【考案の詳細な説明】[Detailed explanation of the idea]
〈産業上の利用分野〉
本考案は、木造建築物の床構造に関する。特に
遮音性を求められる住宅、アパート建築に好まし
い床構造に関する。更には、軽量であつて、遮音
性が高く、地震や台風時の風圧などの床水平方向
からの応力にも強い床構造に関する。
〈従来の技術〉
木造建築物の従来の床構造は第３図のイに示す
ように梁３の上に組まれた根太１に直接構造用の
合板、フローリング、荒板などの床板２を張る強
度のみに着目した構造で、音響的な配慮はされて
いない床構造であつた。
しかし、最近では建築物に対する要求性能のグ
レードが高くなつてきており、遮音の問題も大き
な関心の一つになつている。例えば昭和54年に施
行されたJIS−Ａ−1419「建築物のしや音等級」で
は床衝撃音レベルも規定されている。このような
現状から上下室間の平均音圧レベル（他の部屋で
発している音のレベルが別の部屋でどの程度の差
で聞こえるかという音圧レベル）及び衝撃音の遮
断性能の向上の為に、種々の床構造が提案されて
いるが、木造建築物に対応可能なものが少なかつ
た。
最近、上記問題点から、枠組壁工法の建築に於
いて、遮音性の構造の一方法として第３図ロに示
す床板２の上にシンダーコンクリート又はセルフ
レベリング材１１を施工し、床の質量及び剛性を
高め、床の遮音性能を向上させる方法が提案さ
れ、採用されている。
又、ALC版を木造建築物の床に用いれば、在
来工法の床に比べ、上階の騒音や衝撃音を緩和で
きることは、例えば特開昭58−29960号公報の例
を引くまでもなく公知であり、実開昭55−123549
号公報のように床下地板と床仕上げ材の間に弾性
板を介在させ、その緩衝作用で床衝撃力の伝播を
少なくするような構造が公知である。
〈考案が解決しようとする課題〉
しかし、上記のシンダーコンクリート又はセル
フレベリング材を施工する方法は、湿式工法であ
り、遮音性能を得るには充分な厚さの層とする必
要があり、このような厚さとすると硬化するまで
には流動性があるので、建築現場で流れ防止のた
めに防水シート工事やその他の補助作業が必要で
あつた。
更に、流れ防止対策に完璧を期すことは非常に
困難で、当該階及び直下の仕上げ材を汚染するこ
とがあつた。又、遮音性能が得られる厚さとする
と硬化するまでに日数を要し、工期の短縮ができ
ず、経済的でなく、硬化後は乾燥収縮によるクラ
ツク発生の恐れがあつた。しかも、遮音量を高め
るため床構造自体の質量が高くなつてしまうとい
う欠点があつた。
又、ALC版を床や屋根に用いる場合は、ALC
構造設計基準に示されるように、地震や台風時の
風圧などの水平方向から床、屋根に掛かる応力に
よる剪断力（水平剪断力）はALC版を単にボル
ト止めするなどでは、ALC版を破壊する大きさ
なので、この水平剪断力はALC版以外に鉄筋等
の水平に張つたブレース等の構造を必要とする。
特開昭58−29960号公報に記載された構造では、
これらのブレース構造についての記載がないが、
地震や台風時に耐える実際の木造建築物とするに
は、上記のブレース構造が必須である。このよう
に、従来のALC版を用いた公知の工法も、木材
以外に鉄筋等の水平ブレースを用いることが必要
であるという欠点があり、木材を主要構造部材と
する在来軸組工法とは言い難く、実用性がない。
一方、JIS−Ａ−1419では床の衝撃源として、重
量と軽量の２種を規定しているが、床仕上げ材の
直下に弾性板を介在させる工法は、軽量衝撃源に
はある程度の効果が認められるものの、重量衝撃
源の改良には殆ど寄与しないことが明らかになつ
ている。
上記したように、従来の工法はそれぞれ根本的
な欠点を有しており、地震や台風時の風圧などに
耐えて木造軸組在来工法に於ける施工法を大きく
変えることなく、重量衝撃源にも効果的な、安定
した床構造は知られていなかつた。
〈課題を解決するための手段〉
本考案は、上記の課題を解決し、床構造が軽量
であつても、遮音性が高く、勿論、地震や台風時
の風圧などに耐え、しかも概ね乾式工法によつて
在来の木造軸組工法による木造建築物の床構造を
提供することを目的とするものであり、この目的
を木造建築物の梁上に根太組みすると共に、その
上に湯を敷設し、さらにその上に軽量気泡コンク
リート板を上記床板にビス止めしてなる木造建築
物の床構造とすることにより達成したものであ
る。
この場合、軽量気泡コンクリート板と床板との
間には、適当な時間流動性を持ち、その後、固化
する充填材が介在されてなる構造や、軽量気泡コ
ンクリート板相互の隙間には、目地部を密封する
密封材が埋め込まれてなる構造が好ましい実施態
様として挙げられる。
この考案で使用される軽量気泡コンクリート板
としては、木ネジ等によりビス止めできるもので
あればよく、メタルラス網等を埋設した厚さが薄
いALC版が例として挙げられる。
この考案で使用される床板としては、従来木造
建築物で一般に用いられているものであればよ
く、中でも代表例として挙げられるのは構造用合
板である。
好ましい実施態様で軽量気泡コンクリート板と
床板との間に充填される適当な時間流動性を持
ち、その後、固化する充填材としては、その流動
性により両面を密着可能にして硬化するものであ
ればよく、空練りモルタル等の砂状で施工時には
施工可能で径時後硬化する水硬性の砂状材や、ゴ
ム系や合成樹脂系の接着剤が代表例として挙げら
れる。
好ましい実施態様で軽量気泡コンクリート板相
互の隙間には、目地部を密封する密封材として
は、コーキング材、モルタル等の目地を密封でき
る材料であればよい。
また、本考案の床構造の上に、ニードルパンチ
材、長尺塩ビシート、化粧合板等の各種床仕上げ
材を施すのが普通の実施態様である。
〈作用〉
本考案の床構造は、軽量気泡コンクリート板の
下に床板が存在し、しかも、軽量気泡コンクリー
ト板がビス止めにより床板に一体化されるので、
地震や台風時の風圧などによる水平剪断力に耐
え、その上、軽量気泡コンクリート板がビス止め
により床板に一体化されるため、軽量であつても
浮き・狂いがなく、二次固体音の発生もない。
又、本考案の床構造は軽量気泡コンクリート板
がビス止めにより床板に一体化されるため、床全
体の剛性が高まり、その結果、実施例に示すよう
に、JIS−Ａ−1419の床衝撃音レベルに関する遮
音等級の評価で、従来の床より２ランク以上の改
善が見られる。上下室間の平均音圧レベルに関し
ても同様な作用・効果が認められる。
このような遮音機構は実開昭55−123549号公報
に見られる弾性板による緩衝作用で伝播を少なく
する機構と異なり、安定した遮音効果を発揮す
る。
勿論、本考案の床構造は、本質的には床板と軽
量気泡コンクリートとをビスで代表される物理的
に安定した手段で固定するので、湿式工法のよう
に界面で剥離する恐れもない。
更に、好ましい実施態様として示したように、
軽量気泡コンクリート板と床板との間に充填材が
介在されれば、現場の施工精度が不良で床板に不
陸が発生しても充填材により軽量気泡コンクリー
ト板と床板とに生ずる隙間を埋め、隙間の為に発
生するであろう二次固体音の発生を防止し、又隙
間の為に発生するであろう軽量気泡コンクリート
板の上からの荷重によるヒビ割れを防止する。こ
のように充填材は両板間の一体性を増すためのも
のである。
また更に、好ましい実施態様として示した軽量
気泡コンクリート板相互の隙間の目地部を密封す
る密封材は、現場の施工精度が不良で軽量気泡コ
ンクリート板相互間に隙間が生じても、密封材に
より上下室間の平均音圧レベル差の確保ができ、
音響的に安定した性能の床構造とするものであ
る。
〈実施例〉
以下、本考案を図示する一実施例により説明す
る。
第１図は実施例を示す一部切り欠き斜視図で、
第２図はその断面図である。
図により説明すると木造梁３の上に梁と直角に
木根太１を組み、その上に構造用合板よりなる床
板２を敷設して、ビスにより根太１に止める。
次に床板に不陸が発生している場合には、ポル
トランドセメント（白セメント）３０重量部、軽
量骨材６８重量部、添加剤（保水及び増粘材）２
重量部を混合し充填材６を床板２の上に厚くても
10mm程度設け、適当な粘度の時に35〜50mm厚さの
ALC板４をその上からビス５により床板２に止
める。
又、敷設したALC板４の相互間に隙間が生じ
ている場合には、（多くの場合目地部が隙間とな
るが）ALC板４相互の目地部にはモルタルを密
封材７として埋め込む。
このようにして本考案の床構造が構成される。
その後、ALC板４の表面の耐磨耗性の向上や不
陸調整のため、厚さ２〜５mm程度にセメント系下
地調整塗材（ポルトランドセメント（白セメン
ト）３０重量部、骨材４０重量部、顔料２０重量
部、アクリル系エマルジヨン１０重量部、添加剤
若干よりなる。）を施し、ニードルパンチ、長尺
塩ビシート、もしくは化粧合板等の床仕上げ剤９
を施す。
勿論、前記したように充填剤６及び密封材７は
不必要ならば省いてもよい。
次に本考案の遮音性能を記載する。
JIS−Ａ−1419に規定される重量衝撃音の低減
に効果を示す実験として、上階178.5m3、下階
134.2m3の室容積を持つ残響室間の床部分に1720
mm×2720mmの床の実大模型をつくり、JIS−Ａ−
1418に準じた加撃を行つた。実大模型の概要を示
せば、従来床の例として、根太（断面寸法105mm
×45mm）を303mm間隔に配し、構造用合板15mmを
全面に敷設し釘打ち施工した。天井として野縁組
みのうえプラスターボード厚さ９mmを張り、根太
から吊木を用いて設置した。天井内には、グラス
ウール厚さ50mmを挿入した。本願考案の床とし
て、上記構造の上面に軽量気泡コンクリート板厚
さ37mmをビス止めにより敷設した。このように構
成した床面を加撃を行つて下階の重量衝撃音レベ
ルを測定した。
しかし、下階で測定した重量衝撃音レベルは、
下階室内の吸音力（即ち、下階に使用された各種
材料の各々の面積にその吸音率を乗じた値の総計
値、単位はm2になる。）によつて異なつた値にな
る。
そこでJIS−Ａ−1416の音響透過損失の算出式
を利用すると、下階の吸音力がＡm2であるときの
下階で測定した重量衝撃音レベルがＬである場
合、下階の吸音力A0m2とした際の重量衝撃音レ
ベルLaは次の(1)式で求められる。
La＝Ｌ＋logA／A0 ……(1)
また、上記の下階残響室に於ける吸音力Ａは、
JIS−Ａ−1416に規定された下の(2)式を用いて求
めた。
Ａ＝55.3／ｃ・Ｖ・１／Ｔ ……(2)
この(2)式でＴは下階の残響時間（秒）であり、
Ｖは下階の容積（m3）であり、ｃは空気中の音速
（単位はｍ／秒であり、ｃ＝331.5＋0.61t（ｔは空
気の温度℃）から求められる値である。このよう
にして吸音力Ａを算出した。
一方、実際の建築物における場合の受音室の吸
音力は10m2と考えられているので、上記のA0と
して10を代入し、更に、上記の測定から得られた
吸音力Ａと重量衝撃音レベルＬとを使用して、(1)
式により実際の建物の値に相当する重量衝撃音レ
ベルLoを算出した。その結果を下表に示す。
<Industrial Application Field> The present invention relates to the floor structure of wooden buildings. In particular, it relates to a floor structure that is preferable for houses and apartment buildings that require sound insulation. Furthermore, the present invention relates to a floor structure that is lightweight, has high sound insulation properties, and is resistant to stress in the horizontal direction of the floor, such as wind pressure during earthquakes and typhoons. <Prior art> In the conventional floor structure of a wooden building, as shown in Fig. 3A, floorboards 2 such as structural plywood, flooring, rough boards, etc. are directly placed on joists 1 built on beams 3. The floor structure was designed with only strength in mind, and no consideration was given to acoustics. However, recently, the performance requirements for buildings have become higher, and the issue of sound insulation has become a major concern. For example, JIS-A-1419 ``Sound Classification of Buildings'', which was enacted in 1974, also stipulates floor impact sound levels. Given this current situation, it is important to improve the average sound pressure level between the upper and lower rooms (the sound pressure level that indicates the difference in the level of sound emitted from one room to another) and the impact sound isolation performance. Various floor structures have been proposed for this purpose, but few are compatible with wooden buildings. Recently, due to the above-mentioned problems, in construction using the frame wall method, cinder concrete or self-leveling material 11 is constructed on the floor plate 2 shown in Figure 3B as a method of sound insulation structure, and the mass and weight of the floor are reduced. Methods have been proposed and adopted to increase the rigidity and improve the sound insulation performance of floors. In addition, it is needless to mention, for example, the example of Japanese Patent Application Laid-Open No. 58-29960 that if ALC plates are used for the floors of wooden buildings, noise and impact sounds from upper floors can be reduced compared to floors made using conventional construction methods. It is publicly known and published in Utility Model Application No. 55-123549.
A structure is known in which an elastic plate is interposed between a floor base plate and a floor finishing material, and the propagation of floor impact force is reduced by the buffering effect of the elastic plate, as shown in Japanese Patent Application No. <Problem to be solved by the invention> However, the method of constructing cinder concrete or self-leveling material described above is a wet construction method, and the layer must be thick enough to obtain sound insulation performance. If it is thick enough, it will be fluid until it hardens, so construction of tarpaulins and other auxiliary work was necessary to prevent it from flowing at the construction site. Furthermore, it was extremely difficult to perfect the flow prevention measures, and the finishing materials on the floor concerned and immediately below were sometimes contaminated. Furthermore, if the thickness is set to provide sound insulation performance, it will take several days to cure, making it impossible to shorten the construction period and being uneconomical, and there is a risk of cracks occurring due to drying shrinkage after curing. Moreover, there was a drawback that the mass of the floor structure itself increased in order to increase the amount of insulation. In addition, when using the ALC version for floors and roofs, please use the ALC version.
As shown in the structural design standards, the shearing force (horizontal shear force) due to stress applied horizontally to the floor and roof due to wind pressure during earthquakes and typhoons will destroy the ALC plate if it is simply bolted together. Due to its size, this horizontal shear force requires structures such as horizontal braces such as reinforcing bars in addition to the ALC plate.
In the structure described in Japanese Patent Application Laid-Open No. 58-29960,
Although there is no description of the structure of these braces,
The above-mentioned brace structure is essential for actual wooden buildings to withstand earthquakes and typhoons. As described above, the conventional construction method using ALC plates also has the disadvantage of requiring the use of horizontal braces such as reinforcing bars in addition to wood, and is different from the conventional frame construction method in which wood is the main structural member. It's hard to say and it's not practical.
On the other hand, JIS-A-1419 stipulates two types of floor impact sources: heavy and lightweight, but the method of interposing an elastic plate directly under the floor finishing material is somewhat effective against lightweight impact sources. Although this is recognized, it has become clear that it hardly contributes to the improvement of the weight impact source. As mentioned above, each of the conventional construction methods has fundamental drawbacks, and it is possible to withstand wind pressure during earthquakes and typhoons without significantly changing the construction method of the conventional wooden frame construction method. There was no known stable floor structure that would be effective. <Means for solving the problems> The present invention solves the above problems, and even though the floor structure is lightweight, it has high sound insulation properties, withstands wind pressure during earthquakes and typhoons, and moreover, it can be constructed using dry construction methods. The purpose of this project is to provide a floor structure for wooden buildings using the conventional wooden framework construction method. Furthermore, this was achieved by creating a floor structure for a wooden building by fixing lightweight cellular concrete plates to the floor plate with screws. In this case, there is a structure in which a filler that has fluidity for an appropriate period of time and then solidifies is interposed between the lightweight cellular concrete plates and the floorboard, and joints are provided in the gaps between the lightweight cellular concrete plates. A preferred embodiment includes a structure in which a sealant for sealing is embedded. The lightweight aerated concrete plates used in this invention may be of any type as long as they can be fastened with wood screws or the like, and an example is a thin ALC plate with embedded metal lath mesh or the like. The floorboards used in this invention may be of any type commonly used in conventional wooden buildings, with structural plywood being a typical example. In a preferred embodiment, the filler that is filled between the lightweight cellular concrete board and the floorboard and has fluidity for an appropriate period of time and then hardens, is any filler that hardens by allowing both sides to adhere to each other due to its fluidity. Typical examples include hydraulic sand-like materials such as dry-kneaded mortar that can be applied during construction and harden after installation, and rubber-based and synthetic resin-based adhesives. In a preferred embodiment, the sealing material for sealing the joints in the gaps between the lightweight cellular concrete plates may be any material capable of sealing the joints, such as caulking or mortar. Further, it is a common practice to apply various floor finishing materials such as needle punched materials, long PVC sheets, decorative plywood, etc. on the floor structure of the present invention. <Function> The floor structure of the present invention has a floor plate under the lightweight cellular concrete plate, and the lightweight cellular concrete plate is integrated with the floor plate by screws.
It withstands horizontal shearing force caused by wind pressure during earthquakes and typhoons, and in addition, the lightweight aerated concrete board is integrated into the floorboard with screws, so even though it is lightweight, it does not float or shift, and it does not generate secondary solid sound. Nor. In addition, in the floor structure of the present invention, the lightweight aerated concrete plates are integrated into the floorboard by screws, which increases the rigidity of the entire floor.As a result, as shown in the example, the floor impact noise of JIS-A-1419 is improved. Evaluation of the sound insulation class shows an improvement of more than 2 ranks compared to conventional floors. Similar actions and effects are observed regarding the average sound pressure level between the upper and lower chambers. Such a sound insulation mechanism exhibits a stable sound insulation effect, unlike the mechanism shown in Japanese Utility Model Application Publication No. 55-123549, which reduces propagation through the buffering action of an elastic plate. Of course, the floor structure of the present invention essentially fixes the floorboard and the lightweight cellular concrete using physically stable means such as screws, so there is no risk of separation at the interface unlike in wet construction methods. Furthermore, as shown in the preferred embodiment,
If a filler material is interposed between the lightweight aerated concrete board and the floorboard, even if the floorboard becomes uneven due to poor construction accuracy on site, the filler will fill the gap between the lightweight aerated concrete board and the floorboard. To prevent the generation of secondary solid sound that would occur due to gaps, and also to prevent cracks due to loads from above on lightweight aerated concrete plates that would occur due to gaps. In this way, the filler is used to increase the integrity between the two plates. Furthermore, the sealing material that seals the joints between the lightweight aerated concrete plates shown as a preferred embodiment can be used even if gaps are created between the lightweight aerated concrete plates due to poor construction accuracy at the site. It is possible to ensure the average sound pressure level difference between rooms,
The floor structure is designed to provide acoustically stable performance. <Example> The present invention will be described below with reference to an illustrative example. FIG. 1 is a partially cutaway perspective view showing an embodiment.
FIG. 2 is a sectional view thereof. To explain with the drawing, a wooden joist 1 is assembled on a wooden beam 3 at right angles to the beam, a floor board 2 made of structural plywood is laid on top of the wooden joist 1, and it is fixed to the joist 1 with screws. Next, if the floorboards are uneven, use 30 parts by weight of Portland cement (white cement), 68 parts by weight of lightweight aggregate, and 2 parts of additives (water retention and thickening agent).
Mix the weight parts and apply the filler 6 on the floorboard 2 even if it is thick.
10mm, and 35~50mm thick when the viscosity is appropriate.
The ALC board 4 is fixed to the floor board 2 with screws 5 from above. Further, if there is a gap between the installed ALC boards 4 (in most cases, the joints are gaps), mortar is embedded in the joints between the ALC boards 4 as a sealant 7. In this way, the floor structure of the present invention is constructed.
After that, in order to improve the abrasion resistance and adjust the unevenness of the surface of the ALC board 4, a cement-based base conditioning coating (30 parts by weight of Portland cement (white cement) and 40 parts by weight of aggregate) was applied to a thickness of about 2 to 5 mm. , 20 parts by weight of pigment, 10 parts by weight of acrylic emulsion, and some additives), and floor finishing agent such as needle punch, long PVC sheet, or decorative plywood 9
administer. Of course, as described above, the filler 6 and the sealant 7 may be omitted if unnecessary. Next, the sound insulation performance of the present invention will be described. As an experiment to demonstrate the effectiveness in reducing weight impact noise specified in JIS-A-1419, the upper floor is 178.5 m 3 and the lower floor is
1720 on the floor between the reverberation chambers with a room volume of 134.2m3
A full-scale model of the floor measuring mm x 2720 mm was made and JIS-A-
The attack was carried out in accordance with 1418. To give an overview of the full-scale model, as an example of a conventional floor, there is a floor joist (cross-sectional dimension 105 mm).
x 45mm) were arranged at 303mm intervals, and 15mm structural plywood was laid over the entire surface and nailed. For the ceiling, a 9mm thick plasterboard was laid out using a field tile and hung from the joists using hanging wood. Glass wool with a thickness of 50 mm was inserted into the ceiling. As the floor of the present invention, a lightweight aerated concrete board with a thickness of 37 mm was laid on the top surface of the above structure with screws. The floor constructed in this manner was subjected to an impact attack to measure the weight impact sound level on the lower floor. However, the weight impact sound level measured on the lower floor was
The value differs depending on the sound absorption capacity in the lower floor room (that is, the total value of the area of each material used in the lower floor multiplied by its sound absorption coefficient, the unit is m2 ). Therefore, using the sound transmission loss calculation formula of JIS-A-1416, if the sound absorption power of the lower floor is Am 2 and the weight impact sound level measured on the lower floor is L, the sound absorption power of the lower floor is A The weight impact sound level L a when 0 m 2 is calculated using the following equation (1). L a = L + logA/A 0 ...(1) Also, the sound absorption power A in the above-mentioned lower reverberation room is:
It was determined using the equation (2) below specified in JIS-A-1416. A=55.3/c・V・1/T...(2) In this equation (2), T is the reverberation time (seconds) on the lower floor,
V is the volume of the lower floor (m 3 ), and c is the speed of sound in the air (unit: m/sec, which is a value obtained from c = 331.5 + 0.61t (t is the temperature of the air in °C). The sound absorption power A was calculated in this way. On the other hand, since the sound absorption power of a sound receiving room in an actual building is considered to be 10 m 2 , 10 was substituted for A 0 above, and the above measurement Using the sound absorption force A and weight impact sound level L obtained from (1)
The weight impact sound level L o corresponding to the value of the actual building was calculated using the formula. The results are shown in the table below.
【表】
各々の周波数で遮音効果が見られ、JIS−Ａ−
1416の床衝撃音レベルに規定される遮音等級に準
じて評価すれば、従来床がＬ−72に、本願考案床
がＬ−69となり、３ランクの改善が見られた。
〈考案の効果〉
本考案の床構造は、木造建築物の床構造であつ
て、梁上に根太組みすると共に、その上に床板を
敷設し、さらにその上に軽量気泡コンクリート板
を上記床板にビス止めしてなることを特徴とする
ものであり、次の効果を奏する。
軽量気泡コンクリート板が床板にビスにより
一体に固定された構造であり、軽量気泡コンク
リート板の下に床板が存在する構造であるの
で、従来の軽量気泡コンクリート版を床に用い
た工法のように鉄筋等の水平に張つたブレース
等の構造を必要とせずに、地震や台風時の風圧
など水平方向から掛かる応力による剪断力（水
平剪断力）による軽量気泡コンクリート板の剪
断破壊を妨げ、実用性がある木造建築物とな
る。
軽量気泡コンクリート板が床材にビスにより
一体に固着されているため、床衝撃音等に対す
る遮音性が得られる。
従来の湿式工法に比べ、概ね乾式工法による
ため、養生日数が要らず、工期の短縮ができ、
汚れ防止が図れる。
施工が容易で、施工のため特殊な機械類を必
要とせず、大工職が従来の技術で施工が可能で
ある。
更に、好ましい実施態様として示したように、
軽量気泡コンクリート板と床板との間に充填材が
介在されれば、現場の施工精度が不良で床板に不
陸が発生しても充填材により軽量気泡コンクリー
ト板と床板とに生ずる隙間を埋め、隙間の為に発
生するであろう二次固体音の発生を防止し、又隙
間の為に発生するであろう軽量気泡コンクリート
板の上からの荷重によるヒビ割れを防止する。
また更に、好ましい実施態様として示した軽量
気泡コンクリート板相互の隙間の目地部を密封す
る密封材を使用すると、現場の施工精度が不良で
軽量気泡コンクリート板相互間に隙間が生じて
も、密封材により上下室間の平均音圧レベル差の
確保ができ、音響的に安定した性能の床構造とで
きる。[Table] Sound insulation effect can be seen at each frequency, JIS-A-
When evaluated according to the sound insulation grade specified by the floor impact sound level of 1416, the conventional floor was rated L-72, and the floor designed by the present invention was rated L-69, an improvement of 3 ranks. <Effects of the invention> The floor structure of the invention is a floor structure for a wooden building, in which joists are constructed on beams, floor boards are laid on top of the joists, and lightweight aerated concrete boards are further placed on top of the floor boards. It is characterized by being fixed with screws, and has the following effects. The structure is such that the lightweight cellular concrete board is integrally fixed to the floorboard with screws, and the floorboard is under the lightweight cellular concrete board. It is practical because it prevents shear failure of lightweight aerated concrete plates due to shear force (horizontal shear force) caused by stress applied in the horizontal direction, such as wind pressure during earthquakes and typhoons, without requiring structures such as horizontally stretched braces. It becomes a wooden building. Since the lightweight cellular concrete board is integrally fixed to the flooring material with screws, it provides sound insulation against floor impact noise, etc. Compared to the conventional wet construction method, since it is mostly a dry construction method, it does not require curing days, which shortens the construction period.
Prevents dirt. It is easy to construct, does not require special machinery, and can be constructed by carpenters using conventional techniques. Furthermore, as shown in the preferred embodiment,
If a filler material is interposed between the lightweight aerated concrete board and the floorboard, even if the floorboard becomes uneven due to poor construction accuracy on site, the filler will fill the gap between the lightweight aerated concrete board and the floorboard. To prevent the generation of secondary solid sound that would occur due to gaps, and also to prevent cracks due to loads from above on lightweight aerated concrete plates that would occur due to gaps. Furthermore, if a sealant is used to seal the joints between the lightweight aerated concrete plates as shown in the preferred embodiment, even if gaps are created between the lightweight aerated concrete plates due to poor construction accuracy on site, the sealant can be used to seal the joints between the lightweight aerated concrete plates. This ensures a difference in average sound pressure level between the upper and lower rooms, resulting in a floor structure with acoustically stable performance.
【図面の簡単な説明】[Brief explanation of the drawing]
第１図は実施例を示す一部切り欠き斜視図で、
第２図はその断面図である。第３図イ，ロは従来
の床構造を示す断面図である。
１……根太、２……床板、３……梁、４……軽
量気泡コンクリート板（ALC板）、５……ビス、
６……充填材、７……密封材、９……仕上げ材、
１０……天井、１１……吸音材、１３……天井
材、１４……吊り木、１５……吊り木受け。
FIG. 1 is a partially cutaway perspective view showing an embodiment.
FIG. 2 is a sectional view thereof. FIGS. 3A and 3B are sectional views showing a conventional floor structure. 1...joist, 2...floor board, 3...beam, 4...lightweight aerated concrete board (ALC board), 5...screw,
6...Filling material, 7...Sealing material, 9...Finishing material,
10...Ceiling, 11...Sound absorbing material, 13...Ceiling material, 14...Hanging tree, 15...Hanging tree support.