JP3827631B2 - Sound absorbing plate and its mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound absorbing plate mounting structure provided on an underpass of an elevated road, a girder of an elevated railway and the like, and a sound absorbing plate used therefor.
[0002]
[Prior art]
In urban areas, the use of land is extremely serious, and how to effectively use limited land is also a very big proposition. For example, as shown in FIG. _In many cases, ₁ and the general road R ₂ are installed together to effectively solve the problem of traffic congestion.
[0003]
In this road structure, the sound wave generated from the vehicle passing through the lower general road R ₂ propagates directly above and reaches the back surface (rear portion) of the elevated structure of the highway R ₁ . At this time, as is well known, since the sound wave is a wave with air density, if it collides with an obstacle like other waves, it will be reflected at a regular angle. The reflected wave propagates to the houses and buildings along the road through the upper portion of the side wall W ₂ of the general road R ₂ as it is. This phenomenon can lead to a noise environment that is difficult for the residents around the road if the traffic volume increases, and it has been pointed out in many places.
[0004]
Under such traffic environment, in the hotel's road, with erecting a sound barrier W ₁ to the side of the highway R ₁ of the upper, upright soundproof wall W ₂ to the side surface of the open road R ₂ in the lower In addition to blocking the propagation of noise generated when passing through the vehicle at the side, a sound absorbing plate (sound absorbing wall) W ₃ is provided on the back of the highway R ₁ to block the acoustic reflected waves from the back of the elevated structure Or noise absorption to minimize the noise pollution on the residents of the highway network.
[0005]
The basic structure of the sound barriers (sound absorbing plates) W ₁ , W ₂ , W ₃ (hereinafter referred to as “W”) is that a sound absorbing layer made of glass wool or the like is formed in a flat box, and the box opening surface is made of a metal such as punching metal. It is housed in a perforated plate casing and absorbs sound by changing sound energy into heat energy by friction or the like in the sound absorbing layer.
[0006]
The mounting of the sound absorbing plate on the lower surface of the elevated road will be described with reference to FIG. 1 and FIG. 2h showing an embodiment of the present invention. In general, the sound absorbing plate 10 is fixed in parallel between the flanges 2 of the mounting beams 1 facing each other.
[0007]
As one of the mounting structures of the sound absorbing plate 10 to the mounting beam 1, mounting pieces are provided on both side plates of the sound absorbing plate 10, mounting pieces are also provided on the flange 2 of the mounting beam 1, and both mounting pieces are bolted. In some cases, a sound absorbing plate 10 is attached to the attachment beam 1. At this time, the bolt is fastened through the long holes of the both mounting pieces, and the movement of the bolt in the long hole causes the sound absorbing plate 10 to move in the bridge axial direction (in FIG. 1, the direction orthogonal to the paper surface) and the bridge. The mounting position error in the direction perpendicular to the axis is absorbed (see Patent Document 1).
[0008]
As another mounting structure, horizontal mounting pieces are provided on both side plates of the sound absorbing plate 10, the mounting pieces are locked to the upper surface of the flange 2 of the mounting beam 1, and the mounting piece and the back plate of the sound absorbing plate 10 are flanged. There is one in which a sound absorbing plate 10 is attached to the attachment beam 1 with 2 sandwiched therebetween (see Patent Document 2).
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-165721 FIG. 1 or FIG.
[Patent Document 2]
Japanese Patent Laid-Open No. 10-237822 FIG. 2 and FIG.
[0010]
[Problems to be solved by the invention]
In the prior art described in Patent Document 1, there is a case where the gap between the mounting beam 1 and the sound absorbing plate 10 becomes larger than necessary due to the presence of the mounting piece, which may cause a space problem. In addition, since the mounting piece is interposed, there may be a problem in strength.
[0011]
Since the prior art described in Patent Document 2 is due to the fitting of the flange 2 between the mounting piece and the back plate, there may be a problem in strength.
[0012]
It is an object of the present invention to have a limited mounting space and to be able to mount firmly.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention first bolts the sound absorbing plate directly to the mounting beam without using the mounting piece. If bolted directly, the gap between the mounting beam and the sound absorbing plate becomes as small as possible, which is advantageous in terms of space.
[0014]
Next, according to the present invention, the mounting position error is absorbed by the movement of the bolt in the long hole, and the error in the bridge axis direction is performed by the long hole of the sound absorbing plate, and the error in the direction perpendicular to the bridge axis is performed by the long hole of the mounting beam. I did it. The length of the flange of the mounting beam is perpendicular to the bridge axis, and it is easy to form a long hole in that direction, and there is little deterioration in strength due to the formation of the long hole. Similarly, it is easy to form a long hole in the length direction of the sound absorbing plate, and there is little deterioration in strength due to the formation of the long hole.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, a long square box-shaped sound absorbing plate is mounted on a mounting beam installed at a predetermined interval, and the sound absorbing plate is directly mounted by bolting with its length direction orthogonal to the mounting beam. In the structure, the fastening bolt is provided on the back plate of the sound absorbing plate so as to be slidable in the length direction of the sound absorbing plate, and a long hole through which the fastening bolt is inserted is provided in the length direction of the mounting beam. It is possible to adopt a structure in which a sound absorbing plate is attached to the mounting beam by forming, inserting the bolt into the elongated hole, screwing the nut, and fastening by the screwing.
[0016]
As the slide structure of the tightening bolt, for example, a long hole in the length direction is formed in the back plate of the sound absorbing plate, and this long hole is a fitting into which the head of the tightening bolt formed in the back part enters. It is possible to adopt a configuration comprising a portion and a locking portion having a width that prevents the fastening bolt head portion passing from the fitting portion toward the sound absorbing plate side plate from passing therethrough.
[0017]
In this configuration, a reinforcing piece extending integrally from the sound absorbing plate side plate to the long hole is provided on the back surface of the back plate, and the same long hole overlapping the long hole is formed in the reinforcing piece. In this case, the load from the tightening bolts bears not only the back plate but also the side plate via the reinforcing piece, and the side plate bears the load in the surface direction, so it is strong in strength. As a result, the sound absorbing plate is firmly attached to the attachment beam.
[0018]
Moreover, if the head of the fastening bolt is fitted on the back surface of the back plate of the sound absorbing plate or the back of the reinforcing piece and a non-rotating member that can slide in the length direction of the elongated hole is provided, Fastening work becomes easy.
[0019]
【Example】
Shows an embodiment in FIGS. 1 to 7, this embodiment is for constructing a sound-absorbing wall W ₃ by the sound absorbing plate 10 provided on the back surface of the highway bridge, its I digit H underside between piers Longitudinal beams 6 are appropriately provided along various lengths via various suspension members 5 (FIGS. 2a to 2e), and further, the transverse beams 1 for mounting the sound absorbing plate 10 are provided on the longitudinal beams 6 at appropriate intervals. Provided (FIG. 2f). In the flange 2 of the horizontal beam 1, long holes 7 for mounting the sound absorbing plate 10 are formed at appropriate intervals, and the long holes 7 are in the length direction of the horizontal beam 1.
[0020]
As shown in FIGS. 4 to 7, the sound absorbing plate 10 includes a back plate 11 having a U-shaped cross section having front and back plates, left and right side plates 12, a sound absorbing material 13 made of water-repellent glass wool, and a perforated hole having small holes on the surface. The rear plate 11, the side plate 12, and the front plate 14 are made of an aluminum plate. The back plate 11 is loaded with a sound absorbing material 13 and held by an aluminum partition plate 15 and a front plate 14.
[0021]
Mounting holes 18 for the fastening bolts 17 are formed on both sides of the back surface of the back plate 11, and nuts for fixing the drop-preventing eye bolts 19 to the inside thereof are fixed with rivets, and the sound absorbing plate 10 is attached to the horizontal beam 1. At this time, the sound absorbing plate 10 is prevented from falling by passing a wire rope through the eyebolt 19 screwed to the nut and tying it to the cross beam 1. The mounting hole 18 is a long hole in the length direction of the back plate 11, and its inner part 18 a is a fitting part that can fit the head 17 a of the bolt 17, and the fitting part 18 a From the side toward the side plate 12, the locking portion 18b has a width that prevents the head 17a from coming off. As shown in FIG. 8, the bolt 17 is formed by bending a steel plate to form a pedestal 17b. On the other hand, when forming a round bolt, a projection 17c is formed on the head 17a by a press or the like, and the pedestal is interposed via the projection 17c. 17b is spot welded to the head 17a. As long as the head 17a of the bolt 17 is prevented from turning, a commercially available square bolt or hexagon bolt can be used.
[0022]
The side plate 12 is attached to the back plate 11 by being fitted on the side surface and riveted, and reinforcing pieces 20 are provided so as to reach the mounting holes 18 from both sides of the back edge toward the back plate 11. A long hole 21 having the same shape as the mounting hole 18 is formed in the reinforcing piece 20, and when the side plate 12 is attached to the back plate 11, the long hole 21 exactly overlaps the mounting hole 18 on the same axis. The reinforcing piece 20 has an integral structure with the side plate 12 and is fixed to the back plate 11 with rivets. A locking member 22 having a fitting portion having a U-shaped cross section is fixed to the back plate 11 by a rivet. When the head 17a of the bolt 17 is fitted to the locking member 22, the bolt 17 is prevented from rotating. As the bolt 17 moves in the mounting hole 18 (long hole 21), the head 17a also slides in the anti-rotation member 22. The anti-rotation member 22 prevents the bolt 17 from dropping. In the figure, reference numeral 23 denotes a rubber for a sound absorbing plate spacer.
[0023]
In order to attach the sound absorbing plate 10 to the transverse beam 1, after the bolt 17 is attached to the back plate 11 via the attachment hole 18 (long hole 21) in the state where the transverse beam 1 shown in FIG. Then, the bolt 17 is lifted up to the horizontal beam 1 and the bolt 17 is inserted into the long hole 7 of the horizontal beam 1 and screwed into the nut 9 with a washer 8 interposed as appropriate. At this time, the bolt 17 is moved into the mounting hole 18 and the long hole 7 to absorb and adjust the positional deviation of the sound absorbing plate 10 with respect to the lateral beam 1 (FIG. 2g). By repeating this operation, a sound absorbing wall (soundproof wall) W ₃ shown in FIGS. 1 and 2 is formed. Further, as shown in FIG. 2 h, a wire (wire) 25 is laid across the cross beam 1 on the eyebolt 19 of each sound absorbing plate 10 to reliably prevent the sound absorbing plates 10 from falling. Between the sound absorbing plates 10, the sealing material 24 shown in FIGS. 3B and 5 is interposed over the entire length. The bolt 17 may be fitted into the mounting hole 18 after lifting the sound absorbing plate 10 to the cross beam 1.
[0024]
【The invention's effect】
According to the present invention, since the sound absorbing plate is directly attached to the attachment beam as described above, there is little restriction on the attachment space, and the sound absorption plate can be firmly attached.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of installation of a sound absorbing wall according to an embodiment. FIG. 2a is an operation diagram of the embodiment. FIG. 2b is an operation diagram. FIG. 2c is an operation diagram. FIG. 2f is the same action diagram. FIG. 2g is the same action diagram. FIG. 3 is a front view of the cutting main part. b) is a side view of the main part of the cutting. [FIG. 4] shows the sound absorbing plate, (a) is a front view, (b) is a bottom view, and (c) is a cutting front view. [FIG. A sectional view taken along line A [FIG. 6] A perspective view of the sound absorbing plate [FIG. 7] An exploded perspective view from below [FIG. 8] A fastening bolt of the same embodiment is shown, (a) is an exploded perspective view, (b) Front view [Explanation of symbols]
HI girder W ₁ , W ₂ , W ₃ Sound barrier 1 Mounting beam 2 Flange 7 Mounting beam slot 9 Nut 10 Sound absorbing plate 11 Back plate 12 Side plate 13 Sound absorbing material 14 Porous surface plate 17 Tightening bolt 17a Tightening bolt Head 18 mounting bolt mounting holes (long holes)
20 Reinforcing piece 21 Long hole 22 for tightening bolt mounting Non-rotating member

Claims (2)

The elongate rectangular box-shaped sound absorbing plate 10 to the mounting beam 1 placed at a predetermined distance to place its longitudinal direction by perpendicular to the mounting beam 1, the mounting beam 1 to Waso mounting beam 1 A long hole 7 which is long in the length direction is formed, and a nut 9 is inserted into the long hole 7 by inserting a fastening bolt 17 slidable in the length direction of the sound absorbing plate 10 into the back plate 11 of the sound absorbing plate 10. The sound absorbing plate 10 in the sound absorbing plate mounting structure in which the sound absorbing plate 10 is attached to the mounting beam 1 by screwing and fastening by the screwing ,
Above its length to the back plate 11 of the sound absorbing plate 10 to form a long hole 18, the long hole 18, a fitting portion 18a which the head 17a of the fastening bolt 17 that is formed in the back portion enters, The fastening bolt 18a from the fitting portion 18a toward the sound absorbing plate side plate 12 includes a locking portion 18b having a width that does not pass through the fitting bolt 18a.
Or One, the back surface of the back plate 11 of the sound absorbing plate 10, provided with a slidable detent member 22 in the longitudinal direction of the rotationally fixed the slots 18 heads 17a of the fastening bolt 17 is fitted Sound absorbing plate. A reinforcing piece 20 that extends integrally from the side plate 12 of the sound absorbing plate 10 to the long hole 18 is provided between the back surface of the back plate 11 of the sound absorbing plate 10 and the anti-rotation member 22. The sound absorbing plate according to claim 1, wherein the same long hole 21 overlapping the long hole 18 is formed.

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