JP2003159572A - Dust preventing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of dust from a load when the load generating dust such as waste, incineration ash or the like is discharged from the bed of a vehicle such as a dump track or the like. <P>SOLUTION: When the load 2 generating dust such as waste, incineration ash or the like is discharged from the bed 1A of the vehicle such as the dump track 1 or the like, the load 2 is discharged at a place where foam 6 is deposited to prevent the generation of dust. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing dust from being generated when unloading a load that generates dust such as waste and incineration ash from a bed of a vehicle such as a dump truck.

[0002]

2. Description of the Related Art In a garbage landfill site, garbage, incinerated ash, etc., carried by vehicles such as dump trucks and packer trucks are unloaded by inclining a loading platform and disposed of in landfill.

When unloading wastes, incineration ash, etc. from this vehicle, dust is generated when the wastes, incineration ash, etc. fall from the loading platform. The dust generated during unloading has a bad influence on the health of workers, and in particular, incineration ash and the like contain harmful substances such as dioxins, and therefore have a great bad influence on health. Further, dust generated may be scattered by the wind, which may adversely affect the surrounding environment.

Therefore, preventing the generation of dust during unloading is an important issue for maintaining the working environment and the surrounding environment.

[0005]

Conventionally, no special measures have been taken against the generation of dust at the time of unloading, and water sprinkling is carried out in some cases. However, in general, dust generated from waste or incinerated ash is difficult to get wet with water, and cannot be sufficiently captured only by sprinkling water, so a sufficient dust prevention effect is not obtained.

The present invention solves the above-mentioned conventional problems and prevents the generation of dust from the cargo when unloading the cargo that generates dust such as waste and incinerated ash from the loading platform of a vehicle such as a dump truck. An object of the present invention is to provide a dust prevention method.

[0007]

The dust prevention method of the present invention is a method for preventing the generation of dust when unloading a load that generates dust such as waste or incinerated ash from a loading platform of a vehicle such as a dump truck. In the above, the load is unloaded at the place where the bubbles are accumulated.

The generation of dust from a package such as waste or incineration ash occurs when the package is dropped during unloading, and the dust generated by the impact when it is struck on the floor or the ground is generated by the package dropping. It expands when it is rolled up by the air flow. According to the present invention, since the unloading is carried out in the accumulation layer of bubbles, the unloading baggage is easily buried in the bubbles, the impact at the time of dropping is mitigated, and the generation of dust due to the dropping is prevented. Since this foam is light and has a nodule, it can cover even the entrained air and prevent the generation of airflow when falling. In addition, the dust adhered to the surface of the foam also prevents the dust from rising.

In the present invention, it is preferable that the bubbles are deposited in a thickness sufficient to cover the dropped load. For this purpose, it is preferable to enclose a place to be unloaded with a frame in advance and deposit bubbles inside the frame. It is also effective to arrange a member for preventing bubbles from entering the lower side of the vehicle.

In the present invention, it is preferable to spray an antifoaming agent on the accumulated foam after the completion of unloading to eliminate the foam. By doing so, it is possible to prevent scattering of bubbles to which dust is attached.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the dust prevention method of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic sectional view showing an embodiment of the dust prevention method of the present invention.

FIG. 1 shows a dust prevention method when unloading a cargo 2 such as waste and incinerated ash loaded on a loading platform 1A of a dump truck 1 to a garbage landfill site 3. The frame 4 is assembled in advance at the unloading place of No. 3, the periphery is surrounded by the sheet 5, etc., and the bubbles 6 are accumulated in this (FIG. 1 (a)),
The loading platform 1A of the dump truck 1 is tilted, and the load 2 is dropped into the deposition layer of the bubbles 6 to unload the load (FIG. 1 (b)). In addition,
A shield plate 7 for preventing bubbles from entering the lower side of the dump truck 1 is provided in a portion where the rear portion of the dump truck 1 is located when unloading.

As for the bubbles, for example, as shown in FIG. 1A, an aqueous solution 11 of a surfactant is placed in a container 12 having an open upper part, and pressurized air is supplied from a compressor 13 or the like to the aqueous solution of the surfactant in the container 12. It can be easily generated by aerating 11 and bubbling. At the top of this container 12,
A mesh 14 of woven fabric, metal, plastic or the like may be provided to promote foaming and control the size of the foam. Further, the mesh 14 may be provided in a plurality of stages of two or more. In this case, by providing a relatively coarse mesh in the lower stage and a relatively fine mesh in the upper stage, it is possible to favorably obtain the foaming promoting effect and the uniformizing effect of the bubble size. The mesh size of this mesh is preferably about 0.05 to 1 mm.

When bubbling, exhaust gas from a vehicle such as a dump truck may be used instead of the compressed air from the compressor.

Instead of pressurized air, sodium carbonate may be added in advance to an aqueous solution of a surfactant, and sulfuric acid or the like may be added to generate carbon dioxide gas.

Further, as shown in FIG. 1, the bubbles are bubbled by aerated air in the aqueous solution of the surfactant in the container, and the aqueous solution of the surfactant is sucked by using an ejector or supplied by a pump. It can also be generated as a liquid. In this case, by providing the above-mentioned mesh at the foam outlet, it is possible to make the foam uniform and promote foaming.

As the aqueous solution of the surfactant, a commercially available kitchen detergent or the like diluted with water at a normal use concentration or about 10 times the concentration can be used. A foam stabilizer for stabilizing foam may be added to the aqueous solution of the surfactant.

The bubbles 6 need to be deposited to a thickness sufficient to cover the unloading load 2, and therefore, as shown in FIG. 1, a frame 4 and a sheet 5 surround the unloading region. Is effective.

If the bubbles remain after the unloading is finished, the bubbles to which the dust adheres may be blown up by the wind. Therefore, after dropping the load 2 into the accumulation layer of the bubbles 6 and unloading the load. It is preferable that a foam defoaming agent such as silicone is sprayed on the unloading place to eliminate the foam.

It should be noted that dust is generated even when the load collapses on the loading platform of a vehicle such as a dump truck at the time of unloading or prior to unloading. Therefore, in order to prevent this dust, the load on the loading platform is removed before unloading. Bubbles may be deposited on top. Further, bubbles may be supplied to the falling luggage.

The dust prevention method of the present invention as described above is not limited to the dumping of waste and incinerated ash to the landfill site, but also the load that generates dust from the loading platform of the vehicle when the load is unloaded at the construction site. It is also applicable when dropping and unloading.

[0023]

EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples below.

Example 1 Two-ton dump trucks were loaded with 2 pieces of incinerated ash discharged from the refuse incinerator.
Tons of tons were loaded and transported to the landfill site, and when unloading on the sloping land of the landfill site, bubbles were deposited in advance at the unloading site to prevent dust generation.

That is, as shown in FIG. 1, a frame having a height of 3 m is assembled in advance in a square area of 4 m on a side of the unloading point, the side surface is surrounded by a polyethylene sheet, and bubbles are about 2 m in this enclosure. Deposited. The foam was generated by putting a commercially available kitchen detergent in a container as a 3% by weight aqueous solution and aerating compressed air through the aqueous solution with a compressor. A plastic mesh (mesh size: about 0.5 mm) for insect screens was provided in two stages at the upper opening of this container to make bubbles uniform.

When the ash of the dump truck was tilted and the incineration ash was dropped into the accumulated layer of foam to unload it, the foam vibrated violently, but no dust was generated.

After the completion of unloading, the foam was extinguished by spraying a silicone type defoaming agent, but no dust was generated thereafter.

Comparative Example 1 In the same manner as in Example 1, 2 ton of incinerated ash was dropped from the dump truck to a place where bubbles were not accumulated in the landfill to unload the ash, and a large amount of dust was generated. , The surrounding environment was significantly impaired.

[0029]

As described in detail above, according to the dust prevention method of the present invention, dust such as waste or incinerated ash is discharged from the bed of a vehicle such as a dump truck or a packer truck at a landfill site or a construction site. It is possible to prevent the generation of dust when unloading a load that generates a load, and maintain a good working environment and surrounding environment. The method of the present invention deposits bubbles in advance at the unloading place, and since the bubbles can be generated by a simple and inexpensive device, they are highly practical methods.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a dust prevention method of the present invention.

[Explanation of symbols]

1 dump truck 2 luggage 3 garbage landfill 4 frames 5 sheets 6 bubbles 11 Surfactant solution 12 containers 13 Compressor 14 mesh

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hisamu Ariga             Kurita, 3-4-3 Nishi-Shinjuku, Shinjuku-ku, Tokyo             Industry Co., Ltd. (72) Inventor Yasuhiko Ishii             Kurita, 3-4-3 Nishi-Shinjuku, Shinjuku-ku, Tokyo             Industry Co., Ltd. F-term (reference) 3B117 AA01 BA51                 4D011 CA01

Claims (4)

[Claims] 1. A method for preventing the generation of dust when unloading a load that generates dust such as waste and incineration ash from a loading platform of a vehicle such as a dump truck, wherein the load is placed at a place where bubbles are deposited. Dust prevention method characterized by unloading. 2. The dust prevention method according to claim 1, wherein a place to be unloaded is surrounded by a frame in advance, and bubbles are accumulated inside the frame. 3. The dust prevention method according to claim 1, wherein a member for preventing bubbles from entering the lower side of the vehicle is arranged. 4. The dust prevention method according to claim 1, wherein after the unloading is completed, a defoaming agent is sprayed on the accumulated bubbles to eliminate the bubbles.