JP4590126B2 - Pavement version to prevent electromagnetic interference - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a road pavement plate that can prevent electromagnetic interference by absorbing unnecessary electromagnetic waves when communicating, detecting or measuring with a traveling vehicle on a road. .
[0002]
[Prior art]
Development of an automatic toll collection system (ETC) for toll roads and a driving support system (AHS) for automobiles traveling on roads is advancing as part of an intelligent transportation system (ITS), which is a next-generation road traffic system.
[0003]
This automatic toll collection system is installed in the automatic fee payment device (IC card, radio wave tag, etc.) installed in the car and the toll gate of the toll gate without stopping the traffic of cars traveling on toll roads such as expressways. This is a system that collects fees by wireless communication with the automatic fee collection device. This automatic toll collection system is expected to be introduced not only from the standpoint of fee payment, but also from the viewpoint of alleviating traffic congestion and reducing labor costs.
[0004]
In the automatic toll collection system, detection means such as a radar of an automatic toll collection device arranged at the toll gate detects that a car traveling on the road has approached the toll gate to a predetermined distance.
[0005]
Then, the wireless communication device of the automatic toll collection device sends a signal to the running vehicle, and the information necessary for determining the toll for the vehicle from the automatic toll payment device mounted on the vehicle (vehicle type, contract details, payment account, etc.) ) Is transmitted by wireless communication. Then, the automobile-side automatic fee payment device transmits information necessary for determining the toll of the vehicle to the wireless communication device of the automatic fee collection device.
[0006]
The automatic toll collection device that has received the information necessary for determining the toll of the automobile calculates the toll based on the travel distance of the automobile on the toll road and executes a toll collection process.
[0007]
Also, in the automobile driving support system, for example, a lane marker is installed at each predetermined position on the road along the driving lane of the automobile, and detection of a radar or the like of the driving support apparatus mounted on the automobile traveling on the road is performed. The device detects the position of the lane marker to detect the proper travel route, and automatically drives the vehicle steering system to warn the driver of the possibility of deviation from the travel lane in order to drive the vehicle along this proper travel route. Intervene to help drive safely. In addition, various communication is performed between the lane marker communication device arranged on the road and the vehicle, which is used for determining a travel route by the car navigation system and used for transportation.
[0008]
[Problems to be solved by the invention]
In the automatic toll collection system and the driving support system for automobiles in the intelligent transportation system as described above, a traveling automobile is targeted for communication, detection or measurement using electromagnetic waves of a relatively high frequency. For this reason, the operation of communicating, detecting, or measuring using a relatively high frequency electromagnetic wave must be executed accurately at the instant when the traveling vehicle passes through a predetermined place.
[0009]
However, in this automatic toll collection system or automobile driving support system, unnecessary scattered electromagnetic waves are generated when a relatively high frequency electromagnetic wave emitted from these systems radiates on a road or the like. And this unnecessary scattered electromagnetic wave is received by the receiver of the automatic toll collection system or the driving support system of the automobile, and there is a possibility that the communication is disturbed or an error occurs in the detection or measurement operation.
[0010]
In addition, shortening the work period by using precast concrete manufactured at the factory for roads in the vicinity where the automatic toll collection system and the car communicate, or roads with lane markers in the car driving support system. To improve the quality of paved roads.
[0011]
However, a general concrete pavement plate is a material with a high density (so-called solid) that does not have voids, and has a larger dielectric constant than air, so that electromagnetic waves are reflected on the surface of the concrete pavement plate. easy.
[0012]
In addition, electromagnetic waves cannot be taken into the concrete plate because of the large reflection of electromagnetic waves on the concrete pavement surface. Therefore, even if a dielectric material or magnetic material is mixed into the concrete plate to provide a radio wave absorption function, a sufficient radio wave absorption effect can be obtained. I can't get it.
[0013]
Furthermore, if the surface of the concrete pavement stagnates due to rain or the like, the radio wave reflection on the surface of the concrete pavement slab increases.
[0014]
Due to the characteristics of the concrete pavement plate as described above, when the road portion where the lane marker is installed in the vicinity of the road portion where the automatic toll collection system and the vehicle communicate or the driving support system of the vehicle is configured with the concrete pavement plate, It is difficult to efficiently absorb electromagnetic waves emitted from these systems and suppress generation of unnecessary scattered electromagnetic waves.
[0015]
In consideration of the above facts, an object of the present invention is to newly provide a concrete pavement plate capable of suppressing the generation of unnecessary scattered electromagnetic waves.
[0019]
Claims of the invention 1 The pavement plate for preventing electromagnetic interference described in 1 is a low-density, low-dielectric constant material of porous concrete or porous asphalt mixture In Absorbs low-intensity electromagnetic waves for communication, detection or measurement Lead Mixing electromagnetic wave absorbing material mixed with electric wave absorbing material or magnetic wave absorbing material alone or in combination Power A magnetic wave reflection reducing surface layer is provided on the top of the concrete plate, An electromagnetic wave reflection layer was provided on the back surface of the electromagnetic wave reflection reduction surface layer. It is characterized by that.
[0020]
By configuring as described above, porous concrete or porous asphalt mixture has a porous structure, so there are many voids, and it has an electrical property between the surface of normal concrete or asphalt and air, so that the dielectric constant is reduced. The generation of unnecessary scattered electromagnetic waves can be suppressed by reducing the size and preventing the electromagnetic waves from being reflected on the surface of the surface layer, and allowing the electromagnetic waves to easily enter the surface layer.
[0021]
Further, the electromagnetic wave incident on the surface layer is absorbed by resistance loss by the electromagnetic wave absorbing material mixed in the surface layer, so-called Joule heat loss that converts the energy of the electromagnetic wave into heat, or energy loss due to induced current.
[0022]
Therefore, it is possible to reduce the electromagnetic wave reflected on the surface layer, and the electromagnetic wave reflected once on the surface of the concrete plate after entering the surface layer and released to the outside of the surface layer again.
[0023]
In addition, when there is rainfall on the surface layer, the rainwater can be quickly drained through a large number of gaps in the porous concrete or porous asphalt mixture, and can be prevented from stagnating. Therefore, it is possible to reduce the reflection of electromagnetic waves due to stagnant water.
[0024]
Claims of the invention 2 The paving slab for preventing electromagnetic interference described in 1. was composed of a low-density, low-dielectric constant material of porous concrete or porous asphalt mixture Porous layer Is the most surface layer, low density and low dielectric constant material of porous concrete or porous asphalt mixture In addition, Absorbs low-intensity electromagnetic waves for communication, detection or measurement Lead Mixing electromagnetic wave absorbing material mixed with electric wave absorbing material or magnetic wave absorbing material alone or in combination Power Magnetic wave reflection reduction surface layer With the porous layer Recast concrete plate Between Arranged in An electromagnetic wave reflection layer was provided on the back surface of the electromagnetic wave reflection reduction surface layer. It is characterized by that.
[0025]
By constructing as described above, since the porous concrete or porous asphalt mixture that constitutes the outermost surface layer has a porous structure, there are many voids, and there is an electric space between the surface layer of ordinary concrete or asphalt and air. Therefore, the generation of unnecessary scattered electromagnetic waves can be suppressed by reducing the dielectric constant, preventing the reflection of electromagnetic waves on the surface of the surface layer, and making the electromagnetic waves incident on the surface layer very easily.
[0026]
Furthermore, the electromagnetic wave incident on the outermost surface layer is more efficient due to resistance loss due to the electromagnetic wave absorbing material mixed in the lower surface layer, so-called Joule heat loss that converts electromagnetic wave energy into heat, or energy loss due to induced current. Absorbed.
[0027]
Therefore, the electromagnetic wave can easily enter the surface layer of the surface to suppress reflection, and the electromagnetic wave that has once entered the surface layer can be efficiently absorbed by the next surface layer, so that the electromagnetic wave is reflected by the surface layer and once enters the surface layer. Electromagnetic waves that are reflected on the surface of the concrete plate and then released to the outside of the surface layer can be greatly reduced.
[0028]
In addition, when there is rainfall on the surface layer, the rainwater can be quickly drained through a large number of gaps in the porous concrete or porous asphalt mixture, and can be prevented from stagnating. Therefore, it is possible to reduce the reflection of electromagnetic waves due to stagnant water.
[0029]
Claim 3 The invention described in claim 1 or claim 2 In the paving slab for preventing electromagnetic interference described in the above, the concrete plate or the precast concrete plate Part of , The guide Electromagnetic wave absorbing material or electromagnetic wave absorbing precast concrete mixed with the magnetic wave absorbing material alone or in combination Establish a plate , The electromagnetic wave reflection layer was provided on the back surface of the electromagnetic wave absorbing precast concrete plate. It is characterized by that.
[0030]
By configuring as described above, in addition to the action and effect of the above-described invention, resistance loss by the electromagnetic wave absorbing material mixed in the precast concrete plate itself, or so-called Joule heat loss that converts electromagnetic wave energy into heat, or More efficiently absorbed due to energy loss due to induced current.
[0031]
Claim 4 The invention described in claim 1 To prevent electromagnetic interference according to any one of claims 3 to 4. No pavement In the plate, in the surface layer of the concrete plate or the precast concrete plate, A recess is formed in a direction orthogonal to the traveling direction of the vehicle, and a drain hole is provided between the recess and the electromagnetic wave reflection reducing surface layer. It is characterized by that.
[0032]
By configuring as described above, in addition to the operations and effects of the above-described invention, for example, when a vehicle passes on a precast concrete paving slab, the surface layer and the concrete slab due to loading (horizontal force) of the vehicle It is possible to prevent peeling between layers or causing slippage due to an action such as a shearing force acting between them.
[0033]
Claim 5 The invention according to claim 1 is a pavement plate for preventing electromagnetic interference according to any one of claims 1 to 4, wherein the concrete plate or the precast concrete plate is replaced with high-strength concrete. , Song Distribution Streak Is fiber reinforcement Charge It is characterized in that it is composed of a precast concrete plate with increased strength and reduced thickness.
[0034]
By configuring as described above, the required strength is maintained even when there is a restriction that the thickness of the surface layer and the precast concrete plate must be reduced to a predetermined thickness in addition to the functions and effects of the invention described above. The precast concrete slab with reduced thickness can be used well.
[0035]
Claim 6 In the paving plate for preventing electromagnetic interference according to any one of claims 1 to 5, Inside the top layer Buried snow melting pipes, A nozzle branched from the snow melting pipe is provided, and water from the snow melting pipe is sprinkled on the upper surface of the uppermost layer by the nozzle. It is characterized by a watering snow melting system.
[0036]
By configuring as described above, in addition to the functions and effects of the above-described invention, in cold districts and the like, snow is removed from the pavement surface of the surface layer by snowfall, etc. It can prevent that the performance of the surface layer which acts has fallen.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment relating to a pavement plate for preventing electromagnetic interference according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a schematic configuration of an automatic toll collection system for a toll road constructed using a pavement plate for preventing electromagnetic interference according to an embodiment of the present invention.
[0038]
In this automatic toll collection system, each automatic toll collection device 12 is arranged in a toll gate 10 installed at a predetermined location on a toll road corresponding to each traveling lane on the toll road.
[0039]
The automatic toll collection device 12 includes a vehicle detection radar and a wireless communication device. In this automatic toll collection device 12, a radar millimeter wave is emitted from the vehicle detection radar to a predetermined range on the front side of the toll gate 10, and the vehicle 14 has arrived at a predetermined position on the front side of the toll gate 10. It is configured to detect.
[0040]
Further, when the automatic toll collection device 12 detects that the vehicle 14 has arrived at a predetermined position on the road lane by the vehicle detection radar, the automatic toll collection device 12 emits a communication signal MW from the wireless communication device of the automatic toll collection device 12. Then, a signal is transmitted to the traveling vehicle 14.
[0041]
The vehicle 14 is equipped with an automatic fee payment device (not shown), and this automatic fee payment device receives the communication signal MW from the wireless communication device of the automatic fee collection device 12. Then, the automatic toll payment device transmits information (vehicle type, weight, model, registration number, etc.) necessary for collecting the toll for the vehicle 14 by wireless communication.
[0042]
The automatic toll collection device 12 that has received the information necessary for determining the toll of the vehicle 14 calculates the toll based on the distance traveled by the car on the toll road and executes toll collection processing.
[0043]
In the automatic toll collection system described above, at least a predetermined range in which a communication signal MW that is a radio wave of a frequency band of, for example, 5.8 GHz emitted from a wireless communication apparatus of the automatic toll collection apparatus 12 is irradiated, and an automatic charge An electromagnetic wave absorption characteristic having a characteristic of absorbing a low-intensity electromagnetic wave for communication, detection, or measurement in a portion of a road that extends over a predetermined range irradiated with a millimeter wave emitted from a vehicle detection radar of the receiving device 12 It is constructed using a precast concrete pavement plate 15 as an electromagnetic wave absorbing material having
[0044]
As a result, the operation of wireless communication or vehicle detection is hindered by radio waves that are unnecessarily reflected on the road surface, and electromagnetic interference that hinders operations such as toll collection is suppressed.
[0045]
For this reason, the precast concrete pavement plate 15 as a road having a pavement structure having a function of absorbing low-intensity electromagnetic waves for communication, detection or measurement is configured in each structure shown in FIGS.
[0046]
The road shown in FIG. 2 is configured by disposing an electromagnetic wave reflection reducing surface layer 16 at the most surface portion of the road, and disposing a precast concrete plate 18 thereunder. The road portion other than the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18 is provided with a general paved road 20 structure.
[0047]
The electromagnetic wave reflection reducing surface layer 16 is made of a low-density, low-dielectric constant material such as porous concrete or a porous asphalt mixture.
[0048]
The porous concrete or porous asphalt mixture constituting the electromagnetic wave reflection reducing surface layer 16 has a structure with many voids, such as a porous structure that prevents the outflow of soil particles but allows only water to flow freely. It has become.
[0049]
That is, the electromagnetic wave reflection reducing surface layer 16 composed of porous concrete or a porous asphalt mixture has an electrical property intermediate between that of normal concrete or asphalt surface and air, or is more air than that of normal concrete or asphalt surface. Therefore, the dielectric constant is smaller than that of ordinary solid concrete, so that the reflection of electromagnetic waves on the surface can be suppressed and the incidence of electromagnetic waves can be facilitated.
[0050]
At the same time, when there is rain on the porous concrete or porous asphalt mixture constituting the electromagnetic wave reflection reducing surface layer 16, the rainwater is quickly drained through a large number of gaps in the porous concrete or porous asphalt mixture. It can suppress that it stagnates on the surface of a porous asphalt mixture, and can reduce that an electromagnetic wave reflects in the surface of the electromagnetic wave reflection reduction surface layer 16 at the time of rainfall.
[0051]
The electromagnetic wave reflection reduction surface layer 16 has a void ratio n in order to reduce the reflection of radio waves in the porous concrete or porous asphalt mixture used for this. _a (Volume V occupied by air or other gas in porous concrete or porous asphalt mixture _a To the total volume V of porous concrete or porous asphalt mixture, ie n _a = V _a / V × 100 [%]) is preferable because the dielectric constant decreases.
[0052]
At the same time, the electromagnetic wave reflection reducing surface layer 16 needs to have mechanical characteristics as road pavement.
[0053]
Considering the above, the porous concrete or porous asphalt mixture used for the electromagnetic wave reflection reducing surface layer 16 has a void ratio n. _a Is preferably 40% or less.
[0054]
Further, in the electromagnetic wave reflection reducing surface layer 16, when it is necessary to further suppress reflection on the surface, the electromagnetic wave reflection reducing surface layer 16 is configured to gradually reduce the dielectric constant from the roadbed side toward the surface. .
[0055]
In order to change the dielectric constant of the electromagnetic wave reflection reducing surface layer 16, the density (such as porosity) is changed in the layer. Alternatively, the electromagnetic wave reflection reducing surface layer 16 may be configured by stacking a plurality of layers having different densities so that the density gradually decreases from the roadbed side toward the surface.
[0056]
Further, as another configuration of the electromagnetic wave reflection reducing surface layer 16, a material having an electromagnetic wave absorbing function is added to porous concrete or a porous asphalt mixture. That is, a part or the whole of the electromagnetic wave reflection reducing surface layer 16 is made of a material obtained by mixing an appropriate amount of a conductive material such as carbon fiber or a magnetic material such as ferrite powder into porous concrete or a porous asphalt mixture.
[0057]
The electromagnetic wave reflection reducing surface layer 16 having the electromagnetic wave absorbing function is an electromagnetic wave absorbing function (energy attenuation) in which a conductive radio wave absorbing material or a magnetic radio wave absorbing material is mixed alone or in combination with a material such as porous concrete or a porous asphalt mixture. It is comprised with the electromagnetic wave absorption material which has this.
[0058]
The conductive electromagnetic wave absorbing material, which is a dielectric material used here, is preferably a highly durable metal material such as a carbon material or stainless steel, and these materials are used in the form of fibers, beads, powders, or the like. .
[0059]
Moreover, as magnetic materials, such as a magnetic wave absorption material used here, a ferrite, a permalloy, etc. are used, for example in a granular form, a powder form, a linear form, or a plate form.
[0060]
Next, the electromagnetic wave reflection reducing surface layer 16 is made of an electromagnetic wave absorber as a conductive electromagnetic wave absorbing material (conductive fiber such as carbon fiber as an electromagnetic wave absorber, that is, one that absorbs incident electromagnetic waves and causes resistance loss, It is composed of an electromagnetic wave absorbing material using a granular material having an electromagnetic wave absorption characteristic to which a so-called Joule heat loss property that converts the energy of heat into a heat and an energy loss caused by an induced current is added) The case will be described.
[0061]
The electromagnetic wave absorber to be added to the particulate material for constituting the electromagnetic wave reflection reducing surface layer 16 is carbon fiber (carpon fiber) which is a conductive fiber, metal fiber such as carpon-containing fiber, needle carpon, stainless steel, etc. May be used. In particular, when carbon fiber is used, it has high environmental resistance and durability, so that it can be prevented from being affected by the climate such as rainfall and snowfall.
[0062]
Next, the length of the carbon fibers when the electromagnetic wave reflection reducing surface layer 16 is configured by adding carbon fibers that are electromagnetic wave absorbers will be described.
[0063]
In order to expect a resistance loss when an electromagnetic wave is incident on the carbon fiber, the length (L) of the carbon fiber with respect to the wavelength λ of the electromagnetic wave to be absorbed (in a vacuum) is L = 2λ / n (n is An integer) is preferable.
[0064]
Actually, in consideration of the wavelength shortening effect due to the electrical characteristics such as the dielectric constant of the radio wave absorption layer, it is preferable to set the wavelength to be absorbed to 1/10 or more. In addition, when fibers longer than one construction thickness are used, uneven distribution of fibers tends to occur after construction, so the maximum length is equal to or less than one construction thickness (in the case of asphalt pavement, usually 30-50 mm). Degree).
[0065]
In addition, a radio wave reflection layer is provided on the back surface of the radio wave absorption layer by using a carbon fiber mesh, a sheet, a metal mesh, and a metal foil. You may comprise so that it may pass along a path | route and a radio wave absorption layer may absorb more radio waves. It is also possible to use the reinforcing bars in the precast concrete slab as a reflective layer.
[0066]
As described above, the electromagnetic wave reflection reducing surface layer 16 is provided with an electromagnetic wave absorbing function, and the electromagnetic wave reflection reducing surface layer 16 is further reduced from reflecting unnecessary electromagnetic waves.
[0067]
Furthermore, when it is necessary to further suppress reflection on the surface of the electromagnetic wave reflection reducing surface layer 16, mixing of a conductive material such as carbon fiber or a magnetic material such as ferrite powder from the roadbed side toward the surface in the layer. It is configured by changing the amount to gradually decrease.
[0068]
Further, the electromagnetic wave reflection reducing surface layer 16 has a plurality of layers with different amounts of mixed conductive materials such as carbon fibers and magnetic materials such as ferrite powders on the surface from the roadbed side in order to suppress reflection of electromagnetic waves on the surface. Alternatively, the electromagnetic wave reflection reducing surface layer 16 may be formed by layering the conductive material such as carbon fiber and the magnetic material such as ferrite powder in order of decreasing amounts.
[0069]
The precast concrete plate 18 disposed under the electromagnetic wave reflection reducing surface layer 16 is configured as a normal precast concrete plate for road pavement. Note that a concrete cast placed on site may be provided on the roadbed and replaced with the precast concrete plate 18.
[0070]
Further, the precast concrete plate 18 is configured so that an appropriate amount of a conductive material such as carbon fiber or a magnetic material such as ferrite powder is mixed in a part or the whole of the precast concrete plate 18 so as to take in more electromagnetic waves and enhance the electromagnetic wave absorption effect. May be.
[0071]
Thereby, since the electromagnetic wave absorbing function is imparted to the precast concrete slab 18, the harmful effects due to the unnecessary electromagnetic waves can be further reduced in combination with the electromagnetic wave reflection reducing action of the electromagnetic wave reflection reducing surface layer 16.
[0072]
Next, the precast concrete pavement plate 15 shown in FIG. 3 will be described.
[0073]
This precast concrete pavement plate 15 is constituted by a radio wave reflection reducing surface layer 22 in which the outermost surface layer of the electromagnetic wave reflection reducing surface layer 16 is formed of a low dielectric constant material. The radio wave reflection reducing surface layer 22 is made of a low-density, low-dielectric constant material such as porous concrete or porous asphalt mixture.
[0074]
An electromagnetic wave absorbing layer 24 is disposed below the radio wave reflection reducing surface layer 22. The electromagnetic wave absorbing layer 24 is an electromagnetic wave absorbing material having an electromagnetic wave absorbing function (energy attenuation) obtained by mixing a conductive wave absorbing material or a magnetic wave absorbing material alone or in combination with a material such as porous concrete or a porous asphalt mixture. Form.
[0075]
Further, a precast concrete plate 18 is disposed below the electromagnetic wave absorbing layer 24 to constitute the precast concrete pavement plate 15.
[0076]
By comprising in this way, reflection of an electromagnetic wave can be suppressed more by the electric wave reflection reduction surface layer 22 of the surface of the precast concrete pavement plate 15, and electromagnetic waves can be absorbed by the electromagnetic wave absorption layer 24 thereunder.
[0077]
Next, the precast concrete pavement plate 15 shown in FIG. 4 will be described.
[0078]
This precast concrete pavement plate 15 is constituted by a radio wave reflection reducing surface layer 22 in which the outermost surface layer of the electromagnetic wave reflection reducing surface layer 16 is formed of a low dielectric constant material.
[0079]
An electromagnetic wave absorbing layer 24 is disposed below the radio wave reflection reducing surface layer 22.
[0080]
Further, at the lower part of the electromagnetic wave absorbing layer 24, a layered predetermined range portion adjacent to the electromagnetic wave absorbing layer 24 of the precast concrete plate 18 is used as a concrete material, and a conductive wave absorbing material or a magnetic wave absorbing material is used alone or in combination. The electromagnetic wave absorbing precast concrete plate portion 26 having an electromagnetic wave absorbing function (energy attenuation) mixed in is formed.
[0081]
Further, the precast concrete pavement plate 15 is formed by integrally forming a precast concrete plate 18 portion having a normal configuration in the lower portion of the electromagnetic wave absorbing precast concrete plate portion 26.
[0082]
Next, the precast concrete pavement plate 15 shown in FIGS. 5 and 6 will be described.
[0083]
The precast concrete paving slab 15 is configured by disposing fitting structures 28 on the boundary between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete slab 18 so as to be distributed at equal intervals. That is, the uneven part which provided the uneven | corrugated shape on the upper surface of the precast concrete plate 18 is provided.
[0084]
As the planar shape of the concavo-convex portion in the fitting structure portion 28, an appropriate shape is selected from a planar shape such as a circle, an ellipse, a star, a square, or a rectangle. In addition, the cross-sectional shape of the fitting structure portion 28 is formed by selecting an appropriate shape such as a trapezoid, a rectangle, a rectangle, or a curved surface.
[0085]
For example, when the fitting structure portion 28 is formed in a concave groove that is perpendicular to the traveling direction of the vehicle, the electromagnetic wave reflection reducing surface layer due to vehicle loading (horizontal force) passing over the precast concrete pavement plate 15 It is possible to prevent peeling between layers or slippage due to a shearing force acting between 16 and the precast concrete plate 18.
[0086]
When configured in this manner, the groove width B of the fitting structure portion 28 is preferably equal to or greater than the maximum dimension of the aggregate in the material forming the electromagnetic wave reflection reducing surface layer 16 portion. Thereby, peeling and slippage between the surface layer portion and the concrete plate layer can be effectively prevented by loading the passing vehicle. Here, sand, gravel, crushed sand, crushed stone and other similar granular materials are used as the aggregate. This aggregate should be clean, strong, durable, of suitable viscosity and free from harmful substances.
[0087]
Further, as illustrated in FIG. 5 to FIG. 7, a direction (road width direction) orthogonal to the traveling direction of the vehicle in the precast concrete paving plate 15 at the boundary between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18. An uneven portion having a configuration that can also serve as a function of the fitting structure portion 28 extending in the direction is formed, and the recessed portion is formed in the drainage groove 28A.
[0088]
At the same time, the precast concrete paving slab 15 constituting the road is formed into a mountain shape with the cross-section in the width direction of the road, with the center in the width direction as the apex, and a drainage gradient descending from the center in the width direction toward the shoulders on both sides. Apply 1 to 3%.
[0089]
Further, a drainage groove 30 extending along the road is provided at the shoulder portion of the road in which the drainage groove 28A is formed, and rainwater flowing out from each drainage groove 28A is guided to a drainage place and drained into sewage or the like.
[0090]
According to this configuration, when the electromagnetic wave reflection reducing surface layer 16 is covered with water due to rain or the like, rainwater that has permeated the electromagnetic wave reflection reducing surface layer 16 flows out to the drainage groove 30 by the drainage gradient of each drainage groove 28A. Therefore, the drainage treatment inside the pavement can be performed quickly, and a significant decrease in radio wave absorption performance due to rainfall or the like can be prevented.
[0091]
Further, as illustrated in FIG. 14, an electromagnetic wave reflection reducing structure may be disposed at a boundary portion between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18. This electromagnetic wave reflection reducing structure is formed by making the boundary portion between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18 into an uneven shape having an isosceles trapezoidal cross section (or may be a triangular cross section).
[0092]
Further, when the electromagnetic wave is multiple-reflected by the uneven surface in the electromagnetic wave reflection reducing structure, the width B1 and the depth H1 of the isosceles trapezoidal shape of the cross section of the electromagnetic wave reflection reducing structure should be equal to or greater than the wavelength of the target electromagnetic wave. preferable. Here, when the target electromagnetic wave is 5.8 GHz, the wavelength is about 5.15 cm. Therefore, the width B1 and the depth H1 are set to 5.5 cm or more, respectively.
[0093]
By configuring in this way, as shown in FIG. 14, the electromagnetic wave W incident on the surface of the electromagnetic wave reflection reducing surface layer 16 is reflected (multiple times) by each slope of the isosceles trapezoidal section in the precast concrete plate 18. Can be attenuated. Further, by making the incident angle of the electromagnetic wave W incident on each inclined surface of the isosceles trapezoidal shape in the precast concrete plate 18 vertical (perpendicular incidence), reflection of the electromagnetic wave can be reduced.
[0094]
Further, the boundary portion provided with the uneven shape of the cross-section isosceles trapezoid shape (which may be a triangular cross-section) between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18 is the concrete material of the precast concrete plate 18 and its cross-section isosceles. It becomes an intermediate dielectric constant with a low-density, low-dielectric constant material such as porous concrete or porous asphalt mixture of the electromagnetic wave reflection reducing surface layer 16 filled in the trapezoidal shape (which may be triangular in section).
[0095]
Therefore, the width H of the depth H of the electromagnetic wave reflection reducing structure between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18 is compared with the case where the boundary portion is a flat surface having an isosceles trapezoidal shape (which may be a triangular shape). Thus, the change in dielectric constant at the boundary portion having a gradual transition can be reduced, and the reflection of electromagnetic waves on the surface interface between the boundary surface of the electromagnetic wave reflection reducing surface layer 16 and the boundary surface between the precast concrete plate 18 can be reduced.
[0096]
Further, the boundary portion between the electromagnetic wave reflection reducing surface layer 16 and the precast concrete plate 18 has an inclined characteristic of an isosceles trapezoidal cross section (may be a triangular cross section), so that the dielectric constant also has an inclination characteristic. Can suppress the reflection of electromagnetic waves.
[0097]
In addition, when the precast concrete plate 18 is made of a material having an electromagnetic wave absorbing action, the action of reducing the reflection of the electromagnetic wave can be improved.
[0098]
Further, the electromagnetic wave reflection reducing structure has a cross-section isosceles trapezoidal shape (cross-section) extending with a drainage gradient descending in a direction (width direction of the road) perpendicular to the traveling direction of the vehicle in the precast concrete pavement plate 15 as described above. The concave / convex portion may be a triangular shape), and the drainage hole 29 is formed at the bottom of the concave portion while also serving as the fitting structure portion 28.
[0099]
In this electromagnetic wave reflection reducing structure, a marker 31 for informing the pavement time of the road may be arranged on the top surface of the convex portion having an isosceles trapezoidal shape (may be triangular).
[0100]
When the marker 31 for informing the road pavement time is arranged in this way, the electromagnetic wave reflection reducing surface layer 16 is gradually worn away from the surface as the vehicle travels on the road, and the marker 31 appears on the surface of the road. It can be used as a guideline for performing maintenance and repair work on the pavement of the electromagnetic wave reflection reducing surface layer 16 on this road.
[0101]
Next, this precast concrete pavement plate 15 can be configured to incorporate a snow melting system therein. As this snow melting system, although not shown, for example, a water spray snow removing system can be incorporated.
[0102]
This sprinkling snow-snowing system is a snow-smelting pipe (snow-melting pipe) in which a large amount of ground water or surface water such as a river flows through a precast concrete pavement plate 15 and a nozzle portion for sprinkling water on the electromagnetic wave reflection reducing surface layer 16 is provided. To embed.
[0103]
In this way, if the pre-cast concrete pavement plate 15 is equipped with a water spraying and snow-removing system, the snow is removed so that snow does not accumulate or freeze on the pavement surface of the electromagnetic wave reflection reducing surface layer 16 due to snowfall or the like in cold regions. It can prevent that the electromagnetic wave absorption performance of the reduction | decrease surface layer 16 falls.
[0104]
Next, a construction method for improving an existing concrete pavement to a precast concrete pavement plate 15 for preventing electromagnetic interference will be described.
[0105]
As shown in FIG. 8, the existing surface layer 32 on the existing precast concrete slab (existing concrete slab) 34 is an asphalt pavement or a semi-flexible pavement (a pavement in which cement paste is injected into the surface of the asphalt mixture to increase its rigidity. It is constructed with asphalt pavement and cement concrete pavement, and can be replaced with the electromagnetic wave reflection reducing surface layer 16 (for example, the thickness of the existing surface layer 32 and the electromagnetic wave reflection reducing surface layer 16 is In the same case), as shown in FIG. 9, the existing surface layer 32 is cut, and the electromagnetic wave reflection reducing surface layer 16 is newly paved on the existing precast concrete plate (existing concrete plate) 34.
[0106]
Next, as shown in FIG. 10, even if an existing surface layer 36 of asphalt pavement or semi-flexible pavement is constructed on an existing precast concrete plate (existing concrete plate) 34, the thickness of the existing surface layer 36 is If the thickness is less than the thickness required for constructing the electromagnetic wave reflection reducing surface layer 16, the road surface height is limited and the construction by overlay is inappropriate, so the replacement method as one of the maintenance and repair methods is used. .
[0107]
In this replacement method, the existing precast concrete slab (existing concrete slab) 34 is removed, the high-strength concrete is used, the bending reinforcement 40 is used, or the fiber reinforced material is used to form a thin concrete slab portion. Also, a precast concrete plate 38 (for example, RC) whose strength is increased so that the bending strength is equal to or higher than that of the existing precast concrete plate (existing concrete plate) 34 is newly laid.
[0108]
The precast concrete plate 38 with increased strength is designed so that a reinforcing material is disposed on the tensile side of the cross section so that all the tensile stress is borne by the reinforcing material, and the concrete structure is thin.
[0109]
And while improving this bending strength, the electromagnetic wave reflection reduction surface layer 16 is constructed | assembled on the precast concrete plate 38 which reduced thickness, and construction is completed. The thicknesses of the precast concrete plate 38 and the electromagnetic wave reflection reducing surface layer 16 that have been constructed in this manner and the electromagnetic wave reflection reducing surface layer 16 are configured to be equal to the thicknesses of the existing precast concrete plate (existing concrete plate) 34 and the existing surface layer 36.
[0110]
According to such a replacement method, construction is performed so that only a part of the place where the existing precast concrete plate (existing concrete plate) 34 and the existing surface layer 36 are laid is improved to the precast concrete pavement plate 15 for preventing electromagnetic interference. it can.
[0111]
Next, as shown in FIG. 12, the replacement method is also used when only the existing precast concrete slab (existing concrete slab) 34 is constructed.
[0112]
In this replacement method, the existing precast concrete slab (existing concrete slab) 34 is removed, the high-strength concrete is used, the bending reinforcement 40 is used, or the fiber reinforced material is used to form a thin concrete slab portion. Also, a precast concrete plate 38 having a higher strength so that the bending strength is equal to or higher than that of the existing precast concrete plate (existing concrete plate) 34 is newly laid.
[0113]
And while improving this bending strength, the electromagnetic wave reflection reduction surface layer 16 is constructed | assembled on the precast concrete plate 38 which reduced thickness, and construction is completed. The thicknesses of the precast concrete plate 38 and the electromagnetic wave reflection reducing surface layer 16 that have been constructed in this way and have increased strength are configured to be equal to the thickness of the existing precast concrete plate (existing concrete plate) 34.
[0114]
According to such a replacement method, it is possible to perform construction so that only a part of the place where the existing precast concrete plate (existing concrete plate) 34 is laid is improved to the precast concrete pavement plate 15 for preventing electromagnetic interference.
[0115]
Further, the precast concrete pavement plate 15 described above is manufactured by previously constructing and integrating a radio wave absorption surface layer such as the electromagnetic wave reflection reducing surface layer 16 on the precast concrete plate 18 at a factory or the like. By using a construction method that transports and installs the product of the product to the site, it will be provided with the required quality before the concrete that has been constructed on site and is finished being put into service, and it is also low temperature, dry, and rapid temperature In order to protect against harmful effects such as change and impact, and to sufficiently accelerate the hardening of concrete, the construction period can be shortened as compared with a construction method that requires curing on site.
[0116]
At the same time, after the precast concrete paving slab 15 is manufactured at the factory, the radio wave absorption performance of this product can be easily measured and managed, so that reliable quality control is possible.
[0117]
In the case of manufacturing a precast concrete pavement plate 15 having an electromagnetic wave absorption function (energy attenuation), the electromagnetic wave depends on the thickness of the electromagnetic wave reflection reducing surface layer 16 and the dispersion state when carbon fiber or the like as a radio wave absorber is mixed. Absorption performance and frequency characteristics of absorbed electromagnetic waves change.
[0118]
Therefore, advanced construction quality control (accuracy and testing) is required for the manufacturing work, and equipment and facilities for measurement or testing are required. Therefore, if such a device for measuring or testing is provided in the manufacturing plant of the precast concrete paving plate 15, the product of the precast concrete paving plate 15 can be easily measured or tested immediately after manufacturing.
[0119]
In this way, compared with the case where the electromagnetic wave reflection reducing surface layer 16 is constructed and constructed on the precast concrete slab 18 placed on site, it is not necessary to carry a measuring or testing device to the site. As a result, the precast concrete pavement plate 15 can be manufactured quickly and easily at a low price, and the high quality precast concrete pavement plate 15 can be provided by strictly controlling the construction quality.
[0120]
In the above-described embodiment, the configuration in which the precast concrete pavement plate 15 having the electromagnetic wave reflection reduction function is installed on a portion of the road or the like where the automatic toll collection system is installed has been described, but the present invention is not limited to this. Rather, it can be used to construct a road structure for preventing electromagnetic interference on the automobile driving support system by adding a lane marker for the automobile driving assistance system to the configuration related to the precast concrete pavement plate 15. is there.
[0121]
【The invention's effect】
In the pavement plate for preventing electromagnetic interference of the present invention, first, the electromagnetic wave reflection reducing surface layer provided on the upper part of the concrete plate is composed of a low-density, low-dielectric constant material such as porous concrete or porous asphalt mixture. Porous concrete or porous asphalt mixture is porous and has a lot of voids, so it has electrical properties intermediate between normal concrete or asphalt surface and air, so the surface of the surface layer is reduced by permittivity. The generation of unnecessary scattered electromagnetic waves can be suppressed by preventing the electromagnetic waves from being reflected and making the electromagnetic waves easily enter the surface layer.
[0122]
In addition, when there is rainfall on the surface layer, the rainwater can be quickly drained through a large number of gaps in the porous concrete or porous asphalt mixture, and can be prevented from stagnating. Therefore, it is possible to reduce the reflection of electromagnetic waves due to stagnant water.
[0123]
Therefore, if the pavement plate for preventing this electromagnetic wave interference is laid on the road of a communication system or a control system using radio waves, it is possible to prevent the interference of communication due to unnecessary radio wave reflection and ensure the reliability of the system. effective.
[0124]
Second, a single conductive or magnetic wave absorbing material having the property of absorbing low-intensity electromagnetic waves for communication, detection or measurement with a low-density and low-dielectric constant material such as porous concrete or porous asphalt mixture. An electromagnetic wave reflection reducing surface layer made of a material mixed with an electromagnetic wave absorbing material mixed in or in combination is provided on the upper part of the concrete plate.
[0125]
As a result, porous concrete or porous asphalt mixture has an electrical property between the surface of normal concrete or asphalt and air, because it is porous and has a lot of voids. Generation of unnecessary scattered electromagnetic waves can be suppressed by preventing electromagnetic waves from being reflected on the surface of the surface layer and allowing the electromagnetic waves to easily enter the surface layer.
[0126]
Further, the electromagnetic wave incident on the surface layer is absorbed by resistance loss by the electromagnetic wave absorbing material mixed in the surface layer, so-called Joule heat loss that converts the energy of the electromagnetic wave into heat, or energy loss due to induced current.
[0127]
Therefore, it is possible to reduce the electromagnetic wave reflected on the surface layer, and the electromagnetic wave reflected once on the surface of the concrete plate after entering the surface layer and released to the outside of the surface layer again.
[0128]
In addition, when there is rainfall on the surface layer, the rainwater can be quickly drained through a large number of gaps in the porous concrete or porous asphalt mixture, and can be prevented from stagnating. Therefore, it is possible to reduce the reflection of electromagnetic waves due to stagnant water.
[0129]
Therefore, if the pavement plate for preventing this electromagnetic wave interference is laid on the road of a communication system or a control system using radio waves, it is possible to prevent the interference of communication due to unnecessary radio wave reflection and ensure the reliability of the system. effective.
[0130]
Third, an electromagnetic wave reflection reducing surface layer composed of a material having a low density and a low dielectric constant such as porous concrete or porous asphalt mixture is the outermost surface layer, and porous concrete or porous asphalt mixture or the like is placed under the electromagnetic wave reflection reducing surface layer. Mixing a material with a low dielectric constant at a density and an electromagnetic wave absorbing material mixed with a conductive wave absorbing material or magnetic wave absorbing material having a characteristic of absorbing low-intensity electromagnetic waves for communication, detection or measurement. A precast concrete pavement plate is formed by arranging an electromagnetic wave reflection reducing surface layer made of the above-described material on the top of the precast concrete plate.
[0131]
As a result, since the porous concrete or porous asphalt mixture that constitutes the surface layer on the outermost surface has a porous structure, there are many voids, and it has electrical characteristics intermediate between the surface layer of normal concrete or asphalt and air, The generation of unnecessary scattered electromagnetic waves can be suppressed by reducing the dielectric constant, preventing reflection of electromagnetic waves on the surface of the surface layer, and making the electromagnetic waves incident on the surface layer very easily.
[0132]
Furthermore, the electromagnetic wave incident on the outermost surface layer is more efficient due to resistance loss due to the electromagnetic wave absorbing material mixed in the lower surface layer, so-called Joule heat loss that converts electromagnetic wave energy into heat, or energy loss due to induced current. Absorbed.
[0133]
For this reason, electromagnetic waves are most likely to be incident on the surface layer to suppress reflection, and electromagnetic waves that have once entered the surface layer can be efficiently absorbed by the next surface layer, so that the electromagnetic wave is reflected by the surface layer and once enters the surface layer. Then, the electromagnetic wave reflected on the surface of the concrete plate and released to the outside of the surface layer can be greatly reduced.
[0134]
In addition, when there is rainfall on the surface layer, the rainwater can be quickly drained through a large number of gaps in the porous concrete or porous asphalt mixture, and can be prevented from stagnating. Therefore, it is possible to reduce the reflection of electromagnetic waves due to stagnant water.
[0135]
Therefore, if the pavement plate for preventing this electromagnetic wave interference is laid on the road of a communication system or a control system using radio waves, it is possible to prevent the interference of communication due to unnecessary radio wave reflection and ensure the reliability of the system. effective.
[0136]
In addition, precast concrete paving slabs can be manufactured at a factory, etc. by constructing and integrating a surface layer such as an electromagnetic wave reflection reducing surface layer on the precast concrete slab, and transporting it to the site for installation. Compared to construction and curing at the site, the construction period can be shortened and the construction can be made inexpensively.
[0137]
Furthermore, after the precast concrete paving slab is manufactured at the factory, the radio wave absorption performance of this product can be easily measured and managed, so that there is an effect that reliable quality control can be performed.
[0138]
Fourthly, electromagnetic wave absorption in which a concrete plate or a precast concrete plate is mixed with a conductive wave absorbing material or a magnetic wave absorbing material having a characteristic of absorbing low-intensity electromagnetic waves for communication, detection or measurement, alone or in combination. A precast concrete plate portion is provided and configured.
[0139]
Thereby, there is an effect that the electromagnetic wave absorbing material mixed in the precast concrete plate itself can be more efficiently absorbed by resistance loss, so-called Joule heat loss for converting electromagnetic wave energy into heat, or energy loss due to induced current.
[0140]
Fifth, because the concave and convex fitting structures are arranged at equal intervals at the boundary between the concrete plate or the precast concrete plate and the surface layer, the vehicle is placed on the precast concrete paving plate. When the vehicle passes, the effect of shearing force acting between the surface layer and the concrete plate due to the load (horizontal force) of the vehicle can prevent peeling and slipping between the layers. is there.
[0141]
Sixth, the concrete plate or the precast concrete plate is composed of a precast concrete plate with a reduced thickness by using high-strength concrete, using bending reinforcement, or using fiber reinforcement material, etc. Therefore, even when there is a restriction that the thickness of the surface layer and the precast concrete plate must be reduced to a predetermined thickness, there is an effect that the precast concrete plate with the reduced thickness can be satisfactorily handled while maintaining the required strength. .
[0142]
Seventh, by embedding a snowmelt pipe for a snowmelt system to prevent snow accumulation or icing on the electromagnetic wave reflection reducing surface layer, it is constructed on the pavement surface of the surface layer by snowfall or the like in cold regions. There is an effect that it is possible to prevent the performance of the surface layer exhibiting the electromagnetic wave reflection reducing action from deteriorating by eliminating the snow so that it does not accumulate or freeze.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of an automatic toll collection system in which a predetermined portion of a road is constructed using a paving plate for preventing electromagnetic interference according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part showing a configuration of a part of a road road having an electromagnetic wave reflection reducing surface layer according to an embodiment of the pavement plate for preventing electromagnetic wave interference of the present invention.
FIG. 3 is an enlarged cross-sectional view of a main part showing a configuration of a part of a road having a radio wave reflection reducing surface layer and an electromagnetic wave absorption layer according to an embodiment of a pavement plate for preventing electromagnetic interference according to the present invention.
FIG. 4 is an enlarged view of an essential part showing a configuration of a part of a road having a radio wave reflection reducing surface layer, an electromagnetic wave absorbing layer, and an electromagnetic wave absorbing precast concrete plate portion according to an embodiment of the pavement plate for preventing electromagnetic interference according to the present invention. It is sectional drawing.
FIG. 5 is a main portion showing a configuration of a part of a road in which a fitting structure portion is provided between a radio wave reflection reducing surface layer and an electromagnetic wave absorption layer according to an embodiment of a pavement plate for preventing electromagnetic interference according to the present invention. It is an expanded sectional view.
FIG. 6 shows a part of a precast concrete plate relating to a road in which a fitting structure portion is provided between a radio wave reflection reducing surface layer and an electromagnetic wave absorbing layer according to an embodiment of the pavement plate for preventing electromagnetic interference according to the present invention. It is a principal part perspective view shown.
FIG. 7 is a cross-sectional view showing a schematic configuration of a road structure that can effectively prevent electromagnetic interference even during rainfall according to the embodiment of the pavement plate for preventing electromagnetic interference according to the present invention.
FIG. 8 is an enlarged cross-sectional view of a main part showing an existing surface layer constructed on an existing precast concrete plate (existing concrete plate) which is a conventional pavement plate.
FIG. 9 is an enlarged cross-sectional view of a main part showing a construction method for constructing an electromagnetic wave reflection reducing surface layer on an existing precast concrete plate (existing concrete plate) according to an embodiment of a pavement plate for preventing electromagnetic interference according to the present invention. It is.
FIG. 10 is an enlarged cross-sectional view of a main part showing a thin existing surface layer constructed on an existing precast concrete plate (existing concrete plate) which is a conventional pavement plate.
FIG. 11 is an enlarged cross-sectional view of a main part showing a construction method for constructing an electromagnetic wave reflection reducing surface layer on a precast concrete plate with increased strength according to an embodiment of a pavement plate for preventing electromagnetic interference according to the present invention. .
FIG. 12 is an enlarged cross-sectional view of a main part showing an existing precast concrete plate (existing concrete plate) which is a conventional pavement plate.
FIG. 13 is an enlarged cross-sectional view of a main part showing a construction method for constructing an electromagnetic wave reflection reducing surface layer on a precast concrete plate with increased strength according to an embodiment of a construction method of a pavement plate for preventing electromagnetic interference according to the present invention. FIG.
FIG. 14 is an enlarged cross-sectional view of a main part showing a configuration in which an electromagnetic wave reflection reducing structure is arranged at a boundary portion between an electromagnetic wave reflection reducing surface layer and a precast concrete plate according to an embodiment of a pavement plate for preventing electromagnetic wave interference according to the present invention. FIG.
[Explanation of symbols]
15 Precast concrete paving version
16 Electromagnetic wave reflection reduction surface layer
18 Precast concrete plate
20 Paved road
22 Radio wave reflection reduction surface layer
24 Electromagnetic wave absorption layer
26 Electromagnetic wave absorption precast concrete plate part
28 Fitting structure
28A Drainage channel
30 Drainage channel
38 Precast concrete plate
40 Reinforcement

Claims (6)

The low dielectric constant of the material at a low density of porous concrete or porous asphalt mixture, communication, detection or conductive wave absorbing material that absorb electromagnetic waves of low intensity for measurement or magnetic wave absorbing material, alone or in combination contaminating mixed electromagnetic wave reflection reducing surface layer of the electromagnetic wave absorbing material, disposed above the concrete panel,
A paving slab for preventing electromagnetic interference, wherein an electromagnetic wave reflecting layer is provided on the back surface of the electromagnetic wave reflection reducing surface layer . The porous layer composed of low density and low dielectric constant material of porous concrete or porous asphalt mixture is the outermost layer ,
The low dielectric constant of the material at a low density of porous concrete or porous asphalt mixture, communication, detection or conductive wave absorbing material that absorb electromagnetic waves of low intensity for measurement or magnetic wave absorbing material, alone or in combination contaminating mixed electromagnetic wave reflection reducing surface layer of the electromagnetic wave absorbing material, disposed between said porous layer and the flop-les-cast concrete panel,
A paving slab for preventing electromagnetic interference, wherein an electromagnetic wave reflecting layer is provided on the back surface of the electromagnetic wave reflection reducing surface layer . Some of the concrete panel or the precast concrete plate, the conductive wave absorbing material or the magnetic wave absorbing material, the electromagnetic wave absorption precast concrete panel which is mixed alone or in combination provided,
The pavement plate for preventing electromagnetic interference according to claim 1 or 2 , wherein the electromagnetic wave reflection layer is provided on a back surface of the electromagnetic wave absorbing precast concrete plate. The surface layer of the concrete panel or the precast concrete plate, a recess in a direction perpendicular to the traveling direction of the vehicle, claims 1 to 3, between the electromagnetic wave reflection reducing surface and the recess has a drain hole shop Soban to prevent electromagnetic interference according to any one of. The concrete plate or the precast concrete plate, high strength concrete, the bending arrangement Sujimata using fiber reinforced materials, claims 1 to 4 which is constituted by thinned precast concrete plate thickness to increase the strength A pavement plate for preventing electromagnetic interference according to any one of the above. A snow-melting snow melting system is provided, wherein a snow- melting pipe is embedded in the uppermost layer, a nozzle branched from the snow-melting pipe is provided, and water from the snow-melting pipe is sprinkled on the upper surface of the uppermost layer by the nozzle. The pavement plate for preventing the electromagnetic wave interference of any one of Claim 5.

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