JP2016211344A - Soundproof wall facility - Google Patents

Abstract

The present invention provides a soundproof wall facility that can easily enhance the soundproofing effect in a low frequency sound range.
SOLUTION: A soundproof panel 1A having a sound insulation surface on the back opposite to the sound source side is arranged in a plurality of stages in the vertical direction, and the topmost one of the soundproof panels arranged in a plurality of stages in the vertical direction. Furthermore, a sound absorbing space with a sound absorbing material is formed inside, and an outer frame body that can form a partition that separates the sound source and the periphery of the sound source is provided so that sound in the sound absorbing space and the outside thereof can be transmitted. A sound-absorbing panel 1B formed on the sound source side surface portion and the back surface portion of the outer frame body is attached to a sound transmitting surface provided with a large number of sound insertion holes allowing entry and exit. The plurality of sound absorbing panels 1B are stacked and fixed in a state where their surface portions are along the vertical direction.
[Selection] Figure 1

Description

  The present invention provides a soundproof panel having a sound insulation surface on the back side opposite to the sound source side, arranged in a plurality of stages in the vertical direction, and the topmost one of the soundproof panels arranged in a plurality of stages in the vertical direction. Furthermore, a sound absorbing space with a sound absorbing material is formed inside, and an outer frame body that can form a partition that separates the sound source and the periphery of the sound source is provided so that sound in the sound absorbing space and the outside thereof can be transmitted. The present invention relates to a soundproof wall facility in which a sound absorbing surface is provided on a sound source side surface portion and a back surface portion of the outer frame body with a sound transmitting surface provided with a number of sound insertion holes enabling entry and exit.

Conventionally, the soundproofing wall equipment generally has the soundproofing panels in which the soundproofing panels are arranged in a plurality of stages in the vertical direction, and the sound absorbing material provided in the sound absorbing space has the same surface density. The sound source side surface of each soundproof panel is formed on the sound transmission surface, whereas the back side is provided with a sound insulation surface made of a rigid plate, providing a sound insulation wall function. (For example, refer to Patent Document 1).
For this reason, there is a large difference in sound pressure between the sound source side and the back side of the sound insulation panels arranged in the vertical direction, and the energy of the accelerated sound (this is referred to as the “edge effect” in the region near the edge of the top edge of the sound barrier equipment. However, there is a problem that the diffracted sound spreads to the house side on the back side of the soundproof wall equipment by generating a diffraction phenomenon.
Therefore, in order to solve the above-mentioned problem, the sound transmission surface is provided on the sound source side surface portion further above the uppermost one of the soundproof panels arranged in a plurality of stages in the vertical direction as “edge effect suppression technology”. And a sound absorbing panel formed on the back surface portion can be disposed to reduce the diffracted sound that is diffracted near the upper edge of the uppermost one of the soundproof panels arranged in a plurality of stages in the vertical direction. It has been proposed to do so (see, for example, Patent Document 2).

JP-A-7-300822 International Publication No. 2012/102278

In the above-mentioned proposal, it is considered that the soundproofing wall using the sound absorbing material configured so that both the surface density and the flow resistance become smaller values in the upper part has a higher soundproofing effect (gradation). .
However, the present inventor has found that in the low frequency sound range, the sound reduction effect is hardly increased even if the sound absorbing material is gradationized.

  Accordingly, an object of the present invention is to provide a soundproof wall facility that solves the above-mentioned problems and facilitates the soundproofing effect in the low frequency sound range.

The inventor has invented the following configuration based on the new knowledge that the sound reduction effect in the low frequency sound range is increased by increasing the height of the sound absorbing panel.
According to a first characteristic configuration of the present invention, there is provided a soundproof panel in which a soundproof panel having a back surface opposite to the sound source side formed as a soundproof surface is arranged in a plurality of stages in the vertical direction, and the soundproof panels are arranged in a plurality of stages in the vertical direction. A sound absorbing space with a sound absorbing material is formed inside the uppermost object in the inside, and an outer frame body that can form a partition that separates the sound source and the periphery of the sound source is provided. Soundproof wall equipment to which a sound absorbing surface is provided on the sound source side surface portion and the back surface portion of the outer frame body, and a sound transmitting surface provided with a large number of sound insertion holes that allow sound to enter and exit from the direction. And the said sound-absorbing material consists of a homogeneous thing up and down, and exists in the place which piled up and fixed the several sheet | seat of the said sound-absorbing panel in the state where those surface parts followed the up-down direction.

According to the first characteristic configuration of the present invention, as shown in FIGS. 4 and 5, a plurality of sound absorbing panels are stacked and fixed in a state in which the surface portions thereof are along the vertical direction. There is a sound reduction effect.
That is, as shown in FIG. 6 and FIG. 7, when a plurality of sound absorbing panels made by gradation of conventional sound absorbing materials are stacked and fixed, the sound reduction effect is the reverse effect, and the sound absorbing material is provided with a uniform upper and lower sound absorbing material. The sound reduction effect is low compared to a stack of multiple sound absorbing panels.
In addition, by stacking and fixing a plurality of sound absorbing panels provided with outer frame bodies, it is easy to form a sound absorbing portion for suppressing the edge effect that is formed further above the upper end of the soundproof panel at a stable height. Therefore, high workability can be secured.

  In the second characteristic configuration of the present invention, the sound absorbing material is molded from a porous material made of at least one selected from polyester fiber wool, glass wool, rock wool, urethane foam, and sintered body, The sound source side surface portion and the back surface portion of the outer frame body are formed of a sound-permeable porous planar body.

  According to the second characteristic configuration of the present invention, a lightweight and inexpensive material can be provided by the sound absorbing material comprising at least one selected from polyester fiber wool, glass wool, rock wool, urethane foam, and sintered body. . In addition, the sound source side surface portion and the back surface portion of the outer frame body are formed of a sound-permeable porous planar body, thereby protecting the peripheral surface of the sound absorbing material.

  A third characteristic configuration of the present invention is one type in which the porous planar body is selected from a punching metal, a wire mesh, a cloth, a metal sintered material, a metal panel having a louver or a slit.

  According to the third characteristic configuration of the present invention, a sound absorbing material is obtained by one kind of porous planar body selected from a punching metal, a wire mesh, a cloth, a metal sintered material, and a metal panel having a louver or a slit. Is protected so that the fiber material does not fall apart, and its sound absorbing performance can be maintained.

It is a longitudinal section of soundproof wall equipment. It is a longitudinal cross-sectional view of a sound absorption panel. It is a side view showing experimental equipment. It is a longitudinal cross-sectional view of the soundproof equipment of 1st experimental equipment. It is a graph showing the result of 1st experiment. It is a longitudinal cross-sectional view of the soundproof equipment of 2nd experiment equipment. It is a graph showing the result of 2nd experiment. It is a longitudinal cross-sectional view of the soundproof equipment of 3rd experimental equipment. It is a graph showing the result of 3rd experiment.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, for example, a soundproof wall facility such as a road is provided with panel support H erected at regular intervals along the road so as to separate the road and its periphery on the side of the road. In the longitudinal groove of the steel plate 9, the panels 1 are arranged side by side along the road in a state where the panels 1 are stacked in a plurality of stages in the vertical direction.

[First embodiment]
As shown in FIG. 1 and FIG. 2, the panel 1 is arranged on a concrete foundation outer wall 2 and stacked on a soundproof panel 1A stacked in a plurality of levels in the vertical direction, and further on the topmost object of the soundproof panel 1A. Each soundproof panel 1A and sound absorbing panel 1B is supported by fitting the left and right ends of the sound absorbing panel 1B into the respective vertical grooves of the panel supporting H-shaped steel 9 adjacent in the horizontal direction. ing.

  The sound-absorbing panel 1B is formed by making the sound-absorbing material to be inserted from the same thickness and uniform in the vertical direction without gradation in the vertical direction. They are stacked and fixed along the direction.

  As shown in FIGS. 1 and 2, the soundproof panel 1 </ b> A has a sound absorbing space 4 in which a sound absorbing material 3 made of glass wool, polyester wool, rock wool, or the like is installed, and a road serving as a sound source and the road An outer frame body 5 made of a metal plate that can form a partition wall that can be separated from the surroundings is provided, and a sound transmission surface having a louver structure in which a large number of sound insertion holes are formed in the sound absorbing space 4 so as to be able to take in external sounds. A sound insulation board made of iron plate that is not perforated is provided on the back surface 8 of the outer frame 5 on the sound source side surface portion 7 and opposite to the sound source side of the outer frame 5, The generated sound is configured not to escape to the back side of the soundproof wall.

As shown in FIG. 2, the sound absorbing panel 1B is configured as follows.
That is, the sound absorbing space with the sound absorbing material 10 is formed inside, and the outer frame body 12 that can form a partition wall that separates the sound source and the periphery of the sound source is provided, and the sound enters and leaves the sound absorbing space and the outside thereof. Sound transmitting surfaces provided with a large number of sound insertion holes 6 that enable the sound frame are formed on the sound source side surface portion 13 and the back surface portion 14 of the outer frame body 12.

The outer frame 12 is composed of two or more sheet metal members, and the plurality of sheet metal members are integrally assembled in a box shape by rivets, bolts and nuts, adhesion, welding, or the like.
An aluminum punching metal provided with a large number of sound insertion holes 6 in which external sound can be taken into the sound absorption space of the outer frame body 12, and two surfaces, the front surface and the rear surface of the outer frame body 12, are formed.
In addition, it may replace with the said punching metal, and you may form with the porous planar body which consists of 1 type selected from metal mesh, cloth, a metal sintered material, a metal panel which has a louver and a slit.
The sound absorbing space is internally provided with a sound absorbing material 10 made of polyester (PET) wool. The sound absorbing material 10 is at least one selected from glass wool, rock wool, urethane foam, and sintered body. You may form from the porous material which consists of seeds.
The surface density of the sound absorbing material 10 is set to 0.6 to 100 kg / m ² , and the flow resistance value is set to 50 to 4000 N · s / m ³ .

In the edge effect suppression technology corresponding to the low frequency sound range (63 to 125 Hz), the structure of the soundproof wall equipment was changed, and the sound reduction effect in each was confirmed by the following experiment.
(Experimental equipment)
As shown in FIG. 3, a plurality of sound absorbing panels 1B having a height of 2775 mm (upper end height of the soundproofing panel 1A and a width of 500 mm above and below the soundproofing panel 1A) are provided in a plurality of stages (4 in the figure). The sound source S is arranged on one side (surface side) with respect to the stack (fixed) (the straight line connecting the sound source S and the upper end of the sound insulation panel 1A with respect to the vertical direction surface of the sound insulation panel 1A). The first microphone M5 is installed on the other side (back side) (the angle is 70 °) (the first microphone and the upper end of the soundproof panel 1A are connected to the vertical surface of the soundproof panel 1A). The angle formed by the straight line is 85 °), and the sound received by the first microphone M5 from the sound generated from the sound source S was measured.

(First experiment)
As shown in FIG. 4, the height of the sound absorbing panel 1B per stage is set to 500 mm, and the sound absorbing material 10 having the same shape (equal thickness and uniformity in the vertical direction) is accommodated, and stacking from 1 to 4 stacks is performed. In the state, each sound reduction effect was measured in a low frequency sound region of 63 to 125 Hz.
As shown in the graph of FIG. 5, it is clear that the sound reduction effect increases as the number of stacked layers increases.
From the graph of FIG. 5, it seems that it is effective to obtain a sound reduction effect by stacking three or more sound absorbing panels 1B.
In addition, it is considered that it is more effective to stack four or more stages in a low frequency sound region of 63 Hz or less.

(Second experiment)
As shown in FIG. 6, the sound resistance panel 1B containing a sound-absorbing material having a uniform thickness in the vertical direction and a uniform air resistance value has a variable air resistance value. The comparison of the sound absorbing panel 1C) and a plurality of variable stacking panels 1D having a sound absorbing material containing a sound absorbing material having a constant air resistance and having the air resistance value of the sound absorbing material made smaller as they are stacked on the upper stage.
As shown in the graph of FIG. 7, the measurement results show that the sound absorbing panel 1B has a higher sound reduction effect than the comparative sound absorbing panel 1C in the low frequency sound range (63 to 125 Hz), and the gradation of the sound absorbing material 10 has no effect. Is clear.
Further, it can be seen that the stacked panel 1D has substantially the same sound reduction effect as the sound absorbing panel 1B.

(Third experiment)
As shown in FIG. 8, on the soundproof panel 1A, the first soundproof wall equipment 20 in which the sound absorbing panel 1B is stacked in one stage, the second soundproof wall equipment 21 in which the comparative sound absorbing panel 1C is stacked in one stage, and the sound absorbing panel 1B are arranged in three. Third soundproof wall equipment 22 stacked in stages, fourth soundproof wall equipment 23 in which two sound-absorbing panels 1B are stacked and comparative sound-absorbing panel 1C in the uppermost stage, and fifth soundproof wall equipment 24 in which three-stage comparative sound-absorbing panels 1C are stacked. In each case, the sound reduction effect was measured.
As shown in the graph of FIG. 9, the measurement results show that the first sound barrier equipment 21 and the second sound barrier equipment 22 cannot be expected to have a sound reduction effect, whereas the third sound barrier equipment 22 and the fourth soundproof equipment. It can be seen that the wall equipment 23 and the fifth soundproof wall equipment 24 can expect a sound reduction effect in substantially the same manner.

  From the above experiment, in designing the soundproof wall equipment, in order to obtain the maximum value of the sound absorption effect at 63 to 125 Hz in the area where the sound absorption effect is expected or the target point, the vertical direction surface of the soundproof panel 1A is obtained. Thus, the maximum height of the sound absorbing panel 1B is calculated based on the experimental value corresponding to the angle from the upper end of the soundproof panel 1A to the target point.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

1A Soundproof panel 1B Sound absorption panel

Claims (3)

The sound insulation panel whose back surface opposite to the sound source side is formed as a sound insulation surface is arranged in a plurality of stages in the vertical direction, and further above the uppermost one of the sound insulation panels arranged in a plurality of stages in the vertical direction. In addition to forming a sound absorbing space with a sound absorbing material inside, an outer frame body that can form a partition that separates the sound source and the surroundings of the sound source is provided, allowing sound to enter and exit the sound absorbing space and the outside. A soundproof surface provided with a sound absorbing surface formed on the sound source side surface portion of the outer frame body and a back surface portion, and a sound transmitting surface provided with a number of sound insertion holes,
The sound absorbing material is made of a material that is homogeneous in the upper and lower sides,
A soundproof wall facility in which a plurality of the sound absorbing panels are stacked and fixed in a state where their surface portions are along the vertical direction.   The sound absorbing material is molded from a porous material made of at least one selected from polyester fiber wool, glass wool, rock wool, urethane foam, and sintered body, and the sound source side surface portion and the back surface of the outer frame body The soundproof wall equipment according to claim 1, wherein the portion is formed of a sound-permeable porous planar body.   The soundproof wall equipment according to claim 2, wherein the porous planar body is one selected from a metal panel having a punching metal, a wire mesh, a cloth, a metal sintered material, a louver or a slit.

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