JP5348564B2 - Removing asbestos-containing material - Google Patents

Description

  The present invention relates to a method for removing an asbestos-containing material coated by spraying or the like as a fireproof material for a hollow fireproof double wall.

Conventionally, a hollow double refractory wall may be used for structures, such as a fireproof partition of the core part of a building. As a structure of such a hollow double fireproof wall, generally, a lightweight steel frame is set up, a lath net is stretched on both sides thereof, and a wet fireproof coating material is sprayed from the outer surface side of the lath net. ing. Some fireproof coating materials are constructed using sprayed asbestos material, sprayed rock wool containing asbestos, or the like.
In general, as a method for removing asbestos-containing materials, after roughing with a tool such as a keren rod, for example, a brush or the like is used to scrape off and polish the residual deposits mainly composed of cement components. Further, as a removal method with improved work efficiency compared with the case of human power, a method using a removal device or the like is disclosed in Patent Documents 1 and 2, for example.

  Patent Document 1 is provided with a brush and a scraper that are appropriately driven in a bucket provided at the tip of a manipulator, and the brush and the scraper are operated and peeled in the state in which the opening of the bucket is pressed against the asbestos surface. It describes an apparatus for processing by dropping asbestos into a bucket as it is and transferring it from the bucket to a processing container or the like.

  In Patent Document 2, a cut brush (peeling means) for peeling the asbestos-containing material, an inner hood that surrounds the peeling means, an outer hood that surrounds the inner hood, and a treatment tank for removing the asbestos-containing material from the inner hood. An asbestos removing device having a suction means for sucking into the air is disclosed.

JP-A-8-199832 JP 2008-253857 A

However, in the asbestos removal method using the asbestos removal apparatus as shown in Patent Documents 1 and 2, the asbestos-containing material is used in a hollow double fireproof wall in which an asbestos-containing fireproof coating material is sprayed on a lath net. It will remain in the lath net after removal. In that case, the remaining residual deposit is scraped off using a metal scourer, etc., but there is a problem that it takes enormous time and labor to remove all the asbestos-containing material adhering to the fine net. there were.
Furthermore, the lath net has a problem that even when it is roughly dropped, unlike the steel frame, deck, concrete, etc., the base material of the asbestos spray material is difficult to apply the scraper method.

  The present invention has been made in view of the above-described problems, and can provide a method for removing an asbestos-containing material that can reduce the labor and time required for the removal work and can reliably remove the asbestos-containing material. The purpose is to do.

  In order to achieve the above object, the method for removing an asbestos-containing material according to the present invention is a method for removing an asbestos-containing material in a hollow double wall covered with an asbestos-containing material from both sides of a mesh member arranged at a predetermined interval. A step of disposing an injection head in the hollow portion of the hollow double wall with a plurality of injection holes on the peripheral surface and allowing the acid liquid to be injected in almost all directions; And a step of adhering to the joint surface between the mesh member and the asbestos-containing material.

  In the present invention, the jet head is disposed in the hollow portion of the hollow double wall, and the acidic liquid is jetted in almost all directions from the jet head through a plurality of jet holes provided in the jet head. Spray onto the joint surface with asbestos-containing material. By repeating such an operation on the hollow double wall, the acidic liquid is uniformly attached to a predetermined range of the joint surface. Since the asbestos-containing material to which the acidic liquid is adhered is decomposed and dissolved by the chemical reaction between the cement and the organic substance by the acid, the asbestos-containing material can be peeled off at the joint surface with the mesh member and allowed to fall naturally.

  In the method for removing an asbestos-containing material according to the present invention, the acidic liquid may be ejected while rotating the ejection head.

  In the present invention, after the ejection head is disposed in the hollow portion of the hollow double wall, the acidic liquid is directed from the ejection head in almost all directions from the plurality of ejection holes provided on the peripheral surface while rotating the ejection head. It sprays and it sprays on the joint surface of a net-like member and an asbestos containing material. By rotating the ejection head in this way, the acidic liquid can be sprayed uniformly in all directions, and the acidic liquid can be sprayed more reliably on the asbestos-containing material.

  According to the asbestos-containing material removal method of the present invention, the asbestos-containing material is dissolved and peeled off by attaching an acidic liquid to the joint portion between the asbestos-containing material and the net-like member from the hollow portion side of the hollow double wall. Can be made. Therefore, even if it is a net-like member that is difficult to scrape off manually, the asbestos-containing material can be securely removed without leaving any deposits, and the remaining deposits can be removed with a brush or the like. Subsequent work such as dropping is also unnecessary, so that the removal work can be performed easily and in a short time without trouble.

It is a figure for demonstrating schematic structure of the removal method of the asbestos containing material by embodiment of this invention. It is a perspective view which shows the other structure of an ejection head.

  Hereinafter, the removal method of the asbestos containing material by embodiment of this invention is demonstrated based on drawing.

As shown in FIG. 1, the asbestos-containing material removal method according to the present embodiment uses a hollow double fireproof wall (hereinafter simply referred to as “hollow double wall 1”) that is used in a structure such as a fireproof partition in the core of a building. The method is applied to the construction for removing the asbestos-containing material coated by spraying.
Here, the hollow double wall 1 has lightweight steel frames 11 having a substantially U-shaped cross section standing at predetermined intervals along the wall surface direction, and lath nets 12 (network members) are stretched on both sides of the wall surface. Further, a wet fireproof coating material (hereinafter referred to as asbestos-containing material 13) is sprayed from the outer surface side of the lath net 12 at a predetermined thickness, and a hollow portion R is formed between the lath nets 12 and 12. ing. As the asbestos-containing material 13 containing asbestos, sprayed asbestos material, asbestos-containing sprayed rock wool, or the like is used.

  The asbestos-containing material 13 is removed by placing the injection head 20 of the hand-held injection jig 2 into the hollow portion R of the hollow double wall 1 and injecting the acidic liquid T from the injection head 20 to form a lath net. A method of causing the asbestos-containing material 13 to fall naturally from the lath net 12 by causing the asbestos-containing material 13 to react with the acidic liquid T and dissolving it. It has become.

  Here, examples of the acidic liquid T injected toward the bonding surface 13a of the asbestos-containing material 13 include mineral acids such as hydrochloric acid and organic acid aqueous solutions such as acetic acid and citric acid. The acidic liquid T has an action of reacting with and dissolving the asbestos-containing material 13, and separating the lath net 12 by peeling off the lath net 12 by being injected onto the bonding surface 13 a of the asbestos-containing material 13. For example, the PH value is adjusted to about 1 to 4 according to the conditions such as the material of the asbestos-containing material 13, the sprayed thickness dimension, the material of the lath net 12, and the like.

  The injection jig 2 for injecting the acidic liquid T toward the asbestos-containing material 13 can suck an appropriate amount of the acidic liquid T, and includes a gun body 21, a support rod 22 extended from the gun body 21, The ejection head 20 is provided at the tip 22 a of the support rod 22.

The gun body 21 is connected to a chemical tank 24 for storing the acidic liquid T by a liquid feed pipe 23, and operates a pressure feed pump 25 connected to the liquid feed pipe 23 by operating the operation unit 21 a, thereby causing the chemical tank 24 to operate. The acidic liquid T inside is sent out to the ejection head 20 side.
The support rod 22 has a flow path inside, and communicates with the liquid feed tube 23 via the gun body 21. And the front-end | tip part 22a of the support bar 22 has branched in T shape, and is connected with the inner space part of hemispherical head 20A, 20B of the ejection head mentioned later, respectively.

  In the ejection head 20, a pair of hollow hemispherical hemispherical heads 20 </ b> A and 20 </ b> B are arranged with their respective planes spaced apart from each other, and a tip 22 a of a support rod 22 is connected to both. A plurality of injection holes 20b, 20b,... Are provided in the spherical surface 20a of each hemispherical head 20A, 20B. These injection holes 20b communicate with the flow path of the acidic liquid T in the hemispherical head 20A, and are configured to inject the acidic liquid T delivered from the gun body 21 in almost all directions. That is, in the ejection head 20 according to the present embodiment, a plurality of ejection holes 20b are provided over the entire spherical surface 20a of the pair of hemispherical heads 20A and 20B, and the direction of about 360 degrees (substantially approximately) by both hemispherical heads 20A and 20B. The acidic liquid T can be jetted in all directions.

Next, the method for removing the asbestos-containing material 13 will be described more specifically based on the drawings.
First, as shown in FIG. 1, for example, a scattering inhibitor such as Astector S (registered trademark) is sprayed on the outer surface 13 b of the asbestos-containing material 13 to be removed. Then, using the injection jig 2 connected to the chemical tank 24, the injection head 20 is inserted through the asbestos-containing material 13 from the outer surface 13b side of the hollow double wall 1, and the pair of hemispherical heads 20A and 20B are hollow. Arranged in part R. And the operation part 21a of the injection jig 2 is operated, the acidic liquid T is injected from the injection head 20 toward the direction of about 360 degrees (substantially all directions) from the plurality of injection holes 20b, and the lath net 12 and the asbestos-containing material 13 is sprayed onto the joint surface 13a. Here, the symbol T ′ shown in FIG. 1 indicates the acidic liquid adhering to the joint surface 13a.
In addition, based on the ejection range by the ejection head 20, the above-described operation is repeatedly performed so that the acidic liquid T is uniformly attached to the joint surface 13a.

As a result, the asbestos-containing material 13 to which the acidic liquid T adheres is decomposed and dissolved by the chemical reaction between the cement and the organic matter by the acid, so that the asbestos-containing material 13 is peeled off at the joint surface 13a with the lath net 12. Can be dropped naturally. And the fallen asbestos containing material 13 should just be removed by a suitable collection | recovery means.
In addition, in this Embodiment, since the scattering inhibitor is beforehand sprayed on the outer surface 13b of the asbestos-containing material 13, scattering of asbestos that occurs when the asbestos-containing material 13 peels and falls can be suppressed.

As described above, in the method for removing asbestos-containing material according to the present embodiment, the acidic liquid T is attached to the joint portion 13a between the asbestos-containing material 13 and the lath net 12 from the hollow portion R side of the hollow double wall 1. The asbestos-containing material 13 can be dissolved and peeled off.
Therefore, even the lath net 12 having a shape that is difficult to scrape off manually can be removed by assuring the asbestos-containing material 13 without leaving any residue, and the residual deposits can be removed with a brush or the like. Subsequent work such as chopping off is not necessary, so that the removal work can be performed easily and in a short time without trouble.

  As mentioned above, although embodiment of the removal method of the asbestos containing material by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

For example, in the present embodiment, the jet jig 2 is configured to have a pair of hemispherical heads 20A and 20B at the tip, but is not limited to such a jet head. . That is, the ejection head 30 having another configuration shown in FIG. 2 has a hollow cylindrical shape that is provided coaxially on the support rod 31 via the rotating portion 32 and is rotatable about the central axis in the direction of arrow E. None, a plurality of injection holes 30a, 30a,... For injecting the acidic liquid T are provided. In this case, after the ejection head 30 is disposed in the hollow portion R of the hollow double wall 1 shown in FIG. 1, the acidic liquid T is substantially removed from the plurality of ejection holes 30 a while the ejection head 30 is rotated by the rotation portion 32. The acid liquid T can be adhered to the joint surface 13a of the asbestos-containing material 13 by spraying in all directions.
By rotating the ejection head 30 in this manner, the acidic liquid T can be sprayed uniformly in all directions, and the acidic liquid T can be sprayed onto the asbestos-containing material 13 more reliably.
Moreover, if the injection hole 30a can be provided so as not to be biased, it is not necessary to rotate.

Moreover, about the structure of the gun main body 21 of the injection jig 2, the support rod 22, the transport means (the liquid feed pipe 23, the chemical tank 24, the pressure feed pump 25), etc. of the acidic liquid T, it can change suitably.
Furthermore, in this Embodiment, although a hollow double fireproof wall is made into object as a hollow double wall, it is not restrict | limited to being a fireproof wall. Further, the component member of the hollow double wall is not limited to the present embodiment. For example, in the present embodiment, the lath net 12 is used, but a hollow double wall using another net member may be used. .
Furthermore, the kind, the amount of adhesion, etc. of the acidic liquid T may be appropriately set according to the conditions such as the material of the asbestos-containing material 13, the thickness dimension, the material of the mesh member 12, and the like.

1 hollow double wall 2 injection jig 12 lath net (net-like member)
13 Asbestos-containing material 13a Bonding surface 21 Gun body 20, 30 Injection head 20A, 20B Hemispherical head 20b, 30a Injection hole R Hollow part T, T 'Acidic liquid

Claims (2)

A method for removing an asbestos-containing material in a hollow double wall in which an asbestos-containing material is coated from both sides of a mesh member arranged at a predetermined interval,
A step of disposing an injection head in which a plurality of injection holes are provided on a peripheral surface and acid liquid can be injected in almost all directions, and disposed in a hollow portion of the hollow double wall;
A step of injecting an acidic liquid from the injection hole and attaching the acid liquid to a bonding surface of the mesh member and the asbestos-containing material;
A method for removing asbestos-containing material, comprising:   The method for removing an asbestos-containing material according to claim 1, wherein the acidic liquid is ejected while rotating the ejection head.

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