JP3616623B2 - Noise barrier - Google Patents

Noise barrier Download PDF

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Publication number
JP3616623B2
JP3616623B2 JP2002263658A JP2002263658A JP3616623B2 JP 3616623 B2 JP3616623 B2 JP 3616623B2 JP 2002263658 A JP2002263658 A JP 2002263658A JP 2002263658 A JP2002263658 A JP 2002263658A JP 3616623 B2 JP3616623 B2 JP 3616623B2
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JP
Japan
Prior art keywords
noise
blocking wall
roadway
sound
absorbing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002263658A
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Japanese (ja)
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JP2004100270A (en
Inventor
服部昌夫
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有限会社 狭山通信
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Priority to JP2002263658A priority Critical patent/JP3616623B2/en
Publication of JP2004100270A publication Critical patent/JP2004100270A/en
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  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、車道等で発生する騒音を、出来るだけ外部へ伝わらないようにする騒音遮断壁に関するものである。
【0002】
【従来の技術】
自動車が走行することにより発生される騒音を、車道外の民家等へ出来るだけ伝わらないようにするため、しばしば道路に沿って騒音遮断壁が設けられる。
図3は、そのような従来の騒音遮断壁の1例を示す図である。図3において、1は騒音遮断壁、2は騒音遮断壁本体、3は騒音遮断壁上部である。騒音遮断壁1は、道路際に道路に沿って設けられる。図3で括弧で記しているように、騒音遮断壁1より手前側が車道内であり、それより向こう側が車道外である。
【0003】
この例の場合、騒音遮断壁1は、地面から垂直に設置された騒音遮断壁本体2と、該騒音遮断壁本体2の上に形成された騒音遮断壁上部3とより成っている。そして、騒音遮断壁上部3は、内側(車道内側)に湾曲された形状とされている。
車道内で発生された騒音は、騒音遮断壁本体2に反射されたり、騒音遮断壁上部3に反射されたりして、車道外へ出て行くことが阻止される。騒音遮断壁上部3は、斜め上方に向かって出て行こうとする騒音を阻止するが、内側に向かって湾曲されているので、ただ垂直に上方に延びる形状とされているものに比べ、阻止する守備範囲が広くなる。
【0004】
【発明が解決しようとする課題】
(問題点)
しかしながら、前記した従来の騒音遮断壁には、発生される騒音に壁からの反射音が加わって車道内に騒音が充満し、車道内の騒音を更に大きくするので、騒音を遮断する効率が悪いという問題点があった。
【0005】
(問題点の説明)
▲1▼ 車道内で発生した音は、騒音遮断壁1により反射されて車道内に留まるから、車道内には、新たに発生される騒音と反射されて来る騒音とが充満し、いよいよ大きな騒音となる。その騒音の内、騒音遮断壁上部3よりも上の斜め上方へ向かう分は、騒音遮断壁上部3を超えて外部へ出て行くことになるが、騒音自体が大となっているので、その斜め上方へ向かう分も大となる。
【0006】
▲2▼ また、騒音遮断壁1は衝突して来た騒音を反射はするが、騒音音波の衝突力により、騒音遮断壁1自体も僅かではあるが振動することになる。騒音遮断壁1の振動は、そのサイズ(騒音遮断壁本体2の高さ,騒音遮断壁上部3の湾曲長さ)等によって決まる共振周波数による振動ということになるが、該振動による音波は、当然のことながら騒音遮断壁1より外側(車道外側)へも伝わることになる。その音も、車道内に騒音が充満していればいる程、大なるものとなる。
本発明は、以上のような問題点を解決することを課題とするものである。
【0007】
【課題を解決するための手段】
前記課題を解決するため、本発明の騒音遮断壁では、地面より垂直に設置された騒音遮断壁本体と、該騒音遮断壁本体の上部に沿い、断面渦巻き状であってその外部開放部が騒音発生側に向けられて設置された騒音吸収装置とを具える構造とした。
【0008】
(作 用)
騒音遮断壁本体の上部に設置された騒音吸収装置は、そこに入って来る騒音の一部を吸収してしまい、反射するとしても反射音を小さなものとする。そのため、車道内に充満する騒音は従来より減少するので、騒音遮断壁の上方を超えて行く騒音は小さくなるし、騒音遮断壁を振動させることにより外側へ伝達される音も小さくなる。
【0009】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて詳細に説明する。
図1は、本発明にかかわる騒音遮断壁を示す図である。符号は図3のものに対応し、4は騒音吸収装置である。図3の従来例と相違する点は、騒音遮断壁本体2の上部に沿い、内側に湾曲した騒音遮断壁上部3ではなく、特殊な形状をした騒音吸収装置4を取り付ける構造としたという点である。
図2は、その騒音吸収装置4の断面を示す図である。騒音吸収装置4の断面は、適宜回数旋回した渦巻き状とされており、その外部開放部4−1は、騒音が発生する側である車道内側へ向くよう配設されている。
【0010】
車道で発生された騒音は、進入音5の矢印で示すように外部開放部4−1から進入して来る。その騒音は、渦巻き経路を奥へ奥へと進む。奥へ進む内に、音の大きさも減少される。奥まで行った後、反射音6の矢印で示すように出て来ようとする。そのため、騒音吸収装置4の渦巻き経路の途中で、両者はぶつかることになる。ぶつかった時、両方の音波が半波長分だけ異なった状態であれば(つまり、一方の音波は「山」の状態であり、他方の音波は「谷」の状態であれば)、互いに打ち消し合って騒音は消滅してしまう。
言うまでもなく、車道の騒音は種々の波長の音波を含んでいるが、騒音吸収装置4の渦巻き経路の途中のどこかで、進入音5と反射音6とが半波長分だけ異なるという関係になる波長の音は、全て消滅されることになる。従って、外部から見た場合、騒音吸収装置4はまさしく騒音を吸収する装置である。内部で消滅せず、外部開放部4−1から外に出て来る反射音もあるが、途中の反射でエネルギーを消耗しているので、それは相当減少された大きさとなっている。
【0011】
図1に示したように、本発明の騒音遮断壁1は、従来と同様の騒音遮断壁本体2の上部に沿い、前記したような騒音吸収装置4が設置されたものであるが、騒音遮断壁本体2は、従来と同様、車道内で発生された騒音を反射し、車道外へ伝わるのを阻止する。車道内で発生された騒音の内、斜め上方に向かって騒音吸収装置4に入る分は、吸収されてしまうか、反射音が出て来たとしても渦巻き経路の往復で小さなものとされている。
【0012】
従って、従来の騒音遮断壁の場合のように、車道内に反射されて来る騒音は大きなものではなくなり、車道内に充満する騒音も従来より小となる。そのため、騒音吸収装置4の上方を超えて外部へ出てゆく騒音も小さくなるし、騒音遮断壁1自体を振動させる音も弱くなり、従来に比べて騒音を遮断する効率は良くなる。
なお、上例では、車道に沿って設置する騒音遮断壁として用いる場合について述べたが、何もそれに限られるわけではない。何らかの騒音発生源から、騒音が外部へ伝わって行くのを阻止するための壁として、利用することが可能である。例えば、工場の敷地に沿って設置する騒音遮断壁として用いることも出来る。
【0013】
【発明の効果】
以上述べた如く、本発明によれば、騒音遮断壁本体の上部に設置された騒音吸収装置が、そこに入って来る騒音の一部を吸収してしまい、反射するとしても反射音を小さなものとするので、車道内に充満する騒音は従来より減少される。そのため、騒音遮断壁の上方を超えて行く騒音は小さくなるし、騒音遮断壁を振動させることにより外側へ伝達される音も小さくなる。これらにより、外部へ伝わる騒音を遮断する効率が良くなる。
【図面の簡単な説明】
【図1】本発明にかかわる騒音遮断壁を示す図
【図2】騒音吸収装置の断面を示す図
【図3】従来の騒音遮断壁の1例を示す図
【符号の説明】
1…騒音遮断壁、2…騒音遮断壁本体、3…騒音遮断壁上部、4…騒音吸収装置、4−1…外部開放部、5…進入音、6…反射音
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a noise blocking wall that prevents noise generated on a roadway or the like from being transmitted to the outside as much as possible.
[0002]
[Prior art]
In order to prevent as much as possible the noise generated by the automobile from traveling to a private house outside the roadway, noise blocking walls are often provided along the road.
FIG. 3 is a view showing an example of such a conventional noise shielding wall. In FIG. 3, 1 is a noise blocking wall, 2 is a noise blocking wall body, and 3 is a noise blocking wall upper part. The noise blocking wall 1 is provided along the road on the road. As shown in parentheses in FIG. 3, the near side from the noise blocking wall 1 is inside the roadway, and the other side is outside the roadway.
[0003]
In the case of this example, the noise blocking wall 1 is composed of a noise blocking wall main body 2 installed vertically from the ground and a noise blocking wall upper part 3 formed on the noise blocking wall main body 2. And the noise shielding wall upper part 3 is made into the shape curved inside (roadway inner side).
The noise generated in the roadway is reflected on the noise barrier wall body 2 or reflected on the upper part 3 of the noise barrier wall, and is prevented from going out of the roadway. The noise blocking wall upper part 3 prevents noise from going out obliquely upward, but is curved inward so that it is blocked compared to a shape that extends vertically upward. The defense range to be widened.
[0004]
[Problems to be solved by the invention]
(problem)
However, the conventional noise blocking wall described above adds noise reflected from the wall to the generated noise to fill the roadway and further increase the noise in the roadway, so the efficiency of blocking the noise is poor. There was a problem.
[0005]
(Explanation of problem)
(1) Sound generated in the roadway is reflected by the noise barrier 1 and stays in the roadway, so the roadway is filled with newly generated noise and reflected noise. It becomes. Of that noise, the part that goes diagonally above the noise barrier wall upper part 3 goes outside the noise barrier wall upper part 3, but the noise itself is large, The amount of heading upward is also large.
[0006]
{Circle around (2)} Although the noise blocking wall 1 reflects the impacted noise, the noise blocking wall 1 itself vibrates to a slight extent due to the impact force of the noise sound wave. The vibration of the noise blocking wall 1 is a vibration with a resonance frequency determined by its size (the height of the noise blocking wall body 2 and the curved length of the upper portion 3 of the noise blocking wall). Of course, the noise is transmitted to the outside (the outside of the roadway) from the noise blocking wall 1. The sound becomes louder as the road is filled with noise.
An object of the present invention is to solve the above problems.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, in the noise barrier wall of the present invention, the noise barrier wall body installed perpendicular to the ground and the upper part of the noise barrier wall body are spiral in cross section, and the external open part is the noise. The structure is provided with a noise absorbing device installed facing the generation side.
[0008]
(Work)
The noise absorbing device installed at the upper part of the noise barrier wall body absorbs a part of the incoming noise and makes the reflected sound small even if it is reflected. For this reason, the noise filling the roadway is reduced as compared with the prior art, so that the noise that goes over the noise barrier is reduced, and the sound transmitted to the outside is also reduced by vibrating the noise barrier.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing a noise blocking wall according to the present invention. Reference numerals correspond to those in FIG. 3, and 4 is a noise absorbing device. 3 differs from the conventional example of FIG. 3 in that a noise absorbing device 4 having a special shape is attached instead of the noise blocking wall upper portion 3 curved inward along the upper portion of the noise blocking wall body 2. is there.
FIG. 2 is a view showing a cross section of the noise absorbing device 4. The cross section of the noise absorbing device 4 has a spiral shape that has been swirled as many times as necessary, and the external open part 4-1 is arranged so as to face the inner side of the roadway on which noise is generated.
[0010]
The noise generated on the roadway enters from the external opening 4-1 as indicated by the arrow of the approach sound 5. The noise travels back in the spiral path. As you go deeper, the loudness is also reduced. After going to the back, it tries to come out as shown by the arrow of the reflected sound 6. Therefore, both of them collide in the middle of the spiral path of the noise absorbing device 4. When they hit, if both sound waves are different by half a wavelength (that is, one sound wave is in a “mountain” state and the other is in a “valley” state), they cancel each other Noise disappears.
Needless to say, the noise on the roadway includes sound waves of various wavelengths, but somewhere in the spiral path of the noise absorbing device 4, the incoming sound 5 and the reflected sound 6 are different by a half wavelength. All the sound of the wavelength will be extinguished. Therefore, when viewed from the outside, the noise absorbing device 4 is a device that absorbs noise. There is also a reflected sound that does not disappear inside but exits from the external open part 4-1, but since the energy is consumed by reflection in the middle, it is considerably reduced in size.
[0011]
As shown in FIG. 1, the noise blocking wall 1 of the present invention is provided with the noise absorbing device 4 as described above along the upper portion of the noise blocking wall main body 2 similar to the conventional one. The wall body 2 reflects the noise generated in the roadway and prevents it from being transmitted outside the roadway as in the conventional case. Of the noise generated in the roadway, the portion that enters the noise absorbing device 4 obliquely upward is absorbed, or even if reflected sound comes out, it is supposed to be small by the reciprocation of the spiral path. .
[0012]
Therefore, the noise reflected in the roadway is not large as in the case of the conventional noise blocking wall, and the noise filling the roadway is also smaller than before. Therefore, the noise that goes out above the noise absorbing device 4 is reduced, the sound that vibrates the noise blocking wall 1 itself is weakened, and the efficiency of blocking the noise is improved as compared with the conventional case.
In the above example, the case where it is used as a noise blocking wall installed along a roadway has been described, but nothing is limited thereto. It can be used as a wall to prevent noise from being transmitted to the outside from some noise source. For example, it can be used as a noise blocking wall installed along the site of a factory.
[0013]
【The invention's effect】
As described above, according to the present invention, the noise absorbing device installed on the upper part of the noise blocking wall main body absorbs a part of the noise entering there and reduces the reflected sound even if reflected. Therefore, the noise filling the roadway is reduced as compared with the conventional case. Therefore, the noise that goes over the noise blocking wall is reduced, and the sound transmitted to the outside is reduced by vibrating the noise blocking wall. As a result, the efficiency of blocking noise transmitted to the outside is improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a noise blocking wall according to the present invention. FIG. 2 is a sectional view of a noise absorbing device. FIG. 3 is a diagram showing an example of a conventional noise blocking wall.
DESCRIPTION OF SYMBOLS 1 ... Noise-blocking wall, 2 ... Noise-blocking wall main body, 3 ... Noise-blocking wall upper part, 4 ... Noise-absorbing device, 4-1 ... External opening part, 5 ... Approaching sound, 6 ... Reflected sound

Claims (1)

地面より垂直に設置された騒音遮断壁本体と、
該騒音遮断壁本体の上部に沿い、断面渦巻き状であってその外部開放部が騒音発生側に向けられて設置された騒音吸収装置と
を具えたことを特徴とする騒音遮断壁。
A noise barrier wall installed vertically from the ground;
A noise blocking wall comprising: a noise absorbing device installed along the upper part of the noise blocking wall main body, having a spiral cross section and having an external open portion directed toward the noise generating side.
JP2002263658A 2002-09-10 2002-09-10 Noise barrier Expired - Fee Related JP3616623B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002263658A JP3616623B2 (en) 2002-09-10 2002-09-10 Noise barrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002263658A JP3616623B2 (en) 2002-09-10 2002-09-10 Noise barrier

Publications (2)

Publication Number Publication Date
JP2004100270A JP2004100270A (en) 2004-04-02
JP3616623B2 true JP3616623B2 (en) 2005-02-02

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JP2002263658A Expired - Fee Related JP3616623B2 (en) 2002-09-10 2002-09-10 Noise barrier

Country Status (1)

Country Link
JP (1) JP3616623B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100741556B1 (en) * 2005-11-21 2007-07-20 주식회사 태건 Device for reducing noise
WO2008146962A1 (en) * 2007-05-08 2008-12-04 Taegeon Corporation Apparatus for reducing noise

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100833660B1 (en) 2007-05-18 2008-05-29 주식회사 태건 Structure for reducing noise
WO2010065984A1 (en) 2008-12-10 2010-06-17 Ahs Holdings Pty Ltd Development monitoring method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100741556B1 (en) * 2005-11-21 2007-07-20 주식회사 태건 Device for reducing noise
WO2008146962A1 (en) * 2007-05-08 2008-12-04 Taegeon Corporation Apparatus for reducing noise

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