Sound absorbing panels

Abstract

To provide a sound absorption panel capable of securing safety when replacing a sound absorption material from the inside of a scaffold.SOLUTION: A sound absorption panel 1 according to an embodiment is installed on the rear surface of an elevated structure 9, and has a sound absorption material 2 and a casing 3 that houses the sound absorption material 2. The casing 3 includes a rectangular-shaped front plate 4 that is directed downward, four side plates 5 rising from the front plate 4, a flange 6 formed at the upper end of the side plate 5, and a back plate 7 placed opposite the front plate 4 across the sound absorption material 2 and placed on the flange 6. The back plate 7 can be opened and closed in a state where the flange 6 is placed on a beam member 92 of the elevated structure 9.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sound absorbing panel. To Regarding. [Background technology]

[0002] Protective materials installed on the underside of girders of elevated structures may be required to function as scaffolding in order to inspect the condition of girders, etc. Patent documents 1 to 3 disclose techniques relating to protective materials with scaffolding functions that are installed on the underside of girders of elevated structures.

[0003] The bridge protection plate of Patent Document 1 is a bridge protection plate that is placed between bridge girders, and is made of aluminum extruded profiles with flat upper and lower surfaces and hollow portions. The connecting parts extending in the width direction are connected to each other with fixing bolts and shield nuts, which are fixing members, so that the upper surfaces of the connected extruded profiles are formed to be on the same plane.

[0004] In the sound absorbing system of Patent Document 2, small beams such as H-shaped steel beams are hung on the underside of an elevated road or the like and are installed approximately horizontally with a gap between them. A plurality of metal louvers are arranged approximately parallel to each other with a slight gap between them and are attached to the underside of the lower flange of the small beams with bolts. The sound absorbing material is placed on the metal louvers and its upper surface is kept at the same level as the upper surface of the upper flange of the small beam. A metal corrugated plate is laid on the upper surface of the upper flange of the small beam as a walkway material, and the intersection of the metal corrugated plate and the small beam is bolted.

[0005] The sound-absorbing panel of Patent Document 3 includes a front plate member including a front plate that serves as an exposed surface, and a back plate member including a back plate facing the front plate, and the front plate member and the back plate member each have a pair of side plates facing each other, and the pair of side plates of the front plate member are formed with inner hook portions that bend inwardly of the front plate or outer hook portions that bend outwardly, and the pair of side plates of the back plate member are formed with outer hook portions that correspond to the inner hook portions of the front plate member or inner hook portions that correspond to the outer hook portions. The side plates of the front plate member and the back plate member are overlapped with each other so that the inner hook portions and the outer hook portions engage with each other, and the front plate member is suspended and supported by the back plate member. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-205961 A [Patent Document 2] JP 2001-220716 A [Patent Document 3] JP 2016-69824 A Summary of the Invention [Problem to be solved by the invention]

[0007] By the way, the sound absorbing material housed in the sound absorbing panels installed on the backside of elevated structures such as expressways is made of fiber-based materials such as polyester, and is not permanent. For this reason, there is concern that the sound absorbing function will decrease due to deterioration of the sound absorbing material caused by exhaust gases and the like when the panels are installed for a long period of time. There is also concern that the sound absorbing function will decrease due to clogging of the front panel with the openings. Therefore, the sound absorbing material and front panel need to be inspected, repaired, and replaced periodically.

[0008] When inspecting sound-absorbing materials from the road side (outside the scaffolding), for example, a method of setting up a work platform on the road side is conceivable, but this requires traffic restrictions and the range of work is limited by the range of motion of the work platform's boom, which increases the labor and costs. Another method is to assemble a separate scaffolding for inspecting sound-absorbing materials, but assembling a separate scaffolding increases the labor and costs.

[0009] The technology disclosed in Patent Document 1 is merely a scaffolding panel and does not have a sound-absorbing function. For this reason, it is necessary to separately attach sound-absorbing material to the underside of the scaffolding panel. However, in order to replace the separately attached sound-absorbing material from inside the scaffolding, it is necessary to pull the panel itself into the scaffolding and then remove the front panel. This not only takes time to work, but also creates an opening where the panel is pulled in, which poses the risk of workers falling or tools dropping through this opening. Therefore, it is difficult to ensure safety when replacing sound-absorbing material from inside the scaffolding.

[0010] In the technology disclosed in Patent Document 2, it is necessary to remove the metal corrugated plate that serves as the scaffolding material in order to replace the sound-absorbing material from inside the scaffolding. However, once this metal plate is removed, the scaffolding function is lost, and there is a risk of falling or tripping if the part where the metal corrugated plate has been removed is accidentally stepped on. Therefore, it is difficult to ensure safety when replacing the sound-absorbing material from inside the scaffolding.

[0011] In the technology disclosed in Patent Document 3, the side panels of the front panel member and the back panel member are overlapped so that the inner hook portion and the outer hook portion engage with each other, so that the sound-absorbing panel cannot be pulled into the scaffolding in the first place, and the sound-absorbing material cannot be replaced from inside the scaffolding.

[0012] Therefore, the present invention has been devised in consideration of the above-mentioned problems, and an object of the present invention is to provide a sound-absorbing panel that can ensure safety when replacing sound-absorbing material from inside scaffolding. Le The purpose is to provide. [Means for solving the problem]

[0013] The sound-absorbing panel according to the present invention is a sound-absorbing panel to be installed on the rear surface of an elevated structure, and includes a sound-absorbing material and a casing that houses the sound-absorbing material, the casing having a rectangular front panel facing downward, four side panels rising from the front panel, flanges formed at the upper ends of the side panels, and a back panel that is disposed on the opposite side of the front panel with the sound-absorbing material in between and placed on the flanges, the back panel being openable and closable with the flanges placed on the girder members of the elevated structure. The rear plate is attached to the flange and placed on a receiving portion of the flange formed below the main body of the flange, and the upper surface of the rear plate is flush with the flange. It is characterized by the above. Effect of the Invention

[0015] According to the present invention, it is possible to ensure safety when replacing sound-absorbing material from within scaffolding. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing an elevated structure 9 to which a sound-absorbing panel 1 according to the first embodiment is attached. [Diagram 2] FIG. 2 is a perspective view showing the sound-absorbing panel according to the first embodiment. [Diagram 3] FIG. 3 is a view showing the sound-absorbing panel according to the first embodiment as viewed from the girder axis direction. [Figure 4] FIG. 4 is a view showing the sound-absorbing panel according to the first embodiment as viewed from the beam width direction. [Diagram 5] FIG. 5 is a diagram for explaining a method of installing the sound-absorbing panel according to the first embodiment, showing a state in which one first flange is placed on a lower beam flange of one beam material. [Figure 6] FIG. 6 is a diagram for explaining a method of installing the sound-absorbing panel according to the first embodiment, showing a state in which the other first flange is placed on the lower beam flange of the other beam material. [Figure 7] FIG. 7 is a diagram for explaining a method of installing the sound-absorbing panel according to the first embodiment, showing a state in which a pair of first flanges are fixed to lower beam flanges of a pair of beam members. [Figure 8]FIG. 8 is a diagram for explaining a method for replacing the sound-absorbing material according to the first embodiment, showing a state in which the back panel is opened. [Figure 9] FIG. 9 is a diagram for explaining the method of replacing sound-absorbing material in the first embodiment, where FIG. 9(a) is a diagram showing the state before the sound-absorbing material is removed, and FIG. 9(b) is a diagram showing the state after the sound-absorbing material has been removed. [Figure 10] FIG. 10 is a diagram for explaining the method of replacing sound-absorbing material in the first embodiment, where FIG. 10(a) is a diagram showing the state in which new sound-absorbing material is installed, and FIG. 10(b) is a diagram showing the state after rough sea sound-absorbing material has been installed. [Figure 11] FIG. 11 is a diagram for explaining the effect of the rib material of the sound-absorbing panel according to the first embodiment. [Figure 12] FIG. 12 is a view showing the sound-absorbing panel according to the second embodiment as viewed from the beam width direction. [Figure 13] FIG. 13 is a view showing the sound-absorbing panel according to the third embodiment as viewed from the beam width direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a sound-absorbing panel and a method for replacing a sound-absorbing material according to the present invention will be described in detail with reference to the drawings.

[0018] (First embodiment) The sound-absorbing panel 1 is installed on the back surface of an elevated structure 9, as shown in FIG. 1. The elevated structure 9 mainly includes an upper structure 91 on which vehicles and the like can pass, and a girder member 92 that supports the upper structure 91. The girder member 92 includes a girder body 93, a hanging member 94, and a beam member 95. The girder body 93 is formed with an H-shaped cross section using an I-beam or the like extending in the girder axial direction Y. A plurality of girder bodies 93 are provided in a girder width direction X perpendicular to the girder axial direction Y. The hanging member 94 is attached by sandwiching the side surface of the girder body 93. The beam member 95 is a beam member such as an H-shaped steel extending in the girder axial direction Y, and includes a beam upper flange 96, a beam lower flange 97, and a beam web 98 that connects the beam upper flange 96 and the beam lower flange 97. The beam member 95 is fixed by hanging the beam upper flange 96 to the hanging member 94 by a joining member such as a bolt. In the following embodiment, the sound-absorbing panel 1 is provided on a beam 95 of a girder member 92 in an elevated structure 9, but the sound-absorbing panel of the present invention may also be provided on a girder body 93 of a girder member 92 in an elevated structure 9.

[0019] As shown in FIG. 2, the sound-absorbing panel 1 includes a sound-absorbing material 2 and a casing 3.

[0020] The sound-absorbing material 2 is made of a fiber material such as polyester and has a predetermined sound-absorbing function. The sound-absorbing material 2 is divided into multiple pieces and housed in a casing 3. As shown in Fig. 4, for example, the sound-absorbing material 2 is divided into two sound-absorbing materials 2a and 2b in the girder axis direction Y. The divided sound-absorbing materials 2a and 2b are each formed into a plate shape or the like.

[0021] The casing 3 contains the sound absorbing material 2 and is made of a rigid material such as an aluminum alloy. The casing 3 has a front panel 4, side panels 5, a flange 6, and a rear panel .

[0022] The front plate 4 is disposed facing downward and formed in a rectangular shape. A plurality of punched holes 41 are formed in the front plate 4 to allow the sound absorbing material 2 to absorb noise from the road on the ground. A covering material 42 is fixed to one end of the front plate 4 in the girder width direction X. The covering material 42 is a plate material such as a steel plate, and is fixed to the front plate 4 so as to protrude from the first side panel 51.

[0023] The side panels 5 are formed to rise from the four sides of the front panel 4. The side panels 5 are composed of a pair of first side panels 51, 52 formed at both ends of the front panel 4 in the girder width direction X, and a pair of second side panels 53, 54 formed at both ends of the front panel 4 in the girder axis direction Y. The side panels 5 may be formed by bending the front panel 4, or may be formed by welding a steel plate separate from the front panel 4.

[0024] The first side panel 51 has a first rising portion 51a that rises approximately vertically from the front panel 4, a flat portion 51b that is formed parallel to the front panel 4 from the first rising portion 51a toward the first side panel 52, and a second rising portion 51c that rises approximately vertically from the flat portion 51b.

[0025] The first side panel 52 rises substantially perpendicularly from the front panel 4. The second side panels 53, 54 rise substantially perpendicularly from the front panel 4.

[0026] The flange 6 is formed on the upper end of the side plate 5. The flange 6 has first flanges 61, 62 formed on the upper ends of the first side plates 51, 52, and second flanges 63, 64 formed on the upper ends of the second side plates 53, .

[0027] 3, the first flanges 61, 62 extend from the side plate 5 toward the outside of the casing 3. The first flanges 61, 62 have through holes formed in the portions extending from the side plate 5 toward the outside of the casing 3 for attaching the fixing member 8. The fixing member 8 is composed of, for example, a bolt 81 and a nut 82.

[0028] 4, the second flanges 63, 64 extend from the side plate 5 toward both the inside and outside of the casing 3. A through hole for attaching a mounting member 72 is formed in the second flanges 63, 64 at a portion extending from the side plate 5 toward the outside of the casing 3. The mounting member 72 is composed of, for example, a bolt 73 and a nut 74. The nut 74 is fixed in advance to the lower surface of the second flanges 63, 64 by welding or the like.

[0029] The rear panel 7 is disposed on the opposite side of the front panel 4 with the sound-absorbing material 2 in between. The rear panel 7 is placed on the flange 6. The rear panel 7 has no punched holes. The upper surface of the rear panel 7 is formed flat. A rib material 71 is provided on the lower surface of the rear panel 7 by welding or the like. The rib material 71 is made of, for example, a steel plate. The rear panel 7 may be made of an aluminum extrusion material and may be molded integrally with the rib material 71.

[0030] Both ends of the rear plate 7 in the girder width direction X are placed on the first flanges 61, 62. Both ends of the rear plate 7 in the girder axis direction Y are placed on the second flanges 63, 64, and through holes for attaching mounting members 72 are formed. The rear plate 7 is attached to the second flanges 63, 64 by the mounting members 72. The rear plate 7 is attached to the second flanges 63, 64 from above in an openable and closable manner by attaching and detaching bolts 73 to nuts 74 fixed to the lower surfaces of the second flanges 63, 64.

[0031] Next, a method for installing the sound absorbing panel according to the first embodiment will be described.

[0032] In the method of installing the sound-absorbing panel, the sound-absorbing panel 1 is prepared as shown in Fig. 5. The sound-absorbing panel 1 is in a closed state with the back panel 7 attached in advance to the second flanges 63, 64 by the mounting member 72.

[0033] First, in the method of installing the sound-absorbing panel, the first flange 61 of the sound-absorbing panel 1 is placed on the beam under flange 97 of one of the beam materials 95. At this time, the first flange 61 is placed on the beam under flange 97 of one of the beam materials 95 so that the beam under flange 97 is inserted between the first flange 61 and the flat portion 51b of the first side panel 51.

[0034] Next, in the method of installing the sound-absorbing panel, as shown in FIG. 6, the first flange 62 of the sound-absorbing panel 1 is placed on the lower beam flange 97 of the other beam 95. At this time, the covering material 42 of the sound-absorbing panel 1 is positioned so as to straddle the front panel 4' of the adjacent sound-absorbing panel 1'. Therefore, when the sound-absorbing panel 1 is viewed from the road side (below), one beam 95 is covered by the covering material 42. Furthermore, the end of the front panel 4 of the sound-absorbing panel 1 is positioned so as to straddle the covering material 42" of the adjacent sound-absorbing panel 1". Therefore, when the sound-absorbing panel 1 is viewed from the road side (below), the other beam 95 is covered by the covering material 42".

[0035] Next, in the method of installing the sound-absorbing panel, as shown in Fig. 7, bolts 81 are screwed into nuts 82 that have been fixed in advance to the underside of beam bottom flange 97, and the first flanges 61, 62 are fixed to the beam bottom flange 97. The first flange 62 of the sound-absorbing panel 1 is placed on the beam bottom flange 97 of the other beam material 95. Note that fixing the first flanges 61, 62 to the beam bottom flange 97 with fixing members 8 is optional and may be omitted.

[0036] This completes the method for installing the sound-absorbing panel according to the first embodiment.

[0037] Next, a method for replacing the sound absorbing material according to the first embodiment will be described.

[0038] The method for replacing the sound-absorbing material starts with the first flanges 61, 62 of the sound-absorbing panel 1 being placed on the beam flange 97. The method for replacing the sound-absorbing material also starts with the back panel 7 being attached to the second flanges 63, 64 by the mounting members 72 in advance and in a closed state.

[0039] First, in the method of replacing the sound-absorbing material, as shown in Fig. 8, with the first flanges 61, 62 placed on the girder member 92 (beam lower flange 97) of the elevated structure 9, the bolts 73 are removed from the nuts 74 and the back panel 7 is opened. This results in the sound-absorbing material 2 housed in the casing 3 being exposed to the upper side as shown in Fig. 9(a).

[0040] Next, in the method for replacing the sound-absorbing material, the sound-absorbing material 2 housed in the casing 3 is removed. Here, since the second flanges 63, 64 are formed extending toward the inside of the casing 3, if the sound-absorbing material 2 is not divided in the girder axis direction Y, the sound-absorbing material 2 comes into contact with the second flanges 63, 64 when it is removed, making the removal work difficult. In this regard, the sound-absorbing material 2 housed in the casing 3 is divided into sound-absorbing materials 2a, 2b in the girder axis direction Y, as shown in FIG. 9(b). Therefore, by bending the divided sound-absorbing material 2a, it is possible to avoid contact with the second flanges 63, 64 when removing the sound-absorbing material 2. Therefore, it is possible to easily remove the sound-absorbing material 2. After removing the divided sound-absorbing material 2a, the divided sound-absorbing material 2b is removed. When the sound-absorbing material 2 is removed, the front panel 4 can be inspected from the upper surface side.

[0041] Next, in the method of replacing the sound-absorbing material, new sound-absorbing material 2 is installed in the location where the sound-absorbing material 2 was removed, and replaced with the new sound-absorbing material 2. When replacing with new sound-absorbing material 2, the divided new sound-absorbing material 2b is installed in the casing 3. Then, the divided new sound-absorbing material 2a is installed in the casing 3 while being curved. This makes it possible to avoid contact with the second flanges 63, 64 when installing the new sound-absorbing material 2. This makes it possible to easily perform the installation work of the new sound-absorbing material 2.

[0042] Next, in the method of replacing the sound-absorbing material, after replacing it with new sound-absorbing material 2, the back panel 7 is closed. When closing the back panel 7, the back panel 7 is placed on the second flanges 63, 64 and then attached to the second flanges 63, 64 by the attachment members 72.

[0043] This completes the method for replacing the sound-absorbing material according to the first embodiment.

[0044] According to this embodiment, the sound absorbing material 2 and the casing 3 that houses the sound absorbing material 2 are provided. The casing 3 has a rectangular front panel 4 facing downward, four side panels 5 rising from the front panel 4, a flange 6 formed at the upper end of the side panel 5, and a back panel 7 that is disposed on the opposite side of the front panel 4 with the sound absorbing material 2 sandwiched therebetween and placed on the flange 6. The back panel 7 can be opened and closed with the flange 6 placed on the girder member 92 of the elevated structure 9. As a result, when the sound absorbing material 2 is replaced, the front panel 4 is left on the back surface under the girder of the elevated structure 9. Therefore, the scaffolding function of the sound absorbing panel 1 when replacing the sound absorbing material 2 can be secured, and it is possible to prevent workers from falling or tools from dropping. Therefore, it is possible to ensure safety when replacing the sound absorbing material 2 from within the scaffolding.

[0045] Furthermore, according to this embodiment, when the sound absorbing material 2 is removed, inspection and repair (removal of clogging) of the punched holes 41 in the front panel 4 can be safely carried out from within the scaffolding.

[0046] According to this embodiment, the flange 6 can be fixed to the girder member 92 of the elevated structure 9. This allows the flange 6 and the girder member 92 to be firmly fixed together. This makes it possible to further strengthen the footing function of the sound-absorbing panel 1 even when the back panel 7 is opened or closed.

[0047] According to this embodiment, the sound absorbing material 2 is divided into a plurality of pieces and housed in the casing 3. This makes it possible to easily replace the sound absorbing material 2.

[0048] According to this embodiment, the upper surface of the back panel 7 is flat. This allows workers to walk on it and carts for carrying materials used for inspection and replacement to move more easily. This makes it easier to replace the sound-absorbing material 2.

[0049] According to this embodiment, the lower surface of the back panel 7 is provided with a rib material 71. This makes it possible to suppress bending of the back panel 7 when a worker walks on it.

[0050] Moreover, according to this embodiment, the lower surface of the rear panel 7 is provided with a rib material 71. As a result, as shown in Fig. 11, sound S incident from the front panel 4 can be reflected by the rib material 71 after being absorbed by the sound absorbing material 2. This increases the number of times the sound S is reflected inside the casing 3, enhancing the diffusion effect, and attenuating the sound S escaping to the outside of the front panel 4.

[0051] According to this embodiment, the first side panel 51 has a first rising portion 51a rising substantially vertically from the front panel 4, a flat portion 51b formed parallel to the front panel 4 from the first rising portion 51a toward the first side panel 52, and a second rising portion 51c rising substantially vertically from the flat portion 51b. This allows the casing 3 to be disposed also in the space below the beam member 92. Therefore, the sound absorbing material 2 can be accommodated in the casing 3, thereby improving the sound absorbing efficiency.

[0052] According to this embodiment, the front panel 4 is provided with a covering material 42 that protrudes further than the side panel 5. As a result, when one sound-absorbing panel 1 is placed on a beam member 92, the covering material 42 of the one sound-absorbing panel 1 is disposed so as to straddle the adjacent other sound-absorbing panel 1', and the beam member 92 is covered by the covering material 42. As a result, it is possible to ensure airtightness. In addition, since a sound-absorbing area can be ensured, it is possible to improve sound-absorbing efficiency.

[0053] Second embodiment In the sound-absorbing panel 1 according to the second embodiment, as shown in Fig. 12, a rib material 71 is provided on the underside of the back plate 7 by welding or the like. The rib material 71 is made of, for example, an angle material formed into an L-shape. The back plate 7 may be made of extruded aluminum and may be molded integrally with the rib material 71.

[0054] According to this embodiment, the lower surface of the rear panel 7 is provided with a rib material 71 having an L-shaped cross section. As a result, the sound S incident from the front panel 4 can be reflected by the rib material 71 having the L-shaped cross section after being absorbed by the sound absorbing material 2. This further increases the number of times the sound S is reflected inside the casing 3, enhancing the diffusion effect, and further attenuating the sound S escaping to the outside of the front panel 4.

[0055] Third embodiment In the sound-absorbing panel 1 according to the third embodiment, as shown in FIG. ,digit Both ends in the axial direction Y are placed on the second flanges 63, 64. One end of the back plate 7 in the girder axial direction Y is attached to the second flange 63 by a hinge portion 75. The back plate 7 is attached to the second flange 63 by the hinge portion 75 so that it can be opened and closed from above. The other end of the back plate 7 in the girder axial direction Y is placed on the second flange 64. This second flange 64 has a receiving portion 64a formed below the main body of the second flange 64, and the back plate 7 is placed on the receiving portion 64a. As a result, the upper surface of the back plate 7 is flush with the second flanges 63, 64.

[0056] According to this embodiment, the back panel 7 can be opened and closed by the hinge portion 75 with the flange 6 placed on the girder member 92 of the elevated structure 9. As a result, the lower surface of the back panel 7 is provided with a rib material 71 having an L-shaped cross section. As a result, when the sound-absorbing material 2 is replaced, the front panel 4 is left behind on the underside of the girder of the elevated structure 9. This ensures the scaffolding function of the sound-absorbing panel 1 when replacing the sound-absorbing material 2, and prevents workers from falling or tools from dropping. This makes it possible to ensure safety when replacing the sound-absorbing material 2 from within the scaffolding.

[0057] Furthermore, according to this embodiment, the back panel 7 can be opened and closed by the hinge portion 75. This makes it easier to open and close the back panel 7. The sound absorbing material 2 can be easily replaced.

[0058] Although some of the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. In addition, these embodiments can be implemented in appropriate combinations. Furthermore, the present invention can be implemented in various new forms in addition to the above-mentioned several embodiments. Therefore, each of the above-mentioned several embodiments can be variously omitted, replaced, and modified without departing from the gist of the present invention. Such new forms and modifications are included in the scope and gist of the present invention, and are included in the scope of the invention described in the claims and the equivalents of the invention described in the claims. [Explanation of symbols]

[0059] 1: Sound absorbing panel 2: Sound absorbing material 3: Casing 4: Front plate 41: Punching hole 42: Covering material 5: Side plate 51: 1st side plate 52: 1st side plate 53:Second side plate 54:Second side plate 6: Flange 61: First flange 62: First flange 63: Second flange 64: Second flange 7: Back plate 71: Rib material 72: Mounting material 73: Bolt 74: Nut 75: Hinge part 8: Fixing member 81: Bolt 82: Nut 9: Elevated structure 91:Superstructure section 92: Girder member 93: Beam body 94: Hanging material 95: Beam material 96: Beam flange 97: Beam flange 98: Beam web

Claims

1. A sound-absorbing panel to be installed on the rear surface of an elevated structure, A sound absorbing material and a casing that houses the sound absorbing material, The casing comprises: A rectangular front panel facing downward; Four side panels rising from the front panel; A flange formed on an upper end of the side panel; a back panel disposed on the opposite side of the front panel with the sound absorbing material therebetween and placed on the flange; The back panel can be opened and closed with the flange placed on a girder member of an elevated structure, The back plate is attached to the flange and placed on a receiving portion of the flange that is formed below a main body of the flange, The upper surface of the back plate is flush with the flange. A sound-absorbing panel that features:

2. The flange can be fixed to a girder member of an elevated structure.

2. The sound-absorbing panel according to claim 1 .

3. The sound absorbing material is divided into a plurality of pieces and housed in the casing.

3. The sound-absorbing panel according to claim 1 or 2,

4. The upper surface of the back panel is flat. The sound-absorbing panel according to any one of claims 1 to 3,

5. The lower surface of the back panel is provided with a rib material. The sound-absorbing panel according to any one of claims 1 to 3,

6. The back panel is attached to the flange by a hinge portion. The sound-absorbing panel according to any one of claims 1 to 5,

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