JP3297002B2 - Soundproofing device using crushed granules - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of crushed particles formed by crushing waste glass bottles, pottery, shells, etc. to reduce noise generated on roads, railways, factories, airfields, and the like. It relates to a device for preventing.

[0002]

2. Description of the Related Art For example, a noise barrier on a highway is a concrete wall.
Although it is formed with the wall of the wall standing up, it is effective to some extent in that it does not leak noise to the outside. However, since the soundproof wall of the concrete reflects sound, there is a drawback that noise is trapped on the expressway, and the effect of preventing transmission of noise to the outside cannot be obtained unless the height of the wall is increased.

[0003] Instead of a concrete soundproof wall, a perforated plate,
There are soundproofing devices using soundproofing materials such as glass wool,
It has the disadvantage that it becomes expensive as well as weather resistance and durability, and is not generally used on highways and the like.

[0004] In addition, noise has different sound properties such as amplitude and frequency depending on the source, noise transmission conditions, weather conditions, and the like, and sounds having different properties are mixed. Therefore, it is extremely difficult to prevent noise.

[0005]

The present applicant has previously invented a "pulverizing device for glass and the like" and applied for a patent (Japanese Patent Publication No. 61-47979, Japanese Patent No. 1381110). The present applicant has paid attention to the fact that the surface of crushed particles of glass or the like generated by crushing an empty glass bottle or the like with this apparatus is formed of many surfaces.

That is, the problem to be solved by the present invention is to make use of the fact that the surface of the crushed particles is formed by a large number of surfaces, and to reduce noise having a simple structure and a mixture of sounds having different properties. On the other hand, an object of the present invention is to provide a soundproofing device having a large soundproofing effect.

[0007]

A feature of the present invention is that a screen for allowing sound to enter is formed in a lid shape having an upper surface and front, rear, left and right side surfaces, and the screen is formed on a bottom plate formed of a perforated plate. Attached below, a crushed particle layer formed of crushed particles of glass or the like having a large number of surfaces on the surface is formed between the screen and the bottom plate to diffusely reflect sound entering from the screen. .

[0008]

1 to 3 show a typical soundproofing device. FIG. 1 shows a soundproofing device A1 having the simplest structure. Reference numeral 1 denotes a case, which is formed of a steel plate in a box shape except for a front portion. Reference numeral 2 denotes a screen, which is attached to the front surface which is open. Reference numeral 3 denotes a sound absorbing material formed of a porous plate, a plate of a porous material such as cork, glass wool, or the like, and is attached to the inner wall at the rear of the case 1. Reference numeral 4 denotes a crushed particle layer, which is formed of crushed particles such as a large number of glasses contained in the case 1.

The screen 2 has an outer diameter of about 3 to 8 that allows sound to pass through easily and is housed in the case 1.
A steel mesh having such a degree of roughness that crushed particles of glass (mixed in size) of mm or the like are not spilled out is used. In addition to the steel mesh, a heat-resistant and pressure-resistant hard plastic mesh or stainless steel mesh can be used as the screen 2.

Here, as shown in FIG. 4, the crushed particles 4 ', such as glass, forming the crushed particle layer 4 have a large number of curved surfaces or flat surfaces, and moreover, may be injured when handling. There is no sharp edge line. Such crushed particles of glass or the like can be easily obtained by crushing waste glass empty bottles, pottery, shells, waste incineration ash, and the like with the above-mentioned “crushing device for glass and the like”. The use of the above-mentioned pulverizer is convenient because, when pulverizing empty glass bottles and the like, labels, stoppers and the like attached to the empty glass bottles and the like are removed from the crushed particles. Of course, it is also possible to use crushed particles such as glass crushed by other means.

Therefore, the sound that has entered the crushed grain layer 4 from the screen 2 is gradually reduced in energy while being irregularly reflected by large and small crushed grains having a large number of surfaces.
It is absorbed by the sound absorbing material 3.

The soundproofing device A2 shown in FIG. 2 is one in which the inside of the case 1 is divided into front and rear parts by a partition plate 5. Crushed particles such as glass of about 2 to 5 mm are accommodated, and a front crushed particle layer 4a and a rear crushed particle layer 4b are formed, respectively, to provide two-stage soundproofing. The partition plate 5 allows sound to pass easily, and furthermore, both rooms 1
A perforated plate having a rough surface in which the crushed particles a and 1b are not mixed is used. 3 is a sound absorbing material.

In the soundproofing device A3 shown in FIG. 3, the interior of the case 1 is divided into two sections 5a, 5b by a front room 1a, a middle room 1c, and a rear room 1.
b. In order to enhance the sound collection effect in the front chamber 1a, the outer diameter is 6 to 8 mm, and in the middle chamber 1c, the outer diameter is 5 to 4 m.
In the rear chamber 1b, crushed grains having an outer diameter of 2 to 3 mm are accommodated, respectively, to form a front crushed layer 4a, a medium crushed grain layer 4c, and a rear crushed grain layer 4b. Partition plates 5a, 5b
Is a perforated plate as described above. This soundproofing device A3
Is a three-stage soundproofing. If necessary, the number of crushed particle layers can be further four or more. 3 is a sound absorbing material.

The size of the soundproofing devices A1, A2, A3 is arbitrary depending on the application. Incidentally, the soundproofing device A1 of the illustrated example
Is about 60 to 100 mm, the depth of the soundproofing device A2 is about 100 to 150 mm, and the depth of the soundproofing device A3 is about 150 to 200 mm or more.

For example, since the soundproofing device A1 has a short depth, the soundproofing device A1 can be installed between an outer plate and an inner plate of a wall of a building to form a soundproofing wall. In this case, the soundproof wall has not only a soundproof function but also a heat insulating function because a large amount of air exists between the crushed particles.

FIG. 5 shows a case where the present invention is applied to a noise barrier such as a road, especially a highway. Reference numeral 11 denotes a column formed by erecting an H-section steel on a road shoulder. The soundproofing device A1 is fitted between the columns 11 to form a soundproof wall. A reinforcing member is attached between the columns 11 as necessary to reinforce the column. When implemented on a road in this manner, the soundproof wall can be lowered because the soundproofing effect is large, so that the scenery is not hindered.

Next, FIG. 6 shows a soundproofing device A4 to be installed on a general road in addition to a slab track such as a railway or an iron bridge. 2
Is the above-mentioned screen, and 6 is the bottom plate. A porous steel plate is used for the bottom plate 6 in consideration of strength. The lid-shaped screen 2 is attached to the bottom plate 6 so as to be openable and closable, covering the upper surface excluding the bottom, the front, rear, left and right side surfaces. The crushed particles having an outer diameter of 3 to 6 mm forming the crushed particle layer 4 are accommodated therein. Therefore, the sound enters the crushed grain layer 4 from all sides. Reference numeral 7 denotes a mounting hole into which a fastener such as a bolt is inserted.

The soundproofing device A4 is fixed between the rails 13 of the slab track 12 as shown in FIG. 7 as an example, and absorbs the noise generated by the slab track 12 to reduce the noise. In addition, the soundproofing device A4 absorbs the energy of the vibration by the vibration of the slab track 12 and the crushed particles in the large and small sections of the crushed particle layer 4 vibrate at different periods, thereby absorbing the vibration energy. Have.

Although not shown, when the soundproofing device A4 is fixed to an inner wall near the entrance of a tunnel such as a road or a railroad, the impact noise generated when a car or train exits the tunnel is absorbed and noise is reduced.

When the soundproofing device is applied to roads and railways, the light reflection effect is enhanced by using glass or a mixture of glass and waste incineration ash for the crushed particles.

[0021]

According to the present invention, since a crushed particle layer is formed by crushed particles having a large number of surfaces on the surface, the soundproofing effect is high.

The structure is simple, and no cost is required because waste glass empty bottles or the like are used, so that labor and cost for waste disposal can be saved.

When a soundproof wall of a road is formed by a soundproofing device using crushed glass particles, the light of an illuminating lamp or the light of an illuminated automobile reflects irregularly on the crushed particles, so that the road shoulder and the road surface can be easily identified. And contribute to traffic safety.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a soundproofing device having a single layer of crushed particles.

FIG. 2 is a sectional view of a soundproofing device having two crushed particle layers.

FIG. 3 is a sectional view of a soundproofing device having three crushed particle layers.

FIG. 4 is an external view of crushed particles.

FIG. 5 is an explanatory diagram of a case where the soundproofing device is applied to a soundproof wall of a road.

FIG. 6 is a sectional view of a soundproofing device installed on a slab track or the like.

FIG. 7 is an explanatory view in which the soundproofing device is installed on a slab track.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Screen 3 Sound absorbing plate 4, 4a, 4b, 4c Crushed particle layer

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Claims (1)

(57) [Claims] 1. A screen through which sound enters is formed in a lid shape having an upper surface and front, rear, left and right side surfaces. The screen is attached to a bottom plate formed of a perforated plate with a bottom portion facing down. A soundproofing device using crushed particles in which a crushed particle layer formed of crushed particles of glass or the like having a large number of surfaces on the surface, which irregularly reflects sound entering from a screen, is formed.