JPH02210102A - Melting snow on road and freezing-proof device - Google Patents

Abstract

PURPOSE:To prevent freezing from being generated, at a low cost by forming the surface course of road with heat accumulators, and by providing a surface course interior, with air ducts embedded in parallel with the surface of the load, and heat pumps or air transmitting pipes embedded in the directions connection-crossed over the air ducts. CONSTITUTION:The lower side of the surface course 3 of a carriage-way 1 and a footway 2 is provided with the adiabatic course 6 of quarrying, volcanic ash, and the like. After that, between the pipes of two headers, pipes are arranged in parallel with each other in the shape of a lattice, and a header is connected to a main blast pipe 11, and another header is connected to a main exhaust pipe 12, and air ducts 7 are formed. After that, heat pipes 8 are arranged in the directions orthogonal to the pipes arranged in parallel with each other in the shape of the lattice. Then, the air ducts 7 and the heat pipes 8 are embedded in a heat accumulator 4, and on the surface, asphalt 5 is laid, and warmed air from a main heat source is fed to the air ducts 7 of respective blocks.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a device for melting snow on a road surface and for preventing water from freezing on a road surface.

BACKGROUND OF THE INVENTION Securing road traffic in winter in cold regions is an important issue, and various measures have been taken in the past for this purpose. For example, a water-sprinkling snow-melting system is known as a relatively effective means of combating snowfall, by pumping up groundwater and spraying it on the road surface, melting the snow with the heat of the groundwater and flushing the snow away into drainage ditches. ing. Furthermore, as a means for melting snow by increasing the temperature of the road surface, for example, a method is known in which so-called geothermal heat contained in groundwater or the like is conveyed directly below the road surface using a heat pipe, and the snow is melted by the heat.

Problems to be Solved by the Invention However, in conventional water sprinkling snow removal systems, underground water is directly sprayed onto the road surface, and since the temperature of the ground water is, for example, about 8°C, unless there is an extremely large amount of snowfall, it is not possible to spray ground water onto the road surface. However, even if watering is performed only when it snows, a considerable amount of groundwater will be pumped up, leading to problems such as ground subsidence and groundwater depletion. In addition, even if the temperature of groundwater is around 8℃ and it has a large amount of heat, after it is sprayed on the road surface, the heat is rapidly taken away by the snow and the atmosphere, so the temperature of the sprayed water decreases, and the water temperature near the roadside strip. When the temperature drops to about 0°C and freezes, or when the atmospheric temperature drops significantly such as at night, there is a risk that the sprayed water will freeze in the center of the road surface. Furthermore, since water has a high specific heat, it is effective to use groundwater as a heat source for snow melting, but on the other hand, its high density may encourage road erosion and cause severe damage to roads.

On the other hand, the method of melting snow by transporting geothermal heat close to the road surface using a heat pipe requires burying the heat pipe with the bottom end inserted into a hot spot deep underground, which requires extensive burying work. There was some inconvenience. In addition, when hot water is used as a heat source to heat the road surface, the depth of burial of the heat pipe can be made shallow, but if the 4S construction is used to carry hot water over a wide area using underground piping,
If water leaks, there is a risk that the roadbed will be severely eroded and damaged. In addition, when a heat pipe is used, it is possible to avoid pollution problems caused by spraying anti-freezing agents and the like.

This invention was made against the background of the above-mentioned circumstances, and aims to provide a device that can melt snow without damaging roads, prevent freezing, and has low running costs. .

Means for Solving the Problems In order to achieve the above object, the present invention forms the surface layer of the road with a heat storage body, and provides an air guide system for flowing hot air sent from a heating source into the surface layer. A pipe is buried almost parallel to the road surface, and a heat pipe or a blower pipe is connected to the air guide pipe and is buried in the surface layer in a direction intersecting the air guide pipe. .

Further, in the present invention, a heat insulating layer can be provided below the air guide pipe and the heat pipe or the blower pipe.

Further, in the present invention, a plurality of the air guide tubes may be embedded in the surface layer so as to be parallel to each other, and the heat pipes or the air blower tubes may be connected to adjacent air guide tubes.

Further, in the present invention, a water spraying means for spraying water onto the surface of the road can be provided.

Function: In the device of the present invention, the heat of the warm air flowing through the air guide pipe is
Heat is applied to the surface layer of the road, and since that surface layer is made of a heat storage material, heat is stored here. In that case,'#
Even if the air guide pipes are buried at wide intervals, heat pipes or blower pipes carry heat to areas far away from the air guide pipes, so the entire surface layer is heated almost evenly and stores heat, resulting in
Improves heat storage efficiency. When it snows, the heat of the surface layer melts the snow, and even if the atmospheric temperature drops and the water on the road surface cools, the heat of the surface layer is given to that water, so the snow melts. Freezing is prevented. During snow melting and freezing prevention, the entire surface layer is evenly heated by heat pipes or blower pipes, so
Ice and snow are melted equally over the entire road surface. Furthermore, even if there is a leak in the air guide pipe, there is no risk of erosion of the N board because the density of the hot air is low.

On the other hand, by providing a heat insulating layer below the surface layer, the heat imparted to the surface layer by hot air can be effectively used for melting ice and snow.

Furthermore, when watering is used to melt snow, the surface layer itself retains heat, so the water to be sprinkled can be low-temperature, such as treated sewage water, and even if the atmospheric temperature is low, it is not necessary to spray water. Water is prevented from freezing on the road surface.

Example Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a schematic perspective view showing a part of a road to which the present invention is applied, and FIG. , heat storage body 4
It has a structure in which asphalt 5 is laid on the surface of the asphalt 5, and a heat insulating layer 6 mainly made of quarried stone or volcanic ash is provided below the surface layer 3, which also serves as a foundation. The heat storage body 4 is made of a material having high specific heat and thermal conductivity, specifically, for example, concrete, and has an air guide pipe 7 and a heat vibrator 8 buried therein. These air guide pipes 7 and heat vibes 8 are for heating the surface layer 3 and storing heat therein, and the air guide pipes 7 are for heating the surface layer 3 and storing heat therein.
As schematically shown in FIG. 3, one block consists of a plurality of vibrators 10 arranged parallel to each other between two vibrators serving as a header 9, forming a grid-like structure as a whole. One header 9 is connected to the main air pipe 11, and the other header 9 is connected to the main air exhaust pipe 12, and each block is buried so as to be substantially parallel to the road surface. Heat Vibe 8 also requires a wick to vacuum degas the air from the inside of the sealed vibrator, then fill it with a working fluid such as water or Freon that condenses and evaporates in the target temperature range, and to generate capillary pressure. The heat vibe 8 is placed between the vibes 10 arranged parallel to each other between the header 9 of the air guide pipe 7. It is arranged in a direction perpendicular to the header 9 (that is, a direction parallel to the header 9), and both ends thereof are inserted and connected to each vibrator 10 as shown in FIG. Note that since the heat vibe 8 is for transporting heat to a location where the air guide pipe 7 is not present, it is preferable that both ends of the heat vibe 8 be connected to the vibe 10. There is no particular problem with the configuration.

Here, the system for supplying and discharging hot air to and from the air guide pipe 7 is shown in FIG. There are two types of surplus heat sources 14 that generate surplus heat or waste heat, and each of these main heat sources 13 and surplus heat sources 1 has an operation controlled by a microcomputer based on an output signal from a snowfall/temperature sensor 15. It is connected to the blower 20 via the control panel 16.17 and the air blower 18.19.

The main air pipe 11 is connected to this air blower 20,
From here, hot air is supplied to the air guide pipes 7 of each block. The main exhaust WA pipe 12 may be configured to be connected to the main heat source 13 to circulate hot air, or if it does not cause any pollution problem, it may be connected to the main heat source 13 and discharged from the atmosphere from an appropriate exhaust pipe (not shown). May be released.

As shown in FIGS. 1 and 2, a snow-blowing vibrator 21 is buried in the widthwise center of the roadway 1 and in the roadside strip of the roadway 1. , water taps 22 that spray water toward the road surface are provided at regular intervals. Although not specifically shown, the snow clearing vibrator 21 is connected to an appropriate water supply source such as treated sewage water via a water pump.

Furthermore, snow melting grooves 23 are provided on the side edges of the sidewalk 2 to allow snow melting water to flow and to drop snow as needed.

Next, the operation of the above-mentioned device will be explained. In winter, when waste heat is generated in the surplus heat source 14, or when there is an output signal from the snowfall/temperature sensor 15 due to snowfall or a drop in temperature, the main heat source 13 Surplus heat source 14
from each air guide pipe 7 via the blower 20 and the main air pipe 11.
Hot air is sent to the The hot air is sent from the main air pipe 11 to the header 9 in the air guide pipe 7 of each block, and from there it is branched to each vibe 10, but even if there is a leak in the piping route between them, the piping Since the external pressure loss is large, hot air will not leak out, and naturally the surface layer 3 will not be eroded. By flowing hot air in this manner, the surface layer 3 is heated by heat radiation from the air guide pipe 7 and heat radiation via the heat vibrator 8, and heat is stored in the surface layer 3.

In that case, since the lower side of the surface layer 3 is the heat insulating layer 6, heat will not escape to other parts. In addition, the number of pipes 9 and 10 constituting the wind guide pipe 7 and the spacing between them are subject to restrictions in terms of workability and maintaining the strength of the road, and the burying density may be lowered. By providing the heat pipe 8, heat is applied to the portion where the air guide pipe 7 is not present by the heat vibrator 8, thereby heating and storing heat.

To explain more specifically, FIG. 5 shows the results of measuring the transition of the heat flux of the road surface at the middle part of the vibrator 10 constituting the conductor m@7 during heating. 8 (marked O in Fig. 5), the increase in heat flux is remarkable, and the absence of the pipe 10 is compensated for by the heat vibrator 8, and as a result, the entire surface layer 3 is almost evenly distributed. Efficient heating and heat storage are performed by heating and storing heat. The same goes for the case where the surface layer 3 is cooled by heat radiation, and the heat vibe 8 equalizes the temperature of the whole so as to correct uneven distribution of high temperature parts and low temperature parts.

When the outside temperature drops, the road surface is heated or kept warm by the heat possessed by the surface layer 3, thereby preventing water from freezing on the road surface. Furthermore, even if it snows, the snow that comes into contact with the road surface is heated and melted by the heat of the surface layer 3, and as a result, snow accumulation is prevented.

On the other hand, when snowfall temporarily increases and snow accumulates, water is spouted from the water tap 22 to remove snow by sprinkling water. In that case, the water sprayed on the road surface may melt the snow with its own heat, but other than that, it mainly
It fills the void between the road surface and the snow and promotes heat transfer from the road surface to the snow. Furthermore, although the temperature of the water decreases while flowing on the road surface toward the effluent groove 23, the water does not freeze because it receives heat from the surface layer 3 during this time. Therefore, with the above device, the water sprayed for snow removal does not need to be high-temperature water such as underground water, and wastewater such as treated sewage water can be used, so problems such as ground subsidence do not occur. , and the running cost can be reduced.

Furthermore, in the @ position described above, even when the amount of heat generated from each heat source 13 and 14 decreases at night and the outside temperature also decreases, the surface layer 3 stores heat, so it remains on the road surface. can prevent water from freezing.

In addition, when the heat storage body 4 is made of concrete, by making the air guide pipe 7 and the heat vibrator 8 metal, these can act as reinforcing reinforcing bars for the concrete, and the reinforcing bars commonly used in the past can also be abolished. . In addition to the above-mentioned concrete, bricks,
Tile, Oya stone, asphalt, heated asphalt concrete pavement, room temperature asphalt concrete, concrete block slab, interlocking block pavement, etc. can be used.

In the embodiment described above, the wind guide pipe 7 was configured in a grid shape.
The present invention is not limited to the above-described embodiment, and the air guide pipe 7 may be arranged so as to satisfy practical requirements such as workability and pressure loss. Further, the heat insulating layer 6 may not be used as the base portion below the surface layer 3, but may be specially formed using another special material.

Furthermore, in the above embodiment, heat is transported between the air guide pipes using a heat vibrator, but in this invention, a blower pipe is used instead of the heat vibrator, and the heat is transported between the air guide pipes. It may also be configured so that heat is carried in the direction of the air flow.

As described in detail, according to the present invention, since the surface layer is formed of a heat storage material, the amount of heat generated at the heat source is reduced,
At the same time, freezing can be reliably prevented even when the outside temperature drops, and when used together with snow-melting water, it is possible to prevent the sprayed water from freezing, and also to prevent the sprayed water from freezing. This means that low-temperature and inexpensive water can be used, which reduces the need for pumping up conventional groundwater and solves problems such as ground subsidence. Furthermore, since this invention uses hot air as a means of transporting heat, there is no risk of erosion of the roadbed even if there is a leak in the middle of the piping, and therefore the piping for hot air can be simplified. At the same time, since surplus heat sources can be used, running costs can be reduced. Furthermore, in this invention,
Since the structure uses heat pipes in conjunction with air guide pipes, even if the installation density of air guide pipes is lowered, the beat pipes can efficiently transport heat to areas where there are no air guide pipes, allowing heating and heating. Because it stores heat, it is difficult to conduct heat! ! In addition to making the construction of the surface layer easier, the entire surface layer stores heat almost evenly, making it possible to increase heat storage efficiency.

On the other hand, if a heat insulating layer is provided below the surface layer, the heat applied by the warm air will not escape to the deep part, so snow melting and freezing prevention can be performed more effectively.

Furthermore, when snow melting water is used in combination, heat transfer from the surface layer to the snow is promoted, and freezing of the sprayed water is prevented by the heat from the surface layer, so the sprayed water has a particularly high temperature. As a result, low-temperature and inexpensive water such as treated sewage water can be used, so running costs can be kept low in this respect as well.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view schematically showing a part of a road to which the present invention is applied, FIG. 2 is a sectional view of the road, and FIG.
Figure 4 is a schematic diagram of a system for supplying hot air, Figure 4 is a partial sectional view showing an example of heat pipe installation, and Figure 5 shows the results of measuring the heat flux on the road surface in the area between the air guide pipes. This is a graph showing. 3...Surface layer, 4...Heat storage body, 6...Insulating layer, 7...Air guide pipe, 8...Heat pipe, 9
...Header, 10...Pipe, 13...Main heat source, 14...Surplus heat source, 22...Water faucet.

Claims (4)

[Claims] (1) The surface layer of the road is formed by a heat storage body, and inside the surface layer, an air guide tube that flows hot air sent from a heating source is buried almost parallel to the road surface, and 1. A road surface snow removal and antifreeze device, characterized in that a pipe or an air duct is embedded in the surface layer in a direction intersecting the air duct while being connected to the air duct. (2) The road surface snow removal and antifreeze device according to claim 1, wherein a heat insulating layer is provided under the air guide pipe and the heat pipe or the blower pipe. (3) A plurality of the air guide tubes are buried in the surface layer so as to be parallel to each other, and the heat pipes or the blower tubes are connected to adjacent air guide tubes. The road surface snow removal and anti-icing device according to claim 1. (4) The road surface snow removal and anti-icing device according to claim 1, further comprising a water spraying means for spraying water onto the road surface.