Sound-absorbing panel and soundproof wall

Abstract

To provide a binding metal fitting that can shorten a construction time, can reduce noise in construction, and can sufficiently ensure a binding force.SOLUTION: A sound absorptive panel 1 according to an embodiment is a sound absorptive panel with a built-in support pillar, including: a sound absorption material 2; a casing 3 in which the sound absorption material 2 is stored; and a support pillar member 4 that fixes the casing 3 from a sound receiving side. The casing 3 is fixed to the support pillar member 4 with a fixing member provided on a pillar flange, and a pair of pillar webs are arranged to be flush with a pair of first reference surfaces flush with external surfaces of a pair of side plates.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sound-absorbing panel and a soundproof wall.

Background Art

[0002] Conventionally, as technologies related to sound-absorbing panels, the disclosed technologies of Patent Documents 1 to 3 have been proposed.

[0003] The soundproof wall disclosed in Patent Document 1 is composed of an FRP sound insulation panel and an attachment portion provided with a through hole for fixing that has a depth of 2 to 20% of the height of the sound insulation panel and can be attached to a building body. A sound-absorbing panel is installed on the noise source side of the FRP soundproof wall, and a reinforcing stiffener is attached to the side surface of the sound-absorbing panel.

[0004] The soundproof panel disclosed in Patent Document 2 is a soundproof wall panel installed by being attached between columns erected at regular intervals. A fall prevention fitting is attached to each soundproof wall panel by bolting at a rate of at least one per soundproof wall panel, and a fall prevention wire rope is passed through each wire rope through hole so as to sew each fall prevention fitting arranged in a vertical and horizontal connection arrangement in order.

[0005] The soundproof panel disclosed in Patent Document 3 is a soundproof panel attached to a wall surface erected at the edge of a vehicle running road. An upper engagement component and a lower engagement component having a cross-sectional groove shape attached to the vehicle running road side of the wall surface and extending horizontally along the wall surface, and a panel case that houses a sound-absorbing material inside and forms a large number of small holes on the front side, and an upper end is fitted to the upper engagement component and a lower end is fitted to the lower engagement component. It comprises a sound absorber formed by fitting.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] However, in the disclosed technology of Patent Document 1, the reinforcing stiffener is provided on the side of the sound-absorbing material. Since this reinforcing stiffener has no sound-absorbing surface, there is a possibility that multiple reflected sounds may occur between the vertically extending reinforcing stiffener and a vehicle such as a railway vehicle. Therefore, there is a problem that the sound absorption efficiency is low.

[0008] The disclosed technology of Patent Document 2 is not of the column-integrated type, but fixes adjacent panels via columns. For this reason, it is necessary to set up the columns after adjusting the column intervals according to the panel dimensions. Therefore, there is a problem that the constructability as a soundproof wall is low.

[0009] Further, the disclosed technology of Patent Document 3 is not of the column-integrated type, and the soundproof panel is attached to the wall surface of the in-situ concrete. For this reason, it is necessary to construct a concrete wall surface for attaching the soundproof panel. Therefore, there is a problem that the constructability as a soundproof wall is low.

[0010] Therefore, the present invention has been devised in view of the above-described problems, and an object thereof is to provide a sound-absorbing panel and a soundproof wall that can improve constructability and can improve sound absorption efficiency. [Means for Solving the Problems]

[0011] The sound-absorbing panel according to the present invention is a column-integrated sound-absorbing panel, comprising a sound-absorbing material, a casing for housing the sound-absorbing material, and a column member. The casing has a front panel that is arranged on the sound source side and has a plurality of punching holes formed therein, a back panel that is arranged on the sound receiving side relative to the front panel, and a pair of side plates that connect the front panel and the back panel. The column member has a pair of column flanges that face the back panel and are spaced apart from each other, a pair of column webs that extend from the pair of column flanges toward the sound receiving side respectively, and a column plate portion that connects the pair of column webs. The casing is fixed to the column member by a fixing member provided on the column flange, and the pair of column webs are flush with a pair of first reference planes that are flush with the outer surfaces of the pair of side plates, or are arranged in a region between the pair of first reference planes. , the back panel includes a first back panel formed along the front panel, a second back panel formed along the front panel and disposed on the sound receiving side relative to the first back panel, and a third back panel connecting the first back panel and the second back panel. Inside the casing, a first region on the sound source side relative to the first back panel and a second region on the sound receiving side relative to the first back panel are formed, and the sound absorbing material is accommodated in the first region and the second region It is characterized by the above.

[0012] The sound-absorbing panel according to the present invention is characterized in that a plurality of the sound-absorbing panels according to the present invention are arranged side by side without gaps.

Effects of the Invention

[0013] According to the present invention, it becomes possible to improve workability and to improve sound absorption efficiency.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

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Figure 8

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Figure 13

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Hereinafter, the embodiments for implementing the sound absorption panel and the sound insulation wall to which the present invention is applied will be described in detail with reference to the drawings.

[0016] (First Embodiment) FIG. 1 is a perspective view showing a soundproof wall using a sound-absorbing panel according to the first embodiment. FIG. 2 is an exploded perspective view showing the sound-absorbing panel according to the first embodiment. FIG. 3 is a cross-sectional view of the sound-absorbing panel according to the first embodiment taken along a plane perpendicular to the parallel arrangement direction, FIG. 3(a) is a cross-sectional view taken along a plane passing through the column flange, and FIG. 3(b) is a cross-sectional view taken along a plane passing through the second sound-absorbing material. FIG. 4(a) is a C-C cross-sectional view of FIG. 3(a), and FIG. 4(b) is a C-C cross-sectional view of FIG. 3(a). In FIG. 2, the punching holes are not shown.

[0017] The soundproof wall 100 is erected at the edge of a vehicle running path such as a railway or a road. The soundproof wall 100 is provided with a plurality of sound-absorbing panels 1 arranged without gaps. The plurality of sound-absorbing panels 1 are connected to each other by a connecting member 9. The direction in which the sound-absorbing panels 1 are arranged is defined as the parallel arrangement direction X, the direction perpendicular to the parallel arrangement direction X is defined as the depth direction Y, and the direction perpendicular to both the parallel arrangement direction X and the depth direction is defined as the vertical direction Z.

[0018] The sound-absorbing panel 1 is a sound-absorbing panel integrated with a support column. The sound-absorbing panel 1 includes a sound-absorbing material 2, a casing 3, and a support column member 4.

[0019] The sound-absorbing material 2 is composed of fibers such as glass wool or polyester and has a predetermined sound-absorbing function.

[0020] The casing 3 houses the sound-absorbing material 2. The casing 3 has a front plate 31, a back plate 33, a pair of side plates 32, and a top plate 39.

[0021] The front plate 31 is arranged on the sound source side and is a steel plate formed in a rectangular shape. The front plate 31 is formed with a plurality of punching holes for allowing the noise from the ground road to be absorbed by the sound-absorbing material 2, and serves as a sound-absorbing surface for absorbing the sound generated from vehicles and the like.

[0022] The side plate 32 connects the front plate 31 and the back plate 33 and is a steel plate formed in a rectangular shape.

[0023] The back panel 33 is a steel plate arranged on the sound receiving side rather than the front panel 31. The back panel 33 has a first back panel 33a formed along the front panel 31, a second back panel 33b formed along the front panel 31 and arranged on the sound receiving side rather than the first back panel 33a, and a third back panel 33c connecting the first back panel 33a and the second back panel 33b.

[0024] The first back panel 33a is formed from each of the pair of side plates 32 along the front panel 31. The third back panel 33c is formed from each of the pair of first back panels 33a toward the sound receiving side. The second back panel 33b connects the pair of third back panels 33c. A fixing member 36 composed of a bolt 37 and a nut 38 is provided on the first back panel 33a. The fixing member 36 penetrates the first back panel 33a and the column flange 41.

[0025] Inside the casing 3, a first region A1 on the sound source side rather than the first back panel 33a and a second region A2 on the sound receiving side rather than the first back panel 33a are formed. Sound absorbing materials 2 are accommodated in the first region A1 and the second region A2. A first sound absorbing material 21 is accommodated in the first region A1, and a second sound absorbing material 22 is accommodated in the second region A2. For example, the first sound absorbing material 21 and the second sound absorbing material 22 are made of different materials, and it is preferable that the unit volume weight of the first sound absorbing material 21 is smaller than the unit volume weight of the second sound absorbing material 22. Note that the first sound absorbing material 21 and the second sound absorbing material 22 may be made of the same material, and those having the same unit volume weight may be used.

[0026] Inside the casing 3, a reinforcing member 35 in contact with the front panel 31 and the back panel 33 is provided. The reinforcing member 35 has an upper reinforcing plate 35a arranged above the fixing member 36, a lower reinforcing plate 35b arranged below the fixing member 36, and a connecting reinforcing plate 35c connecting the upper reinforcing plate 35a and the lower reinforcing plate 35b. The reinforcing member 35 is formed in a U-shaped cross section, and for example, a C-shaped steel or the like is used. The reinforcing member 35 may be formed of an H-shaped steel having an H-shaped cross section.

[0027] The top plate 39 is provided at the upper end so as to cover the front panel 31, the back panel 33, and the pair of side plates 32.

[0028] The support member 4 fixes the casing 3 from the sound receiving side. A base plate 49 is provided at the lower end of the support member 4. The height of the support member 4 is higher than the height of the casing 3.

[0029] The support member 4 has a pair of column flanges 41 that face the back plate 33 and are spaced apart from each other, a pair of column webs 42 that extend from the pair of column flanges 41 toward the sound receiving side, and a column plate portion 43 that connects the pair of column webs 42.

[0030] A fixing member 36 composed of a bolt 37 and a nut 38 is provided on the column flange 41. The casing 3 is fixed to the support member 4 by the fixing member 36.

[0031] The outer surfaces of the pair of column webs 42 are arranged flush with a pair of first reference planes L that are flush with the outer surfaces of the pair of side plates 32. Note that the column web 42 may be arranged in the region between the pair of first reference planes L.

[0032] The connecting member 9 connects a column flange 41 disposed above the casing 3 in one sound absorption panel 1 and a column flange 41 disposed above the casing 3 in the other sound absorption panel 1 to each other. As the connecting member 9, an angle member or the like formed in an L-shaped cross section is used. The connecting member 9 is fixed to the column flange 41 by a fixing member 91 such as a bolt and nut.

[0033] According to the present embodiment, there are provided a sound absorbing material 2, a casing 3 that houses the sound absorbing material 2, and a support member 4 that fixes the casing 3 from the sound receiving side. The casing 3 has a front panel 31 disposed on the sound source side, a rear panel 33 disposed on the sound receiving side with respect to the front panel 31, and a pair of side plates 32 that connect the front panel 31 and the rear panel. The support member 4 has a pair of column flanges 41 that face the rear panel 33 and are spaced apart from each other, a pair of column webs 42 that extend from the pair of column flanges 41 toward the sound receiving side, and a column plate portion 43 that connects the pair of column webs 42. The casing 3 is fixed to the support member 4 by a fixing member 36 provided on the column flange 41, and the pair of column webs 42 are flush with a pair of first reference planes L flush with the outer surfaces of the pair of side plates 32 or are disposed in a region between the pair of first reference planes L.

[0034] As a result, as shown in FIG. 5, the sound source side is covered by the front panel 31 serving as a sound absorbing surface, and the support member 4 is not exposed from the side of the front panel 31. Therefore, the sound S1 generated when a vehicle such as a railway travels can be made to enter the inside of the casing 3 also from the vicinity of the end portion in the juxtaposition direction X of the front panel 31 and be absorbed by the sound absorbing material 2. As a result, it is possible to suppress the multiple reflection sound generated between the member having no sound absorbing function such as a conventional reinforcing stiffener and the vehicle, and it is possible to improve the sound absorbing efficiency.

[0035] Further, according to the present embodiment, since it is a sound absorbing panel 1 integrated with the support, it is not necessary to adjust the support interval according to the panel dimensions and attach the panel to the support. Therefore, it is possible to improve the workability.

[0036] According to the present embodiment, the rear panel has a first rear panel 33a formed along the front panel 31, a second rear panel 33b formed along the front panel 31 and disposed on the sound receiving side with respect to the first rear panel 33a, and a third rear panel 33c that connects the first rear panel 33a and the second rear panel 33b. Inside the casing 3, a first region A1 on the sound source side with respect to the first rear panel 33a and a second region A2 on the sound receiving side with respect to the first rear panel 33a are formed, and the sound absorbing material 2 is housed in the first region A1 and the second region A2.

[0037] Thus, as shown in FIG. 5, when the sound S2 generated when a vehicle such as a railway vehicle travels enters the inside of the casing 3 from the front panel 31, it can be absorbed by the sound-absorbing material 2 accommodated in the first region A1 and the second region A2. As a result, since it is possible to secure the member thickness in the depth direction Y of the sound-absorbing material 2 rather than having the sound-absorbing material 2 accommodated only in the first region A1, it becomes possible to improve the sound-absorbing efficiency.

[0038] According to the present embodiment, the first back panel 33a is formed from each of the pair of side plates 32 along the front panel 31, the third back panel 33c is formed from each of the pair of first back panels 33a toward the sound-receiving side, and the second back panel 33b connects the pair of third back panels 33c. As a result, the second sound-absorbing material 22 can be accommodated in the second region A2 formed at one location inside the casing 3. Therefore, it becomes possible to easily perform the accommodation work of the second sound-absorbing material 22.

[0039] According to the present embodiment, the sound-absorbing material 2 has a first sound-absorbing material 21 accommodated in the first region A1 and a second sound-absorbing material 22 accommodated in the second region A2, and the unit volume weight of the second sound-absorbing material 22 is larger than the unit volume weight of the first sound-absorbing material 21. As a result, it becomes possible to improve the sound-absorbing efficiency in the frequency band of about 800 Hz to 4000 Hz. Therefore, it is more preferably used as a sound-absorbing panel for railways.

[0040] According to the present embodiment, the fixing member 36 penetrates the back panel 33 and the column flange 41, and a reinforcing member 35 that contacts the front panel 31 and the back panel 33 is provided inside the casing 3. As a result, it becomes possible to improve the rigidity of the casing 3.

[0041] According to the present embodiment, the reinforcing member 35 is provided so as to cover the first sound-absorbing material 21. As a result, it is possible to suppress the sound-absorbing material 2 from getting wet due to rainwater or the like that has entered the inside of the casing 3. Therefore, it is possible to suppress a decrease in the sound-absorbing function of the sound-absorbing material 2.

[0042] According to this embodiment, the fixing member 36 is penetrated by the first back plate 33a and the column flange 41, and the head of the bolt 37 is disposed on the back plate 33. As a result, the head of the bolt 37 is not exposed to the front plate 31. Thereby, the building limit to the vehicle body side can be suppressed. Further, when the sound absorbing material 2 deteriorates over time, by removing the bolt 37, the casing 3 in which the sound absorbing material 2 is housed can be removed on site, and by following the reverse procedure, it is possible to replace it with a casing 3 in which a new sound absorbing material 2 is housed while holding the column member 4. For this reason, the sound absorbing material 2 can be easily replaced. In addition, since the column member 4 serving as a wall surface exists during the replacement work of the casing 3 in which the sound absorbing material 2 is housed, there is no risk of the operator falling, and the replacement work can be performed safely.

[0043] According to this embodiment, a plurality of sound absorbing panels 1 are arranged side by side without gaps. As a result, the sound source side is covered by the front plate 31 that becomes the sound absorbing surface, and the column member 4 is not exposed from the side of the front plate 31. For this reason, the sound S1 generated when a vehicle such as a railway travels can be made to enter the inside of the casing 3 also from the vicinity of the end portion in the juxtaposition direction X of the front plate 31 and be absorbed by the sound absorbing material 2. As a result, it is possible to suppress the multiple reflection sound generated between the member having no sound absorbing function such as a conventional reinforcing stiffener and the vehicle, and it is possible to improve the sound absorbing efficiency.

[0044] According to this embodiment, the height of the column member 4 is higher than the height of the casing 3, and further includes a connecting member 9 that connects the column flange 41 disposed above the casing 3 in one sound absorbing panel 1 and the column flange 41 disposed above the casing 3 in the other sound absorbing panel 1 to each other. Thereby, adjacent sound absorbing panels 1 are connected to each other, and the passage of the sound absorbing panel 1 can be adjusted.

[0045] (Second Embodiment) In the sound-absorbing panel 1 according to the second embodiment, as shown in FIG. 6, the fixing members 36 are provided at two locations, and reinforcing members 35 are provided above each of the fixing members 36. Further, the reinforcing member 35 is provided above the first sound-absorbing material 21. For this reason, the entire upper side of the first sound-absorbing material 21 is not covered by the reinforcing member 35. Note that FIG. 6(a) corresponds to the location of the 3A-3A cross-section of FIG. 3(a), and FIG. 6(b) corresponds to the location of the 3B-3B cross-section of FIG. 3(a).

[0046] According to the present embodiment, the fixing member 36 penetrates the back plate 33 and the column flange 41, and a reinforcing member 35 that contacts the front plate 31 and the back plate 33 is provided inside the casing 3. Thereby, it becomes possible to improve the rigidity of the casing 3.

[0047] (Third Embodiment) In the sound-absorbing panel 1 according to the third embodiment, as shown in FIG. 7, the fixing member 36 penetrates the front plate 31, the first back plate 33a, and the column flange 41. The head of the bolt 37 is exposed on the front plate 31. Note that FIG. 7(a) corresponds to the location of the 3A-3A cross-section of FIG. 3(a), and FIG. 7(b) corresponds to the location of the 3B-3B cross-section of FIG. 3(a).

[0048] Even at this time, the sound source side is covered by the front plate 31 that serves as the sound-absorbing surface, and the support member 4 is not exposed from the side of the front plate 31. For this reason, the sound S1 generated when a vehicle such as a railway travels can be made to enter the inside of the casing 3 even from the vicinity of the end in the juxtaposition direction X of the front plate 31, and can be absorbed by the sound-absorbing material 2. As a result, it is possible to suppress the multiple reflection sound generated between the member having no sound-absorbing function such as a conventional reinforcing stiffener and the vehicle, and it becomes possible to improve the sound-absorbing efficiency.

[0049] (Fourth Embodiment) In the sound-absorbing panel 1 according to the fourth embodiment, as shown in FIG. 8, the second back panel 33b is formed from a pair of side plates 32 along the front panel 31, respectively. The third back panel 33c is formed from a pair of second back panels 33b toward the sound source side, respectively. The first back panel 33a connects a pair of third back panels 33c. Note that FIG. 8(a) corresponds to the location of the 3A-3A cross section of FIG. 3(a), and FIG. 8(b) corresponds to the location of the 3B-3B cross section of FIG. 3(a).

[0050] The column flange 41 has a first column flange 41a facing the first back panel 33a, a second column flange 41b facing the second back panel 33b, and a third column flange 41c facing the third back panel 33c. A fixing member 36 is provided on the first column flange 41a.

[0051] According to this embodiment, the second back panel 33b is formed from a pair of side plates 32 along the front panel 31, respectively. The third back panel 33c is formed from a pair of second back panels 33b toward the sound source side, respectively. The first back panel 33a connects a pair of third back panels 33c. As a result, the second sound-absorbing material 22 can be accommodated in the second region A2 formed at two locations inside the casing 3. Therefore, it is possible to improve the sound absorption efficiency.

[0052] (Fifth Embodiment) In the sound-absorbing panel 1 according to the fifth embodiment, as shown in FIG. 9, the back panel 33 is a flat plate extending along the front panel 31. As a result, only the first region A1 is formed inside the casing 3. Note that FIG. 9(a) corresponds to the location of the 3A-3A cross section of FIG. 3(a), and FIG. 9(b) corresponds to the location of the 3B-3B cross section of FIG. 3(a).

[0053] Even at this time, the sound source side is covered by the front plate 31 that serves as a sound-absorbing surface, and the support member 4 is not exposed from the side of the front plate 31. Therefore, the sound S1 generated when a vehicle such as a railway travels can be made to enter the inside of the casing 3 from the vicinity of the end in the juxtaposition direction X of the front plate 31 and be absorbed by the sound-absorbing material 2. As a result, it is possible to suppress the multiple reflection sound generated between a member having no sound-absorbing function such as a conventional reinforcing stiffener and the vehicle, and it becomes possible to improve the sound-absorbing efficiency.

[0054] (Sixth Embodiment) In the sound-absorbing panel 1 according to the sixth embodiment, as shown in FIG. 10, as the sound-absorbing material 2, a second sound-absorbing material 22 and a third sound-absorbing material 23 are accommodated in the second region A2. Therefore, the sound-absorbing material 2 accommodated in the second region A2 is configured in a laminated structure by the second sound-absorbing material 22 and the third sound-absorbing material 23. The unit volume weight of the third sound-absorbing material 23 is larger than the unit volume weight of the first sound-absorbing material 21 and larger than the unit volume weight of the second sound-absorbing material 22.

[0055] In the sound-absorbing panel 1, as shown in FIG. 10, the third sound-absorbing material 23 is provided on the opposite side of the first sound-absorbing material 21 with the second sound-absorbing material 22 interposed therebetween. The unit volume weight of the second sound-absorbing material 22 is preferably larger than the unit volume weight of the first sound-absorbing material 21, but may be smaller than the unit volume weight of the first sound-absorbing material 21.

[0056] According to the present embodiment, the sound-absorbing material 2 includes a first sound-absorbing material 21 accommodated in the first region A1, a second sound-absorbing material 22 accommodated in the second region A2, and a third sound-absorbing material 23 that is accommodated in the second region A2 and is provided on the opposite side of the first sound-absorbing material 21 with the second sound-absorbing material 22 interposed therebetween. The unit volume weight of the third sound-absorbing material 23 is larger than the unit volume weight of the first sound-absorbing material 21 and larger than the unit volume weight of the second sound-absorbing material 22. As a result, the third sound-absorbing material 23 having the largest unit volume weight is accommodated on the most sound-receiving side inside the casing 3. Therefore, it is possible to obtain a high sound absorption rate in a wide frequency band.

Example

[0057] Specimens for Case 1 to Case 3 were prepared, and the normal incidence sound absorption coefficient was measured using an acoustic tube. The specimens were those for Case 1 to Case 3 with different thicknesses and unit volume weights of the sound-absorbing material. Case 1 used a polyester fiber sound-absorbing material with a unit volume weight of 24 kg / m 3 and a thickness of 50 mm. Case 2 used a polyester fiber sound-absorbing material with a unit volume weight of 24 kg / m 3 and a thickness of 70 mm. Case 3 used a laminated material of a polyester fiber sound-absorbing material with a unit volume weight of 24 kg / m 3 and a thickness of 50 mm and a polyester fiber sound-absorbing material with a unit volume weight of 80 kg / m 3 and a thickness of 20 mm. The total thickness of the sound-absorbing material in Case 3 is 70 mm, which is the same as that in Case 2. In Case 3, the sound-absorbing material with a unit volume weight of 24 kg / m 3 was arranged on the sound incident side, and adjacent to it, the sound-absorbing material with a unit volume weight of 80 kg / m 3 was arranged.

[0058] Figure 11 shows a diagram showing the measurement results of the normal incidence sound absorption coefficient in Example 1. In Figure 11, the vertical axis represents the normal incidence sound absorption coefficient, and the horizontal axis represents the 1 / 3 octave band center frequency (Hz).

[0059] As shown in Figure 11, in Case 2 and Case 3, the normal incidence sound absorption coefficient on the low-frequency side of about 400 to 1000 Hz was improved compared to that in Case 1. Thus, by increasing the thickness of the sound-absorbing material, it is possible to improve the sound absorption efficiency in the low-frequency band of about 400 to 1000 Hz.

[0060] Also, in Case 3, the normal incidence sound absorption coefficient on the high-frequency side of about 1000 Hz to 4000 Hz was improved compared to that in Case 2. Thus, even when the thickness of the sound-absorbing material is the same, by arranging a sound-absorbing material with a small unit volume weight on the sound incident side and arranging a sound-absorbing material with a larger unit volume weight adjacent to it, it is possible to improve the sound absorption efficiency in the high-frequency band of about 1000 Hz to 4000 Hz.

[0061] Here, in the case of roads, the frequency band of 400 Hz to 1000 Hz is dominant, and in the case of railways, the frequency band of 800 Hz to 4000 Hz is dominant. Therefore, for sound-absorbing panels for roads, it is effective to suppress the frequency band of 400 Hz to 1000 Hz, and in the case of railways, it is effective to suppress the frequency band of 800 Hz to 4000 Hz. In this regard, in Case 3, since it is possible to improve the sound absorption efficiency in the high-frequency band of 800 Hz to 4000 Hz, it is preferably used as a sound-absorbing panel for railways.

Example

[0062] Test specimens for Cases 4 to 6 were fabricated, and the reverberation room sound absorption rate was measured based on the "Method for Measuring Sound Absorption Rate by Reverberation Room Method of JIS A 1409". The test specimens used were those laminated with a polyester fiber sound-absorbing material having a unit volume weight of 24 kg / m 3 and a thickness of 50 mm, and a polyester fiber sound-absorbing material having a unit volume weight of 80 kg / m 3 and a thickness of 20 mm. In Case 4, a steel plate was provided so that 33% of the area of the sound-absorbing material was covered. In Case 5, a steel plate was provided so that 17% of the area of the sound-absorbing material was covered. In Case 6, all were made of sound-absorbing material without providing a steel plate. The steel plate covering the sound-absorbing material reflects sound and simulates a column surface. That is, in Cases 4 and 5, a sound-absorbing panel with a column surface having no sound-absorbing function exposed on the sound source side was assumed, and in Case 6, a sound-absorbing panel with no column surface on the sound source side and the entire sound source side of the sound-absorbing panel being a sound-absorbing surface was assumed.

[0063] Figure 12 shows a diagram showing the results of measuring the reverberation room sound absorption rate in Example 2. In Figure 11, the vertical axis represents the reverberation room sound absorption rate, and the horizontal axis represents the 1 / 3 octave band center frequency (Hz). Figure 12 shows the results of Cases 4 to 6.

[0064] As shown in Fig. 12, the reverberation room sound absorption rate of Case 6 was improved compared to those of Cases 4 and 5. From the above results, although the sound absorption efficiency is low due to the exposure of the column surface on the sound source side, it is considered that the sound absorption efficiency can be improved as the area of the column surface decreases.

Example

[0065] Based on Example 2, specimens of Comparative Example 1, Invention Example 1, and Invention Example 2 were fabricated, and a reverberation room test was conducted based on the "Method for Measuring Reverberation Room Sound Absorption Rate of JIS A 1409". The specimen used was a laminate of a polyester fiber sound absorption material with a unit volume weight of 24 kg / m 3 and a thickness of 50 mm, and a polyester fiber sound absorption material with a unit volume weight of 80 kg / m 3 and a thickness of 20 mm. Comparative Example 1 is the same as Case 4 of Example 2 described above. In Invention Examples 1 and 2, sound absorption materials were separately installed so that the steel plates installed in Case 4 were covered. That is, in Comparative Example 1, a sound absorption panel with an exposed column surface having no sound absorption function was assumed, and in Invention Examples 1 and 2, a sound absorption panel with no column surface and the entire sound source side of the sound absorption panel serving as a sound absorption surface was assumed. The sound absorption material replaced in Invention Example 1 is a polyester fiber sound absorption material with a unit volume weight of 24 kg / m 3 and a thickness of 20 mm. The sound absorption material replaced in Invention Example 2 is a polyester fiber sound absorption material with a unit volume weight of 24 kg / m 3 and a thickness of 50 mm.

[0066] Fig. 13 shows a diagram showing the results of measuring the reverberation room sound absorption rate in Example 3. In Fig. 13, the vertical axis represents the reverberation room sound absorption rate, and the horizontal axis represents the 1 / 3 octave band center frequency (Hz). Fig. 13 shows the results of Comparative Example 1, Invention Example 1, and 2.

[0067] As shown in Fig. 13, the reverberation room sound absorption rate of Examples 1 and 2 of the present invention was improved compared to that of Comparative Example 1. From the above results, in a sound absorption panel where there is no column surface on the sound source side and the entire sound source side of the sound absorption panel is a sound absorption surface, it is possible to improve the sound absorption efficiency. In particular, in Examples 1 and 2 of the present invention, since it is possible to improve the sound absorption efficiency in the high frequency band of 800 Hz to 4000 Hz, it is preferably used as a sound absorption panel for railways.

[0068] As described above, some embodiments of the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. Also, these embodiments can be implemented in appropriate combinations. Furthermore, the present invention can be implemented in various novel forms in addition to the above-described embodiments. Therefore, each of the above-described embodiments can be variously omitted, replaced, and changed without departing from the gist of the present invention. Such novel forms and modifications are included in the scope and gist of the present invention, and are also included in the scope of the invention described in the claims and the scope of equivalents of the invention described in the claims.

Explanation of Reference Numerals

[0069] 100: Sound insulation wall 1: Sound absorption panel 2: Sound absorption material 21: First sound absorption material 22: Second sound absorption material 23: Third sound absorption material 3: Casing A1: First region A2: Second region 31: Front plate 32: Side plate 33: Back plate 33a: First back plate 33b: Second back plate 33c: Third back plate 35: Reinforcing member 35a: Upper reinforcing plate 35b: Lower reinforcing plate 35c: Connecting reinforcing plate 36: Fixing member 37: Bolt 38: Nut 39: Top plate 4: Support member 41: Column flange 41a: First column flange 41b: Second column flange 41c: First column flange 42: Column web 43: Column plate part 49: Base plate 9: Connecting member 91: Fixing member L: First reference plane X: Arrangement direction Y: Depth direction

Claims

1. A sound-absorbing panel integrated with a support column, comprising: a sound-absorbing material; a casing for housing the sound-absorbing material; a support column member, wherein the casing includes: a front panel disposed on the sound source side and having a plurality of punching holes formed therein; a rear panel disposed on the sound receiving side with respect to the front panel; a pair of side panels connecting the front panel and the rear panel; wherein the support column member includes: a pair of column flanges facing the rear panel and spaced apart from each other; a pair of column webs extending from the pair of column flanges toward the sound receiving side respectively; a column plate portion connecting the pair of column webs; the casing is fixed to the support column member by a fixing member provided on the column flange; the pair of column webs are flush with a pair of first reference planes flush with the outer surfaces of the pair of side panels, or are disposed in a region between the pair of first reference planes; the rear panel includes: a first rear panel formed along the front panel; a second rear panel formed along the front panel and disposed on the sound receiving side with respect to the first rear panel; a third rear panel connecting the first rear panel and the second rear panel; inside the casing, a first region on the sound source side with respect to the first rear panel and a second region on the sound receiving side with respect to the first rear panel are formed; the sound-absorbing material is housed in the first region and the second region characterizing the sound-absorbing panel.

2. The first rear panel is formed from the pair of side panels along the front panel respectively; the third rear panel is formed from the pair of first rear panels toward the sound receiving side respectively; the second rear panel connects the pair of third rear panels characterizing the sound-absorbing panel according to Claim 1.

3. The second rear panel is formed from the pair of side panels along the front panel respectively; the third rear panel is formed from the pair of second rear panels toward the sound source side respectively; the first rear panel connects the pair of third rear panels characterizing the sound-absorbing panel according to Claim 1.

4. The sound-absorbing material includes a first sound-absorbing material housed in the first region and a second sound-absorbing material housed in the second region, wherein the unit volume weight of the second sound-absorbing material is greater than the unit volume weight of the first sound-absorbing material characterizing the sound-absorbing panel according to any one of Claims 1 to 3.

5. The sound-absorbing material includes a first sound-absorbing material housed in the first region, a second sound-absorbing material housed in the second region, and a third sound-absorbing material housed in the second region and provided on the opposite side of the first sound-absorbing material with the second sound-absorbing material interposed therebetween. The unit volume weight of the third sound-absorbing material is greater than the unit volume weight of the first sound-absorbing material and greater than the unit volume weight of the second sound-absorbing material. The sound-absorbing panel according to any one of claims 1 to 3, characterized in that.

6. The fixing member penetrates through the back panel and the column flange. Inside the casing, a reinforcing member that contacts the front panel and the back panel is provided. The sound-absorbing panel according to any one of claims 1 to 5, characterized in that.

7. The fixing member penetrates through the back panel and the column flange. Inside the casing, a reinforcing member that contacts the front panel and the back panel is provided. The reinforcing member has an upper reinforcing plate disposed above the fixing member. The reinforcing member is disposed so as to cover the upper side of the sound-absorbing material. The sound-absorbing panel according to any one of claims 1 to 6, characterized in that.

8. A plurality of the sound-absorbing panels according to any one of claims 1 to 7 are arranged side by side without gaps. The soundproof wall is characterized in that.

9. The height of the support member is higher than the height of the casing. The column flange disposed above the sound-absorbing panel of the support member in one of the sound-absorbing panels and the column flange disposed above the sound-absorbing panel of the support member in the other sound-absorbing panel further include a connecting member that connects them to each other. The soundproof wall according to claim 8, characterized in that.

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