JP2011256617A - Ceiling panel vibration control structure - Google Patents

Ceiling panel vibration control structure Download PDF

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JP2011256617A
JP2011256617A JP2010132555A JP2010132555A JP2011256617A JP 2011256617 A JP2011256617 A JP 2011256617A JP 2010132555 A JP2010132555 A JP 2010132555A JP 2010132555 A JP2010132555 A JP 2010132555A JP 2011256617 A JP2011256617 A JP 2011256617A
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ceiling
ceiling panel
damping material
panels
floor
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JP5620156B2 (en
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Haruo Gen
晴夫 玄
Shohei Watanabe
将平 渡辺
Masanobu Momota
雅信 百田
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Daiwa House Industry Co Ltd
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Daiwa House Industry Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a ceiling panel vibration damping structure capable of damping floor impact noises from upper floors in a building provided with a ceiling panel as a ceiling interior substrate material.SOLUTION: The ceiling vibration damping structure 1 improves insulating performance on floor impact noises from upper floors in a building. At least two or more ceiling panels 2 are provided in a ceiling of lower floors as an interior substrate material, and are connected to each other by a restrictive damping material 3. Relative displacement of the ceiling panels 2 are restricted by the rigidity of the restrictive damping material 3; due to deformation of the restrictive damping material 3, the ceiling vibration damping structure 1 absorbs the relative displacement energy generated from the ceiling panels 2.

Description

本発明は、建物の上階から下階へ伝わる床衝撃音の性能向上を図る天井パネルの制振構造に関する。   The present invention relates to a vibration damping structure for a ceiling panel that improves the performance of floor impact sound transmitted from the upper floor to the lower floor of a building.

建物、特に戸建て住宅や低層の集合住宅では、上階での床の衝撃による振動が下階に伝わり、衝撃音となって下階での居住性に影響を与える。そこで、床衝撃音性能の向上を図るために、天井の重量を重くしたり、天井部に吸音材を設けたり、天井仕上げ材の下地材となる天井パネルを防振吊構造とするなどさまざまな工法が提案されている。   In buildings, especially single-family houses and low-rise apartments, vibration due to the impact of the floor on the upper floor is transmitted to the lower floor, and impact noise is affected. Therefore, in order to improve floor impact sound performance, the ceiling weight is increased, a sound absorbing material is provided on the ceiling, and the ceiling panel that is the base material for the ceiling finishing material has a vibration-proof suspension structure. A construction method has been proposed.

特開２００９−２７０２８６号公報JP 2009-270286 A

特に、天井の下地材として、軽量の鋼材からなる軽鉄天井パネルを用いる場合、それぞれの軽鉄天井パネルが梁に吊り材により支持されていても、それぞれの軽鉄天井パネル間の拘束は弱く、上階の床に衝撃が加わった場合、その衝撃は床や梁、吊り材を介して軽鉄天井パネルに伝わり、それぞれの軽鉄天井パネルがばらばらに振動することにより、下階へ音を放射してしまう。   In particular, when light iron ceiling panels made of lightweight steel are used as the base material for the ceiling, even if each light iron ceiling panel is supported by a suspension material on the beam, the restraint between each light iron ceiling panel is weak. When an impact is applied to the upper floor, the impact is transmitted to the light iron ceiling panel via the floor, beams and suspension materials, and each light iron ceiling panel oscillates separately, radiating sound to the lower floor. Resulting in.

本発明は、以上のような問題点に鑑み、天井の内装下地材としての天井パネルが設けられている建物において、上階からの床衝撃音の伝達を抑制することができる天井パネル制振構造を提供することを課題とする。   In view of the above problems, the present invention provides a ceiling panel damping structure capable of suppressing transmission of floor impact sound from an upper floor in a building provided with a ceiling panel as a ceiling interior base material. It is an issue to provide.

上記の課題は、建物の上階からの床衝撃音に対する防音性能向上を図る天井制振構造であって、天井の内装下地材としての天井パネルが、下階天井部に少なくとも２つ以上設けられ、該天井パネルどうしが拘束型制振材によって連結されており、天井パネル間の相対変位を拘束型制振材の剛性により拘束するとともに、拘束型制振材の変形により、天井パネル間の相対変位によるエネルギーを吸収することを特徴とする天井パネル制振構造により解決される。   The above-described problem is a ceiling vibration control structure that improves the soundproofing performance against floor impact sound from the upper floor of a building, and at least two or more ceiling panels are provided on the ceiling of the lower floor as a ceiling interior base material. The ceiling panels are connected by a constraining type damping material, and the relative displacement between the ceiling panels is constrained by the rigidity of the constraining type damping material. It is solved by a ceiling panel damping structure characterized by absorbing energy due to displacement.

本天井パネル制振構造では、下階天井部に少なくとも２つ以上設けられた天井の内装下地材としての天井パネルどうしが、拘束型制振材によって連結されているので、天井パネル間の相対変位を拘束型制振材の剛性により拘束することができ、それぞれの天井パネルどうしがばらばらに振動することを抑制でき、上階での衝撃による振動が下階へ伝わることを抑制することができる。また、それぞれの天井パネルを拘束型制振材により拘束することで、天井パネル単体では軽い部材であっても、隣り合う天井パネルどうしを連結することによって、天井パネル全体として大型の重量物とすることができ、上階で発生した床への衝撃による振動が天井パネルへと伝達することをさらに、抑制することができる。   In this ceiling panel damping structure, since the ceiling panels as the interior base material of the ceiling provided at least two or more in the lower floor ceiling part are connected by the restraining type damping material, the relative displacement between the ceiling panels Can be constrained by the rigidity of the constraining type damping material, so that the ceiling panels can be prevented from vibrating separately, and the vibration due to the impact on the upper floor can be prevented from being transmitted to the lower floor. In addition, by constraining each ceiling panel with a constrained vibration damping material, even if the ceiling panel alone is a light member, by connecting adjacent ceiling panels together, the ceiling panel as a whole becomes a large heavy object It is possible to further suppress the vibration due to the impact on the floor generated on the upper floor from being transmitted to the ceiling panel.

また、天井パネル間で発生する相対変位による運動エネルギーを、拘束型制振材の変形により熱エネルギーに変換することで、天井パネルの相対変位を抑制することができ、上階で発生した床への衝撃による振動が天井パネルへと伝達することをさらに、抑制することができる。   In addition, by converting the kinetic energy due to the relative displacement generated between the ceiling panels to thermal energy by deformation of the constrained damping material, the relative displacement of the ceiling panel can be suppressed, and the floor generated on the upper floor It is possible to further suppress the transmission of the vibration due to the impact to the ceiling panel.

つまり、本発明は、天井下地材としての天井パネルどうしを拘束型制振材により連結することにより、拘束型制振材の剛性により天井パネル間の相対変位を拘束するとともに、天井パネル間が相対変位した場合でも、拘束型制振材の制振機能により、その変位量を抑制することができる。   In other words, the present invention constrains the relative displacement between the ceiling panels by the rigidity of the constrained vibration damping material by connecting the ceiling panels as the ceiling base material by the constrained vibration damping material. Even in the case of displacement, the amount of displacement can be suppressed by the damping function of the constrained damping material.

上記の天井パネル制振構造において、天井パネルが鋼製であるとよい。   In the above ceiling panel damping structure, the ceiling panel may be made of steel.

天井パネルが鋼製である場合、特に天井パネルが軽量の鋼材からなる軽鉄天井パネルである場合、隣り合う天井パネルを釘やビス等で連結できる木製の天井パネルと異なり、隣り合う天井パネルどうしを一体的に連結することが困難であるにもかかわらず、拘束型制振材を用いて天井パネルどうしを連結することで天井パネルどうしを一体とすることができる。   When the ceiling panel is made of steel, especially when the ceiling panel is a light iron ceiling panel made of lightweight steel, the adjacent ceiling panels are different from each other, unlike wooden ceiling panels that can connect adjacent ceiling panels with nails or screws. Although it is difficult to integrally connect the ceiling panels, the ceiling panels can be integrated with each other by connecting the ceiling panels using a restrained vibration damping material.

さらに、拘束型制振材が、拘束層を形成する鋼板と制振材の２層構造からなっているとよい。   Furthermore, it is preferable that the constraining type damping material has a two-layer structure of a steel plate and a damping material that form a constraining layer.

鋼板と制振材からの２層構造という簡易な構造である拘束型制振材を用いてこの天井パネル制振構造が実現できるため、コスト的に有利に実現することができる。また、拘束型制振材の天井パネルへの取付けを制振材の粘着性によって実現する場合には、さらに拘束型制振材の天井パネルへの取り付けのために他の材料を用いる必要がなく、よりコスト的に有利に実現することができる。   Since this ceiling panel damping structure can be realized by using a constrained damping material that is a simple structure of a two-layer structure of a steel plate and a damping material, it can be advantageously realized in terms of cost. Moreover, when mounting the restraint type damping material to the ceiling panel is realized by the adhesiveness of the damping material, there is no need to use other materials for attaching the restraint type damping material to the ceiling panel. Can be realized more cost-effectively.

本発明は以上のとおりであるから、天井の内装下地材としての天井パネルが設けられている建物において、上階からの床衝撃音の伝達を抑制することができる天井パネル制振構造を実現することができる。   Since the present invention is as described above, a ceiling panel damping structure capable of suppressing transmission of floor impact sound from the upper floor is realized in a building provided with a ceiling panel as a ceiling interior base material. be able to.

図（イ）は、本発明の実施形態である天井パネルの制振構造を示す側面図、図（ロ）、（ハ）は、それぞれ、図（イ）のＡ−Ａ線断面正面図、Ｂ−Ｂ線断面正面図である。FIG. 1A is a side view showing a vibration damping structure for a ceiling panel according to an embodiment of the present invention. FIGS. 2B and 2C are cross-sectional front views along line AA in FIG. FIG. 図（イ）は、天井パネルの構成を示す平面図、図（ロ）は、図（イ）のＣ−Ｃ線断面正面図である。Fig. (A) is a plan view showing the configuration of the ceiling panel, and Fig. (B) is a cross-sectional front view taken along the line CC of Fig. (A). 図（イ）は、天井パネルを拘束型制振材で一体化した状態を示す平面図、図(ロ)は、拘束型制振材を示す断面図である。FIG. 1A is a plan view showing a state in which the ceiling panel is integrated with a constrained vibration damping material, and FIG. 2B is a cross-sectional view showing the constrained vibration damping material. 図（イ）、（ロ）は、上階から振動が伝わったときの、本制振構造の稼動状況を示す断面正面図である。FIGS. 1A and 1B are cross-sectional front views showing the operation status of the vibration damping structure when vibration is transmitted from the upper floor. 図（イ−１）、（イ−２）は、それぞれ、本発明の第２の実施形態である天井パネルの制振構造の断面正面図、拘束型制振材の断面図であり、図（ロ−１）、（ロ−２）は、それぞれ、本発明の第３の実施形態である天井パネルの制振構造の断面正面図、拘束型制振材の断面図である。FIGS. (A-1) and (A-2) are a cross-sectional front view of a vibration damping structure for a ceiling panel and a cross-sectional view of a constrained vibration damping material, respectively, according to a second embodiment of the present invention. (B-1) and (B-2) are a cross-sectional front view of a vibration damping structure for a ceiling panel and a cross-sectional view of a constrained vibration damping material, respectively, according to a third embodiment of the present invention.

次に、本発明の実施形態を図面に基づいて説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１に示す本発明の実施形態である天井パネルの制振構造１において、２は天井パネル、３は拘束型制振材、４は建物の２階床を支持する梁、５はＡＬＣ材からなる床材、６は床仕上げ材である。   In the ceiling panel damping structure 1 according to the embodiment of the present invention shown in FIG. 1, 2 is a ceiling panel, 3 is a restrained damping material, 4 is a beam supporting the second floor of a building, and 5 is an ALC material. The flooring material 6 is a floor finishing material.

天井パネル２は、図２に示すように、四周を断面コの字型の溝型薄鋼材を、溝部を内向きにして組み合わされ、内部には薄鋼材からなる縦材と横材が井桁状に組み込まれている。   As shown in FIG. 2, the ceiling panel 2 is formed by combining groove-shaped thin steel materials having a U-shaped cross section around the four sides with the groove portions facing inward, and vertical and horizontal members made of a thin steel material inside. Built in.

天井パネル２は、梁４‥に取り付けられた天井パネル吊治具７に、隣り合う天井パネル２，２どうしを半固定状態に連結して梁４‥に吊り下げて固定される。なお、天井パネル吊治具７は、図１（ロ）、（ハ）に示すように、天井パネル２の外周枠体に沿って、間隔を空けて設けられる。   The ceiling panel 2 is fixed to a ceiling panel suspension jig 7 attached to the beams 4... By connecting the adjacent ceiling panels 2 and 2 in a semi-fixed state and suspended from the beams 4. The ceiling panel hanging jig 7 is provided at intervals along the outer peripheral frame of the ceiling panel 2 as shown in FIGS.

天井パネル２‥の裏面には、図１（ロ）、図３（イ）に示すように、天井パネルの外周枠体どうしを連結するように拘束型制振材３が貼付されている。拘束型制振材３は、図３（ロ）に示すように、薄型鋼板３ａと制振材３ｂの２層からなる。制振材３ｂとして、例えばブチルゴム系の自己接着性のある材料が用いられ、制振材３の自己接着性機能により、薄型鋼板３ａと制振材３ｂが一体化されるとともに、天井パネル２と外周枠体に拘束型制振材３を固定することができる。   As shown in FIGS. 1 (b) and 3 (a), a constraining type damping material 3 is attached to the back surface of the ceiling panel 2 so as to connect the outer peripheral frames of the ceiling panel. As shown in FIG. 3B, the constrained vibration damping material 3 is composed of two layers of a thin steel plate 3a and a vibration damping material 3b. As the damping material 3b, for example, a butyl rubber self-adhesive material is used. By the self-adhesive function of the damping material 3, the thin steel plate 3a and the damping material 3b are integrated, and the ceiling panel 2 The restraint type damping material 3 can be fixed to the outer peripheral frame.

天井パネル２‥の表面には、天井材としての石膏ボード８が、隣り合う天井パネル２，２を連結するように、順次天井パネル２‥と石膏ボード８‥の取り付け位置をずらしながら貼られ、さらに天井仕上げ材としてクロス９が貼られている。また、天井パネル２，２は、天井パネル吊治具７によって、隣り合う天井パネル２どうしが半固定状態に連結されて梁４に吊り下げて固定されるとともに、表面には、石膏ボード８により連結されているが、天井パネル２，２どうしを拘束型制振材３により連結することにより、より一層天井パネル２どうしを拘束し一体化させることができる。   On the surface of the ceiling panel 2..., A gypsum board 8 as a ceiling material is attached while sequentially shifting the mounting positions of the ceiling panel 2 and the gypsum board 8 so as to connect the adjacent ceiling panels 2 and 2. Furthermore, a cloth 9 is pasted as a ceiling finishing material. In addition, the ceiling panels 2 and 2 are connected to each other by a ceiling panel hanging jig 7 so that the adjacent ceiling panels 2 are connected to each other in a semi-fixed state and are suspended and fixed to the beam 4. Although connected, by connecting the ceiling panels 2 and 2 with the restraining type damping material 3, the ceiling panels 2 can be further restrained and integrated.

図４に示すように、上階の床に衝撃が加わり、その振動が天井パネル２に伝わっても、天井パネル２どうしが、拘束型制振材３で連結されているため、上階からの衝撃に対して、隣り合う天井パネル２がそれぞればらばらに振動することが抑制でき、上階での衝撃による振動が下階へ伝わることを抑制することができる。また、それぞれの天井パネルを拘束型制振材により拘束することで、天井パネル全体として大型の重量物とすることができ、上階で発生した床への衝撃による振動が天井パネルへと伝達することをさらに、抑制することができる。   As shown in FIG. 4, even if an impact is applied to the floor of the upper floor and the vibration is transmitted to the ceiling panel 2, the ceiling panels 2 are connected by the restraint type damping material 3. It can suppress that the adjacent ceiling panel 2 vibrates separately with respect to an impact, and can suppress that the vibration by the impact on an upper floor is transmitted to a lower floor. In addition, by restraining each ceiling panel with restraint type damping material, the ceiling panel as a whole can be made into a heavy weight, and vibration due to the impact on the floor generated on the upper floor is transmitted to the ceiling panel. This can be further suppressed.

また、上階の床に衝撃が加わり、その振動が天井パネル２に伝わることで、隣り合う天井パネル２，２に相対的に変位する場合でも、天井パネル間で発生する相対変位による運動エネルギーを、拘束型制振材の変形により熱エネルギーに変換することで、天井パネルの相対変位を抑制することができ、上階で発生した床への衝撃による振動が天井パネルへと伝達することをさらに抑制することができる。   Further, even when the impact is applied to the upper floor and the vibration is transmitted to the ceiling panel 2, the kinetic energy due to the relative displacement generated between the ceiling panels can be reduced even if the relative displacement is caused between the adjacent ceiling panels 2 and 2. By converting to thermal energy by deformation of constrained damping material, it is possible to suppress the relative displacement of the ceiling panel, and further to transmit the vibration caused by the impact to the floor generated on the upper floor to the ceiling panel Can be suppressed.

図５（イ−１）、（イ−２）に示す本発明の第２の実施形態である天井パネルの制振構造２１では、拘束型制振材２３が、薄型鋼板２３ａの両面に制振材２３ｂ，２３ｂが貼付されて構成されており、天井パネル２，２の外周枠体の側面にそれぞれ制振材２３ｂ，２３ｂの自己接着性により取り付けられ、天井パネル２どうしが拘束型制振材２３により、一体化されている。   In the vibration damping structure 21 of the ceiling panel according to the second embodiment of the present invention shown in FIGS. 5 (A-1) and (A-2), the restraint type damping material 23 is damping on both surfaces of the thin steel plate 23a. The members 23b and 23b are attached, and are attached to the side surfaces of the outer peripheral frames of the ceiling panels 2 and 2 by the self-adhesiveness of the vibration damping materials 23b and 23b, respectively. 23 is integrated.

また、図５（ロ−１）、（ロ−２）に示す本発明の第３の実施形態である天井パネルの制振構造３１では、拘束型制振材３３が、ベース部とベース部から突出する挿設部からなる断面視Ｔ字型の薄型鋼材３３ａのベース部と挿設部により構成されるコーナー部にそれぞれ制振材３３ｂ，３３ｂがＬ字状に貼付されて構成されており、天井パネル２，２の外周枠体の側面に挿設部を挿入させ、外周枠体の角部を覆うように、それぞれ制振材３３ｂ，３３ｂの自己接着性により取り付けられ、天井パネル２どうしが拘束型制振材３３により、一体化されている。   Further, in the vibration damping structure 31 of the ceiling panel according to the third embodiment of the present invention shown in FIGS. 5 (B-1) and (B-2), the restraint type damping material 33 is formed from the base part and the base part. Damping materials 33b and 33b are respectively attached to the corner portion constituted by the base portion and the insertion portion of the T-shaped thin steel material 33a having a protruding insertion portion and formed in an L shape, The insertion parts are inserted into the side surfaces of the outer peripheral frame bodies of the ceiling panels 2 and 2 and are attached by the self-adhesiveness of the vibration damping materials 33b and 33b so as to cover the corners of the outer peripheral frame bodies. The restraint type damping material 33 is integrated.

天井パネルの制振構造２１，３１ともに、天井パネル２，２どうしを拘束型制振材３により連結することにより、天井パネル２どうしを拘束し一体化させることができ、上階からの衝撃に対して、隣り合う天井パネル２がそれぞればらばらに振動することが抑制でき、さらに、隣り合う天井パネル２，２に相対的に変位する場合でも、天井パネル間で発生する相対変位による運動エネルギーを、拘束型制振材の変形により熱エネルギーに変換することで、天井パネルの相対変位を抑制することができ、上階で発生した床への衝撃による振動が天井パネルへと伝達することをさらに、抑制することができる。   By connecting the ceiling panels 2 and 2 with the restraining type damping material 3 together with the vibration control structures 21 and 31 of the ceiling panel, the ceiling panels 2 can be constrained and integrated with each other. On the other hand, the adjacent ceiling panels 2 can be restrained from vibrating separately, and even when the adjacent ceiling panels 2 and 2 are relatively displaced, the kinetic energy due to the relative displacement generated between the ceiling panels is By converting to thermal energy by deformation of the constrained damping material, it is possible to suppress the relative displacement of the ceiling panel, and further that the vibration caused by the impact on the floor generated on the upper floor is transmitted to the ceiling panel. Can be suppressed.

以上に、本発明の実施形態を示したが、本発明はこれに限られるものではなく、発明思想を逸脱しない範囲で各種の変更が可能である。例えば、上記の実施形態では、鋼製の天井パネルに適用した場合について示したが、相互にビスや釘等により連結される木製の天井パネルに適用し、より強固に天井パネルを一体化するとともに、天井パネルどうしの相対変位による運動エネルギーを熱エネルギーに変換し、天井パネルの相対変位を抑制するようにしてもよい。   Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the case where the present invention is applied to a steel ceiling panel has been described. However, the present invention is applied to wooden ceiling panels that are connected to each other by screws, nails, etc., and the ceiling panel is more firmly integrated. The kinetic energy due to the relative displacement between the ceiling panels may be converted into thermal energy so as to suppress the relative displacement of the ceiling panels.

１，２１，３１・・・天井パネルの制振構造
２・・・天井パネル
３，２３，３３・・・拘束型制振材
３ａ，２３ａ，３３ａ・・・薄型鋼板（薄型鋼材）
３ｂ，２３ｂ，３３ｂ・・・制振材
４・・・梁
５・・・床材
６・・・床仕上げ材
７・・・天井パネル吊治具
８・・・石膏ボード
９・・・クロス 1, 21, 31 ... Damping structure of ceiling panel 2 ... Ceiling panel 3, 23, 33 ... Restraint type damping material 3a, 23a, 33a ... Thin steel plate (thin steel material)
3b, 23b, 33b ... Damping material 4 ... Beam 5 ... Floor material 6 ... Floor finishing material 7 ... Ceiling panel hanging jig 8 ... Gypsum board 9 ... Cross

Claims (3)

建物の上階からの床衝撃音に対する防音性能向上を図る天井制振構造であって、
天井の内装下地材としての天井パネルが、下階天井部に少なくとも２つ以上設けられ、
該天井パネルどうしが拘束型制振材によって連結されており、
天井パネル間の相対変位を拘束型制振材の剛性により拘束するとともに、
拘束型制振材の変形により、天井パネル間の相対変位によるエネルギーを吸収することを特徴とする天井パネル制振構造。 A ceiling vibration control structure that improves the soundproof performance against floor impact sound from the upper floor of the building,
At least two ceiling panels as interior base materials for the ceiling are provided on the lower floor ceiling,
The ceiling panels are connected by a restraining type damping material,
While restraining the relative displacement between the ceiling panels by the rigidity of the restraint type damping material,
A ceiling panel damping structure that absorbs energy due to relative displacement between ceiling panels by deformation of a constrained damping material. 前記天井パネルが鋼製である請求項１に記載の天井パネル制振構造。   The ceiling panel damping structure according to claim 1, wherein the ceiling panel is made of steel. 前記拘束型制振材が、拘束層を形成する鋼板と制振材の２層構造からなる請求項１乃至２に記載の天井パネル制振構造。   The ceiling panel damping structure according to claim 1, wherein the constrained vibration damping material has a two-layer structure of a steel plate and a vibration damping material forming a constraining layer.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013147871A (en) * 2012-01-20 2013-08-01 Daiwa House Industry Co Ltd Sound insulation ceiling structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08302829A (en) * 1995-03-09 1996-11-19 Sekisui Chem Co Ltd Vibration control structure for unit building
JP2009270286A (en) * 2008-05-01 2009-11-19 Hayakawa Rubber Co Ltd Ceiling structure and its construction method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08302829A (en) * 1995-03-09 1996-11-19 Sekisui Chem Co Ltd Vibration control structure for unit building
JP2009270286A (en) * 2008-05-01 2009-11-19 Hayakawa Rubber Co Ltd Ceiling structure and its construction method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013147871A (en) * 2012-01-20 2013-08-01 Daiwa House Industry Co Ltd Sound insulation ceiling structure

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