JPH0718221B2 - Electromagnetic shielding method by spraying method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic shielding method by a spraying method for efficiently constructing an electromagnetic shielding of a building.

[Conventional technology]

Generally, in intelligent buildings, information communication facilities such as complex electronic exchanges and computers are shared to perform information communication with the inside and outside of the building, but with the increasing sense of value for information, diversification of needs, and individualization The amount of information is increasing. Under such circumstances, how to transmit necessary information more quickly and at lower cost is a challenge for intelligent buildings. Information networks based on a data highway method using optical fiber cables or coaxial cables have been studied and proposed as solutions to such problems in intelligent buildings.

However, in the data highway method that uses optical fiber cables or coaxial cables, the optical fiber cables and coaxial cables must be stretched to every corner (each terminal device) in the intelligent building, and the construction cost required for cable laying And the construction period will be a problem.

Also, if radio waves are used for information communication, it is not necessary to lay cables, but in this case, up to 50 GHz will be regulated by the Radio Law on the one hand because noise radio waves will be emitted to the outside, and on the other hand, outside There is a problem that the system malfunctions due to radio waves from the TV, internal TV intermediate frequency, radio waves from the wireless microphone, and the like.

Therefore, the applicant of the present application has proposed various intelligent buildings that enable communication inside the building by radio waves by using an electromagnetic shielding material for the building and the openings such as windows and doorways to make the entire building an electromagnetic shielding structure. Is going. In this case, for example, for the frame, use concrete with ferrite or concrete with conductive kesch, and for windows and doorways, use glass with mesh or glass with conductive film attached to improve electromagnetic shielding performance of the entire building. Have secured.

[Problems to be solved by the invention]

However, the construction method in which a conductive material is put in concrete to secure electromagnetic shielding performance as described above cannot be applied to an existing building. Therefore, as a method of ensuring electromagnetic shielding performance for existing buildings, a method of using a sheet-shaped or panel-shaped material is conceivable.
It takes time and effort for joint processing and sticking processing, and also causes problems in performance and construction.

The present invention solves the above problems, and an object of the present invention is to provide an electromagnetic shielding method by a spraying method that can secure electromagnetic shielding performance with simple construction even in an existing building.

[Means for solving problems]

This is characterized in that a shield layer is formed on the wall surface of a normal building body of a building by mixing a short fiber shield material and a binder and spraying the mixture on the inside of the wall surface of the building.

[Action]

In the electromagnetic shielding method by the spraying method of the present invention, a mixture of a short fiber shield material and a binder is used as the spray material, so that the short fiber shield material is meshed to form a shield layer on the wall surface only by spraying. To be done. Therefore, the electromagnetic shielding of the outer peripheral portion excluding the window surface can be performed by a simple operation.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a diagram for explaining one embodiment of an electromagnetic shielding method by a spraying method according to the present invention, and FIG. 2 is a diagram for explaining another embodiment of an electromagnetic shielding method by a spraying method according to the present invention. Is. In the figure, 1 is a nozzle, 2 is a spraying device, 3 and 6 are shield layers, 4 is a wall, and 5 is a heat insulating layer.

The electromagnetic shielding method by the spraying method according to the present invention is to form a shield layer by mixing a short fiber shield material and a binder and spraying this on the inner wall surface. As the shield material, for example, carbon fiber with nickel ( Ni) or other metal coated can be used, and urethane can be used as the binder.

FIG. 1 shows a state in which the short fiber shield material and the binder are mixed and sprayed onto the inner wall. In FIG. 1, a spray material obtained by mixing a short fiber shield material and a binder is stored in a spray device 2 and sprayed from a nozzle 1 to an inner wall to form a shield layer 3. When the spray material is sprayed onto the inner wall by the nozzle 1 in this way, the shield material is bonded by the binder to form a mesh shape and the shield layer 3 is formed on the wall surface. Therefore, the electromagnetic shielding of the outer peripheral portion excluding the window surface can be easily performed.

Further, as one construction method for performing heat insulation of a building, there is a method in which a foam material obtained by inserting a foam material into urethane is sprayed. Therefore, as shown in FIG. 2 (a), if the heat insulating layer 5 and the shield layer 6 in which a foam material is put into urethane and foamed are overlapped, inner heat insulation and electromagnetic shielding can be performed simultaneously. That is, the shield layer 6 is formed by mixing a short fiber shield material and a binder (urethane) and spraying them without foaming, while the heat insulating layer 5 is formed by foaming and spraying the same binder. Further, a short fiber shield material may be mixed into the heat insulating layer 5'to use the heat insulating layer 5'as a shield layer.

〔The invention's effect〕

As is clear from the above description, according to the present invention, since the shield layer is formed by spraying, the shield layer joint process becomes unnecessary. Further, since the work is performed on the inner wall side, an external scaffold is not required and the construction is easy.
Further, since the shield layer can be formed simultaneously with the internal heat insulation by applying the shield layer, the following various effects can be expected. That is, the heat insulating material is required in almost the same part as the part requiring the shield, and since the finish of the inner wall that is usually performed after the inner heat insulating construction can be replaced by the shield blowing,
Economical with no need for new finishing. In general, the shield material has a good heat transfer property, and thus by spraying the shield material so as to form a layer with the heat insulating material, the heat bridge can be prevented without impairing the heat insulating property. Since the heat insulating material is weak in strength, but the shield material is strong in strength, it is possible to reinforce the heat insulating material by the shield layer by spraying so as to form a layer with the heat insulating material.

[Brief description of drawings]

FIG. 1 is a diagram for explaining one embodiment of an electromagnetic shielding method by a spraying method according to the present invention, and FIG. 2 is a diagram for explaining another embodiment of an electromagnetic shielding method by a spraying method according to the present invention. Is. 1 ... Nozzle, 2 ... Spraying device, 3 and 6 ... Shield layer, 4 is a wall, 5 ... Thermal insulation layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H05K 9/00 M (72) Inventor Hiromichi Tomioka 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Within the construction company (72) Inventor Yoshinori Nishiyama 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hitoshi Sakurai 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu-ken Incorporated Co., Ltd. (72) Inventor Yoshifumi Ito 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Ken Co., Ltd. (56) Reference JP-A-58-187467 (JP, A) JP-A-56-41963 (JP, A)

Claims (3)

[Claims] 1. A spraying method characterized in that a shield layer is formed on the wall surface of a normal building frame by mixing a short fiber shield material and a binder and spraying the mixture on the inside wall surface of the building. Electromagnetic shielding method. 2. The electromagnetic shielding method according to claim 1, wherein the short fiber shield material is a carbon fiber coated with a metal. 3. An electromagnetic shielding method by a spraying method according to claim 1 or 2, wherein a non-foamed shield layer and a heat insulating layer in which the same binder is foamed are overlapped and sprayed.