JPH10299124A - Column opening part executing method of electromagnetic shielding building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reduction in electromagnetic shielding performance by forming an electromagnetic shielding space by performing electromagnetic shielding on a peripheral wall and one surface of a slab by using an electromagnetic shielding material, and covering the whole outer peripheral surface of an electromagnetic shielding surface side column of the slab with the electromagnetic shielding material. SOLUTION: The inside of a wall 1, an under surface of a slab 2 and an outer peripheral surface of a beam 3 are covered with an electromagnetic shielding material 5, and are shielded from an unshielded space of the upper floor, and an electromagnetic shielding space is formed. The whole outer peripheral surface of an electromagnetic shielding surface side column 4 of the slab 2 is covered with a columnar electromagnetic shielding material 6, and is electrically connected to the electromagnetic sheilding material 5 of the slab 2, and is integrally formed. Next, a length L of the columnar electromagnetic sheilding material 6 is set to (L>3D) not less than three times a diameter D of a column 4, and in the case of new construction, a steel form also serving as a floor form and a left-in-place-steel plate form for a beam are used as the electromagnetic sheilding material 5, and in the case of an existing building, an electromagnetic shielding material such as metallic meshes and copper foil is used. Therefore, reduction in electromagnetic sheilding performance by an opening of an electromagnetic sheilding layer of the slab generated in a column part can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a column opening of 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.

[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 the above-described conventional technology, if there is a pillar penetrating the electromagnetic shielding space, a radio wave is transmitted between the upper and lower floors in the pillar cross section of the slab. Leakage causes a problem that high-level electromagnetic shielding cannot be realized. That is, FIG. 3 is a diagram for explaining a decrease in shielding performance due to a column penetrating the electromagnetic shielding space. As shown here, when there is a column 80 penetrating the slab 70, the electromagnetic shielding material 90 causes the slab 70 to move. When performing electromagnetic shielding, there is a problem in that an opening is formed on the electromagnetic shielding surface and electromagnetic shielding performance is reduced.

For example, when 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 that also serves 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 column cross section cannot be performed by itself. This problem is the same when performing electromagnetic shielding on the upper surface of the slab 70.

[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 of an electromagnetic shielding layer of a slab at a pillar portion.

Therefore, the present invention relates to 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, and wherein the entire outer peripheral surface of a column on the electromagnetic shielding surface side of the slab is provided. Is covered with an electromagnetic shielding material and is integrated with an electromagnetic shielding material of a slab, and an outer peripheral portion of a column covered with the electromagnetic shielding material is at least three times the thickness of the column. Things.

[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 column opening of an electromagnetic shielding building according to the present invention, wherein 1 is a wall, 2 is a slab, 3 is a beam, 4 is a column, 5 is an electromagnetic shielding material, 6
Indicates a column electromagnetic shielding material.

In FIG. 1, the electromagnetic shielding space covers the inside of the wall 1, the lower surface of the slab 2, and the outer peripheral surface of the beam 3 with an electromagnetic shielding material 5 to shield the shielded space on the upper floor. is there. In such an electromagnetic shielding space, when there is an independent column 4, an opening is formed in the electromagnetic shielding layer by the electromagnetic shielding material 5 at the cross section where the column 4 is in contact with the lower surface of the slab 2 or the beam 3, and the column is closed. Can not do. The column electromagnetic shielding material 6
The entire upper surface of the column 4 is covered and electrically connected to the electromagnetic shielding member 5 to be integrated.

By providing the columnar electromagnetic shielding member 6 extending cylindrically from the opening of the electromagnetic shielding layer as described above, radio waves leaking from the opening of the electromagnetic shielding layer can be prevented.
In addition to absorbing and attenuating while repeating reflection, it can be attenuated by the structural members of the pillars 4 made of concrete and reinforcing steel, and the provision of the pillars 4 prevents the electromagnetic shielding performance from being reduced in the cross-sectional portion. be able to.
For example, when looking at the amount of attenuation when the concrete thickness is 150 mm, in the case of plain concrete, the frequency is 200 MHz
4.0 to 5.0 dB for z, 7.5 dB for 1 GHz, and 9.0 dB for 10 GHz. For reinforced concrete, 3.5 to 5.0 dB for 200 MHz. 9.5 for 1 GHz
１12.0 dB, 9.0-1 for a frequency of 10 GHz
It is reported to be 3.0 dB (see, for example, IEICE, EMCJ 78-38 (1978-11)). 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.

As described above, if the electromagnetic shielding material 5 is a new construction, a steel foam that also serves as a floor form and a padded steel plate form for beams are used for the electromagnetic shielding material 5, and the electromagnetic shielding material 5 may be renewed for an existing building. For example, 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 column electromagnetic shielding material 6, an electromagnetic shielding material such as a metal mesh, a copper foil, a conductive paint, or a conductive cloth can be used, but while repeatedly reflecting the leaked radio waves as described above. A radio wave absorber that absorbs radio waves is preferred because it absorbs and attenuates.

Note that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the above embodiment, an example in which the electromagnetic shielding is performed on the lower surface of the slab has been described. However, it is needless to say that the same can be applied to the case where the electromagnetic shielding is performed on the upper surface of the slab. Further, the present invention can be similarly applied to a partition wall provided in the same electromagnetic shielding space.

[0014]

As is apparent from the above description, according to the present invention, the entire outer peripheral surface of the column on the electromagnetic shielding surface side of the slab is covered with the electromagnetic shielding material and integrated with the electromagnetic shielding material of the slab.
The simple construction of not only new construction but also the renewal of an existing building can prevent the electromagnetic shielding performance from deteriorating due to the opening of the electromagnetic shielding layer of the slab generated in the cross section of the pillar, and a more advanced 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 pillar, it can be divided on only one surface of the upper surface or the lower surface of the slab.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a method for constructing a column opening 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 a column penetrating an electromagnetic shielding space.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wall, 2 ... Slab, 3 ... Beam, 4 ... Column, 5 ... Electromagnetic shielding material, 6 ... Column electromagnetic shielding material

Claims (2)

[Claims] 1. An electromagnetic shielding building in which an electromagnetic shielding space is formed by performing electromagnetic shielding on one surface of a surrounding wall and a slab using an electromagnetic shielding material, wherein the entire outer peripheral surface of a column on the electromagnetic shielding surface side of the slab is electromagnetically shielded. A method for constructing a column opening of an electromagnetic shielding building, wherein the method is integrated with an electromagnetic shielding material of a slab covered with a slab. 2. The method according to claim 1, wherein an outer peripheral portion of the column covered with the electromagnetic shielding material has a length at least three times the thickness of the column.