JPH0571103A - Road heating system - Google Patents

Abstract

PURPOSE:To prevent a wall of a snow cover layer from being generated in a boundary portion between a heating area and a non-heating area of a road. CONSTITUTION:A pipe 23 for circulating a heat medium is buried under the road surface of a heating area A of a road 21. Return headers 25a, 25b are disposed in such a manner as to be shifted to the non-heating area B side more than outgoing headers 24a, 24b. On the terminal portion C side in the direction of road length of the road 21 in the heating area A. The heating temperature for the road surface of a heating medium circulated through pipes 23 on the terminal C side is made lower than that of the other portions of the heating area A so that a boundary portion between the heating area A and the non- heating area has a gentle distribution of temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which one or more pipes are buried under a road surface, and a heating medium such as hot water or antifreeze is circulated in the pipes to heat the road surface to prevent snow and freezing. The present invention relates to a road heating system that prevents such problems.

[0002]

2. Description of the Related Art Recently, on roads in cold regions,
In order to prevent or thaw snow, freezing, etc. on the road surface, one or more pipes are buried under the road surface, and a heat medium such as hot water or antifreeze is circulated in the pipe, and the road surface is heated by this heat medium. Construction is being carried out using a warm road heating system.

In the road heating system, for example, (a) as shown in FIG. 5 (a), one pipe 2 is enlarged in a zigzag shape in the length direction or the width direction of the road 1. The pipe 2 is arranged in a meandering manner, and one end of the pipe 2 is connected to the heat medium passage pipe 3
In addition, the other end is connected to the heat medium return pipe 4, and the heat medium is circulated in the pipe 2.

(B) As shown in FIG. 5 (b), two or more pipes 5 and 6 are aligned in a meandering manner in the lengthwise or widthwise direction of the road 1 and arranged in a meandering manner. One end is connected to the heat medium return pipe 7, the other end is connected to the heat medium return pipe 8, and one end of the other pipe 6 is connected to the heat medium return pipe 8 and the other end is connected to the heat medium return pipe 7. The heat mediums flowing through the adjacent pipes 5 and 6 are arranged so that the flowing directions thereof are opposite to each other.

(C) As shown in FIG. 5 (c), a large number of U-shaped pipes 9 ... Are arranged in the lengthwise or widthwise direction of the road 1, and these pipes 9 ... .. one end of which is connected to the heat medium upstream pipe 10 and the other end of which is connected to the heat medium return pipe 11 so that the heat mediums flowing through the adjacent pipes 9 ... What you have configured. and so on.

As shown in FIG. 6, the heat medium feed pipes 3, 7, 10 are connected to the supply side of the heat medium supply device 12, and the heat medium return pipes 4, 8, 11 are connected to the heat medium supply device. 1
2 is connected to the receiving side to circulate a heat medium to heat the road surface.

The heat medium supply device 12 usually includes a hot water boiler 13 and a liquid feed pump 14, and a heat medium such as heated water or antifreeze liquid is forcedly circulated by the pump to heat the road surface to heat the road surface. It prevents snowfall and freezing, and melts snowfall and freezing.

By the way, in the conventional road heating system, the road region (pipes to be heated) desired to be heated can be obtained by any of the above-mentioned (a), (b) and (c) piping systems and other piping systems. The road area of the installed part (hereinafter referred to as the heating area) is uniformly and effectively heated as much as possible and pipes are evenly and evenly arranged below the road surface in the heating area in order to simplify pipe piping. However, the heating action of the heat medium is uniformly applied to the road surface over the entire heating region, so that the snow on the road surface can be completely prevented from freezing. That is, specifically, when arranging a pipe,
The ends of the pipes arranged in the lengthwise direction of the road were arranged so that they were generally aligned in a horizontal direction.

However, in the piping system as described above, the heated region and the non-heated region are distinctly divided. In other words, the road is infinitely long, and it is financially difficult to use a road as a road with road heating throughout its length. Therefore, only a certain section of the road has to be a road with road heating. However, with the pipe as described above, the heating region A and the non-heating region B are clearly divided as shown in FIG. 7.

Therefore, in the heavy snow area, even on the same road, although there is no snow in the warming area A, as soon as the end of the warming area A has passed, the number of non-warming areas B increases. There was a phenomenon that a snowfall C of 10 cm was formed, and so to speak, a wall was formed by a snow layer in the width direction of the road to cause a large step, and a passing vehicle caused an accident due to the step.

The present invention has been made in view of the above circumstances, and an object thereof is to warm the road surface heating temperature by the heat medium flowing in the pipe to the terminal end side of the heating region. A lower area than the rest of the area is provided, so that the boundary between the heated area and the non-heated area does not have a large step due to the snow layer as described above, so to speak, the snow is gradually added at the boundary. It is to provide a load heating system that can be deepened.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is a road heater in which a pipe is buried under a road surface in a heating region of a road and a heat medium is circulated in the pipe to heat the road surface. In the heating system, by means such as providing a return header for returning the heat medium circulating in the pipe to the end portion side in the path length direction of the heating region,
The purpose is to provide an area where the heating temperature of the road surface is lower than that of other parts of the heating area.

[0013]

[Function] When the heat medium is supplied from the heat medium supply source to the pipe, the heat medium flows through the pipe to heat the road surface in the heating region to prevent snow and freezing on the road surface, and to prevent snow and freezing. To thaw. On the terminal side of the heating region, a return header connected to a pipe through which a heat medium whose temperature has decreased by flowing through the pipe flows is arranged, so that the heating temperature of the road surface becomes low. As a result, a small amount of snow, etc. remains at the end of the warming region, and a large step due to snow does not occur at the boundary between the warming region and the non-warming region, so to speak, there is a gentle temperature distribution at the boundary. Then the snowfall gradually deepens.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment, in which 21 is a road having a road surface 22 paved with concrete or asphalt, and a predetermined interval is provided in the width direction of the road 21 below the road surface in the heating area A. A large number of pipes 23 are buried in parallel with each other and in the length direction of the road 21.

The pipe 23 is made of a synthetic resin pipe such as a nylon pipe or a metal pipe having pressure resistance and corrosion resistance for circulating a heat medium. And these pipes 23 are at the same time as the pavement work of the road surface 22,
It is buried 3 to 30 cm below the road surface.

Forward headers 24a and 24b and return headers 25a and 25b are respectively provided under the road surface located at both ends of the plurality of pipes 23 arranged on the road 21 in a direction traversing the road 21. It is buried. That is,
An outgoing header 24a is provided on one end side of the many pipes 23 ...
The header 2 for going outward from the extension direction of the pipe 23
A return header 25a is provided separately from the 4a. Similarly, a forward header 24b is arranged on the other end side of the many pipes 23 ... And the forward header 24b is located outside the forward header 24b in the extension direction of the pipe 23.
A return header 25b is provided separately from the.

Then, every other pipe 23 ...
One end thereof is connected to the forward header 24a at a predetermined interval, and the other end thereof is connected to the return header 25b at a position spaced apart from the forward header 24b at a predetermined interval. Also, each of the remaining pipes 23 ... (Therefore, every other pipe 23 ... every other pipe)
Has its one end connected to the forward header 24b at a predetermined interval, and the other end beyond the forward header 24a and connected to the return header 25a at a predetermined interval.

The return headers 25a and 25b are connected via a heat medium return pipe 27 to an inlet 29 of a boiler 28 as a heat medium supply source. The forward header 2
4a and 24b are connected to a discharge port 32 of a pump 31 via a heat medium outflow pipe 30, and a suction port 33 of this pump 31 is connected to an outlet 34 of a boiler 28.

Therefore, when the pump 31 is driven, a heat medium such as hot water is sucked from the boiler 28, and the discharge port 3
A heat medium is supplied from 2 to the heat medium outgoing pipe 30, and this heat medium flows through a large number of pipes 23 disposed under the road surface through the forward headers 24a and 24b, and returns to the header. Boiler 2 via 25a, 25b and return pipe 27
Return to 8.

In this case, a large number of pipes 23 ... Are arranged in parallel with each other, and one end portion on the right side is alternately connected to the forward header 24a and the return header 25a, and every other pipe is alternately connected to the left side. Since the other end of each is alternately connected to the return header 25b and the outgoing header 24b, every other pipe 23 adjacent to each other in the area between the outgoing headers 24a and 24b in the heating region A is replaced. The flow direction of the heat medium flowing in the reverse direction is reversed, and the road surface 22 in this area is uniformly heated throughout.

On the other hand, the area between the forward header 24a and the return header 25a at the end portion C of the warming zone A (the portion on the boundary side with the non-warming zone B), and the forward header 2
In the area between 4b and the return header 25b, the heat medium flows through the pipes 23 ... In one direction only toward the return headers 25a and 25b.

Therefore, the end portion C of the heating area A is located on the downstream side of the heat medium flowing through the pipe 23, and the temperature of the heat medium is also lowered, and the other portion of the heating area A, that is, the forward header 24a. As a result, the heating temperature of the road surface by the heat medium is lower than that of the area between 24b and 24b, the arrangement density of the pipes 23 is inevitably coarse, and the ability to heat the road surface 22 is also lowered.

As a result, with respect to the road 21 in the heating area A, it is possible to prevent snow and freezing on the road surface 22 as a whole,
A road surface heating system can be constructed to thaw snow and freezing. However, at the terminal end portion C of the heating region A, the heating temperature of the road surface due to the heat medium flowing through the pipe 23 becomes low, and the ability to heat the road surface 22 also decreases, so snow melting or the like at the terminal end portion C becomes insufficient. At the boundary between the heated region A and the non-heated region B, the temperature distribution becomes gentle and the snow 26 gradually deepens, so that a large step is not generated.

FIG. 3 shows a second embodiment. In this embodiment, a large number of pipes 23 are arranged in parallel with each other by bending (folding into two) a U-shape at a substantially middle portion in the longitudinal direction.
A first pipe group R and a second pipe group L each of which are embedded in the road length direction under the road surface of the heating region A so that the U-shaped portions 23a of the pipe 23 are abutted against each other. Is.

.. of the first pipe group R are connected to the forward header 24a, and the other end thereof is connected to the return header 25a which is arranged apart from the forward header 24a. Has been done. Similarly, one end of each of the pipes 23 of the second pipe group L is connected to the forward header 24b,
The other end is connected to a return header 25b which is arranged apart from the forward header 24b.

Therefore, in the heating region A between the forward header 24a of the first pipe group R and the forward header 24b of the second pipe group L, the heat medium flowing in the adjacent pipes 23 ... Alternately, the heat medium flows between the forward header 24a and the return header 25a of the first pipe group R and between the forward header 24b and the return header 25b of the second pipe group L. The directions are the same, and the road surface 22 in the heating area A can be heated.

As a result, on the road 21 in the cold region, the road surface heating system can be constructed so as to prevent snow and freezing on the road surface 22 in the heating region A as a whole or to melt the snow and freezing. However, the end portion C of the heating region A is on the downstream side of the heat medium flowing in the pipe 23, and the temperature of the heat medium also becomes lower, so that the road surface 22 is heated by the heat medium more than other parts of the heating region A. Since the temperature decreases, the ability to heat the road surface 22 also decreases. Therefore, snow melting or the like at the terminal end portion C becomes insufficient, and a gentle temperature distribution is formed at the boundary portion between the heated region A and the non-heated region B, and the snow cover 26 gradually deepens, and a large step due to the snow cover 26 does not occur. ..

According to the first and second embodiments, one end of the pipe 23 is connected to the forward headers 24a and 24b,
The other end is connected to the return pipes 25a and 25b to form a piping unit, and when the pipe unit is laid under the road surface, the return headers 25a and 25b are simply used for the forward header 2
It suffices to lay it closer to the non-heating region B side than 4a and 24b, the piping is simple, and unitization is possible, so that on-site work can be completed in a short time.

If a pipe made of a flexible material that can be wound around a drum or the like is used as the pipe 23, the entire piping unit can be rolled and transported, so that it is unitized at the factory and simply at the site. The return headers 25a and 25b may be arranged so as to be offset from the forward headers 24a and 24b to the non-heating region B side, and the construction is easy.

According to the first and second embodiments,
Although the heat mediums flowing through the pipes 23 are arranged so that the circulation directions thereof are opposite to each other, they may be arranged such that every two or a plurality of heat mediums are oppositely arranged. further,
As shown in FIG. 4, two pipes 35 are used, and one pipe 35 a of the two pipes 35 is connected to the forward header 24.
b, the other pipe 35b is connected to the return header 25b.
The heat medium flowing through the pipes 35a and 35b may be connected in the opposite direction.

[0031]

As described above, according to the present invention, a pipe for circulating a heat medium is buried under the road surface in the heating area of the road, and the heating area is provided on the terminal end side in the path length direction.
Since the area where the heating temperature of the road surface by the heat medium flowing in the pipe is lower than the other parts of the heating area is provided, the boundary between the heating area and the non-heating area has a gentle temperature distribution. Therefore, it is possible to clearly distinguish the presence or absence of the effect of thawing snow and freezing, and to prevent the formation of a snow layer wall at the boundary, and the behavior when the vehicle moves from the warming area to the non-heating area. It has the effect of smoothing and preventing the occurrence of slip accidents and the like.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a load heating system according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view taken along the line aa in FIG.

FIG. 3 is a configuration diagram of a load heating system according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a modified example of the pipe of the present invention.

FIG. 5 is a configuration diagram of a conventional road heating system.

FIG. 6 is an overall configuration diagram of a conventional load heating system.

FIG. 7 is a vertical sectional side view of a part of the conventional road heating system.

[Explanation of symbols]

 21 road 22 road surface 23 pipe A heating area B non-heating area C end part

Claims (2)

[Claims] 1. One or two under the road surface in the heating region of the road
In a load heating system in which two or more pipes are embedded and a heating medium is circulated in these pipes to heat a road surface, a heating medium flowing in the pipe is provided at a terminal end side in the path length direction of the heating region. The road heating system is characterized in that an area in which the heating temperature of the road surface is lower than that of other parts of the heating area is provided. 2. The load heating system according to claim 1, wherein a return header for returning the heat medium flowing through the pipe is provided on the end side of the heating region.