JP3037737B2 - Double floor structure - Google Patents
Double floor structureInfo
- Publication number
- JP3037737B2 JP3037737B2 JP2296416A JP29641690A JP3037737B2 JP 3037737 B2 JP3037737 B2 JP 3037737B2 JP 2296416 A JP2296416 A JP 2296416A JP 29641690 A JP29641690 A JP 29641690A JP 3037737 B2 JP3037737 B2 JP 3037737B2
- Authority
- JP
- Japan
- Prior art keywords
- floor
- sound
- hole
- enlarged
- absorbing
- 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.)
- Expired - Lifetime
Links
Landscapes
- Floor Finish (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は二重床構造に関し、特に階下に伝達される床
衝撃音を低減し得る二重床構造に関する。Description: TECHNICAL FIELD The present invention relates to a double floor structure, and more particularly to a double floor structure capable of reducing a floor impact sound transmitted downstairs.
（従来の技術） 上記の二重床構造としては、コンクリ−ト床スラブ等
からなる床下地上に下面に高さ調節可能な支持脚体が取
り付けられた床パネル材が並置されてなるもの、床下地
上に木製や金属製の根太材が高さ調節可能な支持脚体を
介して配設され該根太材の上にパネル材が敷設されてな
るもの、或いは床下地上に木材ブロック等の支持部材が
支持脚体を介して配設され、該支持部材の上にパネル材
が敷設されてなるもの等が知られている。(Prior Art) The above-mentioned double-floor structure includes a floor base made of a concrete floor slab or the like and floor panel materials having height-adjustable support legs attached to a lower surface, which are arranged side by side. A wooden or metal joist is disposed on the ground via a height-adjustable support leg and a panel material is laid on the joist, or a supporting member such as a wood block is placed on a floor base. It is known that a panel member is provided via a support leg and a panel material is laid on the support member.
このような二重床構造は、床下地上面の不陸を支持脚
体によって吸収できるため床下地を平滑化する手間が不
要であるという利点、及び床パネル材の下方に床下空間
が水平方向に連続しているため床下地上面での配管、配
線工事が容易であるという利点を有しているので、中高
層のビルやマンション等の床に広く採用されている。Such a double-floor structure has an advantage that the unevenness of the upper surface of the floor substrate can be absorbed by the supporting legs, so that the trouble of smoothing the floor substrate is not required, and that the underfloor space is provided horizontally below the floor panel material. Since it is continuous, it has an advantage that piping and wiring work on the floor base upper surface is easy, so that it is widely used for floors of middle and high rise buildings and condominiums.
しかるに、上記二重床構造においては、床仕上げ材を
介して床パネル材に衝撃力が加わった場合、床パネル材
の振動によって床下空間の空気が振動するので、階下に
床衝撃音が発生するという問題がある。However, in the above-mentioned double floor structure, when an impact force is applied to the floor panel material via the floor finishing material, the floor panel material vibrates and the air in the underfloor space vibrates, so that a floor impact sound is generated downstairs. There is a problem.
そこで、第８図に示すように、床下地ａ上に床パネル
材ｂが支持脚体ｃを介して敷設され、床パネル材ｂの上
に捨張り材ｄを介して床仕上げ材ｅが敷設されてなる二
重床構造において、床下地ａの上にグラスウ−ルマット
やロックウ−ルマット等の吸音材ｆを配設し、該吸音材
ｆの表面で床衝撃音を吸音する構造のものが知られてい
る。Therefore, as shown in FIG. 8, a floor panel material b is laid on a floor base a via a supporting leg c, and a floor finishing material e is laid on the floor panel material b via a discard material d. In the double floor structure, a sound absorbing material f such as a glass wool mat or a rock wool mat is disposed on a floor base a, and a floor impact sound is absorbed on the surface of the sound absorbing material f. Have been.
（発明が解決しようとする課題） しかるに、上記のような吸音材は、一般にその表面に
形成された微細な空隙で床衝撃音を吸収するものである
から、周波数の高い高音域の音を良く吸音することがで
きるが、63〜500Hzの中音域〜低音域の床衝撃音は余り
吸音されないのが実状である。このため、従来の防音二
重床構造は、防音効果が高音域に偏ってしまい、低音域
〜中音域の床衝撃音を十分に低減させることができない
という問題があった。(Problems to be Solved by the Invention) However, since the above-described sound absorbing material generally absorbs floor impact sound with fine voids formed on the surface thereof, it can improve high-frequency high-frequency sound. Although sound can be absorbed, floor impact sounds in the mid to low range of 63 to 500 Hz are not absorbed much. For this reason, the conventional soundproof double floor structure has a problem that the soundproofing effect is biased toward a high sound range, and the floor impact sound in the low sound range to the middle sound range cannot be sufficiently reduced.
上記に鑑み、本発明は、高音域のみならず低音域〜中
音域の床衝撃音をも効果的に吸音でき、階下に伝わる床
衝撃音を確実に低減させ得る床構造を提供することを目
的とする。In view of the above, an object of the present invention is to provide a floor structure that can effectively absorb not only a high-frequency range but also a low-range to mid-range floor impact sound, and can reliably reduce a floor impact sound transmitted downstairs. And
（課題を解決するための手段） 上記の目的を達成するため、請求項（１）及び（２）
の発明は、床下空間に拡がる床衝撃音を、吸音材の表面
による吸音と、吸音材に形成したレゾネ−タ−状の拡大
空間の吸音作用とによって吸音するものである。(Means for Solving the Problems) In order to achieve the above object, claims (1) and (2)
According to the invention, the floor impact sound spreading in the underfloor space is absorbed by the sound absorption by the surface of the sound absorbing material and the sound absorbing action of the resonator-shaped enlarged space formed in the sound absorbing material.
具体的に請求項（１）の発明が講じた解決手段は、コ
ンクリ−ト床スラブ等からなる床下地上に床パネル材が
支持脚体を介して敷設されてなる二重床構造を対象と
し、上記床地上に、上側吸音マット材と下側吸音マット
材とからなる積層マットが載置されており、上記上側吸
音マット材には貫通孔が形成されていると共に、上記下
側吸音マット材には、上記貫通孔と連通し且つ上記貫通
孔よりも大きい断面積を持つ拡大貫通孔が形成されてお
り、上記下側吸音マット材の拡大貫通孔と上記床下地と
によって、床衝撃音を吸収する空間部が形成されている
構成とするものである。Specifically, the solution taken by the invention of claim (1) is directed to a double floor structure in which floor panel materials are laid via supporting legs on a floor base made of a concrete floor slab or the like, On the floor, a laminated mat composed of an upper sound absorbing mat material and a lower sound absorbing mat material is placed, and the upper sound absorbing mat material has a through hole formed therein, and the lower sound absorbing mat material has Has an enlarged through-hole communicating with the through-hole and having a larger cross-sectional area than the through-hole, and absorbs floor impact sound by the enlarged through-hole of the lower sound absorbing mat material and the floor base. In this configuration, a space portion is formed.
具体的に請求項（２）の発明が講じた解決手段は、コ
ンクリ−ト床スラブ等からなる床下地上に床パネル材が
支持脚体を介して敷設されてなる二重床構造を対象と
し、上記床地上に、吸音性材料からなる吸音体が載置さ
れており、上記吸音体には、該吸音体の上面で開口する
上面開口部と、該上面開口部よりも大きい断面積を持ち
且つ下方が開放された下方拡大空間部とが形成されてお
り、上記吸音体の下方拡大空間部と上記床下地とによっ
て、床衝撃音を吸収する空間部が形成されている構成と
するものである。Specifically, the solution taken by the invention of claim (2) is directed to a double floor structure in which floor panel materials are laid via supporting legs on a floor base made of a concrete floor slab or the like, On the floor, a sound absorber made of a sound absorbing material is placed, and the sound absorber has an upper surface opening that opens on the upper surface of the sound absorber, and has a larger cross-sectional area than the upper surface opening and A lower enlarged space part whose lower part is opened is formed, and a space part for absorbing a floor impact sound is formed by the lower enlarged space part of the sound absorber and the floor base. .
（作用） 請求項（１）の発明の構成により、床下空間に発生し
た床衝撃音は、まず上側吸音マット材で吸音されるが、
上記上側吸音マット材で吸音しきれなかった低音域〜中
音域の床衝撃音は、上側吸音マット材の貫通孔を介して
下側吸音マット材の拡大貫通孔に入り、下側吸音マット
材の拡大貫通孔の内部で反射を繰り返しながら低減され
る。(Operation) According to the configuration of the invention of claim (1), the floor impact sound generated in the underfloor space is first absorbed by the upper sound absorbing mat material.
The floor impact sound in the low-range to mid-range that could not be completely absorbed by the upper sound-absorbing mat material enters the enlarged through-hole of the lower sound-absorbing mat material through the through hole of the upper sound-absorbing mat material, and It is reduced while repeating reflection inside the enlarged through hole.
また、床衝撃力に伴う床下空間での空気圧力の上昇
は、上側吸音マット材の貫通孔からその下方の下側吸音
マット材の拡大貫通孔の内部で空気圧力が分散されて床
下地に作用する空気圧力が弱められるので、結果として
階下に伝達される床衝撃音が低減される。In addition, the rise in air pressure in the underfloor space due to the floor impact force causes the air pressure to be dispersed from the through hole of the upper sound absorbing mat material to the inside of the enlarged through hole of the lower sound absorbing mat material below and act on the floor substrate. As a result, the floor impact noise transmitted downstairs is reduced.
請求孔（２）の発明の構成により、吸音体に上面開口
部の面積よりも大きい断面積を持つ下方拡大空間部が設
けられているため、上面開口部から下方拡大空間部の内
部に入った低音域〜中音域の床衝撃音は、該下方拡大空
間部の壁面と床下地との間で反射を繰り返しながら低減
する。According to the configuration of the invention of claim hole (2), since the sound absorbing body is provided with the lower enlarged space having a cross-sectional area larger than the area of the upper opening, the sound absorber enters the lower enlarged space from the upper opening. The floor impact sound in the low range to the middle range is reduced while repeating reflection between the wall surface of the lower enlarged space and the floor base.
また、吸音体が吸音性材料よりなるため、床衝撃音は
吸音体の下方拡大空間部における周壁面によって効果的
に吸音されると共に、床衝撃力に伴う床下空間での空気
圧力は吸音体の上面開口部から下方拡大空間部の内部で
分散されて圧力が弱められるので床下地に空気圧力が作
用し難く、階下への床衝撃音の伝達が低減される。In addition, since the sound absorber is made of a sound absorbing material, the floor impact sound is effectively absorbed by the peripheral wall surface in the expanded space below the sound absorber, and the air pressure in the underfloor space due to the floor impact force is reduced by the sound absorber. Since the pressure is weakened by being dispersed from the upper opening to the inside of the lower enlarged space, the air pressure hardly acts on the floor base, and the transmission of the floor impact sound to the downstairs is reduced.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は本発明の第１実施例に係る二重床構造を示
し、該二重床構造は、コンクリ−ト床スラブ等からなる
床下地１の上に複数枚の床パネル材２が複数個の支持脚
体３を介して並置され、床パネル２の上面に捨張り材４
を介して床仕上げ材５が敷設されており、床下地１と床
パネル材２との間に床下空間６が形成されてなるもので
ある。FIG. 1 shows a double floor structure according to a first embodiment of the present invention. In the double floor structure, a plurality of floor panel members 2 are provided on a floor base 1 made of a concrete floor slab or the like. The supporting members 3 are juxtaposed via the support legs 3 and are disposed on the upper surface of the floor panel 2.
A floor finishing material 5 is laid via the base material, and an underfloor space 6 is formed between the floor substrate 1 and the floor panel material 2.
床仕上げ材５としては木質フロア材やカ−ペット材等
を適宜使用でき、また、捨張り材４としては合板等を適
宜使用できる。As the floor finishing material 5, a wooden floor material, a carpet material or the like can be used as appropriate, and as the discarding material 4, plywood or the like can be used as appropriate.
床パネル材２としては、合板やパ−ティクルボ−ド等
の木質板、木質セメント板或いは金属製成形パネル等を
用いることができ、その上に敷設される捨張り材４、床
仕上げ材５及び床上荷重を支持できる程度の剛性を有し
ておれば適宜選択可能である。As the floor panel material 2, a wood board such as a plywood or a particle board, a wood cement board, a metal molded panel, or the like can be used, and a disposing material 4, a floor finishing material 5, It can be appropriately selected as long as it has a rigidity enough to support a load on the floor.
支持脚体３は、床下地１の上面に載置される円錐台状
の弾性体3aと該弾性体3aに立設された高さ調節用の調節
ボルト3bとを有し、調節ボルト3bを回転することにより
レベル調節が可能である。The support leg 3 has a truncated cone-shaped elastic body 3a placed on the upper surface of the floor substrate 1, and an adjustment bolt 3b for height adjustment erected on the elastic body 3a. The level can be adjusted by rotating.
以上のような二重床構造において、本第１実施例の特
徴として、床下地１上における床パネル材２の中央部の
下方に、ロックウ−ルマット、グラスウ−ルマット或い
は発泡プラスチックマット等の吸音材からなる矩形状の
上側吸音マット材7aと、該上側吸音マット材7aの下面に
接着剤等によって一体に積層され上記同様の吸音材から
なる矩形状の下側吸音マット材7bとからなる積層マット
７が載置されている。In the double floor structure as described above, a characteristic of the first embodiment is that a sound absorbing material such as a rock wool mat, a glass wool mat, or a foamed plastic mat is provided below the center of the floor panel material 2 on the floor substrate 1. A laminated mat including a rectangular upper sound absorbing mat member 7a made of: and a rectangular lower sound absorbing mat member 7b integrally laminated on the lower surface of the upper sound absorbing mat member 7a with an adhesive or the like and made of the same sound absorbing material as described above. 7 is placed.
上側吸音マット材7aには、上下に貫通し円形断面を有
する貫通孔7cが３個ずつ設けられていると共に、下側吸
音マット材7bには、上下に貫通して上方で上記貫通孔7c
と連通しており、該貫通孔7cより大きい円形断面を有す
る拡大貫通孔7dが３個ずつ設けられている。The upper sound-absorbing mat member 7a is provided with three through holes 7c each having a circular cross-section and penetrating vertically, and the lower sound-absorbing mat member 7b is provided with the above-described through holes 7c which penetrate vertically and upward.
And three enlarged through holes 7d each having a circular cross section larger than the through hole 7c.
このようにして、貫通孔7cと拡大貫通孔7dとによっ
て、積層マット７の内部に上側よりも下側が拡大した下
方拡大空間が形成されており、該下方拡大空間によって
床下地との間にレゾネ−タ−状の拡大空間部が形成さ
れ、吸音材の表面で吸音しきれなかった床衝撃音は、小
面積の貫通孔7cから大面積の拡大貫通孔7dに移った後、
該拡大貫通孔7dの内部で反射と拡散をしながら吸音され
る。In this way, the through hole 7c and the enlarged through hole 7d form a lower enlarged space in which the lower side is enlarged from the upper side inside the laminated mat 7, and the lower enlarged space forms a resonator between the floor mat and the floor substrate. -A floor-shaped enlarged space portion is formed, and the floor impact sound that could not be completely absorbed on the surface of the sound absorbing material is transferred from the small area through hole 7c to the large area enlarged through hole 7d,
Sound is absorbed while being reflected and diffused inside the enlarged through hole 7d.
また、貫通孔7cを通って拡大貫通孔7dに入った床衝撃
音は面積が大きい拡大貫通孔7dの周壁面によって吸音さ
れると共に、床仕上げ材５の上面に床衝撃力が加わった
際の床下空間６の空気圧力の上昇は上側吸音マット材の
貫通孔を経て容積が大きい拡大貫通孔7dの内部で分散さ
れるため、拡大貫通孔7d内部での空気圧力が弱められて
階下に伝達される床衝撃音は低減される。Further, the floor impact sound that has entered the enlarged through hole 7d through the through hole 7c is absorbed by the peripheral wall surface of the enlarged enlarged hole 7d having a large area, and the floor impact sound is applied to the upper surface of the floor finishing material 5 when the floor impact force is applied. Since the rise in the air pressure in the underfloor space 6 is dispersed inside the enlarged through-hole 7d having a large volume through the through-hole of the upper sound-absorbing mat member, the air pressure inside the enlarged through-hole 7d is weakened and transmitted downstairs. Floor impact noise is reduced.
以上のような観点から、貫通孔7c及び拡大貫通孔7dの
直径は各々以下のように設定することが好ましい。すな
わち、貫通孔7cの直径は１〜8cmが好ましい。その理由
は直径が1cmより小さいと低音域〜中音域の音を貫通孔7
cの内部に取り込み難いためであり、直径が8cmより大き
いと床衝撃音が貫通孔7cの下面開口部から下方に出てし
まいレゾネ−タ−形状に類似する吸音効果が十分に発揮
されないためである。また、拡大貫通孔7dの直径は10cm
以上が好ましい。その理由は直径が10cmより小さいと床
衝撃音の拡散が拡大貫通孔7dの内部で十分に行われない
ためである。さらに、床衝撃音の拡散効果が十分に発揮
されるために拡大貫通孔7dの直径は貫通孔7cの直径の２
倍以上であることが好ましい。From the above viewpoint, it is preferable that the diameters of the through hole 7c and the enlarged through hole 7d are set as follows. That is, the diameter of the through hole 7c is preferably 1 to 8 cm. The reason is that if the diameter is smaller than 1 cm, the low to mid range sound will pass through hole 7.
If the diameter is larger than 8 cm, the floor impact sound will come out from the lower opening of the through hole 7c and the sound absorbing effect similar to the resonator shape will not be sufficiently exhibited. is there. The diameter of the enlarged through hole 7d is 10 cm.
The above is preferred. The reason is that if the diameter is smaller than 10 cm, the floor impact sound is not sufficiently diffused inside the enlarged through hole 7d. Furthermore, the diameter of the enlarged through-hole 7d is two times the diameter of the through-hole 7c so that the floor impact sound diffusion effect is sufficiently exhibited.
It is preferably at least two times.
尚、積層マット７を構成する上側吸音マット材7a及び
下側吸音マット材7bの材質は同種であってもよいし、異
種であってもよい。The materials of the upper sound-absorbing mat member 7a and the lower sound-absorbing mat member 7b constituting the laminated mat 7 may be the same or different.
また、上記実施例においては、床下地１の上に、貫通
孔7cと拡大貫通孔7dとのずれを防止するため、上側吸音
マット材7aと下側吸音マット材7bとが一体化された積層
マットを載置したが、これに代えて、両者を別体にして
床下地１の上に単に重ね合わせておいてもよい。Further, in the above embodiment, the upper sound absorbing mat member 7a and the lower sound absorbing mat member 7b are integrated on the floor substrate 1 in order to prevent the through hole 7c and the enlarged through hole 7d from shifting. The mat is placed, but alternatively, the mats may be separated and simply superimposed on the floor substrate 1.
さらに、上記実施例に代えて、積層マット７の下面に
平坦な吸音マット或いは適宜の板状体やシ−ト状物を積
層し、拡大貫通孔7dの下部開口部を閉塞してもよい。Further, instead of the above embodiment, a flat sound absorbing mat or an appropriate plate-like or sheet-like material may be laminated on the lower surface of the laminated mat 7 to close the lower opening of the enlarged through hole 7d.
第３図及び第４図は上記積層マット７の変形例を示
し、該変形例においては、上側吸音マット材7aには円形
断面を有する一対の貫通孔7cが２か所に設けられ、下側
吸音マット材7bには一対の貫通孔7cに連通する正方形断
面の拡大貫通孔7dが２か所に設けられている。FIGS. 3 and 4 show a modification of the above-mentioned laminated mat 7. In this modification, a pair of through holes 7c having a circular cross section are provided in two places in the upper sound absorbing mat member 7a. The sound-absorbing mat member 7b is provided with two enlarged through holes 7d having a square cross section communicating with the pair of through holes 7c.
第５図は本発明の第２実施例に係る二重床構造を示
し、該二重床構造は上記第１実施例と同様の床下地１、
床パネル材２、支持脚体３、捨張り材４及び床仕上げ材
５を備えている。FIG. 5 shows a double floor structure according to a second embodiment of the present invention.
A floor panel 2, a supporting leg 3, a discarding member 4, and a floor finishing member 5 are provided.
以上のような二重床構造において、本第２実施例の特
徴として、床下地１の上に、ロックウ−ル、グラスウ−
ル或いは発泡プラスチック等の吸音材を凹凸状のマット
に成形してなる吸音体８が配設されており、該吸音体８
には、上下に貫通する円形断面の貫通孔8aと該貫通孔8a
の下面開口部に連続して円錐台状に拡がる下方拡大空間
部8bが２か所に設けられている。In the double floor structure as described above, a feature of the second embodiment is that rock wool and glass wool are placed on the floor base 1.
A sound absorbing body 8 formed by molding a sound absorbing material such as a plastic or a foamed plastic into an uneven mat is provided.
Has a circular cross-sectional through-hole 8a penetrating vertically and the through-hole 8a
There are provided two downwardly extending space portions 8b which extend continuously in a truncated conical shape from the lower surface opening portion.
このようにして本第２実施例に係る二重床構造は、上
下に貫通した貫通孔8aの上面開口部の面積よりも大きい
下方拡大空間部8bを下面側に備えているため、下方拡大
空間部8bによって第１実施例と同様にレゾネ−タ−形状
に類似する吸音効果が得られ、吸音材表面で吸音しきれ
ないような低音域〜中音域の床衝撃音は下方拡大空間部
8bの内部空間と床下地との間で反射をしながら吸音され
る。As described above, the double floor structure according to the second embodiment includes the lower enlarged space portion 8b on the lower surface side that is larger than the area of the upper opening of the through hole 8a that penetrates vertically. By the portion 8b, a sound absorbing effect similar to the shape of the resonator is obtained as in the first embodiment, and the floor impact sound in the low range to the middle range, which cannot be completely absorbed by the surface of the sound absorbing material, is expanded in the downward enlarged space.
The sound is absorbed while reflecting between the interior space of 8b and the floor substrate.
また、床仕上げ材５の上面に床衝撃力が加わった際の
床下空間６の空気圧力は、貫通孔8aを経て容積が大きい
円錐台状の下方拡大空間部8bの内部に分散されるため床
下地１に作用する空気圧力が弱められるので、空気圧力
の上昇が緩和されて階下に伝達される床衝撃音が低減さ
れる。Further, the air pressure in the underfloor space 6 when a floor impact force is applied to the upper surface of the floor finishing material 5 is dispersed through the through-hole 8a into the truncated conical lower enlarged space portion 8b having a large volume, so that the underfloor space 6b is underfloor. Since the air pressure acting on the ground 1 is reduced, the rise in the air pressure is reduced, and the floor impact sound transmitted downstairs is reduced.
さらに、吸音体８を上記のような形状にすると、吸音
性材料を成形することによって吸音体８の高さ、貫通孔
8aの直径或いは下方拡大空間部8bの大きさを所望値に設
定できるため、吸収させる音の音域幅の調整が容易であ
る上に、下方拡大空間部8bを大きくしても吸音体８の立
上り部で強度保持ができ、取り扱いが容易である。Further, when the sound absorbing body 8 is shaped as described above, the height of the sound absorbing body 8 and the height of the through hole are increased by molding a sound absorbing material.
Since the diameter of 8a or the size of the lower enlarged space 8b can be set to a desired value, it is easy to adjust the sound range of the sound to be absorbed, and the rising of the sound absorbing body 8 even if the lower enlarged space 8b is enlarged. The part can maintain strength and is easy to handle.
尚、上記第１及び第２実施例においては、所謂置床構
造の二重床であったが、本発明はこれらに限られず、根
太材を支持脚体等で支持して床面を形成した二重床、或
いは木質ブロックを支持脚体等で支持して床面を形成し
た二重床等であってもよい。In the first and second embodiments, a double floor having a so-called floor structure is used. However, the present invention is not limited to this, and the floor is formed by supporting the joists by supporting legs or the like. A heavy floor or a double floor in which a wooden block is supported by supporting legs or the like to form a floor surface may be used.
以下、本発明を評価するために行なった軽量床衝撃音
の遮音性能テストについて説明する。Hereinafter, a sound insulation performance test of a lightweight floor impact sound performed for evaluating the present invention will be described.
まず、具体例及び比較例共に、厚さ:20mmで910mm×91
0mmの正方形の床パネル材２と、該床パネル材２の下面
に受具を介して取り付けられ高さ:50mmの弾性体3aと長
さ:200mmの調節ボルト3bとを有する支持脚体３とから構
成される床パネルを、厚さ:150mmのコンクリ−ト床スラ
ブの上に載置して平均高さ:175mmの床下空間６を形成
し、上記床パネル材２の上面に厚さ:9mmの捨張り材４を
介して厚さ:12mmの木質床板からなる床仕上げ材５を敷
設して所謂置床構造を形成した。First, both the specific example and the comparative example have a thickness of 910 mm × 91 at 20 mm.
A supporting leg 3 attached to a lower surface of the floor panel 2 via a receiving member and having an elastic body 3a having a height of 50 mm and an adjusting bolt 3b having a length of 200 mm; Is placed on a concrete floor slab having a thickness of 150 mm to form an underfloor space 6 having an average height of 175 mm, and a thickness of 9 mm on the upper surface of the floor panel material 2. A floor finishing material 5 made of a wooden floorboard having a thickness of 12 mm was laid via a discarding material 4 of No. 1 to form a so-called flooring structure.
そして、具体例１としては、密度：約0.1g/cm3のロッ
クウ−ルよりなり、厚さ:25mm、平面形状:303mm×606mm
であって直径:5cmの貫通孔7cを３個有する上側吸音マッ
ト材7aと、密度：約0.1g/cm3のロックウ−ルよりなり、
厚さ:25mm、平面形状:303mm×606mmであって直径:15cm
の拡大貫通孔7dを３個有する下側吸音マット材7dとが、
点状に塗布された接着剤によって貫通孔7cと拡大貫通孔
7dとを各々の中心を一致させて積層された積層マット７
を上記床下地１の上に載置した。As a specific example 1, a rock wool having a density of about 0.1 g / cm 3 is formed, a thickness is 25 mm, and a plane shape is 303 mm × 606 mm.
The upper sound absorbing mat 7a having three through-holes 7c having a diameter of 5 cm, and a rock wool having a density of about 0.1 g / cm 3 ;
Thickness: 25mm, plane shape: 303mm x 606mm and diameter: 15cm
And a lower sound absorbing mat member 7d having three expanded through holes 7d,
The through-hole 7c and the enlarged through-hole by the adhesive applied in the form of dots
7d and a laminated mat 7 which is laminated with their centers aligned.
Was placed on the floor substrate 1 described above.
また、具体例２としては、密度：約0.15g/cm3のロッ
クウ−ルよりなり、平均肉厚:20mm、全体の高さ:60mm、
平面形状:303mm×606mmであって直径:5cmの上面貫通孔8
aと下面側の直径:15cmの円錐台状の下方拡大空間部8bを
有する吸音体８を上記床下地１の上に載置した。Further, as a specific example 2, a density: about 0.15 g / cm 3 of rock wool, an average wall thickness: 20 mm, an overall height: 60 mm,
Plane shape: 303 mm x 606 mm, diameter: 5 cm upper surface through hole 8
a and a sound absorbing body 8 having a truncated cone-shaped lower enlarged space 8b with a diameter of 15 cm on the lower surface side was placed on the floor substrate 1.
また、比較例１としては、具体例１の二重床構造で床
下空間に吸音マットを配置しないで形成した二重床を用
いた。Further, as Comparative Example 1, a double floor having the double floor structure of the specific example 1 and formed without disposing a sound absorbing mat in the underfloor space was used.
さらに、比較例２としては、具体例１の二重床構造に
おける吸音材に代えて、密度：約0.1g/cm3のロックウ−
ルよりなり、厚さ:25mm、平面形状:303mm×606mmであっ
て貫通孔を設けることなく全体が平坦で均一な吸音マッ
トを配置した二重床を用いた。Further, as a comparative example 2, a rock wool having a density of about 0.1 g / cm 3 was used instead of the sound absorbing material having the double floor structure of the specific example 1.
A double floor having a thickness of 25 mm, a planar shape of 303 mm × 606 mm, and a flat, uniform sound absorbing mat without any through holes was used.
具体例1,2及び比較例1,2に対するJIS−Ａ−1418に基
づく軽量床衝撃音の遮音性能テストの結果は第７図に示
す通りである。同図に示すように、比較例１及び２の床
構造の遮音性能は125〜250Hz帯の床衝撃音が大きくてＬ
L−48であったが、具体例１の床構造では63〜500Hzの音
が低減されて遮音性能はＬL−46であり、また具体例２
の床構造の遮音性能は250Hzの音が良く吸音されていて
ＬL−43であって、軽量床衝撃音に対して具体例のもの
は比較例のものに比べて床衝撃音が全体の音域に亘って
吸音されており、防音性能が優れていることが確認され
た。FIG. 7 shows the results of the sound insulation performance test for light weight floor impact sound based on JIS-A-1418 for Specific Examples 1 and 2 and Comparative Examples 1 and 2. As shown in the figure, the sound insulation performance of the floor structures of Comparative Examples 1 and 2 was such that the floor impact sound in the 125 to 250 Hz band was large and L
It was L-48, but in the floor structure of the specific example 1, the sound of 63 to 500 Hz was reduced, the sound insulation performance was LL-46, and the specific example 2
As for the sound insulation performance of the floor structure, the sound of 250Hz is well absorbed and LL-43, and the floor impact sound of the concrete example is lighter than that of the comparative example. It was confirmed that the sound was absorbed over the entire area and the soundproofing performance was excellent.
（発明の効果） 以上説明したように、請求項（１）の発明に係る二重
床構造によると、床下地上に、貫通孔を有する上側吸音
マット材が上記貫通孔に連通し該貫通孔より大きい断面
積の拡大貫通孔を有する下側吸音マット材を介して載置
され、上記貫通孔と拡大貫通孔とによって下方拡大空間
が形成されているため、床下空間に生じた床衝撃音は、
吸音材の表面で吸音されると共に、該表面で吸音しきれ
なかった低音域〜中音域の音が貫通孔の上面開口部から
下方拡大空間に入ってレゾネ−タ−状の拡大空間の内部
で反射を繰り返しながら低減させられ、床衝撃音は拡大
貫通孔の周壁面によって効果的に吸音され、床衝撃力に
伴う床下空間での空気圧力の上昇は拡大貫通孔の内部で
分散される。(Effects of the Invention) As described above, according to the double floor structure according to the invention of claim (1), the upper sound absorbing mat material having the through-hole communicates with the through-hole on the floor base, and It is placed via a lower sound absorbing mat material having an enlarged through hole with a large cross-sectional area, and the lower enlarged space is formed by the through hole and the enlarged through hole.
While sound is absorbed by the surface of the sound-absorbing material, the low- to mid-range sound that could not be completely absorbed by the surface enters the lower enlarged space from the upper opening of the through-hole and enters the inside of the resonator-shaped enlarged space. The reflection is reduced while being repeated, and the floor impact sound is effectively absorbed by the peripheral wall surface of the enlarged through hole, and the rise in air pressure in the underfloor space due to the floor impact force is dispersed inside the enlarged through hole.
また、請求項（２）の発明に係る二重床構造による
と、床下地上に吸音性材料からなり上面開口部の面積よ
りも大きい下方拡大空間部を有する吸音体が載置されて
いるため、上面開口部から下方拡大空間部の内部に入っ
た低音域〜中音域の床衝撃音はレゾネ−タ−状の拡大空
間の壁面で反射を繰り返しながら低減させられ、床衝撃
音は下方拡大空間部の下部周壁面によって効果的に吸音
され、床下空間での空気圧力の上昇は下方拡大空間部の
内部で分散される。According to the double floor structure of the invention of claim (2), since the sound absorbing body made of a sound absorbing material and having a lower enlarged space larger than the area of the upper surface opening is placed on the floor base, The floor to mid-range floor impact sound that enters the interior of the lower enlarged space from the upper opening is reduced while repeating reflections on the walls of the resonator-shaped enlarged space, and the floor impact sound is reduced to the lower enlarged space. The sound is effectively absorbed by the lower peripheral wall surface, and the increase in the air pressure in the underfloor space is dispersed inside the lower enlarged space.
このため、請求項（１）及び（２）の発明によると、
高音域のみならず低音域〜中音域の床衝撃音をも効果的
に吸音できるので、階下に伝わる床衝撃音を確実に低減
させることができる。Therefore, according to the inventions of claims (1) and (2),
Since the floor impact sound in the low to mid range as well as the high range can be effectively absorbed, the floor impact sound transmitted downstairs can be reliably reduced.
第１図及び第２図は本発明の第１実施例に係る二重床構
造を示し、第１図は一部切截斜視図、第２図は一部切截
平面図、第３図及び第４図は上記二重床構造における積
層マットの変形例を示し、第３図は斜視図、第４図は断
面図、第５図及び第６図は本発明の第２実施例に係る二
重床構造を示し、第５図は断面図、第６図は吸音体の一
部切截斜視図、第７図は具体例及び比較例の軽量床衝撃
音に対する遮音性能テスト結果を示す図、第８図は従来
の二重床構造の断面図である。 １……床下地 ２……床パネル材 ３……支持脚体 ４……捨張り材 ５……床仕上げ材 ６……床下空間 ７……積層マット 7a……上側吸音マット材 7b……下側吸音マット材 7c……貫通孔 7d……拡大貫通孔 ８……吸音体 8b……下方拡大空間部1 and 2 show a double floor structure according to a first embodiment of the present invention. FIG. 1 is a partially cutaway perspective view, FIG. 2 is a partially cutaway plan view, FIG. FIG. 4 shows a modified example of the laminated mat in the double floor structure, FIG. 3 is a perspective view, FIG. 4 is a cross-sectional view, and FIGS. 5 and 6 show a second embodiment according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view, FIG. 6 is a partially cutaway perspective view of a sound absorbing body, FIG. 7 is a diagram showing sound insulation performance test results with respect to a lightweight floor impact sound of a specific example and a comparative example, FIG. 8 is a sectional view of a conventional double floor structure. 1 ... floor base 2 ... floor panel material 3 ... support leg 4 ... discarded material 5 ... floor finish material 6 ... underfloor space 7 ... laminated mat 7a ... upper sound absorbing mat material 7b ... lower Side sound absorbing mat material 7c: through hole 7d: expanded through hole 8: sound absorber 8b: lower expanded space
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) E04F 15/20 E04F 15/18 601 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) E04F 15/20 E04F 15/18 601
Claims (2)
に床パネル材が支持脚体を介して敷設されてなる二重床
構造であって、 上記床下地上に、上側吸音マット材と下側吸音マット材
とからなる積層マットが載置されており、 上記上側吸音マット材には貫通孔が形成されていると共
に、上記下側吸音マット材には、上記貫通孔と連通し且
つ上記貫通孔よりも大きい断面積を持つ拡大貫通孔が形
成されており、 上記下側吸音マット材の拡大貫通孔と上記床下地とによ
って、床衝撃音を吸収する空間部が形成されていること
を特徴とする二重床構造。1. A double floor structure comprising a floor panel made of a concrete floor slab or the like and a floor panel material laid via supporting legs, wherein an upper sound absorbing mat material and a lower side are provided on the floor substrate. A laminated mat made of a sound-absorbing mat member is placed, a through-hole is formed in the upper sound-absorbing mat member, and the through-hole communicates with the through-hole in the lower sound-absorbing mat member. An enlarged through-hole having a larger cross-sectional area is formed, and the enlarged through-hole of the lower sound-absorbing mat member and the floor base form a space for absorbing a floor impact sound. Double floor structure.
に床パネル材が支持脚体を介して敷設されてなる二重床
構造であって、 上記床下地上に、吸音性材料からなる吸音体が載置され
ており、 上記吸音体には、該吸音体の上面で開口する上面開口部
と、該上面開口部よりも大きい断面積を持ち且つ下方が
開放された下方拡大空間部とが形成されており、 上記吸音体の下方拡大空間部と上記床下地とによって、
床衝撃音を吸収する空間部が形成されていることを特徴
とする二重床構造。2. A double floor structure in which a floor panel material is laid via supporting legs on a floor base made of a concrete floor slab or the like, and a sound absorber made of a sound absorbing material is provided on the floor base. The sound absorber is formed with an upper surface opening that opens on the upper surface of the sound absorber, and a lower enlarged space portion that has a larger cross-sectional area than the upper surface opening and is open at the bottom. The lower enlarged space portion of the sound absorbing body and the floor base,
Double floor structure characterized by having a space for absorbing floor impact sound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2296416A JP3037737B2 (en) | 1990-10-31 | 1990-10-31 | Double floor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2296416A JP3037737B2 (en) | 1990-10-31 | 1990-10-31 | Double floor structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04169655A JPH04169655A (en) | 1992-06-17 |
| JP3037737B2 true JP3037737B2 (en) | 2000-05-08 |
Family
ID=17833262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2296416A Expired - Lifetime JP3037737B2 (en) | 1990-10-31 | 1990-10-31 | Double floor structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3037737B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100747051B1 (en) * | 2006-06-19 | 2007-08-07 | 한국건설기술연구원 | Modular shock absorber for double-layered floor structure |
| JP2008050941A (en) * | 2007-11-05 | 2008-03-06 | Yamaha Corp | Sound insulating floor |
| JP7039356B2 (en) * | 2018-03-28 | 2022-03-22 | 株式会社熊谷組 | Floor structure |
-
1990
- 1990-10-31 JP JP2296416A patent/JP3037737B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04169655A (en) | 1992-06-17 |
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