Asbestos Removal System

Abstract

To enhance the convenience of an asbestos removal system.SOLUTION: An asbestos removal device 15 of an asbestos removal system 1 has: a casing that forms a closed space by covering an asbestos section attached to a wall W; and one or more nozzles that spray a liquid for stripping a coating material as mist into the closed space. A contaminated water discharge hose L21 has an outlet for discharging contaminated water containing stripped and pulverized asbestos from within the closed space. A jecter 16 is disposed in the path of the contaminated water discharge hose and has the function of sucking in the contaminated water and accelerating and discharging the sucked-in contaminated water. A first water storage tank 17 stores the contaminated water that has been discharged from the jecter 16 and passed through the contaminated water discharge hose.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an asbestos removal system. [Background technology]

[0002] Traditionally, asbestos has been attached to the walls, roofs, beams, etc. of buildings to improve properties such as fire resistance, heat insulation, and soundproofing. Asbestos is very light and easily dispersed. Asbestos also causes diseases such as lung cancer, pulmonary fibrosis, and mesothelioma. Therefore, there are technologies for removing asbestos when demolishing buildings (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-297884 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, asbestos causes diseases such as pulmonary fibrosis and mesothelioma, and therefore thorough prevention of exposure and scattering / leakage is required when removing asbestos during the demolition of buildings, etc. At the same time, efficiency and cost reduction in asbestos removal work are also important. Conventional technologies, including the above-mentioned Patent Document 1, have not been able to fully meet these demands. In other words, there has been a demand for improved convenience in asbestos removal systems.

[0005] The present invention aims to improve the convenience of asbestos removal systems. [Means for solving the problem]

[0006] In order to achieve the above object, an asbestos removal system according to one aspect of the present invention comprises: An asbestos removal device including: a casing that forms an enclosed space by covering a coating material containing a surface conditioner and asbestos attached to the wall of an outdoor building; and one or more nozzles that spray a liquid for removing the coating material as a mist into the enclosed space; A contaminated water discharge hose for discharging contaminated water containing the coating material peeled off and pulverized from the building in the closed space from the closed space; a conveying machine that is provided in the path of the contaminated water discharge hose and has the function of sucking in the contaminated water, accelerating the sucked in contaminated water, and discharging it; a storage tank that stores the contaminated water discharged from the conveyor and passed through the contaminated water discharge hose; Equipped with. [Effects of the Invention]

[0007] According to the present invention, the convenience of the asbestos removal system can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing an asbestos removal system according to one embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the rotary mist header in the asbestos removal system of FIG. 1. [Figure 3] FIG. 3 is a front view of the rotary mist header in the asbestos removal system of FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] First, with reference to FIG. 1, an asbestos removal system 1 according to one embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing an asbestos removal system according to one embodiment of the present invention.

[0011] The asbestos removal system 1 of this embodiment is configured to include a water source 11, a pump 12, a compressor 13, a control valve 14, an asbestos removal device 15, an injector 16, a first water storage tank 17, a pH treatment device 18, an activated carbon cylinder 19, a second water storage tank 20, and a generator 21.

[0012] The workers P1 to P3 are people who perform asbestos removal work using the asbestos removal system 1, and operate and monitor each component of the asbestos removal system. Specifically, for example, worker P3 is a nozzle man who holds asbestos removal device 15, presses it against wall W, and uses high-pressure water to spray and remove and collect the asbestos-containing coating material (hereinafter referred to as "removal work" as appropriate). As asbestos removal device 15 weighs approximately 8 kg (it feels heavier when water is passed through it), worker P3's working time is set at approximately 30 minutes continuously, and it is preferable for the removal work to be carried out seamlessly in three-person shifts (the three workers alternate between the roles of worker P1, worker P2, and worker P3). Worker P2 is a supervisor who checks that the operation and pressure of control valve 14 are normal near control valve 14, and also performs supervisory duties such as emergency stopping of the water flow and compressed air of pump 12 and compressor 13 using the remote control switch attached to control valve 14 if there is any abnormality with worker P3 (nozzle man). Although worker P1 (operator), who will be described later, can also perform an emergency stop, in many cases workers P1 and P3 are in blind spots with each other, and worker P2 is necessary to ensure safety. The worker P1 is an operator who is in charge of managing the pump 12 and the compressor 13, and maintaining the voltage, air pressure, and water flow normally. In addition, workers P1 and P2 constantly check the condition of the connections (such as the various hoses and connectors described below) and manage the collected waste. Management here includes checking whether collection tanks such as the first water storage tank 17 and the second water storage tank 20 are overflowing, checking the operation of the water treatment equipment in area R described below, and bagging the residue after water treatment (asbestos-containing waste). Although someone is always performing the peeling work, managing the pressure, etc., and managing waste and connections, the physical burden on workers P1 and P2 other than worker P3 is light. Starting about one hour before the end of work, workers P1, P2, and P3 start cleaning and tidying up, performing machine maintenance, and bagging the waste.

[0013] The water source 11 is a water supply source. Here, the water may be any water that can be used by a pump 12 (described later) or the like, and may be, for example, tap water or well water.

[0014] The pump 12 pumps water from the water source 11 at high pressure to a control valve 14, which will be described later. Specifically, for example, the maximum water pressure of the pump 12 is 245 MPa, and this cannot be exceeded. Furthermore, like most machines, the asbestos removal device 15 will have a shorter lifespan if it is operated continuously at maximum output. Empirically, the pressure required to remove the coating material from the wall W is 180 MPa or higher (depending on the thickness of the coating; a reference value is 3 to 5 mm thick); pressures below this are likely to leave some of the coating unscraped. An actual operating pressure of around 200 to 220 MPa is recommended. This is because the amount of water used by the asbestos removal device 15 is about 6 liters per minute, as described below. The more water used, the greater the abrasive power, but the small amount of water is compensated for by compressed air from the compressor 13 (as shown in Figure 3 described below, the nozzle head 321 to which the nozzle 32 is attached is rotated by wind instead of water flow).

[0015] The compressor 13 sends ambient air at high pressure to the control valve 14 and the injector 16 (described later) to supply air for rotating the nozzle head 321 (blade rotation) of the asbestos removal device 15 (described later) and for suctioning wastewater by the injector 16 (described later). Although not shown, the compressor 13 is equipped with a 20 HP compressor aftercooler.

[0016] The control valve 14 regulates (controls) the water and air pumped from the pump 12 and compressor 13, respectively, and sends them to the asbestos removal device 15. Here, regulation (control) refers to the degree of pressure reduction (regulation) for the water and air, and switching whether or not to send them. The control valve 14 also serves as a safety device that detects whether the entire asbestos removal system 1 of this embodiment is functioning normally.

[0017] The asbestos removal device 15 is a device that removes coating materials containing asbestos from the walls W of outdoor buildings. As will be described in more detail below, the asbestos removal device 15 has a nozzle head (for example, nozzle head 321 in FIG. 3) that rotates using air pressure-fed from the compressor 13 via an air hose L12. The nozzle head (for example, nozzle head 321 in FIG. 3) also has a nozzle (for example, nozzle 32 in FIG. 3) that sprays water or the like pressure-fed from the pump 12 via a liquid supply hose L11. When the asbestos removal device 15 is applied to a wall W that is the target of construction and has asbestos attached, a mist of water is sprayed from the nozzle of the rotating nozzle head, thereby removing the coating material containing asbestos from the wall W.

[0018] Here, the asbestos removal device 15 of this embodiment is characterized in that it discharges a small amount of water for outdoor use. Specifically, because the nozzle head is rotated by air, less water is used and less wastewater is discharged compared to systems that use water pressure to rotate the nozzle head.In addition, the water used for stripping is not simply high-pressure water used in high-pressure washing, but is sprayed as a mist, so less wastewater is discharged.

[0019] Furthermore, as will be described in detail later, the contaminated water containing the peeled and pulverized asbestos is discharged from a contaminated water discharge hose L21 connected to the asbestos removal device 15. At this time, the contaminated water containing the peeled and pulverized asbestos is basically drained according to gravity, that is, according to the gradient of the contaminated water discharge hose L21.

[0020] The injector 16 is a conveying machine that has the function of sucking in contaminated water using the force of compressed air sent from the compressor 13 via the air hose L22, and accelerating and discharging the sucked in contaminated water. That is, the injector 16 sucks in the contaminated water that has naturally flowed down and accumulated in the contaminated water discharge hose L21 from the connection port to which the contaminated water discharge hose L21 is connected, and accelerates and discharges it from the connection port to which the drainage hose L3 is connected. This allows the contaminated water discharged from the asbestos removal device 15 to overcome gravity and climb over the wall of the first water storage tank 17, which will be described later. It is preferable that the inlet (the inlet connected to the contaminated water discharge hose L21) through which the object to be transported (here, contaminated water) flows in and the inlet (the inlet connected to the drainage hose L3) through which the object to be transported is discharged are arranged in a straight line in the injector 16. This improves the transport capacity of the exfoliated and pulverized asbestos contained in the contaminated water.

[0021] That is, an injector 16 is installed between the asbestos removal device 15 and the first water storage tank 17. The asbestos removal device 15 is connected to the injector 16 by a contaminated water discharge hose L21, and the contaminated water discharged from the injector 16 is transported to the first water storage tank 17 via the drainage hose L3. In this way, the contaminated water in the closed space S is stored in the first water storage tank 17.

[0022] The first water storage tank 17 is a tank that stores contaminated water discharged from the asbestos removal device 15. The first water storage tank 17 is in the form of a container with an open top that is ready for transportation when empty.

[0023] In the first water storage tank 17, heavy impurities in the stored contaminated water settle to the bottom layer, while light impurities rise to the top layer, leaving impurity-free circulating water in the middle layer. Impurities including asbestos are removed by a pH treatment device 18 and an activated carbon cylinder 19.

[0024] The pH treatment device 18 is a device that adjusts the pH value of the contaminated water stored in the first water storage tank 17 before discharging it into a street drain or the like for disposal. The activated carbon cylinder 19 is a cylinder used in the treatment of contaminated water in the pH treatment device 18, contains activated carbon, and has the function of filtering out asbestos and the like. In this way, the contaminated water is treated by the pH treatment device 18 and the activated carbon cylinder 19 until it reaches a level where it can be disposed of.

[0025] The second water storage tank 20 is a tank for storing the contaminated water after it has been treated by the pH treatment device 18 and the activated carbon cylinder 19. The contaminated water stored in the second water storage tank 20 is disposed of appropriately.

[0026] The generator 21 generates electric power to drive the pump 12, the compressor 13, the control valve 14, the pH treatment device 18, and the like.

[0027] In this way, the asbestos removal system 1 of this embodiment accelerates the contaminated water from the asbestos removal device 15 using the injector 16, flows it over the wall of the first water storage tank 17, and stores it inside the first water storage tank 17, and then treats and disposes of the contaminated water.

[0028] In conventional asbestos removal systems that employ the "high-pressure water washing method," in which water is pressurized and sprayed onto asbestos painted on outdoor walls and other structures, the contaminated water discharged from the designated equipment for asbestos removal is sucked up and disposed of using vacuum trucks or similar. Furthermore, the designated equipment for conventional asbestos removal requires a large amount of water. Therefore, when using vacuum trucks to suck up the waste, if the work area is large, multiple vacuum trucks must be kept on standby, or if the work area is not that large, one vacuum truck must be rotated multiple times to suck up the waste as needed.

[0029] Furthermore, according to the Ministry of Health, Labor and Welfare and the Ministry of the Environment's "Comprehensive Manual for Preventing Asbestos Exposure and Asbestos Scattering and Leakage During the Demolition of Buildings, etc.", when using a vacuum truck, it is recommended that it be equipped with a HEPA filter with dust collection capabilities. In other words, since vacuum trucks drain contaminated water while venting the tank, the HEPA filter should prevent asbestos from scattering. However, it is said that there are only around 10 vacuum trucks with HEPA filters in Japan, and in reality, such vacuum trucks are not being used.

[0030] In addition, the contaminated water sucked up by the vacuum truck needs to be disposed of so that the vacuum truck can be reused, but in the past, the water was drained from the vacuum truck by gravity into a pool made of blue tarps or similar, and the water collected in the pool was then pumped out and treated as needed. However, this type of drainage method resulted in the contaminated water scattering, and the current situation was that it was not possible to prevent the scattering and exposure of asbestos.

[0031] In contrast to this, the asbestos removal system 1 of this embodiment employs an asbestos removal device 15 that requires less water discharge for outdoor use. Also, the use of an injector 16 eliminates the need for a vacuum truck. Specifically, for example, in conventional asbestos removal systems, the typical vacuum truck used for wastewater treatment needs to store about 3 cubic meters of wastewater per use. Conventional asbestos removal systems use a large amount of water, for example, about 26 liters per minute, so they need to drain about 10 cubic meters in six hours (the approximate construction work time for one day). Therefore, in places where the work area is not that large, the vacuum truck will have to make three to four trips. This means that the vacuum truck has to make multiple trips, which leads to "time loss." In contrast to this, in the asbestos removal system 1 of this embodiment, the injector 16 can discharge water while remaining connected even during the drainage treatment, so there is no "time loss" such as when replacing a vacuum truck. In addition, there is no need to prepare a special vacuum truck, and no space is required for the vacuum truck to enter and exit. Furthermore, since the Injector 16 is much smaller than a vacuum truck, it requires less installation space than conventional asbestos removal systems. Furthermore, the area R for treating contaminated water, which includes the first water storage tank 17, the pH treatment device 18, and the second water storage tank 20, is compact. Specifically, for example, the asbestos removal system 1 of this embodiment employs an asbestos removal device 15 that discharges a small amount of water for outdoor use, and therefore only requires 6 liters of water per minute for wastewater treatment. In other words, the asbestos removal system 1 of this embodiment discharges just over 2 cubic meters of water in 6 hours (approximately the construction work time per day), which is one-fifth the amount of water discharged by conventional asbestos removal systems. Therefore, a generally commercially available, compact "2 cubic meter water storage tank" can be used as is for the first water storage tank 17 and second water storage tank 20, which directly discharge the wastewater. Even if a conventional asbestos removal system uses a water tank instead of a vacuum truck for wastewater treatment, a very large water tank of, say, 10 cubic meters would be required to accommodate the large amount of wastewater, as mentioned above. In summary, in the asbestos removal system 1 of this embodiment, the area R is compact, making it possible to easily protect the area R. This prevents asbestos from scattering and exposure. Furthermore, in the asbestos removal system 1 of this embodiment, all that is required is a small space to place a small injector 16, which eliminates the need for a vacuum truck, and a compact area R, making it possible to carry out asbestos removal even in places such as urban areas where buildings are close together and large yards for construction are not available.

[0032] Here, the asbestos removal device 15 used in the asbestos removal system of this embodiment will be described in detail with reference to FIGS. 2 and 3. FIG. FIG. 2 is a side view of the rotary mist header in the asbestos removal system of FIG. 3 is a front view of the rotary mist header in the asbestos removal system of FIG. 2. FIG.

[0033] First, an overview of the asbestos removal device 15 will be described. As shown in Figures 2 and 3, the asbestos removal device 15 includes a casing 31 that forms a closed space S (see Figure 4) by covering a coating material (see Figure 2) that has adhered to a wall W of various buildings, such as a wall surface, roof, or beam (hereinafter referred to as "wall W"), and one or more nozzles 32 that spray a mist of a liquid such as water or a treatment agent (hereinafter referred to as "water") into the closed space S to peel the coating material from the wall W.

[0034] The asbestos removal device 15 further includes a liquid supply hose L11 for supplying water to the nozzle 32. The asbestos removal device 15 further includes a contaminated water discharge hose L21 for discharging from the closed space S contaminated water in which asbestos has been peeled off from the wall W and crushed within the closed space S and adhered to the mist.

[0035] The asbestos removal device 15 will be described in detail below. The casing 31 has a disk-shaped base portion 311 that faces the coating material when the asbestos removal device 15 removes the coating material adhered to the wall W (in use), and an annular peripheral wall portion 312 that protrudes from the outer periphery of the base portion 311 toward the coating material in use. The casing 31 further has a pair of rod-shaped handles 313, a brush 314 that provides an airtight and watertight shield between the inside and outside of the closed space S, and three or more adjusters 115.

[0036] 2 and 3, the pair of handles 313 are arranged in a V-shape away from the base portion 311. Each handle 313 is fixed by a pair of rod-shaped supports 113a. The base end of each support 113a is fixed to the peripheral wall portion 312, and the tip end protrudes beyond the base portion 311 to fix the handle 313. The pair of V-shaped handles 313 are arranged so that the narrow side is located on the upper side and the wide side is located on the lower side when in use.

[0037] The brush 314 protrudes in an annular shape from the edge of the peripheral wall portion 312 of the casing 31, and is flexible enough to bend. When in use, the tip of the brush 314 comes into close contact with the coating material (including asbestos) attached to the wall W, thereby maintaining the airtightness and watertightness of the closed space S. Even if the coating material is attached to a beam with bolts or the like, and the head of the bolt or the like protrudes from the wall W, the brush 314 flexes, thereby maintaining the airtightness and watertightness of the closed space S.

[0038] The adjuster 115 adjusts the position of the casing 31 from the coating material so that the tip of the brush 314 is in close contact with the coating material. The adjuster 115 includes an L-shaped bracket 115a fixed to the peripheral wall 312 of the casing 31, and an axial member 115b attached to the bracket 115a so as to fit along the peripheral wall 312 of the casing 31. The base end of the axial member 115b is formed with a male screw so that its fixed position relative to the bracket 115a can be adjusted. The male screw is fixed to the bracket 115a with a nut 115c. The tip end of the axial member 115b is formed with a curved surface so as to make point contact with the coating material. For example, the tip of the axial member 115b may be equipped with a ball that rotates and is exposed only at the tip, allowing it to move smoothly over the coating material.

[0039] Water is supplied to the nozzle 32 from the liquid supply hose L11. For this purpose, a supply connection port 316 for the liquid supply hose L11 is provided in the center of the base portion 311 of the casing 31. The liquid supply hose L11 and the supply connection port 316 are connected by a rotary joint, allowing the connection portion of the liquid supply hose L11 to swing. The liquid supply hose L11 is flexible.

[0040] Water supplied from the liquid supply hose L11 is sprayed as mist by the nozzles 32. As shown in Fig. 4, a plurality of nozzles 32 are attached to a rod-shaped nozzle head 321 that rotates inside the casing 31. A conduit (not shown) is provided inside the nozzle head 321 so that the supply connection port 316 of the liquid supply hose L11 and the nozzles 32 communicate with each other.

[0041] The center of the nozzle head 321 is rotatably supported at the center of the base portion 311. For example, a total of six nozzles 32 are attached, three on each side of the tip from the center of the nozzle head 321. However, the distance from the center to each nozzle 32 is different, and when the nozzle head 321 rotates, the mist is sprayed in six overlapping circles onto the coating material.

[0042] In this embodiment, six nozzles 32 with a nozzle diameter φ of 0.2 mm are used, but this is not a limitation. For example, nozzles with a nozzle diameter φ of 0.25 mm may be used in combination or in combination depending on the situation. Specifically, for example, nozzles with a nozzle diameter φ of 0.25 mm may be used for the two outer nozzles 32, and nozzles with a nozzle diameter of 0.2 mm may be used for the four inner nozzles 32. However, as the number of holes and the diameter of the holes become smaller, the pressure sprayed from each nozzle 32 increases, but the nozzles 32 become more worn and the amount of water used also decreases. (Conversely, if the nozzle diameter φ is increased, the total amount of water remains the same (maximum 6 liters) and the pressure at each point decreases, resulting in a reduced separation ability.) Therefore, it is optimal to use six nozzles 32 with a nozzle diameter φ of 0.2 mm. The above values apply to RC (reinforced concrete) buildings, and pressure adjustment is necessary if used with steel (steel frame) or wooden structures, as the water pressure will instantly destroy the structure. However, use at very low pressures (around 150 MPa or less) is not recommended as the pump 12 will not be able to maintain a stable, normal pressure due to its performance.

[0043] In order to spray mist from the nozzle 32, the base portion 311 of the casing 31 is provided with an air hose connection port 317 to which an air hose L12 for supplying high-pressure air is connected. A conduit (not shown) is provided within the nozzle head 321 to connect the air hose connection port 317 and the nozzle 32. Therefore, the nozzle head 321 is provided with a conduit through which water flows and a conduit through which high-pressure air flows. The base portion 311 of the casing 31 is provided with an exhaust port 318 adjacent to the air hose connection port 317. Only high-pressure air not used to generate mist is released through the exhaust port 318. The high-pressure air supplied from the air hose L12 is also used as a power source to rotate the nozzle head 321.

[0044] The mist is sprayed by pressing a switch provided on each handle 313. When the switch is pressed, the nozzle head 321 rotates. When both switches on the handles 313 are pressed, water is supplied from the liquid supply hose L11 to the nozzle 32, and high-pressure air is supplied from the air hose L12 to the nozzle 32. The high-pressure water and high-pressure air collide within the nozzle 32, breaking down the water into fine particles and forming a mist containing numerous water particles, which is sprayed from the nozzle 32 at a pressure (high pressure) of about 100 to 300 MPa.

[0045] The mist, sprayed at high pressure, is sprayed onto the coating material adhering to the wall W. This coating material peels off from the wall W, breaks down, and becomes a powdery material containing powdered asbestos. The powdery material adheres to the mist, turning into contaminated water (not shown), which is a thick, stagnant liquid like mud. This contaminated water is discharged from the enclosed space S by the contaminated water discharge hose L21. The peripheral wall portion 312 of the casing 31 is provided with a discharge connection port 319 to which the contaminated water discharge hose L21 is connected. The discharge connection port 319 is positioned so that it leads out from the bottom when in use. The contaminated water discharge hose L21 is a flexible bellows hose with a larger diameter than the liquid supply hose L11.

[0046] Next, an asbestos removal method using the asbestos removal device 15 used in the asbestos removal system of this embodiment will be described. Worker P3 grasps the handle 313 of the asbestos removal device 15 and aims the tip of the adjuster 115 at the coating material adhering to the wall W. In this state, the tip of the brush 314 comes into close contact with the coating material. When worker P3 presses both switches on each handle 313, water is sucked into the liquid supply hose L11 and high-pressure air is sucked into the air hose L12, and high-pressure mist is sprayed from the nozzle 32. Excess high-pressure air is exhausted from the exhaust port 318.

[0047] At the same time, the nozzle head 321 is rotated by the high-pressure air. Multiple nozzles 32 are arranged on the nozzle head 321, facing in opposite directions at different distances from each nozzle 32. Therefore, the mist is sprayed in a planar form toward the coating material within the closed space S. When the high-pressure mist is sprayed, the coating material is peeled off from the wall W and pulverized, becoming a powdery material containing pulverized asbestos.

[0048] This asbestos-containing powder mixes with the mist within the closed space S. When the asbestos-containing powder adheres to the mist, contaminated water that resembles a thick, stagnant liquid like mud is produced. By spraying mist into the closed space S, no excess water is produced. The contaminated water is discharged from the closed space S into the contaminated water discharge hose L21.

[0049] As the worker P3 gradually moves the casing 31 along the wall W, the coating material adhering to the wall W is removed over a wide area. The brush 314 bends as the casing 31 moves. Therefore, the airtightness and watertightness of the closed space S are maintained, and the broken powder and contaminated water do not leak from inside the closed space S to the area around the casing 31. Therefore, the worker P3 does not inhale asbestos.

[0050] The contaminated water discharged into the contaminated water discharge hose L21 is accelerated by the injector 16, overcomes the wall of the first water storage tank 17 against gravity, and flows into the first water storage tank 17 where it is stored. In the contaminated water, heavy impurities settle to the bottom and light impurities rise to the top, and impurity-free circulating water separates into the middle layer. Impurities including asbestos are treated in the treatment device 7. The treated water, which no longer contains asbestos, is discharged.

[0051] Here, the features of the asbestos removal system 1 of this embodiment (hereinafter referred to as the "mist jet method") will be described.

[0052] As described above, the asbestos removal system 1 can remove asbestos from the exterior walls W of a building, but here we will explain how asbestos is attached to the exterior walls W of a building and how it should be treated. Asbestos is applied to exterior walls W as an asbestos-containing coating material. For example, RC exterior wall finishing coating material (level 3) is used as this coating material. In other words, the asbestos removal system 1 removes the asbestos-containing coating material and collects it as contaminated water. The asbestos-containing coating material contains a base material, aggregate, top coating material, and a surface conditioner that acts as an adhesive.

[0053] The main material, aggregate, and topcoat can be removed using the traditional asbestos removal methods of "hand scraping" and "disc grinder." However, removing the surface preparation agent using "hand scraping" or "disc grinder" requires an extremely large amount of time, effort (and cost).

[0054] The high-pressure water washing method can remove surface preparation agents in a short time by using high-pressure water washing. However, even if the high-pressure water washing method is simply adopted, there is an issue that the removed surface preparation agent clogs the piping when it is sucked up, and does not flow to the water storage tank. Therefore, the "existing high-pressure water washing method" employed in the conventional asbestos removal system described above uses large amounts of water, allowing the removed coating material and surface conditioner to be pumped into a vacuum truck through pipes. However, even with conventional asbestos removal systems, it is theoretically possible to use a water storage tank located at the construction site without using a vacuum truck. However, as mentioned above, this requires a very large water storage tank, making it impractical unless a large area of land, such as an urban area, is available for the construction site. Furthermore, because contaminated water contains asbestos, it cannot be disposed of as simple water; it must undergo specific water treatment before disposal. As a result, the "existing high-pressure water washing method" uses large amounts of water, which increases the cost of contaminated water treatment. Furthermore, even after the required water treatment, the more wastewater is discharged, the greater the environmental impact.

[0055] For this reason, the "Mist Jet Method" has the following first to fourth characteristics. That is, the first feature is that, as mentioned above, there are specific characteristics to the objects to be removed, and the "Mist Jet Method" is a method optimized for those specific characteristics. The "Mist Jet Method" uses water and "wind" to remove the "main material, aggregate, and top coat" contained in the asbestos-containing coating material, as well as the "surface adjuster" that acts as an adhesive. This allows the removed coating material and surface adjuster to be poured into the compact No. 1 Water Storage Tank 17, etc., with a small amount of water, without clogging the drainage pipes and drainage pipes (contaminated water discharge hose L21, drainage hose L3, etc.).

[0056] The second feature is that for outdoor use, the "Mist Jet Method" can solve the drawbacks of the "existing high-pressure water washing method," which are "the use of large amounts of water" and "the production of large amounts of contaminated water, which increases the cost of treating the contaminated water."

[0057] The third feature is that the "mist jet method" differs from the "existing high-pressure water washing method" in the following ways. The "existing high-pressure water washing method" is a method of removing asbestos attached to outdoor walls W by peeling it off with the water pressure and then discharging it using the amount of water. In contrast, the "Mist Jet Method" is similar to the "existing high-pressure water washing method" in that it uses water pressure to remove asbestos attached to the wall W by peeling it off. However, it is significantly different in that the removed material is removed by using a balanced combination of water and wind power. In other words, the biggest difference from existing high-pressure water washing methods is that the discharge method uses "wind power" in addition to water.

[0058] In other words, "existing high-pressure water washing methods" do not use "wind power," but rather the water pressure of large amounts of water. In contrast, the asbestos removal system 1 uses "wind power," and as mentioned above, does not use the water pressure of large amounts of water, which has the effect of reducing the amount of contaminated water discharged compared to "existing high-pressure water washing methods." The "wind power" referred to here is utilized not only by the asbestos removal device 15, but also by the Injector 16. Details of the "wind power" used by the Injector 16 will be described later as the fourth feature.

[0059] Reducing the amount of contaminated water also has the following effects: In other words, the "Mist Jet Method" reduces the amount of contaminated water produced and is a method that reduces the burden on the environment. In other words, the "Mist Jet Method" is an environmentally friendly method that uses less water. In addition, the "Mist Jet Method" reduces the amount of contaminated water, and is a method that can reduce wastewater treatment costs. In other words, if less water is used, the amount of wastewater will also be reduced. Therefore, the cost of treating contaminated water can be reduced.

[0060] Furthermore, because contaminated water is considered "asbestos-containing waste," its treatment is more costly than normal wastewater. Details on how to handle "asbestos-containing waste" in Japan can be found in the "Manual for the Treatment of Asbestos-Containing Waste" provided by the Ministry of the Environment. Specifically, to cite an excerpt, it states that a melting or detoxification facility is required to treat "asbestos-containing waste," and that "(6) when wastewater is discharged from the facility, the necessary wastewater treatment equipment must be installed to ensure that the water quality does not pose a hindrance to the preservation of the living environment."

[0061] As such, removing asbestos from contaminated water (wastewater) is very expensive. This cost is borne by the client / end user. In other words, the cost of treating contaminated water affects the overall final demolition costs that users must pay. For this reason, it is important to keep wastewater treatment costs as low as possible.

[0062] The fourth feature is that the "mist jet method" is a technology that utilizes the "air volume" created by combining the injector 16, control valve 14, and compressor 13. Furthermore, "optimizing" the air volume and water volume cannot be achieved simply by using the injector 16. By using a combination of the compressor 13 and control valve 14 in addition to the injector 16, it becomes possible to optimize the air volume and water volume. In other words, by using the control valve 14 to "optimize" the air volume and water volume, it becomes possible to realize a more public and specialized discharge of the removed asbestos-containing coating material as described above.

[0063] Here, the specifications required for the compressor 13 and the injector 16 to discharge the coating material containing the removed asbestos are, for example, as follows. The air for the injector 16 is officially required to have a power of 15 horsepower or more. Therefore, for example, a 35 horsepower engine-type compressor may be used as the compressor 13.

[0064] The compressor 13 also functions as a control center for optimizing the air and water volumes. As described above, by combining the "optimal specification compressor" and control valve 14 with the "optimal specification injector 16" to discharge the removed asbestos-containing coating material, it is possible to discharge less water than with existing high-pressure water washing methods.

[0065] Furthermore, the asbestos removal system 1 of this embodiment will be compared below with a conventional asbestos removal system that is another example of the conventional example described above. Another example of a conventional asbestos removal system is the system disclosed in Japanese Patent Laid-Open No. 2008-196132 (hereinafter referred to as the "conventional publication"). As shown in Figure 1 of the prior publication, this other example of a conventional asbestos removal system is designed to be used inside a room (indoors) of an existing building where asbestos-containing materials are installed in the ceiling or walls. Therefore, hereinafter, this other example of a conventional asbestos removal system will be referred to as the "conventional indoor asbestos removal system."

[0066] The asbestos removal system 1 of this embodiment for outdoor use is intended to be used outdoors, that is, to remove coating materials containing asbestos, such as RC exterior wall finishing coating materials (level 3) applied to exterior walls. Here, Level 3 and Level 1 (described below) refer to the level of strictness of regulations imposed by the Ministry of Land, Infrastructure, Transport and Tourism of Japan (https: / / www.mlit.go.jp / jutakukentiku / build / Q&A / index.html#a8). As mentioned above, Level 3 coating materials also contain surface preparation agents, making them difficult to remove using the "hand scraping method" or "disc grinder method." Therefore, removing Level 3 coating materials requires high water pressure and volume of water exceeding 100 MPa. For this reason, the "contaminated water" containing the removed asbestos must be discharged outdoors. For this reason, the asbestos removal system 1 of this embodiment is provided with an injector 16, a first water storage tank 17, a pH treatment device 18, an activated carbon cylinder 19, and a second water storage tank 20.

[0067] In contrast, conventional indoor asbestos removal systems are designed to remove asbestos-containing materials such as steel fireproof coating materials (Level 1) attached to indoor structures such as ceilings and walls. In other words, the asbestos-containing materials in question are at a level that can be removed using the conventional "hand scraping method" mentioned above. For this reason, with conventional indoor asbestos removal systems, when spraying water or suspended water to remove asbestos-containing material adhering to a structure, the water pressure does not need to be very high (for example, about 10 MPa is sufficient), and only a small amount of water is used. Therefore, conventional indoor asbestos removal systems do not require piping or water storage tanks to drain the sprayed water or suspended water. In this regard, even in publicly known documents, there is no specific description of how to handle sprayed water or suspended water.

[0068] Here, conventional indoor asbestos removal systems also have an injector, but they are simply used as a normal air conveyor 92. In other words, conventional indoor asbestos removal systems aim to improve visibility indoors (inside the room), and remove the exfoliated asbestos-containing material (solids) by conveying it together with air using the air conveyor 92. Specifically, quoting from a publicly known document, paragraph

[0026] states, "...By spraying water or suspended water from the spray nozzle 5a onto asbestos-containing material adhering to the ceiling, wall, etc., the asbestos-containing material is peeled off from the wall, etc. The peeled asbestos-containing material either becomes dust and floats, or falls to the floor." Paragraph

[0027] states, "Therefore, the spraying of water or suspended water from the spray nozzle 5a causes floating matter such as dust particles of asbestos-containing materials to float within the chamber 1, which is the work space. However, such floating matter is sucked up through the suction port 7a of the suction member 7 by the pressure-feeding device 9, and then pressure-fed to the recovery device 10, where it is packed into bags 105 and recovered. Therefore, the floating and scattering of dust particles of asbestos-containing materials within the chamber 1 is suppressed, and visibility is improved."

[0028] states, "Once the removal work is completed, the removed asbestos-containing material is raked up using earthwork board 4c. Next, a bucket 6 is attached to the tip of articulated arm 4b of robot 4 in place of spray device 5, and piping 9a is connected to duct 8b of hopper 8. The asbestos-containing material that has been raked up on the floor is then scooped up using bucket 6 and dumped into hopper 8. The asbestos-containing material dumped into hopper 8 is pressurized by pressure transfer device 9 to recovery device 10, where it is packed into bags 105 and recovered."

[0069] In contrast, the outdoor asbestos removal system 1 of this embodiment requires the "contaminated water" containing the removed asbestos to be discharged outdoors, so although it only requires an overwhelmingly smaller amount of discharged water compared to the conventional outdoor asbestos removal system described above (thus eliminating the need for a vacuum truck), it does have contaminated water discharge hoses L21 and L3 and a first water storage tank 17. However, it is difficult for the "contaminated water" to defy gravity and overcome the wall (height) of the first water storage tank 17 and be drained using only the contaminated water discharge hoses L21 and L3 and the first water storage tank 17. Therefore, the asbestos removal system 1 of this embodiment employs the injector 16 not for the usual purpose of simply transporting "air," but for a purpose newly devised by the inventor, which is to transport and deliver "contaminated water" to the first water storage tank 17. In this regard, as mentioned above in the fourth feature, it is preferable to combine not only the injector 16 but also the control valve 14 and compressor 13. Here, "contaminated water" includes not only water or suspended water containing asbestos scraped off by water pressure, but also mist containing air containing dispersed asbestos.

[0070] Thus, in conventional indoor asbestos removal systems, the air conveyor 92 as an injector is employed for the purpose of "transporting the air containing dispersed asbestos." In other words, the concept of employing the air conveyor 92 for the purpose of distributing the "water or suspended water" sprayed by the spray nozzle 5a has not been disclosed, let alone suggested, in the prior art publications. In contrast to this, in the asbestos removal system 1 of this embodiment, an injector 16 is employed based on a newly devised idea by the inventor of utilizing two elements, the water pressure and the air of the injector 16, for the purpose of draining "contaminated water," and further, a combination of the injector 16 with a control valve 14 and a compressor 13 is also employed.

[0071] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention.

[0072] an asbestos removal device (e.g., asbestos removal device 15 in FIGS. 1 to 3) including a casing (e.g., casing 31 in FIGS. 2 and 3) that forms an enclosed space by covering a coating material containing a surface conditioner and an asbestos layer that is attached to an outdoor wall of a building (e.g., the coating material (hatched area) attached to wall W in FIG. 1), and one or more nozzles (e.g., nozzle 32 in FIG. 3) that spray a liquid for removing the coating material as a mist into the enclosed space; A contaminated water discharge hose (for example, the contaminated water discharge hose L21 in FIGS. 2 and 3) for discharging contaminated water containing the coating material peeled off and crushed from the wall in the closed space from the closed space; A conveying machine (e.g., the injector 16 in FIG. 1) that is installed in the path of the contaminated water discharge hose (e.g., between the hose consisting of the path of the contaminated water discharge hose L21 and the path of the drainage hose L3 in FIG. 1) and has the function of sucking in the contaminated water, accelerating the sucked in contaminated water, and discharging it; a storage tank (for example, the first water storage tank 17 in FIG. 1) for storing the contaminated water discharged from the conveyor and passed through the contaminated water discharge hose; It is enough to have this.

[0073] The casing of the asbestos removal device includes: a supply connection port (for example, the supply connection port 316 in FIG. 2) for connecting a liquid supply hose (for example, the hose L11 in FIGS. 1 to 3) for supplying the liquid to the nozzle; A discharge connection port (e.g., discharge connection port 319 in FIG. 2) to which the contaminated water discharge hose is connected; The device may further include:

[0074] Furthermore, a nozzle head (for example, nozzle head 321 in FIG. 3) that rotates the nozzle within the casing may be provided.

[0075] A plurality of the nozzles are arranged in each direction from the center of the rotating nozzle head, and the distance from the center to each nozzle can be made different.

[0076] an air hose connection port for connecting an air hose for supplying high-pressure air to the nozzle for turning the liquid into mist; an exhaust port for reducing the pressure of the high-pressure air; The device may further include:

[0077] Furthermore, the pressure of the mist sprayed from the nozzle can be set to 100 to 300 MPa. [Explanation of symbols]

[0078] 1. Asbestos removal system 11...water source 12 Pump 13. Compressor 14. Control valve 15 Rotary mist header 16. Injector 17. First Water Tank 18 pH treatment equipment 19. Activated carbon cylinder 20. Second water tank 21. Generator 311···Casing 311··Base section 312...Peripheral wall part 313··Handle 314··Brush 316··Supply connection port 317··Air hose connection port 318··Exhaust port 319··Discharge connection port 32 Nozzle 321··Nozzle head L11 Fluid supply hose L12...Air hose L21 Contaminated water discharge hose 2. Water tank A...Painting material S...Closed space W····Wall (building)

Claims

1. an asbestos removal device including: a casing that forms an enclosed space by covering a coating material containing a surface conditioner and asbestos that has adhered to the wall of an outdoor building; one or more nozzles that spray a liquid for removing the coating material as a mist into the enclosed space; and an air hose connection port that connects an air hose that supplies first high-pressure air to the nozzle to turn the liquid into the mist; A contaminated water discharge hose for discharging contaminated water containing the coating material peeled off from the wall and crushed in the closed space and air based on the first high-pressure air from the closed space; a conveying machine that is provided in the path of the contaminated water discharge hose and functions as an injector that sucks in the contaminated water and expels it at an accelerated rate, the conveying machine having a suction port that sucks in the contaminated water and a discharge port that expels the contaminated water arranged in a straight line, the conveying machine having an air passage through which second high-pressure air supplied from outside passes, the conveying machine sucking in the contaminated water by the negative pressure generated by the second high-pressure air passing through the air passage, and accelerating the contaminated water by the flow of the second high-pressure air and expelling it from the discharge port; a storage tank that stores the contaminated water discharged from the conveyor and passed through the contaminated water discharge hose; a compressor that pressurizes ambient air to generate the first high-pressure air and the second high-pressure air, and pressure-feeds the first high-pressure air to the nozzle via the air hose and pressure-feeds the second high-pressure air to the conveying machine; a control valve that controls the pressure of the first high-pressure air sent from the compressor and sends the first high-pressure air to the nozzle through the air hose; Equipped with The conveying machine sucks the contaminated water from a connection port to which the contaminated water discharge hose is connected, and accelerates and discharges the contaminated water into the storage tank through a connected drainage hose, thereby causing the contaminated water to flow over the wall of the storage tank against gravity. Asbestos removal system.

2. The casing of the asbestos removal device includes: a supply connection port for connecting a liquid supply hose for supplying the liquid to the nozzle; a discharge connection port for connecting the contaminated water discharge hose; Further provided with 10. The asbestos removal system of claim 1.

3. a nozzle head that rotates the nozzle within the casing; 10. The asbestos removal system of claim 1.

4. a plurality of the nozzles are arranged in each direction from the center of the rotating nozzle head, and the distances from the center to each of the nozzles are different; The asbestos removal system of claim 3.

5. an exhaust port for reducing the pressure of the first high-pressure air; Further provided with 10. The asbestos removal system of claim 1.

6. The pressure of the mist sprayed from the nozzle is 100 to 300 MPa.

10. The asbestos removal system of claim 1.

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