JPH02237664A - Liquid injection nozzle device into asbestos layer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is used to suppress and remove asbestos layers that are sprayed on the ceilings and walls of school buildings, buildings, etc. for fireproofing and soundproofing purposes. The present invention relates to a nozzle device used to inject a liquid into a liquid.

[Prior art and problems to be solved by the invention] Asbestos is a fibrous mineral that has sound-insulating and heat-resistant effects, and has been widely used in building materials and automobile parts. It was discovered that continued inhalation could lead to lung cancer, so its use was discontinued, and in areas where asbestos-sprayed building materials (sprayed materials) are used for walls and ceilings, asbestos fibers are separated from the sprayed asbestos layer. There was a strong possibility that this would cause indoor contamination, and some kind of countermeasure was required.

Therefore, the current treatment methods for asbestos contamination include applying a special paint to the surface of the asbestos layer and holding it down to prevent asbestos fibers from scattering, enclosing the surface of the asbestos layer with sheets, boards, etc., and removing asbestos itself. There are known methods of removing this.

However, since the above-mentioned containment method allows scattered asbestos to float in the air, it cannot be said to be a complete means of preventing contamination.

Among the above-mentioned methods, the push-in method has attracted particular attention, and various methods have been proposed. For example, a method of diluting a mixture of vinyl-based water-soluble polymers, flame retardants, and preservatives with water and spraying the mixture onto the surface of the asbestos layer (
Dated February 18, 1988. Nikkei Sangyo Shimbun), a means of spraying paint based on acrylic copolymers (February 2, 2016, same newspaper), and other methods of spraying water-soluble resin or emulsion onto asbestos and hardening it, followed by flame-retardant paint. (dated November 27, 1987).
Nihon Keizai Shimbun) etc. are known.

In the above-mentioned holding down method, even if a specified liquid is simply sprayed onto the surface of the asbestos layer, if the fluidity of the fluid is low, it will not penetrate into the asbestos layer, and on the other hand, if the fluidity is high, it will not penetrate into the asbestos layer. In this case, the asbestos will flow down immediately, and the asbestos layer will not be penetrated effectively. Also, when removing asbestos layers, water or other fixatives are sprayed on the asbestos fibers in advance to prevent them from scattering during the removal process, but simply spraying only on the surface side will not have a penetration effect. Therefore, a method of injecting a liquid agent into the asbestos layer using an injection needle and allowing a predetermined liquid agent to penetrate into the asbestos layer is also considered. However, simply providing a liquid injection port at the tip or circumferential surface of the injection needle results in poor work efficiency and does not allow for uniform penetration of the liquid into the entire asbestos layer.

(Means for Solving the Problems) In view of the above problems, the present invention proposes a nozzle device that can efficiently infiltrate a liquid agent into an asbestos layer.

The nozzle device for injecting liquid into Asbes 1 and Calendar according to the present invention has a nozzle having a sharp tip and a large number of injection ports that surround the upper and lower positions as well as the left and right circumferential directions on the side circumferential surface. A plurality of nozzles are planted at predetermined intervals, and each nozzle is provided with a liquid agent pipe.

(Function) When the nozzle is inserted into the asbestos layer and the liquid agent is ejected from each injection port on the side peripheral surface of the nozzle, the liquid agent penetrates uniformly into the asbestos layer in a short time.

(Example) Next, examples of the present invention will be described.

The nozzle device according to the present invention consists of a base part and a nozzle part, and the base part includes a base 1, a liquid pipe 2, an on-off valve 3, a flow meter 4
, a handle 5, and a cover 6, a large number of nozzle parts are installed on the base 1 at suitable intervals, a liquid pipe 2 is provided to the nozzle part, and an on-off valve 3 and a flow meter 4 are installed in the pipe 2. and handle 5
is provided so that the entire device can be grasped, and the cover unit 6 exposes only the nozzle needle. The on-off valve 3 is a solenoid valve, and a switch 3l is attached near the handle 5.

The nozzle part' consists of a nozzle receiving nut 7, a nozzle needle 8, and a fixing bolt 9 provided on the substrate 1, and the nozzle receiving nut has a step formed at the bottom and a thread carved into the inner surface to connect the liquid pipe 2 described above. The nozzle needle 8
The tip is sharpened, and a plurality of injection ports 81 are provided on the side peripheral surface at different vertical positions and horizontal directions, and each injection direction is inclined toward the tip, and a seal member 8 is provided at the base end.
The fixing bolt 9 has an elongated hole through which the nozzle needle 8 passes, and has a screw screwed into the nozzle receiving nut 7 on its outer periphery. The nozzle needle 8 pushed into the nozzle receiving nut is equipped with a bolt head for rotating the locking bolt.
The sealing member 82 is strongly pressed against the stepped portion of the nut to prevent liquid leakage.

Next, a description will be given of an asbestos layer peeling operation using the nozzle device of the embodiment described in tm.

To remove the asbestos layer, some kind of method is needed to prevent the asbestos fibers from turning into dust and scattering into the air. Previously, water was sprayed from the outside, but the penetration of water into the asbestos layer was Unfortunately, the asbestos on the surface side that contains water becomes heavy and some parts of the asbestos peel off and fall. At the same time as the asbestos peels off, asbestos fibers are scattered into the air from the peeled surface. There is also a known method of injecting a resin material into the asbestos layer, solidifying it, and peeling it off. However, when a solidified asbestos lump falls and cracks, asbestos fibers are scattered from the cracked surface. Therefore, in the asbestos layer removal method using the nozzle device of the present invention, an aqueous solution of sodium polyacrylate (about 0.1 to 0.5%: 0.2% is optimal) is used as the injection liquid to the asbestos 1 layer. Prior to injection, the aqueous solution is sprayed onto the surface of the asbestos JILA in a dew pattern, and then, as shown in FIG. 5, the nozzle needle 8 is inserted into the asbestos layer A. The adhesive liquid is injected from the injection port 81 of No. 8, and the injection port 81 is composed of a large number of injection ports 81 that are thicker in the upper and lower positions on the side circumferential surface of the nozzle, as well as in the left and right directions. In addition to allowing the liquid to penetrate efficiently, the injection port 81 of the nozzle needle 8 is inclined toward the tip, so that the liquid to be injected quickly penetrates into the boundary between the wall surface and the asbestos NA. This loosens the adhesion of IilA to the wall surface and facilitates the removal of asbestos NA.

Moreover, since the liquid used is an adhesive, even if the asbestos layer becomes a lump and falls to the floor, there will be no scattering of asbestos fibers and no harm to the health of the workers. Sodium polyacrylate is used as a food additive and is extremely safe.

Further, the nozzle device of the present invention can be used not only in the above-mentioned asbestos removal method but also in an asbestos pressing method. The asbestos layer is pressed down by covering the surface side with a fireproof coating layer and integrating the inside of the asbestos layer with a resin material, and the injection liquid is, for example, a water-based epoxy resin. The nozzle device uses a nozzle needle 8, as shown in FIG. 6, which is different from the nozzle needle 8 used in the removal method described above, in which the injection needle opening 81 is not inclined and has a small number of injection openings. Therefore, as well as preventing the asbestos layer on the wall side from becoming too wet and peeling off from the wall surface, the resin is quickly injected into the asbestos layer A, similar to the removal method described above. Of course, the nozzle needle 8 is replaced as appropriate depending on the thickness of the asbestos layer A.

Furthermore, the nozzle device of the present invention is not limited to the above-mentioned embodiments, but as shown in FIG. It may have a shape that facilitates injection. The present invention is characterized by the position of the injection port of the nozzle needle, and the shape of the base part etc. can be arbitrarily determined depending on the number of nozzle needles installed.

(Effects of the Invention) As described above, the present invention provides a nozzle device for injecting a liquid into an asbestos layer, which is provided with a large number of nozzles each having a plurality of injection ports at different positions vertically and horizontally on the side circumferential surface. The present invention provides an efficient device for asbestos treatment method, which can uniformly and efficiently inject a liquid into an asbestos layer having a certain thickness.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention. FIG. 1 is a perspective view of the entire structure. FIG. 2 is a sectional view of a main part. FIG. 3 is an enlarged sectional view of a nozzle needle. FIG. 4 is a nozzle portion. A sectional view of FIG. 5 shows the state of use, FIG. 6 shows another example of the nozzle needle, and FIG. 7 shows an example of the nozzle installed at the corner part. 1 is the base 2 is the piping 3 is the on-off valve 4 is the flow meter 5, 5 is the handle 6 is the cover integrated 7 is the nozzle receiving nut 8, 8', 8''t, and the nozzle needle 9 is the stop bolt

Claims (1)

[Claims] (1) A plurality of nozzles each having a sharp tip and having a plurality of injection ports surrounding the upper and lower positions as well as the left and right circumferential directions on the side peripheral surface are planted at predetermined intervals on the base, and each of the nozzles is A nozzle device for injecting a liquid into an asbestos layer, characterized by being equipped with a liquid pipe.