JP2018169531A - Sound-proofing device - Google Patents
Sound-proofing device Download PDFInfo
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- JP2018169531A JP2018169531A JP2017067610A JP2017067610A JP2018169531A JP 2018169531 A JP2018169531 A JP 2018169531A JP 2017067610 A JP2017067610 A JP 2017067610A JP 2017067610 A JP2017067610 A JP 2017067610A JP 2018169531 A JP2018169531 A JP 2018169531A
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- 238000009413 insulation Methods 0.000 claims description 74
- 239000011358 absorbing material Substances 0.000 claims description 9
- 239000006096 absorbing agent Substances 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 description 31
- 230000000694 effects Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Abstract
Description
本発明は、防音装置に関する。 The present invention relates to a soundproofing device.
従来、種々の防音装置が提案されている。例えば、特許文献１には、複数の貫通孔が形成された前面板と、この前面板に対向配置される背面板と、前面板と背面板との間に配置されるスチールウールなどの吸音材と、を備えた防音装置が開示されている。 Conventionally, various soundproofing devices have been proposed. For example, Patent Document 1 discloses a front plate in which a plurality of through holes are formed, a back plate opposed to the front plate, and a sound absorbing material such as steel wool arranged between the front plate and the back plate. The soundproofing device provided with these is disclosed.
ところで、上記のような防音装置は、騒音源に対向するように配置されるが、騒音の大きさによっては多数の防音装置を配置しなければならない。しかしながら、上記のような吸音を行うための構造は安価ではなく、複数の防音装置を準備するのは容易ではなかった。 本発明は、上記問題を解決するためになされたものであり、低コストで防音性能を高めることができる防音装置を提供することを目的とする。 By the way, the soundproofing device as described above is disposed so as to face the noise source. However, depending on the level of noise, a large number of soundproofing devices must be disposed. However, the structure for performing sound absorption as described above is not inexpensive, and it is not easy to prepare a plurality of soundproofing devices. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a soundproofing device that can enhance soundproofing performance at low cost.
本発明に係る防音装置は、対向する一対の側端部を有し、板状に形成された吸音部と、前記吸音体の側端部にそれぞれ連結され、板状に形成された一対の第１遮音部と、を備えている。 The soundproofing device according to the present invention has a pair of side end portions facing each other, and is connected to a sound absorbing portion formed in a plate shape and a side end portion of the sound absorbing body, respectively, and a pair of first end portions formed in a plate shape. 1 sound insulation part.
この構成によれば、吸音部に加え、その両側に板状の第１遮音部を備えている。そのため、防音装置を騒音源に対して対向するように配置すると、吸音部で騒音を吸音できることに加え、第１遮音部において、騒音を騒音源に向かって反射したり、あるいは回折現象によって防音装置の背後への騒音を減衰させることができる。したがって、防音装置を吸音部だけで構成するのに比べ、低コストで高い防音効果を得ることができる。 According to this configuration, in addition to the sound absorbing portion, the plate-like first sound insulating portions are provided on both sides thereof. For this reason, when the soundproofing device is arranged so as to face the noise source, in addition to being able to absorb the noise by the sound absorbing portion, the first sound insulating portion reflects the noise toward the noise source or by a diffraction phenomenon. The noise behind can be attenuated. Therefore, it is possible to obtain a high soundproofing effect at low cost as compared with the case where the soundproofing device is configured by only the sound absorbing portion.
上記防音装置において、前記各第１遮音部は、前記吸音部の前記側端部において旋回可能に連結することができ、前記吸音部と前記両第１遮音部とが重なるように、折り畳み可能に構成することができる。 In the above soundproofing device, each of the first sound insulation parts can be pivotably connected at the side end of the sound absorption part, and can be folded so that the sound absorption part and the first sound insulation parts overlap each other. Can be configured.
この構成によれば、両第１遮音部が吸音部に対して折り畳み可能となっているため、使用時以外には、防音装置をコンパクトな形状にすることができる。したがって、防音装置の搬送を容易に行うことができる。 According to this structure, since both the 1st sound insulation parts can be folded with respect to a sound absorption part, a soundproof apparatus can be made into a compact shape except at the time of use. Therefore, the soundproofing device can be easily transported.
上記各防音装置において、前記吸音部は、前記一対の側端部と直交するように対向する第１端部及び第２端部を有するように構成でき、前記第２端部に連結され、板状に形成された第２遮音部をさらに備えることができる。 In each of the above soundproofing devices, the sound absorbing portion can be configured to have a first end and a second end facing each other so as to be orthogonal to the pair of side ends, and is connected to the second end, A second sound insulation part formed in a shape may be further provided.
この構成によれば、吸音部に加え、吸音部の第１端部に第２遮音部が設けられているため、この第２遮音部によっても騒音の反射や回折現象により防音効果を高めることができる。また、例えば、騒音源から離れた位置にある場合には、吸音部を上側に配置し、第２遮音部を下側に配置することができる。一方、騒音源が地面に近い位置にある場合には、吸音部を下側に配置し、第２遮音部を上側に配置することができる。したがって、防音効果の高い吸音部を、騒音源の位置に対応して配置することができるため、高い防音効果を得ることができる。 According to this configuration, since the second sound insulation portion is provided at the first end of the sound absorption portion in addition to the sound absorption portion, the second sound insulation portion can also enhance the soundproofing effect due to noise reflection and diffraction phenomenon. it can. In addition, for example, when the sound absorbing unit is located away from the noise source, the sound absorbing unit can be disposed on the upper side and the second sound insulating unit can be disposed on the lower side. On the other hand, when the noise source is close to the ground, the sound absorbing part can be arranged on the lower side, and the second sound insulating part can be arranged on the upper side. Therefore, since the sound absorbing portion having a high soundproofing effect can be arranged corresponding to the position of the noise source, a high soundproofing effect can be obtained.
上記各防音装置において、前記第２遮音部は、前記吸音部の前記第１端部において旋回可能に連結することができ、前記吸音部と前記第２遮音部とが重なるように、折り畳み可能に構成することができる。 In each of the above soundproofing devices, the second sound insulating part can be pivotably connected at the first end of the sound absorbing part, and can be folded so that the sound absorbing part and the second sound insulating part overlap each other. Can be configured.
この構成によれば、両第２遮音部が吸音部に対して折り畳み可能となっているため、使用時以外には、防音装置をコンパクトな形状にすることができる。したがって、防音装置の搬送を容易に行うことができる。 According to this structure, since both the 2nd sound insulation parts can be folded with respect to a sound absorption part, a soundproof apparatus can be made into a compact shape except at the time of use. Therefore, the soundproofing device can be easily transported.
上記各防音装置においては、第１端部及び第２端部をそれぞれ有する、複数の脚部をさらに備えることができ、前記各脚部の第１端部は、前記吸音部と前記第２遮音部との連結部分の近傍に旋回可能に連結することができ、前記複数の脚部は、前記複数の脚部と前記第２遮音部とで前記吸音部を支持する第１態様と、前記複数の脚部と前記吸音部とで前記第２遮音部を支持する第２態様と、をとり得るように構成することかができる。 Each of the soundproofing devices may further include a plurality of legs each having a first end and a second end, and the first end of each leg includes the sound absorbing part and the second sound insulation. A plurality of legs that support the sound absorbing part with the plurality of legs and the second sound insulation part; and the plurality of legs. It can be constituted so that it can take the 2nd mode which supports the 2nd sound insulation part with the leg part and the sound absorption part.
この構成によれば、例えば、騒音源が地面から離れた位置にある場合には、複数の脚部を旋回し、第２遮音部と複数の脚部とで吸音部を支持するような第１態様に構成することができる。一方、騒音源が地面に近い場合には、から離れた位置にある場合には、複数の脚部を旋回し、吸音部と複数の脚部とで第２遮音部を支持するような第２態様に構成することができる。したがって、防音効果の高い吸音部を、騒音源の位置に対応して容易に配置することができるため、高い防音効果を得ることができる。 According to this configuration, for example, when the noise source is at a position away from the ground, the plurality of legs are turned, and the first sound-absorbing part is supported by the second sound-insulating part and the plurality of legs. It can be configured in an embodiment. On the other hand, when the noise source is close to the ground, when the sound source is away from the ground, the second sound-insulating part is supported by the second sound-insulating part and the plurality of leg parts by turning the plurality of leg parts. It can be configured in an embodiment. Therefore, since the sound absorbing portion having a high soundproofing effect can be easily arranged corresponding to the position of the noise source, a high soundproofing effect can be obtained.
上記各防音装置では、前記第２遮音部において、前記吸音部の第２端部とは反対側の端部に、少なくとも１つの突部を設けることができる。 In each of the above soundproofing devices, in the second sound insulation unit, at least one protrusion can be provided at an end of the sound absorption unit opposite to the second end.
この構成によれば、例えば、防音装置が第１態様にあるとき、第２遮音部における吸音部の第１端部とは反対側の端部が地面に接することになる。この場合、地面に凹凸があると、第２遮音部を安定的に地面に設置できないが、この端部に突部を設けることで、凹凸がある地面に対応するように第２遮音部を設置することができる。 According to this configuration, for example, when the soundproofing device is in the first mode, the end of the second sound insulating portion opposite to the first end of the sound absorbing portion is in contact with the ground. In this case, if there is unevenness on the ground, the second sound insulation part cannot be stably installed on the ground, but by providing a protrusion at this end, the second sound insulation part is installed to correspond to the uneven surface. can do.
上記各防音装置において、前記吸音部の第１端部には、少なくとも１つの突部をもうけることができる。 In each of the above soundproofing devices, at least one protrusion can be provided at the first end of the sound absorbing portion.
この構成によれば、例えば、防音装置が第２態様にあるとき、吸音部の第２端部が地面に接することになる。この場合、地面に凹凸があると、吸音部を安定的に地面に設置できないが、第２端部に突部を設けることで、凹凸がある地面に対応するように吸音部を設置することができる。 According to this configuration, for example, when the soundproofing device is in the second mode, the second end of the sound absorbing portion comes into contact with the ground. In this case, if there is unevenness on the ground, the sound absorbing part cannot be stably installed on the ground, but by providing a protrusion at the second end, it is possible to install the sound absorbing part so as to correspond to the uneven ground. it can.
上記防音装置において、吸音部は、種々の構成にすることができるが、例えば、前記吸音部は、複数の貫通孔が形成された前面板と、当該前面板と対向するように配置された背面板と、前記前面板と背面板との間に配置された吸音材と、を備えることができる。 In the above soundproofing device, the sound absorbing portion can have various configurations. For example, the sound absorbing portion includes a front plate in which a plurality of through holes are formed and a back plate disposed so as to face the front plate. A face plate and a sound absorbing material disposed between the front plate and the back plate can be provided.
本発明に係る防音装置によれば、低コストで防音性能を高めることができる。 According to the soundproofing device according to the present invention, the soundproofing performance can be enhanced at low cost.
以下、本発明に係る防音装置の一実施形態について図面を参照しつつ説明する。 Hereinafter, an embodiment of a soundproofing device according to the present invention will be described with reference to the drawings.
＜１．防音装置の概要＞
図１は、本発明に係る防音装置の一実施形態であり、一部展開した状態を示す平面図、図２は図１のＡ−Ａ線断面図である。図１及び図２に示すように、この防音装置は、板状の吸音部１を備えている。吸音部１は、上下方向に対向する第１端部１１及び第２端部１２と、左右方向に対向する側端部１３，１４とを有する矩形状に形成されている。そして、吸音部１の両側端部には、それぞれ板状の第１遮音部２が旋回可能に取り付けられている。また、吸音部１の第２端部１２には、板状の第２遮音部３が旋回可能に取り付けられている。さらに、吸音部１の第２端部１２の両側には、棒状に延びる脚部４がそれぞれ旋回可能に取り付けられている。以下、これらの部材について詳細に説明する。
<1. Outline of soundproofing device>
FIG. 1 is a plan view showing a partially expanded state of an embodiment of a soundproof device according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the soundproofing device includes a plate-like sound absorbing portion 1. The sound absorbing portion 1 is formed in a rectangular shape having a first end portion 11 and a second end portion 12 that face each other in the vertical direction, and side end portions 13 and 14 that face each other in the left-right direction. And the plate-shaped 1st sound-insulation part 2 is attached to the both-ends part of the sound-absorption part 1, respectively so that rotation is possible. Further, a plate-like second sound insulation portion 3 is attached to the second end portion 12 of the sound absorbing portion 1 so as to be turnable. Furthermore, on both sides of the second end portion 12 of the sound absorbing portion 1, leg portions 4 extending in a bar shape are respectively attached so as to be able to turn. Hereinafter, these members will be described in detail.
＜２．吸音部＞
図２に示すように、吸音部１は、矩形状の前面板１０１と、この前面板１０１と同形状で、前面板１０１と隙間をあけて対向配置される背面板１０２と、これら前面板１０１と背面板１０２の周縁同士を連結する枠部材１０３と、を備えている。前面板１０１には多数の貫通孔（図示省略）が形成されているが、背面板１０２には貫通孔は形成されていない。また、これら前面板１０１と背面板１０２との間には、複数の反射板１０４が配置されている。各反射板１０４は、矩形状に形成され、左右方向の幅が前面板１０１及び背面板１０２とほぼ同じであり、斜めに傾斜するように配置されている。すなわち、各反射板１０４の上端部が前面板１０１に連結されるとともに、下端部が、上端部よりも低い位置で背面板１０２に連結されている。こうして複数の反射板１０４により、前面板１０１と背面板１０２との隙間は、複数の空間に仕切られている。なお、反射板１０４の下端部は背面板１０２に連結、固定していなくてもよい。また、反射板１０４は、前面板１０１、背面板１０２もしくは枠部材１０３のいずれかに連結、固定されていればよい。
<2. Sound absorbing section>
As shown in FIG. 2, the sound absorbing unit 1 includes a rectangular front plate 101, a rear plate 102 having the same shape as the front plate 101 and facing the front plate 101 with a gap, and these front plates 101. And a frame member 103 for connecting the peripheral edges of the back plate 102 to each other. A number of through holes (not shown) are formed in the front plate 101, but no through holes are formed in the back plate 102. A plurality of reflecting plates 104 are arranged between the front plate 101 and the back plate 102. Each reflecting plate 104 is formed in a rectangular shape, and the width in the left-right direction is substantially the same as that of the front plate 101 and the back plate 102, and is arranged so as to be inclined obliquely. That is, the upper end of each reflector 104 is connected to the front plate 101, and the lower end is connected to the back plate 102 at a position lower than the upper end. Thus, the gap between the front plate 101 and the back plate 102 is partitioned into a plurality of spaces by the plurality of reflecting plates 104. Note that the lower end portion of the reflection plate 104 may not be connected to and fixed to the back plate 102. The reflection plate 104 may be connected and fixed to any one of the front plate 101, the back plate 102, and the frame member 103.
そして、この空間には、吸音材が充填されている。吸音材の材質は特に限定されるものではないが、例えばグラスウール、ロックウール、ポリエステル繊維などの合成繊維、金属繊維等、発泡ウレタン樹脂などの発泡樹脂などを挙げることができる。また、グラスウールなどの繊維状吸音材は水分を含むと変形するため、撥水性のものを用いることが好ましい。グラスウール、ロックウールなどの吸音材の密度は性能と重量のバランスから決定されるが、重量軽減のため、例えば、２４〜３２ｋｇ／ｍ3程度が好ましい。また、ポリエステル繊維の密度範囲は１０〜４０ｋｇ／ｍ3が好ましい。 This space is filled with a sound absorbing material. The material of the sound absorbing material is not particularly limited, and examples thereof include synthetic fibers such as glass wool, rock wool, and polyester fibers, metal fibers, and foamed resins such as foamed urethane resins. Moreover, since a fibrous sound absorbing material such as glass wool is deformed when it contains moisture, it is preferable to use a water-repellent material. The density of the sound absorbing material such as glass wool or rock wool is determined from the balance between performance and weight, but is preferably about 24 to 32 kg / m 3 for weight reduction. Moreover, the density range of the polyester fiber is preferably 10 to 40 kg / m 3 .
また、吸音部１の第１端部１１の両側には、高さの低い突出部１５がそれぞれ設けられている。つまり、枠部材１０３上に、これら突出部１５が設けられている。 In addition, on both sides of the first end portion 11 of the sound absorbing portion 1, low-projections 15 are provided. That is, these protrusions 15 are provided on the frame member 103.
一方、吸音部１の第２端部１２には、左右方向に延びる軸部材１６が取り付けられており、この軸部材１６を介して、第２遮音部３が取り付けられている。なお、軸部材１６の代わりにボルト・ナットで吸音部１と第２遮音部３を回転自在に連結してもよい。 On the other hand, a shaft member 16 extending in the left-right direction is attached to the second end portion 12 of the sound absorbing portion 1, and the second sound insulation portion 3 is attached via the shaft member 16. Note that the sound absorbing portion 1 and the second sound insulating portion 3 may be rotatably connected by bolts and nuts instead of the shaft member 16.
なお、前面板１０１、背面板１０２、及び反射板１０４を構成する材料は、特には限定されず、必要な剛性、耐久性を満たせば、金属、樹脂、木製 合板等で形成することができる。但し、耐久性の面からは、スーパーダイマ鋼板（商品名）、ＺＡＭ鋼板(商品 名)などの高耐食性メッキ鋼板、溶融亜鉛メッキ鋼板などのメッキ鋼板が好ましく、重量の面からはアルミニウム板が好ましい。 In addition, the material which comprises the front board 101, the back board 102, and the reflecting plate 104 is not specifically limited, If required rigidity and durability are satisfy | filled, it can form with a metal, resin, a wooden plywood, etc. However, from the viewpoint of durability, a high corrosion resistance plated steel sheet such as a super-dimer steel sheet (trade name) and a ZAM steel sheet (trade name) and a plated steel sheet such as a hot dip galvanized steel sheet are preferable, and an aluminum plate is preferable from the viewpoint of weight.
＜３．第１遮音部＞
一対の第１遮音部２は、板材によって形成されている。両第１遮音部２は、左右対称な形状であるため、ここでは、右側の第１遮音部２について説明し、左側の第１遮音部２については説明を省略する。図１に示すように、この第１遮音部２は、上下方向に対向する第１端部２１及び第２端部２２と、左右方向に対向する左端部２３及び右端部２４とを有する矩形状に形成されている。左端部２３は、吸音部１の右側の側端部１３とほぼ同じ長さであり、この側端部１３にヒンジ（図示省略）によって連結されている。これにより、第１遮音部２は、吸音部１に対して旋回可能となっており、後述するように、吸音部１の前面板１０１と重なるように折り畳み可能となっている。第１遮音部２の第２端部２２は、水平方向に延びているが、第１端部２１は、傾斜するように延びている。すなわち、左端部２３から離れるにしたがって第２端部２２側に延びるように傾斜している。これにより、第１遮音部２の右端部２４は、吸音部１の側端部１３よりも短くなっているが、吸音部１の側端部１３と平行に延びている。また、第１遮音部２の左右方向の幅は、吸音部１の左右方向の幅の半分程度の長さになっている。
<3. First sound insulation part>
A pair of 1st sound-insulation part 2 is formed with the board | plate material. Since both the first sound insulation units 2 have a bilaterally symmetric shape, only the first sound insulation unit 2 on the right side will be described here, and description of the first sound insulation unit 2 on the left side will be omitted. As shown in FIG. 1, the first sound insulation portion 2 has a rectangular shape having a first end portion 21 and a second end portion 22 that face each other in the vertical direction, and a left end portion 23 and a right end portion 24 that face each other in the left-right direction. Is formed. The left end portion 23 has substantially the same length as the right side end portion 13 of the sound absorbing portion 1 and is connected to the side end portion 13 by a hinge (not shown). Thereby, the 1st sound insulation part 2 can turn with respect to the sound absorption part 1, and can be folded so that it may overlap with the front plate 101 of the sound absorption part 1 so that it may mention later. The second end portion 22 of the first sound insulating portion 2 extends in the horizontal direction, but the first end portion 21 extends so as to be inclined. That is, it inclines so that it may extend to the 2nd end part 22 side as it leaves | separates from the left end part 23. FIG. As a result, the right end 24 of the first sound insulating part 2 is shorter than the side end 13 of the sound absorbing part 1, but extends in parallel with the side end 13 of the sound absorbing part 1. Further, the width of the first sound insulating unit 2 in the left-right direction is about half the width of the sound absorbing unit 1 in the left-right direction.
なお、第１遮音部２を構成する材料は、特には限定されないが、吸音部１の前面板１０１等と同じ材料にすることができる。 In addition, although the material which comprises the 1st sound insulation part 2 is not specifically limited, It can be made into the same material as the front plate 101 etc. of the sound absorption part 1.
＜４．第２遮音部＞
図１に示すように、第２遮音部３は、板材によって形成される本体部３１を備えている。この本体部３１は、上下方向に対向する第１端部３１１及び第２端部３１２と、左右方向に対向する左端部３１３及び右端部３１４とを有する矩形状に形成されている。第２遮音部３の上下方向の長さは、吸音部１よりもやや長く、左右方向の幅も吸音部１よりもやや長くなっている。そして、本体部３１の左端部３１３と右端部３１４には、それぞれ、本体部３１と直交するように立ち上がる板状の側辺部３２が一体的に連結されている。側辺部３２は、本体部３１の左端部３１３及び右端部３１４の全長に亘って延び、さらに第２端部３１２からやや突出するように延びている。また、側辺部３２の第１端部３１１側の端部には、上述した吸音部１の軸部材１６が回転可能に取り付けられている。これにより、第２遮音部３は、吸音部１に対して、軸部材１６を中心に旋回可能に連結されており、後述するように、第２遮音部３を吸音部１に対して折り畳むことができる。このとき、側辺部３２は、吸音部１の側面を覆うように配置される。
<4. Second sound insulation unit>
As shown in FIG. 1, the 2nd sound insulation part 3 is provided with the main-body part 31 formed with a board | plate material. The main body 31 is formed in a rectangular shape having a first end 311 and a second end 312 facing each other in the vertical direction, and a left end 313 and a right end 314 facing each other in the left-right direction. The length of the second sound insulation unit 3 in the vertical direction is slightly longer than that of the sound absorption unit 1, and the width in the left-right direction is also slightly longer than that of the sound absorption unit 1. A plate-like side part 32 that rises so as to be orthogonal to the main body 31 is integrally connected to the left end 313 and the right end 314 of the main body 31. The side portion 32 extends over the entire length of the left end portion 313 and the right end portion 314 of the main body portion 31, and further extends so as to slightly protrude from the second end portion 312. In addition, the shaft member 16 of the sound absorbing unit 1 described above is rotatably attached to the end portion of the side portion 32 on the first end portion 311 side. Thereby, the 2nd sound insulation part 3 is connected with respect to the sound absorption part 1 so that turning is possible centering on the shaft member 16, and the 2nd sound insulation part 3 is folded with respect to the sound absorption part 1 so that it may mention later. Can do. At this time, the side part 32 is disposed so as to cover the side surface of the sound absorbing part 1.
なお、第２遮音部３を構成する材料は、特には限定されないが、吸音部１の前面板１０１等と同じ材料にすることができる。 In addition, although the material which comprises the 2nd sound insulation part 3 is not specifically limited, It can be made into the same material as the front board 101 grade | etc., Of the sound absorption part 1. FIG.
＜５．脚部＞
次に、一対の脚部４について説明する。図１及び図２に示すように、各脚部４は、第２遮音部３の上下方向の長さとほぼ同じ長さの棒状に形成されている。そして、各脚部４の一端部は、吸音部１の各側面と第２遮音部３の側辺部３２との間で、それぞれ、軸部材１６に回転可能に連結されている。したがって、各脚部４は、第２遮音部３と同様に、軸部材１６周りに旋回可能となっている。なお、軸部材１６の代わりに、ボルト・ナットで旋回可能なように、脚部４を吸音部１に連結してもよい。
<5. Leg>
Next, the pair of leg portions 4 will be described. As shown in FIGS. 1 and 2, each leg portion 4 is formed in a rod shape having a length substantially the same as the vertical length of the second sound insulating portion 3. One end portion of each leg portion 4 is rotatably connected to the shaft member 16 between each side surface of the sound absorbing portion 1 and the side portion 32 of the second sound insulating portion 3. Therefore, each leg portion 4 can turn around the shaft member 16 in the same manner as the second sound insulating portion 3. Instead of the shaft member 16, the leg portion 4 may be connected to the sound absorbing portion 1 so that it can be turned by a bolt / nut.
＜６．防音装置の使用方法＞
次に、上記のように構成された防音装置の使用方法について、図３〜図８も参照しつつ説明する。この防音装置は、騒音源が地面Ｅから所定の高さにある場合に用いられる第１態様と、騒音源が地面Ｅに近いところにある場合に用いられる第２態様を取り得るように構成されている。いずれの態様においても、吸音部１の前面板１０１が騒音源と対向するように防音装置を配置する。以下、これら第１態様及び第２態様について説明する。また、この防音装置の折り畳み構造についても説明する。
<6. How to use the soundproof device>
Next, a method of using the soundproofing device configured as described above will be described with reference to FIGS. The soundproofing device is configured to be able to take a first mode used when the noise source is at a predetermined height from the ground E and a second mode used when the noise source is close to the ground E. ing. In any aspect, the soundproofing device is arranged so that the front plate 101 of the sound absorbing unit 1 faces the noise source. Hereinafter, the first aspect and the second aspect will be described. The folding structure of the soundproofing device will also be described.
＜６−１．第１態様＞
まず、図３及び図４に示すように、吸音部１が上側に配置されるように、第２遮音部３を吸音部１に対して旋回し、吸音部１の前面板１０１と、第２遮音部３とのなす角度を１８０°〜２７０°の間に設定する。つまり、第２遮音部３を、吸音部１を挟んで騒音源から離れた側に配置する。次に、両脚部４を旋回し、吸音部１の前面板１０１と、各脚部４とのなす角度を９０°〜１８０°の間で設定する。つまり、両脚部４を、吸音部１を挟んで騒音源に近い側に配置する。こうして、第２遮音部３と両脚部４とで、吸音部１を、地面Ｅから離れた位置で、地面Ｅと概ね垂直に立ち上がるように支持する。このとき、第２遮音部３と両脚部４とのなす角度を調整することで、吸音部１の高さを調整することができる。すなわち、騒音源の高さに応じて、吸音部１の高さを調整する。このとき、第２遮音部３において地面Ｅと接する下端部の両側からは、側辺部３２が突出しているため、図３に示すように、これら突出している両側辺部３２の間には隙間が形成される。すなわち、第２遮音部３の下端部は、直線状に形成されていないため、地面に凹凸があったとしても、これに対応するように、第２遮音部３の下端部を配置することができる。
<6-1. First aspect>
First, as shown in FIGS. 3 and 4, the second sound insulating unit 3 is turned with respect to the sound absorbing unit 1 so that the sound absorbing unit 1 is arranged on the upper side, and the front plate 101 of the sound absorbing unit 1 and the second The angle formed by the sound insulation part 3 is set between 180 ° and 270 °. That is, the second sound insulation unit 3 is disposed on the side away from the noise source with the sound absorption unit 1 interposed therebetween. Next, both the leg portions 4 are turned, and the angle formed between the front plate 101 of the sound absorbing portion 1 and each leg portion 4 is set between 90 ° and 180 °. That is, both the leg portions 4 are arranged on the side close to the noise source with the sound absorbing portion 1 interposed therebetween. Thus, the second sound insulating part 3 and the both leg parts 4 support the sound absorbing part 1 so as to rise substantially perpendicular to the ground E at a position away from the ground E. At this time, the height of the sound absorbing portion 1 can be adjusted by adjusting the angle formed by the second sound insulating portion 3 and the both leg portions 4. That is, the height of the sound absorbing unit 1 is adjusted according to the height of the noise source. At this time, since the side part 32 protrudes from both sides of the lower end part in contact with the ground E in the second sound insulating part 3, as shown in FIG. 3, there is a gap between the protruding side parts 32. Is formed. That is, since the lower end portion of the second sound insulation portion 3 is not formed in a straight line shape, the lower end portion of the second sound insulation portion 3 can be arranged so as to correspond to the unevenness on the ground. it can.
続いて、両第１遮音部２を、吸音部１に対して旋回し、吸音部１と両第１遮音部２とが概ね同一平面に配置されるように、両第１遮音部２の角度を調整する。 Subsequently, both the first sound insulation parts 2 are turned with respect to the sound absorption part 1, and the angle of both the first sound insulation parts 2 is set so that the sound absorption part 1 and both the first sound insulation parts 2 are arranged substantially in the same plane. Adjust.
こうして、第１態様にセットされた防音装置を、騒音源に対して吸音部１の前面板１０１が対向するように配置する。この態様により、前面板１０１の貫通孔から吸音部１内に進入した騒音は、反射板１０４で反射されつつ、吸音材１０５によって音が減衰され、吸音される。また、図５に示すように、第１遮音部２により、吸音部１の側方を伝わる騒音が反射され、遮断される。また、第１遮音部２のさらに側方を伝わる騒音は、回折現象によって減衰されるため、第１遮音部２の後方では騒音を低減することができる。また、第２遮音部３は、吸音部１と地面Ｅとの間に配置されているため、下方に向かう騒音を遮断することができる。特に、第２遮音部は、騒音源から離れるにしたがって下方に傾斜するように配置されているため、図４に示すように、第２遮音部３への騒音は、下方に案内され、地面Ｅに向かう。したがって、地面Ｅが、例えば、砂利などの吸音効果の高い材料で形成されている場合には、騒音が地面Ｅによって吸収されるため、高い吸音効果を得ることができる。こうして、地面Ｅから離れた高い位置にある騒音源からの騒音が、周囲に伝わらないように防音することができる。 In this way, the soundproofing device set in the first mode is arranged so that the front plate 101 of the sound absorbing unit 1 faces the noise source. According to this aspect, the noise that has entered the sound absorbing portion 1 from the through hole of the front plate 101 is attenuated by the sound absorbing material 105 while being reflected by the reflecting plate 104 and is absorbed. Further, as shown in FIG. 5, the noise transmitted to the side of the sound absorbing unit 1 is reflected and blocked by the first sound insulating unit 2. Moreover, since the noise transmitted further to the side of the first sound insulation unit 2 is attenuated by the diffraction phenomenon, the noise can be reduced behind the first sound insulation unit 2. Moreover, since the 2nd sound insulation part 3 is arrange | positioned between the sound absorption part 1 and the ground E, it can interrupt | block the noise which goes below. In particular, since the second sound insulation portion is arranged so as to incline downward as the distance from the noise source increases, the noise to the second sound insulation portion 3 is guided downward as shown in FIG. Head for. Therefore, when the ground E is made of a material having a high sound absorption effect such as gravel, for example, noise is absorbed by the ground E, so that a high sound absorption effect can be obtained. In this way, noise from a noise source located at a high position away from the ground E can be prevented from being transmitted to the surroundings.
＜６−２．第２態様＞
まず、図６及び図７に示すように、第２遮音部３が上側に配置されるように、第２遮音部３に対して吸音部１を旋回し、吸音部１の前面板１０１と、第２遮音部３とのなす角度を１８０°〜２７０°の間に設定する。つまり、吸音部１を、第２遮音部３を挟んで騒音源から離れた側に配置する。次に、両脚部４を旋回し、第２遮音部３と、各脚部４とのなす角度を９０°〜１８０°の間で設定する。つまり、両脚部４を、第２遮音部３を挟んで騒音源に近い側に配置する。こうして、吸音部１と両脚部４とで、第２遮音部３を、地面Ｅから離れた位置で、地面Ｅと概ね垂直に立ち上がるように支持する。このとき、吸音部１と両脚部４とのなす角度を調整することで、第２遮音部３の高さを調整することができる。このとき、図６に示すように、吸音部１において地面Ｅと接する第１端部（下端部）１１の両側からは、突出部１５が突出しているため、これら突出部１５の間には隙間が形成される。すなわち、吸音部１の第１端部１１は、直線状に形成されていないため、地面に凹凸があったとしても、これに対応するように、吸音部１の第１端部１１を配置することができる。
<6-2. Second aspect>
First, as shown in FIGS. 6 and 7, the sound absorbing portion 1 is turned with respect to the second sound insulating portion 3 so that the second sound insulating portion 3 is disposed on the upper side, and the front plate 101 of the sound absorbing portion 1 is The angle formed with the second sound insulation unit 3 is set between 180 ° and 270 °. That is, the sound absorbing unit 1 is disposed on the side away from the noise source with the second sound insulating unit 3 interposed therebetween. Next, both the leg parts 4 are turned, and the angle formed between the second sound insulation part 3 and each leg part 4 is set between 90 ° and 180 °. That is, both leg portions 4 are arranged on the side close to the noise source with the second sound insulation portion 3 interposed therebetween. Thus, the sound absorbing portion 1 and the both leg portions 4 support the second sound insulating portion 3 so as to rise substantially perpendicular to the ground E at a position away from the ground E. At this time, the height of the second sound insulating part 3 can be adjusted by adjusting the angle formed by the sound absorbing part 1 and the both leg parts 4. At this time, as shown in FIG. 6, since the protruding portions 15 protrude from both sides of the first end portion (lower end portion) 11 in contact with the ground E in the sound absorbing portion 1, there is a gap between these protruding portions 15. Is formed. That is, since the first end portion 11 of the sound absorbing portion 1 is not formed in a straight line shape, the first end portion 11 of the sound absorbing portion 1 is disposed so as to correspond to the unevenness on the ground. be able to.
続いて、両第１遮音部２を、吸音部１に対して旋回し、吸音部１と両第１遮音部２とが概ね直交するように、両第１遮音部２の角度を調整する。このとき、両第１遮音部の第１端部２１が、地面に接するように配置されるが、図７に示すように、第１端部２１は傾斜するように形成されているため、吸音部１が斜めに配置されるのに対応して、第１遮音部２の第１端部２１は地面Ｅと概ね平行に延びるようになる。こうして、吸音部１の両側が第１遮音部２で囲まれるような態様を構成する。 Subsequently, both the first sound insulation parts 2 are turned with respect to the sound absorption part 1, and the angles of the first sound insulation parts 2 are adjusted so that the sound absorption part 1 and both the first sound insulation parts 2 are substantially orthogonal to each other. At this time, the first end portions 21 of both the first sound insulation portions are arranged so as to contact the ground. However, as shown in FIG. 7, the first end portions 21 are formed so as to be inclined. Corresponding to the part 1 being disposed obliquely, the first end 21 of the first sound insulation part 2 extends substantially parallel to the ground E. In this way, a configuration in which both sides of the sound absorbing unit 1 are surrounded by the first sound insulating unit 2 is configured.
こうして、第２態様にセットされた防音装置を、騒音源に対して吸音部１の前面板１０１が対向するように配置する。この態様により、地面Ｅ近くの騒音源からの騒音は、吸音部１によって吸音される。また、第１遮音部２及び第２遮音部３により、騒音が遮断される。特に、騒音源よりも上方に伝わる騒音は、第２遮音部３によって反射されたり、遮音されたり、回折現象によって減衰されたりする。こうして、地面Ｅ近くにある騒音源からの騒音が、周囲に伝わらないように防音することができる。 In this way, the soundproofing device set in the second mode is disposed so that the front plate 101 of the sound absorbing unit 1 faces the noise source. According to this aspect, noise from a noise source near the ground E is absorbed by the sound absorbing unit 1. Further, the first sound insulation unit 2 and the second sound insulation unit 3 block noise. In particular, noise transmitted upward from the noise source is reflected by the second sound insulation unit 3, is sound-insulated, or is attenuated by a diffraction phenomenon. Thus, noise can be prevented so that noise from a noise source near the ground E is not transmitted to the surroundings.
防音効果の例として、本実施形態に係る防音装置を第１態様で用いたときの、騒音のレベルを測定したところ、図８のような結果となった。図８は、防音装置を配置したときと、配置しないときの騒音を示すグラフである。図８からすると、この防音措置により、測定した周波数全般に亘って騒音が低減されているが、特に、人が聞き取りやすい１．０ｋＨｚ付近の騒音が本実施形態に係る防音装置によって低減されていることが分かる。 As an example of the soundproofing effect, the noise level when the soundproofing device according to the present embodiment was used in the first mode was measured, and the result shown in FIG. 8 was obtained. FIG. 8 is a graph showing noise when the soundproofing device is arranged and when it is not arranged. According to FIG. 8, noise is reduced over the measured frequencies by this soundproofing measure. In particular, noise around 1.0 kHz that is easy for humans to hear is reduced by the soundproofing device according to this embodiment. I understand that.
＜６−３．折り畳み構造＞
使用後または使用前の防音装置は、折り畳みによりコンパクトな形状にすることができる。図９に示すように、まず、両第１遮音部２を旋回し、吸音部１の前面板１０１と重なるように折り畳む。次に、脚部４を旋回し、第２遮音部３と重なるように配置する。続いて、図１０に示すように、吸音部１を旋回し、第２遮音部３と吸音部１の前面板とが対向するように折り畳む。これにより、吸音部１、両第１遮音部２、及び両脚部４は、第２遮音部３の両側辺部３２の間に配置されるとともに、吸音部１と第２遮音部３との間に、両第１遮音部２及び脚部４が配置されるようになる。すなわち、板状をなすようなコンパクトな形状となる。
<6-3. Folding structure>
The soundproofing device after use or before use can be folded into a compact shape. As shown in FIG. 9, first, both the first sound insulation units 2 are turned and folded so as to overlap the front plate 101 of the sound absorption unit 1. Next, the leg part 4 is turned and arranged so as to overlap the second sound insulation part 3. Subsequently, as shown in FIG. 10, the sound absorbing unit 1 is turned and folded so that the second sound insulating unit 3 and the front plate of the sound absorbing unit 1 face each other. Thereby, the sound absorbing part 1, both the first sound insulating parts 2, and both the leg parts 4 are arranged between the side parts 32 of the second sound insulating part 3, and between the sound absorbing part 1 and the second sound insulating part 3. In addition, both the first sound insulation parts 2 and the leg parts 4 are arranged. That is, it becomes a compact shape that forms a plate shape.
＜７．特徴＞
上記のように構成された防音装置は、以下の効果を得ることができる。
(1) 吸音部１に加え、その両側端部１３、１４に板状の第１遮音部２を設け、さらに第２端部に第２遮音部３を設けている。そのため、防音装置を騒音源に対して対向するように配置すると、吸音部１で騒音を吸音できることに加え、両遮音部２，３において、騒音を騒音源に向かって反射したり、遮音したり、あるいは回折現象によって防音装置の背後への騒音を減衰させることができる。したがって、防音装置を吸音部１だけで構成するのに比べ、低コストで高い防音効果を得ることができる。
<7. Features>
The soundproofing device configured as described above can obtain the following effects.
(1) In addition to the sound absorbing portion 1, a plate-like first sound insulating portion 2 is provided at both side end portions 13 and 14, and a second sound insulating portion 3 is provided at the second end portion. Therefore, when the soundproofing device is disposed so as to face the noise source, the sound absorbing unit 1 can absorb the noise, and in both the sound insulating units 2 and 3, the noise is reflected toward the noise source. Alternatively, the noise behind the soundproofing device can be attenuated by the diffraction phenomenon. Therefore, it is possible to obtain a high soundproofing effect at low cost as compared with the case where the soundproofing device is configured by only the sound absorbing unit 1.
(2) 両第１遮音部２及び第２遮音部３が吸音部１に対して折り畳み可能となっているため、使用時以外には、防音装置をコンパクトな形状にすることができる。したがって、防音装置の搬送を容易に行うことができる。 (2) Since both the first sound insulation part 2 and the second sound insulation part 3 are foldable with respect to the sound absorption part 1, the soundproofing device can be made compact when not in use. Therefore, the soundproofing device can be easily transported.
(3) 上記のように、騒音源が地面から離れた位置にある場合には、複数の脚部４を旋回し、第２遮音部３と複数の脚部４とで吸音部１を支持するような第１態様に構成することができる。一方、騒音源が地面に近い場合には、複数の脚部４を旋回し、吸音部１と複数の脚部４とで第２遮音部３を支持するような第２態様に構成することができる。したがって、防音効果の高い吸音部１を、騒音源の位置に対応して容易に配置することができるため、高い防音効果を得ることができる。 (3) As described above, when the noise source is at a position away from the ground, the plurality of leg portions 4 are turned, and the sound absorbing portion 1 is supported by the second sound insulating portion 3 and the plurality of leg portions 4. Such a first aspect can be configured. On the other hand, when the noise source is close to the ground, the plurality of leg portions 4 are turned, and the second sound insulation portion 3 is supported by the sound absorbing portion 1 and the plurality of leg portions 4. it can. Therefore, since the sound absorbing portion 1 having a high soundproofing effect can be easily arranged corresponding to the position of the noise source, a high soundproofing effect can be obtained.
＜８．変形例＞
以上、本発明の一実施形態について説明したが、本発明はこれに限定されるものではなく、その趣旨を逸脱しない限りにおいて種々の変更が可能である。なお、以下の変形例は、適宜組み合わせ可能である。
<8. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible unless it deviates from the meaning. The following modifications can be combined as appropriate.
＜８−１＞
上記実施形態では、吸音部１、一対の第１遮音部２、第２遮音部３、及び一対の脚部４によって防音装置を構成しているが、本発明に係る防音装置は、少なくとも吸音部１と第１遮音部２とを備えていれば、低コストで高い防音効果を得ることができる。したがって、用途に応じて適宜、第２遮音部３や脚部４を設ければよい。
<8-1>
In the said embodiment, although the sound-insulation apparatus is comprised by the sound-absorbing part 1, a pair of 1st sound-insulation part 2, the 2nd sound-insulation part 3, and a pair of leg part 4, the sound-insulation apparatus which concerns on this invention is at least a sound-absorption part. If 1 and the 1st sound insulation part 2 are provided, a high soundproofing effect can be acquired at low cost. Therefore, what is necessary is just to provide the 2nd sound-insulation part 3 and the leg part 4 suitably according to a use.
＜８−２＞
上記実施形態では、一対の第１遮音部２、第２遮音部３、及び一対の脚部４が、吸音部１に対して折り畳み可能となっているが、これに限定されず、このうち、少なくとも１つが角度を調整できないように固定しておくこともできる。
<8-2>
In the said embodiment, although a pair of 1st sound insulation part 2, a 2nd sound insulation part 3, and a pair of leg part 4 can be folded with respect to the sound absorption part 1, it is not limited to this, Among these, It is also possible to fix at least one so that the angle cannot be adjusted.
＜８−３＞
脚部４の取付位置は特には限定されず、上記のような第１態様または第２態様がとり得るような位置であれば、吸音部１、第１遮音部２、及び第２遮音部３のいずれの位置であってもよい。但し、上記のように、吸音部１と第１遮音部２との連結部分の近傍であることが好ましい。また、脚部４の数も特には限定されず、１または３以上であってもよい。
<8-3>
The attachment position of the leg part 4 is not particularly limited, and the sound absorbing part 1, the first sound insulation part 2, and the second sound insulation part 3 as long as the position can be taken by the first aspect or the second aspect as described above. Any of these positions may be used. However, as described above, it is preferably in the vicinity of the connection portion between the sound absorbing portion 1 and the first sound insulating portion 2. Further, the number of the leg portions 4 is not particularly limited, and may be 1 or 3 or more.
＜８−４＞
吸音部１、一対の第１遮音部２、第２遮音部３の形状は特には限定されず、概ね板状であれば、例えば、矩形以外の形状であってもよく、多角形状、円形状など適宜決定することができる。
<8-4>
The shape of the sound absorbing portion 1, the pair of first sound insulating portions 2, and the second sound insulating portion 3 is not particularly limited, and may be a shape other than a rectangle, for example, a polygonal shape or a circular shape as long as it is generally plate-like. Etc. can be determined as appropriate.
＜８−５＞
吸音部１の構造は、公知のものを適宜利用することができ、少なくとも、複数の貫通孔が形成された前面板と、これに対向する背面板と、これらの間に配置される吸音材と、が設けられていれば、その他の構造は特には限定されない。その他、吸音部１の突出部１５の数も特には限定されない。
<8-5>
As the structure of the sound absorbing portion 1, a publicly known one can be used as appropriate, and at least a front plate in which a plurality of through holes are formed, a back plate facing the front plate, and a sound absorbing material disposed therebetween. As long as, is provided, other structures are not particularly limited. In addition, the number of the protrusions 15 of the sound absorbing unit 1 is not particularly limited.
１ 吸音部
２ 第１遮音部
３ 第２遮音部
４ 脚部
DESCRIPTION OF SYMBOLS 1 Sound absorption part 2 1st sound insulation part 3 2nd sound insulation part 4 Leg part
Claims (8)
前記吸音体の側端部にそれぞれ連結され、板状に形成された一対の第１遮音部と、
を備えている、防音装置。 A sound absorbing portion formed in a plate shape having a pair of opposite side end portions;
A pair of first sound insulation parts connected to the side ends of the sound absorber and formed in a plate shape,
A soundproofing device.
前記吸音部と前記両第１遮音部とが重なるように、折り畳み可能に構成されている、請求項１に記載の防音装置。 Each of the first sound insulating parts is connected so as to be pivotable at the side end of the sound absorbing part,
The soundproofing device according to claim 1, wherein the soundproofing device is configured to be foldable so that the sound absorbing portion and both the first sound insulating portions overlap.
前記第２端部に連結され、板状に形成された第２遮音部をさらに備えている、請求項１または２に記載の防音装置。 The sound absorbing portion has a first end and a second end facing each other so as to be orthogonal to the pair of side ends,
The soundproofing device according to claim 1 or 2, further comprising a second sound insulation portion connected to the second end portion and formed in a plate shape.
前記吸音部と前記第２遮音部とが重なるように、折り畳み可能に構成されている、請求項３に記載の防音装置。 The second sound insulating part is pivotably connected at the first end of the sound absorbing part,
The soundproofing device according to claim 3, wherein the soundproofing device is configured to be foldable so that the sound absorbing portion and the second sound insulating portion overlap each other.
前記各脚部の第１端部は、前記吸音部と前記第２遮音部との連結部分の近傍に旋回可能に連結され、
前記脚部は、
前記脚部と前記第２遮音部とで前記吸音部を支持する第１態様と、
前記脚部と前記吸音部とで前記第２遮音部を支持する第２態様と、
をとり得るように構成されている、請求項４に記載の防音装置。 Further comprising at least one leg each having a first end and a second end;
The first end of each leg is connected to the vicinity of the connecting portion between the sound absorbing part and the second sound insulating part so as to be pivotable,
The legs are
A first mode in which the sound absorbing part is supported by the leg part and the second sound insulating part;
A second mode in which the second sound insulating part is supported by the leg part and the sound absorbing part;
The soundproofing device according to claim 4, wherein the soundproofing device is configured to be able to take
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| JP2016020628A (en) * | 2012-07-31 | 2016-02-04 | インターマン株式会社 | Booth for portable terminal |
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| JPS6111200U (en) * | 1984-06-25 | 1986-01-23 | 松下電工株式会社 | sound adjustment device |
| JPH0764565A (en) * | 1993-06-16 | 1995-03-10 | Toyo Denshoku Kk | Sound adjusting panel |
| JP2008111294A (en) * | 2006-10-31 | 2008-05-15 | Sekisui Jushi Co Ltd | Soundproof device |
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| KR20150056126A (en) * | 2013-11-15 | 2015-05-26 | 오휘진 | Soundproofing walls |
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