JPH0216039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic shielding structure.

[Conventional technology]

Modern buildings are equipped with measures to prevent harmful radio waves from entering from outside and electromagnetic waves generated from electrical equipment inside the building from leaking outside as harmful radio waves.
Electromagnetic wave absorber (ferrite tile) on the wall of the building
These problems were addressed by attaching iron plates or surrounding the entire interior of the room.

The present applicant has also previously filed 2.3 applications for this type of invention (see Japanese Patent Application No. 288451/1983).

(Problem to be solved by the invention) However, so far, the only building that can almost completely shield the inflow of harmful radio waves into the building and the leakage of indoor electromagnetic waves to the outside is the one previously filed by the applicant. There were almost no exceptions.

Furthermore, many of the conventional structures of this type, including those of the present applicant, are generally difficult to construct.

This invention was proposed in view of these circumstances, and provides an electromagnetic shielding structure that can almost completely shield the inflow of harmful radio waves and the leakage of indoor radio waves, and is also extremely easy to construct. The purpose is to provide

(Means for Solving the Problems) This invention relates to an electromagnetic wave shielding structure capable of shielding harmful radio waves, and includes fibers, powders, or granules in the concrete of concrete structures such as walls and floor slabs. 1 to 3% of the volume ratio necessary for electrical connection by contact or electrostatic bonding is mixed with highly conductive material, and the joints between each frame, such as the joints between columns and beams, and each The above object is achieved by embedding a contact and a shear connector in the concrete joint of the building frame so that electrical connection can be made by contact or electrostatic bonding.

(Example) The present invention will be described below with reference to an illustrative example.

Figure 1 shows an electromagnetic shielding structure constructed using the reinforced concrete construction method.

The wall 2, the pillar 3 of the electromagnetic shielding structure 1,
In the concrete of the concrete framework of the beams 4 and floor slabs 5, a fiber-like, powder-like, or granular material 6 with extremely high conductivity is uniformly mixed throughout.

This highly conductive material 6
The electromagnetic shielding structure 1 has extremely high electrical conductivity as a whole due to the electrical connection by contact or electrostatic bonding, and is configured to almost completely block the inflow of harmful radio waves and the leakage of indoor radio waves.

Examples of highly conductive materials 6 include steel fibers, carbon fibers (about 0.5 mm x 0.5 mm x 30 mm) IS fiber (trade name), or powdery or granular materials made of metals, rigid resins, etc. However, as long as it has excellent conductivity and does not adversely affect concrete,
It is not limited to this.

This type of material 6 is mixed into concrete when it is mixed, and it is most effective and economical to mix it in at a volume ratio of about 1 to 3%. The best way to mix these materials is to add them to fresh concrete, which is made by adding water to aggregate, cement, and sand.

FIG. 18 shows experimental data of this invention, which will be explained below.

The figure shows 1 steel fiber in a 100mm thick concrete plate.
%, 100mm thick concrete plate only, punched metal plate (2.3mm thick)
Frequency for hole diameter 5φ, pitch 8mm)
This shows the attenuation characteristics.

As is clear from this experimental data, although the concrete plate mixed with steel fibers is not as effective as the punched metal plate, it is far more effective at damping than the plate made only of concrete.

Furthermore, when compared with punched metal plates, the present invention can be said to be far superior in terms of economy, workability, and other considerations.

2 and 3 show the joint between the wall 2 and the column 3. A shear connector 7 as shown in the figure is provided protruding from the joint, and a large number of contacts 8 are connected to the shear connector 7. By protruding into the concrete of the wall 2, it is possible to integrate the wall 2 and the column 3, and to make almost perfect electrical connection possible through contact or electrostatic bonding between the wall 2 and the column 3. It is something.

Figures 4 to 7 show the joints between the walls 2 and columns 3, and a shear connector 16 made of a punched metal plate as shown in the figure is attached to the concrete joints of the walls 2 and columns 3. By embedding, it is possible to integrate pre-cast concrete and post-cast concrete, and also to achieve almost complete electrical connection between pre-cast concrete and post-cast concrete. In addition, connector 1
6 and 16 shall be joined by bolting (see Fig. 5).

Further, numeral 9 in FIG. 6 is a temporary fixing member for temporarily fixing the shear connector 16 in pre-cast concrete immediately after pouring, and also serves to enhance the electrical connection between the shear connector 16 and the concrete.

FIGS. 8 to 5 show other embodiments of the present invention, in which walls 2 and columns 3 of an electromagnetic shielding structure 1 are constructed of columns and walls made of steel frames and reinforced concrete. This shows the joint with the

In either case, a shear connector 10 such as a stud bolt or the like shown in FIGS.
By protruding a contact body 11 as shown in the figure, or by protruding a large number of contacts 12 as shown in Figs. 3, and also enables almost perfect electrical connection between the wall 2 and the pillar 3.

Furthermore, FIG. 16 shows a joint between a wall 2 made of a concrete wall panel mixed with a highly conductive material 6 and a column 3 made of a steel frame material. The bracket 13 protruding from both ends and the frame 14 are connected by a plurality of connecting bolts 1.
5, and by this joining method, the wall 2 and the column 3 are also electrically connected.

Furthermore, FIG. 17 shows a wall 2 and a wall 2 made of wall panels similar to those shown in FIG. 16.
The wall 2 is connected to the wall 2 by bolting the frames 14 protruding from both ends with a plurality of connecting bolts 15. It is joined. By this joining method, the walls 2, 2 are also electrically joined. In addition,
It is desirable that the connecting members used in these or the steel fibers mixed into the concrete be plated to further increase conductivity.

Plating treatments include zinc, tin, nickel, and copper plating.

(Effects of the Invention) Since the present invention has the above configuration, it has the following effects.

Steel fibers and the like mixed into concrete become part of reinforcing members, increasing the strength of concrete and can also serve as shielding materials for electromagnetic shielding.

Construction is extremely simple, as all you need to do is mix in the required amount of highly conductive materials such as rope fibers when mixing concrete, and everything else can be constructed using conventional reinforced concrete construction methods. .

The conductivity of the entire building is significantly increased by the use of highly conductive materials such as rope fibers and carbon fibers, and the joints between the walls, floor slabs, and each frame, as well as the concrete joints of each frame, are greatly improved. Since the electrical conductivity of the section is significantly increased by the highly conductive contacts and shear connectors buried in this section, the inflow of harmful radio waves and the leakage of indoor radio waves can be almost completely shielded.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, in which FIG. 1 is a sectional view of an electromagnetic shielding structure, FIG. 2 is a sectional view showing a joint between a column and a wall, and FIG. Figure 3 is a partial perspective view of the same, Figures 4 to 6 are partial perspective views showing concrete pour joints, Figure 7 is a plan view thereof, and Figures 8 to 15 are pillars and walls. Figures 8 and 10 show the joints between columns and walls made of steel frames and reinforced concrete, respectively.
Figures 12 and 14 are cross-sectional views, and Figure 9
11, 13 and 15 are perspective views thereof, FIG. 16 is a cross-sectional view showing the joint between the column and the wall, each of which is made of steel frame material and a wall panel, and 17. The figure is a cross-sectional view showing a joint between wall panels, and FIG. 18 is a graph showing experimental data. 1... Electromagnetic shielding structure, 2... Wall, 3
... Column, 4 ... Beam, 5 ... Floor slab, 6 ... Material with excellent conductivity, 8 ... Contact, 7, 10 ...
Shear connector, 9...Temporary fixing member, 11...Contact body, 12...Contact element, 13...Bracket, 1
4... Picture frame, 15... Connection bolt, 16... Shear connector.

Claims (1)

[Claims] 1. Add highly conductive materials in the form of fibers, powder, or granules to the concrete of concrete structures such as walls and floor slabs at a volume ratio of 1 to 3% necessary for electrical bonding by contact or electrostatic bonding. mixed,
In addition, contacts and shear connectors are buried in the joints between columns and beams, the joints between each frame, and the concrete joints of each frame to enable electrical connection by contact or electrostatic bonding. An electromagnetic shielding structure characterized by: