JP7601683B2 - Sound absorbing panels - Google Patents

Description

The present invention relates to an acoustical panel .

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 technologies related to protective materials with scaffolding functions that are installed on the underside of girders of elevated structures.

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

In the sound absorption 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. Multiple metal louvers are arranged approximately parallel to each other with a small 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 top of 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.

The sound-absorbing panel of Patent Document 3 includes a front panel member including a front panel that serves as an exposed surface, and a rear panel member including a rear panel that faces the front panel. The front panel member and the rear panel member each have a pair of side panels that face each other, and the pair of side panels of the front panel member are formed with inner hook portions that bend inwardly of the front panel or outer hook portions that bend outwardly, and the pair of side panels of the rear panel member are formed with outer hook portions that correspond to the inner hook portions of the front panel member or inner hook portions that correspond to the outer hook portions. The side panels of the front panel member and the rear panel member are overlapped so that the inner hook portions and the outer hook portions engage with each other, and the front panel member is suspended and supported by the rear panel member.

JP 2014-205961 A JP 2001-220716 A JP 2016-69824 A

The sound-absorbing material housed in sound-absorbing panels installed on the underside of elevated structures such as expressways is made of fibrous materials such as polyester, and is not permanent. For this reason, there are concerns that the sound-absorbing function will decrease if the material is installed for a long period of time due to deterioration of the sound-absorbing material caused by exhaust gases, etc. There is also concern that the sound-absorbing function will decrease due to clogging of the front panel with the openings formed in it. Therefore, sound-absorbing materials and front panels need to be inspected, repaired, and replaced regularly.

When inspecting sound-absorbing materials from the road side (outside the scaffolding), one option would be to set up a work platform on the road side, but this would require traffic restrictions and would increase the labor and costs involved, as the work area would be limited by the range of motion of the work platform's boom. Another option would be to assemble separate scaffolding to inspect the sound-absorbing materials, but assembling separate scaffolding would increase the labor and costs involved.

The technology disclosed in Patent Document 1 is simply a scaffolding panel and does not have sound-absorbing capabilities. 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 retract the panel itself into the scaffolding and then remove the front panel. This not only makes the work time-consuming, but also creates an opening where the panel is retracted, 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.

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

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 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.

Therefore, the present invention has been devised in consideration of the above-mentioned problems, and its object is to provide a sound-absorbing panel that makes it possible to ensure safety when replacing sound-absorbing material from within scaffolding.

The sound-absorbing panel of the present invention is a sound-absorbing panel to be installed on the underside of an elevated structure, and comprises 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, a flange formed at the upper end of the side panels, and a rear panel that is positioned on the opposite side of the front panel across the sound-absorbing material and placed on the flange , the rear panel can be opened and closed while the flange is placed on a girder member of the elevated structure, the rear panel is attached to the flange and placed on a receiving portion of the flange that is formed below the main body of the flange, and the upper surface of the rear panel is flush with the flange .

The present invention makes it possible to ensure safety when replacing sound-absorbing material from inside scaffolding.

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. FIG. 2 is a perspective view showing the sound-absorbing panel according to the first embodiment. FIG. 3 is a view showing the sound-absorbing panel according to the first embodiment from the girder axis direction. FIG. 4 is a view showing the sound-absorbing panel according to the first embodiment from the girder width direction. 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. FIG. 6 is a diagram for explaining a method of installing the sound-absorbing panel according to the first embodiment, showing the state in which the other first flange is placed on the lower beam flange of the other beam material. 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. 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. 9A and 9B are diagrams for explaining the method of replacing the sound-absorbing material in the first embodiment, in which FIG. 9A is a diagram showing the state before the sound-absorbing material is removed, and FIG. 9B is a diagram showing the state after the sound-absorbing material has been removed. Figure 10 is a diagram for explaining the method of replacing sound-absorbing material in the first embodiment, where Figure 10(a) is a diagram showing the state in which new sound-absorbing material is installed, and Figure 10(b) is a diagram showing the state after rough sea sound-absorbing material has been installed. FIG. 11 is a diagram for explaining the effect of the rib material of the sound-absorbing panel according to the first embodiment. FIG. 12 is a view showing the sound-absorbing panel according to the second embodiment as viewed from the girder width direction. FIG. 13 is a view showing the sound-absorbing panel according to the third embodiment as viewed from the girder width direction.

Below, we will explain in detail the embodiment of the sound-absorbing panel and sound-absorbing material replacement method to which the present invention is applied, with reference to the drawings.

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.

As shown in FIG. 2, the sound-absorbing panel 1 comprises a sound-absorbing material 2 and a casing 3.

The sound-absorbing material 2 is made of a fibrous material such as polyester, and has a predetermined sound-absorbing function. The sound-absorbing material 2 is divided into several pieces and housed in the 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.

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, a side panel 5, a flange 6, and a back panel 7.

The front panel 4 is arranged facing downward and formed in a rectangular shape. The front panel 4 has multiple punched holes 41 formed therein 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 panel 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 panel 4 so as to protrude from the first side panel 51.

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.

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.

The first side panel 52 rises approximately vertically from the front panel 4. The second side panels 53 and 54 rise approximately vertically from the front panel 4.

The flange 6 is formed at the upper end of the side panel 5. The flange 6 has first flanges 61, 62 formed at the upper ends of the first side panels 51, 52, and second flanges 63, 64 formed at the upper ends of the second side panels 53, 54.

As shown in FIG. 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.

As shown in FIG. 4, the second flanges 63, 64 extend from the side plate 5 toward both the inside and outside of the casing 3. The second flanges 63, 64 have through holes formed in the portions extending from the side plate 5 toward the outside of the casing 3 for attaching the mounting member 72. 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 underside of the second flanges 63, 64 by welding or the like.

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 does not have any 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 extruded aluminum and molded integrally with the rib material 71.

The rear plate 7 is placed on the first flanges 61, 62 at both ends in the girder width direction X. The rear plate 7 is placed on the second flanges 63, 64 at both ends in the girder axis direction Y, and through holes are formed for attaching the mounting members 72. 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 so that it can be opened and closed by attaching and detaching the bolts 73 to the nuts 74 fixed to the undersides of the second flanges 63, 64.

Next, we will explain how to install the sound-absorbing panel in the first embodiment.

In the method of installing the sound-absorbing panel, the sound-absorbing panel 1 is prepared as shown in FIG. 5. The back panel 7 of the sound-absorbing panel 1 is already attached to the second flanges 63 and 64 by the mounting member 72 and is in a closed state.

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 members 95. At this time, the first flange 61 is placed on the beam under flange 97 of one of the beam members 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.

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 beam lower 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. In addition, 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".

Next, in the method of installing the sound-absorbing panel, as shown in FIG. 7, the bolt 81 is screwed into the nut 82 that is fixed in advance to the underside of the beam flange 97, and the first flanges 61, 62 are fixed to the beam flange 97. The first flange 62 of the sound-absorbing panel 1 is placed on the beam flange 97 of the other beam 95. Note that fixing the first flanges 61, 62 to the beam flange 97 with the fixing members 8 is optional and may be omitted.

This completes the installation method for the sound-absorbing panel according to the first embodiment.

Next, we will explain how to replace the sound-absorbing material in the first embodiment.

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

First, in the method of replacing the sound-absorbing material, as shown in Figure 8, the first flanges 61, 62 are placed on the girder member 92 (beam lower flange 97) of the elevated structure 9, and 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 Figure 9 (a).

Next, in the method of 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 top side.

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 install the new sound-absorbing material 2.

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 the back panel 7 is attached to the second flanges 63, 64 with the attachment members 72.

This completes the sound-absorbing material replacement method according to the first embodiment.

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 placed on the flange 6 and is disposed on the opposite side of the front panel 4 with the sound-absorbing material 2 in between. 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 of 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.

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

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.

According to this embodiment, the sound-absorbing material 2 is divided into multiple pieces and housed in the casing 3. This makes it easy to replace the sound-absorbing material 2.

In this embodiment, the top surface of the back panel 7 is flat. This allows workers to walk on it and carts to carry materials used during inspection and replacement to move more easily. This makes it easier to replace the sound-absorbing material 2.

According to this embodiment, the underside of the back panel 7 is provided with rib material 71. This makes it possible to suppress deflection of the back panel 7 when a worker walks on it, etc.

In addition, according to this embodiment, the underside of the rear panel 7 is provided with 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 sound S is reflected inside the casing 3, enhancing the diffusion effect, and attenuating sound S escaping to the outside of the front panel 4.

According to this embodiment, the first side panel 51 has a first rising portion 51a that rises substantially 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 substantially vertically from the flat portion 51b. As a result, the casing 3 is also disposed in the space below the beam member 92. Therefore, the sound absorbing material 2 can be housed in the casing 3, which makes it possible to improve sound absorption efficiency.

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 the beam member 92, the covering material 42 of one sound-absorbing panel 1 is arranged 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 the sound-absorbing area can be secured, it is possible to improve the sound-absorbing efficiency.

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 formed, for example, from an angle material formed into an L-shape. The back plate 7 may be made of an aluminum extrusion material and may be molded integrally with the rib material 71.

According to this embodiment, the underside of the rear panel 7 is provided with a rib material 71 with 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 with an 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.

Third Embodiment
In the sound-absorbing panel 1 according to the third embodiment, as shown in Fig. 13 , both ends of the back panel 7 in the girder axis direction Y are placed on the second flanges 63, 64. One end of the back panel 7 in the girder axis direction Y is attached to the second flange 63 by a hinge portion 75. The back panel 7 is attached to the second flange 63 by the hinge portion 75 so as to be openable and closable from above. The other end of the back panel 7 in the girder axis direction Y is placed on the second flange 64. The second flange 64 has a receiving portion 64a formed below the main body of the second flange 64, and the back panel 7 is placed on the receiving portion 64a. As a result, the upper surface of the back panel 7 is flush with the second flanges 63, 64.

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 underside of the back panel 7 is provided with a rib material 71 with 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 being dropped. This makes it possible to ensure safety when replacing the sound-absorbing material 2 from within the scaffolding.

In addition, 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. It also makes it easier to replace the sound-absorbing material 2.

Although several 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. These embodiments can be implemented in appropriate combinations. Furthermore, this 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, or modified without departing from the gist of this invention. Such new forms and modifications are included in the scope and gist of this invention, as well as in the invention described in the claims and the scope of equivalents of the invention described in the claims.

1: Sound-absorbing panel 2: Sound-absorbing material 3: Casing 4: Front panel 41: Punching hole 42: Covering material
Description of the Reference Number 5: Side panel 51: First side panel 52: First side panel 53: Second side panel 54: Second side panel 6: Flange 61: First flange 62: First flange 63: Second flange 64: Second flange 7: Back panel 71: Rib member 72: Mounting member 73: Bolt 74: Nut 75: Hinge portion 8: Fixing member 81: Bolt 82: Nut 9: Elevated structure 91: Superstructure 92: Girder member 93: Girder body 94: Suspension member 95: Beam member 96: Upper beam flange 97: Lower beam flange 98: Beam web

Claims (6)

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 sound-absorbing panel according to claim 1, wherein the upper surface of the back panel is flush with the flange . The sound-absorbing panel according to claim 1, wherein the flange can be fixed to a girder member of an elevated structure. 3. The sound-absorbing panel according to claim 1, wherein the sound-absorbing material is divided into a plurality of pieces and housed in the casing. The sound-absorbing panel according to any one of claims 1 to 3, wherein an upper surface of the back panel is a flat surface. The sound-absorbing panel according to any one of claims 1 to 3, wherein a lower surface of the back panel is provided with a rib material. The back plate 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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