JPH0734408A - Road paving method - Google Patents

Abstract

PURPOSE:To increase snow melting effect by laying down an electric heater on a road bed, and depositing on it an asphalt mixed material into which heat conductive elements comprising small metal particles are mixed. CONSTITUTION:An electric heater 4 comprising coated electric wire such that it is stuck on an adhesive sheet is laied down on a road bed 2. Next an asphalt mixed material 3 into which metal particles comprising copper short fibers 5, etc., are mixed is laid down on it. Then, as required, multiple extreme irradiated radiation particles are fixed onto the surface of the adhesive sheet, and the electric heater 4 is fixed to the rear surface. Thus, because the heat conductivity of the asphalt layer is larger, production of local cooling area can be suppressed. Also it can be used for thick asphalt layer such as heavy vehicle road, etc., can save electrical cost, and can deposit easily at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road paving method. The road here includes all parts such as bridges and tunnels where people and automobiles pass.

[0002]

2. Description of the Related Art Freezing of roads and snowfall are major problems in Hokkaido, Tohoku, and the back Japan region. That is, the traffic is cut off,
People's lives are threatened or there is a risk of traffic accidents.

Therefore, conventionally, the snow on the road has been removed early in the morning by a snow removal vehicle or the like. However, this method does not work for things that work earlier than the snowplow or for moving cars,
Eventually everything would be after the snowplow. If the snow is removed from the road, it will not be melted and will be an obstacle, so it will take a lot of effort and time to transport it to the sea or river.

Further, since there are not many snow plows themselves, in a slow area (which is considered to have a relatively small amount of traffic), as described above, it is necessary to remove the snow by themselves, but up to a far road is manually operated. Is impossible.

Naturally, there are areas where such snowplows do not come, which is a serious problem for economic activities in winter.

[0006] Therefore, a method of spraying hot water on the road has been devised and implemented as a means for giving the road itself a function of preventing snow accumulation. However, it is pointed out that this method is dangerous because the hot water itself is frozen. As an alternative to this, a method of burying an electric heater in the ground near the road surface has been devised and implemented.

This is a method in which a hot wire heater is laid on the road before the asphalt material is laid on the asphalt pavement, and the asphalt is laid on it. According to this method, when electricity is passed through the heating wire, the surface temperature rises and the snow is melted.

[0008]

However, in this conventional method for burying electric wires, since ordinary asphalt is installed on the upper part of the electric heater, the melting efficiency (melting power) of snow or ice due to heat depends on the heat of the asphalt. Specified by transmission. The asphalt mixed material has a very small heat conductivity in the first place and can be said to be a heat insulating material.

Therefore, no matter how much heating is performed by the heater, the heat is blocked by the asphalt mixture, and the temperature of the road surface rises only slightly. Therefore, with the exposed electric heater, even if the amount of snow or the like that melts with a small amount of electricity, it is necessary to generate electricity in many times.

[0010]

[Means for Solving the Problems] In view of such a current situation,
The present inventor has completed the pavement method of the present invention as a result of earnest research, and the feature is that when asphalt pavement is performed, an electric heater is laid on the roadbed, and metal is processed into small pieces on it. The point is to construct an asphalt mixture that is a mixture of heat conductive elements.

The electric heater may be one for ordinary snow melting used in a snowfall area, and need not be a special one. Many of them consist of a heat generating part and a surrounding protection part that protects it.

The metal may be copper, aluminum or the like at a low cost, but other metal waste materials may be used.

The small piece is a short fiber shape, a scale shape, a small prism shape or the like, and the size is not particularly limited, and may be determined depending on the efficiency and the thickness of the asphalt to be constructed, but it is several meters.
The range of m to 10 mm is suitable. Among them, a copper wire (industrial waste) that has been replaced for a long time and is cut into an appropriate length can be suitably used from the viewpoint of reusing industrial waste and resource saving.

The mixing ratio of the heat conductive element is not particularly limited, but it is preferable that the mixing ratio is large as long as it does not affect the performance itself of the asphalt. However, adding it to some extent has an effect, so it may be determined in consideration of the strength of asphalt and the like. Normally, 0.1% by weight for metals
It is preferably about 20.0%. This amount may be adjusted depending on how much heat conductivity is required, traffic volume on the road, asphalt thickness, and the like.

The pavement method of the present invention does not require any special features as compared with ordinary asphalt pavement, and only the above-mentioned small pieces are mixed with asphalt. Therefore, the other methods are the same as the ordinary pavement method and will not be described in particular.

Further, in the usual method, it is troublesome to lay an electric heater, so that a method may be used in which an adhesive sheet to which a heater is fixed is placed below the asphalt mixture. This adhesive sheet is made of rubber and has a wall thickness of about 1 to 5 mm and has an adhesive force on both upper and lower surfaces, and a commercially available butyl sheet is suitable. Of course, the adhesive force may be one side or may not be rubber. A method of fixing a heating wire to this adhesive sheet, laying it, and connecting the cords is easy. In this case, it is possible to save time and labor for arranging the electric heater as a single wire at predetermined intervals each time, resulting in an extremely high efficiency.

Further, natural stone or ceramic particles (ground pebbles of natural pebbles or ceramics, particularly ceramic particles produced for emitting far infrared rays) which emits far infrared rays, which has been recently talked about, is added under the asphalt mixture. It can be placed on a part or the entire surface of the above, or can be fixed to the above-mentioned adhesive sheet. If it is made into a sheet like this, the laying construction is very easy. The effect of the present invention becomes more remarkable due to the synergistic effect when the far infrared ray emitting substance is used. That is, the emission of far infrared rays is further increased by the lower heating wire, and the heating effect is larger than that of a simple electric heater, so that the snow melting effect is improved.

If particles emitting far infrared rays are also fixed to the adhesive sheet, the construction itself can be carried out in the same manner as the case where only the heater is fixed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 is a schematic sectional view of a road paved by the paving method of the present invention. An asphalt mixed material 3 is laid on the roadbed 1 and the roadbed 2. Further, an electric heater 4 is embedded between the roadbed 2 and the asphalt mixture 3 as is done in Hokkaido and the like. In this example, short fibers (length 10 mm) 5 of a copper wire are mixed in the asphalt mixture 3 by 2% by weight (that is, 20 kg of copper wire per 1 ton of the mixture). Of course, the electric heater is covered with an insulating material. Others are entirely normal asphalt pavement. Regarding this, there were no problems regarding the pavement work or the performance of the road itself after completion.

As a comparative example, the same pavement as that shown in FIG. 1 was applied except that short copper fiber was not added. Of course, the same heater was used for the electric heater 4. Then, for both of them, the temperatures of the asphalt lower layer portion and the surface were measured.

In both cases, the temperature of the lower surface of the asphalt is 5
The temperature was maintained at 0 ° C., and the surface temperature was measured after 1 hour. One using the mixed material of the present invention has a temperature of 30 ° C.
Met. From this, it is clear that the mixed material of the present invention has very excellent thermal conductivity.

FIG. 2 shows a pressure sensitive adhesive sheet 1 used in the present invention.
It is sectional drawing which shows an example. The adhesive sheet body 6 has adhesiveness on both upper and lower surfaces. A large number of far-infrared radiation particles 7 are fixed to the front surface side, and an electric heater (a heating element is covered with a protective material to increase mechanical strength) 4 is fixed to the rear surface side. For example, instead of the electric heater 4 of FIG. 1, this is laid and used in the same portion.

[0023]

The paving method of the present invention described in detail above has the following advantages. Due to the high thermal conductivity of the asphalt layer, localized cooling zones are less likely to occur. Electricity cost of electric heater is reduced. Construction is very simple, just mix copper wires and so on. In terms of cost, it does not become much higher than the conventional one. Conventionally, it was said that the electric heater method is difficult to construct on heavy roads. This is because the asphalt layer becomes thicker in the case of a heavy road than in the case of a sidewalk, so that the heat conduction is poor and the surface temperature does not rise so much. However, in the paving method of the present invention, the electric heating method can be used even for a thick asphalt layer such as a heavy road. By using the far-infrared radiation particles, the electricity bill is further reduced and the temperature can be raised efficiently.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a road constructed by the method of the present invention.

FIG. 2 is a schematic sectional view showing an example of an adhesive sheet used in the method of the present invention.

[Explanation of symbols]

 1 Roadbed 2 Roadbed 3 Asphalt mixed material 4 Electric heater 5 Copper wire 6 Adhesive sheet body 7 Far-infrared radiation particles

Claims (3)

[Claims] 1. A method of paving a road, characterized in that, when asphalt paving, an electric heater is laid on a roadbed, and an asphalt mixed material mixed with a heat conductive element obtained by processing a metal into small pieces is applied thereon. 2. When asphalt paving, an adhesive sheet having an electric heater fixed to the back surface is laid on the roadbed, and an asphalt mixture material mixed with heat conductive elements processed into small pieces of metal is applied on the adhesive sheet. Road pavement method characterized by. 3. When asphalt paving, an adhesive sheet having an electric heater fixed to the back side and far infrared radiation particles fixed to the front side is laid on the roadbed, and a heat conductive element obtained by processing a metal into small pieces is mixed on the adhesive sheet. A pavement method for roads, characterized in that the asphalt mixed material is applied.