JP2013053447A - Sound absorbing component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorbing component which prevents a vehicle from coming in contact with a sound absorbing body so as to improve running safety.SOLUTION: A sound absorbing component 10 installed at the top of a sound-insulating wall erected in the direction of travel along a road is provided with a sound absorber 13 lying between a perforated plate 11 covering the outer surface and an inner face plate 12 constituting the inside face and a sound absorbing body 14 which has an approximately U-shaped cross section. The sound absorbing body 14 is arranged such that the top of the sound-insulating wall is held by both of the ends of the approximately U-shaped cross section, having a first side wall 16a facing the road side and a second side wall 16b facing the outside which are raised upward from both of the ends, respectively, and a top head part 17 having an approximately arc shaped cross section. The first side wall 16a extends in approximately vertical direction. The second side wall 16b is swollen outward from the top head part 17, folded inward in an arc shape from the outwardly swollen end 51, and then further folded downward.

Description

  The present invention relates to a sound absorbing member provided at the top of a sound insulating wall for preventing noise caused by a traveling vehicle on an expressway or the like.

  On a highway or the like, a large noise is generated as the vehicle travels at a high speed, and the environment around the road is damaged. For this reason, in order to prevent the noise etc. which generate | occur | produces with driving | running | working of a vehicle from leaking outside, providing the sound insulation wall in the both sides of a road is generally performed. In many cases, the sound insulating walls are provided with support columns at predetermined intervals in the vehicle traveling direction, and a sound insulation panel is stacked between adjacent columns to form a wall structure.

  Traffic noise due to vehicle travel in the case where a sound insulation wall is provided is evaluated for sound insulation performance based on the transmitted sound that passes through the sound insulation wall itself and the diffracted sound that travels around the top of the sound insulation wall and re-radiates toward the sound receiving point. If the sound insulation performance of the sound insulation wall itself is sufficient, the noise level at the sound receiving point is determined by the diffracted sound. In order to reduce this diffracted sound, it is possible to reduce the noise level at the sound receiving point by reducing the acoustic energy concentrated at the top of the sound insulation wall. Conventionally, in order to improve the sound insulation performance, a technique for attaching a sound absorbing member to the top of the soundproof wall has been proposed.

  In the technique disclosed in Patent Document 1, a technique is proposed in which a cylindrical sound-absorbing tube made of a ceramic sound-absorbing material is attached to the upper end of the sound-proof wall main end. The technique disclosed in Patent Document 1 discloses that even if the height of the soundproof wall is lowered, the amount of sound wave diffraction can be reduced by the cylindrical sound absorbing cylinder.

  FIG. 10 shows an example of a sound absorbing device for a sound insulating wall shown in Patent Document 2. The sound absorbing device for sound insulation wall 7 is formed by forming a sound absorbing body 74 constituted by sandwiching a sound absorbing material 73 made of an inorganic fiber mat or porous ceramics between an inner surface plate 72 and an outer porous plate 71. . The sound absorber 74 is formed from a lower wall portion 75 extending in the vertical direction, a flange portion 76 that bulges in a semicircular cross section from the upper portion of the lower wall portion 75 to the side, and an upper end of the flange portion 76. It is comprised with the elongate material which consists of the substantially convex-arc-shaped top wall part 77 formed. A fixing portion 79 such as a bracket fixed to the lower end of the inner surface plate 72 with a screw or the like is provided inside the lower wall portion 75. A closing plate 81 is fixed to the end surface 80 of the top wall 77 with screws or the like.

  The sound absorbing wall sound absorbing device 7 is attached via bolts 86 and 87 after the fixing portion 79 is brought into contact with the metal plates 83 and 84 constituting the sound insulating wall. In the disclosed technique of Patent Document 2, the mounting structure to the sound insulation wall is improved, and the ease of mounting is improved.

  FIG. 11 shows a mounting structure 9 for the sound absorbing body 91 at the top of the sound insulating wall shown in Patent Document 3. The structure of the sound absorber 91 is substantially the same as that of the above-described sound absorber 74 except that the sound absorber 91 is formed of a single long material. The mounting structure 9 has an outer mounting rail 97 composed of an upper side portion having an inverted L-shaped cross section and a lower side portion having an inverted F-shaped cross section, and a lower side portion having an inverted L-shaped cross section. An inner mounting rail 98 provided with a protruding step is attached to the sound insulation wall 90, and an outer fixed rail 101 and an inner fixed rail 102 are provided for the sound absorber 91, and the outer fixed rail 101 is connected to the outer mounting rail 97. In addition, the inner fixed rail 102 is inserted into the inner mounting rail 98. That is, in the disclosed technique of Patent Document 3, the mounting structure to the soundproof wall is further improved as compared with the disclosed technique of Patent Document 2.

Japanese Utility Model Publication No. 03-108012 Japanese Patent Laid-Open No. 06-235209 JP-A-10-237830

  However, all of the disclosed technologies disclosed in Patent Documents 1 to 3 are configured such that the sound absorber attached to the top of the sound insulation wall bulges sideways toward the road side. For this reason, a building limit will be set more narrowly according to the bulging part to the road side by this sound-absorbing body. For this reason, if the vehicle deviates from the exact direction of travel and the tire contacts the curb at the bottom of the sound insulation wall, the vehicle will abnormally approach the sound insulation wall, especially in the case of large vehicles such as trucks, As a result, the sound absorbing body may approach the side bulging portion.

  Further, in the curve section, as shown in FIG. 12, the crossing gradient θ becomes high, and the vehicle 130 traveling according to this becomes inclined, so that a large vehicle such as a truck accidentally approaches the soundproof wall by mistake. In the case where the sound absorbing member 131 is stuck, there is a possibility that the sound absorbing member 131 may come into contact with the bulging portion 132.

  In addition, the shape in which the sound absorbing body bulges out in the road sometimes gives a feeling of pressure to the driver of the vehicle.

  Furthermore, in the conventional sound absorber 91, the portion A is gradually tapered downward as shown in FIG. As a result, when heavy rain falls, there is also a problem that rainwater accumulates in the portion A from the bulging portion.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to absorb sound even when a large vehicle such as a truck accidentally approaches the soundproof wall. An object of the present invention is to provide a sound absorbing member capable of improving the safety of traveling by preventing contact with the body.

  In order to solve the above-mentioned problems, the present inventor can be disposed so as to sandwich the top of the sound insulating wall at both ends of the sound absorbing member having a substantially U-shaped cross section, and upward from each of the both ends. A first side wall and a second side wall that are raised, and a top having a substantially arc-shaped cross section that is continuous from both the first side wall and the second side wall, and a second side wall Is inflated to the outside of the cross section from the first side wall, and preferably a sound absorbing member in which the first side wall is extended in a substantially vertical direction.

  The sound-absorbing member according to claim 1 is a sound-absorbing member provided at the top of a sound insulation wall erected along the road traveling direction, between the perforated plate covering the outer surface and the inner surface plate constituting the inner surface. And a sound absorber that has a substantially U-shaped cross section, and the sound absorber can be disposed so as to sandwich the top of the sound insulating wall at both ends of the substantially U-shaped cross section. The first side wall facing the road side and the second side wall facing the outside, which are raised upward from the both ends, respectively, and the cross section that is continuous from both the first side wall and the second side wall. And the first side wall extends in a substantially vertical direction, and the second side wall bulges outward from the parietal portion and bulges to the outside. After it is bent in an arc from the bulging end, it is further bent downward. Characterized in that it comprises.

  According to a second aspect of the present invention, in the sound absorbing member according to the first aspect, the second side wall is thinned toward the end portion, and the first side wall has substantially the same thickness. It is characterized by that.

  According to the present invention having the above-described configuration, the first side wall facing the road side extends upward in a substantially vertical direction, and is configured to bulge outward like the second side wall. Not. For this reason, it is possible to reduce the diffracted sound that travels around the top of the sound insulation wall and re-radiates to the sound receiving point side while ensuring a wider building limit according to the amount of the first side wall not bulging to the road side. It becomes possible. In particular, even when a vehicle such as a truck deviates from the normal traveling direction and abnormally approaches the sound insulation wall, the vehicle can be prevented from coming into contact with the sound absorbing member.

  In addition, according to the present invention, since the first side wall is vertically extended without causing the first side wall to bulge sideways, the driver of the vehicle does not feel a feeling of pressure, and the vehicle moves forward when traveling. Increased attention is expected. According to the present invention, since the second side wall is configured to bulge to the side as in the conventional case, the landscape from the outside is not significantly changed, and the conventional landscape can be maintained. Become.

It is a top view of the sound insulation wall to which this invention is applied. It is a sectional side view of the sound insulation wall to which the present invention is applied. It is a perspective view of a sound absorbing member to which the present invention is applied. (A) is a side view of the sound absorbing member to which the present invention is applied, and (b) is a side sectional view of the sound absorbing member to which the present invention is applied. It is a front view of the sound-absorbing member to which the present invention is applied. It is an expanded sectional view of each fixture provided with a sound absorbing member. It is a front view of each fixture provided with a sound absorbing member. It is a figure which shows the example which attached the sound-absorbing member to the upper end of the sound insulation wall (sound insulation panel). It is a figure for demonstrating the effect of the sound absorption member to which this invention is applied. It is a figure which shows the example of the sound-absorbing device for sound-insulating walls shown in patent document 2. It is a figure which shows the attachment structure of the sound-absorbing body of the sound-insulating wall top shown to patent document 3. FIG. It is a figure which shows the state where the crossing gradient (theta) became high in the curve area, and the vehicle which drive | works according to this inclined.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings with respect to a sound insulation wall installed upright on a road median or a roadside part of a road, railway, or the like.

  FIG. 1 is a perspective view of a sound insulation wall 1 to which the present invention is applied, and FIG. 2 is a side sectional view of the sound insulation wall 1.

  The sound insulation wall 1 is erected along the road traveling direction, and includes a column 3 erected at a predetermined interval on a concrete base 2 and a sound insulation panel 4 attached between the columns 3. A sound absorbing member 10 is provided at the upper end of the sound insulating wall 1.

  The support | pillar 3 consists of H-section steel in which a pair of flange part was provided in a row by the both ends of the web part.

  The sound insulation panel 4 is a panel attached between the columns 3 and provided with a sound insulation function so that noise transmitted directly from the vehicle traveling on the roadway can be sound-insulated. The sound insulation panel 4 may be composed of a panel in which steel pipes having a rectangular cross section made of thin plates are arranged, or may be composed of a concrete plate. The sound insulation panel 4 may be configured as a panel in which known sound absorbing materials are arranged.

  As shown in the perspective view of FIG. 3, the side view of FIG. 4 (a), the side sectional view of FIG. 4 (b), and the front view of FIG. A sound absorber 14 having a sound absorbing material 13 interposed between the inner surface plate 12 constituting the inner surface is provided.

  The perforated plate 11 is made of a resin or metal plate regularly or irregularly provided with a large number of sound absorbing holes 18, and sound waves of traffic noise from the road side are transmitted through the through holes. It is set as the structure which can inject. The perforated plate 11 plays a role of preventing the sound absorbing material 13 filled therein from being scattered outside.

  The sound absorbing material 13 is selected from, for example, glass wool, inorganic fiber material, organic fiber material, metal fiber material, porous ceramic material, and the like, and all have a function of reducing incident acoustic energy.

  Further, the inner surface plate 12 is made of a metal plate and plays a role of holding the sound absorbing material 13 so as not to scatter from the perforated plate 11. Further, the inner surface plate 12 may be configured such that an inscribed plate 36 inscribed inside thereof protrudes from one side end.

  A sound absorbing member 14 is formed by interposing a sound absorbing material between the porous plate 11 and the inner surface plate 12 and forming the sound absorbing member 14 in a substantially U-shaped cross section. The sound absorber 14 includes end portions 15a and 15b, first side walls 16a and second side walls 16b raised upward from the end portions 15a and 15b, and first and second side walls 16a and 16b. A top portion 17 having a substantially arc-shaped cross section continuous from both sides 16b is formed.

  The first side wall 16a extends from the end 15a upward in a substantially vertical direction. On the other hand, as shown in FIG. 4, the second side wall 16 b is bulged outward from the crown portion 17, and is bent inward in an arc from the bulging end 51 bulged outward. Further, it is bent downward. That is, the second side wall 16b only needs to bulge to the outer side of the cross section than the first side wall 16a, and the first side wall 16a is similarly bulged to the outer side of the cross section. Alternatively, the shape may be recessed toward the inside of the cross section.

  The second side wall 16b has a shape that is gradually thinned toward the end 15b. On the other hand, the first side wall 16 a has substantially the same thickness from the end 15 a to the crown 17.

  Further, according to the present invention, as an attachment mechanism to the upper end of the sound insulation wall 1 (sound insulation panel 4), a metal outer fixed rail 21 is attached to the inner cavity 20 side of the second side wall 16b. A metal road side fixed rail 22 is attached to the inner wall 20 side and the lower end of one side wall 16a.

  As shown in FIG. 4B, the outer fixed rail 21 is fixed to the second side wall 16b via a bolt, a screw or the like at the central contact step 25, and is bent to the lumen 20 side at the lower part. A first bent step portion 26 is provided which is further bent downward after being formed. In addition, a second bent step having a substantially U-shaped cross section is formed at the upper portion of the contact step portion 25 and is bent upward further after being bent toward the lumen 20 and further bent toward the second side wall 16b. A portion 27 is provided.

  The road side fixed rail 22 is comprised with the metal piece bent by the cross-sectional substantially L shape as shown in FIG.4 (b). The road side fixed rail 22 is fixed to the end portion 15 of the first side wall 16a via bolts, screws, or the like. In the road side fixed rail 22, long holes 29 are formed at predetermined intervals.

  Further, a side plate 58 is provided at the side end of the sound absorbing member 10 as shown in FIGS. 3 and 4A. Bolt holes 19 are formed in the side plate 58 so that the perforated plate 11 or the inner surface plate 12 and the side plate 58 can be bolted together. Further, the side plates 58 may be brought into contact with each other adjacent to the sound absorbing member 10 and the inscribed plate 36 may be fixed in contact with the inner surface plate 12 of the other adjacent sound absorbing member 10.

  FIG. 6 is an enlarged cross-sectional view of each attachment device provided with the sound absorbing member 10 having the above-described configuration, and FIG. 7 is a front view thereof. First, a fixing device 30 is attached to the column 3. The fixing device 30 has a U-shaped cross section, and the flange 30a on the road side is attached to the flange 3a of the column 3 via bolts and nuts. The outer mounting rail 31 is attached to the outer flange 30b of the fixing device 30 via a bolt 42, and the road side mounting rail 32 is connected to the road-side flange 30a of the fixing device 30 via a bolt 43. Attached.

  Both the outer side mounting rail 31 and the road side mounting rail 32 are constructed so as to be installed between the fixing devices 30 attached to the adjacent columns 3. And this outer side mounting rail 31 consists of a cross-section inverted L-shaped upper side part and a cross-section inverted inverted F-shaped lower side part, and the groove part enclosed by the metal plate is especially formed in this lower side part. Further, as shown in FIG. 6, the road-side mounting rail 32 protrudes in the road direction, and its tip is bent downward.

  The outer mounting rail 31 is formed with a plurality of punched holes 45 at predetermined intervals. In addition, a plurality of long holes 46 are formed in the road-side mounting rail 32 at predetermined intervals.

  FIG. 8 shows an example in which the sound absorbing member 10 is actually attached to the upper end of the sound insulating wall 1 (sound insulating panel 4). When the sound absorbing member 10 is actually attached, the first bent step portion 26 of the outer fixed rail 21 is fitted into the groove portion 38 to fix the vertical position. The outer mounting rail 31 is adjusted so that the upper surface of the upper side portion of the inverted L-shaped section and the upper surface of the second bent step portion 27 are flush with each other by the joint bar 55. It is fixed by fitting.

  Further, the long hole 46 of the road-side mounting rail 32 and the long hole 29 of the road-side fixing rail 22 are aligned with each other and screwed and fixed by screwing means such as bolts.

  As a result, the sound absorbing member 10 can be disposed on the sound insulating wall 1 so that the first side wall 16a is on the road side and the second side wall 16b is on the outside. That is, by adopting the above-described configuration, the sound absorber can be disposed so as to sandwich the top portion of the sound insulating wall at both end portions having a substantially U-shaped cross section.

  Incidentally, for example, the technique disclosed in Patent Document 3 may be applied to the attachment of the sound absorbing member 10 to the upper end of the sound insulating wall 1 (sound insulating panel 4).

  In the present invention, by attaching the sound absorbing member 10 to the upper end of the sound insulating wall 1 (sound insulating panel 4) in this way, it is possible to reduce the diffracted sound that revolves around the top of the sound insulating wall and re-radiates toward the sound receiving point. By reducing the acoustic energy concentrated at the top of the sound insulation wall, it is possible to reduce the noise level at the outer sound receiving point. For this reason, even if the height of the sound insulation wall 1 is lowered, it is possible to reduce the diffraction amount of the sound wave by attaching the sound absorbing member 10.

  In addition to this, the present invention is configured such that the first side wall 16a facing the road is extended in a substantially vertical direction upward, and bulges outward like the second side wall 16b. Not. For this reason, as shown in FIG. 9, the building limit is set wider according to the amount of the first side wall 16 a that does not bulge to the road side by the sound absorbing member 10. In particular, even when the vehicle 61 such as a truck deviates from the accurate traveling direction and abnormally approaches the sound insulation wall 1, the vehicle 61 can be prevented from coming into contact with the sound absorbing member 10. In particular, when the crossing gradient θ becomes high as in a curve section, there is a remarkable effect when the inclination of the vehicle 61 such as a truck becomes large. Specifically, if the cross slope is 5% or less, even when a vehicle such as a truck touches the curb at the lower part of the sound insulation wall 1, damage due to contact with the sound absorbing member 10 can be prevented. Become.

  In addition, according to the present invention, the first side wall 16a is extended vertically up and down without causing the first side wall 16a to bulge sideways. It is expected that attention will be increased. In addition, according to the present invention, the second side wall 16b is configured to bulge to the side as in the conventional case, so that the landscape from the outside does not change significantly and the conventional landscape can be maintained. It becomes.

  Further, according to the present invention, the second side wall 16b is thinned toward the end portion 15b, and the first side wall 16a has substantially the same thickness. Therefore, it is possible to uniformly fill the sound absorbing material 13 particularly with respect to the first side wall 16a, and it is also possible to increase the amount of the sound absorbing material to be filled. In particular, since the first side wall 16a faces the road side, the sound wave propagating from the road side can be absorbed by more sound absorbing materials 13. As a result, even if the sound absorbing member 10 of the present invention that contributes to the reduction of diffracted sound is mounted in place of the uppermost sound insulation panel 4, there is no concern about the deterioration of the sound absorbing performance, and the noise on the sound receiving point side can be reduced.

  Further, in the present invention, since the first side wall 16a extends substantially vertically in the vertical direction, the first side wall 16a does not taper downward, and rainwater is not lost even when heavy rain falls. It is possible to flow smoothly without accumulating inside.

  In the above description, the case where the first side wall 16a is extended substantially vertically in the vertical direction has been described as an example. However, the present invention is not limited to such a configuration, and the second side wall 16b is the first side wall 16b. If the first side wall 16a is not bulged to the outside of the cross section from the first side wall 16a, in other words, if the first side wall 16a is restrained to bulge laterally from the second side wall 16b, Of course, the effects of the period can be obtained.

DESCRIPTION OF SYMBOLS 1 Sound insulation wall 2 Base 3 Support | pillar 4 Sound insulation panel 10 Sound absorption member 11 Porous plate 12 Inner surface plate 13 Sound absorption material 14 Sound absorption body 15a, 15b End part 16a 1st side wall 16b 2nd side wall 17 Top part 18 Sound absorption hole 19 Bolt hole 20 Inside Cavity 21 Outer fixed rail 22 Road side fixed rail 25 Contact step portion 26, 27 Bending step portion 29 Long hole 30 Fixing device 31 Outer mounting rail 32 Road side mounting rail 38 Groove portion 41, 42, 43 Bolt 45 Hole 46 Long hole 55 Joint bar 58 Side plate 61 Vehicle

Claims (2)

In the sound absorbing member provided at the top of the sound insulation wall erected along the road traveling direction,
A sound absorber is provided between the perforated plate covering the outer surface and the inner surface plate constituting the inner surface, and a sound absorber formed in a substantially U-shaped cross section,
The sound absorber can be disposed so as to sandwich the top portion of the sound insulation wall at both ends having a substantially U-shaped cross section, and faces the road side raised upward from each end. A second side wall facing the side wall and the outer side, and a top having a substantially arcuate cross section continuous from both the first side wall and the second side wall;
The first side wall is extended in a substantially vertical direction,
The second side wall bulges outward from the top of the head, and is bent inward in an arc shape from a bulging end bulged outward, and then further bent downward. Sound absorbing member. The sound absorbing member according to claim 1, wherein the second side wall is thinned toward an end portion, and the first side wall has substantially the same thickness.

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