Air circulation type snow melting equipment

Abstract

To provide an air circulation type snow melting facility capable of efficiently melting snow over a wide area by reducing heat loss, reducing installation costs, eliminating the risk of water leakage from buried piping, and reducing maintenance costs. [Solution] The air circulation type snow melting equipment 1 includes an air vent pipe 2 that is laid in a zigzag pattern on the ground 80 of the snow melting target section 8 and has an air inlet 22 and a circulation port 23, a pavement heat storage layer 4 laid on the ground 80 of the snow melting target section 8 including on the air vent pipe 2, a greenhouse 6 that is located in a position close to the snow melting target section 8 and to which the air inlet 22 and circulation port 23 of the air vent pipe 2 are connected, and a heat source 7 installed inside the greenhouse 6, with the upper peripheral wall 20 of the air vent pipe 2 contacting the pavement heat storage layer 4 and the lower peripheral wall 21 of the air vent pipe 2 that is the remainder of the upper peripheral wall 20 being covered with a heat insulating material layer 5. The air inlet 22 opens downward, and an air filter 220 can be provided in the air inlet 22.

Description

[Technical Field]

[0001] This invention relates to snow melting equipment that melts snow in a target area, and in particular to an air circulation type snow melting equipment that sends warm air through underground piping and uses the heat of this warm air to melt snow on the ground. [Background technology]

[0002] Traditionally, snow melting equipment has been used to melt snow by pumping up groundwater and sprinkling it on pavement layers such as asphalt or concrete, but because there is a risk of ground subsidence, in recent years, snow melting equipment has been put into practical use that circulates groundwater through pipes buried under the pavement to melt snow, and then returns the groundwater to the ground after use.However, in either case, there is a drawback in that it requires a large amount of money to install wells to pump up the groundwater.

[0003] Furthermore, snow melting equipment that circulates groundwater or hot water from a water heater through pipes buried under the pavement layer would leak if the pipes were damaged, reducing the snow melting effect, and requiring a great deal of money to dig up the pipes and repair them. Snow melting equipment that uses electric heating cables or snow melting nets buried under the pavement layer to supply electricity to melt snow is also widely used, but there is a risk of wire breakage or short circuit, and in the event of a breakdown, it was still necessary to remove the pavement layer to repair it. Previous snow melting equipment had the disadvantage of high maintenance costs.

[0004] For example, Patent Document 1 (Patent Publication No. 3076152) shows a sidewalk snow melting device that creates an air chamber using a groove-shaped concrete wall buried under the sidewalk along the center of its width and an iron plate sealing the top of it, with a pipe that carries a heat medium that heats the air in the air chamber and the iron plate underneath to form the surface layer of the sidewalk.This sidewalk snow melting device heats the air in the air chamber using the pipe that carries the heat medium and melts snow intensively in the center of the sidewalk above it, using minimal energy to ensure a minimum passageway that is convenient for pedestrian traffic without waste, making it thermally efficient and suitable for energy conservation.

[0005] Furthermore, Patent Document 2 (Japanese Patent No. 3998145) discloses a waterless snow melting device that melts snow on a road surface with warm or hot air, in which the road surface is made up of a number of laying bodies arranged side by side, each of which has a groove on the backside, and the grooves of each laying body are connected to form a number of inlet passages through which the warm or hot air is introduced and a number of outlet passages from which the warm or hot air is discharged, a hot water circulation pipe is provided near the end opening of each of the inlet passages, and fans are provided between each of the hot water circulation pipes and each of the inlet passages, so that the warm or hot air obtained by collecting heat from the hot water in the hot water circulation pipe is introduced into each of the inlet passages by each of the fans, and the ends of each inlet passage are connected to the ends of the outlet passages, so that the warm or hot air that has passed through the inlet passages and the outlet passages is introduced into each of the fans. The waterless snow melting device melts snow on the road surface by introducing warm or hot air into the grooves of the paving material that makes up the road surface and transferring the heat of this warm or hot air to the paving material. Because the warm or hot air is used as the heat medium, there is no need to worry about ground subsidence due to groundwater pumping, and the device is harmless to people and the environment. Furthermore, the grooves on the back of the paving material serve as a passage for the heat medium, making this a waterless snow melting device that is easy to install and maintain. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3076152 [Patent Document 2] Patent No. 3998145 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the sidewalk snow melting device of Patent Document 1 involves placing a steel plate on a groove-shaped concrete wall buried in the center of the sidewalk width and concentrating snow melting on the steel plate. However, steel plates have a higher thermal conductivity than typical asphalt or concrete pavement layers, resulting in significant heat loss to the snowmelt water and the atmosphere, and resulting in increased energy consumption, such as electricity and fuel, for heat sources such as air conditioners. Melting snow over a large area, such as a parking space, has the disadvantage of being uneconomical due to high running costs. Furthermore, the waterless snow melting device of Patent Document 2 requires a hot water circulation pipe, and if a leak occurs, the hot water circulation pipe needs to be repaired.

[0008] In view of the above situation, the present invention aims to provide an air circulation type snow melting equipment that can reduce heat loss, efficiently melt snow over a wide area, reduce installation costs, eliminate the risk of water leakage from buried piping, and reduce maintenance costs. [Means for solving the problem]

[0009] This invention provides an air circulation type snow melting equipment that includes an air duct that is piped to the area to be melted and guides heated air, and a pavement heat storage layer laid on the air duct, with the upper peripheral wall of the air duct in contact with the pavement heat storage layer, and the lower peripheral wall of the air duct that is the remainder of the upper peripheral wall being covered with a layer of insulating material.

[0010] The air circulation type snow melting system sends heated air into the ventilation pipe, eliminating the need to dig a well to pump groundwater and significantly reducing installation costs. By burying the ventilation pipe under the pavement thermal storage layer, heat from the ventilation pipe is stored in the pavement thermal storage layer, reducing heat loss and enabling more efficient snow melting. By covering the lower peripheral wall of the ventilation pipe with an insulating material layer, heat from the ventilation pipe is prevented from radiating downward, achieving more thermally efficient snow melting. By piping the air supply pipe with a slight gradient rising from the air inlet at one end to the other end, convection caused by the temperature difference between the air immediately after being heated by the heat source and the air at the other end can be used to generate an air current in the air supply pipe that guides the air toward the other end.

[0011] The snow melting target area can be a parking lot, road, sidewalk, entrance, garden, ground, or other area of ​​a site, or a building roof, rooftop, balcony, or other area. The pavement thermal storage layer can be a pavement layer with thermal storage function, such as asphalt, concrete, tile, brick, interlocking block, porous concrete, reinforced concrete, non-slip pavement, or artificial turf, or a waterproof layer with thermal storage function, such as FRP, urethane, or resin sheet on a building roof or rooftop. Since only warm air circulates through the ventilation pipe buried under the pavement thermal storage layer, water leaks and breaks do not occur. This eliminates the need to remove the pavement thermal storage layer to repair the ventilation pipe, reducing maintenance costs.

[0012] The present invention can also be an air circulation type snow melting equipment in which the upper peripheral wall of the air supply pipe, which is 1 / 10 to 9 / 10, preferably 1 / 2, of the outer diameter, is embedded within the thickness dimension of the pavement heat storage layer, and the lower peripheral wall, which is 9 / 10 to 1 / 10, preferably 1 / 2, of the outer diameter, is covered with the insulating material layer.

[0013] By embedding the upper peripheral wall, which is 1 / 10 to 9 / 10 of the outer diameter of the air supply pipeline, into the thickness dimension of the pavement heat storage layer, a heat transfer area between the air supply pipeline and the pavement heat storage layer is secured, and heat can be transferred from a position close to the surface of the pavement heat storage layer, allowing snow to melt quickly.By covering the lower peripheral wall, which is 9 / 10 to 1 / 10 of the outer diameter of the air supply pipeline, with the heat insulating material layer, downward heat radiation can be suppressed, allowing accumulated snow to melt.

[0014] By embedding the upper peripheral wall of the air supply pipe, which is less than 1 / 10 of the outer diameter, into the thickness dimension of the pavement thermal storage layer, and covering the lower peripheral wall, which is more than 9 / 10 of the outer diameter, with the insulating material layer, the heat transfer area with the pavement thermal storage layer per unit length of the air supply pipe can be further reduced, the amount of heat consumed for snow melting can be reduced, and the air supply pipe can be further extended. The thickness dimension of the pavement thermal storage layer directly above the air supply pipe can be ensured to be thick. By embedding the upper peripheral wall of the air supply pipe, which is more than 9 / 10 of the outer diameter, into the thickness dimension of the pavement thermal storage layer, and covering the lower peripheral wall, which is less than 1 / 10 of the outer diameter, with the insulating material layer, the heat transfer area with the pavement thermal storage layer per unit length of the air supply pipe can be further increased, allowing for more accumulated snow to be melted or for snow to be melted more quickly.

[0015] In the air circulation type snow melting equipment, the upper peripheral wall, which is half the outer diameter of the ventilation pipe, can be embedded in the thickness dimension of the pavement thermal storage layer, and the lower peripheral wall, which is half the outer diameter, can be covered with the insulating material layer. By embedding the upper peripheral wall, which is half the outer diameter of the air supply pipe, in the thickness dimension of the pavement thermal storage layer, a larger heat transfer area between the air supply pipe and the pavement thermal storage layer can be ensured, and heat can be transferred from a position closer to the surface of the pavement thermal storage layer, resulting in more rapid snow melting. The thickness dimension of the pavement thermal storage layer directly above the air supply pipe can be sufficiently ensured. By covering the lower peripheral wall, which is half the outer diameter of the air supply pipe, with the insulating material layer, downward heat loss can be suppressed, allowing more accumulated snow to melt or a wider area of ​​the snow melting target section to melt.

[0016] The present invention can also be applied to an air circulation type snow melting system in which a greenhouse is located close to the area to be melted, a heat source is housed in the greenhouse, the ventilation pipe is connected to the greenhouse, and the air intake of the ventilation pipe opens downward toward the heat source. According to the air circulation type snow melting equipment, the downward-opening air intake port reduces the intake of dust, pests, etc., and can prevent dust from adhering to, accumulating in, or clogging the ventilation pipe.

[0017] The heat source can be a variety of heating appliances, such as an electric heater, stove, air conditioner, oil heater, panel heater, FF-type hot air heater, or a heat exchanger connected to a circulating water heater. The heat source can utilize geothermal heat generated by circulating groundwater pumped from an existing well through a heat exchanger. The heat source can be a commercial power source, gas, fuel oil, or other energy source, and can also receive energy from a solar hot water system, solar energy power generation system, wind power generation system, or other system.

[0018] The air circulation type snow melting equipment can be provided with an air filter at the air intake. By providing a replaceable air filter at the air intake, it is possible to more reliably prevent the inhalation of dust, pests, etc., and to prevent problems such as clogged pipes. An air cleaner box with a downward-facing air filter attachment port can be provided at the air intake. The air cleaner box can reduce the suction resistance of the air intake and prevent the generation of intake noise.

[0019] The present invention can also be an air circulation type snow melting equipment in which the inner diameter of the air supply pipe is 50 mm or more, the air supply pipe is arranged in a zigzag pattern in the snow melting area, and an air supply device is provided that supplies air in the guide direction of the heated air in the ventilation pipe. According to the air circulation type snow melting equipment, by making the inner diameter of the air supply pipe 50 mm or more, the air supply resistance of the air supply and circulation is reduced compared to when the inner diameter is less than 50 mm, and heated air can be circulated more efficiently.

[0020] The air supply pipe may be one or more. One end of the air supply pipe serves as an air inlet, guiding the air heated by the heat source into the air supply pipe, and the other end serves as an exhaust port, discharging the air onto the pavement thermal storage layer or outside the snow-melting target area. The warm air discharged from the exhaust port onto the pavement thermal storage layer can melt snow and ice accumulated on the pavement thermal storage layer, and if the snow-melting target area is a parking lot, warm air can rise from under vehicles and melt ice and snow accumulated on the vehicles. The air supply pipe has one end as an air inlet and the other end as a circulation port, returning the air to the heat source and supplying it again as warmed air from the air inlet.

[0021] When the snow melting target area is a parking lot or a road, the air supply pipe can be installed so as to preferentially guide the air immediately after being heated by the heat source directly below stopped, parked, or moving vehicles (parking positions or driving lanes). The snow melting target area can be installed with a slope that is high at half the width or depth and becomes lower as it moves outward. The snow melting target area can be installed with a slope that is high at one end in the width or depth direction and becomes lower as it moves toward the other end. The air supply pipe can be installed so as to preferentially guide the air immediately after being heated by the heat source to the highest point of the snow melting target area. Meltwater can be drained along the slope of the snow melting target area toward the outside of the snow melting target area. [Effects of the Invention]

[0022] The air circulation type snow melting equipment of the present invention has the excellent effect of reducing heat loss and efficiently melting snow over a wide area, reducing installation costs, eliminating the risk of water leakage from buried piping, and reducing maintenance costs. [Brief explanation of the drawings]

[0023] [Figure 1] 1 shows an air circulation type snow melting equipment 1. (A) is a plan view showing the air circulation type snow melting equipment 1, and (B) is a cross-sectional view showing the B-B portion of FIG. 1(A). [Figure 2] FIG. 2 is a cross-sectional view showing an embedded air supply pipeline 2. [Figure 3] 1 shows an air intake port 22 of the air supply pipe 2. (A) is a cross-sectional view showing the air intake port 22 facing diagonally downward, (B) is a cross-sectional view showing the air intake port 22 opening in the lower peripheral wall 21 of the air supply pipe 2, and (C) is a cross-sectional view showing an air cleaner box 221 provided at one end of the air supply pipe 2. [Figure 4] The figure shows an air supply pipe 2 with an exhaust outlet 24 opened in the pavement thermal storage layer 4. (A) is a plan view showing the air circulation type snow melting equipment 1, (B) is a cross-sectional view showing the exhaust outlet 24, and (C) is a cross-sectional view showing another example of the exhaust outlet 24. [Figure 5] 10 is a plan view showing an air supply pipe 2 that preferentially melts snow at a position halfway along the width of a snow-melting target section 8. FIG. [Figure 6] 1 is a cross-sectional view showing an air circulation type snow melting equipment 1 in which a slight kamaboko-shaped elevation difference is provided in the pavement thermal storage layer 4. FIG. [Figure 7] FIG. 1 is a cross-sectional view showing an air circulation type snow melting equipment 1 in which a pavement thermal storage layer 4 is provided with a slight slope like a gable roof. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, the air circulation type snow melting system 1 according to this embodiment will be described in detail with reference to the drawings. In particular, this embodiment is an air circulation type snow melting system 1 that has an air duct 2 that is piped to a snow melting target section 8 and guides heated air 70, and a pavement thermal storage layer 4 laid on the air duct 2, with an upper peripheral wall 20 of the air duct 2 in contact with the pavement thermal storage layer 4, and a heat insulating layer 5 covering a lower peripheral wall 21 of the air duct 2 that is the remainder of the upper peripheral wall 20. The snow melting target section 8 can be an outdoor paved section such as an outdoor parking lot, approach, porch, or entrance.

[0025] As shown in Figures 1(A), (B) and 2, the air circulation type snow melting equipment 1 includes an air vent pipe 2 that is piped on the ground 80 of the snow melting target area 8 and has an air intake port 22 at one end and a circulation port 23 at the other end, a pavement heat storage layer 4 that is laid on the ground 80 of the snow melting target area 8 including on the air vent pipe 2, a greenhouse 6 that is arranged in a position close to the snow melting target area 8 and to which the air intake port 22 and circulation port 23 of the air vent pipe 2 are connected, and a heat source 7 that is installed within the greenhouse 6, and the upper peripheral wall 20 of the air vent pipe 2 is in contact with the pavement heat storage layer 4, and a lower peripheral wall 21 of the air vent pipe 2 that is the remainder of the upper peripheral wall 20 is covered with a heat insulating material layer 5. For example, if the snow-melting target section 8 is the rooftop of a reinforced concrete building, the insulation layer 5 and the lower peripheral wall 21 of the ventilation pipe 2 can be embedded in the reinforced concrete layer on the roof. The insulation layer 5 can be made of an insulating material such as glass wool, polystyrene foam, or foam rubber.

[0026] The ground 80 serves as the base for the pavement thermal storage layer 4, and can be, for example, a dug-down roadbed (soil) on which a layer of granular material such as quarry stone or crushed orchard is laid, with roadbed paper laid on top of the granular material layer. A greenhouse 6 can be installed in an area adjacent to the snow-melting area 8, dug deeper than the top surface of the ground 80 of the snow-melting area 8. The greenhouse 6 houses a heat source 7, has an insulated structure to prevent the leakage of warm air and the intrusion of cold air, has walls and a roof to protect against rain and wind, and can be equipped with a drainage channel to prevent the intrusion of rainwater, etc. The greenhouse 6 can be equipped with a drainage pump to prevent flooding.

[0027] The ventilation pipe 2 is laid in a zigzag pattern so as to completely cover the ground 80 of the snow-melting area 8, with an air intake port 22 at one end and a circulation port 23 at the other end both opening into the greenhouse 6. The ventilation pipe 2 can be a resin pipe, a metal pipe, a composite pipe, or the like. As shown in Figures 1(B) and 2, the ventilation pipe 2 can have an inner diameter D1 of 50 mm or more, for example, a nominal diameter D1 of 100 mm and an outer diameter D2 of 114 mm.

[0028] The ventilation duct 2 is provided with ventilation fans 3 at multiple locations along its length. The ventilation fans 3 blow air 70 heated by the heat source 7 from an air inlet 22 at one end toward a circulation port 23 at the other end. The air returned to the greenhouse 6 from the circulation port 23 can be heated by the heat source 7 and supplied again through the air inlet 22. The ventilation fans 3 activate in conjunction with the heat source 7 heating the air within the greenhouse 6 and may be equipped with a switch or control device that stops the heat source 7 from heating the air within the greenhouse 6 or when the temperature within the greenhouse 6 drops to the same temperature as or below the outside temperature. The ventilation duct 2 is buried in the ground 80, with the insulation layer 5 covering the lower peripheral wall 21, which has an outer diameter D2 (57 mm) of 1 / 2. The insulation layer 5 can be a cylindrical foam resin layer cut in half lengthwise, an insulation sheet, or the like.

[0029] A pavement thermal storage layer 4 having a thickness T1 of 150 mm is laid on the ground 80 of the snow melting target section 8, including the upper peripheral wall 20 of the ventilation pipeline 2. The pavement thermal storage layer 4 can be made of asphalt or reinforced concrete. The upper peripheral wall 20, which has a dimension R1 that is 1 / 2 (57 mm) of the outer diameter D2 of the ventilation pipeline 2, is embedded within the thickness T1 of the pavement thermal storage layer 4. A minimum thickness T2 of 93 mm can be ensured for the pavement thermal storage layer 4 above the ventilation pipeline 2. The pavement thermal storage layer 4 stores some of the heat received from the ventilation pipeline 2 and releases it to the ground surface, allowing for stable and continuous snow melting.

[0030] The air intake 22 arranged in the greenhouse 6 opens downward, is equipped with a detachable air filter 220, and can be arranged above the ascending air current of the air heated by the heat source 7. The downward-facing air intake 22 can supply warm air more smoothly. The air filter 220 prevents the inhalation of dust, insects, etc., preventing problems such as clogging and reduced flow rate in the ventilation duct 2 and making cleaning and inspection of the ventilation duct 2 unnecessary. As shown in FIG. 1(B), the air intake 22 of the ventilation duct 2 can open vertically downward.

[0031] As shown in FIG. 3(A), the air intake port 22 of the ventilation duct 2 can open diagonally downward and forward toward the heat source 7. The angle AN1 of the air intake port 22 of the ventilation duct 2 with respect to the buried (horizontal) portion can be, for example, 90° to 170°. The angle AN1 of the air intake port 22 can be, for example, 120° to 150°. As shown in FIG. 3(B), the air intake port 22 can open in the lower peripheral wall 21 of the ventilation duct 2. As shown in FIG. 3(C), the air intake port 22 can be provided with an air cleaner box 221 at one end of the ventilation duct 2. The air cleaner box 221 has an air filter mounting opening 222 on its bottom surface, and a replaceable air filter 220 can be mounted in the air filter mounting opening 222. The air cleaner box 221 can more effectively prevent noise and vibrations associated with air intake.

[0032] As shown in Fig. 1(A), the heat source 7 can be a FF-type hot air heater connected to a distribution board 9 that is connected to a commercial power source 90. A storage battery 903 that is connected to a power conditioner 902 of a solar panel 901 is connected to the distribution board 9, so that the electricity generated by the solar panel 901 can be supplied to the heat source 7, and any surplus electricity can be sold.

[0033] As shown in Figures 4(A) and (B), one or more air supply pipes 2 can be installed in the snow melting target section 8. The air supply pipes 2 can have one end formed as an air inlet 22 and the other end formed as an exhaust outlet 24. The air inlet 22 guides air 70 heated by the heat source 7 into the air supply pipes 2. The exhaust outlet 24 can open to the top surface of the pavement thermal storage layer 4 and exhaust the air upward. The warm air 70 exhausted from the exhaust outlet 24 onto the pavement thermal storage layer 4 can melt snow and ice accumulated on the pavement thermal storage layer 4. If the snow melting target section 8 is a parking lot, warm air rises from below the vehicle and can melt the snow and ice accumulated on the vehicle. Because the exhaust outlet 24 discharges heated air 70, it is less likely to cause damage to the vehicle, such as rust, compared to when discharging groundwater, etc.

[0034] As shown in FIG. 4(B), the exhaust port 24 is disposed within the thickness of the pavement thermal storage layer 4, opens upward, and is covered with a waterproof lid 240 with an exhaust gap 241. The exhaust port 24 has an air vent pipe 242 embedded above and around the periphery, flush with the upper surface of the pavement thermal storage layer 4. The air vent pipe 242 has an upper end with a dustproof mesh 243 that allows air and water to pass through. A drain pipe 244 may be provided at the bottom of the air vent pipe 242, which is embedded below the pavement thermal storage layer 4 and drains rainwater, melted snow 802, and the like that flows into the air vent pipe 242 outside the snow melting section 8. The waterproof lid 240 prevents rainwater, melted snow 802, and the like that flows in through the dustproof mesh 243 from entering the exhaust port 24. The warm air 70 discharged from the exhaust port 24 can be released onto the pavement thermal storage layer 4 through the exhaust gap 241 of the waterproof lid 240 and the dustproof mesh 243, melting snow and ice on the pavement thermal storage layer 4. The exhaust port 24 and / or the ventilation drain pipe 242 can be provided with a check valve to prevent water from flowing into the air supply pipeline 2.

[0035] As shown in FIGS. 4A and 4C, the exhaust port 24 opens downward into an air drain pipe 242. The air drain pipe 242 is a cylindrical structure with a bottom, the upper end of which is flush with the upper surface of the pavement thermal storage layer 4 and the lower end of which is buried deeper than the thermal insulation layer 5. The air drain pipe 242 has a dustproof mesh 243 at its upper end, which is air and water permeable. A drain pipe 244 may be provided at the bottom of the air drain pipe 242. The drain pipe 244 is buried in the ground 80 and drains rainwater, melted snow 802, and the like that flows into the air drain pipe 242 outside the snow melting section 8. The downward-opening air exhaust port 24 prevents rainwater, melted snow 802, and the like that flows in through the dustproof mesh 243 from entering the air exhaust port 24. The warm air 70 discharged from the exhaust port 24 can be released from inside the ventilation and drainage pipe 242 through the dustproof net 243 onto the pavement thermal storage layer 4, melting snow and ice on the pavement thermal storage layer 4. The exhaust port 24 and / or the ventilation and drainage pipe 242 can be provided with a check valve (not shown) that prevents water from flowing into the air supply pipe 2. The dustproof net 243 can have a water-repellent film that is waterproof and breathable.

[0036] 5 and 6, when the snow-melting target section 8 is a parking lot or a road, the air supply pipes 2 can be arranged so that the air 70 immediately after being heated by the heat source 7 is preferentially guided directly below a stopped, parked, or traveling vehicle 800 (parking position or driving lane). For example, the piping section 2201 near the air supply port 22 of one or more air supply pipes 2 can be buried in a position directly below the stopped, parked, or traveling vehicle 800 (parking position or driving lane) in the snow-melting target section 8, and the piping section 2202 near the circulation port 23 (or exhaust port 24) can be buried so that it is located on the outside. By locating the piping section 2201 near the air supply port 22, snow 801 or ice accumulated in the location where the vehicle 800 is located can be preferentially melted.

[0037] As shown in FIG. 6 , the snow melting target section 8 can be laid with a gentle slope, such as a semi-cylindrical, gable roof, square roof, hip roof, or dome-like shape, so that the height is directly below the stopped, parked, or moving vehicle 800 (parking position or driving lane) or at a position that is half the width and / or depth, and the slope gradually decreases toward the outside with a slight gradient suitable for drainage. Meltwater flows from higher to lower positions and is quickly drained, promoting snow melting and drying at the location where the vehicle 800 is located and more efficiently preventing refreezing. Placing the vehicle 800 at a higher position than the surrounding area and burying the piping section 2201 near the air intake vent 22 at the location where the vehicle 800 is located can further effectively melt snow. The meltwater flowing down to the outside melts the surrounding snow. By arranging an exhaust outlet 24 at the parking position of the pavement thermal storage layer 4, heated air 70 can be released from directly below the vehicle 800, melting snow and ice accumulated on the vehicle 800. Drainage can be further improved by providing gutters 81 around the outer periphery of the snow melting target section 8. The pavement thermal storage layer 4 can be provided with a gentle slope suitable for drainage, like a shed roof, in the width direction, depth direction, or diagonal direction of the snow melting target section 8.

[0038] As shown in Figure 7, if the snow melting target section 8 is a two-lane road, the piping section 2201 closest to the air intake port 22 can be buried near the road shoulder, and the piping section 2202 closest to the circulation port 23 can be buried halfway across the road (at the center line). This allows snow 801 collected on the road shoulder by snow removal to be melted preferentially. The exhaust port 24 can also be opened in the pavement thermal storage layer 4 at a position halfway across the width of each travel lane. The circulation port 23 and / or the exhaust port 24 can also be provided in a position midway along the air supply pipeline 2. [Industrial Applicability]

[0039] The air circulation type snow melting equipment of this invention can be used to melt snow in parking lots, roads, entrances, gardens, building roofs and rooftops, etc. [Explanation of symbols]

[0040] 1. Air circulation type snow melting equipment 2 Air line 20 Upper peripheral wall 21 Lower peripheral wall 22 Same air intake 3. Blower fan (air blower) 4 Asphalt (pavement heat storage layer) 5. Insulation layer 6 Greenhouse 7 Heat source 8 Snow melting area

Claims

1. A ventilation pipe that is installed in the snow melting area and guides the heated air; a pavement heat storage layer laid on the ventilation pipe; and An air circulation type snow melting equipment characterized in that the upper peripheral wall of the ventilation pipe is in contact with the pavement heat storage layer, and the lower peripheral wall of the ventilation pipe that is the remainder of the upper peripheral wall is covered with an insulating material layer.

2. The air supply pipe has an upper peripheral wall, which is 1 / 10 to 9 / 10, preferably 1 / 2, of the outer diameter, embedded in the thickness dimension of the pavement heat storage layer, and a lower peripheral wall, which is 9 / 10 to 1 / 10, preferably 1 / 2, of the outer diameter, covered with the insulating material layer.

3. A greenhouse is arranged in a position adjacent to the snow melting target section, A heat source is housed within the greenhouse; connecting the ventilation pipe to the greenhouse; The air circulation type snow melting system according to claim 1 , wherein the air intake port of the ventilation pipe opens downward toward the heat source.

4. The inner diameter of the air supply pipe is 50 mm or more, The air supply pipe is arranged in a zigzag pattern in the snow melting target section, 4. The air circulation type snow melting equipment according to claim 1, further comprising an air supply device for supplying air in the guide direction of the heated air in the ventilation pipe.

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