JP2016172295A - Removal method of harmful substance-containing coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove an undercoating conditioner and an elastic coating material at a front side which are coated on the surface of a construction and where at least one contains a harmful substance without scattering the harmful substance.SOLUTION: A suction type grinder 20 and a blast device having a nozzle head are used when removing an undercoating conditioner 3a coated on a wall surface 2 and an elastic coating material 3b at a front side. First, the grinding portion exposed from the case opening of the elastic coating material 3b is ground while sucking the inside of the case of the suction type grinder 20 via a suction hose 80a sucked by a vacuum device 50. Next, an abrasive is sprayed from the nozzle head of the blast device to the undercoating conditioner 3a exposed after grinding and the undercoating conditioner 3a is peeled and removed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a substrate conditioner containing a harmful substance (asbestos, heavy metal, PCB, etc.) applied to a surface such as a wall surface of a structure and a method for removing a harmful substance-containing coating material that removes an elastic coating material on the surface side. .

  If an elastic coating material is applied directly to a concrete surface such as a wall surface of a building, the concrete surface may be too rough and difficult to paint. Therefore, in order to make it easy to paint, first, a surface conditioner was applied to the concrete surface to smooth the surface, and an elastic coating material was applied thereon. The base conditioner is an inelastic agent that does not have elasticity.

  The elastic coating material often contains harmful substances such as asbestos (asbestos), and the base preparation agent may contain harmful substances. Hereinafter, it is assumed that at least one of the base conditioner and the elastic coating material contains a harmful substance.

  Asbestos is excellent in incombustibility, fire resistance, heat insulation and sound absorption, so in the past, on the exterior walls and exterior floors of buildings, ceilings of buildings, walls, floors, pillars and beams, etc. It has been used by spraying it as a heat insulating material or a sound absorbing material, or by coating it with a paint or a base conditioner. However, in recent years, it has been pointed out that asbestos is harmful and adversely affects the health of the human body, and it is safely removed to the human body when removing the base conditioner and elastic coating material containing asbestos. Regulations to strengthen are strengthened.

  In addition to the asbestos, the harmful substances contained in the substrate conditioner and the elastic coating material include heavy metals such as lead and PCB (polychlorinated biphenyl).

  When removing surface conditioners and elastic coating materials containing harmful substances such as walls, disc grinders (also simply called grinders) that people use and grinding (or peeling) by spraying abrasives By using the blasting apparatus, the surface conditioner such as the wall surface and the elastic coating material are ground and removed.

  By the way, there is a case where a coating material that does not contain harmful substances is applied to the surface after removing the base conditioner and the elastic coating material. In this case, the surface finish after removal is required to be good. Here, the finish of the surface is grade 2 in the grinder process, but is grade 1 in the blast process. The first grade is better than the second grade.

  For this reason, when the surface after removal, such as repainting on a coating material that does not contain harmful substances, is reused, it is preferable to remove the base conditioner and the elastic coating material by blasting. As a technique for performing this type of blasting process, there is an apparatus described in Patent Document 1.

JP 2003-1563 A

  As described above, when the treatment for removing the base conditioner and the elastic coating material painted on the surface of the building is performed by blasting, there is an elastic coating material on the surface to be removed first. In this case, when the blast treatment is performed, the impact of the abrasive sprayed on the surface is absorbed by the elasticity of the elastic coating material. For this reason, there was a problem that it was difficult to remove the coating material.

  The present invention has been made in view of such circumstances, and is applied to the surface of a base material containing at least one toxic substance and an elastic coating material on the surface side applied to the surface of a building. An object of the present invention is to provide a method for removing a harmful substance-containing coating material that can be easily removed without splashing.

  As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that at least one of the base conditioner and the elastic coating material containing a harmful substance is used, and the base conditioner and the surface applied to the surface. A method for removing a harmful substance-containing coating material that removes the elastic coating material on the side, wherein the ground surface is exposed from the opening of the case while sucking the inside of the case with the tip of a suction hose sucked by a vacuum device Thus, using the suction grinder that grinds the coating material by the grinding part housed in the case, the suction side of the case is sucked into the elastic coating material while sucking the inside of the case with the tip of the suction hose. The first step of pressing and grinding and removing the elastic coating material in the grinding part is performed, and the abrasive is sprayed onto the coating material coated on the surface, and is peeled off by the sprayed abrasive material. Using a blasting device having a nozzle head for collecting coating material dust collected by suction with a suction hose, and pressing the nozzle head against the ground conditioner exposed after removal in the first step, This is a method for removing a toxic substance-containing coating material, wherein a second step of peeling and removing the base conditioner by spraying the base conditioner on the base conditioner is performed.

  According to this method, first, the elastic coating material on the surface side is removed using a suction grinder. In this case, although the coating material has elasticity, since the elastic coating material is ground by a hard grinding part such as a grinding wheel, the elastic coating material can be easily ground and removed. Next, using a blasting apparatus, the ground conditioner exposed after the removal of the elastic coating material is removed. In this case, since the base conditioner does not have elasticity, the base conditioner can be easily peeled and removed by spraying the abrasive from the nozzle head. Accordingly, it is possible to easily remove the base conditioner coated on the surface and the elastic coating material on the surface side.

  According to the present invention, it is possible to easily remove the base conditioner and the elastic coating material on the surface side, which are applied to the surface of the building and contain at least one harmful substance, without scattering harmful substances. it can.

It is sectional drawing which shows the structure of the grinder processing system for implement | achieving the removal method of the harmful substance containing coating material which concerns on embodiment of this invention. It is sectional drawing which shows the structure of a suction type grinder. It is sectional drawing which shows the structure of the blast processing system for implement | achieving the removal method of the harmful substance containing coating material which concerns on embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of Embodiment>
In the present invention, when removing the surface conditioner and the surface-side elastic coating material coated on the surface of the building, the surface-side elastic coating material is removed by grinding with a grinder process, The conditioner was removed by grinding by blasting. However, it is assumed that at least one of the base conditioner and the elastic coating material contains a harmful substance.

FIG. 1 is a cross-sectional view showing a configuration of a grinder processing system for realizing a method for removing a harmful substance-containing coating material according to an embodiment of the present invention.
In FIG. 1, a base surface adjusting agent 3 a that does not have elasticity and an elastic coating material 3 b on the surface side are applied to the wall surface 2 of the exterior 1 of the building. Regardless of the wall surface 2, the base preparation agent 3 a and the elastic coating material 3 b may be coated on an exposed surface such as the floor 5 provided on the exterior 1 in contact with the wall surface 2. Furthermore, it may be painted on the wall surfaces, floors and ceilings of buildings, and exposed surfaces such as columns. However, in the present embodiment, a case where the external wall 1 is painted will be described as an example. Moreover, in this embodiment, although the harmful substance contained in at least one of the base preparation agent 3a and the elastic coating material 3b is asbestos in this example, in addition to asbestos, the aforementioned heavy metals such as lead, PCB, etc. is there.

  The grinder processing system 10 shown in FIG. 1 removes the surface-side elastic coating material 3b painted on the wall surface 2. The grinder processing system 10 includes a suction-type grinder 20 used by an operator 4, a bug receiver tank 30, a HEPA filter (High Efficiency Particulate Air Filter) device 40, a vacuum device 50, and a power supply for the vacuum device 50. 60 and a storage chamber 70.

  The bug receiver tank 30 and the HEPA filter device 40 are arranged on the floor 5 of the outside 1, and are further stored in the storage chamber 70 in an airtight state (or a sealed state) on the floor 5. A vacuum device 50 and a power source 60 are also arranged on the floor 5.

  The suction grinder 20 and the bag receiver tank 30 are connected by a suction hose 80a, the HEPA filter device 40 and the bag receiver tank 30 are connected by a suction hose 80b, and the HEPA filter device 40 and the vacuum device 50 are connected by a suction hose 80c. Has been. With this connection, air containing dust and the like is sucked from the opening of the suction hose 80a by the suction force of the vacuum device 50.

  As shown in FIG. 2, the suction grinder 20 includes a main body 21 in which a motor (not shown) is incorporated, and a disk having a central portion connected to the tip of a motor shaft 22 protruding from the main body 21. A grinder portion 24 having a cylindrical grinding portion 23 and a bowl-like (concave) case 25 are combined. This combination structure will be described. The grinder portion 24 and the case 25 are fixed by inserting the outer peripheral surface on the distal end side of the main body portion 21 through a through hole formed in the center portion of the case 25. Further, the grinder portion 24 and the case 25 are combined in a state where the grinding surface 23 a of the grinding portion 23 connected to the tip of the shaft 22 protruding from the inserted main body portion 21 is exposed from the opening 25 a of the case 25. ing. The grinding part 23 is rotated by the rotational force of the motor. The grinding part 23 is formed in a disk shape or the like from a hard material having many irregularities on the surface of a grinding wheel or the like.

  Further, a brush 26 is fixed to a peripheral end around the opening 25a of the case 25 in a state of protruding a predetermined length. A through hole 25c that passes through the wall of the outer surface 25b and communicates with the inside and a tip opening (one end) of the suction hose 80a are joined to the outer surface 25b of the case 25 in a communicating state. The case 25 is made of a material that is not easily damaged, such as a metal material or a reinforced resin material. The suction hoses 80a to 80c (see FIG. 1) are made of a flexible material. In place of the brush 26, a porous flexible material such as a sponge that allows air to pass but does not allow elastic coating material dust to pass through may be used. The elastic coating material dust is dust containing powder of the elastic coating material 3b that is separated when the elastic coating material 3b is ground by the suction grinder 20. Hereinafter, the elastic coating material dust is also referred to as first dust.

  The suction-type grinder 20 having such a configuration performs grinding as follows. That is, the operator 4 grips the main body 21 and activates the motor, and presses the brush 26 of the case 25 that accommodates the grinding unit 23 that rotates by this activation against the elastic coating material 3 b of the wall surface 2. Further, the operator 4 crushes and deforms the brush 26 and presses the grinding part 23 against the elastic coating material 3b, whereby the grinding surface 23a grinds and removes the elastic coating material 3b. At the same time, the removed first dust is sucked from the tip opening of the suction hose 80a by suction of the vacuum device 50 shown in FIG. 1, and passes through the suction hoses 80a, 80b, 80c, and the bag receiver tank 30 and the HEPA. It is collected by the filter device 40. At this time, since the space between the case 25 and the wall surface 2 is closed by the brush 26, air enters the case 25 from the outside of the case 25 through the brush 26. This air flow makes it easy for the first dust to be sucked into the suction hose 80 a, and the first dust does not go out of the case 25.

  The bag receiver tank 30 has a bag filter (not shown) for collecting dust mounted therein. The bag filter collects dust by letting air containing first dust pass through a filter cloth (not shown), and collects the first dust collected by hitting air from the back side of the filter cloth (not shown). )). When the dust bag is filled with the first dust, the suction by the vacuum device 50 is stopped, the mouth of the dust bag is closed, the bag is pulled out from the receiver tank, and replaced with a new dust bag. In some cases, replacing the dust bag is replacing the bag filter.

  The fact that the dust bag of the bag filter is full is notified to the worker 4 or other workers by an alarm device such as a buzzer and a lamp (not shown) attached to the bag receiver tank 30. In addition, even if the bag receiver tank 30 and the suction grinder 20 are electrically connected and have an interlock function that automatically stops the suction grinder 20 when the dust bag is full. Good.

  The HEPA filter device 40 incorporates a HEPA filter (not shown) in a detachable manner. The HEPA filter is a filter having a dust collection rate of 99.97% or more when smoking is allowed to pass through the filter once using cigarette smoke (0.3 μm particles) as test dust according to JIS standards. In this HEPA filter, the fine first dust contained in the air discharged through the suction hose 80 b without being collected by the bag receiver tank 30 can be captured almost completely. For this reason, the 1st dust contained in the exhaust_gas | exhaustion of the HEPA filter apparatus 40 becomes almost none.

  Note that the air that flows into the HEPA filter device 40 via the suction hose 80b is air from which most of the first dust has already been removed by passing through the bag receiver tank 30 in the preceding stage. For this reason, an excessive burden is not applied to the HEPA filter device 40, and the lifetime is significantly increased.

When the HEPA filter is filled with the collected first dust and cannot be collected, an alarm device such as a buzzer and a lamp (not shown) attached to the HEPA filter device 40 or other work is performed. To inform the person. It is assumed that the state where it cannot be collected includes clogging. In addition, even if the HEPA filter device 40 and the suction grinder 20 are electrically connected and have an interlock function that automatically stops the suction grinder 20 when the dust bag is full. Good.
Hereinafter, the exchange of the bag filter dust bag and the HEPA filter is also referred to as filter exchange.

  The vacuum device 50 performs a suction operation by supplying power from a power source 60, and includes a roots blower (positive displacement blower) (not shown), an electric motor, and an exhaust silencer connected to an exhaust pipe of the roots blower in a casing. Configured.

  The roots blower is actuated by driving the electric motor, and a suction force is generated at the suction port via the intake pipe of the roots blower. The generated suction force passes through the suction hoses 80c and 80b and is transmitted to the suction hose 80a through the HEPA filter device 40 and the bag receiver tank 30, and sucks the first dust from the opening of the tip end of the suction hose 80a. ing. At this time, the exhaust sound of the Roots blower is reduced by the exhaust silencer.

  In addition, since suction with a Roots blower has a high vacuum pressure, suction of the first dust can be performed efficiently, and long-distance suction is possible. For this reason, for example, when the grinding object is in a closed space such as a room, the vacuum device 50 can be installed outside the closed space.

  The storage chamber 70 encloses the bag receiver tank 30 and the HEPA filter device 40 in a sealed manner. This is because when the dust collection bag of the bag receiver tank 30 is filled with the first dust, it is replaced with a new dust collection bag, or the HEPA filter of the HEPA filter device 40 cannot collect the first dust. This is to prevent the first dust from being scattered in the space of the outside 1 when the state is reached. The sealed state is a state that can be regarded as almost sealed even if it is not completely sealed. This concept is the same for the airtight state.

  The storage chamber 70 includes a skeleton (not shown) having a rectangular parallelepiped structure in which a plurality of straight pipes (not shown) made of resin, lightweight metal, or the like are connected in the vertical and horizontal directions by pipe joints, and the skeleton. It is comprised with the sheet | seat (not shown) which covers 6 surfaces. The sheet is made of resin such as vinyl, polyethylene, or polypropylene. In addition, a line fastener (not shown) is attached to a sheet on the side of the storage chamber in an L-shaped slit as an entrance through which a person can enter and exit so that the person can open and close the line fastener. It has become.

  The bag receiver tank 30 and the suction hoses 80a and 80c of the HEPA filter device 40 stored in the storage chamber 70 are inserted through through-holes (not shown) formed on the opposing side surfaces of the storage chamber 70, respectively. 70 to the outside.

  Next, the blast processing system will be described. FIG. 3 is a cross-sectional view showing a configuration of a blast treatment system for realizing the method for removing a harmful substance-containing coating material according to an embodiment of the present invention.

  3 includes a nozzle head 120, a recovery / separation tank 130, a pressurization tank 131, a dust collector 132, a blower 133, and an operation panel 135, and further contains a blast processing system (blasting apparatus) 100. The chamber 70, the vacuum device 50, and the power source 60 are configured to be shared with the grinder processing system 10.

  The nozzle head 120 sprays the grinding material 111 onto the ground conditioning agent 3a as an object to be removed, and collects coating dust containing the powder of the ground conditioning material 3a peeled off by the grinding material 111. As the abrasive 111, alumina (aluminum oxide), ceramic powder such as silicon carbide, glass beads, plastic powder, or the like is used. In addition, it is assumed that the base conditioner 3a is exposed after the elastic coating material 3b is removed by the grinder processing system 10 described above. In addition, coating dust is also called 2nd dust.

The nozzle head 120 includes a nozzle 122 for spraying the abrasive 111 onto the base conditioner 3a in a bowl-shaped (concave) case 121, and a recovery port 123 for recovering the second dust separated by the spraying. It has. A brush 124 is fixed to a peripheral end around the opening 121a of the bowl-shaped case 121 so as to protrude a predetermined length.
The nozzle 122 is inserted into a through-hole provided in the center of the case 121 and extends into the internal space of the case 121 so that the abrasive 11 is sprayed to the center of the region surrounded by the brush 124. . A front end opening of a blast hose 126 for feeding the abrasive 111 is connected and fixed to the open end of the nozzle 122 protruding to the outer surface side of the case 121 in a communicating state.

  The recovery port 123 is formed so as to penetrate the wall near the nozzle insertion of the case 121 and communicate with the inside of the case. A tip end opening of the suction hose 125 is connected and fixed to the recovery port 123 in a communicating state on the outer surface side of the case 121.

  Air, dust, and the like in the case 121 are sucked by the suction hose 125 through the recovery port 123, and this is performed as follows. That is, the other end of the suction hose 125 communicating with the recovery port 123 communicates with the dust hose 127 via the recovery separation tank 130, and the dust hose 127 communicates with the suction hose 128 via the dust collector 132. 128 is connected to the vacuum device 50. Therefore, suction is performed in the order of the dust collector 132, the dust hose 127, the recovery separation tank 130, and the suction hose 125 by performing suction with the vacuum device 50 through the suction hose 128. It is designed to suck the air inside.

  The nozzle head 120 having the above configuration peels and removes the base conditioner 3a as follows. That is, the operator 4 (see FIG. 1) grips the case 121 and presses the brush 124 against the base material adjusting agent 3a on the wall surface 2 and further presses the brush onto the base material adjusting agent 3a until the brush 26 is deformed. In this state, the abrasive 111 is ejected from the nozzle 122, and the base conditioner 3a is ground and peeled off. The separated second dust is sucked together with the abrasive 111 from the recovery port 123 by the suction hose 125. At this time, since the space between the case 121 and the wall surface 2 is blocked by the brush 124, air enters the case 121 from the outside of the case 121 through the brush 124. The second dust is easily sucked by the suction hose 125 by this air flow, and the second dust and the abrasive 111 do not come out of the case 121. Instead of the brush 124, a porous flexible material such as sponge that allows air to pass but not second dust may be used.

  The recovery / separation tank 130 is connected to the inside of the suction end of the suction hose 125 in a communicating state, and sucks the mixture of the second dust and the abrasive 111 separated from the wall surface 2 through the suction hose 125. to recover. Further, the recovery / separation tank 130 separates the recovered mixture into the abrasive 111 and the second dust. One of the separated abrasives 111 is sent to a pressurized tank 131 disposed below the recovery / separation tank 130, and the other second dust is sent to the dust collector 32 via the dust hose 127. It has become.

  The pressurized tank 131 applies air pressure to the abrasive 111 sent from the recovery / separation tank 130 and feeds it to the nozzle 122 of the nozzle head 120 via the blast hose 126. By this pressure feeding, the abrasive 111 is ejected from the nozzle 122. As described above, the abrasive 111 passes through the nozzle head 120, the suction hose 125, the recovery / separation tank 130, the pressurization tank 131, and the blast hose 126 in order, and circulates in the path ejected from the nozzle head 120.

  The lengths of the suction hose 125 and the blast hose 126 are determined according to the area of the wall surface 2 from which the base conditioner 3a is removed. The hose length is increased as the area increases. The suction hose 125 and the blast hose 126 are made of a flexible material, and the operator 4 (see FIG. 1) can move the nozzle head 120 freely.

  The dust collector 132 sucks the second dust separated in the collection / separation tank 130 through the dust hose 127 and collects the second dust in a dust collection bag (not shown) disposed inside. At this time, the air inside the dust collector 132 is discharged from the chimney-shaped cylinder by the blower 33 provided in communication with the dust collector 132. The blower 33 is provided with a HEPA filter 134 to prevent leakage of dust to the outside air. It is assumed that the HEPA filter 134 has a filter function equivalent to that of the HEPA filter of the HEPA filter device 40 described above.

  The operation of the blast processing system 100 described above is performed by an operator operating the operation panel 135. The operation panel 135 is wired so that power can be supplied from the power source 60.

  The storage chamber 70 hermetically surrounds the recovery / separation tank 130, the pressurized tank 131, the dust collector 132, the blower 133, and the operation panel 135. However, only the operation part of the operation panel 135 can be operated from the side surface of the storage chamber 70. Alternatively, only the operation panel 135 may be disposed outside the storage chamber 70.

  When the dust collection bag of the dust collector 132 is filled with the second dust, the storage chamber 70 is replaced with a new dust collection bag, or the HEPA filter 134 of the blower 133 cannot collect the second dust. This is to prevent the second dust from being scattered in the space of the outside 1 when the state is replaced.

  In the present embodiment, the collection chamber 70 of the blast treatment system 100, the pressure tank 131, the dust collector 132, the blower 133, and the operation panel 135 are disposed inside the storage chamber 70. Assume that the bag receiver tank 30 and the HEPA filter device 40 of the grinder processing system 10 are also arranged. Alternatively, two storage chambers 70 may be prepared, one for the blast processing system 100 and the other for the grinder processing system 10.

  When the dust collection bag of the dust collector 132 is full, or when the HEPA filter 134 is filled with the collected second dust and becomes unable to be collected, an unillustrated attached to the dust collector 132 is not shown. An alarm device such as a buzzer and a lamp notifies the worker 4 or other workers. In addition, when the dust collector 132 and the nozzle head 120 are electrically connected and the dust bag is full, or when the HEPA filter 134 is unable to collect, the dust from the nozzle 122 An interlock function that automatically stops the ejection of the abrasive 111 may be provided.

<Operation of Embodiment>
Next, the above-described grinder processing system 10 and blast processing system 100 remove the base material adjusting agent 3a and the elastic coating material 3b on the surface side, which are painted on the wall surface 2 shown in FIG. The procedure of the method will be described.

  However, as described above, inside the storage chamber 70, the recovery separation tank 130, the pressure tank 131, the dust collector 132, the blower 133, and the operation panel 135 of the blast processing system 100 shown in FIG. In addition to the arrangement, it is assumed that the bag receiver tank 30 and the HEPA filter device 40 of the grinder processing system 10 shown in FIG. 1 are also arranged.

  First, as shown in FIG. 1, the worker (which may be either the worker 4 performing grinding or another worker) turns on the power supply 60 and starts the vacuum device 50. Thus, suction is started from the opening of the suction hose 80a attached to the suction grinder 20 by the suction force of the vacuum device 50.

  Next, the operator 4 has the main body 21 of the suction grinder 20 in front of the wall surface 2 and starts the motor. 2 rotates, so that the operator 4 presses the brush 26 of the case 25 against the elastic coating material 3b of the wall surface 2, and further, the brush 26 is crushed and deformed. The grinding part 23 is pressed against the elastic coating material 3b. As a result, the grinding surface 23a starts to grind the elastic coating material 3b.

  The first dust removed by the grinding is sucked from the tip opening of the suction hose 80a. The sucked first dust first flows into the bag receiver tank 30 through the suction hose 80a. The inflowing first dust is collected by a bag filter in the bag receiver tank 30.

  At this time, the fine first dust that has passed through the bag filter flows into the HEPA filter device 40 through the suction hose 80b. The fine first dust that flows in is captured almost completely by the HEPA filter device 40. For this reason, the 1st dust contained in the exhaust_gas | exhaustion to the suction hose 80c of the HEPA filter apparatus 40 becomes substantially no. Therefore, the component that flows into the vacuum device 50 through the suction hose 80c is substantially only air.

  While the grinding of the coating material 3 is being carried out, if the dust collection bag becomes full in the bug receiver tank 30, the fullness is reported to the operator by an alarm or the like. Stops grinding the coating material 3 and replaces the dust bag. This replacement may be performed by another worker.

  When exchanging the dust bag, the operator opens the L-shaped wire fastener (not shown) of the storage chamber 70 and enters the storage chamber 70, and closes the line fastener in a sealed space. The replaced dust collection bag is taken out of the storage chamber 70 by an operator and stored in a predetermined place.

  On the other hand, even when the HEPA filter of the HEPA filter device 40 is unable to collect the first dust while the coating material 3 is being ground, the storage chamber is similar to the replacement of the dust bag. At 70, the operator replaces the HEPA filter of the HEPA filter device 40 and stores it in a predetermined location.

  After performing such filter replacement, the operator 4 resumes the removal work of the coating material 3. This removal operation is performed until the elastic coating material 3b is completely removed from the wall surface 2. When all of the elastic coating material 3b is removed, all of the base material adjusting agent 3a on the wall surface 2 is now exposed.

Next, a process for removing the base conditioner 3a by the blast processing system 100 will be described with reference to FIG.
The worker 4 (see FIG. 1) makes the nozzle head 120 abut on the base material adjustment agent 3a on the wall surface 2. Thereafter, another operator turns on the power supply 60 shown in FIG. 3 to activate the vacuum device 50 and operates the operation panel 135 to eject the abrasive 111 from the nozzle 122 of the nozzle head 120.

  The ground grinding agent 111 ejected collides with the base material adjusting agent 3 a, whereby the base material adjusting agent 3 a is peeled off from the wall surface 2. At this time, the base preparation agent 3 a is peeled off as the second dust and scattered in the case 121. At the same time, the abrasive 111 that collides with the wall surface 2 is scattered in the case 121. In this case, the inside of the case 121 is sucked by the suction hose 125 through the recovery port 123, and the space between the case 121 and the wall surface 2 is closed by the brush 124. For this reason, since air enters the case 121 from the outside of the case 121 via the brush 124, the air flows from the brush 124 to the recovery port 123. Due to this air flow, the scattered second dust and the abrasive 111 become a mixture and are sucked into the recovery port 123 together with the air.

  The sucked mixture is sucked into the recovery / separation tank 130 via the suction hose 125. In the collection / separation tank 130, the sucked mixture is separated into the abrasive 111 and the second dust. The separated one abrasive 111 is sent to the pressurized tank 131, and the other second dust is sent to the dust collector 32 through the dust hose 127.

  In the pressurized tank 131, air pressure is applied to the abrasive 111 sent through the dust hose 127. With this air pressure, the abrasive 111 is pumped to the nozzle 122 of the nozzle head 120 via the blast hose 126, and is again ejected from the nozzle 122 to the base conditioner 3a. Thereafter, the abrasive 111 passes through the nozzle head 120, the recovery port 123, the suction hose 125, the recovery separation tank 130, the pressurization tank 131, and the blast hose 126 in order until the blasting operation is stopped. Cycle in order of return.

  On the other hand, the second dust separated in the collection / separation tank 130 is sucked into the dust collector 132 via the dust hose 127 and collected in the dust collection bag. At this time, the air inside the dust collector 132 is discharged from the chimney-shaped tube by the blower 33. Such a process is performed until all the base material adjustment agents 3a are removed from the wall surface 2.

<Effect of embodiment>
As described above, the method for removing a harmful substance-containing coating material according to the present embodiment uses the base conditioner 3a and the elastic coating material 3b containing a harmful substance in at least one of them, and the wall surface 2 as a surface. The undercoat conditioner 3a and the elastic coating material 3b on the surface side are removed.

  The feature of the method for removing a harmful substance-containing coating material according to the present embodiment is that a grinder processing system including a suction grinder 20 when removing the base conditioner 3a coated on the wall surface 2 and the elastic coating material 3b on the surface side. 10 and a blast processing system 100 as a blasting apparatus having a nozzle head 120.

  The suction grinder 20 is a grinding part accommodated in the case 25 so that the grinding surface 23a is exposed from the opening 25a of the case 25 while sucking the inside of the case 25 with the tip of the suction hose 80a sucked by the vacuum device 50. 23, the coating material is ground.

  The nozzle head 120 sprays the abrasive 111 onto the coating material coated on the surface, and collects the dust of the coating material peeled off by the sprayed abrasive 111.

  First, the operator 4 uses the suction type grinder 20 and presses the opening 25a side of the case 25 against the elastic coating material 3b while sucking the inside of the case 25 with the tip of the suction hose 80a. A first step of grinding and removing the system coating material 3b is executed.

  Next, the operator 4 uses a blasting device, presses the nozzle head 120 against the ground surface adjustment agent 3a exposed after the removal in the first step, and sprays the abrasive 111 onto the ground surface adjustment agent 3a, thereby The 2nd step which peels and removes the adjustment agent 3a is performed.

  According to this method, first, the elastic coating material 3b on the surface side is removed using the suction grinder 20. In this case, the coating material 3b has elasticity, but since the elastic coating material 3b is ground by the hard grinding part 23 such as a grinding wheel, the elastic coating material 3b can be easily ground and removed. .

  Next, by using the blast processing system 100, the base adjustment agent 3a exposed after the removal of the elastic coating material 3b is removed. In this case, since the base preparation agent 3a does not have elasticity, the base preparation agent 3a can be easily peeled and removed by spraying the abrasive 111 from the nozzle head 120.

  Accordingly, it is possible to easily remove the base conditioner 3a coated on the surface and the elastic coating material 3b on the surface side. Further, the surface conditioner 3a painted on the wall surface 2 is removed by a blasting process with a first-class surface finish. For this reason, the surface of the wall surface 2 after paint removal can be made into a favorable finish rather than the 2nd grade grinder process whose finish is worse than the 1st grade. Thereby, the surface of the wall surface 2 after removal, such as removing the harmful substance-containing coating material from the wall surface 2 and re-coating it on the coating material not containing the harmful substance, can be reused appropriately.

  In addition, since harmful substances contained in the base preparation agent 3a and the elastic coating material 3b are removed while being sucked, it is possible to prevent the space around the work of the outside 1 and the work space such as the room from being contaminated. . For this reason, if the work place is indoors, it is not necessary to provide a clean room for performing air cleaning on the outside of the room as the work space as in the prior art, and the cost can be reduced correspondingly. Further, since a clean room is not required, an operator can easily move between the room and the outside, thereby eliminating the need to separately arrange an operator such as a vacuum device outside the room. Therefore, the number of workers can be reduced.

  Furthermore, in the grinder processing system 10 and the blast processing system 100, since the vacuum device 50, the power source 60, and the storage chamber 70 can be shared, the cost of work equipment can be reduced accordingly.

<Modification of Embodiment>
In addition, it is good also as following structures as a modification. The nozzle 122 can be inserted into and removed from the through hole in the central portion of the nozzle head 120 shown in FIG. Further, the main body 21 of the grinder 24 shown in FIG. 2 can be inserted into and removed from the through hole of the nozzle head 120 after the nozzle 122 is pulled out. Furthermore, a partition mechanism (not shown) is provided at the boundary between the recovery / separation tank 130 and the pressurization tank 131 to separate both tanks 130 and 131 in an independent state or a communication state.

  A first screw thread is formed on the inner periphery of the through hole of the nozzle head 120, and a second screw threadedly engaged with the first screw thread is formed on the outer periphery of the nozzle 122 and the outer periphery of the main body portion 21 of the grinder portion 24. A thread may be formed. In the case of this configuration, the nozzle 122 or the main body portion 21 is screwed into the nozzle head 120 with the first and second threads, so that both can be firmly and closely fixed.

  The partition mechanism inserts a partition plate at the boundary between the recovery separation tank 130 and the pressurization tank 131 communicating with each other in the upper and lower directions, separates the tanks 130 and 131 in the upper and lower states, extracts the partition plate, The mechanism which makes the tanks 130 and 131 communicate with each other up and down may be used.

  In such a configuration, first, the main body portion 21 is inserted into the through hole of the nozzle head 120 to fix the grinder portion 24. This is equivalent to the suction grinder 20 shown in FIG. Further, the separation / separation tank 130 and the pressurized tank 131 are made independent from each other by the partition mechanism. Thereafter, the elastic coating material 3 b on the wall surface 2 is ground and removed by the grinding portion 23 of the grinder portion 24 while suction is performed by the vacuum device 50.

  The removed first dust is sucked from the collection port 123 of the nozzle head 120 through the suction hose 125 and collected in the collection / separation tank 130. At this time, the recovery / separation tank 130 is separated from the pressurization tank 131 by the partition mechanism and is independent. Therefore, the recovered first dust is not sent to the pressurization tank 131, and all the first dust is collected as dust. It is sent to the dust collector 132 via the hose 127 and collected in the dust bag. This grinder processing is performed until all the elastic coating material 3b is removed from the wall surface 2.

  Next, when the main body portion 21 is removed from the through hole of the nozzle head 120 and the nozzle 122 is inserted into the through hole, the nozzle head 120 has the nozzle 122 as shown in FIG. At this time, if the recovery / separation tank 130 and the pressurized tank 131 are brought into a communication state by releasing the partition mechanism, as described above, the base conditioner 3a can be removed by blasting.

  As described above, a system in which the blast processing system 100 is combined with the grinder unit 24 has a simplified configuration as compared with a system that uses both the grinder processing system 10 and the blast processing system 100. With this simplified system, there is an advantage that the base conditioning agent 3a and the elastic coating material 3b on the surface side can be easily removed from the wall surface 2.

  In some cases, a non-elastic coating material (not shown) that contains or does not contain harmful substances may be applied on the base conditioner 3a instead of the elastic coating material 3b. In this case, it is possible to remove the non-elastic coating material using either the grinder processing system 10 or the blast processing system 100, and then remove the base conditioner 3a by the blast processing system 100.

DESCRIPTION OF SYMBOLS 10 Grinder processing system 20 Suction type grinder 21 Main body part 23 Grinding part 24 Grinder part 30 Bag receiver tank 40 HEPA filter device 50 Vacuum device 60 Power supply 70 Storage chamber 80a-80c Suction hose 100 Blast processing system 111 Grinding material 120 Nozzle head 121 Case 122 Nozzle 123 Recovery port 125, 128 Suction hose 126 Blast hose 127 Dust hose 130 Recovery separation tank 131 Pressure tank 132 Dust collector 133 Blower 134 HEPA filter 135 Operation panel

Claims (1)

A method for removing a harmful substance-containing coating material, wherein a ground conditioner and an elastic coating material containing a harmful substance in at least one are used, and the ground conditioner applied on the surface and the elastic coating material on the surface side are removed. Because
A suction grinder that grinds the coating material with a grinding part housed in the case so that the grinding surface is exposed from the opening of the case while sucking the inside of the case with the tip of the suction hose sucked by the vacuum device Use
While suctioning the inside of the case with the tip of the suction hose, the first step of pressing the opening side of the case against the elastic coating material and grinding and removing the elastic coating material at the grinding portion is executed. ,
Using a blasting device that has a nozzle head that sprays the abrasive onto the paint coated on the surface and collects the paint dust that is peeled off by the sprayed abrasive while sucking with a suction hose,
Second step of peeling off and removing the base conditioner by pressing the nozzle head against the base conditioner exposed after the removal in the first step and spraying the abrasive onto the base conditioner. This is a method for removing paint containing hazardous substances.

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