JPH0567606U - Hot water circulation type snow melting system - Google Patents

Abstract

(57) [Summary] [Purpose] To improve workability and heat collection efficiency. [Structure] In a pipeline embedded below the road surface, a ratio t / D ≦ 0.05 of the outer diameter D of the large diameter portion 1a and the wall thickness t, the pitch P of the large diameter portion 1a, the large diameter portion 1a and the small diameter portion 1a. A stainless steel corrugated tube 1 having a ratio h / P ≦ 0.5 with respect to the outer diameter difference h from the portion 1b is used, and hot water is circulated in the corrugated tube 1 to perform snow melting.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot water circulation type snow melting system in which hot water serving as a heat source for snow melting is circulated in a pipe buried under a road surface.

[0002]

[Prior Art]

 In this type of snow melting system that uses hot water such as hot spring waste water as a heat source, a pipe consisting of a metal straight pipe or a resin pipe is buried under the road surface, and hot water is flowed through this pipe to perform snow melting. For example, in the case of a metal straight pipe, bending is difficult, so a pipe joint such as an elbow is used to form a series of pipe lines.

[0003]

[Problems to be solved by the device]

 Therefore, in the above-mentioned conventional hot water circulation type snow melting system, when a metal straight pipe is used, it is difficult to bend and a pipe joint such as an elbow is used, so that the workability is poor and the installation work takes time. there were. In addition, for example, when a nylon pipe is used as the resin pipe, the heat resistance temperature of the nylon pipe is as low as about 180 ° C. Therefore, when embedding in the asphalt pavement, for example, circulating cooling water in the pipe. However, there was a problem that it was necessary to carry out paving work, and the construction work was complicated. In addition, since the compressive strength is lower than that of metal pipes, when a heavy load is applied to the laid road surface, it is necessary to make the burial depth deeper than that of metal pipes. There was a problem of reduced efficiency. Furthermore, since the difference in linear expansion coefficient from the road surface pavement material such as concrete is large, the pipe may be deformed or damaged during thermal expansion. Further, there is a problem that the laying pitch needs to be narrowed because the thermal conductivity is small and the thermal resistance is large as compared with the metal pipe.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a hot water circulation snow melting system that is excellent in workability and that can efficiently use the heat of hot water that is circulated as a heat source.

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides a hot water circulation type snow melting system in which hot water is circulated in a pipeline laid under the road surface to prevent snow melting and freezing on the road surface. The ratio t / D of the wall thickness t to the outer diameter D of the large diameter portion is 0.05 or less, and the ratio h / P between the pitch P of the large diameter portion and the difference h between the large diameter portion radius and the small diameter portion radius is It is characterized in that it is formed by a stainless steel corrugated pipe of 0.5 or less.

[0006]

[Action]

 As described above, in this hot water circulation type snow melting system, the corrugated pipe made of stainless steel used for the pipeline is used, and the ratio t / D of the wall thickness t to the outer diameter D of the large diameter part is 0 as the corrugated pipe. Since it is a pipe material with a pitch P of 0.05 or less and a ratio h / P of the difference h between the radius of the large diameter portion and the radius of the small diameter portion of 0.5 or less and the pitch P of the large diameter portion, it is easily bent during installation. Since it can be processed, it is excellent in workability, and because the heat dissipation area is greatly increased compared to a straight pipe, it is also excellent in heat dissipation.In addition, since the inner diameter of the part where hot water flows changes, turbulent flow occurs in the hot water flowing inside. It is generated and stirred, and the heat of hot water can be used efficiently.

[0007]

【Example】

 An embodiment in which the hot water circulation type snow melting system of the present invention is applied to a hot water circulation type road snow melting device in which warm water heated by a heater is circulated by a pump to melt snow will be described with reference to FIG. 1 and FIG. Explain.

1 and 2 show a first embodiment of a road snow melting device, and FIG. 1 is a sectional view showing an example of a stainless steel corrugated pipe used in this embodiment. The standard is that the outer diameter D of the large diameter portion 1a is 26.5 mm, the wall thickness t is 0.5 mm, the pitch P of the large diameter portion 1a is 8 mm, the radius of the large diameter portion 1a and the radius of the small diameter portion 1b. The difference h is 3 mm, and therefore, the conditions of t / D ≦ 0.05 and h / P ≦ 0.5 are met. Then, as shown in FIG. 2, the corrugated pipe 1 is laid on the concrete pavement material layer 2 of the snow-melting road at a predetermined interval, and is also applied on the concrete pavement material layer 2. It is embedded in the asphalt layer 3 which is a surface paving material. In addition, a hot water boiler and a circulation pump, which are not shown, are provided in this snow melting device so that maintenance and inspection can be performed on the roadside belt.

When hot water is circulated in the corrugated pipe 1 buried in the asphalt layer 3, the heat of the hot water is transferred from the stainless steel corrugated pipe 1 to the asphalt layer 3 to raise the temperature of the road surface. This will prevent snow from melting on the road surface and snowfall at the time of snowfall, or prevent freezing of the wet road surface when the temperature drops.

Further, in this embodiment, as the conduit material, the large diameter portion 1a has an outer diameter D of 26.5 mm and a wall thickness t of 0.5 mm, and the large diameter portion 1a has a pitch P of 8 mm. When the stainless steel corrugated pipe 1 with a difference h between the radius of the diameter portion 1a and the radius of the small diameter portion 1b is 3 mm is used, it has excellent compressive strength and heat resistance, and is installed before asphalt pavement. Moreover, even if it is buried in high-temperature asphalt, it is not deformed or damaged by heat, and can withstand the pressure of the road roller. Further, since the pitch P of the large diameter portion 1a of the corrugated pipe 1 is 8 mm and the difference h between the radius of the large diameter portion 1a and the radius of the small diameter portion 1b is 3 mm, the portion through which the hot water flows is the large diameter portion and the small diameter portion. The turbulent flow is apt to occur in the hot water flowing inside, and the thermal conductivity of the corrugated tube 1 is 14 Kcal / m.hr ° C and the thermal conductivity of the nylon tube (0.2 Kcal / m). The heat of hot water is efficiently transferred to the corrugated pipe 1 and the efficiency of heat collection is good, so that snow melting is performed efficiently.

Furthermore, the corrugated tube 1 made of stainless steel, a linear expansion coefficient 16.7 × 1 0 ^-6 / ℃, linear expansion coefficient of the nylon tube (96 × 10 ^-6 / ℃) of concrete pavement layer from Since the coefficient of linear expansion is close to (12.7 × 10 ⁻⁶ / ° C.), it is possible to prevent deformation and damage during thermal expansion as in the case of using a nylon tube. Moreover, since the specific heat is larger than that of nylon pipes, the pitch of the corrugated pipes can be widened and the length of the pipe line per unit area of the road surface can be reduced.

FIG. 3 shows a second embodiment of the present invention, which is a hot water flow-through type snow melting apparatus 10 in which waste hot spring water is used as a heat source for snow melting, and is shown in two corrugated pipes made of stainless steel. The hot spring waste water is made to flow, and the same two corrugated pipes 1 as in the case of the first embodiment are laid in a bundle, and one of the two end portions on the same side is the hot spring waste water inlet. Is the outlet, and at the other end, one of the two is the outlet of the hot spring waste water and the other is the inlet.

In this snow melting apparatus, the use of the corrugated pipe 1 provides substantially the same effect as in the case of the first embodiment, and the two corrugated pipes 1, 1 are bundled and laid. One end is the hot spring waste water inlet and the other is the outlet, and the flow direction is reversed, so there is a drawback of the hot water circulation type snow melting device. The occurrence of snow is prevented, and uniform snow melting on the road surface can be performed.

In both of the above embodiments, the case where the present invention is applied to the road snow melting device has been described, but the present invention can be suitably applied to a snow melting device that melts snow in a place other than the road.

[0015]

[Effect of the device]

 As described above, in the present invention, in the hot water circulation type snow melting system in which hot water is circulated in the pipe line laid under the road surface to prevent snow melting and freezing of the road surface, the pipe line has a large diameter portion outer diameter D. The ratio t / D of the wall thickness t is 0.05 or less, and the ratio h / P between the pitch P of the large diameter part and the difference h between the large diameter part radius and the small diameter part radius is 0.5 or less. Since it is made of a stainless steel corrugated pipe, it has excellent corrosion resistance, can be easily bent during installation, and can collect snow more efficiently than warm water to melt snow.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a corrugated pipe used in a road snow melting device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a buried state of the road snow melting device of the first embodiment.

FIG. 3 is a plan view showing a pipeline of a road snow melting device according to a second embodiment.

[Explanation of symbols]

 1 Corrugated pipe 1a Large diameter part 1b Small diameter part 2 Concrete pavement material layer 3 Asphalt layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masahiko Ito 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Creator Shinichi Sugihara 1-1-5, Kiba, Koto-ku, Tokyo Fujikura Electric wire company (72) Inventor Koichi Masuko 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. (72) Yuuji Saito 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric line Co., Ltd. (72) Shinji Ishii, 1007 Izumisawa, Chitose, Hokkaido 151 151 Fujikura, Hokkaido

Claims (1)

[Scope of utility model registration request] 1. A hot water circulation type snow melting system for preventing snow melting and freezing on a road surface by circulating hot water through a pipe line laid below the road surface, wherein the pipe line has a wall thickness t with respect to a large diameter portion outer diameter D. Ratio t / D
Is less than or equal to 0.05, and the ratio h / P of the pitch P of the large diameter portion and the difference h between the large diameter portion radius and the small diameter portion radius is 0.5 or less. A hot water circulation type snow melting system that is characterized by being installed.