JP7519063B2 - Device and method for preventing scattering of coating materials containing harmful substances, and scaffolding for preventing scattering - Google Patents

Description

The present invention relates to a device for preventing scattering of coating materials containing harmful substances, a method for preventing scattering of coating materials containing harmful substances, and scaffolding for preventing scattering of coating materials containing harmful substances, and in particular to a device for preventing scattering of coating materials containing harmful substances, a method for preventing scattering of coating materials containing harmful substances, and scaffolding for preventing scattering of coating materials containing harmful substances, which prevent scattering of dust of the coating materials ground in a work area where a coating material containing harmful substances applied to a building is ground and peeled off with a peeling means.

Asbestos has traditionally been used as a building material. Commonly known as asbestos, it is a naturally occurring extremely fine mineral fiber that is durable, heat-resistant, chemical-resistant, and electrically insulating. From around 1960 to around 1990, it was used in large quantities for a variety of purposes, including as a construction material, friction material, sealing material, and insulation material.

However, when asbestos, an extremely fine mineral fiber, turns into dust and is inhaled through the airways, it can cause damage to the pleura and bronchi, and eventually lead to cancers such as lung cancer and mesothelioma, which can be considered carcinogenic. For this reason, the manufacture and use of asbestos is now completely prohibited.

Although the manufacture and use of asbestos is now completely prohibited, it was used in large quantities for many years in construction materials and other applications. For many years it was used in a wide variety of structures, from ordinary homes to public facilities such as schools. For this reason, construction materials containing asbestos remain in many existing buildings.

Asbestos, which has been widely used in construction materials, does not only turn into dust and scatter when exposed. For example, if a building collapses during a disaster such as an earthquake, there is a risk that large amounts of asbestos used in construction materials will be scattered. For this reason, measures are being taken to remove construction materials that contain asbestos.

Asbestos was used not only in construction materials, friction materials, sealing materials, and insulation materials, but also in finishing paint materials and base preparation paint materials. However, since the amount of asbestos added to these paint materials is small and they are fixed with cement or synthetic resin, it was thought that asbestos would not easily scatter.

For example, when demolishing a building that uses paint containing asbestos, there is a risk that asbestos will be dispersed if it is demolished in the same way as a building that does not contain asbestos.

In addition, it is extremely difficult to demolish a building without destroying the coating made from the paint material that contains asbestos. Furthermore, if an exterior wall is destroyed without knowing that it contains asbestos, there is a risk that asbestos will be dispersed.

There is a risk that paint containing asbestos may become airborne not only during the demolition of a structure, but also when repainting a structure that has used paint containing asbestos, there is also a risk that asbestos may become airborne if the paint is not removed properly.

Therefore, when demolishing a structure or removing interior and exterior materials from a structure, methods are used to prevent harmful substances such as asbestos dust from scattering outside the work area. For example, a method has been developed in which the work area where paint removal work is carried out is surrounded by an isolation sheet such as plastic, and the paint removal work is carried out in a negative pressure work area where the inside of the work area is maintained at a negative pressure (for example, Patent Document 1).

JP 2008-308914 A

In negative pressure work areas like the one above, the temperature inside rises, so a means is provided to cool the negative pressure work area, but there is a problem that depending on the cooling means, malfunctions may occur in machinery such as grinders used to polish the paint material.

Specific means for cooling the negative pressure work area include installing a cooling device to cool the negative pressure work area. However, if the negative pressure work area is cooled too much using a cooling device, it may cause malfunctions in the machinery used in the negative pressure work area.

More specifically, when a cooling device cools a negative pressure work area, the air in the negative pressure work area cools, reducing the amount of saturated water vapor, causing condensation, in which the moisture in the air turns into droplets. If this condensation occurs inside machinery used in the negative pressure work area, it can cause a short circuit in the electrical circuits. If the electrical circuits are shorted, problems can arise, such as the machinery no longer working or causing the machinery to break down.

Another method for cooling the negative pressure working area is to spray water into the negative pressure working area.
By spraying water into a negative pressure work area, the mist of water evaporates, and the heat of vaporization removes the temperature from the air, which is expected to have a cooling effect within the negative pressure work area.

However, this cooling method also sprays moisture into the air, and if the sprayed moisture gets inside the machinery used in the negative pressure work area, it may short-circuit the electrical circuits. If the electrical circuits short-circuit, problems may occur, such as the machinery no longer working or the machinery breaking down.

The present invention has been made in consideration of these points, and aims to provide a device for preventing the dispersion of harmful substances, a method for preventing the dispersion of harmful substances, and scaffolding for preventing the dispersion of harmful substances, which can prevent the dispersion of harmful substances that occurs during grinding work and improve the working environment without shorting out the machines used for the work.

In order to solve the above problems, the present invention provides a device for preventing scattering of coating materials containing harmful substances, which prevents scattering of dust particles from the coating material ground inside a work area where a coating material containing harmful substances applied to a building is ground and removed by a removing means, and is characterized in that the device includes a strip-shaped outlet from which compressed air supplied from a compressor is discharged in a strip along the wall surface of the building from above to below the side of the surrounding side of the work area, and a suction means for sucking in and purifying the air in the work area containing the dust moved by the compressed air discharged from the strip-shaped outlet.

As a result, compressed air is supplied from the compressor in a band along the side of the work area from the top to the bottom of the building, along the wall of the building, and is discharged from the band-shaped outlet, and the suction means sucks in and purifies the air in the work area, including the dust carried by the compressed air discharged from the band-shaped outlet.

The present invention also provides a method for preventing scattering of coating materials containing harmful substances, which prevents scattering of dust particles from the coating material ground inside a work area where a coating material containing harmful substances applied to a building is ground and removed by a removing means, the method comprising the steps of: supplying compressed air from a compressor in a band shape along the wall surface of the building from above to below the building on the periphery side of the work area, and discharging the compressed air from a band-shaped outlet; and using a suction means to suck in and purify the air in the work area containing the dust moved by the compressed air discharged from the band-shaped outlet.

As a result, compressed air is supplied from the compressor in a band along the side of the work area from the top to the bottom of the building, along the wall of the building, and is discharged from the band-shaped outlet, and the suction means sucks in and purifies the air in the work area, including the dust carried by the compressed air discharged from the band-shaped outlet.

The present invention also provides a scaffolding for preventing scattering of coating materials containing harmful substances, which prevents scattering of dust particles from the coating material ground inside a work area where a coating material containing harmful substances applied to a building is ground and removed by a removing means, and is characterized in that it comprises a strip-shaped outlet from which compressed air supplied from a compressor is discharged in a strip along the wall surface of the building from above to below the building on the periphery side of the work area, and a suction means for sucking in and purifying the air in the work area containing the dust moved by the compressed air discharged from the strip-shaped outlet.

As a result, compressed air is supplied from the compressor in a band along the wall of the building from the top to the bottom of the building surrounding the work area, and is discharged from the band-shaped outlet, and the suction means sucks in and purifies the air in the work area, including the dust carried by the compressed air discharged from the band-shaped outlet.

According to the device for preventing scattering of coating materials containing harmful substances, the method for preventing scattering of coating materials containing harmful substances, and the scaffolding for preventing scattering of coating materials containing harmful substances of the present invention, compressed air is supplied from a compressor in a band along the wall surface of the building from above to below the surrounding side of the work area, and is discharged from a band-shaped outlet, and the air in the work area containing dust moved by the compressed air discharged from the band-shaped outlet is sucked in and purified by a suction means, so that scattering of coating dust can be prevented without sealing with a protective sheet or the like. This suppresses the rise in temperature in the work area, improving the working environment in the work area.

In addition, because the temperature rise in the work area is suppressed, there is no need for a means to cool the work area. In other words, the cooling means will not generate moisture in the work area. As a result, electrical machinery such as the peeling means used in the work will not short out.

1 is a cross-sectional view showing a harmful substance dispersion prevention device according to an embodiment of the present invention. FIG. 13 is a front view showing an outlet installed on the scaffolding.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a harmful substance dispersion prevention device according to the present embodiment.
The harmful substance dispersion prevention device 100 of this embodiment prevents dust generated when a worker 400 grinds and removes a coating material 220 containing a harmful substance that has been applied to a wall surface 210 of a building 200, and the coating material 220 peels off the wall surface 210, from scattering into the surrounding area. An example of the harmful substance is asbestos.

As shown in FIG. 1, a scaffold 300, a temporary structure that is generally assembled to provide a foothold for people working at height during construction work, is assembled around the periphery of a building 200.

By standing on this scaffolding 300, a worker 400 can perform removal work by grinding away and removing the coating material 220 containing harmful substances that has been applied to the wall surface 210 at any height of the building structure 200. In this embodiment, the inside including the scaffolding 300 assembled on the periphery of the building structure 200 is referred to as the work area in the following explanation.

The harmful substance dispersion prevention device 100 includes a pump body 110, exhaust ports 120 installed at multiple desired positions on the scaffolding 300, a delivery pipe 130 connecting the pump body 110 and the exhaust ports 120, a suction device 140, and a protective sheet 150.

The pump body 110 is an air compressor that is installed on a stable location, such as the ground adjacent to the building 200, and compresses air. The pump body 110 is also connected to the exhaust port 120 via a delivery pipe 130, and delivers the compressed air to the exhaust port 120 via the delivery pipe 130 using power supplied by a power supply device (not shown).

The delivery pipe 130 connects the pump body 110 to the discharge outlet 120 installed at a desired position on the scaffolding 300, and is used to deliver the object pumped from the pump body 110 to the discharge outlet 120.

For example, the delivery pipe 130 may be a rigid delivery pipe made of metal or the like that is fixed to the scaffolding 300 in advance. When the scaffolding 300 is assembled, the delivery pipe 130 is also connected, and the tip of the delivery pipe 130 is connected to the discharge outlet 120 installed at the desired position on the scaffolding 300.

This rigid delivery pipe improves workability by forming the scaffolding 300 in the desired shape in advance so that the delivery pipe 130 can be connected when the scaffolding 300 is assembled, and the harmful substance dispersion prevention device 100 can be easily installed at the same time as the scaffolding is assembled.

The delivery pipe 130 may also be a flexible delivery pipe made of rubber, vinyl, or the like, in which case the delivery pipe 130 can be routed along any desired path to the assembled scaffolding 300. This allows the hazardous substance dispersion prevention device 100 to be easily incorporated into existing scaffolding 300.

The exhaust port 120 is for discharging the compressed air pumped from the pump body 110 through the delivery pipe 130, and is installed at a desired position of the scaffolding 300.
Specifically, the exhaust outlet 120 is installed on the outer peripheral surface of the installed scaffolding 300, i.e., on the outermost side of the work area, and is a band-shaped exhaust outlet that exhausts compressed air in a band-like shape parallel to the width direction of the wall surface 210, directed vertically downward along the wall surface 210 of the building structure 200.

In addition, multiple discharge outlets 120 can be installed at desired positions on the scaffolding 300, in which case the delivery pipe 130 can branch into multiple pipes at any position from the pump body 110 to the delivery pipe 130.

The compressed air discharged from the exhaust port 120 is discharged vertically downward along the outer peripheral surface of the scaffolding 300 along the wall surface 210 of the building structure 200 in a band shape parallel to the width direction of the wall surface 210. Therefore, the movement of the discharged compressed air also moves the dust of the coating material 220 peeled off from the wall surface 210 during the removal work vertically downward.

For example, when dust particles of the coating material 220 scattered within the work area attempt to move beyond the work area and out of the work area, the flow of compressed air discharged from the exhaust port 120 moves the dust particles of the coating material 220 vertically downward.

In this way, the dust of the coating material 220 falls vertically downward due to the band-shaped flow of compressed air discharged from the exhaust port 120, preventing the dust of the coating material 220 from scattering and spreading outside the work area.

The amount and speed of compressed air discharged from the exhaust outlet 120 can be set as desired. The amount and speed of compressed air discharged from the exhaust outlet 120, or the location of the exhaust outlet 120, is set so that the strip of compressed air discharged from one exhaust outlet 120 reaches the next exhaust outlet 120 installed below. This allows the strip of compressed air to be discharged from the exhaust outlet 120 continuously, preventing the dust of the coating material 220 from scattering and spreading outside the work area. The amount and speed of compressed air discharged from the exhaust outlet 120 has a sufficient wind volume and wind speed to cause the dust of the coating material 220 to fall vertically downward.

In addition, the exhaust port 120 can be not only a band-shaped exhaust port that exhausts compressed air in a band-shaped manner in the vertically downward direction as described above, but also a cool air exhaust port that exhausts compressed air as a cool breeze toward the worker 400.

The discharged cool air, which is compressed air, is directed toward the worker 400, replacing the warm air around the worker 400 with air at normal temperature. This allows the worker 400 to work comfortably.

The suction device 140 is for sucking in the compressed air discharged from the outlet 120 or dust of the coating material 220 that falls from above due to gravity.
Specifically, the suction device 140 is a vacuum device that collects dust from the coating material 220 using power supplied by a power supply unit not shown here and expels harmless air, and is installed in a stable location such as the ground adjacent to the building 200.

For example, the suction device 140 is equipped with a suction port, a filter, an electric motor, and an exhaust port. The suction port is for taking in outside air into the suction device 140. The filter is for purifying the air taken in by the suction device 140. The exhaust port is for expelling the air normalized by the filter, and has a silencer function. These internal devices are connected by an exhaust pipe. The suction port and exhaust port are separated into the inside and outside of the work area by a protective sheet 150, which will be described later.

As a specific example, in the suction device 140, the electric motor is driven to rotate the Roots blower, and the gas sucked into the inside of the device body through the suction port and exhaust pipe is discharged to the outside air through the exhaust port, generating suction force at the suction port.
This suction force makes it possible to suck in air containing dust particles of the coating material 220 that has fallen from above near the bottom adjacent to the wall surface 210 of the building structure 200.

The suction capacity of the suction device 140 varies depending on the number and size of the Roots blowers rotating inside the device body. In addition, suction by the Roots blowers can increase the vacuum pressure inside the device body. Therefore, dust from the coating material 220 can be sucked up efficiently.
In addition, because of its strong suction power, the suction ports of the suction device 140 can be connected and branched by a suction hose or the like, so as to suck up dust from the coating material 220 at a desired position on the scaffolding 300.

Also, a dust collecting device for collecting dust of the coating material 220 can be installed in advance on the suction side forward of the suction device 140 .
Furthermore, an air purifying device may be provided between the suction device 140 and the dust collector to further purify the air after the dust collector has collected the dust.

The dust collection device is a receiver tank with a removable dust collection filter, called a bag filter, that removes fine dust particles, soot, and fine harmful substances. The dust collection device is equipped with a dust collection filter, a dust collection tank body that houses the dust collection filter inside, and a dust collection bag that is installed inside the dust collection tank body to store the collected dust.

The dust collector is connected to the suction device 140 or air purifier at the rear by a suction hose or the like, and the suction device 140 uses its suction power to suck in air near the bottom adjacent to the wall surface 210 of the building 200, sucking in dust from the coating material 220, which is then collected by a dust collection filter.

The air purifier is a device that has a removable HEPA (High Efficiency Particulate Air Filter) filter built in to purify the air by removing dirt, dust, and other particles from the air, and is equipped with a HEPA filter and a device body that houses the HEPA filter inside.

The dust collector is connected to the front of the device and the suction device 140 to the rear by a suction hose or the like, and the suction force of the suction device 140 draws air near the bottom adjacent to the wall surface 210 of the building 200 into the dust collector, further purifying the air after it has been collected by the dust collector.

In this way, by installing a dust collector and air purifier in front of the suction device 140 on the suction side, the air that the suction device 140 exhausts to the outside air can be made cleaner. In addition, the burden on the suction device 140, which performs the suction operation, can be reduced.

The protective sheet 150 is intended to prevent dust from the coating material 220 from scattering outside the work area due to the compressed air discharged from the exhaust outlet 120 installed closest to the ground and reflected off the ground.

Specifically, protective sheet 150 is installed around the periphery of the lowest floor of scaffolding 300 so as to cover the underside of the work area.
A suction device 140 is inserted into an opening in a part of the protective sheet 151 so as to seal the opening, and the protective sheet 151 separates the work area from the outside air.

These protective sheets 150 can prevent dust from the coating material 220 that falls vertically downward due to the compressed air discharged from the exhaust port 120 from leaking out of the work area to the outside.

In addition, a protective sheet 152 is provided on the top of the scaffolding 300 as a protective sheet 150 to prevent moisture from entering the work area from the outside, and the protective sheet 152 is provided so as to cover the area between the structure 200 and the outer surface of the scaffolding 300.

By installing this protective sheet 152, rain that falls during rainy weather can be prevented from entering the work area. This allows removal work to be carried out efficiently even in rainy weather.

In addition, by installing the protective sheet 152, the compressed air discharged from the exhaust port 120 hits the worker 400 and is reflected, thereby preventing dust from the coating material 220 from leaking out of the work area to the outside.

Normally, the removal work, in which a worker 400 grinds and removes a coating material 220 containing harmful substances such as asbestos that has been applied to the wall surface 210 of the building 200, is carried out from the top of the building 200, and as the removal work is completed, the process proceeds toward the bottom of the building 200.

At this time, by placing a protective sheet 152 in front of the top part where work is carried out, it is possible to prevent rain from entering from the outside and dust from the coating material 220 from leaking out of the work area due to the compressed air discharged from the exhaust port 120.

Next, a procedure for removing the coating material 220 containing harmful substances by the worker 400 using the harmful substance dispersion prevention device 100 of this embodiment will be described.
First, a worker in charge of operating the machine (not shown) drives the pump body 110 and the suction device 140. This causes compressed air to be discharged through the exhaust port 120 within the work area, and the suction device 140 sucks up dust from the fallen coating material 220 and exhausts it outside the work area.

In this state, a worker 400 who is performing the work of removing the coating material 220 uses a removal device or the like to grind and remove the coating material 220. Dust from the coating material 220 generated by this work scatters around the worker 400.

The dust of the coating material 220 scattered around the worker 400 falls vertically downward due to the compressed air discharged from the exhaust port 120 .
The dust particles of the coating material 220 that have fallen vertically downward are eventually sucked into the suction device 140 by the suction force of the suction device 140, and the purified air is exhausted outside the work area. This makes it possible to prevent harmful substances that are generated during the grinding work from scattering.

As described above, the compressed air discharged from the exhaust port 120 causes the dust from the coating material 220 to fall vertically downward, so the dust from the coating material 220 does not scatter within the partitioned work area.

In addition, since the work area is not completely covered with protective sheet 150 or the like, the work environment is the same as the outside air. This prevents the temperature from rising in the work area. This allows the worker 400 to work in a comfortable environment. Furthermore, heatstroke and dehydration can be prevented.

In this embodiment, an example has been described in which the exhaust port 120 exhausts compressed air in a band parallel to the width direction of the wall surface 210, in a vertically downward direction along the wall surface 210 of the building structure 200. In addition, the compressed air can be exhausted not only in the vertically downward direction, but also with the leading end of the exhaust direction being exhausted toward the building structure 200 rather than in the vertically downward direction.

As a result, the compressed air discharged from the exhaust port 120 is discharged at an angle toward the wall surface 210 of the building 200, so that harmful substances generated during grinding work are not scattered beyond the work area.

The exhaust outlet 120 can also be provided on the top surface of the building 200 (not shown). The exhaust outlet 120 provided on the top surface of the building 200 is directed toward the ground and the compressed air is discharged so as to be diffused.

As a result, the exhaust outlet 120 on the top surface of the structure 200 discharges compressed air toward the ground, so that harmful substances generated during grinding work move toward the ground. In addition, the exhaust outlet 120 on the outer peripheral surface of the scaffolding 300 discharges compressed air, so that harmful substances do not scatter outside the work area.

FIG. 2 is a front view showing an exhaust outlet installed on the scaffold.
As shown in FIG. 2, the exhaust outlet 120 is installed at a desired location on the scaffolding 300 to exhaust a band of compressed air.

Specifically, the discharge outlet 120 may be fixed to the underside of the tread 310 of the upper floor of the assembled scaffolding 300, for example, so as not to interfere with the work of the worker 400.

The exhaust outlets 120 are installed at predetermined intervals on the scaffolding 300. The intervals at which the exhaust outlets 120 are installed may be adjusted according to the amount and speed of compressed air discharged from the exhaust outlets 120.

For example, if one exhaust outlet 120 is fixed to the underside of the step 310 on the upper floor, and the compressed air discharged from the exhaust outlet 120 can sufficiently reach the step 310 on the lower floor, the other exhaust outlet 120 is fixed to the underside of the step 310 on the lower floor.

As a result, the band of compressed air discharged from one exhaust outlet 120 is continuous with the band of compressed air discharged from the other exhaust outlet 120, preventing the dust of the coating material 220 from scattering and spreading outside the work area.

100 Harmful substance scattering prevention device 110 Pressure feeder body 120 Discharge port 130 Delivery pipe 140 Suction device 150, 151, 152 Curing sheet 200 Building 210 Wall surface 220 Painting material 300 Scaffolding 310 Stepboard 400 Worker

Claims (8)

An apparatus for preventing scattering of a coating material containing a harmful substance, the apparatus preventing scattering of dust of the coating material ground off within a work area in which a coating material containing a harmful substance that has been applied to a building is ground off by a stripping means, the apparatus comprising:
a strip-shaped discharge port that is disposed so as to surround the working area in the height, width, and depth directions of the building, and through which the strip-shaped compressed air supplied from the compressor is discharged from above the building downward;
a suction means for suctioning and purifying the air in the working area, including the dust moved by the compressed air discharged from the strip-shaped discharge port;
A device for preventing scattering of coating material containing harmful substances, comprising: The strip-shaped outlet is
Installed at predetermined intervals on scaffolding installed in the work area ;
2. The device for preventing scattering of a coating material containing harmful substances according to claim 1. The predetermined interval is
the interval at which the band of compressed air is placed in successive positions;
3. The device for preventing scattering of coating material containing harmful substances according to claim 2. The strip-shaped outlets installed at the predetermined intervals include
The band of compressed air is set at a continuous air volume and air speed;
3. The device for preventing scattering of coating material containing harmful substances according to claim 2. The leading end of the belt-shaped outlet in the discharge direction is
being directed toward the structure rather than vertically downward;
2. The device for preventing scattering of a coating material containing harmful substances according to claim 1. a cool air outlet through which the compressed air supplied from the compressor is discharged as cool air toward an operator operating the peeling means;
2. The device for preventing scattering of a coating material containing harmful substances according to claim 1, further comprising: A method for preventing scattering of a coating material containing a harmful substance, comprising the steps of: grinding and removing a coating material containing a harmful substance applied to a structure with a removing means; and preventing scattering of dust of the coating material ground off within a work area, the method comprising the steps of:
a step of discharging a strip of compressed air supplied from a compressor disposed so as to surround the working area in the height, width, and depth directions of the building from a strip outlet directed downward from above the building;
a step of suctioning and purifying the air in the working area containing the dust moved by the compressed air discharged from the strip-shaped discharge port by a suction means;
A method for preventing scattering of a coating material containing a harmful substance, comprising: A scaffolding for preventing scattering of a coating material containing a harmful substance, which prevents scattering of dust of the coating material ground inside a work area in which a coating material containing a harmful substance applied to a building is ground and peeled off by a peeling means, comprising:
a strip-shaped discharge port that is disposed so as to surround the working area in the height, width, and depth directions of the building, and through which the strip-shaped compressed air supplied from the compressor is discharged from above the building downward;
a suction means for suctioning and purifying the air in the working area, including the dust moved by the compressed air discharged from the strip-shaped discharge port;
A scaffolding that prevents scattering of coating materials containing harmful substances, characterized by comprising: