JPH05331925A - Panel for radio wave-absorption wall - Google Patents

Abstract

PURPOSE:To obtain panels for radio wave-absorption walls applicable for both a wet process and a dry process, by unifying a concrete base plate constituted of expansive concrete with a radio wave absorption material, a decoration member and a radio wave reflector. CONSTITUTION:Concrete base plates 16, 16 constituting the superficial layer is made of an expansive concrete. Time concrete base plate 16 is unified with radio wave absorbing material like ferrite plates 14,... fixed on the wall face in a specified arrangement and decoration members like tiles 12 or others attached on the wall surface to constitute panels for radio wave absorption walls. It is preferable to unify these materials with a radio wave reflecting material 22. Concrete is placed at the back side of this panel 10 and cured as a wet process thereof. Or this panel 10 is fixed on a building body by a specified tool in a dry process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel for an electromagnetic wave absorbing wall.

[0002]

2. Description of the Related Art In recent years,
The problem that the reflection of TV radio waves due to high-rise buildings, that is, the reflected waves of TV radio waves due to the outer wall of high-rise buildings and the direct waves from the TV broadcasting tower are superposed, causing a ghost on the screen, has been highlighted. As a countermeasure, the outer wall of a high-rise building is constructed as an electromagnetic wave absorbing wall.

Various electromagnetic wave absorbing walls have been proposed to date. FIG. 7 shows an example thereof. In the case of this structural example, the ferrite plate 100 as a radio wave absorber is oriented inside the concrete wall in a direction parallel to the wall surface and is continuous in the up-down direction (strictly speaking, the magnetic field direction) with a space in the left-right direction. It is buried in a closed state.

However, in the case of the conventional electromagnetic wave absorbing wall body including this example, there is a problem in terms of workability, and various researches have been conducted, but in reality, a satisfactory one is not provided yet. ..

[0005]

The invention of the present application has been made to solve such problems. Thus, the invention of the present application relates to a panel for a radio wave absorbing wall body, which includes a concrete substrate constituting a surface layer portion of the wall body, and a radio wave absorber fixed to the surface of the wall body in a predetermined arrangement state. And a decorative material disposed on the surface of the wall body, which are integrated with each other (claim 1). Another invention of the present application is characterized in that the concrete substrate is made of expansive concrete (claim 2). Still another invention of the present application is characterized in that a radio wave reflector is integrated with the concrete substrate, the radio wave absorber and the decorative material (claim 3).

[0006]

As described above, according to the first aspect of the invention, the electromagnetic wave absorber, the decorative material and the concrete substrate are integrated into a panel. By using such a unitized panel, the electromagnetic wave absorbing wall body can be easily constructed.

Since the decorative material necessary for constructing the electromagnetic wave absorbing wall body and the electromagnetic wave absorbing body are connected and integrated by the concrete substrate to form a unit, when the electromagnetic wave absorbing wall body is wet-processed, it is dry-processed. In any case, the radio wave absorption wall body can be easily constructed.

[0008] For example, when the electromagnetic wave absorbing wall is wet-processed,
An electromagnetic wave absorbing wall can be constructed simply by placing concrete on the back side of the panel and solidifying it, and in the case of dry construction, the electromagnetic wave absorbing wall is constructed by fixing the panel to the body with a predetermined fixture. can do.

According to a second aspect of the present invention, a radio wave reflector is further integrated with the panel of this unit. When this panel is used, the construction of the radio wave absorbing wall can be performed more easily. it can.

According to a third aspect of the present invention, the concrete substrate is made of expansive concrete.

When manufacturing the above panel, the electromagnetic wave absorber and the decorative material are placed at a predetermined position, and a concrete material is poured into the panel to integrate them.

However, in general, concrete materials exhibit shrinkage behavior after being cast, and since the concrete and the electromagnetic wave absorber such as ferrite are not well-known to each other, a gap is generated at the contact interface between them and a crack is generated in the concrete substrate itself. Easy to do.

Thus, if a gap is created at the contact interface between the radio wave absorber and the concrete substrate, or if a crack occurs in the concrete substrate itself, the moisture will pass through these gaps and cracks when the radio wave absorbing wall is constructed. May enter inside from the wall surface.

Reinforcing bars are usually provided inside the electromagnetic wave absorbing wall, and when moisture enters the inside of the wall, the reinforcing bars rust and undergo volume expansion there, which propagates to the gaps and cracks. There is a risk of growing them.

In the present invention, however, since the concrete substrate constituting the surface layer of the wall is made of expansive concrete, it is possible to suppress the generation of the above-mentioned gaps and cracks due to the shrinkage behavior of concrete after placing, and the above-mentioned inconveniences occur. It is possible to avoid the occurrence of.

Further, according to the present invention, by preventing the concrete material from shrinking, it is possible to enhance the adhesion between the concrete substrate and the electromagnetic wave absorber, and to obtain the effect of enhancing the adhesive force.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIGS. 1 and 2, 10 is a panel for the electromagnetic wave absorbing wall, and 12 is a large ceramic tile. Here, the large tile refers to a tile whose one side is 300 mm or more.

On the back surface of the ceramic tile 12, a ferrite plate 14 as a radio wave absorber is arranged. The ferrite plates 14 are continuous with each other in the vertical direction (vertical direction when the radio wave absorption wall body is constructed, strictly speaking, the magnetic field direction), and are arranged at a predetermined interval in the direction perpendicular to this.

Reference numeral 16 denotes a concrete substrate which constitutes the surface layer of the wall body, and integrates the ferrite plate 14 and the tile 12 with most of the ferrite plate 14 buried inside.

The concrete substrate 16 is made of expansive concrete. Specifically, it is composed of a low-shrinking concrete material having a shrinkage ratio of [Chemical formula 1] or less after placing concrete. As such a low shrinkage concrete material, it is desirable to use one having a shrinkage ratio in the range of [Chemical Formula 2].

[0021]

[Chemical 1]

[0022]

[Chemical 2]

At the rear end of the ferrite plate 14, a conductive metal rod 18 extending in a direction perpendicular to the arrangement direction (continuous direction) of the ferrite plates 14 and a connecting bar made of a conductive metal extending in a direction perpendicular thereto. A radio wave reflector 22 composed of 20 and the rear end portions of the ferrite plate 14 are connected to each other by the radio wave reflector 22.

The connecting bar 20 of the radio wave reflector 22 is formed in a U-shaped cross section, and the rear end of the ferrite plate 14 is fitted in the groove of the connecting bar 20.

The dimensions of each part of the panel 10 of this example are as follows. That is, the size d ₁ = 600 mm, the thickness d ₂ = 8 mm, and the ferrite plate 1 of the large porcelain tile 12
4 has a thickness d ₃ = 10 mm, a depth dimension d ₄ = 30 mm, an arrangement interval d ₅ = 50 mm between the ferrite plates 14, and a concrete substrate 16 has a thickness d ₆ = 20 mm.

FIG. 3 shows an example in which a radio wave absorption wall body is constructed using this panel 10. As shown in the figure, this radio wave absorbing wall body 24 has a bar arrangement 26 on the back side of the panel 10.
It can be configured by placing concrete 28 in the state of arranging.

In the case of the panel 10 of this example, since the large-sized ceramic tile 12 as the surface decorative material, the ferrite plate 14, the concrete substrate 16 and the radio wave reflector 22 are formed as an integral unit, the radio wave absorption wall body 24. Easy to build.

Further, since the concrete substrate 16 is made of expansive concrete, when the panel 10 is manufactured, a gap is generated at the contact interface between the concrete substrate 16 and the ferrite plate 14 due to the shrinkage behavior after placing concrete, This has an advantage that cracking of the substrate 16 is suppressed.

Further, since the concrete substrate 16 does not shrink after being placed (strictly, the shrinkage rate is small or slightly expands), the concrete substrate 16 and the ferrite plate 14 are not contracted.
It has good adhesiveness with and has a strong adhesion force between them.

Radio wave absorbing wall 2 using the panel 10 of this example
In No. 4, the ferrite plate 14 is oriented in the direction perpendicular to the wall surface, not in the direction parallel to the wall surface as in the conventional case.

That is, the thickness dimension d ₃ and the depth dimension d _{4 of the} ferrite plate 14 have a relationship of d ₄ ≧ d ₃ .

It has been confirmed by the present inventors that the distance between the ferrite plates 14 and 14 can be widened while maintaining good electromagnetic wave absorption characteristics by doing so.

Therefore, if the lateral gap between the ferrite plates 14 and 14 can be widened, the large porcelain tile 1
The advantage of being able to increase the adhesion strength to the concrete wall body of No. 2 is obtained.

In the above example, the large porcelain tile 12 is used as the surface decorative material, but it is also possible to construct the panel 30 by using the small tile 32 as shown in FIGS. 4 to 6.

In this example, the tile 32 has a size of one side d ₇ = 50 mm and a thickness d ₂ = 7 mm.
The size of the entire panel 30 is d ₁ = 500 mm. The dimensions of the other parts are the same as those in the above embodiment.

Although the embodiment of the present invention has been described in detail above, this is merely an example. For example, in the present invention, it is possible to use a stone or other material as the surface decorative material, and it is also possible to apply it when performing dry construction in addition to wet construction.

When constructing the panel, the ferrite plate can be entirely buried in the concrete substrate, and the entire concrete wall body can be made of expansive concrete.

Further, in some cases, it is possible to use ordinary non-expandable concrete as the concrete substrate.
It can be configured with various modifications based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a diagram of one embodiment of the panel of the present invention.

FIG. 2 is a perspective view of the same panel.

FIG. 3 is a cross-sectional view of a radio wave absorption wall body constructed using the same panel.

FIG. 4 is a diagram of another embodiment of the panel of the present invention.

5 is a perspective view of the panel shown in FIG. 4. FIG.

FIG. 6 is a cross-sectional view of a radio wave absorption wall body constructed using the panels shown in FIGS. 4 and 5.

FIG. 7 is an explanatory diagram for explaining the background of the present invention.

[Explanation of symbols]

 10, 30 panel 12, 32 tile 14 ferrite plate 16 concrete substrate 22 radio wave reflector 24 radio wave absorption wall

Claims (3)

[Claims] 1. A radio wave formed by integrating a concrete substrate constituting a surface layer of a wall body, a radio wave absorber fixed to the surface of the wall body in a predetermined arrangement, and a decorative material arranged on the surface of the wall body. Absorption wall panel. 2. The panel for an electromagnetic wave absorbing wall according to claim 1, wherein the concrete substrate is made of expansive concrete. 3. The radio wave absorbing wall panel according to claim 1, wherein a radio wave reflector is integrally formed with the concrete substrate, the radio wave absorber and the decorative material.