JPH0827714A - Snow melting device of heat radiation pipe with upper fins - Google Patents

Abstract

PURPOSE:To melt snow, snow and ice, and frozen water on a road surface rapidly and efficiently, and also reduce running cost. CONSTITUTION:A heat radiation pipe 2c with upper fins provided with fins on its upper part is set in the inside of a road bed surface layer 3. Also a heat insulating material 4 is installed under the heat radiation pipe 2c with upper fins. Heat fluid is passed through the inside of the heat radiation pipe 2c with upper fins to heat the temperature of the road bed surface layer 3 and to melt the snow, snow and ice, and frozen water on a road surface 1. The heat radiation pipe 2c with upper fins should desirably be arranged zigzag in a precast concrete panel formed in a specified size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to roads in cold regions,
The present invention relates to a fin-equipped radiating pipe snow melting device used to melt snow on a road surface such as a sidewalk and prevent water from freezing on the road surface.

[0002]

2. Description of the Related Art It is important to protect transportation facilities in winter from snow damage in snowy and cold regions from daily life and industrial activities.
Various snow melting measures have been implemented to melt the snow on the road surface by passing a fluid as a heat source through the pipe and to prevent freezing of water on the road surface.

For example, Japanese Utility Model Laid-Open No. 57-60906 discloses a hot water pipe, and its outline is shown in FIGS. 13 and 14. FIG. 13 shows a cross section of a road in which a hot water pipe for snow melting, that is, a heat radiation pipe is laid under the road surface, and FIG. 14 is a plan view of the hot water pipe. In this snow melting device, the hot water flowing in the main water supply pipe 19 is passed through the radiating pipes 2 arranged in a meandering manner, and the heat quantity of the hot water is passed through the radiating pipes 2 to the roadbed surface layer 3
To melt the snow and snow and ice accumulated on the road surface 1 by raising the temperature of the surface layer 3 of the roadbed. The water whose latent heat has been consumed due to the melting of snow and snow and ice and whose temperature has dropped is discharged to the drainage main pipe 20, merged with the water of another set, returned to the temperature rising part of the snow melting device system, and circulated to the water supply main pipe 19.

In addition to this, as an example of using a heat radiation pipe with fins, there is one in which a spiral fin is provided as described in Japanese Patent Application Laid-Open No. 4-261976, the outline of which is shown in FIGS.
It is as shown in 6. In this device, when hot water is passed through the finned heat radiating pipe 2a, the working fluid inside the evaporation section of the heat transfer body is heated and vaporized, and the heat quantity of the hot water is taken as evaporation latent heat and passes through the heat transfer body. Move to the condenser.
The steam heat of the working fluid that has moved to the condensing portion is transferred to the spiral-shaped inclined fins 2b and melts snow and snow and ice.

In the pipes for snow melting used in these conventional techniques, the former is a heat radiating pipe 2 which is a circular pipe, and the latter is a fin in which inclined fins 2b are fixed spirally around the circular pipe at an appropriate pitch. It is the attached heat radiation pipe 2a.

[0006]

Since the heat radiation pipe 2 is a simple tubular shape, it has poor heat radiation characteristics, requires a long time to heat up the surface of the roadbed required for snow melting, and takes a long time to develop the ability to melt snow and ice on the road surface. Needed. Therefore, in order to prevent snow accumulation on the road surface, it is necessary to predict snowfall and operate the apparatus before the snowfall to preheat the roadbed surface layer, which raises a problem of high running cost.

On the other hand, the spiral fin 2 is, for example, in the case where it is buried under the road surface, the spiral fin 2 has a spiral shape.
Although the heat transfer characteristics to the surface layer of the roadbed are improved by b, the temperature is increased to the lower layer of the roadbed that does not need to be heated, which is wasteful in terms of heat consumption, and there is a problem that the running cost becomes high.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a snow melting apparatus which can perform snowfall on a road surface, melting snow and ice and frozen water quickly and efficiently and has a low running cost.

[0009]

DISCLOSURE OF THE INVENTION According to the present invention, in a heat radiating pipe snow melting apparatus which is installed inside a surface layer of a roadbed and allows a thermal fluid to pass through inside, a fin is fixed to an upper portion of the heat radiating pipe and a heat insulating material is provided to a lower portion thereof. A heat-dissipating pipe snow melting device with an upper fin, characterized by: It is preferable that the heat radiation pipes are arranged in a meandering manner in a precast concrete panel molded into a predetermined size.

[0010]

In the radiating pipe snow melting apparatus of the present invention, the heat of the fluid serving as the heat source flowing in the radiating pipe is efficiently conducted in the road surface direction by the fins fixed to the upper portion of the radiating pipe, and the melting efficiency of the road surface is improved. , The heat insulation material provided under the heat dissipation pipe prevents unnecessary heat dissipation to the lower part of the roadbed,
The heat can be further dissipated to the surface layer, and the snow and ice can be efficiently melted.

FIG. 4 schematically shows an indoor experimental apparatus used to grasp the performance of the radiating pipe snow melting apparatus of the present invention. As shown in FIGS. 5 to 8, the test piece was one in which three types of heat dissipation pipes were embedded in a concrete slab 12 having a width of 600 mm, a length of 1000 mm, and a thickness of 250 mm. Each of the heat radiating pipes is a heat radiating pipe 2 shown in FIG. 6, a heat radiating pipe with an upper fin 2c shown in FIG. 7, and a heat radiating material 4 provided below the heat radiating pipe with an upper fin shown in FIG. Radiant pipe snow melting device 2d
And The warm water heated to 20 ° C. by the heater 10 is passed through the circulation pump 11 to each radiating pipe at a flow rate of 0.3 m ³ / H, and the inlet thermometer 13 and the outlet thermometer 14 of each radiating pipe are supplied.
The water temperature was measured with and the results are shown in FIG.

[0012]

Embodiments of the present invention will be described below.

FIG. 1 is a cross-sectional view of an embodiment of the present invention in which a heat radiating pipe 2c with an upper fin is embedded inside a roadbed surface layer 3 and a heat insulating material 4 is provided as a heat insulating layer in the lower portion.

When the roadbed surface layer 3 is paved with asphalt or concrete, the heat radiation pipes 2c with upper fins are arranged in a meandering manner and buried at a predetermined depth from the road surface. The heat insulating material 4 is selected from heat insulating materials having a heat insulating property such as ceramics, bricks, and foamed concrete, and having a strength capable of withstanding a load from the road surface.

2 and 3 show a heat radiating pipe 2c with an upper fin used in the heat radiating pipe snow melting apparatus of the present invention.

The upper fins are fixed to the upper part of the heat radiating pipe 2c with the upper fins, through which a hot fluid such as hot water is passed, by welding or the like at an appropriate pitch. The shape of the fin has an opening angle θ as shown in FIG.
= 60 to 180 ° fan-shaped upper fins 2e arranged at a pitch of about 15 to 30 mm in the pipe axis direction, or a rectangular plate-shaped upper fin 2f in the pipe circumferential direction as shown in FIG. It should be arranged at a different pitch. The materials of the upper fin heat dissipation pipe 2c and the fins 2e, 2f are
Select from stainless steel, general steel coating materials, aluminum, copper, etc., considering strength, rust prevention, cost, heat transfer characteristics, etc. Although it is expensive in terms of cost, aluminum and copper are advantageous in terms of heat transfer characteristics.

2 (c) and 3 (c) show an example in which the heat insulating material 4 is directly attached to the lower portion of the upper fin-equipped radiating pipe 2c. The heat insulating material 4 is molded in conformity with the shape of the upper fin-equipped heat radiation pipe 2c, and is attached to the lower portion of the upper fin-equipped heat radiation pipe 2c. Even if a heat insulation layer cannot be provided due to the road structure,
The heat insulating material 4 has the same effect.

10 to 12 show an embodiment of the present invention in which the radiating pipe with an upper fin 2c is embedded in a precast concrete panel 16 molded to a predetermined size.

The radiating pipe 2c with the upper fins may be directly embedded in the roadbed at the time of road construction, but if it is integrally arranged on the precast concrete panel 16, the work period for on-site installation can be shortened and the construction work can be shortened. This will reduce traffic obstacles and facilitate roadbed maintenance.

When the heat radiation pipe 2c with the upper fins is arranged on the precast concrete panel 16, the heat radiation pipe 2c with the upper fins is attached to the precast concrete panel 16 of a predetermined size as shown in FIG. The heat-dissipating material 4 is provided as a heat-insulating layer on the lower side of the heat-dissipating pipe 2c with the upper fins, and the bypass pipe 17 is embedded on two sides of the precast concrete panel 16 in advance. . The precast concrete panel 16 is provided with cutouts 18 at four corners, and the cutouts 18 are provided in the bypass pipe 1
A connection port for the end of 7 and the end of the upper fin-equipped radiating pipe 2c is provided.

FIG. 12 shows the precast concrete panel 16 molded as described above arranged on an actual road.

After arranging each precast concrete panel 16 in the width of the road, the ends of the water supply main pipe 19, the drain main pipe 20 and the upper finned heat radiating pipe 2c embedded in the road shoulder portion or the median strip are embedded in the precast concrete panel 16. Connect the water supply port or drainage port of the unit. At this time, the heat radiation pipe 2 with the upper fin of the precast concrete panel 16 separated from the water supply main pipe 19 and the drain main pipe 20
The bypass pipe 17 is used for connection with c. Further, the water supply port and the water discharge port of the upper fin-equipped radiating pipe 2c embedded in the adjacent precast concrete panel 16 are connected with a flexible hose or the like so that they can follow temperature distortion and the like. The cutouts 18 at the four corners of the precast concrete panel 16 are filled with concrete or asphalt after the connection of the water supply / drainage pipe or the connection of the bypass pipe 17 is completed, or a lid is provided to prevent unevenness in the road surface height. Keep it.

Next, a method of operating the snow melting apparatus of the present invention will be described. When a hot fluid such as hot water, steam, or warm air that flows as a heat source flows through the upper fin-equipped heat radiating pipe 2c, the heat quantity of the heat fluid is transferred to the upper fin-equipped heat radiating pipe 2c,
The entire roadbed surface layer 3 is heated and heated almost uniformly. At this time, the amount of heat transferred to the heat radiation pipe 2c with the upper fins is efficiently transferred to the upper part of the roadbed surface layer 3 and the road surface 1 direction by the upper fins 2e and 2f installed on the upper parts of the pipes. It is heated and melted by the heat of the upper portion of the roadbed surface layer 3, and snow can be prevented. Also, when the road surface 1 has water, the freezing is similarly prevented. The heat fluid after radiating heat is circulated to the heat source generating portion of the system by the circulation pump, and is sent to the heat radiating pipe with upper fin 2c which has obtained the amount of heat. By repeating this operation, the upper part of the roadbed surface layer 3 is efficiently heated, the time required for melting the snow and ice on the road surface 1 is extremely shortened as compared with the conventional heat radiating pipe 2, and the running cost can be reduced.

When the material of the roadbed surface layer 3 is concrete, since the heat radiation pipe 2c with the upper fins is made of metal, it acts as a reinforcing bar of concrete, which is also useful for reducing the amount of reinforcing bar.

[0025]

INDUSTRIAL APPLICABILITY The snow melting device of the present invention can prevent wasteful heat transfer to the lower part of the roadbed and can quickly and efficiently transfer the heat quantity of the heat fluid to the road surface near the road surface. It is possible to shorten the time required for raising the temperature and develop the ability of melting snow and ice on the road surface in a short time, and reduce the snow melting running cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a snow melting apparatus of the present invention.

FIG. 2 is a view showing a heat dissipation pipe with an upper fin.

FIG. 3 is a view showing a heat dissipation pipe with an upper fin.

FIG. 4 is a diagram showing a performance test device for a heat radiating pipe.

FIG. 5 is a diagram showing a shape of a test body used for a performance test of a heat radiation pipe.

FIG. 6 is a view showing a shape of a test body used for a performance test of a heat radiation pipe.

FIG. 7 is a diagram showing a shape of a test body used for a performance test of a heat radiation pipe.

FIG. 8 is a diagram showing a shape of a test body used for a performance test of a heat radiation pipe.

FIG. 9 is a diagram showing a result of a performance experiment of each heat radiation pipe.

FIG. 10 is a diagram showing an example of the present invention using a precast concrete panel.

FIG. 11 is a cross-sectional view showing an example of the present invention using a precast concrete panel.

FIG. 12 is a cross-sectional view showing an example of the present invention using a precast concrete panel.

FIG. 13 is a sectional view showing a conventional heat radiating pipe snow melting apparatus.

FIG. 14 is a sectional view showing a conventional radiating pipe snow melting apparatus.

FIG. 15 is a view showing a conventional finned radiating pipe provided with spiral fins.

FIG. 16 is a diagram showing a conventional finned heat radiation pipe provided with spiral fins.

[Explanation of symbols]

 1 Road Surface 2 Heat Dissipation Pipe 2a Fin Heat Dissipation Pipe 2b Inclined Fin 2c Top Fin Heat Dissipation Pipe 2d Heat Dissipation Pipe Snow Melting Device 2e Upper Fin 2f Upper Fin 10 Heating Machine 11 Circulation Pump 12 Concrete Plate 13 Inlet Thermometer 14 Outlet Thermometer 16 Precast Concrete Panel 17 Bypass pipe 18 Notch 19 Water supply main pipe 20 Drainage main pipe

Claims (2)

[Claims] 1. A heat radiating pipe snow melting apparatus which is installed inside a surface layer of a roadbed and allows a thermal fluid to pass through inside thereof, wherein fins are fixed to an upper portion of the heat radiating pipe, and a heat insulating material is provided to a lower portion thereof. Pipe snow melting equipment. 2. The snow radiating device with an upper fin according to claim 1, wherein the heat radiating pipe is arranged in a meandering manner in a precast concrete panel molded into a predetermined size.