JPH116106A - Snow-melting pavement construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain uniformity in snow removal by far-infrared light by mixing straight asphalt into lump or powder carbon, forming an intermediate layer by spreading the mixture on a binder course, and arranging electrodes on the intermediate layer. SOLUTION: A flexible binder course 3 that is compacted with crushed stone or gravel sand is formed on a ground surface 1. An intermediate layer 5 where carbon is compacted as a heating element due to application of power, is spread thereon. A surface layer 7 is constructed thereon by normal asphalt pavement. To apply power, power application lines 9, 11 as two electrodes are arranged in the intermediate layer 5 in parallel. Branch lines 13, 15 extending to the other side are connected to the two power application lines 9, 11 and are intertwined therewith alternately. When there is a snowfall, if the power is turned on, paved portions are warmed to an averaged temperature overall, removing snow uniformly. Therefore, snow melting is averaged, showing a satisfactory snow melting effect, and snow melting is performed conveniently and conductive to energy saving and improved workability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting pavement method for erasing snow on roads, sidewalks, gardens, etc. by heat generated by electricity.

[0002]

2. Description of the Related Art Conventionally, snow melting devices on roads, gardens, etc.
Water spraying, burying of a heating tube through which a heat medium such as hot water passes, and burying of a heating element by energization are employed. In this case, as the heating element, a plate-shaped heating element (JP-A-62-291883), a linear heating element (JP-A-7-331605), or the like is used.

[0003] As the linear heating element, a nichrome wire or a bundle of carbon fibers coated with an insulating material is used. In the construction, after wiring on a base layer such as a crusher run, pavement is applied on the surface, etc., but it is difficult to accurately and stably install the linear heating element. However, as shown in the above-mentioned publication, a magnet for attracting is attached to the linear heating element, but the work is complicated and the work efficiency is poor. There was a problem that it becomes expensive.

In addition, since heat is radiated at the locations where the linear heating elements are arranged, uniformity of snow removal cannot be obtained, and electric energy is greatly lost. Further, in the case of a bundle of carbon fibers, far-infrared rays promote snow removal, but since this is also partial, there is a problem that the effect of far-infrared rays cannot be expected much.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention not only provides uniformity in snow removal by far-infrared rays, improves snow removal efficiency, but also improves workability in construction. The purpose of the present invention is to provide a snow melting pavement method that is inexpensive in terms of material.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an upper roadbed (crusher run C-4).
0, on the base layer constructed on the crushed stone M-40)
In the snow melting pavement method of forming an intermediate layer that generates heat by energization and forming a surface layer on it,
After mixing the asphalt of which the kinematic viscosity is increased by heating as a linking material into the lump or granular carbon, the main carbon material is adjusted, and it is spread over the base layer. The present invention provides a snow-melting pavement method characterized in that the intermediate layer is constructed in two stages, upper and lower, and electrodes are provided between the two layers.

[0007] According to the above construction, the intermediate layer is evenly embedded in the construction area, and since it is a mass of carbon radiated by far-infrared rays, snow can be uniformly and efficiently eliminated. In addition, the arrangement of the conducting wire is easy, no holding tool is required, the construction is not much different from ordinary pavement, machine construction by a roller fisher or the like is possible, and work efficiency is good. Furthermore, since straight asphalt was used as a connecting material for the intermediate layer, powdered and granular carbon (particle diameter: 3 to 0.3) obtained by steaming and grinding waste such as paper and wood was used as carbon.
mm). Therefore, the construction is inexpensive in terms of material.

[0008] Further, when the conducting wires provided as electrodes in the intermediate layer are formed in parallel, and the conducting wires are connected in advance so that the branch wires are interleaved in advance, not only the wiring becomes stable, but also the conductivity is improved. The properties are improved, and cracks in the intermediate layer are prevented.

[0009] To ensure conductivity, it is necessary that carbon is in contact, and this is done by making carbon 90% or more. If the amount of the straight asphalt as the connecting material is less than 6%, its function is insufficient, and if it exceeds 10%, it hardly hardens, which causes trouble in machine construction. Note that this ratio is a relationship between carbon and straight asphalt, and is intended to facilitate construction and to provide necessary strength (Marshall stability test 500 kg · F
In order to obtain the above, solid materials such as crushed stone and sand may be mixed in a range that does not hinder conductivity.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As massive or powdery carbon, charcoal and coal are suitable for use because they are inexpensive.
In particular, carbon obtained by steaming wastes such as wood chips and old magazines is suitable for environmental protection measures that are friendly to the earth under the current situation where it is difficult to recycle these recycled papers. In addition, carbon black obtained by treating petroleum products at a high temperature of about 1100 ° C. is suitable for use because of its stable conductivity, but it is costly, and therefore it is auxiliary even when used. desirable.

There are two types of asphalt, one calculated naturally and one obtained as a distillation residue in the refining of petroleum. The former is called natural asphalt and the latter is called petroleum asphalt (straight asphalt). The components of asphalt are divided into an oily portion (petrolene) that is soluble in petroleum ether and a solid portion that is not soluble (asphalten). Straight asphalt has a high content of petrolene and is highly sticky.

Since the connecting material is straight asphalt even if the carbon is powder, the connecting function is sufficiently exhibited by its kinematic viscosity. As for the temperature at which the kinematic viscosity is imparted, the mixing temperature is set to 1 as in the case of ordinary asphalt pavement.
The temperature may be about 37 to 153 ° C., but may be about 180 ° C., for example, in order to increase the degree of mixing. However, when compacting, the temperature is set to about 137 to 141 ° C., as in the case of ordinary asphalt pavement.

When pressed, the connecting material hardens and shrinks, and the carbon powder comes into contact, thereby obtaining conductivity. If the degree of pressurization is small, conductivity cannot be obtained. Ensuring conductivity is affected by the type and properties of the carbon powder, the degree of pressurization, and the like. When carbon fibers are mixed, strength and conductivity are improved.

[0014] Even if a conductive filler is mixed in an auxiliary manner in order to enhance the conductivity, it is not against the gist of the present invention. As the conductive filler, metal powders such as copper and nickel, powders of metal oxides such as zinc oxide, indium oxide and tin oxide, carbon black and graphite can be used.

In the middle layer 5, the branch lines 13, 15 of the current-carrying wires 9, 11 are inserted in a wrong manner, so to speak, they are hardened, so that the strength is also improved, and the middle layer 5 is temporarily cracked. Also, conductivity is ensured. Any material may be used for these wires as long as they have conductivity, but copper wires are most suitable.

[0016]

As described above, according to the snow melting pavement method of the present invention, the construction area is uniformly heated, and the middle layer is a mass of carbon, and the effect of far infrared rays is also uniform. As a result, snow removal is averaged and the snow removal efficiency is good, and not only can snow removal be performed conveniently, but it is also suitable for energy saving, workability is good, and straight asphalt is used as the connecting material. Therefore, carbon made of waste material can be used for carbon, and there is an excellent effect that construction can be performed easily and at low cost.

[0017]

FIG. 1 is a sectional view of a pavement embodying the present invention, and FIG. 2 is a wiring diagram of electrodes. Cross section, ground 1
A flexible base layer 3 compacted with crushed stone or gravel is formed thereon, and an intermediate layer 5 as a heating element by compaction of carbon is formed thereon, and a normal asphalt pavement is formed thereon. The surface layer 7 is applied. In order to conduct electricity, the conducting wires 9 and 11 as both electrodes are arranged in parallel in the intermediate layer 5, and the conducting wires 9 and 11 are connected to branch lines 13 and 15 extending to the other side. Branch lines 13 and 15 are alternately formed.

As the carbon for the material of the intermediate layer 5, paper or wood made of steamed charcoal was used almost equally. Since the original form remains as it is, it was pulverized by a mixer and the cut powder was used as a raw material. In the field, it is kneaded with straight asphalt at a ratio of 9: 1, in this case 150
Straight asphalt heated to about ° C was used.
The characteristics of the chips are as follows.

[0019]

In the construction of the intermediate layer 5, first, the half layer is leveled. Next, the conducting wires 9 and 11 with the branch lines 13 and 15 are arranged at predetermined positions thereon, and a thermostat is partially provided. Then, the thermostat is lightly pressed from above to temporarily fix the wires. Further, the remaining conditioning material was discharged from the mixer and leveled, and then pressed with a roller fisher.

The thickness of the base layer 3 is about 60 m.
m, the intermediate layer 5 was about 20 mm, and the surface layer 7 was about 20 mm. Note that an insulating sheet such as rubber may be interposed between the base layer 3 and the intermediate layer 5.

Regarding the construction cost, in the case of watering, the cost is 20,000 yen / m ² ,
The price was significantly lower, from 0 to 8,000 yen / m ² . Also,
When the power was turned on during the snowfall, the temperature of the pavement was raised to an average temperature over the entire area, so that the snow was evenly removed and the snow was efficiently removed by the influence of far-infrared rays.
The temperature of the intermediate layer 5 was set at 20 ° C., and a low voltage was passed through the electric wires 9 and 11 to maintain this value.

[Brief description of the drawings]

FIG. 1 is a perspective sectional view of a pavement embodying the present invention.

FIG. 2 is a wiring diagram of electrodes.

[Explanation of symbols]

 Reference Signs List 3 Base layer 5 Intermediate layer 7 Surface layer 9, 11 Conducting wire as electrode 13, 15 Branch line 21 Connecting material

Claims (3)

[Claims] 1. An intermediate layer, which generates heat when energized, is formed on a base layer constructed on an upper subgrade in road pavement work,
In the snow-melting pavement method of forming a surface layer on it, for the formation of the intermediate layer, mixed asphalt with kinematic viscosity increased by heating as a linking material is mixed with massive or granular carbon to produce a heated asphalt mixture. After the carbon adjusted in this way spreads the main carbon material on the base layer, it is pressurized from above to form a carbon mass, and the intermediate layer is constructed in two stages, and the electrodes are disposed therebetween. A snow melting pavement method. 2. The conductive wire according to claim 1, wherein the conductive wires provided as electrodes in the intermediate layer are parallel to each other, and the conductive wires are connected so that branch wires are alternately interleaved in advance. Snow melting pavement method. 3. The snow melting pavement according to claim 1, wherein in the adjustment of carbon and straight asphalt in the intermediate layer, carbon is 90% or more and straight asphalt as a connecting material is 6 to 10%. Construction method.