How to install a retrofit sound absorbing device

Abstract

To provide a mounting method and a mounting structure for a retrofitted sound absorption device, which can be retrofitted to a soundproof wall to improve soundproofing performance inexpensively.SOLUTION: In a mounting method for a retrofitted sound absorption device in which a retrofitted sound absorption device 3 is added to an existing support-less soundproof wall 10, which is erected by directly fixing a soundproof panel 12 to a foundation structure (wall balustrade 11) without erecting the support, following steps are carried out: a horizontal member installation step in which a horizontal member 2 having a length equal to or greater than the width of several soundproof panels 12 is fixed over the multiple soundproof panels 12; and a retrofitted sound absorption device installation step in which the retrofitted sound absorption device 3 is fixed to the horizontal member 2.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a method for attaching a retrofit sound absorbing device to the tip of a pillar-less soundproof wall that has no pillars and is installed in parallel with a noise source such as a railway or highway, thereby improving the soundproofing performance. [Background technology]

[0002] In recent years, efforts have been made to increase the speed of the Shinkansen in order to shorten travel times and improve customer service. However, increasing the speed of the Shinkansen also increases the noise level when the train is running, and noise control measures are required. In addition, as residential development progresses along the Shinkansen lines and new houses are built, further noise control measures are required, and it is necessary to improve the performance of soundproofing walls.

[0003] On the other hand, the applicant developed a top diffraction type sound insulation wall described in Patent Document 1, in which a noise diffracting device having a noise attenuation effect by multiple diffraction is attached to the tip of the sound insulation wall (soundproof wall). The noise diffracting device 5 described in Patent Document 1 is composed of a back panel 9 attached between the supports 3, a horizontal panel 10 joined to the upper end of the back panel 9 and extending in a substantially horizontal direction toward the noise generation side, and an inclined panel 12 joined to the upper part of the back panel 9 via a joint panel 11 and extending obliquely upward toward the noise generation side, and a noise introduction section 13 is formed between the tip of the horizontal panel 10 and the upper end of the inclined panel 12 (see paragraphs

[0021] to

[0031] of the specification of Patent Document 1, and Figures 2 and 3 of the drawings, etc.). Therefore, by attaching the noise diffracting device 5 to the tip of the soundproof wall, it is possible to improve the soundproofing performance without changing the height of the soundproof wall.

[0004] Therefore, as mentioned above, when the current noise countermeasures are insufficient and there is a demand for improving the soundproofing performance of soundproofing walls, it is possible to consider adding a Y-shaped retrofit sound absorbing device having an attenuation effect by multiple diffraction, equivalent to the noise diffraction device 5 of Patent Document 1, to the tip of the existing soundproofing wall. If this can be achieved by adding such a retrofit sound absorbing device, it is possible to improve the soundproofing performance while keeping costs down, compared to replacing the existing soundproofing wall with a new soundproofing wall with higher soundproofing performance.

[0005] However, in recent years, the installation of so-called pillar-less soundproofing walls, which do not have pillars to fix the panels, has been increasing for the purpose of shortening the construction period and reducing the construction costs. For example, Patent Document 2 discloses a pillar-less soundproofing panel 1 which includes a housing 2, a plurality of reflecting plates 16 arranged at required intervals in the housing 2, and sound absorbing materials 4 arranged between the reflecting plates, and in which a reflecting plate assembly 3 is formed by integrating the plurality of reflecting plates 16, and the reflecting plate assembly 3 is fixed to the housing 2 (see claim 1 in the scope of claims of Patent Document 2, paragraphs

[0042] to

[0051] of the specification, and Figures 1 to 4 of the drawings, etc.).

[0006] When attempting to retrofit a horizontally long sound-absorbing device to the tip of such a pillar-less soundproof wall, the following problems arise.

[0007] Since the pillar-less soundproof wall has no supports and the soundproof panels are directly fixed and supported on the reinforced concrete structure that serves as the foundation, multiple vertically long panels are arranged in parallel in the direction of the tracks. For this reason, the horizontally long sound-absorbing device to be added later is installed across multiple vertically long soundproof panels of the pillar-less soundproof wall. In this case, there is a high possibility that the tips of the vertically long soundproof panels may have steps due to manufacturing errors or construction errors during installation, which makes it difficult to attach the horizontally long sound-absorbing device to be added later. Of course, it is also possible to divide the horizontally long sound-absorbing device to be added later into the layout of the vertically long soundproof panels of the pillar-less soundproof wall. However, in that case, it is clear that the number of connection points will increase, resulting in higher installation and manufacturing costs.

[0008] Furthermore, when installing a retrofit horizontal sound-absorbing device on a soundproof wall, there are no supports, so if the retrofit sound-absorbing device falls off, there is nowhere to attach a fall prevention wire to prevent it from falling or scattering.

[0009] On the other hand, as an example of a retrofit soundproofing facility, Patent Document 3 discloses a soundproofing structure for a temporary fencing for a construction site in which a tip-improved silencer 24 is hung with a hook 44 near the upper end of the temporary fencing for the construction site (see claim 1 in the claims of Patent Document 3, paragraphs

[0036] to

[0050] of the specification, and Figures 1 and 2 of the drawings, etc.).

[0010] However, the tip-improved silencer 24 described in Patent Document 3 is configured to be simply hung on the temporary enclosure with a hook 44, and although it is a technology that can be attached to and removed from an existing vertical wall, it is not a technology that can be applied to soundproof walls that are permanent structures along railways and expressways. In particular, the soundproof structure of the temporary enclosure for construction sites described in Patent Document 3 was not capable of withstanding the wind load caused by the passage of a Shinkansen train. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2005-213753 A [Patent Document 2] JP 2012-180688 A [Patent Document 3] JP 2015-168960 A Summary of the Invention [Problem to be solved by the invention]

[0012] Therefore, the present invention has been devised in consideration of the above-mentioned problems, and its object is to provide a mounting method and structure for a retrofit sound-absorbing device that can be retrofitted to a soundproof wall to improve the soundproofing performance at low cost. [Means for solving the problem]

[0013] A method for installing a retrofit sound-absorbing device according to a first aspect of the present invention is a method for adding a retrofit sound-absorbing device to an existing pillar-less soundproof wall in which soundproof panels are directly fixed to a foundation structure without any pillars being erected thereon, and includes a horizontal member installation step of fixing a horizontal member having a length equal to or greater than the width of a plurality of the soundproof panels across the plurality of soundproof panels, and a retrofit sound-absorbing device installation step of fixing the retrofit sound-absorbing device to the horizontal member. In the horizontal member installation step, the horizontal members are fixed in two upper and lower stages across the plurality of soundproof panels with a vertical gap between them, and in the retrofit sound-absorbing device installation step, the upper stage horizontal member installed across the plurality of soundproof panels is fixed to an upper portion of the retrofit sound-absorbing device, and the lower stage horizontal member is fixed to a lower portion of the retrofit sound-absorbing device, thereby installing the retrofit sound-absorbing device across the plurality of soundproof panels. It is characterized by:

[0014] The installation method for a retrofit sound-absorbing device of the second invention is characterized in that, in the first invention, the retrofit sound-absorbing device has a rear panel and a front panel whose upper end is spaced apart and inclined from the rear panel.

[0016] No. 3 The method for attaching a retrofit sound absorbing device according to the present invention is the first invention. or No. 2 The invention is characterized in that after the cross member installation process, a retrofit sound-absorbing device connection process is included in which the cross member and the retrofit sound-absorbing device are connected via a linear or chain-shaped anti-fall material to prevent the retrofit sound-absorbing device from falling.

[0017] No. 4 The method for attaching a retrofit sound absorbing device according to the present invention is the first to third inventions. 3 In any one of the inventions, the cross member and the retrofit sound absorbing device are attached to the noise source side of the soundproof panel. Effect of the Invention

[0024] First Invention to Third Invention 4 According to the present invention, the soundproofing performance of an existing soundproof wall can be improved at low cost by retrofitting the retrofit sound absorbing device that improves the soundproofing performance of the existing soundproof wall. 4According to the invention, the horizontal members and the retrofit sound absorbing device are joined to the existing soundproof panel by mechanical joining means such as bolts and rivets, so unlike temporary structures such as the soundproof structure of the temporary enclosure for construction sites described in Patent Document 3, the retrofit sound absorbing device has a high degree of fixation and can function as a permanent structure that is permanently installed for many years. 4 According to the invention, a cross member having a length equal to or greater than the width of multiple soundproofing panels is fixed and attached across a number of the soundproofing panels, so that any steps on the outside of the panel surface of the soundproofing wall caused by construction errors during installation of existing soundproofing panels can be corrected and a long, horizontally long retrofit sound-absorbing device can be easily attached in a short amount of time. Furthermore, according to the first to fourth inventions, the cross members are provided in two tiers, one above the other, with a gap between them on the top and bottom of the soundproofing panel, so that the retrofit sound-absorbing device can be fixed more firmly, improving durability and allowing it to function as a permanent structure.

[0026] In particular, 3 According to the invention, the cross member and the retrofit sound-absorbing device are connected by the fall prevention material, which solves the problem of there being no support pillar and therefore no place to fasten the fall prevention wire, and makes it possible to take measures to prevent the retrofit sound-absorbing device from falling in the unlikely event of such an event.

[0027] In particular, 4 According to the invention, since the retrofit sound-absorbing device is attached to the noise source side of the soundproofing panel, installation and maintenance of the retrofit sound-absorbing device can be performed from the track side or roadway side using a stepladder, eliminating the need to set up temporary scaffolding outside the bridge or on the private land side, shortening the construction period and reducing installation and maintenance costs. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a front view showing a soundproof wall to which a retrofit sound absorbing device according to an embodiment of the present invention is attached, as viewed from the noise source side. [Diagram 2] FIG. 2 is a perspective view showing an existing pillar-less soundproof wall before a retrofit sound absorbing device according to an embodiment of the present invention is attached. [Diagram 3] FIG. 3 is an exploded perspective view showing the above-mentioned existing pillar-less soundproof wall. [Figure 4] FIG. 4 is a perspective view showing a retrofit sound absorbing device according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a right side view showing the retrofit sound absorbing device. [Figure 6] FIG. 6 is a front view of the retrofit sound absorbing device as viewed from the noise side. [Figure 7] FIG. 7 is a plan view showing the retrofit sound absorbing device of the above. [Figure 8] FIG. 8 is a partially enlarged perspective view showing an enlarged view of the vicinity of a fall prevention material of a soundproof wall to which a mounting structure for a sound absorbing device according to an embodiment of the present invention is applied. [Figure 9] FIG. 9 is a process explanatory diagram showing a cross member installation process in the mounting method for the retrofit sound absorbing device according to this embodiment. [Figure 10] FIG. 10 is a partially enlarged view of FIG. 9 showing the cross member installation step of the same. [Figure 11] FIG. 11 is a process explanatory diagram showing a retrofit sound absorbing device installation process of the method for attaching a retrofit sound absorbing device according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mounting method and a mounting structure for a retrofit sound absorbing device according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0031] <Sound absorbing device mounting structure> 1 to 8, a mounting structure for a sound absorbing device according to an embodiment of the present invention in which a sound absorbing device is mounted by a mounting method for a retrofit sound absorbing device according to an embodiment of the present invention will be described. The present invention is an invention that is suitably applied when a sound absorbing device is mounted on an existing pillar-less soundproof wall, and will be described by taking as an example a case in which a modified Y-shaped retrofit sound absorbing device 3 having a damping effect due to multiple diffraction or the like is added to an existing pillar-less soundproof wall 10 installed beside a railway line. FIG. 1 is a front view showing a soundproof wall 1 to which a retrofit sound absorbing device 3 according to an embodiment of the present invention has been mounted.

[0032] As shown in Fig. 1, a soundproof wall 1 to which the mounting structure for a sound absorbing device according to the embodiment of the present invention is applied is a mounting structure for adding a modified Y-shaped retrofit sound absorbing device 3 having a damping effect by multiple diffraction or the like to an existing pillar-less soundproof wall 10 via a cross member 2 made of angle iron. Note that the X direction in the figure indicates the pillar-less soundproof wall 10, i.e., the soundproof wall direction along the railway (road), and the Y direction indicates the up-down direction. Also, the Z direction indicates the direction perpendicular to the soundproof wall surface that is perpendicular to the panel surface (railroad, road) of the pillar-less soundproof wall 10 (same below).

[0033] (Pole-less soundproof wall) First, an existing soundproof wall in which a retrofit sound-absorbing device 3 is attached to improve soundproofing performance will be described with reference to Fig. 2 and Fig. 3. Fig. 2 is a perspective view showing an existing support-less soundproof wall 10 before a retrofit sound-absorbing device 3 according to an embodiment of the present invention is attached, and Fig. 3 is an exploded perspective view showing the existing support-less soundproof wall 10. As shown in Figs. 2 and 3, the existing support-less soundproof wall 10 shown in the figures is a support-less soundproof wall in which a soundproof panel 12 (including its frame) is directly fixed to a wall parapet 11, which is a foundation structure made of reinforced concrete, without any support being erected thereon.

[0034] The soundproof panel 12 comprises a roughly vertically long rectangular (rectangular) box-shaped housing 120 having a number of holes 12a drilled into the metal housing made of a stainless steel plate, a plated steel plate, an aluminum plate, or the like, and this housing 120 is filled with sound-absorbing material (not shown).

[0035] The sound absorbing material is preferably a foamed resin such as polyurethane foam, or a fibrous material such as polyester or glass wool, and any material that absorbs sound by attenuating the noise that passes through the holes in the housing 120 through diffuse reflection or the like can be used as appropriate. Note that the sound absorbing material can also be applied to a pillar-less soundproof wall made of a soundproofing plate such as a steel plate that insulates sound by weight, without loading any sound absorbing material.

[0036] 1 to 3, the soundproof panel 12 has mounting plates 12b extending therefrom and protruding downward from the lower ends of the front and rear panels of the housing 120. The mounting plates 12b are bolted in place with anchor bolts embedded in the wall parapet 11, so that the pillar-less soundproof wall 10 is erected on the wall parapet 11 without the need for pillars.

[0037] 2 and 3, a pair of left and right steps 12c, 12d are formed on the side surface of the housing 120, which are provided with steps that fit with the housings 120 of other adjacent soundproofing panels 12. Therefore, adjacent soundproofing panels 12 can fit together and act as one unit to resist wind loads, etc., when a train passes.

[0038] However, there are various types of existing pillar-less soundproof walls 10, and the width W1 of the soundproof panels 12 is not uniform but also varies (see FIG. 2). The width W1 of the general soundproof panels 12 of pillar-less soundproof walls 10 is generally 300 mm to 600 mm. In existing pillar-less soundproof walls 10, the manufacturing error and construction error of the soundproof panels 12 are adjusted by the installation interval G of the soundproof panels 12 in the X direction. For this reason, the width of the installation interval G also generally varies.

[0039] 3, the illustrated pillar-less soundproof wall 10 is erected on the wall parapet 11 by drilling holes in the wall parapet 11 and fastening the mounting plates 12b of the soundproof panels 12 with anchors or the like that are installed afterwards. For this reason, there has been concern that the mounting angles of the soundproof panels 12 in the existing pillar-less soundproof walls 10 vary due to construction errors in the anchors or the like, causing the upper ends (tips) of the soundproof panels 12 to be misaligned in the illustrated Z direction.

[0040] Therefore, in the soundproof wall 1 to which the mounting structure for a sound-absorbing device according to this embodiment is applied, a cross member 2 made of angle iron is fixed across multiple soundproof panels 12 near the upper ends of the soundproof panels 12 of an existing pillar-less soundproof wall 10, and then a later-installed sound-absorbing device 3, which will be described later, is attached. Therefore, even if there is a step between the upper ends of the multiple soundproof panels 12, the later-installed sound-absorbing device 3 can be easily attached.

[0041] In other words, as shown in FIG. 1, a soundproof wall 1 to which the mounting structure for a sound-absorbing device according to this embodiment, in which a retrofit sound-absorbing device 3 is added to an existing pillar-less soundproof wall 10, comprises two cross members 2, 2 made of angle iron, and a retrofit sound-absorbing device 3 attached via these cross members 2, 2.

[0042] 2 and 3, a pair of left and right steps 12c, 12d are formed on the side of the housing 120, which are provided with a step that fits with the housing 120 of another adjacent soundproof panel 12, but the side of the housing 120 does not have to have a step. Also, in FIG. 3, the pillar-less soundproof wall 10 is erected on the wall parapet 11 by drilling holes in the wall parapet 11 and fastening the mounting plate 12b of the soundproof panel 12 with an anchor or the like that is installed after drilling holes in the wall parapet 11, but it is also possible to place a base plate on the upper surface of the wall parapet 11 and attach the housing 120 to the base plate without using the mounting plate 12b. As described above, the illustrated embodiments are merely examples of embodiments realized in carrying out the present invention, and the technical scope of the present invention should not be interpreted as being limited by the illustrated embodiments.

[0043] (Horizontal material) As shown in Figure 1, the cross members 2 are fixed in two tiers, one above the other, across multiple soundproofing panels 12, ..., 12 with a gap between them, with an upper cross member 21 attached along the upper end of the soundproofing panel 12, and a lower cross member 22 attached to the top of the soundproofing panel 12 with a specified gap between them.

[0044] However, the cross member 2 may be only the upper cross member 21. The retrofit sound absorbing device 3 attached to the cross member 2 is a heavy object, and there is little risk of the lower end being lifted up by the wind load, etc., caused by the passing of a train, as long as the upper end is secured in place.

[0045] 1, the upper horizontal member 21 has a length equivalent to about four soundproof panels 12 having a width W1 (see FIG. 2), and the lower horizontal member 22 has a length equivalent to about three soundproof panels 12 having a width W1. Of course, the lengths of the upper horizontal member 21 and the lower horizontal member 22, which are the horizontal members 2, are not limited to the lengths shown in the example, as long as they are attached across multiple soundproof panels 12. In other words, the length of the horizontal member 2 should be at least multiple (multiple) of the width W1 corresponding to the length in the X direction of the retrofit sound-absorbing device 3 to be attached.

[0046] The cross members 2 (upper cross member 21 and lower cross member 22) in this embodiment are made of equal-leg angle iron. Of course, the cross members in this invention are not limited to steel materials such as angle iron, and may be any bar material having the strength to withstand the wind load when a train passes. However, it is preferable that the cross members 2 are made of bar material having a cross-sectional shape with orthogonal faces, such as angle iron or channel steel. This is because it improves the cross-sectional performance of the cross member 2, and it is possible to achieve a weight reduction while maintaining a predetermined strength. Also, this is because it improves the ease of installation of the retrofit sound-absorbing device 3 described below.

[0047] The horizontal members 2 (upper horizontal member 21 and lower horizontal member 22) are provided with a large number of long holes 21a, 22a that are long in the longitudinal direction (see also Figs. 6 and 7). Therefore, in the soundproof wall 1 to which the mounting structure for a sound-absorbing device of the present invention is applied, as described later, the length can be adjusted in response to an error in the installation interval G of the soundproof panels 12 in the X direction, and the retrofit sound-absorbing devices 3 can be easily installed in a short time.

[0048] (Retrofit sound absorbing device: Sound absorbing device) Next, a retrofit sound-absorbing device 3 according to an embodiment of the present invention will be described with reference to Figs. 4 to 8. Fig. 4 is a perspective view showing the retrofit sound-absorbing device 3 according to the embodiment of the present invention. Fig. 5 is a right side view showing the retrofit sound-absorbing device 3, and Fig. 6 is a front view of the retrofit sound-absorbing device 3 as viewed from the noise side. Fig. 7 is a plan view showing the retrofit sound-absorbing device 3. Fig. 8 is a partially enlarged perspective view showing the vicinity of the fall prevention material of the soundproof wall 1 in an enlarged manner.

[0049] 4 to 8, the retrofit sound absorbing device 3 includes a rectangular plate-shaped rear panel 30 extending vertically in the up-down direction, and a rectangular plate-shaped front panel 31 extending obliquely upward from the rear panel 30 toward the noise source side and provided with an upper end spaced apart from the rear panel 30 at an incline, and has a modified Y-shape in vertical cross section. This retrofit sound absorbing device 3 is a sound absorbing device that is retrofitted to an existing pillar-less soundproof wall 10, and improves soundproofing performance by providing a damping effect due to multiple diffraction, etc. against noise that goes around and exceeds the upper end of the soundproof wall 1 due to its modified Y-shape cross section, etc.

[0050] In addition, between the rear panel 30 and the front panel 31, a pair of triangular side panels 32 that cover the sides, and multiple triangular intermediate panels 33 that improve the bending rigidity of the retrofit sound-absorbing device 3 are provided.

[0051] In addition, a sound-absorbing panel 34 is attached to the noise source side (front side) of the front panel 31. This sound-absorbing panel 34 is in the shape of a rectangular box, and has a large number of circular holes 34a drilled on the noise source side (front side).

[0052] The rear panel 30, front panel 31, side panel 32, intermediate panel 33, and sound absorbing panel 34 according to this embodiment are made of highly weather-resistant plated steel sheets. Of course, the material of these panels is not limited to highly weather-resistant plated steel sheets, and may be any metal sheet such as a steel sheet, a stainless steel sheet, or an aluminum sheet that has been subjected to an anti-rust treatment.

[0053] Further, a sound-absorbing material (not shown) is loaded inside the sound-absorbing panel 34. This sound-absorbing material is a fiber material made of polyester resin. Of course, the sound-absorbing material loaded in the sound-absorbing panel 34 may be other fiber materials such as foamed resin such as polyurethane foam or glass wool, as in the existing pillar-less soundproof wall 10. In short, the sound-absorbing material loaded in the sound-absorbing panel 34 may be any material that absorbs noise by attenuating the noise that passes through the circular holes 34a through diffuse reflection or the like.

[0054] 8, the upper cross member 21 and the retrofit sound-absorbing device 3 are connected by a fall prevention material 4 made of a wire. Of course, the fall prevention material according to the present invention is not limited to a wire, and may be any material having a predetermined strength capable of withstanding the impact load of the fall of the retrofit sound-absorbing device 3 in the form of a linear or chain such as a flexible wire.

[0055] 4 to 8, the retrofit sound-absorbing device 3 includes a rectangular plate-shaped rear panel 30 extending vertically in the up-down direction, and a rectangular plate-shaped front panel 31 extending obliquely upward from the rear panel 30 toward the noise source side and having an upper end spaced apart from the rear panel 30 and inclined, and the vertical cross-sectional shape is shown as a modified Y-shape, but this is merely a preferred embodiment. As long as the retrofit sound-absorbing device 3 can improve soundproofing performance by being retrofitted to the top of an existing pillar-less soundproof wall 10, the technical scope of the present invention should not be interpreted as being limited by the exemplified embodiments.

[0056] <How to install a retrofit sound absorbing device> Next, a method for attaching a retrofit sound absorbing device according to an embodiment of the present invention will be described with reference to Figures 9 to 11, 1, 5, and 8. The following describes an example in which the above-mentioned retrofit sound absorbing device 3 is attached to the above-mentioned existing pillar-less soundproof wall 10 to construct a soundproof wall 1 to which the mounting structure for the sound absorbing device according to the embodiment of the present invention is applied.

[0057] (Horizontal material installation process) Fig. 9 is a process explanatory diagram showing a cross member installation step of the mounting method for a retrofit sound absorbing device according to this embodiment, and Fig. 10 is a partial enlarged view of Fig. 9 showing the cross member installation step. As shown in Figs. 9 and 10, in the mounting method for a retrofit sound absorbing device according to this embodiment, first, a cross member installation step is performed in which the above-mentioned cross member 2 is fixed across and mounted on a plurality of soundproof panels 12 of an existing pillar-less soundproof wall 10.

[0058] Specifically, in this process, an upper cross member 21 made of an equal-legged angle iron having a length equivalent to approximately four of the width W1 (see Figure 2) of the aforementioned soundproof panel 12 is joined and fixed across multiple soundproof panels 12 (four in the illustrated embodiment) using mechanical joining means such as bolts or rivets.

[0059] In this process, the upper cross member 21 is fixed across multiple soundproof panels 12 near the upper ends of the soundproof panels 12 of the existing pillar-less soundproof wall 10. This makes it easier to attach the retrofit sound absorbing device 3 in a later process even if there is a step between the upper ends of the multiple soundproof panels 12.

[0060] In short, this process solves the problem that steps occur between the tips of existing pillar-less soundproof walls 10 due to product manufacturing errors and construction errors during installation, as described in the Background Art section, making it difficult to attach the retrofit sound-absorbing device 3, and improves the construction efficiency of the installation work for the retrofit sound-absorbing device 3.

[0061] Also, in this process, the upper cross member 21 is attached to the noise source side (front side) of the soundproof panel 12. Although it is possible to attach the upper cross member 21 to the back side of the soundproof panel 12, this may reduce the sound absorption efficiency of the retrofit sound absorbing device 3, so it is preferable to attach it to the noise source side (front side) of the soundproof panel 12. Also, this is because the outside of the pillar-less soundproof wall 10 is often privately owned land, and it is often difficult to erect temporary scaffolding.

[0062] In this step, the lower cross member 22 may be attached to the noise source side of the soundproof panel 12 below the upper cross member 21 with a distance corresponding to the height of the retrofit sound-absorbing device 3. By doing so, the retrofit sound-absorbing device 3 can be placed and attached in a step described later on top of the lower cross member 22 attached in this step, improving the workability when attaching the retrofit sound-absorbing device 3, which is a heavy object.

[0063] (Installation process of retrofit sound absorbing device) Fig. 11 is a process explanatory diagram showing the process of installing a retrofit sound absorbing device in the method of installing a retrofit sound absorbing device according to this embodiment. As shown in Fig. 11, the method of installing a retrofit sound absorbing device according to this embodiment next performs a process of installing the retrofit sound absorbing device 3 to the upper cross member 21 attached to the existing pillar-less soundproof wall 10 in the previous process.

[0064] 6, the above-mentioned lower cross member 22 is joined in advance to the lower end of the retrofit sound absorbing device 3 by mechanical joining means such as bolts or rivets. Then, the retrofit sound absorbing device 3 to which the lower cross member 22 is joined is joined by mechanical joining means to the upper cross member 21 that was attached to the existing pillar-less soundproof wall 10 in the previous process.

[0065] At this time, the retrofit sound-absorbing device 3 is attached to a surface perpendicular to the surface of the upper cross member 21 made of equal-legged angle iron that abuts the soundproof panel 12, and is suspended and supported by the upper cross member 21 attached to the soundproof panel 12.

[0066] Moreover, the lower cross member 22 attached to the lower end of the retrofit sound-absorbing device 3 is attached to the soundproof panel 12 at a surface perpendicular to the surface that abuts against the retrofit sound-absorbing device 3. Therefore, the lower part of the retrofit sound-absorbing device 3 is placed on and fixed to the lower cross member 22.

[0067] Therefore, the retrofit sound absorbing device 3 can be firmly fixed to the soundproof panel 12 by the upper and lower two-tiered upper horizontal members 21 and lower horizontal members 22, improving durability. Therefore, the retrofit sound absorbing device 3 attached to the existing pillar-less soundproof wall 10 can function as a permanent structure.

[0068] As described above, the upper horizontal member 21 and the lower horizontal member 22 of the horizontal member 2 are formed with the long holes 21a, 22a. Therefore, the length can be adjusted in response to an error in the installation interval G of the soundproof panels 12 along the X direction of the existing pillar-less soundproof wall 10, and the retrofit sound-absorbing device 3 can be easily installed in a short time.

[0069] It is also possible to attach only the upper cross member 21 to the existing pillar-less soundproof wall 10 in the previous process, and then, in this retrofit sound-absorbing device installation process, fix the retrofit sound-absorbing device 3 to the upper cross member 21, and then attach the lower cross member 22 to the soundproof panel 12 of the existing pillar-less soundproof wall 10. This is because, ultimately, the retrofit sound-absorbing device 3 can be firmly fixed to the existing pillar-less soundproof wall 10.

[0070] Furthermore, by attaching the cross member 2 and the retrofit sound-absorbing device 3 to the noise source side of the existing pillar-less soundproof wall 10 as shown in FIG. 11, the installation and maintenance of the retrofit sound-absorbing device 3 can be carried out from the track or roadway side using a stepladder, eliminating the need to set up temporary scaffolding outside the bridge or on the private land side, shortening the construction period and reducing installation costs.

[0071] (Aftermarket sound absorbing device connection process) As shown in Fig. 8, the method for installing a retrofit sound-absorbing device according to this embodiment next involves a retrofit sound-absorbing device connecting step in which the upper cross member 21 and the retrofit sound-absorbing device 3 are connected with the fall prevention member 4 described above. This is to prevent the retrofit sound-absorbing device 3 from falling onto the railway or roadway and causing an accident, even if the retrofit sound-absorbing device 3 should fall off the upper cross member 21. By performing this step, the problem described in the background art that there is no support pillar and therefore no place to fasten the fall prevention wire can be solved, and measures can be taken to prevent the retrofit sound-absorbing device 3 from falling.

[0072] According to the mounting method for a retrofit sound-absorbing device and the mounting structure for a sound-absorbing device of the embodiment of the present invention described above, the retrofit sound-absorbing device 3 that improves soundproofing performance can be retrofitted to an existing pillar-less soundproof wall 10, thereby improving the soundproofing performance at low cost.

[0073] Furthermore, according to the mounting method and mounting structure for a sound-absorbing device of this embodiment, the cross member 2 and the retrofit sound-absorbing device 3 are joined to the existing soundproof panel 12 by mechanical joining means such as bolts or rivets. Therefore, unlike temporary structures such as the soundproofing structure of the temporary fencing for construction sites described in Patent Document 3, the retrofit sound-absorbing device has a high degree of fixation and can function as a permanent structure that is permanently installed for many years.

[0074] Furthermore, according to the mounting method and mounting structure for a retrofit sound-absorbing device of this embodiment, a cross member 2 having a length equal to or greater than the width W1 of multiple soundproof panels 12 is fixed across multiple soundproof panels 12, so that any unevenness in the outer surface of the panel of the soundproof wall 1 caused by construction errors during installation of the existing soundproof panels 12 can be corrected and the horizontally long retrofit sound-absorbing device 3 can be easily mounted in a short amount of time.

[0075] In addition, according to the mounting method and mounting structure for a sound absorbing device of the embodiment of the present invention, the retrofit sound absorbing device 3 can be mounted directly to the soundproof panel 12, so that a common retrofit sound absorbing device 3 can be installed without being limited by the width W1, layout, or type of the existing soundproof panel 12, thereby reducing the number of parts and thus costs.

[0076] Furthermore, according to the mounting method for a retrofit sound-absorbing device and the mounting structure for a sound-absorbing device of this embodiment, the cross members 2 are provided in two tiers, one above the other, with a gap between them on the top and bottom of the soundproof panel, so that the retrofit sound-absorbing device 3 can be fixed more firmly, improving its durability and allowing it to function as a permanent structure.

[0077] The mounting method and mounting structure of a retrofit sound absorbing device according to the embodiment of the present invention have been described in detail above. However, the above-mentioned and illustrated embodiments are merely examples of the present invention, and the technical scope of the present invention should not be interpreted as being limited by the illustrated embodiments. [Explanation of symbols]

[0078] 1: Soundproof wall (sound absorbing device mounting structure) 2: Horizontal material 21: Upper horizontal material (horizontal material) 21a: Long hole 22: Lower horizontal material (horizontal material) 22a: long hole 3: Retrofit sound absorbing device (sound absorbing device) 30: Rear panel 31: Front panel 32: Side panel 33: Middle panel 34: Sound absorbing panel 34a: Circular hole 4: Fall prevention material 10: Pillar-less soundproof wall (existing soundproof wall) 11: Wall parapet (foundation structure) 12: Soundproofing panel 120: Cabinet 12a: hole 12b: Mounting plate 12c,12d: Stepped section G: Installation interval W1: Width of soundproof panel

Claims

1. A method for attaching a retrofit sound absorbing device to an existing pillar-less soundproof wall in which a soundproof panel is directly fixed to a foundation structure without a pillar being erected, comprising the steps of: a horizontal member installation step of fixing and attaching a horizontal member having a length equal to or greater than the width of a plurality of the soundproofing panels across the plurality of soundproofing panels; and a retrofit sound-absorbing device installation step of fixing the retrofit sound-absorbing device to the horizontal member, In the cross member installation step, the cross members are fixed in two tiers, one above the other, across the multiple soundproof panels with a vertical gap between them, In the retrofit sound absorbing device installation step, the upper horizontal member installed across the plurality of soundproof panels is fixed to an upper portion of the retrofit sound absorbing device, and the lower horizontal member is fixed to a lower portion of the retrofit sound absorbing device, thereby installing the retrofit sound absorbing device across the plurality of soundproof panels. A method for installing a retrofit sound absorbing device.

2. The retrofit sound absorbing device has a rear panel and a front panel whose upper end is spaced apart from and inclined relative to the rear panel. A method for mounting the retrofit sound absorbing device according to claim 1 .

3. a step of connecting the horizontal member and the retrofit sound absorbing device via a linear or chain-shaped fall prevention member after the step of installing the horizontal member so that the retrofit sound absorbing device does not fall; 3. A method for mounting a retrofit sound absorbing device according to claim 1 or 2.

4. The cross member and the retrofit sound absorbing device are attached to the noise source side of the soundproof panel.

4. A method for mounting a retrofit sound absorbing device according to claim 1, further comprising the steps of:

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