JP3816944B1 - Asbestos removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an asbestos removal method capable of preventing asbestos dust scattering and achieving substantially complete removal of asbestos.
A method of removing asbestos adhering to an asbestos construction surface of a ceiling, a wall, a beam, a pillar or other building,
A konjac solution that infiltrates the konjac solution, which is an aqueous solution of konjac koji powder, granules, surimi, small chunks, paste or extract, etc., into the asbestos layer to be removed, and makes the asbestos layer a semi-solid solution. Granting process;
An asbestos layer peeling step for peeling the asbestos layer in the semi-solid solution state from the asbestos construction surface;
An asbestos residue removing step of spraying dry ice particles to remove the asbestos residue from the asbestos construction surface with respect to the asbestos residue remaining on the asbestos construction surface after peeling.
[Selection] Figure 1

Description

  The present invention relates to a method for removing asbestos adhering to a structure such as a building.

Asbestos has excellent features such as fire resistance, heat insulation, and soundproofing, and has been widely used as a fireproof material, heat insulating material, and soundproofing material for buildings, such as being sprayed on the wall surface or ceiling of a building.
However, the fine needle-like fibers of asbestos are very harmful to the human body, and when taken into the respiratory tract, they are recognized as a cause of asbestosis, lung cancer, and malignant mesothelioma, and are regarded as problems.
Therefore, if people inhale the asbestos scattered by the dismantling of old asbestos buildings or the removal work of sprayed asbestos, it is dangerous for the human body, so it is strongly recommended to remove asbestos without adversely affecting the surroundings It has been demanded.

Conventionally, in construction to dismantle buildings and remove blown asbestos, the surrounding area including the wall surface part and ceiling part is surrounded in advance and the asbestos is moistened by spraying the anti-scattering treatment agent in advance. The scraper was peeled off from the wall surface or ceiling part and taken out to the outside.
JP-A-2-21984

  However, in the above asbestos removal method, it is unavoidable to manually work because of the use of tools, etc., increasing the burden on the worker and working in an environment where asbestos dust is scattered. In view of the health of the worker, there is a problem that it is not preferable to work continuously for a long time.

  Moreover, since asbestos is peeled off by using an instrument or the like by an operator's manual work, residues remain on the wall surface and the ceiling, and cannot be completely removed.

  The subject of this invention is made | formed in view of the said problem, and while providing asbestos removal method with which removal of asbestos substantially complete is achieved while preventing asbestos dust scattering.

Means for solving the problems / effects of the invention

In order to solve the above problems, the present invention related to an asbestos removal method is a method for removing asbestos adhering to an asbestos construction surface of a ceiling, wall, beam, column or other building,
A konjac solution that infiltrates the konjac solution, which is an aqueous solution of konjac koji powder, granules, surimi, small chunks, paste or extract, etc., into the asbestos layer to be removed, and makes the asbestos layer a semi-solid solution. Granting process;
An asbestos layer peeling step for peeling the asbestos layer in the semi-solid solution state from the asbestos construction surface;
Asbestos residue remaining on the asbestos construction surface after peeling, including an asbestos residue removal step of spraying dry ice grains to remove the asbestos residue from the asbestos construction surface ,
In the konjac solution application step, the konjac solution is sprayed a plurality of times with a predetermined holding time on the asbestos layer, and the konjac concentration, which is the mixture ratio of the processed konjac product in the konjac solution, is sprayed the konjac solution multiple times. It is characterized by being raised in a stepwise manner .

  In the present invention, the konjac solution is infiltrated into the asbestos layer, so that the asbestos layer becomes a semi-solid solution state, that is, a state like an oak, and is easily peeled off from the construction surface. At this time, since it is a semi-solid solution, asbestos dust hardly scatters to the surroundings, and there is no adverse effect on the surroundings at the time of removal. After the asbestos layer is peeled off, the fine asbestos residue adhering to the construction surface is removed by spraying with dry ice, thereby achieving substantially complete removal of asbestos. And since the sprayed dry ice particles are not sublimated and remain, post-processing is easy.

  In addition, as a pre-stage of the above invention, a wetting step of supplying a wetting liquid such as water to the asbestos layer to be removed is performed, and a konjac solution applying step, an asbestos layer peeling step, A residue removal step can be performed. Prior to supplying the konjac solution by spraying, the asbestos layer is provided with a wetting liquid such as water (spraying, etc.), and the asbestos layer is moistened in advance, so that the konjac solution is supplied in the next konjac solution supply. It becomes easier to penetrate into the inside of the layer, and the formation of a semi-solid solution is further facilitated.

Then, to grant konjac solution (feed) to the asbestos layer, but it is preferred to spray the konjac solutions, low konjac solution konjac concentration first spraying, then more konjac after a predetermined holding time If the konjac solution with high concentration is sprayed, the konjac solution effectively penetrates into the inside of asbestos, and a semi-solid solution layer with a high konjac concentration is formed on the outside, so the asbestos layer is made into a semi-solid solution to the inside, When peeling off, generation of dust from the asbestos layer can be prevented or suppressed. Also, by spraying the konjac solution with a high concentration step by step on the asbestos layer, a layer or film in which the outer layer is so gelled as to envelop the asbestos layer is formed, and thereby the asbestos layer is integrated into a semi-solid solution. Can be peeled off from the construction surface.

  The konjac solution is sprayed at least twice at a predetermined time, and the konjac concentration in the first stage spray is such that the weight ratio of the processed konjac product to water is 0.5: 9.5 to 2: 8. The konjac concentration in the last stage spray is effective to the inside of the asbestos layer if the weight ratio of the konjac koji processed product and water is selected in the range of 3: 7 to 7: 3. The konjac solution can be infiltrated.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a flowchart showing the flow of the asbestos removal method of the present invention. The asbestos removal method of this invention is performed through the konjac solution provision process 1, the asbestos layer peeling process 2, and the asbestos residue removal process 3 performed with respect to the asbestos layer adhering to the ceiling etc. Moreover, as shown in FIG. 2, after performing the asbestos layer wetting process 10, it can also carry out through the konjac solution provision process 11, the asbestos layer peeling process 12, and the asbestos residue removal process 13.

  FIG. 3 shows a first step of the asbestos removal method, and FIG. 3 (a) shows the ceiling portion 25 and the asbestos layer 21 attached to the ceiling. As the first step, the asbestos layer wetting step 10 is performed by first spraying water 24 onto the asbestos layer 21 adhering to the ceiling or the like with the spray device 50 as shown in FIG. . The injection device 50 includes a water tank 51, a pump 52, a hose 53, and a nozzle 54. The water in the water tank 51 is sucked and pressurized by the pump 52, and the pressurized water is sprayed from the nozzle 54 through the hose 53. In addition to water, a wetting agent liquid having a smaller volatility than water may be sprayed. This asbestos layer wetting step 10 makes it easier for the konjac solution to penetrate into the asbestos layer in the following konjac solution application steps 1 and 11.

  Next, as the second step, as shown in FIG. 4 (a), the konjac solution application steps 1 and 11 are made with a konjac solution 23 so that the konjac concentration sequentially increases, and the konjac solution is given in order of decreasing konjac concentration. The stepwise konjac solution 23 is sprayed onto the asbestos layer 21 by the spraying device 60 every 2 hours, for example. The injection device 60 includes a konjac solution tank 61, a pump 62, a hose 63, and a nozzle 64. The konjac solution in the konjac solution tank 61 is sucked and pressurized by the pump 62 and sprayed from the nozzle 64 through the hose 63. The Then, for example, a konjac / water ratio of 1: 9 is sprayed on the asbestos layer 21 and held for 2 hours, and then a konjac / water ratio of 3: 7 is sprayed on the asbestos layer 21. For 2 hours. Finally, the asbestos layer 21 is sprayed with a konjac to water ratio of 5: 5 and held for 6 hours. By mixing in this way, the konjac solution 23 is effectively infiltrated into the asbestos layer 21.

  When it is allowed to stand for about 6 hours from the last spraying of the konjac solution 23, the konjac solution 23 that has penetrated into the asbestos layer 21 is gelled and the asbestos layer portion becomes the gelled layer 22, as shown in FIG. The asbestos dust can be prevented or suppressed from being generated when the gelled layer 22 is semi-solid solution up to the inside.

  Next, as a third step, asbestos layer peeling steps 2 and 12 are performed, as shown in FIG. 5, the gelled layer 22 is peeled off or is likely to peel off, and there is a gap 29 between the construction surfaces 25a and 22a. Since it is made, the spatula 26 assists peeling from the construction surface. At the time of peeling, since it is left for about 6 hours for gelation in the second step, it is somewhat dry, so it is peeled off while spraying a konjac solution with a ratio of konjac to water of 5: 5, for example. And the effect which prevents that dust falls and makes it hard to take out dust arises.

And since the asbestos residue 27 remains in the flying surface (small hole) 25b of the ceiling concrete surface as shown in FIG. 6 in the construction surface 25a after the gelation layer 22 is peeled off, FIG. As shown in FIG. 4, as the fourth step, the asbestos residue removal steps 3 and 13 inject the dry ice particles 28 toward the construction surface 25a by the high-pressure injection device 70. The high-pressure injection device 70 includes a dry ice hopper 71, a compressor 72, a hose 73, and a nozzle 74, and can inject compressed air. That is, the dry ice particles 28 are sprayed from the dry ice hopper 71 through the hose 73 and the nozzle 74 together with the compressed air toward the construction surface 25a. At this time, when spraying the dry ice grains 28 after spraying the konjac solution with a ratio of konjac to water of 5: 5, the asbestos residue 27 can be prevented from being scattered again as dust. The asbestos residue 27 in the flying bubbles (small holes) 25b on the concrete surface is peeled off by the peeling action by spraying the dry ice grains 28 (for example, −78 ° C.). When the dry ice particles 28 are sprayed, the asbestos residue 27 is peeled off like a mist at a glance, and this is collected by the dust collector 80. The dust collector 80 includes a fan 81, a motor 82, a dust collector 83, and an exhaust port 84. When the motor 82 is driven, the fan 81 rotates, and the asbestos residue 27 is sucked together with the dry ice by the fan 81. The sucked gas passes through the exhaust port 84 of the dust collector 83 and is exhausted. Since dry ice sublimates, it does not remain as a waste material, and only asbestos residue 27 is collected. Further, the sprayed dry ice particles 28 can give an impact force necessary for peeling off the asbestos residue 27, and carbon dioxide gas sublimated in the flying bubbles (small holes) 25b of the construction surface 25a of the wall surface portion or the ceiling portion. Intrusion can make removal work easier.
In this manner, asbestos removal is achieved with substantially no asbestos remaining on the construction surface 25a of the ceiling portion 25.

The konjac solution is not limited to an aqueous solution of konjac flour obtained by drying and pulverizing konjac rice cake, and may be, for example, an aqueous solution of granulated konjac rice cake, an aqueous solution obtained by mixing and dissolving konjac rice cake paste or small chunks with water. Furthermore, not only water but also certain auxiliary agents such as dissolution aids that help dissolve konjac flour and penetration aids that increase the permeability to asbestos are added to water to dissolve the konjac flour konjac processed product. A konjac solution may be prepared.
Moreover, the application of the konjac solution to the asbestos layer can be applied by brushing or the like other than spraying, or the konjac solution can be applied to the asbestos with a rotary blade or the like.
Moreover, regarding the konjac liquid, for example, water may be heated from room temperature to a predetermined temperature (for example, around 40 ° C.), this hot water may be mixed with the konjac powder, and the konjac powder may be dissolved in the hot water. For example, after putting water in a predetermined tank and heating it with a heating device, konjac powder can be added and dissolved.
In addition, various changes, additions, omissions, and the like can be made without departing from the spirit of the present invention.

The flowchart which shows the flow of the asbestos removal method which concerns on this invention. The flowchart which shows 2nd Example of the flow of the asbestos removal method. Explanatory drawing which shows the 1st process of the asbestos removal method. Explanatory drawing which similarly shows a 2nd process. Explanatory drawing which similarly shows the 3rd process. The figure which shows the construction surface after asbestos layer peeling. Explanatory drawing which shows the 4th process of the asbestos removal method.

Explanation of symbols

1, 11 Konjac solution application process 2, 12 Asbestos layer peeling process 3, 13 Asbestos residue removal process 10 Asbestos layer wetting process 21 Asbestos layer 22 Gelling layer 23 Konjac solution 24 Water 25 Ceiling part 25a Construction surface 25b Flying bubbles (small holes) )
26 Spatula 27 Asbestos residue 28 Dry ice grains 50, 60 Injection device 70 High-pressure injection device 80 Dust collector

Claims (3)

A method for removing asbestos adhering to an asbestos construction surface of a ceiling, a wall, a beam, a pillar and other buildings,
The asbestos layer to be removed is infiltrated with a konjac solution, which is an aqueous solution of konjac koji powder, granules, surimi, small chunks, paste or extract, etc., to make the asbestos layer a semi-solid solution. A solution application step;
An asbestos layer peeling step for peeling the asbestos layer in the semi-solid solution state from the asbestos construction surface;
Asbestos residue remaining on the asbestos construction surface after peeling, including asbestos residue removal step of removing dry asbestos residue from the asbestos construction surface by spraying dry ice grains ,
In the konjac solution application step, the konjac solution is sprayed a plurality of times with a predetermined holding time on the asbestos layer, and the konjac concentration in the konjac solution is a mixture ratio of the konjac koji product. An asbestos removal method characterized by being raised stepwise in spraying konjac solution . A method for removing asbestos adhering to an asbestos construction surface of a ceiling, a wall, a beam, a pillar and other buildings,
A wetting step of supplying a wetting liquid such as water to the asbestos layer to be removed;
The wet asbestos layer is infiltrated with a konjac solution, which is an aqueous solution of konjac koji powder, grains, surimi, small chunks, paste or extract, to make the asbestos layer a semi-solid solution. Konjac solution application step,
An asbestos layer peeling step for peeling the asbestos layer in the semi-solid solution state from the asbestos construction surface;
Asbestos residue remaining on the asbestos construction surface after peeling, including asbestos residue removal step of removing dry asbestos residue from the asbestos construction surface by spraying dry ice grains ,
In the konjac solution application step, the konjac solution is sprayed a plurality of times with a predetermined holding time on the asbestos layer, and the konjac concentration in the konjac solution is a mixture ratio of the konjac koji product. An asbestos removal method characterized by being raised stepwise in spraying konjac solution . Spraying of the konjac solution is carried out at least twice at a predetermined time, and the konjac concentration in the first stage spray is such that the weight ratio of the processed konjac product to water is 0.5: 9.5. The konjac concentration in the last stage of spraying is selected in the range of 2: 8, and the weight ratio of the konjac koji processed product to water is selected in the range of 3: 7 to 7: 3 . Asbestos removal method.

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