JPH08199782A - Soundproofing double floor - Google Patents
Soundproofing double floorInfo
- Publication number
- JPH08199782A JPH08199782A JP1150795A JP1150795A JPH08199782A JP H08199782 A JPH08199782 A JP H08199782A JP 1150795 A JP1150795 A JP 1150795A JP 1150795 A JP1150795 A JP 1150795A JP H08199782 A JPH08199782 A JP H08199782A
- Authority
- JP
- Japan
- Prior art keywords
- floor
- sound
- sound absorbing
- floor base
- base material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims abstract description 60
- 239000011358 absorbing material Substances 0.000 claims description 24
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002250 absorbent Substances 0.000 abstract 4
- 230000002745 absorbent Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 11
- 229920001971 elastomer Polymers 0.000 description 10
- 239000006260 foam Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Landscapes
- Building Environments (AREA)
- Floor Finish (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、二重床に関するもの
であり、主に防音性能を向上させる技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double floor, and mainly to a technique for improving soundproof performance.
【０００２】[0002]
【従来の技術】近年、二重床は、集合住宅等において床
下配管ができ、施工性がよいことから急速に普及してき
た。この二重床は床基材の下面複数箇所より支持脚を突
設して構成された床材の支持脚をコンクリートスラブ等
の床下地上に載置することで複数隣合うように敷設され
るものであり、支持脚の下端に設けられた防振ゴムなど
によって床衝撃に対する防音性を確保するようにしてい
る。2. Description of the Related Art In recent years, double floors have rapidly become popular because they can be installed under the floor in apartments and the like and have good workability. This double floor is laid so that a plurality of support legs of the floor material, which are formed by projecting support legs from a plurality of lower surfaces of the floor base material, are placed next to each other by placing the support legs of the floor material on a floor base such as a concrete slab. Therefore, the vibration-proof rubber or the like provided at the lower ends of the support legs ensures soundproofness against floor impact.
【０００３】[0003]
【発明が解決しようとする課題】ところで、二重床に関
して、飛びはねや歩行、物の落下などに起因する衝撃音
の伝搬経路は、床基材の振動が支持脚を介して床下地へ
伝わる固体伝搬経路と、床基材からの放射音が床基材と
床下地との間の空気層を音波として伝わる空気伝搬経路
が考えられる。従来、床衝撃音に関する防音性能を向上
させるために、支持脚に防振ゴムを配設した構造がとら
れているが、防音性能を高めるために防振ゴムの弾性を
小さくしても低音域では性能があまり改善されない上
に、床全体の剛性が低下し、耐荷重性が悪くなったり、
歩行感が低下する問題があった。By the way, regarding the double floor, the propagation path of the impact sound caused by the splashing, walking, dropping of an object, etc. is the vibration of the floor base material to the floor base material via the supporting legs. A solid propagation path that propagates and an air propagation path that radiated sound from the floor substrate propagates as an acoustic wave in an air layer between the floor substrate and the floor substrate can be considered. Conventionally, in order to improve the soundproof performance related to floor impact sound, a structure in which antivibration rubber is arranged on the support legs has been taken, but in order to improve the soundproof performance, even if the elasticity of the antivibration rubber is made low In addition to not improving the performance so much, the rigidity of the entire floor decreases, the load bearing becomes worse,
There was a problem that the feeling of walking was reduced.
【０００４】本発明は、上記事由に鑑みてなしたもの
で、低音域においても防音性能が高い二重床を提供しよ
うとするものである。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a double floor having a high soundproofing performance even in a low sound range.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決する請求
項１記載の発明は、床基材１と当該床基材１を床下地４
上に支持する支持脚２で構成される二重床において、多
孔質吸音材５と、当該多孔質吸音材５の少なくとも床基
材１に対応する面に設けられた音波の入射により振動す
る材料１０からなる吸音構造体３を、床下地４上に配設
したことを特徴とする防音二重床である。The invention according to claim 1 for solving the above-mentioned problems is a floor base material 1 and a floor base material 4 for the floor base material 1.
In a double floor composed of support legs 2 supported above, a porous sound absorbing material 5 and a material provided on at least a surface of the porous sound absorbing material 5 that corresponds to the floor base material 1 and vibrates by incidence of a sound wave. A soundproof double floor in which a sound absorbing structure 3 composed of 10 is arranged on a floor base 4.
【０００６】請求項２記載の発明は、請求項１記載の発
明において、音波の入射により振動する材料１０とし
て、板状あるいは膜状の質量体を用いたことを特徴とす
る防音二重床である。According to a second aspect of the present invention, there is provided a soundproof double floor according to the first aspect of the invention, characterized in that a plate-shaped or film-shaped mass body is used as the material 10 that vibrates when a sound wave is incident. is there.
【０００７】請求項３記載の発明は、請求項１記載の発
明において、音波の入射により振動する材料１０とし
て、質量体の少なくとも対向する二辺に当該質量体より
剛性の小さいエッジ２０を設けた振動構造体を用いたこ
とを特徴とする防音二重床である。According to a third aspect of the present invention, in the first aspect of the invention, as the material 10 that vibrates when a sound wave is incident, edges 20 having a rigidity lower than that of the mass body are provided on at least two opposite sides of the mass body. A soundproof double floor using a vibrating structure.
【０００８】ここで、音波の入射により振動する材料１
０としては、例えば木板、鉄板、アルミ板、鉛板、アク
リル板、木毛セメント板、石膏ボード、ロックウールボ
ードなどの板状材料や、紙、アルミニュウムなどによる
ハニカムコア材、塩化ビニル、ゴム、ポリエチレン、紙
などの膜状材料、または、質量成分として硫酸バリウム
など各種粉体を充填した膜状材料などを用いることがで
きる。また、多孔質吸音材５としては１．０×１０5 Ｐ
ａ以下のヤング率を有するものが望ましく、無機繊維、
合成樹脂繊維、天然繊維、再生繊維などの繊維状多孔質
吸音材、またはポリエチレンフォーム、ポリウレタンフ
ォーム、ＰＶＣフォームなどの発泡体状多孔質吸音材な
どを用いることができる。無機繊維としては、ロックフ
ァイバー、ガラス、アルミナ、炭化珪素、スチールなど
の繊維、合成樹脂繊維としては、ポリエステル、ナイロ
ン、ポリアクリロニトリル、ポリプロピレン、ポリエチ
レン、ポリ塩化ビニルなどの繊維、天然繊維としては、
木質ファイバー、木綿、麻、竹、リンター、絹、羊毛な
どの繊維、再生繊維としてはレーヨンなどの繊維が挙げ
られる。Here, the material 1 that vibrates when a sound wave enters
Examples of 0 are plate-shaped materials such as wood board, iron board, aluminum board, lead board, acrylic board, wood wool cement board, gypsum board and rock wool board, paper, honeycomb core material such as aluminum, vinyl chloride, rubber, A film material such as polyethylene or paper, or a film material filled with various powders such as barium sulfate as a mass component can be used. Further, as the porous sound absorbing material 5, 1.0 × 10 5 P
Those having a Young's modulus of a or less are desirable, inorganic fibers,
A fibrous porous sound absorbing material such as a synthetic resin fiber, a natural fiber or a recycled fiber, or a foam-like porous sound absorbing material such as a polyethylene foam, a polyurethane foam or a PVC foam can be used. As the inorganic fiber, rock fiber, glass, alumina, silicon carbide, steel and the like fiber, as synthetic resin fiber, polyester, nylon, polyacrylonitrile, polypropylene, polyethylene, polyvinyl chloride and the like fiber, as natural fiber,
Fibers such as wood fiber, cotton, hemp, bamboo, linter, silk and wool, and regenerated fiber include fibers such as rayon.
【０００９】また、エッジ２０としては質量体より剛性
の小さい材料、例えば、ポリエチレンフォーム、ポリウ
レタンフォーム、ＰＶＣフォームなどの樹脂発泡体、種
々の軟質樹脂材料または種々のゴム系材料を用いること
ができる。The edge 20 may be made of a material having rigidity lower than that of the mass body, for example, resin foam such as polyethylene foam, polyurethane foam, PVC foam, various soft resin materials, or various rubber materials.
【００１０】さらに、音波の入射により振動する材料１
０を設置する方法として、同一材料を用いる必要はな
く、例えば、実施例１あるいは２において、材質、厚
さ、面重量等の異なる材料を用いて多孔質吸音材５の上
面あるいは側面に取り付けてもよい。また、音波の入射
により振動する材料１０を、例えば木、鉄、アルミニュ
ウム、アクリル、石膏などの支柱、枠状体あるいは箱状
体、ハニカム構造体、バネ構造体などの支持体により吸
音材５の上面あるいは側面に保持したり、支持してもよ
い。 なお、吸音構造体３の形状、大きさ、及び位置に
ついては、多孔質吸音材５に含まれる空気による弾性層
が確保でき、吸音構造体３の共振を阻害しない限り、ど
の様な形状、寸法であってもよく、また、任意の位置に
も配設してよい。このとき、吸音構造体３の床基材１に
対応する面積は、床基材１の面積に対し約２０％以上で
あることが望ましい。Further, a material 1 which vibrates when a sound wave is incident thereon.
It is not necessary to use the same material as the method for installing 0. For example, in Example 1 or 2, the materials different in material, thickness, surface weight, etc. are used and attached to the upper surface or the side surface of the porous sound absorbing material 5. Good. In addition, the material 10 that vibrates when a sound wave is incident is applied to the sound absorbing material 5 by a support such as a pillar made of wood, iron, aluminum, acrylic, gypsum, a frame-shaped body or a box-shaped body, a honeycomb structure, a spring structure, or the like. It may be held or supported on the upper surface or the side surface. Regarding the shape, size, and position of the sound absorbing structure 3, as long as an elastic layer of air contained in the porous sound absorbing material 5 can be secured and the resonance of the sound absorbing structure 3 is not hindered, what shape and size Or may be arranged at any position. At this time, the area of the sound absorbing structure 3 corresponding to the floor base material 1 is preferably about 20% or more of the area of the floor base material 1.
【００１１】[0011]
【作用】請求項１記載の発明では、音波の入射により振
動する材料１０の質量と、多孔質吸音材５に含まれる空
気による弾性層の体積弾性率（１．４×１０5 Ｐａ）と
その層厚（即ち多孔質吸音材５の層厚）によって決まる
バネにより、特定の共振周波数ｆｒにおいて吸音構造体
３が共振する。その共振に基づく吸音作用によって、床
基材１から放射される音波エネルギーが吸音構造体３自
身の振動エネルギーに変換される。同時に、吸音構造体
３の振動により床下地４側に放射される音波を多孔質吸
音材５の吸音効果により吸収し、且つ床基材１からの音
波が、吸音構造体３の振動により床基材１側に放射され
る音波との干渉作用によって相殺されるため、高い防音
特性が得られる。According to the first aspect of the invention, the mass of the material 10 vibrated by the incidence of sound waves, the bulk elastic modulus (1.4 × 10 5 Pa) of the elastic layer due to the air contained in the porous sound absorbing material 5, and its The sound absorbing structure 3 resonates at a specific resonance frequency fr by the spring determined by the layer thickness (that is, the layer thickness of the porous sound absorbing material 5). The sound absorbing action based on the resonance converts the sound wave energy radiated from the floor base material 1 into the vibration energy of the sound absorbing structure 3 itself. At the same time, the sound wave radiated to the floor base 4 side by the vibration of the sound absorbing structure 3 is absorbed by the sound absorbing effect of the porous sound absorbing material 5, and the sound wave from the floor base material 1 is vibrated by the sound absorbing structure 3 to the floor base material. Since it is canceled by the interference action with the sound wave radiated to the material 1 side, high soundproofing characteristics can be obtained.
【００１２】請求項２記載の発明では、多孔質吸音材５
に含まれる空気による弾性層の体積弾性率（１．４×１
０5 Ｐａ）とその層厚Ｌ（ｍ）、及び質量体の面密度Ｍ
（kg／m 2 ）と剛性Ｋ（Ｎ／m ）により下記の（１）式
を用いてｆｒ（Ｈｚ）が所用に設定できる。According to the second aspect of the invention, the porous sound absorbing material 5 is used.
Bulk modulus of the elastic layer due to air contained in (1.4 × 1
0 5 Pa) and its layer thickness L (m), and areal density M of the mass body.
By using (kg / m 2 ) and rigidity K (N / m), fr (Hz) can be set as desired by using the following equation (1).
【００１３】[0013]
【表１】 [Table 1]
【００１４】（１）式により求められるｆｒ付近の周波
数帯域において、上述の吸音作用及び干渉作用による高
い防音性能が得られる。In the frequency band near fr determined by the equation (1), high soundproofing performance can be obtained by the above sound absorbing action and interference action.
【００１５】請求項３記載の発明では、（１）式におけ
るＫをエッジ２０の剛性におきかえることにより（少な
くとも対向する二辺をより剛性の小さいエッジ２０にお
きかえているので、）弾性層の層厚を薄くしても請求項
２記載の発明と同程度のｆｒが得られるため、ｆｒ付近
の周波数帯域において上述の吸音作用及び干渉作用によ
る高い防音性能が得られる。According to the third aspect of the present invention, K in the equation (1) is replaced by the rigidity of the edge 20 (because at least two opposite sides are replaced by the edge 20 having a smaller rigidity), the layer of the elastic layer. Even if the thickness is reduced, the same level of fr as in the second aspect of the invention can be obtained, so that high soundproofing performance due to the above-described sound absorbing action and interference action can be obtained in the frequency band near fr.
【００１６】[0016]
【実施例】本発明の実施例について以下に説明する。EXAMPLES Examples of the present invention will be described below.
【００１７】図１は本発明に係わる実施例の構成を示す
断面図である。床基材１、支持脚２、防振ゴム６および
床下地４からなる二重床において、多孔質吸音材５と、
当該多孔質吸音材５の床基材１と対応する面に設けられ
且つ音波の入射により振動する材料１０からなる吸音構
造体３が床下地４上に配設された構成となっている。FIG. 1 is a sectional view showing the structure of an embodiment according to the present invention. In the double floor consisting of the floor base 1, the support legs 2, the vibration-proof rubber 6 and the floor base 4, the porous sound absorbing material 5 and
A sound absorbing structure 3 made of a material 10 that is provided on a surface of the porous sound absorbing material 5 corresponding to the floor base material 1 and that vibrates when a sound wave is incident is disposed on a floor base 4.
【００１８】防振ゴム６としては、硬度５０度のものを
用いた。本実施例では防振ゴム６を用いた構成とした
が、下記効果は防振ゴムがない場合も同様に得られる。 （実施例１）図１に示すように、厚さ０．４mm、面密度
０．４kg／m 2 の塩化ビニルシートを音波の入射により
振動する材料１０として、密度２４kg／m 3 、厚さ５０
mmのグラスウールからなる多孔質吸音材５（ヤング率
３．０×１０3 Ｐａ）の上面に設けた吸音構造体３を使
用した。 （実施例２）図２に示すように、厚さ０．１mm、面密度
０．１kg／m 2 の塩化ビニルシートを音波の入射により
振動する材料１０として、密度２４kg／m 3 、幅２００
mm、厚さ７５mmのグラスウールからなる多孔質吸音材５
（ヤング率３．０×１０3Ｐａ）の上面及び側面に設け
た吸音構造体３を使用した。 （実施例３）図３に示すように、厚さ６mmのアルミハニ
カムコア材１４を質量体とし、その周囲に厚さ１mmのポ
リエチレンフォーム製のエッジ２０を設けた振動構造体
を音波の入射により振動する材料１０として、密度２４
kg／m 3 、厚さ５０mmのグラスウールからなる多孔質吸
音材５（ヤング率３．０×１０3 Ｐａ）の上面に設けた
吸音構造体３を使用した。The antivibration rubber 6 has a hardness of 50 degrees. In this embodiment, the antivibration rubber 6 is used, but the following effects can be obtained in the same manner without the antivibration rubber. (Embodiment 1) As shown in FIG. 1, a vinyl chloride sheet having a thickness of 0.4 mm and an areal density of 0.4 kg / m 2 is used as a material 10 which vibrates when a sound wave is incident, and has a density of 24 kg / m 3 and a thickness of 50.
The sound absorbing structure 3 provided on the upper surface of the porous sound absorbing material 5 (Young's modulus of 3.0 × 10 3 Pa) made of glass wool of mm was used. (Example 2) As shown in FIG. 2, as the material 10 that vibrates thickness 0.1 mm, a vinyl chloride surface density 0.1 kg / m 2 sheet by the incident sound wave, density 24 kg / m 3, a width 200
mm, 75 mm thick glass wool porous sound absorbing material 5
The sound absorbing structures 3 provided on the upper and side surfaces (Young's modulus 3.0 × 10 3 Pa) were used. (Embodiment 3) As shown in FIG. 3, an aluminum honeycomb core material 14 having a thickness of 6 mm is used as a mass body, and a vibrating structure having an edge 20 made of polyethylene foam having a thickness of 1 mm is provided around the mass structure by injecting sound waves. As the vibrating material 10, the density 24
The sound absorbing structure 3 provided on the upper surface of the porous sound absorbing material 5 (Young's modulus 3.0 × 10 3 Pa) made of glass wool having a weight of kg / m 3 and a thickness of 50 mm was used.
【００１９】次に、上記実施例の二重床における防音性
能評価結果について説明する。図４は、実施例１の二重
床と、実施例１において吸音構造体を配設していない一
般的な二重床の床衝撃音レベルを各々ａ線およびｂ線で
示している。同図より、実施例１の二重床は低音域の防
音性能が改善され、１２５〜５００Ｈｚ付近で約３〜５
ｄＢ床衝撃音レベルが低減していることがわかる。Next, the soundproof performance evaluation results of the double floor of the above-mentioned embodiment will be described. FIG. 4 shows the floor impact sound levels of the double floor of Example 1 and the general double floor in which the sound absorbing structure is not provided in Example 1 by lines a and b, respectively. From the figure, the double floor of Example 1 has improved soundproofing performance in the low frequency range, and is about 3 to 5 near 125 to 500 Hz.
It can be seen that the dB floor impact sound level is reduced.
【００２０】図５は、実施例２の二重床と、実施例２に
おいて吸音構造体を配設していない一般的な二重床の床
衝撃音レベルを各々ａ線およびｂ線で示している。同図
より、実施例２の二重床は低音域の防音性能が改善さ
れ、１２５〜５００Ｈｚ付近で約３〜５ｄＢ床衝撃音レ
ベルが低減していることがわかる。FIG. 5 shows the floor impact sound levels of the double floor of the second embodiment and the general double floor in which the sound absorbing structure is not provided in the second embodiment, respectively by lines a and b. There is. From the figure, it can be seen that the double floor of Example 2 has improved soundproofing performance in the low frequency range, and the floor impact sound level is reduced by about 3 to 5 dB near 125 to 500 Hz.
【００２１】図６は、実施例３の吸音構造体における吸
音性能をＪＩＳ Ａ１４０９に定める残響室法吸音率の
計測結果である。同図より、図３の吸音構造体における
吸音ピーク周波数は約１６０Ｈｚであることがわかる。
図３の吸音構造体を図１のように配設することにより、
実施例１あるいは実施例２と同程度の防音性能を得るこ
とができる。FIG. 6 shows the results of measurement of the sound absorption coefficient of the reverberation room method, which defines the sound absorbing performance of the sound absorbing structure of Example 3 according to JIS A1409. From the figure, it can be seen that the sound absorbing peak frequency in the sound absorbing structure of FIG. 3 is about 160 Hz.
By arranging the sound absorbing structure of FIG. 3 as shown in FIG.
It is possible to obtain the same soundproofing performance as that of the first or second embodiment.
【００２２】[0022]
【発明の効果】請求項１記載の発明は、二重床を構成す
る床下地上に、多孔質吸音材と多孔質吸音材の少なくと
も床基材と対向する面に設けられ且つ音波の入射により
振動する材料からなる吸音構造体を配設することによ
り、床基材から放射される音波エネルギーに対して吸音
構造体の共振が生じ、音波エネルギーを振動エネルギー
に変換するとともに、吸音構造体の振動により床下地側
に放射される音波を多孔質吸音材の吸音効果により吸収
し且つ床基材からの音波が吸音構造体の振動により床基
材側に放射される音波との干渉作用によって相殺される
ため、高い防音特性が得られる。According to the first aspect of the present invention, a porous sound absorbing material is provided on a floor base constituting a double floor, and at least a surface of the porous sound absorbing material facing the floor base material is vibrated by incidence of sound waves. By arranging the sound absorbing structure made of the material, the sound absorbing structure resonates with the sound energy radiated from the floor base material, the sound energy is converted into vibration energy, and the sound absorbing structure vibrates. The sound wave radiated to the floor base side is absorbed by the sound absorbing effect of the porous sound absorbing material, and the sound wave from the floor base material is canceled by the interference action with the sound wave radiated to the floor base material side due to the vibration of the sound absorbing structure. Therefore, high soundproofing characteristics can be obtained.
【００２３】請求項２記載の発明は、音波の入射により
振動する材料として板状あるいは膜状の質量体を用いる
ことにより、多孔質吸音材に含まれる空気による弾性層
の体積弾性率と層厚、及び質量体の面密度と剛性により
共振周波数が容易に設計できるため、その共振周波数付
近の周波数帯域において、上述の吸音作用及び干渉作用
による高い防音性能が得られる。According to a second aspect of the present invention, by using a plate-shaped or film-shaped mass body as a material that vibrates when a sound wave is incident, the volume elastic modulus and layer thickness of the elastic layer due to air contained in the porous sound absorbing material are used. , And the resonance frequency can be easily designed by the areal density and rigidity of the mass body, so that in the frequency band near the resonance frequency, high sound insulation performance due to the above-described sound absorbing action and interference action can be obtained.
【００２４】請求項３記載の発明は、弾性層の層厚を薄
くしても請求項２記載の発明と同程度の共振周波数が得
られるため、弾性層の層厚に制限の有る場合（例えば、
厚く出来ない場合等）に有効である。According to the third aspect of the present invention, even if the elastic layer is thin, the same resonance frequency as that of the second aspect can be obtained. Therefore, the elastic layer has a limited thickness (for example, ,
It is effective when it cannot be made thick.
【図１】本発明の実施例１における二重床を示す断面図
である。FIG. 1 is a cross-sectional view showing a double floor according to a first embodiment of the present invention.
【図２】本発明の実施例２における吸音構造体を示す図
で、（ａ）は斜視図、（ｂ）は断面図である。2A and 2B are views showing a sound absorbing structure according to a second embodiment of the present invention, in which FIG. 2A is a perspective view and FIG. 2B is a sectional view.
【図３】本発明の実施例３における吸音構造体を示す断
面図である。FIG. 3 is a sectional view showing a sound absorbing structure according to a third embodiment of the present invention.
【図４】本発明の実施例１における防音性能を示すグラ
フである。FIG. 4 is a graph showing soundproofing performance in Example 1 of the present invention.
【図５】本発明の実施例２における防音性能を示すグラ
フである。FIG. 5 is a graph showing soundproofing performance in Example 2 of the present invention.
【図６】本発明の実施例３に使用した吸音構造体の吸音
性能を示すグラフである。FIG. 6 is a graph showing the sound absorbing performance of the sound absorbing structure used in Example 3 of the present invention.
１ 床基材 ２ 支持脚 ３ 吸音構造体 ４ 床下地 ５ 多孔質吸音材 ６ 防振ゴム １０ 音波の入射により振動する材料 １４ アルミハニカムコア材 ２０ エッジ 1 Floor Base Material 2 Support Legs 3 Sound Absorbing Structure 4 Floor Substrate 5 Porous Sound Absorbing Material 6 Vibration Absorbing Rubber 10 Material Vibrating by Incident of Sound Wave 14 Aluminum Honeycomb Core Material 20 Edge
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大西 兼司 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 中村 康輔 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 奥澤 将行 大阪府門真市大字門真1048番地松下電工株 式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Onishi, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Kosuke Nakamura, 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 72) Inventor Masayuki Okusawa 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.
Claims (3)
支持する支持脚２で構成される二重床において、多孔質
吸音材５と、当該多孔質吸音材５の少なくとも床基材１
に対応する面に設けられた音波の入射により振動する材
料１０からなる吸音構造体３を、床下地４上に配設した
ことを特徴とする防音二重床。1. In a double floor composed of a floor base material 1 and support legs 2 for supporting the floor base material 1 on a floor base material 4, at least a porous sound absorbing material 5 and at least the porous sound absorbing material 5 are provided. Floor base 1
A sound-insulating double floor, characterized in that a sound-absorbing structure 3 made of a material 10 that vibrates when a sound wave is incident on the surface corresponding to is disposed on a floor base 4.
て、板状あるいは膜状の質量体を用いたことを特徴とす
る、請求項１記載の防音二重床。2. The soundproof double floor according to claim 1, wherein a plate-shaped or film-shaped mass body is used as the material 10 that vibrates when a sound wave is incident.
て、質量体の少なくとも対向する二辺に当該質量体より
剛性の小さいエッジ２０を設けた振動構造体を用いたこ
とを特徴とする、請求項１記載の防音二重床。3. The vibrating structure, wherein the material 10 vibrated by the incidence of a sound wave is provided with an edge 20 having a rigidity smaller than that of the mass body on at least two opposite sides of the mass body. Soundproof double floor according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1150795A JPH08199782A (en) | 1995-01-27 | 1995-01-27 | Soundproofing double floor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1150795A JPH08199782A (en) | 1995-01-27 | 1995-01-27 | Soundproofing double floor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08199782A true JPH08199782A (en) | 1996-08-06 |
Family
ID=11779942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1150795A Withdrawn JPH08199782A (en) | 1995-01-27 | 1995-01-27 | Soundproofing double floor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08199782A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002138592A (en) * | 2000-10-31 | 2002-05-14 | Daiwa House Ind Co Ltd | Noise control structure for building adopting insulating foundation |
-
1995
- 1995-01-27 JP JP1150795A patent/JPH08199782A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002138592A (en) * | 2000-10-31 | 2002-05-14 | Daiwa House Ind Co Ltd | Noise control structure for building adopting insulating foundation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020402 |