JPH0351480A - Removing method and device of sprayed asbestos - Google Patents

Abstract

PURPOSE:To improve the working efficiency and to reform the working environment by connecting a portable cutting tool, predusters, a dust collector, and a blower unit in series, and forming a pipeline system in which the air absorption force acts to the whole system. CONSTITUTION:A portable cutting tool 14 with a motive power, predusters 15 and 15a, a dust collector 16 with a high quality filter, and a blower unit 17 are provided. Then, they are connected in a series condition to link up each other, and the air absorption force of the blower unit 17 is made to act to the whole system by forming an airtight pipeline system. And, a worker M operates the cutting tool 14 by hands to cut and remove an asbestos layer A, and cracks are collected to the collection bags 33... in the predusters 15 and 15a, while the powder dust is collected to the dust collector 16, forcibly automatically by the absorption force of the blower unit 17.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to ceiling surfaces of various buildings, ships, vehicles, etc.
This invention relates to a method and apparatus for safely, reliably and efficiently removing asbestos layers sprayed onto walls, frames, and other treated surfaces.

<Conventional technology> As is well known, sprayed asbestos has excellent properties such as sound absorption, heat insulation, dew condensation prevention, and fire resistance, and because its construction surface can be finished with a seamless, smooth fiber layer, it is used in various buildings. Initially, it was widely applied to vehicles and ships, but based on the revision of the Regulations for Prevention of Hazards Due to Specified Chemical Substances under the Industrial Safety and Health Act, its use has been prohibited in principle since 1975 as a specially controlled substance. .

However, the asbestos layer that had been sprayed by then,
The binder material deteriorates and loses its shape due to aging, etc., and the fine t+Jllw. remains suspended in the air as dust for a long time. Since this can cause serious injury to the human body, there has recently been a strong call for measures to be taken to prevent it from scattering, and working environment standards have also been established.

As a measure to prevent scattering, the first layer of asbestos is solidified into a capsule shape by spraying and penetrating the chemical.
There are ``containment methods'' and ``enclosure methods'' by doubling ceiling surfaces, etc. These methods allow work to be done in a relatively short time and are economically advantageous, but on the other hand, they are equivalent to renovation work and are still used as asbestos. It is difficult to accept this as a drastic countermeasure because it will result in the layer remaining as a source of air pollution.

Therefore, in practice, "removal (stripping and removal)" which corresponds to demolition work.
The "Act" is considered the best countermeasure, and has traditionally been implemented as follows.

Aim 9 In other words, Figure 13 shows the removal of asbestos N (A) that has been sprayed onto the ceiling surface (C) of a building. As such, a temporary clean room (1) is attached to the work site (R) where the asbestos layer (A) exists, where workers (M) come and go to change their clothes and wash their bodies, and all of the work is completed. The lining of curing sheets (2) provides a complete isolation room from the outside air, and the isolated work site.
In the room of R), there is a work stand (3) for the worker (M), as well as a high-performance (formerly GH Efficiency Port).
iculator＾ir) Negative pressure machine or whole ventilation system with filter f1 (bag filter for working environment) (4)
and a sprayer (5).

In order to increase the effectiveness of negative pressure and ventilation, the room may be further partitioned as necessary, and the ventilation system (4
) is kept in operation from beginning to end to generate airflow in the direction of the arrow (Y).

Next, as part of the "removal work process," the worker (M) enters the work site (R) from the clean room (1) and first sprays water to prevent dust generation toward the asbestos Ilif (A). A chemical solution (6) is then sprayed, and then a scraper (7) such as a spatula or a scraping stick is held, thereby scraping off the wet asbestos (A) in an orderly manner.

During the work process, the spatula used as the scraper (7) is replaced with various types of spatulas, or wire brushes for stripping instead of the spatula, and the manual labor is repeated {=J
give After the fM is scraped off, the pieces (8) of the asbestos layer (A) that have fallen and accumulated on the floor (F) are scooped up and collected using tools such as a shovel, and then manually placed into the designated collection bag (9).・It is sealed.

Finally, in the "post-processing process," the sealed collection bag (9) is carried out all at once outside the work site (R) and disposed of at a designated location, while the floor surface (F) is vacuumed. In addition to cleaning with a vacuum cleaner, etc., the clean room (1) prepared above is cleaned in an amount of 11kLll.

<Problems to be Solved by the Invention> However, in the conventional removal method, as is self-evident from the explanation of the work process above, the first problem is that the scraper (7) requires manual labor such as a spatula, scraper, or wire brush. It is a reliable tool, so even if a group of workers (M) are working on it, it is not easy to obtain a beautiful removal effect, and the tools must be replaced as appropriate and manual labor must be applied repeatedly. Must be.

In addition, this work requires an unnatural posture on the stand (3), resulting in extremely hard labor. Furthermore,
The scraper (7) tends to damage the ceiling surface (C), and there is also the problem that a replacement for the asbestos layer (A) cannot be installed correctly later.

Second, the asbestos layer (
Since this is a method of scraping off A) and depositing its fragments (8) on the floor (F), it is essential to use a dust prevention agent (6) and spray water before scraping off the debris. .

Furthermore, even if the spraying is done, a large amount of dust will be generated in the room, which will increase the chances of the worker (M) himself getting injured.Coupled with the fact that the above-mentioned manual tools require a long time, The environment is extremely poor.

Furthermore, a large amount of dust is generated indoors, so a ventilation system (4
) and protective masks, etc., also deteriorate quickly, and the commercially priced filters must be replaced frequently.

Thirdly, because this is a so-called wet process that involves spraying a chemical solution (6) to prevent dust generation or water, it is necessary to avoid contact with such liquids, such as buildings equipped with lighting equipment or other electrical equipment that should not come into contact with such liquids. It is difficult to remove the asbestos layer (A) from the construction surface, and there are restrictions on the application of the removal method.

Fourth, asbestos N (A) fragments (8) are removed from the floor (F
), the fragments (8) must be scooped up with a shovel, and this work also requires hard labor. In particular, if there are lighting equipment, equipment, various fixtures, etc. that cannot be removed from the room at the work site (R) in advance during the preliminary preparation process,
It is extremely difficult to collect them efficiently and completely.

Fifth, the pieces (8) of the asbestos layer (A) also fall onto the work stand (3), which poses a danger to the feet when scraping them off. ) into a predetermined collection bag (9) and sealing it must also be done manually, so it cannot be done continuously and quickly, so to speak, and is extremely troublesome.

In short, it is important not only to completely isolate the work site (R), but also to reliably prevent dust generation from the asbestos layer (A) in the isolation room.
) It is extremely important to prevent one's own exposure, and for this purpose, it is necessary to improve the removal ability or work life, and it cannot be said that conventional removal methods are still insufficient.

<Means to solve the problem> No. 14. Therefore, as a method for removing the sprayed asbestos layer, the work site where the asbestos layer is sprayed on the construction surface is shielded as an isolation room from the outside air, and a negative pressure machine or general ventilation system installed in the room is operated. When removing the asbestos layer while ventilating the room, a hand-held cutting tool was used to remove the asbestos layer, and the pieces were collected. By preparing a pre-duster, a high-performance filter, a dust collector, and a blower unit, and sequentially connecting the devices in series through the first to third flexible ducts, they communicate with each other. Forming an airtight pipe system to which the air suction force of the blower unit acts throughout, and installing at least three devices in total, including the cutting tool, pre-duster, and dust collector, in a room at the work site,
The debris collection bag was made removable and replaceable in the pre-duster, and the debris was loaded and set in such a way that it could automatically accept the debris, and the fragments of the asbestos layer that had been peeled off from the construction surface using the power of 15 were placed in the collection bag. The main feature is that the dust generated by the peeling action is automatically and forcibly collected by the dust collector using the suction force of the blower unit, and as a removal device for carrying out the above method, In order to peel off the sprayed asbestos layer, a cutting tool is moved along the construction surface, and a collection bag is loaded and set to collect the fragments peeled off by the cutting tool. a pre-duster, a dust collector with a built-in high-performance filter to collect the dust generated as a result of the peeling action, and a blower unit that applies air suction to the debris and dust. A hand-held operating handle extends from the tool body case of the cutting tool, and the cutting blade and brush, which are rotated integrally by the drive motor, are pivotally supported on the body case, and the periphery thereof is covered by an integrated elastic cover attached to the main body case. On the other hand, the pre-duster is formed from a container body into which a collection bag is loaded and set, and an opening/closing lid for sealing the container body, and the opening/closing lid of the pre-duster and the tool body case of the cutting tool are attached to the container body. The opening/closing lid and the dust collector are connected through a second flexible duct, and the dust collector and the blower unit are connected through a third flexible duct, so that the cutting tool can be operated by hand by an operator. Then, while moving the cutting blade and brush along the construction surface of the asbestos layer, the pieces of the asbestos layer peeled off by the rotational power are transferred to the collection bag loaded and set inside the container body of the pre-duster, and the pieces of the asbestos layer are removed. The main feature is that the dust generated during the operation is automatically and forcibly collected by the dust collector using the A1-1 suction force of the blower unit.

17 <Example> Hereinafter, the details of the present invention will be explained based on the drawings. Figure 1 shows the overall working scene of the removal device, and (R) shows the construction surface (ceiling surface) (C ) with an asbestos layer (A
) is a typical example of a spray-painted integrated building, and as shown in Figure 13 mentioned at the beginning, it is completely lined with curing sheets (lO) and is shielded as an isolation room from the outside air. At the same time, a negative pressure machine with a high performance (HEPA) filter (11) installed in the room or a general ventilation system (12) is operated to maintain an appropriate working environment from beginning to end.

As is clear from the figure, inside the work site (R) there are not only work stands (13) but also workers (
M)'s hand-held cutting tool (14), pre-duster (15), and dust collector (16) were installed, and a blower unit (17) was also installed outside the room, and the equipment was N[11
8. Needless to say, the blower unit (17) is a unit that includes a fan for sucking air, a motor for rotating the fan, and the like.

First, regarding the cutting tool (14), it is used to remove the sprayed asbestos layer (A) from the construction surface (C), and is a powered tool as shown in Figures 2 to 4. It is unitized as a hand-held tool. That is, the reference numeral (21) in the figure is a pair of hand-held operation handles (2
2), which has a nearly U-shaped cross section, and has a first flexible duct (
One end (inlet part) of 18) is communicatively connected via a fixing band (23).

(24) is a motor holding board fixedly installed horizontally so as to cover the top of the opening of the main body case (21), and a drive motor (25> is attached and integrated at the center of the board). Similarly, there are through holes (26
) is clearly expressed. (27) is the motor holding board (24
> The motor output shaft No. that extends upward from 19 is a blade support disk mounted in parallel with the
A plurality of cutting blades (29) are placed at a constant height (
h) are accumulated and fixed. It goes without saying that its constant height (h) is determined more closely than the thickness (t) of the sprayed surface.

As is clear from FIG. 2, the cutting blades (29) are arranged in the overall turbine airfoil shape in a plan view, and each sharp cutting edge is formed on the circumferential surface of the support disk (27). The support disk (27) is intersected by a constant angle (θ) of less than 90 degrees, and together with the rotational driving force of the support disk (27) in the direction of the arrow (P), the asbestos N (A) is removed.

(30) is a stripping brush that is integrated with the upright back surface of each cutting blade (two) so as to be located on the trailing side in the direction of rotation (P). The tip of the brush (3l) is a fixed base of the brush (30).

The brush (30) is located in a position that correctly faces the locus of action of the cutting blade (29), thereby preventing the cutting blade (29) from remaining peeled off and making it possible to completely remove asbestos lm(A). , by protruding taller than the cutting blade (29) by the above-mentioned certain amount (d), it can be effectively connected to the construction surface (C) at all times without causing any damage to the construction surface (C). It is designed to do the following.

In that case, the plurality of cutting blades (29) and brushes (30) are all continuously peeled off by the rotation of the support disk (27), so that each cutting blade To the standing nIJ of (29), brush (30)
may be attached. In addition, the arbitrary number of cutting blades (2
Regarding 9), the brush (30) may be partially attached in a so-called open U state. Furthermore, the cutting blade (2
9) between adjacent brushes (30).
It is also possible to plant the support disk (27) integrally from the plate surface of the support disk (27) using a separate base.

(32) is an integrated elastic cover that extends from the upper edge of the opening of the tool body case (21) to cover the cutting blade (29) and the brush (30). It is made of plastic flocked brush material, fiber material, membrane material, etc., which is more flexible than the brush (30), or it is made of asbestos layer (A
) and its construction surface (C), and completely seals the inside of the attached main body case (21).

Fragments (a) of the asbestos layer (A) peeled off by the cutting blade (29) and brush (30) are attached to the cutting tool (14).
It is designed to fall into the main body case (21) without leaking to the outside, and then continues through the motor holding plate (24) (26). 1 flexible duct (18).

In the figure, the motor (25) is connected to the tool body case (21).
However, as long as the cutting blade (29) and brush (30), which are rotationally driven by the cutting blade (29) and the brush (30), can be surrounded by the elastic cover (32), the motor (25) can be installed outside the main body case (21). By assembling it into a unit, it can be finished as a cutting tool (14).

Although the rotary motion mechanism of the brush (30) has been shown, if it is a hand-held powered cutting tool (14), the reciprocating linear motion mechanism of the cutting blade (29) and brush (30), etc. You can use whatever fits.

Next, speaking of Pre-Duster (15), this is...
Ashes tuft (A>) using the second cutting tool (14)
This is for collecting fragments (a) of Nos. 5 to 7.
As shown in the enlarged diagram, a container body (34) that can receive and set the debris collection bag (33) and an opening/closing lid (35) that seals the opening top surface of the container body (34) are included. In the center of the opening/closing lid (35) is the inner cylinder (36) of the banshou no 1 kigawa, and the outer cylinder (37) for introducing debris surrounding it.
) are integrally vertically erected with open lower surfaces communicating with the container body (34).

Then, connect the first flexible duct (18) to the circumferential surface of the outer cylinder (37) as shown in
) is connected to the other end (outlet part) via the coupling (38).In other words, the opening/closing lid (35) of the container body (34) functions as a cyclone tower, and the Na23 a) , it has become possible to introduce it naturally and rationally without omission. The inner cylinder (36) protrudes taller than the outer cylinder (37), and a second flexible duct ('
19) - Nitsubu (Population Department) is also coupled (3
Similarly, the other end (outlet part) of the second flexible duct (19) is also connected to the dust collector (16). (40) is a coupling for connecting the other end.

(41) is a seal seat attached to the opening/closing lid (35), and (42) is a swivel wheel pivotally supported on the bottom surface of the container body (34), which is used to move around the room at the work site (R). useful for. Based on the same purpose, the above work stand (1
3), the dust collector (16), and the blower unit (17) are also preferably attached with flexible wheels to make them portable.

In that case, as suggested from FIG.
In other words, if the collection bag (33) inside the container body (34) is installed in parallel as a spare pre-duster (15a) and the same collection bag (33) is loaded inside it, the collection bag (33) inside the container body (34) will contain asbestos. When it becomes full with the debris (a) of layer (A), immediately turn on the spare pre-duster (15a) with its opening/closing lid (35) still connected to the first and second flexible ducts (18) and (19). Container body (33.1
) It can be said that it is advantageous in that it is possible to collect the debris (, )) extremely efficiently by installing four scaffolds. This is because interruption of the peeling operation using the cutting tool (14) can be avoided as much as possible.

Further, FIG. 8 shows a modification of the pre-duster (15), in which the main container body (34) is a funnel-shaped hopper (34b) and is fixed by a plurality of pillars (43). In addition to being supported, the lower end of the opening is determined to be able to be opened and closed by a rotary hub (44) attached thereto. Then, the container body (34b
) to the lower end cap (45) of the debris (a) collection bag (
33) can be detachably and replaceably attached using a fixing band (46) or the like. Note that (47) is a drive motor for the valve (44).

If such a modified pre-duster (15b) is adopted, when the collection bag (33) is full, the 11h
25 By activating the rotary valve (44) in response to a full detection signal and keeping the lower end of the opening of the hopper (34b) closed, the collection bag (33) can be attached and detached and replaced. Even while working, the hopper (
Since the fragments (a) are automatically collected in 34b), there is no need to interrupt the peeling operation using the cutting tool (14), and the collection operation can be carried out continuously. There is.

The dust collector (16) mentioned earlier has a built-in high-performance (HEPA) filter (48), which also removes dust. And that dust collector (16
) and the blower unit (17) are connected to each other via the third flexible duct (20),
The suction force of the blower unit (17) removes the asbestos JTF (A) fragments (a) from the cutting tool (14).
) from the main body case (21) through the first flexible duct (18) to the collection bag (
33), it is forcibly transported by air. 1'm2 of blower unit (17)
It is formed as a 6-line system.

In addition, the dust generated during this process is also removed by the pre-duster (
15), passes through a second flexible duct (19), and is collected into a dust collector (l6).

In other words, all of the fragments (a) of the asbestos layer (A), including their dust, are isolated so as not to leak or dissipate openly into the room of the work site (R). Furthermore, (49
) is a coupling for connecting one end (portion) of the third flexible duct (20) to the dust collector (16).

Ahead is the dust collector (16) for the room at the work site (R).
The dust collector (16) and blower unit (17)
) are separate and independent devices, and they are connected to each other by the third flexible duct (20). However, the dust collector (16) is connected to the blower unit ( By attaching and integrating the target 27 (20) in advance, it is possible to omit the installation and use of the target 27 (20) in one device. In this case, the dust collector (1) with its blower unit (17)
6), it is of course installed indoors at the work site (R).

In Fig. 1, for the sake of simplifying the explanation, one (flit) cutting tool (one
4), but as shown in the modified usage example in Figure 10, the pre-duster (15) is enlarged and multiple cutting tools (14
) may be used, each connected in overall parallel condition by a first flexible duct (18).

In addition, a plurality of second flexible ducts (19) are used, such as one dust collector (16) being used for a plurality of cutting tools (t4) and pre-dusters (15), in another modified usage example shown in Figure 11. It is also possible to connect them in parallel.

Furthermore, as is clear from FIG. 12, which corresponds to FIG.
) If the exhaust outlet (50) of the ventilator (50) is connected directly or indirectly through an extension duct or the like so as to face the general ventilation system (12), it can also be used as the high-performance filter (11) of the ventilation system (12). Dust collector (1
The expensive filter (48) in step 6) can be omitted, which is beneficial for cost reduction.

Effect〉 Using the above removal device, remove the ceiling surface (construction surface) of the building (
When removing the first layer of Assu (A) which is blown into C), a group of several people were required to remove it (A). A worker (M) enters a room at a work site (R) that is isolated from the outside air, and there are not only a work stand (13) and a general ventilation system (12), but also a cutting tool (14) and a pre-duster ( 15) and the dust collector (16) are installed in a serially connected state through the first to third flexible ducts (18), (19), and (20), and the container body of the pre-duster (15) is installed. A debris collection bag (33) is also loaded and set in (34) in advance.

At that time, the blower unit (l7) is lm as shown in the same figure.
29, this can be installed outside the work site (R), or as explained in the modified usage example in Figure 12, it can be installed in the vicinity, such as by discharging the exhaust air towards the general ventilation system (12). It may be installed in advance indoors.

Then, while the blower unit (17) and general ventilation system (12) are in operation, one of the workers (M) stands on the work stand (13) and holds the cutting tool (
14) in hand, move it in one direction (X) along the construction surface (C), and use the cutting blade (29) and brush (30) to which the driving force is applied.
The asbestos layer (A) is sequentially peeled off.

Then, the tool body case (
21) and the pre-duster (15) are connected to each other via the first flexible duct I{18), and the air suction force from the blower unit I-(17) is connected to the conduit system. Therefore, the peeled ashes}i (
The fragments (a) of A) pass through the inside of the first flexible duct (18), and together with the dust inside the pre-duster (15), the dust is automatically collected in the dust collector}1 (16) and sent to the work site (R ) will not leak or dissipate into the room.

Eventually, when the collection bag (33) is full of debris (a), one of the other workers (M) picks up the pre-duster (1).
5) Open the lid, take out the collection bag (33) from the container body (34), quickly tie it up and keep it sealed, and then take it all at once to the outside of the work site (R). I will do it.

In that case, as noted in Figure 1, the container body (34a)
A spare pre-duster (15a) with a collection bag (33) loaded and set inside is also placed in parallel near the above-mentioned pre-duster (15) with the original opening/closing lid (35), and the opening/closing lid is opened when it is full. (35) only as a spare pre-duster (15a
), the workability can be further improved, and dust generation into the room and exposure of the worker (M) himself can be effectively prevented.

Furthermore, it is suggested from the modified usage examples in Figs.
If they are connected in parallel so that they are all concentrated in the large pre-duster (15) through the corresponding first flexible duct (18), the removal work time of the asbestos layer (A) can be significantly shortened. can.

At that time, the container body (34) is also used as a pre-duster (15) as shown in the modified example of FIG.
34b), the lower end of the opening is controlled to open and close by a rotary valve (44), and when the collection bag (33) is replaced by closing, the fragments (a) are automatically removed.
If the setting is such that the particles are collected in the hopper (34b), there is no need to interrupt the stripping operation using the cutting tool (14), which greatly contributes to improving the overall efficiency of the removal operation.

Earlier, we focused on sprayed asbestos N (A) installed on the ceiling surface (C) of a building and explained its removal work. This method can be applied in exactly the same way to the removal work of the sprayed asbestos layer (A) on which the construction surface is, and also to vehicles and ships other than buildings.

Furthermore, the present invention can also be applied to and removed from construction surfaces sprayed with rock wool instead of asbestos or a mixture of the two.

It goes without saying that the preliminary preparation steps and post-processing steps for the above-mentioned removal work are performed in the same manner as in the conventional method described at the beginning.

<Effects of the Invention> As described above, the sprayed asbestos layer (A) according to the present invention
In the removal method, asbestos N (A) is removed from the construction surface (C).
The work site (R) where the asbestos is being sprayed is shielded as an isolation room from the outside air, and a negative pressure machine or general ventilation system (12) installed in the room is operated (IJ is used to remove asbestos H during ventilation in the room). (A), a powered hand-held cutting tool (14) for peeling off the asbestos layer (A) and the peeled off pieces (a) are used.
), a dust collector (16) with a high-performance filter (48), and a Bunu 33 lower unit (l7) are prepared, and the equipment is sequentially installed in the first to third flexible units. Duct (1
8) By connecting the blower unit (17) in series with each other through (19) and (20),
), and form an airtight pipe system where the air suction force of the
) and its pre-duster (15)
The collection bag (33) for debris (a) is detachable and replaceable,
In addition, the fragment (a) was loaded and set in such a state that it could be accepted by itself, and while the worker (M) held the cutting tool (14) in his hand, the worker (M) used the power to peel it off from the construction surface (C). Fragments (a) of the asbestos layer (A) are transferred to a collection bag (33), and dust generated as a result of the peeling action is transferred to a dust collector (16).
In both cases, the collection is automatically forced by the suction force of the blower unit (17), which completely solves the problems of the conventional method mentioned at the beginning. 14) is moved along the construction surface (C) to remove asbestos N (A) by its mechanical force, so the work can be done very easily and the removal processing capacity is also significantly increased. In that case, if the methods described in claims 2 to 4 are adopted, the workability can be further improved.

Moreover, from the cutting tool (14) to the blower unit (l7)
) are connected in series through the first to third flexible ducts (18), (19), and (20). It is formed as an airtight pipe system where the air suction force of (15) and dust collector (16)
Because they are automatically forced to be collected,
There is no dust entering the room at the work site (R), and from that point of view, the room is especially clean. 35 Not only does the worker (M) himself have to be safely isolated from the danger of exposure, but as a result, it is not necessary to spray water or chemical solution (6) to prevent dust generation as in the conventional method. There is no need to do this, and the work can be done from beginning to end as work, and an excellent work environment can be provided.

Furthermore, the collection bag (33) for debris (a) is a pre-duster (1
The blower unit (17) is loaded into the blower unit (17) in a state where the fragment (a) is securely received.
The debris (, J) that received the suction force is automatically collected into the collection bag (33), so unlike the conventional method, using a shovel or other tool, The collection bag (
The complicated manual work of scooping and collecting the fragments (8) into the bag 9) is completely unnecessary, and when the bag is full, it is sufficient to simply tie it up, and the collection bag (33) can be sealed extremely efficiently.

Such an effect can be achieved in exactly the same way even if the method described in claim 5 is adopted, and the use of the third flexible duct (20) can also be omitted. . In particular, if the method described in claim 6 is adopted, the use of the expensive filter (4B) built into the dust collector (16) can be omitted, resulting in 4Y reductions in costs. It is.

In the present invention, no dust is generated inside the room at the work site (R), and all the dust that is separated is collected in the dust collector (16) through an airtight pipe system. , the exhaust air no longer contains dust when it is discharged from the blower unit (1.7). Therefore, even if the air is directed to the general ventilation system (12) and released outside the room through this, it will cause serious health problems to the human body under the general environment! This is because there is no way to go.

As described in claim 7, the removal device for carrying out the above method is particularly suitable for a cutting blade (29).
Since it uses a hand-held cutting tool (14) whose brush (30) is rotationally driven by a motor (25), the removal work can be carried out with ease. ) can be reliably visited, and a highly accurate removal effect that does not cause damage to the construction surface (C) can be achieved.

It is also extremely easy and reliable to install a replacement product on the construction surface (C) after its removal.

As a result of the significantly increased removal ability, it is possible to effectively prevent the generation of dust that accompanies the peeling action. Since it is collected and sucked into the first flexible duct (18), it is very useful for preventing the hand-held worker (M) from being exposed to dust.

Furthermore, the pre-duster (15) is claimed in claim 8,
As specified in Section 9, the opening/closing lid (35) is given a cyclone effect to collect debris, or the container body (35) is
If 4) is made into a special form of the hopper (34b) that is controlled to open and close by the rotary halve (44), the ability to remove asbestos N (A) can be further improved. 14 I think this is a significant benefit.

38 Fig. 1 is an overall schematic explanatory diagram showing the removal work of blown F4 asbestos H according to the present invention, Fig. 2 is a plan view showing the cutting tool extracted, and Fig. 3 is the same as 3 in Fig. 2. - A developed cross-sectional view along line 3, Figure 4 is a cross-sectional view showing how the cutting tool is used on the construction surface of the asbestos layer, Figures 5 and 6 are cross-sectional views showing the assembled and disassembled states of the pre-duster, Figure 7 is a sectional view of the opening/closing lid taken along line 7 in Figure 6, Figure 8 is a partially cutaway side view showing a modified example of the pre-duster in its connected and used state, and Figure 9 is a modified example of the dust collector. Side view showing 1st
Figures 0 and 11 are explanatory diagrams showing different modification examples of the connection and use of the cutting tool, the pre-duster, and the dust collector.
FIG. 2 is an overall schematic explanatory diagram showing another modified example of the work scene corresponding to FIG. 1, and FIG. 13 is an overall schematic explanatory diagram of the removal work scene according to the conventional method.

(12)・・・・・・General ventilation system (14)・・・Cutting tool (15) (15a) (15b) ・Pre-duster (l7) ・ ・ ・ ・ ・ (18) (19) ( 20) ・ (21) ・ ・ ・ ・ ・ (22) ・ ・ ・ ・ ・ (25) ・ ・ ・ ・ ・ (29) ・ ・ ・ ・ ・ (30) ・ ・ ・ ・ ・ (32) ・ ・ ・ ・・ (33) ・ ・ ・ ・ ・ (34) (34a) (34b) (35) ・ ・ ・ ・ ・ (36) ・ ・ ・ ・ ・ (37> ・ ・ ・ ・ ・ (44) ・ ・ ・ ・ ・（４８） ・ ・ ・ ・ ・ (A) ・ ・ ・ ・ ・ (C) ・ ・ ・ ・ ・ (F) ・ ・ ・ ・ ・ (M) ・ ・ ・ ・ ・ (R) ・ ・ ・ ・ ・ ・Professional Waring unit, flexible duct, tool body case, hand-held operation handle, motor, cutting blade, brush, elastic cover, collection bag, container body, opening/closing lid, inner cylinder, outer cylinder, rotary valve, high-performance filter, asbestos layer, construction Surface (ceiling surface) ・Floor surface/Worker/Work site floor 39 (X) ・Movement operation direction (a) ・Debris

Claims (1)

[Claims] 1. The work site (R) where the asbestos layer (A) is sprayed on the construction surface (C) is shielded as an isolation room from the outside air, and a negative pressure machine or the whole is installed in the room. Ventilation system (12)
Due to the operation of the asbestos layer (A) during the ventilation of the room.
In removing the asbestos layer (A), a powered hand-held cutting tool (14) is used to remove the asbestos layer (A), and the removed pieces (a) are used.
), a dust collector (16) with a high-performance filter (48), and a blower unit (17) are prepared, and the equipment is sequentially installed in the
By connecting the flexible ducts (18), (19), and (20) in series so as to communicate with each other, an airtight pipe system is formed on which the air suction force of the blower unit (17) acts on the entire system; A total of at least three devices, including the cutting tool (14), pre-duster (15), and dust collector (16), are installed at the work site (R
) and its pre-duster (15)
The collection bag (33) for debris (a) is detachable and replaceable,
Moreover, the asbestos was peeled off from the construction surface (C) by the power of the worker (M) while holding and operating the cutting tool (14) after loading and setting the fragment (a) in a state where it could automatically accept it. The fragments (a) of the layer (A) are transferred to the collection bag (33), and the dust generated due to the peeling action is transferred to the dust collector (16), both automatically and forcibly by the suction force of the blower unit (17). A method for removing a sprayed asbestos layer characterized by collection. 2. A pre-duster (15) is formed from a container body (34) into which the collection bag (33) is received and loaded, and an opening/closing lid (35) that forms a cyclone tower, and the collection bag (33) is placed in a room near the container body (34). However, a spare pre-duster (15a) consisting only of the container body (34a) that has been received and loaded is installed in parallel, and the collection bag (33) in the original pre-duster (15) is full of debris (a). The method for removing a sprayed asbestos layer according to claim 1, characterized in that when the condition is reached, the opening/closing lid (35) is placed over the container body (34a) of the preliminary pre-duster (15a). 3. Prepare a plurality of cutting tools (14) for each worker (M) to carry and use, and transfer each tool to the common pre-duster (15) through the corresponding first flexible duct (18). The method for removing a sprayed asbestos layer according to claim 1, characterized in that the sprayed asbestos layer is connected in parallel so as to be concentrated. 4. A plurality of cutting tools (14) and pre-dusters (15) are connected in series through the corresponding first flexible ducts (18), and each of the pre-dusters (15) is connected to each other in series. Common dust collector (16
), the second flexible duct (19)
2. The method for removing a sprayed asbestos layer according to claim 1, wherein the method is connected in parallel. 5. The method for removing a sprayed asbestos layer according to claim 1, characterized in that the blower unit (17) is attached and integrated with the dust collector (16) and installed in a room at the work site (R). 6. Place the blower unit (17) in a positional relationship corresponding to the negative pressure machine or general ventilation system (12) at the work site (
R) is installed in the room, and the exhaust discharged from the blower unit (17) is
The method for removing a sprayed asbestos layer according to claim 1, characterized in that the sprayed asbestos layer is discharged to the outside through a negative pressure machine or a general ventilation system (12). 7. Cutting tool (14) that is moved along the construction surface (C) to remove the sprayed asbestos layer (A)
a pre-duster (15) into which the collection bag (33) is received and loaded to collect the fragments (a) peeled off by the cutting tool (14); A dust collector (1) with a built-in high-performance filter (48) is used to collect dust.
6), and a blower unit (17) that applies air suction force to the debris (a) and dust, the hand-held operation handle (22) extends from the tool body case (21) of the cutting tool (14), and the A cutting blade (29) and a brush (30), which are integrally rotated by a drive motor (25), are pivotally supported on the main body case (21), and an elastic cover (32) attached and integrated with the main body case (21) surrounds them. ), the pre-duster (15) is formed from a container body (34) into which the collection bag (33) is loaded and set, and an opening/closing lid (35) that seals the container body (34). The opening/closing lid (35) of the pre-duster (15) and the tool body case (21) of the cutting tool (14) are connected through the first flexible duct (18), and the opening/closing lid (35) and the dust collector (16) ) is connected to the second flexible duct (19), and the dust collector (16) and blower unit (17) are connected to the third flexible duct (2).
0), the cutting tools (14
) is hand-held by the worker (M), and the cutting blade (29
) and brush (30) on the enforcement side (C) of the asbestos layer (A).
) while moving it along the pre-duster (15
) The collection bag (3) loaded and set inside the container body (34)
3), and the dust generated due to the peeling action is automatically and forcibly collected by the dust collector (16) by the air suction force of the blower unit (17). Equipment for removing sprayed asbestos layers. 8. The opening/closing lid (35) of the pre-duster (15) is formed into a double structure of an inner cylinder (36) and an outer cylinder (37), both of which communicate with the container body (34), and the inner cylinder ( 36), and the end of the first flexible duct (18) is connected so as to be tangential to the circumferential surface of the outer cylinder (37). 8. The sprayed asbestos layer removal apparatus according to claim 7, wherein the opening/closing lid (35) is provided with a cyclonic action of the debris (a). 9. The container body (34) of the pre-duster (15) is shaped as a funnel-shaped hopper (34b), and its opening lower end is defined so that it can be opened and closed by a rotary valve (44) attached thereto. 8. The sprayed asbestos layer removal apparatus according to claim 7, wherein a collection bag (33) is detachably and replaceably loaded and set at the lower end of the opening.