JP2835024B2 - Noise barrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a soundproof wall installed on a side of a road or a railway line.

[0002]

2. Description of the Related Art A sound insulating wall installed on the side of a road or a railway line is a sound insulating wall or a sound absorbing sound insulating wall formed by dropping a sound insulating panel between pillars made of H-shaped steel (both are simply referred to as "sound insulating walls" in this specification). ) Is common. However, in such a sound-insulating wall having a simple structure, the height of the sound-insulating wall must be increased in order to enhance the soundproofing effect, which may cause problems such as hindering surrounding sunshine.

Therefore, as shown in FIG. 5, a soundproof wall having a sound deadening cylinder 2 attached to the upper end of a soundproof wall 1 has been developed.
As shown in the figure, the soundproof wall is provided with a sound-absorbing cylinder
Is diffracted so as to go around the surface of the sound-receiving wall, so that the diffraction distance of the sound wave connecting the sound source and the sound receiving point is increased, and there is an advantage that the soundproofing effect can be enhanced without making the overall height of the soundproof wall too high.

However, since the size of the muffling tube 2 must be increased to some extent in order to enhance the soundproofing effect, the end of the muffling tube 2 on the vehicle traffic side protrudes toward the road or track. As a result, when the size is increased, the position of the end of the silencer 2 exceeds the architectural limit set for the soundproof wall, and there is a risk of contact with the traveling vehicle.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a soundproof wall capable of increasing the size of a sound deadening cylinder without exceeding the architectural limit set for the soundproof wall. It was done to do so.

[0006]

A sound-insulating wall according to the present invention for solving the above-mentioned problem is a sound-insulating wall having a sound-absorbing tube attached to an upper end of the sound-insulating wall, and the sound-absorbing tube is attached to the sound insulating wall. It has a central axis inclined from the surface to the side opposite to the vehicle traffic side. In addition, it is preferable that the muffler tube includes a main body having a circular or elliptical cross section, and a mounting leg extending obliquely from the main body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in more detail with reference to the drawings. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a front view of a soundproof wall of the present invention viewed from a road or a track side, FIG. 2 is a side view, and FIG. FIG. In these figures, reference numeral 1 denotes a sound insulating wall, and 2 denotes a silencer attached to the upper end thereof. The sound insulation wall 1 is configured by dropping a sound insulation panel 4 in multiple stages between pillars 3 made of H-shaped steel, as in the related art.

The sound absorbing cylinder 2 is formed by molding a sound absorbing material into a cylindrical shape, and the material is not particularly limited.
In this case, an aluminum porous sound-absorbing material formed by pressing aluminum fibers into a plate shape is used. The silencer 2
In addition, perforations made of metal or synthetic resin as surface material
Use as a plate or net, and use fibrous suction such as glass wool and rock wool.
Sound material alone or wrapped in film or glass loss
It may be built in. As shown in FIG. 3, the silencer 2 includes a main body 5 having a circular cross section, and mounting legs 6 extending obliquely from the main body 5. Then, the mounting surface 6a, which is the lower end surface of the mounting leg 6, is bolted to the mounting seat 7 at the upper end of the sound insulating wall 1, so that the central axis O of the sound deadening cylinder 2 moves from the mounting seat 7 to the sound insulating wall 1 to the vehicle traffic side. Should be inclined to the opposite side. Reference numeral 8 denotes a sound-insulating partition provided inside the muffler 2.
9 is a decorative plate that covers the outside of the mounting seat 7.

As a result, the noise reduction cylinder 2 is displaced from the upper end of the sound insulating wall 1 to the side opposite to the vehicle traffic side, so that it hardly protrudes to the vehicle traffic side, and as shown in FIG. Does not exceed the architectural limits set forth in Moreover, the diffraction distance of the sound wave is longer than when the sound deadening cylinder 2 is mounted directly above the sound insulating wall 1, and the sound reduction effect is enhanced.

That is, if the overall height is kept constant, the silencer 2 can be lengthened by the amount of the inclination of the silencer 2 and the diffraction distance of the sound wave becomes longer. Therefore, according to the experiment of the present inventor, FIG.
As compared with the case where the inclination angle of the silencer cylinder 2 having a circular cross section as shown in FIG.
Improves by 1.0 dB, the sound reduction effect is 1.5 when the inclination angle is 30 °
It was confirmed that the noise reduction effect was improved by 2.0 dB when the tilt angle was set to 45 °. However, if the muffler cylinder 2 is inclined too much, the amount of protrusion in the horizontal direction increases, so the inclination angle is preferably in the range of 10 to 45 °.

FIG. 4 shows a second embodiment of the present invention, in which a muffler 2 has a main body 5 having a horizontally elliptical cross section.
And a mounting leg 6 extending obliquely from the main body 5. The shape of the silencer 2 has the advantage that the diffraction distance of the sound wave can be made longer without increasing the overall height too much.

[0012]

As described above, the soundproofing wall of the present invention has a sound deadening cylinder having a central axis inclined to the side opposite to the vehicle traffic side from the mounting surface to the soundproofing wall, mounted on the upper end of the soundproofing wall. Therefore, even if the size of the silencer is increased, the silencer does not exceed the architectural limit set for the soundproof wall. Moreover, the noise reduction effect can be enhanced while keeping the overall height constant by inclining the silencer cylinder. Therefore, the present invention has an advantage that a soundproofing effect superior to the conventional one can be obtained while keeping the architectural limit.

[Brief description of the drawings]

FIG. 1 is a front view of a soundproof wall according to a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an enlarged side view of the muffler.

FIG. 4 is an enlarged side view of a sound deadening cylinder according to a second embodiment of the present invention.

FIG. 5 is a side view of a conventional example.

[Explanation of symbols]

1 sound insulation wall, 2 silencer, 3 H-shaped steel column, 4
Sound insulation panel, 5 main body, 6 mounting legs, 6a mounting surface, 7 mounting seat, 8 partition plate, 9 decorative plate O central axis

Claims (2)

(57) [Claims] 1. A sound insulating wall having a sound deadening tube attached to an upper end of a sound insulating wall, wherein the sound deadening tube has a central axis inclined from a mounting surface to the sound insulating wall to a side opposite to a vehicle traffic side. Soundproof wall. 2. The soundproof wall according to claim 1, wherein the silencing cylinder comprises a main body having a circular or elliptical cross section, and a mounting leg extending obliquely from the main body.