JP2993596B2 - Road surface heating device for snow melting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates generally to snow melting road heating devices and, more particularly, to an improved snow melting road heating device having low installation and maintenance costs.

[0002]

In a snow-covered area, how to treat the snow that has accumulated is an important problem. As one of devices for treating snow that has accumulated on a road surface, there is a road surface heating device or a road heating device that melts snow on the road surface in place. Road surface heating devices are usually installed below the road surface and installed to melt snow that has fallen at entrances, sidewalks, parking lots, etc. of buildings. Various types of road surface heating devices are known, such as a type in which a hot water pipe is embedded, a type in which an electric heating cable is embedded, and a type in which an infrared lamp is installed on a road. However, these road heating devices have the disadvantage that they are very expensive to install and maintain. Accordingly, there is a strong need for a road surface heating device that is less expensive to install and maintain.

[0003]

According to the present invention, there is provided, in accordance with the present invention, a casing, a tube mounted through the casing and through which a heating fluid is passed, and a casing filled therein. A snow melting road surface heating device is provided, comprising a stone and a liquid filled in a gap between the stones. In one preferred aspect, the liquid is an oil. In another preferred aspect, the liquid is an antifreeze. In yet another preferred aspect, the tube is:
It is covered by a mantle tube having a larger diameter than this tube, the mantle tube being provided with holes. Further, in another preferred aspect, the heating fluid is hot water.

[0004]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. The snow-melting road surface heating device of the present invention, generally indicated by reference numeral 10 in FIGS. 1 and 2, has a box-shaped casing 12 made of steel. The casing 12 includes an upper plate 12a, two facing longitudinal side plates 12b, two facing transverse side plates 12c, and a bottom plate 12d. Preferably, the longitudinal side plate 12b, the transverse side plate 1
2c, the corresponding side edges of the bottom plate 12d are welded together at the factory to form a box, and as described in detail below, after the device 10 is installed below the road surface, the upper plate 12a is placed on the box. Weld.

[0005] The snow melting road surface heating device 10 is also provided along the longitudinal axis of the casing 12 (ie, the casing 1).
It has a first tube 14 and a second tube 16 extending through the casing 12 (parallel to the two longitudinal side plates 12b) and through which the heating fluid is passed. One end 14a of the first tube 14 and one end 16a of the second tube 16 are connected to a boiler (not shown) for supplying a heating fluid such as hot water or steam to the tubes. , The other end 14b, 1
6b is connected in fluid communication by a bend tube 18. As a result, the heating fluid supplied from the boiler passes through the first pipe 14 and passes through the second pipe 18 through the curved pipe 18.
And returned to the boiler through the pipe 16. As shown in FIG. 1, the first pipe 14 and the second pipe 16 are connected to the transverse side plate 12 c of the casing 12.
Through the side wall 12 at the point of penetration.
c.

On the other hand, inside the casing 12, a stone 20
And the gap between the stones is filled with oil 22. Thereby, when the heating fluid is supplied from the boiler to the tube, the casing 12
The oil 22 and the stone 20 inside are heated. In addition, the stone 20 filled in the casing 12 is such that if a gap in which the oil 22 is filled in the casing 12 is obtained,
It may be gravel or crushed stone. Further, as the oil 22, it is preferable to use waste oil from the viewpoint of cost reduction and resource saving.

The upper plate 12a of the casing 12 has
An oil supply port 24 for supplying oil 22 to the device 10 is provided. Preferably, as shown in FIG. 2, an oil expansion adjusting chamber 26 is provided adjacent to the oil supply port 24 to allow the heated and expanded oil 22 to escape from the device 10.
The oil expansion adjustment chamber 26 is covered with a cap 28.

The use of the snow melting road surface heating apparatus 10 of the present invention configured as described above will be described with reference to FIG. When burying the device 10, first, a place where the device 10 is to be buried is excavated to a predetermined depth, and
Lay 2 and squeeze enough. Next, a heat insulating material 34 such as a stylohome is laid to prevent heat radiation to the roadbed. Next, as described above, the casing 12 to which the upper plate 12a is not mounted is arranged, and the casing 12 is filled with the stone 20. Thereafter, the upper plate 12 is welded.
a is attached to the casing 12. Next, the oil 22 is injected into the casing 12 from the oil supply port 24 shown in FIG. In order to spread the heat to the side of the device 10, the periphery of the device 10 is buried with a crushed stone or a material 36 having good heat conductivity, and the device 1 is covered with an asphalt layer 38.
Cover 0. The device 10 is preferably embedded so that the upper end of the cap 28 is located substantially on the upper surface of the asphalt layer 38.

When the heating fluid supplied from the boiler is passed through the first pipe 14 of the buried apparatus 10 as described above, heat is transferred to the oil 22 through the pipe wall of the first pipe, and The temperature of 22 rises. Then, the stone 20 is heated by the heated oil 22. Once heated, the stones 20 are hard to cool down and serve as a kind of heat storage material, which makes it possible to melt the snow that has accumulated on the asphalt layer 38 for a long time. The heating fluid passing through the first pipe 14 is bent by the bent pipe 1
It is returned to the second tube 16 via 8 and is again transferred to the oil 22 and the stones 20 through the tube wall of the second tube and then to the boiler. Note that the stone 20 serves as a heat storage material as described above, and also serves as a cushioning material for reducing a load such as a vehicle weight applied to the device 10.

Next, with reference to FIG. 4, an experiment conducted to verify the effect of the apparatus of the present invention will be described. The experiment was carried out on an 8 m wide road with a 400 mm wide device 10 of the present invention.
4 was carried out as shown in FIG. 4 (that is, the first device 10 was set up 600 mm from the curb at the road edge,
The second device 10 is set at 1400 mm from the first device 10.
installed). Hot water circulation pump (0.8kW, 1300r
pm), hot water at 70 ° C. was supplied for 0.5 hour, and then the cycle of stopping the supply for 1 hour was repeated 16 times (ie, 24 hours), and the snow melting width W was measured.
In Experiment 1, the amount of snowfall was 2-3 cm (air temperature was + 1 ° C-
In the case of -4 ° C), in Experiment 2, when the amount of snowfall was 1 to 3 cm (the temperature was + 8 ° C to -6 ° C), in Experiment 3, the amount of snowfall was 3
Experiment 4 in case of 5 cm (air temperature is -7 ° C. to -9 ° C.)
Means that the snowfall is 10-15cm (the temperature is -10 ° C ~ -12
In the case of Experiment 5, in Experiment 5, when there was no snowfall for 3 days (the temperature was −1 ° C. to −3 ° C.), in Experiment 6, the amount of snowfall was 4
This is the case of about 0 cm (air temperature is + 16 ° C. to −12 ° C.). From this result, it was found that even if the amount of snowfall was about 15 cm, it was possible to melt the snow almost completely by installing the apparatus of the present invention at a distance of about 1400 mm.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims. It goes without saying that it is included in.

For example, in the above embodiment, the first pipe 14 and the second pipe 16 are in direct contact with the stone 20 filled in the casing 12, but as shown in FIG. The first tube 14 and the second tube 16 may be covered with a mantle tube 40. That is, in the embodiment shown in FIG. 5, the first tube 14 and the second tube 16 are each covered by an outer tube 40 having a larger diameter so as to form a space 42 therebetween. The outer tube 40 is provided with a hole 44. Thus, first, the oil 22 existing in the space 42
Is rapidly heated by the heat of the heating fluid passing through the tubes 14, 16, so that the heated oil 22 flows out of the hole 44 into the gap of the stone 20 while the oil 22
Flows into the space 42 through the hole 44, and the stone is heated more efficiently than in the embodiment without the mantle tube 40.

In the above-described embodiment, the casing is formed by welding a steel plate. However, in order to reduce the manufacturing cost of the apparatus, the casing is formed by using an existing square pipe. It may be formed. In the above embodiment, the first tube 14 and the second tube 26
Although two tubes are used, one tube may be used, or three or more tubes may be used. Further, in the above embodiment, the gap between the stones 20 is filled with the oil 22, but antifreeze or water may be used instead of the oil. Also, a flexible joint 46 may be provided between the first tube 14 and the second tube 16 and the boiler to absorb the thermal expansion of the tubes, as shown in FIG. Further, in the above-described embodiment, only one device 10 is shown in the length direction of the casing 12, but a plurality of devices 10 may be connected in the length direction. In this case, the tube 14 of the device 10 located farthest from the boiler,
Only the ends 14 b, 14 b of the sixteen are connected by the bent pipe 18.

[0014]

According to the present invention, since the stone serving as a heat storage material is filled in the casing of the apparatus, the maintenance cost can be greatly reduced, and the stone itself is inexpensive. Cost reduction has also become possible. Further, as is clear from the above experimental results, the device of the present invention is not only directly above the device, but also on the side of the device.
Since the heat can be effectively transferred, it is not necessary to install the device over the entire area to be melted. Further, if waste oil is used as the liquid to be filled in the gap between the stones, the cost can be further reduced, which is advantageous from the viewpoint of resource saving. Further, filling the gaps between the stones with oil also helps to prevent rust on the inner wall of the housing.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a snow melting road surface heating device according to the present invention.

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.

FIG. 3 is a schematic view showing a state where the snow melting road surface heating device shown in FIG. 1 is buried under a road surface.

FIG. 4 is a diagram showing the state of an experiment performed to verify the effect of the apparatus of the present invention and the results of the experiment.

FIG. 5 is a cross-sectional view showing another embodiment of the snow melting road surface heating device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Road surface heating device for snow melting 12 Casing 14 1st tube 16 2nd tube 20 Stone 22 Oil 40 Mantle tube

Claims (5)

(57) [Claims] 1. A snow-melting road surface heating device for melting snow on a road surface, comprising a casing, a pipe mounted through the casing and through which a heating fluid is passed, and filled in the casing. An apparatus comprising a stone and a liquid filling a gap between the stones. 2. The apparatus according to claim 1, wherein said liquid is oil. 3. The apparatus according to claim 1, wherein said liquid is an antifreeze. 4. The tube according to claim 1, wherein the tube is covered by a mantle tube having a larger diameter than the tube, and the mantle tube is provided with a hole. The apparatus according to claim 1. 5. The apparatus according to claim 1, wherein the heating fluid is hot water.