JP2002266322A - Noise reduction device, sound insulation wall provided therewith and its mounting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise reduction device having a property for lowering a high diffracted sound with a simple shape and capable of making an overhang to an sound source side smaller, a sound insulation wall provided therewith and a mounting method capable of easily mounting the noise reduction device on a sound insulating wall within a short time. SOLUTION: The noise reduction device is constituted of a sloping wall mounted around the upper end section of an erected wall erected from the ground and having an inclined face in the opposite side to the sound source with an erected wall surface in the opposite side to the sound source as the starting point and a partition wall provided in a space formed of the erected wall surface in the opposite side to the sound source and the sloping wall to make it display a high sound insulation property. The noise reduction device is mounted to a mounting member, both ends of the mounting member are inserted into a gap between a sound insulation plate and a flange of a strut having an H-shaped section, and it is simultaneously fixed to the strut together with the sound insulation plate with a locking device to easily mount it within a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted along an upper edge of a soundproof wall installed along a highway or a railway to cut off or absorb noise caused by running of a vehicle or the like. The present invention relates to a noise reduction device, a sound insulation wall to which the noise reduction device is attached, and a method of attaching the noise reduction device to the noise insulation wall.

[0002]

2. Description of the Related Art In recent years, there has been a growing interest in pollution caused by noise around roads, and high sound insulation performance is required for sound insulation walls as ancillary equipment for roads. To achieve even better sound insulation performance, increase the thickness of the part that has the sound insulation function in the members that make up the sound insulation wall, or raise the sound insulation wall or incline the upper end toward the sound source side and close to the tunnel There is a method of forming a shape.

[0003] However, increasing the thickness of the portion having the sound insulation function leads to an increase in the weight of the soundproof wall and the cost of the member. In the case where the soundproof wall is already installed, it is necessary to replace the soundproof wall or replace the member by removing it. Becomes In addition, in the method of raising the soundproof wall, not only does the cost increase due to the installation of the soundproof panel, but also the increase in the area of the soundproof wall increases the wind load received by the wall, and the weight of the soundproof wall itself increases. Therefore, the load on the pillars, anchors, wall railings, and the like that support the wall increases, and it may be difficult to cope with the existing foundation by raising the height. Even in the case of a new construction, it is necessary to avoid an increase in extra space and weight as much as possible, which leads to an increase in the size and thickness of the foundation, particularly on a viaduct that requires space saving and weight reduction. Further, various adverse effects such as a problem of sunshine along the road and a feeling of pressure on a driver of a vehicle running on the roadway occur, and the tendency becomes remarkable as the height of the sound insulation wall above the ground increases.

[0004] In addition to the sound wave traveling straight, even when the sound wave from the sound source side is obliquely below the upper end of the upright wall, when the sound reaches the upper end of the wall, a part of the sound wave is on the opposite side of the upright wall from the sound source. Has the property of going diagonally downward. This phenomenon is called diffraction of sound waves, and the sound wave propagated by the phenomenon is called diffracted sound.However, even when a private house exists on the opposite side of the sound source and the sound source and the private house are separated by a soundproof wall, the sound source and the private house are separated. Even if the sound source is located on a viaduct, as well as near the same plane, the diffracted sound will cause the surrounding residents to suffer greater noise damage. Although it is known that the method of providing a double soundproof wall is effective in reducing the diffracted sound, it naturally requires an extra space and a large foundation. Also, maintenance between the double soundproof walls is required.

Therefore, in recent years, noise reduction devices of various shapes are provided at the upper end of the sound insulation wall to achieve the same effect as the case where the sound insulation wall is provided twice, thereby reducing the diffraction sound from the noise source and improving the sound insulation performance. Improvement methods have been applied.

[0006]

However, in the method of providing a noise reduction device having a mere square or T-shaped cross section at the upper end of the soundproof wall, the noise insulation performance has been increased as a measure against the pollution caused by the noise which has been increasing in recent years. Insufficiently, in order to enhance the sound insulation performance, on the contrary, it is necessary to provide a complicated shape such as providing a large number of branch walls, and such a noise reduction device requires complicated and complicated processing. Inevitably, the size of the apparatus is inevitable.

[0007] Further, since there is a possibility that roads and railroads provided with a soundproof wall having a noise reduction device may hinder traffic, the noise reduction device cannot be installed so as to protrude so much to the sound source side. Especially when installing a soundproof wall with a noise reduction device at the upper end along a highway with a narrow roadside zone, when the vehicle approaches the side edge of the road for some reason, the cargo etc. comes in contact There is a possibility that an accident may occur, and it is an essential condition for the vehicle to reduce the protrusion to the sound source side.

In addition, when the noise reduction device is attached to the upper end of the soundproof wall, if the noise reduction device is added to a normal soundproof wall, additional parts and steps for the addition are required, and extra cost and time are required. In order to add noise reduction equipment to existing sound barriers as well as new installations, railways and vehicles are already passing through traffic routes, and installation should be performed during off-hours or when vehicles are installed. You need to regulate traffic,
Prolonged installation will cause traffic confusion, so installation must be completed as soon as possible. There is also a method of replacing only the top sound insulation plate of the sound insulation wall with a sound insulation plate already equipped with a noise reduction device.However, installing a new sound insulation plate and disposing of the removed sound insulation plate is a waste of resources and disposal. Accompanying the occurrence of things.

Accordingly, the present invention is directed to a noise reduction device having a simple shape and high diffraction noise reduction performance and capable of minimizing overhang to the sound source side, a sound insulation wall having the noise reduction device mounted thereon, and a noise reduction device having the same. Another object of the present invention is to provide a mounting method that can be easily and quickly mounted on a soundproof wall without requiring replacement of a sound insulating plate.

[0010]

Means for Solving the Problems As a result of earnest research, the inventors have studied a noise reduction device installed near the upper end of an upright wall standing from the ground, and the upright wall opposite to the sound source. The sound source has high sound insulation performance by being composed of an inclined wall having an inclined surface that is inclined to the opposite side from the sound source, and a partition wall provided in the space formed by the upright wall and the inclined wall opposite to the sound source. We knew that it could be expressed and completed the present invention.

An inclined surface provided at the upper end of the upright wall so as to be inclined to the opposite side to the sound source blocks noise that is diffracted at the upper end of the upright wall and propagates to the opposite side to the sound source, and is formed by the inclined wall and the upright wall. The sound wave is guided downward while making multiple reflections at the groove formed, making it difficult for it to be reflected outside the groove, and the sound pressure energy is lost due to the mutual interference of the sound waves in the groove, so it stands upright from the sound source side It is possible to effectively reduce noise transmitted through a wall and exhibit high sound insulation performance. Further, since the inclined wall forming the outer edge of the noise reduction device projects on the opposite side to the sound source, it is not necessary to provide an extension on the sound source side.

Further, the main structure is only two types of the inclined wall and the partition wall. The device can be formed in a simple shape without much complicated and complicated processing, and the size of the device is very large. There is no need to do it. In addition, by providing a partition wall between the inclined wall and the upright wall, two points at the upper end of the upright wall and the upper end of the partition wall can be set as diffraction points of sound waves, so that noise can be more effectively formed in the noise reduction device. Introduced into the groove, the sound pressure energy is lost and the sound insulation effect can be enhanced.

The inclined wall according to the present invention only needs to have an inclined surface inclined to the side opposite to the sound source, and has an arbitrary angle and length in consideration of the angle of diffraction and the allowable range of the width of the apparatus. It may be a sloped slope. The shape of the inclined wall may be linear, may have a bent portion in the middle, or may have a curved surface as long as the wall has an inclined surface. The partition wall only needs to be present between the upright wall and the inclined wall, and the shape is not particularly limited as long as the sound wave is diffracted, and the lower end thereof is close to or close to the upright wall or the inclined wall. The grooves may be in contact with each other, or may be independently provided in the groove formed by the inclined wall and the upright wall of the groove.

The material forming the inclined wall and the partition wall is not particularly limited, but it is preferable to use a metal material which has good sound wave reflection, is easy to process, and has relatively high durability. Preferably, a steel plate or a plated plate thereof, an aluminum plate, a stainless steel plate, or the like may be used, and these may be bent and combined, or may be formed by integral molding or the like. Further, it may be formed of a synthetic resin, and furthermore, the material itself may have a sound absorbing property.

The inclined wall may have an inclined surface from the upper end to the lower end. Since the entire inclined wall is formed as an inclined surface, when the sound wave introduced into the groove portion is multiply reflected inside the groove portion, it is more difficult to leak out of the groove portion, and furthermore, the sound wave is multiple reflected inside the groove portion. When guided down,
The density of lower sound waves is increased, and mutual interference between sound waves can be further promoted. Even when the entire inclined wall is formed as an inclined surface, the inclination angle does not need to be constant, and may be a shape in which a straight line is bent or an arc shape.

It is preferable that the inclined wall has a ground height at the upper end equal to or higher than the ground height at the upper end of the upright wall.
Raising the upper end of the inclined wall is preferable because the path of sound propagating from the noise source to the side opposite to the sound source can be efficiently shielded. In addition, for the same reason that the upper end of the inclined wall is higher than the upper end of the upright wall, the ground height of the upper end of the inclined wall is preferably equal to or higher than the ground height of the upper end of the partition wall. The ground clearance is preferably equal to or higher than the ground clearance at the upper end of the upright wall.

The partition wall may be made of an upright planar member. The diffracted sound from the upper end of the upright wall is going diagonally downward on the opposite side of the sound source, but the sound wave is reflected by the partition wall and is attenuated while multiple-reflecting downward between the main body wall and the partition wall. Thus, the sound pressure energy of the sound wave can be effectively lost.

The inclined surface of the inclined wall may have an arc shape projecting to the opposite side of the sound source. With the arcuate shape, the sound wave introduced into the groove formed between the main body wall and the groove is less likely to leak outside the groove, particularly in a direction opposite to the sound source. Further, since the introduced sound wave is reflected toward the inside of the arc, mutual interference of sound waves is more effectively performed.

The partition wall may have a lower end connected to the upright wall. By connecting the lower end of the partition wall to the upright wall, a closed space is formed between the partition wall and the upright wall, and the sound waves introduced into the space can mutually interfere.

The partition wall may have an arc shape parallel to the inclined wall and projecting to the opposite side of the sound source. A groove may be formed between the upright wall and the partition wall, and a groove may be formed between the partition wall and the inclined wall so that the sound waves are reflected multiple times inside the two grooves to enhance mutual interference.

The inclined wall may be formed of a material having a sound insulating property, and a sound absorbing material may be adhered to an outer surface on the sound source side. The sound wave introduced into the groove is absorbed by the sound absorbing material, the sound wave reflected on the inner surface of the inclined wall and leaking to the outside of the groove can be reduced, and the sound insulation performance can be further improved. As the material having sound insulation properties, it is preferable to use a metal material having good sound wave reflection properties. Preferably, as described above, a steel plate or a plate plated thereon, an aluminum plate, a stainless steel plate, or the like may be used.

A sound absorbing material may be attached to at least one surface of the partition wall. By attaching the sound absorbing material to the sound source side of the partition wall, the sound wave introduced between the upright wall and the partition wall is absorbed by the sound absorbing material, and the sound absorbing material is attached to the partition wall on the opposite side to the sound source. In this case, the sound wave introduced between the partition wall and the inclined wall is absorbed by the sound absorbing material, and the sound insulation performance can be improved.

Examples of the sound absorbing material to be attached include rock wool, glass wool, felt, resin or concrete foam, metal fiber bonded via a binder, metal powder and particles, ceramic powder and particles, and metal shorts. A material made of a sintered material obtained by sintering fibers, a porous ceramic, an aggregate of polyester fibers, or the like may be used.
Also, the durability may be enhanced by wrapping with a thin film that does not significantly affect the sound absorbing performance.

The noise reduction device according to the present invention is mounted on an upright wall to form a sound insulation wall. The upright wall may be a plate made of metal, inorganic material, or the like having no opening, and may be used for sound absorption or sound absorption. It may have a light transmitting property, and is not particularly limited. The noise reduction device is installed on the upper end of the upright wall on the opposite side of the sound source, so that even if the upright wall has sound absorption or translucency, it can be installed without substantially impairing its performance. is there.

The inclined wall and the partition wall may be directly fixed near the upper end of the upright wall using a fastening means such as riveting or bolting to form a sound insulation wall to which a noise reduction device is added. By using such a method, the material required for the noise reduction device can be extremely reduced. Further, the partition wall may be fixed to the upright wall and / or the inclined wall via a mounting member or the like.

The inclined wall and the partition wall may be fixedly integrated with a mounting member using a fastening means or the like, and may be further mounted near the upper end of the upright wall by a fastening means or the like. Is less complicated and the construction time is shorter.

The upright wall has a sound insulating plate sandwiched between flanges of a column having an H-shaped cross-section, which is erected at a predetermined interval, and the column and the sound insulating plate are fixed by locking members. In the case, the length of the mounting member is equal to the length of the sound insulating plate, and both ends of the mounting member are inserted into the gap between the sound insulating plate and the flange of the column having the H-shaped cross-section, and are fixed to the support simultaneously with the sound insulating plate by the locking device. The structure may be fixed. By using such a method,
The noise reduction device can be installed at the same time as the installation of the sound insulation wall, and the noise reduction device can be mounted extremely efficiently in a short time. Also in the existing soundproof wall, the noise reduction device is easily fixed by removing the locking device, inserting the noise reduction device, and then attaching the locking device again, and does not require an extra member for mounting. As the locking member, a metal spring, rubber packing material, press-fitting by screwing in a bolt, or the like may be used, and both ends of the mounting member have a spring-like shape, and also serve as the locking member. It may be.

It is preferable to provide a cover having an opening on the upper surface for the purpose of preventing dust, falling leaves, animals, and the like from entering the groove formed by the upright wall and the inclined wall and lowering the sound insulation performance. The cover only needs to have an opening large enough to prevent intrusion of dust, animals, etc., and to maintain the introduction of diffracted sound into the groove, and to provide a net fence, punching plate, slit plate, etc. It is suitable.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. An arc-shaped inclined wall 21 projecting to the side opposite to the sound source side a of the sound insulating plate 1, and is provided between the inclined wall 21 and the sound insulating plate 1, projects to the opposite side to the sound source side a, and is parallel to the inclined wall 21. The formed arcuate partition wall 22 is attached to an attachment member 23 to form the noise reduction device 2, and the noise reduction device 2
Is attached to the sound insulating plate 2 by an attachment member 23. The side where the sloping wall 21 protrudes is the opposite side b to the sound source.
Since there is an urban area or a private house in that direction, a colored or patterned vinyl chloride film, fluororesin film, or the like is attached to the surface 211 of the inclined wall opposite to the sound source. It may be a cosmetic surface to improve the aesthetic appearance.

When the sound insulating plate 1 is supported by a column having an H-shaped cross section, the sound insulating plate 1 may be mounted using the above mounting method, or may be mounted by a fastening means such as a bolt or a screw. A method of attaching to the plate 1 may be used. In this embodiment, the sound insulating plate 1 and the inclined wall 21 are used.
Although the upper end of the partition wall 22 has substantially the same ground height, the ground height of the upper end of the inclined wall 21 and the partition wall 22 may be higher than the ground height of the upper end of the sound insulating plate 1. The ground height at the upper end of the wall 21 may be higher than the ground height at the upper end of the partition wall 22.

FIG. 2 shows an embodiment of the present invention. An arc-shaped inclined wall 21 projecting from the sound insulating plate 1 on the opposite side to the sound source side a, and an upright flat partition wall 22 provided between the inclined wall 21 and the sound insulating plate 1 is provided with a mounting member 23.
The partition wall is fixed to a position independent of the inclined wall 21 and the mounting member 23 by a fixing member (not shown). The noise reduction device 2 is attached to the sound insulating plate 1 by a member 23 for attachment. FIG. 1 shows the method of mounting the sound insulating plate 1 and the ground height of the upper end of the sound insulating plate 1, the inclined wall 21, and the partition wall 22.
May be the same as the embodiment shown in FIG.

FIG. 3 shows an embodiment of the present invention. The arc-shaped inclined wall shown in FIG. 2 has a straight shape bent in the middle. The inclined wall 21 has an upper part standing upright in parallel with the upright wall and a lower part having an inclined surface. Other parts may be the same as the embodiment shown in FIG.

FIG. 4 shows the noise reduction device shown in FIG. 1 in which the sound absorbing material 3 is provided on the inclined wall 21 and the partition wall 22 on the sound source side.
Is attached. The sound wave diffracted at the upper ends of the sound insulating plate 1 and the partition wall 22 is introduced into a groove formed by the inclined wall 21 and the partition wall 22, causing mutual interference and converting sound pressure energy into heat energy by the sound absorbing material 3. In addition, the sound pressure is attenuated and the sound pressure of the sound wave leaking to the outside is reduced, so that the sound insulation effect is improved. The thickness of the sound absorbing material may be appropriately set in consideration of the sound absorbing performance, the depth of the groove, the cost, and the like. In the present embodiment, the sound absorbing material 3 is attached to almost the entire sound source side of both the inclined wall 21 and the partition wall 22 to reduce the sound wave reflection surface, but the surface of the partition wall 22 on the side opposite to the sound source. The sound absorbing material may be stuck to 221, or a part of the sound absorbing material may be stuck to almost all of the surfaces, but not to the entire surface, and this may be appropriately determined in consideration of sound absorbing performance, cost, and the like. Good.

FIG. 5 shows the noise reduction device shown in FIG. 2 in which the sound absorbing material 3 is attached to the surface of the inclined wall 21 on the sound source side. The operation and effect of the sound absorbing material 3 attached are the same as those described in the embodiment shown in FIG. The thickness of the sound absorbing material 3 may be appropriately set in consideration of the sound absorbing performance, the depth of the groove, the cost, and the like. In the present embodiment, the inclined wall 2
Although the sound absorbing material is adhered to almost the entire surface on the sound source side to reduce the sound wave reflection surface, the sound absorbing material may be adhered to any one of the surfaces of the partition wall 22. A sound absorbing material may be attached to both sides of the 22. In addition, a sound absorbing material may be attached to a part of each surface, not to the whole, and may be appropriately determined in consideration of sound absorbing performance, cost, and the like.

FIG. 6 shows a modification of the embodiment shown in FIG. 4, in which a cover 4 made of a punching plate is provided above the sound insulating plate 1 and the noise reduction device 2. The lid 4 prevents dust, leaf fall, animals, and the like from entering the groove of the noise reduction device 2, and the opening of the cover 4 by punching can reduce interference with the sound wave entering the groove of the noise reduction device 2. . In addition, the sound wave that has once entered the groove portion reflects the sound wave going to the outside of the groove portion, which may contribute to the improvement of the sound insulation effect. In addition, as a series of modifications, a mode in which a lid is provided without attaching the sound absorbing material 3 may be adopted.

FIG. 7 is a modification of the embodiment shown in FIG. 5, in which a lid 4 made of a punching plate is provided above the sound insulating plate 1 and the noise reduction device 2. The operation and effect of the lid 4 are the same as those of the embodiment shown in FIG. In addition, as a series of modifications, a mode in which a lid is provided without attaching the sound absorbing material 3 may be adopted.

Hereinafter, a method of mounting the noise reduction device will be specifically described with reference to the drawings. The sound insulating wall is one in which a sound insulating plate is sandwiched between flanges of pillars having an H-shaped cross section that are erected at predetermined intervals and fixed by a locking spring.

As shown in FIG. 8, first, the locking spring 6 inserted between the upper end of the sound insulating plate 1 and the column is pulled out. Then, the flange 5 of the support column corresponds to the space where the locking spring was contained.
A gap is generated between the sound insulation plate 1 and the sound insulation plate 1. Next, as shown in FIG. 9, both ends of the mounting member 23 of the noise reduction device 2 are inserted into the gap. In the noise reduction device 2, a fixing member 24 is provided between the inclined wall 21 and the partition wall 22, and in this embodiment, a cover member that covers the upper end of the sound insulating plate 1 above the mounting member 23. 25 are provided. The inclined wall 21, the partition wall 22, the attachment member 23, and the cover member 25 are integrated in advance by fastening means or the like via a fixing member 24.

After inserting both ends of the mounting member 23 of the noise reduction device 2 into the gap between the flange 51 of the column having the H-shaped section and the sound insulating plate 1, the locking spring 6 is mounted as shown in FIG. . Since the locking spring 6 once removed in FIG. 6 can be used again, the noise reduction device 2 can be attached without requiring a new member. The locking spring 6 is inserted into the gap between the flange 51 of the column having the H-shaped section and the sound insulating plate and the sound insulating plate is fixed, but the folded portion of the cover material 25 is also sandwiched between the locking spring 6 and the sound insulating wall 1. At the same time,
The noise reduction device 2 does not rattle. The noise reduction device 2 is positioned up and down by the cover member 25 together with the fixing.

Finally, as shown in FIG. 11, a lid 4 having been punched is attached. The attachment of the lid 4 is performed to improve the appearance and prevent intrusion of dust, animals, and the like, and is not always necessary as a soundproof wall. In mounting the lid 4, the upper part of the fixing member 24 also serves as a receiving member, and the fixing member 24
May be fixed by fastening means such as bolts and screws.

[0042]

Embodiments of the present invention will be described below. FIG. 12 shows a schematic diagram of the acoustic performance measurement in the present embodiment. A noise reduction device is provided on the sound-insulating wall 10 which is a reflector, and a sound source 11 is provided at a point 50 m above the ground 7.5 m away on one side with the sound-insulating wall therebetween, and 20 on the other side.
A microphone 12 is installed at a point 1.2 m above the ground at a distance of m and the sound pressure level is measured. The maximum width of the noise reduction device 2 in the vertical and horizontal directions is 50 cm, and the height above the soundproof wall including the noise reduction device is 3.125 m. The sound insulation wall is formed by stacking a plurality of sound insulation plates, each having a thickness of 95 mm and used as a sound wave reflector, which are generally used on an expressway.

(Embodiment 1) The noise reduction device 2 shown in FIG.
At the upper end of the soundproof wall 10. Inclined wall 21
The partition wall 22 is formed of a galvanized steel sheet having a thickness of 1.6 mm to serve as a sound wave reflector. The radius of curvature of the inclined wall is 500 mm. The ground height at the upper end of the inclined wall 21, the partition wall 22, and the sound insulating plate 1 is substantially the same, and the ground height at the upper end at the time of measurement is 3.125 m. The height from the upper end to the lower end of the noise reduction device 2 itself is 50 cm, and the distance from the front surface of the sound source 1 on the sound source side a to the maximum overhang portion of the noise reduction device 2 to the opposite side b from the sound source is 50 cm. .

(Embodiment 2) The noise reduction device 2 shown in FIG.
At the upper end of the soundproof wall 10. Partition wall 22
Has the same configuration as that of the first embodiment, except that is an upright flat plate.

(Embodiment 3) The noise reduction device 2 shown in FIG.
At the upper end of the soundproof wall 10. Inclined wall 21
And glass wool (thickness 50) on the sound source side surface of the partition wall 22.
mm, density 32 kg / m ³ ) The sound absorbing material 3 is attached.
Otherwise, the configuration is the same as that of the first embodiment.

(Embodiment 4) The noise reduction device 2 shown in FIG.
At the upper end of the soundproof wall 10. Inclined wall 21
Of glass wool (thickness 50 mm, density 32
kg / m ³ ) The sound absorbing material 3 is stuck. Otherwise, the configuration is the same as that of the second embodiment.

(Comparative Example 1) A noise reduction device 2 having a square cross section shown in FIG. 13 was installed at the upper end of a soundproof wall. The noise reduction device 2 of this comparative example has a hollow inside, but the outer shell is formed of a 1.6 mm-thick galvanized steel plate and serves as a sound wave reflector. The upper and lower sides and the left and right sides of the square section are 50 cm in length, and the height above the upper end when attached to the soundproof wall 10 is 3 m.

(Comparative Example 2) A noise reduction device 2 having a horizontally long rectangular cross section shown in FIG. Noise reduction device 2 as in Comparative Example 1
Although the inside is hollow, the outer shell is made of a galvanized steel sheet having a thickness of 1.6 mm, and is used as a sound wave reflector. The left and right sides of the horizontally long rectangular section are 50 cm long, and the top and bottom are 1 length.
Although it is 0 cm, the ground clearance at the upper end when attached to the soundproof wall is 3 m.

(Comparative Example 3) A noise reduction device 2 having a cross-sectional shape of an inverted isosceles triangle shown in FIG. The inclined surface of the inverted isosceles cross section toward the sound source has a function of reflecting sound pressure from below the sound source. As in Comparative Example 1, the noise reduction device is hollow inside but the outer shell is formed of a galvanized steel sheet having a thickness of 1.6 mm, and serves as a sound wave reflector. The upper left and right sides of the inverted isosceles triangular cross section have a length of 50 cm, and the lower left and right sides have the same 95 mm length as the sound insulating plate. The upper and lower sides are 50 cm long, and the height above the top when attached to the soundproof wall is 3 m.
It is.

FIG. 16 shows the sound insulation performance of a sound insulation wall (hereinafter referred to as a “single wall”) using the same sound insulation plate 1 as that used in the examples and comparative examples and having no noise reduction device at the upper end. The height of the ground at the upper end of the soundproof wall 10 is 3.125 as in the case where the noise reduction device 2 is provided.
m, and the positions of the sound source 11 and the microphone 12 are shown in FIG.
The condition is the same as the condition shown in FIG. FIG. 17 shows a method of measuring the sound insulation performance in a state where the single walls shown in FIG. 15 are double-installed at an interval of 50 cm (hereinafter, referred to as “double walls”). For each of the example and the comparative example, a frequency of 125 Hz
The sound insulation performance was measured in the range of 4 kHz, and the measured sound pressure was 1
Compared to single wall and double wall every オ ク タ octave band,
Table 1 shows the average. These numbers are 1
For every オ ク タ octave band, the actual measurement value obtained by the measurement using the single wall and the double wall is divided from the actual measurement value obtained by the measurement using the example and the comparative example, and the numerical value is high. In other words, it has higher sound insulation performance.
The numerical values of the measurement results are all A
This is the result of characteristic correction.

[0051]

[Table 1]

In each of the embodiments, although there is no overhang to the sound source side and the reflection of the sound wave from below the sound source side of the soundproof wall cannot be expected, the value is significantly higher than that of the comparative example. It is recognized that the sound insulation performance of the sound insulation wall can be greatly improved by reducing the diffracted sound by showing the same or higher sound insulation performance than the case where the sound insulation wall is not provided twice. In addition, a remarkable effect was observed when the sound absorbing material was adhered in comparison with any of Examples 1 and 3 and Examples 2 and 4.

When Examples 1 and 3 are compared with Examples 2 and 4, a case where the partition wall is an upright flat plate as in Examples 2 and 4 and the partition wall is independent of the sound insulation plate and the inclined wall is shown. Shows higher sound insulation performance. The reason for this is not clear, but since the partition wall is provided independently, the sound wave that enters the groove of the sound insulating plate and the partition wall and is guided downward while reflecting is generated by the groove formed by the inclined wall. The sound wave introduced between the inclined wall and the partition wall causes mutual interference with the sound wave, and the sound pressure is lost. Also, the sound wave once introduced leaks upward due to the upright partition wall. It can be spicy.

[0054]

According to the present invention, an inclined surface provided at the upper end of the upright wall so as to be inclined to the side opposite to the sound source blocks noise that is diffracted at the upper end of the upright wall and propagates to the opposite side to the sound source. The sound wave is guided downward while making multiple reflections at the groove formed by the wall, making it difficult for the sound to be reflected to the outside of the groove. In addition, mutual interference of the sound waves occurs in the groove and the sound pressure energy is lost. This effectively reduces the noise that is transmitted through the upright wall from above and can exhibit high sound insulation performance. Further, since the inclined wall forming the outer edge of the noise reduction device projects on the opposite side to the sound source, it is not necessary to provide an extension on the sound source side.

Furthermore, the main configuration is only two types of the inclined wall and the partition wall, and the device can be formed in a simple shape without much complicated and complicated processing, and the size of the device is very large. There is no need to do it. In addition, by providing a partition wall between the inclined wall and the upright wall, two points at the upper end of the upright wall and the upper end of the partition wall can be set as diffraction points of sound waves, so that noise can be more effectively formed in the noise reduction device. Introduced into the groove, the sound pressure energy is lost and the sound insulation effect can be enhanced.

The upright wall has a sound insulating plate sandwiched between flanges of a column having an H-shaped cross-section, which is erected at a predetermined interval, and the column and the sound insulating plate are fixed by locking members. In this case, by using the mounting method according to the present invention, the noise reduction device can be installed at the same time as the installation of the sound insulating wall, and the noise reduction device can be mounted extremely efficiently in a short time. Also, in the existing soundproof wall, the noise reduction device is easily fixed by removing the locking device, inserting the noise reduction device, and then attaching the locking device again, and does not require an extra member for mounting. .

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 2 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 3 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 4 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 5 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 6 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 7 shows an example of an embodiment of a noise reduction device according to the present invention.

FIG. 8 shows a starting stage of an example of a method for mounting the noise reduction device according to the present invention.

FIG. 9 shows a next stage of an example of a method of mounting the noise reduction device shown in FIG.

FIG. 10 shows a next stage of an example of a method of mounting the noise reduction device shown in FIG.

FIG. 11 shows a next stage of an example of a method of mounting the noise reduction device shown in FIG.

FIG. 12 shows a state of sound insulation performance measurement in Examples and Comparative Examples according to the present invention.

FIG. 13 shows an example of a noise reduction device for comparing sound insulation performance with the present invention.

FIG. 14 shows an example of a noise reduction device for comparing sound insulation performance with the present invention.

FIG. 15 shows an example of a noise reduction device for comparing sound insulation performance with the present invention.

FIG. 16 shows a state of sound insulation performance measurement of a single wall.

FIG. 17 shows a state of sound insulation performance measurement of a double wall.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sound insulation plate 11 support 2 noise reduction device 21 inclined wall 211 surface of inclined wall opposite to sound source 22 partition wall 221 surface of partition wall opposite to sound source 23 mounting member 24 fixing member 25 cover material 3 sound absorbing Material 4 Lid 51 Flange of pillar with H-shaped cross section 10 Soundproof wall 11 Sound source 12 Microphone

[Procedure amendment]

[Submission date] March 27, 2001 (2001.3.2)
7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 16

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kensuke Ikenaga 731-1 Yida, Ryuo-cho, Gamo-gun, Shiga F-term (reference) in Sekisui Jushi Corporation 2D001 AA01 BA01 BB01 CA02 CD03 CD05 5D061 BB01 BB37

Claims (14)

[Claims] 1. An apparatus for reducing noise mounted near the upper end of an upright wall that is erected from the ground, the inclined surface being inclined from the upright wall opposite to the sound source to the opposite side to the sound source. And a partition wall provided in a space formed by the upright wall and the inclined wall opposite to the sound source. 2. The noise reduction device according to claim 1, wherein the inclined wall has an inclined surface from an upper end to a lower end. 3. The noise reduction device according to claim 1, wherein the inclined wall has a ground height at an upper end higher than a ground height at an upper end of the upright wall. 4. The noise reduction device according to claim 1, wherein the partition wall is made of an upright planar member. 5. The noise reduction device according to claim 1, wherein the partition wall is not connected to the inclined wall and the upright wall. 6. The noise reduction device according to claim 1, wherein the inclined surface has an arc shape protruding on a side opposite to the sound source. 7. The noise reduction device according to claim 1, wherein a lower end of the partition wall is connected to an upright wall. 8. The method according to claim 1, wherein the partition wall has an arc shape projecting to a side opposite to the sound source and is parallel to the inclined wall. The noise reduction device as described. 9. The inclined wall according to claim 1, wherein the inclined wall is formed of a material having a sound insulating property, and a sound absorbing material is adhered to an outer surface on a sound source side. Noise reduction device. 10. The partition wall, wherein a sound absorbing material is stuck on at least one surface.
The noise reduction device according to any one of claims 1 to 7. 11. A sound insulation wall, wherein the noise reduction device according to claim 1 is directly attached to an upright wall using a fastening means. 12. The sound insulating plate is sandwiched between flanges of a post having an H-shaped cross section in which upright walls are erected at predetermined intervals, and wherein the sound insulating plate is held therebetween. The noise reduction device is mounted on a mounting member, and both ends of the mounting member are inserted into the gap between the flange of the H-shaped cross-section column and the sound insulating plate, and the sound insulating plate and the noise reduction are performed by the locking member. A sound insulation wall, wherein the device is fixed to a support. 13. A mounting method, wherein the noise reduction device according to claim 1 is directly mounted on an upright wall using a fastening means. 14. An upright wall, wherein a sound insulating plate is sandwiched between flanges of a column having an H-shaped cross section which is erected at predetermined intervals. The noise reduction device according to the above is mounted on a member for mounting, after inserting both ends of the mounting member into the gap between the flange of the pillar of the H-shaped cross section and the sound insulating plate, the sound insulating plate and A method for mounting a sound insulating wall, comprising fixing a noise reduction device to a support.