JP4170196B2 - Soundproofing device - Google Patents

Description

  The present invention relates to a soundproofing device that can be miniaturized to improve mounting properties and reduce manufacturing costs, and is particularly suitable for a soundproofing device that constitutes an upper portion of a soundproofing wall provided as a measure for preventing noise generated from roads, railways, factories, and the like. It is a thing.

  Conventionally, as a countermeasure against noise generated from roads, railways, factories, etc., it has been widely practiced to install a soundproof wall in order to prevent the noise from directly propagating. This is because the cost of countermeasures is relatively low among various noise prevention measures, and it is effective against various noise sources. By increasing the height of the noise barrier, the noise reduction effect can be achieved. It becomes possible to make it larger.

However, the higher the height of the soundproof wall, the higher the construction costs and so on, and the higher the cost. . Therefore, in order to increase the noise reduction effect without increasing the height of the soundproof wall, a plurality of openings that are opened upward at the top of the soundproof wall and take in noise as in the structure of Patent Document 1 shown in FIG. The soundproofing device 110 having the concave portions 122 and 124 has been developed.
JP 2000-8332 A JP 2000-110120 A

  However, in particular, the structure of the soundproofing device disclosed in Patent Document 1 shown in FIG. 11 includes the wall portion 114 formed in a curved shape in addition to the wall portion 112 formed in a straight shape. As the width dimension D1 is increased, the mounting location is greatly restricted, and the mounting work of the soundproofing device 110 is difficult, which increases the cost for the construction.

Further, since it is difficult to manufacture the wall portion 114 formed in a curved shape, there is a disadvantage that the manufacturing cost of the soundproofing device increases.
An object of the present invention is to provide a soundproofing device that can reduce the manufacturing cost while reducing the size of the device while taking the above fact into consideration.

The soundproofing device according to claim 1 is a pair of branches that are located above the soundproofing wall and are branched into a wall surface that is inclined toward the sound source side and a wall surface that is inclined toward the non-sound source side. With walls,
A pair of tip walls that are each formed shorter than the branch walls and that extend in a straight line upward while being inclined toward each other from the upper ends of the pair of branch walls;
A side wall disposed on the sound source side of the pair of branch walls and extending linearly upward;
It is characterized by having.

The operation of the soundproofing device according to claim 1 will be described below.
In the present claim, the pair of branch walls branched into the wall surface inclined toward the sound source side and the wall surface inclined toward the opposite sound source side are configured to extend linearly upward while being inclined. In addition, a pair of tip walls formed shorter than the branch walls respectively extend upward in a straight line while being inclined so as to approach each other from the upper ends of the pair of branch walls, and the sound sources of the pair of branch walls A side wall disposed on the side extends linearly upward.

Therefore, since the pair of branch walls, the pair of tip walls, and the side walls are each formed in a straight line and do not have a curved wall, the width of the soundproofing device is reduced. In addition, the installation place of the soundproofing device is not greatly restricted, and the mounting work of the soundproofing device is facilitated and the cost for construction is reduced. Further, since there is no wall portion formed in a curved shape, the manufacture of each wall described above is facilitated, and the manufacturing cost of the soundproofing device is reduced.
As described above, according to the present claims, the soundproofing device is downsized to improve the mounting property, and the manufacturing cost of the soundproofing device is reduced.

The operation of the soundproofing device according to claim 2 will be described below.
The present invention has the same configuration as that of the first aspect and operates in the same manner, but further includes a support wall extending linearly upward from the top of the soundproof wall, and a pair of branches at the upper end of the support wall. It has the structure that the lower end part of a wall is attached.
Therefore, in this claim, it is possible to easily arrange the pair of branch walls at a required height position on the soundproof wall by adjusting the height of the support wall. Furthermore, a parallel space is formed between the side wall and the support wall, so that it becomes easier to obtain the necessary soundproofing characteristics.

The operation of the soundproofing device according to claim 3 will be described below.
In this claim, it has the same configuration as in claim 2 and operates in the same way, but further, on the opposite side of the sound source side from the upper end of the branch wall that is inclined to the sound source side of the pair of branch walls. The side wall is located.
Therefore, since the side wall is not arranged so as to protrude toward the sound source side from the upper end portion of the branch wall on the side inclined to the sound source side, the overall width dimension of the soundproofing device is reduced. In addition, the soundproofing device is further reduced in size and weight.

The operation of the soundproofing device according to claim 4 will be described below.
This claim has the same configuration as that of claim 2 and operates in the same manner, but further has a configuration in which the side wall is formed higher than the height of the support wall.
Therefore, in combination with adjusting the height of the support wall, the parallel space between the side wall and the support wall is extended upward, and the necessary soundproofing characteristics are reduced while reducing the overall width dimension of the soundproofing device. It becomes easier to obtain.

The operation of the soundproofing device according to claim 5 will be described below.
This claim has the same configuration as that of claim 1 and operates in the same manner, but further includes a support wall extending linearly upward from the top of the soundproof wall, and on the sound source side of the pair of branch walls. The upper end portion of the branch wall that is an inclined wall surface is attached to the upper end portion of the support wall.

  Therefore, in this claim, the upper end portion of the branch wall that is inclined to the sound source side is attached to the upper end portion of the support wall that linearly extends upward from the upper portion of the soundproof wall. As a result, not only can the branch wall be easily placed at the required height position on the soundproof wall, but also the gap between the support wall and the side wall is reduced, resulting in a smaller overall width dimension of the soundproofing device. As a result, the soundproofing device is further reduced in size and weight.

The operation of the soundproofing device according to claim 6 will be described below.
The present invention has the same configuration as that of the first aspect and operates in the same manner, but further, the oblique wall is provided at the upper end of the side wall and is located on the sound source side of the pair of distal walls. The slanting wall extends in a straight line upward while inclining toward the anti-sound source side so as to be parallel to each other.

  Accordingly, in the present invention, the tip wall and the skew wall are provided by installing at the upper end portion of the side wall a sloping wall that is inclined in the opposite direction to the sound source side so as to be parallel to the tip wall and extends linearly upward. A parallel space is created between the two. As a result, the parallel space between the side wall and the support wall is extended upward, and the necessary soundproof characteristics can be more easily obtained.

The operation of the soundproofing device according to claim 7 will be described below.
The present invention has the same configuration as that of the second embodiment and operates in the same manner, but further has a configuration in which the anti-sound source side wall extending linearly upward is provided on the anti-sound source side of the pair of branch walls. Have.
Therefore, in this claim, since a parallel space is formed between the side wall on the opposite side of the sound source and the support wall, it becomes easier to obtain the necessary soundproofing characteristics in combination with other spaces.

The operation of the soundproofing device according to claim 8 will be described below.
In this claim, it has the same configuration as that of claim 7 and operates in the same manner. However, a lateral wall is provided between the side wall and the support wall or between the side wall on the opposite side of the sound source and the support wall. It has a configuration that.
Therefore, in this claim, as a result of either the space existing between the side wall and the support wall or the space existing between the anti-sound source side wall and the support wall becoming shallow due to the presence of the lateral wall, With these spaces, the energy of sounds having different frequencies can be attenuated more reliably, and the necessary soundproofing characteristics can be obtained more reliably.

  As described above, according to the above-described configuration of the present invention, there is an excellent effect that it is possible to provide a soundproof device capable of reducing the manufacturing cost while reducing the size, and is generated from roads, railways, factories, and the like. A particularly excellent effect is exhibited by a soundproofing device constituting the upper part of a soundproofing wall provided as a noise prevention measure.

A soundproofing device according to the best mode of the present invention will be described with reference to the drawings.
First, a first embodiment of the soundproofing device according to the best mode of the present invention will be described with reference to FIGS. As shown in FIG. 1, a soundproof wall 40 provided along a road or a railroad has a sound source side (right side in FIG. 1) where noise is generated due to roads, railways, factories, and the like, and an anti-sound source side where these noises are not generated. (Left side in FIG. 1).

  A pair of branch walls 16, 18 connected to each other on the lower end side and branched at an angle of 90 °, for example, are formed on the upper portion of the soundproof wall 40 so as to linearly extend upward while being inclined. ,positioned. A wall surface inclined at an angle of 45 °, for example, at the sound source side is defined as the first branch wall 16, and a wall surface inclined at an angle of 45 °, for example, at the counter sound source side is defined as the second branch wall 18.

  Further, a first tip wall 20 formed shorter than the first branch wall 16 extends from the upper end portion of the first branch wall 16 so as to be inclined at an angle of, for example, 45 ° toward the counter sound source. Further, a second tip wall 22 formed shorter than the second branch wall 18 extends from the upper end portion of the second branch wall 18 so as to incline at a 45 ° angle, for example, toward the sound source. That is, the pair of tip walls 20 and 22 are formed so as to extend linearly upward while being inclined so as to approach each other from the upper ends of the pair of branch walls 16 and 18.

  As described above, the pentagonal cross-sectional space that is defined by the pair of branch walls 16 and 18 and the pair of tip walls 20 and 22 and that is a recess having an open top is the first space of the soundproofing device 10 of the present embodiment. This is part 32.

  On the other hand, a support wall 14 is attached to the upper portion of the soundproof wall 40 via a connecting member 12 fixed to the soundproof wall 40 by screwing or the like. It is provided in a shape extending linearly upward. The lower ends of the pair of branch walls 16 and 18 are attached to the upper end of the support wall 14.

  Further, the lower end portion of the support wall 14 is connected to a bottom wall 24 arranged so as to extend in the horizontal direction between the sound source side and the counter sound source side. A lower end portion of the side wall 26 extending linearly is attached to the upper side in the vertical direction. Therefore, in this embodiment, the side wall 26 is arranged on the sound source side of the pair of branch walls 16 and 18.

However, in the soundproofing device 10 of the present embodiment, as shown in FIG. 1, the anti-sound source is a distance D2 from the upper end portion of the first branch wall 16 that is the wall surface inclined to the sound source side of the pair of branch walls 16 and 18. The side wall 26 is located closer to the side, and the height H2 of the side wall 26 is higher than the height H1 of the support wall 14.
As described above, the space that is defined by the support wall 14, the bottom wall 24, and the side wall 26 and that is a recess that extends in the vertical direction and is open at the top is the second space 34 of the soundproofing device 10 according to the present embodiment. It is said that.

  Further, as shown in FIG. 3, a plurality of the soundproofing devices 10 are provided, for example, continuously on the soundproofing wall 40 in parallel with the soundproofing wall 40 along the road or the track. However, in order to increase the strength of the soundproofing device 10, a plurality of partition members 30 as shown in FIG. 2 are arranged, for example, at equal intervals so as to partition the first space portion 32 and the second space portion 34. . Each wall is appropriately provided with a bent portion 36 for connecting to the partition member 30.

  Therefore, in the present embodiment, noise generated from the road or the track enters the opened first space portion 32 and the second space portion 34, and the frequencies of the first space portion 32 and the second space portion 34 are different from each other. Each sound energy is attenuated.

Next, the operation of the soundproofing device 10 according to the present embodiment will be described below.
In the present embodiment, the support wall 14 extending linearly upward from the top of the soundproof wall 40 is attached to the soundproof wall 40 via the connecting member 12. In addition, a pair of branch walls 16 and 18 branched into a wall surface inclined toward the sound source side and a wall surface inclined toward the anti-sound source side extend linearly upward while being inclined, and the pair of branch walls 16 and 18. A pair of tip walls 20 and 22 formed shorter each extend linearly upward while inclining from the upper ends of the pair of branch walls 16 and 18 toward each other.

  And the lower end part of a pair of branch walls 16 and 18 is attached to the upper end part of said support wall 14, These pair of branch walls 16 and 18 and a pair of front end walls 20 and 22 are fixed to this support wall 14. It has a structure. Furthermore, in the soundproofing device 10 of the present embodiment, the side wall 26 is disposed on the sound source side of the pair of branch walls 16 and 18 so as to extend linearly upward.

  Therefore, since the support wall 14, the pair of branch walls 16, 18, the pair of tip walls 20, 22 and the side wall 26 are each formed in a straight line shape and do not have a curved wall portion, soundproofing is achieved. As the width dimension of the device 10 is reduced, the installation location of the soundproofing device 10 is not greatly restricted, and the mounting work of the soundproofing device 10 is facilitated and the cost for construction is reduced. It becomes like this.

  Moreover, since there is no wall part formed in the curved surface shape, manufacture of each said wall becomes easy and the manufacturing cost of the soundproofing apparatus 10 comes to be reduced. As described above, according to the present embodiment, the soundproofing device 10 is downsized to improve the mounting property, and the manufacturing cost of the soundproofing device 10 is reduced.

  On the other hand, in this embodiment, a support wall 14 that extends linearly upward from the top of the soundproof wall 40 is provided, and the lower ends of the pair of branch walls 16 and 18 are attached to the upper end of the support wall 14. Therefore, the pair of branch walls 16 and 18 can be easily arranged at the required height of the soundproof wall 40 by adjusting the height H1 of the support wall 14. And the 2nd space part 34 which is a parallel space is formed between the side wall 26 and the support wall 14, and it becomes easier to obtain a required soundproof characteristic.

  Further, in the present embodiment, the side wall 26 is positioned closer to the side opposite to the sound source than the upper end portion of the first branch wall 16 that is inclined to the sound source side, and the height H2 of the side wall 26 is supported. The wall 14 is formed higher than the height H1. Accordingly, since the side wall 26 is not arranged to protrude toward the sound source side from the upper end portion of the first branch wall 16 on the side inclined to the sound source side, the entire soundproofing device 10 is also provided in this embodiment. As the width dimension of the soundproofing device becomes smaller, the soundproofing device 10 becomes smaller and lighter.

  Further, since the height H2 of the side wall 26 is formed higher than the height H1 of the support wall 14, in combination with the adjustment of the height H1 of the support wall 14, the space between the side wall 26 and the support wall 14 is increased. The parallel space is extended upward, and it becomes easier to obtain the necessary soundproofing characteristics while reducing the overall width dimension D1 of the soundproofing device 10 shown in FIG.

Next, a second embodiment of the soundproofing device according to the best mode of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Example, and the duplicate description is abbreviate | omitted.
As shown in FIG. 4, the soundproofing device 10 of the present embodiment also has a pair of branch walls 16 and 18 and a pair of tip walls 20 and 22, respectively, and a first space portion 32 is formed by these. However, in the present embodiment, the first branch wall which is a wall inclined to the sound source side of the pair of branch walls 16 and 18 at the upper end portion of the support wall 14 linearly extending upward from the upper part of the soundproof wall 40. The connection part of the upper end part of 16 and the 1st front-end | tip wall 20 has the attached structure.

  Furthermore, in the soundproofing device 10 of this embodiment, the side wall 26 is disposed on the sound source side of the pair of branch walls 16 and 18 so as to extend in the horizontal direction between the sound source side and the counter sound source side. The lower end of the side wall 26 is attached to the end of the bottom wall 24 on the sound source side, and the side wall 26 is provided so as to extend linearly upward in the vertical direction. However, in the present embodiment, the upper end portion of the side wall 26 is inclined to the side opposite to the sound source so as to be parallel to the first tip wall 20 located on the sound source side of the pair of tip walls 20 and 22. A slanting wall 28 that extends linearly upward is installed. The height of the upper end portion of the skew wall 28 and the height of the pair of tip walls 20 and 22 are the same.

Next, the operation of the soundproofing device 10 according to the present embodiment will be described below.
Also in the present embodiment, the pair of branch walls 16 and 18 branched into the wall surface inclined toward the sound source side and the wall surface inclined toward the non-sound source side extend linearly upward while being inclined, and the pair of branches. A pair of front end walls 20 and 22 formed shorter than the walls 16 and 18 respectively extend linearly upward while inclining so as to approach each other from the upper ends of the pair of branch walls 16 and 18. Further, a side wall 26 is disposed on the sound source side of the pair of branch walls 16 and 18 so as to extend linearly upward.

  However, in the soundproofing device 10 of the present embodiment, a pair of branch walls is formed such that the upper end portion of the first branch wall 16 is attached to the upper end portion of the support wall 14 linearly extending upward from the upper portion of the soundproof wall 40. 16 and 18 and a pair of tip walls 20 and 22 are fixed to the support wall 14.

  Furthermore, in the soundproofing device 10 of the present embodiment, the side wall 26 is not only disposed on the sound source side of the pair of branch walls 16 and 18 so as to extend linearly upward, but is parallel to the first tip wall 20. A slanting wall 28 extending in a straight line upward while being inclined toward the opposite sound source side is installed at the upper end of the side wall 26.

Therefore, also in the soundproofing device 10 of the present embodiment, the support wall 14, the pair of branch walls 16, 18, the pair of tip walls 20, 22, the side wall 26, and the oblique wall 28 are each formed in a straight line shape and curved. Since the wall portion is not formed, the installation location is not greatly restricted, and the installation work is facilitated and the cost for construction is reduced. Is easy to manufacture, and the manufacturing cost of the soundproofing device 10 is reduced.
As described above, also according to the present embodiment, the soundproofing device 10 is downsized to improve the mounting property, and the manufacturing cost of the soundproofing device 10 is reduced.

  On the other hand, in the present embodiment, the upper end portion of the first branch wall 16 that is a wall surface inclined toward the sound source side is attached to the upper end portion of the support wall 14 that linearly extends upward from the upper portion of the soundproof wall 40. Therefore, by adjusting the height of the support wall 14, not only can the pair of branch walls 16, 18 be easily arranged at a required height position on the soundproof wall 40, but also the support wall 14 and the side wall 26 can be arranged. As a result of the gap between them becoming smaller, the soundproofing device 10 becomes smaller and lighter as the overall width D1 of the soundproofing device 10 becomes smaller.

  Furthermore, in the present embodiment, the slanting wall 28 that is inclined in the direction opposite to the sound source so as to be parallel to the first tip wall 20 and linearly extends upward is installed at the upper end of the side wall 26. Thus, a parallel space can be formed between the first tip wall 20 and the oblique wall 28. As a result, the second space 34, which is a parallel space between the side wall 26 and the support wall 14, is extended upward, making it easier to obtain the necessary soundproofing characteristics.

Next, a third embodiment of the soundproofing device according to the best mode of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Example, and the duplicate description is abbreviate | omitted.
As shown in FIG. 5, the soundproofing device 10 of this embodiment also has a pair of branch walls 16 and 18 and a pair of tip walls 20 and 22, respectively, as in the first embodiment. The side wall 26 is disposed on the sound source side of the pair of branch walls 16 and 18, and the second space 34 is formed by the support wall 14, the bottom wall 24, and the side wall 26. .

  However, in the soundproofing device 10 of the present embodiment, the pair of branch walls 16 and 18 are linearly upward in the vertical direction so that the side wall 52 which is the side wall on the side opposite to the sound source is also arranged on the side opposite to the sound source. The extending side wall 52 has a lower end portion attached to the connecting member 12.

  That is, in the soundproofing device 10 of the present embodiment, not only the first space portion 32 and the second space portion 34 but also the support wall 14, the connecting member 12, and the side wall 52 are partitioned, and the upper portion extends in the vertical direction. The third space portion 54 that is a space serving as an open recess is formed on the side opposite to the sound source of the first space portion 32.

  As described above, the present embodiment is also substantially the same structure as the first embodiment and has the same effects as the first embodiment, but in this embodiment, a parallel space is provided between the side wall 52 and the support wall 14. The third space portion 54 is formed. Therefore, in the present embodiment, not only the first space portion 32 and the second space portion 34 in which noise generated from the road or the track is opened, but also enters the third space portion 54, and the inside of each of these space portions 32, 34, 54 Thus, the energy of sounds having different frequencies is attenuated, and the necessary soundproofing characteristics can be obtained more easily.

Next, a fourth embodiment of the soundproofing device according to the best mode of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Example and 3rd Example, and the duplicate description is abbreviate | omitted.
As shown in FIG. 6, the soundproofing device 10 of this embodiment also has a pair of branch walls 16 and 18 and a pair of tip walls 20 and 22, respectively, as in the third embodiment, thereby forming a first space portion 32. In addition to the side wall 26 and the side wall 52, the second space 34 and the third space 54 are formed.

  However, the soundproofing device 10 of the present embodiment has a structure in which a lateral wall 56 that connects between the side wall 52 and the support wall 14 is disposed at a predetermined height portion. For this reason, in the present embodiment, since the third space portion 54 is shallower than the second space portion 34, it is possible to more reliably attenuate the energy of sounds having different frequencies, and the necessary soundproofing. It becomes easier to obtain the characteristics more reliably. In the present embodiment, the third space portion 54 on the anti-sound source side is shallower than the second space portion 34 on the sound source side. On the contrary, the second space portion 34 on the sound source side is shallow. It may be a space.

Next, a description will be given of test results obtained by comparing soundproof characteristics between the conventional example and each example.
As shown in FIG. 7, a test on each soundproof characteristic was performed under the condition that a sound source 42 that generates sound and an evaluation point 44 such as a microphone are arranged on a floor surface 46.
Then, the soundproofing device of the conventional example, the soundproofing device of the first embodiment, and the sound pressure level (hereinafter referred to as SPL) data at each frequency are taken as evaluation points 44 and shown in the graph of FIG. The SPL data at the respective frequencies of the apparatus, the soundproofing device of the second embodiment and the frequency are similarly taken as the evaluation point 44 and shown in the graph of FIG. 9, and further, the soundproofing device of the conventional example, the soundproofing device of the fourth embodiment, and the frequency at each frequency. SPL data was also taken at the evaluation point 44 and shown in the graph of FIG.

  From these graphs, it can be understood that the soundproofing devices of the first embodiment, the second embodiment, and the fourth embodiment can obtain soundproofing characteristics equivalent to those of the conventional soundproofing device. As a result, it has been confirmed that the soundproofing characteristics equivalent to those of the soundproofing device of the conventional example can be obtained also by these embodiments in which the size is reduced and the mounting property is improved and the manufacturing cost is reduced.

  The length L of the soundproofing device shown in FIG. 7 is 6000 mm, the height H3 of the soundproofing device is 1385 mm, the distance A between the soundproofing device and the sound source 42, and the distance between the soundproofing device and the evaluation point 44. The distance B was 2500 mm.

  Furthermore, each wall of the soundproofing device 10 according to the above embodiment can be formed of a metal plate material, but the soundproofing device can be reduced in weight, and has excellent rust prevention and corrosion resistance, and can be easily constructed. Therefore, it may be formed of an extruded aluminum material. However, each wall may be formed of other materials such as synthetic resin.

It is a side view showing the soundproofing device of the 1st example concerning the present invention. It is a perspective view which shows the soundproofing apparatus of 1st Example which concerns on this invention. It is a figure which shows the state which arranged the soundproof apparatus of 1st Example which concerns on this invention in multiple numbers on the soundproof wall, Comprising: (A) is a top view, (B) is a front view. It is a side view which shows the soundproofing apparatus of 2nd Example which concerns on this invention. It is a side view which shows the soundproofing apparatus of 3rd Example based on this invention. It is a side view which shows the soundproofing apparatus of 4th Example based on this invention. It is a figure which shows the test conditions for comparing a soundproof characteristic, Comprising: (A) is a top view, (B) is a side view. It is a figure which shows the graph showing the soundproof characteristic of the soundproofing apparatus of a prior art example, and the soundproofing apparatus of 1st Example. It is a figure which shows the graph showing the soundproof characteristic of the soundproofing apparatus of a prior art example, and the soundproofing apparatus of 2nd Example. It is a figure which shows the graph showing the soundproof characteristic of the soundproofing apparatus of a prior art example, and the soundproofing apparatus of 4th Example. It is a side view which shows the soundproofing apparatus of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soundproof device 14 Support wall 16, 18 Branch wall 20, 22 Tip wall 26 Side wall 28 Skew wall 40 Soundproof wall

Claims (8)

A pair of branch walls that are located at the top of the soundproof wall and are branched into a wall surface that is inclined toward the sound source side and a wall surface that is inclined toward the anti-sound source side;
A pair of tip walls that are each formed shorter than the branch walls and that extend in a straight line upward while being inclined toward each other from the upper ends of the pair of branch walls;
A side wall disposed on the sound source side of the pair of branch walls and extending linearly upward;
A soundproofing device characterized by comprising:   The soundproofing device according to claim 1, wherein a support wall extending linearly upward from the upper part of the soundproof wall is provided, and a lower end portion of the pair of branch walls is attached to an upper end portion of the support wall.   The soundproofing device according to claim 2, wherein the side wall is located closer to the side opposite to the sound source than an upper end portion of the branch wall that is inclined to the sound source side of the pair of branch walls.   The soundproofing device according to claim 2, wherein the side wall is formed higher than the height of the support wall.   A support wall that extends linearly upward from the top of the soundproof wall is provided, and the upper end of the branch wall that is inclined to the sound source side of the pair of branch walls is attached to the upper end of the support wall. The soundproofing device according to claim 1.   The slant wall is installed at the upper end of the side wall, and the slant wall is inclined upward toward the anti-sound source side so that it is parallel to the tip wall located on the sound source side of the pair of tip walls. The soundproofing device according to claim 1, wherein the soundproofing device extends.   The soundproofing device according to claim 2, wherein the side wall on the opposite side of the sound source extending linearly upward is provided on the side opposite to the sound source of the pair of branch walls. 8. The soundproofing device according to claim 7, wherein a lateral wall is provided between the side wall and the support wall or between the anti-sound source side wall and the support wall.

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