JPH0445605B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a waterless snow removal method for melting snowfall and snow accumulation in snowy and cold regions, and in particular, uses a boiler with good thermal efficiency to melt antifreeze at a constant temperature. This invention relates to a waterless snow-melting method that allows antifreeze at a predetermined temperature to be passed through heat dissipation pipes buried in the road surface to quickly melt snow on the road during snowfall.

[Conventional technology]

Conventionally, the non-sprinkling snow removal method was JP-A-62-
As disclosed in Publication No. 228502, hot water is created by combustion in a boiler, stored in a hot water tank, and this hot water is sent to the primary side of a heat exchanger to transfer heat to the secondary side.
A circulator path is formed between the secondary side of the heat exchanger and a heat radiation pipe buried in the road surface, and the antifreeze liquid inside receives heat on the secondary side of the heat exchanger and circulates, causing it to flow over the road surface. It was known to melt snow that falls on

[Problem to be solved by the invention]

However, in such conventional waterless snow removal methods, a heat exchanger is interposed between the boiler serving as the heat source and the radiator pipes, making the facility large-scale, making maintenance complicated and the facility cost expensive. Ta. In addition, since a heat exchanger is interposed in the middle, the total volume of the pipe becomes large, and it takes time to heat the antifreeze, making it difficult to extinguish snow quickly.

Furthermore, it is difficult to ensure good operating conditions for the facility, and since it is based on experience, snow removal cannot be done quickly and operation costs are high.

Therefore, the present invention eliminates the above-mentioned drawbacks by producing antifreeze at a constant temperature of 60℃ or less in a tank using a boiler with high thermal efficiency, and by passing antifreeze at a predetermined temperature through heat dissipation pipes buried in the road surface. The purpose of the present invention is to provide a non-water-sprinkling snow-blowing method that can exhibit an immediate snow-blowing effect, is easy to maintain, and has low equipment costs.

[Means to solve the problem]

In order to achieve the above object, the present invention keeps antifreeze in a tank at a constant temperature and stores it using a boiler installed on the ground, and when it snows, the antifreeze in the tank is mixed with the antifreeze in the heat dissipation pipe buried in the road surface. A three-way mixing valve mixes the antifreeze with a three-way mixing valve to reach a predetermined temperature, and sends the antifreeze to the heat dissipation tube to melt snow falling on the road surface and prevent freezing. This is a water-sprinkling snow melting method, and a circulating heating pipe connected to the boiler is formed on one side of the tank filled with antifreeze via a circulation pump, and a main feed pipe is installed on the other side of the tank, which is buried in the road surface. A circulating heat dissipation pipe line consisting of a heat dissipation pipe and a return main pipe is formed via a circulation pump, and antifreeze liquid at a constant temperature of 60°C or less is always stored in the tank by the circulation heating pipe line. At the same time, the antifreeze in the tank and the low-temperature antifreeze in the circulation heat radiation path are mixed by a three-way mixing valve, and the antifreeze that has reached a predetermined temperature is sent to the circulation heat radiation pipe, and the antifreeze flowing in the heat radiation pipe releases heat to the road surface. This is a waterless snow melting method using boiler heating, which stores heat and radiates it onto the road surface to melt the snow falling on the road surface and prevent it from freezing.

[Effect]

The waterless snow removal method using boiler heating of the present invention uses boiler heating to remove 60% of snow in the tank during winter.
A circulation pump that stores antifreeze at a constant temperature below ℃ and stores heat by keeping it at a constant high temperature.When it snows or there is a risk of road surface freezing, the circulation pump is connected to a heat dissipation pipe by a signal emitted by a snowfall detector. is activated and the high-temperature antifreeze in the tank is sent, and the cooled low-temperature antifreeze that was originally in the pipe is returned to the tank, but some of this low-temperature antifreeze is is sent to a mixing three-way valve through a short-circuit pipe provided in front of the tank inlet/outlet, and is mixed with the high temperature antifreeze flowing from the tank into the main pipe,
Due to the action of the temperature detection device, the temperature reaches a predetermined temperature that is optimal for snow melting, and the temperature is then sent from the main feed pipe to the heat sink.

In this way, antifreeze liquid at a predetermined temperature is circulated within the heat dissipation pipes, and the heat released by the antifreeze liquid uniformly stores heat inside the pavement and radiates it onto the road surface, melting snow falling on the road surface uniformly in a short time. Can be used to prevent freezing.

Furthermore, when snow has stopped falling and the road surface is dry and there is no danger of freezing, the circulation of antifreeze on the heat dissipation pipe side is automatically stopped in response to a signal generated by the snowfall detector.

〔Example〕

Next, an embodiment of the waterless snow removal method using boiler heating according to the present invention will be described with reference to the drawings.

Figures 1 and 2 show an embodiment of the present invention, in which a boiler 2 and a tank 3 are installed in a hangar 1, connected to each other by a circulation heating pipe via a circulation pump 4. Since the antifreeze in the tank 3 is kept at a constant temperature of 60°C or less and stored, heat loss due to heat radiation can be extremely reduced.For this purpose, a temperature detection device 15 is provided in the tank 3. This temperature detection device 15 is connected to the boiler 2
and is connected to issue an operation stop signal to the circulation pump 4.

Note that the boiler 2, tank 3, and circulation pump 4 can be integrated into one unit to reduce the size.

On the other hand, the antifreeze outlet provided on the other side of the tank 3 is connected to the main feed pipe 6, heat radiation pipe 7, return main pipe 8, and inlet of the tank 3 via the circulation pump 5 to form a circulation heat radiation pipe. It has been done. Furthermore, the feed main 6
is provided with a temperature detection device 9 for antifreeze flowing through the circulation heat dissipation pipe, and a short-circuit pipe 10 for temperature adjustment is provided between the main feed pipe 6 and the return main pipe 8. A three-way mixing valve 11 is arranged in the communication section.

Further, a snowfall detector 12 and an operation panel 13 are also installed, and the circulation pump 5 is arranged to stop operation in response to a signal generated by the snowfall detector 12.

Furthermore, the heat sink 7 is buried in the road surface 14 at a depth of 3 cm to 10 cm from the surface to the center of the heat sink 7, and with an interval of 10 cm to 20 cm,
The material of this heat dissipation tube is a steel tube or a polymer resin tube. In the case of steel tubes, the end surfaces of the steel tubes are brought into contact with each other, and the abutting portion is irradiated with a focused high-energy welding beam to melt it, and the melted portion is melted. A welded joint is formed by rapidly cooling the material by spraying argon gas through a nozzle. The crystal structures of the heat-affected zone of the welded joint formed by this welding method are as follows: from the weld metal to the steel pipe base material, the crystal structures are martensite, a mixed structure of martensite and fine pearlite, fine pearlite, and pearlite in the steel pipe base material. However, since it has a small heat-affected width and a smooth welded surface, it is resistant to bending and has load-bearing properties, making it more effective when buried in road surfaces and used as heat dissipation tubes.

A steel pipe or a polymer resin pipe made of such material is used as the heat dissipation tube 7, and the inner diameter of the heat dissipation tube is 9 mm to 36 mm.
The buried structure is buried in an appropriate shape such as a meandering bent shape, a parallel shape, or a zigzag shape. Further, it is also possible to fix a steel net on the upper or lower surface of the heat dissipation tube to promote heat conduction.

In the circulation heat radiation pipe line created by the heat radiation pipes and boiler buried and fixed in this way, the pH is 7.0~
13.0 and an antifreeze solution adjusted to a concentration of 5% to 55% by weight, preferably propylene glycol, ethylene glycol, etc.

In the non-sprinkling snow melting method using boiler heating of this embodiment configured as described above, the boiler 2 and the circulation pump 4 are repeatedly operated and stopped in response to a signal emitted by the temperature detection device 15 installed in the tank 3 during winter. The antifreeze in tank 3 is kept warm and stored at a constant temperature of 60℃ or less.

When it is snowing or there is a risk of freezing on the road surface, the circulation pump 5 starts operating in response to a signal from the snowfall detector 12, and the high-temperature, constant-temperature antifreeze in the tank 3 is sent to the heat dissipation pipe 7 buried in the road surface 14. However, antifreeze at a predetermined temperature of 15°C to 20°C can be efficiently obtained by the action of the short-circuit pipe 10 provided between the main feed pipe 6 and the main return pipe 8, the mixing three-way valve 11, and the temperature detection device 9. The heat of this warm antifreeze liquid is transmitted at a flow rate of 0.3 m/sec to 1.5 m/sec and flows through the heat radiation pipe 7, and the heat of this warm antifreeze is uniformly transmitted from the heat radiation pipe to the road surface 14, where it is stored. It is possible to uniformly melt the snow falling on the top within a short period of time and to prevent freezing.

When antifreeze at a predetermined temperature is sent to the circulation heat radiation pipe line formed by the tank 3, the main feed pipe 6, the heat radiation pipe 7, and the return main pipe 8 in this way, the temperature of the antifreeze in the tank 3 decreases; The temperature inside tank 3 is 60 because the volume ratio of the circulation heat radiation pipe and tank 3 is 1:0.3 to 0.5.
℃ or less is sufficient, so there is little loss due to heat radiation, and moreover, the antifreeze at about 6℃ in the short-circuit pipe 10 is effectively used to maintain the temperature of 15℃ to 20℃ required for snow melting without watering in the main feed pipe 6. antifreeze can be sent efficiently and energy-savingly.

When the temperature inside the tank drops to below a certain temperature, the temperature detection device 15 installed inside the tank 3 issues a signal, and the boiler 2 and circulation pump 4 operate to drain the antifreeze inside the tank 3. Boiler 2 consumes less fuel because it stores heat by keeping it at a constant temperature of 60°C or less.

Furthermore, when the snow has stopped falling and the road surface is dry and there is no danger of freezing, the operation of the circulation pump 5 is automatically and promptly stopped by the signal generated by the snowfall detector 12, so there is no loss of energy.

The above road surfaces are, for example, slopes, expressway toll gates,
Intersection sidewalks, crosswalks, stairs, driveways, sidewalks,
It can be installed on road surfaces such as airport runways and port wharves as appropriate.

〔Effect of the invention〕

Since the present invention has the configuration as described above, it has the following effects.

As a waterless snow melting heat source by burning boiler fuel, antifreeze is kept at a constant temperature of 60℃ or less and stored, so there is extremely little heat loss due to heat radiation from the tank, so it can be used during snowfall or freezing. When there is a risk of snow melting, the temperature is quickly set to the optimum temperature for snow melting.
Since the adjusted antifreeze is quickly sent into the heat dissipation pipe, the heat of the antifreeze at a predetermined temperature is stored uniformly within the road surface and radiated onto the road surface, reducing the amount of snow that falls on the road surface. It is possible to uniformly melt the material within a short period of time and to prevent freezing.

In addition, when the snow stops falling and the road surface dries and there is no danger of freezing, the snow detector automatically stops operation of the facility based on a signal, and the flow of antifreeze in the heat dissipation pipes is stopped, so there is no loss of energy. In addition, operating costs are low, and maintenance is easy because the antifreeze in the heat dissipation pipes does not freeze and damage the pipes.

Furthermore, since the present invention does not require a heat exchanger, the present invention has many advantages such as high thermal efficiency, low facility costs, and extremely low heat loss.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing one embodiment of the present invention;
FIG. 2 is an enlarged perspective view of the main parts. 1... Hangar, 2... Boiler, 3... Tank, 4,
5...Circulation pump, 6...Main feed pipe, 7...Radiation pipe, 8
...Return main pipe, 9...Temperature detection device, 10...Short circuit pipe, 11...Mixing three-way valve, 12...Snowfall detector, 13
...Control panel, 14...Road surface.

Claims (1)

[Claims] 1. Antifreeze in a tank is always kept at a constant temperature and stored using a boiler installed on the ground, and when it snows, the antifreeze in the tank and the cooled antifreeze in the heat dissipation pipes buried in the road surface are mixed. A non-sprinkling snow melting method using boiler heating, characterized in that antifreeze, which has been mixed with a three-way mixing valve to reach a predetermined temperature, is sent to the heat dissipation tube to melt snow falling on the road surface and to prevent freezing. 2. On one side of the tank filled with antifreeze, a circulation heating pipe that circulates with the boiler is formed via a circulation pump, and on the other side of the tank, there are a main feed pipe, a heat radiation pipe buried in the road surface, and a main return pipe. A circulating heat dissipation pipe is formed via a circulation pump, and high temperature antifreeze is always stored in the tank by the circulation heating pipe, and when it snows, the temperature in the tank is kept at a constant temperature of 60℃ or less. The held antifreeze liquid and the low-temperature antifreeze liquid in the circulation heat radiation pipe are mixed by a three-way mixing valve, and the antifreeze liquid that has reached a predetermined temperature is sent to the circulation heat radiation pipe, and the antifreeze liquid flowing inside the heat radiation pipe is heated. A waterless snow removal method using boiler heating characterized by storing heat in the road surface and dissipating the heat onto the road surface to melt snow falling on the road surface and prevent freezing. 3. Claim 2, characterized in that the ratio of the total volume of the circulation heat radiation pipe to the volume of the tank is 1:0.3 to 0.5.
Waterless snow melting method using boiler heating as described in section.