JP3044340B2 - Road surface heating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road surface heating method for heating a pavement such as a road to prevent snow and freezing on the road.

[0002]

2. Description of the Related Art In an area where the temperature is low and snowfall is expected, a road surface heating device is installed for heating the road surface of an asphalt pavement such as a road to prevent snow and freezing.

As shown in FIG. 6, the road surface heating device is provided with a heating wire such as a nichrome wire or the like embedded in the asphalt pavement 1 while maintaining a required interval and meandering over the entire width of the asphalt pavement 1. 2 is connected to a power supply (not shown) of a power generation facility or the like. In this configuration, when the heating wire 2 is heated to 20 ° C. to 30 ° C. and the road surface temperature is to be maintained at 4 ° C. to 5 ° C., the heating wire having a total length of 10 m per 1 m ^{2 of the} road surface 1 ′ is used. It needs to be buried.

[0004]

However, in the prior art, the heating wire 2 is laid while meandering over the entire width of the asphalt pavement 1 so as to prevent snow on the entire surface 1 'of the asphalt pavement 1. Therefore, if the width of the pavement road 1 is 10 m, the total length of the heating wire 2 that must be buried per 100 m of unit path length is 100 m.
00m had been reached.

[0005] In other words, the heating wire 2 is buried on the road surface near the curb 1 ", 1" through which cars and the like do not pass, so that the total length of the heating wire 2 buried per unit length of the asphalt pavement 1 is reduced. It was extremely long. Therefore, the material cost of the heating wire 2 increases, and the heating wire 2
Burying while meandering is complicated and time-consuming,
The burial cost is extremely high. Also,
As the total length of the heating wire increases, the power consumption increases accordingly, and it is necessary to install a power supply such as a power generation facility or a substation facility with a large capacity corresponding to the power supply.

Further, in existing bridges and the like, since the strength is designed based on a preset load, even when the heating wire 2 needs to be laid on the bridge, the heating wire 2 or the heating wire 2 is used. Cannot withstand the load of covering asphalt layer, etc.
It may not be possible to lay it. In addition, in the case of repairing the bridge or the like in order to lay the heating wire, the cost is further increased and the work of burying the heating wire is prolonged.

Accordingly, the present invention provides a method for heating a road surface capable of greatly reducing the amount of use and cost of a heat-generating cord, performing burying work easily and in a short period of time, and suppressing power consumption. What you want to do.

[0008]

The method for heating a road surface according to the present invention comprises a heat-resistant vinyl material, which is formed by arranging aramid fibers and metal fibers such as metal fibers in a circular cross section around the heating element 6 from the inside to the outside. And the like, a protective coating 8 made of the same material as this, and a protective coating 9 woven with heat-resistant fiber are sequentially laminated to form a heating cable A, which is used for tires of automobiles and the like on paved roads such as roadways. It is embedded in a traffic zone 5 which is a locus of rolling contact with a road surface in a straight line along the traffic zone 5, and the traffic zone 5 is heated by the heating wire A.

The heating cord A has a conductor resistance of 1.7 Ω / m, an insulation resistance of 600 MΩ / Km and a withstand voltage of 1 Ω / Km.
The heat generation temperature can be set in the range of 500 V / min and substantially in the range of 0 ° C. to 300 ° C., and it is preferable to lay three of these in one traffic band.

[0010]

Embodiments of the present invention will be described with reference to the drawings. The road surface heating device used for carrying out the road surface heating method of the present invention includes a plurality of heat-generating cords A buried in the asphalt pavement road 3 and shown in FIGS.
A power supply (not shown) is connected.

The asphalt pavement 3 has a width w of 10 m, which is the same as that of the above-described pavement 1, and is a two-lane road having lanes 3a, 3a formed on both sides of the center line 4.

In each lane 3a, a straight line 3 is formed in each of the traffic bands 5...
The heating strips of the book are kept at a required distance from each other and are also parallel to the road surface 3 '.
It is laid along.

The traffic zone 5 is a locus of a tire such as an automobile rolling on the road surface 3 '. FIGS. 1 and 2 show an example in which a linear heating cable A is laid along each locus. ing. In addition, 3 "and 3" are curbs formed on both sides of the road surface 3 '.

The heating cord A is a heating cable having an outer diameter of about 9 mm. The heating cord A is formed around the heating element 6 formed by arranging an aramid fiber and a metal fiber such as a metal fiber in a circular cross section from the inside to the outside. , An insulating coating 7 such as heat-resistant vinyl, a protective coating 8 made of the same material as this, and a protective coating 9 woven with heat-resistant fibers are sequentially laminated (FIGS. 3 and 4).

The specific characteristics of the heating cord A are as follows.
For example, a conductor resistance value of 1.7Ω / m and an insulation resistance value of 600M
Ω / Km, withstand voltage 1500 V / min.
The heat generation temperature can be set in the range of ° C to 300 ° C.

The heating cord A is maintained at 20.degree.
Generate heat to 30 ° C and reduce the road surface temperature of traffic zone 5 to 4 °
Assuming that the temperature is maintained at C to 5 ° C., three heating cords A may be used per one traffic band 5. In this case, six lanes are used per lane, and twelve lanes are used. Therefore, the total length is 1 per unit length of 100 m.
A 200 m exothermic cord A is used. When two heating cords A are allocated to the center line 4 and used, the total length is 1600 m.

Further, since the heating cord A can be set at a higher heat generation temperature as compared with a conventional nichrome wire or the like, when the heat generation temperature is set to 20 ° C. to 30 ° C. or more, (1) The number of heating cords A per one traffic zone 5 can be reduced, and the total length of the necessary heating cords can be further reduced.

The asphalt pavement using the heating cord A is constructed as follows. Laying crushed stones, sand, etc. on the ground, leveling and leveling, casting asphalt to create a roadbed, and then lay a wire mesh for fixing formed by vertical and horizontal streaks. Next, assuming a trajectory in which the tire of the car rolls on the road surface 3 ', the heating cords A are laid in a straight line along this trajectory, and they are tied vertically by a binding wire mesh or the like. Tighten and fix to muscles and transverse muscles as appropriate.

Then, a heated asphalt is cast to form an asphalt surface layer having a thickness of, for example, about 100 mm in which the heating cord A is buried, and the asphalt surface layer is pressed by a required roller. As a result, the desired asphalt pavement is obtained.

The present invention is not limited to the above-described embodiment, but can be modified as follows. As the heating wire, in addition to the above-described heating wire that is electrically heated, a wire having a configuration in which a heat transfer medium such as hot water flows through a cross-linked polyethylene pipe may be used.

[0021]

According to the road surface heating method of the present invention, the following effects can be obtained. As a heating cord, around the heating element woven with aramid fiber and metal fiber such as metal fiber in a circular cross section, from inside to outside,
Insulation coatings such as heat-resistant vinyl, a protective coating made of the same material as this, a protective coating woven with heat-resistant fibers, etc. are sequentially laminated, so compared to conventional nichrome wires, etc. Vibration resistance and load resistance can be improved. Therefore, it is effective in preventing disconnection due to vibration and the like,
For example, it is suitable for laying on a bridge or the like where vibration is likely to occur due to traffic of an automobile or the like.

Since a linear heating line is laid in a traffic band, which is a locus of a tire such as an automobile rolling on a pavement road such as a roadway, the area of the road surface to be heated is provided. Therefore, the total length of the heating cord required for heating can be extremely shortened, and the laying operation can be easily performed in a short time.

Since the entire length of the heating cord can be extremely shortened, the weight per unit length of the pavement can be significantly reduced. Therefore, it can be easily installed on an existing bridge or the like without considering its strength and the like.

Since the entire length of the heating cord can be made extremely short, a generator, a windmill, a solar cell and the like can be used alone or as a power source combining them, and the power source can be easily secured and the power can be easily obtained. Supply can be performed at low cost. In addition, since it is possible to use a small power supply equipment, it is possible to easily install the power supply in a place where it is difficult to secure a power supply, such as a mountain area.

According to the second aspect of the present invention, in addition to the above-mentioned common effects obtained by the first and second aspects of the present invention, the heating cord is heated to, for example, 20 to 30 ° C. which is the same as the conventional one. In the case where the road surface temperature of the traffic zone is maintained at 4 ° C. to 5 ° C., a heating cable of 10,000 m per unit path length of 100 m is conventionally required.
Only 1200 m of heating cords per unit path length of 0 m may be used. That is, the length of the heating cord used can be reduced to about one-eighth of the conventional length.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view of a state in which a heating cord is laid only in a traffic zone on a road surface.

FIG. 2 is a perspective plan view thereof.

FIG. 3 is a perspective view of a heating cord.

FIG. 4 is a sectional view of the same.

FIG. 5 is a perspective plan view showing a state in which a conventional heating wire is laid in a meandering manner over the entire width of a pavement.

[Explanation of symbols]

 3 Paved Road 3 'Road Surface 5 Traffic Band 6 Heating Element 7 Insulating Film 8 Protective Film 9 Protective Film A Heating Cable

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E01C 11/26 E04H 9/16 H05B 3/56

Claims (2)

(57) [Claims] 1. An insulating coating made of heat-resistant vinyl or the like, or a protective coating made of the same material, from the inside to the outside around a heating element made by arranging aramid fibers and metal fibers such as metal fibers in a circular cross section. The heating cord formed by sequentially laminating protective coatings woven with heat-resistant fibers is used to form a straight line along a traffic zone where a tire of an automobile or the like is in contact with a road surface of a pavement road such as a roadway. A road surface heating method, wherein the road surface is buried and its traffic zone is heated by the heating cord. 2. The heating cord has a conductor resistance of 1.7Ω /.
m, insulation resistance 600 MΩ / Km, withstand voltage 1500 V /
The road surface heating method according to claim 1, wherein the heat generation temperature can be set within a range of approximately 0 ° C to 300 ° C, and three of them are laid in one traffic zone.