JP2000008333A - Structure for reducing traffic noise emitted upward - Google Patents
Structure for reducing traffic noise emitted upwardInfo
- Publication number
- JP2000008333A JP2000008333A JP11117083A JP11708399A JP2000008333A JP 2000008333 A JP2000008333 A JP 2000008333A JP 11117083 A JP11117083 A JP 11117083A JP 11708399 A JP11708399 A JP 11708399A JP 2000008333 A JP2000008333 A JP 2000008333A
- Authority
- JP
- Japan
- Prior art keywords
- sound absorbing
- sound
- traffic noise
- plate
- road
- 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.)
- Granted
Links
Landscapes
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、両側が壁で上部に
開口を有する道路又は鉄道における交通騒音の低減構造
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reducing traffic noise on a road or railroad having walls on both sides and an opening at an upper portion.
【０００２】[0002]
【従来の技術】高速道路や鉄道の騒音防止のために、道
路あるいは線路の両側に直形の防音壁又は上端がしのび
返し形構造である防音壁を設置する方法、さらには半地
下式の堀割構造として堀割内面に吸音板を設置する方
法、あるいは両側の壁と天井部とで覆い囲む方法などが
採られてきている。2. Description of the Related Art In order to prevent noise on expressways and railways, a method of installing a straight sound-insulating wall or a sound-insulating wall having a resilient upper end structure on both sides of a road or a railroad, and a semi-underground trenching method As a structure, a method of installing a sound absorbing plate on the inner surface of a moat split, or a method of covering with a wall and a ceiling on both sides has been adopted.
【０００３】上部に天井あるいは覆いを設けたトンネル
型の道路は、防音性能は高いが、排気ガスが充満する
ために排気設備を必要とする、照明設備を必要とす
る、といった問題点があった。これらの問題点を解決す
る方法として、例えば特公昭５４−１８４９２号公報に
は、車道を取り囲むようにトンネル状の防音壁を設け、
その防音壁に外部が見える程度の間隔の間隙構造（開口
部）を設けることが記載されている。この方法によれ
ば、排気及び照明の問題はほぼ解決できるが、防音壁に
設けた開口部から音がそのまま抜け出て道路側方を含む
周囲に放射されるので、防音効果という面からは不十分
である。[0003] Tunnel-type roads having a ceiling or cover at the top have high soundproofing performance, but have the problem that exhaust equipment is required to fill with exhaust gas, and lighting equipment is required. . As a method of solving these problems, for example, Japanese Patent Publication No. 54-18492 discloses a method of providing a tunnel-shaped sound-insulating wall so as to surround a roadway.
It is described that the soundproof wall is provided with a gap structure (opening) at such an interval that the outside can be seen. According to this method, the problems of exhaust and lighting can be almost solved. However, since sound exits directly from the opening provided in the soundproof wall and is radiated to the surroundings including the side of the road, the soundproof effect is insufficient. It is.
【０００４】一方、特開昭４９−１７０２６号公報に
は、堀割構造の道路の上方開口部に１又は複数の帯状の
吸音板を道路の延長方向に沿って鉛直に設置することが
記載されている。同公報によれば、吸音板に衝突した音
が消滅又は減衰するため、道路上で発生した音のうち水
平方向成分が減少し、道路沿いの家屋等に伝わる騒音を
軽減できる。また、特開昭５５−１１１７０５号公報に
は、両側に防音壁を設けるか又は堀割構造とした道路の
上方開口部に、吸音材等からなる上下方向に開放した多
数の筒型セルの集合体を設置することが記載されてい
る。同公報によれば、垂直又はそれに近い角度の指向性
を持つ音はそのまま筒型セルを抜け出るが、それ以外の
音は筒型セルの内壁に衝突し、あるいは衝突を繰り返し
て減衰するため、上方開口部から放射される音は道路側
方への指向性が小さくなり、道路側方での騒音を軽減で
きる。On the other hand, Japanese Patent Application Laid-Open No. 49-17026 discloses that one or a plurality of band-shaped sound-absorbing plates are vertically installed along an extension direction of a road at an upper opening portion of a road having a trench structure. I have. According to the publication, since the sound colliding with the sound absorbing plate disappears or attenuates, the horizontal component of the sound generated on the road is reduced, and the noise transmitted to a house or the like along the road can be reduced. Japanese Unexamined Patent Publication No. 55-111705 discloses an aggregate of a large number of vertically open cylindrical cells made of a sound absorbing material or the like at the upper opening of a road provided with soundproof walls on both sides or a cutout structure. Is described. According to the gazette, sound having a directivity of vertical or close to it exits the tubular cell as it is, but other sounds collide with the inner wall of the tubular cell or are attenuated by repeated collisions. The sound radiated from the opening has less directivity to the side of the road, and noise on the side of the road can be reduced.
【０００５】[0005]
【発明が解決しようとする課題】ところで、近年、堀割
形道路の近傍に高層ビルディングが建設され、上部階で
交通騒音が問題となる場合がある。この場合の交通騒音
の堀割道路周辺の音圧分布状態を、公知の境界要素法を
用い数値解析によりシミュレーションした（参考；日本
機械学会論文集(C編)60巻453号(昭和59年5月)P.848-85
6）。図２６（ａ）に示す堀割道路において、Ｓに音源
を配置したときの堀割道路内及び地表の幅８０ｍ高さ４
０ｍの範囲内で観測される音場のシミュレーション結果
を図２６（ｂ）に示す。なお、この解析対象の堀割道路
は、全幅Ｗ1：２０．５ｍ、天井までの高さＨ1：７．０
ｍ、開口部の幅Ｗ2：９．５ｍ、既設吸音板の高さｈ1：
４ｍ、天井から地表までの高さＨ2：２．５ｍ、ブロッ
ク塀の高さＨ3：１．８ｍとし、音源の周波数は１００
０Ｈｚとした。このシミュレーション結果をみると、上
方ほど音波が道路側方へ放射されるという広範な広がり
角度を有する音場であることが分かった。In recent years, a high-rise building has been constructed in the vicinity of a trench-shaped road, and traffic noise may become a problem on the upper floor. In this case, the sound pressure distribution around the moat road was simulated by numerical analysis using the well-known boundary element method. (Reference: Transactions of the Japan Society of Mechanical Engineers (C) Vol. 60, No. 453 (May 1984) ) P.848-85
6). In the cut road shown in FIG. 26 (a), when the sound source is arranged at S, the width 80 m in the cut road and the height of the ground surface 4
FIG. 26B shows a simulation result of a sound field observed within a range of 0 m. In addition, the chopping road to be analyzed has a total width W1: 20.5 m and a height H1 to the ceiling H1: 7.0.
m, opening width W2: 9.5 m, height h1 of existing sound absorbing plate:
4m, height from ceiling to ground surface H2: 2.5m, height of block wall H3: 1.8m, sound source frequency is 100
It was set to 0 Hz. According to the simulation results, it was found that the sound field had a wide divergence angle in which the sound waves were radiated toward the side of the road toward the upper side.
【０００６】この音波の広がりを抑制する方法として、
図２７に示すように、堀割道路の開口部に両面を吸音表
面とした複数列の吸音板（高さｈ2：２．７ｍ、幅ｔ2：
０、２ｍ、吸音表面全長：４３．２ｍ）を道路の延長方
向に沿って鉛直に設置すると（ａ）、特開昭４９−１７
０２６号公報又は特開昭５５−１１１７０５号公報に記
載されたと同様に、水平方向成分を持つ音が吸音板に衝
突し、あるいは衝突を繰り返して減衰するため、開口部
から吸音板を通って放射される音の側方への指向性を弱
め道路側方への広がりを抑えることが可能となる
（ｂ）。しかし、十分な減衰効果を実現するためには、
前記のように相当な鉛直方向長さを持つ吸音板を多数列
並べる必要があり、経済性に問題が生じる。As a method of suppressing the spread of the sound wave,
As shown in FIG. 27, a plurality of rows of sound absorbing plates (height: 2.7 m, width t2:
0, 2 m, the total length of the sound absorbing surface: 43.2 m) is installed vertically along the extension direction of the road (a).
As described in Japanese Patent Application Laid-Open No. 026 or Japanese Patent Application Laid-Open No. 55-111705, since a sound having a horizontal component collides with the sound absorbing plate or is attenuated by repeating the collision, the sound is radiated from the opening through the sound absorbing plate. It is possible to weaken the directivity of the sound to be directed to the side and suppress the spread to the side of the road (b). However, in order to achieve a sufficient damping effect,
As described above, it is necessary to arrange a large number of sound absorbing plates having a considerable vertical length, which causes a problem in economy.
【０００７】本発明は、従来技術の上記問題点に鑑みて
なされたもので、両側が壁で上部に開口を有する道路又
は鉄道において、開口部から上方に放射される交通騒音
を低減し、経済的であり、かつ自然の換気や採光を大き
く阻害しない交通騒音の低減構造を得ることを目的とす
る。The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to reduce traffic noise radiated upward from an opening on a road or railroad having an opening at the top with walls on both sides, thereby reducing the cost. It is an object of the present invention to obtain a traffic noise reduction structure which does not hinder natural ventilation and lighting.
【０００８】[0008]
【課題を解決するための手段】本発明では、両側が壁で
上部に開口を有する道路又は鉄道において上方に放射さ
れる交通騒音を効率的に低減するため、吸音板の吸音表
面が鉛直方向を向くように設置するのではなく、複数の
吸音板の吸音表面が適当な傾き角度をもつように設置す
るか、水平になるように設置するとともに、隣接する吸
音板同士が互いに間隔をおくように設置する。これによ
り、交通騒音源から上方へ放射される直接音が吸音面に
衝突する面積、つまり有効吸音面積を広く取ることがで
き、効率よく吸音される。また、隣接する吸音板の間に
隙間があることから、自然の換気及び採光が確保され
る。According to the present invention, in order to efficiently reduce traffic noise radiated upward on a road or railroad having an opening at the top with walls on both sides, the sound absorbing surface of the sound absorbing plate has a vertical direction. Instead of installing them so that they face each other, install them so that the sound absorbing surfaces of a plurality of sound absorbing plates have an appropriate inclination angle, or install them horizontally so that adjacent sound absorbing plates are spaced from each other. Install. As a result, an area where the direct sound radiated upward from the traffic noise source collides with the sound absorbing surface, that is, an effective sound absorbing area can be widened, and the sound is efficiently absorbed. In addition, since there is a gap between adjacent sound absorbing plates, natural ventilation and daylighting are ensured.
【０００９】具体的には、本発明の低減構造の１つは、
開口部に傾斜した下向きの吸音表面を有する複数の吸音
板が互いに間隔をおいて設置されている、というもので
ある。この場合、その吸音板が、さらに傾斜した上向
きの吸音表面を有すること、道路又は鉄道の延長方向
に沿って設置されていること、上下に複数段設置され
ていること、各吸音板の鉛直方向の投影がほぼ接する
か又は一部重なり合うようにされていること等、適宜の
形態を取り得るし、また、この傾斜した吸音表面を有す
る吸音板を、後述する水平の吸音表面を有する吸音板
や、前述の吸音表面が鉛直方向に向く吸音板、従来例の
筒型セル等と組み合わせて配置することもできる。Specifically, one of the reduction structures of the present invention is:
A plurality of sound absorbing plates having inclined downward sound absorbing surfaces in the openings are provided at intervals from each other. In this case, the sound-absorbing plate has a further inclined upward sound-absorbing surface, that it is installed along the extension direction of the road or railway, that it is installed in multiple stages vertically, and that the vertical direction of each sound-absorbing plate The projections can be in any form, such as being substantially in contact with or partially overlapping with each other.In addition, a sound absorbing plate having this inclined sound absorbing surface, a sound absorbing plate having a horizontal sound absorbing surface described later, Alternatively, it may be arranged in combination with a sound absorbing plate having the above-described sound absorbing surface oriented in the vertical direction, a conventional cylindrical cell, or the like.
【００１０】上記の〜には次のような作用がある。
上向きの吸音表面には直接音が衝突しなくても、その
表面をかすめるように進む音を減衰させる効果があり、
また、他の吸音板から反射した音が衝突したとき、それ
を減衰させる。道路又は鉄道の延長方向に沿って設置
されていることで、側方への騒音低減効果が大きく、し
かも延長方向に沿った全域で均等な騒音低減効果が得ら
れる。吸音板は互いに間隔をおいて設置されているた
め自然換気と採光を確保できるが、反面、その隙間から
直接音や反射音が上方に放射される。しかし、上下複数
段にすることで、上段の吸音板がそれを吸収し効率的に
音を減衰させることができる。傾斜が同じであれば各
吸音板の鉛直方向の投影が互いに接近するほど吸音性能
が高く、逆に自然換気及び採光機能は低下する。吸音性
能を重視する意味から、鉛直方向の投影が接近又は重な
り合うように各吸音板を配置することができる。その場
合、例えば吸音板を２段以上に設置すれば、各段の吸音
板の間隔を広くでき、自然換気及び採光機能の低下を小
さくすることができる。The above-mentioned has the following effects.
Even if the sound does not collide directly with the upward sound absorbing surface, it has the effect of attenuating the sound that proceeds to graze the surface,
Further, when a sound reflected from another sound absorbing plate collides, it is attenuated. By being installed along the extension direction of the road or the railway, the noise reduction effect to the side is large, and moreover, a uniform noise reduction effect is obtained over the entire area along the extension direction. Since the sound absorbing plates are arranged at intervals from each other, natural ventilation and lighting can be ensured, but on the other hand, direct sound and reflected sound are radiated upward from the gap. However, by providing a plurality of upper and lower stages, the sound absorbing plate in the upper stage can absorb the sound and efficiently attenuate the sound. If the inclination is the same, the closer the projections of the sound absorbing plates in the vertical direction are to each other, the higher the sound absorbing performance is, and conversely, the natural ventilation and lighting functions are reduced. From the viewpoint of emphasizing sound absorbing performance, each sound absorbing plate can be arranged so that the projections in the vertical direction approach or overlap. In this case, for example, if the sound absorbing plates are provided in two or more stages, the interval between the sound absorbing plates in each stage can be widened, and the deterioration of the natural ventilation and lighting function can be reduced.
【００１１】また、本発明の低減構造の１つは、道路又
は鉄道の延長方向に垂直な断面をみたとき、開口部に水
平な下向きの吸音表面を有する複数の吸音板が互いに間
隔をおいて設置されている、というものである。あるい
は、開口部に水平な下向きの吸音表面を有する複数の吸
音板が互いに間隔をおき、かつ上下に複数段設置されて
いる、というものである。吸音表面が下向きに水平であ
るため、直接波に対する吸音面積が大きい。なお、念の
ためにいえば、前者の場合、上記吸音板を上下に複数段
設置するという形態をとり得るし、また、後者の場合、
道路又は鉄道の延長方向に垂直な断面である必要はな
い。[0011] One of the reduction structures of the present invention is that a plurality of sound absorbing plates having a horizontal downward sound absorbing surface in an opening are spaced apart from each other when viewed in a cross section perpendicular to the direction of extension of a road or a railway. It is installed. Alternatively, a plurality of sound-absorbing plates having a horizontal downward sound-absorbing surface in the opening are spaced apart from each other and are provided in a plurality of stages vertically. Since the sound absorbing surface is horizontal downward, the sound absorbing area for direct waves is large. In the meantime, in case of the former, in the former case, it is possible to adopt a form in which the sound absorbing plate is provided in a plurality of stages vertically, and in the latter case,
It does not need to be a cross section perpendicular to the direction of road or rail extension.
【００１２】この低減構造（水平な下向きの吸音表面）
において、吸音板が上下に複数段設置されている場合
は、その吸音板がさらに上向きの吸音表面を有すること
（ただし、最上段の吸音板には上向きの吸音表面は余り
意味がない）、道路又は鉄道の延長方向に沿って設置
されていること、各吸音板の鉛直方向の投影がほぼ接
するか又は一部重なり合うようにされていること等、適
宜の形態を取り得るし、また、この水平の吸音表面を有
する吸音板を、前述の傾斜した吸音表面を有する吸音板
や、吸音表面が鉛直方向に向く吸音板、従来例の筒型セ
ル等と組み合わせて配置することもできる。なお、上記
〜の作用は前記と同様である。This reduction structure (horizontal downward sound absorbing surface)
In the case where the sound absorbing plate is installed in a plurality of stages vertically, the sound absorbing plate has a further upward sound absorbing surface (however, the uppermost sound absorbing plate does not have much meaning to the upward sound absorbing surface), Or, it may be installed along the extension direction of the railway, the vertical projection of each sound absorbing plate may be almost touching or partially overlapping, etc. The sound absorbing plate having the above-described sound absorbing surface may be arranged in combination with the above-described sound absorbing plate having the inclined sound absorbing surface, the sound absorbing plate having the sound absorbing surface oriented in the vertical direction, a conventional cylindrical cell, or the like. The above operations (1) to (3) are the same as described above.
【００１３】これまで述べた低減構造では、開口部を覆
う吸音板の水平方向の間隔を狭くしたり、吸音板を多段
に設置した場合などは、その分、下方の路上空間への光
が遮られる。この採光性の低下を補うため、必要に応じ
て、吸音板の裏面側の表面を太陽光を反射するような材
質にする（例えば、吸音材の裏面を覆う裏面板をアルミ
製とする）ことができる。吸音表面についても同様とし
（例えば、吸音材の前面に配置した多孔板をアルミ製と
する）、吸音板の両側面についても適宜太陽光を反射す
る材質とすることができる。吸音板の傾斜した裏面側の
表面又は吸音表面に太陽光が反射して開口部から路上空
間に入り、あるいは水平又は傾斜した吸音表面を有する
複数の吸音板が上下に間隔をおいて又は上下に複数段設
置されている場合、下位の裏面側表面と上位の吸音表面
との間で太陽光が散乱し、下方の路上空間へ光が導かれ
やすくなる。太陽光を反射、散乱させる裏面側表面の形
状としては、例えば平面又は上に凸の形状が考えられ
る。なお、先に述べた点と一部重複するが、本発明の低
減構造に使用される吸音板では、吸音表面（具体的には
多孔板が設けられた面）を吸音材を取り囲む枠体の少な
くとも２面、望ましくは１方の広面とさらに他の少なく
とも１面、例えば他方の広面やいずれか一方又は双方の
狭面（側面）を吸音表面とすることもできる。In the above-described reduction structure, when the sound absorbing plate covering the opening is narrowed in the horizontal direction, or when the sound absorbing plate is installed in multiple stages, the light to the lower road space is blocked accordingly. Can be In order to compensate for this decrease in lighting, if necessary, the surface on the back side of the sound absorbing plate should be made of a material that reflects sunlight (for example, the back plate covering the back surface of the sound absorbing material is made of aluminum). Can be. The same applies to the sound absorbing surface (for example, the perforated plate disposed on the front surface of the sound absorbing material is made of aluminum), and both sides of the sound absorbing plate can be made of a material that appropriately reflects sunlight. The sunlight is reflected on the inclined back surface or the sound absorbing surface of the sound absorbing plate and enters the road space from the opening, or a plurality of sound absorbing plates having a horizontal or inclined sound absorbing surface are spaced vertically or vertically. When a plurality of stages are installed, sunlight is scattered between the lower back surface and the upper sound absorbing surface, and light is easily guided to the lower road space. As the shape of the back side surface that reflects and scatters sunlight, for example, a flat surface or an upwardly convex shape can be considered. In addition, although partially overlapping with the points described above, in the sound absorbing plate used in the reduction structure of the present invention, the sound absorbing surface (specifically, the surface on which the perforated plate is provided) is formed of a frame surrounding the sound absorbing material. At least two surfaces, desirably one wide surface and at least one other surface, for example, the other wide surface and / or one or both narrow surfaces (side surfaces) may be sound absorbing surfaces.
【００１４】さらに、本発明は、両側が壁で上部に開口
を有する道路又は鉄道において上方に放射される交通騒
音を効率的に低減するため、吸音板の吸音表面が鉛直方
向を向くように設置したものを含む。具体的には、道路
又は鉄道の延長方向に垂直な断面をみたとき、上部開口
部に鉛直な吸音表面を有する複数の吸音板が水平方向に
互いに間隔をおいて、かつ上下複数段に設置され、さら
に、上下の吸音板の水平方向位置がずらされている。こ
れにより、下段を通過して放射されようとする音を吸収
し、上方に放射される音をさらに減衰させることができ
る。この場合も、道路又は鉄道の延長方向に沿って設置
されていることが好ましい。また、吸音表面を鉛直な面
だけでなく、必要に応じてさらに他の少なくとも１面
（特に下向きの面）を吸音表面とすることもできる。Furthermore, in order to efficiently reduce traffic noise radiated upward on a road or railroad having an opening at the top with walls on both sides, the present invention is installed such that the sound absorbing surface of the sound absorbing plate is oriented vertically. Including those that did. Specifically, when a cross section perpendicular to the direction of extension of the road or railway is viewed, a plurality of sound absorbing plates having a vertical sound absorbing surface in the upper opening are horizontally spaced from each other, and are installed in a plurality of upper and lower steps. Further, the horizontal positions of the upper and lower sound absorbing plates are shifted. This makes it possible to absorb sound that is going to be radiated through the lower stage and further attenuate sound that is radiated upward. Also in this case, it is preferable to be installed along the extension direction of the road or railway. The sound absorbing surface may be not only a vertical surface but also at least one other surface (particularly, a downward surface) if necessary.
【００１５】[0015]
【発明の実施の形態】以下、図１〜図２５を参照して、
本発明に係る交通騒音の低減構造の具体例をいくつか説
明する。図１に示す構造は、堀割道路の開口部に、傾斜
した吸音表面を有する複数の吸音板を、道路の延長方向
に沿って、かつ水平方向に互いに同じ間隔ａをおいて設
置したものであり、特に道路左側での騒音の低減を重視
したもので、道路左側へ向かう音に対する吸音面積が広
くなっている。この場合、少なくとも下向きの広面１が
吸音表面となっていればよいが、より高い騒音低減性能
を求めるのであれば、一部又は全部の吸音板の上向きの
広面２及び下向きの狭面３も吸音表面とするとよい。な
お、この例では、各吸音板の鉛直方向の投影をみると間
隔ｂが空いているが、騒音低減性能を重視するのであれ
ば、より多数の吸音板を密に設置したり、各吸音板の広
面の幅を大きくして間隔ｂを狭め、あるいは鉛直方向の
投影がほぼ接するか（ｂ＝０）又は一部重なり合うよう
にしてもよい。その場合でも、各吸音板が水平方向に間
隔をおいて設置されているので、自然換気及び採光が確
保される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
Some specific examples of the traffic noise reduction structure according to the present invention will be described. The structure shown in FIG. 1 is such that a plurality of sound absorbing plates having an inclined sound absorbing surface are installed at the same interval a in the horizontal direction along the extension direction of the road at the opening of the trench road. In particular, emphasis is placed on reducing noise on the left side of the road, and the sound absorbing area for sound traveling toward the left side of the road is widened. In this case, it is sufficient that at least the downward wide surface 1 is the sound absorbing surface. However, if higher noise reduction performance is required, the upward wide surface 2 and the downward narrow surface 3 of some or all of the sound absorbing plates are also sound absorbing. The surface should be good. Note that, in this example, the interval b is wide when viewed in the vertical direction of each sound absorbing plate. However, if emphasis is placed on noise reduction performance, a greater number of sound absorbing plates may be densely installed or each sound absorbing plate may be densely arranged. The width of the wide surface may be increased to reduce the interval b, or the projections in the vertical direction may be almost in contact (b = 0) or may partially overlap. Even in such a case, natural ventilation and lighting can be ensured because the sound absorbing plates are installed at intervals in the horizontal direction.
【００１６】図２に示す構造は、図１の構造のように吸
音板を同方向に傾斜させて配置するのではなく、左右対
象に傾斜して配置したもので、道路の左右両側へ向かう
騒音を同じように低減する効果がある。図３に示す構造
は、傾斜の向きが逆にされた吸音板が上下２段に設置さ
れ、各段の吸音板は水平方向に互いに間隔をおき、上下
の段でみると吸音板は千鳥配置となり、鉛直方向の投影
が一部重なり合うようにされている。この構造は、騒音
源からの直接音が開口部を抜け出るのを遮っている。図
４に示す構造は、断面くの字形の複数の吸音板を水平方
向に互いに間隔をおいて設置したもの、図５に示す構造
は、同形状の吸音板を水平方向に互いに間隔をおき、か
つ各吸音板の鉛直方向の投影がほぼ接するように設置さ
れたもの、図６に示す構造は、くの字が上下に２つ連な
った形状の吸音板を水平方向に互いに間隔をおいて設置
したものである。いずれも吸音面積を広く取ることがで
き、外部への騒音を減衰させる効果が高い。The structure shown in FIG. 2 does not arrange the sound absorbing plates in the same direction as in the structure of FIG. Is similarly reduced. In the structure shown in FIG. 3, sound absorbing plates with inverted inclinations are installed in two upper and lower stages, and the sound absorbing plates in each stage are spaced apart from each other in the horizontal direction. And the projections in the vertical direction are partially overlapped. This structure blocks direct sound from the noise source from exiting the opening. The structure shown in FIG. 4 is such that a plurality of sound absorbing plates having a U-shaped cross section are arranged at intervals in the horizontal direction, and the structure shown in FIG. 5 is such that sound absorbing plates of the same shape are arranged at intervals in the horizontal direction. The sound absorbing plates are installed so that the projections in the vertical direction of the sound absorbing plates are almost in contact with each other. The structure shown in FIG. 6 is such that sound absorbing plates having a shape in which two U-shapes are vertically arranged are spaced apart from each other in the horizontal direction. It was done. In each case, a large sound absorption area can be obtained, and the effect of attenuating external noise is high.
【００１７】図７に示す構造は、堀割道路の開口部に、
道路の延長方向に沿って、水平な下向きの吸音表面４を
有する複数の吸音板を水平方向に同じ間隔ｃをおき、か
つ上下２段に設置したものである。上下の吸音板は千鳥
配置となり、鉛直方向の投影がちょうど接するようにさ
れている。吸音表面４が水平であるため、直接音に対す
る吸音面積が広い。この場合、上下の吸音板の少なくと
も下向きの広面４が吸音表面となっていればよいが、よ
り高い騒音低減性能を求めるのであれば、下段の吸音板
はその一部又は全部で上向きの広面５及び左右の狭面
６、７も吸音表面とし、上段の吸音板はその一部又は全
部で左右の狭面６、７も吸音表面とするとよい。図８に
示す構造は、各段の吸音板の水平方向の間隔を狭めたも
ので、鉛直方向の投影が重なるようにされ、騒音源から
の直接音が開口部を抜け出るのを遮っているため、騒音
低減性能が高い。[0017] The structure shown in FIG.
A plurality of sound absorbing plates having a horizontal downward sound absorbing surface 4 are arranged at equal intervals c in the horizontal direction along the extending direction of the road, and are installed in two upper and lower stages. The upper and lower sound absorbing plates are arranged in a staggered arrangement so that the projections in the vertical direction are in direct contact. Since the sound absorbing surface 4 is horizontal, the sound absorbing area for direct sound is large. In this case, it is sufficient that at least the downward wide surface 4 of the upper and lower sound absorbing plates be the sound absorbing surface. However, if higher noise reduction performance is required, the lower sound absorbing plate is partially or wholly the upward wide surface 5. The left and right narrow surfaces 6 and 7 may also be sound absorbing surfaces, and the upper and lower sound absorbing plates may partially or entirely have the left and right narrow surfaces 6 and 7 also have sound absorbing surfaces. The structure shown in FIG. 8 is a structure in which the horizontal spacing of the sound absorbing plates in each stage is narrowed so that the projections in the vertical direction are overlapped, and the direct sound from the noise source is prevented from passing through the opening. High noise reduction performance.
【００１８】図９に示す構造は、傾斜した下向きの吸音
表面を有する吸音板と水平な下向きの吸音表面を有する
吸音板が２段に設置され、それぞれの段では各吸音板は
水平方向に間隔をおいて設置されている。図３に示す構
造とほぼ同等といえるが、それより設置面積がやや節約
できる。図１０に示す構造は、両面が吸音表面とされそ
れが鉛直方向に向く吸音板と水平な下向きの吸音表面を
有する吸音板が２段に設置されたものである。下段の吸
音板により音の斜め方向成分を吸音し、残った鉛直方向
への直進成分を上段の吸音板で効果的に吸収、遮弊する
効果がある。図１１に示す構造は、内側が吸音表面とさ
れた一般的な防音壁と傾斜した下向きの吸音表面を有す
る吸音板を組み合わせたものである。図１２に示す構造
は、両面が吸音表面とされそれが鉛直方向に向く吸音板
が上下２段に設置され、各段の吸音板は水平方向に互い
に間隔をおき、上下の段でみると吸音板は千鳥配置とな
っている。この場合、同じ数の吸音板を１段に密に設置
するより、自然換気及び採光の点で有利となり、上段の
吸音板の下端と下段の吸音板の上端の間隔を空けるとさ
らにその傾向が強まる。In the structure shown in FIG. 9, a sound absorbing plate having an inclined downward sound absorbing surface and a sound absorbing plate having a horizontal downward sound absorbing surface are installed in two stages, and in each stage, each sound absorbing plate is horizontally spaced. It is installed in. Although it can be said that it is almost equivalent to the structure shown in FIG. 3, the installation area can be saved a little. The structure shown in FIG. 10 has a sound absorbing surface on both sides, a sound absorbing plate having a vertical direction and a sound absorbing plate having a horizontal downward sound absorbing surface. The lower sound absorbing plate absorbs the oblique component of the sound, and the remaining vertical component in the vertical direction is effectively absorbed and blocked by the upper sound absorbing plate. The structure shown in FIG. 11 is a combination of a general soundproof wall having a sound absorbing surface on the inside and a sound absorbing plate having an inclined downward sound absorbing surface. In the structure shown in FIG. 12, sound absorbing surfaces are provided on both sides, and sound absorbing plates which are vertically oriented are installed in two upper and lower stages. The sound absorbing plates in each stage are spaced apart from each other in the horizontal direction, and the sound absorbing surfaces are seen in the upper and lower stages. The boards are staggered. In this case, it is more advantageous in terms of natural ventilation and daylighting than installing the same number of sound absorbing plates densely in one step, and the tendency is further increased when a gap is provided between the lower end of the upper sound absorbing plate and the upper end of the lower sound absorbing plate. Strengthen.
【００１９】図１３に示す吸音板は上記の交通騒音の低
減構造に使用される吸音板の一例であり、例えばアルミ
押出形材からなる枠部材１１、表面を保護フィルムに覆
われた吸音材１２、例えばアルミ製のパンチングメタル
等からなり吸音材の前面及び両側面を覆う多孔板１３、
枠部材１１の上側の面（裏面の板）の内側に貼り付けら
れた制振材１４からなる。この吸音板では、上記枠部材
１１及び多孔板１３が吸音材１２を取り囲む中空の枠体
を構成する。枠部材１１の裏面の板には係止部１１ａが
形成され、ここに例えばボルトのヘッド等を嵌入させ、
堀割道路等の開口部に吊すことができるようにされてい
る。また、図１４に示す吸音板も似たような構造を持
ち、上側の面（裏面の板）が上に凸の曲面（円弧形）と
なった枠部材２１、吸音材２２、多孔板２３、制振材２
４からなる。この吸音板では、上記枠部材２１及び多孔
板２３が吸音材２２を取り囲む中空の枠体を構成する。
いずれの吸音板も下面と両側面の一部が吸音表面であ
り、堀割道路等の開口部に水平又は傾斜して設置され
る。A sound absorbing plate shown in FIG. 13 is an example of a sound absorbing plate used in the above-described structure for reducing traffic noise. For example, a frame member 11 made of extruded aluminum and a sound absorbing material 12 whose surface is covered with a protective film are shown. A perforated plate 13 made of, for example, aluminum punching metal and covering the front surface and both side surfaces of the sound absorbing material;
It is made of a vibration damping material 14 attached to the inside of the upper surface (back plate) of the frame member 11. In this sound absorbing plate, the frame member 11 and the perforated plate 13 constitute a hollow frame surrounding the sound absorbing material 12. An engagement portion 11a is formed on a plate on the back surface of the frame member 11, into which a head of a bolt, for example, is fitted.
It is designed so that it can be hung on an opening such as a moat road. The sound absorbing plate shown in FIG. 14 also has a similar structure, and has a frame member 21, a sound absorbing material 22, and a perforated plate 23 whose upper surface (back surface plate) has a curved surface (arc shape) convex upward. , Damping material 2
Consists of four. In this sound absorbing plate, the frame member 21 and the perforated plate 23 constitute a hollow frame surrounding the sound absorbing material 22.
Each sound absorbing plate has a sound absorbing surface on a lower surface and a part of both side surfaces, and is installed horizontally or inclined at an opening such as a trench road.
【００２０】これらの吸音板は、枠部材の上側の面（裏
面の板）が水平又は上に凸の曲面を有し、これがアルミ
のような金属であれば太陽光をよく反射し、多孔板もア
ルミのような金属であれば太陽光をよく反射する。従っ
て、図１５に示すように、例えば上下２段にこれらの吸
音板を設置したような場合、下段の吸音板の上側の面で
反射された太陽光が上段の吸音板の吸音表面（多孔板）
に反射され、両者の間で太陽光が散乱して下方の路上空
間へ光が導かれやすくなり、採光性の低下を補うことが
できる。あるいは、吸音板を多段に設置しない場合で
も、傾斜した（例えば図１参照）又は湾曲した上側の面
に太陽光が反射し、下方の路上空間へ光が導かれる。な
お、塗装などで背面の板の色を太陽光をよく反射する色
にしてもよい。また、枠部材の上側の面（裏面の板）が
水平面に対し傾斜又は上に湾曲していると、その面上を
水が流れやすいことから降雨時の排水に有利であり、付
着した汚れが雨水で除去されやすいという効果もある。
この場合、裏面の板（又は枠部材全体）の表面をフッ素
系樹脂等の親水性塗膜で被覆しておけば、さらに効果的
である。なお、上側の面が凸形状をもつものであれば、
例えば図１６（ａ）〜（ｃ）のように３角形状、台形状
等、平面的な凸形状をもつものでも、採光、排水等の面
で図１４の湾曲形状のものと同様の作用効果を有する。
さらに、図１３及び図１４に例示した吸音板のように、
裏面の板の内側に制振材を貼り付けた場合、その板の振
動が抑制され、例えば雨落下により発生する雨音の減音
作用が得られる。この作用は、裏面の板（又は枠部材全
体）として、それ自体で制振性を有する板材、例えば粘
弾性を示す制振樹脂を弾性板の間に挟んだサンドイッチ
制振板（例；鋼板やアルミ板でシート状の制振樹脂を挟
んだ制振鋼板や制振アルミ板）等を使用しても同様に得
ることができる。In these sound absorbing plates, the upper surface (back plate) of the frame member has a horizontal or upwardly convex curved surface. If this is a metal such as aluminum, it reflects sunlight well, and a perforated plate. Also, if it is a metal such as aluminum, it reflects sunlight well. Therefore, as shown in FIG. 15, for example, when these sound absorbing plates are installed in two upper and lower stages, sunlight reflected on the upper surface of the lower sound absorbing plate receives the sound absorbing surface of the upper sound absorbing plate (the perforated plate). )
And the sunlight is scattered between the two, so that the light is easily guided to the lower road space, thereby compensating for a decrease in the lighting property. Alternatively, even when the sound absorbing plates are not provided in multiple stages, the sunlight is reflected on the inclined (for example, see FIG. 1) or curved upper surface, and the light is guided to the lower road space. Note that the color of the back plate may be a color that reflects sunlight well by painting or the like. Further, when the upper surface (back plate) of the frame member is inclined or curved upward with respect to the horizontal plane, water flows easily on the surface, which is advantageous for drainage during rainfall, and adhered dirt is reduced. It also has the effect of being easily removed by rainwater.
In this case, it is more effective if the surface of the back plate (or the entire frame member) is covered with a hydrophilic coating film such as a fluororesin. If the upper surface has a convex shape,
For example, even in the case of a flat convex shape such as a triangular shape or a trapezoidal shape as shown in FIGS. 16 (a) to 16 (c), the same effects as those of the curved shape in FIG. Having.
Further, as in the sound absorbing plate illustrated in FIGS. 13 and 14,
When the damping material is adhered to the inside of the back plate, the vibration of the plate is suppressed, and a sound-reducing effect of, for example, a rain sound generated by rain fall is obtained. This action is achieved by a sandwich vibration damping plate (e.g., a steel plate or an aluminum plate) in which a plate material having a damping property itself, such as a viscoelastic damping resin, is sandwiched between elastic plates as a plate on the back surface (or the entire frame member). The same can be obtained by using a damping steel plate or a damping aluminum plate sandwiching a sheet-like damping resin.
【００２１】図１７に、吸音材を取り囲む中空の枠体の
一方の広面と他の面を吸音表面とした吸音板の他の例と
して、下向きの広面と両側の狭面（側面）を吸音表面と
した吸音板を示す。図１７（ａ）はその基本構造の一例
を示すもので、吸音材３２とそれを取り囲む中空矩形の
枠体からなり、この枠体は、吸音材３２の裏面側に配置
された板部材３１と、吸音材３２の前面側及び両側に配
置され板部材３１に固定された多孔板３３で構成され
る。なお、図１７（ａ）の吸音板では両側の狭面を吸音
表面としたが、図１７（ｂ）のように複数の吸音板を横
に接続して使用する場合には、狭面の吸音表面は両端の
吸音板にのみ要求されるから、このような場合、両端の
吸音板は広面と使用時に外側になる片面だけを吸音表面
とし、内側の吸音板は広面だけを吸音表面とすればよ
い。FIG. 17 shows another example of the sound absorbing plate in which one of the wide surface and the other surface of the hollow frame surrounding the sound absorbing material is a sound absorbing surface. Is shown. FIG. 17 (a) shows an example of the basic structure, which comprises a sound absorbing material 32 and a hollow rectangular frame surrounding the same, and this frame includes a plate member 31 arranged on the back side of the sound absorbing material 32. , A perforated plate 33 disposed on the front side and both sides of the sound absorbing material 32 and fixed to the plate member 31. In the sound absorbing plate of FIG. 17 (a), the narrow surfaces on both sides are sound absorbing surfaces. However, when a plurality of sound absorbing plates are connected side by side as shown in FIG. 17 (b), the sound absorbing surface of the narrow surface is used. Since the surface is only required for the sound-absorbing plates at both ends, in such a case, the sound-absorbing plates at both ends should have a wide surface and only one surface that will be outside when used, and the inner sound-absorbing plate should have only the wide surface as the sound absorbing surface. Good.
【００２２】先に図１３〜１４に示した吸音板と同じで
あるが、多孔板３３はパンチングメタルやエキスパンド
メタルなどからなり、アルミのほか、鋼板、ステンレス
鋼板などで形成すればよい。板部材３１も多孔板３３と
同様の素材で形成でき、例えば板材、アルミ押出材など
が利用できる。吸音材３２はグラスウール、ロックウー
ル、不織布等の繊維質吸音材が利用でき、雨水などから
の防水のためポリフッ化ビニルなどのフィルムで被覆し
てもよい。なお、繊維質以外の吸音材も利用できる。グ
ラスウールなどの繊維質吸音材を用いる場合、音源側に
かさ密度の小さい吸音材を配し、背後側にかさ密度の大
きい吸音材を配して密度勾配型の積層構造とすることで
騒音低減性能を向上させることができ、かさ密度３２ｋ
ｇ／ｍ３〜４８ｋｇ／ｍ３の吸音材を用いるのが望まし
い。また、吸音材３２の前面及び背面に空気層３４を設
けることでも騒音低減性能を向上せしめることができ、
その層厚は１０〜３０ｍｍとするのが望ましい。Although the sound absorbing plate is the same as the sound absorbing plate shown in FIGS. 13 and 14, the perforated plate 33 is made of a punched metal or an expanded metal, and may be made of aluminum, a steel plate, a stainless steel plate, or the like. The plate member 31 can also be formed of the same material as the perforated plate 33, for example, a plate material, an extruded aluminum material, or the like can be used. As the sound absorbing material 32, a fibrous sound absorbing material such as glass wool, rock wool, or nonwoven fabric can be used, and may be covered with a film such as polyvinyl fluoride for waterproofing against rainwater. It should be noted that sound absorbing materials other than fibrous materials can also be used. When using fibrous sound absorbing material such as glass wool, noise reduction performance is achieved by arranging a sound absorbing material with low bulk density on the sound source side and arranging a sound absorbing material with high bulk density on the back side to form a density gradient type laminated structure. Can be improved, and the bulk density is 32k
It is desirable to use a sound absorbing material of g / m 3 to 48 kg / m 3 . Also, the noise reduction performance can be improved by providing the air layer 34 on the front surface and the back surface of the sound absorbing material 32,
The layer thickness is desirably 10 to 30 mm.
【００２３】上記吸音板は、のちほど図１８〜図１９を
参照して具体的に説明するように、少なくとも吸音材と
該吸音材を取り囲む枠体からなり、前記枠体の一方の広
面と２つの狭面のうち少なくとも１面が吸音表面とされ
た吸音板において、吸音材が互いに別体の広面吸音材
（広面にのみ面する吸音材）と狭面吸音材（主として狭
面に面し、広面にも面する吸音材）からなり、それぞれ
枠体の内側に保持され、各吸音材の吸音表面側（吸音表
面を構成する多孔板に向く側）及び背面側に必要に応じ
て空気層が設けられている、あるいは吸音材が一体の
吸音材からなり、枠体の内側に保持され、同じく該吸音
材の吸音表面側（吸音表面を構成する多孔板に向く側）
及び背面側に必要に応じて空気層が設けられている、と
いうこともできる。なお、上記吸音板において、どの吸
音表面についても吸音材厚さが十分である、密度勾配型
の積層構造である、空気層と有効に組み合わされるなど
の手段により、どの吸音表面においてもほぼ同等の騒音
低減性能を実現することが望ましい。また、騒音低減性
能を損なわないために、吸音材の取付部材や保持部など
によって吸音材表面を塞ぐ面積はできるだけ小さくす
る、吸音材がフィルムで被覆されている場合は、フィル
ムの振動を拘束しないため、吸音材の取付部材や保持部
と吸音材との接触面積をなるべく小さくする、等の工夫
が望まれる。以下説明する図１８、１９の各例はこの要
求を満たすために工夫されたものである。As will be described in detail later with reference to FIGS. 18 to 19, the sound absorbing plate includes at least a sound absorbing material and a frame surrounding the sound absorbing material. In a sound absorbing plate in which at least one of the narrow surfaces is a sound absorbing surface, the sound absorbing materials are separate wide sound absorbing materials (sound absorbing materials facing only wide surfaces) and narrow sound absorbing materials (mainly narrow surfaces and wide surfaces). ), Each of which is held inside the frame, and air layers are provided as necessary on the sound absorbing surface side (the side facing the perforated plate forming the sound absorbing surface) and the back side of each sound absorbing material. Or the sound-absorbing material is made of an integral sound-absorbing material, held inside the frame, and also on the sound-absorbing surface side of the sound-absorbing material (the side facing the perforated plate constituting the sound absorbing surface)
It can also be said that an air layer is provided on the back side as necessary. In addition, in the above sound absorbing plate, the sound absorbing material thickness is sufficient for any sound absorbing surface, a density gradient type laminated structure, an effective combination with an air layer, etc., so that any sound absorbing surface has substantially the same thickness. It is desirable to achieve noise reduction performance. In addition, in order not to impair the noise reduction performance, the area that covers the surface of the sound absorbing material by the mounting member or the holding portion of the sound absorbing material is made as small as possible. When the sound absorbing material is covered with the film, the vibration of the film is not restricted. For this reason, it is desired to devise such measures as minimizing the contact area between the mounting member or the holding portion of the sound absorbing material and the sound absorbing material. Each of the examples shown in FIGS. 18 and 19 described below is devised to satisfy this requirement.
【００２４】図１８（ａ）に示す吸音板は、板部材４１
と多孔板４３からなる枠体と、その枠体に囲まれた吸音
材４２ａ、４２ｂからなり、板部材４１には、吸音板の
断面剛性を確保し、吸音材４２ａを保持するための保持
部４１ａが一体的に設けられている。この保持部４１ａ
（及び連結部４１ｂ）は例えばアルミ押出形材などで板
部材４１と一体成形してもよく、別体で成形したものを
一体に組み付けてもよい。広面を吸音するための吸音材
４２ａは板部材４１及び多孔板４３と空気層４４ａを隔
てて配置され、狭面を吸音するための吸音材４２ｂも板
部材４１及び多孔板４３と空気層４４ｂを隔てて配置さ
れる。このとき吸音材４２ｂは、騒音低減性能を損なわ
ないように、帯状又はワイヤ状の複数の取付部材４５で
間隔を置いて所々保持し、保持部４１ａにリベットやタ
ッピングネジで固定される。The sound absorbing plate shown in FIG.
And a sound absorbing member 42a, 42b surrounded by the frame member. The plate member 41 has a holding portion for securing the sectional rigidity of the sound absorbing plate and holding the sound absorbing member 42a. 41a are provided integrally. This holding part 41a
The (and the connecting portion 41b) may be integrally formed with the plate member 41 by, for example, an extruded aluminum member, or may be integrally formed by being formed separately. A sound absorbing material 42a for absorbing sound over a wide surface is disposed between the plate member 41 and the perforated plate 43 and the air layer 44a, and a sound absorbing material 42b for absorbing sound on a narrow surface is also provided on the plate member 41, the perforated plate 43 and the air layer 44b. It is arranged at a distance. At this time, the sound absorbing material 42b is held in places at intervals by a plurality of band-shaped or wire-shaped mounting members 45 so as not to impair the noise reduction performance, and is fixed to the holding portion 41a with rivets or tapping screws.
【００２５】図１８（ｂ）に示す吸音板は、板部材５１
と多孔板５３からなる枠体と、その枠体に囲まれた吸音
材５２ａ、５２ｂからなり、板部材５１には、吸音板の
断面剛性を確保し、かつ吸音材５２ａを保持する保持部
５１ａと吸音材５２ｂを保持する保持部５１ｃが一体的
に設けられている。この板部材５１でも、保持部５１ａ
（及び連結部５１ｂ）及び保持部５１ｃをアルミ押出形
材などで一体成形することができる。吸音材５２ａは板
部材５１及び多孔板５３と空気層５４ａを隔てて配置さ
れ、吸音材５２ｂは多孔板５３との間に空気層５４ｂを
隔てて配置され、かつその背面（保持部５１ａの側）に
も空気層５４ｂが設けられる。The sound absorbing plate shown in FIG.
And a sound absorbing material 52a, 52b surrounded by the frame, and the plate member 51 has a holding portion 51a that secures the sectional rigidity of the sound absorbing plate and holds the sound absorbing material 52a. And a holding portion 51c for holding the sound absorbing material 52b are provided integrally. This plate member 51 also has a holding portion 51a.
(And the connecting portion 51b) and the holding portion 51c can be integrally formed of an extruded aluminum material or the like. The sound absorbing material 52a is arranged with the air layer 54a interposed between the plate member 51 and the perforated plate 53, the sound absorbing material 52b is arranged with the air layer 54b interposed between the plate member 51 and the perforated plate 53, and the back surface thereof (the side of the holding portion 51a). ) Is also provided with an air layer 54b.
【００２６】図１９（ａ）に示す吸音板は、板部材６１
と多孔板６３からなる枠体と、その枠体に囲まれた吸音
材６２ａ、６２ｂからなり、板部材６１は図１８（ａ）
と基本的に同一で保持部６１ａが一体的に設けられてい
る。吸音材６２ｂは断面半円筒形をなし、円弧部が狭面
を向いて多孔板６３に支持され、平面部が保持部６１ａ
（及び連結部６１ｂ）に支持されるので、別途取付部材
や保持部を必要とすることなく、空気層６４ｂを確保し
枠体内に保持することができる。図１９（ｂ）に示す吸
音板は、狭面吸音のための新たな吸音材を配することな
く、一体の吸音材７２のみとしたものである。板部材７
１と多孔板７３が枠体を構成し、板部材７１には保持部
７１ａが一体的に設けられ、一方、保持部７１ｂは別体
であり、例えばこの吸音板の両端（紙面に垂直方向）で
支持され、吸音材７２はこの保持部７１ａ、７１ｂによ
り空気層７４ａを隔てて枠体内に配置される。なお、保
持部７１ａ、７１ｂは吸音材７２の端部（図でいえば吸
音材の左端）に設置されてもよい。The sound absorbing plate shown in FIG.
And a sound absorbing material 62a, 62b surrounded by the frame member and the perforated plate 63, and the plate member 61 is shown in FIG.
And a holding portion 61a is provided integrally. The sound absorbing material 62b has a semi-cylindrical cross section, the arc portion faces the narrow surface, is supported by the perforated plate 63, and the flat portion is the holding portion 61a.
(And the connecting portion 61b), the air layer 64b can be secured and held in the frame without the need for a separate mounting member or holding portion. The sound absorbing plate shown in FIG. 19 (b) has only the integrated sound absorbing material 72 without disposing a new sound absorbing material for sound absorption on the narrow surface. Plate member 7
1 and the perforated plate 73 constitute a frame body, and the plate member 71 is integrally provided with a holding portion 71a, while the holding portion 71b is a separate body, for example, both ends of this sound absorbing plate (in a direction perpendicular to the paper surface). The sound absorbing material 72 is disposed in the frame by the holding portions 71a and 71b with the air layer 74a therebetween. Note that the holding portions 71a and 71b may be installed at the end of the sound absorbing material 72 (in the drawing, the left end of the sound absorbing material).
【００２７】続いて、図２０〜図２２に、吸音板の吸音
表面が鉛直方向を向くように設置した場合と、水平方向
に向くように設置した場合の騒音の減衰効果の比較を、
数値シミュレーションで行った結果を示す。ここで、図
２０では高さｈ3：０．３ｍ、幅ｔ3：０．２ｍ、両側面
及び下面を吸音表面とした吸音板を等間隔で設置したも
のとし、図２１では高さｈ4：０．９ｍ、幅ｔ4：０．２
ｍ、両側面を吸音表面としたものとし、図２２では幅ｈ
5：１．５ｍ、厚みｔ5：０．１ｍ、下面のみ吸音表面と
した吸音板を水平方向に１ｍの間隔をおき、上下２段に
千鳥配置したものとし、その他の条件は図２６及び図２
７と同じとした。FIGS. 20 to 22 show a comparison of the noise attenuation effect between the case where the sound absorbing plate is installed so that the sound absorbing surface faces vertically and the case where the sound absorbing plate is installed so that it faces horizontally.
The result of a numerical simulation is shown. Here, in FIG. 20, a height h3: 0.3 m, a width t3: 0.2 m, sound absorbing plates having sound absorbing surfaces on both side surfaces and a lower surface are installed at equal intervals, and in FIG. 21, the height h4: 0. 9m, width t4: 0.2
m, both sides are sound absorbing surfaces, and in FIG.
5: 1.5 m, thickness t5: 0.1 m, sound absorbing plates having only a lower surface as a sound absorbing surface are spaced horizontally by 1 m, and are arranged in a staggered manner in two upper and lower stages.
Same as 7.
【００２８】図２０〜図２２の例では、断面における吸
音表面の長さはそれぞれ１２．８ｍ、１４．４ｍ、１
４．５ｍと、ほぼ同じくらいであったが、開口部から放
射される音波の広がり（音圧分布状態）をみると、本発
明に係る図２２の例が圧倒的に優れている。また、シミ
ュレーション結果による道路両側２５ｍ地点における平
均減音量（高さ０．２ｍ〜４０．２ｍ間の４１点での平
均減音量）は、左２５ｍ地点ではそれぞれ９．０ｄＢ、
８．４ｄＢ、１４．７ｄＢ、右２５ｍ地点ではそれぞれ
８．４ｄＢ、６．５ｄＢ、１４．８ｄＢであり、本発明
に係る図２２の効果量が他を上回っている。このシミュ
レーション結果によれば、同じ吸音表面積あるいは同じ
体積をもつ吸音板であっても、本発明の構造の方が優れ
た効果を奏することが分かる。In the examples of FIGS. 20 to 22, the lengths of the sound absorbing surfaces in cross sections are 12.8 m, 14.4 m, 1
Although it was almost the same as 4.5 m, the spread of the sound wave radiated from the opening (sound pressure distribution state) shows that the example of FIG. 22 according to the present invention is overwhelmingly excellent. The average sound reduction at the 25m point on both sides of the road (the average sound reduction at 41 points between the heights of 0.2m and 40.2m) according to the simulation results is 9.0dB at the left 25m point, respectively.
8.4 dB, 14.7 dB, and 8.4 dB, 6.5 dB, and 14.8 dB at the right 25 m point, respectively, and the effect amount of FIG. 22 according to the present invention is higher than the others. According to the simulation results, it is understood that the structure of the present invention has a more excellent effect even if the sound absorbing plates have the same sound absorbing surface area or the same volume.
【００２９】次に、吸音板を水平方向に互いに間隔を置
いて設置した場合について、吸音板の下向きに水平に向
いた広面のみを吸音表面としたときと、さらに他の面を
吸音表面としたときの騒音の低減効果を、これまでと同
じく公知の境界要素法による数値シミュレーションによ
って調べた。解析対称の掘割道路の構造は、図２３
（ａ）に示すように図２６の構造と同じとした（ただ
し、Ｈ３：１ｍ）。また、開口部に配置する吸音板の断
面サイズは図２２と同じとし、それぞれの水平方向の間
隔ｄは０．５ｍとし、吸音表面の吸音性能としては、建
設省で規定された斜入射吸音率で０．８８の性能を有す
る１面吸音（水平下向きの広面のみが吸音表面）又は３
面吸音（水平下向きの広面と鉛直の両狭面が吸音表面）
とし、これを図２３（ｂ）に示すように上下２段に配置
するものとした。そして、上下２段に配置した吸音板の
吸音板上端同士の距離（上下段間隔）ｃが０．３ｍの場
合と１．０ｍの場合に関して、１面吸音の吸音板を配置
した場合と３面吸音の吸音板を配置した場合の２種類の
場合の騒音低減効果の差異について検討した。Next, regarding the case where the sound absorbing plates are installed at a distance from each other in the horizontal direction, only the wide surface facing downward and horizontally is used as the sound absorbing surface, and the other surface is used as the sound absorbing surface. The noise reduction effect at that time was examined by a numerical simulation using the well-known boundary element method as in the past. Fig. 23 shows the structure of the anatomical cut road.
As shown in FIG. 26A, the structure was the same as that of FIG. 26 (however, H 3 : 1 m). The cross-sectional size of the sound absorbing plate placed in the opening is the same as in FIG. 22, the horizontal distance d is 0.5 m, and the sound absorbing performance of the sound absorbing surface is the oblique incidence sound absorbing coefficient specified by the Ministry of Construction. 1-sided sound absorption with a performance of 0.88 (only horizontal downward wide sound-absorbing surface) or 3
Surface sound absorption (horizontal downward wide surface and vertical narrow surface are sound absorbing surfaces)
These are arranged in two upper and lower stages as shown in FIG. When the distance c between the upper ends of the sound absorbing plates (upper and lower stages) c of the sound absorbing plates arranged in the upper and lower two stages is 0.3 m and 1.0 m, the case where the single sound absorbing sound absorbing plate is arranged and the case where The difference in the noise reduction effect between the two types of cases where a sound absorbing sound absorbing plate was arranged was examined.
【００３０】図２３（ａ）、（ｂ）に示すように、掘割
道路内のＳ１、Ｓ２を音源としたときの周囲における音
の大きさを求め、掘割道路断面形状がほぼ左右対称であ
ることを利用して、掘割内部の４車線を自動車が走行し
た場合に掘割内部の道路中心から２５ｍ地点における地
上高さ０．２ｍ〜４０．２ｍの範囲の騒音レベルを各場
合について算出し、開口部の対策がない場合と比較した
ときの騒音低減効果を求めた。その結果を図２３（ｃ）
に示す。図２３（ｃ）には、上下段間隔ｃが１．０ｍの
場合においても、０．３ｍの場合においても、３面吸音
板を使用した場合には、１面吸音板の場合に比べて３ｄ
Ｂ程度、騒音低減効果が増大することが示されている。
なお、３面吸音の場合は１面吸音の場合に比べて吸音表
面積は１．１３倍{(1.5×10＋0.1×20)／(1.5×10)}と
なり、単純に計算すれば吸音力の増加分としては＋0.5
ｄＢ(10log１０1.13)しか見込めないはずであるが、実
際には＋３ｄＢ程度の大きな騒音低減効果のアップが実
現されることが示されている。このように吸音表面積増
加分以上の効果が得られるのは、この吸音板配置では複
数の吸音板が間隔を開けて配置され、その隙間を通過す
る音波が、面積は小さくても隙間に面する部分を吸音表
面とすることにより効率よく吸音されるためである。As shown in FIGS. 23 (a) and 23 (b), the loudness of the surrounding sound when S1 and S2 in the cut road are used as the sound source is determined, and the cut road sectional shape is substantially symmetrical. , The noise level in the range of 0.2 m to 40.2 m above the ground at a point 25 m from the center of the road inside the cut is calculated for each case when the car travels on the four lanes inside the cut, The noise reduction effect compared to the case without the countermeasures was determined. The result is shown in FIG.
Shown in FIG. 23 (c) shows that when the three-sided sound absorbing plate is used regardless of whether the upper-lower interval c is 1.0 m or 0.3 m, 3d is larger than that of the one-sided sound absorbing plate.
It is shown that the noise reduction effect increases by about B.
In the case of three-sided sound absorption, the sound absorbing surface area is 1.13 times {(1.5 × 10 + 0.1 × 20) / (1.5 × 10)} as compared with the case of single-sided sound absorption. +0.5 for increase
Although only dB ( 10 log 10 1.13) should be expected, it is shown that a large noise reduction effect of about +3 dB is actually achieved. As described above, the effect of increasing the sound absorbing surface area or more is obtained because in this sound absorbing plate arrangement, a plurality of sound absorbing plates are arranged at intervals, and sound waves passing through the gap face the gap even if the area is small. This is because sound is efficiently absorbed by making the portion a sound absorbing surface.
【００３１】上記のように、この吸音板配置において、
３面吸音の場合は１面吸音と比較して騒音低減効果は３
ｄＢ程度増大することが明らかになった。しかし、この
騒音低減効果は吸音板の間隔ｄによって変化することが
考えられる。そこで、次は間隔ｄを変えたときの騒音低
減効果の差異を検討するため、堀割道路から外部に放射
される騒音のエネルギーを評価することとし、道路進行
方向に並行な断面について以下のような検討を行った。
解析対称の掘割道路の構造は、図２３（ａ）と同じと
し、開口部に配置する吸音板の断面サイズは図２３
（ｂ）と同じとし、この吸音板を道路進行方向に垂直に
上下２段（上下段間隔：１ｍ）に配置するものとし、ま
た吸音表面の吸音性能としては、建設省で規定された斜
入射吸音率で０．８８の性能を有する１面吸音（水平下
向きの広面のみが吸音表面）又は３面吸音（水平下向き
の広面と鉛直の両狭面が吸音表面）とした。そして、吸
音板同士の水平方向の間隔が０．５ｍの場合と１．０ｍ
の場合に関して、１面吸音の吸音板を配置した場合と３
面吸音の吸音板を配置した場合の２種類の場合の騒音低
減効果の差異について検討した。As described above, in this sound absorbing plate arrangement,
In the case of three-sided sound absorption, the noise reduction effect is 3 compared to the one-sided sound absorption.
It was found that the increase was about dB. However, it is conceivable that this noise reduction effect changes depending on the distance d between the sound absorbing plates. Therefore, next, in order to examine the difference in the noise reduction effect when the distance d is changed, the energy of the noise radiated from the moat road to the outside will be evaluated. Study was carried out.
The structure of the anatomical cut road is the same as that shown in FIG.
Same as (b), this sound absorbing plate shall be arranged vertically two steps (up and down steps: 1 m) perpendicular to the traveling direction of the road, and the sound absorbing performance of the sound absorbing surface shall be oblique incidence specified by the Ministry of Construction. One-sided sound absorption having a performance of 0.88 in terms of sound absorption coefficient (only the horizontal downward wide surface has a sound absorbing surface) or three-sided sound absorption (horizontal downward wide surface and both vertical narrow surfaces are sound absorbing surfaces). The horizontal distance between the sound absorbing plates is 0.5 m and 1.0 m.
In the case of (1), the case where a sound absorbing plate of one-side sound absorption is arranged and the case of
The difference in the noise reduction effect between the two cases where the surface sound absorbing plate was arranged was examined.
【００３２】堀割道路の進行方向並行断面は図２４
（ａ）のようになっており、ほぼ一定間隔を置いて横梁
８１が設置されている。そこで一本の横梁から隣の横梁
までの１ピッチ分を取り出した（ｂ）に示すようなモデ
ルを考えると、１ピッチ分から外部に放射される騒音全
体のパワーはモデル上部の水平面を通過するパワーを積
分することによって評価できる。この考え方に基づいて
これまでと同じく公知の境界要素法による数値シミュレ
ーションを行い、各場合の騒音低減効果の差異について
検討した。シミュレーション結果から得た数値（水平方
向の間隔が０．５ｍで、１面吸音の吸音板を配置した場
合を基準＝０ｄＢとした、相対的な騒音低減効果）を表
１に示す。FIG. 24 shows a cross section parallel to the traveling direction of the moat road.
(A), and the cross beams 81 are installed at substantially constant intervals. Therefore, considering a model as shown in (b) in which one pitch from one cross beam to the next cross beam is extracted, the total power of noise radiated to the outside from one pitch is the power passing through the horizontal plane above the model. Can be evaluated by integrating. Based on this concept, a numerical simulation was performed by the well-known boundary element method as in the past, and differences in the noise reduction effect in each case were examined. Table 1 shows numerical values obtained from the simulation results (relative noise reduction effect when the horizontal interval is 0.5 m and the sound absorbing plate with one-sided sound absorption is set as a reference = 0 dB).
【００３３】[0033]
【表１】 [Table 1]
【００３４】表１から、３面吸音の場合の騒音低減効果
は１面吸音の場合と比べて、吸音板の水平方向間隔が
０．５ｍの場合は＋３．１ｄＢ、１．０ｍの場合は＋
０．６ｄＢであり、水平方向間隔によって大きく変化す
る。なお、この水平方向間隔が０．５ｍの場合の＋３．
１ｄＢという数値は、図２３（ｃ）で見られた＋３ｄＢ
程度という数値とほぼ一致する。ここで得られたデータ
について、縦軸を騒音低減効果、横軸を相対間隔（吸音
板の水平方向間隔と吸音板の幅の比）としてグラフ化し
たものが図２５であり、相対間隔が小さいほど騒音低減
効果が大きく、３面吸音により少なくとも１ｄＢ以上の
有意な騒音低減効果を得るためには相対間隔を０．６以
下にすればよいことが分かる。少なくとも標準的と考え
られる吸音板断面サイズ（厚さ：80〜200ｍｍ）、配置
形態（上下段間隔：50〜200ｃｍ）であれば、相対間隔
について同様の結果が得られる。From Table 1, it can be seen that the noise reduction effect in the case of three-sided sound absorption is +3.1 dB when the horizontal spacing of the sound absorbing plates is 0.5 m and + in the case of 1.0 m, as compared with the case of single-sided sound absorption.
0.6 dB, which greatly varies depending on the horizontal interval. In addition, +3. When this horizontal distance is 0.5 m.
The numerical value of 1 dB is +3 dB shown in FIG.
It almost matches the numerical value of degree. FIG. 25 is a graph of the obtained data, in which the vertical axis represents the noise reduction effect and the horizontal axis represents the relative interval (ratio between the horizontal direction of the sound absorbing plate and the width of the sound absorbing plate). It can be seen that the greater the noise reduction effect is, the greater the noise reduction effect is at least 1 dB or more due to the three-sided sound absorption. A similar result can be obtained with respect to the relative spacing as long as the section size (thickness: 80 to 200 mm) and the arrangement form (upper and lower steps: 50 to 200 cm) are considered to be at least standard.
【００３５】[0035]
【発明の効果】本発明によれば、両側が壁で上部に開口
を有する道路又は鉄道において、開口部から上方に放射
される交通騒音を低減し、経済的であり、かつ自然の換
気や採光を大きく阻害しない交通騒音の低減構造を得る
ことができる。According to the present invention, traffic noise radiated upward from an opening is reduced on a road or railroad having an opening at the top with walls on both sides, which is economical and allows natural ventilation and daylighting. A traffic noise reduction structure that does not significantly hinder traffic can be obtained.
【図１】 本発明に係る交通騒音の低減構造の例を堀割
道路の長手方向に垂直な断面で示すものである。FIG. 1 shows an example of a traffic noise reduction structure according to the present invention in a cross section perpendicular to the longitudinal direction of a trench road.
【図２】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 2 is another example of the traffic noise reduction structure according to the present invention.
【図３】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 3 is another example of the traffic noise reduction structure according to the present invention.
【図４】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 4 is another example of the traffic noise reduction structure according to the present invention.
【図５】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 5 is another example of the traffic noise reduction structure according to the present invention.
【図６】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 6 is another example of the traffic noise reduction structure according to the present invention.
【図７】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 7 is another example of the traffic noise reduction structure according to the present invention.
【図８】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 8 is another example of the traffic noise reduction structure according to the present invention.
【図９】 本発明に係る交通騒音の低減構造の別の例で
ある。FIG. 9 is another example of the traffic noise reduction structure according to the present invention.
【図１０】 本発明に係る交通騒音の低減構造の別の例
である。FIG. 10 is another example of the traffic noise reduction structure according to the present invention.
【図１１】 本発明に係る交通騒音の低減構造の別の例
である。FIG. 11 is another example of the traffic noise reduction structure according to the present invention.
【図１２】 本発明に係る交通騒音の低減構造の別の例
である。FIG. 12 is another example of the traffic noise reduction structure according to the present invention.
【図１３】 本発明に係る吸音板の断面図である。FIG. 13 is a sectional view of a sound absorbing plate according to the present invention.
【図１４】 本発明に係る吸音板の断面図である。FIG. 14 is a sectional view of a sound absorbing plate according to the present invention.
【図１５】 吸音板による太陽光の反射を説明する図で
ある。FIG. 15 is a diagram illustrating the reflection of sunlight by a sound absorbing plate.
【図１６】 本発明に係る吸音板の断面を模式的に示す
図である。FIG. 16 is a diagram schematically showing a cross section of the sound absorbing plate according to the present invention.
【図１７】 本発明に係る吸音板の断面を模式的に示す
図である。FIG. 17 is a diagram schematically showing a cross section of the sound absorbing plate according to the present invention.
【図１８】 その具体的構造を示す図である。FIG. 18 is a diagram showing a specific structure thereof.
【図１９】 同じくその具体的構造を示す図である。FIG. 19 is a view showing a specific structure of the same.
【図２０】 比較例の構造における音圧分布状態のシミ
ュレーション結果を示す図である。FIG. 20 is a diagram showing a simulation result of a sound pressure distribution state in the structure of the comparative example.
【図２１】 比較例の構造における音圧分布状態のシミ
ュレーション結果を示す図である。FIG. 21 is a diagram showing a simulation result of a sound pressure distribution state in the structure of the comparative example.
【図２２】 本発明の構造における音圧分布状態のシミ
ュレーション結果を示す図である。FIG. 22 is a diagram showing a simulation result of a sound pressure distribution state in the structure of the present invention.
【図２３】 吸音板を水平２段に配置した場合につい
て、３面吸音の場合と１面吸音の場合の騒音低減効果の
シミュレーション結果を示す図である。FIG. 23 is a diagram showing a simulation result of a noise reduction effect in the case of three-sided sound absorption and the case of one-sided sound absorption when the sound absorbing plates are arranged in two horizontal stages.
【図２４】 吸音板を水平２段に配置した場合につい
て、３面吸音の場合と１面吸音の場合の騒音低減効果を
数値シミュレーションで評価する際の前提条件を説明す
る図である。FIG. 24 is a diagram illustrating preconditions for evaluating the noise reduction effect in the case of three-sided sound absorption and the case of one-sided sound absorption by numerical simulation when the sound absorbing plates are arranged in two horizontal stages.
【図２５】 その数値シミュレーション結果を示す図で
ある。FIG. 25 is a diagram showing a result of the numerical simulation.
【図２６】 従来構造における音圧分布状態のシミュレ
ーション結果を示す図である。FIG. 26 is a diagram showing a simulation result of a sound pressure distribution state in a conventional structure.
【図２７】 比較例の構造における音圧分布状態のシミ
ュレーション結果を示す図である。FIG. 27 is a diagram showing a simulation result of a sound pressure distribution state in the structure of the comparative example.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木下 伸一 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所神戸総合技術研究所内 (72)発明者 岩井 健治 東京都千代田区丸の内１丁目８番２号 株 式会社神戸製鋼所東京本社内 (72)発明者 箕浦 忠行 東京都千代田区丸の内１丁目８番２号 株 式会社神戸製鋼所東京本社内 (72)発明者 荒金 秀生 東京都千代田区丸の内１丁目８番２号 株 式会社神戸製鋼所東京本社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichi Kinoshita 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Research Institute, Kobe Steel Ltd. (72) Inventor Kenji Iwai 1 Marunouchi, Chiyoda-ku, Tokyo Kobe Steel Co., Ltd. Tokyo headquarters, No. 8-2 Co., Ltd. (72) Inventor Tadayuki Minoura 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Co., Ltd. Kobe Steel Co., Ltd., Tokyo headquarters (72) Inventor Hideo Araga, Tokyo Kobe Steel, Ltd. Tokyo Head Office, 1-8-2 Marunouchi, Chiyoda-ku
Claims (18)
鉄道における交通騒音の低減構造であって、開口部に傾
斜した下向きの吸音表面を有する複数の吸音板が互いに
間隔をおいて設置されていることを特徴とする上方に放
射される交通騒音の低減構造。1. A traffic noise reduction structure for a road or railroad having a wall on both sides and an opening at an upper part, wherein a plurality of sound absorbing plates having a downward sound absorbing surface inclined at the opening are installed at intervals. A structure for reducing traffic noise radiated upward.
音表面を有することを特徴とする請求項１に記載された
上方に放射される交通騒音の低減構造。2. The structure as claimed in claim 1, wherein the sound absorbing plate further has an inclined upward sound absorbing surface.
沿って設置されていることを特徴とする請求項１又は２
に記載された上方に放射される交通騒音の低減構造。3. The sound absorbing plate according to claim 1, wherein the sound absorbing plate is installed along an extension direction of a road or a railway.
The structure for reducing traffic noise radiated upward as described in (1).
ることを特徴とする請求項１〜３のいずれかに記載され
た上方に放射される交通騒音の低減構造。4. The structure for reducing traffic noise radiated upwards according to claim 1, wherein the sound absorbing plates are provided in a plurality of stages vertically.
か又は一部重なり合うようにされたことを特徴とする請
求項１〜４のいずれかに記載された上方へ放射される交
通騒音の低減構造。5. The traffic noise emitted upward as claimed in claim 1, wherein the vertical projection of each sound absorbing plate is substantially tangent or partially overlapped. Reduction structure.
鉄道における交通騒音の低減構造であって、道路又は鉄
道の延長方向に垂直な断面をみたとき、開口部に水平な
下向きの吸音表面を有する複数の吸音板が互いに間隔を
おいて設置されていることを特徴とする上方へ放射され
る交通騒音の低減構造。6. A structure for reducing traffic noise in a road or railroad having walls on both sides and an opening at an upper part, wherein a downward sound absorbing surface horizontal to the opening when viewed in a cross section perpendicular to the direction of extension of the road or railroad. A structure for reducing traffic noise radiated upward, wherein a plurality of sound absorbing plates having the following are installed at intervals.
ることを特徴とする請求項６に記載された上方に放射さ
れる交通騒音の低減構造。7. The structure for reducing traffic noise radiated upward according to claim 6, wherein the sound absorbing plates are provided in a plurality of stages vertically.
鉄道における交通騒音の低減構造であって、開口部に水
平な下向きの吸音表面を有する複数の吸音板が互いに間
隔をおき、かつ上下に複数段設置されていることを特徴
とする上方へ放射される交通騒音の低減構造。8. A structure for reducing traffic noise in a road or railroad having walls on both sides and an opening at an upper part, wherein a plurality of sound absorbing plates having a horizontal downward sound absorbing surface at the opening are spaced apart from each other, and A structure for reducing traffic noise radiated upward, characterized by being installed in multiple stages.
有することを特徴とする請求項７又は８に記載された上
方に放射される交通騒音の低減構造。9. The structure for reducing upwardly radiated traffic noise according to claim 7, wherein the sound absorbing plate further has an upward sound absorbing surface.
に沿って設置されていることを特徴とする請求項６〜９
のいずれかに記載された上方に放射される交通騒音の低
減構造。10. The sound absorbing plate according to claim 6, wherein the sound absorbing plate is installed along an extension direction of a road or a railway.
The structure for reducing traffic noise radiated upward as described in any one of the above.
するか又は一部重なり合うようにされたことを特徴とす
る請求項７〜１０のいずれかに記載された上方へ放射さ
れる交通騒音の低減構造。11. The traffic noise emitted upward as claimed in claim 7, wherein the projections of the sound absorbing plate in the vertical direction are substantially in contact with each other or partially overlap each other. Reduction structure.
む枠体からなり、前記枠体の少なくとも２面が吸音表面
とされたことを特徴とする請求項１〜１１のいずれかに
記載された交通騒音の低減構造に使用される吸音板。12. The traffic according to claim 1, comprising at least a sound absorbing material and a frame surrounding the sound absorbing material, wherein at least two surfaces of the frame are sound absorbing surfaces. Sound absorption plate used for noise reduction structure.
も１面が吸音表面とされたことを特徴とする請求項１２
に記載された交通騒音の低減構造に使用される吸音板。13. The sound absorbing surface of one of the wide surface and at least one other surface of the frame body.
A sound absorbing plate used in the traffic noise reduction structure described in (1).
する材質又は色であることを特徴とする請求項１〜１１
のいずれかに記載された交通騒音の低減構造に使用され
る吸音板。14. The sound absorbing plate according to claim 1, wherein the surface on the back side is made of a material or color that reflects sunlight.
A sound absorbing plate used in the traffic noise reducing structure described in any one of the above.
形状をもつことを特徴とする請求項１〜１１のいずれか
に記載された交通騒音の低減構造に使用される吸音板。15. The sound absorbing plate used in the traffic noise reduction structure according to claim 1, wherein the rear surface has a flat or upwardly convex shape.
を貼り付けるか、裏面の板自体を制振性を有する板材で
構成することを特徴とする請求項１〜１１のいずれかに
記載された交通騒音の低減構造に使用される吸音板。16. The vibration damping material is stuck to the inside of a plate covering the back surface of the sound absorbing material, or the back plate itself is made of a plate material having a vibration damping property. A sound absorbing plate used in the traffic noise reduction structure described in (1).
は鉄道における交通騒音の低減構造であって、道路又は
鉄道の延長方向に垂直な断面をみたとき、上部開口部に
鉛直な吸音表面を有する複数の吸音板が水平方向に互い
に間隔をおいて、かつ上下複数段に設置され、さらに、
上下の吸音板の水平方向位置がずらされていることを特
徴とする上方へ放射される交通騒音の低減構造。17. A structure for reducing traffic noise in a road or railroad having walls on both sides and having an opening at an upper part, wherein a vertical sound absorbing surface is formed in the upper opening when a cross section perpendicular to the direction of extension of the road or railroad is viewed. A plurality of sound absorbing plates having a horizontal spacing and spaced from each other, and installed in a plurality of upper and lower stages,
A structure for reducing traffic noise radiated upward, wherein horizontal positions of upper and lower sound absorbing plates are shifted.
む枠体からなり、前記枠体の鉛直な面と他の少なくとも
１面が吸音表面とされたことを特徴とする請求項１７に
記載された交通騒音の低減構造に使用される吸音板。18. The apparatus according to claim 17, comprising at least a sound absorbing material and a frame surrounding the sound absorbing material, wherein a vertical surface and at least one other surface of the frame are sound absorbing surfaces. Sound absorbing plate used for traffic noise reduction structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11708399A JP3658644B2 (en) | 1998-04-23 | 1999-04-23 | Reduction structure of traffic noise radiated upward |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-114001 | 1998-04-23 | ||
| JP11400198 | 1998-04-23 | ||
| JP11708399A JP3658644B2 (en) | 1998-04-23 | 1999-04-23 | Reduction structure of traffic noise radiated upward |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000008333A true JP2000008333A (en) | 2000-01-11 |
| JP3658644B2 JP3658644B2 (en) | 2005-06-08 |
Family
ID=26452860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11708399A Expired - Lifetime JP3658644B2 (en) | 1998-04-23 | 1999-04-23 | Reduction structure of traffic noise radiated upward |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3658644B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003150170A (en) * | 2001-11-09 | 2003-05-23 | Showa Electric Wire & Cable Co Ltd | Sound absorbing and vibration damping material |
| JP2012207509A (en) * | 2011-03-30 | 2012-10-25 | East Japan Railway Co | Soundproof wall for railroad |
| CN112365872A (en) * | 2020-11-10 | 2021-02-12 | 国网北京市电力公司 | Noise reduction regulation and control method, device and system and processor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101044368B1 (en) | 2009-03-13 | 2011-06-29 | 퓨어텍인터내셔날 (주) | Soundproof structure for noise reduction |
-
1999
- 1999-04-23 JP JP11708399A patent/JP3658644B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003150170A (en) * | 2001-11-09 | 2003-05-23 | Showa Electric Wire & Cable Co Ltd | Sound absorbing and vibration damping material |
| JP2012207509A (en) * | 2011-03-30 | 2012-10-25 | East Japan Railway Co | Soundproof wall for railroad |
| CN112365872A (en) * | 2020-11-10 | 2021-02-12 | 国网北京市电力公司 | Noise reduction regulation and control method, device and system and processor |
| CN112365872B (en) * | 2020-11-10 | 2024-05-28 | 国网北京市电力公司 | Noise reduction regulation method, device and system and processor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3658644B2 (en) | 2005-06-08 |
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