient of a 0-piece laminated material made by laminating JAS Standard 1 grade plywood with adhesive lamination, which has U-shaped notches of mm in a lattice pattern in the longitudinal direction at equal intervals of f50++-, is calculated from the resonance half-width value of mechanical impedance. It was found to be 0.25. Furthermore, the dynamic spring constant value of nylon filament on the bottom surface of this laminated material (the plywood surface without notches) is 65N/n+"
A soundproofing structure according to the present invention as shown in the cross-sectional view of FIG. Formed the flooring.

Next, No. 8 simulated a concrete apartment complex.
With the structure shown in the cross-sectional view of the figure, 2680n+mX 35
A two-story box-shaped concrete room with a floor area of 80++nw was prepared, and the soundproof flooring material according to the present invention was laid without complaint on the upper surface of the 150mm+ thick concrete floor on the upper floor. A microphone was installed at a height of 1200 mm above the first floor floor surface, and the impact sound from the tapping machine from above the floor was measured in accordance with JIS A 141B (method for measuring floor impact sound levels at building sites).

The measurement results are shown in Table 2.

Example 2 In Example 1, butyl rubber sea!・Thickness of 3ml
+, the thickness of the plywood laminated on the upper surface side of the butyl rubber sheet is 811I-, the notch depth is 4 mm, and the present invention has the same structure except that the notches are provided only in the vertical direction at equal intervals of 100III11. A soundproof flooring material according to the above was formed, and as in Example 1, the impact sound caused by a tapping machine from above the floor was measured based on JIS A 1418.

The measurement results are shown in Table 2.

Comparative Example 1 The same three-dimensional network structure as in Example 1 was laminated on the lower surface of plywood of JAS standard grade 1 with a thickness of 8IIl-, and a decorative surface material made of the same plywood as in Example 1 was laminated on the upper surface. When the loss coefficient of the plywood part of the 0-piece flooring material was calculated, it was found to be 0.
．． It was 01.

As with Example 1, JIS A 141 was also applied to this flooring material.
Impact sound was measured using a tapping machine based on 8.

The results are shown in Table 2.

Comparative Example 2 In Comparative Example 1, a thickness of 8 mm was used instead of the three-dimensional network structure.
The flooring material was constructed using a natural rubber sheet with a JI5 hardness of 8o.

As with Example 1, this flooring material also complies with JIS A 141.
Impact sound was measured using a tapping machine based on B.

The results are shown in Table 2.

Comparative Example 3 Impact sound was measured using a tapping machine based on JIS A 1418 in the case of only a concrete floor (thickness 150 mm).

The results are shown in Table 2.

Comparative Example 4 In Example 1, the depth of the notch provided in the plywood was increased to 4
．． A flooring material was formed in the same manner except that the thickness was 5 mm (86.5% of the board thickness). When this flooring material was laid on the upper surface of a concrete floor as shown in Fig. 8 and walked on by a person weighing approximately 60 kg, many cracks appeared in the notched plywood after a few minutes, making it unusable.

For comparison, the same walking test was conducted on the soundproof flooring materials formed in Examples 1 and 2, but no cracks were found.

Table 1 shows a summary of the constituent materials of the Examples and Comparative Examples and their thicknesses.

In addition, Table 2 shows the measurement results of each impact sound of Examples and Comparative Examples.

As shown in Table 2 below, in Comparative Example 3 with bare slab only, the sound insulation grade according to the Architectural Institute of Japan standards is L-85, whereas in Comparative Example 2, the sound insulation grade is L-70, and In Comparative Example 1 using a three-dimensional network structure, the sound insulation grade was L-
However, the sound insulation grade of both Examples 1 and 2 of the flooring materials according to the present invention is significantly improved to L-55.

[Brief explanation of the drawing]

1 to 7 are partial cross-sectional views of examples of soundproof flooring materials according to the present invention, and FIG. 8 is a vertical cross-sectional view of a room in which a floor impact sound test was conducted. (1), (1')... Wooden board, (2)... Notch, (3)... Viscoelastic body, (4)... Three-dimensional network structure, (5)... Decorative surface material. (6), (6')...Woven fabric or nonwoven fabric.

Claims (1)

[Claims] 1. Shear modulus is 10^5 to 10 at 100Hz
It is made by laminating wood-based boards on both sides of a viscoelastic body of ^8 dyn/cm^2, and pasting a three-dimensional network structure formed by intertwining metal filaments or synthetic or natural fibers on the bottom surface of the laminate. , 10 to 75% of the board thickness in the thickness direction on at least one of the upper and lower surfaces of each of the wood board materials.
% deep cuts are provided at intervals of 10 to 500 mm.