JP4636075B2 - Sound insulation floor and floor base panel - Google Patents

Description

  The present invention relates to a sound insulating floor installed on a slab of a building such as an apartment house and a floor foundation panel used for the sound insulating floor.

  As a floor structure of an apartment building such as a condominium, a dry sound insulation double floor is generally used. In conventional dry sound insulation double floors, anti-vibration support legs are arranged on a concrete floor slab at predetermined intervals, and each edge of the floor base panel made of particle board or plywood is bonded to the support board of the anti-vibration support legs. The flooring panel is fixed and finished with flooring. This type of double floor has the advantage that the unevenness of the slab can be absorbed by the support legs, eliminating the need to smooth the slab surface, and the piping and wiring work in the underfloor space being easy. Yes.

  By the way, in this type of double floor, if the floor vibrates due to an impact from the floor, the air under the floor is compressed, causing the slab to vibrate and transmitting the impact sound to the downstairs. A porous sound absorbing material such as glass wool mat or rock wool mat was laid to take measures against sound absorption.

  However, porous sound-absorbing materials such as glass wool mats and rock wool mats have a large sound-absorbing characteristic in a relatively high range. Could not absorb enough sound, and there was a problem that the impact sound was transmitted downstairs. Moreover, since it was necessary to lay a sound absorbing material such as glass wool mat over the entire space under the floor, there was also a problem that the work was complicated due to 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-described circumstances, and can provide a sound insulation floor that can reduce a floor impact sound level without using a sound absorbing material such as glass wool, and can also reduce a heavy floor impact sound level. It aims at providing the floor foundation panel used for a sound insulation floor.

In order to solve the above-described problems, the present invention provides a sound insulation floor having a floor structure in which a floor foundation panel is supported by a plurality of support legs, wherein the floor foundation panel is a cavity that penetrates the floor foundation panel, inner surface of the floor surface side, in a central position in the longitudinal direction of the cavity, is characterized by having formed a cavity so as to protrude within side facing the inner surface inside.
According to this configuration, when the floor foundation panel is flexed and vibrated, the compressed air in the cavity can be smoothly extracted from the side surface of the floor foundation panel by the protrusion formed on the floor side surface of the cavity of the floor foundation panel. It becomes.

Further, the present invention is a floor foundation panel used for a sound insulation floor having a floor structure that supports a floor foundation panel by a plurality of support legs, and is a cavity that penetrates the floor foundation panel, and the floor surface of the cavity inner surface of the side is in the central position in the longitudinal direction of the cavity, it is characterized by having formed a cavity so as to protrude within side facing the inner surface inside.

  According to the present invention, a floor impact sound level such as a heavy floor impact sound level can be reduced without using glass wool.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) 1st Embodiment (1-1) Structure of 1st Embodiment FIG. 1: is a figure which shows the sound insulation floor of the dry type sound insulation double floor structure which concerns on 1st Embodiment of this invention. The sound insulation floor 10 includes an anti-vibration support leg 30 that is disposed on the slab 20 that is a building frame with a space, a hollow base panel 40 that is supported by the anti-vibration support leg 30, and a hollow base panel 40. It is comprised from the finishing material 50 mounted on top. The finishing material 50 is a flooring material, a tatami mat, a carpet, and the like, and a scraping material may be disposed between the finishing material 50 and the hollow base panel 40 as necessary.

  As shown in FIG. 2, the anti-vibration support leg 30 includes a support bolt 32 that is rotatably supported by a frustum-shaped anti-vibration rubber 31, and a support board 33 that is screwed to the support bolt 32. Yes. A hexagonal hole 34 is formed in the upper end surface of the support bolt 32. As shown in FIG. 1, the hollow base panel 40 is spaced on the support board 33 so that the hexagonal hole 34 is viewed from above. The height of the hollow base panel 40 (leveling) can be adjusted by rotating the support bolt 32 using a hexagon wrench through the hexagonal hole 34. The hollow base panel 40 may be bonded and fixed to the support board 33, or may be fixed to the support board 33 using screws or bolts.

  The hollow base panel 40 is a wood flake assembly plate in which wood flakes are laminated, and cavities 41 having a substantially trapezoidal cross section are formed at regular intervals in the longitudinal direction (parallel to the floor surface). Here, as shown in the enlarged view of the side surface of the hollow base panel 40 in FIG. 3, the hollow base panel 40 has an inclination of about 60 degrees and 120 degrees between the cavities 41 adjacent to each other in the stacking direction of the wood flakes. They are formed so as to be laminated at an inclination (regions indicated by symbols α and β). For this reason, in this hollow base panel 40, the force applied in the floor surface vertical direction (Y direction) and the floor surface parallel direction (X direction) acts in a substantially compressing direction with respect to the longitudinal direction of the wood flakes. The strength against the force applied from is increased. Therefore, although the hollow base panel 40 is reduced in weight by having a hollow structure, it can increase the 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 board and plywood, the strength / weight ratio is improved.

  Further, as shown in FIG. 4 which is a side view of the hollow base panel 40 and a surface (lower surface) on the slab side, the hollow base panel 40 has a plurality of openings 42 connected to the cavities 41 on the slab side surface. ing. These openings 42 are for adjusting each cavity 41 to be a resonance tube for 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 is a diagram showing a cross section AA ′ of the bottom view shown in FIG. 4, and shows a case where openings 42 are formed at positions of lengths L 1 and L 2 from the opening ends of both ends of one cavity 41. ing. As shown in the figure, the cavity 41 in which the opening 42 is formed (open tube = a tube having both ends open) is an open tube α having a length (L1 + L2) and a length L2 from the viewpoint of acoustics. It can be regarded as an open tube β and an open tube γ of length L1. For this reason, as shown in the figure for the standing wave of each open tube α, β, γ, the open tube α resonates with a sound wave having a wavelength λα = 2 × (L1 + L2), and the open tube β has a wavelength λβ = The open tube γ resonates with the sound wave of 2 × L2 and resonates with the sound wave of wavelength λγ = 2 × L1, and inside the cavity 41, the sound wave of these wavelengths λα, λβ, and λγ repeats while repeating vibration. Energy is consumed by friction on the wall surface and viscous action between air particles at the opening end, and sound waves centered at wavelengths λα, λβ, and λγ can be attenuated.

  Furthermore, since the sound waves having the wavelengths λα, λβ, and λγ are re-radiated from the opening 42 of the cavity 41 with a time delay, the sound waves that are out of phase with the incident sound can be radiated to the underfloor space. Can also reduce the impact sound caused by the sound waves having the wavelengths λα, λβ, and λγ. That is, the hollow base panel 40 can efficiently attenuate sound waves centered on three types of wavelengths in one cavity 41 and can adjust sound waves attenuated according to the position where the opening 42 is formed. It is like that.

  For this reason, in order to absorb sound waves in the 250 Hz band, which is the performance determining frequency of the lightweight floor impact sound level, one of the lengths L1, L2, and (L1 + L2) may be set to around 0.68 m (wavelength (2 × 0.68 m) = Sonic velocity (340 m / sec) / frequency (250 Hz)). According to 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, one of the lengths L1, L2, and (L1 + L2) may be set to around 1.36 m. . Also, in order to absorb sound waves in the 63 Hz band, which is the lowest frequency performance determination frequency of the heavy floor impact sound level, one of the lengths L1, L2, and (L1 + L2) may be set to around 2.70 m. Actually, the frequency of the sound wave absorbed (resonated) by the opening end correction is slightly shifted.

  Therefore, if the length of the panel (= total length of the cavity 41 (L1 + L2)) is about 1.36 m, the hollow base panel 40 has a heavy floor impact sound of 125 Hz in all the cavities 41 provided with the openings 42. Is attenuated, the heavy floor impact sound level transmitted downstairs can be greatly reduced. For this reason, if the length of the panel is set to 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. Can do. The light floor impact sound level can be obtained by further providing openings 42 at positions where the length L1 or L2 is 1.36 m or less (for example, positions near 0.68 m). If 42 is provided, it is possible to further reduce the light floor impact sound level while reducing the heavy floor impact sound level.

  As a result, as shown in FIG. 4, the hollow base panel 40 forms various openings including a heavy floor impact sound of 250 Hz or less, which is hardly attenuated by glass wool, by forming openings 42 at different positions of the cavity 41. It is possible to attenuate sound waves of frequency. Further, if the openings 42 are formed at the same positions of the 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. If 1.36 m or more, the heavy floor impact sound level can be greatly reduced. Actually, in order to reduce the impact sound in the frequency band of 20 to 300 Hz, the opening 42 is formed so that the lengths L1, L2, etc. have various values in the range of 0.68 m to 2.7 m. Is desirable.

  Therefore, according to the present embodiment, the sound insulation floor 10 can not only prevent the floor impact sound from being transmitted downstairs without using the glass wool that emits harmful substances by the hollow base panel 40, but the sound insulation is almost impossible with the glass wool. The heavy floor impact sound that could not be achieved can be sufficiently insulated. In addition, when the sound insulation floor 10 receives an impact on the floor surface, the sound insulation floor 10 vibrates between the impact excitation point and the support point (the region supported by the support board 33) by the plurality of cavities 41 of the hollow base panel 40. Is dispersed, vibration can be attenuated and shock can be absorbed.

  Further, as described above, since the hollow base panel 40 used for the sound insulating floor 10 has an improved strength / weight ratio compared to a particle board or plywood generally used as a floor base panel, the vibration-proof support leg 30 is used. In the case where the supporting weight is the same as that of the conventional, the size of the hollow base panel 40 can be made larger than that of the conventional floor base board. For this reason, the design freedom of the hollow foundation panel 40 is high, and by increasing the length and width dimensions of the hollow foundation panel 40, the arrangement interval of the vibration isolation support legs 30 is widened to reduce the number of use of the vibration isolation support legs 30. It can also be reduced. If the number of use of the anti-vibration support legs 30 can be reduced, the height adjustment (leveling) operation of the hollow base panel 40 can be simplified, so that the material cost and the operation cost can be reduced.

  Next, the manufacturing method and material of the hollow base panel 40 will be specifically described. This hollow base panel 40 is made of a trapezoidal upper aluminum bar, which is attached to a wood flake after a binder is attached, and is connected to the first to several layers of the wood flake at equal intervals by a connecting plate 60a as shown in FIG. After placing the core 60 made of and disperse one to several layers of wood flakes, the core 60 made of trapezoidal aluminum rods connected at equal intervals by the connecting plate 60b is placed, and the 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 trapezoid is upside down.

  Next, the laminated body 70 in which the wood flakes are laminated is hot-pressed at a temperature of 140 to 220 ° C. and a pressure of 15 to 40 kg / cm 2 for 6 to 15 minutes, and hot pressed until the thickness becomes 1/3 to 1/30. The hollow base panel 40 described above can be manufactured by forming the opening 42 after the molding 60 is cooled and the core 60 is pulled out and then the outer periphery of the laminate 70 is trimmed.

  In addition, as the wood flakes, red pine, larch, spruce, todomatsu, aspen, lodgepole pine and the like are usually used, but the tree species is not particularly limited. Further, the wood flakes may be arranged so that the grain direction is substantially aligned in one direction, or a three-layer structure may be laminated so that the grain directions of adjacent layers are perpendicular to each other. Is not to 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.

  Moreover, as a binder, any of a foamable binder resin, a non-foamable binder resin, and a mixture thereof may be used, but a foamable binder resin is preferable. The foamable binder resin bonds the wood flakes to each other and foams itself. Therefore, the gap between the wood flakes is expanded by the foamed cells, thereby reducing the amount of resin used and reducing the hollow base panel 40. Densification can be achieved. Further, the heat insulating effect and the sound insulating effect of the hollow base panel 40 can be improved by the foam cell.

  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-foamable resin such as phenol, urea, epoxy, or acrylic may be used. For the purpose of obtaining a low-density hollow base panel 40, it is preferable to use a foaming resin that self-foams. Examples of the foaming resin that self-foams include foaming polyurethane resins and isocyanate resins, preferably PMDI (polymetallic MDI or crude MDI). When foamable polyurethane resin or isocyanate resin is used, it becomes easier to react with moisture, and the isocyanate group (-NCO) reacts with water and self-foams, so the reaction time is increased and the time required for hot pressing is shortened. 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 by weight (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. In addition, you may add a hardening | curing agent, a hardening catalyst, a hardening accelerator, a diluent, a thickener, a dispersing agent, a water repellent, etc. to a binder as needed.

  The wood flakes are preferably acetylated in advance. In the case of acetylation, the wood flakes are dried to a moisture content of 3% or less, preferably 1% or less, and then contacted with vaporized vapor such as acetic acid, acetic anhydride, chloroacetic acid or the like in the gas phase (acetylation). Degree of 12-20%). Thus, water resistance is obtained by acetylating the wood flakes, and it is possible to prevent aging of the dimensions.

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

(Modification 1)
In the above embodiment, the case where both ends of the cavity 41 of the hollow base panel 40 are open ends has been described, but one end or both ends of the cavity 41 may be closed. 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 α1 having a length (L1 + L2) and a length It can be regarded as an open tube β1 of L2 and a closed tube γ1 of length L1. For this reason, as shown in the figure, the stationary waves of the closed tube α1, the open tube β1, and the closed tube γ1 resonate with the sound wave having the wavelength λα1 = 4 × (L1 + L2), and the open tube β1 has the wavelength λβ1 = 2 ×. The closed tube γ1 resonates with the sound wave having the wavelength λγ1 = 4 × L1. As a result, the hollow base panel 40 can attenuate the sound waves having the wavelengths λα1, λβ1, and λγ1.

  Therefore, when one end of the cavity 41 is closed, in order to absorb the sound wave in the 125 Hz band that is the performance determining frequency of the heavy floor impact sound level, for example, the total length (L1 + L2) of the cavity 41, that is, the hollow base panel The length of 40 may be about 0.68 m, and sound waves having the same frequency can be absorbed with a half length compared to the case where both ends of the cavity 41 are open ends. In order to absorb the sound wave of 63 Hz, which is the lowest frequency determination frequency of the heavy floor impact sound level, the length of the hollow base panel 40 may be 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 is possible to absorb a sound wave of 47 Hz or more. Note that 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. Actually, in order to reduce the impact sound in the frequency band of 20 to 300 Hz, the opening 42 is formed so that the lengths L1, L2, etc. have various values in the range of 0.68 m to 2.7 m. Is desirable.

(Modification 2)
In the above-described embodiment, the openings 42 are not formed in all the cavities 41 of the hollow base panel 40 (see FIG. 4), but it goes without saying that the openings 42 may be formed in all the cavities 41. The more the 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 broadband sound absorbing effect may be realized by hybrid with tube resonance. Moreover, you may comprise the back surface of the hollow base panel 40 with a resonator (perforated plate).

  Further, if the opening 42 is formed in the adjacent cavity 41, a part of the sound wave re-radiated from the opening 42 is incident on the opening 42 of the adjacent cavity 41 by diffraction and coupled between the adjacent cavities 41. Vibration is generated and energy is exchanged. During this coupled vibration, energy is consumed due to friction on the inner wall surface of the cavity 41 and viscous action between air particles at the open end. It becomes possible to further absorb the sound.

(Modification 3)
In the above-described 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. A sound absorbing device 80 may be attached to reduce the floor impact sound. In this case, the hollow base panel 40 does not need to form the opening 42, but may form the opening 42.

  Here, FIG. 9 is a diagram illustrating a specific 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 using the above-mentioned sound absorption principle, and a plurality of pipes 81 having openings 42 formed in accordance with the wavelength of the sound wave to be absorbed are connected in a horizontal row. It is configured. The sound absorbing device 80-2 is configured by connecting a plurality of pipes 82 whose lengths are determined according to the wavelength of the sound wave to be absorbed in a horizontal row. The sound absorbing device 80-3 is a sound absorbing device configured by combining the two types of sound absorbing devices 80-1 and 80-2. Note that the pipes of these sound absorbing devices may be either open pipes or closed pipes, and the pipes are not limited to a method of connecting them in a horizontal row. The pipe may be either a square pipe or a circular pipe.

(2) Second Embodiment (2-1) Configuration of Second Embodiment FIG. 10 is a diagram showing a sound insulation floor having a dry sound insulation double floor structure according to a second embodiment of the present invention. In this figure, the sound insulation floor is shown when the floor foundation 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 foundation panel is different. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted. Only 110 will be described.

  As shown in the figure, the floor foundation panel 110 has the same shape as the conventional floor foundation board in that the upper surface is flat for placing the finishing material 50, but the slab side surface (lower surface) is long. When viewed from the direction, a substantially central region that is equidistant from each support point supported by the support board 33 protrudes toward the slab 20, and the thickness is the thinnest at the peripheral portion 110 </ b> B of the protrusion 110 </ b> A toward the support point. It is formed to become gradually thicker. Here, as shown in FIG. 11, a perspective view of the floor foundation panel 110 as viewed obliquely from below may have the same cross-sectional shape (the cross-sectional shape shown in FIG. 11) (indicated by reference numeral 110-1). Also, a symmetrical shape may be used (indicated by reference numeral 110-2).

  Thus, by providing the protrusion 110A on the surface of the floor foundation panel 110 on the slab 20 side, even if the floor foundation panel 110 is flexibly vibrated and compresses the air in the underfloor space as shown in FIG. Since the air is compressed in the direction indicated by the arrow in the figure, as shown in FIG. 13, the compressed air in the underfloor space can flow toward the anti-vibration support legs 30 on both sides (slab surface parallel direction). Thereby, compared with the case where the conventional slab surface is only a plane, the compressed air component which collides with the slab 20 from a right angle direction can be significantly reduced, and the vibration of the slab 20 can be reduced. Become. Therefore, the sound insulation floor 100 according to the present embodiment can reduce the floor impact sound level transmitted downstairs via the slab 20 without using glass wool that emits harmful substances.

  Further, the floor foundation panel 110 has an advantage that the bending rigidity is high because the thickness is increased at the protruding portion 110A. Furthermore, in this embodiment, since the area | region supported by the support board 33 is also formed thickly, the bending rigidity of the whole floor | floor basement panel 110 can be made high. For this reason, the amount of deflection due to the impact of the floor is reduced, the case where the slab 20 is vibrated by the compressed air in the underfloor space can be reduced, and the floor impact sound level transmitted downstairs can also be reduced to some extent. .

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

(Modification 1)
In the above-described embodiment, the case where the floor base panel 110 is manufactured so as to gradually increase in thickness from the peripheral portion 110B of the protruding portion 110A toward the support point side has been described. However, as shown in FIG. May use the floor base panel 110 having the same thickness. In short, even if the floor foundation panel 110 is flexibly vibrated, if there is a protrusion 110A, the compressed air in the underfloor space can be released in the direction parallel to the slab surface, and the floor impact sound level transmitted downstairs can be reduced. It becomes. Moreover, although the case where the protrusions 110A and the like of the floor foundation panel 110 are formed with smooth curved surfaces has been described, the protrusions 110A and the like may be manufactured with a plurality of planes (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 panel having the hollow structure as described in the first embodiment has a surface on the slab 20 side. Even if the protruding portion 110A 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 a sectional view of the hollow portion in FIG. 16, the inner surface of the member 110U on the floor side of the cavity is opposed at the center position in the longitudinal direction of the cavity. Even if the projecting portion 110A is provided so as to project on the surface to be performed, the same effect can be obtained. In this case, the compressed air in the cavity smoothly escapes from the side surface of the floor foundation panel 110 according to the impact from the floor surface, so that the impact from the floor surface can be absorbed to some extent, and the lower side (slab side) across the cavity. It becomes possible to reduce the amount of deflection of member 110D.

  Furthermore, as shown in FIG. 17, an opening 110 </ b> C may be provided at a position facing the protrusion 110 </ b> A in the lower member 110 </ b> D across the cavity. In this way, when the floor foundation panel 110 is flexibly vibrated in response to an impact from the floor surface, the air inside the cavity of the floor foundation panel 110 can be more smoothly extracted from the side surface.

(Modification 3)
In the above-described embodiment, the case where the compressed air in the underfloor space is released in the direction parallel to the slab surface by the protruding portion 110A provided on the slab 20 side of the floor foundation panel 110 has been described. Not limited to this, as shown in FIG. 18, a fluid resistance attenuating device 120 that is a member having the same shape as the protrusion 110 </ b> A described above is placed on the slab 20, and the fluid resistance attenuating device 120 slabs compressed air in the underfloor space. You may make it escape in the surface parallel direction (= floor surface parallel direction) and attenuate | dampen. As shown in a perspective view of the fluid resistance attenuating device 120 in FIG. 19, the fluid resistance attenuating device 120 may have a bilaterally symmetric shape (indicated by reference numeral 120-1 in FIG. 19), but has the same cross-sectional shape (indicated by reference numeral in FIG. 19). 120-2). The surface of the fluid resistance attenuator 120 is preferably a smooth surface or a surface having a predetermined surface roughness in order to make the flow smooth.

  Further, the surface of the fluid resistance attenuating 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, a guide 121 for allowing compressed air to escape in a direction parallel to the slab surface may be further provided as the fluid resistance attenuating device 120.

  In addition, it goes without saying that the compressed air in the underfloor space may be allowed to escape in the direction parallel to the slab surface by using both the floor base panel 110 having the protrusion 110A described above and the fluid resistance attenuation device 120 described above.

(Modification 4)
In addition, the hollow base panel 40 described in the first embodiment may be provided with the protruding portion 110A described in the second embodiment. In this way, the floor impact sound level can be further reduced. Similarly, the floor impact sound level can be further reduced by disposing the fluid resistance attenuating device 120 below the hollow base panel 40.

It is a figure which shows the sound insulation floor of the dry type sound insulation double floor structure which concerns on 1st Embodiment of this invention. It is a perspective view of an anti-vibration support leg. It is the elements on larger scale of the hollow base panel used for a sound insulation floor. It is a figure which shows the side view and bottom view of a hollow base panel. It is a figure where it uses for description of the sound absorption principle of a hollow base panel. It is a figure where it uses for description of the manufacturing method of a hollow base panel. It is a figure where it uses for description of the modification of a hollow base panel. It is a figure where it uses for description of the modification in the case of providing a sound absorption apparatus in a hollow base panel. It is a figure which shows the specific example of the sound-absorbing device provided in a hollow base panel. It is a figure which shows the sound insulation floor of the dry type sound insulation double floor structure which concerns on 2nd Embodiment of this invention. It is a perspective view of the floor foundation panel used for a sound insulation floor. It is a figure where it uses for description of the sound absorption principle of a floor foundation panel. It is a figure where it uses for description of the sound absorption principle of a floor foundation panel. It is a figure which shows the modification of a floor foundation panel. It is a figure which shows the modification of a floor foundation panel. It is a figure which shows the modification of a floor foundation panel. It is a figure which shows the modification of a floor foundation panel. It is a figure with which it uses for description of the sound pressure dividing device used for a sound insulation floor. It is a perspective view of a fluid resistance damping device. It is a figure where it uses for description of the modification of a fluid resistance damping device. It is a figure where it uses for description of the modification of a 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 ... Finish, 80, 80-1, 80-2, 80-3 ... Sound absorbing device, 110, 110-1, 110-2 ... Floor base panel, 110A ... Projection, 120, 120-1, 120-2 ... Fluid resistance damping device, 121 ... Guide.

Claims (4)

In the sound insulation floor of the floor structure that supports the floor base panel by a plurality of support legs,
The floor foundation panel is
A cavity penetrating the subfloor panel, the inner surface of the floor surface side of the cavity, in a central position in the longitudinal direction of the cavity, which is formed so as to protrude within side facing the inner surface of cavity A sound insulation floor characterized by having an inside. The floor foundation panel is
Within side to the opposite of said cavity is an opening leading to the cavity, and having an opening inner surface of the floor surface side of the cavity is formed at a position facing the portion protruding The sound insulating floor according to claim 1. A floor foundation panel used for a sound insulation floor having a floor structure that supports a floor foundation panel by a plurality of support legs,
A cavity penetrating the subfloor panel, the inner surface of the floor surface side of the cavity, in a central position in the longitudinal direction of the cavity, which is formed so as to protrude within side facing the inner surface of cavity An underfloor panel characterized by having an inside. The floor foundation panel is
Within side to the opposite of said cavity is an opening leading to the cavity, and having an opening inner surface of the floor surface side of the cavity is formed at a position facing the portion protruding The floor foundation panel according to claim 3.

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