Noise reduction structure

Abstract

To provide a noise reduction structure capable of reducing noise in both inside and outside of a building.SOLUTION: A noise reduction structure includes a sound absorption mechanism 20 that is provided in at least one of a ceiling surface and a side wall surface of a veranda 12 in a building 10 and absorbs noise from the outside. The sound absorption mechanism 20 includes: a reflection unit 32A that is inclined so as to expand from a window surface toward a tip end of the veranda 12 to reflect noise; and a sound absorption unit 32B that absorbs reflected sound reflected by the reflection unit 32A.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 the above-mentioned 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.

[0005] In consideration of the above, an object of the present invention is to provide a noise reduction structure that can reduce noise both inside and outside a building. [Means for solving the problem]

[0006] 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 comprising: a reflecting section that reflects the noise by sloping from the bottom to the top on the ceiling surface from the inside to the outside in the depth direction of the balcony, or by sloping from the inside to the outside in the longitudinal direction of the balcony on the side wall surface from the inside to the outside in the depth direction of the balcony; A sound absorbing section that absorbs the reflected sound reflected by the reflecting section; Equipped with The reflecting portion is formed on each of the plurality of blades. .

[0007] In the noise reduction structure of claim 1, a sound absorbing mechanism for absorbing noise is provided on at least one of the ceiling surface and the side wall surface of the balcony. This sound absorbing mechanism includes a reflecting section that reflects noise and is inclined relative 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 sound reflected by the reflecting section.

[0008] That is, 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.

[0009] In addition, the reflecting portion of the sound absorbing mechanism is inclined with respect to the ceiling or side wall so as to expand from the window surface toward the end of the balcony. Therefore, compared to a configuration in which the reflecting portion is parallel to the ceiling or side wall, it is easier to reduce noise from the direction closer to the front of the balcony. Also, it is less likely to obstruct the view from inside the room, and it is 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, wherein the sound absorbing mechanism is On the ceiling surface, from the inside to the outside in the depth direction of the balcony, from the bottom to the top Inclined Multiple The above Formed by a blade Or, on the side wall surface, 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 Inclined Multiple The above The sound absorbing unit is provided with louvers formed by slats, and the sound absorbing portion is disposed on the rear side of the slats or on the ceiling surface or side wall surface on which the sound absorbing mechanism is provided.

[0011] In the noise reduction structure of claim 2, the reflecting portion is formed on each of the plurality of blades, that is, the reflecting portion is formed in a divided manner.

[0012] For this reason, if each slat is arranged "in a tilted state" with respect to the ceiling or side wall, even if the slats are arranged "parallel to each other" with respect to the ceiling or side wall, a tilted reflecting section can be formed that spreads from the window surface toward the edge of the balcony. In this case, the sound absorbing mechanism can be made more space-saving than in a configuration where the slats are "diagonally arranged" with respect to the ceiling or side wall.

[0013] Alternatively, if the sound-absorbing mechanism is located on the ceiling surface of the balcony, by staggering the height positions of each slat, it is possible to form an inclined reflecting section that spreads out from the window surface towards the end of the balcony, regardless of whether each slat is inclined or not.

[0014] Furthermore, if the sound-absorbing mechanism is located on the side wall of the balcony, by staggering the horizontal positions of each slat, a reflective section can be formed that is inclined so as to extend from the window surface towards the end of the balcony, regardless of whether each slat is inclined or not.

[0015] The noise reduction structure of claim 3 is the noise reduction structure of claim 1, wherein the sound absorbing mechanism is On the ceiling surface, from the inside to the outside in the depth direction of the balcony, from the bottom to the top Multiple staggered placements The above The sound absorbing portion is provided with a louver formed by a blade. Inside the depth direction of the balcony It is located inside the ceiling nearby.

[0016] In the noise reduction mechanism of claim 3, the reflecting parts are formed on each of the plurality of 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 shifted in position so as to expand from the window surface toward the end of the balcony.

[0017] In addition, 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, and its sound absorbing performance is less likely to deteriorate.

[0018] A noise reduction structure according to a fourth aspect of the present invention is the noise reduction structure according to any one of the first to third aspects, in which the sound absorbing mechanisms are provided on both the ceiling surface and the side wall surfaces.

[0019] 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 a case where it is provided on only one of them, and therefore, the sound absorbing performance can be improved.

[0020] A noise reduction structure according to claim 5 is the noise reduction structure according to any one of claims 1 to 4, wherein the sound absorbing portion is formed of at least one of a punching metal and a porous material.

[0021] In the noise reduction structure of claim 5, the sound absorbing part is formed of at least one of punching metal and porous material. Therefore, even if the sound absorbing part is exposed to wind and rain, rainwater is less likely to accumulate and is easily drained, so the sound absorbing part is less likely to deteriorate. Effect of the Invention

[0022] The present invention provides noise reduction both inside and outside a building. [Brief description of the drawings]

[0023] [Figure 1] 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. [Diagram 2] (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. [Diagram 3] 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. [Figure 4]1A is a side cross-sectional view showing a noise reduction structure in which sound absorbing mechanisms are formed on the ceiling surface and side wall surfaces, and FIG. 1B is a cross-sectional view taken along line BB in FIG. [Diagram 5] 13 is a side cross-sectional view showing a modified example in which a sound absorbing portion is formed on the ceiling surface. FIG. [Figure 6] 1A is a side cross-sectional view showing a modified example in which a sound-absorbing part is formed on the ceiling surface and the blades are curved, and FIG. 1B is an enlarged view of the blades. [Figure 7] FIG. 11 is a side cross-sectional view showing a modified example of the arrangement of the blades. [Figure 8] 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. [Figure 9] 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. 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 a noise suppression means that is applied to a building 10 and aims to suppress noise both inside and outside the building 10.

[0028] 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.

[0029] Although detailed embodiments will be described later, the noise reduction structure 20 may be formed by only the sound absorbing mechanism 20A (see FIG. 1) or by only the sound absorbing mechanism 20B (see FIG. 3). Also, the noise reduction structure 20 may be formed by both the sound absorbing mechanisms 20A and 20B (see FIG. 4).

[0030] (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.

[0031] 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.

[0032] 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.

[0033] The slab 16 is a cantilevered slab that juts out 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. Note that, to simplify the illustration, the handrail 16A is omitted in Fig. 1(B). The same is true for the other floor plans.

[0034] <Examples of sound absorbing mechanisms> (Sound absorbing mechanism installed on the ceiling) 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, as an 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).

[0035] Louver 30A is formed by multiple slats 32. Slats 32 are long, flat members arranged so that their longitudinal direction coincides with the longitudinal direction (X direction) of balcony 12. As shown in Fig. 1(B) , slats 32 are arranged across between partitions 18 arranged on both sides of balcony 12 in the X direction.

[0036] As shown in FIG. 1(A), the slats 32 are arranged on the ceiling surface at an angle so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12.

[0037] Here, "from the window surface of the glass window 14 toward the end 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 incline so as to expand" refers to a state in which the balcony 12 is arranged with an incline from the bottom to the top in the vertical direction (Z direction) of the balcony 12.

[0038] In this embodiment, the slats 32 are shown arranged at an angle so that their lower ends are positioned inside the balcony 12 in the depth direction and their upper ends are positioned outside the balcony 12 in the depth direction.

[0039] The blades 32 are arranged in a line in the vertical direction (Z direction) with each blade inclined in this manner. Although three blades 32 are shown in Fig. 1(A), the number of blades 32 is not particularly limited as long as it is two or more.

[0040] The slat 32 includes 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 ahead), and the sound absorbing portion 32B is formed on the back side of the slat 32 (the surface facing the slab 16 above).

[0041] As shown by arrow N1 in FIG. 1(A), sound incident on louver 30A from below is partially reflected by reflecting portion 32A of slat 32, and a portion of the reflected sound is further incident on sound absorbing portion 32B and absorbed.

[0042] 2A is formed 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 the reflecting portion 32A.

[0043] On the other hand, the sound absorbing section 32B is formed, for example, by 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 by appropriate fixing means such as bolts or adhesive.

[0044] The sound absorbing portion 32B in the present invention may be a porous material 54 shown in Fig. 2(B). For example, foamed polypropylene having voids may be used as the porous material 54. Alternatively, urethane may be used as the porous material 54.

[0045] 2(C), the sound absorbing section 32B in the present invention can also be made by combining a punched metal 50 with 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.

[0046] The "sound absorbing" performance of the sound absorbing mechanism of the present invention means the performance of absorbing (deadening) at least a part of the incident sound. Incident sound that is not absorbed may be reflected to the outside.

[0047] In order to exert this sound absorbing performance, the sound absorbing mechanism has holes (through holes 52 in the punched metal 50 or air bubbles in the porous material 54) for absorbing incident sound.

[0048] (Sound absorbing mechanism installed on the side wall) 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, as an example. The "side wall surface" refers to the vicinity of the partition board 18 that separates the veranda 12 between adjacent dwelling units (the portion within approximately 50 cm from the partition board).

[0049] Louver 30B is formed by slats 32 similar to those of louver 30A provided in a sound absorbing mechanism provided on the ceiling surface. In louver 30B, slats 32 are arranged so that the longitudinal direction coincides with the vertical direction (Z direction) of balcony 12. In addition, slats 32 are arranged between upper and lower slabs 16.

[0050] The slats 32 are arranged on the side wall surface at an angle so as to widen from the window surface of the glass window 14 toward the tip of the balcony 12.

[0051] Here, "from the window surface of glass window 14 toward the end of balcony 12" refers to, as above, 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 partition board 18) in the longitudinal direction (X direction) of balcony 12.

[0052] In this embodiment, the slats 32 are inclined so that their inner ends are positioned inside the balcony 12 in the depth direction, and their outer ends are positioned outside the balcony 12 in the depth direction.

[0053] The slats 32 are arranged in a line in this inclined state along the depth direction (Y direction) of the balcony 12. Although three slats 32 are shown in Figures 3(A) and (B) , the number of slats 32 is not particularly limited as long as it is two or more.

[0054] As shown by arrow N2 in FIG. 3B, sound incident on louver 30B from the side is partially reflected by reflecting portion 32A of slat 32, and a portion of the reflected sound is further incident on sound absorbing portion 32B and absorbed.

[0055] 3(B) shows an example in which louvers 30B are arranged on both sides of 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 arranged on only one side of balcony 12. Also, louvers 30B do not need to be provided on the entire surface of partition board 18 in order to ensure an evacuation route, for example.

[0056] (Sound absorbing mechanism installed on the ceiling and side walls) 4(A) and (B) 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.

[0057] In this embodiment, the sound absorbing mechanisms are provided on both the ceiling and side walls, so that noise entering the balcony 12 from below and the sides can be absorbed more effectively than if they were provided on only one of them. This improves the sound absorbing performance.

[0058] <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.

[0059] (Example of sound absorbing part layout) As shown in Figures 1 and 3, in the above embodiment, sound absorbing section 32B is formed on the back surface of slats 32 constituting louvers 30A and 30B, but the embodiment of the present invention is not limited to this. For example, as in sound absorbing section 34B shown in Figure 5, the sound absorbing section may be provided on the ceiling surface (the underside of slab 16 in this embodiment).

[0060] The sound-absorbing section 34B is arranged so as to cover at least a portion of the underside of the slab 16, and similar to the sound-absorbing section 32B, can be formed from a punched metal 50, a porous material 54, or a composite material of the punched metal 50 and the porous material 54 (see FIG. 2).

[0061] When the sound absorbing portion is provided on the ceiling surface in this manner, the front and back surfaces of each of the blades 34A forming the louver 34 each constitute a reflecting portion. The blades 34A are made of the same material as the reflecting portion 32A (see FIG. 2).

[0062] In addition, the slats 34A may be arranged in a row along the vertical direction (Z direction) like the slats 32 (see Figure 1), but they may also be arranged in a row along the depth direction (Y direction) of the balcony 12, as in the example shown in Figure 5.

[0063] In this configuration, in which the blades 34A are used as the reflective part and the sound-absorbing part 34B is provided on the underside of the slab 16, as shown by arrow N3, incident sound that enters the louvers 34 from below is reflected by the blades 34A, which are the reflective part, and a portion of the reflected sound is further reflected multiple times before entering the sound-absorbing part 32B and being absorbed.

[0064] Note that, like slat 34C shown in Fig. 6(A), the slats that are the reflecting parts may be curved so as to be convex toward the outdoor side of balcony 12. By forming the slats in this manner, incident sound that enters louver 34 from below is more likely to be reflected upward, as shown by arrow N4 in Figs. 6(A) and (B). This makes it easier for the reflected sound to enter sound absorbing part 34B shown in Fig. 6(A).

[0065] In Fig. 6(B), arrow N5 shows an example of the direction in which sound is reflected from blade 34A when blade 34A is not curved and curved blade 34C are arranged with their lower ends aligned at the same height. Comparing arrows N5 and N4, arrow N4 is inclined upward. In other words, it is easier for the reflected sound to enter sound absorbing section 34B.

[0066] (Example 1 of louver slat arrangement) As shown in Fig. 1(A), 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 blades 34A shown in Fig. 5 and blades 34C shown in Fig. 6. However, the embodiment of the present invention is not limited to this.

[0067] For example, louver 36 may be arranged at an angle by arranging its lower end on the outdoor side (outside in the Y direction) and its upper end on the glass window 14 side (inside in the Y direction) like blades 36A, 36B, and 36C of louver 36 shown in Fig. 7. In this case, however, the lower end of the blade arranged on the outdoor side is arranged at a higher position than the lower end of the blade arranged on the glass window 14 side.

[0068] 7, blade 36A is disposed closer to the outdoors than blade 36B, which is disposed closer to the outdoors than blade 36C. The lower end of blade 36A is disposed higher than the lower end of blade 36B, which is disposed higher than the lower end of blade 36C.

[0069] Thus, "multiple slats inclined so as to widen from the window surface toward the end of the balcony" in the present invention includes configurations in which each "single slat" is inclined so as to widen from the window surface toward the end of the balcony, such as slat 32 shown in Fig. 1(A), slat 34A shown in Fig. 5, and slat 34C shown in Fig. 6. It also includes configurations in which "multiple slats" are arranged at an angle so as to widen from the window surface toward the end of the balcony, such as slats 36A, 36B, and 36C shown in Fig. 7.

[0070] In addition, the blades 36A, 36B, and 36C are formed as reflective portions, and as indicated by arrows N6 and N7, incident sound entering 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 portion 34B on the ceiling surface and absorbed.

[0071] (Example 2 of louver panel arrangement) The embodiment in which "multiple slats" are arranged at an angle so as to widen from the window surface toward the edge of the balcony, as explained with reference to FIG. 7, can also be formed as in louver 38 shown in FIG.

[0072] Louver 38 is formed by multiple horizontally arranged blades 38A. Blades 38A are arranged at staggered positions so as to expand from the window surface of glass window 14 (inner side of balcony 12 in the depth direction) toward the tip of balcony 12 (outer side of balcony 12 in the depth direction). Specifically, blades 38A arranged on the outer side of balcony 12 in the depth direction are arranged higher on balcony 12 than blades 38A arranged on the inner side.

[0073] The blades 38A of the louvers 38 are formed as reflective parts, and the sound absorbing parts 40 are disposed 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 top board 42 located below the slab 16 and above the glass window 14.

[0074] 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 lower surface of the slab 16, for example, inside the ceiling, as shown by the dashed line 40A in FIG.

[0075] 9, the eaves top board 42 may be provided with a through hole 42A penetrating 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.

[0076] Furthermore, 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 their in-plane directions are aligned with the vertical direction (Z direction) and the longitudinal direction of balcony 12 (X direction).

[0077] As indicated by arrow N8, sound incident on louver 38 from below is reflected by at least one of blades 38A, and a portion of the reflected sound is further incident on sound absorbing portion 40 and absorbed.

[0078] 8 and 9, by arranging the sound absorbing portion 40 inside the ceiling closer to the glass window 14 than the louvers 38, the sound absorbing portion 40 is less exposed to wind and rain. This makes it difficult for the sound absorbing performance to deteriorate.

[0079] <Action and Effects> 1, 3 and 4, in a noise reduction structure according to an embodiment of the present invention, a sound absorbing mechanism (sound absorbing mechanism 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 balcony 12. This sound absorbing mechanism includes a reflecting section (reflecting section 32A, slats 34A, 34C, 36A, 36B, 36C or 38A) that reflects noise and is inclined so as to widen from the window surface of glass window 14 toward the tip of balcony 12, and a sound absorbing section (sound absorbing section 32B, 34B, 40) that absorbs the sound reflected by the reflecting section.

[0080] That is, as shown in Figures 1 and 4, if sound-absorbing mechanism 20A is provided on the ceiling surface of balcony 12, noise from below can be reflected by reflecting section 32A and then absorbed by sound-absorbing section 32B. Also, as shown in Figures 3 and 4, if sound-absorbing mechanism 20B is provided on the side wall surface of balcony 12, noise from the side can be reflected by reflecting section 32A and then absorbed by sound-absorbing section 32B. This makes it possible to reduce noise both inside and outside building 10, compared to, for example, a structure in which only a reflecting section and no sound-absorbing section is provided on the ceiling surface of balcony 12.

[0081] In addition, the reflective portions (reflective portion 32A, slats 34A, 34C, 36A, 36B, 36C, or 38A) in the sound absorbing mechanisms 20A, 20B are inclined with respect to the ceiling surface or side wall 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 surface or side wall surface. Also, the view from the indoor space R is less likely to be obstructed, and the lighting into the indoor space R is less likely to be obstructed.

[0082] In the noise reduction structure according to the embodiment of the present invention, the reflecting portion (the reflecting portion 32A, the blades 34A, 34C, 36A, 36B, 36C, or 38A) is formed on each of the blades. That is, the reflecting portion is formed in a divided manner.

[0083] For this reason, if each slat is arranged "in a tilted state" with respect to the ceiling or side wall surface, for example, as in slat 32 shown in Fig. 3, slat 34A shown in Fig. 5, and slat 34C shown in Fig. 6, even if these slats are "arranged parallel to" the ceiling or side wall surface, because each of these slats is tilted, it is possible to form an inclined reflecting portion that spreads from the window surface of glass window 14 toward the end of balcony 12. In this case, the sound absorbing mechanism can be made more space-saving than in a configuration in which the slats are "arranged diagonally to" the ceiling or side wall surface.

[0084] 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.

[0085] Also, if the sound-absorbing mechanism is located on the side wall of the balcony 12, by staggering 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. [Explanation of symbols]

[0086] 10. Building 12. Veranda 20A Sound absorbing mechanism 20B Sound absorption mechanism 30A Louver 30B Louver 32 Feathers 32A Reflector 32B Sound absorption part 34 Louver 34A Feather plate (reflector) 34B Sound absorption part 34C feather plate (reflector) 36 Louver 36A Feather plate (reflector) 36B Feather plate (reflector) 36C feather plate (reflector) 38 Louver 38A Feather plate (reflector) 40 Sound absorbing section 50 Punching metal 52 Through hole 54 Porous materials

Claims

1. 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.

2. 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.

3. 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.

4. 4. The noise reduction structure according to claim 1, wherein the sound absorbing mechanism is provided on both the ceiling surface and the side wall surface.

5. 5. The noise reduction structure according to claim 1, wherein the sound absorbing portion is formed of at least one of a punching metal and a porous material.

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