JPS5942764B2 - soundproof wall - Google Patents

Description

[Detailed Description of the Invention] In recent years, the present invention relates to soundproof walls that are often used along Shinkansen or expressways for the purpose of preventing noise pollution caused by vehicles traveling on these lines to residents living along these lines. To provide a soundproof wall that eliminates the feeling of pressure on drivers and passengers caused by traveling in a space enclosed by walls, allows them to enjoy the scenery along the railway line, and at the same time can be expected to have an effective soundproofing effect against noise. .

Conventionally, the structure of soundproof walls, which are often used to prevent noise from vehicles traveling on Shinkansen trains or expressways, etc., focuses on the sound insulation properties of soundproof walls, and is based on the so-called wall theory. A large number of unit walls 1 as shown in FIG. 1 are connected to form an integrated wall-like soundproof wall.

Therefore, in order to effectively reduce the propagation energy of noise from vehicles, etc. into the living spaces of people living along the railway line, the height h of the fence, that is, the soundproof wall, should be as high as possible; The horizontal length of the wall must be extremely long in order to prevent the influence of sound waves from going around.Furthermore, in order to prevent sound from leaking between each unit wall, the joints between each unit wall should also be covered with supports. 2, and are in close contact with each other to form an integral structure as much as possible.

For this reason, the space surrounded by the soundproof wall becomes a closed space completely cut off from the view of Shinkansen trains, expressways, etc., and the driver of the vehicle traveling in this closed space or the For passengers, not only do they lose the ability to appreciate the scenery that unfolds along the railway line, but they also lose the sense of speed that they unconsciously control due to the relative relationship with the outside scenery, which poses a serious danger to vehicle operation, and is even more bland and simple. Continuation of the wall surface in this form causes serious problems such as giving the driver or passengers a feeling of pressure and making them drowsy.

The present invention provides a soundproof wall structure that eliminates various drawbacks caused by the conventional soundproof wall structure and maintains the soundproofing effect.

The present invention is based on the effective combination of the basic properties of sound wave propagation, sound absorption, and sound insulation, and the physiological properties of human vision to overcome the various drawbacks mentioned above.

In other words, it is well known that there is a so-called afterimage phenomenon in the human visual sense, in which even if a continuous image is replaced with a series of very short divided images, the human perceives it as a continuous image. That's true.

On the other hand, the driver or passenger of the vehicle (hereinafter referred to as the passenger)
It is said that while driving a normal vehicle, the visual angle is approximately 120 to 160 degrees, although there are slight differences depending on the speed of the vehicle or the degree of fatigue. It can be considered that we are paying attention to objects within our visual range, whether or not we are aware of them.

For this reason, if there is a monotonous closing wall at close range within this viewing angle range, it can be considered that the dissatisfaction of not being able to see the scenery along the railway line, as well as physiological problems such as a feeling of pressure or eye fatigue, will occur. I can do it.

On the other hand, the sound generated by a vehicle (hereinafter referred to as a vehicle) traveling on a Shinkansen or expressway, etc., propagates through space in the form of a spherical wave with the vehicle as the center, and goes straight to the soundproof walls installed along the line. It is thought that a soundproof wall, whose inner surface is usually sound absorbing, absorbs and insulates the acoustic energy and transmits it to the side along the railway.

Therefore, the soundproof wall body of the present invention, as shown in the overall configuration in FIG. , see-through slit 4 designed to enlarge the exit side of the noise
By doing so, the occupants of the traveling vehicle can view the continuous scenery along the railway line by dividing it into a large number of perspective slits.

In this case, the scenery viewed through the see-through slit 4 is divided by the continuous opaque unit soundproof wall 3, but the distance between the slits and the length of the opaque unit soundproof wall is divided By setting the blocking of the perspective image by the opaque soundproof wall as seen by the occupants traveling at the same speed as the vehicle within the range of the visual afterimage effect, the effect of the opaque unit soundproof wall can be minimized on the perspective image. It can be observed without being exposed to sound, and the problems that occur with conventional soundproof walls can be resolved.

Therefore, the horizontal length L and the perspective slit width d of the unit soundproof wall are appropriately set depending on the speed of the vehicle traveling on the Shinkansen or expressway, and the relationship is determined by the speed of the vehicle and the visual afterimage. Set based on time.

Next, one embodiment of the structure of a soundproof wall body according to the present invention will be described with reference to FIG.

In FIG. 3, 5a and sb are sound insulating bodies made of sound insulating materials such as metal and wood, which form an outer shell for space A where the noise source exists.

6a and 6b constitute an inner wall for the noise generating space A with a sound-transparent material having perforated panels or sulins (7a and 7b) that are integral with the outer shell and constitute an inner shell;
In contrast to the outer wall surface 5b made of the sound insulating material, the inner wall surface 6
By increasing b, the entrance width d of the see-through slit can be increased.
Therefore, the configuration is such that d□ in the exit is made larger.

Reference numeral 8 denotes a sound-absorbing material installed inside the unit soundproof wall body 3.

The see-through soundproof wall body according to the present invention has the unit soundproof wall body 3a having the above configuration maintained by 9 connected bodies to maintain the slit width d in the direction of the viewing angle θ in the traveling direction of the vehicle, and one end of each unit soundproof wall body. are arranged in such a way that they overlap each other in a plane.

In this way, the perspective image of space B seen from space A is created by enlarging the slit and the exit side of the perspective slit to expand the perspective field due to the afterimage effect of human vision as described above. To reduce the feeling of oppression and fatigue of a vehicle driver or passenger from a soundproof wall.

On the other hand, the noise generated in space A and reaching the slit indicated by the dotted line A can be prevented by directly penetrating acoustic energy by arranging one end of each unit soundproof wall so that they overlap each other in a plane. By blocking the sound and first reaching the surface of the sound-transmitting material 6a that constitutes the inner wall surface of the slit, some of the sound is reflected at this surface, but most of it is propagated into the sound-absorbing material filled in the unit soundproof wall. The sound is muted.

The acoustic energy partially reflected on the surface 6a is re-reflected on the surface of the sound insulating material that faces the sound absorbing surface and through the slit widths d and do, and reaches the surface of the acoustically transparent material 6a again, resulting in the above-mentioned sound deadening effect. By repeating this process, the acoustic energy is gradually consumed and transmitted to space B, so that the noise transmitted from space A can be extremely effectively reduced.

In addition, the noise that directly reaches the inner side surface 6b of the unit soundproof wall penetrates the sound-transmitting material that constitutes the inner surface of the paper, is absorbed by the sound-absorbing material 8 filled inside, and is further absorbed by the sound-absorbing material 8 filled inside the outer shell sound-insulating material 5a. 5b, the transmission of sound to space B is completely blocked.

In addition, for noise transmitted directly parallel to the slit, the wavelength of sound (approximately 340 crn at 100 Hz,
Even at 1000 Hz, the width of the slit is made smaller compared to the width of about 34 cm.In addition to the sound absorption and diffraction effects of the sound-absorbing surface inside the slit, the principle of muffler muffler sound deadening (transmission of acoustic energy in noise transmission space A) The amount of attenuation is
The transmitted sound is attenuated by the ratio D2/D1 of the area D1 and the area D2 of the slit surface, and an extremely high sound reduction effect can be obtained.

As explained above, the soundproof wall body according to the present invention expands the field of view in the direction of travel of the vehicle, relieves the occupants from pressure and fatigue caused by the soundproof wall, and at the same time reduces the propagation of sound waves against vehicle noise. An effective soundproofing effect can be provided by an effective combination of the basic properties of the material and sound absorbing and soundproofing materials, and the effect is great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional soundproof wall for expressways, FIG. 2 is a schematic configuration diagram of a soundproof wall in an embodiment of the present invention, and FIG. 3 is a sectional view. 3...Unit soundproof wall body, 4...See-through slit, 8...Sound absorbing material.

Claims (1)

[Claims] 1. A sound insulating and sound absorbing body unit formed by combining a sound insulating structure and a sound absorbing structure is connected to each other through transparent slits at regular intervals, and the transparent direction of the transparent slits is The noise is deflected in the maximum viewing angle direction in the direction of travel of the vehicle driver or passenger, and the slit width is a soundproof wall whose exit width is larger than the entrance width of the noise. 2. The sound-insulating wall according to claim 1, wherein the sound-insulating sound-absorbing body unit has an inner surface of the slit as a sound-absorbing surface, an opposite wall surface as a sound-insulating surface, and a sound-absorbing material filled inside.