JP7689469B2 - 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. However, since the reflecting parts are only provided on the balcony ceiling surface, while it is highly effective at suppressing noise from below the building, its effectiveness at reducing noise from the sides of the building is limited.

For example, the time that noise from a vehicle traveling on the road in front of a building is incident on the building is longer when the vehicle is traveling along the side of the building than when the vehicle is traveling directly underneath the building. For this reason, reducing noise from the side of the building rather than from underneath may have a greater effect on noise reduction over time.

Taking the above facts into consideration, the present invention aims to provide a noise reduction structure that can reduce noise from the side of a building.

The noise reduction structure of claim 1 is provided on a side wall surface of a balcony of a building, and is provided with a reflection section that is inclined from the inside to the outside in the depth direction of the balcony and from the inside to the outside in the longitudinal direction of the balcony , and is capable of reflecting noise incident from outside to the outside of the building.

In the noise reduction structure of claim 1, the side wall of the balcony is provided with a reflecting portion that can reflect noise incident from the outside to the outside of the building. The reflecting portion on the side wall of the balcony reflects noise from the side. This provides a high effect in reducing noise, for example, caused by vehicles traveling on the front road that extends from one side of the building to the other side, passing through the base of the building.

The reflective portion is also inclined so that it spreads out from the window surface toward the end of the balcony. This makes it easier to reduce noise from the direction toward the front of the balcony compared to a configuration in which the reflective portion is parallel to the side wall surface of the balcony. 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 of claim 1, further comprising a reflection section provided on the ceiling surface of the balcony, inclined from bottom to top from the inside to the outside in the depth direction of the balcony, and capable of reflecting noise entering from outside to the outside of the building .

The noise reduction structure of claim 2 is provided with reflecting parts on the balcony ceiling and side wall surfaces. The reflecting parts on the balcony ceiling reflect noise from below. Therefore, the noise reduction structure of claim 2 can reflect noise from the sides and below. This provides a greater noise reduction effect than a structure in which reflecting parts are provided only on the balcony ceiling or only on the side wall surfaces.

The noise reduction structure of claim 3 is the noise reduction structure of claim 1, wherein the reflective portion is a louver formed by a plurality of slats inclined from the inside to the outside in the depth direction of the balcony and from the inside to the outside in the longitudinal direction of the balcony .

In the noise reduction structure of claim 3, the reflecting portion is formed by a plurality of inclined blades. In other words, the reflecting portion is formed in segments.

For this reason, if each slat is placed in an "inclined state" with respect to the side wall surface, even if the slats are "placed parallel to" the side wall surface, a reflective area can be formed that is inclined and spreads out from the window surface toward the edge of the balcony. This allows the sound-absorbing mechanism to take up less space than a structure that uses a single large surface as the reflective area.

The noise reduction structure of claim 4 is the noise reduction structure of claim 2, wherein the reflective portion on at least the ceiling surface is a louver formed by a plurality of slats inclined from the bottom to the top from the inside to the outside in the depth direction of the balcony, or the reflective portion on at least the side wall surface is a louver formed by a plurality of slats inclined from the inside to the outside in the length direction of the balcony .

In the noise reduction structure of claim 4, the reflecting portion is formed by a plurality of inclined blades. In other words, the reflecting portion is formed in segments.

For this reason, if each slat is arranged in an "inclined 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 inclined so that it spreads out from the window surface toward the edge of the balcony. This allows the sound-absorbing mechanism to take up less space than a structure that uses a single large surface as the reflective section.

The noise reduction structure of claim 5 is the noise reduction structure of claim 1, in which the reflecting portions are formed in a stepped manner.

In the noise reduction structure of claim 5, the reflecting portion is formed in a stepped manner. This allows the sound absorbing mechanism to be more space-saving than a structure in which a single large surface is used as the reflecting portion.

The noise reduction structure of claim 6 is the noise reduction structure of claim 2, in which the reflecting portion on at least one of the ceiling surface and the side wall surface is formed in a stepped manner.

In the noise reduction structure of claim 6, the reflecting portion is formed in a stepped manner. This allows the sound absorbing mechanism to take up less space than a structure in which a single large surface is used as the reflecting portion.

This invention can reduce noise coming from the side of a building.

1A is a side cross-sectional view showing an example of a noise reduction structure formed on the side wall surface of a balcony, and FIG. 1B is a cross-sectional view taken along line B-B in FIG. 1A is a side cross-sectional view showing an example of a noise reduction structure formed on the side wall and ceiling surfaces of a balcony, and FIG. 1B is a cross-sectional view taken along line B-B in FIG. 1A is a side cross-sectional view showing an example in which a reflective surface is formed by curving, FIG. 1B is a cross-sectional view along line B-B in FIG. 1A, and FIG. 1C is a partially enlarged plan view showing an example in which a reflective portion is formed by assembling multiple surface materials. 1A is a side cross-sectional view showing an example in which a sound absorbing section is formed in addition to a reflecting section, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A is a side cross-sectional view showing an example of a noise reduction structure formed with louvers, and FIG. 1B is a cross-sectional view taken along line BB in FIG. FIG. 11 is a side cross-sectional view showing a modified example in which the noise reduction structure is formed with louvers. 1A is a plan view showing an example in which a noise reduction structure is formed using curved louvers, and FIG. 1B is a plan view showing an example in which a sound absorbing portion is formed on a louver. 1A is a side cross-sectional view showing an example in which a noise reduction structure is formed in a stepped shape, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 13 is a plan view showing an example in which a noise reduction structure is formed in a stepped shape, in which a sound absorbing portion is formed in addition to a reflecting portion. FIG. 1A is a side cross-sectional view showing a modified example in which the noise reduction structure is formed in a stepped shape, and FIG. 1B is a cross-sectional view taken along line BB in 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 applied to a building 10 and is a noise reduction means intended to reduce noise from the side of the building 10. The noise reduction structure 20 is configured to include a partition member 40.

(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 tip of the slab 16.

In this embodiment, an example is shown in which two dwelling units are arranged in the part of the building 10 facing the main road, but the number of dwelling units arranged in the part facing the main road is not particularly limited.

(Reflecting portion provided on side wall surface)
As shown in Fig. 1B, the balcony 12 is divided by partition members 40. The partition members 40 are installed at the boundary between adjacent dwelling units, dividing the balcony 12 into a number of exclusive use areas and forming the side walls of the exclusive use areas. An "exclusive use area" is an area that is used daily only by the residents of one dwelling unit.

The partition member 40 has two vertical sections 42 and 44 and an inclined section 46. The vertical sections 42, 44 and the inclined section 46 are each formed using a non-flammable plate material such as a calcium silicate board or a flexible board.

The vertical section 42 is a section formed along the vertical direction between the upper and lower slabs 16, and is disposed on the exterior wall surface side of the building 10. The vertical section 42 is also disposed along the short side direction (Y direction) of the balcony 12, and is longer in the Y direction than the vertical section 44.

The vertical section 44, like the vertical section 42, is a section formed along the vertical direction between the upper and lower slabs 16, and is disposed on the exterior wall surface side of the building 10. In addition, the vertical section 44 is disposed at a distance from the vertical section 42 in the longitudinal direction of the balcony 12, and is disposed parallel to the vertical section 42.

The inclined portion 46 is a portion that connects the tip of the vertical portion 42 and the tip of the vertical portion 44. The inclined portion 46 is a portion that is inclined between the upper and lower slabs 16 and expands from the window surface of the glass window 14 toward the tip of the balcony 12 relative to the connected vertical portion 44.

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 with an inclination so as to expand" refers to a state in which the members are arranged with an incline from the inside (toward the center of the balcony 12) to the outside (toward the vertical part 44) in the longitudinal direction (X direction) of the balcony 12.

The vertical sections 42, 44 and the inclined section 46 form the side wall surface of the exclusive use portion of the balcony 12. As described above, the inclined section 46 is formed using a non-flammable plate material such as a calcium silicate board or a flexible board. In addition, a reflective member 50A that forms a reflective surface as a reflective section is fixed to the surface of the inclined section 46. The reflective member 50A is a surface material that is formed from a heavy material such as a metal material such as aluminum or stainless steel, and forms a smooth and hard reflective surface. The material that forms the inclined section 46 may itself be the material that forms the reflective member 50A. In this case, the inclined section 46 forms the reflective surface that is the reflective section.

With this configuration, as shown by the arrow N1 in Figure 1 (B), at least a portion of the incident sound that enters the reflecting member 50A from the side is reflected to the outdoors.

The space V2 formed between the vertical sections 42, 44 and the inclined section 46 can be used as space for installing equipment and piping.

The vertical sections 42, 44 and the inclined section 46 are preferably fixed to a base material made of a metal material such as aluminum or steel, or fitted into a frame or the like. This ensures that the partition member 40 has sufficient rigidity to prevent deformation or scattering when blown by the wind.

(Reflecting portion provided on side wall surface and ceiling surface)
As shown in Figures 2 (A) and (B), the noise reduction structure 20 can also be formed with a reflective member 50A formed on the side wall surface of the balcony 12, as well as a reflective member 50B formed on the ceiling surface of the balcony.

In this embodiment, a ceiling member 30 is provided on the balcony 12 below the slab 16 that forms the floor surface of the upper floor. This ceiling member 30 has a horizontal portion 32 and an inclined portion 34. The horizontal portion 32 and the inclined portion 34 are each formed using a non-flammable board material such as a calcium silicate board.

The horizontal section 32 is a section formed along the horizontal direction below the slab 16, and is disposed on the exterior wall surface side of the building 10. On the other hand, the inclined section 34 is a section formed below the slab 16, inclined upward with respect to the horizontal section 32, and is disposed from the tip of the horizontal section 32 to the tip of the slab 16. The inclined section 34 is inclined so as to widen 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, as described above, 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 a state in which the balcony 12 is arranged at an incline from the bottom to the top in the vertical direction (Z direction) of the balcony 12.

The lower surfaces of the horizontal portion 32 and the inclined portion 34 form the ceiling surface of the balcony 12. As described above, the inclined portion 34 is formed using a non-flammable plate material such as a calcium silicate board or a flexible board. In addition, a reflective member 50B that forms a reflective surface as a reflective portion is fixed to the surface of the inclined portion 34. The reflective member 50B is a surface material that is formed from a heavy material such as a metal material such as aluminum or stainless steel, and forms a smooth and hard reflective surface. The material that forms the inclined portion 34 may itself be the material that forms the reflective member 50B. In this case, the inclined portion 34 forms the reflective surface that is the reflective portion.

With this configuration, as shown by the arrow N2 in Figure 2 (A), at least a portion of the incident sound that enters the reflecting member 50B from below is reflected to the outdoors.

The space V1 formed between the slab 16 that forms the floor surface of the upper floor and the ceiling member 30 can be used as a space for installing equipment and piping.

In addition, like the vertical sections 42, 44 and inclined section 46, the horizontal section 32 and the inclined section 34 are preferably fixed to a base material made of a metal material such as aluminum or steel, or fitted into a frame or the like. This ensures that the ceiling member 30 has sufficient rigidity to not deform or shatter when blown by the wind.

<Action and Effects>
In the noise reduction structure 20 according to the embodiment of the present invention, as shown in FIG. 1(B), a side wall surface of the balcony 12 is provided with a reflective member 50A capable of reflecting noise incident from the outside to the outside of the building 10.

The reflecting member 50A on the side wall surface of the balcony 12 reflects noise from the side, as shown by the arrow N1. This effectively reduces noise, for example, caused by vehicles traveling on the front road that runs from one side of the building 10 to the other side, passing through the base of the building 10.

The reflecting portion 50 is also inclined so as to widen 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 compared to a configuration in which the reflecting portion is parallel to the side wall surface of the balcony 12. It also makes it less likely to obstruct the view from the indoor space R, and less likely to obstruct the lighting of the indoor space R. Furthermore, the reflecting area can be made larger compared to a configuration in which the reflecting portion is parallel to the side wall surface of the balcony 12, thereby improving the noise reduction effect.

In addition, as shown in Figures 2(A) and (B), if the ceiling surface of the balcony is also provided with reflecting members 50B, noise from below can be reflected, as shown by arrow N2. Therefore, the noise reduction effect is greater than in a structure in which only the ceiling surface or only the side wall surface of the balcony is provided with reflecting parts.

<Examples of noise reduction structures>
Hereinafter, examples of developments of the noise reduction structure will be described. In this specification, examples of developments described as being provided on both the side wall surfaces and the ceiling surface may be those provided only on the side wall surfaces. Also, examples of developments described as being provided on only the side wall surfaces may be those provided on both the side wall surfaces and the ceiling surface.

(Examples of reflective part shapes)
The reflecting member 50A shown in Fig. 1 and the reflecting member 50B shown in Fig. 2 are fixed to the inclined portion 46 and the inclined portion 34, respectively, and form a "flat (in other words, non-curved) reflecting surface." In contrast, the reflecting members 60A and 60B shown in Fig. 3(A) and (B) form a "curved reflecting surface" as a reflecting portion.

The reflecting surfaces of the reflecting members 60A and 60B are curved surfaces that are inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12. In this way, the reflecting portion of the present invention may be curved.

In FIG. 3B, the reflecting member 60A is a single member fixed to the side of the partition plate 18, and the side facing the longitudinal direction (X direction) of the balcony 12 forms a reflecting surface as a reflecting portion, but the embodiment of the present invention is not limited to this.

For example, as shown in FIG. 3(C), multiple panel materials may be attached to the side of the partition plate 18, and the reflective member 60A may be formed by the panel material facing the longitudinal direction (X direction) of the balcony 12. This configuration in which multiple panel materials are attached to form a reflective portion can be applied to the reflective member 60B shown in FIG. 3(A) as well as to each of the development examples shown below.

With this configuration, as shown by the arrow N3 in FIG. 3(A), at least a portion of the incident sound that enters the reflecting member 60B from below is reflected to the outdoors. Also, as shown by the arrow N4 in FIG. 3(B), at least a portion of the incident sound that enters the reflecting member 60B from the side is reflected to the outdoors.

(Example of a sound-absorbing section installed)
The noise reduction structure 20 may be formed with a sound absorbing portion. Figures 4(A) and (B) show reflecting members 62A and 62B that form a flat reflecting surface as a reflecting portion. The reflecting surfaces of the reflecting members 62A and 62B are surfaces that are inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12.

As shown in FIG. 4(A), a sound absorbing section 64B is provided on the ceiling surface of the balcony 12 (the underside of the slab 16) closer to the glass window 14 than the reflecting member 62B (inside the balcony in the depth direction).

The sound absorbing section 64B is a plate-shaped sound absorbing member formed, for example, from punched metal or porous material, and is arranged from the underside (horizontal surface) of the slab 16 to the outer wall surface (vertical surface) of the building 10. Note that the sound absorbing section 64B may be provided only on either the underside (horizontal surface) of the slab 16 or the outer wall surface (vertical surface) of the building 10.

With this configuration, as shown by arrow N5 in FIG. 4(A), at least a portion of the incident sound that enters the reflecting member 62B from below is reflected multiple times and then enters the sound absorbing section 64B and is absorbed. Note that, depending on the angle of incidence, the incident sound that enters the reflecting member 62B from below is reflected to the outdoors as shown by arrow N6.

Similarly, as shown in FIG. 4(B), a sound absorbing section 64A is provided on the side wall surface of the balcony 12 (the side surface of the partition plate 18) closer to the glass window 14 than the reflecting member 62A.

Sound absorbing section 64A, like sound absorbing section 64B, is a plate-shaped sound absorbing member formed, for example, from punched metal, and is arranged from the side of partition plate 18 to the exterior wall surface of building 10. Note that sound absorbing section 64A may be provided only on either the side of partition plate 18 or the exterior wall surface of building 10.

With this configuration, as shown by arrow N7 in FIG. 4B, at least a portion of the incident sound that enters the reflecting member 62A from the side enters the sound absorbing section 64A and is absorbed. Note that, depending on the angle of incidence, the incident sound that enters the reflecting member 62A from the side is reflected to the outdoors as shown by arrow N8.

Such a sound absorbing section 64A may be applied to the vertical section 44 shown in FIG. 1. Similarly, the sound absorbing section 64B may be applied to the horizontal section 32 shown in FIG. 2.

(Example of development in which the reflective area is formed by louvers)
In the embodiment shown in Figures 1 to 4, the reflective portion formed on the side wall surface and ceiling surface of the balcony 12 forms one large surface, but the reflective portion can also be formed by dividing it into multiple parts.

For example, Figs. 5(A) and (B) show louvers 66, 68 as reflective sections. As shown in Fig. 5(A), the louvers 66 are formed by a number of blades 66A. The blades 66A 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. 5(B), the blades 66A are arranged over substantially the entire area between the partitions 18 arranged on both sides of the balcony 12 in the X direction.

As shown in FIG. 5(A), the blades 66A are arranged on the ceiling surface at an angle so as to expand from the window surface of the glass window 14 toward the end of the balcony 12. In other words, the blades 66A are arranged at an angle so that the lower end is located inside the balcony 12 in the depth direction, and the upper end is located outside the balcony 12 in the depth direction.

Note that the "ceiling surface" here refers to the area near the slab 16 above the balcony 12 (a position closer to the upper slab than the lower slab).

The blades 66A are arranged in a line in the vertical direction (Z direction) with each blade inclined in this manner. In FIG. 5(A), three blades 66A are shown arranged, but the number of blades 66A arranged is not particularly limited as long as it is two or more.

With this configuration, as shown by arrow N9 in FIG. 5(A), at least a portion of the sound that enters the louver 66 from below is reflected from the slats 66A to the outdoors. Note that multiple slats 66A may be arranged in a line along the depth direction of the balcony 12, as shown in FIG. 6.

Similarly, as shown in FIG. 5(B), the louvers 68 are formed by a number of blades 68A. The blades 68A are long, flat members arranged so that their longitudinal direction coincides with the vertical direction (Z direction) of the balcony 12. Also, as shown in FIG. 5(A), the blades 68A are arranged across the space between the upper and lower slabs 16 of the balcony 12.

As shown in FIG. 5B, the blades 68A are arranged on the side wall surface of the balcony 12 at an angle so as to expand from the window surface of the glass window 14 toward the tip of the balcony 12. In other words, the blades 68A are arranged at an angle so that the inner end of the blades 68A is arranged inside the balcony 12 in the depth direction, and the outer end is arranged outside the balcony 12 in the depth direction.

Note that the "side wall surface" here refers to the area near the partition 18 that separates the verandas 12 between adjacent dwelling units (the area within approximately 50 cm of the partition).

The slats 68A are arranged in a line along the depth direction (Y direction) of the balcony 12, with each slat inclined in this manner. In FIG. 5(B), three slats 68A are shown arranged, but the number of slats 68A arranged is not particularly limited as long as it is two or more.

With this configuration, as shown by arrow N10 in Figure 5 (B), at least a portion of the incident sound that enters the louver 68 from the side is reflected from the slats 68A to the outdoors.

(Variation 1)
Even when forming a reflective portion using a louver, it is possible to form a sound absorbing portion. For example, Fig. 7A shows a louver 70 formed using a plurality of blades 70A and a sound absorbing portion 72.

The reflective portion, the slats 70A, are curved so that they are convex toward the outdoor side of the balcony 12. The sound absorbing portion 72 covers at least a portion of the partition plate 18 that forms the side wall surface of the balcony 12. The sound absorbing portion 72 can be formed using the same material as the sound absorbing portions 64A and 64B described above.

By forming the blades as the reflecting parts in a curved shape, the incident sound that enters the louvers 70 from the side has a larger reflection angle, and is therefore more likely to be reflected towards the partition plate 18. Therefore, by providing the partition plate 18 with a sound absorbing part 72, as shown by the arrow N11 in FIG. 7(A), at least a portion of the incident sound that enters the louvers 70 from the side enters the sound absorbing part 72 and is absorbed.

The reflective section formed by bending the blades in this way does not necessarily have to be used in conjunction with the sound absorbing section. That is, in Figures 5 and 6, louvers 70 may be used instead of louvers 66 and 68.

(Variation 2)
The sound absorbing portion may be formed on the blades forming the louvers. For example, the blades 74 forming the louvers 76 shown in Fig. 7B each include a reflecting portion 74A and a sound absorbing portion 74B.

The reflecting portion 74A is formed on the front side of the slat 74 (the surface facing the longitudinal center of the balcony 12), and the sound absorbing portion 74B is formed on the back side of the slat 74 (the surface facing the partition plate 18). The sound absorbing portion 74B can be formed using the same material as the sound absorbing portions 64A and 64B described above.

By providing the slats 74 with the reflecting section 74A and the sound absorbing section 74B, as shown by the arrow N12 in FIG. 7B, at least a portion of the incident sound that enters the louver 76 from the side is absorbed by entering the sound absorbing section 74B. Note that the incident sound that enters the louver 76 from the side is reflected to the outdoors as shown by the arrow N13, depending on the incident position and incident angle.

In the examples shown in Figures 5, 6, and 7, the reflective portion is divided and formed by using louvers. Therefore, if each slat is arranged in an "inclined state" with respect to the side wall surface, for example as in slat 68A shown in Figure 5(B), even if the slats are "arranged parallel to" the side wall surface, a reflective portion 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.

Similarly, if each slat is arranged in a "slanted state" relative to the ceiling surface, as in the case of slat 66A shown in Figures 5 (A) and 6, even if the slats are "arranged parallel to each other" in the vertical direction or in the depth direction of the balcony 12, a reflective portion 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.

In this way, by dividing the reflecting portion, the sound absorbing mechanism can be made more space-saving compared to a structure in which the reflecting portion is a single large surface.

(Example of development in which the reflecting part is formed in a stepped shape)
As an embodiment in which the reflecting portion is divided into a plurality of portions, in addition to using louvers as shown in Figures 5, 6 and 7, the reflecting portion may be formed in a stepped shape. Forming the reflecting portion in a stepped shape also makes it possible to save space for the sound absorbing mechanism.

For example, in the example shown in FIG. 8(A), a reflective member 80 is provided on the ceiling surface of the balcony 12 (the underside of the upper slab 16). The reflective member 80 has multiple reflective surfaces 80A that are inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12. Adjacent reflective surfaces 80A are arranged in a stepped manner with step surfaces 80B interposed between them.

With this configuration, as shown by arrow N14, at least a portion of the incident sound that enters the reflecting member 80 from the side is reflected from the reflecting surface 80A to the outdoors.

Similarly, in the example shown in FIG. 8(B), a reflective member 82 is provided on the side wall surface of the balcony 12. The reflective member 82 has multiple reflective surfaces 82A that are inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12. Adjacent reflective surfaces 82A are arranged in a stepped manner with step surfaces 82B interposed between them.

With this configuration, as shown by arrow N15, at least a portion of the incident sound that enters the reflecting member 82 from the side is reflected from the reflecting surface 82A to the outdoors.

In addition, as shown in FIG. 9, a sound absorbing section 84 may be provided on the step surface 82B. The sound absorbing section 84 may be formed using the same material as the sound absorbing sections 64A and 64B described above. By providing the sound absorbing section 84 on the reflecting member 82, as shown by the arrow N16 in FIG. 9, at least a portion of the incident sound that enters the reflecting member 82 from the side enters the sound absorbing section 84 and is absorbed. Such a sound absorbing section may be provided on the step surface 80B of the reflecting member 80 shown in FIG. 8(A).

(Modification)
In the example shown in Figures 8 (A) and (B), the reflecting surfaces 80A, 82A are inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12, but the embodiment of the present invention is not limited to this.

For example, the reflecting surfaces can be configured not to be inclined, as in the reflecting members 86 and 88 shown in Figures 10(A) and (B) as reflecting portions. Specifically, in the reflecting member 86 shown in Figure 10(A), reflecting surfaces 86A aligned along the vertical direction (Z direction) of the balcony 12 and reflecting surfaces 86B aligned along the depth direction (Y direction) of the balcony 12 are alternately arranged in a stepped manner.

In this configuration, the reflective surfaces 86A and 86B are arranged in a stepped manner, forming a reflective member 86 that acts as a reflective portion that is inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12.

With this configuration, as shown by arrow N16 in FIG. 10(A), at least a portion of the incident sound that enters the reflecting member 86 from below is reflected to the outdoors from the reflecting surfaces 86A and 86B. Also, depending on the angle of incidence, the incident sound that enters the reflecting member 86 from below is reflected to the outdoors from either the reflecting surfaces 86A or 86B.

Similarly, in the reflecting member 88 shown in FIG. 10(B), reflecting surfaces 88A aligned along the longitudinal direction (X direction) of the balcony 12 and reflecting surfaces 88B aligned along the depth direction (Y direction) of the balcony 12 are alternately arranged in a stepped pattern.

In this configuration, the reflective surfaces 88A and 88B are arranged in a stepped manner, forming a reflective member 88 that acts as a reflective portion that is inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12.

With this configuration, as shown by arrow N17 in FIG. 10(B), at least a portion of the incident sound that enters the reflecting member 88 from the side is reflected from the reflecting surfaces 88A and 88B to the outdoor side. Also, depending on the angle of incidence, the incident sound that enters the reflecting member 88 from the side is reflected from one of the reflecting surfaces 88A and 88B to the outdoor side.

In this way, the "reflective portion that is inclined so as to widen from the window surface toward the end of the balcony" in this invention does not necessarily mean that the reflective surface itself is inclined, but rather that the reflective member including the reflective surface is inclined.

10 Building 12 Balcony 14 Glass window (window)
50A Reflective member 50B Reflective member 60A Reflective member 60B Reflective member 62A Reflective member 62B Reflective member 66 Louver 66A Blade 68 Louver 68A Blade 70 Louver 70A Blade 76 Louver 74 Blade 74A Reflective portion 80 Reflective member 80A Reflective surface 82 Reflective member 82A Reflective surface 86 Reflective member 86A Reflective surface 86B Reflective surface 88 Reflective member 88A Reflective surface 88B Reflective surface

Claims (6)

A noise reduction structure is provided on the side wall surface of a balcony of a building, and has a reflection section that slopes from the inside to the outside in the depth direction of the balcony and from the inside to the outside in the longitudinal direction of the balcony, and is capable of reflecting noise incident from outside to the outside of the building. A noise reduction structure as described in claim 1, further comprising a reflection section provided on the ceiling surface of the balcony, inclined from bottom to top from the inside to the outside in the depth direction of the balcony, and capable of reflecting noise incident from outside to the outside of the building . The reflecting portion is
2. The noise reduction structure according to claim 1, wherein the louvers are formed of a plurality of slats inclined from the inside to the outside in the depth direction of the balcony and from the inside to the outside in the longitudinal direction of the balcony . At least the reflective portion on the ceiling surface is a louver formed by a plurality of blades inclined from the bottom to the top from the inside to the outside in the depth direction of the balcony.
Or,
At least the reflective portion on the side wall surface is a louver formed by a plurality of blades inclined from the inside to the outside in the depth direction of the balcony and from the inside to the outside in the longitudinal direction of the balcony.
The noise reduction structure according to claim 2. The noise reduction structure according to claim 1, wherein the reflecting portions are formed in a stepped manner. The noise reduction structure according to claim 2, wherein the reflecting portion on at least one of the ceiling surface and the side wall surface is formed in a stepped manner.