JP7514520B2 - Harmful substance dispersion prevention device and harmful substance dispersion prevention method - Google Patents

Description

The present invention relates to a harmful substance dispersion prevention device and a harmful substance dispersion prevention method, and in particular to a harmful substance dispersion prevention device and a harmful substance dispersion prevention method that prevent dispersion of harmful substances caused by removing harmful substances attached to the inside of a chimney of a building using an ultra-high pressure hot water injection 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 example, asbestos was used in a wide variety of structures, from ordinary homes to public facilities such as schools. For this reason, many existing buildings still contain construction materials that contain asbestos.

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.

By the way, asbestos has excellent heat resistance and has been used as a variety of insulation materials. For example, asbestos is used as insulation material inside chimneys.
Chimneys are attached to combustion equipment such as diesel engines, boilers, bath heaters, etc. Chimneys play a role in ensuring that these combustion equipment burn efficiently and in releasing the combustion gases generated by combustion into the atmosphere.

The combustion gases released from chimneys are made up of various compositions depending on the materials being burned. For example, when materials containing sulfur are burned, sulfurous acid gas is produced. The heat inside the chimney causes the sulfurous acid gas to change into sulfuric acid. For this reason, the inside of the chimney needs to be chemically resistant to these compositions.

The temperature of the combustion gases emitted from the chimney can reach 500°C or higher, depending on the size of the combustion device and the material being burned. For this reason, the inside of the chimney needs to be heat-resistant to the high temperatures of combustion.

Because chimneys are subject to the effects of combustion gases and heat, insulation made from asbestos, which has chemical and heat resistance, has been installed inside chimneys. This has allowed chimneys to be used for a long period of time.

However, if a chimney-equipped building deteriorates and is damaged, or if a building that contains asbestos in its chimney is demolished, 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.

Therefore, work is being carried out to remove the insulation material, including asbestos, that was installed inside the chimney. In addition, when removing the asbestos from inside the chimney, the top and bottom of the chimney are covered to isolate and seal them separately, to prevent harmful substances such as asbestos dust from scattering outside the work area.

For example, a sludge water disposal system has been developed that disposes of sludge water containing asbestos that is generated by a method of removing asbestos-containing lining materials from chimneys by spraying ultra-high pressure water onto them (for example, Patent Document 1).

FIG. 5 is a diagram showing the entire sludge water waste treatment system disclosed in Patent Document 1.
As shown in Figure 5, the sludge water waste treatment system 10 is a sludge water waste treatment system that disposes of sludge water 12 containing asbestos that is generated when removing asbestos by spraying ultra-high pressure water onto the asbestos-containing lining material of a chimney.

Specifically, a super-high pressure water injection device is inserted into the chimney from the isolated and sealed top of the chimney, and super-high pressure water is injected into the lining material of the chimney that contains asbestos, removing the asbestos attached to the inside of the chimney.

The sludge water waste treatment system 10 includes a first isolation and curing area 14, a second isolation and curing area 16, and an air conveyor 18.
The first isolation curing area 14 is located at the discharge port 20 at the bottom of the chimney, and is an area set up for the purpose of carrying out the work of suctioning the sludge water 12 containing asbestos that has been peeled off by the injection of ultra-high pressure water.

The second isolation and curing area 16 is located in a separate location from the first isolation and curing area 14, and is an area set up for the disposal of the sludge water 12 containing asbestos that has been sucked up in the first isolation and curing area 14.

The air conveyor 18 is a device for sucking and transporting the sludge water 12 sucked in from the first isolation and curing area 14, which is provided at the discharge port 20 at the bottom of the chimney, to the storage tank 22 in the second isolation and curing area 16.

By operating the air conveyor 18, the sludge water 12 containing asbestos that has been peeled off by the spraying of ultra-high pressure water can be disposed of in the first isolation and curing area 14 and the second isolation and curing area 16.

JP 2017-106258 A

However, when the asbestos attached inside the chimney is removed by spraying ultra-high pressure water while the chimney head and bottom are isolated and sealed, there is a problem that the working environment becomes worse for the worker who inserts the ultra-high pressure water spraying device into the chimney from the chimney head.

As disclosed in Patent Document 1, ultra-high pressure water is generally used at a temperature of about 80°C to make it easier to remove dirt and paint. Of course, ultra-high pressure hot water is also used to remove asbestos from inside chimneys, to make it easier to remove the asbestos and dirt from inside the chimney.

However, when trying to remove asbestos attached inside a chimney using this ultra-high pressure hot water, the chimney effect causes the dust containing the removed asbestos to rise toward the top of the chimney.

The asbestos-containing dust that rises toward the top of the chimney ends up trapped in the isolated and sealed chimney head. This causes problems such as a deterioration of the working environment for workers at the top of the chimney.

This chimney effect occurs when air that is warmer than the outside air is present inside a chimney. The hot air is less dense and lighter than the cold air, so it rises inside the chimney. At this time, outside air is taken in through the air intake at the bottom of the chimney. This causes the warm air to rise while air is taken in through the air intake.

The super-pressure hot water injected into the chimney is 80°C, which is hotter than the outside air, so when super-pressure hot water is injected from the chimney, the air inside the chimney rises from the bottom to the top. This rising air also causes the air containing asbestos to rise.

In the sludge water waste treatment system disclosed in Patent Document 1, the top of the chimney is isolated and sealed, so the rising air containing asbestos becomes trapped in the sealed space at the top of the chimney. This creates a poor working environment for the workers who insert the ultra-high pressure water injection device into the chimney from the top of the chimney.

One way to remove asbestos contained in the air that rises due to this chimney effect is to wait until the temperature inside the chimney drops and the asbestos-containing air stops rising, and then suck up the asbestos that falls due to gravity in the first isolation curing area 14.

In this case, the inside of the chimney remains hot while the stripping treatment is being performed with the ultra-high pressure water jetting device, so after the stripping treatment with the ultra-high pressure water jetting device is finished, it is necessary to wait until the temperature inside the chimney drops. As a result, it takes a long time to collect all of the asbestos that has risen inside the chimney due to the chimney effect, which leads to a decrease in work efficiency.

There are also ways to suppress the chimney effect and prevent the air containing asbestos from rising. For example, by lowering the temperature of the ultra-high pressure water, the temperature inside the chimney can be suppressed, and the stripping work can be carried out at the same temperature as the outside air. This makes it possible to suppress the air containing asbestos from rising.

However, if the temperature of the ultra-high pressure water is lowered, the problem arises that it takes a long time to remove the asbestos. Inside the chimney, dirt and ash from combustion products have built up on the surface of the insulation material, which contains asbestos, due to years of use. As the dirt that has built up on this surface must also be removed, the only way to remove the asbestos in a short time is to use ultra-high pressure hot water to remove the dirt and asbestos.

The present invention was made in consideration of these points, and aims to provide a harmful substance dispersion prevention device and a harmful substance dispersion prevention method that can improve the working environment in the work area and perform asbestos removal work in a short time.

In order to solve the above problems, the present invention provides a scattering prevention device that prevents scattering of harmful substances caused by the use of ultra-high pressure hot water injection means to peel off harmful substances attached to the inside of a chimney of a building, characterized by comprising: a chimney head dust collection and exhaust means that collects dust from the air in a chimney head work chamber in which the ultra-high pressure hot water injection means is operated at the top of the chimney, which is isolated and sealed from the outside of the building by an isolation means, and discharges the purified air to the outside of the building; and a chimney bottom dust collection and exhaust means that collects dust from the air in a chimney bottom work chamber in which the work of removing the harmful substances peeled off by the operation of the ultra-high pressure hot water injection means is performed at the bottom of the chimney, which is isolated and sealed from other areas within the building by an isolation means, and discharges the purified air to other areas within the building.

In this way, at the top of the chimney, which is isolated and sealed from the outside of the building by the isolation means, the chimney top dust collection and exhaust means collects dust from the air in the chimney top work chamber where the ultra-high pressure hot water injection means is operated, and the purified air is discharged outside the building, and at the bottom of the chimney, which is isolated and sealed from other areas within the building by the isolation means, the chimney bottom dust collection and exhaust means collects dust from the air in the chimney bottom work chamber where the work of removing harmful substances peeled off by the operation of the ultra-high pressure hot water injection means is performed, and the purified air is discharged to other areas within the building.

The present invention also provides a method for preventing the dispersion of harmful substances caused by the use of ultra-high pressure hot water injection means to remove harmful substances attached to the inside of a chimney of a building, the method comprising the steps of: collecting dust from the air in a chimney head work chamber for operating the ultra-high pressure hot water injection means at the top of the chimney, which is isolated and sealed from the outside of the building by an isolation means, with a chimney head dust collection and exhaust means, and discharging the purified air to the outside of the building; and collecting dust from the air chimney lower dust collection and exhaust means in a chimney lower work chamber for removing the harmful substances removed by operating the ultra-high pressure hot water injection means at the bottom of the chimney, which is isolated and sealed from other areas within the building by an isolation means, with a chimney lower dust collection and exhaust means, and discharging the purified air to other areas within the building.

In this way, at the top of the chimney, which is isolated and sealed from the outside of the structure by the building isolation means, the chimney top dust collection and exhaust means collects dust from the air in the chimney top workroom where the ultra-high pressure hot water injection means is operated, and the purified air is discharged outside the building, and at the bottom of the chimney, which is isolated and sealed from other areas within the building by the isolation means, the chimney bottom dust collection and exhaust means collects dust from the air in the chimney bottom workroom where the work of removing harmful substances that have been stripped by the operation of the ultra-high pressure hot water injection means is performed, and the purified air is discharged to other areas within the building.

According to the harmful substance dispersion prevention device and harmful substance dispersion prevention method of the present invention, the chimney head dust collection and exhaust means collects dust from the air in the chimney head work chamber where the ultra-high pressure hot water injection means is operated at the top of the chimney, which is isolated and sealed from the outside of the building by the isolation means, and exhausts the purified air to the outside of the building, and the chimney lower dust collection and exhaust means collects dust from the air in the chimney lower work chamber where the ultra-high pressure hot water injection means is operated at the bottom of the chimney, which is isolated and sealed from other areas within the building by the isolation means, and exhausts the purified air to other areas within the building, improving the working environment in the work area.

Specifically, dust containing harmful substances that is detached due to the chimney effect rises toward the top of the chimney, but the chimney head dust collection and exhaust means collects the air in the chimney head work chamber, so the air containing harmful substances does not stagnate in the chimney head work chamber.

In addition, because the air containing harmful substances does not remain in the chimney head work chamber, there is no need to wait for the temperature inside the chimney, which has risen due to the high-pressure hot water sprayed, to drop and for the dust containing harmful substances to fall. This means that the work of removing harmful substances can be completed in a short period of time.

Furthermore, even if a chimney effect occurs, the working environment of the workers working in the chimney head workroom does not deteriorate, so hot water can be used to efficiently remove dirt and insulation inside the chimney. This allows the work of removing insulation containing harmful substances to be completed in a short period of time.

1 is a cross-sectional view showing a harmful substance dispersion prevention device according to an embodiment of the present invention. A cross-sectional view showing an enclosed space isolated and sealed by a chimney lower working chamber and a chimney head working chamber. 1 is a cross-sectional view showing an example of air flow when ultra-high pressure hot water is injected inside a chimney. FIG. 2 is a cross-sectional view showing the structure of a security zone, which is an example of an intake means. FIG. 1 is a diagram showing an entire sludge water waste treatment system disclosed in Patent Document 1.

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 removes a heat insulating material 220 containing harmful substances attached inside a chimney 210 of a building 200 from scattering around the surrounding area. An example of the harmful substance is asbestos.

As shown in FIG. 1, a scaffold 300, a temporary structure that provides a foothold for people working at height during construction work, is assembled around the chimney 210 of the building 200.

In this embodiment, an example is shown in which the top of the chimney 210 is provided to protrude upward from the roof slab line (RFL) of the building structure 200, and the lower part of the chimney 210 is provided on the first floor floor (1FL) (Floor Line). At this time, the scaffolding 300 is assembled from the roof surface RFL as shown in FIG. 1, and installed around the periphery of the chimney 210.

In addition, when the top of the chimney 210 is installed so as to protrude above ground level and the lower part of the chimney 210 is installed on the underground floor, the scaffolding 300 is assembled from the ground level at a height that allows workers to reach the top of the chimney 210.

When a worker stands on this scaffolding 300, he or she can insert an ultra-high pressure hot water injection device 400 that injects ultra-high pressure hot water into the chimney 210 from the top of the chimney 210 of the building structure 200.

The ultra-high pressure hot water injection device 400 inserted into the chimney 210 injects ultra-high pressure hot water into the chimney 210 at the insulating material 220 containing harmful substances attached inside the chimney 210. As a result, the insulating material 220 containing harmful substances is peeled off from the chimney 210 by the injected hot water, so that a removal operation can be performed in which the insulating material 220 containing harmful substances attached inside the chimney 210 is ground and removed.

The ultra-high pressure hot water injection device 400 receives ultra-high pressure hot water from an ultra-high pressure hot water generating pump 410 installed, for example, outside the building 200, via a pressure-resistant hose H. An injection nozzle 420 is attached to the tip of the pressure-resistant hose H for injecting the high pressure hot water toward the insulation material 220 containing harmful substances that is installed inside the chimney 210.

The pressure-resistant hose H is inserted vertically downward into the chimney via a pulley 430 provided above the head of the chimney 210. Furthermore, by rotating a hose reel 440 around which the pressure-resistant hose H is wound, the injection nozzle 420 attached to the tip of the pressure-resistant hose H can be adjusted to any height.

This allows ultra-high pressure hot water to be sprayed at any height onto the insulation material 220 containing harmful substances that is installed inside the chimney 210, and by changing the height of the spray nozzle, the insulation material 220 installed inside the chimney 210 can be peeled off from the chimney 210.

The harmful substance dispersion prevention device 100 is equipped with a chimney lower work chamber 110 and a chimney lower dust collection and exhaust means 120 provided at the bottom of the chimney 210, and a chimney head work chamber 130 and a chimney head dust collection and exhaust means 140 provided at the top of the chimney 210.

The lower chimney workroom 110 is a space for removing insulation material 220 that contains harmful substances and that has peeled off inside the chimney 210, and is a space that is sealed and isolated from other areas within the building 200 by protective sheets.

Specifically, protective sheets are attached to the walls, ceiling, and floor of the building 200, forming the understack work chamber 110 in a structure that is isolated and sealed from other areas within the building 200.

The protective sheet is, for example, a plastic sheet 111, which is attached to the wall or ceiling surface. Adjacent plastic sheets 111 are joined so as to overlap, and are attached in an airtight structure so that the air inside the lower chimney work chamber 110 does not leak to the outside.

The floor of the work room 110 under the chimney is covered with a thick double-layered plastic sheet 112, or a sheet made up of two or more layers. This is to prevent the sheet from being damaged when workers walk on it, place tools on it, or move around.

The chimney lower work chamber 110 is also provided so as to communicate with the scraping port 211 provided at the bottom of the chimney 210. This allows the insulation material 220 containing hazardous substances that has been peeled off from the chimney 210 and fallen down to be removed in the chimney lower work chamber 110. The insulation material 220 containing hazardous substances removed in the chimney lower work chamber 110 is treated using a method that conforms to the standards for specially controlled industrial waste, etc.

The chimney lower dust collecting and exhausting means 120 is provided, for example, to separate the chimney lower work room 110 from other areas within the building 200 via a plastic sheet 111. The chimney lower dust collecting and exhausting means 120 is also intended to collect harmful substances generated in the chimney lower work room 110 and exhaust the purified air to other areas within the building 200.

The chimney head workroom 130 is a space for inserting the injection nozzle 420 of the ultra-high pressure hot water injection device 400 into the chimney 210, and is a space that is isolated and sealed from the outside of the structure 200 by attaching protective sheets around the scaffolding 300.

Specifically, protective sheets are attached to the periphery of the scaffolding 300, the ceiling surface, the treads, and the RFL, which is the roof surface of the structure 200, forming the chimney head workroom 130 with a structure that is isolated and sealed from the outside of the structure 200.

The protective sheet is, for example, a plastic sheet 131, which is attached to the inside surface and inner ceiling surface surrounded by the scaffolding 300. Adjacent plastic sheets 131 are joined so as to overlap, and are attached in an airtight structure so that the air inside the chimney head work chamber 130 does not leak to the outside air.

A thick double-layered plastic sheet 132, or a sheet made up of two or more layers, is attached to the step that forms the floor of the chimney head workroom 130. This is to prevent the protective sheet from being damaged when workers walk on it, place tools on it, or move around.

The chimney head work chamber 130 is also provided so as to communicate with the exhaust port 212 provided at the top of the chimney 210. This allows the work of inserting the injection nozzle 420 of the ultra-high pressure hot water injection device 400 into the inside of the chimney 210 to be performed within the chimney head work chamber 130, which is isolated and sealed from the outside of the building 200.

The chimney head dust collection and exhaust means 140 is provided, for example, to separate the chimney head workroom 130 from the outside of the building 200 via a plastic sheet 131. The chimney head dust collection and exhaust means 140 is also intended to collect harmful substances generated in the chimney head workroom 130 and exhaust the purified air to the outside of the building 200.

In addition, a fireproof sheet 133 with fireproof properties can be installed on the outer surface surrounded by the scaffolding 300. In this way, even if combustion gas remains in the chimney 210 and ignites, the fireproof sheet 133 can prevent the fire from spreading to the surrounding area outside the structure 200.

Furthermore, by attaching a fireproof sheet 133 to the outside of the plastic sheet 131 and double plastic sheet 132 attached to the inside surface and inner ceiling surface surrounded by the scaffolding 300, the chimney head workroom 130 can be isolated and sealed with a double structure. This effectively prevents dust from the insulation material 220, which contains harmful substances, from scattering to the outside.

Furthermore, it is advisable to provide a slope on the outer upper surface of the plastic sheet 131 attached to the inner ceiling surface surrounded by the scaffolding 300, with the fireproof sheet 133a slanted toward one side of the periphery of the scaffolding 300. This allows rainwater to flow along the slope, so that even in rainy weather, rain can be prevented from accumulating on the protective sheet on the ceiling surface and damaging the protective sheet.

In FIG. 1, the chimney head dust collection and exhaust means 140 is illustrated as being installed on a step board provided on the middle floor of the scaffolding 300, but by extending the duct hose connected to the chimney head dust collection and exhaust means 140, it may be installed on the RFL, which is the roof surface of the building 200, or on the ground surface.

As described above, the discharge port 211 provided at the bottom of the chimney 210 is isolated from other areas within the building 200 by the chimney bottom work room 110 being installed therein. In addition, the exhaust port 212 provided at the top of the chimney 210 is isolated from the outside of the building 200 by the chimney top work room 130 being installed therein.

As a result, the chimney 210 can form an enclosed space that is isolated and sealed off by the chimney lower work chamber 110 and the chimney head work chamber 130, and work to remove the insulation material 220 containing harmful substances can be carried out within this enclosed space.

The removal process involves inserting the injection nozzle 420 of the ultra-high pressure hot water injection device 400 into the top of the chimney 210, and then moving the injection nozzle 420 downward while injecting ultra-high pressure hot water. This causes the insulation material 220, which contains harmful substances and is attached inside the chimney 210, to be peeled off from the top to the bottom of the chimney 210.

At this time, the dust of the insulation material 220 containing harmful substances that has been peeled off due to the chimney effect will rise toward the top of the chimney 210. Therefore, by installing the chimney head dust collection and exhaust means 140 in the chimney head workroom 130, the chimney head dust collection and exhaust means 140 can collect the dust of the insulation material 220 containing harmful substances that has risen.

This prevents dust from the insulation material 220, which contains harmful substances and rises due to the chimney effect, from accumulating in the chimney head work chamber 130. Therefore, workers can work comfortably in the chimney head work chamber 130, where dust from the insulation material 220, which contains harmful substances, does not accumulate.

In addition, the dust of the insulating material 220 containing harmful substances that is peeled off by the ultra-high pressure hot water injection device 400 moves downward due to gravity and the falling ultra-high pressure hot water. The dust of the insulating material 220 containing harmful substances that moves downward can be collected by the chimney lower dust collection and exhaust means 120 installed in the chimney lower work chamber 110.

As a result, the dust from the insulation material 220, which contains harmful substances, does not accumulate in the chimney lower work chamber 110. Therefore, workers can work comfortably in the chimney lower work chamber 110, where dust from the insulation material 220, which contains harmful substances, does not accumulate.

The area around the chimney 210 is isolated and sealed by the chimney lower work chamber 110 and the chimney head work chamber 130, and when the air in the sealed space is sucked in by the chimney lower dust collection and exhaust means 120 and the chimney head dust collection and exhaust means 140, the sealed space becomes negative pressure. This prevents dust from the insulation material 220, which contains harmful substances and is generated in the sealed space, from scattering to the outside.

In addition, if the air in the sealed space continues to be sucked in by the chimney lower dust collection and exhaust means 120 and the chimney head dust collection and exhaust means 140, there is a risk that the protective sheets forming the chimney lower work chamber 110 and the chimney head work chamber 130 will be deformed due to excessive negative pressure.

Therefore, it is advisable to provide an intake means for taking in outside air between the protective sheets, between the protective sheets and the building 200, and in security zones for entering and exiting the enclosed space. Security zones will be described later.

At this time, the amount of intake air taken in from the intake means is set to be equal to or less than the exhaust amount exhausted after dust collection by the chimney lower dust collection exhaust means 120 and the chimney head dust collection exhaust means 140. If the amount of intake air taken in from the intake means is smaller than the exhaust amount of the chimney lower dust collection exhaust means 120 and the chimney head dust collection exhaust means 140, the shape, number, and installation location of the intake means can be set as desired.

By providing an air intake means in the sealed space thus formed, it is possible to maintain an appropriate negative pressure state within the sealed space while discharging air through the chimney lower dust collection and exhaust means 120 and the chimney head dust collection and exhaust means 140.

FIG. 2 is a cross-sectional view showing an enclosed space isolated and sealed by a chimney lower working chamber and a chimney head working chamber.
As shown in Figure 2, in the harmful substance dispersion prevention device 100, the top and bottom of the chimney 210 are isolated and sealed by the chimney lower work chamber 110 and the chimney head work chamber 130, forming one sealed space C (the gray filled area in Figure 2).

As a result, even if the insulation material 220 containing harmful substances attached inside the chimney 210 is peeled off, dust from the insulation material 220 containing harmful substances will not scatter outside the building 200 or to other areas within the building 200.

In addition, the air inside the sealed space C is collected by the chimney lower dust collection and exhaust means 120 and the chimney head dust collection and exhaust means 140 and exhausted to the outside of the sealed space C. This makes the air pressure inside the sealed space C lower than the air pressure outside. Therefore, dust from the insulation material 220, which contains harmful substances generated inside the sealed space C, is not scattered to the outside of the sealed space C.

FIG. 3 is a cross-sectional view showing an example of air flow when ultra-high pressure hot water is injected into a chimney.
As shown in Fig. 3, the dust of the insulation material 220 containing harmful substances peeled off by the ultra-high pressure hot water injection device 400 descends to the bottom of the chimney 210 due to the gravity of the dust and together with the falling ultra-high pressure hot water. The descending dust of the insulation material 220 containing harmful substances is collected by the lower chimney dust collecting and exhausting means 120 installed in the lower chimney working chamber 110 as indicated by the arrow D.

As a result, the dust from the insulation material 220, which contains harmful substances, does not accumulate in the chimney lower work chamber 110. Therefore, workers can work comfortably in the chimney lower work chamber 110, where dust from the insulation material 220, which contains harmful substances, does not accumulate.

In addition, the dust of the insulating material 220 containing harmful substances peeled off by the ultra-high pressure hot water injection device 400 rises toward the top of the chimney 210 due to the chimney effect. The rising dust of the insulating material 220 containing harmful substances is collected by the chimney head dust collection and exhaust means 140 installed in the chimney head workroom 130, as shown by the arrow U.

As a result, dust from the insulation material 220, which contains harmful substances and rises due to the chimney effect, does not remain in the chimney head work chamber 130. Therefore, workers can work comfortably in the chimney head work chamber 130, where dust from the insulation material 220, which contains harmful substances, does not remain.

FIG. 4 is a cross-sectional view showing the structure of a security zone, which is an example of an intake means.
As shown in FIG. 4, the intake means for maintaining the sealed space C at a constant negative pressure is provided, for example, in a security zone 150 for entering and exiting the sealed space C.

The security zone 150 referred to here is installed at the entrance to the lower chimney work chamber 110, which is an enclosed space C, when performing work to remove the insulation material 220 containing peeled-off hazardous substances, and is the entrance used when workers enter and exit the enclosed space C.

The lower chimney work chamber 110 is equipped with a lower chimney dust collection and exhaust means 120 that collects and exhausts the air inside the sealed space C. The lower chimney dust collection and exhaust means 120 uses a filter to remove dust from the insulation material 220, which contains harmful substances, from the air inside the lower chimney work chamber 110, and exhausts the purified air to other areas within the building 200 or to the outside of the building 200.

The security zone 150 includes a changing room 151, a cleaning room 152, and an entrance/exit room 153. The changing room 151, the cleaning room 152, and the entrance/exit room 153 are each separated by walls or the like, and passage between the rooms is possible through doors T provided at the joints.

When a worker who is removing the insulation material 220 containing harmful substances enters the enclosed space C, he or she first changes into work clothes in the changing room 151. Next, he or she takes an air shower in the cleaning room 152 to remove dust and other particles. Finally, he or she passes through the entrance and exit room 153 to enter the understack work room 110, which is the enclosed space C.

Conversely, when a worker leaves the understack work room 110, which is an enclosed space C, he or she takes off and discards their work clothes in the entrance/exit room 153. Next, they take an air shower in the cleaning room 152 to remove dust and other particles containing harmful substances. Finally, they change into their own clothes in the changing room 151.

Since the enclosed space C is kept in a negative pressure state, air from other areas within the building 200 or from outside the building 200 flows through the changing room 151, the cleaning room 152, the entrance/exit room 153, and the under-chimney work room 110 in that order.

The outside air that flows into the lower chimney work chamber 110 is sucked into the lower chimney dust collection and exhaust means 120, and the purified air is exhausted through a filter to other areas within the building 200 or to the outside of the building 200, so the exhausted air does not contain any harmful substances.

In this way, when workers enter and exit the enclosed space C through the security zone 150, air from other areas within the building 200 or from outside the building 200 is drawn into the enclosed space C.

In addition, air from other areas within the building 200 or from outside the building 200 flows into the sealed space C under negative pressure through gaps in the door T installed in the security zone 150, in the order of the changing room 151, the cleaning room 152, the entrance/exit room 153, and the under-chimney work room 110.

This makes it possible to prevent the chimney lower dust collection and exhaust means 120 and the chimney head dust collection and exhaust means 140 from creating an excessively negative pressure state in the enclosed space C. Therefore, since the enclosed space C does not create an excessively negative pressure state, it is possible to prevent the curing sheets forming the chimney lower work chamber 110 and the chimney head work chamber 130 from being deformed by an excessively negative pressure state.

The air intake means needs only to be able to draw in a predetermined amount of air from other areas within the structure 200 or from outside the structure 200 so that the enclosed space C does not become excessively negatively pressurized, and may be a gap formed between the curing sheets or between the curing sheets and the structure 200.

At this time, the size and number of intake means are determined so that the amount of intake air taken in from the intake means is equal to or less than the amount of exhaust air exhausted after dust collection by the chimney lower dust collection and exhaust means 120 and the chimney head dust collection and exhaust means 140. This makes it possible to maintain a negative pressure state inside the sealed space.

In addition, in FIG. 4, an example is described in which the security zone 150 is provided at the entrance/exit of the lower chimney work chamber 110, but it may be provided at any other location for entering and exiting the enclosed space C, and may also be provided at the entrance/exit of the top chimney work chamber 130.

As described above, the chimney lower dust collection and exhaust means 120 collects dust in the chimney lower work chamber 110 inside the enclosed space C, and the air containing harmful substances that has risen due to the chimney effect can be collected by the chimney head dust collection and exhaust means 140 in the chimney head work chamber 130 inside the enclosed space.

As a result, even if a chimney effect occurs, air containing harmful substances does not remain in the chimney head work chamber 130, and the chimney head dust collection and exhaust means 140 can collect dust and exhaust purified air to the outside. In other words, workers working in the chimney head work chamber 130 can also work comfortably.

As a result, there is no need to wait for the temperature inside the chimney, which had risen due to the high-pressure hot water sprayed, to drop and for the dust containing harmful substances to fall, meaning that the work of removing harmful substances can be completed in a short period of time.

In addition, even if a chimney effect occurs, the working environment of the workers working in the chimney head workroom 130 does not deteriorate, so hot water can be used to efficiently remove dirt and insulation 220 from inside the chimney 210. This allows the work of removing insulation 220 containing harmful substances to be completed in a short period of time.

100 Harmful substance dispersion prevention device 110 Chimney lower work room 111, 131 Plastic sheet 112, 132 Double plastic sheet 120 Chimney lower dust collection and exhaust means 130 Chimney head work room 133, 133a Fireproof sheet 140 Chimney head dust collection and exhaust means 150 Security zone 151 Changing room 152 Cleaning room 153 Entrance and exit room 200 Building 210 Chimney 211 Scraping outlet 212 Exhaust outlet 220 Thermal insulation material 300 Scaffolding 400 Ultra-high pressure hot water injection device 410 Ultra-high pressure hot water generating pump 420 Injection nozzle 430 Pulley 440 Hose reel C Sealed space D Arrow H Pressure-resistant hose T Door RFL Roof surface U Arrow

Claims (7)

A scattering prevention device that prevents scattering of harmful substances caused by removing the harmful substances attached to the inside of a chimney of a building with an ultra-high pressure hot water injection means,
a chimney head dust collection and exhaust means for continuously collecting dust from the air in a chimney head working chamber for operating the ultra-high pressure hot water injection means at the top of the chimney, which is isolated and sealed from the outside of the building by an isolation means, and exhausting the purified air to the outside of the building during the operation ;
a chimney lower dust collecting and exhausting means for collecting dust from the air in a working chamber at the lower part of the chimney, which is isolated and sealed from other areas in the building by an isolation means, for carrying out work to remove the hazardous materials peeled off by the operation of the ultra-high pressure hot water injection means, and discharging the purified air to other areas in the building;
A scattering prevention device comprising: an intake means for taking in air from outside the sealed space into the sealed space in order to maintain a predetermined negative pressure state in the sealed space formed by sealing the top and bottom of the chimney with the chimney top working chamber and the chimney bottom working chamber;
2. The shatter prevention device according to claim 1, further comprising: The intake amount of the intake means is
the amount of exhaust gas discharged after dust collection by the chimney top dust collection and exhaust means and the chimney bottom dust collection and exhaust means is equal to or less than the amount of exhaust gas discharged after dust collection;
3. The shatter-prevention device according to claim 2, The intake means is
It is provided in a security zone provided at the portion for entering and exiting the enclosed space,
3. The shatter prevention device according to claim 2, The intake means is
being provided at a joint between the isolation means and another isolation means;
3. The shatter prevention device according to claim 2, The intake means is
being provided at a joint between the isolation means and the building;
3. The shatter-prevention device according to claim 2, A method for preventing the scattering of harmful substances, which is caused by removing harmful substances attached to the inside of a chimney of a building using an ultra-high pressure hot water injection means, comprising:
a step in which, at the top of the chimney which is isolated and sealed from the outside of the building by an isolation means, the chimney top dust collection and exhaust means continuously performs an operation of collecting dust from the air in a chimney top working chamber for performing work to operate the ultra-high pressure hot water injection means and exhausting the purified air to the outside of the building during the work ;
a step of collecting dust from the air in a working chamber at the bottom of the chimney, which is isolated and sealed from other areas in the building by an isolation means , by a dust collecting and exhausting means at the bottom of the chimney, for carrying out work to remove the hazardous materials peeled off by the operation of the ultra-high pressure hot water injection means, and discharging the purified air to other areas in the building;
A method for preventing scattering, comprising: