JPH11121973A - Electromagnetic shielding structure of concrete skeleton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for countermeasures against effect on a shielding performance due to poor connection by surrounding a specified length from an electromagnetic wave-propagating aperture in the propagating direction with an electromagnetic wave shielding functional member in the case of making the aperture in a concrete skeleton face having no electromagnetic shielding functional member. SOLUTION: A concrete floor 1 is made in continuation to concrete beam 6 with erected concrete walls 2, and aluminum backed glass wool 5 is attached to their insides as a heat insulator, and a conductive film 10 continuously extends from the surfaces of room-inside wall plates 11 of plywood and the like for confining the glass wool 5 between the plates 11 and concrete walls 2. An exposed portion of the junction of the concrete wall 2 and floor 1 forms an electromagnetic wave propagating aperture 12 having no electromagnetic wave shielding functional member and specified length from this aperture 12 in the propagating direction is surrounded with the aluminum backing glass wool 5 having the electromagnetic wave shielding function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shielding structure for a building made of concrete for construction and civil engineering.

[0002]

2. Description of the Related Art The necessity of electromagnetic shielding of a building in a building is indispensable when a personal portable device to which radio technology is applied in a building is used indoors within a legally regulated frame. For security reasons, it is necessary to shield radio waves of the frequency, that is, to prevent radiation and intrusion.

In Japanese Patent Publication No. Hei 6-99972, as an electromagnetically shielded intelligent building, the building frame is made of concrete containing an electromagnetically shielded member, and communication is performed between communication facilities in the building using radio waves. In addition, there has been proposed an apparatus that enables communication using a wide frequency band.

Conventionally, as an electromagnetic shield of a building structure using such a building frame, a member having an electromagnetic shielding function such as a metal material such as an iron plate, a metal net, a metal foil or a metal mesh or a ferrite or the like is mounted on a concrete frame such as a floor or a wall. It is said that effective electromagnetic shielding can be performed by adding.

In a steel structure or a steel reinforced concrete structure, a deck plate 4 for forming a concrete floor 1 as shown in FIG. 4, an aluminum curtain wall, a precast curtain wall, and other concrete walls 2 and a ceiling 3 are provided. Aluminum-backed glass wool 5 or the like as a heat insulating material can be used as it is as a member having an electromagnetic shielding function. In the figure, reference numeral 11 denotes a wall plate as a base material for a wall on the indoor side such as a plywood or a plaster board, 6 denotes a concrete beam incorporating a beam steel structure 6a, and 6b denotes a beam steel structure forming a small beam.

[0006]

However, members having an electromagnetic shielding function, such as the deck plate 4 and the aluminum-backed glass wool 5, are all members of the concrete floor 1, concrete wall 2, concrete beam 6, etc. If not electrically connected, a gap portion related to the electromagnetic shield as shown by a circle is generated, and the electromagnetic shield may be incompletely processed.

Conventionally, regarding the gap portion related to the electromagnetic shielding, a metal plate such as an iron plate, a copper plate, an aluminum plate, a metal net,
Filled with a metal material such as metal foil or metal mesh or a member having an electromagnetic shielding function such as ferrite, and complete electrical connection is performed by welding etc., but it takes time and effort,
The cost was high. In particular, in the construction, the shielding performance is greatly affected by the connection method of the gap between the members having the electromagnetic shielding function, and the performance is greatly deteriorated even with some construction failure. Especially large effect of gap-connections in 1GH _Z or more radio wave wavelength becomes shorter.

FIG. 5 shows another conventional example in which conductive processing is performed. In addition to the aluminum backing glass wool 5, a conductive sheet 15 such as an aluminum foil is provided, and the conductive sheet 15 is placed on each layer. It is necessary to connect them without gaps and connect them to the deck plate 4.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to eliminate the influence on the shielding performance of the connection portion between the members and the need for consideration of the conductive treatment and grounding measures, thereby improving the workability and convenience of concrete. An object of the present invention is to provide an electromagnetic shielding structure of a building.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a concrete skeleton provided with a member having an electromagnetic shielding function, in which the surface of the concrete skeleton having no member having the electromagnetic shielding function is present. In the case of an electromagnetic wave propagation opening into the concrete body, a certain length in the direction of electromagnetic wave propagation from this opening was surrounded by a member having an electromagnetic shielding function. Second, the member having an electromagnetic shielding function was interposed with concrete. Third, superimposing a certain length,
When the concrete body is a concrete floor, one of the members having an electromagnetic shielding function is a deck plate, and the other is a conductive film that covers the inside surface of the concrete floor and the wall. Fourth, the parts are overlapped by a certain length with concrete interposed therebetween, and fourthly, the conductive film is formed by conductive paint or metal spraying.

According to the first aspect of the present invention, attention has been paid to the fact that concrete has a small electromagnetic shielding ability, and the surface of the concrete body where there is no member having the electromagnetic shielding function is exposed to electromagnetic waves into the concrete body. The required attenuation effect can be obtained by setting the aperture as a propagation aperture and propagating the electromagnetic wave, which is to enter the concrete and propagate therethrough, for a certain length.

According to the second aspect of the present invention, in addition to the above-mentioned functions, when the concrete frame has a large area such as a concrete floor, the entire structure is surrounded by a member having an electromagnetic shielding function. There is no necessity, and if a certain length is superimposed, the superimposed portion becomes a portion where the electromagnetic waves entering the concrete are about to propagate, and the required damping effect can be obtained.

According to the third aspect of the present invention, when one of the members having the electromagnetic shielding function is a deck plate,
When the other surface of the concrete is covered with another member having an electromagnetic shielding function, it can be simplified and streamlined by using a conductive film arranged from the indoor side, and the coating and wallpaper etc. It does not hinder the application of finishing materials.

According to the present invention, the conductive film can be easily formed by a conductive paint or metal spray.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing one embodiment of an electromagnetic shielding structure of a concrete skeleton according to the present invention, which is a case of a steel reinforced concrete building using a deck plate 4 as in FIGS. 4 and 5 showing the conventional example.

First, the principle of the present invention will be described with reference to FIG. 2. In FIG. 2, reference numeral 7 denotes a member having a first electromagnetic shielding function, 8 denotes a member having a second electromagnetic shielding function, and 9 denotes a plate-like concrete. Then, the lower surface and the upper surface of the concrete 9 are covered with the member 7 having the first electromagnetic shielding function and the member 8 having the second electromagnetic shielding function. The opening 12 is formed.

Although the concrete 9 has a large area, even if the member 7 having the first electromagnetic shielding function or the member 8 having the second electromagnetic shielding function cannot cover all of the surface of the concrete 9, Both are concrete 9
And the constant length L is superimposed.

The electromagnetic shielding ability of the concrete 9 is as follows.
For example, according to “Basics of Mobile Communication” edited by the Institute of Electronics, Information and Communication Engineers, 920 MHz 4.9 dB / 10 cm, 2,000
MHz is 10.9 dB / 10 cm.

Electromagnetic waves do not enter the concrete 9 from the surface having the member 7 having the first electromagnetic shielding function and the surface having the member 8 having the second electromagnetic shielding function. An opening 12 is formed, from which electromagnetic waves enter the concrete 9.

Electromagnetic waves propagating in the concrete 9 are gradually attenuated. If the fixed length L is 1.5 m, the electromagnetic waves are lost at a distance of 1.5 m, that is, 4.9 × 15 = 73.5 dB 920 MHz 10. An attenuation of 9 × 15 = 163.5 dB 2,000 MHz will be obtained.

In FIG. 1, concrete 9 is a constituent material of the concrete floor 1, and the one corresponding to the member 7 having the first electromagnetic shielding function is the deck plate 4 and the member 8 having the second electromagnetic shielding function. As an equivalent, a conductive film 10 is provided on the indoor side.

As the conductive film 10, for example, nickel powder pigment, acrylic resin, acrylic polyol resin,
An anti-settling agent, an aromatic-based, ester-based solvent as a base material, and a two-component polyurethane-based conductive paint using an aromatic-aliphatic mixed polyisocyanate resin, an aromatic-based solvent, and an ester-based solvent as a curing agent by brushing or It can be formed by spray painting.

As still another example, the conductive film 10 is formed by electroless nickel plating or electroless copper plating formed by melting a metal such as zinc, aluminum, copper, stainless steel, or molybdenum by an arc and spraying with air. It is possible to form.

Further, as this conductive film, an aluminum foil or another electromagnetic shielding material of a conventional method may be used.

The concrete floor 1 is continuous with the concrete beam 6, the concrete wall 2 rises, and the aluminum backing glass wool 5 as a heat insulating material is disposed inside the concrete wall 2, and the aluminum backing glass wool 5 is attached to the wall 2 The conductive film 10 is continuously provided from the surface of the wall plate 11 as a wall base material on the indoor side such as a plywood or a plaster board to be confined between the concrete floor 1 and the surface.

In this manner, the conductive film 10 is disposed so as to shield the space between the aluminum-backed glass wool 5 as a member having an electromagnetic shielding function and the deck plate 4 and constitutes the concrete floor 1. The deck plate 4 and the conductive film 10 overlap by a predetermined length L with concrete to be interposed therebetween.

As a result, the portion exposed to the outside at the joint between the concrete wall 2 and the concrete floor 1 becomes the electromagnetic wave propagation aperture 12 as a portion where no member having an electromagnetic shielding function is present, and the electromagnetic wave propagation opening 12 enters the concrete of the concrete floor 1 from here. Is attenuated while traveling a certain length L, and does not enter the room.

On the conductive film 10, a wallpaper or the like as a wall finishing material 13 or a vinylite or the like as a floor finishing material 14 for a concrete floor can be applied.

In the above embodiments, the electromagnetic shielding of the concrete floor portion using the deck plate or the connecting portion between the concrete floor and the concrete wall has been described. However, the present invention does not include a member having an electromagnetic shielding function such as a deck plate. The present invention is also applicable to a concrete skeleton of a reinforced concrete building. For example, as shown in FIG.
A conductive film 10 is provided on the outer surface of the concrete wall 2 including the joint with the aluminum wall-backed glass wool 5 and the conductive film 10 for a predetermined length L with concrete, which is a constituent material of the concrete wall 2, interposed therebetween. Is an example.

Further, if the structure is such that concrete is interposed and the periphery thereof is surrounded by a member having an electromagnetic shielding function,
The invention can be applied not only to architecture but also to structures such as civil engineering.

[0031]

As described above, the electromagnetic shielding structure for a concrete skeleton according to the present invention is a member having an electromagnetic shielding function provided alongside the concrete skeleton by actively using concrete as a substance capable of exhibiting an electromagnetic wave attenuation effect. No connection between them is required, and measures against the influence of poor connection on the shielding performance and conductive treatment and grounding measures are not required.
It is excellent in convenience.

[Brief description of the drawings]

FIG. 1 shows an electromagnetic shielding structure of a concrete body of the present invention.
It is a longitudinal side view which shows embodiment.

FIG. 2 is an explanatory view showing the principle of the electromagnetic shielding structure of the concrete body of the present invention.

FIG. 3 is a longitudinal sectional side view showing another embodiment of the electromagnetic shielding structure of the concrete body of the present invention.

FIG. 4 is an explanatory view showing an electromagnetic wave leakage point of a deck plate structure as a conventional example.

FIG. 5 is a vertical sectional side view showing a conventional electromagnetic shield construction example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Concrete floor 2 ... Concrete wall 3 ... Ceiling 4 ... Deck plate 5 ... Aluminum lining glass wool 6 ... Concrete beam 6a, 6b ... Beam steel 7 ... Member having the first electromagnetic shielding function 8 ... Second electromagnetic shielding function Member 9 having concrete 9a side surface 10 conductive film 11 wall plate 12 electromagnetic wave propagation opening 13 wall finishing material 14 floor finishing material 15 conductive sheet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Taka ▼ Shuichi 2-191-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Kazushi Yamanoue 1-chome Awaza, Nishi-ku, Osaka-shi, Osaka No. 3-15 Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Masaaki Sasada 1-24, Kotobukicho, Nishinomiya City, Hyogo Prefecture

Claims (4)

[Claims] In a concrete skeleton provided with a member having an electromagnetic shielding function, when a surface of the concrete skeleton where the member having an electromagnetic shielding function does not exist is used as an electromagnetic wave propagation opening into the concrete skeleton, electromagnetic wave propagation from the opening is performed. An electromagnetic shielding structure for a concrete skeleton, wherein a fixed length in a direction is surrounded by a member having an electromagnetic shielding function. 2. The electromagnetic shielding structure of a concrete skeleton according to claim 1, wherein the members having the electromagnetic shielding function are overlapped by a certain length with concrete interposed therebetween. 3. When the concrete body is a floor, one of the members having an electromagnetic shielding function is a deck plate, and the other is a conductive film covering the indoor surface of the floor and the wall. The electromagnetic shielding structure of a concrete skeleton according to claim 1, wherein the membranes overlap each other at a constant length with concrete interposed therebetween. 4. The electromagnetic shielding structure for a concrete body according to claim 3, wherein the conductive film is formed by conductive paint or metal spraying.