JPH0983180A - Electromagnetic shielding method - Google Patents

Abstract

(57) [Abstract] [Problem] To perform electromagnetic shielding with low cost and simple construction. A method of constructing an electromagnetically shielded space by using a fireproof wall 5 formed by spraying a fireproof material 10 on both sides of a metal lath 9 to cover the entire interior space R of a building with an electromagnetic shield material and electrically connecting them. Then, after removing the refractory material of the refractory wall, the upper end of the metal lath is electrically connected to the electromagnetic shielding material 4 of the ceiling slab by the metal foil, and the lower end of the metal lath is electrically connected to the electromagnetic shielding material 15 of the floor. After that, spray the refractory material on the metal lath.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of constructing an independent electromagnetic shielded space in a building structure such as an office building.

[0002]

2. Description of the Related Art Nowadays, in many office buildings, LANs and other communication lines are used to construct their own communication information processing systems. When such a system becomes large-scale, securing a communication line becomes a problem, and the wiring of cables becomes complicated, and when the room or the device is rearranged, the amount of work for changing the wiring becomes large. Therefore, the adoption of a wireless communication system using radio waves is also attracting attention as one method.

[0003] However, when a radio communication system using radio waves is adopted, regulations of the Radio Law regarding the frequency band to be used pose a problem. Therefore, in order to freely select and set the frequency band to use and adopt a unique wireless communication method without being restricted by the Radio Law, the space inside the building was electromagnetically shielded from the outside. Construction of an electromagnetic shielding building is indispensable. The applicant has already described such an electromagnetically shielded building in, for example, Japanese Patent Publication No. 6-99972, Japanese Patent Publication No. 6-99973, Japanese Patent Publication No. 7-16118, and Japanese Patent Publication No. 6-76706. Proposed outer wall shielding structure, Japanese Patent Publication No. 6-99971, Japanese Patent Publication No. 6-33699, Japanese Patent Publication No. 6-13822.
Japanese Patent Publication No. 6-63407, Japanese Patent Publication No. 5-79790, and Japanese Patent Publication No. 3-58557 propose a window opening shielding structure. Further, Japanese Patent Publication No. 3-62320, Japanese Patent Publication No. 3-45972, and Japanese Patent Publication No. 3-623.
No. 18, Japanese Patent Publication No. 5-34159 proposes a ceiling and a shielding structure for each layer.

As seen in these proposals, the electromagnetic shielding building uses an electromagnetic shielding material for a frame and a wall structure, and also uses an electromagnetic shielding material for openings such as windows and entrances along the outer wall of the building. By covering the entire surface with electromagnetic shielding material,
The space in the building can be configured as one electromagnetic shield space independent of the outside. Further, instead of using one electromagnetic shielded space in the building, the floors and ceilings on each floor are separated by electromagnetic shields, or the walls between rooms are separated by electromagnetic shields on each floor. Alternatively, a plurality of independent electromagnetic shielded spaces can be configured for each room.

[0005]

However, since the above-mentioned conventional electromagnetic shielding technology is mainly applied to a newly built building, an existing building having no electromagnetic shielding performance is used as an electromagnetic shielding building. , When building an independent electromagnetic shielded space for each floor or each room (hereinafter referred to as "renewal"), the frame or mist,
Since the structure of the building such as walls and slabs must be put into the hands, the construction work becomes large and it is not realistic in terms of cost and construction period. Therefore, in the case of renewal, new measures for constructing the electromagnetically shielded space are required.

[0006] The present invention is to solve the above problems, and an object of the present invention is to provide an electromagnetic shielding method capable of performing electromagnetic shielding with low cost and simple construction, as a part of such renewal measures. And

[0007]

Therefore, in the electromagnetic shielding method of the present invention, a fireproof wall formed by spraying a refractory material on both sides of a metal lath is used to cover the entire interior space of the building with the electromagnetic shield material and electrically A method of constructing an electromagnetically shielded space by connecting to the above, after peeling off the refractory material of the refractory wall, the upper end of the metal lath is electrically connected to the electromagnetic shield material of the ceiling slab with a metal foil, and the lower end of the metal lath is It is characterized by spraying a refractory material on the metal lath after being electrically connected to the electromagnetic shielding material of the floor.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining the electromagnetic shielding method of the present invention. The ceiling slab 1 and the floor slab 2 are constructed by placing concrete using a deck plate 4 made of a steel plate as a formwork.

Inside the building, a fireproof wall 5 for partitioning the living room space R and the corridor P is provided between the beam 6 and the skirting board 7. Around the beam 6, a fireproof coating 8 sprayed with a fireproof material such as rock wool is applied. The refractory wall 5 is formed by spraying a refractory material 10 such as rock wool, mortar, plaster on both sides of the metal lath 9.

The ceiling slab 1, the floor slab 2, the outer wall 3, the fireproof wall 5, and the window glass 11 constitute an existing skeleton having no electromagnetic shielding performance, and the living room space R surrounded by these is electromagnetically shielded. In order to make it a space, by renewal,
The electromagnetic shield 12 is provided inside the outer wall 3, and the electromagnetic shield 13 is provided inside the glass window 11. Each electromagnetic shielding material 12, 13
Is formed by applying a metal mesh, a metal foil, a sheet using conductive fibers, or applying a conductive paint.

Regarding the floor, the existing tile carpet 1
After peeling off 4, the electromagnetic shielding material 15 such as a metal mesh is laid, and then the mortar is further applied so that the metal mesh 15 is embedded in the mortar layer 16.
The floor, the outer wall 3, the electromagnetic shielding materials 15, 12, 13 of the window 11 and the deck plate 4 of the ceiling slab 1 are electrically connected.

After removing the refractory material 10 from the fireproof wall 5, the upper end of the metal lath 9 is covered with a metal foil or a metal mesh 17.
After that, the lower end of the metal lath 9 is electrically connected to the metal mesh 15 of the floor on the skirting board 7, and then the refractory material 10 is sprayed on the metal lath 9. Thereby, the ceiling, the floor, and all the six walls of the surrounding walls can be covered with the electromagnetic shielding material to construct the electromagnetic shielding space R independent from the outside.

The present invention is not limited to the above example, and various modifications can be made. For example, in the above example, the case where an existing building having no electromagnetic shielding performance is renewed as an electromagnetic shielding building has been described, but a newly constructed building may be similarly configured. When the deck plate 4 is not used for the ceiling slab 1, an electromagnetic shielding material such as a metal mesh, a metal foil, a conductive fiber sheet, and a conductive paint may be provided on the lower surface of the ceiling slab 1. .

As is clear from the above description, according to the present invention, since the metal lath in the fireproof wall is used as the electromagnetic shielding material, the electromagnetic shielding can be performed at low cost and with simple construction. Further, if the deck plate of the ceiling slab is used as the electromagnetic shielding material, the electromagnetic shielding can be performed with a lower cost and simple construction.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining an electromagnetic shielding method of the present invention.

[Explanation of symbols]

1 ... Ceiling slab, 2 ... Floor slab, 3 ... Outer wall, 4 ... Deck plate, 5 ... Fireproof wall 9 ... Metal lath, 10 ... Fireproof material, 17 ... Metal foil or metal mesh R ... Internal space

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hitoshi Sakurai 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Sumio Mukai 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction (72) Inventor Koji Nagata 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tadahiko Suzuki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (2)

[Claims] 1. A method of constructing an electromagnetically shielded space by constructing an electromagnetically shielded space by using a fireproof wall formed by spraying a fireproof material on both sides of a metal lath to cover the entire interior space of a building with an electromagnetic shield material and electrically connecting them. After peeling off the refractory material of the refractory wall, the upper end of the metal lath is electrically connected to the electromagnetic shielding material of the ceiling slab by the metal foil, and the lower end of the metal lath is electrically connected to the electromagnetic shielding material of the floor, and then on the metal lath. An electromagnetic shielding method characterized by spraying a refractory material on. 2. The electromagnetic shielding method according to claim 1, wherein the electromagnetic shielding material of the ceiling slab is a deck plate.