JP3828109B2 - Sound insulation wall using wood and charcoal - Google Patents

Description

  The present invention relates to a sound insulating wall that absorbs and blocks noise.

  Along the main roads in urban areas, noise caused by vehicle travel is significant, and the impact on the living environment is a problem. On such roads, restrictions on noise and vibration for each time zone are stipulated by environmental laws and regulations. However, there are not many roads that exceed these limits. Therefore, noise countermeasures along roads are urgently required.

  A typical example of noise countermeasures is the installation of sound insulation walls. Since the sound insulation wall is continuously installed along the road, it is an important element constituting the landscape of the road. As a result, in recent years, sound-insulating walls have been proposed in consideration of the scenery such as translucent plates and wooden sound-insulating walls, and there are cases where such sound-insulating walls are actually installed.

By the way, in the forestry aiming at the preservation of a healthy forest, thinned wood is generated in the process of forest management, but its effective use is required. In particular, in the field of civil engineering, it has been proposed to use thinned wood for earth retaining materials, park playground equipment, the above-mentioned wooden sound insulation walls, and the like.
JP 2002-351472 A

  As a wooden sound insulation wall using thinned wood, a structure in which a plurality of thinned wood having a carbonized layer formed on the surface is bound in a plate shape has been proposed (for example, see Patent Document 1). However, this wooden sound insulation wall cannot be easily manufactured because a carbonized layer must be formed on the surface of a plurality of thinned wood.

  Moreover, in such a wooden sound insulation wall, it has been pointed out that the sound absorption performance of the wood itself is low, and reduction of reflected sound has been a problem.

  An object of the present invention is to provide a sound insulating wall that has sufficient sound absorbing performance and sound insulating performance, can be easily manufactured, and can realize effective use of resources.

  In the sound insulation wall according to the first invention, a metal sound insulation plate is erected substantially vertically, a plurality of timbers are juxtaposed at a predetermined interval with respect to the sound insulation plate, and a net-like bag is filled with granular charcoal. The sound absorbing material is inserted between the sound insulating plate and the plurality of woods.

  In the sound insulating wall according to the first invention, noise is absorbed by the sound absorbing material made of granular charcoal and is blocked by the metal sound insulating plate. Thereby, sufficient sound absorption performance and sound insulation performance can be obtained. Moreover, since unnecessary timber can be used as a plurality of timbers, effective use of resources can be realized. Therefore, sufficient sound absorption performance and sound insulation performance are obtained, and effective use of resources is realized.

  Moreover, since it is not necessary to process carbonization etc. with respect to several timber, since ready-made granular charcoal can be used, manufacture is easy.

  Furthermore, since a plurality of timbers play the role of landscape materials, when used as public facilities such as roads, a good impression can be given to people, and a landscape with moisture and warmth peculiar to timber is realized. In addition, by using a plurality of wood and granular charcoal, the cost can be reduced compared to a metal sound insulation wall.

  In addition, since granular charcoal is used as the sound absorbing material, the effect of removing automobile exhaust gas (nitrogen dioxide) is obtained by the adsorption action of the granular charcoal, and the atmosphere is purified. Furthermore, since the removal effect of nitrogen dioxide by the adsorption action of granular charcoal has a persistence, the atmosphere can be purified over a long period of time.

  In the sound insulation wall according to the first aspect, the plurality of woods may be provided such that a gap is formed between them. In this case, noise is easily guided to the sound absorbing material through the gaps provided between the plurality of woods. As a result, the noise is absorbed by the sound absorbing material and blocked by the metal sound insulating plate.

  In the sound insulation wall according to the second invention, a metal sound insulation plate is erected substantially vertically, and a plurality of timbers are juxtaposed at a predetermined interval with respect to one surface of the sound insulation plate and to the other surface of the sound insulation plate. A plurality of timbers are juxtaposed at predetermined intervals, and a sound absorbing material formed by filling a net-like bag with granular charcoal is between one surface of the sound insulation plate and the plurality of woods, and the other surface of the sound insulation plate and the plurality of woods. Inserted between the two.

  In the sound insulation wall according to the second invention, a plurality of timbers are juxtaposed at a predetermined interval with respect to one surface of the sound insulation plate, and are arranged in parallel with a predetermined interval with respect to the other surface of the sound insulation plate. Since the sound absorbing material is inserted between the plate and the plurality of timbers, the noise generated from both sides around the sound insulating plate is absorbed by the sound absorbing material and blocked by the metal sound insulating plate.

  Thereby, even when it is installed in the central separation zone of the roadway, sufficient sound absorption performance and sound insulation performance can be obtained. Moreover, since unnecessary timber can be used as a plurality of timbers, effective use of resources can be realized. Therefore, sufficient sound absorption performance and sound insulation performance are obtained, and effective use of resources is realized.

  Moreover, since it is not necessary to process carbonization etc. with respect to several timber, since ready-made granular charcoal can be used, manufacture is easy.

  Furthermore, since a plurality of timbers play the role of landscape materials, when used as public facilities such as roads, a good impression can be given to people, and a landscape with moisture and warmth peculiar to timber is realized. In addition, by using a plurality of wood and granular charcoal, the cost can be reduced compared to a metal sound insulation wall.

  In addition, since granular charcoal is used as the sound absorbing material, the effect of removing automobile exhaust gas (nitrogen dioxide) is obtained by the adsorption action of the granular charcoal, and the atmosphere is purified. Furthermore, since the removal effect of nitrogen dioxide by the adsorption action of granular charcoal has a persistence, the atmosphere can be purified over a long period of time.

  In the sound insulating wall according to the second invention, the plurality of woods may be provided such that a gap is formed between them. In this case, noise is easily guided to the sound absorbing material through the gaps provided between the plurality of woods. As a result, the noise is absorbed by the sound absorbing material and blocked by the metal sound insulating plate.

  The plurality of timbers may be a plurality of thinned timbers. In this case, effective utilization of resources is realized because a plurality of timbers are a plurality of thinned wood. In addition, by using thinned wood, it is possible to nurture and preserve forests, to prevent landslides and floods, to recharge water sources and to suppress global warming.

  In addition, since thinned wood plays the role of landscape material, it can give a good impression to people when used as public facilities such as roads, and a woody moist and warm landscape is realized. Furthermore, cost reduction is realized by using thinned wood.

  An embankment having an inclined surface inclined obliquely downward from a lower portion of a plurality of timbers arranged side by side on the sound insulating plate may be provided. In this case, since the garbage thrown away from the vehicle toward the sound insulation wall returns to the own vehicle, the effect of psychologically suppressing the throwing away of the garbage from the vehicle is obtained.

  In the sound insulating wall according to the present invention, the noise is absorbed by the sound absorbing material made of granular charcoal and is blocked by the metal sound insulating plate. Thereby, sufficient sound absorption performance and sound insulation performance can be obtained. Moreover, since unnecessary timber can be used as a plurality of timbers, effective use of resources can be realized. Therefore, sufficient sound absorption performance and sound insulation performance are obtained, and effective use of resources is realized.

  Moreover, since it is not necessary to process carbonization etc. with respect to several timber, since ready-made granular charcoal can be used, manufacture is easy.

  Furthermore, since a plurality of timbers play the role of landscape materials, when used as public facilities such as roads, a good impression can be given to people, and a landscape with moisture and warmth peculiar to timber is realized. In addition, by using a plurality of wood and granular charcoal, the cost can be reduced compared to a metal sound insulation wall.

  In addition, since granular charcoal is used as the sound absorbing material, the effect of removing automobile exhaust gas (nitrogen dioxide) is obtained by the adsorption action of the granular charcoal, and the atmosphere is purified. Furthermore, since the removal effect of nitrogen dioxide by the adsorption action of granular charcoal has a persistence, the atmosphere can be purified over a long period of time.

  Hereinafter, a sound insulation wall according to an embodiment of the present invention will be described with reference to FIGS. The sound insulation wall according to the present embodiment is installed at, for example, a median of a roadway or a boundary between a sidewalk and a roadway (hereinafter abbreviated as a roadway boundary).

  FIG. 1 is a schematic diagram showing an example of a case where sound insulation walls according to an embodiment of the present invention are installed at a median strip and a pedestrian road boundary. According to FIG. 1, the sound insulation wall 100 according to the present embodiment is installed in the central separation zone, and the sound insulation wall 200 according to the present embodiment is installed at the pedestrian road boundary.

  In FIG. 1, sound insulation walls 100 and 200 absorb and block noise generated on roadways B and C. Thereby, noise leakage from the roads B and C to the sidewalks A and D is reduced.

  The structure of the sound insulation wall 100 in FIG. 1 will be described with reference to FIGS. 2 is a side view of the sound insulation wall 100 of FIG. 1, FIG. 3 is a cross-sectional view taken along line X1-X1 of FIG. 2, and FIG. 4 is a cross-sectional view taken along line Y1-Y1 of FIG.

  The sound insulation wall 100 in FIG. 1 has a symmetrical structure on the roadways B and C side as shown in FIGS. Therefore, the sound insulation wall 100 of FIG. 1 has the structure of FIG. 2 on both the roadways B and C side.

  As shown in FIG. 3, the concrete foundation 10 is erected so that a plurality of H-section steels 30 </ b> A and 30 </ b> B are embedded therein. Moreover, the embankment 20 is formed so that the both sides | surfaces of the concrete foundation 10 may be covered. The embankment 20 is formed to be inclined so as to gradually become lower from the concrete foundation 10 toward the roadways B and C. A curbstone 21 is provided outside the embankment 20.

  It is preferable that a plant is planted on the upper surface of the embankment 20. In this case, a good impression can be given to the person, and a landscape with moisture and warmth is realized.

  As shown in FIGS. 3 and 4, the plurality of H-section steels 30 </ b> A are erected at predetermined intervals in the longitudinal direction of the sound insulating wall 100. Here, the plurality of H-shaped steels 30 </ b> A are erected so that the flat surface is parallel to the longitudinal direction of the sound insulating wall 100.

  An end portion of the thinned material 31 having a predetermined length and a barb 32 are inserted into each concave surface of the plurality of H-shaped steels 30A. Here, the plurality of thinned lumbers 31 have a log shape, and the cutting tree 32 has a predetermined shape (for example, a rectangular parallelepiped shape) that can be inserted into the concave surface of the H-shaped steel 30A.

  Both ends of the plurality of thinned lumbers 31 are held by two H-section steels 30A provided with concave surfaces facing each other. A plurality of thinned lumbers 31 and cutting trees 32 are alternately inserted into the concave surface of the H-shaped steel 30A. Thereby, the predetermined clearance gap by the hitting tree 32 is formed between the some thinning materials 31. FIG. In this way, the plurality of gaps formed between the plurality of thinned materials 31 guides noise generated on the roads B and C to the sound absorbing material 50 and the sound insulating steel plate 40 described later.

  Here, in this Embodiment, the diameter of each thinning material 31 is about 80 mm, and the clearance gap between the several thinning materials 31 formed of the cutting tree 32 is about 40 mm. However, the diameter of the thinned material 31 and the size of the gaps between the plurality of thinned materials 31 formed by the cutting tree 32 are not limited to this.

  The sound insulating steel plate 40 is erected at the center on the concrete foundation 10. As shown in FIGS. 3 and 4, the sound insulating steel plate 40 is supported by the flat surfaces of the H-section steels 30A and 30B.

  The sound insulating steel plate 40 is, for example, a galvanized steel plate having a thickness of 2.3 mm, and has a characteristic of blocking noise generated on the roadways B and C.

  As shown in FIG. 3, the sound absorbing material 50 is inserted between the plurality of thinned materials 31 and the sound insulating steel plate 40. The sound absorbing material 50 is formed, for example, by filling a stainless steel wire mesh bag 51 with granular charcoal 52.

  The granular charcoal 52 has a porous structure and has a large surface area, and thus has a characteristic of absorbing sound. Therefore, the noise generated on the roads B and C is absorbed by the granular charcoal 52. Here, the thickness Q of the sound absorbing material 50 is, for example, 100 mm. The thickness Q of the sound absorbing material 50 is preferably 100 mm or more.

  A headboard 61 is provided on the upper end side of the plurality of H-shaped steels 30A. Screw holes are provided in advance at predetermined positions in the vicinity of the upper ends of the plurality of H-shaped steels 30 </ b> A and in the vicinity of the lower ends of the caps 61. The coping 61 is fixed on the H-shaped steel 30A by aligning the screw hole of the H-shaped steel 30A and the screw hole of the coping 61 and screwing the coping fixing screw 62.

  Thus, by providing the headboard 61 at the upper part of the sound insulating wall 100, the infiltration of moisture into the interior due to rain water or the like is reduced. Therefore, deterioration of the sound insulation wall 100 due to moisture is prevented, and a long life is realized.

  In the configuration of the sound insulation wall 100 described above, when the standing position of the H-section steel 30B is shifted from the H-section steel 30A, such as the H-section steel 30B standing on the roadway C side in FIG. Warpage and distortion of the material 31 and the sound insulating steel plate 40 are prevented.

  Further, the headboard 61 may be fixed to the upper end portion of the H-section steel 30A by installing a below-described trunk edge on the H-section steel 30A and through the trunk edge.

  The structure of the sound insulation wall 200 in FIG. 1 will be described with reference to FIGS. 5 is a side view of the sound insulation wall 200 of FIG. 1, FIG. 6 is a cross-sectional view taken along line X2-X2 of FIG. 5, and FIG. 7 is a cross-sectional view taken along line Y2-Y2 of FIG.

  As shown in FIG. 5, the sound insulation wall 200 of FIG. 1 has a different structure on the sidewalks A and D and the roadways B and C, and has a structure different from that of the sound insulation wall 100 in the following points.

  As shown in FIGS. 5, 6, and 7, a curbstone 21 is formed on the side surface of the sound insulation wall 200 on the side of the sidewalk A, D of the concrete foundation 10 so as to cover the concrete foundation 10. In addition, the embankment 20 is formed on the side surfaces of the concrete foundation 10 on the side of the roads B and C so as to cover the concrete foundation 10. The embankment 20 is formed to be inclined so as to gradually become lower from the concrete foundation 10 toward the roadways B and C. A curbstone 21 is provided outside the embankment 20.

  Similar to the sound insulation wall 100, a plant is preferably planted on the upper surface of the embankment 20. In this case, a good impression can be given to the person, and a landscape with moisture and warmth is realized.

  As shown in FIGS. 6 and 7, the plurality of H-section steels 30 </ b> A are erected at predetermined intervals in the longitudinal direction of the sound insulating wall 100. Here, the plurality of H-shaped steels 30 </ b> A are erected so that the flat surface is parallel to the longitudinal direction of the sound insulating wall 100.

  Similar to the structure of the sound insulation wall 100, the end portions of the thinning material 31 and the cutting trees 32 having a predetermined length are alternately arranged on the concave surfaces of the plurality of H-section steels 30A arranged on the roadways B and C side. Has been inserted.

  On the other hand, only the end of the thinned material 31 having a predetermined length is inserted into the concave surface of each of the plurality of H-section steels 30A arranged on the sidewalks A and D without inserting the cutting tree 32. Has been. Thereby, on the sidewalks A and D side of the sound insulating wall 200, the plurality of thinned lumbers 31 are held by the plurality of H-section steels 30A without gaps.

  Thereby, in the sound insulation wall 200 installed at the boundary of the roadway, the plurality of gaps formed between the plurality of thinned materials 31 on the roadways B and C side causes noise generated in the roadways B and C to be described later. And to the sound insulating steel plate 40.

  In addition, since no gap is formed between the plurality of thinning materials 31 on the sidewalks A and D, the side surfaces on the sidewalks A and D are covered with the plurality of thinning materials 31. As a result, a landscape with the moisture and warmth peculiar to wood is realized.

  As shown in FIG. 6, the sound insulating steel plate 40 of the sound insulating wall 200 is erected on the concrete foundation 10 adjacent to the plurality of H-section steels 30 </ b> A arranged on the sidewalks A and D. As shown in FIGS. 6 and 7, the sound insulating steel plate 40 is supported by flat surfaces of a plurality of H-section steels 30A and 30B. The sound absorbing material 50 of the sound insulating wall 200 is inserted between the plurality of thinned materials 31 on the roadways B and C side and the sound insulating steel plate 40.

  A headboard 61 is provided on the upper end side of the plurality of H-section steels 30 </ b> A in the same manner as the sound insulation wall 100.

  In the configuration of the sound insulation wall 200, when the standing position of the H-section steel 30B is shifted from the H-section steel 30A as in the H-section steel 30B of FIG. Etc. are prevented.

  The sound insulation walls 100 and 200 having the above-described structure are manufactured as follows, for example. Here, the manufacturing procedure of the sound insulation wall 100 of FIG. 1 will be described with reference to FIGS.

  8, FIG. 9 and FIG. 10 are schematic diagrams for explaining the manufacturing procedure of the sound insulating wall 100 of FIG.

  As shown in FIG. 8A, first, a concrete foundation 10 in which a plurality of H-section steels 30A, 30B are erected at predetermined positions is manufactured. And as shown in FIG.8 (b), the sound-insulating steel plate 40 is stood up so that several H-section steel 30B may support.

  Next, as shown in FIG.8 (c), the several thinning material 31 and the cutting tree 32 are alternately inserted in the concave surface of several H-section steel 30A. Thereafter, as shown in FIG. 9 (d), a wire mesh bag 51 is disposed between the sound insulating steel plate 40 and the plurality of thinned lumbers 31, and the metal mesh bag 51 is filled with granular charcoal 52. Thereby, the sound absorbing material 50 is formed.

  Subsequently, as shown in FIG. 9 (e), the trunk edge 30D is installed on the upper ends of the plurality of H-section steels 30A, and the headboard 61 is installed on the trunk edge 30D as shown in FIG. 9 (f).

  Finally, as shown in FIG. 10G, the embankment 20 is formed so as to cover both side surfaces of the concrete foundation 10, and the curb stone 21 is provided outside the embankment 20. Here, the embankment 20 may be formed with a soil improvement material, and lichens such as shiba may be planted.

  Although the production procedure of the sound insulation wall 100 in FIG. 1 has been described above, the production procedure of the sound insulation wall 200 in FIG. 1 is the same as described above.

  Next, the sound absorbing performance and sound insulating performance of the sound insulating walls 100 and 200 according to the present embodiment will be described.

  The present inventor conducted a sound absorption performance test based on “JIS (Japanese Industrial Standards) A 1409” in order to investigate the sound absorption performance of the sound insulating walls 100 and 200 manufactured as described above. In addition, this sound absorption performance test was performed by measuring the reverberation room method sound absorption rate for the sound insulation wall 100.

  The test results shown in FIG. 11 were obtained by the sound absorption performance test. FIG. 11 is a graph showing a test result of a sound absorption performance test of the sound insulating wall 100 according to the present embodiment. In FIG. 11, the vertical axis represents the sound absorption rate, and the horizontal axis represents the frequency. Note that the sound absorption performance test results indicated by black dots in the graph indicate the sound absorption rate at the center frequency of 1/3 octave band.

  As shown in FIG. 11, the sound insulation wall 100 exhibits a sound absorption rate of 78% with respect to a frequency of 400 Hz and a sound absorption rate of 71% with respect to a frequency of 1000 Hz. On the other hand, according to the “Sound Insulating Wall Design Guidelines (Japan Highway Public Corporation)”, as shown by the white circles in the graph, the ideal sound absorbing performance of the sound insulating wall is a sound absorption rate of 70% with respect to a frequency of 400 Hz and a frequency of 1000 Hz. On the other hand, a sound absorption rate of 80% is preferred.

  Therefore, it is clear that the sound insulation wall 100 according to the present embodiment has a sound absorption rate exceeding 70%, which is an ideal sound absorption rate, with a sound absorption performance with respect to noise having a frequency of 400 Hz. It became.

  In addition, it is clear that the sound insulation wall 100 according to the present embodiment has a sound absorption rate close to 80%, which is considered to be an ideal sound absorption rate, and has a sufficient sound absorption performance with respect to noise having a frequency of 1000 Hz. It became.

  Next, the present inventor conducted a sound insulation performance test based on “JIS A 1416” in order to investigate the sound insulation performance of the sound insulation walls 100 and 200 manufactured as described above. This sound insulation performance test was performed by measuring the sound transmission loss of the sound insulation wall 100.

  The test results shown in FIG. 12 were obtained by the sound insulation performance test. FIG. 12 is a graph showing the test results of the sound insulation performance test of the sound insulation wall 100 according to the present embodiment. In FIG. 12, the vertical axis represents sound transmission loss and the horizontal axis represents frequency. Note that the sound insulation performance test results indicated by black dots in the graph indicate sound transmission loss at the center frequency of 1/3 octave band.

  As shown in FIG. 12, the sound insulation wall 100 exhibits a sound transmission loss of 27.9 dB with respect to a frequency of 400 Hz and a sound transmission loss of 39.6 dB with respect to a frequency of 1000 Hz. On the other hand, according to the “Sound Insulation Wall Design Guidelines (Japan Highway Public Corporation)”, as shown by the white circles in the graph, the ideal sound insulation performance of the sound insulation wall is a sound transmission loss of 25 dB with respect to a frequency of 400 Hz and a frequency of 1000 Hz. On the other hand, a sound transmission loss of 30 dB is preferred.

  Therefore, it is clear that the sound insulation wall 100 according to the present embodiment has a sound transmission loss exceeding 25 dB, which is an ideal sound transmission loss, with a noise of 400 Hz, and has a sufficient sound insulation performance. It became.

  In addition, the sound insulation wall 100 according to the present embodiment exhibits a sound transmission loss exceeding 30 dB, which is considered to be an ideal sound transmission loss, even for noise with a frequency of 1000 Hz, and has sufficient sound insulation performance. It became clear.

Furthermore, the present inventor conducted the following nitrogen dioxide (NO ₂ ) purification performance test in order to investigate the influence of the granular charcoal 52 used for the sound insulation walls 100 and 200 on the atmosphere. FIG. 13 is a schematic diagram showing an outline of the NO ₂ purification performance test of the granular charcoal 52 used in the sound insulating walls 100 and 200 according to the present embodiment.

  As shown in FIG. 13, a U-shaped tube 500 is prepared. Here, branch pipes 501 and 502 are formed in the vicinity of both ends of the U-shaped pipe 500.

A predetermined amount of granular charcoal 52 is disposed in the prepared U-shaped tube 500, and rubber plugs 503 are fitted into both ends of the U-shaped tube 500. Then, a gas having a predetermined NO ₂ gas concentration from one of the branch pipes 501 and 502 is supplied, for measuring the NO ₂ gas concentration of the gas exhausted from the other.

As a result of the NO ₂ purification performance test, when the NO ₂ gas concentration of the exhausted gas is measured with respect to the gas supplied into the U-shaped tube 500, NO of about 96.7% to 99.6% is measured. ₂ Reduction of gas concentration was confirmed. Therefore, in the sound insulation walls 100 and 200, the atmosphere is purified by the granular charcoal 52 filled in the wire mesh bag 51.

In addition, as a result of performing the same NO ₂ purification performance test on the granular charcoal 52 disposed in the atmosphere on the roads B and C for about one month, almost the same test result was obtained. Therefore, it was confirmed that the granular charcoal 52 used for the sound insulating walls 100 and 200 has a function of purifying the atmosphere over a long period of time.

  As described above, in the sound insulating walls 100 and 200 according to the present embodiment, noise is absorbed by the sound absorbing material 50 including the granular charcoal 52 and the wire mesh bag 51 and is also blocked by the sound insulating steel plate 40. Thereby, sufficient sound absorption performance and sound insulation performance can be obtained. In addition, since a plurality of thinned lumbers 31 are used, effective use of resources can be realized. Therefore, sufficient sound absorption performance and sound insulation performance are obtained, and effective use of resources is realized.

  In particular, in the sound insulation wall 200, a plurality of thinned materials 31 are juxtaposed at a predetermined interval with respect to one surface of the sound insulation steel plate 40, and are arranged in parallel at a predetermined interval with respect to the other surface of the sound insulation steel plate 40, Since the sound absorbing material 50 is inserted between the sound insulating steel plate 40 and the plurality of thinned lumbers 31, noise generated from both sides around the sound insulating steel plate 40 is absorbed by the sound absorbing material 50 and blocked by the sound insulating steel plate 40. Is done. Therefore, even when installed in the central separation zone of the roadway, sufficient sound absorption performance and sound insulation performance can be obtained.

  In addition, a plurality of thinned lumbers 31 may be subjected to general round bar processing, drying processing, antiseptic processing, and the like at the time of production, but it is not necessary to perform special processing such as carbonization processing. And the ready-made granular charcoal 52 can be used for the sound-absorbing material 50. Therefore, manufacture is easy.

  Furthermore, since the plurality of thinned lumber 31 plays a role as a landscape material, when used as a public facility such as a road, a good impression can be given to a person, and a landscape with moisture and warmth peculiar to wood is realized. Further, by using a plurality of thinned lumbers 31 and granular charcoal 52, the cost can be reduced compared to a metal sound insulating wall.

  In addition, since the granular charcoal 52 is used for the sound absorbing material 50, the adsorption effect of the granular charcoal 52 provides an effect of removing nitrogen dioxide, that is, the exhaust gas of the automobile, and the air is purified. Furthermore, since the removal effect of nitrogen dioxide by the adsorption action of the granular charcoal 52 is persistent, the air can be purified over a long period of time.

  Further, since a plurality of thinning materials 31 are used for the sound insulating walls 100 and 200, effective use of resources is realized. In addition, by utilizing the thinned wood 31, it is possible to grow and maintain forests, suppress landslide disasters and flood damage, recharge water sources, and suppress global warming.

  Furthermore, since the thinned wood 31 serves as a landscape material, when used as a public facility such as a road, a good impression can be given to a person, and a landscape with moisture and warmth peculiar to wood is realized. Moreover, cost reduction is realized by using thinned wood.

  In addition, the sound insulating walls 100 and 200 are provided with the embankment 20 having an inclined surface that is inclined obliquely downward from the lower portion of the plurality of thinned lumbers 31 provided in parallel to the sound insulating steel plate 40. As a result, on the roads B and C, since the garbage thrown away from the vehicle toward the sound insulation walls 100 and 200 returns to the own vehicle, the effect of psychologically suppressing the throwing away of the garbage from the vehicle. Is obtained.

  In the present embodiment, the sound insulation walls 100 and 200 correspond to sound insulation walls, the sound insulation steel plate 40 corresponds to a metal sound insulation plate, the plurality of thinned materials 31 correspond to a plurality of wood, and the wire mesh bag 51 serves as a mesh bag. The granular charcoal 52 corresponds to the granular charcoal, the sound absorbing material 50 corresponds to the sound absorbing material, and the embankment 20 corresponds to the embankment.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for noise countermeasures and the like by being installed in a median strip of a roadway, a boundary between a sidewalk and a roadway, a railway line, and the like.

It is a schematic diagram which shows an example at the time of installing the sound insulation wall which concerns on one embodiment of this invention in a median strip and a pedestrian road boundary. It is a side view of the sound insulation wall 100 of FIG. FIG. 3 is a cross-sectional view taken along line X1-X1 of FIG. FIG. 3 is a cross-sectional view taken along line Y1-Y1 of FIG. It is a side view of the sound insulation wall 200 of FIG. FIG. 6 is a cross-sectional view taken along line X2-X2 of FIG. FIG. 6 is a sectional view taken along line Y2-Y2 of FIG. It is a schematic diagram for demonstrating the manufacture procedure of the sound insulation wall of FIG. It is a schematic diagram for demonstrating the manufacture procedure of the sound insulation wall of FIG. It is a schematic diagram for demonstrating the manufacture procedure of the sound insulation wall of FIG. It is a graph which shows the test result of the sound insulation wall sound absorption performance test which concerns on one embodiment of this invention. It is a graph which shows the test result of the sound insulation performance test of the sound insulation wall which concerns on one embodiment of this invention. It is a schematic diagram showing an outline of NO ₂ purification performance test of granular charcoal for use in a sound insulation wall according to an embodiment of the present invention.

Explanation of symbols

20 Embankment 31 Thinned wood 40 Sound insulation steel plate 50 Sound absorption material 51 Wire mesh bag 52 Granular charcoal 100,200 Sound insulation wall

Claims (4)

A sound insulating material made of metal is erected substantially vertically, a plurality of timbers are juxtaposed at a predetermined interval with respect to the sound insulating plate, and a sound absorbing material in which a granular bag is filled with granular charcoal is the sound insulating plate and A sound insulation wall inserted between the plurality of timbers. A metal sound insulating plate is erected substantially vertically, and a plurality of woods are juxtaposed at a predetermined interval with respect to one surface of the sound insulating plate and at a predetermined interval with respect to the other surface of the sound insulating plate. Are arranged in parallel, and a sound absorbing material in which a net-like bag is filled with granular charcoal is between one surface of the sound insulation plate and the plurality of wood, and between the other surface of the sound insulation plate and the plurality of wood. Sound insulation walls characterized by being inserted respectively. The sound insulation wall according to claim 1, wherein the plurality of timbers are a plurality of thinned timbers. The sound insulation wall according to any one of claims 1 to 3, further comprising an embankment having an inclined surface inclined obliquely downward from a lower portion of the plurality of timbers arranged side by side on the sound insulation plate.

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