JPH0893075A - Electric wave absorption type carbon fiber reinforced concrete curtain wall - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a curtain wall that is relatively inexpensive, eliminates restrictions on design, and is effective as a measure against television interference. [Structure] A radio wave reflector (2), a first CFRC plate (3), a second CFRC plate (4), and a third CFRC plate in which the complex permittivity gradually decreases toward the outside from the inside to the outside of the steel frame (1). (5), the resistance film (6) and the finishing material (F) are laminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorption type carbon fiber reinforced concrete curtain wall, and more particularly to a radio wave absorption type carbon fiber reinforced concrete curtain wall which is effective as a countermeasure against television radio wave reflection interference.

[0002]

2. Description of the Related Art Approximately 20 years have passed since the TV radio wave reflection interference caused by buildings became a social problem.

At present, there are two countermeasures for a TV radio wave reflection obstacle due to a building wall: (1) a radio wave absorbing wall using a ferrite radio wave absorbing material, and (2) a building shape method utilizing diffuse reflection of radio waves on the wall surface. There is one.

(1) As shown in FIGS. 6 and 7, the radio wave absorbing wall is formed by inserting a ferrite tile (radio wave absorbing body) 22 between a precast concrete curtain wall 21 and a surface finishing material 24 thereof. Surface finishing material 24
The radio wave transmitted through is absorbed by the ferrite tile 22 and does not generate a reflected wave. In the figure, 23 is a reinforcing bar (radio wave reflector), and 25 is a window glass.

This ferrite electromagnetic wave absorption wall has a remarkable prevention effect, but is very expensive, and cannot be entirely used in a rapidly increasing skyscraper.

Next, regarding the diffuse reflection type wall of (2), when a radio wave is incident on a precast concrete curtain wall on a plane, a strong beam-like reflected wave is generated as if the light is reflected by a mirror, and a reflection obstacle occurs. To do. However, if the wall surface is a curved surface 26 of the order of several meters as shown in FIG. 8 or if a large number of ribs 27 of about 1 m are attached as shown in FIG. Does not occur.

[0007] This diffuse reflection type wall has a design restriction and cannot be applied to all buildings.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a radio wave absorption type carbon fiber reinforced concrete curtain wall which is relatively inexpensive and which is effective as a countermeasure against TV reflection interference which eliminates design restrictions. It is an object.

[0009]

According to the present invention, a reinforcing steel frame or rib is provided on the outside in order from the inside with a radio wave reflector, and a multi-layer containing a ferrite powder or the like whose complex permittivity is gradually decreased toward the outside. It is characterized by laminating the carbon fiber reinforced concrete board, resistance film and finishing material.

Further, according to the present invention, a multi-layer carbon fiber reinforcement containing a radio wave reflector on the outside of the reinforcing steel frame or ribs in order from the inside, and a ferrite powder whose complex permittivity gradually decreases toward the outside. It is characterized by laminating a concrete plate, a resistance film and a finishing material between these carbon fiber reinforced concrete plates.

Further, according to the present invention, a radio wave reflection plate, a carbon fiber reinforced concrete plate containing ferrite powder and the like, and a vinylon fiber reinforced concrete plate containing ferrite powder and the like in this order from the inside to the outside of the reinforcing steel frame or rib. It is characterized in that a resistance film and a finishing material are laminated.

Furthermore, the carbon fiber reinforced concrete plate containing ferrite powder and the like and the vinylon fiber reinforced concrete plate containing ferrite powder and the like are characterized in that the side cross-sectional shape of the contact surface is formed in a continuous triangular wave shape.

[0013]

In the electromagnetic wave absorption type carbon fiber reinforced concrete curtain wall constructed as described above, since inexpensive ferrite powder is used, it can be provided at a low cost.

Further, since the flat plates are laminated, restrictions on design can be eliminated.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a curtain wall, generally designated by reference numeral 1, is on the outside of a reinforcing steel frame or rib 1 and on the outside of a metal reflector 2 and multiple layers (three layers in the illustrated example) in order from the inside. Carbon fiber reinforced concrete containing ferrite powder and the like having a gradually decreasing complex dielectric constant, so-called CFRC first CFRC plate 3, second CFRC plate 4, third CFRC plate 5, resistance film 6 and finishing material (paint layer, tile, granite, etc.) ) F are laminated to form a flat plate.

Next, the operation will be described.

The complex permittivity and complex magnetic permeability of the CFRC plate vary depending on the kind and amount of the contaminants. The CFRC plate having the appropriate complex permittivity and complex permeability and the resistance film 6 having an appropriate resistance value are layered. By combining with, for example, wall thickness 20c
If it is m or less, VHF TV radio waves are properly absorbed.

FIG. 2 shows an essential part of another embodiment of the present invention. In this curtain wall A1, the CFRC plate is provided with a gradient such that the complex permittivity ε increases toward the inside, and the first CFRC plate is formed. Plate 7, second CFRC plate 8, third CFR
In this example, the C plate 9, the fourth CFRC plate 10, and the fifth CFRC plate 11 are formed.

FIG. 3 shows another embodiment of the present invention. In this curtain wall A2, the first CFRC plate 12 and the second CFRC plate are used.
Between the FRC plate 14 and the second CFRC plate 14 and the third CF
This is an example in which the resistance films 13 and 15 are provided between the RC plate 16 and the RC plate 16 and the other parts are configured in the same manner as in FIG. In this embodiment, by increasing the number of resistive films, generally, the frequency band of radio waves to be absorbed can be widened.

FIG. 4 shows another embodiment of the present invention. In this curtain wall A3, a vinylon fiber reinforced concrete board, a so-called VFRC, is provided outside one CFRC board 17.
This is an example in which the plate 18 is provided and the others are configured in the same manner as in FIG. Since the VFRC plate 18 does not contain carbon fiber, the CFR
The complex permittivity is smaller than that of the C plate 17. In this embodiment, the structure can be simplified.

FIG. 5 shows another embodiment of the present invention. In this curtain wall A4, the side cross-sectional shape of the contact surface between the CFRC plate 19 and the VFRC plate 20 is formed into a continuous triangular wave shape, and the others are shown. This is an example configured in the same manner as in No. 4. A gradient of the complex permittivity is obtained in the triangular wave-shaped side cross-sectional shape.

[0023]

Since the present invention is configured as described above, it is possible to effectively absorb radio waves.

Further, it can be provided at a relatively low cost by using an inexpensive ferrite powder.

Further, the flat curtain wall can eliminate design restrictions.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a main part of a second embodiment of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a side sectional view showing an essential part of a fifth embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional ferrite radio wave absorption film.

7 is a side sectional view for explaining the principle of FIG.

FIG. 8 is a side sectional view showing an example of a conventional diffuse reflection type wall.

FIG. 9 is a side sectional view showing another example of a conventional diffused reflection type wall.

[Explanation of symbols]

 A, A1 to A5 ... Curtain wall F ... Finishing material 1 ... Steel frame or rib 2 ... Radio wave reflector 3, 7, 12 ... First CFRC plate 4, 8, 14 ... 2nd CFRC plate 5, 9, 16 ... 3rd CFRC plate 6, 13, 15 ... Resistive film 10 ... 4th CFRC plate 11 ... 5th CFRC plate 17, 19 ... CFRC plate 18, 20 ... ..VFRC plate 21 ... Precast concrete curtain wall 22 ... Ferrite tile 23 ... Reinforcing bar 24 ... Surface finishing material 25 ... Window glass 26 ... Curved surface 27 ... Rib

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication H05K 9/00 M (72) Inventor Hiroaki Nakagawa 2-19-1 Tobita, Chofu-shi, Tokyo Kashima Construction (72) Inventor Shigeyuki Akihama Shigeyuki Akihama 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hiroki Kazumi 2-1-1 Tobita, Chofu-shi, Tokyo Kashima Construction (72) Inventor Yo Otani 1-9-11 Nihonbashi Horidome-cho, Chuo-ku, Tokyo Kureha Chemical Industry Co., Ltd. (72) Inventor Haruo Nozaki 1-9-11 Nihonbashi-Horidome-cho, Chuo-ku, Tokyo Issue Kureha Chemical Industry Co., Ltd. (72) Inventor Aisaku Nagai 16 Ochiai, Nishiki-cho, Iwaki, Fukushima Prefecture Kureha Chemical Industry Co., Ltd. Nishiki Research Institute

Claims (4)

[Claims] 1. A reinforcing steel frame or rib, a radio wave reflector in this order from the inside to the outside, a multi-layer carbon fiber reinforced concrete plate containing a ferrite powder or the like having a complex permittivity gradually decreasing toward the outside, a resistance film, and A radio wave absorption type carbon fiber reinforced concrete curtain wall that is made by laminating finishing materials. 2. A multi-layer carbon fiber reinforced concrete plate containing a radio wave reflector in order from the inside to the outside of a reinforcing steel frame or ribs, and ferrite powder whose complex permittivity gradually decreases toward the outside, and these carbon fibers. A radio wave absorption type carbon fiber reinforced concrete curtain wall characterized by laminating a resistance film and a finishing material between reinforced concrete plates. 3. A radio wave reflection plate, a carbon fiber reinforced concrete plate containing ferrite powder and the like, a vinylon fiber reinforced concrete plate containing ferrite powder and the like, a resistance film and a finishing material in order from the inside to the outside of the reinforcing steel frame or rib. A radio wave absorption type carbon fiber reinforced concrete curtain wall that is laminated. 4. The side cross-sectional shape of the contact surface of the carbon fiber reinforced concrete plate containing ferrite powder or the like and the vinylon fiber reinforced concrete plate containing ferrite powder or the like is formed in a continuous triangular wave shape. The electromagnetic wave absorption type carbon fiber reinforced concrete curtain wall described.