JP2004156392A - Sound absorbing plate and its mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorbing plate and its mounting structure capable of lightening restriction on a mounting space of the sound absorbing plate 10 and being strongly mounted. <P>SOLUTION: A beam 1 is provided on a bridge, and the sound absorbing plate 10 is mounted to the beam 1 with a bolt 17 to be clamped. Then, the bolt 17 is made to pass through a slot 7 in the beam 1 and a slot 18 in the back plate 11 of the sound absorbing plate 10, and the bolt 17 moves inside of the slots 7 and 18 to absorb positional shift. The sound absorbing plate 10 is directly mounted to the beam 1 to save the space, and the restriction can be lightened. A reinforcing piece 20 is put to the slot 18 on the side of the sound absorbing plate 10 to reinforce, and a whirl-stop member 22 is provided on the lower surface thereof to execute the turning stop and falling prevention of the bolt 17. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing plate mounting structure provided on an underpass or the like of an elevated road or an elevated railway, and a sound absorbing plate used for the structure.
[0002]
[Prior art]
In urban areas, the use of land is extremely severely restricted, and how to use the land effectively is also a very important proposition. For example, as shown in FIG. ₁ and the general road R ₂ and effectively often solve the case the problems of traffic congestion and features a.
[0003]
This road structure, waves generated from the vehicle passing through the lower open road R ₂ is also propagated directly above, also reaches the rear surface of the elevated structure of the highway R ₁ (rear part). At this time, as is well known, the sound wave is a wave with air density, so if it hits an obstacle like other waves, it will be reflected at a regular angle. reflected housing along its reflected wave beyond the top of the open road R ₂ of the side wall W ₂ road, the property of propagating the buildings appear intact. This phenomenon may lead to a noise environment that cannot withstand the residents around the road if the traffic volume increases, and has been pointed out in many places in reality.
[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 and not only blocked by the side surface of the propagation of the noise generated when the vehicle passes, the back surface of the highway R ₁ provided a sound-absorbing plate (sound-absorbing walls) W _3, blocking the acoustic wave reflected from elevated structure back surface In addition, it absorbs and reduces noise pollution on residents around the expressway network as much as possible.
[0005]
The basic configuration of the soundproof wall (sound absorbing plate) W ₁ , W ₂ , W ₃ (hereinafter, W) is such that a sound absorbing layer made of glass wool or the like is formed in a flat box, and the opening surface of the box is made of metal such as punching metal. It is housed in a casing made of a perforated plate, and converts sound energy into heat energy by friction or the like in the sound absorbing layer to absorb sound.
[0006]
The mounting of the sound absorbing plate on the underside of the elevated road will be described with reference to FIGS. 1 and 2h showing an embodiment of the present invention. Generally, the sound absorbing plates 10 are fixed in parallel between the flanges 2 of the mounting beams 1 opposed to 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 together. In some cases, a sound absorbing plate 10 is attached to an attachment beam 1. At this time, the bolts are fastened through the long holes of both mounting pieces, and the movement in the long holes of the bolts causes the bridge axis direction of the sound absorbing plate 10 with respect to the mounting beam 1 (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, and the mounting pieces are locked on the upper surface of the flange 2 of the mounting beam 1. There is one in which a sound absorbing plate 10 is attached to an attachment beam 1 while holding the sound absorbing plate 2 (see Patent Document 2).
[0009]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-165721 FIG. 1 or FIG.
[Patent Document 2]
SUMMARY OF THE INVENTION FIGS. 2 and 3
[0010]
[Problems to be solved by the invention]
In the prior art described in Patent Document 1, the gap between the mounting beam 1 and the sound absorbing plate 10 becomes unnecessarily large due to the presence of the mounting piece, which may cause a space problem. In addition, since the mounting piece is interposed, a problem may occur in strength.
[0011]
In the related art described in Patent Document 2, since the flange 2 is fitted between the mounting piece and the back plate, a problem may occur in strength.
[0012]
SUMMARY OF THE INVENTION It is an object of the present invention to reduce the restriction on the mounting space and to enable the mounting to be performed firmly.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention first bolts the sound absorbing plate directly to the mounting beam without the intervention of the mounting piece. If the bolts are directly tightened, 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, 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 direction 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 strength deterioration 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 in that direction, and there is little strength deterioration due to the formation of the long hole.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
According to an embodiment of the present invention, there is provided a mounting method of a sound absorbing plate in which a long rectangular box-shaped sound absorbing plate is directly mounted on a mounting beam installed at a predetermined interval by bolting with its length direction orthogonal to the mounting beam. In the structure, the fastening bolt is provided on the sound absorbing plate back plate so as to be slidable in the length direction of the sound absorbing plate, and the mounting beam is provided with a long hole through which the fastening bolt is inserted in the length direction of the mounting beam. It is possible to adopt a structure in which the nut is screwed by inserting the bolt into the elongated hole, and the sound absorbing plate is attached to the attachment beam by fastening by the screwing.
[0016]
As the slide structure of the tightening bolt, for example, a long hole in the longitudinal direction is formed in the back plate of the sound absorbing plate, and the long hole is fitted with a head of the tightening bolt formed in the back. It is possible to adopt a configuration including a portion and a locking portion having a width through which the head portion of the tightening bolt from the fitting portion to the sound absorbing plate side plate does not pass.
[0017]
In this configuration, on the back surface of the back plate, there is provided a reinforcing piece extending from the side plate of the sound absorbing plate to the long hole, and the reinforcing piece has the same long hole overlapping the long hole. In this case, the load from the tightening bolts is carried not only by the back plate but also by the side plates through the reinforcing pieces, and the side plates bear the load in the surface direction, so that the strength is strong. As a result, the sound absorbing plate is firmly attached to the mounting beam.
[0018]
In addition, if a head member of the tightening bolt is fitted on the back surface of the sound absorbing plate back plate or the back surface of the reinforcing piece, and a non-rotatable detent member is provided that can slide in the length direction of the long hole, the bolt is used. 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 Vertical beams 6 are appropriately provided along the length direction via various hanging members 5 (FIGS. 2A to 2E). Further, the horizontal beams 1 for mounting the sound absorbing plate 10 are provided on the vertical beams 6 at appropriate intervals. (FIG. 2f). In the flange 2 of the cross beam 1, long holes 7 for mounting the sound absorbing plate 10 are formed at appropriate intervals, and the long holes 7 extend in the length direction of the cross beam 1.
[0020]
As shown in FIGS. 4 to 7, the sound absorbing plate 10 includes a back plate 11 having front and rear front plates and a U-shaped cross section, left and right side plates 12, a sound absorbing material 13 made of water-repellent glass wool, and a perforation having small holes opened in the surface. The back plate 11, the side plates 12, and the surface plate 14 are made of an aluminum plate. The back plate 11 is loaded with the sound absorbing material 13 and is held by the aluminum partition plate 15 and the front plate 14.
[0021]
Mounting holes 18 for tightening bolts 17 are formed on both sides of the rear surface of the rear plate 11, and nuts for screwing the drop prevention eye bolts 19 are fixed by rivets inside the mounting holes 18, and the sound absorbing plate 10 is mounted on the cross beam 1. At this time, a wire rope is passed through an eyebolt 19 screwed to the nut and tied to the cross beam 1 to prevent the sound absorbing plate 10 from dropping. The mounting hole 18 is a long hole in the longitudinal direction of the back plate 11, and the inner part (inside) 18 a is a fitting part large enough to fit the head 17 a of the bolt 17, and the fitting part 18 a The locking portion 18b has a width such that the head portion 17a does not come off from the front side toward the side plate 12. 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 a round bolt is formed, a projection 17c is formed on the head 17a by pressing or the like, and the pedestal is formed via the projection 17c. 17b is manufactured by spot welding to the head 17a. As long as the head 17a of the bolt 17 is prevented from rotating, a commercially available square bolt or hexagon bolt can be used.
[0022]
The side plate 12 is attached to the back plate 11 by fitting to the side surface of the back plate 11 and riveting, and a reinforcing piece 20 extending from both sides of the back edge toward the inside of the back plate 11 is provided so as to reach the mounting hole 18. An elongated hole 21 having the same shape as the mounting hole 18 is formed in the reinforcing piece 20. When the side plate 12 is mounted on the back plate 11, the elongated hole 21 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 detent member 22 having a U-shaped cross section is fixed to the back plate 11 by rivets, and the head 17a of the bolt 17 is fitted into the detent member 22 to prevent the bolt 17 from turning. As the bolt 17 moves in the mounting hole 18 (elongated hole 21), the head 17a also slides in the detent member 22. The detent member 22 also prevents the bolt 17 from falling. In the figure, reference numeral 23 denotes a rubber for a spacer between sound absorbing plates.
[0023]
In order to attach the sound absorbing plate 10 to the cross beam 1, in a state where the cross beam 1 shown in FIG. 2F is provided, the bolt 17 is attached to the back plate 11 through the attachment hole 18 (the long hole 21), , The bolt 17 is inserted into the elongated hole 7 of the cross beam 1, and is screwed into the nut 9 with a washer 8 interposed therebetween for fastening. At this time, the bolt 17 is moved into the mounting hole 18 and the elongated hole 7 to absorb and adjust the displacement of the sound absorbing plate 10 with respect to the cross beam 1 (FIG. 2g). Repeat this process, FIG. 1, shown in FIG. 2, constituting the sound absorbing wall (sound barrier) W _3. In addition, as shown in FIG. 2h, a wire (number line) 25 is wrapped around the eye bolt 19 of each sound absorbing plate 10 so as to straddle the cross beam 1, so that each sound absorbing plate 10 is reliably prevented from falling. A sealing material 24 shown in FIGS. 3B and 5 is interposed between the sound absorbing plates 10 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 mounted on the mounting beam as described above, there is little restriction on the mounting space, and the mounting can be performed firmly.
[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 of FIG. 2c. FIG. 2d is an operation diagram of FIG. FIG. 2f is an operation diagram of FIG. 2g. FIG. 2h is an operation diagram of FIG. 2h. FIG. 2h is an operation diagram of the same embodiment. FIG. FIG. 4 (b) is a front view, FIG. 4 (b) is a bottom view, and FIG. 4 (c) is a cut front view. FIG. 6 is a perspective view of the sound absorbing plate. FIG. 7 is an exploded perspective view of the same from below. FIG. 8 shows a tightening bolt of the embodiment. FIG. Front view [Explanation of reference numerals]
H I girder _{W 1,} W 2, _{W 3} soundproof wall 1 attached beam 2 flange 7 mounted beam of the slot 9 a nut 10 acoustical panel 11 back panel 12 side plates 13 sound absorbing material 14 perforated face sheet 17 fastening bolt 17a fastening bolt Head 18 of the mounting bolt mounting hole (long hole)
Reference Signs List 20 Reinforcement piece 21 Tightening bolt mounting long hole 22 Detent member

Claims (4)

In the mounting structure of the sound absorbing plate 10 in which a long rectangular box-shaped sound absorbing plate 10 is mounted directly on the mounting beam 1 installed at a predetermined interval by fastening the bolt 17 with its length direction orthogonal to the mounting beam 1,
The fastening bolt 17 is provided on the sound absorbing plate back plate 11 so as to be slidable in the longitudinal direction of the sound absorbing plate 10, and the mounting beam 1 is provided with a long hole 7 through which the fastening bolt 17 is inserted. A sound absorbing plate mounting structure in which the nut 17 is screwed into the elongated hole 7 through the bolt 17 and the nut 9 is screwed in, and the sound absorbing plate 10 is mounted on the mounting beam 1 by fastening by screwing. A long hole 18 in the longitudinal direction is formed in the back plate 11 of the sound absorbing plate, and the long hole 18 is fitted with a fitting portion 18a into which a head 17a of a tightening bolt 17 formed in a back portion enters. A locking portion 18b having a width through which the tightening bolt head 17a does not pass through from the portion 18a to the sound absorbing plate side plate 12, and the back surface of the back plate 11 is integrally formed with the sound absorbing plate side plate 12 from the sound absorbing plate side plate 12. The mounting structure of the sound absorbing plate according to claim 1, wherein a reinforcing piece (20) extending to the elongated hole (18) is provided, and the reinforcing piece (20) has the same elongated hole (21) overlapping the elongated hole (18). The head 17a of the tightening bolt 17 fits on the back of the sound absorbing plate back plate 11 according to claim 1 or the back of the reinforcing piece 20 according to claim 2, and the length of the slots 18 and 21 is non-rotatably. The mounting structure for a sound absorbing plate according to claim 1, further comprising a detent member slidable in a direction. The sound absorbing plate according to claim 3.

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