JPH0469597B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is a fireproof covering material suitable for preventing asbestos already sprayed indoors from peeling off and scattering. Regarding asbestos scattering prevention method.

(Prior art) There was a time when asbestos spraying was widely used as a fireproof coating method for buildings, but it was discovered that the asbestos used in this spraying had a negative impact on the human body. Now that it has been confirmed, this type of asbestos spraying method has come to be strictly regulated.

However, at that time, spray-applied asbestos
As the years have passed, asbestos has already fallen off and scattered, and this scattered asbestos has caused extremely serious social problems, including the risk of inducing lung cancer among building users and surrounding residents. Therefore, as post-treatment methods for spray-applied asbestos, conventional methods include peeling off the asbestos that has adhered to it and then attaching mortar, etc., and methods that cover the surface of the spray-applied asbestos with a sheet. There are post-processing methods.

(Problems that the invention aims to solve) However, with the conventional method of attaching mortar etc. after removing asbestos, there are problems in ensuring the safety of workers during asbestos removal work and problems in the disposal of separated asbestos. Problems remain. In addition, asbestos removal work and mortar adhesion work to the peeled-off remains are required, which is a large-scale post-processing work, which inevitably increases construction costs.

On the other hand, an emergency post-treatment method in which the surface of spray-applied asbestos is covered with a sheet has a problem in that it lacks durability after treatment.

Moreover, the adhesion of asbestos that has already been sprayed varies depending on the material and age of the building being coated, so it is extremely difficult to use a uniform method for post-treatment of asbestos. It's becoming difficult.

The present invention was created in view of the above-mentioned problems, and is highly safe during work, can uniformly prevent the peeling and scattering of asbestos that has already been sprayed, and can also keep construction costs low. The purpose is to provide a construction method to prevent asbestos scattering.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention impregnates an aqueous binder solution into an asbestos coating layer sprayed for fire prevention and soundproofing of buildings. The solution to the problem consists of solidifying the coating and applying polymer cement to the entire surface of the solidified asbestos coating.

(Example) Examples of the present invention will be described in detail below.

The first step in the present invention is to impregnate an aqueous binder solution into an asbestos coating layer sprayed for fire prevention and soundproofing of buildings, solidify this coating layer, and enhance the adhesion of asbestos. . At this time, by using an aqueous binder solution consisting of an inorganic sol group, the asbestos coating layer after solidification will have high fire resistance. As the solution of the inorganic sol group, for example, a lithium silicate aqueous solution, a sodium silicate aqueous solution, etc. are planned to be used, but an aqueous solution of an inorganic sol group other than these may also be used.

It is also possible to use a polymer dispersion in the aqueous binder solution. However, at this time, it is necessary to use a polymer dispersion that has a certain degree of fire resistance.

In addition to methods such as spraying with a spray gun, coating with a brush, or injection, methods for impregnating and coating the asbestos coating layer with this aqueous binder solution include spraying with a spray gun, coating with a brush, or injection.
Any method is fine.

Next, as a second step, polymer cement (cement mixed with a polymer dispersion for cement admixture) is attached to the surface of the asbestos that has been solidified. The cement paste may be applied by, for example, spraying, brushing, or troweling. It is planned that the polymer cement will be applied to a thickness of about 2 mm to 3 mm, but this will be changed as appropriate depending on the state of asbestos adhesion.

As for the type of polymer dispersion, for example, resin emulsion such as polyacrylic acid ester or epoxy, or rubber latex such as styrene-butadiene rubber, etc. are planned. It shall be possible to choose.

In addition, in order to further strengthen the adhesion of polymer cement, we have added
It may be attached after applying a lath net or the like in advance. At this time, depending on the state of asbestos adhesion, the lath netting may be applied either before the asbestos is impregnated with the aqueous binder solution or after the asbestos has been solidified by the aqueous binder solution.

[Effect of the invention] The present invention provides the following steps by performing the steps described above.
Achieve the original purpose.

In other words, by impregnating the asbestos coating layer sprayed for fire and soundproofing purposes on buildings with an aqueous binder solution and solidifying this coating layer, the asbestos, which has become more likely to flake off and scatter over time, is re-integrated. solidified into Furthermore, even if the state of asbestos adhesion varies depending on the material and age of the building being coated, the aqueous binder solution will penetrate from the asbestos to the steel frame due to capillary action, so the asbestos and steel It can be firmly fixed to the

In addition, since the asbestos coating layer is impregnated with an aqueous binder solution and asbestos, which tends to dry and scatter, is fixed during post-treatment, the work is extremely safe.

Further, by applying the polymer cement to the entire surface of the solidified asbestos coating layer, the asbestos coating layer is further coated with a polymer cement having strong adhesive strength. As a result, the properties possessed by polymer cement, that is, remarkable bending strength, deformation resistance, impact resistance, etc., are imparted to the asbestos coating layer, resulting in extremely good durability after post-treatment.

Furthermore, the specific work of the present invention is completed by impregnating the asbestos coating layer with an aqueous binder solution and adhering polymer cement to the surface of the asbestos coating layer, so that asbestos removal work and mortar adhesion to the peeling traces are possible. It is easier to work than conventional construction methods that require additional work, and construction costs can be kept low.

As described above, the present invention provides industrial advantages such as high safety during work, uniform prevention of peeling and scattering of spray-applied asbestos, and lower construction costs. Have a beneficial effect.

Claims (1)

[Claims] 1. A step of impregnating an asbestos coating layer sprayed for fire prevention and soundproofing of buildings with an aqueous binder solution and solidifying the coating layer, and applying polymer cement to the entire surface of the solidified asbestos coating layer. An asbestos scattering prevention method characterized by comprising the step of attaching asbestos. 2. The asbestos scattering prevention method according to claim 1, wherein the binder aqueous solution is composed of an inorganic sol group. 3. The asbestos scattering prevention method according to claim 1, wherein the binder aqueous solution comprises a polymer dispersion.