JPH10209668A - Wave absorbing wall and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave absorbing wall which has excellent construction characteristic and excellent wave absorbing characteristic in a wide band. SOLUTION: A first wave absorber layer 10 and a second wave absorber layer 11 of a specified structure are stacked by an anchor 12 which is arranged integrally in the first wave absorber layer, and a wave absorbing wall is constituted. The wave absorbing wall is installed in a surface of a concrete wall 13 by a projection part of the anchor 12. Both the wave absorber layers are constituted of an angle 14 of a specified shape and a wave absorber 15 formed fitting to a height position of the angle 14. Therefore, highly accurate dimensioning of both the wave absorber layers becomes possible. Furthermore, since both the wave absorber layers are constituted of angles of the same shape wherein an anchor hole part 14d is formed, registration of the both layers is easy during lamination by an anchor and at the same time, a wave absorbing wall can be attached to a concrete wall, thus realizing good construction characteristic.

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 and a method of manufacturing the same, and more specifically, to a radio wave absorbing wall used for a building wall or the like to prevent reflection of a radio wave of a TV or the like. The present invention relates to the manufacturing method.

[0002]

2. Description of the Related Art As a conventional radio wave absorption wall, for example, in order to take measures against television ghosts, etc.
As shown in Japanese Patent Publication No. 00 and JP-B-55-49798, a ferrite sintered body having good radio wave absorption characteristics in a VHF band or a UHF band is formed on the outer wall surface of a building (high-rise building) such as concrete. By pasting the tile,
Some of them constitute a radio wave absorption wall.

[0003] The above-mentioned invention is a basic patent,
After that, various improvements have been made. However, the tiles (ferrite sintered bodies) are used as a reference in the improvement of the layout and attachment method of the tiles made of the ferrite sintered bodies.

[0004]

However, the above-mentioned conventional ferrite sintered body using the radio wave absorbing wall has the following problems. That is, since the plane shape of the ferrite sintered body (tile) is only about 100 mm square and very small, in order to form a radio wave absorption wall,
A large number of tiles must be attached, and the attaching operation becomes very complicated.

[0005] Further, the radio wave absorption characteristics slightly change depending on the composition and dimensions of the ferrite constituting the tile. Therefore, it is necessary to determine the dimensions of the tile with high accuracy, but it is difficult to determine the dimensions accurately because the shrinkage occurs during sintering.

Therefore, in order to solve the above-mentioned drawbacks,
The present inventors have considered producing a board-shaped radio wave absorber by mixing ferrite powder into concrete and casting the concrete into a mold having a predetermined shape. This makes it possible to manufacture a relatively large-sized one such as a PC board, which facilitates construction. Then, a mesh is buried in the middle part of the radio wave absorption band to prevent concrete peeling or the like.

In order to manufacture a radio wave absorber having such a configuration, the radio wave absorber is placed in a mold having a predetermined shape up to an intermediate position in the height direction.
Cast concrete containing ferrite powder. Next, a mesh for increasing the strength is arranged on the surface of the concrete, and thereafter, the same type of concrete as described above is poured over the mesh to the height of the formwork, and is dried and solidified.

The radio wave absorber formed by the above-mentioned manufacturing method is formed in the shape according to the mold, so that the dimensioning becomes highly accurate and the radio wave absorption characteristics are not deteriorated. The problem is solved. However, in order to bury the mesh inside, concrete is divided into two parts as described above, and the mesh is further arranged between them. Therefore, a total of three steps are required, and the manufacturing process becomes complicated.

Further, in order to arrange the mesh at the center in the height direction, the first concrete placement must be performed to a half position in the height direction. It is difficult to control the amount of casting accurately, and the mesh cannot be arranged at a desired position. In addition, 1
In order to secure the joint strength between the concretes to be poured in the first and second times, the second concrete must be poured when the first concrete is in a semi-solid state.
Then, the mesh placed on the semi-solidified concrete will sink into the concrete due to the weight of the concrete. Therefore, it is more difficult to arrange the mesh at a predetermined position, and the strength of the manufactured radio wave absorber varies.

Further, the band having good radio wave absorption characteristics in the radio wave absorber wall using the concrete containing the ferrite component is narrower than the band in the radio wave absorption wall of the ferrite sintered body. . Therefore, if the required frequency band is wide, it is necessary to stack a plurality of radio wave absorbers having different radio wave absorption characteristics. In such cases,
In order to secure the connection strength of each layer, a predetermined amount of concrete is poured into a single relatively deep formwork, and then, when the concrete is in a semi-solid state, another type of concrete having a different radio wave absorption characteristic. Will be cast.

However, in this case, the same problem as in the case of the first and second concretes to be cast above and below the mesh when manufacturing one radio wave absorbing wall occurs, and the thickness of each layer is reduced. Control cannot be performed accurately, and as a result, desired characteristics may not be obtained. Further, since the concrete becomes thicker, it takes time to completely solidify the inside and the production efficiency is poor.

Further, since the material of the radio wave absorber is concrete, if such a radio wave absorption wall is used, if cracks or cracks occur, such a portion is likely to be peeled off. Disappears.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and has as its object to solve the above-mentioned problems, to be excellent in workability, and to make dimensioning highly accurate. An object of the present invention is to provide a radio wave absorption wall which can easily perform a manufacturing process, is excellent in safety, and has good radio wave absorption characteristics in a wide band, and a method for manufacturing the same.

[0014]

In order to achieve the above-mentioned object, a radio wave absorbing wall according to the present invention comprises a radio wave absorber formed by forming concrete or mortar mixed with ferrite powder in a predetermined board shape, An angle embedded in the radio wave absorber, wherein the angle extends in the thickness direction of the radio wave absorber, and a plurality of legs having the same length as the thickness thereof; A mesh plate integrally connected at a middle position in the direction, wherein the mesh plate is provided with a plurality of through holes and an anchor hole for inserting an anchor. Further, a hole for inserting the anchor is further provided at a predetermined position of the radio wave absorber facing the hole for the anchor (claim 1).

[0015] The anchor of the anchor hole here refers to a fixture used when a radio wave absorbing wall is driven into, for example, a concrete wall of a PC panel or the like. It is a hole provided for passing a mounting device. Further, the ferrite powder can be produced, for example, by pulverizing a ferrite sintered body.

As another solution, a first radio wave absorber layer having the same structure as the radio wave absorption wall according to claim 1 and concrete or mortar mixed with ferrite powder are formed in a predetermined board shape. Radio wave absorber made
And a second radio wave absorber layer having an angle embedded in the radio wave absorber. The angle of the second radio wave absorber layer extends in the thickness direction of the radio wave absorber and has the same length as the thickness thereof. A plurality of legs, and a mesh plate integrally connected to a longitudinally intermediate position of the legs, wherein the mesh plate has a plurality of through holes and an anchor for inserting an anchor. A hole for inserting the anchor at a predetermined position of the radio wave absorber facing the anchor hole, and a predetermined number of holes are provided in the first radio wave absorber layer having the above configuration. The second radio wave absorber layer is laminated and the anchor is inserted into the hole for inserting the anchor, and the respective radio wave absorber layers are joined to each other to improve the radio wave absorption characteristics of the radio wave absorber constituting each radio wave absorber layer. The difference is made (claim 2).

Preferably, one end of the anchor is inserted into the anchor hole of the angle forming the first radio wave absorber layer, and the anchor hole of the angle forming the second radio wave absorber layer is provided. A hollow pipe having an inner shape corresponding to the outer shape of the other end of the anchor protruding from the first radio wave absorber layer is installed in the portion, and the other end of the anchor is inserted into the hollow pipe, whereby each radio wave absorption is performed. That is, the body layers are joined (claim 3). Although the hollow pipe is formed of a member different from the angle in the embodiment, the hollow pipe may be formed of the same member by integral molding.

In the method for manufacturing a radio wave absorbing wall according to the present invention,
The angle according to claim 1 is arranged in a first mold having a predetermined depth, and one end of an anchor having a predetermined shape is inserted and arranged in an anchor hole provided in the angle with the other end protruding. Then, concrete or mortar mixed with ferrite powder is poured into the first formwork in a scraped state (claim 4). Preferably, a decorative plate is arranged on the bottom surface side of the first formwork, and thereafter, the above-described processing is performed (claim 5).

As another solution, the first radio wave absorber layer is formed by the manufacturing method of claim 4 or 5.
An angle with a hollow pipe as defined in claim 3 is supplied into a separately formed second formwork, and concrete or mortar mixed with ferrite powder is poured into the second formwork in a scraped-off state. A radio wave absorber layer is formed. Then, using the first radio wave absorber layer and the predetermined number of second radio wave absorber layers manufactured in the separate process, the other end of the anchor is moved to the second position.
You may make it insert in the hollow pipe of a radio wave absorber layer (claim 6).

In the radio wave absorbing wall according to the first aspect, the radio wave absorber, which is concrete mixed with ferrite powder,
For example, dimensionalization can be performed with high precision by, for example, scraping off the upper end of the formwork or forming it in accordance with the height of the angle.

In addition, the angle is configured such that the mesh plate is integrally attached to the middle of the height positions of the plurality of legs, so that the predetermined position is maintained, and the concrete or mortar is meshed (through holes) of the mesh plate. When the radio wave absorber filled with the both sides of the mesh plate in the mold and reaches the height of the angle, the mesh plate is automatically located at the middle portion of the radio wave absorber. Therefore, the manufactured electromagnetic wave absorber layer can maintain good strength, and peeling of concrete or the like is suppressed as much as possible by the mesh plate.

According to the second aspect of the present invention, when the radio wave absorption characteristics are made different in each radio wave absorber layer, the radio wave absorption wall as a whole has the radio wave absorption characteristics of each radio wave absorber layer. The combined characteristics are obtained, and there are many good portions and the band that can be absorbed is widened.

Further, as in the radio wave absorbing wall according to the third aspect, when the radio wave absorber layers are laminated, the anchor holes formed in each angle are aligned in the coaxial direction. Therefore, the positions of the radio wave absorber layers are automatically adjusted by passing the anchor through each anchor hole.

As a method for manufacturing each of the above radio wave absorbing walls,
As described in claim 4, by arranging the angle in a mold having a predetermined shape, the amount of flowing concrete or mortar mixed with ferrite powder is controlled according to the height of the mold. Therefore, manufacturing is easy, and dimensioning is performed with high accuracy.

According to the fifth aspect of the present invention, the decorative board is firmly bonded and integrated with concrete and mortar when the concrete and mortar are dried and solidified. In addition, a separate work for attaching a decorative board is not required.

According to the sixth aspect of the present invention, not only can the production be performed in a short time, but also the concrete can be cast into each mold in a scraped-off manner, so that the thickness of each radio wave absorber layer can be reduced. The thickness can be accurately formed.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a radio wave absorbing wall according to the present invention will be described. As shown in FIG. 1, a first radio wave absorber layer 10 and a second radio wave absorber layer 11 having a predetermined structure having different radio wave absorption characteristics are provided by an anchor 12 integrally disposed on the first radio wave absorber layer 10. They are arranged one on top of the other to form a radio wave absorbing wall. The anchor 12 is longer than the combined thickness of the first radio wave absorber layer 10 and the second radio wave absorber layer 11, and the protruding portion of the anchor 12 is embedded in the concrete wall 13 constituting the outer wall of the building. The radio wave absorbing wall is installed on the surface of the concrete wall 13. The surface of the concrete wall 13 is a concrete-side surface of a PC panel or the like.

Here, the structure of the radio wave absorber layer, which is a main part of the present invention, is a radio wave absorber made of concrete or mortar mixed with ferrite powder (in this embodiment, mortar is used) formed in a board shape. Then, an angle for supporting the mold of the radio wave absorber layer is embedded.

As shown in FIG.
Are 4 of the same length, which are arranged upright at the rectangular vertices.
It is composed of a leg portion 14a of the book and a flat net-like plate 14b connected to an intermediate position (a bisecting position) in the height direction of the leg portion 14a. The length of each leg 14a is equal to the height of the radio wave absorber layer to be formed. Also, the mesh plate 14
b is a plurality of through-holes 1 having elongated openings on the upper and lower surfaces thereof.
4c are provided to form a mesh, and near the four corners (near the leg 14a) of the mesh plate 14b, an anchor hole 1 having a predetermined diameter is provided.
4d is formed.

In the present embodiment, in order to facilitate the formation of the angle 14 and further increase the strength, a resin is used as the material of the angle 14 (the leg 14a and the mesh plate 14b), and the angle 14 is integrally formed. Although formed, in the present invention, the material of the angle 14 need not be limited to resin as long as the shape processing is easy and the strength is strong.

A flat rectangular prism having the leg portion 14a as a side of each side has an outer shape of each radio wave absorber layer.
4 and integrated.

That is, as shown in FIG. 1, the angle 14 is disposed inside a radio wave absorber 15 made of mortar mixed with ferrite powder. As is apparent from FIG. 2, the through hole 14c provided in the angle 14 and the anchor hole 14d are not formed on the same plane.
Since it is necessary to explain both parts, the cross-sectional position (the original drawing is omitted) is bent, and the cross sections of the through hole 14c and the anchor hole 14d are shown in the same plane.

As shown in the figure, the radio wave absorber 15 is provided in the through hole 14 c provided in the angle 14 and in the mesh plate 14.
b into the space formed on both the upper and lower sides,
A radio wave absorber layer of a virtual quadrangular prism partitioned by 4a is formed. That is, the thickness of the radio wave absorber 15 is
Height of the leg 14a. The basic configuration is the same for both the first and second radio wave absorber layers 10 and 11.

The anchor 12 is arranged so that the first radio wave absorber layer 10 located on the front surface side penetrates the inner hole of the anchor hole 14 c of the mesh plate 14 b constituting the angle 14. The anchor 12 is composed of a first anchor portion 12a having a large diameter (one end portion in the claims) 12a and a second anchor portion 12a having a small diameter (the other end portion in the claims), and the first anchor portion 12a Is fixed inside the anchor hole 14d, and is inserted and fixed in the hole 15a of the radio wave absorber 15. Further, a decorative plate 16 is adhered to the outer surface of the first radio wave absorber layer 10 (the side opposite to the joint surface with the second radio wave absorber layer 11).

The anchor hole 1 provided in the mesh plate 14b of the angle 14 constituting the second radio wave absorber layer 11
A hollow pipe 17 is inserted and arranged in 4 d and in the hole 15 a of the radio wave absorber 15. The inner diameter of the hollow pipe 17 is set substantially equal to the outer diameter of the second anchor portion 12b of the anchor 12. The anchor holes 14d provided in the angles 14 used for the first and second radio wave absorber layers 10 and 11 are aligned with each other.
When the legs 14a are joined together, they are located coaxially.

Then, the second anchor portion 12b of the anchor 12 integrally disposed on the first radio wave absorber layer 10 is
By penetrating the inside of the hollow pipe 17 arranged in the radio wave absorber layer 11, the first radio wave absorber layer 10 and the second radio wave absorber layer 11 are combined to form a radio wave absorption wall having a two-layer structure. .

By making the length of the second anchor portion 12b longer than the thickness of the second radio wave absorber layer 11, the tip of the second anchor portion 12b penetrates through the second radio wave absorber layer 11. There are protrusions. Then, the radio wave absorbing wall formed by integrating the two radio wave absorber layers by the projecting portion is cast on the concrete wall 13.

By embedding the projecting portion of the second anchor portion 12b in the concrete wall 13 as described above, the radio wave absorbing wall is firmly installed on the concrete wall 13 and the first radio wave absorbing layer 10 and the concrete wall 13 are used. Since the second radio wave absorber layer 11 is sandwiched, the first radio wave absorber 10 and the second radio wave absorber layer 11 are not separated.

At this time, by changing the material of each of the above-described radio wave absorber layers, the radio wave absorption characteristics can be improved over a wide band. For example, the ferrite powder mixed into the mortar forming the first radio wave absorber layer 10 and the second radio wave absorber layer 11 is made of Mg and Mn, respectively, so that the radio wave absorption wall is made of the radio wave absorber layer using Mn. And a band in which the radio wave absorption characteristics of the radio wave absorber layer using Mg are good. In other words, the radio wave absorption wall according to the present invention can have good radio wave absorption characteristics over a wide band. In addition to changing the ferrite material as described above, even if the mixing amount is changed or the thickness of each layer is changed, the radio wave absorption characteristics can be changed, so that the characteristics according to the required radio wave absorption characteristics can be obtained. The material, mixing amount, shape, etc. are changed as appropriate.

Next, a method of manufacturing the radio wave absorbing wall having the above structure will be described. FIGS. 3A and 3B are diagrams for explaining a method of manufacturing the first radio wave absorber layer and the second radio wave absorber layer constituting the radio wave absorption wall, respectively. As shown in FIG. 1A, a decorative plate 16 having a uniform thickness is arranged on the bottom surface of a first mold 20 having a concave portion of a predetermined shape (planar rectangular shape).
An angle 14 is arranged above the angle. Since the anchor hole 14d is formed in the mesh plate 14b of the angle 14, the first anchor portion 12a, which is a component of the anchor 12, is penetrated through the inside of the anchor hole 14d. Then, the anchor 12 is placed upright.
At this time, the height of the first anchor portion 12a is the angle 14
Is formed in advance so as to be equal to the height.

Further, the depth of the concave portion of the first mold 20 is made equal to the value obtained by adding the height of the leg portion 14a of the angle 14 to the thickness of the decorative plate 16 (this state is changed from the state shown in the drawing). (Corresponding to the mortar 15 removed). Further, the four legs 14 of the angle 14 are provided at the four corners of the concave portion of the first formwork 20.
a is located. That is, the outer shape of the virtual square pillar formed by each of the legs 14a and the inner shape of the concave portion of the first mold 20 match.

Then, a mortar mixed with a predetermined ferrite powder is poured into the first mold 20 from above, and the upper portion of the mortar is scraped off on the upper surface of the first mold 20 to make the height uniform.
At this time, since the through hole 14c is formed in the mesh plate 14b, the mortar enters the lower surface side of the mesh plate 14b through the through hole 14c. Therefore, the mortar fills the space (the portion where the angle 14 does not exist) formed in the concave portion of the first mold 20, and its thickness matches the height of the mold by fraying. Therefore, the radio wave absorber 15 is formed by molding into the same shape as the concave portion and drying and solidifying the mortar. Then, by removing the first mold 20 after the drying and solidification, the first radio wave absorber layer 10 is formed.

Further, since the mortar can be filled and supplied below the mesh plate 14b in a state where the mesh plate 14b is arranged, unlike the case where an independent mesh is supplied, the mortar needs to be cast only once, thereby increasing the work efficiency. I can do it.

Further, the mesh plate 14b is formed integrally with the angle 14, and is located at the middle of the height of the angle 14, so that it is automatically placed at the middle of the height of the radio wave absorber 15. Is done. Further, since the mortar is held by the legs 14a, it does not sink even if the mortar is in an unsolidified state, and holds a predetermined position.

Furthermore, in this example, the decorative plate 16 was previously arranged on the bottom surface of the first mold 20 and the mortar was cast in that state. Therefore, the adhesive force of the radio wave absorber 15 generated when the mortar was dried and solidified. Thereby, the decorative board 16 is firmly adhered. Therefore, the bonding strength is increased as compared with the conventional structure of bonding with a resin adhesive, and the workability is also improved because such a bonding step is not required.

Next, a method of manufacturing the second electromagnetic wave absorber layer 11 will be described. As shown in FIG. 4B, the angle 14 is disposed in a second mold 21 having a recess having a predetermined shape. Next, the anchor hole portion 1 provided in the mesh plate 14b.
Inside the 4d, a hollow pipe 17 having a length equal to the height of the angle 14 is inserted and arranged. 2nd formwork 2 used at this time
In 1, the depth of the concave portion is equal to the leg portion 14 a of the angle 14, and its planar shape matches the rectangle having the leg portion 14 a of the angle 14 as a vertex.

Then, in the same manner as the method of forming the first electromagnetic wave absorber layer 10, the mortar mixed with the predetermined ferrite powder from above (the mortar filled in the first Are made of different materials) up to the height of the second formwork. At this time, since the hollow pipe 17 has the same length as the height of the angle 14, the mortar does not enter the inside of the hollow pipe 17. Then, the upper surface of the mortar is scraped off in accordance with the height of the angle 14, and the mortar is dried and solidified to form the second radio wave absorber layer 11 with high accuracy in dimensioning.

Also in this case, since the shape of the angle 14 is the same as that of the angle forming the first radio wave absorber layer, the mesh plate 14b is automatically located in the middle of the second radio wave absorber layer 11. In addition, the mortar can be filled in the second mold 21 that is filled to below the mesh plate 14b and does not have the angle 14 by a single mortar casting.

Since the above-described method for forming the first radio wave absorber layer and the step for forming the second radio wave absorber layer are performed using separate molds, both steps can be performed simultaneously. Therefore, the manufacturing time of the radio wave absorbing wall according to the present invention can be reduced.

Then, the first radio wave absorber layer 10 and the second radio wave absorber layer 11 formed by the above-mentioned method are integrated together to produce a radio wave absorption wall. Specifically, referring to FIG. 1, the first radio wave absorber layer 10
Second anchor portion 12 of anchor 12 integrally installed in
b is passed through a hollow pipe 17 provided integrally with the second radio wave absorber layer 11 to integrate the two.

At this time, since the angles 14 constituting the first radio wave absorber layer 10 and the second radio wave absorber layer 11 have the same shape, the holes for both anchors provided in both net-like plates 14b are used. The positions of the parts 14c are equal in the coaxial direction. Therefore, the arrangement positions of the hollow pipe 17 and the second anchor portion 12b are equal. That is, the positioning of the first radio wave absorber layer 10 and the second radio wave absorber layer 11 is automatically performed by inserting an anchor, and a radio wave absorption wall whose dimensions are highly accurate is formed. Furthermore, since the first radio wave absorber layer 10 and the second radio wave absorber layer 11 are formed separately from each other, the thicknesses of the respective layers also become highly accurate, and good radio wave absorption characteristics can be obtained.

By the way, in this embodiment, both the radio wave absorber layers are manufactured by using different molds, respectively, and they are integrated. However, in order to manufacture the radio wave absorption wall having the structure of FIG. However, the present invention is not limited to this. For example, as shown in FIG. 4, it is conceivable to use a mold 23 having a relatively deep concave portion and manufacture both radio wave absorber layers using the single mold 23. That is, the form 23 has a shape obtained by adding the height of the angle 14 to the height of the first form 20 described above.
A decorative plate 16, an angle 14, and an anchor 12 are mounted in a predetermined positional relationship in the same manner as in the above-described manufacturing process of the first electromagnetic wave absorber layer 10, and then a mortar containing ferrite powder of a predetermined material up to the height of the angle 14. Is installed.

Next, an angle 14 with a hollow pipe 17 is mounted in the protruding second anchor portion 12b, and a mortar containing ferrite powder having a different structure from the above is cast in that state. At the top edge of the
Make the thickness uniform. After the cast mortar is dried and solidified, the mold 23 is removed to form a radio wave absorber in which the first and second radio wave absorber layers are laminated.

However, in this method, the second radio wave absorber layer cannot be manufactured until the first radio wave absorber layer is manufactured. (1) When manufacturing a radio wave absorber layer, a predetermined amount of mortar is cast, but at this time, it may not be possible to form a desired thickness accurately according to the height of the angle because the mortar cannot be cut off. There is.

Further, when the mortar for the second radio wave absorber layer is cast in a semi-solid state, the mortar of the first radio wave absorber layer that has been cast earlier is compressed by the weight of the mortar that has been cast. And the thickness changes. Therefore, for the above various reasons, the above-described embodiment is more preferable as the manufacturing process.

In this embodiment, two radio wave absorber layers are attached to concrete. However, the radio wave absorption wall according to the present invention may have two or more radio wave absorber layers. Can form a radio wave absorbing wall by forming a connection portion of the anchor even longer and stacking a plurality of radio wave absorber layers having the same structure as the second radio wave absorber layer. By increasing the number of stacked radio wave absorber layers in this manner, the band of radio wave absorption characteristics that can be satisfactorily handled can be further expanded. That is, the radio wave absorber layer
The radio wave absorption characteristics can be further improved as compared with the case of a layer.

On the contrary, only one layer may be provided, and in such a case, it is constituted only by the first radio wave absorber layer. The anchor does not need to be thin on the distal end side as described above, and may be of the same diameter or of a larger diameter at an arbitrary portion over the entire length. Furthermore, the hollow pipe may be formed integrally instead of being formed as a separate member from the angle as in the above-described example. Needless to say, concrete may be cast instead of mortar.

[0058]

As described above, the radio wave absorbing wall according to the present invention uses concrete or mortar mixed with ferrite in the radio wave absorber which is a main constituent material of the radio wave absorbing wall. Is placed in a mold, the dimensional accuracy can be improved, a radio wave absorber having a desired shape can be manufactured, and a desired radio wave absorption characteristic can be obtained. In addition, the shape can be made larger than that of the conventional tile made of ferrite sintered body, and the anchor is integrally formed, so that it can be attached to the outer wall of the building via the anchor. And the workability is good.

Since the angle is composed of a leg for determining the size and shape of the radio wave absorber layer and a mesh plate which is integrally arranged in the middle of the height position of the leg, the mesh plate is formed as follows. It is automatically placed in the middle of the radio wave absorber (wave absorber layer). In addition, since it is a net-like plate, even after the angle has been installed, if concrete or the like is cast from above, it can be supplied downward through the through-hole, so that the casting is only one step, and it is necessary to manufacture the radio wave absorbing wall. Such labor and manufacturing time can be reduced.

Further, by setting the formation position of the anchor hole formed in the angle to a predetermined position, when the anchor is inserted into the hole, the positioning of each radio wave absorber layer is automatically performed, and the workability is improved. It will be good.

Further, since the angle forms the outer frame of the radio wave absorber layer, even if cracks or cracks occur in the radio wave absorption wall, the radio wave absorber adheres to the angle and is hard to peel off. Therefore, safety is improved.

When a plurality of radio wave absorber layers are laminated, the radio wave absorption characteristics of each radio wave absorber layer are made different,
As a whole, the radio wave absorption wall has a band in which the radio wave absorption characteristics of each radio wave absorber layer are good, and can have a good radio wave absorption characteristic over a wide band.

The anchor attached to the first radio wave absorber layer is passed through a hollow pipe attached to the second radio wave absorber layer, and both radio wave absorber layers are mounted on a concrete wall of a PC panel. Since the second wave absorber layer is sandwiched and fixed between the wave absorber layer and the concrete wall,
The first radio wave absorber layer and the second radio wave absorber layer are hard to separate,
The safety after installing the radio wave absorption wall on the concrete wall is good.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a radio wave absorbing wall according to the present invention.

FIG. 2 is a view showing angles used for a radio wave absorber layer constituting a radio wave absorption wall according to the present invention.

FIG. 3A is a view for explaining a method of manufacturing a first radio wave absorber layer constituting a radio wave absorption wall according to the present invention.
(B) is a figure for demonstrating the manufacturing method of the 2nd electromagnetic wave absorber layer which comprises the electromagnetic wave absorption wall which concerns on this invention.

FIG. 4 is a diagram showing a comparative method for explaining advantages of the method for manufacturing a radio wave absorbing wall of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st radio wave absorber layer 11 2nd radio wave absorber layer 12 Anchor 12a 1st anchor part (one end) 12b 2nd anchor part (other end) 14 Angle 14a Leg 14b Mesh plate 14c Through hole 14d Anchor hole Part 15 Radio wave absorber 15a Hole 17 Hollow pipe 20 First mold 21 Second mold

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Inagaki 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Masumi Yoshitake 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Inside Electrochemical Co., Ltd. (72) Inventor Makoto Ishikura 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Hideo Tanaka 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Wignaraja Shiva Kumaran 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Tetsuo Yamada 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Inside Construction Co., Ltd. (72) Inventor Masao Kosaka 31-2, Yoyogi, Shibuya-ku, Tokyo Showa Mining Science Co., Ltd. (72) Inventor Akira Matsuyama Ichihara, Ichihara, Chiba Thu 891-5

Claims (6)

[Claims] 1. A radio wave absorber (15) formed by forming concrete or mortar mixed with ferrite powder in a predetermined board shape, and an angle (1) embedded and arranged in the radio wave absorber.
4), wherein the angle extends in the thickness direction of the radio wave absorber, and is integrally connected to a plurality of legs (14a) having the same length as the thickness, and intermediate positions in the longitudinal direction of the legs. Mesh plate (1
4b), wherein the mesh plate has a plurality of through holes (14c) and an anchor (1).
2) An anchor hole (14d) for inserting the anchor is provided, and a hole (15a) for inserting the anchor is provided at a predetermined position of the radio wave absorber facing the anchor hole. A radio wave absorbing wall characterized by that. 2. A radio wave formed by forming a first radio wave absorber layer (10) having the same configuration as the radio wave absorption wall according to claim 1 and concrete or mortar mixed with ferrite powder in a predetermined board shape. Absorber (15)
And a second radio wave absorber layer (11) having an angle (14) embedded in the radio wave absorber. The angle of the second radio wave absorber layer is in the thickness direction of the radio wave absorber. Has a plurality of legs having the same length as the thickness thereof, and a mesh plate integrally connected to a longitudinally intermediate position of the legs, wherein the mesh plate has a plurality of through holes, An anchor hole for inserting an anchor is provided, and a hole for inserting the anchor is provided at a predetermined position of the radio wave absorber facing the anchor hole. A predetermined number of second radio wave absorber layers are laminated on the radio wave absorber layer, and an anchor is inserted into a hole for inserting an anchor to join each radio wave absorber layer, and each radio wave absorber layer is formed. Radio wave absorber characterized by having different radio wave absorption characteristics of different radio wave absorbers Wall. 3. One end (1) of an anchor (12) is inserted into an anchor hole of the angle constituting the first radio wave absorber layer.
2a) is inserted, and the anchor (1) protruding from the first radio wave absorber layer is inserted into the anchor hole of the angle constituting the second radio wave absorber layer.
A hollow pipe (17) having an inner shape matching the outer shape of the other end (12b) of 2) is installed, and the other end of the anchor is inserted into the hollow pipe to position each radio wave absorber layer. The radio wave absorbing wall according to claim 2, wherein the radio wave absorbing wall is joined. 4. An angle according to claim 1 is disposed in a first mold (20) having a predetermined depth, and one end of an anchor having a predetermined shape is inserted into an anchor hole provided in the angle. A method for manufacturing a radio wave absorbing wall, comprising: inserting and arranging a ferrite powder-mixed concrete or mortar inside the first formwork in a worn-out state. 5. The method for manufacturing a radio wave absorbing wall according to claim 4, wherein a decorative plate is arranged on a bottom surface side of said first formwork, and thereafter, each of the above-mentioned processes is performed. 6. The first method according to claim 4 or 5,
The angle with a hollow pipe for the second electromagnetic wave absorber layer according to claim 3 is supplied into a second mold (21) formed with a radio wave absorber layer and separately formed, and a ferrite is formed inside the mold. Concrete or mortar mixed with powder is laid in a scraped state to form a second radio wave absorber layer, and the first radio wave absorber layer manufactured in the separate process and a predetermined number of second radio wave absorber layers are used. A method for manufacturing a radio wave absorbing wall, wherein the other end of the anchor is inserted into a hollow pipe of a second radio wave absorber layer.