JP3045029B2 - Noise barrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof wall used as a soundproof wall for preventing traffic noise such as roads and railways, or for reducing noise from general noise sources.

[0002]

2. Description of the Related Art Conventionally, as a soundproof wall installed on a road and a railway line to prevent noise of a running vehicle, for example, there is a soundproof wall described in Japanese Patent Application Laid-Open No. 52-135531 (hereinafter referred to as prior art A). . In the publication, a traffic lane is covered with a soundproof wall in a tunnel shape to form a tube road, and is divided into a plurality of unit travel lanes by a central partition wall, and the soundproof wall covering each unit travel lane has an axial opening. The opening is a vertical center line, the noise prevention device in a tube road with an opening angle of 30 degrees or less with a line connecting the intersection of the center line with the road surface and the edge of the opening, It is described that both a soundproofing effect and a ventilation effect are provided. Japanese Utility Model Laid-Open Publication No. 3-99017 (hereinafter referred to as "prior art B") discloses that, in a soundproof fence installed on a road, a railroad, or the like, the surface of the fence body on the noise source side is concavely curved in a vertical parabolic curve. Thus, it is described that noise can be reflected parallel to or toward the track surface of a road, a railway, or the like, and the reflected sound that goes outside beyond the upper part of the soundproof fence can be suppressed. ing. Furthermore, what is referred to as unified sound barrier as shown in FIG. 3 (a) ~ FIG 3 (c) has been put into practical use. Incidentally, FIGS. 3 (a)
3 (c), reference numeral 1 denotes a soundproof wall.

[0003]

However, the prior arts A and B and the unified soundproof wall as described above have the following problems. (1) The sound generated from the vehicle is reflected on the soundproof wall and reaches the sound receiving point. In particular, even in a unified soundproof wall that originally should have sound absorption performance, a frequency region with a small sound absorption coefficient, Originally, a translucent plate made of acrylic or glass having almost no sound absorbing effect has a large contribution ratio of the reflected sound to the sound receiving point. Also, in a parabolic soundproof wall as in the prior art B, when the sound source is out of focus, there is a possibility that the reflected sound may come out of the wall. Further, at the time of construction, the width is made small so that the panel as a wall material can be smoothly dropped into the groove between the columns having a small arc curvature. Then, the contact portions between the panels of the constructed curved wall are in line contact with each other, so that the appearance from the outside of the wall is poor, dust and dirt are easily accumulated, and cleaning is difficult. (2) Diffraction sound easily reaches the sound receiving point, and the diffraction attenuation effect is small. (3) In order to make up for the drawbacks of (1) and (2) above, it is a fact that the wall height is increased or the overhanging portion of the wall is lengthened. The present invention has been made to solve the above problems,
The sound reduction effect is large without increasing the structure scale,
It is another object of the present invention to provide a soundproof wall having excellent workability in construction.

[0004]

A first aspect of the soundproof wall according to the present invention is to focus on a noise source side and reflect noise so as to block a noise source and a surrounding area on a road or a railway line.
The cross-sectional shape of the surface to be
The wall has an elliptical wall standing upright. The second invention is, to intercept the noise source and the perimeter road or railway, when the noise source side focus Tomo
The cross-section of the noise-reflecting surface is more
The back of an oval-shaped wall so that it overhangs to the side
An overhang is provided on the side . In addition, the third invention is:
Crossing a surface that reflects noise while focusing on the noise source side so as to block the noise source and the surrounding area to the road or railway line
Shape overhangs on the road side rather than vertically
Sound absorption between soundproof walls overall height erected opposite walls of the oval in
The part is provided in a direction perpendicular to the road surface . Also, the fourth
The invention of the present invention focuses on the noise source side and reflects the noise so as to block the noise source and the surrounding area on the road or railway line .
Crossover on the road surface side than the vertical direction
With an overhang on the back side of the elliptical wall
The sound absorbing portion is provided between the soundproof walls in a direction perpendicular to the road surface . According to a fifth aspect of the present invention, a sound absorbing process is performed on an edge portion of the soundproof wall.

[0005]

In the case of a soundproof wall provided between a vehicle and other general noise sources and the surrounding area, the sound pressure level value at the sound receiving point is determined by the distance attenuation and the diffraction attenuation of the direct sound and the reflected sound. The contribution ratio of the direct sound and the reflected sound to the sound receiving point differs depending on the location of the sound receiving point. One example is shown in FIGS. 4 to 9 and FIGS. 10 to 14 . The relationship between the sound source and the measuring position when the distance between the sound source and the sound barrier is close is as shown in FIG. 5, numerical simulations of this case is 6-9. The relationship between the sound source and the measurement position when the distance between the sound source and the sound barrier is far is as shown in FIG. 10, numerical simulations of this case is 11
14 to FIG. These measuring points (sound receiving point) in FIG. 5 position and 10 represented by coordinate number 11 to 45 in FIG. 5
At the same position . The measurement takes into account the distance attenuation from the sound source and the diffraction attenuation, and compares the sound pressure levels at various locations outside the wall. 6 to 9 (the two-digit number on the left shoulder is the coordinate number in each figure) and FIGS. 11 to 14 (the two-digit number on the left shoulder is the coordinate number in each figure), it is clear from the wall Thus, it can be seen that the contribution rates of the two are almost equal. There are also positions where the influence of the reflected sound is greater at the sound receiving point higher than the wall. Therefore, it is understood that reducing the reflected sound is directly linked to the improvement of the performance of the soundproof wall.

Therefore, in order to minimize the reflected sound toward the sound receiving point, as shown in FIG. 1 (a), the sound source device S is focused, and as described in detail later (see FIG. 4), the noise is reduced. Anti
The cross-sectional shape of the surface to be projected is over the road surface side than the vertical direction
Consider a soundproof wall whose height is part of an ellipsoid so that it hangs . This sound barrier has the same height and overhang length as the prior art sound barrier described above. The results of these sound ray analysis, FIG 5 with the prior art
Shown in to FIG. 2 9. This analysis shows the reaching distance of the sound ray when the length of the sound ray is kept constant. 1 5, 1 9, 2 3, 2 8, and FIG. 2 9 As is clear, the total height is elliptical sound barrier of the present invention is extremely small attitude sound ray, sufficient attenuation It can be seen that after going through the effect, it is outside the wall. In the parabolic type of the prior art B, when the sound source device is located at the focal point, the sound is reflected by the wall and then travels in parallel to the vehicle running surface, so that the diffraction attenuation is lower than that in the case of the present proposal. Smaller. This is because the latter has a larger diffraction angle. FIG.
9, as is clear from FIG. 2 2 and 2 3 to 2 6,
It can also be seen that this shape is most advantageous when the sound source is out of focus of the ellipse. At this time, the aforementioned prior art B
According outermost sound source position, namely a parabolic shape to focus the same sound source position as FIG 2 3, of the proposed Fig. 1
A case where the height is the same as that of FIG. In this case, for example, the sound of the sound source position from the same position as FIG 9 is reflected one time each on the wall with running surface 20
It can be seen that are on the wall outside similarly to to 2 2. However, the shape of the proposed, despite the overhang portion is shorter than this, the sound corresponding to the arrow R of FIG. 2 7 is not present.

Therefore, if the height and the overhang length are the same, the reflected sound can be reduced over a wider range of sound source positions, and the cross-sectional shape of the noise reflecting surface of the present proposal is vertical.
It can be said that the shape that overhangs on the road surface side is better than the direction . Further, in the case of the parabolic type of the prior art B, when the sound source is located at the focal point, the sound is reflected by the wall and then travels in parallel to the vehicle running surface, so that the diffraction attenuation is lower than in the case of the present proposal. Become smaller. This is because the latter has a larger diffraction angle. In addition, FIG. 19 to FIG. 26
As can be seen, this shape is also most advantageous when the sound source is out of focus of the ellipse. Further, by moving the sound source device, a slight sound ray may be emitted in the case of the present proposal. However, as shown in FIG. 27, most of the sound ray which protrudes a reflected sound from the edge of the wall, this part (Q in FIG. 2 8, 2 9)
By performing sound absorption processing only on the sound source, it is possible to further reduce the reflected sound for a wider range of sound sources. The figure
As shown in FIG. 4 , the crossing of the noise reflecting surface according to the present invention
Shape overhangs on the road side rather than vertically
Soundproofing walls of the total height elliptical can be approximated by a large radius arc. That is, when the soundproof wall expressed by the equation (1) as an elliptic equation is approximated by the soundproof wall expressed by the equation (2), which is a circular equation, the coordinate values at the ends are as shown in Table 1. As is clear from these results, the difference between the coordinate values of the two shapes is 75 mm at point a and 79 mm at point b. The frequency that becomes a problem beyond noise barriers due to road noise is a relatively low frequency of about 100 Hz.
５００500 Hz and a wavelength of about 1700 mm to 740 mm. Therefore, the coordinate values shown in Table 1 are negligible. Therefore, there is no problem even if the ellipse is approximated by a circle. At the time of construction, a panel of a standard size can be smoothly dropped into the groove between the columns formed into an arc. The contact portions of the panels are in surface contact, and the manner of contact is equal to that of a straight wall.

[0008]

(Equation 1)

[0009]

[Table 1]

[0010] In the soundproof wall of the present invention as described above, every time the sound is repeatedly reflected inside, the reflected sound is collected to the lower part. since the intake sound material was placed on the road surface and the direction perpendicular lowers the wall surface inside the sound power level, it is possible to further reduce the propagation sound to result extramural (see FIG. 2).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a soundproof wall according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing one embodiment of the soundproof wall of the present invention. In the figure, reference numeral 1 denotes a noise barrier, which partitions a traffic noise source such as a road and a railroad, or a general noise source from a surrounding area, and is provided in a vertical direction. Reference numeral 2 denotes a vehicle traveling path, and the road may have a single traveling lane or a plurality of traveling lanes. 3
Is a plate-shaped overhang, and is provided on the upper back side of the soundproof wall 1 so that the plate surface direction of the overhang 2 is an elliptical focal direction. Symbol S is a sound source. FIG. 1A shows the soundproof wall 1.
A part of the ellipsoid whose focus is on the noise source side is a wall and a surface that reflects noise so that the noise source and the surrounding area are blocked.
Cross section overhangs on the road surface more than in the vertical direction
That sound barrier shape is one that was erected in opposition. The soundproof wall 1 having an elliptical curved surface according to the present invention has almost no difference in soundproofing effect even at a current practical scale even when approximated by an arc, and has a required arc length by stacking plate-shaped panels. In this case, the standard size panels can be dropped smoothly, so that the workability is improved, and the contact portions between the panels can be made almost the same as the straight walls. In addition, the soundproof wall 1 of FIG.
Is provided with a plate-shaped overhanging portion 3 on the upper back side so that the plate surface direction becomes an elliptical focal direction. The soundproof wall 1 of FIG. 1 (c) is provided with a plate-shaped overhanging portion 3 provided in the shape of a hook so that the plate surface is directed upward in the horizontal direction.

The optimal shape of the elliptical soundproof wall 1 is determined from the road width and the sound source position. At this time, there may be a case where the entire cross section sandwiched between the soundproof walls 1 cannot be formed as an ellipse due to a balance with the sound reduction effect. For example, if the overhang length is required to be as large as 5 m in order to obtain a greater sound reduction effect, an attempt to configure the entire cross section as an ellipse will result in a very distorted shape, and not necessarily the optimum cross sectional shape. Not limited. In such a case, the elliptical cross section is kept in an optimum shape, and the lacking portion of the overhanging portion is supplemented by horizontal overhanging. The soundproof wall 1 in FIG.
(B) and (c) are combined. The soundproof wall 1 of FIG. 1 (e) is provided with an overhang 3 so that the plate surface is horizontal and T-shaped at the top. Also, FIG. 2 (a) ~ (d) are schematic cross-sectional view showing another embodiment of the sound barrier of the present invention. In the figure, 4 is a sound absorbing material,
Install a sound absorbing part on a part of the road surface where the
This is an example of installation in a direction perpendicular to the plane . Next, a model is formed by using soundproof walls having the shapes shown in FIGS. 1A to 1E according to one embodiment of the present invention and FIGS. 3A to 3C according to a conventional example. The results of the experiment are shown in FIGS.
Note that the positional relationship between the sound source and the measurement position (coordinate point) is the same as in FIG. In FIGS. 30 3 7, the vertical axis sound pressure (scale range: -20dB~10dB), the horizontal axis is the frequency (scale range 1k HZ~12.5k HZ). As is apparent from these results, the present invention (FIGS. 1 (a) and 1 (b): symbols ▼ and Δ) is applied to sound receiving points (for example, coordinate points 45 and 33) where the influence of the reflected sound is large. The sound reduction effect of the elliptical soundproof wall is large. When the sound receiving point is below (for example, coordinate points 11 and 12), the second embodiment of the present invention (FIG. 1)
(B): It can be seen that the soundproof wall of the ellipse and the overhang, which is the symbol ◆), is much better than other shapes. This is because the influence of the diffracted sound is considerably large at the lower sound receiving point, and the result is that the diffraction attenuation is increased by the overhang.

Further, it is shown in FIGS. 38 45 An example of a result of the model experiment in the case of installing the intake sound material 4 on the median strip of the sound barrier installation road as shown in FIG. Note that the positional relationship between the sound source and the measurement position (coordinate point) is the same as in FIG. 38 to 45, the vertical axis represents the sound pressure (scale range:
-10dB to 20dB), the horizontal axis is frequency (scale range is 1
k HZ to 12.5 k HZ). A conventional inverted L-shaped type (the same type as that of FIG. 3B) is obtained by completely absorbing the sound on the sound source side (FIG. 38 to FIG. 41: symbol △, and FIGS. 42 to 45: symbol □) or the upper half. Sound absorption processing (FIGS. 38 to 4)
1: symbol □) and a sound-absorbing material corresponding to １ ／ of the height of the sound-insulating wall was installed in the median strip without the sound-absorbing treatment of the elliptical sound-insulating wall according to the present invention. d) (FIG. 3)
8 to FIG. 41: symbol）), or those of FIGS. 2A and 2B in which a sound absorbing material corresponding to 相当 height is installed (FIG. 42)
~ Figure 45: Symbol ○ and △) As is clear from the results of the comparison, the sound absorbing <br/> material corresponding to the ellipse + overhang +1/3 height (see FIG. 2 (d) type) (FIGS. 38 41: Symbol ○) is reverse L
Either character-shaped + whole-surface sound absorption processing (Fig. 38 to Fig. 41: symbol お よ び and Fig. 42 to Fig. 45: symbol □) or inverted L-shaped + upper half sound absorption processing (Fig. 38 to Fig. 41: symbol □) It is clear that the sound reduction effect is superior to that of the first embodiment. The sound absorbing material corresponding to the height of the ellipse + ま た は or the sound absorbing material corresponding to the ellipse + overhang +＋ １ height (FIGS. 42 to 45: symbols △ and Δ) are all inverted L-shaped + Overall sound absorption processing (FIGS. 38 to 41: symbol ：, and FIGS. 42 to 45:
It can be seen that the sound reduction effect is superior to that of the symbol □). That is, the soundproofing wall of the present invention can significantly reduce the sound absorbing processing area by installing a slight sound absorbing material in the middle of the soundproofing wall such as the median strip on the road. In addition, on highways, there are cases in which antiglare plates are provided in the median strip to prevent glare of oncoming vehicles at night. Thus, an acoustic effect can be obtained at the same time.

From the above results, it can be seen that the reflected sound is greatly reduced by the elliptical shape, and the overhanging portion greatly increases the diffraction attenuation effect. As is clear from the above, the following advantages are obtained. Among the sounds generated from the noise source, the reflected sound from the inner surface of the soundproof wall or the running surface is reduced. Even if the generated sound comes out of the sound insulation wall toward the sound receiving point, the sound is sufficiently attenuated due to sound absorption or distance attenuation since the multiple reflection is repeated. Can be extremely small. Diffraction sound from the upper end of the soundproof wall is reduced. The sound diffracted from the upper end portion goes to the back side (sound receiving point side) of the upper end portion and is attenuated by diffraction. Then, the diffraction is attenuated again at the overhang portion, so that the total diffraction attenuation can be increased. The reflected sound and the diffracted sound from the edge of the soundproof wall are reduced. Due to the shape having the curvature on the noise source side, most of the sound coming out of the wall is the sound reflected at the edge of the wall. Therefore, by performing sound absorption processing on only a small edge portion where the reflected sound that goes out of the wall is reflected, the reflected sound that goes out of the wall can be further reduced. However, in the case of a wall having no curvature, the reflected sound comes out from places other than the edge portion, so that unless the entire wall is subjected to sound absorption processing, it is impossible to prevent the reflected sound from jumping out of the wall. . From these results, when the height of the soundproof wall and the length of the overhang portion are made common, the soundproof wall having the elliptical characteristic according to the present invention is most effective in reducing the sound pressure level at the sound receiving point. is there.

[0015]

As described above, the sound insulating wall of the present invention has the effect of reducing the reflected sound and increasing the diffraction attenuation, and has a greater sound reducing effect as compared with the sound insulating wall having the same height and the same overhang length. This also allows the wall height to be lower than other sound barriers that seek the same sound reduction effect. Overhang length can be shortened. The sound absorbing process on the inner surface can be omitted. And so on, resulting in lower costs. The feeling of pressure on the driver is reduced. Further, since the curvature of the curved surface portion is large, the panel plate to be disposed may have a constant curvature. Therefore, when bending the H-shaped steel of the column, an existing machine such as a three-point roll bender can be used. The number and types of panels to be dropped can be reduced, so that the construction time can be shortened and the construction cost can be reduced. There is no gap between the contact portions of the panels, the appearance is improved, and cleaning becomes easier.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing a schematic shape of one embodiment of a soundproof wall of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a schematic shape of another embodiment of the soundproof wall of the present invention.

FIG. 3 is an explanatory cross-sectional view showing a schematic shape of a conventional soundproof wall.

FIG. 4 is an explanatory view of approximating an elliptical curved surface of a soundproof wall according to the present invention with a circular arc.

FIG. 5 is an explanatory diagram showing a relationship between a sound source device and a measurement position when performing a numerical simulation of a difference between a direct sound and a reflected sound.

FIG. 6 is a graph showing a result of performing a numerical simulation of a direct sound and a reflected sound at the coordinate points in FIG. 5 ;

FIG. 7 is a graph showing a result of performing a numerical simulation of a direct sound and a reflected sound at the coordinate points in FIG. 5 ;

8 is a graph showing the results of numerical simulation of the direct sound and reflected sound at the coordinate points in FIG.

9 is a graph showing a result of performing a numerical simulation of a direct sound and a reflected sound at the coordinate points in FIG. 5 ;

FIG. 10 is an explanatory diagram showing a relationship between a sound source device and a result of a numerical simulation when measuring a difference between a direct sound and a reflected sound.

11 is a graph showing a result of performing a numerical simulation of a direct sound and a reflected sound at the coordinate points in FIG. 10 ;

12 is a graph showing a result of performing a numerical simulation of a direct sound and a reflected sound at the coordinate points in FIG. 10 ;

13 is a graph showing the results of numerical simulation of the direct sound and reflected sound in the coordinate points of Figure 10.

FIG. 14 is a graph showing a result of performing a numerical simulation of a direct sound and a reflected sound at the coordinate points in FIG. 10 ;

FIG. 15 is an explanatory diagram showing a sound ray analysis result when the sound source position is 750 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 1A according to the present invention.

FIG. 16 is an explanatory diagram showing a sound ray analysis result in a case where the sound source position is 750 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG.

FIG. 17 is an explanatory diagram showing a sound ray analysis result when the sound source position is 750 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3B according to the conventional example.

FIG. 18 is an explanatory diagram showing a sound ray analysis result when the sound source position is 750 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3C according to the conventional example.

FIG. 19 is an explanatory view showing a sound ray analysis result when the sound source position is located at 527 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 1A according to the present invention.

FIG. 20 is an explanatory diagram showing a sound ray analysis result when a sound source position is located at 527 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG.

FIG. 21 is an explanatory diagram showing a sound ray analysis result when the sound source position is located at 527 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3B according to the conventional example.

FIG. 22 is an explanatory diagram showing a sound ray analysis result when the sound source position is 527 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3C according to the conventional example.

FIG. 23 is an explanatory diagram showing a sound ray analysis result when the sound source position is located 1101 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 1A according to the present invention.

FIG. 24 is an explanatory diagram showing a sound ray analysis result when a sound source position is located 1101 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3A according to the conventional example.

FIG. 25 is an explanatory diagram showing a sound ray analysis result when the sound source position is located 1101 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3B according to the conventional example.

FIG. 26 is an explanatory diagram showing a sound ray analysis result when the sound source position is located 1101 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 3C according to the conventional example.

FIG. 27 is an explanatory diagram showing a sound ray analysis result when a sound source position is located at 527 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall according to the conventional technology B.

FIG. 28 is an explanatory diagram showing a sound ray analysis result when the sound source position is located at 375 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 1A according to the present invention.

FIG. 29 is an explanatory diagram showing a sound ray analysis result when the sound source position is 1125 mm in the horizontal direction and 40 mm in the vertical direction from the soundproof wall in FIG. 1A according to the present invention.

FIG. 30 shows a model experiment using soundproof walls having the shapes shown in FIGS. 1 (a) and 1 (b) according to the present invention and FIGS. 3 (a) to 3 (c) according to a conventional example. 9 is a graph showing the results.

FIG. 31 shows a model experiment using soundproof walls having the shapes shown in FIGS. 1A and 1B according to the present invention and FIGS. 3A to 3C according to a conventional example. 9 is a graph showing the results.

FIG. 32 shows a model experiment using sound-insulating walls having the shapes shown in FIGS. 1 (a) and 1 (b) according to the present invention and FIGS. 3 (a) to 3 (c) according to a conventional example. 9 is a graph showing the results.

FIG. 33 shows a model experiment using soundproof walls having the shapes shown in FIGS. 1A and 1B according to the present invention and FIGS. 3A to 3C according to a conventional example. 9 is a graph showing the results.

FIG. 34 shows a model experiment performed using soundproof walls having the shapes shown in FIGS. 1A and 1B according to the present invention and FIGS. 3A to 3C according to a conventional example. 9 is a graph showing the results.

FIG. 35 shows a model experiment using soundproof walls having the shapes shown in FIGS. 1A and 1B according to the present invention and FIGS. 3A to 3C according to a conventional example. 9 is a graph showing the results.

FIG. 36 shows a model experiment performed using soundproof walls having the shapes shown in FIGS. 1A and 1B according to the present invention and FIGS. 3A to 3C according to a conventional example. 9 is a graph showing the results.

FIG. 37 shows a model experiment using soundproof walls having the shapes shown in FIGS. 1A and 1B according to the present invention and FIGS. 3A to 3C according to a conventional example. 9 is a graph showing the results.

FIG. 38 (b) shows a conventional sound-absorbing sound-absorbing surface in the sound source side or a sound-absorbing upper half in FIG. 3 (b). It is a graph which shows the result of having performed the model experiment using the thing of Drawing 2 (d) which installed the sound absorbing material equivalent to 1/3 height of the soundproof wall in a separation zone.

FIG. 39 shows a conventional sound-absorbing sound-absorbing wall or a sound-absorbing upper-half sound-absorbing wall according to the present invention. It is a graph which shows the result of having performed the model experiment using the thing of Drawing 2 (d) which installed the sound absorbing material equivalent to 1/3 height of the soundproof wall in a separation zone.

FIG. 40 shows a conventional sound-absorbing sound source in FIG. 3 (b), in which the sound source side has been entirely subjected to sound absorption processing, or an upper half in which sound absorption processing has been performed; It is a graph which shows the result of having performed the model experiment using the thing of Drawing 2 (d) which installed the sound absorbing material equivalent to 1/3 height of the soundproof wall in a separation zone.

FIG. 41 shows a conventional sound-absorbing sound source in which the sound source side has been entirely subjected to sound absorption processing in FIG. 3 (b) or an upper half thereof has been subjected to sound absorption processing; It is a graph which shows the result of having performed the model experiment using the thing of Drawing 2 (d) which installed the sound absorbing material equivalent to 1/3 height of the soundproof wall in a separation zone.

FIG. 42 shows the conventional sound-absorbing wall of FIG. 3 (b) and the elliptical sound-insulating wall according to the present invention. 2 (d) or 1/2 with a sound absorbing material corresponding to 高 height
It is a graph which shows the result of having performed a model experiment using what was shown in Drawing 2 (a) and (b) which installed a sound absorption material equivalent to height.

FIG. 43 shows the conventional sound-absorbing wall of FIG. 3 (b) and the sound-absorbing wall of the elliptical shape according to the present invention. 2 (d) or 1/2 with a sound absorbing material corresponding to 高 height
It is a graph which shows the result of having performed a model experiment using what was shown in Drawing 2 (a) and (b) which installed a sound absorption material equivalent to height.

FIG. 44 shows a conventional sound-absorbing sound-absorbing wall shape according to the present invention in which the sound source side in FIG. 2 (d) or 1/2 with a sound absorbing material corresponding to 高 height
It is a graph which shows the result of having performed a model experiment using what was shown in Drawing 2 (a) and (b) which installed a sound absorption material equivalent to height.

FIG. 45 shows the conventional sound-absorbing wall of the sound source side in FIG. 3 (b) and the elliptical sound-insulating wall shape according to the present invention, in which the wall is not subjected to the sound-absorbing processing and the height of the sound insulating wall is 1 2 (d) or 1/2 with a sound absorbing material corresponding to 高 height
It is a graph which shows the result of having performed a model experiment using what was shown in Drawing 2 (a) and (b) which installed a sound absorption material equivalent to height.

[Explanation of symbols]

 Reference Signs List 1 soundproof wall 2 overhang 3 road S sound source device

────────────────────────────────────────────────── (5) References JP-A-64-41609 (JP, A) JP-A-6-49508 (JP, U) JP-A-62-190715 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) E01F 8/00

Claims (5)

(57) [Claims] (1) Focusing on a noise source side so as to block a noise source and a surrounding area on a road or a railway line, and reducing noise.
The cross-sectional shape of the surface to be projected is over the road surface side than the vertical direction
A soundproof wall characterized by an elliptical wall standing upright so that it hangs . (2) Focusing on the noise source side so as to block a noise source and a surrounding area on a road or a railway line, and reducing noise.
The cross-sectional shape of the surface to be projected is over the road surface side than the vertical direction
A soundproof wall characterized in that an overhang is provided on the back side of an elliptical wall so as to hang . 3. The noise source side is focused on a road or a railway line so as to block the noise source and the surrounding area, and the noise is reduced.
The cross-sectional shape of the surface to be projected is over the road surface side than the vertical direction
Soundproof walls overall height to hang characterized in that a sound absorbing portion on a road surface in a direction perpendicular between the sound barrier erected opposite walls of the oval. 4. The noise source side is focused on the road or railway line so as to block the noise source and the surrounding area, and the noise is counteracted.
The cross-sectional shape of the surface to be projected is over the road surface side than the vertical direction
Overhang on the back side of the elliptical wall so that it hangs
A sound-insulating wall, wherein a sound-absorbing portion is provided between the provided sound-insulating walls in a direction perpendicular to the road surface . 5. A method according to claim 1, characterized in that subjected to sound absorption process to the edge of the sound barrier, 2, 3 or soundproofing wall according to any one of 4.