JP5636027B2 - Sound insulating veranda structure - Google Patents

Sound insulating veranda structure Download PDF

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JP5636027B2
JP5636027B2 JP2012174155A JP2012174155A JP5636027B2 JP 5636027 B2 JP5636027 B2 JP 5636027B2 JP 2012174155 A JP2012174155 A JP 2012174155A JP 2012174155 A JP2012174155 A JP 2012174155A JP 5636027 B2 JP5636027 B2 JP 5636027B2
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veranda
noise
sound
reflector
sound insulating
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JP2012211509A (en
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崇 石塚
崇 石塚
宮島　徹
徹 宮島
中川　清
清 中川
藤原　恭司
恭司 藤原
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Kyushu University NUC
Shimizu Corp
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Shimizu Corp
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Description

本発明は、集合住宅やオフィスビル等の建築物における室内の静音性を保つためのベランダ構造であって、屋外騒音に対して遮音性能を有する遮音性ベランダ構造に関するものである。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veranda structure for maintaining the quietness of a room in a building such as an apartment house or an office building, and relates to a sound insulation veranda structure having a sound insulation performance against outdoor noise.

近年、幹線道路・鉄道に近接して高層あるいは超高層の集合住宅やオフィスビルが建設されるケースが多くなってきている。これは、駅周辺の大規模再開発や、従来このような立地にあった工場・倉庫等の郊外への移転等が背景にあり、建設用地の調達や利便性の確保といった面から、今後もこうした傾向は続くと考えられている。   In recent years, high-rise or super-high-rise apartment buildings and office buildings are being built near main roads and railways. This is due to the large-scale redevelopment around the station and the relocation of factories and warehouses that were previously located to the suburbs. This trend is expected to continue.

幹線道路・鉄道は騒音源となることから、幹線道路・鉄道に極めて近い距離に立地する建築物内部には、外壁面から窓サッシ等を介して騒音が伝搬しやすく、建築物内部における静音性を保つことが難しい。一方で、居住環境や労働環境に対する意識の高まりから、居室内や執務空間における高度の静穏化が要求されている。   Since main roads and railways are noise sources, noise can easily propagate from outside walls through window sashes, etc., to the interior of buildings located very close to main roads and railways. Difficult to keep. On the other hand, due to the growing awareness of the living environment and working environment, a high degree of calming is required in the living room and office space.

このような屋外騒音を低減または遮断する従来の一般的な対策として、高気密サッシや二重サッシなどの防音窓による対策が採られる。しかしながら、こうした窓サッシの高遮音化には限界がある上、重量の大きいサッシや二重サッシは利便性に劣るといった問題がある。   As a conventional general measure for reducing or blocking such outdoor noise, a measure using a soundproof window such as a highly airtight sash or a double sash is adopted. However, there is a limit to the increase in sound insulation of such a window sash, and there is a problem that a heavy sash or a double sash is not convenient.

建築物がベランダを有する場合には、屋外騒音はベランダを介して窓サッシから建築物内部に伝搬する。ベランダの手摺りをコンクリートあるいは板状の樹脂等で構成して、屋外の騒音源から窓開口に直接伝搬する騒音を遮蔽する対策が一般的に採られる。しかしながら、図８および図９に示すように、手摺り上方の開口から伝搬する騒音や、手摺り上端で音波が回り込むことによる回折した騒音がベランダ天井面で反射して、あるいはベランダ内で乱反射して窓開口に入射するため、大きな騒音低減効果は期待できない。   When the building has a veranda, outdoor noise propagates from the window sash to the inside of the building through the veranda. Generally, a countermeasure is adopted in which the railing of the veranda is made of concrete or plate-like resin, and the noise directly propagating from the outdoor noise source to the window opening is shielded. However, as shown in FIGS. 8 and 9, noise propagating from the opening above the handrail and diffracted noise caused by sound waves wrapping around the upper end of the handrail are reflected from the ceiling surface of the veranda or diffusely reflected in the veranda. Therefore, a large noise reduction effect cannot be expected.

そこで、ベランダ天井面で反射して窓開口に入射する騒音の対策として、天井面で騒音を屋外側へ反射するために、ベランダ天井面を屋外側へ傾斜させた構造や、鋸状断面の反射体を天井面に取り付けた構造が提案されている（例えば、特許文献１および特許文献２参照）。また、ベランダ天井面に吸音材を設けることで、窓開口へ反射する騒音を低減する構造が知られている（例えば、特許文献３および特許文献４参照）。特許文献３では、ベランダ手摺り上端に吸音材を取り付けることで屋外から伝搬する騒音を低減する構造が提案されている。   Therefore, as a countermeasure against noise reflected on the veranda ceiling surface and entering the window opening, in order to reflect noise to the outdoor side on the ceiling surface, the veranda ceiling surface is inclined to the outdoor side, or the reflection of the saw-shaped cross section The structure which attached the body to the ceiling surface is proposed (for example, refer patent document 1 and patent document 2). Moreover, the structure which reduces the noise reflected to a window opening by providing a sound-absorbing material in a veranda ceiling surface is known (for example, refer patent document 3 and patent document 4). In patent document 3, the structure which reduces the noise propagated from the outdoors by attaching a sound-absorbing material to the upper end of a veranda handrail is proposed.

特開２００４−１６２２７４号公報JP 2004-162274 A 特開２００６−２６５８３９号公報JP 2006-265839 A 特開２００３−４１６８０号公報JP 2003-41680 A 特開２００２−３３２７０１号公報JP 2002-332701 A 「日本音響学会道路交通騒音予測モデル“ＡＳＪ ＲＴＮ−Ｍｏｄｅｌ ２００３”」、社団法人日本音響学会 道路交通騒音調査研究委員会、日本音響学会誌第６０巻４号、２００４年“The Acoustical Society of Japan Road Traffic Noise Prediction Model“ ASJ RTN-Model 2003 ””, The Acoustical Society of Japan Road Traffic Noise Research Committee, Journal of the Acoustical Society of Japan, Vol. 60, No. 4, 2004

ところで、屋外からベランダ内に伝搬する騒音は、図８および図９に示すように、屋外の騒音源からベランダ手摺り上方の開口を直接通過して伝搬する騒音（直接波）と、ベランダ手摺り上端で回折して伝搬する騒音（回折波）とに区別することができる。   By the way, as shown in FIGS. 8 and 9, the noise propagating from the outside to the inside of the veranda is directly transmitted through the opening above the veranda handrail from the noise source (direct wave) and the veranda handrail. It can be distinguished from noise (diffracted wave) diffracted and propagated at the upper end.

この場合、上記の従来の特許文献１等のベランダ天井面に反射体を備える構造では、直接波や回折波による騒音を屋外へ確実に反射させなければベランダ内（天井面、床面、手摺りのベランダ内側の面）で再反射した騒音が窓開口を介して居室内に伝搬することとなる。特に、回折音波はベランダ手摺り上端から放射状に伝搬することから、上記の従来の特許文献１等のベランダ天井面の反射体でこの放射状の音波を屋外へ確実に反射させることは難しい。   In this case, in the structure provided with the reflector on the veranda ceiling surface of the above-mentioned conventional patent document 1 or the like, unless the noise due to the direct wave or the diffracted wave is reliably reflected outdoors, the inside of the veranda (ceiling surface, floor surface, handrail) The noise re-reflected on the inner surface of the veranda propagates into the living room through the window opening. In particular, since the diffracted sound wave propagates radially from the upper end of the veranda handrail, it is difficult to reliably reflect this radial sound wave outdoors with the reflector on the veranda ceiling surface of the above-mentioned conventional patent document 1 or the like.

また、上記の従来の特許文献３や特許文献４に示される天井面や手摺り上端に吸音材を用いた構造では、吸音材の汚れや吸音材の破損片の飛散、経年変化による吸音性能の劣化といった問題があり、維持管理の手間やコストが生じる。さらに、一般的に用いられる多孔質性吸音材は、低周波数域における吸音効果が低いといった効果の周波数依存性がある。   Moreover, in the structure using the sound absorbing material on the ceiling surface and the upper end of the handrail shown in the above-mentioned conventional Patent Document 3 and Patent Document 4, the sound absorbing performance of the sound absorbing material is scattered, the sound absorbing material is scattered, and the sound absorbing performance is deteriorated over time. There is a problem of deterioration, and maintenance work and costs are generated. Furthermore, the porous sound-absorbing material that is generally used has a frequency dependency of an effect that the sound-absorbing effect in a low frequency range is low.

本発明は、上記実情に鑑みてなされたものであり、建物近傍の主要な騒音源からベランダ天井面に入射する屋外騒音をより確実に屋外へ反射することができ、窓から居室内へ伝搬する屋外騒音を低減することができる遮音性ベランダ構造を提供することを目的とする。   The present invention has been made in view of the above circumstances, and can more reliably reflect outdoor noise incident on a veranda ceiling surface from a main noise source in the vicinity of a building and propagate it from a window to a living room. An object of the present invention is to provide a sound-insulating veranda structure that can reduce outdoor noise.

上記の目的を達成するために、本発明の請求項１に係る遮音性ベランダ構造は、建物の外側に設けられるベランダ構造であって、前記ベランダ構造の斜め下方の前記建物に近接する騒音源から騒音が直接入射する領域のベランダ天井面に対してのみ配置され、入射した前記騒音の音波を反射する第１反射面を備え、前記騒音の直接波の伝搬方向に対する前記第１反射面の傾斜角度を９０度以上に設定したことを特徴とする。 In order to achieve the above object, a sound insulating veranda structure according to claim 1 of the present invention is a veranda structure provided outside a building , from a noise source adjacent to the building diagonally below the veranda structure. An inclination angle of the first reflection surface with respect to a direction of propagation of the noise direct wave, the first reflection surface disposed only on the veranda ceiling surface of the area where noise is directly incident, and reflecting the sound wave of the incident noise the is characterized in that is set more than 90 degrees.

また、本発明の請求項２に係る遮音性ベランダ構造は、上述した請求項１において、前記ベランダ構造に設置されたベランダ手摺りによる前記騒音の回折波を反射する第２反射面を前記ベランダ構造のベランダ天井面にさらに備え、前記第２反射面を、側面視で凹弧状に設定したことを特徴とする。 According to a second aspect of the present invention, there is provided a sound insulating veranda structure according to the first aspect described above, wherein the second reflecting surface that reflects the diffracted wave of the noise caused by the handrail of the veranda installed in the veranda structure is the veranda structure. further comprising the balcony ceiling surface of the second reflecting surface, and wherein the set to a concave arc shape in a side view.

また、本発明の請求項３に係る遮音性ベランダ構造は、上述した請求項２において、前記第２反射面を、前記ベランダ手摺りの端部を中心とする円弧状に設定したことを特徴とする。   The sound insulating veranda structure according to claim 3 of the present invention is characterized in that, in the above-described claim 2, the second reflecting surface is set in an arc shape centering on an end of the veranda handrail. To do.

また、本発明の請求項４に係る遮音性ベランダ構造は、上述した請求項２において、前記第２反射面を、前記ベランダ手摺りの上端およびそれより屋外側の１点を焦点とする楕円弧状に設定したことを特徴とする。   According to a fourth aspect of the present invention, there is provided a sound insulating veranda structure according to the second aspect described above, wherein the second reflecting surface is an elliptical arc having a focal point at the upper end of the veranda handrail and one point on the outdoor side. It is characterized by being set to.

また、本発明の請求項５に係る遮音性ベランダ構造は、上述した請求項１から請求項４のいずれか一つにおいて、前記ベランダ構造に設置されたベランダ手摺りは、屋外側に延出する板状の遮音部材を有することを特徴とする。 According to a fifth aspect of the present invention, in the sound insulating veranda structure according to any one of the first to fourth aspects, the veranda handrail installed on the veranda structure extends to the outdoor side. It has a plate-like sound insulation member.

また、本発明の請求項６に係る遮音性ベランダ構造は、上述した請求項１から請求項５のいずれか一つにおいて、前記第１反射面は反射体の屋外側側面に設けられ、前記反射体の屋内側側面の傾斜角度を、前記騒音の直接波の伝搬方向に合わせたことを特徴とする。   According to a sixth aspect of the present invention, there is provided the sound insulating veranda structure according to any one of the first to fifth aspects, wherein the first reflecting surface is provided on an outdoor side surface of the reflector, and the reflecting The inclination angle of the indoor side surface of the body is matched with the propagation direction of the direct wave of the noise.

本発明によれば、建物外部の騒音を反射する第１反射面をベランダ天井面に備え、騒音の直接波の伝搬方向に対する第１反射面の傾斜角度を９０度以上に設定し、前記第１反射面を、前記騒音の主な成分が直接入射する領域の前記ベランダ天井面に対してのみ備えたので、第１反射面に入射する騒音の直接波は騒音源または屋外に向かって反射される。このように、ベランダ天井面に入射する屋外騒音をより確実に屋外へ反射することができるので、ベランダを通過して窓から居室内へ伝搬する屋外騒音を低減することができる。したがって、建物内部の居室内の静音性を保持することができる。しかも、この騒音低減効果は、ベランダの天井高と居室内からの眺望を確保したまま実現することができる。   According to the present invention, the first reflecting surface for reflecting the noise outside the building is provided on the veranda ceiling surface, the inclination angle of the first reflecting surface with respect to the direction of propagation of the direct noise wave is set to 90 degrees or more, and the first Since the reflecting surface is provided only for the veranda ceiling surface in the region where the main component of the noise is directly incident, the direct wave of noise incident on the first reflecting surface is reflected toward the noise source or outdoors. . Thus, since the outdoor noise which injects into a veranda ceiling surface can be reflected more reliably to the outdoors, the outdoor noise which passes a veranda and propagates from a window to a living room can be reduced. Therefore, the quietness of the living room inside the building can be maintained. Moreover, this noise reduction effect can be realized while ensuring the ceiling height of the veranda and the view from the living room.

また、本発明では吸音材を用いないので、吸音材やベランダに対する維持管理を要することなく上記効果を得ることができる。さらに、本発明によれば、窓開口に一重サッシを用いることで、本発明を適用せずに二重サッシを用いた場合とほぼ同等の屋外騒音に対する遮音性能を実現することができる。このように、二重サッシを用いないことにより、窓サッシの利便性の向上と設計上の自由度とを得ることができる。   In addition, since the sound absorbing material is not used in the present invention, the above effect can be obtained without requiring maintenance management for the sound absorbing material and the veranda. Furthermore, according to the present invention, by using a single sash for the window opening, it is possible to realize a sound insulation performance with respect to outdoor noise substantially equivalent to the case of using a double sash without applying the present invention. Thus, by not using the double sash, it is possible to improve the convenience of the window sash and the degree of design freedom.

図１は、本発明に係る実施例１の遮音性ベランダ構造の側断面図である。1 is a side sectional view of a sound insulating veranda structure according to a first embodiment of the present invention. 図２は、本発明に係る実施例２の遮音性ベランダ構造の側断面図である。FIG. 2 is a side sectional view of the sound insulating veranda structure of Example 2 according to the present invention. 図３は、本発明に係る実施例３の遮音性ベランダ構造の側断面図である。FIG. 3 is a side sectional view of the sound insulating veranda structure of Example 3 according to the present invention. 図４は、本発明に係る実施例４の遮音性ベランダ構造の側断面図である。FIG. 4 is a sectional side view of the sound insulating veranda structure of Example 4 according to the present invention. 図５は、本発明に係る実施例５の遮音性ベランダ構造の側断面図である。FIG. 5 is a side sectional view of the sound insulating veranda structure of Example 5 according to the present invention. 図６は、数値解析結果による実施例１〜５の騒音低減効果の周波数特性図である。FIG. 6 is a frequency characteristic diagram of the noise reduction effect of Examples 1 to 5 based on the numerical analysis results. 図７は、数値解析結果による実施例１〜５のＡ特性音圧レベルの騒音低減効果を示す図である。FIG. 7 is a diagram illustrating the noise reduction effect of the A characteristic sound pressure level in Examples 1 to 5 based on the numerical analysis results. 図８は、従来の建築物近傍の騒音源から建築物外壁面に入射する騒音の伝搬状況を示す側断面図である。FIG. 8 is a side sectional view showing a state of propagation of noise incident on a building outer wall surface from a conventional noise source in the vicinity of the building. 図９は、従来のベランダに入射する騒音の伝搬状況を示す側断面図であり、図８の部分拡大図である。FIG. 9 is a side sectional view showing a state of propagation of noise incident on a conventional veranda, and is a partially enlarged view of FIG.

以下に添付図面を参照しながら、本発明に係る遮音性ベランダ構造の好適な実施の形態（実施例１〜５）を詳細に説明する。図１〜５は、本発明に係る遮音性ベランダ構造の側断面図であり、道路・鉄道（騒音源）からの騒音伝搬を模式的に示した図である。図中、ベランダ手摺りや天井面、床面で反射した騒音の波面は省略している。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments (Examples 1 to 5) of a sound insulating veranda structure according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 are side sectional views of a sound insulating veranda structure according to the present invention, and are diagrams schematically showing noise propagation from a road / railway (noise source). In the figure, the wavefront of the noise reflected from the veranda handrail, the ceiling surface, and the floor surface is omitted.

図１に示すように、本発明に係る遮音性ベランダ構造１００は、ベランダ天井面１２と床面１４と居室１６の窓開口１８とを有し、側断面視で略コの字状に形成されている。ベランダ屋外２２側には、床面１４から上方に延びる板状のベランダ手摺り２４が設置されてある。遮音性ベランダ構造１００は、図８に示すように、高層建築物の外側の各階にそれぞれ設けられ、建築物の斜め下方には騒音源となる道路・鉄道が通っている。   As shown in FIG. 1, a sound insulating veranda structure 100 according to the present invention has a veranda ceiling surface 12, a floor surface 14, and a window opening 18 of a living room 16, and is formed in a substantially U shape in a side sectional view. ing. A plate-like veranda handrail 24 extending upward from the floor surface 14 is installed on the veranda outdoor 22 side. As shown in FIG. 8, the sound insulating veranda structure 100 is provided on each floor outside the high-rise building, and a road / railway that is a noise source passes diagonally below the building.

建築物の中層階あるいは高層階においては、騒音源からある程度離れているため、騒音の直接波は平面波とみなすことができ、ベランダへの直接波の入射角度θ（水平線とのなす角度）は、騒音源との位置関係により一意に決まる。また、ベランダ手摺り２４に隠れて騒音源が直接見通せない領域においては、回折波がベランダ手摺り上端２６（回折点）から放射状にベランダ内に伝搬する。
道路や鉄道が建築物近傍にある場合、これら道路や鉄道から発生する騒音が建築物外壁面に入射する騒音の主な成分とみなすことができる。 On the middle floor or high floor of the building, since it is far away from the noise source, the direct wave of noise can be regarded as a plane wave, and the incident angle θ of the direct wave to the veranda (angle formed with the horizontal line) is It is uniquely determined by the positional relationship with the noise source. Further, in an area where the noise source cannot be directly seen due to being hidden by the veranda handrail 24, the diffracted wave propagates radially into the veranda from the upper end 26 (diffraction point) of the veranda handrail.
When a road or railway is in the vicinity of a building, noise generated from the road or railway can be regarded as a main component of noise incident on the outer wall surface of the building.

（実施例１）
まず、実施例１について説明する。図１は、実施例１を示す側断面図である。
図１に示すように、実施例１の遮音性ベランダ構造１００は、騒音源から騒音が直接入射する領域の天井面１２に対して配置される反射体１を備える。反射体１は、騒音の直接波の伝搬方向に対する傾斜角度θａが９０度ないし９０度以上となる第１反射面１０を有する。ここで、第１反射面１０は、騒音の主な成分が直接入射する領域の天井面１２に対してのみ配置される。反射体１に入射した騒音の音波は第１反射面１０で反射してその伝搬方向は反転して騒音源または屋外の方向に進むので、ベランダ内に侵入しない。このため、騒音の直接波はより確実に屋外に反射される。 Example 1
First, Example 1 will be described. FIG. 1 is a side sectional view showing the first embodiment.
As shown in FIG. 1, the sound insulating veranda structure 100 of Example 1 is provided with the reflector 1 arrange | positioned with respect to the ceiling surface 12 of the area | region where a noise directly injects from a noise source. The reflector 1 has a first reflecting surface 10 having an inclination angle θa of 90 degrees to 90 degrees or more with respect to the propagation direction of the direct wave of noise. Here, the 1st reflective surface 10 is arrange | positioned only with respect to the ceiling surface 12 of the area | region into which the main component of noise injects directly. The sound wave of noise incident on the reflector 1 is reflected by the first reflecting surface 10 and its propagation direction is reversed and proceeds in the direction of the noise source or outdoors, so that it does not enter the veranda. For this reason, the direct wave of noise is more reliably reflected outdoors.

（実施例２）
次に、実施例２について説明する。図２は、実施例２を示す側断面図である。
図２に示すように、実施例２の遮音性ベランダ構造２００は、反射体１と、回折波が入射する領域の天井面１２に対して配置される反射体２とを備える。反射体２は、側断面視で回折点Ｃ（ベランダ手摺り上端２６）を円の中心とする凹円弧状の第２反射面２０を有する。反射体２の反射面形状は直線を組み合わせて円弧を近似した形状としても良い。反射体２は反射体１よりも居室１６側に配置し、反射体１の居室１６側の傾斜面１ａは直接波の伝搬方向と平行にして、反射体２と接続する。手摺り上端２６からベランダ天井面１２側に進む回折波は、反射体２の凹円弧状の第２反射面２０によって円弧の中心すなわち回折点Ｃに向けて確実に反射される。 (Example 2)
Next, Example 2 will be described. FIG. 2 is a side sectional view showing the second embodiment.
As shown in FIG. 2, the sound insulating veranda structure 200 according to the second embodiment includes the reflector 1 and the reflector 2 arranged with respect to the ceiling surface 12 in the region where the diffracted wave is incident. The reflector 2 has a concave arc-shaped second reflecting surface 20 having the diffraction point C (the veranda handrail upper end 26) as the center of the circle in a side sectional view. The reflection surface shape of the reflector 2 may be a shape that approximates an arc by combining straight lines. The reflector 2 is disposed closer to the living room 16 than the reflector 1, and the inclined surface 1a on the living room 16 side of the reflector 1 is connected to the reflector 2 in parallel with the direct wave propagation direction. The diffracted wave traveling from the handrail upper end 26 to the veranda ceiling surface 12 side is reliably reflected toward the center of the arc, that is, the diffraction point C by the concave arc-shaped second reflecting surface 20 of the reflector 2.

（実施例３）
次に、実施例３について説明する。図３は、実施例３を示す側断面図である。
図３に示すように、実施例３の遮音性ベランダ構造３００は、反射体１と、ベランダ手摺り上端２６から屋外２２側に略水平に延出した遮音部材としての遮音板３とを備える。この場合、遮音板３により直接波がベランダ内に入射する領域が狭まるので、反射体１を小型化することができる。 Example 3
Next, Example 3 will be described. FIG. 3 is a side sectional view showing the third embodiment.
As shown in FIG. 3, the sound insulating veranda structure 300 according to the third embodiment includes the reflector 1 and a sound insulating plate 3 as a sound insulating member extending substantially horizontally from the upper end 26 of the veranda handrail to the outdoor 22 side. In this case, since the area where the direct wave enters the veranda is narrowed by the sound insulating plate 3, the reflector 1 can be miniaturized.

（実施例４）
次に、実施例４について説明する。図４は、実施例４を示す側断面図である。
図４に示すように、実施例４の遮音性ベランダ構造４００は、反射体１と反射体２と遮音板３とを有する。この場合、遮音板３の屋外２２側の端点が回折点Ｃになるため、反射体２の第２反射面２０は、遮音板３の屋外２２側の端点を中心とする側断面視で凹円弧状の曲面となる。 Example 4
Next, Example 4 will be described. FIG. 4 is a side sectional view showing the fourth embodiment.
As shown in FIG. 4, the sound insulating veranda structure 400 of Example 4 includes a reflector 1, a reflector 2, and a sound insulating plate 3. In this case, since the end point on the outdoor 22 side of the sound insulating plate 3 is the diffraction point C, the second reflecting surface 20 of the reflector 2 is a concave circle in a side sectional view centering on the end point on the outdoor 22 side of the sound insulating plate 3. It becomes an arcuate curved surface.

（実施例５）
次に、実施例５について説明する。図５は、実施例５を示す側断面図である。
図５に示すように、実施例５の遮音性ベランダ構造５００は、反射体１と、ベランダの奥行き方向（図５における左右方向）に複数に分割した反射体２と、遮音板３とを有する。分割した反射体２の居室１６側の傾斜面２ａはその延長直線が円弧の中心Ｃを通るようにして、互いに接続する。この場合、反射体１および反射体２を小型化することにより、騒音低減作用を維持しつつ、ベランダの天井高の確保と居室内からの眺望の確保とを実現することができる。 (Example 5)
Next, Example 5 will be described. FIG. 5 is a side sectional view showing the fifth embodiment.
As shown in FIG. 5, the sound insulating veranda structure 500 of Example 5 includes a reflector 1, a reflector 2 that is divided into a plurality of portions in the depth direction of the veranda (left and right direction in FIG. 5), and a sound insulating plate 3. . The inclined surfaces 2a on the side of the living room 16 of the divided reflectors 2 are connected to each other so that the extended straight line passes through the center C of the arc. In this case, by reducing the size of the reflector 1 and the reflector 2, it is possible to secure the ceiling height of the veranda and the view from the living room while maintaining the noise reduction effect.

上記の実施例１〜５において、反射体１および反射体２は、低減対象の騒音に対して十分な反射性能を有していればどのような材質で構成してもよい。
反射体２は、ベランダ手摺り上端を中心とする円弧が最も効果が高いが、ベランダ手摺り上端およびそれより屋外側の１点を焦点とする楕円弧状の形状でもよい。また、直線を組み合わせてなる上記円弧あるいは楕円弧を近似した形状でもよい。 In the first to fifth embodiments, the reflector 1 and the reflector 2 may be made of any material as long as the reflector 1 and the reflector 2 have sufficient reflection performance with respect to noise to be reduced.
The reflector 2 is most effective when it has an arc centered at the upper end of the veranda handrail, but may have an elliptical arc shape with the upper end of the veranda handrail and one point on the outdoor side as a focal point. Moreover, the shape which approximated the said circular arc or elliptical arc which combined a straight line may be sufficient.

次に、本発明の効果を検証するために行った数値解析結果について説明する。
解析は、実施例１〜５の側断面を持つベランダが無限に連なっていると仮定して、２次元音響数値解析により行い、開放された窓開口１８から居室１６内に伝搬する騒音のエネルギーレベルを求めた。直接波の入射角度θは６０度とし、反射体１の第１反射面１０の傾斜角度θａは９０度とした。 Next, the results of numerical analysis performed to verify the effect of the present invention will be described.
The analysis is performed by two-dimensional acoustic numerical analysis on the assumption that the verandas having the side cross sections of Examples 1 to 5 are infinitely connected, and the energy level of noise propagating from the opened window opening 18 into the living room 16 Asked. The incident angle θ of the direct wave was 60 degrees, and the inclination angle θa of the first reflecting surface 10 of the reflector 1 was 90 degrees.

図６は、数値解析による実施例１〜５の騒音低減効果の周波数特性（１／３オクターブバンドレベル）であり、標準型ベランダ（反射体１、反射体２および遮音板３を有さないベランダ）に対する居室１６内に伝搬する騒音エネルギーレベルの低減量を示した図である。   FIG. 6 is a frequency characteristic (1/3 octave band level) of the noise reduction effect of Examples 1 to 5 by numerical analysis, and a standard veranda (a veranda without the reflector 1, the reflector 2, and the sound insulating plate 3). It is the figure which showed the reduction amount of the noise energy level which propagates in the living room 16 with respect to).

図６に示すように、騒音低減効果は、おおむね２００Ｈｚ以上の周波数で得られ、周波数が高いほど大きくなる。   As shown in FIG. 6, the noise reduction effect is generally obtained at a frequency of 200 Hz or higher, and increases as the frequency increases.

図７は、騒音源として自動車騒音を想定した場合のＡ特性音圧レベルにおける騒音低減効果を示した図であり、上記の標準型ベランダに対する居室内に伝搬する騒音エネルギーレベルの低減量を示した図である。図７において、Ａ特性音圧レベルは、１／３オクターブバンドレベルを非特許文献１に示される日本音響学会道路交通騒音予測モデルに基づく自動車騒音の周波数特性による重み付けおよびＡ特性補正を行い、それらをエネルギー合成して求めたものである。   FIG. 7 is a diagram showing the noise reduction effect at the A characteristic sound pressure level when automobile noise is assumed as a noise source, and shows the reduction amount of the noise energy level propagating into the room with respect to the standard veranda. FIG. In FIG. 7, the A characteristic sound pressure level is weighted by the frequency characteristic of automobile noise based on the 1/3 octave band level based on the Acoustical Society road traffic noise prediction model shown in Non-Patent Document 1, and the A characteristic is corrected. Is obtained by energy synthesis.

図７に示すように、実施例１、３の反射体１による騒音低減効果はＡ特性音圧レベルで７ｄＢＡ程度得られる。実施例２、４および５の反射体１に反射体２を組み合わせた構成では、騒音低減効果はＡ特性音圧レベルで１０ｄＢＡ程度得られる。実施例１と３の比較および実施例２と４の比較によれば、遮音板３を設置して、反射体１を小型化しても騒音低減効果はほぼ変わらない。実施例４と５の比較によれば、反射体２を分割しても騒音低減効果はほぼ変わらない。   As shown in FIG. 7, the noise reduction effect by the reflector 1 of Examples 1 and 3 can be obtained about 7 dBA at the A characteristic sound pressure level. In the configuration in which the reflector 2 is combined with the reflector 1 of Examples 2, 4 and 5, the noise reduction effect can be obtained about 10 dBA at the A characteristic sound pressure level. According to the comparison between Examples 1 and 3 and the comparison between Examples 2 and 4, even if the sound insulating plate 3 is installed and the reflector 1 is downsized, the noise reduction effect is not substantially changed. According to the comparison between Examples 4 and 5, the noise reduction effect does not change substantially even if the reflector 2 is divided.

以上により、本発明によれば、ベランダから窓開口を介して建築物内部に伝搬する屋外騒音をより確実に低減することができ、例えば標準型ベランダと比べてＡ特性音圧レベルで７〜１０ｄＢＡ低減することができる。このため、居室や執務室内の高度な静音化を実現できる。しかもこの効果はベランダの天井高と居室内からの眺望を確保したまま実現できる。さらに、本発明では吸音材を用いないので、吸音材やベランダに対する維持管理の手間やコストを要することなく上記効果を得ることができる。   As described above, according to the present invention, outdoor noise propagating from the veranda through the window opening to the inside of the building can be more reliably reduced. For example, compared with a standard veranda, the A characteristic sound pressure level is 7 to 10 dBA. Can be reduced. For this reason, it is possible to achieve a high level of noise reduction in the living room or office room. Moreover, this effect can be achieved while ensuring the ceiling height of the veranda and the view from the living room. Furthermore, since no sound absorbing material is used in the present invention, the above-described effects can be obtained without requiring maintenance work and costs for the sound absorbing material and the veranda.

また、本発明によれば、窓開口に一重サッシを用いる場合であっても、本発明を適用せずに二重サッシを用いた場合とほぼ同等の屋外騒音に対する遮音性能を実現することができる。このように、二重サッシを用いないことにより、窓サッシの利便性の向上と設計上の自由度とを得ることができる。   In addition, according to the present invention, even when a single sash is used for the window opening, it is possible to achieve a sound insulation performance with respect to outdoor noise that is almost the same as when a double sash is used without applying the present invention. . Thus, by not using the double sash, it is possible to improve the convenience of the window sash and the degree of design freedom.

１，２ 反射体
３ 遮音板（遮音部材）
１０ 第１反射面
１２ 天井面
１４ 床面
１６ 居室
１８ 窓開口
２０ 第２反射面
２２ 屋外
２４ ベランダ手摺り
２６ ベランダ手摺り上端
１００，２００，３００，４００，５００ 遮音性ベランダ構造 1, 2 Reflector 3 Sound insulation plate (sound insulation member)
DESCRIPTION OF SYMBOLS 10 1st reflective surface 12 Ceiling surface 14 Floor surface 16 Living room 18 Window opening 20 2nd reflective surface 22 Outdoor 24 Veranda handrail 26 Upper end of veranda handrail 100,200,300,400,500 Sound insulation veranda structure

Claims (6)

建物の外側に設けられるベランダ構造であって、前記ベランダ構造の斜め下方の前記建物に近接する騒音源から騒音が直接入射する領域のベランダ天井面に対してのみ配置され、入射した前記騒音の音波を反射する第１反射面を備え、前記騒音の直接波の伝搬方向に対する前記第１反射面の傾斜角度を９０度以上に設定したことを特徴とする遮音性ベランダ構造。 A porch structure arranged outside of the building, the noise from a noise source close to the building obliquely downward veranda structure is arranged only for veranda ceiling surface of the area to be directly incident, incident waves of the noise The sound-insulating veranda structure is characterized in that the first reflecting surface is reflected, and the inclination angle of the first reflecting surface with respect to the direct wave propagation direction of the noise is set to 90 degrees or more. 前記ベランダ構造に設置されたベランダ手摺りによる前記騒音の回折波を反射する第２反射面を前記ベランダ構造のベランダ天井面にさらに備え、前記第２反射面を、側面視で凹弧状に設定したことを特徴とする請求項１に記載の遮音性ベランダ構造。 Further comprising a second reflecting surface for reflecting the diffracted waves of the noise due to the installed veranda railing on the veranda structure veranda ceiling of the veranda structure, the second reflecting surface, set to a concave arc shape in a side view The sound insulating veranda structure according to claim 1. 前記第２反射面を、前記ベランダ手摺りの端部を中心とする円弧状に設定したことを特徴とする請求項２に記載の遮音性ベランダ構造。   The sound-insulating veranda structure according to claim 2, wherein the second reflecting surface is set in an arc shape centering on an end portion of the veranda handrail. 前記第２反射面を、前記ベランダ手摺りの上端およびそれより屋外側の１点を焦点とする楕円弧状に設定したことを特徴とする請求項２に記載の遮音性ベランダ構造。   The sound-insulating veranda structure according to claim 2, wherein the second reflecting surface is set in an elliptical arc shape having a focal point at an upper end of the veranda handrail and one point on the outdoor side. 前記ベランダ構造に設置されたベランダ手摺りは、屋外側に延出する板状の遮音部材を有することを特徴とする請求項１から請求項４のいずれか一つに記載の遮音性ベランダ構造。 5. The sound insulating veranda structure according to claim 1, wherein the veranda handrail installed in the veranda structure has a plate-like sound insulating member extending to the outdoor side. 前記第１反射面は反射体の屋外側側面に設けられ、前記反射体の屋内側側面の傾斜角度を、前記騒音の直接波の伝搬方向に合わせたことを特徴とする請求項１から請求項５のいずれか一つに記載の遮音性ベランダ構造。   The first reflection surface is provided on an outdoor side surface of the reflector, and an inclination angle of the indoor side surface of the reflector is adjusted to a propagation direction of the direct wave of the noise. 5. The sound insulating veranda structure according to any one of 5 above.
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