JP2004257105A - Road heating apparatus for tunnel entrance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the total cost for a road heating apparatus in a road near a tunnel entrance in a snow covered area to a low cost. <P>SOLUTION: This road heating apparatus for the tunnel entrance is provided with a heat pump 20 installed near the entrance of a tunnel 2; a tunnel spring water lead-in means 10 for leading spring water in the tunnel 2 to an evaporator 27 of the heat pump 20; road heating piping 40 laid under the road surface of the tunnel entrance; and an antifreezing solution circulating means 30 for circulating an antifreezing solution between a condenser 22 of the heat pump 20 and the road heating piping 40. Heat is pumped out of the spring water in the tunnel 2 by the heat pump 20 and supplied to the antifreezing solution, and the warmed antifreezing solution circulates through the road heating piping 40 to warm the road surface 3 to melt ice and snow. Since there is no need to generate heat using electricity or fuel, the total cost can be minimized. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a road heating device using spring water in a tunnel pit on a road or the like near a tunnel entrance.
[0002]
[Prior art]
On a road in a cold region in winter, an accident is likely to occur during snowfall or when the road surface freezes. Therefore, a road heating device that heats the road surface is installed as a means for preventing freezing and melting the snow. Road heating devices include a method of heating a road surface with a heating wire and a method of heating a road surface using heat generated by a boiler.
[0003]
There is also a method of heating a road surface by circulating an antifreeze liquid sealed in an endless pipe using geothermal heat (for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-7-190503
[Problems to be solved by the invention]
However, the method of heating a road surface using a heating wire or heat generated by a boiler has a problem in that running costs such as electricity costs and fuel costs are required.
[0006]
In addition, in the method of heating the road surface using geothermal energy, although there is no cost for generating heat, a deep hole must be excavated vertically downward using geothermal energy, which increases equipment costs. was there.
[0007]
It is an object of the present invention to reduce the total cost of a road heating device on a road near a tunnel entrance or the like in a snowy area.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, an invention according to claim 1 of the present invention is a load heating device for a tunnel entrance and exit, wherein a heat pump installed near the entrance and exit of the tunnel and the spring water in the tunnel pit are supplied to the heat pump. Tunnel spring water introduction means to be introduced into the evaporator, a load heating pipe laid under the road surface of the tunnel entrance, and an antifreeze liquid circulated between the condenser of the heat pump and the inside of the load heating pipe. Antifreeze circulation means.
[0009]
According to the first aspect of the present invention, the heat pump installed near the entrance of the tunnel pumps out heat from the spring water in the tunnel and supplies it to the antifreeze, and the warmed antifreeze is laid under the road surface of the tunnel entrance. Since the road heating pipes are circulated to heat the road surface and melt the ice and snow, there is no need to generate heat using electricity or fuel, and running costs such as electricity and fuel costs are reduced compared to other construction methods. It can be cheap. In addition, since the spring water in the tunnel pit is used, the equipment cost can be reduced and the total cost can be minimized.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic view of a tunnel entrance in which the present invention is implemented. A tunnel 2 is provided in the ground 1, and a road heating device of the present invention is provided near an entrance of the tunnel 2.
[0011]
FIG. 2 shows a schematic view of the road heating device of the present invention. The load heating apparatus of the present invention uses spring water in a tunnel pit which has a substantially constant temperature throughout the year. The tunnel spring water introduction means 10, heat pump 20, antifreeze circulating means 30, road heating And a general piping 40.
[0012]
The tunnel spring water introduction means 10 is for introducing the spring water in the two tunnels into the evaporator 27 of the heat pump 20, and includes a spring main pipe 11, an intake basin 12, a water supply pipe 13, and the like.
The spring main pipe 11 is a pipe through which spring water of about 10 ° C. flowing from the inside of the two tunnels flows, and supplies the spring water to the intake basin 12.
[0013]
The intake basin 12 is a basin for collecting the spring water in the two tunnels. The spring basin is supplied with the spring water from the spring main 11, and the excess water is drained to maintain an appropriate water level.
An intake port of a water supply pipe 13 that supplies spring water in the two tunnels to an evaporator 27 of a heat pump 20 via a pump 14 is provided inside the intake basin 12.
[0014]
The water supply pipe 13 is provided with a pump 14 for pumping water from the intake basin 12 into the two tunnels, and instruments 15 such as a ball valve, a solenoid valve, and a flow meter. In order to prevent the water in the water supply pipe 13 from freezing, the temperature should not be lower than 5 ° C. (for example, by adjusting the flow rate) in consideration of safety.
The water supply pipe 13 passes through the inside of the evaporator 27 constituting the heat pump 20, and transfers the heat of the spring water in the tunnel well to the refrigerant in the heat pump 20 inside the evaporator 27. The water in the water supply pipe 13 that has transmitted heat to the refrigerant inside the evaporator 27 is drained.
[0015]
The intake basin 12 of the tunnel spring water introduction means 10 may be supplied with well water, hot spring water, industrial waste hot water or the like according to the surrounding environment, in addition to the spring water in the two tunnels.
[0016]
The heat pump 20 installed near the entrance and exit of the tunnel 2 draws heat from spring water in the tunnel 2 to heat the antifreeze in the antifreeze circulation means 30.
In the heat pump 20, a compressor 21, a condenser 22, a liquid receiver 23, a dryer 24, a sight glass 25, an expansion valve 26, an evaporator 27, and the like are connected annularly by piping, and a refrigerant is sealed therein.
[0017]
The compressor 21 applies pressure to the refrigerant and supplies the refrigerant to the condenser 22. An instrument such as a pressure gauge is provided in a pipe between the compressor 21 and the condenser 22.
[0018]
The condenser 22 condenses the gaseous refrigerant supplied from the compressor 21 and transmits the generated heat of condensation to the antifreeze liquid inside the antifreeze liquid circulation means 30. At this time, the temperature of the antifreeze is set to about 30 ° C. If the temperature of the antifreeze is too low, the melting speed of ice and snow on the road surface is low, and if the temperature is too high, the energy efficiency of the heat pump deteriorates.
[0019]
The liquid receiver 23 supplies only the liquefied portion of the refrigerant cooled to the antifreeze by the condenser 22 to the evaporator 27. A dryer 24, a sight glass 25, an expansion valve 26 and the like are provided between the liquid receiver and the evaporator 27.
The drier 24 removes water in the refrigerant with a desiccant or the like.
The sight glass 25 is for observing the flow of the refrigerant supplied to the evaporator 27 in the pipe.
The expansion valve 26 functions to reduce the pressure of the refrigerant supplied to the evaporator 27.
[0020]
The evaporator 27 vaporizes the refrigerant and absorbs the heat of evaporation from the water supply pipe 13 in the evaporator 27. In addition, when absorbing heat from the water supply pipe 13, the temperature of the spring water does not drop below 5 ° C. by adjusting the flow rate of the refrigerant, etc., in consideration of safety so that the water in the water supply pipe 13 does not freeze. To do.
The vaporized refrigerant is sent to the compressor 21 again, pressurized, and supplied to the condenser 22 again.
[0021]
As described above, the heat pump 20 circulates the refrigerant to release the heat absorbed from the spring water in the two tunnels by the evaporator 27 to the condenser 22 for transmission to the antifreeze circulating means 30. Further, the heat pump is provided with a four-way valve (not shown). By rotating the four-way valve, the roles of the evaporator 27 and the condenser 22 are exchanged, and heat is transferred from the antifreeze circulating means 30 to the tunnel spring water introducing means 10. You can also.
[0022]
The antifreeze circulating means 30 circulates the antifreeze between the condenser 22 of the heat pump 20 and the load heating pipe 40, and includes a circulation pipe 31 and two headers 32, 32 and the like.
[0023]
The circulation pipe 31 passes through the inside of the condenser 22 of the heat pump 20, and transfers heat from the refrigerant to the antifreeze. Both ends of the circulation pipe 31 are connected to two headers 32, 32. In addition, a circulation pump 33 is provided in the circulation pipe 31, and the heated antifreeze is sent to the load heating pipe 40 and circulated. Further, a flow meter 34 for measuring the flow rate of the antifreeze and an expansion tank 35 for adjusting the pressure of the antifreeze are provided so that the antifreeze does not expand and damage the circulation pipe 31, the two headers 32 and 32 and the pipe 40 for road heating. Have been.
[0024]
The two headers 32, 32 connect both ends of the circulation pipe 31 and the load heating pipe 40 via the valves 36, 36.
[0025]
The components of the heat pump 20 and the antifreeze circulating means 30 are packaged in one housing 50 except for the evaporator 27 and the two headers 32, 32, and are protected from wind, rain, and snow. A rain sensor 60 is provided outside the housing 50 to measure snowfall, temperature, road surface temperature, and humidity, and to automatically start operation of the road heating device when snowfall occurs.
[0026]
Although only one load heating pipe 40 is connected to each header 32 in the drawing, a plurality of load heating pipes 40 can be connected.
[0027]
The load heating pipe 40 is a pipe made of cross-linked polyethylene or the like, and is equally spaced below the pavement of the road surface 3 as shown in FIG. 1 so as to uniformly warm the road surface 3 near the entrance and exit of the tunnel 2. It is buried meandering.
[0028]
The antifreeze liquid that has received the heat of condensation in the condenser 22 is supplied to the load heating pipe 40 through the antifreeze circulating means 30. The heat of the antifreeze is transferred to the road surface and thaws snow and ice on the road surface. The antifreeze cooled in the load heating pipe 40 returns to the antifreeze circulating means 30 and is heated again by the condenser 22.
As described above, the heat of the spring water in the two tunnels is transferred to the antifreeze via the heat pump, and the road surface is warmed to melt snow and ice.
[0029]
As described above, in the road heating apparatus of the present invention, heat is not generated by using electricity or fuel, and the heat of the spring water in the tunnel is pumped up by the heat pump and used, so that the running cost can be reduced. Also, since the spring water in the tunnel mine is used, the equipment cost can be minimized.
[0030]
【The invention's effect】
According to the first aspect of the present invention, the heat pump installed near the entrance of the tunnel pumps out heat from the spring water in the tunnel and supplies it to the antifreeze, and the warmed antifreeze is laid under the road surface of the tunnel entrance. Since the road heating pipes are circulated to heat the road surface and melt the ice and snow, there is no need to generate heat using electricity or fuel, and running costs such as electricity and fuel costs are reduced compared to other construction methods. It can be cheap. In addition, since the spring water in the tunnel pit is used, the equipment cost can be reduced and the total cost can be minimized.
[Brief description of the drawings]
FIG. 1 is a schematic view of a tunnel entrance where the present invention is implemented.
FIG. 2 is a diagram showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Tunnel 3 Road surface 4 Protective concrete 10 Tunnel spring water introduction means 11 Spring main pipe 12 Intake basin 13 Water supply pipe 14 Pumping pump 15 Meters 20 Heat pump package 21 Compressor 22 Condenser 23 Receiver 24 Dryer 25 Site Glass 26 Expansion valve 27 Evaporator 30 Antifreeze circulating means 31 Circulation pipe 32 Header 33 Circulation pump 34 Flow meter 35 Expansion tank 36 Valve 40 Road heating piping 50 Housing 60 Snowfall sensor

Claims (1)

A heat pump installed near the entrance of the tunnel,
Tunnel spring water introduction means for introducing spring water in a tunnel mine into the evaporator of the heat pump,
A pipe for road heating laid under the road surface of the tunnel entrance,
An antifreeze circulating means for circulating antifreeze between a condenser of the heat pump and the inside of the load heating pipe, and a load heating device at a tunnel entrance and exit.

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