JP4986580B2 - Soundproof partition - Google Patents

Description

  The present invention relates to a soundproof partition that is used, for example, for partitioning rooms in a building, and that prevents the propagation of sound between rooms.

  Conventionally, for example, as a soundproof partition provided in a building, a soundproof curtain provided in a window formed in the building is known. This soundproof curtain is made of a fabric material having a higher surface density than a curtain normally used for light shielding. Thereby, since it is suppressed that air passes a soundproof curtain, a part of sound which propagates in the air reflects in a soundproof curtain. Therefore, it is suppressed that the sound in the building leaks to the outside through the window and the outdoor sound enters the building through the window.

In addition to this soundproof curtain, a soundproof curtain in which a plastic film is sandwiched between a pair of lace curtains has been proposed (see, for example, Patent Document 1). According to this soundproof curtain, especially when the plastic film vibrates due to the sound pressure received from the sound in the high sound range, the vibration can be absorbed by the cushioning action of each lace curtain, so that the high sound propagates through the soundproof curtain. Can be prevented.
Utility Model Registration No. 3073339

  However, a soundproof curtain made of a fabric material reflects a part of the sound and allows a part of the sound to pass therethrough. Therefore, the sound propagation cannot be sufficiently suppressed by the soundproof curtain.

  In addition, in a soundproof curtain in which a plastic film is sandwiched between a pair of lace curtains, each lace curtain itself does not have soundproofing performance, so if part of the sound propagates through the plastic film, It cannot be blocked or absorbed by the lace curtain. For this reason, also in this case, the propagation of sound cannot be sufficiently suppressed by the soundproof curtain.

  Accordingly, an object of the present invention is to provide a soundproof structure for a partition that can more reliably suppress sound propagation.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a soundproofing partition including a partition main body having a plate shape as a whole, and the partition main body constitutes one surface of the partition main body. A sound insulating member for blocking propagation of at least a part of the sound generated on the surface side, and a surface of the sound insulating member located on the other surface side of the partition body, and the partition of the sound insulating member through the sound insulating member And a sound absorbing member for absorbing sound propagated to the other surface of the main body.

  The invention according to claim 2 is the invention according to claim 1, wherein the sound insulation member is made of a cloth material having a predetermined surface density, and the sound absorption member is a cotton-like body made of a plurality of fibers intertwined with each other. It is characterized by that.

Before Symbol partition body has a pair of sound insulating members containing said sound insulating member, wherein a pair of the sound absorbing member including the sound absorbing member, wherein each of the sound insulating member, the one surface and the other surface of each of the partition body Are arranged at intervals in the plate thickness direction of the partition main body, and the respective sound absorbing members are respectively provided on surfaces of the respective sound insulating members facing each other.

On one of the sound insulating member even without low, along the surface of the sound absorbing member is protruded from the surface located opposite the surface formed outwardly of the partition body and the sound insulating member of the shielding sound member A plurality of convex portions with a height of 100 mm or more extending in the same direction are formed at intervals, and the width dimension of each convex portion gradually increases from the tip of each convex portion toward the sound insulation member. It is characterized by that.

Between before Symbol the sound absorbing member may be formed an air layer.

Before SL, characterized in that it includes the sound insulating member side surface opposite to the Hare covering a surface located on the side sheet member of the sound absorbing member.

Before Symbol sheet member may be I vinyl sheet Der.

Before SL sheet member may me air cap der air is sealed between two sheets of resin films.

  According to the first aspect of the present invention, since the partition main body includes a sound insulation member that blocks the propagation of at least a part of the sound generated on one surface side of the partition main body, the one surface side of the partition main body is provided. When a sound is generated in the sound insulation member, it is possible to prevent the sound insulation member from propagating at least a part of the sound to the other surface side of the partition main body. Thereby, like the conventional soundproof curtain which consists of a textile material, it is suppressed that the said sound leaks from the said one surface side of a partition main body to the said other surface side.

  Furthermore, since the sound absorbing member for absorbing the sound propagated to the other surface side of the partition body through the sound insulation member is provided on the surface located on the other surface side of the partition body of the sound insulation member, the partition Even when a part of the sound generated on the one surface side of the main body propagates to the other surface side of the partition main body without being blocked by the sound insulating member, the sound passing through the sound insulating member is absorbed by the sound absorbing member. Can do. Thereby, the propagation of sound can be more reliably suppressed as compared with a conventional soundproof curtain made of a single fabric material or a soundproof curtain in which a plastic film is sandwiched between a pair of lace curtains.

  According to the second aspect of the present invention, since the sound insulating member is made of a cloth material having a predetermined surface density, when the sound generated on the one surface side of the partition main body reaches the sound insulating member, The part is reflected by the sound insulation member according to the surface density of the sound insulation member, for example, and part of the sound propagates through the inside of the sound insulation member to the other surface side of the partition main body of the sound insulation member.

  The sound absorbing member has a porous structure because the sound absorbing member provided on the other surface of the partition body of the sound insulating member is a cotton-like body made of a plurality of fibers intertwined with each other. Thereby, when passing through the sound insulation member and entering the inside of the sound absorption member, the air between the fibers of the sound absorption member is directed toward the other surface of the partition main body of the sound absorption member by the sound pressure received from the sound. Is further pushed back inward by the air pressure received from the air present on the other surface side of the partition main body of the sound absorbing member. By repeating this, the air between the fibers of the sound absorbing member simply vibrates at the same frequency as the sound that has passed through the sound insulating member. This simple vibration causes friction between the air between the fibers and the fibers, and the sound energy is converted into thermal energy by the friction. Thereby, the sound of the frequency component which passed the sound insulation member is absorbed.

  Therefore, the sound insulation member and the sound absorbing member can reliably suppress the sound generated on the one surface side of the partition body from propagating toward the other surface side of the partition body.

  Further, since the sound insulation member is a cotton-like body composed of a plurality of fibers intertwined with each other, for example, when compared with the same size as a fabric material having a high surface density, the sound insulation member that is generally a cotton-like body The weight is lighter than the weight of the fabric material.

  Conventionally, in order to further improve the soundproofing property of a soundproof curtain made of, for example, a fabric material, it is conceivable to increase the thickness of the soundproof curtain. However, when the thickness of the soundproof curtain is increased, the weight of the entire soundproof curtain is increased, so that the mobility of the soundproof curtain is lowered.

  On the other hand, according to the present invention, since the sound absorbing member provided on the sound insulating member made of the fabric material is a cotton-like body, as described above, the weight of the sound insulating member is lighter than the weight of the fabric material. The weight of the entire partition body does not increase as much as when the thickness of the sound insulation member is simply increased as in the prior art. Thereby, the fall of the conventional mobility of the partition main body by the increase in a weight can be prevented reliably.

The partition body includes a pair of sound insulation members and a pair of sound absorption members, and each sound insulation member constitutes the one surface and the other surface of the partition body, and is spaced from each other in the thickness direction of the partition body. Since each sound absorbing member is provided on the surface of each sound insulating member facing each other, the sound insulating action of each sound insulating member and the sound absorbing action of each sound absorbing member cause the one of the partition main bodies to It is possible to reliably suppress the sound generated on each of the surface side and the other surface side from propagating between the one surface side and the other surface side of the partition main body.

Further , at least one of the sound insulating members protrudes outward from the surface of the partition body from the surface of the sound insulating member opposite to the surface on which the sound absorbing member is provided and extends in the same direction along the surface of the sound insulating member. A plurality of convex portions are formed at intervals from each other, and the width dimension of each convex portion is gradually increased from the tip of each convex portion toward the sound insulating member, for example, the one surface of the partition main body When the sound generated on the side reaches the one sound insulation member, a part of the sound is reflected on the side surfaces of the respective protrusions formed adjacent to each other, so that the one between the adjacent protrusions is Damping vibration toward the sound insulation member. As a result, most of the sound that has reached the sound insulation member and is blocked by the sound insulation member without being incident on the inside of the sound insulation member is attenuated by the projections without being reflected by the surface of the sound insulation member. Since it disappears due to the action, the occurrence of large reverberation on the one surface side of the partition main body due to the sound blocked by the sound insulating member being reflected by the sound insulating member is prevented. Therefore, it is possible to surely prevent unpleasantness caused by large reverberation.

Further , if an air layer is formed between the sound absorbing members, even if the sound is propagated from the sound insulating member side of each sound absorbing member to the opposite side through each sound absorbing member, the sound enters the air layer. When the air in the air layer is vibrated between the sound absorbing members due to the sound pressure received from the sound, the sound energy is converted into heat energy by the friction generated between the air and each sound absorbing member, and each sound absorbing member Since the sound of the frequency component that has passed through is absorbed, it is possible to more reliably suppress the sound that has passed through one of the sound absorbing members from entering the other sound absorbing member.

And since the sheet member covering the surface is provided on the surface of the sound absorbing member opposite to the surface on the sound insulating member side , the sound absorbing member side of the sound absorbing member passes through the one sound absorbing member. Even if the sound is propagated to the opposite side, when the sound hits the sheet member, so-called membrane vibration occurs at the same frequency as the frequency of the sound that the sheet member has passed through each sound absorbing member due to the sound pressure received from the sound, Since the membrane vibration of the sheet member is absorbed by the deformation of the one sound absorbing member, it is possible to more reliably suppress the sound that has passed through the one sound absorbing member from entering the other sound absorbing member.

Further , if the sheet member is a vinyl sheet, by providing a vinyl sheet on at least the surface of the one sound absorbing member, the sound that has passed through the one sound absorbing member is easily suppressed from entering the other sound absorbing member. be able to.

Furthermore, Der air cap sheet member is sealed air between two sheets of resin films lever, sound propagating on the opposite side from the sound insulating member side of said sound absorbing member and the through one of the sound absorbing member is in the air cap In addition to being able to block the sound by absorbing the membrane vibration generated in the entire air cap with the one sound absorbing member, the air enclosed between the two resin films of the air cap is removed from the sound. The received sound pressure vibrates between the two resin films at the same frequency as that of the sound, and this vibration causes friction between the air between the two resin films and each resin film. Converted into energy. Thereby, since the sound of the frequency component that has passed through the one sound absorbing member is absorbed, it is possible to more reliably suppress the sound that has passed through the one sound absorbing member from entering the other sound absorbing member.

  The present invention will be described with reference to the illustrated embodiments.

  FIG. 1 shows an example in which a soundproof partition 10 according to the present invention is applied to a partition for partitioning a dining room 12 and a living room 13 provided in a building 11.

  As shown in FIG. 1, the soundproof partition 10 according to the present invention includes a partition main body 14 disposed between the dining room 12 and the living room 13.

  As shown in FIG. 2, the partition main body 14 has a plate shape as a whole and includes a pair of frames 15.

  Each frame 15 has a pair of vertical frames 16 arranged so as to be spaced apart from each other and extending in the vertical direction of the building 11, and parallel to each vertical frame and spaced from each other and further spaced apart from each other. And a pair of middle frames 17 disposed between the vertical frames 16 and a pair of horizontal frames 18 respectively connecting the upper ends and the lower ends of the middle frames and the vertical frames 16 respectively. It has a rectangular shape. As shown in FIG. 3, each frame 15 has each vertical frame 16, each middle frame 17, and each horizontal frame 18 of one frame 15 aligned with each other and spaced from each other in the plate thickness direction of the partition main body 14. Arranged to be placed. The partition main body 14 is arranged so that each frame 15 crosses between the dining room 12 and the living room 13.

  As shown in FIGS. 2 and 3, the partition main body 14 includes a pair of sound insulating members 19 that are provided in each frame 15 and block the propagation of at least part of sound generated in the dining room 12 and the living room 13. .

Each sound insulating member 19 is made of a cloth material such as a carpet in the illustrated example. The surface density value of each sound insulating member 19 is set to 2.5 kg / m ² in the illustrated example, and the sound insulating rate value of each sound insulating member 19 is 0.7 or more in the illustrated example. Is set to One of the sound insulation members 19 is provided so as to cover the surface 15a facing the dining 12 of one frame 15 arranged on the dining 12 side. The other sound insulating member 19 is provided on the surface 15 a facing the living room 13 of the other frame 15 arranged on the living room 13 side. Thereby, each sound insulation member 19 comprises each surface of the plate-shaped partition main body 14, respectively.

  The surface 19a of the sound insulation member 19 facing the dining 12 and the living room 13 protrudes from the respective surface into the dining 12 and living room 13 and extends in the same direction along the surface 19a of the sound insulation member 19 respectively. The parts 20 are formed at intervals. In the example shown in the drawing, each sound insulation member 19 is formed so that its cross section is substantially corrugated, and each convex portion 20 is composed of a mountain constituting a wave, respectively. Stretch along the direction. Since each convex part 20 is constituted by each mountain constituting waves, the width dimension of each convex part 20 gradually increases from the tip 20a of each convex part toward the surface 19a of each sound insulating member 19. The pitch between the peaks constituting the wave, that is, the distance L (see FIG. 3) between the tips 20a of the convex portions 20 is set in the range of 50 to 1800 mm in the illustrated example. The height H (see FIG. 3), which is the protrusion amount, is set within a range of 1 to 300 mm.

  Furthermore, the partition main body 14 includes a pair of sound absorbing members 21 for absorbing sound transmitted from the dining room 12 and the living room 13 through the corresponding sound insulating members 19 to the opposite side of the sound insulating members.

In the example shown in FIG. 3, each sound absorbing member 21 is provided so as to fill each space in each space S defined by each vertical frame 16, each middle frame 17, and each horizontal frame 18 of each frame 15. It has been. Each sound absorbing member 21 is made of glass wool in the illustrated example. As is well known, glass wool is a cotton-like body formed by intertwining a plurality of glass fibers. In the illustrated example, the surface density of each sound absorbing member 21 is set within a range of 5 to ²⁰ kg / m ² , and the thickness dimension of each sound absorbing member 21 is set within a range of 10 to 30 mm. ing. When the surface density of each sound absorbing member 21 is 5 kg / m ² or less, or when the thickness dimension of each sound absorbing member 21 is 10 mm or less, the sound absorbing effect of each sound absorbing member 21 is reduced. When the surface density of the sound absorbing member 21 is 20 kg / m ² or more, or when the thickness dimension of each sound absorbing member 21 is 30 mm or more, the weight of each sound absorbing member 21 becomes excessively heavy, so that the partition main body 14 can be moved. In this embodiment, as described above, the surface density of each sound absorbing member 21 is set within the range of 5 to ²⁰ kg / m ² , and the thickness dimension of each sound absorbing member 21 is Since it is set within a range of 10 to 30 mm, a decrease in sound absorption effect and a decrease in the mobility of the partition main body 14 are prevented. Each sound absorbing member 21 is held in contact with each sound insulating member 19 by being sewn to each sound insulating member 19 with, for example, a thread (not shown).

  Since the intervals between the frames 15 filled with the sound absorbing members 21 are set as described above, an air layer K is formed between the sound absorbing members 21.

In the illustrated example, a sheet member that covers each back surface is provided on the back surface 15b located on the opposite side of the front surface 15a of each frame 15. In the illustrated example, each sheet member is composed of a vinyl sheet 23, and is fixed to each vertical frame 16, each middle frame 17, and each horizontal frame 18 by a fastener such as a nail (not shown). . The value of the surface density of each vinyl sheet 23 is set to 0.62 kg / m ² in the illustrated example. Since the back surface 15 b of each frame 15 is covered with each vinyl sheet 23, the opposite back surfaces 21 b of the sound absorbing members 21 filled in each frame 15 are covered with each vinyl sheet 23.

  For example, when sound is generated in the dining room 12, when the sound reaches the partition main body 14, a part of the sound hits each convex portion 20 formed on the one sound insulating member 19. At this time, as described above, the width dimension of each convex portion 20 gradually increases from the tip 20a of each convex portion 20 toward the surface 19a of each sound insulating member 19, and thus hits each convex portion 20. The sound is damped and oscillated between the adjacent convex portions 20 toward the one sound insulating member 19 by being reflected on the side surfaces 20b (see FIG. 3) of the convex portions 20 formed adjacent to each other. Disappear.

  Further, a part of the sound generated in the dining room 12 is not blocked by the sound insulation member 19 according to the surface density of the one sound insulation member 19 facing the dining 12, but the one sound insulation member 19 enters the inside of the sound insulation member 19 and exits from the sound insulation member 19 toward the one frame 15 through the sound insulation member.

  The sound that has passed through the one sound insulating member 19 enters one sound absorbing member 21 filled in the one frame 15 provided with the sound insulating member. Since each sound absorbing member 21 is a cotton-like body composed of a plurality of fibers intertwined with each other as described above, each sound absorbing member 21 has a porous structure. Accordingly, when sound enters the one sound absorbing member 21, the air between the fibers of the sound absorbing member is pushed into the inside of the one sound absorbing member 21 by the sound pressure received from the sound. The sound absorbing member 21 is pushed back inward by the air pressure received from the air present on the back surface 21 b side of the one sound absorbing member 21. By repeating this, the air between the fibers of the one sound absorbing member 21 vibrates at a frequency identical to the frequency of the sound that has passed through the one sound insulating member 19 between the fibers. This simple vibration causes friction between the air between the fibers and the fibers, and the sound energy is converted into thermal energy by the friction. Thereby, the sound of the frequency component that has passed through the one sound insulating member 19 is absorbed by the one sound absorbing member 21.

  When the sound that has passed through the one sound insulating member 19 cannot be completely absorbed by the one sound absorbing member 21 and the sound is propagated to the back surface 21b side of the sound absorbing member through the one sound absorbing member 21, As described above, since the vinyl sheet 23 that covers the back surface 21b of each sound absorbing member 21 is provided on the back surface 15b, the vinyl that has passed through the one sound absorbing member 21 covers the back surface 21b of the sound absorbing member. When the sheet hits the sheet 23, the vinyl sheet 23 vibrates at a frequency that is the same as the frequency of the sound that hit the vinyl sheet due to the sound pressure received from the sound. Since the membrane vibration of the vinyl sheet 23 is absorbed by the deformation of the one sound absorbing member 21, the sound hitting the vinyl sheet 23 is suppressed from propagating to the living sheet 13 side of the vinyl sheet.

  Furthermore, when the sound is not completely blocked by the vinyl sheet 23 and the sound propagates through the vinyl sheet 23 to the living room 13 side of the vinyl sheet, an air layer K is formed between the sound absorbing members 21, that is, between the vinyl sheets 23. Therefore, the sound that has passed through the vinyl sheet 23 enters the air layer K. When sound enters the air layer K, the air in the air layer K vibrates between the vinyl sheets 23 by the sound pressure received from the sound. Thereby, the energy of sound is converted into thermal energy by the friction generated between the air and each vinyl sheet 23, and the sound of the frequency component that has passed through each vinyl sheet 23 is absorbed. Thereby, it is suppressed that the sound which passed the vinyl sheet 23 propagates to the living room 13 side of this vinyl sheet.

  Thereby, it is suppressed that the sound generated in the dining room 12 is propagated in the living room 13.

  Even when sound is generated in the living room 13, the sound generated in the living room 13 is propagated into the dining room 12 by the sound insulating member 19, the sound absorbing member 21, the vinyl sheet 23 and the air layer K disposed on the living room 13 side. Can be suppressed in the same manner as described above.

  FIG. 4 shows the sound center frequency (unit: Hz) and the average sound pressure level (unit: dB) measured in the dining room 12 when sound is generated in the dining room 12. The relationship between the average sound pressure level value measured in the living room 13 and the value obtained by subtracting the average sound pressure level is the case where the respective projecting portions 20 according to the present embodiment are formed on the sound insulating members 19 (hereinafter referred to as case 1). When each convex part 20 according to this embodiment is formed on the one sound insulating member 19 (hereinafter referred to as case 2), the convex part 20 according to this embodiment is formed on any of the sound insulating members 19. It is a graph shown about each when each sound-insulation member 19 is each flat (henceforth Case 3) without being performed.

  The horizontal axis of FIG. 4 indicates the center frequency of the sound, and the vertical axis indicates the average sound pressure level difference between the dining room 12 and the living room 13. In FIG. 4, a change in the average sound pressure level difference in case 1 is indicated by a characteristic line 24, and a change in the average sound pressure level in case 2 is indicated by a characteristic line 25. The change in level is indicated by the characteristic line 26.

  When comparing the case 2 and the case 3 based on the graph shown in FIG. 4, the value of the average sound pressure level difference in the case 2 is larger than that in the case 3 in the middle to low frequency range of 250 Hz to 2 KHz. In the above high sound range, the value of the average sound pressure level difference in case 2 and that in case 3 are substantially equal to each other. From this, in the above-mentioned middle and low frequency range, the sound generated in the dining room 12 is more difficult to propagate in the living room 13 than in the case 3, and the sound from the dining room 12 to the living room 13 is generated in the above high frequency range. It can be seen that the difficulty of propagation is almost equal. That is, when the plurality of convex portions 20 are formed on the one sound insulating member 19, the sound insulation effect of the entire partition main body 14 is improved in the above-described middle and low sound range as compared with the case where both the sound insulating members 19 are flat.

  Furthermore, when comparing Case 1 and Case 2 based on the graph shown in FIG. 4, the value of the average sound pressure level difference in Case 1 is larger than that in Case 2 in the entire sound range. From this, it can be seen that the sound generated in the dining room 12 is less likely to propagate in the living room 13 than in the case 2 in the entire sound range. That is, when the plurality of convex portions 20 are formed on each of the sound insulating members 19, the soundproofing effect of the entire partition main body 14 is further improved in the whole sound range as compared with the case where each convex portion 20 is formed on the one sound insulating member 19. To do.

  Hereinafter, FIGS. 5 to 8 show the results of measuring the change in sound transmission loss when the height H and / or the interval L of each convex portion 20 is changed in the soundproof partition 10 according to the above-described embodiment. . As is well known in the art, the sound transmission loss is a difference in sound pressure level between the incident sound and the sound transmitted through the partition main body 14 and is inversely proportional to the transmittance of the partition main body 14.

  In the examples shown in FIGS. 5 to 8, the sound transmission loss is measured using the sound intensity method. As is well known in the art, the sound intensity method includes a partition main body 14 according to the present invention disposed between a reverberation room (not shown) and an anechoic room, and sound from a sound source disposed in the reverberation room is received. This is a method of measuring the sound pressure level in the anechoic chamber when passing through the partition main body 14.

  FIG. 5 shows the sound frequency (unit: Hz) and sound transmission loss (unit: dB) when the height H of each projection 20 is changed while the interval L between the projections 20 is constant. .).

  In the example shown in FIG. 5, when the height H of each convex portion 20 is 100 mm when the interval L between the convex portions 20 is fixed to 450 mm (hereinafter referred to as case 4), each convex portion 20. When the height H is 200 mm (hereinafter referred to as the case 5), and when each of the sound insulation members 19 is flat without the convex portion 20 being formed on any of the sound insulation members 19 (hereinafter referred to as the case 5). , Referred to as Case 6), the sound transmission loss was measured.

  The horizontal axis in FIG. 5 indicates the frequency of the sound, and the vertical axis indicates the sound transmission loss. In FIG. 5, a change in sound transmission loss in case 4 is shown by a characteristic line 27, a change in sound transmission loss in case 5 is shown by a characteristic line 28, and a change in sound transmission loss in case 6 is shown. A characteristic line 29 is shown.

  When comparing the case 4 and the case 5 based on the graph shown in FIG. 5, in the case 5 where the height H of each convex portion 20 is higher than that of the case 4, the sound transmission loss over almost the entire range of the measured frequency. The value of has increased. From this, it can be seen that the value of the sound transmission loss increases as the height H of each convex portion 20 is increased. That is, by increasing the height H of each convex portion 20, the sound of the sound source in the reverberation chamber becomes difficult to propagate into the anechoic chamber, and thus the soundproofing effect of the entire partition main body 14 is improved. This is because, as the height H of each convex portion 20 increases, the area of both side surfaces 20b (see FIG. 3) of each convex portion 20 increases, so that the sound hitting each convex portion 20 This is because the number of times of reflection on the side surface 20b of the portion 20 increases, so that sound can be more reliably attenuated toward the one sound insulating member 19 between the adjacent convex portions 20.

  Further, when comparing the case 4 and the case 5 with the case 6 on the basis of the graph shown in FIG. 5, the sound transmission loss value in the middle to low frequency range of 400 to 1 KHz is higher in the case 4 than in the case 6. In case 5, the value of sound transmission loss in the sound range of 400 Hz or higher is improved by about 4 dB at maximum compared to case 6. From this, when each convex part 20 is formed in each sound insulating member 19, the soundproofing effect of the partition main body 14 in a sound range of 400 Hz or more is improved as compared with the case where each convex part 20 is not formed on each sound insulating member 19. Can be made.

  In the measurement shown in FIG. 5, the area of each sound insulation member when the sound insulation member 19 is viewed in a plane does not increase or decrease in accordance with the change in the height H of each protrusion 20. The height H of each convex portion 20 is changed while keeping the area of the plane of each sound insulating member 19 constant so that the area of the surface 15a of each frame 15 becomes substantially equal even if H changes. For this reason, as the height H of each convex portion 20 is increased, the area of both side surfaces 20b (see FIG. 3) of each convex portion 20 increases, so that each area including the areas of both side surfaces 20b of each convex portion 20 is included. The total area of the sound insulation member 19 is increased. Generally, the sound insulation performance of each sound insulation member 19 improves as the total area of each sound insulation member 19 increases. Further, as described above, the sound insulation effect by each convex portion 20 improves as the height H of each convex portion 20 increases.

  Therefore, in the measurement shown in FIG. 5, in addition to the increase in the height H of each convex portion 20, the increase in the total area of each sound insulating member 19 contributes to the improvement of the soundproofing effect of the partition main body 14. Therefore, in order to investigate the sound transmission loss characteristic due to only the change in the height H of each projection 20 by changing the height H of each projection 20 while keeping the total area of each sound insulating member 19 constant, FIG. Area correction was applied to the measurement results shown.

  FIG. 6 is a graph showing the result of area correction performed on the measurement results shown in FIG.

  As shown in FIG. 6, in the case 4 in which the height H of each convex part 20 is 100 mm, the value of the sound transmission loss compared to the case 6 in which the convex part 20 is not formed on any sound insulation member 19. Is improved by 1 to 3 dB in a sound range of 400 Hz or higher. Further, in case 5 in which the height H of each convex portion 20 is 200 mm, the value of the sound transmission loss is improved by 4 to 6 dB in the sound range of 400 Hz or higher compared to case 6. From this, it can be seen that, regardless of the total area of each sound insulating member 19, the soundproofing effect of the entire partition body 14 improves as the height H of each convex portion 20 increases.

  FIG. 7 shows the sound frequency (unit is Hz) and sound transmission loss (unit is dB) when the height L of each convex portion 20 is kept constant and the interval L between the convex portions 20 is changed. .).

  In the example shown in FIG. 7, when the height H of each convex part 20 is fixed to 100 mm, when the distance L between the convex parts 20 is 300 mm (hereinafter referred to as case 7), each convex part 20 is used. Of the projections 20 are respectively 900 mm (hereinafter referred to as the case 9), and each of the case 6 described above. The sound transmission loss measurement was carried out.

  In FIG. 7, the change in sound transmission loss in case 7 is shown by a characteristic line 30, the change in sound transmission loss in case 8 is shown by a characteristic line 31, and the change in sound transmission loss in case 9 is shown. This is indicated by a characteristic line 32, and a change in sound transmission loss in the case 6 is indicated by a characteristic line 33.

  Comparing case 7, case 8, and case 9 based on the graph of FIG. 7, it can be seen that the sound transmission loss values in the cases 7, 8, and 9 are substantially equal in the high sound frequency range of 1600 Hz or higher. Further, in the middle sound range of 450 Hz to 1600 Hz, the value of the sound transmission loss decreases as the interval L between the convex portions 20 increases, and in the low sound region of 450 Hz or less, the interval L between the convex portions 20 increases. It can be seen that the value of sound transmission loss increases.

  That is, by increasing the interval L between the convex portions 20, it is difficult for the low-frequency sound among the sounds from the sound source in the reverberation chamber to propagate into the anechoic chamber. The soundproofing effect in the sound range can be improved. On the other hand, by reducing the interval L between the convex portions 20, it becomes difficult for the sound in the middle range among the sounds from the sound source in the reverberation chamber to propagate into the anechoic chamber. The soundproofing effect in the sound range can be improved.

  FIG. 8 shows the relationship between the sound frequency (unit: Hz) and sound transmission loss (unit: dB) when the height H and interval L of each convex portion 20 are changed. It is a graph to show.

  In the example shown in FIG. 8, when the height H of each convex portion 20 is 200 mm and the distance L is 450 mm (hereinafter referred to as case 10), the height H of each convex portion 20 is 150 mm. The sound transmission loss measurement was performed for each of the case intervals L of 300 mm (hereinafter referred to as case 11) and each of the case 6 described above.

  In FIG. 8, a change in sound transmission loss in case 10 is shown by a characteristic line 34, a change in sound transmission loss in case 11 is shown by a characteristic line 35, and a change in sound transmission loss in case 6 is shown. A characteristic line 36 is shown.

  In general, when sound enters the sound insulating material from one side, a coincidence effect is generated in which the sound insulating material resonates with sound at a predetermined frequency fc. For this reason, as shown in FIG. 9, the value of the sound transmission loss actually measured on the other side of the sound insulation material is obtained from a well-known mass law in which the sound transmission loss is defined by the weight of the sound insulation material. It is much smaller than the sound transmission loss value at the predetermined frequency fc. For this reason, the sound insulation performance of the sound insulation material at the frequency fc is lowered, and the sound at the frequency fc is easily propagated to the other side of the sound insulation material via the sound insulation material. The frequency fc at which the coincidence effect occurs, that is, the coincidence frequency fc can be obtained from the following equation.

fc = (c ² / 2λ) · (m / D) ^1/2 Equation (1)
In Equation (1), c is the speed of sound (m / s), λ is the wavelength of sound (m), m is the surface density (kg / m ² ) of the sound insulating material, and D is the sound insulating material. Of rigidity. As can be seen from the equation (1), the coincidence frequency fc varies depending on the rigidity of the sound insulating material, and decreases as the rigidity of the sound insulating material increases.

  It can be seen that such a coincidence effect occurs when the frequency fc1 is 800 Hz, as shown in FIG. 8, in the case 6 in which the projections 20 are not formed on the sound insulation members 19. For this reason, in the case 6, it becomes difficult for the sound in the sound range that is particularly harsh to be disturbed to be blocked by the partition main body 14, and accordingly, the sound that tends to be harsh is likely to propagate through the partition main body 14.

  On the other hand, in the case 10 and the case 11 in which each convex part 20 is formed, when a bending force that bends the partition main body acts on the partition main body 14, the bending force causes each convex part 20 to have the convex part. Since it acts as a compressive force for compressing in the longitudinal direction or a pulling force for pulling, the bending force can be received by each convex portion 20. Thereby, the rigidity of the partition main body 14 with respect to the external force in the case 10 and the case 11 is improved as compared with that in the case 6.

  Therefore, as shown in FIG. 8, the coincidence frequency fc2 in the case 10 is 200 Hz, the coincidence frequency fc3 in the case 11 is 315 Hz, and the rigidity of the partition main body 14 is higher than the rigidity of the partition main body 14 in the case 6. In case 10 and case 11, the coincidence frequency certainly moves to a lower sound range than that in case 6.

  Thereby, in the case 10 and the case 11, the sound insulation performance of the partition main body 14 in the sound range that becomes annoying as in the case 6 is not reduced, so that the sound in the disturbing sound range easily propagates through the partition main body 14. Can be reliably prevented. In the case 10 and the case 11, the sound insulation performance of the partition main body 14 in the low sound range is lowered. However, the low sound is less harsh than the high sound, so that the discomfort as much as in the case 6 is not caused.

  Further, when comparing the case 10 and the case 11 based on the graph shown in FIG. 8, the coincidence frequency fc2 in the case 10 in which the height H and the interval L of each protrusion 20 are larger than those in the case 11 is It is smaller than the coincidence frequency fc3 in case 11. That is, by increasing the height H and the interval L of each convex portion 20, it is possible to increase the rigidity of the entire partition main body 14, thereby moving the coincidence frequency fc to a low frequency band that is less likely to be annoying. Can do.

  From the measurement shown in FIG. 8, a formula fc = 450 * 100 / H representing the relationship between the coincidence frequency fc and the height H of each convex portion 20 was obtained. From this equation, it can be seen that in order to set the value of the coincidence frequency fc to, for example, 225 Hz, it is necessary to set the height H of each convex portion 20 to 200 mm.

FIG. 10 shows the relationship between the center frequency of the sound and the value of the average sound pressure level difference when the sound is generated in the dining room 12 when the partition main body 14 according to the present embodiment is used (hereinafter referred to as “the sound”). When the vinyl sheets 23 are removed from the partition main body 14 according to the present embodiment (hereinafter referred to as the case 13), the vinyl sheets 23 and the respective parts from the partition main body 14 according to the present embodiment are referred to as the case 12. It is a graph shown about each when the sound-absorbing member 21 is removed (hereinafter referred to as case 14) and when the partition main body 14 is made of a plaster board (not shown) (hereinafter referred to as case 15). The surface density of the gypsum board used in case 7 is set to 10 kg / m ² in the illustrated example.

  The horizontal axis of FIG. 10 shows the center frequency of the sound, and the vertical axis shows the average sound pressure level difference between the dining room 12 and the living room 13. In FIG. 10, a change in the average sound pressure level difference in the case 12 is indicated by a characteristic line 37, and a change in the average sound pressure level in the case 13 is indicated by a characteristic line 38. A change in level is indicated by a characteristic line 39, and a change in average sound pressure level in case 15 is indicated by a characteristic line 40.

  When the case 13 and the case 14 are compared with each other based on the graph shown in FIG. 10, the value of the average sound pressure level difference in the case 13 is larger than that in the case 14 in the entire sound range. From this, it can be seen that the sound generated in the dining room 12 is less likely to propagate in the living room 13 than in the case 14 in the entire sound range. That is, when the partition main body 14 is composed of each sound insulating member 19, each sound absorbing member 21 and the air layer K, each sound absorbing member 21 is compared with the case where the partition main body 14 is composed of each sound insulating member 19 and the air layer K. Therefore, the soundproofing effect of the entire partition main body 14 is improved in the whole sound range by the sound absorbing action of each sound absorbing member 21.

  Further, when comparing the case 12 and the case 13 based on the graph shown in FIG. 10, the value of the average sound pressure level difference in the case 12 is larger than that in the case 13 in the sound range of 250 Hz to 4 KHz, and 4 KHz. In the above high sound range, the average sound pressure level difference value in case 12 and that in case 13 are substantially equal to each other. Therefore, in the sound range of 250 Hz to 4 KHz, the sound generated in the dining room 12 is more difficult to propagate in the living room 13 than in the case 13, and in the high sound range of 4 KHz or higher, the sound from the dining room 12 to the living room 13 is transmitted. It can be seen that the difficulty of sound transmission is almost equal. That is, when the partition main body 14 is composed of each sound insulating member 19, each sound absorbing member 21, air layer K and each vinyl sheet 23, the partition main body 14 is composed of each sound insulating member 19, each sound absorbing member 21 and air layer K. Compared with the case where each vinyl sheet 23 is provided, the sound insulation effect of the partition main body 14 as a whole is further improved in a sound range of 250 Hz to 4 KHz by the sound insulation action of each vinyl sheet 23.

  Furthermore, when comparing the case 12 and the case 15 based on the graph shown in FIG. 10, the value of the average sound pressure level difference in the case 12 is smaller than that in the case 15 in the sound range of 250 to 500 Hz. In the above sound range, the value of the average sound pressure level difference in case 12 is larger than that in case 15. From this, in the sound range of 250 Hz to 500 Hz, the sound generated in the dining room 12 is more difficult to propagate in the living room 13 than in the case 12, and in the sound range of 500 Hz or higher, the case 12 is more than the case 15. It can also be seen that the sound generated in the dining room 12 is difficult to propagate in the living room 13. That is, when the partition main body 14 according to the present invention is used, the soundproofing effect of the entire partition main body 14 is improved in the majority of the region excluding the sound range of 500 Hz or less, compared to the case where the partition main body 14 is composed of gypsum board. .

  According to the present embodiment, the partition main body 14 for partitioning the dining room 12 and the living room 13 includes the pair of sound insulating members 19 that blocks the propagation of at least part of the sound generated in the dining room 12 and the living room 13. Thus, for example, when sound is generated in the dining room 12, it is possible to prevent each sound insulating member 19 from propagating at least a part of the sound into the living room 13. Thereby, it is suppressed that the said sound leaks in the living room 13 from the dining room 12 like the conventional soundproof curtain which consists of a fabric material.

  Further, as described above, since the sound absorbing members 21 for absorbing the sound that has passed through the respective sound insulating members 19 are provided on the mutually opposing surfaces of the respective sound insulating members 19, the sound generated in the dining room 12 is provided. Even when a part of the sound passes through the sound insulating member without being blocked by the one sound insulating member 19 located on the dining 19 side, the sound passing through the sound insulating member can be absorbed by the sound absorbing member 21. Thereby, the propagation of sound can be more reliably suppressed as compared with a conventional soundproof curtain made of a single fabric material or a soundproof curtain in which a plastic film is sandwiched between a pair of lace curtains.

  Furthermore, as described above, since each sound insulation member 21 is a cotton-like body composed of a plurality of fibers intertwined with each other, for example, when compared with the same size as a fabric material having a high surface density, The weight of the sound insulation member made of cotton is lighter than the weight of the fabric material.

  Conventionally, in order to further improve the soundproofing property of a soundproof curtain made of, for example, a fabric material, it is conceivable to increase the thickness of the soundproof curtain. However, when the thickness of the soundproof curtain is increased, the weight of the entire soundproof curtain is increased, so that the mobility of the soundproof curtain is lowered.

  On the other hand, according to the present embodiment, as described above, since each sound absorbing member 21 is a cotton-like body, the weight of the sound insulating member is lighter than the weight of the fabric material. The weight of the entire partition main body 14 does not increase as much as when the thickness is simply increased as in the prior art. Thereby, the fall of the conventional mobility of the partition main body 14 by the increase in a weight can be prevented reliably.

  Further, as described above, each sound insulation member 19 is formed so that the cross section thereof is substantially corrugated, whereby each sound insulation member 19 is composed of each wave crest and has a width dimension. Since a plurality of convex portions 20 that gradually increase from the tip 20a toward the surface 19a of each sound insulation member 19 are formed, for example, when sound generated in the dining room 12 reaches the one sound insulation member 19, the sound insulation member 19 Of the sound that reaches the member, most of the sound that is blocked by the sound insulating member without being incident on the inside of the sound insulating member is not reflected by the surface 19a of the sound insulating member, and is attenuated by each convex portion 20 Therefore, the occurrence of large reverberation in the dining room 13 due to the sound blocked by the sound insulating member 19 being reflected by the sound insulating member is prevented. Therefore, it is possible to surely prevent unpleasantness caused by large reverberation.

  Furthermore, as described above, since the air layer K is formed between the sound absorbing members 21, the sound is transmitted from the sound insulating member 19 side of each sound absorbing member 21 to the opposite side through each sound absorbing member 21. However, when the sound enters the air layer K, the sound of the frequency component that has passed through each sound absorbing member 21 is absorbed by the vibration of the air in the air layer K. Can be more reliably suppressed from entering the other sound absorbing member 21.

  Further, as described above, the vinyl sheet 23 covering the opposite back surfaces 21b of the respective sound absorbing members 21 filled in the respective frames 15 is provided on the back surface 15b located on the opposite side of the front surface 15a of each frame 15. For example, even if a sound generated in the dining room 12 passes through one of the sound absorbing members 21 located on the dining room 12 side, when the sound hits the vinyl sheet 23, the membrane vibration of the vinyl sheet 23 is caused. Is absorbed by the one sound absorbing member 21, it is possible to more reliably suppress the sound that has passed through the one sound absorbing member 21 from entering the other sound absorbing member 21.

  Further, as described above, since each sheet member is the vinyl sheet 23, for example, it is easy for sound generated in the dining room 12 and passing through the one sound absorbing member 21 to enter the other sound absorbing member 21. Can be suppressed.

  In this embodiment, an example in which each sheet member is composed of the vinyl sheet 23 has been shown, but instead, each sheet member is placed between two resin films 41, for example, as shown in FIG. It can be constituted by an air cap 42 enclosing air. As well known in the art, the air cap 42 is used as a packaging material for mitigating impact when a fragile object such as a glass product is transported.

  In the example shown in FIG. 11, each air cap 42 is formed with a plurality of spherical air sealing portions 43 arranged in alignment by partially bonding both resin films 41 to each other.

  According to the example shown in FIG. 11, for example, when a sound generated in the dining 12 passes through one sound absorbing member 21 arranged on the dining side and hits one air cap 42 located on the sound absorbing member side. In addition to being able to block the sound by absorbing the membrane vibration generated in the entire air cap by the one sound absorbing member 21, the air sealed in each air sealing portion 43 of the air cap 42 is The sound pressure received from the sound vibrates at the same frequency as that of the sound in each air enclosure 43, and this vibration causes friction between the air in each air enclosure 43 and each resin film 41. The energy of sound is converted into thermal energy by friction. Thereby, since the sound of the frequency component that has passed through the one sound absorbing member 21 is absorbed, it is possible to more reliably suppress the sound that has passed through the one sound absorbing member 21 from entering the other sound absorbing member 21. .

  Further, in the present embodiment, the example in which each sound absorbing member 21 is made of glass wool has been shown, but instead of this, a sound absorbing member made of a cotton-like body other than glass wool can be applied to the present invention.

  Furthermore, in the present embodiment, an example is shown in which each projection 20 is formed on each sound insulation member 19 so as to extend along the vertical direction of the building 11, but instead, for example, in the lateral direction of the building 11. Each protrusion 20 can be formed on each sound insulation member 19 so as to extend.

  Moreover, in the present Example, although the example which applied the soundproof partition 10 which concerns on this invention to the partition for partitioning between the dining 12 provided in the building 11 and the living room 13 was shown, it replaced with this and the dining 12 And in order to partition between rooms other than the living room 13, the soundproof partition 10 which concerns on this invention can be used.

  Furthermore, in the present embodiment, an example in which the soundproof partition 10 according to the present invention is applied to a partition for partitioning the rooms in the building 11 is shown, but instead of this, a curtain for covering, for example, a window of the building 11 The soundproof partition 10 according to the present invention can be applied.

It is a top view which shows roughly the example which applied the soundproof partition which concerns on this invention to the partition of the dining of a building, and the living room. 1 is a perspective view schematically showing a soundproof partition according to the present invention. FIG. 3 is a transverse sectional view taken along the line II in FIG. 2. It is a graph which shows the relationship between the center frequency of a sound, and the difference between rooms of the value of an average sound pressure level. It is a graph which shows the relationship between the sound transmission loss when changing the height of each convex part, and the frequency of sound. It is a graph which shows the result of having applied area correction to the measurement result shown in FIG. It is a graph which shows the relationship between the sound transmission loss when changing the space | interval of each convex part, and the frequency of a sound. It is a graph which shows the relationship between the sound transmission loss and frequency when changing the height and space | interval of each convex part. It is a graph which shows the relationship between the characteristic line of the sound transmission loss calculated | required by the mass law, and the characteristic line of the sound transmission loss by measurement. It is a graph which shows the relationship between the center frequency of a sound, and the difference between rooms of the value of an average sound pressure level. It is a cross-sectional view schematically showing another embodiment of the soundproof partition according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soundproof partition 14 Partition main body 19 Sound insulation member 20 Protruding part 21 Sound absorption member 23,42 Sheet member (vinyl sheet, air cap)
41 Resin film K Air layer

Claims (5)

A soundproofing partition including a partition main body formed in a plate shape as a whole, wherein the partition main body constitutes one surface thereof and blocks a propagation of at least a part of sound generated on the one surface side. And a sound absorbing member for absorbing sound propagated to the other surface side of the partition body of the sound insulation member through the sound insulation member and provided on a surface located on the other surface side of the partition body of the sound insulation member A member, and a sheet member that covers a surface of the sound absorbing member that is located on the opposite side of the sound insulating member side,
The partition main body includes a pair of sound insulating members including the sound insulating member and a pair of sound absorbing members including the sound absorbing member, and each of the sound insulating members includes the one surface and the other surface of the partition main body, respectively. Configured and arranged at intervals in the plate thickness direction of the partition main body, and the respective sound absorbing members are respectively provided on the mutually opposing surfaces of the respective sound insulating members,
At least one of the sound insulating members protrudes outward from the partition body from a surface of the sound insulating member opposite to the surface on which the sound absorbing member is provided, and is identical to the sound insulating member along the surface of the sound insulating member. A plurality of convex portions with a height of 100 mm or more extending in the direction are formed at intervals, and the width dimension of each convex portion is gradually increased from the tip of each convex portion toward the sound insulation member. Soundproofing partition, characterized in that there.   The soundproofing partition according to claim 1, wherein the sound insulating member is made of a cloth material having a predetermined surface density, and the sound absorbing member is a cotton-like body made of a plurality of fibers intertwined with each other. Soundproofing partition according to claim 1 or 2 wherein between each sound-absorbing element, characterized in that the air layer is formed. The soundproof partition according to any one of claims 1 to 3, wherein the sheet member is a vinyl sheet. The soundproof partition according to any one of claims 1 to 3, wherein the sheet member is an air cap in which air is sealed between two resin films.

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