JP2002081011A - Electronic wave absorber for road surface, method of manufacturing it, and method of executing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic wave absorber for a road surface capable of exhibiting a desired wave absorption characteristic even if installed on a road surface, without decreasing the mechanical strength of the road surface. SOLUTION: The electronic wave absorber 10 for a road surface comprises a wave absorption layer 11 for absorbing electric waves 20; a wave reflector 12 installed on the side of the layer 11 opposite to the side on which the waves 20 are incident for reflecting the waves 20; and a road surface material for securing the strength of the road surface. The wave absorber includes a base layer 13 positioned on the side of the layer 11 opposite to the wave incidence side. The layer 11 contains a wave absorbing material in particle or powder form, aggregate in particle or powder form, and a binder for binding the wave absorbing material and the aggregate together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorber for a road surface used for suppressing reflection of radio waves on a road surface of a road.

[0002]

2. Description of the Related Art Recently, attention has been paid to intelligent transportation systems. This system includes an automatic toll collection system (E
It is also called TC (Electronic Toll Collection System). ) And millimeter-wave radar systems.

The automatic toll collection system automatically collects tolls by wirelessly and bidirectionally communicating information on tolls between a roadside antenna and an on-vehicle unit-side antenna of a vehicle-mounted unit mounted on a vehicle. It is a system that performs. In this system, the roadside antenna is installed at a gate of a tollgate, an indicator installed on the road, or the like, and radiates radio waves from above to a car passing through the gate.

On the other hand, a millimeter-wave radar system uses a millimeter-wave radar mounted on a car,
This system detects the situation around the car and supports safe driving such as collision prevention.

[0005]

When an automatic toll collection system is employed, radio waves radiated from a roadside antenna are transmitted between the road surface of the road and the toll booth or the lower surface of the upper road. There is the possibility of multiple reflections between them. As a result, the reach of radio waves above the threshold value that can be received by the on-board unit antenna is wider than the target range, and within this reach, multiple vehicles traveling on the same lane or multiple adjacent lanes can enter. However, there is a problem that the system may malfunction. Even in the millimeter wave radar system, there is a possibility that the system malfunctions due to the reflection of radio waves on the road surface or the like.

Therefore, it is conceivable to install a radio wave absorber on the road surface. In this case, the radio wave absorber installed on the road surface is required to have a specific performance such that the radio wave absorption characteristics do not deteriorate even when installed on the road surface and the mechanical strength of the road surface is not reduced.

Therefore, as a radio wave absorber installed on a road surface, an electromagnetic wave absorbing asphalt panel material disclosed in JP-A-11-163590, a TV frequency band radiowave absorber disclosed in JP-A-4-63499, and the like are disclosed. It is conceivable to use a radio wave absorbing type precast wall plate disclosed in Japanese Utility Model Publication No. 6-48951. However, all of the structures disclosed in these publications have the following problems when used with a radio wave absorber installed on a road surface.

An electromagnetic wave absorbing asphalt panel material disclosed in JP-A-11-163590 includes an asphalt containing a carbon material and, if necessary, a synthetic rubber;
It is formed by laminating a plurality of plate-shaped or sheet-shaped shield materials by kneading an aggregate, sand, and metal powder such as aluminum cutting powder. According to the description in the above-mentioned publication, all three types of asphalt panel materials in the working examples are 0.1 asphalt panel materials.
Having a sufficiently small electrical resistivity of 1 mΩ or less,
About 20 to 50 d as shown in FIGS.
B has the electromagnetic wave shielding effect. However, the above publication does not describe the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing asphalt panel material. Because this fact and the above publication consistently describe only an electromagnetic wave absorbing asphalt panel material having an electromagnetic wave shielding effect as an effect of the electromagnetic wave absorbing asphalt panel material, the electromagnetic wave absorbing asphalt panel material shown in the above publication is only an electromagnetic wave shielding asphalt panel material. It is considered that the material does not have radio wave absorption performance. This can be inferred from the fact that the electromagnetic wave absorbing asphalt panel material is formed by kneading not only carbon-based materials but also metal powder having a large radio wave reflection amount.

[0009] Japanese Patent Application Laid-Open No. 4-63499 discloses a T
The radio wave absorber for the V frequency band is configured by embedding a wire mesh as a conductor in a molded body mainly made of cement and magnetic powder. However, such a radio wave absorber using cement and magnetic particles as main raw materials has a problem in that radio wave absorption characteristics deteriorate due to penetration of water. For this reason, this radio wave absorber cannot be applied to a road surface exposed to rainfall or the like. Further, in this radio wave absorber, when the frequency becomes a high frequency of 1 GHz or more, there is a possibility that radio wave absorption characteristics may be significantly reduced due to penetration of water.
For this reason, it is difficult to use this radio wave absorber for countermeasures against obstacles caused by electromagnetic waves such as a frequency (5.8 GHz) used in an automatic toll collection system and a frequency (77 GHz) used in a millimeter wave radar system.

A radio wave absorbing type precast wallboard disclosed in Japanese Utility Model Publication No. 6-48951 is a fiber-reinforced concrete wall reinforced with conductive high-strength fibers and having a thin metal layer provided inside, and a fixed metal layer. It has a plurality of ferrite members arranged at intervals and is integrally formed with an exterior material made of concrete reinforced with non-conductive fibers. However, since this radio wave absorbing type precast wall plate has a structure in which a plurality of ferrite members are arranged at regular intervals inside, when used on a road surface, due to bending and vibration of the road surface accompanying the passage of the vehicle, There is a problem that the ferrite member is damaged, and as a result, electromagnetic continuity in the ferrite member is lost, and radio wave absorption characteristics may be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a radio wave absorber for a road surface which can exhibit desired radio wave absorption characteristics even when installed on a road surface and does not reduce the mechanical strength of the road surface. And a manufacturing method and a construction method thereof.

[0012]

A radio wave absorber for a road surface according to the present invention is provided with a radio wave absorbing layer for absorbing radio waves and a radio wave reflection layer for reflecting the radio waves, the radio wave absorbing layer being disposed on the side opposite to the radio wave arrival side in the radio wave absorbing layer. It is provided with a body and a base layer made of a road surface material for securing the strength of the road surface and arranged on a side of the radio wave absorbing layer opposite to a radio wave arrival side.

In the radio wave absorber for road surface according to the present invention, the radio wave absorption layer can be designed and manufactured so as to obtain desired radio wave absorption characteristics independently of the base layer, and a desired mechanical property can be obtained by the base layer. Strength can be obtained.

In the radio wave absorber for road surface according to the present invention, the radio wave absorption layer, the radio wave reflector and the base layer may be laminated and integrated so that the entire radio wave absorber for road surface has a flat plate shape.

Further, in the radio wave absorber for road surface according to the present invention, the radio wave absorbing layer comprises a particulate or powdery radio wave absorbing material, a particulate or powdery aggregate, a radio wave absorbing material and a binder for fixing the aggregate. May be included.

The radio wave absorbing material may include a magnetic material. In this case, the radio wave absorbing material may be sintered magnetic particles obtained by firing particles of a magnetic powder formed to have a desired particle diameter. Further, the radio wave absorbing material may be sintered magnetic particles formed so as to have a desired particle size by pulverizing a sintered magnetic material larger than a desired particle size. Further, the radio wave absorbing material may be a particle formed by coating a particle made of a magnetic substance powder formed to have a desired particle diameter with a coating material. Further, the radio wave absorbing material may be particles formed to have a desired particle size by a mixture of a magnetic substance powder and a binder.

The radio wave absorbing material may include a dielectric loss body. In this case, the radio wave absorbing material may be particles formed by coating particles made of a dielectric loss powder formed to have a desired particle diameter with a coating material.
Further, the radio wave absorbing material may be particles formed to have a desired particle size by a mixture of a powder of a dielectric loss body and a binder.

The binder may be asphalt or a cold-setting resin. The cold-setting resin may include an epoxy resin.

In the radio wave absorber for road surface according to the present invention, the radio wave reflector may be made of a single material.

In the radio wave absorber for road surface according to the present invention, the radio wave reflector may include a single material and a binder for bonding the material to at least one of the radio wave absorbing layer and the base layer. Good. Further, in the road surface radio wave absorber of the present invention, the radio wave reflector is a plurality of radio wave reflection materials,
A binder for fixing the plurality of radio wave reflecting materials may be included. In this case, the radio wave reflector may further include an aggregate. The binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin. The plurality of radio wave reflecting materials may be one type of radio wave reflecting material or a plurality of types of radio wave reflecting materials.

Further, in the radio wave absorber for road surface of the present invention, the radio wave reflector may include a material in which carbon fibers are formed in a sheet shape.

In the radio wave absorber for road surface according to the present invention, the radio wave reflector may have rust resistance.

In the radio wave absorber for road surface according to the present invention, the base layer may include a particulate or powdery aggregate and a binder for binding the aggregate. In this case, the binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin.

In the radio wave absorber for road surface according to the present invention, the base layer may also serve as a radio wave reflector. In this case, the base layer may include a particulate or powdery aggregate, a plurality of radio wave reflecting materials, and a binder for fixing the aggregate and the radio wave reflecting material. The base layer is
It may include a particulate or powdery aggregate, a plurality of radio wave reflecting materials disposed near the surface of the base layer on the radio wave arrival side, and a binder for fixing the aggregate and the radio wave reflecting material. Further, the base layer may have rust resistance. The binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin. In addition, multiple radio wave reflection materials,
One type of radio wave reflecting material may be used, or a plurality of types of radio wave reflecting materials may be used.

In the radio wave absorber for road surface according to the present invention, the base layer may be at least a part of a road surface layer of an existing road.

In the radio wave absorber for road surface according to the present invention, both the radio wave absorbing layer and the base layer have water repellency, and the radio wave reflector is covered with the radio wave absorbing layer and the base layer so as not to be exposed to the outside. May be.

[0027] In the radio wave absorber for road surface according to the present invention, the radio wave absorption layer, the radio wave reflector and the base layer are laminated and integrated so that the entire radio wave absorber for road surface has a flat plate shape. In addition, the road surface radio wave absorber may further include a water-repellent coating layer that covers the periphery of the integrated radio wave absorption layer, the radio wave reflector, and the base layer. In this case, the coating layer includes a constituent material including at least one of the plurality of aggregates and the plurality of fillers, and a binder that holds them together, and the weight ratio of the binder to the constituent material is 1
It may be 5% or more and 500% or less. The binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin. The plurality of aggregates may be one type of aggregate or a plurality of types of aggregate. Similarly, the plurality of fillers may be one type of filler or a plurality of types of filler.

In the radio wave absorber for road surface according to the present invention, at least the radio wave absorbing layer among the radio wave absorbing layer, the radio wave reflector and the base layer may have water permeability. In this case, at least the radio wave absorbing layer of the radio wave absorbing layer having water permeability, the radio wave reflector and the base layer includes a particulate or powdery constituent material and a binder for binding them,
The weight ratio of the binder to the constituent materials is 2% to 20%.
It may be as follows. The binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin. The particulate or powdery constituent material includes an aggregate, a radio wave absorbing material or a radio wave reflecting material.

In the radio wave absorber for road surface according to the present invention, at least one of the radio wave absorbing layer, the radio wave reflector and the base layer may have water repellency. In this case, at least one of the water-repellent radio wave absorbing layer, the radio wave reflector and the base layer includes a particulate or powdery constituent material and a binder for fixing the constituent materials, and a weight ratio of the binder to the constituent material. Is 15% or more and 100%
It may be as follows. The binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin. The particulate or powdery constituent material includes an aggregate, a radio wave absorbing material or a radio wave reflecting material.

The radio wave absorber for road surface according to the present invention may further comprise a water-repellent coating layer surrounding at least one of the radio wave absorbing layer, the radio wave reflector and the base layer. In this case, the coating layer includes a constituent material including at least one of the plurality of aggregates and the plurality of fillers, and a binder for binding the constituent materials, and a weight ratio of the binder to the constituent material is 15% or more and 500% or less. Is also good. The binder may be asphalt or cement. Further, the binder may be a cold-setting resin. The cold-setting resin may include an epoxy resin. The plurality of aggregates are 1
A different kind of aggregate may be used, or a plurality of kinds of aggregate may be used. Similarly, the plurality of fillers may be one type of filler or a plurality of types of filler.

In the radio wave absorber for road surface according to the present invention, the radio wave absorbing layer may be composed of a plurality of stacked layers. In this case, each layer constituting the radio wave absorption layer may have at least one of an electromagnetic constant and a thickness different from each other. The radio wave absorbing layer may include a layer that does not include a radio wave absorbing material.

The first method of manufacturing a radio wave absorber for road surface according to the present invention comprises a radio wave absorbing layer for absorbing radio waves, and a radio wave reflecting layer disposed on the radio wave absorbing layer on the side opposite to the radio wave arrival side to reflect radio waves. A radio wave absorber for a road surface, comprising a body, and a base layer made of a road surface material for securing the strength of the road surface and disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer; A method for manufacturing a radio wave absorber for a road surface, wherein the radio wave reflector and the base layer are laminated and integrated so that the whole of the radio wave absorber for a road surface has a flat plate shape. And a step of forming the base layer independently, placing a radio wave reflector on one surface of the base layer, further mounting a radio wave absorption layer thereon, and integrating the radio wave absorption layer, the radio wave reflector and the base layer And a process.

According to the second method of manufacturing a radio wave absorber for road surface of the present invention, a radio wave absorbing layer for absorbing radio waves and a radio wave reflecting layer arranged on the side opposite to the radio wave arrival side in the radio wave absorbing layer for reflecting radio waves A radio wave absorber for a road surface, comprising a body, and a base layer made of a road surface material for securing the strength of the road surface and disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer; A method of manufacturing a radio wave absorber for a road surface in which a radio wave reflector and a base layer are laminated and integrated so that the entire radio wave absorber for a road surface has a flat plate shape. And forming a base layer by placing a radio wave reflector on one surface of the radio wave absorption layer and placing a road surface material thereon to form the base layer. And a step of integrating the base layer. That.

The first method of constructing a radio wave absorber for road surface according to the present invention comprises a radio wave absorbing layer for absorbing radio waves, and a radio wave reflecting layer disposed on the radio wave absorbing layer on the side opposite to the radio wave arrival side to reflect radio waves. A method for constructing a road surface radio wave absorber comprising a body, a road surface material for securing road surface strength, and a base layer disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer, The method includes a step of sequentially laminating a base layer, a radio wave reflector and a radio wave absorbing layer on a road, and a step of paving a road with the base layer, the radio wave reflector and the radio wave absorbing layer.

According to a second method of constructing a radio wave absorber for road surface of the present invention, a radio wave absorbing layer for absorbing a radio wave and a radio wave reflecting layer arranged on the side opposite to the radio wave arriving side in the radio wave absorbing layer for reflecting the radio wave A method for constructing a road surface radio wave absorber comprising a body, a road surface material for securing road surface strength, and a base layer disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer, Digging down the existing road surface to a depth equivalent to the thickness of the road surface radio wave absorber, forming a storage part for installing the road surface radio wave absorber, and installing the road surface radio wave absorber in the storage part And a process.

The third method of constructing a radio wave absorber for road surface according to the present invention comprises a radio wave absorbing layer for absorbing radio waves, and a radio wave reflecting layer disposed on the radio wave absorbing layer on the side opposite to the radio wave arrival side to reflect radio waves. A method for constructing a road surface radio wave absorber comprising a body, a road surface material for securing road surface strength, and a base layer disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer, The method includes a step of fixing a road surface radio wave absorber on an existing road surface with an adhesive.

According to a fourth method for constructing a radio wave absorber for road surface of the present invention, a radio wave absorbing layer for absorbing radio waves and a radio wave reflecting layer arranged on the side opposite to the radio wave arriving side in the radio wave absorbing layer for reflecting radio waves. A radio wave absorber for a road surface, comprising a body, and a base layer made of a road surface material for securing the strength of the road surface and disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer; A method in which a radio wave reflector and a base layer are constructed such that a radio wave absorber for a road surface is laminated and integrated so that the entire radio wave absorber for a road surface has a flat plate shape, and a radio wave absorber for an adjacent road surface is used. A step of arranging a plurality of road surface radio wave absorbers on a road so that a gap is formed therebetween, and a step of filling the gap with a road surface material.

In the fourth method for constructing a radio wave absorber for road surface of the present invention, the road surface material may have water permeability. In this case, a base layer having water permeability may be provided below the road surface radio wave absorber.

According to a fifth method for constructing a radio wave absorber for road surface of the present invention, a radio wave absorbing layer for absorbing a radio wave and a radio wave reflecting layer arranged on the side opposite to the radio wave arrival side in the radio wave absorbing layer for reflecting the radio wave A method for constructing a road surface radio wave absorber comprising a body, a road surface material for securing road surface strength, and a base layer disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer, A step of embedding an anchor in a base layer of a road surface radio wave absorber, and a step of fixing the road surface radio wave absorber to an existing road surface or a base layer on which the road surface radio wave absorber is installed by the anchor. .

According to a sixth aspect of the present invention, there is provided a method for constructing a radio wave absorber for road surface, comprising: a radio wave absorbing layer for absorbing a radio wave; A method for constructing a road surface radio wave absorber comprising a body, a road surface material for securing road surface strength, and a base layer disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer, The radio wave reflector in the road surface radio wave absorber,
By extending to the side of the radio wave absorption layer and the base layer, and fixing the extended portion of the radio wave reflector to the existing road surface or the base layer on which the road surface radio wave absorber is installed, the radio wave absorber for road surface And a step of installing the vehicle on a road.

According to a seventh aspect of the present invention, there is provided a method of constructing a radio wave absorber for road surface, comprising: a radio wave absorbing layer for absorbing radio waves; A method for constructing a road surface radio wave absorber comprising a body, a road surface material for securing road surface strength, and a base layer disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer, The method includes a step of sequentially stacking a radio wave reflector and a radio wave absorbing layer on a road surface layer of an existing road which also serves as a base layer.

In the seventh method for constructing a radio wave absorber for road surface according to the present invention, the radio wave reflector may include a material in which carbon fibers are formed in a sheet shape. In the step of sequentially laminating the radio wave reflector and the radio wave absorbing layer on the road surface layer, an adhesive is applied on the road surface layer, and a material in which carbon fibers are formed in a sheet shape is disposed thereon, and this material is used. An adhesive may be further applied on the substrate, and a radio wave absorbing layer may be formed thereon.

[0043]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, with reference to FIG. 3, an outline of a road surface radio wave absorber according to an embodiment of the present invention and an automatic toll collection system to which the radio wave absorber is applied will be described.

FIG. 3 is an explanatory diagram showing an example of a configuration around a tollgate in an automatic toll collection system to which the present embodiment is applied. In this example, under toll booth 1
A roadside antenna 2 in the automatic toll collection system is provided. In the automatic toll collection system, the toll collection is automatically performed by wirelessly communicating information about tolls between the roadside antenna 2 and the on-board unit antenna of the on-board unit 4 mounted on the car 3. It is supposed to do. The roadside antenna 2 emits a radio wave toward the road 5 where the tollgate is installed.

In such a situation, when the radio wave absorber for road surface according to the present embodiment is not used, the radio wave radiated from the roadside antenna 2 is transmitted to the road surface of the road 5 and the toll booth 1 There is a possibility that multiple reflections occur with the lower surface of the light source. As a result, the arrival range of the radio wave equal to or greater than the threshold value that can be received by the on-vehicle unit antenna in the on-vehicle unit 4 is wider than the target range, and the traveling range of the same lane or a plurality of adjacent lanes within the reach range Multiple cars may enter and the system may malfunction. In order to prevent this, the road surface radio wave absorber 10 according to the present embodiment is installed, for example, on the road surface ahead of the traveling direction of the radio wave radiated from the roadside antenna 2.

Next, the structure of the radio wave absorber 10 for road surface according to the present embodiment will be described with reference to FIG. FIG.
1 is a cross-sectional view of a road surface radio wave absorber 10.

The radio wave absorber for road surface (hereinafter, also simply referred to as radio wave absorber) 10 according to the present embodiment includes a radio wave absorbing layer 11 that absorbs radio waves 20 and an arrival side of the radio waves 20 in the radio wave absorbing layer 11. And a base layer which is arranged on the opposite side to the electric wave 20 and reflects a radio wave 20, and a road surface material for securing road surface strength, and which is arranged on the opposite side of the electric wave absorption layer 11 from the electric wave arrival side. 13 is provided. The radio wave absorber 10 is configured by laminating a base layer 13, a radio wave reflector 12, and a radio wave absorption layer 11 in this order from the bottom.

As shown in FIG. 2, the radio wave absorber 10
The radio wave absorbing layer 11, the radio wave reflector 12, and the base layer 13 are
The radio wave absorber 10 may be formed into a transportable block shape or panel shape by laminating and integrating the radio wave absorber 10 so as to form a flat plate as a whole. By forming the radio wave absorber 10 in such a form, transportation and installation of the radio wave absorber 10 are facilitated.

Next, the radio wave absorbing layer 11 will be described in detail with reference to FIG. FIG. 4 is an enlarged sectional view showing a part of the radio wave absorbing layer 11. The radio wave absorbing layer 11 includes a radio wave absorbing material 21 in a particulate or powder form, a particulate or powdery aggregate 22, a radio wave absorbing material 21 and an aggregate 2
And a binder 23 for retaining the two. When the radio wave absorbing layer 11 has such a configuration, the radio wave absorbing layer 1
1 can exhibit desired radio wave absorption characteristics and a function as a road surface. The function as a road surface has desired slip resistance and abrasion resistance.

The radio wave absorbing material 21 contains at least one of a magnetic material and a dielectric loss material. The magnetic body may be a ferrite or metal magnetic body. Dielectric loss bodies are carbon black, carbon graphite, carbon fiber,
Alternatively, metal oxide fibers may be used. The aggregate 22 is made of, for example, a dielectric, and is made of crushed stone, gravel, quartz sand, hard magnetic aggregate, cement, concrete, hard plastic, or a mixture thereof. As the binder 23, for example, asphalt or a cold-setting resin is used. The cold-setting resin may be an epoxy resin.

When the radio wave absorbing material 21 is in the form of particles, the shape may be a sphere, a flat sphere, a cylinder, a cylinder, a polygonal prism (including a cube or a rectangular parallelepiped), a polygonal pyramid, or a cone.

Here, with reference to FIGS. 5 to 9, some examples of the form of the radio wave absorbing material 21 when the radio wave absorbing material 21 includes a magnetic material and a method of forming them will be described.

The radio wave absorbing material 21 of the example shown in FIG.
The sintered magnetic particles 212 as shown in FIG. The sintered magnetic particles 212 are formed by sintering particles 211 of a magnetic powder formed to have a desired particle diameter as shown in FIG. In this example, the particle diameter of the sintered magnetic particles 212 is slightly smaller than the particle diameter of the particles 211 due to sintering of the magnetic powder.

The radio wave absorbing material 21 of the example shown in FIG.
The sintered magnetic particles 214 as shown in FIG. The sintered magnetic particles 214 are formed to have a desired particle size by crushing a sintered magnetic material 213 larger than the desired particle size as shown in FIG. In this example, as the sintered magnetic body 213, defective products such as a deflection yoke core, a transformer core, a bead core made of ferrite, and waste materials can be used.

The radio wave absorbing material 21 of the example shown in FIG.
As shown in (b), the particles 215 made of a magnetic material powder formed to have a desired particle diameter are coated with the coating material 216.
Particles 217 formed by coating with the particles. The particles 217 are formed by coating particles 215 made of a magnetic material powder as shown in FIG.
16 is formed by curing. Coating material 21
As 6, for example, asphalt, cement, or a normal-temperature-curable resin is used. The cold-setting resin may be an epoxy resin. In this example, the particle diameter of the particles 217 is larger than the particle diameter of the particles 211 by the thickness of the coating material 216.

The radio wave absorbing material 21 in the example shown in FIG.
As shown in (b), particles 2 formed to have a desired particle size by a mixture of a magnetic substance powder and a binder
19 The particles 219 are formed by kneading a magnetic powder and a binder as shown in FIG.
Is formed so as to have a desired particle size and cured.

The radio wave absorbing material 21 of the example shown in FIG.
As shown in (c), particles 2 formed to have a desired particle size by a mixture of a magnetic substance powder and a binder
21. The particles 221 are manufactured as follows. First, a mixture 218 obtained by kneading a powder of a magnetic substance and a binder as shown in (a) is formed into a rod shape by a method such as pressing or extrusion, and is cured to form a rod-shaped magnetic substance 220. . Next, the rod-shaped magnetic body 220 is cut to form pellet-shaped particles 221 having a desired particle diameter. For the production of the particles 221, an existing plastic pellet production line can be diverted.

As the binder in the example shown in FIG. 8 or the example shown in FIG. 9, for example, asphalt, cement, or a cold-setting resin is used. The cold-setting resin may be an epoxy resin.

Next, some examples of the form of the radio wave absorbing material 21 when the radio wave absorbing material 21 includes a dielectric loss body and a method of forming them will be described. The radio wave absorbing material 21 may be a particle formed by coating a particle made of a dielectric loss powder formed to have a desired particle diameter with a coating material. Radio wave absorbing material 21 in this case
Can be formed by using a dielectric loss material powder instead of the magnetic material powder in the example shown in FIG. Further, the radio wave absorbing material may be particles formed to have a desired particle size by a mixture of a powder of a dielectric loss body and a binder. In this case, the method of forming the radio wave absorbing material 21 may be such that the dielectric material powder is used instead of the magnetic material powder in the example shown in FIG. 8 or the example shown in FIG.

Next, the radio wave reflector 12 will be described in detail. The radio wave reflector 12 may be formed of a single material. The radio wave reflector 12 may include a single material and a binder for bonding the material to at least one of the radio wave absorbing layer 11 and the base layer 13. In these cases, the single material may be a metal mesh, a metal plate, a metal plate having a plurality of holes, a conductive mesh, a carbon fiber sheet, or a film formed of a conductive paint. The carbon fiber sheet is a material in which carbon fibers are formed into a sheet shape, and is a one-way material, a two-way fabric,
Any of a triaxial woven fabric and a carbon fiber nonwoven fabric may be used. As the binder, for example, asphalt, cement, or a room temperature-curable resin is used. The cold-setting resin may be an epoxy resin.

FIG. 10 is a sectional view showing an example of the configuration of the radio wave reflector 12. As shown in FIG. As shown in FIG.
2 may include a plurality of radio wave reflecting materials 31 and a binder 32 for fixing the plurality of radio wave reflecting materials 31. The radio wave reflection material 31 may be in the form of particles or powder. Further, the radio wave reflecting material 31 may be metal particles, metal powder, metal wire, metal fiber, carbon black, carbon graphite, carbon fiber, or a mixture thereof. The plurality of radio wave reflecting materials 31
Various types of radio wave reflection materials may be used, or a plurality of types of radio wave reflection materials may be used. As the binder 32, for example, asphalt, cement, or a normal-temperature-curable resin is used. The cold-setting resin may be an epoxy resin.

FIG. 11 is a sectional view showing another example of the configuration of the radio wave reflector 12. As shown in FIG. As shown in FIG. 11, the radio wave reflector 12 includes a plurality of radio wave reflection materials 33 and a plurality of aggregates 34.
And a binder 35 for fixing the radio wave reflection material 33 and the aggregate 34. Radio wave reflection material 33
And the aggregate 34 may be in the form of particles or powder, respectively. The material of the radio wave reflection material 33 is the same as the radio wave reflection material 31 in FIG. Multiple radio wave reflection materials 3
3 may be a single type of radio wave reflecting material or a plurality of types of radio wave reflecting materials. The material of the aggregate 34 is the same as that of the aggregate 22 in FIG. The plurality of aggregates 34 may be one type of aggregate or a plurality of types of aggregate. Binder 3
The material No. 5 is the same as the binder 32 in FIG.

The radio wave reflector 12 may have rust resistance. In order for the radio wave reflector 12 to have rust resistance, for example, the radio wave reflection material in the radio wave reflector 12 may be formed of stainless steel.

Next, the base layer 13 will be described in detail. The base layer 13 may include a particulate or powdery aggregate and a binder for retaining the aggregates.
The material of the aggregate and the binder in this case is the same as the aggregate 22 in FIG. 4 and the binder 32 in FIG.

The base layer 13 may also serve as the radio wave reflector 12. In this case, the base layer 13 may include a plurality of radio wave reflecting materials 31 and a binder 32 for fixing the plurality of radio wave reflecting materials 31, similarly to the configuration of the radio wave reflector 12 shown in FIG. Radio wave reflection material 31
May be in the form of particles or powder. The plurality of radio wave reflecting materials 31 may be a single type of radio wave reflecting material or a plurality of types of radio wave reflecting materials. When the base layer 13 also serves as the radio wave reflector 12, the input impedance viewed from the radio wave arrival side surface of the base layer 13 is not a short-circuit state in which the input impedance is completely zero, but a quasi-short state in which the input impedance is sufficiently small. You may. In this case, the radio wave absorber 10 may be designed and manufactured in consideration of the input impedance.

FIG. 12 is a cross-sectional view showing an example of the configuration of the base layer 13 also serving as the radio wave reflector 12. As shown in FIG. 12, the base layer 13 is made of a particulate or powdery aggregate 4.
1, a plurality of radio wave reflecting materials 42, and a binder 43 for fixing the aggregate 41 and the radio wave reflecting materials 42. The radio wave reflecting material 42 may be in the form of particles or powder. The material of the aggregate 41 is the same as the aggregate 22 in FIG. The material of the radio wave reflection material 42 is shown in FIG.
Is the same as that of the radio wave reflection material 31. The plurality of radio wave reflection materials 42 may be one type of radio wave reflection material or a plurality of types of radio wave reflection materials. The material of the binder 43 is the same as the binder 32 in FIG.

FIGS. 13 and 14 show another example of the structure of the base layer 13 which also serves as the radio wave reflector 12. FIG. FIG.
Is a cross-sectional view showing the vicinity of the surface of the base layer 13 on the radio wave arrival side, and FIG. 14 is a plan view showing the surface of the base layer 13 on the radio wave arrival side. As shown in these figures, the base layer 1
3 is a particulate or powdered aggregate 41 and a base layer 13
May include a plurality of radio wave reflecting materials 42 arranged near the surface on the radio wave arrival side of the above, and a binder 43 for fastening the aggregate 41 and the radio wave reflecting material 42.

When the base layer 13 also serves as the radio wave reflector 12, the base layer 13 may have rust resistance.
Thereby, it is possible to prevent the base layer 13 also serving as the radio wave reflector 12 from being rusted. In order to make the base layer 13 have rust resistance, for example, the radio wave reflection material in the base layer 13 may be formed of stainless steel.

Further, the base layer 13 may be at least a part of a road surface layer constituting a road surface of an existing road. In this case, the radio wave absorber 12 and the radio wave absorption layer 11 may be sequentially laminated on the road surface layer of the existing road to form the radio wave absorber 10, or a part of the road surface layer of the existing road. The radio wave reflector 12 and the radio wave absorption layer 11 are sequentially laminated on the remaining road surface layer so that
0 may be configured.

In the radio wave absorber 10 according to the present embodiment, when the radio wave reflector 12 does not have rust resistance, FIG.
As shown in FIG. 5, both the radio wave absorbing layer 11 and the base layer 13 have water repellency and the radio wave reflector 12
The radio wave reflector 12 may be covered with the radio wave absorbing layer 11 and the base layer 13 so as not to be exposed to the outside.
Thereby, the radio wave reflector 12 can be prevented from being rusted.

When the radio wave absorber 10 is configured as shown in FIG. 15, the radio wave reflector 12 has a size having a necessary radio wave reflection amount. For this purpose, the width d of the region formed near the end of the radio wave absorber 10 where the radio wave reflector 12 does not exist is determined by the wavelength λ of the radio wave in the sample.
g is preferably 1/16 or less, and more preferably 1/32 or less of the wavelength λg.

When the radio wave reflector 12 does not have rust resistance, as shown in FIG. 16, the radio wave absorbing layer 11, the radio wave reflector 12, and the base layer 13 integrated in a block or panel shape. A coating layer 51 having water repellency while maintaining the mechanical characteristics as a member constituting the road surface may be provided so as to cover the periphery of the vehicle. Thereby, the radio wave reflector 12 can be prevented from being rusted.

The covering layer 51 may include a constituent material containing at least one of a plurality of aggregates and a plurality of fillers, and a binder for fixing the constituent materials. In this case, the weight ratio of the binder to the constituent materials is preferably 15% or more and 500% or less. As a filler,
There are calcium carbonate, fumed silica, glass powder and the like. The binder material is the binder 3 in FIG.
Same as 2. The plurality of aggregates may be one type of aggregate or a plurality of types of aggregate. Similarly, the plurality of fillers may be one type of filler or a plurality of types of filler.

The radio wave absorber 10 according to the present embodiment
In, at least the radio wave absorbing layer 11 of the radio wave absorbing layer 11, the radio wave reflector 12, and the base layer 13 may have water permeability while maintaining mechanical properties as a member constituting a road surface. This makes it possible to prevent water from accumulating on the road surface. The radio wave absorbing layer 11, the radio wave reflector 12, or the base layer 13 having water permeability may include a particulate or powdery constituent material and a binder for binding the constituent materials. The particulate or powdery constituent material includes an aggregate, a radio wave absorbing material or a radio wave reflecting material. In this case, the weight ratio of the binder to the constituent materials is preferably 2% or more and 20% or less. 20% weight ratio of binder to constituent materials
If the ratio exceeds 2, the water permeability becomes small. If the weight ratio of the binder to the constituent material is less than 2%, the water permeability is good but the mechanical properties as a member constituting the road surface cannot be maintained. In order to form a layer having water permeability while maintaining the mechanical properties as a member constituting the road surface, the weight ratio of the binder to the constituent material in the layer must be 5%.
% Or more and 15% or less.

When the radio wave reflector 12 is a metal mesh, the mesh interval decreases as the frequency of the radio wave increases. That is, the mesh interval for functioning as the radio wave reflector 12 is about 1 of the wavelength λg in the sample.
It is 1/0 or less. Therefore, the higher the frequency of the radio wave, the more the radio wave reflector 12 is moved to the radio wave absorbing layer 11 and the
3 and particles, powders, and binders constituting the radio wave absorbing layer 11 or the base layer 13 clog the metal mesh which is the radio wave reflector 12 and increase the water permeability of the radio wave reflector 12. It becomes difficult to secure. Therefore, in order to support the radio wave reflector 12 having a wavelength λg of 50 mm or less in the sample and having water permeability, the radio wave reflector 12 has a configuration in which a radio wave reflection material is bonded by a binder. At the same time, it is preferable that the weight ratio of the binder in the radio wave reflector 12 is 2% or more and 20% or less.

The radio wave absorber 10 according to the present embodiment
In, at least one of the radio wave absorbing layer 11, the radio wave reflector 12, and the base layer 13 may have water repellency while maintaining mechanical properties as a member constituting a road surface. Thereby, the radio wave absorbing layer 11, the radio wave reflector 1
It is possible to prevent the performance of the radio wave absorber 10 from deteriorating due to the penetration of water into the base 2 or the base layer 13. Radio wave absorbing layer 11 having water repellency, radio wave reflector 12
Alternatively, the base layer 13 may include a particulate or powdery constituent material and a binder for binding the constituent materials. The particulate or powdery constituent material includes an aggregate, a radio wave absorbing material or a radio wave reflecting material. In this case, the weight ratio of the binder to the constituent materials is 15%.
It is preferably at least 100%.

The radio wave absorber 10 according to the present embodiment
In the case where at least one of the radio wave absorbing layer 11, the radio wave reflector 12 and the base layer 13 has a weight ratio of 2% or more to 20% or less with respect to the constituent material of the binder, that is, if it has water permeability, A water-repellent coating layer may be provided so as to cover the periphery of the layer having water repellency while maintaining the mechanical properties as a member constituting the road surface. Thereby, the radio wave absorber 10 can be configured to have water repellency. The material of the coating layer is the same as that of the coating layer 51 in FIG.

Incidentally, in the radio wave absorber 10 according to the present embodiment, the radio wave absorption layer 11 may be composed of one layer as described above, but is composed of a plurality of laminated layers. It may be. FIG.
7 shows an example in which the radio wave absorbing layer 11 is constituted by two layers 11A and 11B.

When the electromagnetic wave absorbing layer 11 is composed of a plurality of layers, each layer constituting the electromagnetic wave absorbing layer 11 has at least an electromagnetic constant (complex relative permittivity, complex relative permeability) and a thickness. One may be different.

When the radio wave absorbing layer 11 is composed of a plurality of layers, the radio wave absorbing layer 11 includes a layer containing no radio wave absorbing material, for example, a layer obtained by mixing only an aggregate and a binder. Is also good.

When the radio wave absorption layer 11 is composed of a plurality of layers, the radio wave absorption performance can be broadened (to achieve good radio wave absorption characteristics in a wider frequency band) and the angle can be increased (a wider incident angle range). Realizing good radio wave absorption characteristics). However, by designing the radio wave absorber 10 (radio wave absorbing layer 11) in consideration of the input impedance viewed from the radio wave arrival side surface, the electromagnetic constants (complex relative permittivity,
It is necessary to determine the complex relative magnetic permeability) and the thickness. Note that good radio wave absorption characteristics mean that a return loss of 15 dB or more, preferably a return loss of 20 dB or more is obtained.

Next, with reference to FIG. 18 and FIG. 19, a method of designing the radio wave absorber 10 when the radio wave absorber 10 according to the present embodiment is installed on an existing road surface layer will be described. 18 and 19 show the existing road surface layer 100.
2 shows an electric equivalent circuit of the radio wave absorber 10 including the base layer 13, the radio wave reflector 12, and the radio wave absorption layer 11 provided thereon.

First, referring to FIG. 18, the existing road surface layer 10
0, the radio wave arrival of the k-th layer when the base layer 13 and the radio wave absorption layer 11 are treated as a dielectric layer or a magnetic layer or a mixed layer of a dielectric and a magnetic material, and the radio wave reflector 12 is treated as a dielectric layer. An impedance (that is, input impedance) _Zink ^* (* indicates a complex number) _viewed from the side surface is obtained.

In this case, as shown in FIG.
The characteristic impedance between (air) is Z₀And free space
The wavelength of the radio wave at₀And the surface of the radio wave absorber 10
Θ is the incident angle of radio waves to
ε_rk ^*And the complex relative magnetic permeability of the k-th layer is μ_rk ^*And the k-th layer
The thickness of d_kAnd the characteristic impedance of the k-th layer is Z_Ck ^*
And the impedance from the surface of the k-1th layer
-Dance Z_ink-1 ^*And the propagation constant of the k-th layer is γ_k ^*(=
j · (2π / λ₀) √ (ε_rk ^*μ_rk ^*-Sin^Twoθ))
You.

In the case where the k-th layer is other than the resistance layer, that is, in this example, the existing road surface layer 100, the base layer 13 and the radio wave absorbing layer 11 are replaced with a dielectric layer or a magnetic layer or a mixed layer of a dielectric and a magnetic substance. When the radio wave reflector 12 is treated as a dielectric layer, the impedance Z _ink ^* _viewed from the radio wave arrival side surface of the k-th layer is expressed by the following equation (1).

[0086] _{^{Z ink * = Z Ck * (}} Z ink-1 * + Z Ck * tanhγ k * d k) / (Z Ck * + Z ink-1 * tan hγ k * d k) ... (1)

Here, when the incident radio wave is a TE wave (the electric field is polarized perpendicular to the incident surface), Z _Ck ^* = Z _{0 μrk} ^* / _rk (ε
_rk ^* _μrk ^* −sin ² θ), and when the incident radio wave is a TM wave (polarization whose magnetic field is perpendicular to the incident surface), Z _Ck ^* = Z ₀ √
(Μ _rk ^* ε _rk ^* −sin ² θ) / ε _rk ^* .

Next, referring to FIG. 19, when the k-th layer is treated as a resistance layer, that is, in this example, when the radio wave reflector 12 is treated as a resistance layer, the k-th layer is viewed from the radio wave arrival side surface. _{Find the} impedance Z _ink ^* . The impedance Z _ink ^{* in} this case is expressed by the following equation (2).

Z _ink ^* = R _k · Z _ink-1 ^* / (R _k + Z _ink-1 ^* ) (2)

Here, R _k is the sheet resistance (unit: Ω □) of the k-th layer. Note that the impedance Z _ink ^* of the existing road surface layer 100, the base layer 13, and the radio wave absorbing layer 11 is expressed by the following equation (1).
It is represented by

From the recurrence formulas (1) and (2), the impedance Z _inmax ^* _seen from the radio wave arrival side surface of the radio wave absorber 10 (the radio wave absorption layer 11) is obtained. In this example, max = 3.

From the impedance Z _inmax ^* , the reflection coefficient _{ＴＥ TE} ^* for the TE wave and the reflection coefficient ＴＭ for the TM wave Γ
_TM ^* is determined as follows.

{ _TE ^* = {Z _inmax ^* -(Z ₀ / cos θ)}}
/ {Z _inmax ^* + (Z ₀ / cos θ)}

Γ _TM ^* = (Z _inmax ^* −Z ₀ cos θ) / (Z
_inmax ^* + Z _{0 cosθ)}

Further, the return loss S is obtained as follows.

S = −20 log | Γ ^* |

[0097] It should be noted, Γ ^* is a Γ _TE ^* or Γ _TM ^*.

Here, for example, if | Γ ^* | is designed to be 0.1 or less, the return loss S will be 20 dB or more.

When the base layer 13 also functions as the radio wave reflector 12, it is sufficient to design the above-mentioned design method except for the radio wave reflector 12. When the existing road surface layer 100 also serves as the base layer 13, the base layer 1
3 can be designed. Further, when the radio wave absorbing layer 11 is composed of a plurality of layers, it is possible to design by increasing the number of layers in the radio wave arrival direction and using the recurrence formulas (1) and (2) in the above-described design method. .

Even if the layer (structure) ahead of the existing road surface layer 100 is not expected, the impedance Z _in0 ^* _seen from the radio wave arrival side surface of the existing road surface layer 100 does not change. If the impedance Z _in0 ^* does not change even if it is short-circuited by radio waves or released, there is no problem.
It is necessary to consider the layer (structure) at a higher level. When the impedance Z _in0 ^* estimated from the surface of the existing road surface layer 100 on the radio wave arrival side is measured, it is natural that Z _in0 ^* is an impedance that also includes the layer (structure) ahead of the existing road surface layer 100. It is possible to design using Z _in0 ^* .

Next, with reference to FIGS. 20 and 21, two examples of a method of manufacturing the block-shaped or panel-shaped radio wave absorber 10 will be described.

In the method of manufacturing the radio wave absorber 10 shown in FIG. 20, first, as shown in FIG. 20A, the radio wave absorption layer 11, the radio wave reflector 12, and the base layer 13 are individually formed. In addition, only the base layer 13 is shown in FIG. next,
As shown in (b), the radio wave reflector 1 is placed on the base layer 13.
Place 2 and join. Next, as shown in (c), the radio wave absorbing layer 11 is placed on the radio wave reflector 12 and joined.
Thus, the radio wave absorption layer 11, the radio wave reflector 12, and the base layer 13 are integrated.

In the method of manufacturing the radio wave absorber 10 shown in FIG. 21, first, the radio wave absorption layer 11 is formed independently as shown in FIG. Next, as shown in (b), a radio wave reflector 12 made of metal particles or the like is provided on one surface of the radio wave absorption layer 11.
Put. Next, as shown in FIG.
By casting a road surface material for forming the base layer 13 on the base 2, the base layer 13 is formed and the radio wave absorbing layer 11, the radio wave reflector 12 and the base layer 13 are integrated.

According to each of the above manufacturing methods, the radio wave absorbing layer 1
1 is formed independently, so that the thickness of the radio wave absorbing layer 11 can be easily controlled. In order to achieve desired radio wave absorption characteristics in the radio wave absorber 10, an allowable value of an error with respect to a design value of the thickness of the radio wave absorption layer 11 is, for example, 10 mm or less. According to each of the above-described manufacturing methods, the radio wave absorber 10 requiring the highly accurate control of the thickness of the radio wave absorbing layer 11 can be manufactured accurately and easily. Further, according to each of the above manufacturing methods, the radio wave absorber 10 can be manufactured with an accuracy that the thickness of the radio wave absorbing layer 11 is within ± 1 mm from the design value.

Hereinafter, the radio wave absorber 10 according to the present embodiment will be described.
Some examples of the construction method will be described.

The radio wave absorber 10 is provided on the road,
3, the radio wave reflector 12 and the radio wave absorption layer 11 may be sequentially laminated, and the base layer 13, the radio wave reflector 12, and the radio wave absorption layer 11 may be used to pave a road.

Next, another method of installing the radio wave absorber 10 will be described with reference to FIGS. In this construction method, first, as shown in FIG. 22, the existing road surface 61 is dug down to a depth corresponding to the thickness of the radio wave absorber 10, and the storage portion 6 for installing the radio wave absorber 10 for road surface is provided.
Form 2 Next, as shown in FIG.
2 is provided with the radio wave absorber 10. The radio wave absorber 10 is shown in FIG.
In the case of a block shape or a panel shape as shown in FIG. 24, as shown in FIG. 24, a plurality of radio wave absorbers 10 may be arranged side by side in the storage portion 62.

As still another method of applying the radio wave absorber 10, a method of fixing the radio wave absorber 10 on an existing road surface with an adhesive may be used. In this case, as the adhesive, for example, a resin-based adhesive such as asphalt, epoxy-based, urethane-based, or acrylic-based can be used.

Next, referring to FIG. 25, radio wave absorber 10
Another construction method will be described. In this construction method, a plurality of block-shaped or panel-shaped radio wave absorbers 10 are arranged on a road such that a gap is formed between adjacent radio wave absorbers 10, and a road surface material 63 is provided in the gap.
It is a method of filling. In this construction method, the road surface material 63 plays a role of fixing the radio wave absorber 10 to the existing road or supplementing the fixation. In this construction method, as shown in FIG. 22, the existing road surface 61 is dug down to a depth corresponding to the thickness of the radio wave absorber 10 and
May be formed, and the radio wave absorber 10 may be installed in the storage section 62.

As shown in FIG. 25, in the area where the radio wave absorber 10 is provided on the road surface, the width D of the gap filled with the road surface material 63 is freely set in order to prevent the deterioration of the radio wave absorption characteristics. It is preferably equal to or less than ８ of the wavelength λ of the radio wave in space, and more preferably equal to or less than λ / 16.

The road surface material 63 may have water permeability. When the radio wave absorber 10 has water repellency and the road surface material 63 has water permeability, as shown in FIG. 25, the water repelled on the surface of the radio wave absorber 10 passes through the road surface material 63. Since the water is drained from the water pipe 64, it is possible to prevent the water absorption performance of the radio wave absorber 10 from deteriorating due to the accumulation of water on the surface of the radio wave absorber 10. In addition, the road surface material 63 having water permeability is a water-permeable mortar, a water-permeable concrete, a water-permeable pavement material, or the like having the same configuration as the base layer 13 having the water permeability.

Next, referring to FIG. 26, radio wave absorber 10
Another construction method will be described. In this construction method, similarly to the construction method shown in FIG. 25, a plurality of block-shaped or panel-shaped radio wave absorbers 10 are arranged side by side so that a gap is formed between adjacent radio wave absorbers 10. In the method of filling the road surface material 63 in the gap, a base layer 65 having water permeability is provided below the radio wave absorber 10.

According to this construction method, since the base layer 65 having water permeability is used as a primary water storage layer, water can collect on the surface of the radio wave absorber 10 more effectively than the construction method shown in FIG. This can prevent the radio wave absorber 10 from deteriorating the radio wave absorption performance. In addition, according to this construction method, since the water storage capacity can be controlled by the thickness of the base layer 65, the base layer 65 should be thick at a place where water easily accumulates on the surface of the radio wave absorber 10 or at a place with a large amount of rainfall. Accordingly, it is possible to more effectively prevent the radio wave absorbing performance of the radio wave absorber 10 from deteriorating. The base layer 65 having water permeability is a water-permeable mortar, a water-permeable concrete, a water-permeable pavement material, or the like having the same configuration as the base layer 13 having the water permeability.

Next, with reference to FIGS. 27 to 29, still another method of applying the radio wave absorber 10 will be described. In this construction method, an anchor is embedded in the base layer 13 of the radio wave absorber 10 and the anchor is used by the anchor.
Is fixed to an existing road surface or a base layer on which a road surface radio wave absorber is installed. Anchor is radio wave absorber 10
In addition to fixing, the function of strengthening the fixing strength is also provided.

FIG. 27 shows that the anchor 7 is provided at the bottom of the base layer 13.
1 shows a radio wave absorber 10 embedded therein. FIG.
The radio wave absorber 10 in which the anchor 72 is embedded on the side of the base layer 13 is shown. FIG. 29 shows the anchors 71, 7
26 shows an example in which the radio wave absorber 10 having the number 2 is constructed by the same method as the construction method shown in FIG.

Next, with reference to FIGS. 30 to 33, still another method of applying the radio wave absorber 10 will be described. This construction method uses the radio wave reflector 12 in the radio wave absorber 10.
Extend to the side of the radio wave absorbing layer 11 and the base layer 13,
This is a method in which the radio wave absorber 10 is installed on a road by fixing an extended portion of the radio wave reflector 12 to an existing road surface or a base layer on which the radio wave absorber is installed. In this method, the radio wave reflector 12 is formed of, for example, a metal mesh, a metal plate, a metal plate having a plurality of holes, or a conductive mesh.

FIG. 30 shows that the radio wave reflector 12 is
1 shows the radio wave absorber 10 extending to the side of the base layer 13. FIG. 31 shows the radio wave absorbing layer 11 and the base layer 1.
3 shows the radio wave absorber 10 in which the radio wave reflector 12 extended to the side of No. 3 is further bent downward. FIG. 32 shows the radio wave absorber 10 in which the radio wave reflector 12 extending to the side of the radio wave absorbing layer 11 and the base layer 13 is further bent downward to extend to the bottom of the base layer 13. FIG. 33 shows an example in which the radio wave absorber 10 shown in FIG. 30 is constructed by the same method as the construction method shown in FIG. In this example, the radio wave reflector 12 may be electrically connected between the adjacent radio wave absorbers 10.

Next, still another method of applying the radio wave absorber 10 will be described. This construction method is a method of constructing the radio wave absorber 10 by sequentially laminating the radio wave reflector 12 and the radio wave absorption layer 11 on the road surface layer of an existing road also serving as the base layer 13. In this construction method, when a carbon fiber sheet is used as the radio wave reflector 12,
An adhesive may be applied on the road surface layer, a carbon fiber sheet may be disposed thereon, and an adhesive may be further applied on the carbon fiber sheet to form the radio wave absorbing layer 11 thereon.

Hereinafter, the above construction method will be described in detail with reference to FIG. In this construction method, first, as shown in FIG. 34A, after cleaning the upper surface of the road surface layer 91 of the existing road also serving as the base layer 13, the shot surface is used to clean the road surface layer 91 using a shot blast, a grinder, or the like. Grind the top surface to remove surface contaminants.

Next, the upper surface of the road surface layer 91 after the grinding is subjected to a primer (undercoat) treatment for applying a resin.
In this primer treatment, for example, a thermosetting resin such as an epoxy resin, a methyl methacrylate resin, and a vinyl ester resin is used.

Next, if necessary, the upper surface of the road surface layer 91 after the primer treatment is subjected to a process for correcting irregularities (surface irregularities). In this unevenness correction processing, as the unevenness correction material, for example, a resin mortar containing an aggregate, a filler, and a binder made of a thermosetting resin such as an epoxy resin, a methyl methacrylate resin, and a vinyl ester resin is used. Can be

Next, the radio wave reflector 12 is laminated on the road surface layer 91 which has been subjected to the above-described processes. Radio wave reflector 1
As 2, for example, a carbon fiber sheet or a resin mortar containing metal powder or metal fiber is used. Hereinafter, a case where a carbon fiber sheet is used as the radio wave reflector 12 will be described.

In this case, as shown in FIG. 34A, the adhesive 92 is applied on the road surface layer 91 after the unevenness correcting material has hardened. As the adhesive 92, for example, a thermosetting resin such as an epoxy resin, a methyl methacrylate resin, and a vinyl ester resin is used.

Next, as shown in FIG. 34B, a carbon fiber sheet 93 as the radio wave reflector 12 is attached on the adhesive 92. The carbon fiber sheet 93 is a unidirectional material,
Any of a bidirectional woven fabric, a triaxial woven fabric, and a carbon fiber nonwoven fabric may be used.

Next, as shown in FIG. 34 (c), a new adhesive 94 is applied on the carbon fiber sheet 93.
As the adhesive 94, for example, a thermosetting resin similar to the adhesive 92 is used.

Next, as shown in FIG. 34D, before the adhesive 94 is hardened, silica sand 95 is scattered on the adhesive 94.

Next, as shown in FIG. 34 (e), the radio wave absorbing layer 11 is formed on the adhesive 94, and the radio wave absorber 10 is completed. As the radio wave absorbing layer 11, for example,
A resin mortar obtained by mixing an aggregate containing ferrite as a radio wave absorbing material and a binder resin is used. If the particle size of the ferrite contained in the aggregate is too small, the workability of the mortar is deteriorated. If the particle size is too large, the radio wave absorbing layer 11 cannot be made thin.
mm, more preferably about 0.2 to 2 mm. The weight ratio of ferrite contained in the aggregate depends on the radio wave absorption characteristics required for the radio wave absorption layer 11. If the amount of the binder resin is too small in the resin mortar, water enters the resin mortar, and the radio wave absorbing performance of the radio wave absorbing layer 11 changes. Further, if the amount of the binder resin in the resin mortar is too large, the resin comes out on the surface of the radio wave absorbing layer 11 and the sliding resistance is reduced. Therefore, the weight ratio of the ferrite-containing aggregate to the binder resin is preferably 100: 10 to 30 and 100: 15 to 2%.
5 is more preferred.

According to the above construction method, the radio wave reflector 12 and the radio wave absorption layer 11 are sequentially laminated on the road surface layer 91 of the existing road also serving as the base layer 13, and the radio wave absorber 10 is constructed. Therefore, the radio wave absorber 10 can be easily constructed using the road surface layer 91 of the existing road.

Next, the radio wave absorber 10 according to the present embodiment
The following describes six examples of the construction method.

[First Embodiment] FIG. 35 is a sectional view showing a radio wave absorber 10 according to a first embodiment. In this embodiment,
From 85 parts of No. 6 crushed stone (particle size 13 to 5 mm), 15 parts of sand, 12 parts of polymer cement, and 4 parts of water, a porous concrete plate having a porosity of 15% and a thickness of 60 mm and having water permeability is manufactured. Was cured for 2 weeks to form a base layer 13. Next, on the base layer 13, the No. 7 crushed stone (particle size: 5 to 2.5 m
m) 80 parts, 20 parts of stainless steel particles having an average particle diameter of 1 mm,
A porosity of 19%, consisting of 8 parts of a cold-setting epoxy resin
Was laid in a thickness of 20 mm, rolled and cured to form a radio wave reflector 12. Next, after the water-permeable resin mortar containing the stainless steel particles (the radio wave reflector 12) is cured, 40 parts of ferrite particles having a particle size of 2 mm, a maximum particle size of 5 mm, and an average particle size of 3 mm are placed on the radio wave reflector 12. A water-permeable resin mortar having a porosity of 20%, composed of 50 parts of hard porcelain aggregate (ceramic aggregate), 10 parts of sand, and 6 parts of a room temperature-curable epoxy resin, is laid in a thickness of 30 mm.
By curing, the radio wave absorbing layer 11 was formed. In this embodiment,
As described above, the water-permeable radio wave absorber 10 having a three-layer structure with a thickness of 110 mm was manufactured. The water-permeable radio wave absorber 10 is constructed by joining the base layer 13 on the water-impermeable base layer 81 via the adhesive layer 82.

[Second Embodiment] FIG. 36 is a sectional view showing a radio wave absorber 10 according to a second embodiment. In this embodiment,
No. 6 crushed stone 75 parts, stainless steel powder 1 with an average particle size of 0.1 mm
From 5 parts, 10 parts of sand, 10 parts of polymer cement, and 3 parts of water, a porous concrete plate having a porosity of 16%, a thickness of 80 mm, and having water permeability and radio wave reflection was produced, and cured for 2 weeks. The base layer 13 also served as the radio wave reflector 12. Next, on the base layer 13, 45 parts of ferrite particles having a particle diameter of 2 mm, 50 parts of hard aggregate (emery) having a maximum particle diameter of 5 mm and an average particle diameter of 3 mm, 5 parts of sand, and 6 parts of a room temperature-curable epoxy resin A 30% water-permeable resin mortar having a porosity of 20% was laid, rolled and cured to form a radio wave absorbing layer 11. In this embodiment, as described above, the water-permeable radio wave absorber 10 having a two-layer structure with a thickness of 110 mm
Was manufactured. This water-permeable radio wave absorber 10 is
Is bonded onto an impermeable base layer 81 via an adhesive layer 82.

[Third Embodiment] FIG. 37 is a sectional view showing a radio wave absorber 10 according to a third embodiment. In this embodiment,
On a concrete-paved impermeable base layer 81 having a thickness of 20 cm, 80 parts of No. 6 crushed stone, 15 parts of stainless steel particles having an average particle diameter of 1 mm, 5 parts of sand, and an early-strength polymer cement 12
And a water permeable concrete having a porosity of 15%, a thickness of 8 cm, and a water permeability and a radio wave reflectivity. Next, after the concrete was solidified, 45 parts of ferrite particles having a particle size of 2 mm, a maximum particle size of 5 mm, and an average particle size of 3 mm
30% of a water-permeable resin mortar having a porosity of 20%, composed of 50 parts of hard porcelain aggregate (ceramic aggregate), 5 parts of sand and 6 parts of a room temperature-curable epoxy resin,
By curing, the radio wave absorbing layer 11 was formed. In this embodiment,
As described above, the water-permeable radio wave absorber 10 having a two-layer structure was manufactured.

[Fourth Embodiment] In this embodiment, the thickness 5c
m, 80 parts of No. 7 crushed stone, 15 parts of stainless steel particles having an average particle diameter of 1 mm, 5 parts of sand, and 8 parts of cold-setting epoxy resin on a drainage pavement base layer using an aggregate having a maximum particle diameter of 13 mm. Mortar with a porosity of 19%
m, rolled and cured to obtain a radio wave reflector. next,
After the water-permeable resin mortar (radio wave reflector) is cured, 50 parts of ferrite particles having a particle diameter of 2 mm, a maximum particle diameter of 5 mm, and an average particle diameter of 3 mm are provided on the radio wave reflector.
A water-permeable resin mortar having a porosity of 20%, consisting of 45 parts, 5 parts of sand and 6 parts of a room temperature-curable epoxy resin, is 30 mm.
It was laid, rolled and cured to form a radio wave absorbing layer. In this example, as described above, the water-permeable radio wave absorber 10 having a thickness of 110 mm and a three-layer structure was manufactured. In this embodiment, the base layer also serves as the base layer of the radio wave absorber.

[Fifth Embodiment] This embodiment is an example of the water-repellent radio wave absorber 10. In the present embodiment, in place of the base layer 13 in the first embodiment, No. 5 crushed stone (particle size: 19 to 1)
3 mm) A base layer 13 made of a 60 mm-thick concrete plate manufactured using 51 parts, 49 parts of sand, 20 parts of cement, and 9 parts of water was used. Further, in this embodiment, instead of the radio wave reflector 12 and the radio wave absorption layer 11 in the first embodiment, the radio wave reflector 12 and the radio wave absorber made of resin mortar in which the weight ratio of the epoxy resin to the aggregate is 28%. Layer 11 was used. Other configurations of the radio wave absorber 10 in the present embodiment are the same as those in the first embodiment.

[Sixth Embodiment] In this embodiment, as shown in FIG. 34, the road surface layer 9 of the existing road also serving as the base layer 13 is used.
This is an example in which the radio wave absorber 10 is constructed by sequentially laminating a radio wave reflector 12 and a radio wave absorption layer 11 on the radio wave absorber 1.

In the construction method of the present embodiment, first, FIG.
As shown in FIG. 4A, after cleaning the upper surface of the road surface layer 91 of the existing road also serving as the base layer 13, the upper surface of the road surface layer 91 is ground using a shot blast, a grinder, or the like, and the surface of the road surface 91 is ground. Contaminants were removed. Next, after the upper surface of the ground surface layer 91 after the grinding was subjected to a primer treatment with an epoxy resin-based primer, an irregularity correction treatment was performed. An epoxy resin-based non-land correction material was used as the non-land correction material. Next, as shown in FIGS. 34 (b) and (c), after the unevenness correction material is cured, the carbon fiber sheet 93 as the radio wave reflector 12 is placed on the road surface layer 91 with the adhesive 92, 94 was used. The carbon fiber sheet 93 has a basis weight of 200 g / m2.
² two-way carbon fiber sheets were used, and as the adhesives 92 and 94, epoxy resin-based impregnated adhesive resins for carbon fiber sheets were used.

Next, as shown in FIG. 34 (e), the radio wave absorbing layer 11 was formed on the adhesive 94, and the radio wave absorber 10 was completed. The radio wave absorbing layer 11 is made of 5 pieces of ferrite.
5 parts by weight of a blended aggregate having a particle size of 0.2 to 1.5 mm and an epoxy resin-based binder resin in a weight ratio of 10
A resin mortar blended at a ratio of 0:20 was formed by applying a thickness of 5 mm.

In general, whether a pavement is water-permeable or non-water-permeable depends on the porosity of the pavement. The porosity is determined by the combination of the shape of the aggregate and the particle size of the aggregate, the amount of the binder, and the like. In order to make the pavement permeable, it is generally said that a porosity of about 10% or more is required.

As described above, the radio wave absorber for road surface 10 according to the present embodiment includes the radio wave absorbing layer 11, the radio wave reflector 12, and the base layer 13 made of the road surface material for securing the road surface strength. And According to the radio wave absorber 10, the radio wave absorption layer 11 can be designed and manufactured so as to obtain desired radio wave absorption characteristics independently of the base layer 13, and the base layer 13 has a desired mechanical strength. Can be obtained. Therefore, according to the present embodiment, it is possible to realize the road surface radio wave absorber 10 that can exhibit desired radio wave absorption characteristics even when installed on a road surface and does not reduce the mechanical strength of the road surface.

Further, the radio wave absorber 10 according to the present embodiment
In the automatic toll collection system and the millimeter wave radar system, the malfunction of the system due to the reflection of the radio wave on the road surface can be prevented by installing the.

Note that the present invention is not limited to the above embodiment, and various changes can be made. For example, the materials of the radio wave absorbing layer 11, the radio wave reflector 12, and the base layer 13 described in the embodiment are merely examples, and the present invention is not limited thereto. Further, the radio wave absorber for road surface of the present invention can be installed not only on the road surface but also on a tunnel wall or the like.

[0142]

As described above, claims 1 to 6
According to the radio wave absorber for road surface described in any one of the above, the radio wave absorption layer can be designed and manufactured so as to obtain desired radio wave absorption characteristics independently of the base layer, and the desired radio wave absorption layer can be formed by the base layer. Mechanical strength can be obtained, so that a desired radio wave absorption characteristic can be exhibited even when installed on a road surface, and an effect of realizing a road surface radio wave absorber that does not reduce the mechanical strength of the road surface can be achieved. .

Further, according to the road surface radio wave absorber according to any one of claims 2 and 36 to 41, the radio wave absorption layer, the radio wave reflector and the base layer are formed as a whole. As described above, since they are laminated and integrated, it is possible to easily carry and install the radio wave absorber for road surface.

Further, according to the radio wave absorber for road surface according to any one of claims 3 to 14, the radio wave absorbing layer is made of a particulate or powdery radio wave absorbing material and a particulate or powdery aggregate. Since the radio wave absorbing material and the binder for fixing the aggregate are included, the radio wave absorbing layer has the effect of exhibiting the desired radio wave absorbing characteristics and the function as a road surface.

According to the radio wave absorber for road surface according to the twenty-fourth aspect, since the radio wave reflector has rust resistance, it is possible to prevent the radio wave reflector from being rusted.

Further, according to the radio wave absorber for road surface according to claim 29, since the base layer also serves as a radio wave reflector and has rust resistance, it is possible to prevent the base layer also serving as a radio wave reflector from rusting. This has the effect that it can be prevented.

According to the radio wave absorber for road surface according to the thirty-fifth aspect, both the radio wave absorption layer and the base layer have water repellency, and the radio wave reflector is protected from exposure to the outside. Since the radio wave reflector is covered with the layer, even if the radio wave reflector does not have rust resistance, it is possible to prevent the radio wave reflector from being rusted.

According to the radio wave absorber for road surface according to any one of claims 36 to 41, the integrated radio wave absorbing layer, the radio wave reflector and the water-repellent coating layer surrounding the base layer are provided. With the provision, even when the radio wave reflector does not have rust resistance, there is an effect that the radio wave reflector can be prevented from rusting.

Further, according to the radio wave absorber for road surface according to any one of claims 42 to 47, at least the radio wave absorption layer among the radio wave absorption layer, the radio wave reflector and the base layer has water permeability. Therefore, it is possible to prevent accumulation of water on the road surface.

According to the radio wave absorber for road surface according to any one of claims 48 to 53, at least one of the radio wave absorbing layer, the radio wave reflector and the base layer has water repellency. This has the effect that it is possible to prevent the performance of the radio wave absorber for road surface from deteriorating due to the penetration of water into the radio wave absorber, the radio wave reflector and the base layer.

According to the radio wave absorber for road surface according to any one of claims 54 to 59, a water-repellent coating layer surrounding at least one of the radio wave absorbing layer, the radio wave reflector and the base layer. Therefore, even when at least one of the radio wave absorbing layer, the radio wave reflector and the base layer does not have water repellency, it is possible to configure the road surface radio wave absorber to have water repellency. It has the effect of becoming.

According to the radio wave absorber for road surface according to claim 61, a plurality of layers constituting the radio wave absorption layer are mutually connected.
Since at least one of the electromagnetic constant and the thickness is made different, there is an effect that the radio wave absorption performance can be broadened and the angle can be widened.

According to the method for manufacturing a radio wave absorber for a road surface of the present invention, a desired radio wave absorption characteristic can be exhibited even when the road surface is installed, and the mechanical strength of the road surface is not reduced. The radio wave absorber can be realized, and the radio wave absorber for roads, which requires highly accurate control of the thickness of the radio wave absorption layer, can be produced accurately and easily.

In addition, according to the method for constructing a radio wave absorber for a road surface according to any one of claims 65 to 75, desired electromagnetic wave absorption characteristics can be exhibited even when the radio wave absorber is installed on a road surface, and the mechanical strength of the road surface can be reduced. There is an effect that the radio wave absorber for road surface which is not lowered can be installed on the road surface.

Further, according to the construction method of a road surface radio wave absorber according to claim 69 or 70, a plurality of road surface radio wave absorbers are formed on a road so that a gap is formed between adjacent road surface radio wave absorbers. Since the absorbers are installed side by side and the gaps are filled with a road surface material having water permeability, water will collect on the surface of the road surface radio wave absorber, and the radio wave absorption performance of the road surface radio wave absorber will decrease. The effect that it can prevent is produced.

According to the construction method of a road surface radio wave absorber according to any one of claims 73 to 75, a radio wave reflector and a radio wave absorption layer are provided on a road surface layer of an existing road also serving as a base layer. Since the road surface radio wave absorbers are sequentially laminated and applied, the road surface radio wave absorber can be easily constructed using the road surface layer of the existing road.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a road surface radio wave absorber according to an embodiment of the present invention.

FIG. 2 is a sectional view of a road surface radio wave absorber in a block shape or a panel shape.

FIG. 3 is an explanatory diagram for describing an outline of a road surface radio wave absorber and an automatic toll collection system to which the radio wave absorber is applied.

FIG. 4 is an enlarged cross-sectional view showing a part of a radio wave absorbing layer in a road surface radio wave absorber.

FIG. 5 is an explanatory view showing an example of a form of a radio wave absorbing material in a road surface radio wave absorber and a forming method thereof.

FIG. 6 is an explanatory view showing an example of a form of a radio wave absorbing material in a radio wave absorber for a road surface and an example of a forming method thereof.

FIG. 7 is an explanatory view showing an example of a form of a radio wave absorbing material in a radio wave absorber for a road surface and an example of a forming method thereof.

FIG. 8 is an explanatory diagram showing an example of a form of a radio wave absorbing material in a road surface radio wave absorber and a forming method thereof.

FIG. 9 is an explanatory diagram showing an example of a form of a radio wave absorbing material in a road surface radio wave absorber and a method of forming the material.

FIG. 10 is a cross-sectional view showing an example of a configuration of a radio wave reflector in a road surface radio wave absorber.

FIG. 11 is a cross-sectional view showing another example of the configuration of the radio wave reflector in the radio wave absorber for road surface.

FIG. 12 is a cross-sectional view illustrating an example of a configuration of a base layer also serving as a radio wave reflector.

FIG. 13 is a cross-sectional view showing another example of the configuration of the base layer also serving as a radio wave reflector.

14 is a plan view showing a surface of the base layer shown in FIG. 13 on a radio wave arrival side.

FIG. 15 is a sectional view of a road surface radio wave absorber in which a radio wave reflector is covered by a radio wave absorption layer and a base layer.

FIG. 16 is a cross-sectional view of a road surface radio wave absorber provided with a coating layer.

FIG. 17 is a cross-sectional view of a road surface radio wave absorber in which the radio wave absorption layer is constituted by two layers.

FIG. 18 is an explanatory diagram showing an electric equivalent circuit of an existing road surface layer and a radio wave absorber installed thereon.

FIG. 19 is an explanatory diagram showing an electric equivalent circuit of an existing road surface layer and a radio wave absorber installed thereon.

FIG. 20 is an explanatory view showing an example of a method for manufacturing a block-shaped or panel-shaped road surface radio wave absorber.

FIG. 21 is an explanatory view showing another example of a method of manufacturing a block-shaped or panel-shaped road surface radio wave absorber.

FIG. 22 is a cross-sectional view for describing a method of installing a road surface radio wave absorber.

FIG. 23 is a cross-sectional view for explaining a method of installing a road surface radio wave absorber.

FIG. 24 is a cross-sectional view for explaining a method of constructing a road surface radio wave absorber.

FIG. 25 is a cross-sectional view for describing a method of installing a road surface radio wave absorber.

FIG. 26 is a cross-sectional view for explaining a method of installing a road surface radio wave absorber.

FIG. 27 is a cross-sectional view of a road surface radio wave absorber in which an anchor is embedded at the bottom of a base layer.

FIG. 28 is a cross-sectional view of a road surface radio wave absorber in which an anchor is embedded in a side portion of a base layer.

FIG. 29 is a cross-sectional view for explaining a method of installing a road surface radio wave absorber having an anchor.

FIG. 30 is a cross-sectional view showing an example of a road surface radio wave absorber in which a radio wave reflector extends to the side of a radio wave absorption layer and a base layer.

FIG. 31 is a cross-sectional view illustrating another example of a road surface radio wave absorber in which a radio wave reflector extends to the side of a radio wave absorption layer and a base layer.

FIG. 32 is a cross-sectional view showing still another example of a road surface radio wave absorber in which a radio wave reflector extends to the side of a radio wave absorption layer and a base layer.

FIG. 33 is a cross-sectional view for describing a method of installing the road surface radio wave absorber shown in FIG. 30.

FIG. 34 is an explanatory diagram showing a method of installing a road surface radio wave absorber.

FIG. 35 is a cross-sectional view showing a road surface radio wave absorber of the first example of the embodiment of the present invention.

FIG. 36 is a sectional view showing a radio wave absorber for road surface according to a second example of an embodiment of the present invention.

FIG. 37 is a cross-sectional view showing a road surface radio wave absorber of a third example of one embodiment of the present invention.

[Explanation of symbols]

10 radio wave absorber for road surface, 11 radio wave absorption layer, 12 radio wave reflector, 13 base layer.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshito Hirai 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (72) Inventor Koji Takizawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Incorporated (72) Inventor Akira Matsuno 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Chemical Industrial Co., Ltd. (72) Taiichi Otani 1-8-2, Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Within Chemical Industrial Co., Ltd. (72) Inventor Mitsuharu Tezuka 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Chemical Industrial Co., Ltd. F-term (reference) 2D051 AA02 AA07 AD05 AE04 AE05 AF01 AF02 AF11 AG01 AG11 AG14 AH02 DB02 5E040 BB01 BB05 CA13

Claims (75)

[Claims] 1. A radio wave absorbing layer for absorbing radio waves, a radio wave reflector disposed on a side of the radio wave absorbing layer opposite to a radio wave arrival side and reflecting radio waves, and a road surface material for ensuring road surface strength And a base layer disposed on the opposite side of the radio wave absorption layer from the radio wave arrival side. 2. The radio wave absorbing layer, the radio wave reflecting body and the base layer are laminated and integrated so that the entire road surface radio wave absorbing body has a flat plate shape. The radio wave absorber for road surface described. 3. The radio wave absorbing layer comprises: a radio wave absorbing material in the form of particles or powder; an aggregate in the form of particles or powder;
The radio wave absorber for a road surface according to claim 1 or 2, further comprising a binder for fixing the radio wave absorbing material and the aggregate. 4. The radio wave absorber for a road surface according to claim 3, wherein the radio wave absorbing material includes a magnetic material. 5. The radio wave absorbing material is a sintered magnetic particle obtained by firing particles of a magnetic powder formed to have a desired particle size.
The radio wave absorber for road surface described. 6. The radio wave absorbing material is a sintered magnetic particle formed to have a desired particle size by crushing a sintered magnetic material larger than a desired particle size. The radio wave absorber for road surface according to claim 4. 7. The radio wave absorbing material according to claim 4, wherein the particles are formed by coating particles of a magnetic material powder formed to have a desired particle diameter with a coating material. The radio wave absorber for road surface described. 8. The radio wave absorbing material for a road surface according to claim 4, wherein the radio wave absorbing material is a particle formed to have a desired particle size by a mixture of a magnetic material powder and a binder. body. 9. The radio wave absorber for a road surface according to claim 3, wherein the radio wave absorbing material includes a dielectric loss body. 10. The radio wave absorbing material according to claim 1, wherein the particles are formed by coating particles of a dielectric loss material powder formed to have a desired particle diameter with a coating material. 9. The radio wave absorber for road surface according to item 9. 11. The radio wave for road surface according to claim 9, wherein the radio wave absorbing material is a particle formed to have a desired particle size by a mixture of a powder of a dielectric loss body and a binder. Absorber. 12. The radio wave absorber for a road surface according to claim 3, wherein the binder is asphalt. 13. The radio wave absorber for a road surface according to claim 3, wherein the binder is a cold-setting resin. 14. The radio wave absorber for a road surface according to claim 13, wherein the cold-setting resin contains an epoxy resin. 15. The radio wave absorber for a road surface according to claim 1, wherein the radio wave reflector is made of a single material. 16. The radio wave reflector according to claim 1, wherein the radio wave reflector includes a single material and a binder for bonding the material to at least one of the radio wave absorption layer and the base layer. The radio wave absorber for road surface described. 17. The radio wave absorber for a road surface according to claim 1, wherein the radio wave reflector includes a plurality of radio wave reflection materials and a binder for fixing the plurality of radio wave reflection materials. 18. The radio wave absorber for a road surface according to claim 17, wherein the radio wave reflector further includes an aggregate. 19. The radio wave absorber for a road surface according to claim 16, wherein the binder is asphalt. 20. The radio wave absorber for a road surface according to claim 16, wherein the binder is cement. 21. The radio wave absorber for a road surface according to claim 16, wherein the binder is a cold-setting resin. 22. The radio wave absorber for a road surface according to claim 21, wherein the cold-setting resin includes an epoxy resin. 23. The road surface radio wave absorber according to claim 1, wherein the radio wave reflector includes a material in which carbon fibers are formed in a sheet shape. 24. The radio wave absorber for a road surface according to claim 1, wherein the radio wave reflector has rust resistance. 25. The radio wave absorber for a road surface according to claim 1, wherein the base layer includes a particulate or powdered aggregate and a binder for binding the aggregate. 26. The radio wave absorber for a road surface according to claim 1, wherein the base layer also serves as the radio wave reflector. 27. The method according to claim 26, wherein the base layer includes a particulate or powdery aggregate, a plurality of radio wave reflecting materials, and a binder for fixing the aggregate and the radio wave reflecting material. Road surface wave absorber. 28. The base layer includes a particulate or powdered aggregate, a plurality of radio wave reflecting materials disposed near a surface of the base layer on the radio wave arrival side, and anchors the aggregate and the radio wave reflecting material. The radio wave absorber for road surface according to claim 26, further comprising a binder. 29. The radio wave absorber for a road surface according to claim 26, wherein the base layer has rust resistance. 30. The radio wave absorber for a road surface according to claim 25, wherein the binder is asphalt. 31. The radio wave absorber for a road surface according to claim 25, wherein the binder is cement. 32. The radio wave absorber for a road surface according to claim 25, wherein the binder is a cold-setting resin. 33. The radio wave absorber for a road surface according to claim 32, wherein the cold-setting resin includes an epoxy resin. 34. The radio wave absorber for a road surface according to claim 1, wherein the base layer is at least a part of a road surface layer of an existing road. 35. The radio wave absorbing layer and the base layer both have water repellency, and the radio wave reflector is covered by the radio wave absorbing layer and the base layer so as not to be exposed to the outside. The radio wave absorber for a road surface according to claim 1 or 2, wherein 36. The integrated radio wave absorbing layer,
The radio wave absorber for a road surface according to claim 2, further comprising a water-repellent coating layer that covers the periphery of the radio wave reflector and the base layer. 37. The covering layer includes a constituent material including at least one of a plurality of aggregates and a plurality of fillers, and a binder for binding the constituent materials, and a weight ratio of the binder to the constituent material is 15% or more and 500% or more. %. The radio wave absorber for a road surface according to claim 36, wherein 38. The radio wave absorber for a road surface according to claim 37, wherein the binder is asphalt. 39. The radio wave absorber for a road surface according to claim 37, wherein the binder is cement. 40. The radio wave absorber for a road surface according to claim 37, wherein the binder is a cold-setting resin. 41. The radio wave absorber for a road surface according to claim 40, wherein the cold-setting resin includes an epoxy resin. 42. The radio wave absorption device for a road surface according to claim 1, wherein at least the radio wave absorption layer among the radio wave absorption layer, the radio wave reflector and the base layer has water permeability. body. 43. The radio wave absorbing layer having water permeability, at least the radio wave absorbing layer of the radio wave reflector and the base layer includes a particulate or powdery constituent material and a binder for fixing the constituent materials, 43. The radio wave absorber for a road surface according to claim 42, wherein a weight ratio of the binder to the constituent material is 2% or more and 20% or less. 44. The radio wave absorber for a road surface according to claim 43, wherein the binder is asphalt. 45. The radio wave absorber for a road surface according to claim 43, wherein the binder is cement. 46. The radio wave absorber for a road surface according to claim 43, wherein the binder is a cold-setting resin. 47. The radio wave absorber for a road surface according to claim 46, wherein the cold-setting resin includes an epoxy resin. 48. The radio wave absorber for a road surface according to claim 1, wherein at least one of the radio wave absorbing layer, the radio wave reflector and the base layer has water repellency. . 49. At least one of the radio wave absorbing layer, the radio wave reflector and the base layer having water repellency contains a particulate or powdery constituent material and a binder for fixing them, and the binder 49. The radio wave absorber for road surface according to claim 48, wherein a weight ratio of the component to the constituent material is 15% or more and 100% or less. 50. The radio wave absorber for a road surface according to claim 49, wherein the binder is asphalt. 51. The road surface radio wave absorber according to claim 49, wherein the binder is cement. 52. The radio wave absorber for a road surface according to claim 49, wherein the binder is a cold-setting resin. 53. The radio wave absorber for a road surface according to claim 52, wherein the cold-setting resin includes an epoxy resin. 54. A water-repellent coating layer for surrounding at least one of the radio wave absorbing layer, the radio wave reflector and the base layer. A radio wave absorber for a road surface as described in Crab. 55. The coating layer includes a constituent material including at least one of a plurality of aggregates and a plurality of fillers, and a binder for binding the constituent materials, wherein a weight ratio of the binder to the constituent material is 15% or more and 500% or more. 55. The road surface radio wave absorber according to claim 54, wherein 56. The radio wave absorber for a road surface according to claim 55, wherein the binder is asphalt. 57. The radio wave absorber for a road surface according to claim 55, wherein the binder is cement. 58. The radio wave absorber for a road surface according to claim 55, wherein the binder is a cold-setting resin. 59. The radio wave absorber for a road surface according to claim 58, wherein the cold-setting resin includes an epoxy resin. 60. The radio wave absorber for a road surface according to claim 1, wherein the radio wave absorption layer is constituted by a plurality of stacked layers. 61. The radio wave absorber for a road surface according to claim 60, wherein each of the layers constituting the radio wave absorbing layer has at least one of an electromagnetic constant and a thickness different from each other. 62. The radio wave absorbing layer according to claim 60, wherein the radio wave absorbing layer includes a layer containing no radio wave absorbing material.
The radio wave absorber for road surface described. 63. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer is disposed on a side opposite to a radio wave arrival side,
A radio wave absorber for a road surface, comprising a radio wave reflector for reflecting radio waves and a road surface material for securing the strength of the road surface, and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method for manufacturing a road surface radio wave absorber, wherein the radio wave absorption layer, the radio wave reflector and the base layer are laminated and integrated so that the entire road surface radio wave absorber has a flat plate shape. Forming the radio wave absorbing layer, the radio wave reflector and the base layer independently, placing the radio wave reflector on one surface of the base layer, and further mounting the radio wave absorbing layer thereon A step of integrating the radio wave absorbing layer, the radio wave reflector and the base layer with each other. 64. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer disposed on the side opposite to the radio wave arrival side,
A radio wave absorber for a road surface, comprising a radio wave reflector for reflecting radio waves and a road surface material for securing the strength of the road surface, and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method for manufacturing a road surface radio wave absorber, wherein the radio wave absorption layer, the radio wave reflector and the base layer are laminated and integrated so that the entire road surface radio wave absorber has a flat plate shape. A step of forming the radio wave absorbing layer alone, placing the radio wave reflector on one surface of the radio wave absorbing layer, and driving a road surface material for forming the base layer thereon. Forming the base layer and integrating the radio wave absorbing layer, the radio wave reflector, and the base layer with each other. 65. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer is disposed on a side opposite to a radio wave arrival side,
A radio wave reflector for reflecting a radio wave and a road surface radio wave absorber comprising a road surface material for securing the strength of the road surface and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method for performing, comprising: sequentially laminating the base layer, the radio wave reflector and the radio wave absorbing layer on a road; and paving a road with the base layer, the radio wave reflector and the radio wave absorbing layer. A method for constructing a radio wave absorber for roads, comprising: 66. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer is disposed on a side opposite to a radio wave arriving side,
A radio wave reflector for reflecting a radio wave and a road surface radio wave absorber comprising a road surface material for securing the strength of the road surface and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method of constructing, wherein a step of digging an existing road surface to a depth corresponding to a thickness of the road surface radio wave absorber to form a storage part for installing the road surface radio wave absorber, Installing the road surface radio wave absorber in a portion of the road surface. 67. A radio wave absorption layer for absorbing radio waves, and a radio wave absorption layer is disposed on a side opposite to a radio wave arrival side in the radio wave absorption layer,
A radio wave reflector for reflecting a radio wave and a road surface radio wave absorber comprising a road surface material for securing the strength of the road surface and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method for constructing a road surface radio wave absorber, comprising a step of fixing the road surface radio wave absorber on an existing road surface with an adhesive. 68. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer is disposed on the side opposite to the radio wave arrival side,
A radio wave absorber for a road surface, comprising a radio wave reflector for reflecting radio waves and a road surface material for securing the strength of the road surface, and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. The radio wave absorbing layer, the radio wave reflector and the base layer, a method for constructing a road surface radio wave absorber that is laminated and integrated so that the entire road surface radio wave absorber forms a flat plate shape. A step of arranging a plurality of road surface radio wave absorbers side by side on a road so that a gap is formed between adjacent road surface radio wave absorbers; and a step of filling the gap with a road surface material. A method for constructing a radio wave absorber for a road surface. 69. The method according to claim 68, wherein the road surface material has water permeability. 70. A base layer having water permeability under the road surface radio wave absorber.
9. The construction method of the road surface electromagnetic wave absorber according to 9. 71. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer is disposed on a side opposite to a radio wave arrival side,
A radio wave reflector for reflecting a radio wave and a road surface radio wave absorber comprising a road surface material for securing the strength of the road surface and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method of constructing, comprising: burying an anchor in the base layer in the road surface radio wave absorber; and installing the road surface radio wave absorber by the anchor on an existing road surface or a road surface radio wave absorber. And a step of fixing the electromagnetic wave absorber for a road surface. 72. A radio wave absorbing layer for absorbing radio waves, and a radio wave absorbing layer disposed on the side opposite to the radio wave arrival side,
A radio wave reflector for reflecting a radio wave and a road surface radio wave absorber comprising a road surface material for securing the strength of the road surface and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. In the method of construction, the radio wave reflector in the road surface radio wave absorber, extending to the side of the radio wave absorption layer and the base layer, the extended portion of the radio wave reflector existing Fixing the road surface radio wave absorber to the road by fixing the road surface radio wave absorber to the base layer on which the road surface radio wave absorber is installed. 73. A radio wave absorption layer for absorbing radio waves, and a radio wave absorption layer is disposed on a side opposite to a radio wave arrival side,
A radio wave reflector for reflecting a radio wave and a road surface radio wave absorber comprising a road surface material for securing the strength of the road surface and having a base layer disposed on the side opposite to the radio wave arrival side in the radio wave absorption layer. A method of construction, comprising: a step of sequentially laminating the radio wave reflector and the radio wave absorbing layer on a road surface layer of an existing road also serving as the base layer, Construction method. 74. The method according to claim 73, wherein the radio wave reflector includes a material in which carbon fibers are formed in a sheet shape. 75. The step of sequentially laminating the radio wave reflector and the radio wave absorbing layer on the road surface layer includes applying an adhesive on the road surface layer and forming the carbon fibers in a sheet shape thereon. 75. The method of claim 74, further comprising: disposing the material, applying an adhesive on the material, and forming the radio wave absorbing layer thereon.