JP2004132062A - Sound insulation wall for railways - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound insulation wall for railways, which mitigates noises generated at railways of narrow-gauge lines. <P>SOLUTION: The sound insulation walls 1 are arranged on both sides of a railway track R of the narrow-gauge line. The noised generated at the railways of the narrow-gauge lines mainly consists of rolling sound generated between rails and wheels, and mechanical sound generated from a motor, a gear, etc. because a vehicle travels at a low speed. To cope with the noises, interruption of sound source at a lower portion of the vehicle structure is sufficient, and therefore the sound insulation wall having a height of about 2 meters achieves a satisfactory effect. Thus the sound insulation wall structure and a foundation embedded in the ground are simplified, which leads to excellent cost-effectiveness. The rolling sound and the mechanical sound have frequency characteristics that can be sufficiently absorbed by an inexpensive sound absorbing material such as glass wool, so that the sound insulation wall need not have specific sound absorbing properties and can be formed of the inexpensive material. A sound insulating material may be formed of a steel plate, which also leads to the inexpensive sound insulating wall. The sound insulating walls 1 are each formed like an inverted ell, and arranged so as to have a height that does not obstruct visibility from a vehicle window W and at an interval that does not hinder traveling of the vehicle T. A sound absorbing member 20 may be laid on the ground G to absorb noises reflected by the upper surface of the ground G. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a railway noise barrier provided on a conventional railway track.
[0002]
[Prior art]
The sound sources of railway noise are various, such as rolling noise generated between wheels and rails during traveling, mechanical noise generated from power parts such as motors, aerodynamic noise generated from air resistance of the vehicle body, and spark noise from overhead lines. . Among them, the rolling noise and the mechanical noise always occur during traveling.
[0003]
Regarding these railway noises, environmental standards have been established for so-called Shinkansen railways such as the Tokaido Shinkansen and Sanyo Shinkansen, and in order to satisfy the standards, conventionally, as described in JP-A-7-305310, etc. Various soundproof walls have been proposed.
[0004]
On the other hand, except for the Shinkansen railway, JR Railways and other private railways, so-called conventional railways, have standards set when new construction or large-scale improvements are made to railways. It is the fact that it corresponds to.
[0005]
[Problems to be solved by the invention]
However, conventional noise barriers are located farthest from the tracks along the left and right edges of the railway track ground (in the case of double track, along the left edge of one track and the right edge of the other track) The main purpose is to prevent noise from reaching the residents along the track. Further, the soundproof wall of the Shinkansen railway has a height of about 5 m because it is necessary to shield aerodynamic noise caused by air resistance of the vehicle body and spark noise from the overhead wire. In addition, noise barriers are also installed on expressways, which are also installed along the left and right edges of the road to prevent noise from reaching residents along the road. Since many types of vehicles pass, the height is about 8 m.
[0006]
Even on conventional railways, the need for noise countermeasures for residents along the track is required due to the increasing awareness of noise environment and speeding up. In addition, due to the improvement in living standards, it has become necessary to block noise and provide a comfortable ride.
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to reduce the noise caused by running a vehicle at a low cost, not only for residents along the railway, but also for passengers in conventional railways.
[0008]
[Means for achieving the object]
In order to achieve the above object, the present invention relates to a conventional railway, in which noise generated by rolling between a rail and wheels and motor noise are lower than noise generated by a high-speed running Shinkansen due to low-speed running. Focusing on mechanical noise generated from gears and gears, focusing on sound sources concentrated on the lower side of the vehicle structure, installing soundproof walls on the left and right sides of the vehicle to shield the lower half of the vehicle They tried to be soundproof.
[0009]
Since the soundproof wall according to the present invention only needs to shield a sound source from below the vehicle structure, a sufficient effect can be exhibited at a height of about 2 m. For this reason, the soundproof wall structure and the underground burial foundation can be simplified, and the cost-effectiveness can be improved. In addition, since the rolling noise and mechanical sound are frequency characteristics that can be sufficiently absorbed even by inexpensive sound absorbing materials such as glass wool, special sound absorbing characteristics are not required. it can. Further, a steel plate can also be used for the sound insulating material, and thereby, an inexpensive sound insulating wall can be obtained.
[0010]
In addition, as long as there is no hindrance to the running of the vehicle, bringing the sound barrier closer to the track will increase the sound insulation effect, reducing not only the noise along the railway, but also the noise to the passengers.
[0011]
Specifically, a railroad soundproof wall provided along the railroad track of a conventional railroad vehicle running on wheels, provided on the ground on both sides of the track, and having a height equal to or less than a height that does not obstruct the view from the vehicle window. The sound absorbing surface is formed on the surface of the vertical wall facing the track, and the sound absorbing surface absorbs the rolling noise of the wheels and the noise generated by the motor and the like.
[0012]
The soundproof wall having this configuration absorbs rolling noise and mechanical sound from the traveling vehicle on the inner surface of the soundproof wall, that is, the sound absorbing surface on the sound source side, and effectively reduces generated noise.
[0013]
In this configuration, it is possible to provide a lateral wall extending from the standing wall to the vehicle side to such an extent that the traveling of the vehicle is not hindered, and to form a sound absorbing surface on a surface of the lateral wall facing the track. The side wall portion wraps and absorbs the sound, so that the noise is hardly leaked, the noise reduction effect is enhanced, and a function of preventing the soundproof wall from being damaged by wind pressure when the vehicle is running can be provided.
[0014]
At a station, only the upright wall portion or a soundproof wall having an inverted L-shaped cross section is provided on the lower surface of the platform on the track side. Generally, the platform has a configuration in which the upper surface protrudes from the track side and an evacuation area is provided below the platform (see FIG. 8). If a soundproof wall is provided on the inner surface of the evacuation area, the support frame (pillar) and the like are provided. It becomes unnecessary.
[0015]
When there are a plurality of tracks (in the case of a double track), “on both sides of the track” referred to in the claims is on both sides of each track, and there is a sound barrier between each track. It becomes.
[0016]
In these configurations, if a sound absorbing member is laid on the ground of the track, noise reflected from the ground upper surface can be reduced, and noise can be further reduced.
[0017]
Embodiment
Embodiments are shown in FIGS. 1 to 4, and in the embodiment of FIGS. 1 and 2, in a conventional railway, a soundproof wall 1 consisting of only a standing wall portion 1 a is provided on both sides of a track R on an upper surface of a track ground G thereof. In the embodiment shown in FIGS. 3 and 4, the soundproof wall 1 having a horizontal side wall 1b extending from the standing wall 1a to the vehicle T side to such an extent that the traveling of the vehicle is not hindered is provided. . The soundproof wall 1 is provided with a support H at a required length interval of the track R as necessary, and a sound absorbing panel 10 is attached to a surface of the support H facing the track R to form a sound absorbing surface.
[0018]
At this time, the height of the soundproof wall 1 (the standing wall portion 1a) is set to a level that does not obstruct the view from the window W of the vehicle T (not more than the height), and the side wall portion 1b has a length that does not hinder the traveling of the vehicle T. I do. As shown in FIGS. 1 and 3, the soundproof wall 1 between the tracks R and R may be configured by providing columns H and attaching the sound absorbing panels 10 to both columns H. As shown in FIG. 4, the sound absorbing panel 10 may be attached to both sides of one support H.
[0019]
The sound absorbing panel 10 is a sound absorbing material such as glass wool filled in a flat box having a perforated plate on the surface and a steel plate on the back surface described in JP-A-2001-142467. And the configuration shown in FIGS. The sound absorbing panel 10 includes a box body 11 having an upper surface opening, a lid 12 thereof, and a sound absorbing material 13. The box body 11 is formed by bending a rib 14 in the middle of a bottom plate (back plate) 11a. A tongue piece 11b is provided on the upper edge of the front surface. The left and right surfaces of the box body 11 are formed by fitting the side pieces 11c.
[0020]
The lid 12 is made of a perforated plate, and a tongue piece 12a is provided on the upper edge of the front surface. The sound absorbing material 13 is made of a fibrous sound absorbing material such as glass wool or a porous sound absorbing material. The sound absorbing material 13 is loaded into the box main body 11, the cover 12 is put on the box main body 11 through the intervening metal 15, and screws are fixed. The lid 12 is fixed to the box body 11 by spot welding or the like. At this time, the surface of the sound absorbing material 13 is covered with a protective material such as a glass cloth or a waterproof film (not shown).
[0021]
As shown in FIG. 5, the upright wall portion 1a may be configured such that the upper portion thereof is curved toward the track R to form the horizontal wall portion 1b with the curved portion (the sound insulating wall 1 may have an inverted J-shaped cross section). Further, as shown in FIG. 6, if the entire vertical wall portion 1a is inclined toward the track R, the function of the horizontal wall portion 1b can be exhibited by the inclination. At this time, as shown in FIG. 7, the soundproof walls 1, 1 between the tracks R, R can be supported by T-shaped columns H.
[0022]
In the embodiment of FIG. 8, the soundproof wall 1 is formed on the lower surface of the platform P at the station. For example, the above-described sound absorbing panel 10 is provided in an inverted L shape on the lower surface of the platform P by screwing or the like.
[0023]
The present invention can, of course, be applied to an elevated track. As shown by the dashed lines in FIGS. 1, 4, and 8, in each embodiment, the sound absorbing member 20 (such as a porous elastic body in which waste tires or the like are solidified on the ground G, a porous stone body, etc. Can be laid. Further, as shown by the chain line in FIG. 6, the entire standing wall portion 1a (soundproof wall 1) can be formed in a bay shape.
[0024]
Needless to say, the soundproof wall 1 can be obtained by appropriately combining the respective aspects of the respective embodiments.
[0025]
【The invention's effect】
The present invention is constructed as described above, and a soundproof wall is installed near the vehicle (track) so as to cover only the lower half of the vehicle. Therefore, it is possible to meet the noise reduction demands of passengers as well as residents along the railway. Also, it does not obstruct the view of the passenger.
[Brief description of the drawings]
1 is a schematic sectional view of one embodiment; FIG. 2 is a schematic sectional view of another embodiment; FIG. 3 is a schematic sectional view of another embodiment; FIG. 4 is a schematic sectional view of another embodiment; FIG. 6 is a schematic sectional view of another embodiment. FIG. 7 is a schematic sectional view of another embodiment. FIG. 8 is a schematic sectional view of another embodiment. FIG. 10 is an example of a sound absorbing panel. FIG. 11 is a sectional view of the sound absorbing panel. FIG. 12 is an exploded perspective view of the sound absorbing panel.
G Ground H Support P Platform R Track T Vehicle W Vehicle window 1 Soundproof wall 1a Standing wall 1b Side wall 10 Sound absorbing panel 20 Sound absorbing member

Claims (4)

A railroad soundproof wall 1 provided along a conventional railroad track R of a railroad vehicle T running on wheels,
It is provided on the ground G on both sides of the track R and has an upright wall portion 1a having a height of not more than a height that does not obstruct the view from the wheel window W. A sound absorbing surface is formed on a surface of the upright wall portion 1a facing the track R. And a sound absorbing surface for absorbing rolling noise of the wheels and noise generated by a motor or the like. A lateral wall portion 1b extending from the standing wall portion 1a to the vehicle side so as not to hinder the traveling of the vehicle T, and a sound absorbing surface is formed on a surface of the lateral wall portion 1b facing the track R. Item 2. The railroad soundproofing wall according to Item 1. The soundproof wall for railway according to claim 1 or 2, wherein the soundproof wall (1) is provided on a lower surface of the platform (P) on the track (R) side at a station. The railroad soundproof wall according to any one of claims 1 to 3, wherein a sound absorbing member (20) is provided on the ground (G) on the lower surface of the track (R).

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