JPH09328708A - Road heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a heating unit from being moved due to the deformation of a road surface, prevent an accident due to the external force applied to the heating unit, and improve the efficiency of construction work. SOLUTION: A road heater is so constructed that a heating unit 1 is passed through many steel pipe 2 arranged side by side at designated spaces in the ground of an asphalt pavement road to melt snow on the road surface by heat of the heating unit 1. In this case, plural holding parts 5 for holding the steel pipes 2 are formed at designated spaces on a fixing member 3 for fixing the steel pipes 2 in the ground, plural anchors 4 are projected thereon in such a manner as to project downward, and the lower parts of the anchors 4 are bent at right angles in different directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road heater which is buried in a road to prevent snow melting on the road surface and freezing on the road surface.

[0002]

2. Description of the Related Art In a conventional snow-melting road, a heating wire in which a metal resistance wire is covered with a synthetic resin material is directly buried on a foundation roadbed of the road.

[0003]

However, in the above-mentioned snow-melting road, the asphalt pavement part is loosened by the heat of the sun in midsummer and becomes a soft road surface. Even if there is a movement phenomenon in the road surface layer due to rustling or waviness, the embedded heating wire is broken, there is an accident that causes insulation failure and snow melting failure, or there is no failure in the heating wire , The interval of the heating wire to be buried is preset from the calorific value calculation at the time of construction, but with the change of the road surface, the interval may change, and it may not be possible to melt snow evenly, and it is thawed when the road surface freezes. There were some places that were not closed and there was a risk of an accident.

The present invention solves the above problems, prevents the heating element from moving due to deformation of the road surface, prevents accidents due to external force applied to the heating element, and improves the efficiency of construction work. It is an object to provide a load heater that can be used.

[0005]

In order to solve the above-mentioned problems, a road heater according to the present invention has a structure in which a heating element is passed through a large number of steel pipes arranged in parallel in the ground of an asphalt paved road at predetermined intervals. A road heater that melts snow on the road surface with the heat of the body and has the following requirements. (A) A fixing member for fixing the steel pipe to the ground is provided. (B) A plurality of holding portions for holding the steel pipe are formed at predetermined intervals on the fixing member, and a plurality of anchors are projected downward. (C) The lower part of the anchor is bent at a right angle in different directions.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a load heater according to the present invention. The load heater generates heat when energized, a steel pipe 2 passing through the heat generator 1, and this steel pipe 2.
And a fixing member 3 for fixing.

The heating element 1 may be, for example, KEM-1 or KEM-2 of Kaken Co., Ltd., which employs a self-temperature control method. As shown in FIG. 2, this heating element 1 has two conductors (strands of copper) 6 and a heating resistor 7 made of a mixture of a radiation-crosslinking polymer and conductive carbon to continuously form a parallel circuit. Insulation coating 8 made of resin, tin-plated copper braid 9 and exterior insulation coating 10 made of polyolefin are applied. The resistance is increased or decreased by changing the coupling density, and the heat output can be controlled so as to maintain a constant temperature.

As shown in FIG. 1, the heating element 1 is arranged so as to penetrate through a galvanized steel pipe 2,
When used at 0V, the maximum temperature of the heating element is set to 70 to 75 degrees.

By the way, as shown in FIG. 3, the steel pipes 2 are fixed on the foundation roadbed a by fixing members 3 near both ends, and a large number of the steel pipes 2 are arranged side by side at predetermined intervals so that both ends reach the road shoulders b. After that, its upper part is covered with asphalt pavement.

The fixing member 3 is a galvanized steel plate having a long plate shape, and as shown in FIG. 1, a holding portion 5 consisting of an inverted U-shaped notch for fitting the steel pipe 2 is predetermined. The anchors 4, which are formed at intervals and which are formed by bending galvanized round steel into a substantially L shape, are welded and fixed so as to project downward.

The lower portion of the anchor 4 is bent at a right angle, and the bent portions 4a are welded and fixed to the fixing member 3 so as to face different directions, and the fixing member 3 is embedded in the foundation roadbed. When gripping the foundation roadbed, the front and rear due to deformation of the asphalt road surface,
It is formed so that the embedded position of the fixing member (steel pipe) does not change due to external pressure in the left-right and up-down directions.

The load heater of the present invention has an outer diameter of 27.
Using a 5 mm steel pipe 2, a 500 mm long fixing member 3
The holding portions 5 are formed at 100 mm intervals, the anchor 4 having a length of about 350 mm is bent at a right angle at a position of about 50 mm from the lower end, and the upper portion is fixed to the fixing member 3 by welding.

The distance between the holding portions 5 is not limited to 100 mm, and may be 50 mm or 150 mm. Further, the length of the fixing member 3 is not limited to 500 mm and may be 1 meter. Moreover, the number of anchors 4 is not limited to three, and may be increased or decreased according to the length of the fixing member 3.

As shown in FIG. 4, the load heater having the above-mentioned structure fixes the steel pipe 2 on the foundation roadbed a with the fixing member 3, and then paves it from above with the asphalt material c and projects it on the road shoulder surfaces b on both sides of the road. The long heating element 1 is inserted from the opening of the steel pipe 2 connected to the U-shaped connecting pipe 11 in a meandering manner so as to be sequentially fed into the pipe. After accommodating the heating element 1, the openings at both ends are sealed by the sealing cap 12 and the withdrawing cap 13 to be waterproofed and electrically insulated (see FIG. 5).

In the road heater buried in the road, the anchor 4 provided on the fixing member 3 for fixing the steel pipe 2 spreads its tip into the foundation roadbed in different directions so that the root of the tree can be stretched. As it is gripped, the asphalt loosens due to the heat of the summer heat, and the weight of the vehicle and the deformation of the road surface caused by the sudden start and stop of the vehicle cause the steel pipe 2
The steel pipe 2 does not move even if an external force for moving the steel pipe 2 is applied from any of the front-back, left-right and up-down directions.

Further, since the holding member 5 for holding the steel pipe 2 is formed on the fixing member 3 at a predetermined interval in advance, if the steel pipe 2 is laid along with the holding member 5, the holding member 5 is laid at an accurate interval. In addition, a large number of steel pipes 2 can be laid in a short time, which can contribute to the improvement of work efficiency of road heater construction work.

Since the electric heating element 1 uses an electric heating element of a self-temperature control system which always keeps a constant temperature by simply energizing it, it is not necessary to prepare a temperature control device specially, and it is possible to use it after burying. It is possible to provide a load heater that is excellent in terms of operation and management in addition to maintenance and management of the load heater.

Further, as shown in FIG. 6, a through hole 15 or a notch 16 may be formed in the fixing member 3 above the holding portion 5. As shown in FIG. 7, the steel pipe 2 is attached to the holding portion 5.
After holding the steel pipe 2 and the fixing member 3 with a wire 17 such as a stainless wire or a wire, the through hole 15 or the notch 1
The steel pipe 2 can be reliably fixed to the fixing member 3 by tying it via 6, and the movement of the steel pipe due to the deformation of the road can be reliably prevented. In addition, both the through hole and the notch may be formed in one fixing member, or either one of them may be formed.

[0020]

According to the load heater of the present invention, since the fixing member for fixing the steel pipe having the heating element therein holds the foundation roadbed by the anchor, the asphalt road surface is softened by solar heat. Therefore, even if an external force is applied to the steel pipe, the steel pipe does not move, and it is possible to prevent the accident that becomes unusable due to the disconnection of the heating element or the insulation failure due to the movement of the steel pipe. It is possible to provide a road heater effective for maintenance of a snow melting road.

Further, since the holding member is formed on the fixing member at predetermined intervals to hold the steel pipes, if the steel pipes are laid while being held by the holding parts, the steel pipes can be laid at precise intervals in a short time. Therefore, it is possible to contribute to improving the work efficiency of the construction work.

[Brief description of drawings]

FIG. 1 is a perspective view of a road heater according to the present invention.

FIG. 2 is a perspective view showing the configuration of a heating element.

FIG. 3 is a plan view illustrating installation of a road heater.

FIG. 4 is a cross-sectional view of a road illustrating a buried state of the road heater.

FIG. 5 is a plan view illustrating installation of a road heater.

FIG. 6 is a front view showing another example of a load heater.

FIG. 7 is a perspective view of a load heater of another example described above.

[Explanation of symbols]

 1 Heating element 2 Steel pipe 3 Fixing member 4 Anchor 5 Holding part

Claims (1)

[Claims] 1. A road heater which passes a heating element through a large number of steel pipes arranged side by side at predetermined intervals in the ground of an asphalt pavement and melts snow on the road surface by the heat of the heating element, and has the following requirements. Road heater characterized by the fact. (A) A fixing member for fixing the steel pipe to the ground is provided. (B) A plurality of holding portions for holding the steel pipe are formed at predetermined intervals on the fixing member, and a plurality of anchors are projected downward. (C) The lower part of the anchor is bent at a right angle in different directions.