JP2501619B2 - Electromagnetic shield structure - Google Patents

Description

The present invention relates to an electromagnetic wave shield structure.

(Prior art) In recent buildings, electromagnetic waves are absorbed on the wall surface of the building to prevent inflow of harmful radio waves from the outside and electromagnetic waves generated from electromagnetic devices in the building to leak to the outside as harmful radio waves. The body (ferrite tile) is often attached.

The present applicant has previously filed a few applications for this type of invention (see Japanese Patent Application No. 61-288451, Japanese Patent Application No. 62-146425 and Japanese Patent Application No. 62-03081).

(Problems to be Solved by the Invention) However, so far, there have been few things that can shield almost completely the inflow of harmful radio waves into a building and the leakage of indoor electromagnetic waves to the outside.

The present invention has been proposed in view of the above circumstances, and an electromagnetic wave shield structure capable of substantially completely preventing the inflow of harmful radio waves and the leakage of indoor radio waves and being extremely easy to install. It is intended to provide goods.

(Means for Solving the Problems) The present invention is excellent in conductivity and electrically connects core materials formed in a grid or mesh shape with a mesh size of at least about 50 mm square, and Is installed in concrete, and a mixture of fibrous, powdery or granular conductive material with excellent conductivity is mixed in the concrete in a volume ratio of 1 to 3% required for electrical contact or electrostatic bonding. By the above, the above-mentioned object is achieved.

(Embodiment) FIGS. 1 and 2 show an electromagnetic wave shield structure according to the present invention.

The walls 2, pillars 3, beams 4 and floor slabs 5 of the electromagnetic wave shield structure 1 are formed by placing concrete 7 containing a highly conductive mixed material around a highly conductive core material 6. It is completely integrated.

The core material 6 is made of a metal plate such as a reinforcing bar, punching metal, or a steel plate, and is formed in a grid shape with mesh sizes of at least 50 mm square (see FIG. 17).

3 to 12 show a core material 6 and an example of use thereof. Of these, the core material 6 shown in FIG. 3 is a reinforcing bar 8, ...
Are arranged in a grid and the fulcrums of the reinforcing bars are fixed by welding or the like so that sufficient electrical conductivity can be obtained.

4 and 5 show examples of use of the core material 6, FIG. 4 shows one core material 6 arranged in concrete 7, and FIG. 5 shows the electromagnetic shielding effect. Two core materials 6 are arranged in concrete 7 for the purpose of raising it.

The core material 6 shown in FIG. 6 is made of a thin metal plate in which numerous cuts are made and pulled to obtain a mesh size of at least 50 mm.
It is a so-called expanded metal formed in a mesh shape of about a corner.

7 and 8 show an example of use of the core material 6, and FIG. 7 shows one core material 6 arranged.
The figure shows concrete 7 for the purpose of enhancing the electromagnetic wave shielding effect.
One core member 6 is arranged inside, and core members 6, 6 made of a reinforcing bar shown in FIG. 3 are arranged on both sides of the core member 6.

Further, the core material 6 shown in FIGS. 9 and 11 is constructed by arranging a plurality of thin flat bars 9 in a grid pattern and welding the intersections of the flat bars 9 ,.

Of these, the core material 6 shown in FIG. 9 is formed in a lattice shape by aligning the width direction of the flat bar 9 in the longitudinal direction of the wall and the like, and the core material 6 shown in FIG. Are aligned in the thickness direction of the wall to form a grid.

Also, FIGS. 10 and 12 show one core material 6 arranged in concrete 7.

Furthermore, in the concrete 7, the mixture material 10 in the form of fibers, powder or granules, which has extremely excellent conductivity, is used.
It is uniformly mixed throughout.

Therefore, the electromagnetic wave shield structure 1 has extremely high conductivity over the whole due to electrical contact or electrostatic bonding between the core materials 6 and 6, the mixed materials 10 and 10 and the core material 6 and the mixed material 10. It is possible to completely block inflow of harmful radio waves and leakage of indoor radio waves.

As the mixed material 10, for example, steel fiber, carbon fiber (0.5
Mm fiber (0.5 mm x 0.5 mm x 30 mm) IS fiber (trade name) or powder or granules made of metal or synthetic resin can be used, but it has excellent conductivity and is bad for concrete. It is not limited to this as long as it does not exceed.

This kind of mixed material is mixed during the production of concrete, but it is most effective and mixed economically when mixed in a volume ratio of about 1 to 3%. Naturally, the mixing method is also optimal when adding the mixed material to the state of raw concrete in which water is added to aggregate, cement, and sand.

FIGS. 13 to 14 show a shield panel and a joining method thereof. The shield panel 11 is a panel in which the mixture material 10 is mixed in ordinary concrete and the core material 6 is installed in the concrete. And a frame member 12 made of chevron steel, a flat bar or the like is attached to the peripheral portion thereof.

Of these, the shield panel 11 shown in FIG. 13 and FIG.
Lattice rebar is used as the core material for the core panel, the shield panel 11 shown in FIG. 15 uses the core material formed of a flat bar as the core material, and the shield panel shown in FIG.
Expanded metal is used as the core material for 11, and all other configurations are the same.

In addition, in order to make the conductivity between the panels as good as possible by joining the panels, connect the frame members 12, 12 to each other with the connecting bolt 1
It is done by bolting with 3,13 and if necessary, the connection part is filled with concrete.

Even if the frame members 12, 12 are welded to each other, the conductivity between the panels can be maintained.

FIGS. 17, 18 and 19 show the experimental results of the electromagnetic wave shielding effect relating to the present invention.

Of these, the graph shown in FIG. 17 is the result of an experiment in which only the core material formed by lattices of reinforcing bars is installed in ordinary concrete, and the graph shown in FIG. 18 is 1% by volume in ordinary concrete or Fig. 19 shows the experimental results when only 2% of the admixture was mixed, and the graph shown in Fig. 19 shows that 1% or 2% by volume of the admixture was mixed into ordinary concrete, and the concrete was rebar It shows an experimental result when a core material formed in a shape is installed.

As a result of the experiment, when only the core material is installed in ordinary concrete, the low frequency electromagnetic wave shielding effect is high, but the high frequency electromagnetic wave shielding effect is small. On the other hand, when only the mixed material is mixed into ordinary concrete, the shielding effect of low frequency electromagnetic waves is small, but the shielding effect of high frequency electromagnetic waves is large. Furthermore, when the amount of the mixed material is large, the shield effect is large overall.

It can be understood that the shielding effect of both low-frequency and high-frequency electromagnetic waves is great when the mixed material is mixed with ordinary concrete and the core material is installed.

(Effects of the Invention) The present invention has the above configuration, and thus has the following effects.

Mixed materials such as steel fibers mixed in concrete,
Since it has the same reinforcing effect as the reinforcing steel, it can significantly increase the strength of concrete together with the core material.

Not only the electromagnetic wave shielding effect of the core material and the electromagnetic wave shielding effect of the mixed material are combined, but the drawbacks of both can be complemented to further enhance the electromagnetic wave shielding effect.

Since only a predetermined amount of the mixed material needs to be mixed when the concrete is mixed, the other conventional construction methods can be used, so that the construction is extremely simple.

[Brief description of drawings]

1 to 15 show an embodiment of the present invention.
FIG. 1 is a longitudinal sectional view of the electromagnetic wave shield structure, FIG. 2 is a partial sectional view of a frame of the electromagnetic wave shield structure, FIG. 3, and FIG.
Figures 9, 9 and 11 are partial front views of the core material, and Figures 4, 5, 7, 8 and 10 are partial cross-sectional views of the body. FIGS. 13 to 16 show an electromagnetic wave shield panel and a joining method thereof. FIGS. 13, 15 and 16 are sectional views of the joining portion, FIG. 14 is a side view thereof, FIG. 18th
FIG. 19 and FIG. 19 are graphs showing the experimental results of this invention. 1 ... Electromagnetic wave shield structure, 2 ... Wall, 3 ... Pillar, 4
... beams, 5 floors, 6 core materials, 7 concrete,
8 ... Reinforcing bar, 9 ... Flat bar, 10 ... Mixed material, 11 ...
… Shield panel, 12… Frame member, 13… Connecting bolt.

Claims (1)

(57) [Claims] 1. A core material, which is excellent in conductivity and has a mesh size of at least about 50 mm square and formed in a grid or mesh, is electrically connected, and these are installed in concrete. Electromagnetic wave shield characterized by mixing fibrous, powdery or granular mixed material having extremely excellent conductivity in concrete at a volume ratio of 1 to 3% necessary for electrical contact or electrostatic bonding Structure.