JP2007218069A - Asbestos treating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treating method for asbestos in the roof space improving safety, reducing cost and shortening a construction period. <P>SOLUTION: This asbestos treating method for a building with a ceiling board 4 provided below a ceiling skeleton 1 with an asbestos layer 2 through the roof space 3 comprises a process for boring a nozzle insertion hole 5 in the ceiling board 4; a process for inserting an injection nozzle 6 into the roof space 3 from the nozzle insertion hole 5; and a process for injecting an asbestos treating agent to the asbestos layer 2 of the ceiling skeleton 1 from the inserted injection nozzle 6. The asbestos layer can thereby be treated without removing the ceiling board 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an asbestos treatment method, and more particularly to a treatment method for asbestos in a ceiling.

  The asbestos treatment method used for the building is a method of removing and treating this asbestos (Patent Document 1) and a resin composition as shown in Patent Documents 2 and 3 without peeling the asbestos from the building. There is known a method of performing a containment process by applying to the above. The former seems to be the safest method because it removes the asbestos itself from the building, but it seems to be the safest method, but the safety of workers during the removal work, the impact on the surrounding environment during the removal work, asbestos removal Problems such as waste disposal and environmental pollution. The latter, on the other hand, treats asbestos sprayed on the building in a safe state without peeling, and there is no problem of disposal of the removed asbestos and associated environmental pollution. It can be said that the safety of the worker during the work and the influence on the surrounding environment during the removal work are relatively small.

  However, in any case, when asbestos treatment is performed on a building including a ceiling case having an asbestos layer and a ceiling plate provided below the ceiling case via a ceiling back space. Removes the ceiling board and performs the removal work, and performs a containment process such as applying and injecting a resin composition to asbestos. Therefore, there is a possibility that asbestos accumulated on the ceiling plate is scattered when the ceiling plate is removed. In addition, in the case of containment, although there is less scattering than removal, there is a possibility that part of the asbestos of the ceiling frame may be scattered due to the injection pressure of the resin composition at the time of coating and injection, and measures against asbestos scattered during these treatment If the operation is not sufficiently performed, the safety of the worker cannot be ensured, and there is also a concern about adverse effects on the surrounding environment. Furthermore, in order to remove the ceiling, the cost for removing the ceiling, the temporary cost for removal, these disposal costs, the curing cost to prevent scattering, the cost for installing the new ceiling after removal, the temporary cost, the cleaning cost, etc. A lot of costs and time are required for removing the ceiling.

JP-A-8-28026 Japanese Patent Publication No. 63-55546 Japanese Patent Laid-Open No. 9-279861

  The object of the present invention is to provide an asbestos treatment method that can reduce the concern about safety associated with the removal of the ceiling plate in the treatment method for asbestos on the back of the ceiling. Another object of the present invention is to provide an asbestos treatment method that can reduce the cost and shorten the work period for removing the ceiling plate when treating the asbestos on the back of the ceiling. Furthermore, another object of the present invention is to provide an asbestos treatment method capable of using the ceiling after treating asbestos on the back of the ceiling in a form close to that before treatment.

The invention according to claim 1 of the present application is directed to an asbestos treatment method for a building including a ceiling case having an asbestos layer and a ceiling plate provided below the ceiling case via a ceiling back space. A step of opening a nozzle insertion hole, a step of inserting an injection nozzle into the ceiling space from the nozzle insertion hole, and a step of injecting an asbestos treatment agent from the inserted injection nozzle onto the asbestos layer of the ceiling casing. An asbestos treatment method is provided.
The invention according to claim 2 of the present application provides the asbestos treatment method according to claim 1, wherein the asbestos treatment agent is sprayed onto the asbestos layer of the ceiling casing and is also sprayed on the top surface of the ceiling plate. .
The invention according to claim 3 of the present application includes a step of inserting an injection nozzle into the space behind the ceiling from the nozzle insertion hole, and inserting the tip of the injection nozzle into the asbestos layer of the ceiling casing, and the injection nozzle inserted And the step of injecting the asbestos treating agent into the asbestos layer of the above-mentioned ceiling casing. 3. An asbestos treatment method according to claim 1, comprising:
In the invention according to claim 4 of the present application, the injection nozzle includes an injection nozzle main body provided at the tip, and an insertion portion that is proximal to the injection nozzle main body and can be inserted into the ceiling space from the nozzle insertion hole. And at least part of the insertion portion is flexible, and the insertion portion is arranged in the ceiling space from the nozzle insertion hole in a state where the flexible portion is deformed. A processing agent is injected, The asbestos processing method in any one of Claims 1-3 provided.
In the invention according to claim 5 of the present application, the injection nozzle includes an injection nozzle main body provided at a tip, and an insertion portion that is proximal to the injection nozzle main body and can be inserted into the ceiling space from the nozzle insertion hole. The asbestos treatment agent is sprayed in a state in which the insertion portion has a contact portion that can be vertically changed and fixed, and the contact portion is in contact with the lower surface of the ceiling plate around the nozzle insertion hole. An asbestos treatment method according to any one of claims 1 to 4 is provided.
In the invention according to claim 6 of the present application, the contact portion includes an elastic member on at least the upper surface thereof, and the elastic member is in contact with the lower surface of the ceiling plate around the nozzle insertion hole, and the nozzle insertion hole is centered. The asbestos treatment method according to claim 5, wherein the asbestos treatment agent is jetted while the operating rod is tilted and the tip of the spray nozzle is tilted in the ceiling space.

Since the asbestos treatment method according to the present invention can treat asbestos without removing the entire ceiling panel for the asbestos layer formed on the ceiling frame, there are concerns about safety associated with the removal of the ceiling panel. Can be reduced. Moreover, since processing can be performed without removing the entire ceiling plate, cost reduction and shortening of the construction period can be realized. In addition, asbestos is prevented from scattering during processing, asbestos is less scattered than when the entire ceiling panel is removed, which is advantageous in terms of worker safety and consideration of the surrounding environment. Therefore, to prevent scattering, it is possible to reduce scattering prevention measures during work such as curing and air shower rooms for workers compared to the case of full removal. It may be possible to continue to use the object, and if the user of the building desires, use the ceiling after processing the asbestos on the back of the ceiling in a form close to that before processing. You can also.
In addition to the above effects, the asbestos treatment agent can be sprayed onto the asbestos layer of the above-mentioned ceiling casing and also sprayed on the top surface of the ceiling plate, thereby treating the asbestos dust scattered on the top surface of the ceiling plate. And safety can be further improved.
Inserting an injection nozzle into the ceiling space from the nozzle insertion hole and inserting the tip of the injection nozzle into the asbestos layer of the ceiling casing, and asbestos treatment agent from the inserted injection nozzle of the ceiling casing. By performing the step of injecting into the asbestos layer, an effective treatment can be performed even on the asbestos layer that has been lifted up from the ceiling frame or the asbestos layer having a large thickness.
Providing the flexible portion in the injection nozzle enables the injection to be performed in a wider range and is effective in eliminating the blind spot of the injection due to the unevenness of the ceiling frame.
By spraying the asbestos treatment agent in a state where the contact portion is in contact with the lower surface of the ceiling plate around the nozzle insertion hole, the treatment agent is injected in a state where the distance from the injection nozzle to the ceiling frame is kept at a predetermined interval. As a result, the injection region of asbestos can be properly maintained in each insertion hole, and the risk of leaving an untreated portion of asbestos due to a mistake in the injection work can be reduced.
Further, by spraying the asbestos treatment agent while tilting the tip of the spray nozzle in the ceiling space, spray coating with less unevenness can be performed even when the shape of the ceiling casing is uneven.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view showing an asbestos treatment method according to an embodiment of the present invention, FIG. 2 is a bottom view of a ceiling board in the treatment method, and FIG. 3 is an enlarged view of a main part of FIG. 4 is a sectional view of an injection nozzle body used in the processing method, and FIG. 6 is a perspective view of a closing tool used in the processing method.

  The main target of the asbestos treatment method according to this embodiment is an asbestos layer 2 applied to the surface of the ceiling casing 1 by spraying or the like, as shown in FIG. The asbestos treatment is performed from below the ceiling plate 4 provided via the. The types of the ceiling frame 1 and the ceiling board 4 are not particularly limited, and the type of building such as concrete architecture or wooden construction is not limited, and the ceiling board 4 is also various for wood, gypsum board, etc. Can be used.

  First, nozzle insertion holes 5 are formed in the ceiling plate 4 from below. The insertion hole 5 can be formed using an appropriate tool such as a drill. The size of the insertion hole 5 may be a size capable of inserting a later-described injection nozzle 6 and may be the same as the injection nozzle diameter or larger than the injection nozzle diameter. Specifically, in consideration of the clearance when the injection nozzle is moved up and down and rotated, the diameter is set to 10% or more larger than the diameter of the injection nozzle, and on the other hand, making a hole larger than necessary is the scattering of asbestos. Since it is not preferable from the viewpoint of prevention and restoration of the ceiling plate after asbestos treatment, it is desirable that the diameter is 200% or less of the diameter of the injection nozzle. Specifically, the diameter of the insertion hole 5 is desirably 5 to 50 mm, more desirably about 10 to 30 mm, and most desirably 20 mm or less.

  The insertion holes 5 of the ceiling plate 4 are desirably provided at predetermined intervals, and as shown in FIG. The distance a between the adjacent insertion holes 5 is preferably 500 mm or more, and more preferably 700 mm or more, from the viewpoint of work efficiency and modification of the ceiling board after work. On the other hand, if the interval is too wide, there is a possibility that the coating unevenness described later may occur, so that it is preferably 1500 mm or less, more preferably 1000 mm or less.

  Next, the dimension between the lower surface of the ceiling board 4 and the ceiling housing 1 is confirmed. This may be confirmed in advance by a drawing of the building, but the distance to the ceiling housing 1 or the asbestos layer 2 is measured by inserting a ruler or a rod-like body from the insertion hole 5 described above. May be. If the ceiling housing 1 has irregularities, the lowermost part may be set as a reference value, but the case where the downward projecting part is extremely small (for example, 10% or less of the total area) is mostly used. The portion occupying the area may be set as the reference value.

  Next, the injection nozzle 6 is inserted from the insertion hole 5 formed in the ceiling plate 4. As shown in FIG. 3, the injection nozzle 6 includes an insertion portion 61 made of a long pipe and an injection nozzle main body 62 provided at the distal end of the insertion portion 61. A processing agent jet 63 is connected. The injector 63 has a built-in on-off valve that can adjust the flow rate, and by operating the lever 64 of the injector 63, the injection can be stopped and stopped. A reservoir 65 such as a tank containing asbestos treatment liquid is connected to the injector 63 via a pump p by a hose or the like. Although not shown, when an air gun is used as the injector 63, necessary devices such as a compressor are connected. The injection nozzle body 62 may be a full cone injection nozzle showing a full cone injection pattern, but using a full cone injection nozzle showing a full pyramid injection pattern s as shown in FIG. This is advantageous in that the amount of injection between the injection nozzles 6 inserted from the insertion holes 5 can be easily set equal. The injection angle of the injection nozzle is preferably about 90 to 130 degrees, and it is desirable to use a wide-angle injection nozzle of 90 degrees or more. Although the internal structure of the injection nozzle body 62 can be changed as appropriate, it is desirable to have a waller 66 as shown in FIG.

  The coating area by spraying is determined by the spray angle of the spray nozzle and the relationship between the spray nozzle and the surface to be coated. Therefore, when inserting the injection nozzle 6, it is possible to set each insertion hole 5 so that the space between the injection hole of the injection nozzle body 62 and the asbestos layer 2 of the ceiling casing 1 is kept constant. This is important in that spray coating is performed without unevenness. Therefore, a contact portion 67 capable of adjusting the vertical position is provided in the insertion portion 61. The contact portion 67 is preferably larger than the insertion hole 5 and can close the entire insertion hole 5 from below, and specifically has a diameter about 5 to 50 mm larger than the insertion hole 5. Is desirable. A more specific example is shown in FIG. 3. The contact portion 67 includes a central through-hole into which the insertion portion 61 is slidably inserted and has a screw hole in the radial direction. And an elastic member 69 having a central through hole provided in the upper portion. A screw is screwed into the screw hole through the insertion portion 61 of the injection nozzle into these central through holes, and fixed at a predetermined position. In order to easily set the fixed position, the injection nozzle insertion portion 61 may be provided with a dimension display such as a scale. Further, as fixing means, in addition to a screw hole and a screw, a clip-like thing using a spring member, a thing using various clamping mechanisms, etc., the contact part 67 is positioned in the axial direction with respect to the insertion part 61. Various modifications can be made as long as they can be fixed in a changeable manner. The elastic member 69 is preferably a plate having elasticity such as soft rubber or foamed urethane, so that the elastic member 69 is inserted in a state in which the elastic member 69 is in contact with the lower surface of the ceiling plate 4 around the insertion hole 5. By tilting the injector 63 below the insertion portion 61 around the hole 5, the processing agent can be sprayed while tilting the spray nozzle body 62 in the ceiling space, and in the tilted state, it can be moved back and forth and left and right. It is also desirable to swivel. In addition to the elastic member 69, the contact portion 67 and the insertion portion 61 may be connected via a pivotable bearing.

  A setting position of the contact portion 67 will be described. Here, as shown in FIG. 1, the distance between adjacent insertion holes 5 is a, and the distance between the ceiling plate 4 and the ceiling housing 1 (the reference between the lower surface of the ceiling plate 4 and the ceiling housing 1 described above). Value) is b, the distance between the contact portion 67 and the injection hole of the injection nozzle body 62 is c, and the injection angle of the injection nozzle is d, for example, a = 930 mm, b = 400 mm, c = Assuming 50 mm and d = 110 degrees, the distance between the injection hole of the injection nozzle body 62 and the ceiling casing 1 is bc = 350 mm, and the size of the coating pattern of the treatment liquid applied to the ceiling casing 1 is tan 55 × 350 mm × 2 = 1000 mm. This value is larger than a = 930 mm, and it can be seen that spray coating can be performed with an overlap margin. However, it is desirable to set these values in consideration of the relationship between the injection angle and the actual injection width, but in this example, the upper surface of the elastic member 69 is positioned at a position of c = 50 mm. What is necessary is just to set the position of the contact part 67. FIG. Therefore, at one work site, the position of the abutting portion 67 is set to an appropriate position, and the ceiling housing is ejected in a state where the abutting portion 67 is in contact with the lower surface of the ceiling plate 4 for each insertion hole 5. The treatment agent can be spray-coated on the entire asbestos layer 2 without any unevenness and with a certain overlap. The value of the distance a between the adjacent insertion holes 5 is desirably 500 to 1500 mm as described above, and more desirably 700 to 1000. Further, the spray angle of the spray nozzle is preferably about 90 to 130 degrees, and in relation to the distance b between the ceiling plate 4 and the ceiling housing 1 determined by the value of the existing building, the contact portion 67 and the spray nozzle The length of the insertion portion of the injection nozzle is preferably about 50 to 2000 mm so that the distance c between the main body 62 and the injection hole can be set to an appropriate value. Furthermore, as described above, the processing agent can be sprayed in a wider range by spraying the processing agent while tilting the spray nozzle body 62 in the ceiling space 3. Further, when the ceiling housing 1 has irregularities, the insertion portion 61 may be sprayed while moving up and down.

Moreover, as shown in FIG. 5, it is also desirable to implement the insertion part 61 as having flexibility. Here, “flexible” means that it can be bent at least by the power of a human hand, and the bent shape can be substantially maintained even if the force is removed. Specifically, a copper tube is suitable. ing. In addition, a flexible pipe having a corrugated cross section can be used, but a smooth inner peripheral surface is desirable from the viewpoint of good injection and maintenance. As the material, copper or its alloy metal or synthetic resin can be used. The flexible portion f may be about 300 to 500 mm in an appropriate section between the injection nozzle main body 62 and the injector 63. However, the portion f having the flexibility is approximately the entire length between the injection nozzle main body 62 and the injector 63. Alternatively, the length can be changed as appropriate, and flexible portions f may be provided at a plurality of locations in the longitudinal direction.
Thus, by providing the flexible part f, the insertion part 61 is arranged in the ceiling space 3 from the nozzle insertion hole 5 in a state where the part f is deformed, and the asbestos treatment agent is sprayed. be able to. Thereby, even if the ceiling housing 1 has large unevenness, the treatment agent can be sprayed without unevenness. Further, by bending the flexible portion f a little, or by curving it into a bow shape as a whole, it is possible to inject the tip injection nozzle body 62 in an inclined state, Furthermore, by injecting the injector 63 while rotating 360 degrees, it is possible to draw a circle with a large injection range of the processing agent.
Further, as shown in FIG. 5, a CCD camera c or the like may be inserted from another nozzle insertion hole 5, and the injection work may be performed while checking the shape and the injection state of the ceiling housing 1 with the monitor m. . In that case, the construction record can also be left by recording the situation before and after construction and the situation during construction with a suitable recording medium such as electronic data or film as a moving image or a still image.

  As described above, the spray nozzle 6 is inserted into each insertion hole 5 with a predetermined length, and the treatment agent is sprayed in the form of a mist, so that the entire asbestos layer 2 of the ceiling casing 1 is coated and impregnated with the treatment agent. At that time, it is appropriate that the hydraulic pressure (the hydraulic pressure immediately before the injection nozzle body 62) is 0.5 to 10 MPa, and the injection time in one insertion hole 5 is about 5 to 15 seconds. In particular, by spraying a sufficient amount, the treatment agent is applied and impregnated into the asbestos layer 2 and spreads over the ceiling back space 3 to indirectly spread the upper surface of the ceiling plate 4. As a result, the asbestos accumulated on the upper surface of the ceiling plate 4 can be treated with the treatment liquid. Moreover, it is also desirable to inject directly on the upper surface of the ceiling board 4 by using together the injection nozzle formed in the horizontal direction or the downward direction from the injection nozzle.

  When the thickness of the asbestos layer 2 is large, a processing agent may be injected by inserting a thin injection nozzle into the asbestos layer 2, and in this case, the injection nozzle 5 is connected to the injection nozzle from the injection hole 5. Insert until layer 2 is reached. This injection nozzle has a thickness that can be easily inserted into the asbestos layer 2 by human force, and can be implemented as a nail-like or conical shape with an injection hole at the tip. In addition, in the portion where the asbestos layer 2 is partially peeled and floated, this injection nozzle is inserted to inject the treatment agent, and then a rod-shaped pressing member is inserted from the insertion hole 5. Then, it is desirable to eliminate the lifting by pressing (rolling) the portion that has lifted.

  Here, a description will be given of a desirable injection procedure including a countermeasure for the floating portion. First, preliminary injection is performed on the entire ceiling space. This injection is performed by inserting a nozzle for injection from each insertion hole 5 and injecting the treatment agent into the space behind the ceiling. The nozzle body has a relatively small hole diameter (0.1 to 0.20 mm in diameter). Is used to preliminarily harden the surface of the asbestos layer 2, the asbestos on the top surface of the ceiling board 4, and the floating asbestos. Next, the above injection and rolling process are performed on the floating portion. Finally, the main injection is performed. This inserts the nozzle for injection from each insertion hole 5, and injects to the whole asbestos layer 2 of the ceiling housing 1 in the above-mentioned way. In these treatments, the following treatment agents can be used. The concentration of the treatment agent may be adjusted by adding water. At that time, it is desirable that the preliminary injection is the thinnest, then the floating part is processed, and the main injection is the darkest. It can be implemented with appropriate changes.

  As the treating agent, one having a containment effect on the asbestos layer and having high permeability is suitable. Specifically, it is composed mainly of a synthetic resin and an inorganic flame retardant. The synthetic resin includes vinyl or acrylic homopolymer, vinyl-acrylic copolymer, vinyl-ethylene-acrylic copolymer. Examples thereof include mer and styrene-acrylic acid ester copolymer. As the inorganic flame retardant, chlorinated paraffin (chlorine content of 40 to 75% by weight) is suitable, and a combination of aluminum hydroxide and magnesium hydroxide may be used. Furthermore, it is also preferable to add inorganic fillers such as silica, calcium carbonate, kaolin and mica, and wetting agents such as hydroxymethylcellulose, methylhydroxyethylcellulose and carboxymethylcellulose, and cellulose swelling agents such as hydroxyethylcellulose and carboxymethylcellulose. It may be added. When chlorinated paraffin (chlorine content: 40 to 75% by weight) is used as the inorganic flame retardant, the blending ratio is 16 to 1600 parts by weight of the inorganic flame retardant with respect to 100 parts by weight of the synthetic resin, and the inorganic filler. Is preferably 16 to 1600 parts by weight. When chlorinated paraffin (chlorine content: 40 to 75% by weight) is used as the inorganic flame retardant, 100 to 1200 parts by weight of the inorganic flame retardant and 100 inorganic fillers to 100 parts by weight of the synthetic resin. It is desirable to be -1200 parts by weight. Moreover, after spraying the said processing agent as a 1st processing agent, you may spray another processing agent as a 2nd processing agent. As a 2nd processing agent, a vinyl acetate acrylate copolymer, an acrylic resin Those that form a resin coating with high hermeticity, such as modified acrylic resins, are suitable.

  After the injection process, the insertion hole 5 may be closed from below, and the ceiling plate 4 may be coated from the lower surface or a decorative paper may be applied as necessary. When closing the insertion hole 5, a putty or the like may be used. As shown in FIG. 6, a closing tool 7 having a lower surface flange 72 at the lower end of the cylinder part 71 is used, and the cylinder part 71 is attached to the insertion hole 5. It can also be inserted and glued as necessary to close it.

  The steps from the formation of each insertion hole 5 to the sealing of the insertion hole 5 may be performed sequentially one by one for each insertion hole 5, and a plurality of injection nozzles 6 are used as shown in FIG. The plurality of insertion holes 5 may be performed simultaneously. In addition, the step of forming the insertion holes 5 may be performed by sequentially injecting the treatment agent after opening a large number of insertion holes 5 at a time, but considering the sealing of the ceiling space during processing. Then, it is desirable to continuously perform the steps from the formation process of the insertion hole 5 to the sealing for one insertion hole 5 and perform the process of forming the next insertion hole 5 after the sealing is completed. . Moreover, the processing method of the present invention can be used as a final process of asbestos only by this process, but can also be implemented as a pre-process of the removal removal process. In addition, for example, when considering the treatment of one room, the ceiling plate is partially peeled off (for example, the ceiling near the pillar), and the treatment method of the present invention is adopted for the central portion. The processing method of this invention can also be implemented.

It is a front view which shows the asbestos processing method which concerns on embodiment of this invention. It is a bottom view of the ceiling board in the processing method. It is a principal part enlarged view of FIG. It is sectional drawing of the injection nozzle main body used for the processing method. It is a front view which shows the asbestos processing method which concerns on other embodiment of this invention. It is a perspective view of the closing tool used for the processing method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceiling housing 2 Asbestos layer 3 Ceiling back space 4 Ceiling board 5 Nozzle insertion hole 6 Injection nozzle 61 Insertion part 62 Injection nozzle main body 63 Injection machine 67 Contact part 68 Positioning part 69 Elastic member

Claims (6)

In an asbestos treatment method for a building including a ceiling case having an asbestos layer and a ceiling plate provided below the ceiling case via a ceiling back space,
A process of making nozzle insertion holes in the ceiling plate;
Inserting the injection nozzle into the ceiling space from the nozzle insertion hole;
And a step of spraying an asbestos treating agent from the inserted spray nozzle onto the asbestos layer of the ceiling casing. The asbestos treatment method according to claim 1, wherein the asbestos treatment agent is sprayed on the asbestos layer of the ceiling casing and is also sprayed on the top surface of the ceiling plate. Inserting the nozzle for injection into the space behind the ceiling from the nozzle insertion hole, and inserting the tip of the nozzle for injection into the asbestos layer of the above-mentioned ceiling housing;
The asbestos treatment method according to claim 1, further comprising a step of injecting an asbestos treatment agent into the asbestos layer of the ceiling casing from the inserted injection nozzle. The injection nozzle includes an injection nozzle main body provided at a distal end and an insertion portion that is proximal to the injection nozzle main body and can be inserted into the ceiling space from the nozzle insertion hole, and the insertion portion is at least partially Is flexible, and in a state where the flexible portion is deformed, the insertion portion is arranged in the ceiling space from the nozzle insertion hole and the asbestos treatment agent is sprayed. The asbestos processing method in any one of Claims 1-3. The injection nozzle includes an injection nozzle main body provided at the tip and an insertion portion that is proximal to the injection nozzle main body and can be inserted into the ceiling space from the nozzle insertion hole. The asbestos treatment agent is sprayed in a state in which a contact portion that can be fixed is provided and the contact portion is in contact with the lower surface of the ceiling plate around the nozzle insertion hole. Asbestos treatment method according to claim 1. The contact portion includes an elastic member on at least the upper surface thereof, and in a state where the elastic member is in contact with the lower surface of the ceiling plate around the nozzle insertion hole, the operation rod is tilted around the nozzle insertion hole to The asbestos treatment method according to claim 5, wherein the asbestos treatment agent is sprayed while tilting in the space behind the ceiling.

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