Noise reduction structure

Abstract

To provide a noise reduction structure capable of reducing noise from a lateral part of a building.SOLUTION: A noise reduction structure 20 includes a reflection unit 50A that is provided in a side wall surface of a veranda 12 in a building 10, inclines so as to expand from a window surface toward a tip end of the veranda 12, and can reflect noise from the outside to the outside of the building 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a noise reduction structure. [Background technology]

[0002] The following Patent Document 1 describes a sound-insulating balcony structure with 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 with respect to the propagation direction of the direct noise waves is set to 90 degrees or more, thereby reducing noise incident on the window openings of the building. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-211509 A Summary of the Invention [Problem to be solved by the invention]

[0004] The soundproof balcony structure of Patent Document 1 reflects noise to the outside of the building. However, since the reflecting portion is provided only on the balcony ceiling surface, the effect of suppressing noise from below the building is high, but the effect of reducing noise from the side of the building is limited.

[0005] 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 may have a greater effect on noise reduction over time than reducing noise from below the building.

[0006] In consideration of the above, an object of the present invention is to provide a noise reduction structure that can reduce noise from the side of a building. [Means for solving the problem]

[0007] The noise reduction structure of claim 1 is provided on a side wall surface of a balcony of a building, From the inside to the outside in the depth direction of the veranda, from the inside to the outside in the longitudinal direction of the veranda The structure is inclined and has a reflecting portion capable of reflecting noise incident from the outside to the outside of the building.

[0008] In the noise reduction structure of claim 1, the side wall of the balcony is provided with a reflecting portion capable of reflecting 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 effectively reduces noise, for example, caused by vehicles passing on the front road that runs from one side of the building to the other side, passing under the base of the building.

[0009] In addition, the reflecting section is inclined so that it spreads from the window surface toward the end of the balcony. Therefore, compared to a configuration in which the reflecting section is parallel to the side wall of the balcony, it is easier to reduce noise from the direction closer to the front of the balcony. It is also less likely to obstruct the view from inside the room, and less likely to obstruct the entry of light into the room.

[0010] The noise reduction structure of claim 2 is the noise reduction structure of claim 1, The building may further include a reflecting section that is provided on the ceiling surface of the balcony, inclined from the bottom to the top from the inside to the outside in the depth direction of the balcony, and capable of reflecting noise incident from the outside to the outside of the building. .

[0011] 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.

[0012] The noise reduction structure of claim 3 is the noise reduction structure of claim 1, wherein the reflecting portion is From the inside to the outside in the depth direction of the veranda, from the inside to the outside in the longitudinal direction of the veranda The louvers are formed by a number of inclined slats.

[0013] In the noise reduction structure of claim 3, the reflecting portion is formed by a plurality of inclined blades, that is, the reflecting portion is formed in sections.

[0014] For this reason, if each slat is arranged in an "inclined state" with respect to the side wall surface, for example by "arranging these slats in a row" to the side wall surface, it is possible to form a reflective section 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.

[0015] The noise reduction structure of claim 4 is the noise reduction structure of claim 2, At least the reflective portion on 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 at least the reflective portion on the side wall surface is a louver formed by a plurality of slats inclined from the inside to the outside in the longitudinal direction of the balcony from the inside to the outside in the depth direction of the balcony. .

[0016] In the noise reduction structure of claim 4, the reflecting portion is formed by a plurality of inclined blades, that is, the reflecting portion is formed in sections.

[0017] For this reason, if each slat is arranged "inclined" with respect to the ceiling or side wall, for example, even if these slats are "arranged parallel to" the ceiling or side wall, a reflective area 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 area.

[0018] A noise reduction structure according to claim 5 is the noise reduction structure according to claim 1, wherein the reflecting portion is formed in a stepped shape.

[0019] In the noise reduction structure of claim 5, the reflecting portion is formed in a stepped manner, which 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.

[0020] A noise reduction structure according to a sixth aspect of the present invention is the noise reduction structure according to the second aspect, wherein the reflecting portion on at least one of the ceiling surface and the side wall surface is formed in a stepped shape.

[0021] In the noise reduction structure of claim 6, the reflecting portion is formed in a stepped manner, which 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. Effect of the Invention

[0022] According to the present invention, noise from the side of a building can be reduced. [Brief description of the drawings]

[0023] [Figure 1] 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 BB in FIG. [Diagram 2] 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 BB in FIG. [Diagram 3] 1A is a side cross-sectional view showing an example in which the reflective surface is curved, FIG. 1B is a cross-sectional view along line BB 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. [Figure 4] 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. [Diagram 5] 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. [Figure 6] FIG. 11 is a side cross-sectional view showing a modified example in which the noise reduction structure is formed with louvers. [Figure 7] FIG. 1A is a plan view showing an example in which a noise reduction structure is formed with curved louvers, and FIG. 1B is a plan view showing an example in which sound absorbing parts are formed on the louvers. [Figure 8] FIG. 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. [Figure 9] 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. [Figure 10] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a noise reduction structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by 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 may be present in multiple numbers.

[0025] In addition, the description of the same configuration and reference numerals in each drawing may be omitted. Note that the present invention is not limited to the following embodiment, and may be modified as appropriate within the scope of the object of the present invention, such as omitting configurations or replacing them with different configurations.

[0026] In each figure, the directions indicated by the arrows X and Y are directions along the 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). The directions indicated by the arrows X, Y, and Z in each figure are assumed to be mutually consistent.

[0027] <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 suppress noise from the side of the building 10. The noise reduction structure 20 is configured to include a partition member 40.

[0028] (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.

[0029] An arterial 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 arranged along the direction of the lanes on the arterial road. Note that various roads other than the arterial road, train tracks, and the like may also run in front of the building 10.

[0030] 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 disposed along the longitudinal direction of the balcony 12. A slab 16 is formed on the outside of the glass window 14.

[0031] The slab 16 is a cantilevered slab that protrudes outward from the building 10, and is provided on each floor of the building 10 to form the floor surface of the balcony 12 on each floor. A handrail 16A is provided at the tip of the slab 16.

[0032] In this embodiment, an example of building 10 having two dwelling units arranged in a portion facing a main road is shown, but the number of dwelling units arranged in a portion facing a main road is not particularly limited.

[0033] (Reflecting portion provided on the side wall surface) As shown in Fig. 1(B), 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.

[0034] The partition member 40 includes two vertical portions 42 and 44 and an inclined portion 46. The vertical portions 42, 44 and the inclined portion 46 are each formed using a non-combustible plate material such as a calcium silicate board or a flexible board.

[0035] The vertical portion 42 is a portion formed along the vertical direction between the upper and lower slabs 16, and is disposed on the outer wall surface side of the building 10. The vertical portion 42 is disposed along the short side direction (Y direction) of the balcony 12, and is longer in the Y direction than the vertical portion 44.

[0036] The vertical portion 44, like the vertical portion 42, is a portion formed along the vertical direction between the upper and lower slabs 16, and is disposed on the outer wall surface side of the building 10. The vertical portion 44 is disposed apart from the vertical portion 42 in the longitudinal direction of the balcony 12 and parallel to the vertical portion 42.

[0037] 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 with respect to the connected vertical portion 44.

[0038] Here, "from the window surface of glass window 14 toward the end of balcony 12" refers to going from the inside to the outside in the depth direction (Y direction) of balcony 12. "Arranged with an incline so as to expand" refers to a state in which the members are arranged with an incline from the inside (toward the center of balcony 12) to the outside (toward vertical portion 44) in the longitudinal direction (X direction) of balcony 12.

[0039] The vertical parts 42, 44 and the inclined part 46 form the side wall surface of the exclusive use part of the balcony 12. As described above, the inclined part 46 is formed using a non-flammable plate material such as a calcium silicate board or a flexible board. In addition, a reflecting member 50A that forms a reflecting surface as a reflecting part is fixed to the surface of the inclined part 46. The reflecting member 50A is a surface material that is formed of a heavy material such as a metal material such as aluminum or stainless steel, and forms a smooth and hard reflecting surface. The material that forms the inclined part 46 may itself be the material that forms the reflecting member 50A. In this case, the inclined part 46 forms the reflecting surface that is the reflecting part.

[0040] With this configuration, as shown by an arrow N1 in FIG. 1(B), at least a portion of the incident sound that enters the reflecting member 50A from the side is reflected to the outdoors.

[0041] A space V2 formed between the vertical portions 42, 44 and the inclined portion 46 can be used as a space for installing equipment and piping.

[0042] It is preferable that the vertical portions 42, 44 and the inclined portion 46 are fixed to a base material formed of a metal material such as aluminum or steel, or fitted into a frame or the like, so that the partition member 40 has a sufficient rigidity to prevent deformation or scattering when blown by the wind.

[0043] (Reflecting parts provided on the side walls and ceiling) As shown in Figures 2(A) and (B), the noise reduction structure 20 can 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.

[0044] In this embodiment, a ceiling member 30 is provided below the slab 16 that forms the floor surface of the upper floor of the balcony 12. 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-combustible board material such as a calcium silicate board.

[0045] The horizontal section 32 is a section formed along the horizontal direction below the slab 16, and is disposed on the outer wall surface side of the building 10. On the other hand, the inclined section 34 is a section formed below the slab 16 and 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.

[0046] Here, "from the window surface of the glass window 14 toward the end of the balcony 12" refers to, as described 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 bottom to the top in the vertical direction (Z direction) of the balcony 12.

[0047] 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 reflecting member 50B that forms a reflecting surface as a reflecting portion is fixed to the surface of the inclined portion 34. The reflecting member 50B is a surface material that is formed of a heavy material such as a metal material such as aluminum or stainless steel, and forms a smooth and hard reflecting surface. The material that forms the inclined portion 34 may itself be the material that forms the reflecting member 50B. In this case, the inclined portion 34 forms the reflecting surface that is the reflecting portion.

[0048] With this configuration, as shown by the arrow N2 in FIG. 2(A), at least a portion of the incident sound that enters the reflecting member 50B from below is reflected to the outdoors.

[0049] A space V1 formed between the slab 16 forming the floor surface of the upper floor and the ceiling member 30 can be used as a space for installing equipment and piping.

[0050] It is preferable that the horizontal portion 32 and the inclined portion 34 are fixed to a base material made of a metal material such as aluminum or steel, or fitted into a frame, in the same manner as the vertical portions 42, 44 and the inclined portion 46. This ensures that the ceiling member 30 has sufficient rigidity to prevent deformation or scattering when blown by the wind.

[0051] <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 reflecting member 50A capable of reflecting noise incident from the outside to the outside of the building 10.

[0052] Reflecting member 50A on the side wall surface of balcony 12 reflects noise from the side as shown by arrow N1. This effectively reduces noise, for example, caused by vehicles traveling on the front road that extends from one side of building 10 to the other side, passing under the base of building 10.

[0053] Also, the reflecting portion 50 is inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12. Therefore, compared to a configuration in which the reflecting portion is parallel to the side wall surface of the balcony 12, it is easier to reduce noise from the front of the balcony. Also, it is less likely to obstruct the view from the indoor space R, and it is less likely to obstruct the lighting into the indoor space R. Furthermore, compared to a configuration in which the reflecting portion is parallel to the side wall surface of the balcony 12, the reflective area can be made larger, so the noise reduction effect can be improved.

[0054] 2(A) and (B), if the ceiling of the balcony is also provided with reflecting members 50B, noise from below can be reflected as shown by arrow N2. This provides a greater noise reduction effect than a structure in which reflecting parts are provided only on the balcony ceiling or side walls.

[0055] <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.

[0056] (Example of reflective part shape development) 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.

[0057] 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 end of the balcony 12. In this manner, the reflecting portion in the present invention may be curved.

[0058] In addition, in Figure 3 (B), the reflective 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 reflective surface as a reflective portion, but the embodiment of the present invention is not limited to this.

[0059] For example, as shown in Fig. 3(C), multiple panel materials may be attached to the side surface 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.

[0060] With this configuration, as shown by the arrow N3 in Fig. 3(A), at least a part 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 part of the incident sound that enters the reflecting member 60B from the side is reflected to the outdoors.

[0061] (Example of deployment with sound absorbing parts) 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.

[0062] As shown in FIG. 4(A), on the ceiling surface of the balcony 12 (the underside of the slab 16), a sound absorbing section 64B is provided on the side of the glass window 14 from the reflecting member 62B (inner side in the depth direction of the balcony).

[0063] The sound absorbing section 64B is a plate-shaped sound absorbing member formed of, for example, punching metal or a porous material, and is disposed from the lower surface (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 lower surface (horizontal surface) of the slab 16 or the outer wall surface (vertical surface) of the building 10.

[0064] With this configuration, as shown by arrow N5 in Fig. 4(A), at least a part of the incident sound entering the reflecting member 62B from below is reflected multiple times and then enters the sound absorbing section 64B and is absorbed. Note that the incident sound entering the reflecting member 62B from below is reflected to the outdoors as shown by arrow N6 depending on the angle of incidence.

[0065] Similarly, as shown in FIG. 4(B), on the side wall surface of the balcony 12 (the side surface of the partition board 18), a sound absorbing portion 64A is provided on a portion closer to the glass window 14 than the reflecting member 62A.

[0066] Like sound absorbing section 64B, sound absorbing section 64A is a plate-shaped sound absorbing member formed of, for example, punching metal, and is disposed from the side surface of partition plate 18 to the outer wall surface of building 10. Note that sound absorbing section 64A may be provided only on either the side surface of partition plate 18 or the outer wall surface of building 10.

[0067] With this configuration, as shown by arrow N7 in Fig. 4(B), at least a part of the incident sound that enters the reflecting member 62A from the side is incident on the sound absorbing section 64A and absorbed. Note that the incident sound that enters the reflecting member 62A from the side is reflected to the outside as shown by arrow N8 depending on the angle of incidence.

[0068] 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.

[0069] (Example of development in which the reflective part is formed by louvers) In the embodiment shown in Figures 1 to 4, the reflecting portion formed on the side wall surface and ceiling surface of the balcony 12 forms one large surface, but the reflecting portion can also be divided into multiple parts.

[0070] For example, Figures 5(A) and (B) show louvers 66, 68 as reflecting sections. As shown in Figure 5(A), louvers 66 are formed of multiple slats 66A. Slats 66A are long, flat members arranged so that their longitudinal direction coincides with the longitudinal direction (X direction) of balcony 12. As shown in Figure 5(B), slats 66A are arranged over substantially the entire area between partitions 18 arranged on both sides of balcony 12 in the X direction.

[0071] 5(A), the blade 66A is disposed on the ceiling surface at an incline so as to widen from the window surface of the glass window 14 toward the end of the balcony 12. In other words, the blade 66A is disposed at an incline so that the lower end of the blade 66A is disposed on the inside in the depth direction of the balcony 12, and the upper end of the blade 66A is disposed on the outside in the depth direction of the balcony 12.

[0072] It should be noted that the "ceiling surface" here refers to the vicinity of the slab 16 above the balcony 12 (a position closer to the upper slab than the lower slab).

[0073] The blades 66A are arranged in a line in the vertical direction (Z direction) with each blade being inclined in this manner. In Fig. 5(A), three blades 66A are illustrated arranged, but the number of blades 66A arranged is not particularly limited as long as it is two or more.

[0074] With this configuration, as shown by arrow N9 in Fig. 5(A), at least a portion of the sound incident on louver 66 from below is reflected from slats 66A to the outdoors. Note that, as shown in Fig. 6, multiple slats 66A may be arranged in a line along the depth direction of balcony 12.

[0075] Similarly, as shown in Fig. 5(B), louver 68 is formed of multiple slats 68A. Slats 68A are long flat members arranged so that their longitudinal direction coincides with the vertical direction (Z direction) of balcony 12. Also, as shown in Fig. 5(A), slats 68A are arranged across between the upper and lower slabs 16 of balcony 12.

[0076] 5(B), the blades 68A are arranged on the side wall surface of the balcony 12 at an angle so as to widen 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 blade 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.

[0077] In this case, the "side wall surface" refers to the vicinity of the partition 18 that separates the veranda 12 between adjacent dwelling units (the portion within approximately 50 cm of the partition).

[0078] The slats 68A are arranged in a row along the depth direction (Y direction) of the balcony 12, with each slat being 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.

[0079] With this configuration, as indicated by arrow N10 in FIG. 5(B), at least a portion of the incident sound that enters louver 68 from the side is reflected from slats 68A to the outdoors.

[0080] (Variation 1) Even when forming a reflective portion using a louver, it is possible to form a sound absorbing portion. For example, Fig. 7(A) shows a louver 70 formed using multiple blades 70A and a sound absorbing portion 72.

[0081] The reflective portion, slat 70A, is curved so as to be convex toward the outdoor side of balcony 12. Sound absorbing portion 72 covers at least a portion of partition plate 18 that forms the side wall surface of balcony 12. Sound absorbing portion 72 can be formed using the same material as sound absorbing portions 64A and 64B described above.

[0082] By forming the blades as the reflecting parts in a curved manner, the reflection angle of the incident sound that enters the louvers 70 from the side increases, and the incident sound is more likely to be reflected toward the partition plate 18. For this reason, by providing the partition plate 18 with the sound absorbing parts 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 parts 72 and is absorbed.

[0083] It should be noted that the reflective portion formed by bending the blades in this manner does not necessarily have to be used in conjunction with the sound absorbing portion. That is, louvers 70 may be used in place of louvers 66 and 68 in Figs.

[0084] (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 reflective portion 74A and a sound absorbing portion 74B.

[0085] The reflective 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 (the surface facing the partition board 18) of the slat 74. The sound absorbing portion 74B can be formed using the same material as the sound absorbing portions 64A and 64B described above.

[0086] By providing reflective portions 74A and sound absorbing portions 74B on the slats 74, at least a portion of the incident sound that enters the louvers 76 from the side is absorbed by entering the sound absorbing portions 74B, as shown by arrows N12 in Fig. 7(B). Note that the incident sound that enters the louvers 76 from the side is reflected to the outdoors, as shown by arrows N13, depending on the incident position and incident angle.

[0087] In the examples shown in Figures 5, 6, and 7, the reflective portion is divided and formed by using louvers. Therefore, by arranging each slat "inclined" 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, it is possible to form an inclined reflective portion that spreads from the window surface of glass window 14 toward the end of balcony 12.

[0088] Similarly, by arranging each slat in an "inclined 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 one another" 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.

[0089] In this way, by forming the reflecting portion in a divided manner, the sound absorbing mechanism can be made more compact than in a structure in which the reflecting portion is made up of a single large surface.

[0090] (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.

[0091] 8(A), for example, a reflective member 80 is provided on the ceiling surface (the underside of the upper slab 16) of the balcony 12. The reflective member 80 has a plurality of 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.

[0092] 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.

[0093] Similarly, in the example shown in Fig. 8(B), a reflecting member 82 is provided on the side wall surface of the balcony 12. The reflecting member 82 has a plurality of reflecting surfaces 82A that are inclined so as to widen from the window surface of the glass window 14 toward the end of the balcony 12. Adjacent reflecting surfaces 82A are arranged in a stepped manner with step surfaces 82B interposed therebetween.

[0094] With this configuration, as indicated 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.

[0095] Incidentally, a sound absorbing section 84 may be provided on the step surface 82B as shown in Fig. 9. 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 part 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).

[0096] (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.

[0097] For example, the reflecting surface may not be inclined as in the reflecting members 86 and 88 shown in Figures 10(A) and 10(B) as the reflecting portion. Specifically, in the reflecting member 86 shown in Figure 10(A), reflecting surface 86A along the vertical direction (Z direction) of the balcony 12 and reflecting surface 86B along the depth direction (Y direction) of the balcony 12 are alternately arranged in a stepped manner.

[0098] In this configuration, the reflective surfaces 86A and 86B are connected in a stepped manner, forming a reflective member 86 as a reflective portion that is inclined so as to widen from the window surface of the glass window 14 toward the end of the balcony 12.

[0099] 10(A), at least a part 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, the incident sound that enters the reflecting member 86 from below is reflected to the outdoors from either the reflecting surfaces 86A or 86B depending on the angle of incidence.

[0100] Similarly, in the reflective member 88 shown in Figure 10 (B), reflective surfaces 88A extending along the longitudinal direction (X direction) of the balcony 12 and reflective surfaces 88B extending along the depth direction (Y direction) of the balcony 12 are arranged alternately in a stepped manner.

[0101] In this configuration, the reflecting surfaces 88A and 88B are connected in a stepped manner, forming a reflecting member 88 as a reflecting portion that is inclined so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12.

[0102] 10(B) , at least a part of the incident sound that enters the reflecting member 88 from the side is reflected to the outdoor side from the reflecting surfaces 88A and 88B. Also, the incident sound that enters the reflecting member 88 from the side is reflected to the outdoor side from either the reflecting surfaces 88A or 88B depending on the angle of incidence.

[0103] In this way, the "reflective portion that slopes 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, as long as the reflective member including the reflective surface is inclined. [Explanation of symbols]

[0104] 10. Building 12. Veranda 14 Glass window (window) 50A Reflective material 50B Reflective material 60A Reflective material 60B Reflective material 62A Reflective material 62B Reflective material 66 Louver 66A feather board 68 Louver 68A feather board 70 Louver 70A feather board 76 Louver 74 Feather 74A Reflector 80 Reflective material 80A reflective surface 82 Reflective material 82A reflective surface 86 Reflective material 86A reflective surface 86B Reflective surface 88 Reflective material 88A reflective surface 88B Reflective surface

Claims

1. 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.

2. A noise reduction structure as described in claim 1, further comprising a reflective portion provided on the ceiling surface of the balcony, sloping 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.

3. The reflecting portion is 2. The noise reduction structure according to claim 1, wherein the louvers are 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.

4. At least the reflective portion on the ceiling surface is a louver formed by a plurality of slats inclined from bottom to 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.

5. The noise reduction structure according to claim 1 , wherein the reflecting portion is formed in a stepped shape.

6. 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 shape.

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