JP5279414B2 - Sound insulating veranda structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound insulation veranda structure reflecting outdoor sounds incident to a ceiling face of a veranda from a main sound source in the vicinity of a building to reduce outdoor sounds propagated into a habitable room through a window. <P>SOLUTION: In the veranda structure installed on the outside of a building, a first reflection surface 10 for reflecting sounds in the outside 22 of the building is installed on the ceiling face 12 of the veranda, and the inclination angle &theta;a of the first reflection surface 10 to the propagation direction of the direct wave of the sounds is set at an angle of not smaller than 90&deg;. The direct wave of the sounds incident to the first reflection surface 10 is reflected toward the sound source or outdoor side. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veranda structure for maintaining the quietness of a room in a building such as an apartment house or an office building, and relates to a sound insulation veranda structure having a sound insulation performance against outdoor noise.

  In recent years, high-rise or super-high-rise apartment buildings and office buildings are being built near main roads and railways. This is due to the large-scale redevelopment around the station and the relocation of factories and warehouses that were previously located to the suburbs. This trend is expected to continue.

  Since main roads and railways are noise sources, noise can easily propagate from outside walls through window sashes, etc., to the interior of buildings located very close to main roads and railways. Difficult to keep. On the other hand, due to the growing awareness of the living environment and working environment, a high degree of calming is required in the living room and office space.

  As a conventional general measure for reducing or blocking such outdoor noise, a measure using a soundproof window such as a highly airtight sash or a double sash is adopted. However, there is a limit to the increase in sound insulation of such a window sash, and there is a problem that a heavy sash or a double sash is not convenient.

  When the building has a veranda, outdoor noise propagates from the window sash to the inside of the building through the veranda. Generally, a countermeasure is adopted in which the railing of the veranda is made of concrete or plate-like resin, and the noise directly propagating from the outdoor noise source to the window opening is shielded. However, as shown in FIGS. 8 and 9, noise propagating from the opening above the handrail and diffracted noise caused by sound waves wrapping around the upper end of the handrail are reflected from the ceiling surface of the veranda or diffusely reflected in the veranda. Therefore, a large noise reduction effect cannot be expected.

  Therefore, as a countermeasure against noise reflected on the veranda ceiling surface and entering the window opening, a structure in which the veranda ceiling surface is inclined to the outdoor side or a saw-shaped cross-section reflection is used to reflect noise on the ceiling surface to the outdoor side. The structure which attached the body to the ceiling surface is proposed (for example, refer patent document 1 and patent document 2). Moreover, the structure which reduces the noise reflected to a window opening by providing a sound-absorbing material in a veranda ceiling surface is known (for example, refer patent document 3 and patent document 4). In patent document 3, the structure which reduces the noise propagated from the outdoors by attaching a sound-absorbing material to the upper end of a veranda handrail is proposed.

JP 2004-162274 A JP 2006-265839 A JP 2003-41680 A JP 2002-332701 A “The Acoustical Society of Japan Road Traffic Noise Prediction Model“ ASJ RTN-Model 2003 ””, The Acoustical Society of Japan Road Traffic Noise Research Committee, Journal of the Acoustical Society of Japan, Vol. 60, No. 4, 2004

  By the way, as shown in FIGS. 8 and 9, the noise propagating from the outside to the inside of the veranda is directly transmitted through the opening above the veranda handrail from the noise source (direct wave) and the veranda handrail. It can be distinguished from noise (diffracted wave) diffracted and propagated at the upper end.

  In this case, in the structure provided with the reflector on the veranda ceiling surface of the above-mentioned conventional patent document 1 or the like, unless the noise due to the direct wave or the diffracted wave is reliably reflected outdoors, the inside of the veranda (ceiling surface, floor surface, handrail) The noise re-reflected on the inner surface of the veranda propagates into the living room through the window opening. In particular, since the diffracted sound wave propagates radially from the upper end of the veranda handrail, it is difficult to reliably reflect this radial sound wave outdoors with the reflector on the veranda ceiling surface of the above-mentioned conventional patent document 1 or the like.

  Moreover, in the structure using the sound absorbing material on the ceiling surface and the upper end of the handrail shown in the above-mentioned conventional Patent Document 3 and Patent Document 4, the sound absorbing performance of the sound absorbing material is scattered, the sound absorbing material is scattered, and the sound absorbing performance is deteriorated over time. There is a problem of deterioration, and maintenance work and costs are generated. Furthermore, the porous sound-absorbing material that is generally used has a frequency dependency of an effect that the sound-absorbing effect in a low frequency range is low.

  The present invention has been made in view of the above circumstances, and can more reliably reflect outdoor noise incident on a veranda ceiling surface from a main noise source in the vicinity of a building and propagate it from a window to a living room. An object of the present invention is to provide a sound-insulating veranda structure that can reduce outdoor noise.

In order to achieve the above object, a sound-insulating veranda structure according to claim 1 of the present invention is a veranda structure provided outside a building, the first reflecting surface for reflecting noise outside the building, and the veranda. A second reflecting surface that reflects the diffracted wave of the noise by the veranda handrail installed on the veranda ceiling surface, and the inclination angle of the first reflecting surface with respect to the direct wave propagation direction of the noise is 90 degrees or more The second reflecting surface is set in a circular arc shape having a concave arc shape in a side view and centering on an end portion of the veranda handrail .

The sound insulating veranda structure according to claim 2 of the present invention is a veranda structure provided outside a building, and includes a first reflecting surface that reflects noise outside the building, and a veranda handrail installed on the veranda. A second reflecting surface that reflects the diffracted wave of the noise is provided on the veranda ceiling surface, an inclination angle of the first reflecting surface with respect to a propagation direction of the direct wave of the noise is set to 90 degrees or more, and the second a reflective surface, characterized in that setting the point of a concave arc shape in side view the veranda handrail of the upper end and it more outdoor side elliptical arc to focus.

The sound insulating veranda structure according to claim 3 of the present invention is the above described claim 1 or 2, wherein the veranda handrail installed on the veranda is a plate-like sound insulating member extending to the outdoor side. It is characterized by having .

According to a fourth aspect of the present invention, there is provided the sound insulating veranda structure according to any one of the first to third aspects , wherein the first reflecting surface is provided on an outdoor side surface of the reflector, and the reflecting The inclination angle of the indoor side surface of the body is matched with the propagation direction of the direct wave of the noise .

  According to the present invention, the first reflecting surface that reflects noise outside the building is provided on the veranda ceiling surface, and the inclination angle of the first reflecting surface with respect to the propagation direction of the direct noise wave is set to 90 degrees or more. The direct wave of noise incident on the reflecting surface is reflected toward the noise source or outdoors. Thus, since the outdoor noise which injects into a veranda ceiling surface can be reflected more reliably to the outdoors, the outdoor noise which passes a veranda and propagates from a window to a living room can be reduced. Therefore, the quietness of the living room inside the building can be maintained. Moreover, this noise reduction effect can be realized while ensuring the ceiling height of the veranda and the view from the living room.

  In addition, since the sound absorbing material is not used in the present invention, the above effect can be obtained without requiring maintenance management for the sound absorbing material and the veranda. Furthermore, according to the present invention, by using a single sash for the window opening, it is possible to realize a sound insulation performance with respect to outdoor noise substantially equivalent to the case of using a double sash without applying the present invention. Thus, by not using the double sash, it is possible to improve the convenience of the window sash and the degree of design freedom.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments (Examples 1 to 5) of a sound insulating veranda structure according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 are side sectional views of a sound insulating veranda structure according to the present invention, and are diagrams schematically showing noise propagation from a road / railway (noise source). In the figure, the wavefront of the noise reflected from the veranda handrail, the ceiling surface, and the floor surface is omitted.

  As shown in FIG. 1, a sound insulating veranda structure 100 according to the present invention has a veranda ceiling surface 12, a floor surface 14, and a window opening 18 of a living room 16, and is formed in a substantially U shape in a side sectional view. ing. A plate-like veranda handrail 24 extending upward from the floor surface 14 is installed on the veranda outdoor 22 side. As shown in FIG. 8, the sound insulating veranda structure 100 is provided on each floor outside the high-rise building, and a road / railway that is a noise source passes diagonally below the building.

On the middle floor or high floor of the building, since it is far away from the noise source, the direct wave of noise can be regarded as a plane wave, and the incident angle θ of the direct wave to the veranda (angle formed with the horizontal line) is It is uniquely determined by the positional relationship with the noise source. Further, in an area where the noise source cannot be directly seen due to being hidden by the veranda handrail 24, the diffracted wave propagates radially into the veranda from the upper end 26 (diffraction point) of the veranda handrail.
When a road or railway is in the vicinity of a building, noise generated from the road or railway can be regarded as a main component of noise incident on the outer wall surface of the building.

Example 1
First, Example 1 will be described. FIG. 1 is a side sectional view showing the first embodiment.
As shown in FIG. 1, the sound insulating veranda structure 100 of Example 1 is provided with the reflector 1 arrange | positioned with respect to the ceiling surface 12 of the area | region where a noise directly injects from a noise source. The reflector 1 has a first reflecting surface 10 having an inclination angle θa of 90 degrees to 90 degrees or more with respect to the propagation direction of the direct wave of noise. The sound wave of noise incident on the reflector 1 is reflected by the first reflecting surface 10 and its propagation direction is reversed and proceeds in the direction of the noise source or outdoors, so that it does not enter the veranda. For this reason, the direct wave of noise is more reliably reflected outdoors.

(Example 2)
Next, Example 2 will be described. FIG. 2 is a side sectional view showing the second embodiment.
As shown in FIG. 2, the sound insulating veranda structure 200 according to the second embodiment includes the reflector 1 and the reflector 2 arranged with respect to the ceiling surface 12 in the region where the diffracted wave is incident. The reflector 2 has a concave arc-shaped second reflecting surface 20 having the diffraction point C (the veranda handrail upper end 26) as the center of the circle in a side sectional view. The reflection surface shape of the reflector 2 may be a shape that approximates an arc by combining straight lines. The reflector 2 is disposed closer to the living room 16 than the reflector 1, and the inclined surface 1a on the living room 16 side of the reflector 1 is connected to the reflector 2 in parallel with the direct wave propagation direction. The diffracted wave traveling from the handrail upper end 26 to the veranda ceiling surface 12 side is reliably reflected toward the center of the arc, that is, the diffraction point C by the concave arc-shaped second reflecting surface 20 of the reflector 2.

(Example 3)
Next, Example 3 will be described. FIG. 3 is a side sectional view showing the third embodiment.
As shown in FIG. 3, the sound insulating veranda structure 300 according to the third embodiment includes the reflector 1 and a sound insulating plate 3 as a sound insulating member extending substantially horizontally from the upper end 26 of the veranda handrail to the outdoor 22 side. In this case, since the area where the direct wave enters the veranda is narrowed by the sound insulating plate 3, the reflector 1 can be miniaturized.

Example 4
Next, Example 4 will be described. FIG. 4 is a side sectional view showing the fourth embodiment.
As shown in FIG. 4, the sound insulating veranda structure 400 of Example 4 includes a reflector 1, a reflector 2, and a sound insulating plate 3. In this case, since the end point on the outdoor 22 side of the sound insulating plate 3 is the diffraction point C, the second reflecting surface 20 of the reflector 2 is a concave circle in a side sectional view centering on the end point on the outdoor 22 side of the sound insulating plate 3. It becomes an arcuate curved surface.

(Example 5)
Next, Example 5 will be described. FIG. 5 is a side sectional view showing the fifth embodiment.
As shown in FIG. 5, the sound insulating veranda structure 500 of Example 5 includes a reflector 1, a reflector 2 that is divided into a plurality of portions in the depth direction of the veranda (left and right direction in FIG. 5), and a sound insulating plate 3. . The inclined surfaces 2a on the side of the living room 16 of the divided reflectors 2 are connected to each other so that the extended straight line passes through the center C of the arc. In this case, by reducing the size of the reflector 1 and the reflector 2, it is possible to secure the ceiling height of the veranda and the view from the living room while maintaining the noise reduction effect.

In the first to fifth embodiments, the reflector 1 and the reflector 2 may be made of any material as long as the reflector 1 and the reflector 2 have sufficient reflection performance with respect to noise to be reduced.
The reflector 2 is most effective when it has an arc centered at the upper end of the veranda handrail, but may have an elliptical arc shape with the upper end of the veranda handrail and one point on the outdoor side as a focal point. Moreover, the shape which approximated the said circular arc or elliptical arc which combined a straight line may be sufficient.

Next, the results of numerical analysis performed to verify the effect of the present invention will be described.
The analysis is performed by two-dimensional acoustic numerical analysis on the assumption that the verandas having the side cross sections of Examples 1 to 5 are infinitely connected, and the energy level of noise propagating from the opened window opening 18 into the living room 16 Asked. The incident angle θ of the direct wave was 60 degrees, and the inclination angle θa of the first reflecting surface 10 of the reflector 1 was 90 degrees.

  FIG. 6 is a frequency characteristic (1/3 octave band level) of the noise reduction effect of Examples 1 to 5 by numerical analysis, and a standard veranda (a veranda without the reflector 1, the reflector 2, and the sound insulating plate 3). It is the figure which showed the reduction amount of the noise energy level which propagates in the living room 16 with respect to).

  As shown in FIG. 6, the noise reduction effect is generally obtained at a frequency of 200 Hz or higher, and increases as the frequency increases.

  FIG. 7 is a diagram showing the noise reduction effect at the A characteristic sound pressure level when automobile noise is assumed as a noise source, and shows the reduction amount of the noise energy level propagating into the room with respect to the standard veranda. FIG. In FIG. 7, the A characteristic sound pressure level is weighted by the frequency characteristic of automobile noise based on the 1/3 octave band level based on the Acoustical Society road traffic noise prediction model shown in Non-Patent Document 1, and the A characteristic is corrected. Is obtained by energy synthesis.

  As shown in FIG. 7, the noise reduction effect by the reflector 1 of Examples 1 and 3 can be obtained about 7 dBA at the A characteristic sound pressure level. In the configuration in which the reflector 2 is combined with the reflector 1 of Examples 2, 4 and 5, the noise reduction effect can be obtained about 10 dBA at the A characteristic sound pressure level. According to the comparison between Examples 1 and 3 and the comparison between Examples 2 and 4, even if the sound insulating plate 3 is installed and the reflector 1 is downsized, the noise reduction effect is not substantially changed. According to the comparison between Examples 4 and 5, the noise reduction effect does not change substantially even if the reflector 2 is divided.

  As described above, according to the present invention, outdoor noise propagating from the veranda through the window opening to the inside of the building can be more reliably reduced. For example, compared with a standard veranda, the A characteristic sound pressure level is 7 to 10 dBA. Can be reduced. For this reason, it is possible to achieve a high level of noise reduction in the living room or office room. Moreover, this effect can be achieved while ensuring the ceiling height of the veranda and the view from the living room. Furthermore, since no sound absorbing material is used in the present invention, the above-described effects can be obtained without requiring maintenance work and costs for the sound absorbing material and the veranda.

  In addition, according to the present invention, even when a single sash is used for the window opening, it is possible to achieve a sound insulation performance with respect to outdoor noise that is almost the same as when a double sash is used without applying the present invention. . Thus, by not using the double sash, it is possible to improve the convenience of the window sash and the degree of design freedom.

It is a sectional side view of the sound insulation veranda structure of Example 1 which concerns on this invention. It is a sectional side view of the sound insulation veranda structure of Example 2 which concerns on this invention. It is a sectional side view of the sound insulation veranda structure of Example 3 which concerns on this invention. It is a sectional side view of the sound insulation veranda structure of Example 4 which concerns on this invention. It is a sectional side view of the sound insulation veranda structure of Example 5 which concerns on this invention. It is a frequency characteristic figure of the noise reduction effect of Examples 1-5 by a numerical analysis result. It is a figure which shows the noise reduction effect of the A characteristic sound pressure level of Examples 1-5 by the numerical analysis result. It is a sectional side view which shows the propagation condition of the noise which injects into the building outer wall surface from the noise source of the conventional building vicinity. It is a sectional side view which shows the propagation condition of the noise which injects into the conventional veranda, and is the elements on larger scale of FIG.

Explanation of symbols

1, 2 Reflector 3 Sound insulation plate (sound insulation member)
DESCRIPTION OF SYMBOLS 10 1st reflective surface 12 Ceiling surface 14 Floor surface 16 Living room 18 Window opening 20 2nd reflective surface 22 Outdoor 24 Veranda handrail 26 Upper end of veranda handrail 100,200,300,400,500 Sound insulation veranda structure

Claims (4)

A veranda structure provided outside the building, wherein the first reflecting surface that reflects noise outside the building and the second reflecting surface that reflects the diffracted wave of the noise by a veranda handrail installed on the veranda Provided on the veranda ceiling surface, the inclination angle of the first reflection surface with respect to the direct wave propagation direction of the noise is set to 90 degrees or more, and the second reflection surface has a concave arc shape in a side view and the veranda handrail A sound-insulating veranda structure characterized by being set in an arc shape centering on the end portion of the . A veranda structure provided outside the building, wherein the first reflecting surface that reflects noise outside the building and the second reflecting surface that reflects the diffracted wave of the noise by a veranda handrail installed on the veranda Provided on the veranda ceiling surface, the inclination angle of the first reflection surface with respect to the direct wave propagation direction of the noise is set to 90 degrees or more, and the second reflection surface has a concave arc shape in a side view and the veranda handrail A sound-insulating veranda structure characterized in that it is set in an elliptical arc shape with a focal point at one end on the upper end and the outdoor side . The soundproof veranda structure according to claim 1 or 2, wherein the veranda handrail installed on the veranda has a plate-like sound insulation member extending to the outdoor side . The first reflection surface is provided on an outdoor side surface of the reflector, and an inclination angle of the indoor side surface of the reflector is adjusted to a propagation direction of the direct wave of the noise. 4. The sound insulating veranda structure according to any one of 3 above.

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