JP2553256Y2 - Radio wave absorption wall - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorbing wall for preventing unnecessary reflected radio waves in the VHF and UHF bands, and more particularly, it can cope with a wide wall thickness of an outer wall of a building and the like, and has improved workability in manufacturing. It is related to radio wave absorption walls.

[0002]

2. Description of the Related Art In recent years, unnecessary reflected radio waves from high-rise buildings have become obstacles to television broadcasting, and radio wave pollution such as causing ghosts on television screens has become a problem. As a countermeasure, various types of radio wave absorption walls in which a ferrite plate is embedded in the outer wall of a high-rise building have been proposed.

[0003] Japanese Patent Publication No. 1-45238 discloses a concrete block on the back of a decorative block in which a plurality of leg pieces project from the back of a decorative board and a ferrite molding is fitted between adjacent leg pieces. A radio wave absorption wall integrally mounted is disclosed. FIG. 5 is a sectional view showing an example of the radio wave absorbing wall. The radio wave absorbing wall has a ferrite plate 62 disposed on a decorative block 61 having two legs 63, and the leg 63.
The concrete 65 is cast in such a manner that the tip of the concrete abuts on the reinforcing mesh 64.

In Japanese Patent Publication No. 45239/1994, an L-shaped surface material consisting of a horizontal part and a vertical part is placed in the wall slab concrete, and the horizontal part is flush with the outer surface of the wall slab concrete. As described above, the ferrite-based molded body is carried on each of the horizontal pieces, and the horizontal pieces are connected to the reinforcing mesh supported on each of the vertical pieces via a fixing member. A radio wave absorption wall is disclosed. FIG.
FIG. 3 is a sectional view showing an example of the radio wave absorbing wall. The radio wave absorbing wall has a ferrite plate 67 disposed on a surface material 66 having a leg 68 on one side, and a distal end of the leg 68 is disposed in contact with a reinforcing mesh 70, and the other is provided with a thin strip 69. The concrete 71 is cast and attached to the reinforcing mesh 70.

[0005]

In such a conventional radio wave absorbing wall, it is necessary to lengthen a leg part for anchor for fixing to a concrete layer to some extent.
Therefore, there is a problem that the weight of the exterior material increases and the radio wave absorption wall becomes thick. In addition, as shown in FIG. 6, when the thin strip is connected to the reinforcing mesh and fixed, the thin strip is connected to the reinforcing mesh in accordance with the number of the exterior blocks, and the man-hour is excessively increased. There is.

In view of the above circumstances, the present invention has a structure in which a long anchor leg is not required and a thin strip is not required to be connected to a reinforcing mesh, thereby improving the complexity of the manufacturing process. It is intended to provide a radio wave absorbing wall.

[0007]

Means for Solving the Problems In view of the above object, as a result of intensive research, the present inventors have found that a radio wave absorbing wall formed by fixing a ferrite plate to the back surface of an exterior tile and integrally molding it with concrete together with a reinforcing mesh. When a concave portion for a fixing member is formed on the back surface of the exterior tile, and the fixing member is locked in the concave portion, and then concrete is poured, the exterior tile and the ferrite plate are firmly fixed to the concrete, and the thin strips are formed. Since there is no need to connect the reinforcing bar mesh with a piece or the like, the inventors have found that the manufacturing process is simple, and have arrived at the present invention.

[0008] That is, the radio wave absorption wall of the present invention is formed by disposing a ferrite plate on the back surface of the exterior tile, integrally molding it with concrete together with a reinforcing mesh, and fixing the exterior tile to the concrete by a fixing member. A pair of continuous grooves extending from one end to the other end is formed at a place where the ferrite plate is not arranged on the back surface of the exterior tile, the groove has an opening narrower than the inside, and the fixing member is A shear connector having locking portions at both ends, wherein each of the locking portions is locked in each groove, and a main body portion of the shear connector is fixed to concrete.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an exterior tile and a ferrite plate of a radio wave absorption wall according to an embodiment of the present invention. As shown in FIG. 1, the exterior tile 1 is provided with a pair of fixing member grooves 3 at the outer edge of the back surface, and two ferrite plates 2 are provided on a flat surface sandwiched between the grooves 3. It is fixed. In the present embodiment, the groove 3 formed in the exterior tile 1 is formed so as to have a substantially equilateral trapezoidal cross section.

FIG. 2 is a front view of a shear connector, which is an example of a fixing member that can be locked in the groove 3 of such an exterior tile. The shear connector 4 has, at both ends thereof, locking portions 41 each having a shape that fits exactly into the groove 3 of the exterior tile. In the present embodiment, the shape of the locking portion 41 of the groove 3 and the shear connector 4 is substantially a trapezoidal shape, and each locking portion is locked in the groove, so that the shear connector 4 does not come off, and In addition, it is possible to maintain a substantially upright state even when concrete is poured.

After such a shear connector 4 is mounted on the exterior tile 1, a reinforced mesh is laid, and then concrete is cast to form a radio wave absorbing wall. At this time, the sheer connector 4 is buried in the cast concrete to prevent the exterior tile 1 from coming off.

A radio wave absorbing wall is provided with such an exterior tile 1,
With the structure including the ferrite plate 2, the shear connector 4, the reinforcing mesh (not shown), and the concrete (not shown), it is not necessary to extend the anchor leg from the exterior tile 1, and the wall The thickness is not affected by the length of the anchor leg. Even if the thin strip is not connected to the reinforcing mesh, a sufficient fixing strength of the exterior tile 1 can be obtained.

In this embodiment, two ferrite plates are provided on one exterior tile. this is,
Usually, a ferrite plate having a size of about 100 mm x 100 mm is used. However, in general, a radio wave absorbing wall for a building is dense in a vertical direction (direction of a magnetic field component of an incoming radio wave) and horizontally (in a direction of an incoming radio wave). (In the direction of the electric field component), the ferrite plate is discontinuously arranged, and the fixing means of the exterior tile is constituted by using the discontinuous portion in the horizontal direction. Arranging two ferrite plates on one exterior tile is more convenient in terms of construction of a radio wave absorption wall.

In the present invention, it is necessary that the shape of the groove 3 does not easily come off when the shear connector 4 is mounted. For this purpose, the opening must be small and the inside must be enlarged. Examples of such a shape include a right-angled triangular groove as shown in FIG. 3 and a semi-circular groove. The groove 3 for the shear connector can be easily formed when extruding the exterior tile.

FIG. 4 is a front view of another shear connector that can be used in the present invention. The shear connector 4 has spring elasticity, and both ends are bent in a hook shape. When the locking portion 41 is attached to the groove 3 of the exterior tile, the outer end portion of the groove is pressed by the spring pressure, and the theater nectar 4 is maintained almost upright. As described above, the shear connector does not need to have the locking portion having the same shape as the groove as long as the shear connector can maintain a substantially upright state even when the concrete is poured. However,
In the case of the example shown in FIG. 4, the distance D between the locking portions of the shear connector needs to be larger than the distance between the pair of groove portions of the exterior tile. As long as such a condition is satisfied, the shape of the shear connector is not limited to this embodiment, but may be various.

The shear connector 4 is preferably of such a size that it does not reach the reinforcing mesh when locked to the exterior tile. However, when the shear connector 4 is locked to the exterior tile 1 with the reinforcing mesh interposed therebetween. It can be a large shear connector. Even in this case, the number of construction steps does not increase, and the falling off of the exterior tile 1 is completely prevented.

Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, the number of ferrite plates to be installed is not limited to one and is two.
The number may be set appropriately according to the size of the exterior tile and the size of the ferrite plate.

[0018]

[Effects of the Invention] According to the present invention, a long anchor leg is not required, and a fixing member for fixing an exterior tile can be easily attached. Is improved. Further, if a fixing member such as a scissor having a locking portion in two directions is used, fixing between the exterior tiles can be easily achieved.

Further, in the radio wave absorption wall of the present invention, if a large exterior tile is used and a plurality of ferrite plates are installed on one exterior tile, the number of exterior tiles used can be reduced. Thus, the construction can be simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view illustrating an exterior tile and a ferrite plate of a radio wave absorption wall according to an embodiment of the present invention.

FIG. 2 is a front view showing an example of a shear connector that can be used for the radio wave absorbing wall of the present invention.

FIG. 3 is an enlarged view showing a groove portion of an exterior tile of a radio wave absorbing wall according to another embodiment of the present invention.

FIG. 4 is a front view showing another example of the shear connector that can be used for the radio wave absorbing wall of the present invention.

FIG. 5 is a cross-sectional view showing an example of a conventional radio wave absorbing wall.

FIG. 6 is a sectional view showing another example of a conventional radio wave absorbing wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Exterior tile 2 ... Ferrite plate 3 ... Groove 4 ... Shear connector 41 ... Locking part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadao Naito 4-51 Nakagomiota-cho, Yokohama City, Kanagawa Prefecture Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Tatsuo Naito 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-61-270452 (JP, A) JP-A-1-108994 (JP, U) JP-A-63-177530 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A ferrite plate is arranged on the back surface of an exterior tile, formed integrally with concrete together with a reinforcing mesh , and the exterior tile is fixed by a fixing member.
In the radio wave absorbing wall fixed to the concrete, a pair of continuous grooves extending from one end to the other end is formed at a place where the ferrite plate is not arranged on the back surface of the exterior tile, and the groove has an opening narrower than the inside. And the fixing member is a shear connector having locking portions at both ends.
Each of the locking portions is locked in each groove, and
The body of the shear connector is fixed to concrete.
Wave absorber wall, characterized in that is.