JP2013144904A - Method for removing sprayed material containing asbestos - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method that can reliably remove a sprayed material containing asbestos without leaving a fiber material contained in the sprayed material containing asbestos in a surface of a substrate, which becomes a face to be sprayed.SOLUTION: In a sprayed material 2 that is sprayed to a surface 1a of a substrate 1 provided with a substrate surface layer 3 formed of an adhesive agent or coating for a spraying material, the method for removing the sprayed material containing asbestos injects an organic solvent 5 having a function of being dissolved in the substrate surface layer 3 into a vicinity of an adhesion interface T between the sprayed material 2 and the substrate 1 by using an injection tool 4, and makes the organic solvent 5 infiltrate along the adhesion interface T.

Description

  The present invention relates to a method for removing asbestos-containing spray material sprayed on the surface of a substrate.

Conventionally, asbestos-containing spray materials such as sprayed asbestos material and asbestos-containing spray rock wool are removed by roughing with a tool such as a keren rod, and then, for example, a residual application mainly composed of cement components using a brush or the like. Kimono is scraped off and polished.
As another removal method, an acidic liquid is injected in the vicinity of the adhesive surface between the spray material and the base material of the spray material using a hand-held syringe, and the spray material is reacted with the acid liquid to be dissolved and peeled off. For example, Patent Document 1 discloses a method of dropping naturally.

JP 2010-185182 A

However, the conventional asbestos removal method has the following problems.
In other words, when applying an adhesive to the base of an asbestos-containing spray material, or when the surface of the base material is coated, the asbestos-containing spray material asbestos and rock wool fibers are included in those materials. It remains stuck after being stabbed. Therefore, in the method of dissolving the spraying material with the acidic liquid as described in Patent Document 1 described above, the fibers stuck in the adhesive and the coating cannot be sufficiently removed, and the base material after the asbestos-containing spraying material is removed There is a possibility that the fibers remain on the surface, and there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and the asbestos-containing spraying material is reliably obtained without remaining in a state where the fibers contained in the asbestos-containing spraying material adhere to the base material surface serving as the spraying surface. It aims at providing the removal method of the asbestos containing spraying material which can be removed.

  In order to achieve the above object, in the method for removing asbestos-containing spray material according to the present invention, the asbestos-containing spray material sprayed on the surface of the base material on which the adhesive or coating for spray material is applied. A method for removing a material, which uses an injection jig to inject an organic solvent having a dissolving function with respect to an adhesive or coating toward the vicinity of the adhesive interface with the base material of the asbestos-containing spray material, It is characterized by allowing the solvent to permeate along the adhesive interface.

In the present invention, since the organic solvent having a peeling function is injected into the adhesive interface between the base material and the asbestos-containing spray material, an adhesive for spraying material or a coating film for coating interposed in the adhesive interface is provided. It can be decomposed and dissolved by a chemical reaction with an organic solvent to reduce the adhesion to the substrate surface. Then, the organic solvent to be injected penetrates along the adhesive interface of the base material, so that the organic solvent diffuses over the entire adhesive interface, so that the asbestos-containing spray material peels off from the base material, and this asbestos-containing spray When the material is applied to the top surface or the side wall, it can be dropped naturally. At this time, since the adhesive or coating for the spraying material is dissolved by the organic solvent, the asbestos-containing spraying material asbestos or rock wool sticks to and adheres to the adhesive or coating for these spraying materials. It will not remain on the surface.
Therefore, even when the base material surface has a complicated shape or when a projection such as a bolt is provided on the base material surface, the asbestos-containing spraying material is removed without leaving any residue. be able to.

  Further, according to the removal method of the present invention, since the asbestos-containing spray material can be naturally dropped and removed only by injecting the organic solvent, for example, there is no need to use a dedicated removal device having a complicated mechanism. In addition, a troublesome work such as polishing after roughing with a keren rod becomes unnecessary. Thus, since a large removal apparatus is not used, even in a narrow work space, the removal work can be performed easily and in a short time.

  Further, in the method for removing an asbestos-containing spray material according to the present invention, the injection jig has a needle-like member that can penetrate into the asbestos-containing spray material, and the tip of the needle-like member has a needle shaft relative to the needle shaft. Injection holes are provided in the orthogonal direction, the needle-like member is inserted into the asbestos-containing material spraying material, and the organic solvent is sprayed in the radial direction with respect to the needle axis through the injection hole with the tip reaching the adhesion interface. It is preferable.

In this case, a simple operation of inserting the needle-like member into the asbestos-containing spray material and injecting an organic solvent is sufficient, and asbestos and rock wool in the spray material are also inserted during the operation of inserting the needle-like member. There is an advantage that can be prevented from scattering.
In addition, since the injection hole of the needle-shaped member is provided in a direction orthogonal to the needle axis, the injection material is blocked by the injection material when the needle-shaped member is inserted into the asbestos-containing spray material. It is possible to prevent such a problem that the injection of the organic solvent from the injection hole is hindered.

  According to the method for removing an asbestos-containing spray material of the present invention, by injecting an organic solvent into the adhesive interface between the base material and the asbestos-containing spray material, the base material surface that becomes the spray surface by the organic solvent It is possible to disassemble the adhesive and coating applied to the adhesive and reduce the adhesion, ensuring that the fibers contained in the asbestos-containing spraying material remain attached to the surface of the substrate and ensure the asbestos-containing spraying material. Can be removed.

It is a side view for demonstrating the removal method of the asbestos containing spraying material by embodiment of this invention. It is sectional drawing of the spraying material used as removal object, and a base material. It is an enlarged view of the injection jig shown in FIG. It is an enlarged view which shows the front-end | tip part of the injection needle shown in FIG. It is a side view which shows the outline | summary of the removal method of a spraying material.

  Hereinafter, the removal method of the asbestos containing spraying material by embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG.

As shown in FIG. 1, the method for removing asbestos-containing spray material according to the present embodiment is a surface of a base material 1 made of a reinforced concrete slab such as a building or a beam made of an H-shaped steel material that supports the slab from below. Asbestos-containing spraying material (hereinafter simply referred to as “spraying material 2”) is applied to the construction. The base material 1 is in a state of being sprayed by a spray material 2 having a spray thickness of, for example, about 25 to 60 mm.
Moreover, as shown in FIG. 2, the base material surface layer 3 which consists of the adhesive for spraying or the coating of the base material 1 is provided in the base material surface 1a.

  In addition, as the spray material 2 containing asbestos, a spray asbestos material, an asbestos-containing spray rock wool, etc. are mentioned. And the intensity | strength of the spraying material 2 is constructed with the material intensity | strength of the grade which can insert the injection needle 42 of the injection jig 4 mentioned later.

  The spraying material 2 is removed by using an injector-type injection jig 4 that can be held by hand to apply an organic solvent 5 having a function of dissolving an adhesive or coating between the base material 1 and the spraying material 2. The spraying material 2 is injected toward the vicinity of the adhesive interface T, dissolved by reacting the spraying material 2 with the organic solvent 5, dropped naturally while being peeled, and the spraying material 2 that has dropped is removed. The adhesion interface T refers to a boundary surface between the base material surface layer 3 and the spray material 2.

  Here, the organic solvent 5 injected in the vicinity of the adhesive interface T includes chloroform, carbon tetrachloride, 1,2-dichloroethane (ethylene dichloride), 1,2-dichloroethylene (acetylene dichloride), and 1.1.・ 2. 2-tetrachloroethane (acetylene tetrachloride), trichloroethylene, carbon disulfide, acetone, isobutyl alcohol, isopropyl alcohol, isopentyl alcohol (isoamyl alcohol), ethyl ether, ethylene glycol monoethyl ether (cellosolve), ethylene Glycol monoethyl ether acetate (cellosolve acetate), ethylene glycol mono-normal-butyl ether (butyl cellosolve), ethylene glycol monomethyl ether (methyl cellosolve), ortho-dichlorobenzene, xylene, Sol, chlorobenzene, isobutyl acetate, isopropyl acetate, isopentyl acetate (isoamyl acetate), ethyl acetate, normal-butyl acetate, normal-propyl acetate, normal-pentyl acetate (normal-amyl acetate), methyl acetate, cyclohexanol, cyclohexanone, 1,4-dioxane, dichloromethane (methylene dichloride), N.N-dimethylformamide, styrene, tetrachloroethylene (perchlorethylene), tetrahydrofuran, 1.1,1-trichloroethane, toluene, normal hexane (hexane), 1-butanol, 2-butanol, methanol, methyl isobutyl ketone, methyl ethyl ketone, methyl cyclohexanol, methyl cyclohexanone, methyl-normal-butyl ketone, gasoline, coal Oil naphtha (including solvent naphtha), petroleum ether, petroleum naphtha, petroleum benzine, turpentine oil, mineral spirit (including mineral thinner, petroleum spirit, white spirit and mineral terpenes), ester solvent, trimethylbenzene (petroleum solvent) Inclusions), 1,3,5-trimethylbenzene (trimethylbenzene-containing materials), cumene (petroleum solvent-containing materials), linear alkylbenzene sulfonates, pure substances or mixtures of naphthalene, aqueous solutions, and the like.

  These organic solvents 5 have a function of reacting with and dissolving the base material surface layer 3 made of an adhesive or a coating as described above. This is for peeling the material surface layer 3. Therefore, the organic solvent 5 is appropriately selected according to the type of the substrate surface layer 3, the material of the spraying material 2, the material of the substrate 1, and the like.

  As shown in FIG. 3, the injection jig 4 for injecting the organic solvent 5 into the adhesive interface T includes a solvent storage portion 41 that can store the organic solvent 5, an injection needle 42 that communicates with the solvent storage portion 41, And an operation unit 43 for operating the volume in the solvent storage unit 41 so that the volume can be increased or decreased.

  As shown in FIG. 4, the injection needle 42 is provided with an injection hole 42 a (needle-like member) at the tip in a direction perpendicular to the needle axis, and the injection hole 42 a in a state where the tip reaches the adhesion interface T. Thus, the organic solvent 5 is jetted in the radial direction with respect to the needle axis (see FIG. 5). Since the injection hole 42a of the injection needle 42 is opened sideways, when the injection needle 42 is inserted into the spray material 2, the spray material 2 can be prevented from clogging the injection hole 42a. It has a structure that can suppress the problem that the injection of the organic solvent 5 from the hole 42a is hindered. The organic solvent 5 can be ejected from the injection hole 42a of the injection needle 42 by pushing the operation part 43 toward the solvent storage part 41, and an appropriate amount of the organic solvent 5 can be removed from the injection hole 42a by pulling up the operation part 43. Inhalation into the solvent container 41 is possible.

  As shown in FIG. 5, a specific method for removing the spray material 2 uses an injection jig 4 in which the organic solvent 5 is sucked into the solvent container 41 shown in FIG. 3, and the injection hole of the injection needle 42 is used. 42a is inserted so as to be at a predetermined injection position (adhesion interface T), and the operation part 43 is pushed in to inject the organic solvent 5. Here, in FIG. 5, only the injection needle 42 of the injection jig 4 is displayed, and the injection needle 42 is shown at each injection position. In addition, since this injection | pouring jig | tool 4 can be hand-held, this injection | pouring operation | work can be easily performed manually.

When the organic solvent 5 is injected, the base material surface layer 3 located at the adhesion interface T is decomposed and dissolved by the organic solvent 5, whereby the spray material 2 is peeled off from the base material 1, and further falls naturally. be able to. The spray material 2 that has fallen may be removed by an appropriate recovery means.
In addition, although the injection | pouring position of the organic solvent 5 is inject | poured with a predetermined | prescribed space | interval, for example in the location which has protrusions 1b, such as a volt | bolt, in the base material 1, it increases by increasing an injection | pouring location and making an injection | pouring interval small. The organic solvent 5 is allowed to penetrate over the entire bonding interface T.

In the removing method of the present embodiment, as shown in FIG. 5, since the organic solvent 5 having a peeling function is injected into the adhesive interface T, the adhesive or coating for the spraying material 2 interposed in the adhesive interface T The base material surface layer 3 made of the above coating film is decomposed and dissolved by a chemical reaction with the organic solvent 5, and the adhesion force to the base material surface 1a can be reduced. And, since the organic solvent 5 diffuses over the entire bonding interface T by allowing the injected organic solvent 5 to permeate along the bonding interface T of the base material 1, the spray material 2 is peeled off from the base material 1. When the spray material 2 is applied to the top surface or the side wall as in the present embodiment, it can be dropped naturally. At this time, since the base material surface layer 3 is dissolved by the organic solvent 5, the asbestos and rock wool of the spray material 2 are stuck on and adhered to the base material surface layer 3 and remain on the base material surface 1 a.
Therefore, even when the base material surface 1a has a complicated shape, or even when the base material surface 1a is provided with a projection such as a bolt (projection 1b shown in FIG. 5), the spraying material 2 Removal can be performed in a state in which there is no residue left.

  Moreover, since the spraying material 2 can be naturally dropped and removed only by injecting the organic solvent 5, for example, it is not necessary to use a dedicated removal device equipped with a complicated mechanism, and rough removal with a keren rod is possible. The time-consuming work of polishing after performing is also unnecessary. Thus, since a large removal apparatus is not used, even in a narrow work space, the removal work can be performed easily and in a short time.

In addition, a simple operation of inserting the injection needle 42 into the spraying material 2 and injecting the organic solvent 5 is sufficient, and asbestos and rock wool in the spraying material 2 are scattered during the operation of inserting the injection needle 42. There is an advantage that can be prevented.
Further, since the injection hole 42a of the injection needle 42 is provided in a direction orthogonal to the needle axis, the spray material 2 is clogged in the injection hole 42a when the injection needle 42 is inserted into the spray material 2. Can be prevented, and the problem that the injection of the organic solvent 5 from the injection hole 42a is hindered can be suppressed.

  As described above, in the method for removing the asbestos-containing spray material according to the present embodiment, the organic solvent 5 is injected into the adhesion interface T between the base material 1 and the spray material 2, and the organic solvent 5 sprays the spray material. It becomes possible to decompose the base material surface layer 3 (adhesive or coating) applied to the base material surface 1a to be the application surface to reduce the adhesive force, and the fibers contained in the spraying material 2 are used for the base material surface 1a. The spray material 2 can be reliably removed without remaining in a state of adhering to the surface.

As mentioned above, although embodiment of the removal method of the asbestos containing spraying material by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. .
For example, in this embodiment, a syringe-type injection jig 4 provided with a solvent container 41 is used, but the present invention is not limited to such a configuration. For example, a stationary container that can store the organic solvent 5 and an injection needle provided at the tip of an injection hose connected to the container, or a gun-type injection treatment It may be a tool.
Moreover, in the injection | pouring of the organic solvent 5 using an injection | pouring jig | tool, it is also possible to carry out the press injection which injects by applying a pressure with a pressure pump etc.

Furthermore, in the present embodiment, the position of the injection hole 42a of the injection needle 42 has an opening in a lateral direction perpendicular to the needle axis, but the present invention is not limited to this, and an injection needle having an opening in the needle axis direction is used. It does not matter.
In addition, the injection amount, injection position, injection interval, and the like of the organic solvent 5 can be appropriately set according to conditions such as the material of the spray material 2, the thickness dimension of the spray material 2, and the material of the base material 1. it can.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 base material 2 spraying material (asbestos-containing spraying material)
3 Substrate surface layer 4 Injection jig 5 Organic solvent 41 Solvent container 42 Injection needle (needle-shaped member)
42a Injection hole 43 Operation part T Adhesive interface

In order to achieve the above object, in the method for removing asbestos-containing spray material according to the present invention, the asbestos-containing spray material sprayed on the surface of the base material on which the adhesive or coating for spray material is applied. A method of removing a material, injecting an organic solvent having a dissolving function with respect to an adhesive or coating toward the vicinity of the adhesive interface with the base material of the asbestos-containing spray material, and introducing the organic solvent along the adhesive interface It is characterized by penetration.
Moreover, you may make it inject | pour the organic solvent which has a melt | dissolution function with respect to the said adhesive agent or coating using an injection jig.

Claims (2)

A method for removing an asbestos-containing spray material sprayed on a surface of a base material to which an adhesive for spraying material or a coating is applied,
Using an injection jig, an organic solvent having a dissolving function for the adhesive or coating is injected toward the vicinity of the adhesive interface with the base material of the asbestos-containing spray material, and the organic solvent is injected into the adhesive interface. A method for removing asbestos-containing spraying material, wherein the asbestos-containing spraying material is permeated along the surface. The injection jig has a needle-like member that can penetrate the asbestos-containing spray material,
An injection hole is provided at the tip of the needle-like member in a direction perpendicular to the needle axis,
The needle-like member is inserted into the asbestos-containing material spraying material, and the organic solvent is sprayed in a radial direction with respect to the needle axis through the injection hole in a state where the tip reaches the adhesion interface. The removal method of the asbestos containing spraying material of Claim 1.

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