JPS59195912A - Noise control apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound excitation control device having a plurality of hollow passages with different pipe lengths.

This Yuzu Noise Book Tsukuda 1 device is also called an interference type soundproofing device, for example, Japanese Patent Publication No. 54-2006, Japanese Patent Publication No. 54-2006,
As described in Publication No. 42728, etc., it has a plurality of hollow passages with different pipe lengths, and the inlet and outlet of these hollow passages are respectively provided on the noise incidence uII and the sound emission surface, and the noise incidence , a part of the noise propagating from the noise source located on the surface side is refracted by passing through a number of hollow passages with various pipe lengths through an inlet on the noise incident surface, and the phase is shifted. A sound reduction area is created by making use of the phase difference between the refraction delayed propagation sound emitted from the exit of the hN radiation surface and the direct propagation sound from the noise source to cause interference, and the noise is reduced by the Gagaru interference principle. This is a device that allows you to

Unlike conventional soundproof walls, this noise control device has a large sound reduction and soundproofing effect by utilizing the above-mentioned interference phenomenon of propagated sound.Compared to soundproof walls, this noise control device has a large sound reduction and soundproofing effect.Compared to soundproof walls, there is less sound diffraction phenomenon, so it can be reduced even from a distance. Metals such as stainless steel have a large sound effect, are effective against noise sources that cannot be completely covered, and have the advantage of allowing heat and air to pass through, as well as having excellent water resistance and weather resistance. Not only non-rigid and light materials, but also plastic materials such as urethane resin or rubber-like elastic bodies can be used as constituent materials, which has the advantage that the device can be made smaller and lighter.

For this reason, when using the above-mentioned interference type noise control device to counter train noise generated by the running of railway vehicles such as Shinkansen trains, it is necessary to place the noise control device on the upper end of the front wall or on the concrete wall. By doing so, even with a relatively low soundproof wall in a narrow installation space, a sufficient sound reduction effect can be obtained at a sound receiving point far away from the soundproof wall.

However, when an interference type noise control device is installed on the upper end of a soundproof wall, etc., some of the delayed propagation sound is directly propagated to the rear surface opposite to the front surface, that is, to the noise emission surface side of the noise control device. There is a problem that the sound propagates without being sufficiently interfered with by the noise, and the sound reduction effect is not sufficiently produced.

Therefore, in order to fully demonstrate the sound reduction effect of an interference-type noise control device, it is necessary to install at least the upper end of the rear surface, which is the noise emission surface, on the rear side of the noise control device at an appropriate distance from the rear surface. It is safe to install soundproofing means such as another soundproofing wall or a soundproofing wall of a higher height to prevent the above-mentioned uninterfered refraction-transmitted sound from propagating.

Installation of such sound insulation walls, etc. is not a problem if there is sufficient space to install the noise control device, or if the noise control device is installed on the ground or on the floor, but if there is sufficient space on both sides of the railway line. There is a problem in that it is not easy when installation space is not available or when it is attached to the upper end of a soundproof wall or the like.

The present invention has been made in view of the above-mentioned problems, and is characterized in that a sound insulating plate is integrally connected and provided at the rear of a noise control hollow body having a plurality of hollow passages with different pipe lengths. It is possible to install a noise control device with a high sound reduction effect that can reliably reduce noise in a narrow installation space, and also a sound insulating board when installing the noise control device'+Wt on the upper end of a soundproof wall, etc. The purpose of the present invention is to provide a noise control device that solves installation problems, is easy to handle, and is easy to install.

The invention will now be explained with reference to the drawings.

In FIGS. 1 and 2, 1 is a noise control hollow body made of synthetic resin or other suitable material, and has inside it a plurality of hollow passages 2 of different lengths, and these hollow passages are Extending in the noise propagation direction from the entrance 2a on the noise incidence surface 1a installed toward the noise source side, an exit 2b is opened on the rear surface 1b which is the noise radiation surface, and in the illustrated example, the hollow passage 2 is connected to the entrance 2a. After extending horizontally in a plane that includes the direction of noise propagation, each section is bent vertically downward and extended.

Reference numeral 3 denotes a sound insulating plate that is integrally connected to the noise control hollow body l by a connecting member 4, and this sound insulating plate 3 is connected from the rear face lb so that an appropriate interference sound attenuation space 5 exists on the rear face lb side of the noise control hollow body 1. A sound insulation rear plate part 6 located at an appropriate distance mlU, and a space 5 between the noise control hollow body l and the rear plate part 6.
It has a sound insulating bottom plate portion 7 extending horizontally between the lower end 10 of the hollow body 1 and the lower end 6a of the rear plate & A suitable sound absorbing material 8 is attached to the inner surface of the space 5 to stabilize the sound field within the space 5 and improve the sound reduction effect.

Reference numeral 9 indicates reinforcing ribs protruding from the rear plate and bottom plate portions 6 and 7 of the sound insulating plate 8.

A diagonally extending oblique side portion 10 is provided between the plate portion 6 and the bottom plate portion 7, and a connecting lug 11 is protruded from the oblique side portion 10, and a receiving groove 12 formed in the connecting lug 11 is provided with a noise control hollow body l. Side plate 13
.

The noise control device of the present invention configured as described above is, for example, combined as a single unit at a factory, and at the installation site, a second
As shown in the figure, the non-coupled side plate 14/ of the noise control hollow body l/ of the noise control device installed adjacently is inserted into the receiving groove 12 of the coupling lug 11 and connected with a suitable coupling tool to insulate the noise. By fitting the adjacent ends 3a, 3b7 of the plates 8, 3' into each other, the adjacent sound insulating plates 3, 31 can be connected and assembled without creating a gap between them.

3 to 6 show various installation modes of the noise control device according to the invention.

FIG. 3 shows an example in which the upper end of a wall 15 installed at a position away from the noise source is mounted on the side opposite to the noise source, and appropriate mounting metal fittings are attached to the upper end and back of the wall 15.

It is attached and fixed with bolts, nands, etc. 16.17.

FIG. 4 shows an example in which it is attached to the noise source side of the upper end of the wall 15, and is fixed at the upper end and front of the wall 15.

FIG. 5 shows a case where a wall is not provided for the noise source, or a case where the wall is installed on the floor 18 such that the upper end surface of the wall is a sufficiently wide flat surface, and the noise source is installed in front of the noise control device. The lower end portion and the rear lower end portion are attached and fixed.

Figure 6 shows the tnj easy installation method, and the noise level H;
l, a A hook fitting 19 made of spring steel or the like is attached and fixed to the rear plate portion 6 of the device, and is hooked onto a support fitting 20 such as a vibrator fixed to the upper end of the wall 15.

According to the present invention, by integrally combining the noise 1υU vertical hollow body and the sound insulating plate located behind it, for example,
When installing a noise control device in a relatively narrow installation space on both sides of a railway, etc., it is possible to eliminate the problem of a sound insulation wall or soundproof wall that should be installed behind it, and moreover, it is possible to eliminate the problem of a sound insulation wall or other sound insulation wall installed in a narrow place. By attaching it to the upper part of the surrounding wall, it is possible to obtain an efficient and reliable soundproofing effect.

Furthermore, it is easy to handle and construct on-site, and in particular, by making the hollow body and the sound insulating plate from a lightweight material such as plastic, it is advantageous in terms of strength.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic side view of the noise control device according to the present invention; FIG. 2 is a plan view showing the noise control device shown in FIG. 1 installed in connection with adjacent noise control devices; 6 are schematic diagrams showing various installation modes of the noise 1*1" sub-device according to the present invention. ■...Noise control hollow body 2...Hollow passage 3...
Sound insulating plate 4... Connecting member 5... Interference sound reduction space 6... Sound insulating rear plate part 7... Sound insulating bottom plate part 8... Sound absorbing material 11... Combined ears
15...Wall. Patent Applicant Japan National Railway Commuting Applicant Brideston Tire Co., Ltd. Patent Attorney Akatsuki Sugimura Competence Patent Attorney Sugi
Written by Ko Mura 4.

Claims (1)

[Scope of Claims] L. A noise control device comprising a sound insulating plate integrally connected to the rear of a noise control hollow body having a plurality of hollow passages with different pipe lengths. E. The sound insulation plate is separated from the rear surface of the noise control hollow body and includes a sound insulation rear plate and a sound insulation bottom plate that are connected to the noise control hollow body so as to define an interference space between the sound insulation plate and the rear surface of the noise control hollow body. A noise emission control device according to claim 1.