JPH10303592A - Execution method of butting part of wall and floor of electromagnetically shielded building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electromagnetic shielding performance from decreasing due to an opening being formed at the electromagnetic shielding layer of the butting part of the wall and floor of an electromagnetically shielded building. SOLUTION: In an electromagnetically shielded building for constituting an electromagnetically shielded space, by performing electromagnetic shielding on a surrounding wall 1 and one surface of slabs 2 and 3 using electromagnetically shielded materials 4-7, 11-14, and 21-24, an attenuation section with at least a specific length using electromagnetic shielding materials 4, 5, 13, 14, 22, and 24 is provided on both surfaces for the opening of the electromagnetic shielding layer being formed at the butting part between the slabs 2 and 3 and the walls 1, 8, and 9. An attenuation section us provided on a partitioning wall being connected to the slabs or is provided at a slab in contact with the wall, thus reflecting an electronic wave repeatedly and hence absorbing and attenuating it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shielding building which forms an electromagnetic shielding space by performing electromagnetic shielding on a surrounding wall and a lower surface of a slab using an electromagnetic shielding material.
The present invention relates to a floor butt joint construction method.

[0002]

2. Description of the Related Art When a radio communication system using radio waves is adopted, regulations of the Radio Law regarding the used frequency band 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 disclosed such an electromagnetic shielding building, for example, in Japanese Patent Publication No. 6-99972 and Japanese Patent Publication No.
Japanese Patent Publication No. 9973, Japanese Patent Publication No. 7-16118, and Japanese Patent Publication No. 6-76706 propose a shielding structure of a building frame and an outer wall. Japanese Patent Publication No. Hei 6-13822 discloses a structure for shielding the entrance and exit of a building.
407, Japanese Patent Publication No. 5-79790, Japanese Patent Publication No. 3
Japanese Patent Application Laid-Open No. 58557/1999 proposes a shielding structure for a window opening. Further, Japanese Patent Publication No. 3-62320, Japanese Patent Publication No. 3-44972, Japanese Patent Publication No. 3-62318, and Japanese Patent Publication No. 5-34159 propose a ceiling and a shielding structure for each layer.

FIG. 2 is a diagram showing an outline of the configuration of an electromagnetic shielding building, where 30 is a ceiling, 40 is a wall, 50 is a window, and 60 is a floor. In FIG. 2, a wall 40 is, for example, a metal mesh, a metal foil (film), a nonwoven fabric, a sheet using conductive fibers, or the like, or a conductive paint applied to form an electromagnetic shielding layer on the inner wall of the body. Alternatively, a board having such an electromagnetic shielding layer formed on one side is used. Ceiling 3
The floor 0 and the floor 60 are constructed in the same manner as the wall 40 or using a panel to which an electromagnetic shielding material is attached. Window 5
0 forms an electromagnetic shielding film using an electromagnetic shielding material on one or both surfaces of the window glass in the same manner as described above, and connects the electromagnetic shielding film to the sash frame, thereby forming the electromagnetic shielding layer of the wall 40 and the window 50. They are electrically connected integrally.

As seen in the above proposals, electromagnetically shielded buildings use an electromagnetically shielding material for a frame or a wall structure, and also use an electromagnetically shielding material for windows, entrances, and other openings along the outer wall of the building. By covering the entire surface with an electromagnetic shielding material,
The space inside the building can be configured as one electromagnetic shielding space independent from the outside. In addition, the interior of the building is not limited to one electromagnetic shielding space, but each floor is separated by an electromagnetic shielding material on the upper and lower ceilings and floors, or by partitioning walls between rooms on each floor with an electromagnetic shielding material. Alternatively, a plurality of independent electromagnetic shielding spaces can be formed for each room.

[0005]

However, when electromagnetic shielding is performed using an electromagnetic shielding material on one side of a slab or inside a wall, if there is a wall / floor abutting portion between the slab and the wall, the abutting portion is used. In this case, a gap or an opening is formed in the electromagnetic shielding layer, and a radio wave leaks, so that there is a problem that high-level electromagnetic shielding cannot be realized. That is, FIG. 3 is a diagram for explaining a reduction in shielding performance due to the opening of the electromagnetic shielding layer generated at the butt portion between the slab and the wall. As shown here, if there is a partition wall 80 that butt against the slab 70,
When electromagnetic shielding of the slab 70 is performed by the electromagnetic shielding material 90, there is a problem that an opening is formed on the electromagnetic shielding surface and electromagnetic shielding performance is reduced.

For example, when an electromagnetic shielding is to be performed on the lower surface of the slab 70, in the case of a new construction, the shielding is performed using a steel foam also serving as a floor form and a buried steel plate form for a beam. In the case of (1), electromagnetic shielding is performed using an electromagnetic shielding material such as a metal mesh, copper foil, conductive paint, or conductive cloth. However, electromagnetic shielding of the partition wall cross section cannot be performed by itself. This problem arises when electromagnetic shielding is performed on the upper surface of the slab 70 or when the slab 7
The same applies to the case where the operation is performed only on the upper surface or the lower surface of 0.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to prevent a decrease in electromagnetic shielding performance due to an opening formed in an electromagnetic shielding layer at a wall / floor abutting portion of an electromagnetic shielding building. is there.

Therefore, the present invention provides an electromagnetic shielding building which forms an electromagnetic shielding space by performing electromagnetic shielding on one side of a surrounding wall and a slab using an electromagnetic shielding material, and an electromagnetic shielding layer formed at a butt portion between the slab and the wall. Characterized in that an attenuation section having a predetermined length or more using an electromagnetic shielding material is provided on both sides with respect to the opening of the slab, wherein the attenuation section is provided on a partition wall connected to the slab, or the slab abuts against the wall. It is characterized by being provided in.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a method for constructing a wall / floor butt portion of an electromagnetic shielding building according to the present invention, wherein 1 is a wall, 2 and 3 are slabs, 4 to 7, 11 to 14,
21 to 24 are electromagnetic shielding materials, 8 is a beam, and 9 is a partition wall.

In FIG. 1A, an electromagnetic shielding space is composed of an electromagnetic shielding material 6 inside the wall 1, an electromagnetic shielding material 4 provided on the upper surface of the upper slab 2, and an electromagnetic shielding material provided on the upper surface of the lower slab 3. It is configured to be covered by the shielding material 7 and electromagnetically shielded from the upper and lower floors and the outer space of the wall 1. In this case, the butt between the slab 2 and the wall 1, that is, the upper surface of the upper slab 2 An opening is formed in the cross section of the slab 2 between the electromagnetic shielding layer provided by the provided electromagnetic shielding material 4 and the electromagnetic shielding layer provided by the electromagnetic shielding material 6 inside the wall 1, and only these electromagnetic shielding materials 4, 6, 7 are provided. In this case, there is a problem that the shielding performance is reduced due to radio wave leakage from this portion. Therefore, in the upper slab 2, the electromagnetic shielding member 5 having a predetermined length L is provided on the lower surface thereof, so that the electromagnetic wave attenuating section in which the electromagnetic wave is repeatedly reflected and absorbed / attenuated between the electromagnetic shielding members 4 and 5 is provided. Has formed.

FIG. 1B shows an example of an electromagnetic shielding member 12 provided on the inner side of the wall 1, an electromagnetic shielding member 11 provided on the lower surface of the upper slab 2, and an electromagnetic shielding member provided on the lower surface of the lower slab 3. It is configured to be covered with a shielding material 14 and electromagnetically shielded from the upper and lower floors and the outer space of the wall 1. In this case, the butt between the slab 3 and the wall 1, that is, the lower slab 3
Shielding layer and wall 1 by electromagnetic shielding material 14 provided on the lower surface of
By providing an electromagnetic shielding material 13 with a predetermined length L on the upper surface of the lower slab 3 with respect to the opening formed in the cross section of the slab 3 between the electromagnetic shielding layer and the electromagnetic shielding material 12 inside the A radio wave attenuation section is formed between the members 13 and 14 where the radio waves are repeatedly reflected and absorbed / attenuated.

In the example shown in FIG. 1C, the electromagnetic shielding members 21 and 23 are provided on the lower surfaces of the upper slab 2 and the lower slab 3 similarly to the example shown in FIG. Slabs 2 and 3 in the electromagnetic shielding space
A beam 8 and a partition wall 9 are provided between them.
Accordingly, in this case, the electromagnetic shielding layer 21 of the butt portion of the slab 2 and the beam 8 and the partition wall 9 forms an electromagnetic shielding layer on the electromagnetic shielding layer 21 by the electromagnetic shielding material 21 at the butt portion of the slab 3 and the beam. An opening is formed in the section of the beam in the electromagnetic shielding layer made of the material 23. By providing electromagnetic shielding members 22 and 24 with a predetermined length L from both sides to this opening, a radio wave attenuation section is formed between the electromagnetic shielding members 22 and 24 where radio waves are repeatedly reflected and absorbed / attenuated. doing.

By providing the electromagnetic shielding material extending along both sides from the opening / gap portion of the electromagnetic shielding layer as described above, radio waves leaking from the opening / gap portion of the electromagnetic shielding layer are repeatedly reflected by the electromagnetic shielding material. The electromagnetic shielding performance can be prevented from deteriorating due to the opening of the electromagnetic shielding layer generated at the butt portion between the slab and the wall.

As described above, by providing the electromagnetic shielding material extending from the opening of the electromagnetic shielding layer along both sides of the slab and the wall, the radio wave leaking from the opening of the electromagnetic shielding layer is repeatedly reflected by the electromagnetic shielding material. It can be absorbed and attenuated, and can be attenuated by structural members such as slabs and walls made of concrete and reinforcing steel, and it is possible to prevent the electromagnetic shielding performance from being reduced at the cross-section due to the butt between the slab and the wall. For example, when looking at the amount of attenuation when the concrete thickness is 150 mm, in the case of unreinforced concrete,
4.0 to 5.0 dB for a frequency of 200 MHz, 7.5 dB for a frequency of 1 GHz, and 9.0 dB for a frequency of 10 GHz.
3.5 to 5.0 dB for 00 MHz, frequency 1 GH
It is reported that there is 9.5 to 12.0 dB for z and 9.0 to 13.0 dB for a frequency of 10 GHz (for example, IEICE Technical Report, EMCJ78-38 (1978-1).
1)). As is clear from such values, by increasing the length of the column electromagnetic shielding member 6, the damping effect of the structural members of the column 4 can be increased. In the present inventor, the length L of the column electromagnetic shielding member 6 is at least three times the diameter D of the column 4 (L> 3D), and a great effect is obtained.

The electromagnetic shielding members 11, 14, 21 and 23 include:
As mentioned above, if it is a new construction, use a steel foam that also serves as a floor form and a buried steel plate form for a beam, and use a renewal of existing buildings and electromagnetic shielding materials 4, 6, 7, and 12 If so, an electromagnetic shielding material such as a metal mesh, a copper foil, a conductive paint, or a conductive cloth can be used, and not only a material that reflects radio waves but also a material that absorbs radio waves may be used. On the other hand, as the electromagnetic shielding members 5, 13, 22, and 24, electromagnetic shielding members such as metal mesh, copper foil, conductive paint, and conductive cloth can be used. Is absorbed and attenuated while being repeatedly reflected, so that a radio wave absorbing material that absorbs radio waves is more preferable.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, an example in which the electromagnetic shielding material having a predetermined length or more is arranged along both surfaces of the butt portion of the slab and the wall, but similarly, the butt portion of the wall and the wall and the pillar are similarly arranged. It goes without saying that it can be applied.

[0017]

As is apparent from the above description, according to the present invention, an electromagnetic shielding material having a length not less than a predetermined length using an electromagnetic shielding material on both sides with respect to an opening of an electromagnetic shielding layer formed at a butt portion between a slab and a wall. Since the attenuation section is provided, even when the butted portion cannot be covered, the electromagnetic shielding performance can be prevented from lowering by simple construction, and a more sophisticated electromagnetic shielding space can be constructed. In addition, when the electromagnetic shielding space is divided into upper and lower floors, even if there is a partition wall, the slab can be divided on only one side of the upper surface or the lower surface. Therefore, especially when renewal, many equipment is installed on the floor surface and it is difficult to construct it unless it is from the lower surface of the slab (inside the ceiling), or conversely, equipment piping and equipment are complicatedly arranged in the ceiling Even if it is difficult to integrate with the electromagnetic shielding material on the wall, such as when the construction is difficult only from the top surface (floor surface), the desired shielding performance level is achieved by simple construction without lowering the electromagnetic shielding performance it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a method for constructing a wall / floor butt portion of an electromagnetic shielding building according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of an electromagnetic shielding building.

FIG. 3 is a diagram for explaining a decrease in shielding performance due to an opening of an electromagnetic shielding layer generated at a butt between a slab and a wall.

[Explanation of symbols]

1 ... wall, 2, 3 ... slab, 4-7, 11-14, 21-
24: electromagnetic shielding material, 8: beam, 9: partition wall

Claims (3)

[Claims] 1. An electromagnetic shielding building which forms an electromagnetic shielding space by performing electromagnetic shielding on one side of a surrounding wall and a slab by using an electromagnetic shielding material, wherein an electromagnetic shielding layer generated at a wall / floor abutting portion of the slab and the wall. A method for constructing a wall / floor butt portion of an electromagnetic shielding building, characterized in that an attenuation section having a predetermined length or more using an electromagnetic shielding material is provided on both sides of the opening. 2. The method according to claim 1, wherein the damping section is provided on a partition wall connected to the slab. 3. The method according to claim 1, wherein the damping section is provided on a slab abutting the wall.