Noise prevention equipment

Abstract

To provide a noise prevention device to be placed between two adjacent gutter covers, which can be placed without opening or closing the gutter covers and can also be placed with one of the gutter covers in place, and which can suppress noise and damage caused by vibration of the gutter covers. [Solution] The noise prevention device 1 comprises a first plate portion 11 that can be placed between two adjacent gutter covers, and a second plate portion 12 that extends from the side end of the first plate portion so as to be perpendicular to the first plate portion, and a wedge-shaped portion 13 is provided at the tip side portion of the second plate portion, the thickness of which decreases in the direction of extension of the second plate portion. The surface of the second plate portion opposite the first plate portion is a flat surface 17 that is perpendicular to the direction of extension of the first plate portion, and the surface of the wedge-shaped portion of the second plate portion facing the first plate portion is an inclined or curved surface that is inclined or curved so that the thickness of the second plate portion decreases in the direction of extension of the second plate portion.

Description

[Technical Field]

[0001] The present invention relates to a noise prevention device, and more particularly to a noise prevention device to be placed between two adjacent gutter covers. [Background technology]

[0002] Traditionally, drain covers, such as concrete covers or metal gratings, have been placed over the openings at the top of drains (for example, U-shaped drains or gate-shaped drains). When vehicles run over such drain covers, noise (rattle noise) can be generated, which, along with damage caused by vibration to the drain covers, is a major problem in the maintenance and management of urban roads. These noises are caused by small, unavoidable errors during construction, and although they are difficult to completely eliminate, it is desirable to reduce them as much as possible. In contrast, Patent Document 1 (Patent No. 5539158) discloses a gutter cover spacer (1) that is arranged between a gutter with a U-shaped cross section and a rectangular gutter cover that closes the opening on its upper surface to reduce vibration and noise, and that is characterized by comprising a strip-shaped lower plate portion (2) made of an elastic material that can be attached to the bottom surface of the longitudinal end of the gutter cover along its short side, and a vertical plate portion (4) that is connected at right angles to the long side at the end (3) of the lower plate portion (2) and can be attached to the short end surface of the gutter cover. The applicant of the present application also discloses in Patent Document 2 (Utility Model Registration No. 3249307) a noise prevention device to be placed between two adjacent gutter covers, comprising a top plate portion 11, a plate-shaped portion 12 extending downward from the underside of the top plate portion 11, and elastic portions 13, 14 that protrude outward from the plate-shaped portion 12 and are capable of elastic deformation in the thickness direction of the plate-shaped portion 12 by being clamped between the two adjacent gutter covers, with the elastic portions 13, 14 comprising space portions 15 that accommodate the elastic deformation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5539158 [Patent Document 2] Utility Model Registration No. 3249307 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the gutter cover spacer disclosed in Patent Document 1, the lower plate portion is attached to the bottom surface of the gutter cover, so the gutter cover needs to be opened and closed (lifted) when placing it, making the installation work of the gutter cover spacer complicated and involving a great deal of effort and danger. Furthermore, the noise prevention device disclosed in Patent Document 2 can be installed without opening or closing the gutter cover, making installation of the noise prevention device easy, but there has been a demand for an increased variety of noise prevention devices to accommodate various installation situations. Therefore, the object of the present invention is to provide a noise prevention device that is placed between two adjacent gutter covers, that can be installed without opening or closing the gutter covers, and that can be installed even when one of the gutter covers is in place, and that can suppress noise and damage caused by vibration of the gutter covers. [Means for solving the problem]

[0005] The above objectives are achieved by the following: (1) A noise prevention device placed between two adjacent gutter covers, a first plate portion that can be arranged between the two adjacent gutter covers; a second plate portion extending from a side end of the first plate portion so as to be perpendicular to the first plate portion; A noise prevention device in which a wedge-shaped portion whose thickness decreases in the extension direction of the second plate portion is provided at the tip side portion of the second plate portion.

[0006] (2) A noise prevention device according to (1) above, comprising a pair of second plate portions extending from the side ends of the first plate portion so as to be perpendicular to the first plate portion. (3) A noise prevention device as described in (1) or (2) above, in which the surface of the second plate portion opposite the first plate portion is a flat surface perpendicular to the extension direction of the first plate portion, and the surface of the wedge-shaped portion of the second plate portion facing the first plate portion is an inclined or curved surface that is inclined or curved so that the thickness of the second plate portion becomes thinner toward the extension direction of the second plate portion. (4) A noise prevention device according to any one of (1) to (3) above, wherein the second plate portion includes a first wedge-shaped portion extending from the base end of the second plate portion and having a thickness that decreases in the direction of extension of the second plate portion, a step portion connected to the tip of the first wedge-shaped portion, and a second wedge-shaped portion extending from the step portion and having a thickness that decreases in the direction of extension of the second plate portion. (5) A surface of the second plate portion opposite to the first plate portion is a flat surface perpendicular to the extending direction of the first plate portion, and the second plate portion has a maximum plate thickness at a base end of the first wedge-shaped portion, Furthermore, the surfaces of the first wedge-shaped portion and the second wedge-shaped portion on the side of the first plate portion are inclined or curved surfaces that are inclined or curved so that the plate thickness of the first wedge-shaped portion and the second wedge-shaped portion becomes thinner toward the extension direction of the second plate portion. (6) The surfaces of the first wedge-shaped portion and the second wedge-shaped portion on the first plate portion side are respectively a first arc-shaped surface and a second arc-shaped surface that curve so that the plate thickness of the first wedge-shaped portion and the second wedge-shaped portion becomes thinner in the extension direction of the second plate portion, and the radius of curvature R1 of the first arc-shaped surface is smaller than the radius of curvature R2 of the second arc-shaped surface. (7) A noise prevention device according to any one of (4) to (6) above, wherein the length L1 of the first wedge-shaped portion in the extension direction is longer than the length L2 of the second wedge-shaped portion in the extension direction. (8) The noise prevention device according to any one of (1) to (7) above, wherein the noise prevention device has a substantially constant cross-sectional shape in a cross section perpendicular to the extension direction of the first plate portion. (9) A noise suppressor according to any one of (1) to (8) above, which is made of rubber, elastomer or resin. (10) A noise suppressor according to any one of (1) to (8) above, which is made of weather-resistant rubber, elastomer, or resin. (11) The noise prevention device is made of rubber or elastomer having a Shore A hardness of 75 to 85, and has a substantially constant cross-sectional shape in a cross section perpendicular to the extension direction of the first plate portion.

[0007] The above objectives are also achieved by the following: (12) A noise prevention device that is placed between two adjacent gutter covers placed on the upper surfaces of opposing gutter cover placement parts provided on the upper part of a gutter body, and between the two adjacent gutter covers and the side parts of the gutter cover placement parts, a first plate portion that can be arranged between the two adjacent gutter covers; A pair of second plate portions extend from the side ends of the first plate portions so as to be perpendicular to the first plate portions, and are capable of being arranged between the end side surfaces of the two adjacent gutter covers and the side portions of the gutter cover placing portion, Each of the pair of second plate portions includes a first wedge-shaped portion extending from a base end of the second plate portion and having a thickness that decreases in the extending direction of the second plate portion, a step portion connected to a tip end of the first wedge-shaped portion, and a second wedge-shaped portion extending from the step portion and having a thickness that decreases in the extending direction of the second plate portion, a surface of the second plate portion opposite to the first plate portion is a flat surface perpendicular to the extension direction of the first plate portion, and the second plate portion has a thickness that is greatest at a base end of the first wedge-shaped portion; Furthermore, the surfaces of the first wedge-shaped portion and the second wedge-shaped portion on the first plate portion side are inclined or curved surfaces that are inclined or curved so that the plate thicknesses of the first wedge-shaped portion and the second wedge-shaped portion become thinner toward the extension direction of the second plate portion, The noise suppressor is made of rubber or elastomer having a Shore A hardness of 75 to 85, and has a substantially constant cross-sectional shape in a cross section perpendicular to the width direction of the first plate portion. [Effects of the Invention]

[0008] The noise prevention device of the present invention comprises a first plate portion that can be placed between two adjacent gutter covers, and a second plate portion that extends from the side end of the first plate portion perpendicular to the first plate portion, and a wedge-shaped portion is provided at the tip end portion of the second plate portion whose thickness decreases toward the extension direction of the second plate portion. This allows the gutter cover to be installed without opening or closing it, and can also be installed with one gutter cover in place, thereby suppressing noise and damage caused by vibration of the gutter cover.

[0009] The noise prevention device of the present invention includes a first plate portion that can be placed between two adjacent gutter covers, and a pair of second plates that extend from side ends of the first plate portion perpendicular to the first plate portion and can be placed between the end side surfaces of the two adjacent gutter covers and the side portions of the gutter cover mounting portion. Each of the pair of second plates includes a first wedge-shaped portion that extends from a base end of the second plate portion and whose thickness decreases toward the extension direction of the second plate portion, a step portion connected to the tip of the first wedge-shaped portion, and a second wedge-shaped portion that extends from the step portion and whose thickness decreases toward the extension direction of the second plate portion. The surface of the second plate portion opposite the first plate portion is a flat surface perpendicular to the extension direction of the first plate portion, and the second plate portion is thickest at the base end of the first wedge-shaped portion (the portion connected to the first plate portion). Furthermore, the surfaces of the first and second wedge-shaped portions facing the first plate portion are inclined or curved so that the plate thicknesses of the first and second wedge-shaped portions become thinner in the direction of extension of the second plate portion.The noise suppressor is made of rubber or elastomer with a Shore A hardness of 75 to 85, and has a substantially constant cross-sectional shape in a cross section perpendicular to the width direction of the first plate portion. This allows the gutter covers to be installed without opening or closing them, and can also be installed with one gutter cover in place, thereby suppressing noise and damage caused by vibration of the gutter covers. The noise suppressor also has appropriate elasticity, effectively suppressing noise and damage caused by vibration of the gutter covers. Furthermore, the noise suppressor can be manufactured by extrusion molding, significantly reducing the manufacturing cost of the noise suppressor. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view showing an embodiment of a noise suppressor according to the present invention. [Figure 2] FIG. 2 is a plan view of the noise suppressor shown in FIG. [Figure 3] FIG. 3 is a partially enlarged explanatory view of FIG. [Figure 4] FIG. 4 is a plan view showing an embodiment of a gutter in which a noise prevention device according to the present invention is installed. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is an enlarged view of part B in FIG. [Figure 7] FIG. 7 is a plan view showing an embodiment of a method for installing a noise suppressor according to the present invention. [Figure 8] FIG. 8 is an enlarged explanatory view of part C in FIG. 7, showing an embodiment of a method for installing a noise prevention device according to the present invention. [Figure 9] FIG. 9 is a plan view showing another embodiment of a noise suppressor according to the present invention. [Figure 10] FIG. 10 is a plan view showing another embodiment of a noise suppressor according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The noise suppressor of the present invention will be described using the embodiment shown in the drawings. In this embodiment, the up-down direction in Fig. 1 may be referred to as the up-down direction, the left-right direction as the extension direction of the first plate part of the noise suppressor, and the up-down direction in Fig. 2 as the extension direction of the second plate part of the noise suppressor.

[0012] As shown in Figures 1 to 3, the noise prevention device 1 of the present invention is a noise prevention device that is placed between two adjacent gutter covers, and comprises a first plate portion 11 that can be placed between two adjacent gutter covers, and a second plate portion 12 that extends from the side end of the first plate portion 11 perpendicular to the first plate portion 11, and a wedge-shaped portion 13 is provided at the tip end portion of the second plate portion 12, the thickness of which decreases toward the extension direction of the second plate portion 12.

[0013] As shown in Figs. 1 to 3, the noise prevention device 1 of the present invention is a noise prevention device that is placed between two adjacent gutter covers placed on the upper surfaces of opposing gutter cover placement parts provided on the upper part of the gutter body, and between two adjacent gutter covers and the side parts of the gutter cover placement parts, and includes a first plate part 11 that can be placed between the two adjacent gutter covers, and a pair of plates extending from the side ends of the first plate part 11 so as to be perpendicular to the first plate part 11. The second plate portion 12 includes a pair of second plate portions 12, 12 that can be arranged between the end side surfaces of two adjacent gutter covers and the side portions of the gutter cover placement portion, and each of the pair of second plate portions 12, 12 includes a first wedge-shaped portion 14 that extends from the base end of the second plate portion 12 and has a thickness that decreases in the direction in which the second plate portion 12 extends, a step portion 15 that is connected to the tip of the first wedge-shaped portion 14, and a step portion 15 that extends from the step portion 15 and has a thickness that decreases in the direction in which the second plate portion 12 extends. The second plate portion 12 has a second wedge-shaped portion 16 in which the plate thickness is reduced, and the surface of the second plate portion 12 opposite to the first plate portion 11 is a flat surface 17 perpendicular to the extending direction of the first plate portion 11, and the second plate portion 12 has a plate thickness (t2) that is greatest at the base end of the first wedge-shaped portion 14 (the connecting portion with the first plate portion 11). Furthermore, the surfaces of the first plate portion 11 side of the first wedge-shaped portion 14 and the second wedge-shaped portion 16 are each The noise prevention device has an inclined or curved surface (here, the first arc-shaped surface 18 and the second arc-shaped surface 19) that is inclined or curved so that the thickness of the first wedge-shaped portion 14 and the second wedge-shaped portion 16 becomes thinner toward the extension direction of the second plate portion 12, and is made of rubber or elastomer with a Shore A hardness of 75 to 85, and has a substantially constant cross-sectional shape in a cross section perpendicular to the width direction of the first plate portion 11.

[0014] Specifically, the noise suppressor 1 of this embodiment includes a first plate portion 11 that is rectangular in front view, as shown in Fig. 1. In this embodiment, the vertical dimension of the first plate portion 11 (vertical dimension in Fig. 1) is greater than the extension dimension (left-right dimension in Fig. 2). The vertical dimension of the first plate portion 11 is preferably 80 to 90 mm, and the extension dimension is preferably 45 to 55 mm.

[0015] The thickness t1 (vertical dimension in FIG. 2) of the first plate portion 11 is preferably 2 to 3 mm. In this embodiment, the first plate portion 11 has a substantially constant thickness over the entire length in the extension direction, but for example, the thickness of the entire portion or the portion on the tip side in the extension direction may be made thinner toward the tip side in the extension direction (left side in FIG. 2).

[0016] As shown in FIGS. 1 and 2, the noise suppression device 1 includes a second plate portion 12 extending from a side end (the right end in FIG. 2) of the first plate portion 11 so as to be perpendicular to the first plate portion 11. In this embodiment, the noise suppression device 1 includes a pair of second plate portions 12, 12 extending from each side end of the first plate portion 11 so as to be perpendicular to the first plate portion 11. This allows both corners of two adjacent gutter covers to be covered by the first plate portion 11 and the second plate portions 12, 12. In this embodiment, the pair of second plate portions 12, 12 have symmetrical shapes with respect to the first plate portion 11. Below, a description of one second plate portion 12 may be used instead of a description of each second plate portion 12.

[0017] In this embodiment, the second plate portion 12 has a vertical dimension (vertical dimension in FIG. 1) that is substantially the same as the vertical dimension of the first plate portion 11 described above. In other words, the second plate portion 12 extends from the entire vertical portion of the first plate portion 11. The second plate portion may extend from a portion of the first plate portion in the vertical direction. The vertical dimension of the second plate portion 12 (the vertical dimension in FIG. 2, which is the dimension from the center of the thickness of the first plate portion 11 to the tip of the second plate portion 12 in the vertical direction) is preferably smaller than the vertical dimension of the first plate portion 11 (horizontal dimension in FIG. 2), and more preferably smaller than half the vertical dimension of the first plate portion 11. The vertical dimension of the second plate portion 12 is preferably 10 to 20 mm.

[0018] A wedge-shaped portion 13 whose thickness decreases in the direction of extension of the second plate portion 12 is provided at a tip end portion of the second plate portion 12. In this embodiment, as shown in Figures 2 and 3, the second plate portion 12 has the wedge-shaped portion 13 over substantially the entire length in the extension direction, and the second plate portion 12 (wedge-shaped portion 13) includes a first wedge-shaped portion 14 that extends from the base end of the second plate portion 12 and whose thickness decreases in the direction of extension of the second plate portion 12, a step portion 15 connected to the tip of the first wedge-shaped portion 14, and a second wedge-shaped portion 16 that extends from the step portion 15 and whose thickness decreases in the direction of extension of the second plate portion 12. Note that it is preferable that the length L1 of the first wedge-shaped portion 14 in the extension direction be longer than the length L2 of the second wedge-shaped portion 16 in the extension direction.

[0019] In the noise suppression device 1 of this embodiment, the second plate portion 12 (wedge-shaped portion 13) has a thickness that decreases in the direction in which the second plate portion 12 extends at the first wedge-shaped portion 14, and then temporarily increases in thickness at the step portion 15. In this embodiment, the step portion 15 is a part of the wedge-shaped portion 13, and its thickness is preferably smaller than the thickness (maximum thickness) t2 of the base end of the second plate portion 12 (first wedge-shaped portion 14). The noise suppression device 1 of this embodiment has the step portion 15 (which forms a groove extending in the vertical direction of the noise suppression device 1 between the first wedge-shaped portion 14 and the step portion 15), which has the effect of reducing resistance during installation (such as contact resistance with the gutter cover) and improving the discharge of water, sand, and the like that accumulates on the gutter cover after installation.

[0020] The surface of the second plate portion 12 of the noise prevention device 1 opposite to the first plate portion 11 forms a flat surface 17 perpendicular to the extending direction of the first plate portion 11. This makes it easy to arrange the second plate portion 12 along the side of a gutter cover mounting portion of a gutter, which will be described later. The second plate portion 12 has a maximum thickness t2 at the base end of the first wedge-shaped portion 14 (the connecting portion with the first plate portion 11). As shown in FIG. 2, it is preferable that the thickness (maximum thickness) t2 of the second plate portion 12 is smaller than the thickness t1 of the first plate portion 11. This makes it easy to arrange the second plate portion 12 between the gutter cover and the side of the gutter cover mounting portion. Furthermore, the surfaces of the first wedge-shaped portion 14 and the second wedge-shaped portion 16 facing the first plate portion 11 are inclined or curved surfaces that are inclined or curved so that the plate thicknesses of the first wedge-shaped portion 14 and the second wedge-shaped portion 16 become thinner toward the extension direction of the second plate portion 12.

[0021] In this embodiment, as shown in Figures 2 and 3, the surfaces of the first wedge-shaped portion 14 and the second wedge-shaped portion 16 on the first plate portion 11 side are respectively a first arc-shaped surface 18 and a second arc-shaped surface 19 that curve so that the plate thickness of the first wedge-shaped portion 14 and the second wedge-shaped portion 16 becomes thinner toward the extension direction of the second plate portion 12, and the radius of curvature R1 of the first arc-shaped surface 18 is smaller than the radius of curvature R2 of the second arc-shaped surface 19. This ensures a sufficient plate thickness (t2) at the base end (connection portion with first plate portion 11) of second plate portion 12, improving the noise suppression function and durability of noise preventive device 1, and by making the plate thickness of second plate portion 12 (wedge-shaped portion 13) thinner at first wedge-shaped portion 14, it is possible to improve the ease of placement of second plate portion 12 (first wedge-shaped portion 14) (ease of insertion between the gutter cover and the gutter main body (side portion of the gutter cover mounting portion)).Furthermore, by ensuring the plate thickness (strength) of second wedge-shaped portion 16, it is possible to improve the ease of placement of second plate portion 12 (second wedge-shaped portion 16) (ease of insertion between the gutter cover and the gutter main body (side portion of the gutter cover mounting portion)) and durability.

[0022] The radius of curvature R1 of the first arcuate surface 18 is preferably 27 to 30 mm, and the radius of curvature R2 of the second arcuate surface 19 is preferably 56 to 59 mm.

[0023] The noise suppressor 1 of this embodiment has a substantially constant cross-sectional shape in a cross section perpendicular to the extension direction of the first plate portion 11. This allows the noise suppressor 1 to be manufactured by extrusion molding. That is, a heated and melted material (rubber or elastomer, described below) can be extruded through a die (metal mold) with the cross-sectional shape described above (the shape shown in FIG. 2) and continuously molded. This allows the manufacturing cost of the noise suppressor to be significantly reduced compared to other molding methods.

[0024] The noise suppressor 1 is preferably made of rubber or resin (including elastomer). In particular, it is preferably made of rubber or elastomer. If it is made of rubber or elastomer, the noise suppressor 1 will have appropriate elasticity and can effectively suppress noise and damage caused by vibration of the gutter cover. It is preferable that the material constituting the noise suppressor is a material that can be extruded as described above. The rubber that can be used to form the noise suppressor 1 includes natural rubber, chloroprene rubber, nitrile rubber, ethylene propylene rubber, butyl rubber, urethane rubber, silicone rubber, and fluororubber, and weather-resistant ethylene propylene rubber, butyl rubber, urethane rubber, silicone rubber, and fluororubber are particularly preferred. The rubber may be one type alone or a combination of two or more types. The resin that forms the noise suppressor 1 may be polyethylene, polypropylene, nylon, polyester (polyethylene terephthalate), polyvinyl chloride, thermoplastic elastomer, or the like. Suitable thermoplastic elastomers include nylon-based (e.g., polyamide elastomer), urethane-based (e.g., polyurethane elastomer), polyester-based (e.g., polyethylene terephthalate elastomer), olefin-based (e.g., polyethylene elastomer, polypropylene elastomer), styrene-based (styrene-butadiene copolymer, styrene-ethylene-propylene-styrene copolymer), vinyl chloride resin-based thermoplastic elastomer (e.g., polyvinyl chloride in hard segments and nitrile rubber in soft segments), and olefin-based thermoplastic elastomers composed primarily of olefin rubber and olefin resin (e.g., Mitsui Chemicals, Inc., trade name Milastomer (registered trademark) 8030NHS: a thermoplastic elastomer composition obtained by dynamically crosslinking a mixture containing ethylene-propylene-ethylidene norbornene terpolymer rubber and polypropylene, Shore A hardness (immediately after) = 88, MFR (measured at 230°C under a load of 98 N) = 9.3 g / 10 min). In particular, elastomers are preferred as the resin forming the noise suppressor 1, and the elastomers mentioned above are preferred. In particular, polyester-based elastomers (e.g., polyethylene terephthalate elastomers), olefin-based elastomers (e.g., polyethylene elastomers, polypropylene elastomers, and olefin-based thermoplastic elastomers primarily composed of olefin-based rubber and olefin-based resin), styrene-based elastomers (styrene-butadiene copolymers, styrene-ethylene-propylene-styrene copolymers), and vinyl chloride resin-based thermoplastic elastomers (e.g., those with polyvinyl chloride hard segments and nitrile rubber soft segments) are preferred, as they have good weather resistance. Furthermore, thermoplastic elastomers containing weather stabilizers in any of the above-mentioned thermoplastic elastomers can also be used suitably.

[0025] Furthermore, the material forming the noise suppression device 1 is preferably made of rubber or elastomer with a Shore A hardness of 60 to 90. This ensures the rigidity of the noise suppression device 1 while improving the noise suppression function of the noise suppression device 1, and improves the installability (ease of insertion between the gutter cover and the gutter main body (the side of the gutter cover mounting portion)) and durability of the noise suppression device 1. The rubber or elastomer forming the noise suppression device 1 more preferably has a Shore A hardness of 65 to 85, and even more preferably has a Shore A hardness of 75 to 85. In particular, by forming the noise suppression device from rubber or elastomer with a Shore A hardness of 75 to 85, the rigidity of the noise suppression device 1 can be further ensured, and the installability (ease of insertion between the gutter cover and the gutter main body (the side of the gutter cover mounting portion)) and durability of the noise suppression device 1 can be improved.

[0026] Next, an example of a method for disposing the noise prevention device 1 of this embodiment between two adjacent gutter covers will be described with reference to FIGS. As shown in Figures 4 and 5, the gutter body 52 of the gutter 50 of this embodiment includes a bottom plate 53 and a pair of side walls 54, 54 extending upward from both sides of the bottom plate 53. A gutter lid mounting portion 56 consisting of a pair of opposing upper surface portions 55, 55 is formed in the upper portion of the gutter body 52 (each side wall 54). Specifically, opposing steps are formed in the upper portions of the side walls 54, 54, and the upper surface portions 55, 55 are formed thereon. A gutter lid 51 is placed on the gutter lid mounting portion 56 consisting of the upper surface portions 55, 55. Each side wall 54 further includes an upper side wall portion 58 (a side portion of the gutter lid mounting portion) extending upward from the step (upper surface portion 55).

[0027] As shown in Fig. 4, a plurality of gutter bodies 52 and gutter covers 51 are provided consecutively in the longitudinal direction in a gutter in which the noise prevention device 1 is to be used. Note that reference numeral 59 in Fig. 4 denotes drain port-forming recesses 59 provided at both longitudinal ends of the gutter cover 51 for draining rainwater and the like into the gutter body 52. ​​Also, in this embodiment, the gutter cover 51 is a solid concrete cover, but the material and shape are not limited to this. For example, the gutter cover may be made of metal or a metal lattice-like cover called a grating.

[0028] As shown in FIGS. 4 and 6 , when disposing the noise prevention device 1 between two adjacent gutter covers 51, 51 that have already been placed on the gutter main body 52, it is preferable to first sufficiently widen the gap between the two adjacent gutter covers 51, 51 (specifically, by a distance greater than the thickness of the first plate portion 11). Note that, at this time, both adjacent gutter covers 51, 51 may be moved, or only one of them may be moved. It is also preferable to sufficiently widen the gap between the two adjacent gutter covers 51, 51 and the side portion (upper side wall 58) of the gutter cover placement portion 56 (specifically, by a distance greater than the thickness (maximum thickness) t2 of the second plate portion 12). This prevents damage to the noise prevention device 1 when it is inserted between the two adjacent gutter covers 51, 51.

[0029] Next, as shown in Figures 4 and 6, the gap between two adjacent gutter covers 51, 51 is narrowed so that the first plate portion 11 is sandwiched between the two adjacent gutter covers 51, 51 (it is also possible to move both of the two adjacent gutter covers 51, 51, or to move only one of them).

[0030] The noise suppressor 1 of this embodiment can also be arranged in the following manner.

[0031] As shown in FIG. 7, a first gutter cover 51a is placed on opposing gutter cover mounting portions 56, 56 provided at the top of the gutter 50 (first gutter cover placing step). Next, one of the second plates 12 of the noise prevention device 1 is inserted between the first gutter cover 51a and the side portion (upper side wall 58) of the gutter cover mounting portion 56, and the first plate 11 is placed so that it faces the front surface of the first gutter cover 51a (the lower surface in FIG. 7) (noise prevention device placing step). Note that in this noise prevention device placing step, as shown in FIG. 5, it is preferable that the first plate 11 is placed obliquely so that the upper end of the side end of the first plate 11 that is separated from the second plate 12 is higher than the upper end of the second plate 12 of the noise prevention device 1, and that the upper end of the side end of the first plate 11 that is separated from the second plate 12 is positioned lower than the top surface of the first gutter cover 51a. Such an arrangement is achieved, for example, by a slope of the side of the gutter cover placing portion 56 (upper side wall 58) which is provided to make it easier to place the gutter cover 51 on the gutter cover placing portion 56, and a corresponding slope of the side of the gutter cover 51.

[0032] Next, as shown in Figure 8, the second gutter cover 51b (shown by a dashed line in Figure 8) is positioned so that the rear surface (upper surface in Figure 8) of the second gutter cover 51b (shown by a dashed line in Figure 8) faces forward (lower in Figure 8) of the first gutter cover 51a on which the noise prevention device 1 is placed, the first plate portion 11 of the noise prevention device 1 is positioned between the front surface of the first gutter cover 51a and the rear surface of the second gutter cover 51b, and the other second plate portion 12 of the noise prevention device 1 is between the second gutter cover 51b and the side portion (upper side wall 58) of the gutter cover mounting portion 56 (second gutter cover placement process).

[0033] By using the above-described steps (first gutter cover placement step, noise prevention device placement step, and second gutter cover placement step), it is possible to place noise prevention devices at the same time as placing the gutter cover, for example, when installing a new gutter.

[0034] The following are test results on the noise suppression effect of the noise prevention devices described above.

[0035] (Example) With the noise prevention devices installed on the gutter (the installation state of the noise prevention devices shown in Figure 4, with the noise prevention devices installed between all gutter covers), a vehicle was driven over the gutter in the direction of the gutter extension, and the maximum noise (unit: dB) while the vehicle was running was measured. The noise immediately before the vehicle started running was measured as background noise. This test (measurement of background noise and maximum noise while the vehicle was running) was conducted for three cycles. The measuring device used was a digital sound level meter (product number: 78588) manufactured by Shinwa Measurement Co., Ltd. The measuring device was placed 75 cm above the ground and 65 cm from the side edge of the gutter cover. The material used to make the noise prevention devices was the "8030" grade of "Milastomer (registered trademark)," an olefin-based thermoplastic elastomer manufactured by Mitsui Chemicals, Inc. The measurement results (unit: dB) are shown in Table 1.

[0036] (Comparative Example) The same test (measurement of background noise and maximum noise when a vehicle is running) was carried out for three cycles for the above-mentioned example without installing the noise prevention device on the road ditch. The measurement results (unit: dB) are shown in Table 1.

[0037] [Table 1]

[0038] According to the above test results (Table 1), the difference between background noise and noise (maximum noise when a vehicle is running) when noise prevention devices are installed (Examples) is 5.4 dB to 10.6 dB, whereas the difference between background noise and noise (maximum noise when a vehicle is running) when noise prevention devices are not installed (Comparative Examples) is 13.0 dB to 18.0 dB. This shows that installing noise prevention devices suppresses noise (an increase in noise from background noise) when a vehicle runs over a gutter.

[0039] 9 and 10 show another embodiment of the noise suppressor of the present invention. The main difference between these noise suppression devices 1 and the above-described noise suppression device 1 is the shape of the second plate portion. Unless otherwise specified, the noise suppression device 1 has substantially the same configuration as the above-described noise suppression device 1, and the same names and symbols are used for such configuration, and detailed explanations will be omitted.

[0040] 9, substantially the entire second plate portion 12a is a single wedge-shaped portion 13a whose thickness decreases in the direction in which the second plate portion 12a extends. In other words, the second plate portion 12a of the noise suppressor 1a does not have a step portion as described above. Specifically, the surface of the second plate portion 12a opposite to the first plate portion 11 is a flat surface 17 perpendicular to the direction in which the first plate portion 11 extends, and the surface of the wedge-shaped portion 13a of the second plate portion 12a facing the first plate portion 11 is a single inclined or curved surface (here, an arc-shaped surface) 20 that is inclined or curved so that the thickness of the second plate portion 12a decreases in the direction in which the second plate portion 12a extends.

[0041] 10 includes a second plate 12 extending from a side end of the first plate 11 in a direction perpendicular to the first plate 11. In other words, the noise prevention device 1b includes the second plate 12 extending from the side end of the first plate 11 in one direction (upward in FIG. 10) perpendicular to the first plate 11, and no second plate is provided in the other direction (downward in FIG. 10). This allows the noise prevention device 1b to be installed even in cases where the gutter main body is arranged to wrap around the corner of the gutter cover (for example, in FIGS. 4 and 6, a gutter wall portion is also provided on the front side of the gutter cover 51 (downward in FIG. 4 and 6)), or where a gap for placing the noise prevention device 1b (second plate 12) cannot be secured between one of two adjacent gutter covers and the side portion (upper part of the side wall) of the gutter main body. [Explanation of symbols]

[0042] 1,1a,1b Noise prevention equipment 11 1st plate part 12 2nd plate part 13 Wedge 14 First wedge 15 Step 16 Second wedge 17 Flat surface 18 First arcuate surface 19 Second arcuate surface 50 Gutter 51 Gutter Cover 52 Gutter body 56 Gutter cover placement section 58 Upper side wall

Claims

1. A noise prevention device disposed between two adjacent gutter covers, a first plate portion that can be arranged between the two adjacent gutter covers; a second plate portion extending from a side end of the first plate portion so as to be perpendicular to the first plate portion, A noise prevention device characterized in that a wedge-shaped portion whose thickness decreases toward the extension direction of the second plate portion is provided at the tip side portion of the second plate portion.

2. The noise prevention device according to claim 1 , further comprising a pair of second plate portions extending from side ends of the first plate portion so as to be perpendicular to the first plate portion.

3. A noise prevention device as described in claim 1 or 2, wherein the surface of the second plate portion opposite the first plate portion is a flat surface perpendicular to the extension direction of the first plate portion, and the surface of the wedge-shaped portion of the second plate portion facing the first plate portion is an inclined or curved surface that is inclined or curved so that the thickness of the second plate portion becomes thinner toward the extension direction of the second plate portion.

4. 3. The noise prevention device according to claim 1, wherein the second plate portion comprises: a first wedge-shaped portion extending from a base end of the second plate portion and having a thickness that decreases in the direction of extension of the second plate portion; a step portion connected to the tip of the first wedge-shaped portion; and a second wedge-shaped portion extending from the step portion and having a thickness that decreases in the direction of extension of the second plate portion.

5. a surface of the second plate portion opposite to the first plate portion is a flat surface perpendicular to the extending direction of the first plate portion, and the second plate portion has a thickness that is greatest at a base end of the first wedge-shaped portion, Furthermore, the surfaces of the first wedge-shaped portion and the second wedge-shaped portion facing the first plate portion are inclined or curved surfaces that are inclined or curved so that the plate thicknesses of the first wedge-shaped portion and the second wedge-shaped portion become thinner in the extension direction of the second plate portion.

6. 6. The noise prevention device according to claim 5, wherein the surfaces of the first wedge-shaped portion and the second wedge-shaped portion facing the first plate portion are first and second arc-shaped surfaces that curve so that the plate thicknesses of the first wedge-shaped portion and the second wedge-shaped portion become thinner in the extension direction of the second plate portion, and the radius of curvature R1 of the first arc-shaped surface is smaller than the radius of curvature R2 of the second arc-shaped surface.

7. 7. The noise suppressor according to claim 6, wherein a length L1 of the first wedge-shaped portion in the extending direction is longer than a length L2 of the second wedge-shaped portion in the extending direction.

8. The noise suppressor according to claim 1 or 2, wherein the noise suppressor has a substantially constant cross-sectional shape in a cross section perpendicular to the extending direction of the first plate portion.

9. 3. The noise suppressor according to claim 1, wherein the noise suppressor is made of rubber, elastomer, or resin.

10. 3. The noise suppressor according to claim 1, wherein the noise suppressor is made of weather-resistant rubber, elastomer, or resin.

11. The noise prevention device according to claim 4, wherein the noise prevention device is made of rubber or elastomer having a Shore A hardness of 75 to 85, and has a substantially constant cross-sectional shape in a cross section perpendicular to the extension direction of the first plate portion.

12. A noise prevention device that is placed between two adjacent gutter covers placed on the upper surfaces of opposing gutter cover placement parts provided on the upper part of a gutter body, and between the two adjacent gutter covers and the side parts of the gutter cover placement parts, a first plate portion that can be arranged between the two adjacent gutter covers; a pair of second plate portions extending from the side ends of the first plate portions so as to be perpendicular to the first plate portions, and capable of being arranged between the end side surfaces of the two adjacent gutter covers and the side portions of the gutter cover placing portion; Each of the pair of second plate portions includes a first wedge-shaped portion extending from a base end of the second plate portion and having a thickness that decreases in the extending direction of the second plate portion, a step portion connected to a tip end of the first wedge-shaped portion, and a second wedge-shaped portion extending from the step portion and having a thickness that decreases in the extending direction of the second plate portion, a surface of the second plate portion opposite to the first plate portion is a flat surface perpendicular to the extending direction of the first plate portion, and the second plate portion has a thickness that is greatest at a base end of the first wedge-shaped portion, Furthermore, the surfaces of the first wedge-shaped portion and the second wedge-shaped portion on the first plate portion side are inclined or curved surfaces that are inclined or curved so that the plate thicknesses of the first wedge-shaped portion and the second wedge-shaped portion become thinner toward the extension direction of the second plate portion, The noise prevention device is made of rubber or elastomer having a Shore A hardness of 75 to 85, and has a substantially constant cross-sectional shape in a cross section perpendicular to the width direction of the first plate portion.

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