JP5219448B2 - Sound barrier - Google Patents

Description

  The present invention relates to a soundproof wall that can be reduced in height and has good sound insulation performance.

As a soundproof wall for preventing noise at a construction site, a soundproof wall constructed by covering a sound absorbing material such as glass wool or rock wool with a sheet is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 9-1111912

However, when the above soundproof wall is installed, the sound from the sound generation source gets over the top of the soundproof wall, so it is necessary to increase the height of the soundproof wall in order to improve the soundproofing effect. When the height is increased, there is a problem that the soundproof wall easily falls down due to wind.
The present invention has been made in view of the above problems, and provides a soundproof wall that can be lowered in height so that it is not easily collapsed by wind or the like and has good sound insulation performance even when the height is lowered.

The soundproof wall of the present invention includes a wall body, and a sound absorber made of a cylindrical body that is attached to the upper end of the wall body and forms a space outside the wall body . The sound absorber includes the outer sound absorber and the outer side. An inner sound absorber provided on the inner side of the sound absorber, and the outer sound absorber and the inner sound absorber each have a through-hole penetrating the outer surface and the inner surface of the cylindrical body across one end and the other end of the cylindrical body. The upper end of the wall is outside so that a space is formed between the inside of the inner sound absorber and between the inner and outer sound absorbers. It is located inside the cylindrical body of the inner sound absorber via the slit of the cylindrical body of the sound absorber and the slit of the cylindrical body of the inner sound absorber, and both wall surfaces of the upper end portion of the wall body are cylindrical of the outer sound absorber. The outer sound absorber and the inner sound absorber are sandwiched between the slit of the body and the slit of the cylindrical body of the inner sound absorber. Provided at the upper end of the wall along the upper edge of the wall, and formed so that the upper end of the wall positioned inside the inner sound absorber and the inner surface of the cylindrical body of the inner sound absorber do not contact Thus, a space is formed between the inner surface of the cylindrical body forming the inner sound absorber and the upper end of the wall body, and the outer surface of the outer sound absorber is covered with a covering material .
The wall body is also provided with side wall bodies at left and right ends, respectively, and the left and right side wall bodies are provided so as to face each other.
The inner sound absorber and the outer sound absorber may have a circular cross-sectional shape.

According to the present invention, the sound absorber includes a wall body and a sound absorber made of a cylindrical body that is attached to the upper end portion of the wall body and forms a space outside the wall body. The sound absorber includes the outer sound absorber and the outer sound absorber. An inner sound absorber provided on the inner side of the body, and the outer sound absorber and the inner sound absorber each have a through-hole penetrating the outer surface and the inner surface of the cylinder across one end and the other end of the cylinder. The upper end of the wall is formed by a cylindrical body with a linearly extending slit so that a space is formed between the inner sound absorber and between the inner sound absorber and the outer sound absorber. The cylindrical body of the outer sound absorber is located inside the cylindrical body of the inner sound absorber through the slit of the cylindrical body of the body and the slit of the cylindrical body of the inner sound absorber. Between the outer sound absorber and the inner sound absorber. Provided at the upper end of the wall along the upper edge of the body and formed so that the upper end of the wall located inside the inner sound absorber and the inner surface of the cylindrical body of the inner sound absorber do not contact Thus, a soundproof wall is formed in which a space is formed between the inner surface of the cylindrical body forming the inner sound absorber and the upper end portion of the wall body, and the outer surface of the outer sound absorber is covered with a covering material. Therefore, it is possible to obtain a soundproof wall with good sound insulation performance even when the height is lowered and the outer sound absorber and the inner sound absorber are equipped with slits so that they can be lowered so that they are not easily collapsed by the wind. And a soundproof wall that can be easily disassembled, and the upper end of the wall body is positioned inside the cylindrical body via the slits of the cylindrical body of the outer sound absorbing body and the inner sound absorbing body, so that the wall is in contact with the space. Since the wall surface area of the body increases and the impact of sound on the wall surface increases, the sound insulation performance improves , and the upper end of the wall body located inside the inner sound absorber and the inner surface of the cylindrical body of the inner sound absorber Since it is formed so that it does not touch, the number of contact parts that become secondary sound sources can be reduced, the sound insulation performance is improved, and the outer surface of the outer sound absorber is covered with a covering material, so that the sound absorber is scattered by rain or strong winds Can be prevented. In particular, since it is configured to include a double-cylinder sound absorber with an inner sound absorber and an outer sound absorber, and a space is formed between the inner sound absorber and the inner and outer sound absorbers, The sound insulation performance is improved by the plurality of sound absorbers and the space.
Since the wall body is provided with the side wall bodies at the left and right ends, respectively, it is possible to shorten the lateral length of the wall body and obtain a soundproof wall with good sound insulation performance.
Since the inner and outer sound absorber cylinders have a circular cross-sectional shape, the sound from the sound source is absorbed and attenuated by the sound absorber when traveling along the circular outer surface of the sound absorber during diffraction. Will improve.

Best form 1
1 to 3 show the best mode 1, FIG. 1 shows a soundproof wall, FIG. 2 shows a sound absorber, and FIG. 3 shows a cross section of the superstructure of the soundproof wall.

  As shown in FIG. 1, the soundproof wall 1 includes a wall body 2 and a sound absorbing body 3. The sound absorber 3 is formed of a porous sound absorbing material such as glass wool, rock wool, or nonwoven fabric. As shown in FIG. 2, the sound absorber 3 is formed in a cylindrical body having a slit 4 on a cylindrical wall of the cylinder. The thickness t of the cylindrical body having a circular cross section forming the sound absorbing body 3 is preferably about 50 mm. The slit 4 is formed by a continuous hole in which a through hole extending between the inner peripheral surface and the outer peripheral surface of the cylinder extends along one end and the other end of the cylinder along the center of the cylinder. In other words, the sound absorber 3 is formed by a space between the cutting surfaces facing each other and cutting the cylinder so as to extend along one end and the other end of the cylinder along the center of the cylinder. The slit 4 is provided. The pair of opposing cut surfaces form both end surface 5; 5 in the direction along the circumference of the cylindrical body of the sound absorber 3.

  As shown in FIG. 3, the upper end 6 of the wall 2 is positioned from the outside of the slit 4 of the sound absorber 3 to the inner side of the sound absorber 3 via the slit 4, and both wall surfaces 7 of the upper end 6 of the wall 2. The sound-absorbing wall 1 is formed by attaching the sound-absorbing body 3 to the upper end portion 6 of the wall body 2 so that 7 is sandwiched between the two edge surfaces 5; 5 of the sound-absorbing body 3. Thus, a partition is formed between the upper surface 6 of the wall body 2 and the inner surface 8 of the cylindrical body of the sound absorbing body between the inner surface 8 of the cylindrical body forming the sound absorbing body 3 and the upper end portion 6 of the wall body 2. The soundproof wall 1 having the space 10 is provided. That is, the sound absorbing body 3 is attached to the upper end portion 6 of the wall body 2 to form a space 10 outside the wall body 2.

  For example, both wall surfaces 7 of the upper end 6 of the wall 2 are arranged so that the upper end 6 of the wall 2 positioned inside the sound absorber 3 and the inner surface 8 of the cylindrical body of the sound absorber 3 are not in contact with each other. 7 and the edge surfaces 5 of both of the sound absorbing bodies 3 are bonded to each other by an adhesive, whereby the wall body 2 and the upper end portion 6 of the sound absorbing body 3 are attached to each other. That is, the soundproof wall 1 is formed so that the upper end portion 6 of the wall body 2 positioned inside the sound absorber 3 and the inner surface 8 of the cylindrical body of the sound absorber 3 do not contact each other.

  According to the soundproof wall 1 of the best mode 1, since the sound absorbing body 3 is attached to the upper end portion 6 of the wall body 2 and the sound absorbing body 3 is formed by a cylindrical body having a circular cross section, When the sound travels along the circular outer surface of the sound absorber 3 during diffraction, the sound absorber 3 absorbs the sound and attenuates it, so that the sound insulation performance is improved. Further, since the sound absorber 3 is attached to the upper end portion 6 of the wall body 2, the space 10 is formed outside the wall body 2, so that the sound is absorbed by the sound absorber 3 when the sound passes through the sound absorber 3. The sound is absorbed and attenuated, and the sound collides with the sound absorber 3 when the sound enters the sound absorber 3 from the outside of the sound absorber 3. The sound passes through the sound absorber 3 and enters the space 10 inside the sound absorber 3. Collision between the sound and the air, collision between the sound and the upper end 6 of the wall 2, collision between the sound and the sound absorber 3 when the sound enters the sound absorber 3 from the space 10, and sound absorption from the sound absorber 3 Since the sound is attenuated by the collision of the sound and the air when going outside the body 3, the sound insulation performance is improved. That is, since the sound absorber 3, the space 10, and the upper end portion 6 of the wall body 2 located in the space 10 are provided, the sound insulation performance is improved by the sound absorption by the sound absorber and the attenuation due to the sound collision. According to the soundproof wall 1 provided with the sound absorber 3, the sound insulation performance is improved by about 3 dB as compared with the soundproof wall not provided with the sound absorber 3, and is equivalent to the case where the sound barrier without the sound absorber 3 is changed from 6 m to 8 m. The effect of was obtained. That is, the height of the soundproof wall 1 can be reduced so that it is not easily collapsed by wind or the like, and the sound insulation performance is good even if the height is lowered.

  According to the soundproof wall 1 of the best mode 1, the sound absorber 3 is provided with the slit 4, the upper end 6 of the wall 2 is passed through the slit 4, and both wall surfaces 7; 7 of the upper end 6 of the wall 2 are the sound absorber. Since the sound absorber 3 is attached to the upper end portion 6 of the wall 2 so as to be sandwiched between the two edge surfaces 5; 5, the soundproof wall 1 that can be easily assembled and disassembled can be provided.

  The soundproof wall 1 of the best mode 1 is provided between the sound generation source 11 and the sound aversion part 12, as shown in FIG. The soundproof wall 1 is easy to assemble and dismantle, and is suitable as a soundproof wall when used as a temporary soundproof wall at a construction site. In this case, the soundproof wall 1 is temporarily installed between the sound generation source 11 at the construction site and the sound aversion part 12 such as a private house that dislikes the construction sound, and is demolished and removed after the construction is completed. .

According to the soundproof wall 1 of the best mode 1, since the upper end portion 6 of the wall body 2 located inside the sound absorber 3 and the inner surface 8 of the cylindrical body of the sound absorber 3 are not in contact with each other, The number of contact parts that become secondary sound sources can be reduced, and the sound insulation performance is improved.
In addition, since the space 10 on both sides of both wall surfaces 7; 7 of the upper end portion 6 becomes larger as the length H at which the upper end portion 6 of the wall body 2 protrudes to the inside of the sound absorbing body 3, the sound insulation performance is improved. To do. In other words, since the area of the wall surface 7 in contact with the space 10 is increased, sound collision with the wall surface 7 is increased, so that the sound insulation performance is improved.
The upper edge 15 of the wall surface 7 of the upper end 6 of the wall body 2 and the inner surface 8 of the cylindrical body of the sound absorbing body 3 may be brought into contact with each other. In this case, the mounting stability of the sound absorber 3 is improved, but the contact portion becomes a secondary sound source, so that the sound insulation performance is deteriorated as compared with the soundproof wall 1 shown in FIG.

Best form 2
As shown in FIG. 4, it is good also as the sound barrier 1 of the structure by which the outer surface 9 of the sound-absorbing body 3 was covered with the coating | covering materials 16 like a poly film sheet or a vinyl sheet. The covering material 16 is attached so as to cover the outer surface 9 of the sound absorber 3 in a relaxed state so that a space 17 is formed between the outer surface 9 of the sound absorber 3.
According to the soundproof wall 1 of the best mode 2, since the covering material 16 vibrates due to the sound pressure, the sound energy is converted into heat energy and the sound pressure is lowered. Therefore, compared with the soundproof wall 1 of the best mode 1. Sound insulation performance is improved. In addition, since the covering material 16 is provided, the sound absorbing body 3 can be prevented from being wet by rain or scattered in a strong wind.

Best form 3
As shown in FIG. 5, it is good also as a soundproof wall which covered the outer surface of the coating | covering material 16 with the coating | covering materials 18, such as metal meshes, such as a metal-mesh and punching metal. As a result, it is possible to prevent the covering material 16 and the sound absorber 3 from being wet by rain and from being scattered during strong winds. The outer surface of the sound absorber 3 may be covered with the covering material 18.

Best form 4
As shown in FIG. 6, it is good also as the sound barrier 1 provided with the double sound absorber 3 which consists of the inner side sound absorber 3a and the outer side sound absorber 3b. The inner sound absorber 3a and the outer sound absorber 3b are formed in a cylindrical body having the same slit 4 as in the best mode 1. The inner sound absorber 3a is formed in such a size that the outer surface 21 of the inner sound absorber 3a does not contact the inner surface 22 of the outer sound absorber 3b, and is disposed inside the outer sound absorber 3b and coaxially with the outer sound absorber 3b. Therefore, a space 10 is formed between the inner sound absorber 3a and between the inner sound absorber 3a and the outer sound absorber 3b.
According to the soundproof wall 1 of the best mode 4, the sound absorber 3 having a double-cylinder configuration including the inner sound absorber 3a and the outer sound absorber 3b is provided, and the inner side, the inner sound absorber 3a, and the outer side of the inner sound absorber 3a. Since the space 10 is formed between the sound absorber 3b, the sound insulation performance is improved by the plurality of sound absorbers 3a; 3b and the space 10;

Best form 5
As shown in FIG. 7, the sound absorber 3 formed in a cylindrical body having an elliptical cross section having the same slit 4 as in the best mode 1 is used, and the major axis direction of the cylindrical body of the sound absorber 3 is the wall body 2. The sound-absorbing wall 1 may have a configuration in which the sound-absorbing body 3 is attached to the upper end portion 6 of the wall body 2 so as to be in a direction orthogonal to the wall surface 7.
According to the soundproof wall 1 of the best mode 5, compared with the case where the cylindrical sound absorber 3 is used, the inner surface 23 at both ends in the major axis direction of the cylindrical body of the sound absorber 3 and the wall surface 7 of the wall body 2 are formed. Since the length W between them can be increased, the space 10 on both sides of the both wall surfaces 7; 7 of the upper end portion 6 is increased, and the sound insulation performance is improved.

Best form 6
As shown in FIG. 8, a rectangular cylindrical sound absorber 3 may be used. That is, the sound-insulating wall 1 may be configured such that the sound absorbing body 3 having a rectangular tube shape is attached to the upper end portion 6 of the wall body 2 and the space 10 is formed outside the wall body 2.

Best form 7
As shown in FIG. 9, it is good also as a structure which provided the sound-absorbing body 3 formed in the upper end surface 6t of the wall body 2 with the cylinder. In other words, the sound-absorbing wall 1 may be configured such that the sound-absorbing body 3 formed of a cylindrical body is attached to the upper end surface 6 t of the wall body 2 and the space 10 is formed outside the wall body 2. Even in this configuration, the sound insulation performance is improved by providing the sound absorber 3 and the space 10, and the soundproof wall 1 having good sound insulation performance can be obtained even if the height is lowered.

Best form 8
As shown in FIG. 10, side wall bodies 25; 26 are provided on the left and right ends of the wall body 2 of each of the above-described best forms of the soundproof wall 1, and a concave soundproof wall 1A surrounding the sound source 11 as viewed from above. It was. That is, the wall body 2 having the sound absorbing body 3 at the upper end 6 is provided with side wall bodies 25; 26 at the left and right ends, respectively, and the left and right side wall bodies 25; 26 are provided so as to face each other in parallel. It was set as wall 1A.
According to the best mode 6, since the left and right side wall bodies 25; 26 are provided, it is possible to prevent the sound from being transmitted from the side portion of the wall body 2 to the sound disgusting portion 12, and the lateral length Y of the wall body 2 can be shortened. A sound barrier 1A having good sound insulation performance can be obtained.

  As shown in FIG. 11, a soundproof wall test body 100 including the soundproof wall 1 described in FIG. 1; FIG. 3 and the left and right side wall bodies 25; 26 described in FIG. The performance was tested. In addition, the thing of the structure which accommodated the nonwoven fabric in the cavity of the rectangular box-shaped wall surface structure body provided with the rectangular cavity was used for the wall body 2 and the side wall body 25; 26 of the test body 100. FIG. The experimental apparatus used a speaker as a sound source 11, a microphone not shown, and a measuring machine. In the experiment method, a speaker is installed on the ground in the inner region surrounded by the test body 100, sound is generated from the speaker in the direction of the wall body 2 of the test body 100, and it is close to the sound aversion part 12 in the wall body 2. Sound was picked up by a microphone at a plurality of sound measurement points set at positions away from the speaker from the wall surface 7a, and the sound pressure levels at the sound measurement points were measured. The plurality of sound measurement points are a plurality of points indicated by circles arranged in a matrix in FIG. The numbers written side by side next to the ○ mark matrix in FIG. 11A are the row numbers of the sound measurement points, and the English characters written horizontally below the ○ mark matrix in FIG. 11A are the sound measurements. The column number of the point. The space a between adjacent sound measurement points and the space b between columns are 250 mm. In FIG. 11A, 1 m, 2 m, and 3 m indicate the distance from the wall surface 7 a near the sound disgusting portion 12 in the wall body 2. FIG. 11B is a view of the experimental apparatus and the sound measurement point as viewed from above. The height X of the test body 100 is 2170 mm, the facing distance between the side wall body 25 and the side wall body 26 (= horizontal width of the wall body 2) Y is 2400 mm, the lateral width Z of the side wall body 25 and the side wall body 26 is 4400 mm, and the speaker and the wall body The separation distance K between the two was 2200 mm. It should be noted that the sound insulation performance of the test body 100A having a structure in which the sound absorber 3 having a wall thickness t = 50 mm and a cylindrical body diameter φ = 200 mm is attached, and the sound absorber having a wall thickness t = 50 mm and a cylindrical body diameter φ = 300 mm. The sound insulation performance of the test body 100B having a configuration in which is attached is measured. That is, the sound insulation performance of the two types of test bodies 100A and 100B provided with the sound absorbers having different diameters φ of the cylindrical body and the sound insulation performance of the test body 100C (comparative example) having no sound absorber were measured.

  The measurement results are shown in FIGS. The main AP shown in FIG. 12 shows the result of measuring the sound pressure level (physical quantity). The sub AP in FIG. 13 shows the result of measuring the noise level (audibility). 14 to 20 show the results of measuring the sound pressure level for each frequency band, and the measurement target frequency band is shown in the upper left of each figure in FIGS. 14 to 20. 12 to 20, (a) shows the sound insulation performance result of the test body 100C (comparative example), (b) shows the sound insulation performance result of the test body 100A (200φ), and (c) shows the test body 100B ( 300φ) sound insulation performance results are shown. The numbers shown in the left diagrams of FIGS. 12 to 20 indicate the row numbers of the sound measurement points, and the English letters indicate the column numbers of the sound measurement points. That is, the left diagrams of FIGS. 12 to 20 show the sound reception levels within the sound measurement point matrix range of FIG. 11A based on the measurement values measured at the sound measurement points of FIG. It is the figure which showed the measured value divided into the area | regions. In the numerical sequence shown on the right side of FIGS. 12 to 20, OO indicates the sound pressure level width, and () numbers on the right side of OO are identification codes. For example, the 90-91 dB region based on the measurement result is the region indicated by (1) in the left figure. From FIG. 12 to FIG. 20, the test body A; B has a lower sound reception level within the sound measurement point matrix range of FIG. 11A than the test body C, and within the sound measurement point matrix range. It can be seen that the sound insulation performance is improved.

  21 to 28 show the results of setting a plurality of points with different distances from the wall surface 7a of the wall body 2 as sound measurement points and measuring the sound reception levels at these sound measurement points for each test body. (Std) shown in FIGS. 21 to 28 is the value of the test body C, (200φ) is the value of the test body A, (300φ) is the value of the test body B, the vertical axis of the graph is the sound reception level (dB), The horizontal axis indicates the distance from the wall surface 7a. FIG. 21 shows the results of the sound reception level and distance in the 63 Hz band and the 125 Hz band. In these low frequency bands, there is little difference in the sound insulation performance of each specimen. From the results shown in FIG. 21 to FIG. 28, it can be seen that the sound insulation performance of the specimens A and B is improved as compared with the specimen C as the frequency band becomes higher. In addition, it can be seen from FIG. 25 that the specimens A and B have improved sound insulation performance regarding the sub AP (noise level (audibility)).

  FIG. 26 shows the performance of the specimen C from FIGS. 21 to 25 collectively. FIG. 27 shows the performance of the specimen A from FIGS. 21 to 25 collectively. FIG. 28 shows the performance of the specimen B from FIGS. 21 to 25 collectively.

  As the sound absorber, a cylindrical body or a cylindrical body having a triangular cross section or a polygonal cross section may be used.

The perspective view which shows a soundproof wall (best form 1). The perspective view which shows a sound-absorbing body (best form 1). Sectional drawing which shows the upper part of a soundproof wall (best form 1). Sectional drawing which shows the upper part of a soundproof wall (best form 2). Sectional drawing which shows the upper part of a soundproof wall (best form 3). Sectional drawing which shows the upper part of a soundproof wall (best form 4). Sectional drawing which shows the upper part of a soundproof wall (best form 5). Sectional drawing which shows the upper part of a soundproof wall (best form 6). Sectional drawing which shows the upper part of a soundproof wall (best form 7). The top view which shows a soundproof wall (best form 8). The figure which shows an experimental apparatus and a test body. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result. The figure which shows an experimental result.

Explanation of symbols

1; 1A soundproof wall, 2 walls, 3 sound absorber, 4 slit, 6 upper end,
8 inner surface, 10 space, 16; 18 covering material, 25; 26 side wall body.

Claims (3)

A wall body, and a sound absorber made of a cylindrical body that is attached to the upper end of the wall body and forms a space outside the wall body ,
The sound absorber includes an outer sound absorber and an inner sound absorber provided inside the outer sound absorber, and the outer sound absorber and the inner sound absorber have through-holes penetrating the outer surface and the inner surface of the cylindrical body, respectively. Formed by a cylindrical body with a slit extending linearly across one end and the other end of the cylindrical body,
The upper end of the wall is formed by the slit of the cylindrical body of the outer sound absorber and the cylindrical body of the inner sound absorber so that a space is formed between the inside of the inner sound absorber and between the inner sound absorber and the outer sound absorber. It is located inside the cylindrical body of the inner sound absorber through the slit, and both wall surfaces of the upper end portion of the wall body are sandwiched between the slit of the cylindrical body of the outer sound absorber and the slit of the cylindrical body of the inner sound absorber. Thus, the outer sound absorber and the inner sound absorber are provided at the upper end of the wall along the upper edge of the wall, and the upper end of the wall positioned inside the inner sound absorber and the cylindrical shape of the inner sound absorber. By being formed so as not to contact the inner surface of the body, a space is formed between the inner surface of the cylindrical body forming the inner sound absorbing body and the upper end portion of the wall body, and the outer surface of the outer sound absorbing body is covered. A soundproof wall covered with a material . The soundproof wall according to claim 1, wherein the wall body is provided with side wall bodies at left and right ends, respectively, and the left and right side wall bodies are provided to face each other. The soundproof wall according to any one of claims 1 and 2, wherein the inner sound absorbing body and the outer sound absorbing body have a circular cross-sectional shape.

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