JPH10112596A - Radio wave absorption wall - Google Patents

Abstract

(57) [Summary] Anchor having sufficient strength by simple construction is advantageous in terms of both production cost and transportation / storage cost, as both a ferrite plate and an exterior decorative material may have a flat plate shape without protruding portions. Be able to secure functions. SOLUTION: An anchor member 12 is protruded from a rectangular flat ferrite plate 10 and the protruding portion is a concrete layer 1.
The ferrite plate is bonded to the concrete layer so as to be buried in 4. The ferrite plate has a structure in which grooves 20 in the thickness direction are formed on both sides facing each other, and a concave portion 22 is formed on one side from the edge of the groove. The anchor member is a separate member from the ferrite plate, and has a locking piece 12a at an end. A part of the anchor member is accommodated in the groove, the locking piece is immersed in the recess, and the remaining part of the anchor member is buried in the concrete layer. Configuration to provide a horizontal hole instead of a groove,
A configuration in which a through hole is formed at the center of the ferrite plate may be used.

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 in which a rectangular flat ferrite plate is fixedly integrated with concrete. More specifically, a groove or a through-hole is formed in the ferrite plate, and an anchor member separate from the ferrite plate is attached so that a part of the anchor member is accommodated therein, and the rest is projected from the ferrite plate. The present invention relates to a radio wave absorbing wall firmly fixed to concrete by a member. The radio wave absorbing wall is used as an outer wall of a high-rise building or the like, for example, to absorb a television wave and prevent a television ghost (double image or triple image).

[0002]

2. Description of the Related Art The reflection of television waves causes ghosts on television screens. In particular, when the reflection area is large, as in a high-rise building, the influence is remarkable, and so-called electromagnetic interference (reception interference) becomes a problem. Therefore, in a high-rise building, various outer wall materials having a radio wave absorbing function are used in order to prevent the reflection of TV radio waves on the wall surface.

A typical example of the outer wall material is a radio wave absorbing precast concrete curtain wall.
This is a PC (precast / concrete) panel in which reinforcing steel is placed inside and a lightweight concrete is poured in a plate shape. A large number of ferrite plates are arranged and attached to one side of the panel. It is a structure covered with. However, since the adhesive force between the ferrite plate and the concrete is generally small, and the coefficients of thermal expansion of the ferrite plate and the concrete are different from each other, there is a possibility that the ferrite plate is peeled off from the concrete due to a temperature change.

In view of the above, a plurality of leg pieces project from the back side of the exterior decorative material, a ferrite plate is fitted between adjacent leg pieces, and a concrete layer is integrally provided on the back side thereof. A radio wave absorbing wall has been developed (see Japanese Patent Publication No. Hei 1-445238). Here, a plurality of leg pieces protruding from the back surface side of the exterior decorative material function as an anchor. In addition, there is also a configuration in which a protruding portion is provided on the back surface side of the ferrite plate itself to have an anchor function.

[0005]

In the case where a leg is protruded from the back side of the exterior decorative material, the anchor function cannot be performed unless the length of the leg is much longer than the thickness of the ferrite plate. Also, when providing a protrusion on the ferrite plate itself, if the length of the protrusion is short or the shape is too simple,
Anchor function is insufficient due to low adhesion to concrete. Therefore, in any case, the shape is complicated and the production yield is inevitably deteriorated, and there is a problem that the ferrite plate and the like are bulky due to the protruding portions, and disadvantages are caused in terms of production cost, transportation and storage cost. That is inevitable.

An object of the present invention is that both the ferrite plate and the exterior decorative material may have a flat plate shape without any protruding portion, and can basically be accommodated only by their original thicknesses, and can be manufactured and transported and stored in terms of cost. An object of the present invention is to provide a radio wave absorbing wall which is advantageous and can secure an anchor function of sufficient strength with a simple construction.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a ferrite plate having a substantially rectangular flat ferrite plate with an anchor member projecting therefrom, such that the projecting portion of the anchor member is buried in the concrete layer. Is a radio wave absorbing wall fixed to the concrete layer. Here, the features of the present invention reside in the shape of the anchor member, the structure of the mounting portion of the ferrite plate for mounting the anchor member, and the integrated structure of fixing the ferrite plate to the concrete layer by combining them. For example, the ferrite plate has a groove in the thickness direction on both sides facing each other, and has a structure in which a concave portion that is continuous from an edge of the groove is formed on one main surface of the ferrite plate. Further, the anchor member is a member separate from the ferrite plate and has a structure having a locking piece at an end. In the present invention, a part of the anchor member is housed in the groove, the locking piece of the anchor member is immersed in the recess, and the remaining part of the anchor member is projected from the other main surface of the ferrite plate and buried in the concrete layer. And integrated.

Usually, a metal mesh serving as a radio wave reflector is buried inside the concrete layer, and an exterior decorative material such as a decorative tile is attached to the surface side of the ferrite plate. The ferrite plate may be a ferrite tile (sintered product) or a compound formed from a compound. Such ferrite plates are arranged in such a manner that the opposing side surfaces are closely adhered so as to form a row according to the use condition, and the rows are arranged at equal intervals at intervals (high-rise building There are some cases (such as an outer wall of an object), and some cases (such as an anechoic chamber) such that all four sides are in close contact with (fill in) the adjacent ferrite plate.

A part of the radio wave incident on the outer wall surface is reflected on the surface of the ferrite plate. The rest passes through the ferrite plate,
The light is reflected back by the metal mesh and radiated from the ferrite plate into the space. Radio waves are transmitted through the ferrite plate,
Attenuated by ferrite magnetic loss. Also, by controlling the material properties and thickness of the ferrite plate, the radiated radio wave from the ferrite plate and the first reflected radio wave have exactly opposite waveforms,
As a result, the two cancel each other out to realize a non-reflection state.
The radio wave absorbing wall reduces the reflection of the radio wave in this way.

In the present invention, in order to mount the anchor member, instead of the groove structure formed on the side surface of the ferrite plate, a through hole structure formed at the center of the ferrite plate may be used. A configuration utilizing a lateral hole formed in the inward direction is also possible. In the case of the groove structure, it may be formed on a surface (butting side surface) that is in close contact with the adjacent ferrite plate, or may be formed on a surface (free side surface) that does not contact with the adjacent ferrite plate.

The shape and material of the anchor member are adapted to the shape of the groove or the through hole of the ferrite plate. The shape is a nail shape, a V shape or a U shape obtained by bending a strip or a wire. The material is selected from metals, synthetic resins, ceramics, ferrite, and the like. When a metal or a synthetic resin is used, if the shape is V-shaped or U-shaped, there is an advantage that the material can be temporarily fixed to the ferrite plate by utilizing the material characteristics and the morphological spring property. When the spring property cannot be used, it is also effective to temporarily hold the member by using a method such as mechanical clamping using another member or using an adhesive to enhance workability. When the anchor member has a V-shape or a U-shape, since a loop is formed in the shape and concrete enters, there is no possibility that the concrete will come off. When the anchor member is of a nail type, the round bar portion may be formed with knurls or screws, or a projection may be provided to prevent the anchor member from coming off.

According to the present invention, a part of the anchor member is buried in the concrete and is firmly bonded to the concrete.
Of course, concrete adheres to the ferrite plate,
Since the adhesive strength is not always sufficient, the anchor member has a function of supplementing it and sufficiently increasing the bonding strength. Here, the locking piece at one end of the anchor member functions to prevent the ferrite plate from separating from the anchor member bonded to the concrete. In addition, since the locking piece of the anchor member is immersed in the concave portion of the ferrite plate, it does not protrude from one main surface of the ferrite plate (the surface on which the concave portion is formed). The locking piece does not interfere, and can be closely attached to the surface of the ferrite plate.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing one embodiment of a radio wave absorbing wall according to the present invention, and is an example of a case where the present invention is applied to an outer wall of a high-rise building. In the figure, A is a plane, B is
Indicates a front face, and C indicates a side face. The radio wave absorbing wall is composed of a number of ferrite plates 1 having a substantially rectangular plate shape as a whole.
The 0s are closely attached to each other so as to form a row in the vertical direction, and the rows are arranged in the horizontal direction such that the rows are arranged at equal intervals with a gap therebetween. That is, the gaps are arranged in the direction of the electric field component (horizontal direction of the building) as viewed from the arrival direction of the television wave, and the ferrite plates 10 are arranged in rows in the direction of the magnetic field component (vertical direction of the building). An anchor member 12 is provided on the back side of each ferrite plate 10, and the ferrite plate 10 is fixedly integrated with the lightweight concrete layer 14 so that the projecting portion of the anchor member 12 is buried in the lightweight concrete layer 14.
A metal mesh 16 that also functions as a radio wave reflector is embedded in the lightweight concrete layer 14, and a decorative tile 18 is attached to the surface of the ferrite plate 10. The decorative tile 18 used here, like the ferrite plate 10, has a flat plate-like structure having no projection.

The ferrite plate 10 has grooves on both sides (upper side and lower side in FIG. 1B) opposed to each other in the thickness direction from the front surface to the back surface in the thickness direction as shown in FIG. 20 and a structure in which a concave portion 22 which is continuous from the edge of the groove 20 is formed on the surface of the ferrite plate 10. The anchor member 12 is a separate member from the ferrite plate and This is a structure having a stopper 12a. A part of the anchor member 12 is accommodated in the groove 20, and the locking piece 12 a of the anchor member 12 is immersed in the concave portion 22, and the rest of the anchor member 12 is projected from the back surface of the ferrite plate 10 so that the light-weight concrete layer 14 Buried in and integrated.

By arranging the ferrite plate 10 so as to be continuous in the direction of the magnetic field component and leave a gap in the direction of the electric field component, the material constant of the absorber (μ,
ε) can be controlled. With this configuration, a broadband radio wave absorption characteristic corresponding to a television radio wave can be obtained.

Next, several examples of the shape of various grooves and through holes formed in the ferrite plate and the structure of an anchor member to be combined therewith will be described. Broadly speaking, the ferrite plate has grooves on both sides,
There is a configuration in which side holes are provided on both side surfaces, and a configuration in which a through hole is formed in the center. The anchor member includes a nail type, a V type, a U type and the like. Various configurations are possible by their combination. 2 to 9 show an example in which a groove is formed in the side surface, FIG. 10 shows an example in which a lateral hole is formed in the side surface, and FIGS. 11 to 13 show an example in which a through hole is formed in the center.

In the example shown in FIG. 2, the ferrite plate 30
A groove 31 having a semicircular cross-section extending from one main surface to the other main surface in the thickness direction is provided at the center of both opposing side surfaces, and the groove 31 is formed on one main surface of the ferrite plate 30.
And a shallow semicircular recess 32 continuously extending from the edge of the groove 31 so as to surround the groove 31. The anchor member 33 has a disk-shaped locking piece 33 at one end of the round bar.
It is a nail-shaped shape provided with a. A part of the anchor member 33 is accommodated in the groove 31, and the locking piece 33 a of the anchor member 33 is immersed in the concave portion 32, and the rest of the anchor member protrudes from the other main surface of the ferrite plate 30 so as to be formed in the concrete layer. To be buried. In this configuration,
When the ferrite plates are continuous as indicated by a two-dot chain line, one anchor member can be configured to perform an anchoring action on the ferrite plates on both sides. Here, the groove and the concave portion are semicircular, and the anchor member is circular, but may be a corresponding square (quadrangle, hexagon, etc.).

In the example shown in FIG. 3, the ferrite plate 35
The ferrite plate 35 has a wide groove 36 having a rectangular cross section in the thickness direction of the opposing side surfaces, and a shallow groove extending continuously from one edge of the groove 36 to both sides in the groove width direction on one main surface of the ferrite plate 35. This is a structure in which a rectangular recess 37 is formed.
The anchor member 38 has a structure in which a strip made of a corrosion-resistant material is bent into a substantially V-shape as a whole, and both ends thereof are bent outward in the horizontal direction to form a locking piece 38a. A part of the anchor member 38 is housed in the groove 36, the locking piece 38 a of the anchor member 38 is immersed in the recess 37, and the rest of the anchor member protrudes from the other main surface of the ferrite plate 35. Buried inside.
In this configuration, the anchor member 38 is temporarily held by its spring property by slightly narrowing the anchor member 38 and mounting the anchor member 38 in the groove 36 and the concave portion 37 of the ferrite plate 35.
Workability is good. At the time of placing concrete, concrete enters into the inside of the V-shaped portion of the anchor member, so that the bonding strength with concrete becomes extremely high.

The example shown in FIG. 4 is an application example of FIG. 3, and shows a case where a groove is formed on the abutting surface when the ferrite plate is continuous in one direction. Since the shapes of the grooves and recesses formed in the ferrite plate may be the same as those in FIG. 3, the same reference numerals are given to the corresponding portions, and the description thereof will be omitted. In this case, the anchor member 39 is manufactured by bending a wide band plate, and has an almost V-shaped overall shape (similar to FIG. 3). Anchor member 39
Is 1 to 2 times the depth of the groove 36 of each ferrite plate 35.
Double the range. In this configuration, one anchor member 3
At 9, it can be mounted so as to straddle the two ferrite plates 35.

The example shown in FIG. 5 is a modification of FIG. The ferrite plate 40 has a groove 41 having a rectangular cross section and a wide width in the thickness direction of the opposite side surfaces thereof, and is connected to one main surface of the ferrite plate 40 from the edge of the groove 41 in the groove width direction. This is a structure in which shallow rectangular concave portions 42 extending to both sides are formed. Further, the anchor member 43 has a structure in which a wire is bent into a substantially V-shape as a whole, and both ends thereof are bent outward in the horizontal direction to form a locking piece 43a. The groove 41
And the locking piece 43a of the anchor member 43 is immersed in the recess 42, and the rest of the anchor member is projected from the other main surface of the ferrite plate 40 and buried in the concrete layer. To do.
Since a wire having a circular cross section is used as the anchor member 43, the concave portion 42 is formed in a shape that is surrounded on three sides because the wire is easily shifted.

In the example shown in FIG. 6, the ferrite plate 45
Two narrow grooves 46 each having a rectangular cross section in the thickness direction of the opposite side surfaces are provided at intervals on one side surface, and the grooves 46 are formed on one main surface of the ferrite plate 45.
And a shallow rectangular recess 47 extending from the edge of the groove to the outside of the groove width direction. The anchor member 48 has a structure in which a strip of a corrosion-resistant material is bent into a substantially U-shape, and both ends thereof are bent outward in the horizontal direction to form a locking piece 48a. A part of the anchor member 48 is accommodated in the groove 46, the locking piece 48 a of the anchor member 48 is immersed in the concave portion 47, and the remaining anchor member is protruded from the other main surface of the ferrite plate 45 to form the concrete layer. Buried inside. The anchor member may be made of a material having a spring property. Also in this configuration, at the time of placing the concrete, since the concrete enters the inside of the U-shaped portion of the anchor member, the bonding strength with the concrete is extremely high.

The example shown in FIG. 7 is a modification of FIG. The ferrite plate 50 is provided with narrow grooves 51 having a rectangular cross section and two narrow grooves on one side surface at opposite sides of the ferrite plate 50. This is a structure in which a shallow concave portion 52 extending to a portion is formed. The anchor member 53 is formed by bending a wire into a substantially U-shape as a whole, and bending both ends horizontally outward to form a locking piece 53.
a. A part of the anchor member 53 is housed in the groove 51, and a locking piece 53a of the anchor member 53 is provided.
Is immersed in the concave portion 52, and the remainder of the anchor member protrudes from the other main surface of the ferrite plate 50 and is buried in the concrete layer. Also in this case, since the wire having a circular cross section is used as the anchor member 53, it is likely to be displaced, so the concave portion 52 has a shape that is surrounded on three sides.

In the example shown in FIG. 8, the ferrite plate 55
A groove 56 having a rectangular cross section in the thickness direction and having a narrow width is provided at the center of both opposing side surfaces, and extends on one main surface of the ferrite plate 55 from the edge of the groove 56 and extends in the groove bottom direction. Such a shallow rectangular recess 57 is formed. The anchor member 58 has a structure in which the entire strip is bent into a substantially U-shape, and both ends thereof are bent inward horizontally to form locking pieces 58a. A part of both leg portions of the anchor member 58 is respectively housed in the both grooves 56, and both locking pieces 58 a of the anchor member 58 are respectively immersed in the concave portions 57 on the both side surfaces. It protrudes from the other main surface and is buried in the concrete layer. The anchor member is preferably made of a material having spring properties. This configuration also requires
Since the concrete enters the inside of the U-shaped portion of the anchor member, the bonding strength with the concrete is sufficiently high.

The example shown in FIG. 9 is a modification of FIG. The ferrite plate 60 has a structure in which a groove 61 having a semicircular cross section is provided at the center of both sides facing each other, and a concave portion 62 is formed continuously from the edge of the groove 61 and extends in the groove bottom direction. The anchor member 63 has a structure in which a wire is bent into a substantially U shape as a whole, and both ends thereof are bent inward horizontally to form a locking piece 63a. A part of the anchor member 63 is accommodated in the groove 61, the locking piece 63a is immersed in the concave portion 62, and the rest of the anchor member is projected from the other main surface of the ferrite plate 60 and buried in the concrete layer. .

In FIG. 10, the ferrite plate is shown in a half sectional state for easy understanding of the drawing. The ferrite plate 65 has a structure having an in-plane lateral hole 67 at the center of both opposing side surfaces, and the anchor member 68 is formed by bending a wire so that the whole is substantially U-shaped, and both ends are horizontally inwardly directed. And a locking piece 68a. A notch 66 is provided on the entrance side of the lateral hole 67 so as to escape when the anchor member 68 is mounted and to prevent the anchor member 68 from falling down. The locking piece 68a of the anchor member 68 is inserted into the lateral hole 67, and the remaining part of the anchor member 68 is projected from the main surface of the ferrite plate 65 and buried in the concrete layer. By providing the notch 66, even when the ferrite plates are arranged so that the groove forming surface becomes the butting surface, the anchor members can be brought into close contact with each other without obstructing the butting.

In the example shown in FIG.
Has a through hole 71 having a circular cross section in the center thickness direction, and is formed on one main surface of the ferrite plate 70 so as to continuously spread from the entire periphery of the through hole 71 so as to surround the through hole 71. This is a structure in which a shallow circular concave portion 72 is formed.
The anchor member 73 has a nail shape in which a disc-shaped locking piece 73a is provided at one end of a round bar. A part of the anchor member 73 is housed in the through hole 71 and the anchor member 7
The third locking piece 73a is immersed in the concave portion 72, and the rest of the anchor member is projected from the other main surface of the ferrite plate 70 so as to be buried in the concrete layer.

In the example shown in FIG.
Has a slot-shaped through hole 76 in the center thickness direction thereof, and has a shallow rectangular shape formed on one main surface of the ferrite plate 75 so as to continuously extend from a hole edge on both longitudinal sides of the through hole 76. This is a structure in which the concave portion 77 is formed. The anchor member 78 is made of a material having a spring property, and is formed by bending a strip having a width equal to or less than the width of the through hole 76 so that the whole is substantially V-shaped. 78a
The structure is as follows. An anchor member 78 is inserted into the through hole 76.
And a locking piece 78 of the anchor member 78
a is immersed in the concave portion 77, and the rest of the anchor member is projected from the other main surface of the ferrite plate 75 so as to be buried in the concrete layer.

The example shown in FIG. 13 is a modification of FIG.
The ferrite plate 80 has a slot-shaped through hole 81 in the center thickness direction, and one main surface of the ferrite plate 80 has
This is a structure in which a rectangular concave portion 82 is formed on both sides in the longitudinal direction of the through hole 81 so as to extend continuously from the hole edge. Further, the anchor member 83 is formed by bending a wire so as to have a substantially V-shape as a whole, and bending both ends of the anchor member 83a horizontally outward to form a locking piece 83a.
The structure is as follows. An anchor member 83 is provided in the through hole 81.
And a locking piece 83 of the anchor member 83
a is immersed in the concave portion 82, and the remainder of the anchor member is projected from the other main surface of the ferrite plate 80 so as to be buried in the concrete layer.

The ferrite plate used in the present invention may be a ferrite tile which is a sintered product, or may be a flat molded body using a compound in which ferrite grains and various binders are mixed. The material of the ferrite is, for example, Mg-Zn
A material that has been conventionally used for a radio wave absorber, such as a system, a Mn-Zn system, or a Ni-Zn system, may be used. For example, in the case of a ferrite molded body, the particle size varies depending on the binder used, the mixing ratio, and the like, but is selected, for example, from the range of about 0.1 to 5 mm. When the binder is used for an outer wall or the like, an inorganic binder such as cement, which has already been used, is preferable. However, an organic binder such as a synthetic resin or a synthetic rubber may be used depending on the application and use conditions. The mixing ratio of the ferrite grains and the binder varies depending on the particle size of the ferrite grains and the type of the binder, but when cement is used, the ferrite grains are 7 to 9 parts by weight per 1 part by weight of the binder. .
When an organic binder is used, the proportion of ferrite grains can be further increased (for example, up to about 15 parts by weight).

It goes without saying that the present invention can be applied to various radio wave anechoic chambers and the like, in addition to the radio wave absorbing wall which is attached to the outer wall of a high-rise building as described above and absorbs TV radio waves. In that case, the ferrite plates are arranged vertically and horizontally without any gap. In an anechoic chamber or the like, a ferrite plate formed using a compound using resin or rubber as a binder can be used.

[0031]

According to the present invention, as described above, a groove or a through hole is provided in a ferrite plate, and a concave portion is formed in the edge thereof. Since the anchor member is used, a part of the anchor member is housed in a groove or a through hole, the locking piece is immersed in the concave portion, and the rest of the anchor member is buried in the concrete layer. Since the strong anchor function works, the ferrite plate can be firmly bonded to the concrete layer, and there is no danger of the ferrite plate separating from the concrete. Also, since the anchor member can be easily attached to the ferrite plate, the workability is good. Further, both the ferrite plate and the exterior decorative plate may have a flat plate shape with no protruding portion, and the product yield is not deteriorated, which is advantageous in terms of manufacturing cost. Since it can be accommodated only by the thickness, it is not bulky and is advantageous in terms of transportation and storage costs.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing an example of a groove having a semicircular cross section and a nail-type anchor member.

FIG. 3 is an explanatory view showing an example of a wide groove having a rectangular cross section and a V-shaped anchor member.

FIG. 4 is an explanatory view showing an example of a ferrite plate connected state with a wide groove having a rectangular cross section and a V-shaped anchor member.

FIG. 5 is an explanatory view showing another example of a wide groove having a rectangular cross section and a V-shaped anchor member.

FIG. 6 is an explanatory diagram showing an example of a pair of narrow grooves having a rectangular cross section and a U-shaped anchor member.

FIG. 7 is an explanatory view showing another example of a pair of grooves having a narrow width and a rectangular cross section and a U-shaped anchor member.

FIG. 8 is an explanatory view showing an example of a groove having a rectangular cross section and a U-shaped anchor member.

FIG. 9 is an explanatory view showing an example of a groove having a semicircular cross section and a U-shaped anchor member.

FIG. 10 is an explanatory view showing an example of a lateral hole and a U-shaped anchor member.

FIG. 11 is an explanatory view showing an example of a circular through hole and a nail type anchor member.

FIG. 12 is an explanatory view showing an example of a slot-shaped through hole and a V-shaped anchor member.

FIG. 13 is an explanatory view showing another example of the slot-shaped through hole and the V-shaped anchor member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ferrite plate 12 Anchor member 12a Locking piece 14 Concrete layer 16 Metal mesh 18 Decorative tile 20 Groove 22 Depression

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masumi Yoshitake 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Makoto Ishikura 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Inside Electrochemical Co., Ltd.

Claims (10)

[Claims] An electromagnetic wave absorbing wall in which an anchor member protrudes from a ferrite plate having a substantially rectangular flat plate shape as a whole, and the ferrite plate is fixed to the concrete layer so that the protruding portion of the anchor member is buried in the concrete layer. The ferrite plate has a structure in which a groove in a thickness direction is formed on both opposing side surfaces thereof, and a concave portion which is continuous from an edge of the groove is formed on one main surface of the ferrite plate. The member is a member separate from the ferrite plate, has a locking piece at an end, accommodates a part of the anchor member in the groove, and causes the locking piece of the anchor member to be immersed in the recess. The remaining part of the radio wave absorption wall is projected from the other main surface of the ferrite plate, buried in the concrete layer, and fixed and integrated. 2. The groove has a semicircular cross section, and the concave portion is formed to extend in a semicircular shape so as to surround the groove.
The radio wave absorbing wall according to claim 1, wherein the anchor member has a nail shape having a disc-shaped locking piece at one end of a round bar. 3. The groove has a wide structure having a rectangular cross section.
The recess is formed on both sides in the groove width direction of the groove, and the anchor member is made of a material having a spring property, the whole is substantially V-shaped, and both ends are bent outward to form a locking piece. The radio wave absorbing wall according to claim 1. 4. The groove has a narrow width structure having a rectangular cross section,
The grooves are formed at two intervals on one side surface, the concave portions are formed at portions outside of the groove in the groove width direction, and the anchor member is made of a material having a spring property, and the whole is substantially 2. The radio wave absorbing wall according to claim 1, wherein the radio wave absorbing wall has a U-shape, and both ends of the anchor member are bent outward to form a locking piece, and a part of both legs of the anchor member is respectively accommodated in two grooves on one side. 5. The recess is formed in a groove bottom, and the anchor member is substantially U-shaped as a whole, and both ends are bent inward to form a locking piece. 2. The radio wave absorbing wall according to claim 1, wherein a part of each of the radio wave absorbing walls is housed in a groove on both sides. 6. An electromagnetic wave absorbing wall in which an anchor member protrudes from a ferrite plate having a substantially rectangular flat plate shape as a whole, and the ferrite plate is fixed to the concrete layer so that the protruding portion of the anchor member is buried in the concrete layer. The ferrite plate has a structure having in-plane lateral holes on opposite side surfaces thereof, and the anchor member is a member separate from the ferrite plate, and is made of a material having a spring property, and is substantially entirely formed. U-shaped, with both ends having locking pieces bent inward, the locking pieces of the anchor member are immersed in the side holes, and the remainder of the anchor member is projected from the main surface of the ferrite plate and buried in the concrete layer. The radio wave absorption wall that is fixed and integrated. 7. A radio wave absorbing wall in which an anchor member protrudes from a ferrite plate having a substantially rectangular flat plate shape as a whole, and the ferrite plate is fixed to the concrete layer so that the protruding portion of the anchor member is buried in the concrete layer. In the above, the ferrite plate has a through hole in the center thickness direction thereof, and has a structure in which a concave portion which is continuous from an edge of the through hole is formed in one main surface of the ferrite plate, and the anchor member is a ferrite plate. A member separate from the plate, having a locking piece at an end, accommodating a part of the anchor member in the through-hole, causing the locking piece of the anchor member to be immersed in the recess, and a remaining part of the anchor member A radio wave absorption wall that projects from the other main surface of the ferrite plate, is buried in the concrete layer, and is fixed and integrated. 8. The through hole has a circular cross section, the recess is also formed in a circular shape so as to surround the through hole, and the anchor member has a disc-shaped locking piece at one end of a round bar. The radio wave absorbing wall according to claim 7, wherein the wall has a nail shape. 9. The through hole has a slot shape, the concave portion is formed on both sides in the longitudinal direction of the through hole, and the anchor member is made of a material having a spring property.
8. The radio wave absorbing wall according to claim 7, wherein the radio wave absorbing wall is formed into a mold, and both ends thereof are bent outward to form a locking piece. 10. The exterior decorative material is provided on the main surface side of the main surface of the ferrite plate where the concave portion is formed.
The described radio wave absorption wall.