JP2003097037A - Sound insulating floor and floor bed panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound insulating floor capable of reducing the level of sounds caused by impacts on the floor, such as the level of sounds caused by heavy objects on the floor, without using glass wool, and a floor bed panel for use with the sound insulating floor. SOLUTION: A hollow bed panel 40 for use with the sound insulating floor 10 has cavities each having an approximately trapezoidal cross section and formed at regular intervals, and a plurality of openings leading to the cavities are formed on the slab 20 side face of the hollow bed panel. The openings are formed in predetermined positions such that they serve as resonant pipes for sounds caused by impacts on the floor, having wavelengths which each opening is designed to absorb. Inside the cavity, as a sound wave of the resonating frequency repeats oscillations, its energy is consumed by friction against interior wall surfaces and by viscosity among air particles at open ends, whereby the sound waves around that frequency can be absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation floor installed on a slab of a building such as an apartment house and a floor base panel used for the sound insulation floor.

[0002]

2. Description of the Related Art A dry sound-insulating double floor is generally used as a floor structure of an apartment building such as a condominium. In the conventional dry sound-insulating double floor, anti-vibration support legs are arranged at a predetermined interval on a slab that is a concrete floor, and each edge of the floor base panel made of particle board or plywood is bonded on the support board of the anti-vibration support legs. It is fixed and the flooring panel is finished with flooring and other finishing. This type of double floor has the advantage that the unevenness of the slab can be absorbed by the support legs, eliminating the need for the work of smoothing the slab surface, and the advantage that piping and wiring work in the underfloor space is easy. There is.

[0003]

By the way, in the double floor of this kind, when the floor vibrates due to the impact from the floor, the air under the floor is compressed to vibrate the slab and the impact sound is transmitted to the downstairs. Because of this, there was a measure to absorb sound by placing a porous sound absorbing material such as glass wool mat or rock wool mat on the slab.

However, since porous sound absorbing materials such as glass wool mats and rock wool mats have a large sound absorbing characteristic in a relatively high frequency range, a low frequency range of 125 Hz or less such as heavy floor impact sound generated by the splash of children. There was a problem that the sound of the sound could not be absorbed sufficiently and the shock sound was transmitted to the downstairs. Further, since it is necessary to lay a sound absorbing material such as a glass wool mat over the entire space under the floor, there is a problem that the work becomes complicated due to the relationship with the piping. Furthermore, since glass wool scatters harmful substances to some extent, sound insulation measures that do not use glass wool are desired.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to reduce the floor impact sound level without using a sound absorbing material such as glass wool, and also to reduce the heavy floor impact sound level. It is intended to provide a floor and a floor base panel used for this sound insulation floor.

[0006]

In order to solve the above problems, the present invention provides a sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, wherein the floor base panel is
A plurality of cavities extending in one direction are provided inside, and an opening connected to the cavities is provided on the surface on the support leg side so that the cavities serve as resonance tubes for sound waves containing a predetermined wavelength. It has a feature. According to this configuration, since the cavity of the floor base panel serves as a resonance tube for sound waves including a predetermined wavelength,
In the cavity, energy is consumed due to friction on the inner wall surface and viscous action between air particles at the opening end while the sound wave of the wavelength repeats vibration, and the sound wave centered on the wavelength can be absorbed.

Further, according to the present invention, in a sound-insulating floor having a floor structure in which a plurality of support legs support a floor base panel, a sound absorbing device is attached to a surface of the floor base panel on the side of the support legs. I am trying. According to this configuration,
The sound absorbing device can absorb the impact sound of the underfloor space.

Further, according to the present invention, in a sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, in the floor base panel, a surface on the side of the support leg is a support point supported by the support leg. It is characterized in that it protrudes in a region including positions that are substantially equidistant from. According to this configuration, even if the underfloor panel flexes and vibrates, the compressed air in the underfloor space can flow toward the surrounding supporting leg side due to the protruding portion of the surface of the underfloor panel on the supporting leg side. Vibration of space can be reduced.

Further, according to the present invention, in a sound-insulating floor having a floor structure in which a plurality of support legs support the floor base panel, the floor base panel has two points on the support leg side surface supported by the support legs. It is characterized in that it protrudes in a region including a position substantially equidistant from the support point of. According to this configuration, when the floor base panel flexurally vibrates, the compressed air in the underfloor space can flow toward the two support leg sides by the protruding portion of the support leg side surface of the floor base panel.

Further, in the present invention, in a sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, the floor base panel is a cavity penetrating the floor base panel, and the floor surface of the cavity. It is characterized in that the side surface has a cavity formed therein so as to project to a surface facing the cavity at a central position in the longitudinal direction of the cavity. According to this configuration, when the floor base panel flexurally vibrates, the compressed air in the cavity can be smoothly extracted from the side surface of the floor base panel by the protrusion formed on the floor side surface of the cavity of the floor base panel. Becomes

Further, according to the present invention, in a sound-insulating floor having a floor structure in which a plurality of support legs support a floor base panel, the floor base panel is disposed below the floor base panel and is generated in an underfloor space in response to vibration of the floor base panel. It is characterized by having a fluid resistance damping device for guiding the compressed air to the floor parallel direction.
With this configuration, the compressed air generated in the underfloor space according to the vibration of the floor base panel can be guided in the parallel direction to the floor surface by the fluid resistance damping device.

Further, the present invention is a floor base panel used for a sound insulating floor having a floor structure in which a plurality of support legs support the floor base panel, and has a plurality of cavities extending in one direction therein. The surface on the side of the supporting leg is characterized by having an opening connected to the cavity so that the cavity serves as a resonance tube for a sound wave having a predetermined wavelength.

Further, the present invention is a floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, wherein the support leg side surface has a sound absorbing device, The sound absorbing device has a plurality of cavities extending in one direction therein, and an opening connected to the cavities on the support leg side surface so that the cavities serve as resonance tubes for sound waves containing a predetermined wavelength. It is characterized by having.

Further, the present invention is a floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, and the surface on the side of the support legs is supported by the support legs. It is characterized in that it protrudes in a region including a position approximately equidistant from the supporting point.

The present invention also relates to a floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, the cavity being a cavity penetrating the floor base panel. The surface on the floor side has a cavity formed therein so as to project to a surface facing the central position in the longitudinal direction of the cavity.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment (1-1) Configuration of First Embodiment FIG. 1 is a diagram showing a sound insulation floor of a dry sound insulation double floor structure according to the first embodiment of the present invention. The sound insulation floor 10 includes a vibration isolation support leg 30 arranged at intervals on a slab 20 which is a building frame, a hollow base panel 40 supported by the vibration isolation support leg 30, and a hollow base panel 40. It is composed of a finishing material 50 placed on top. The finishing material 50 is a flooring material, a tatami mat, a carpet, or the like, and a disposing material may be arranged between the finishing material 50 and the hollow base panel 40, if necessary.

As shown in FIG. 2, the anti-vibration support leg 30 includes a support bolt 32 rotatably supported by a frustum-shaped anti-vibration rubber 31, and a support board 3 screwed to the support bolt 32.
3 and 3. A hexagonal hole 34 is formed on the upper end surface of the support bolt 32, and as shown in FIG.
The hollow base panel 40 has the hexagon socket 3 on the support board 32.
4 are placed at intervals so that they can be seen from above, and the height adjustment (leveling) of the hollow base panel 40 can be performed by rotating the support bolt 32 using a hexagon wrench through the hexagon hole 34. It is like this.
The hollow base panel 40 may be adhesively fixed to the support board 33, or screws or bolts may be used to support the support board 33.
It may be fixed to.

The hollow base panel 40 is a laminated thin wooden board made of laminated thin wooden pieces, and is in the longitudinal direction (parallel to the floor surface).
The cavities 41 having a substantially trapezoidal cross section are formed at regular intervals.
Here, as shown in an enlarged view of the side surface of the hollow base panel 40 in FIG. 3, the hollow base panel 40 has a slope of approximately 60 degrees and a slope of 120 degrees between the hollow base panels 40 adjacent to each other in the laminating direction of the wooden thin pieces.
It is formed so as to be laminated with the gradient of the degree (areas indicated by symbols α and β). For this reason, in the hollow base panel 40, the force applied in the direction perpendicular to the floor surface (Y direction) and the direction parallel to the floor surface (X direction) acts substantially in the compression direction with respect to the longitudinal direction of the thin wooden piece, and these directions are also applied. The strength against the force applied from is high. Therefore, although this hollow base panel 40 has a hollow structure and is lightened in weight, it can have high strength (rigidity) in the direction perpendicular to the floor surface and the direction parallel to the floor surface, and is generally used as a floor base panel. Compared to particle boards and plywood, the strength / weight ratio is improved.

Further, as shown in the side view of the hollow base panel 40 and the slab side surface (lower surface) in FIG. 4, the hollow base panel 40 has a plurality of openings 42 connected to the cavities 41 on the slab side surface. Are formed. These openings 42
Is for adjusting each of the cavities 41 to be a resonance tube for a floor impact sound having a wavelength to be absorbed. Details will be described in the sound absorption principle described below.

Next, the sound absorption principle of the hollow base panel 40 will be described with reference to FIG. FIG. 5 shows FIG.
FIG. 9 is a diagram showing a cross section taken along the line AA ′ of the bottom view shown in FIG. 4, showing a case where openings 42 are formed at positions of lengths L1 and L2 from the open ends of both ends of one cavity 41. As shown in the figure, the cavity 41 (open tube = tube whose both ends are open ends) in which the opening 42 is formed has a length (L1 + L) from the viewpoint of acoustics.
It can be regarded as the open tube α of 2), the open tube β of the length L2, and the open tube γ of the length L1. Therefore, each open tube α, β, γ
As shown in the figure, the standing wave of the open tube α has a wavelength λα = 2.
Resonating with the sound wave of × (L1 + L2), the open tube β has the wavelength λβ
= 2 × L2, and the open tube γ has a wavelength λγ = 2 ×
Resonating with the sound wave of L1, energy is consumed in the cavity 41 due to friction on the inner wall surface and viscous action between air particles at the opening end while the sound waves having these wavelengths λα, λβ, and λγ repeat vibration. However, the sound waves centering on the wavelengths λα, λβ, and λγ can be attenuated.

Further, from the opening 42 of the cavity 41, the wavelength λ
Since the sound waves of α, λβ, and λγ are re-emitted with a time delay, sound waves having a phase shifted with respect to the incident sound can be emitted to the underfloor space, which also causes the wavelengths λα, λβ, and λ.
The impact sound due to the sound wave of γ can be reduced. That is, the hollow base panel 40 can efficiently attenuate the sound waves centering on three kinds of wavelengths in one cavity 41, and can adjust the sound waves to be attenuated according to the position where the opening 42 is formed. It is like this.

Therefore, in order to absorb sound waves in the 250 Hz band, which is the performance determining frequency of the lightweight floor impact sound level, 0.68 m of any of the lengths L1, L2 and (L1 + L2) is used.
It should be done before and after (wavelength (2 x 0.68 m)
= Speed of sound (340 m / s) / frequency (250 Hz)). By the same calculation, in order to absorb the sound wave in the 125 Hz band, which is the performance determining frequency of the heavy floor impact sound level, the length L
Any one of 1, L2 and (L1 + L2) should be around 1.36 m. Further, in order to absorb the sound wave in the 63 Hz band which is the lowest performance determining frequency of the heavy floor impact sound level, any one of the lengths L1, L2 and (L1 + L2) may be set to about 2.70 m. Actually, the frequency of the sound wave that is absorbed (resonant) by the opening edge correction will be slightly shifted.

Accordingly, the hollow base panel 40 has a panel length (= the total length (L1 + L2) of the cavity 41) of 1.3.
If the height is about 6 m, the 125 Hz heavy floor impact sound is attenuated in all the cavities 41 provided with the openings 42, so that the heavy floor impact sound level transmitted downstairs can be significantly reduced. Therefore, if the length of the panel is 2.7 m and the position of the opening 42 is formed at the position of the length L1 = 1.36 m, the heavy floor impact sound level of 63 Hz and 125 Hz can be efficiently reduced. You can The lightweight floor impact sound level further has an opening 42 at a position where the length L1 or L2 is 1.36 m or less (for example, a position near 0.68 m).
By providing a plurality of openings 42 in one cavity 41, it is possible to further reduce the weight floor impact sound level while reducing the weight floor impact sound level.

As a result, the hollow base panel 40 is
As shown in FIG. 4, openings 42 are formed at different positions of the cavity 41.
It is possible to attenuate sound waves of various frequencies including a heavy floor impact sound of 250 Hz or less, which was hardly attenuated by glass wool. Also,
If the openings 42 are formed at the same positions of the respective cavities 41, the floor impact sound level of the sound wave having a specific frequency can be reduced, and at least the total length (L1 + L2) of the cavities 41 in which the openings 42 are formed is 1 or less. If it is set to 0.36 m or more, the heavy floor impact sound level can be significantly reduced.
Actually, in order to reduce the impact sound in the frequency band 20 to 300 Hz, the lengths L1, L2, etc. are 0.68 m to 2.7.
It is desirable to form the openings 42 to have various values in the range of m.

Therefore, according to this embodiment, the sound insulation floor 10 is provided.
This hollow base panel 40 not only prevents the floor impact sound from being transmitted to the downstairs without using the glass wool that emits harmful substances, but also sufficiently insulates the heavy floor impact sound that could hardly be insulated by the glass wool. can do. Moreover, when the floor surface is impacted, the sound insulation floor 10 has a plurality of cavities 41 of the hollow base panel 40.
As a result, the vibration is dispersed from the shock excitation point to the support point (the area supported by the support board), so that the vibration can be damped and the shock can be absorbed.

Further, as described above, the hollow base panel 40 used in the sound insulation floor 10 has a higher strength / strength than that of the particle board or plywood generally used as the floor base panel.
Since the weight ratio is improved, it is possible to make the size of the hollow base panel 40 larger than that of the conventional floor base board when the support weight of the anti-vibration support legs 30 is the same as the conventional weight. For this reason, the degree of freedom in designing the hollow base panel 40 is high, and by increasing the length and width of the hollow base panel 40, the arrangement interval of the vibration isolation support legs 30 can be increased and the number of vibration isolation support legs 30 used can be increased. It is also possible to reduce. If the number of anti-vibration support legs 30 used can be reduced, the height adjustment (leveling) work of the hollow base panel 40 can be simplified, and the material cost and work cost can be reduced.

Next, the manufacturing method and material of the hollow base panel 40 will be specifically described. In this hollow base panel 40, after the binder is attached to the wooden thin pieces, as shown in FIG. 6, the connecting plate 6 is formed on the first to several layers of the wooden thin pieces.
A core 60 made of trapezoidal aluminum rods connected at equal intervals of 0a is arranged, one to several layers of wood flakes are dispersed, and then made of trapezoidal aluminum rods connected at equal intervals by a connecting plate 60b. The child 60 is placed, and wood flakes are further sprayed. At this time, the core 60 connected by the connecting plate 60a
And the core 60 connected by the connecting plate 60b are arranged so that the trapezoids are turned upside down.

Next, the above laminated body 70 in which wooden thin pieces are laminated
At a temperature of 140 to 220 ° C. and a pressure of 15 to 40 kg / cm
² in heat and pressure molding 6-15 minutes, the thickness is 1 / 3-1 / 30
The hollow base panel 40 can be manufactured by forming the opening 42 after the core 60 is drawn out after being hot-pressed, the core 60 is pulled out after cooling, and the outer periphery of the laminate 70 is trimmed.

As the woody thin pieces, red pine, larch, ezo pine, todo pine, aspen, lodgepole pine, etc. are usually used, but the tree species is not particularly limited. In addition, the wood flakes may be arranged so that the grain directions are substantially aligned in one direction, or may be a three-layer structure and laminated so that the grain directions of adjacent layers are orthogonal to each other. It is not something that will be done. Further, a plurality of types of wood flakes may be mixed or the mixing ratio of the wood flakes and the binder may be changed according to the strength or rigidity of the target hollow base panel 40.

As the binder, any of a foamable binder resin, a non-foamable binder resin and a mixture thereof may be used, but the foamable binder resin is preferable. Since the foamable binder resin binds the wooden thin pieces to each other and foams itself, the amount of the resin component used is reduced by expanding the gap between the wooden thin pieces with the foaming cell, and the hollow base panel 40 is made low. It can be densified. Furthermore, the foam cells can improve the heat insulating effect and the sound insulating effect of the hollow base panel 40.

As the foamable binder resin, either a self-foaming foamable resin or a mixed foamable resin obtained by adding a foaming agent to a non-foaming resin such as phenol, urea, epoxy or acrylic may be used. For the purpose of improving rigidity and obtaining the hollow base panel 40 having a low density, it is preferable to use a foaming resin that self-foams. Examples of the self-foaming foaming resin include foaming polyurethane resin, isocyanate resin, and preferably PMDI (polymetallic MD).
I or crude MDI) and the like. When a foamable polyurethane resin or isocyanate resin is used, it easily reacts with water, and the isocyanate group (-NCO) reacts with water to self-foam, which shortens the reaction time and shortens the time required for thermocompression molding. can do.

The amount of the binder with respect to the wood flakes is preferably 3.5 to 20 parts by weight with respect to the wood flakes weight part (absolute dry weight). It is also possible to change the density and strength of the hollow base panel 40 by changing the addition amount of the binder. If necessary, a curing agent, a curing catalyst, a curing accelerator, a diluent, a thickener, a dispersant, a water repellent, or the like may be added to the binder.

Further, it is preferable that the wood thin piece is previously acetylated. In the case of acetylation, the wood flakes are dried to a water content of 3% or less, preferably 1% or less, and then contacted with vaporized vapor such as acetic acid, acetic anhydride or chloroacetic acid to acetylate (acetylate) in the gas phase. 12 to 20
%) Is preferable. By acetylating the wood flakes in this manner, water resistance can be obtained, and it is possible to prevent dimensional changes over time.

(1-2) Modification of First Embodiment The present invention is not limited to the above-described embodiment and can be implemented in various modes. For example, the following modifications are possible.

(Modification 1) In the above embodiment,
Although the case where both ends of the cavity 41 of the hollow base panel 40 are open ends has been described, one or both ends of the cavity 41 may be closed ends. For example, when one end of the cavity 41 is closed,
That is, when the cavity 41 is closed, from the viewpoint of acoustics, as shown in FIG. 7, a closed tube (= tube with open ends at both ends) α1 and an open tube with length L2, as shown in FIG. β1
Can be regarded as a closed tube γ1 having a length L1. Therefore, as shown in the figure, the standing waves of the open tubes α1, β1, and γ1 are that the closed tube α1 resonates with the sound wave of the wavelength λα1 = 4 × (L1 + L2), and the open tube β1 has the wavelength λβ1 = 2 × L2. And the open tube γ1 resonates with the sound wave of wavelength λγ1 = 4 × L1. As a result, the hollow base panel 40 can attenuate the sound waves having the wavelengths λα1, λβ1, and λγ1 as the center.

Therefore, when one end of the cavity 41 is closed, the performance determining frequency of the heavy floor impact sound level is 125.
In order to absorb the sound wave in the Hz band, for example, the total length (L1 + L2) of the cavity 41, that is, the length of the hollow base panel 40 is set to about 0.68 m, and when both ends of the cavity 41 are open ends. It is possible to absorb sound waves of the same frequency with a length half that of the comparison. In addition, in order to absorb the sound wave of 63 Hz which is the performance determining frequency of the lowest frequency of the heavy floor impact sound level, the length of the hollow base panel 40 may be set to 1.36 m. Further, when the length of the hollow base panel 40 is set to 1.8 m, which is the same as that of the conventional floor base boat, it becomes possible to absorb sound waves of 47 Hz or higher. The case where both ends of the cavity 41 are closed ends is the same as the case where both ends of the cavity 41 are open ends. In practice, the frequency band 20-30
In order to reduce the impact sound of 0 Hz, it is desirable to form the openings 42 so that the lengths L1, L2, etc. have various values in the range of 0.68 m to 2.7 m.

(Modification 2) In the above embodiment,
Although the openings 42 were not formed in all the cavities 41 of the hollow base panel 40 (see FIG. 4), the openings 4 were formed in all the cavities 41.
It goes without saying that 2 may be formed. The more cavities 41 in which the openings 42 are formed, the more the floor impact sound level can be reduced. Further, a porous material such as glass wool may be used as the sound absorbing material, and a wide band sound absorbing effect may be realized by a hybrid with tube resonance. Further, the back surface of the hollow base panel 40 may be constituted by a resonator (a perforated plate).

If the openings 42 are formed in the adjacent cavities 41, a part of the sound wave re-emitted from the openings 42 is incident on the openings 42 of the adjacent cavities 41 due to diffraction, and the adjacent cavities 41 are separated from each other. At this time, energy is consumed due to friction on the inner wall surface of the cavity 41 and viscous action between air particles at the opening end. It becomes possible to further absorb some of the sound waves.

(Modification 3) In the above embodiment,
The case where the floor impact sound is reduced by using the cavity 41 of the hollow base panel 40 as a resonator has been described. However, as shown in FIG. 8, the sound absorbing device 80 is attached to the slab side surface of the hollow base panel 40. Floor impact noise may be reduced. In this case, the hollow base panel 40
It is not necessary to form the opening 42, but the opening 42 may be formed.

Here, FIG. 9 is a view showing a concrete example of the sound absorbing device 80 attached to the hollow base panel 40. In this figure, a sound absorbing device 80-1 is a resonator utilizing the above-described sound absorbing principle, and a plurality of pipes 81 having openings 42 formed according to the wavelength of a sound wave to be absorbed are connected in a horizontal row. It is configured. Further, the sound absorbing device 80-2 is configured by connecting a plurality of pipes 82 whose length is determined according to the wavelength of the sound wave to be absorbed in a horizontal row. Further, the sound absorbing device 80-3 is the sound absorbing device 80-of the two types described above.
It is a sound absorbing device configured by combining 1 and 80-2. The pipes of these sound absorbing devices may be open pipes or closed pipes, and the pipes are not limited to the method of connecting them in a horizontal row. Further, the pipe may be either a rectangular pipe or a circular pipe.

(2) Second Embodiment (2-1) Configuration of Second Embodiment FIG. 10 is a diagram showing a sound insulation floor of a dry sound insulation double floor structure according to the second embodiment of the present invention. In this figure, the sound insulation floor is shown when the floor base panel 110 is viewed from the longitudinal direction. The sound insulation floor 100 is the same as the sound insulation floor 10 according to the first embodiment except that the floor base panel is different. Therefore, the same parts are designated by the same reference numerals and the description thereof will be omitted. Only 110 will be described.

As shown in the figure, the floor base panel 110.
Has the same shape as the conventional floor base board in that the upper surface is flat for mounting the finishing material 50, but the surface on the slab side (lower surface) is supported by the support board 33 when viewed in the longitudinal direction. The slab 2 is located approximately at the center of each support point.
It is formed so as to project toward the 0 side, have the smallest thickness at the peripheral portion 110B of the projecting portion 110A, and gradually become thicker toward the support point side. Here, as shown in FIG. 11 when a perspective view of the floor base panel 110 is seen from diagonally below, the projecting portions 110A have the same cross-sectional shape (cross-sectional shape shown in FIG. 11).
However, the shape may be a right-left symmetrical shape (indicated by reference numeral 110-1) or a bilaterally symmetrical shape (indicated by a reference numeral 110-2).

As described above, by providing the protruding portion 110A on the surface of the floor base panel 110 on the slab 20 side, as shown in FIG. 12, the floor base panel 110 flexurally vibrates and compresses the air in the underfloor space. Also, since the air is compressed in the direction shown by the arrow in the figure, as shown in FIG. 13, the compressed air in the underfloor space can flow toward both sides of the anti-vibration support legs 30 (parallel to the slab surface). Becomes As a result, compared with the case where the conventional slab surface is simply a flat surface, the compressed air component colliding with the slab 20 from the direction perpendicular to the slab can be significantly reduced, and the vibration of the slab can be reduced. . Therefore, the sound insulation floor 100 according to the present embodiment.
Can reduce the floor impact sound level transmitted downstairs through the slab 20 without using glass wool that emits harmful substances.

Further, the floor base panel 110 has an advantage that the bending rigidity is high since the thickness is increased at the protruding portion 110A. Further, in the present embodiment, the region supported by the support board 33 is also formed thick, so that the bending rigidity of the entire floor base panel 110 can be increased. For this reason, the amount of deflection due to the impact of the floor is reduced, and the case where the slab 20 is vibrated by the compressed air in the underfloor space can be reduced,
This also makes it possible to reduce the floor impact sound level transmitted downstairs to some extent.

(2-2) Modification of Second Embodiment The invention of the present application is not limited to the above-described embodiment and can be implemented in various modes. For example, the following modifications are possible.

(Modification 1) In the above-described embodiment, the floor base panel 110 is manufactured so as to be gradually thickened from the peripheral portion 110B of the protruding portion 110A toward the support point side. As shown, the floor base panel 110 having the same thickness except for the protrusion 110A may be used. In short, even if the floor base panel 110 is flexed and vibrated, the compressed air in the underfloor space can escape in the direction parallel to the slab surface if the protrusion 110A is provided, and the floor impact sound level transmitted downstairs can be reduced. Becomes Further, although the case where the protrusion 110A and the like of the floor base panel 110 are formed with a smooth curved surface has been described, the protrusion 110A and the like may be formed with a plurality of flat surfaces (slopes) as shown in FIG.

(Modification 2) In the above-described embodiment, the case where the present invention is applied to the floor base panel having no hollow structure has been described. However, the floor base having the hollow structure as described in the first embodiment is described. The protrusion 110 is provided on the surface of the panel on the slab 20 side.
Even if A is provided, the same effect can be obtained.

Further, when the present invention is applied to a floor base panel having a hollow structure, as shown in the sectional view of the hollow portion in FIG. 16, the inner surface of the member 110U on the floor side of the cavity is the center in the longitudinal direction of the cavity. The same effect can be obtained even if the protrusions 110A are provided so as to protrude on the surfaces facing each other at the position. In this case, since the compressed air in the cavity smoothly escapes from the side surface of the floor base panel 110 in response to the impact from the floor surface, the impact from the floor surface can be absorbed to some extent, and the lower side (slab side) across the cavity can be absorbed. It is possible to reduce the amount of deflection of the member 110D.

Further, as shown in FIG. 17, an opening 110C may be provided at a position facing the protrusion 110A in the lower member 110D with the cavity interposed therebetween. With this configuration, when the floor base panel 110 flexurally vibrates in response to an impact from the floor surface, the air inside the cavity of the floor base panel 110 can be more smoothly extracted from the side surface.

(Modification 3) Further, in the above-described embodiment,
Protrusion 11 provided on the slab 20 side of the floor base panel 110
The case where the compressed air in the underfloor space is allowed to escape in the direction parallel to the slab surface by 0A has been described, but the present invention is not limited to this, and as shown in FIG.
A fluid resistance damping device 120, which is a member having the same shape as 0A, is placed on the slab 20, and the fluid resistance damping device 120 allows compressed air in the underfloor space to escape in the direction parallel to the slab surface (= parallel to the floor surface) for damping. You may allow it. FIG. 19
As shown in the perspective view of the fluid resistance damping device 120,
The fluid resistance damping device 120 may have a bilaterally symmetrical shape (indicated by reference numeral 120-1 in FIG. 19) or may have the same cross-sectional shape (indicated by reference numeral 120-2 in FIG. 19). The surface of the fluid resistance damping device 120 is preferably a smooth surface or a surface having a predetermined surface roughness in order to smooth the flow.

The surface of the fluid resistance damping device 120 is not limited to a curved surface, and may be a flat surface as shown in FIG. Further, as shown in FIG. 21, the fluid resistance damping device 12
A guide 121 for letting the compressed air escape in the direction parallel to the slab surface may be further provided.

Further, the floor base panel 110 having the above-mentioned protruding portion 110A and the above-mentioned fluid resistance damping device 120.
It goes without saying that the compressed air in the underfloor space may be released in the direction parallel to the slab surface by using both of the above.

(Modification 4) In addition, the hollow base panel 40 described in the first embodiment is provided with the protrusion 1 described in the second embodiment.
10A may be provided. If you do this,
Further, it is possible to reduce the floor impact sound level. Similarly, the floor impact sound level can be further reduced by disposing the fluid resistance damping device 120 below the hollow base panel 40.

[0055]

As described above, according to the present invention, floor impact sound level such as heavy floor impact sound level can be reduced without using glass wool.

[Brief description of drawings]

FIG. 1 is a diagram showing a sound insulation floor of a dry sound insulation double floor structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a vibration-proof support leg.

FIG. 3 is a partially enlarged view of a hollow foundation panel used for a sound insulation floor.

FIG. 4 is a view showing a side view and a bottom view of a hollow base panel.

FIG. 5 is a diagram for explaining a sound absorption principle of a hollow base panel.

FIG. 6 is a diagram which is used for describing a method for manufacturing a hollow base panel.

FIG. 7 is a diagram for explaining a modified example of the hollow base panel.

FIG. 8 is a diagram for explaining a modified example in which a sound absorbing device is provided on a hollow base panel.

FIG. 9 is a diagram showing a specific example of a sound absorbing device provided on a hollow base panel.

FIG. 10 is a diagram showing a sound insulation floor of a dry sound insulation double floor structure according to a second embodiment of the present invention.

FIG. 11 is a perspective view of a floor base panel used for a sound insulation floor.

FIG. 12 is a diagram for explaining a sound absorption principle of a floor base panel.

FIG. 13 is a diagram for explaining a sound absorption principle of a floor base panel.

FIG. 14 is a diagram showing a modified example of a floor base panel.

FIG. 15 is a diagram showing a modified example of a floor base panel.

FIG. 16 is a diagram showing a modified example of a floor base panel.

FIG. 17 is a diagram showing a modified example of a floor base panel.

FIG. 18 is a diagram for explaining a sound pressure divider used for a sound insulation floor.

FIG. 19 is a perspective view of a fluid resistance damping device.

FIG. 20 is a diagram for explaining a modification of the fluid resistance damping device.

FIG. 21 is a diagram for explaining a modified example of the fluid resistance damping device.

[Explanation of symbols]

10 ... Sound insulation floor, 20 ... Slab, 30 ... Anti-vibration support leg, 31 ... Anti-vibration rubber, 32 ... Support bolt, 33 ... Support board, 40 ... Hollow base panel (floor base panel), 41 ... Cavity, 42 ... Opening, 50 ... Finishing material, 80, 80-1, 80-2, 80-3 ... Sound absorbing device, 110, 110-1, 110-2 ... Floor base panel, 110A ...... Projection part, 120, 120-1, 120-2 ...... Fluid resistance damping device, 121 ...... Guide.

Claims (16)

[Claims] 1. A sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, wherein the floor base panel has a plurality of cavities extending in one direction inside, and a surface on the support leg side. Is a sound insulation floor having an opening connected to the cavity so that the cavity serves as a resonance tube for a sound wave having a predetermined wavelength. 2. A sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, wherein the floor base panel has a sound absorbing device attached to a surface on the support leg side. . 3. The sound absorbing device has a plurality of cavities extending in one direction inside, and the cavities serve as resonance tubes for sound waves including a predetermined wavelength on a surface of the support leg side. The sound insulation floor according to claim 2, wherein the sound insulation floor has an opening connected to the cavity. 4. The length of the cavity is 1.36 m or more when both ends of the cavity are open ends, and is 0.68 m or more when only one end of the cavity is open ends. The sound insulation floor according to claim 1 or 3. 5. A sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, wherein a surface of the floor base panel on the side of the support leg is substantially equidistant from a support point supported by the support leg. A sound insulation floor characterized by being projected in a region including the position of. 6. A sound-insulating floor having a floor structure in which a plurality of support legs support a floor base panel, wherein the floor base panel has a surface on the side of the support leg from two support points supported by the support legs. A sound insulation floor characterized by being projected in a region including positions at substantially equal distances. 7. The thickness of the floor base panel is thinnest in the peripheral portion of the projecting region, and gradually increases from the peripheral portion toward the supporting point direction. The sound insulation floor according to 6. 8. A sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, wherein the floor base panel is a cavity penetrating the floor base panel, and a surface of the cavity on the floor surface side is A sound insulation floor having a cavity formed therein so as to project to a surface facing each other at a central position in the longitudinal direction of the cavity. 9. The floor base panel is formed at a position facing an opening, which is connected to the cavity, on the facing surface of the cavity, and a portion where a surface of the cavity on the floor surface side projects. The sound insulation floor according to claim 8, which has an opening. 10. A sound insulation floor having a floor structure in which a plurality of support legs support a floor base panel, wherein compressed air generated in an underfloor space is disposed below the floor base panel and is generated in response to vibration of the floor base panel. A sound insulation floor having a fluid resistance damping device for guiding in a direction parallel to the floor surface. 11. A floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, wherein a plurality of cavities extending in one direction are provided inside, and the support leg side is provided. An underfloor panel having an opening connected to the cavity so that the cavity serves as a resonance tube for sound waves having a predetermined wavelength. 12. A floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, wherein the surface of the support leg has a sound absorbing device, and the sound absorbing device comprises: A plurality of cavities extending in one direction are provided inside, and the support leg side surface has an opening connected to the cavities so that the cavities serve as resonance tubes for sound waves containing a predetermined wavelength. Characteristic floor base panel. 13. The length of the cavity is 1.36 m or more when both ends of the cavity are open ends, and is 0.68 m or more when only one end of the cavity is open ends. The floor base panel according to claim 11 or 12. 14. A floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, wherein the surface on the side of the support legs is from a support point supported by the support legs. An underfloor panel characterized by being projected in a region including positions at substantially equal distances. 15. A floor base panel used for a sound insulation floor having a floor structure in which a plurality of support legs support the floor base panel, the cavity being a cavity penetrating the floor base panel, and the floor surface side of the cavity. 1. The floor base panel, wherein the surface has a cavity formed so as to project to a surface facing the central position in the longitudinal direction of the cavity. 16. The floor base panel is formed at a position facing an opening, which is connected to the cavity, in the facing surface of the cavity, and which faces a portion where a floor-side surface of the cavity projects. The floor base panel according to claim 15, which has an opening.