JP7689468B2 - Noise reduction structure - Google Patents

Description

The present invention relates to a noise reduction structure.

The following Patent Document 1 describes a sound-insulating balcony structure that has a reflective surface on the balcony ceiling that reflects incident noise sound waves. In this sound-insulating balcony structure, the inclination angle of the reflective surface relative to the propagation direction of the direct noise waves is set to 90 degrees or more, thereby reducing noise that enters the window openings of the building.

JP 2012-211509 A

The soundproof balcony structure of Patent Document 1 reflects noise to the outside of the building. Therefore, even if it is possible to reduce noise inside the building, it is difficult to reduce noise outside the building. This means that the reflected noise may affect other buildings.

Taking the above facts into consideration, the present invention aims to provide a noise reduction structure that can reduce noise both inside and outside a building.

The noise reduction structure of claim 1 is provided on at least one of a ceiling surface and a side wall surface of a balcony of a building, and includes a sound absorbing mechanism that absorbs noise incident from the outside, the sound absorbing mechanism including a reflecting section that reflects the noise on the ceiling surface by sloping from the bottom to the top from the inside to the outside in the depth direction of the balcony, or that reflects the noise on the side wall surface by sloping from the inside to the outside in the length direction of the balcony from the inside to the outside from the inside to the inside in the depth direction of the balcony, and a sound absorbing section that absorbs the reflected sound reflected by the reflecting section;
The reflecting portion is formed on each of the plurality of blades .

In the noise reduction structure of claim 1, a sound absorbing mechanism that absorbs noise is provided on at least one of the ceiling surface and side wall surface of the balcony. This sound absorbing mechanism includes a reflecting section that reflects noise at an angle to the ceiling surface or the side wall surface so as to expand from the window surface toward the end of the balcony, and a sound absorbing section that absorbs the reflected sound reflected by the reflecting section.

In other words, if the sound-absorbing mechanism is placed on the balcony ceiling, it will reflect noise from below and further absorb it. Also, if the sound-absorbing mechanism is placed on the balcony side wall, it will reflect noise from the side and further absorb it. This will reduce noise both inside and outside the building compared to a structure where, for example, the balcony ceiling is only provided with a reflecting part and no sound-absorbing part.

The reflective portion of the sound-absorbing mechanism is inclined relative to the ceiling or side wall surface so that it spreads from the window surface toward the end of the balcony. This makes it easier to reduce noise from the front of the balcony compared to a configuration in which the reflective portion is parallel to the ceiling or side wall surface. It also makes it less likely to obstruct the view from inside the room, and less likely to obstruct the entry of light into the room.

The noise reduction structure of claim 2 is the noise reduction structure described in claim 1, wherein the sound absorbing mechanism is provided with louvers formed by a plurality of slats on the ceiling surface that incline from the bottom to the top from the inside to the outside in the depth direction of the balcony, or formed by a plurality of slats on the side wall surface that incline from the inside to the outside in the depth direction of the balcony , and the sound absorbing section is arranged on the back side of the slats or on the ceiling surface or side wall surface on which the sound absorbing mechanism is provided.

In the noise reduction structure of claim 2, the reflecting portion is formed on each of the multiple blades. In other words, the reflecting portion is formed in separate parts.

For this reason, if each slat is arranged "in a tilted state" with respect to the ceiling or side wall surface, even if the slats are arranged "parallel to each other" with respect to the ceiling or side wall surface, a reflective section can be formed that is tilted so that it spreads from the window surface toward the end of the balcony. In this case, the sound absorbing mechanism can be made more space-saving than when the slats are arranged "diagonally" with respect to the ceiling or side wall surface.

Alternatively, if the sound-absorbing mechanism is located on the balcony ceiling, by staggering the height of each slat, it is possible to form a reflective area that is inclined so that it spreads from the window surface toward the end of the balcony, regardless of whether each slat is inclined or not.

In addition, if the sound-absorbing mechanism is located on the side wall of the balcony, by staggering the horizontal positions of each slat, it is possible to form a reflective area that is inclined so that it spreads from the window surface toward the end of the balcony, regardless of whether each slat is inclined or not.

The noise reduction structure of claim 3 is the noise reduction structure described in claim 1, wherein the sound absorbing mechanism is provided with louvers formed by a plurality of the slats arranged on the ceiling surface at positions shifted from bottom to top from the inside to the outside in the depth direction of the balcony , and the sound absorbing section is arranged inside the ceiling, closer to the inside in the depth direction of the balcony than the louvers.

In the noise reduction mechanism of claim 3, the reflecting parts are formed on each of the multiple slats. That is, the reflecting parts are formed in separate parts. These reflecting parts are arranged at an angle from the window surface toward the end of the balcony by being staggered so as to spread out from the window surface toward the end of the balcony.

And because the sound absorbing section is located inside the ceiling, closer to the window than the louvers, it is less exposed to wind and rain. This means that the sound absorbing performance is less likely to deteriorate.

The noise reduction structure of claim 4 is the noise reduction structure of any one of claims 1 to 3, in which the sound absorbing mechanism is provided on both the ceiling surface and the side wall surface.

In the noise reduction structure of claim 4, the sound absorbing mechanism is provided on both the ceiling surface and the side wall surface, so that it can absorb noise incident from below and the sides, compared to when it is provided on only one of them. This improves the sound absorbing performance.

The noise reduction structure of claim 5 is the noise reduction structure of any one of claims 1 to 4, in which the sound absorbing portion is formed from at least one of punching metal and porous material.

In the noise reduction structure of claim 5, the sound absorbing portion is formed from at least one of punched metal and porous material. Therefore, even if the sound absorbing portion is exposed to wind and rain, rainwater is less likely to accumulate and is easily drained, so it is less likely to deteriorate.

This invention can reduce noise both inside and outside a building.

1A is a side cross-sectional view showing a noise reduction structure in which a sound absorbing mechanism is formed on a ceiling surface, and FIG. 1B is a cross-sectional view taken along line BB in FIG. (A) is a cross-sectional view of a blade showing an example of using punched metal as the sound-absorbing part, (B) is a cross-sectional view of a blade showing an example of using porous material as the sound-absorbing mechanism, and (C) is a cross-sectional view of a blade showing an example of using punched metal and porous material as the sound-absorbing mechanism. 1A is a side cross-sectional view showing a noise reduction structure having a sound absorbing mechanism formed on a side wall surface, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A is a side cross-sectional view showing a noise reduction structure in which sound absorbing mechanisms are formed on a ceiling surface and a side wall surface, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 13 is a side cross-sectional view showing a modified example in which a sound absorbing portion is formed on the ceiling surface. FIG. 1A is a side cross-sectional view showing a modified example in which a sound absorbing portion is formed on the ceiling surface and the blades are curved, and FIG. 1B is an enlarged view of the blades. FIG. 11 is a side cross-sectional view showing a modified example of the arrangement of the blades. 11A to 11C are side cross-sectional views showing modified examples of the arrangement of the slats and the arrangement of the sound absorbing parts. 13 is a side cross-sectional view showing another modified example of the arrangement of the slats and the arrangement of the sound absorbing parts. FIG.

The noise reduction structure according to the embodiment of the present invention will be described below with reference to the drawings. Components indicated with the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and there may be multiple components.

In addition, explanations of configurations and symbols that are duplicated in each drawing may be omitted. Note that the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications, such as omitting configurations or replacing them with different configurations, within the scope of the purpose of the present invention.

In each figure, the directions indicated by the arrows X and Y are directions along a horizontal plane and are perpendicular to each other. The direction indicated by the arrow Z is a direction along the vertical direction (up and down direction). In each figure, the directions indicated by the arrows X, Y, and Z are assumed to be consistent with each other.

<Noise reduction structure>
1(A) and (B) show an example of a noise reduction structure 20 according to an embodiment of the present invention. The noise reduction structure 20 is a noise suppression means that is applied to a building 10 and aims to suppress noise both inside and outside the building 10.

The noise reduction structure 20 includes a sound absorbing mechanism provided on at least one of the ceiling surface and the side wall surface of the balcony 12 of the building 10. In this specification, the sound absorbing mechanism provided on the ceiling surface of the balcony 12 is referred to as sound absorbing mechanism 20A, and the sound absorbing mechanism provided on the side wall surface of the balcony 12 is referred to as sound absorbing mechanism 20B.

Detailed embodiments will be described later, but the noise reduction structure 20 may be formed by only the sound absorbing mechanism 20A (see FIG. 1), or may be formed by only the sound absorbing mechanism 20B (see FIG. 3). The noise reduction structure 20 may also be formed by both the sound absorbing mechanisms 20A and 20B (see FIG. 4).

(building)
Although the use of the building 10 is not particularly limited, the building 10 in this embodiment is an apartment building. The noise reduction structure 20 is applied to the balcony 12 of the building 10.

A main road (not shown, such as a national expressway, a general national road, or a prefectural road) runs in front of the balcony 12 of the building 10. The longitudinal direction (X direction) of the balcony 12 is aligned with the direction of the lanes on the main road. Note that various roads other than the main road, train tracks, etc. may also run in front of the building 10.

The balcony 12 is an outdoor space separated from the indoor space R of the building 10 by a glass window 14. The glass window 14 is a sliding window for entering and exiting the balcony 12 from the indoor space R, and is arranged along the longitudinal direction of the balcony 12. A slab 16 is formed on the outside of the glass window 14.

The slab 16 is a cantilevered slab that juts out from the building 10, and is provided on each floor of the building 10, forming the floor surface of the balcony 12 on each floor. A handrail 16A is provided at the end of the slab 16. Note that, to simplify the illustration, the handrail 16A is omitted in FIG. 1(B). The same applies to the other floor plans.

<Examples of sound absorbing mechanisms>
(Sound absorbing mechanism installed on the ceiling surface)
1 shows a noise reduction structure 20 formed only by a sound absorbing mechanism 20A. The sound absorbing mechanism 20A provided on the ceiling surface is formed by a louver 30A, for example. The "ceiling surface" refers to the vicinity of the slab 16 above the balcony 12 (a position closer to the upper slab than the lower slab).

The louver 30A is formed by a number of slats 32. The slats 32 are long, flat members arranged so that their longitudinal direction coincides with the longitudinal direction (X direction) of the balcony 12. As shown in FIG. 1(B), the slats 32 are arranged between the partition plates 18 arranged on both sides of the balcony 12 in the X direction.

As shown in FIG. 1(A), the slats 32 are arranged on the ceiling surface at an angle so that they extend from the window surface of the glass window 14 toward the tip of the balcony 12.

Here, "from the window surface of the glass window 14 toward the tip of the balcony 12" refers to going from the inside to the outside in the depth direction (Y direction) of the balcony 12. "Arranged at an incline so as to expand" refers to being arranged at an incline from the bottom to the top in the vertical direction (Z direction) of the balcony 12.

In this embodiment, the lower end of the slats 32 is positioned inside the balcony 12 in the depth direction, and the upper end is tilted so that it is positioned outside the balcony 12 in the depth direction.

The blades 32 are arranged in a line in the vertical direction (Z direction) with each blade inclined in this manner. In FIG. 1(A), three blades 32 are shown, but the number of blades 32 is not particularly limited as long as it is two or more.

The slat 32 has a reflecting portion 32A and a sound absorbing portion 32B. The reflecting portion 32A is formed on the front side of the slat 32 (the surface facing the road below), and the sound absorbing portion 32B is formed on the back side of the slat 32 (the surface facing the slab 16 above).

As shown by the arrow N1 in FIG. 1(A), sound entering the louver 30A from below is partially reflected by the reflecting portion 32A of the slats 32, and a portion of the reflected sound is further absorbed by entering the sound absorbing portion 32B.

Reflector 32A shown in FIG. 2(A) is, for example, made of a heavy material such as a metal material such as aluminum or stainless steel, and forms a smooth and hard surface. From the viewpoint of drainage, it is preferable to provide drainage holes (not shown) at predetermined positions on reflector 32A.

On the other hand, the sound absorbing section 32B is formed, for example, from a punched metal 50. The punched metal 50 is a steel or aluminum plate material in which a plurality of through holes 52 are formed at predetermined intervals in the in-plane direction. The punched metal 50 is fixed to the reflecting section 32A using an appropriate fixing means such as a bolt or adhesive.

In addition, the sound absorbing section 32B in the present invention may be a porous material 54 as shown in FIG. 2(B). For example, foamed polypropylene having voids may be used as the porous material 54. In addition, urethane may be used as the porous material 54.

In addition, as shown in FIG. 2(C), the sound absorbing section 32B of the present invention can be made by combining a punched metal 50 and a porous material 54. By forming the sound absorbing section 32B from at least one of the punched metal 50 and the porous material 54 in this way, the sound absorbing section 32B is less likely to deteriorate even when exposed to wind and rain, because rainwater is less likely to accumulate and is easily drained.

The "sound absorbing" performance of the sound absorbing mechanism of the present invention refers to the ability to absorb (deaden) at least a portion of the incident sound. Incident sound that is not absorbed may be reflected to the outside.

To achieve this sound absorbing performance, the sound absorbing mechanism is provided with holes (through holes 52 in the punched metal 50 or air bubbles in the porous material 54) to absorb incident sound.

(Sound absorbing mechanism provided on the side wall surface)
3 shows a noise reduction structure 20 formed only by a sound absorbing mechanism 20B. The sound absorbing mechanism 20B provided on the side wall surface is formed by a louver 30B, for example. The "side wall surface" refers to the vicinity of the partition plate 18 that separates the veranda 12 between adjacent dwelling units (the portion within approximately 50 cm from the partition plate).

Louver 30B is formed by slats 32 similar to those of louver 30A that are provided in a sound-absorbing mechanism installed on the ceiling surface. In louver 30B, slats 32 are arranged so that their longitudinal direction coincides with the vertical direction (Z direction) of the balcony 12. In addition, slats 32 are arranged between the upper and lower slabs 16.

The slats 32 are arranged on the side wall at an angle so that they extend from the window surface of the glass window 14 toward the tip of the balcony 12.

Here, "from the window surface of the glass window 14 toward the end of the balcony 12" refers to, as above, from the inside to the outside in the depth direction (Y direction) of the balcony 12. "Arranged at an incline so as to expand" refers to a state in which the balcony 12 is arranged at an incline from the inside (toward the center of the balcony 12) to the outside (toward the partition plate 18) in the longitudinal direction (X direction) of the balcony 12.

In this embodiment, the inner end of the slats 32 is positioned inside the balcony 12 in the depth direction, and the outer end is tilted so that it is positioned outside the balcony 12 in the depth direction.

The slats 32 are arranged in a line along the depth direction (Y direction) of the balcony 12 in this inclined state. In Figures 3(A) and (B), three slats 32 are shown, but the number of slats 32 is not particularly limited as long as it is two or more.

As shown by arrow N2 in FIG. 3B, sound incident on the louver 30B from the side is partially reflected by the reflecting portion 32A of the slats 32, and a portion of the reflected sound is further absorbed by the sound absorbing portion 32B.

Note that FIG. 3(B) shows an example in which louvers 30B are placed on both sides of the balcony 12, in other words, in two locations on both sides for each dwelling unit, but the embodiment of the present invention is not limited to this. For example, louvers 30B may be placed on only one side of the balcony 12. Also, louvers 30B do not need to be provided on the entire surface of the partition board 18, for example to ensure an evacuation route.

(Sound absorbing mechanism provided on the ceiling and side walls)
4A and 4B show an example in which a louver 30A in a sound absorbing mechanism 20A is combined with a louver 30B in a sound absorbing mechanism 20B. The respective configurations are as described above, and detailed explanations will be omitted.

In this embodiment, the sound absorbing mechanism is provided on both the ceiling surface and the side wall surface, so noise entering the balcony 12 from below and the sides can be absorbed, compared to when it is provided on only one of them. This improves the sound absorbing performance.

<Examples of sound absorbing mechanisms>
The following describes examples of the sound absorbing mechanism. Note that, although each example is described as a sound absorbing mechanism 20A provided on a ceiling surface, these examples can also be used in a similar configuration as a sound absorbing mechanism 20B provided on a side wall surface.

(Example of sound absorbing part placement)
As shown in Figures 1 and 3, the sound absorbing portion 32B in the above embodiment is formed on the back surface of the blades 32 that constitute the louvers 30A and 30B, but the embodiment of the present invention is not limited to this. For example, like the sound absorbing portion 34B shown in Figure 5, the sound absorbing portion may be provided on the ceiling surface (the lower surface of the slab 16 in this embodiment).

The sound absorbing section 34B is arranged to cover at least a portion of the underside of the slab 16, and like the sound absorbing section 32B, it can be formed from a punched metal 50, a porous material 54, or a composite material of a punched metal 50 and a porous material 54 (see Figure 2).

When the sound absorbing section is provided on the ceiling surface in this manner, the front and back surfaces of each of the blades 34A that form the louvers 34 each constitute a reflecting section. The blades 34A are made of the same material as the reflecting section 32A (see Figure 2).

The slats 34A may be arranged in a row along the vertical direction (Z direction) like the slats 32 (see FIG. 1), but may also be arranged in a row along the depth direction (Y direction) of the balcony 12, as in the example shown in FIG. 5.

In this configuration, with the slats 34A as the reflecting parts and the sound absorbing parts 34B on the underside of the slab 16, as shown by the arrow N3, the incident sound that enters the louvers 34 from below is reflected by the slats 34A as the reflecting parts, and some of the reflected sound is further reflected multiple times before entering the sound absorbing parts 32B and being absorbed.

The slats that are the reflecting parts may be curved so as to be convex toward the outdoor side of the balcony 12, as shown by slats 34C in FIG. 6(A). By forming the slats in this way, incident sound that enters the louvers 34 from below is more likely to be reflected upward, as shown by arrows N4 in FIG. 6(A) and (B). This makes it easier for the reflected sound to enter the sound absorbing part 34B shown in FIG. 6(A).

In addition, in FIG. 6(B), arrow N5 shows an example of the direction in which sound incident on blade 34A is reflected when uncurved blade 34A is positioned with its bottom end at the same height as curved blade 34C. Comparing arrows N5 and N4, arrow N4 is inclined upward. In other words, it is easier for the reflected sound to be incident on sound absorbing section 34B.

(Example 1 of the arrangement of slats in a louver)
As shown in Fig. 1A, the blades 32 of the louver 30A are inclined so that the lower end is disposed on the glass window 14 side (inside in the Y direction) and the upper end is disposed on the outdoor side (outside in the Y direction). The same applies to the blades 34A shown in Fig. 5 and the blades 34C shown in Fig. 6. However, the embodiment of the present invention is not limited to this.

For example, as shown in FIG. 7, the louvers 36A, 36B, and 36C may be arranged at an angle by positioning the lower end on the outdoor side (outside in the Y direction) and the upper end on the glass window 14 side (inside in the Y direction). In this case, however, the lower end of the louver arranged on the outdoor side is positioned higher than the lower end of the louver arranged on the glass window 14 side.

In the example shown in FIG. 7, blade 36A is positioned closer to the outside than blade 36B, which is positioned closer to the outside than blade 36C. The lower end of blade 36A is positioned higher than the lower end of blade 36B, and the lower end of blade 36B is positioned higher than the lower end of blade 36C.

In this way, "multiple slats inclined to spread from the window surface toward the end of the balcony" in this invention includes configurations in which each "single slat" is inclined to spread from the window surface toward the end of the balcony, such as slat 32 shown in Figure 1 (A), slat 34A shown in Figure 5, and slat 34C shown in Figure 6. It also includes configurations in which "multiple slats" are arranged at an angle to spread from the window surface toward the end of the balcony, such as slats 36A, 36B, and 36C shown in Figure 7.

The blades 36A, 36B, and 36C are formed as reflecting sections, and as shown by arrows N6 and N7, sound that enters the louver 36 from below is reflected by at least one of the blades 36A, 36B, and 36C, and a portion of the reflected sound is further incident on the sound-absorbing section 34B on the ceiling surface and absorbed.

(Example 2 of the arrangement of slats in a louver)
The embodiment described with reference to FIG. 7 in which "multiple slats" are arranged at an angle so as to widen from the window surface toward the end of the balcony can also be formed as in the louver 38 shown in FIG.

The louvers 38 are formed by multiple horizontally arranged blades 38A. The blades 38A are arranged at staggered positions so that they spread from the window surface of the glass window 14 (the inner side of the balcony 12 in the depth direction) toward the tip of the balcony 12 (the outer side of the balcony 12 in the depth direction). Specifically, the blades 38A arranged on the outer side of the balcony 12 in the depth direction are arranged higher on the balcony 12 than the blades 38A arranged on the inner side.

The blades 38A of the louvers 38 are formed as reflecting parts, and the sound absorbing parts 40 are placed inside the ceiling closer to the glass window 14 than the louvers 38. "Inside the ceiling" refers to the space between the slab 16 and the eaves board 42, which is located below the slab 16 and above the glass window 14.

The sound absorbing section 40 is formed using the same material as the sound absorbing sections 32B and 34B described above, and is installed on the upper surface of the eaves board 42. Note that the sound absorbing section 40 may also be installed on the underside of the slab 16, for example, inside the ceiling, as shown by the dashed line 40A in FIG. 8.

In addition, as shown in FIG. 9, the eaves top board 42 may be provided with a through hole 42A that penetrates between the inside and outside of the ceiling. By providing the through hole 42A in the eaves top board 42, it is possible to prevent rainwater and moisture from accumulating inside the ceiling.

In addition, regardless of the presence or absence of through holes 42A, sound absorbing section 40 may be composed of multiple sound absorbing members 40B. Sound absorbing members 40B are formed into a plate shape using the same material as sound absorbing sections 32B and 34B described above, and are arranged so that the in-plane direction is aligned with the vertical direction (Z direction) and the longitudinal direction (X direction) of balcony 12.

As shown by arrow N8, sound entering the louver 38 from below is reflected by at least one of the blades 38A, and a portion of the reflected sound enters the sound absorbing section 40 and is absorbed.

As shown in Figures 8 and 9, by locating the sound absorbing section 40 inside the ceiling closer to the glass window 14 than the louvers 38, the sound absorbing section 40 is less likely to be exposed to wind and rain. This makes it less likely for the sound absorbing performance to deteriorate.

<Action and Effects>
1, 3 and 4, in the noise reduction structure according to the embodiment of the present invention, a sound absorbing mechanism (sound absorbing mechanisms 20A, 20B, or both 20A and 20B) that absorbs noise is provided on at least one of the ceiling surface and the side wall surface of the balcony 12. This sound absorbing mechanism includes a reflecting section (reflecting section 32A, slats 34A, 34C, 36A, 36B, 36C or 38A) that reflects noise at an angle so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12, and a sound absorbing section (sound absorbing section 32B, 34B, 40) that absorbs the sound reflected by the reflecting section.

That is, as shown in Figures 1 and 4, if the sound absorbing mechanism 20A is located on the ceiling surface of the balcony 12, noise from below can be reflected by the reflecting portion 32A and then absorbed by the sound absorbing portion 32B. Also, as shown in Figures 3 and 4, if the sound absorbing mechanism 20B is located on the side wall surface of the balcony 12, noise from the side can be reflected by the reflecting portion 32A and then absorbed by the sound absorbing portion 32B. This makes it possible to reduce noise both inside and outside the building 10 compared to, for example, a structure in which only a reflecting portion and no sound absorbing portion is provided on the ceiling surface of the balcony 12.

In addition, the reflective portions (reflective portion 32A, slats 34A, 34C, 36A, 36B, 36C, or 38A) of the sound absorbing mechanisms 20A, 20B are inclined relative to the ceiling or sidewall surface of the balcony 12 so as to expand from the window surface of the glass window 14 toward the tip of the balcony 12. This makes it easier to reduce noise from the front of the balcony 12 compared to a configuration in which the reflective portions are parallel to the ceiling or sidewall surface. In addition, the view from the indoor space R is less likely to be obstructed, and lighting into the indoor space R is less likely to be obstructed.

In addition, in the noise reduction structure according to the embodiment of the present invention, the reflecting portion (reflecting portion 32A, blades 34A, 34C, 36A, 36B, 36C, or 38A) is formed on each of the multiple blades. In other words, the reflecting portion is formed in a divided manner.

For this reason, if each blade is arranged "inclined" with respect to the ceiling or side wall surface, for example blade 32 shown in FIG. 3, blade 34A shown in FIG. 5, and blade 34C shown in FIG. 6, even if these blades are "arranged parallel to" the ceiling or side wall surface, since each of these blades is inclined, it is possible to form an inclined reflecting portion that spreads from the window surface of the glass window 14 toward the tip of the balcony 12. In this case, the sound absorbing mechanism can be made more space-saving than in a configuration in which the blades are "arranged diagonally" with respect to the ceiling or side wall surface.

Alternatively, if the sound absorbing mechanism is located on the ceiling surface of the balcony 12, by staggering the positions of each slat in the vertical direction (Z direction) as in slats 36A, 36B, and 36C shown in Figure 7 or 38A shown in Figure 8, a reflective section can be formed that is inclined so as to extend from the window surface of the glass window 14 toward the tip of the balcony 12.

Also, if the sound absorbing mechanism is on the side wall of the balcony 12, by shifting the horizontal (X-direction) positions of each slat, as with slats 36A, 36B, 36C, or 38A, a reflective section can be formed that is inclined so as to extend from the window surface toward the tip of the balcony 12.

10 Building 12 Balcony 20A Sound absorbing mechanism 20B Sound absorbing mechanism 30A Louver 30B Louver 32 Slat 32A Reflection section 32B Sound absorbing section 34 Louver 34A Slat (Reflection section)
34B Sound absorption part 34C Wing plate (reflection part)
36 Louver 36A Blade (reflective part)
36B Feather plate (reflector)
36C feather plate (reflector)
38 Louver 38A Slat (reflective part)
40 Sound absorbing part 50 Punching metal 52 Through hole 54 Porous material

Claims (5)

The sound absorbing mechanism is provided on at least one of a ceiling surface and a side wall surface of a balcony in a building and absorbs noise incident from the outside,
The sound absorbing mechanism includes:
A reflecting section that reflects the noise on the ceiling surface by sloping from the bottom to the top from the inside to the outside in the depth direction of the balcony, or on the side wall surface by sloping from the inside to the outside in the length direction of the balcony to reflect the noise;
A sound absorbing section that absorbs the reflected sound reflected by the reflecting section;
The reflecting portion is formed on each of the plurality of blades.
Noise reduction structure. The sound absorbing mechanism is provided with louvers formed by a plurality of the slats on the ceiling surface that are inclined from the bottom to the top from the inside to the outside in the depth direction of the balcony, or formed by a plurality of the slats on the side wall surface that are inclined from the inside to the outside in the length direction of the balcony ,
The sound absorbing portion is disposed on the back side of the slats or on the ceiling surface or side wall surface on which the sound absorbing mechanism is provided.
The noise reduction structure according to claim 1. The sound absorbing mechanism includes louvers formed by a plurality of the slats arranged on the ceiling surface at positions shifted from the bottom to the top from the inside to the outside in the depth direction of the balcony,
The sound absorbing unit is disposed inside the ceiling, closer to the inside in the depth direction of the balcony than the louver.
The noise reduction structure according to claim 1. The noise reduction structure according to any one of claims 1 to 3, wherein the sound absorbing mechanism is provided on both the ceiling surface and the side wall surface. The noise reduction structure according to any one of claims 1 to 4, wherein the sound absorbing portion is formed from at least one of punching metal and porous material.