JPH0444507A - Boundary indication pile of road - Google Patents

Abstract

PURPOSE:To reduce influence of the pressure of snow accumulated on a road marginal strip, etc. upon a boundary indication pile by placing the end of a heat pipe in the ground to make it as an evaporation section, and making an indication section extended on the ground as a condensation section to maintain a snow-melting operation. CONSTITUTION:In a boundary indication pile 11, the inside of a steel pipe is hollowed, and condensed hydraulic fluid F is enclosed in the inside thereof to have it perform a heat pipe function. After that, a lower evaporation section 11a is inserted into a hole bored in a boundary section B between a roadway R and a road marginal strip E so that it is approximately vertical. When snow S is piled up on the road marginal strip E, in an indication section 11b of the boundary indication pile 11, heat gathered from the underground is radiated. At that time, the snow S in a part brought into contact with the indication section 11b or near thereto is melted to form a hollow H around the indication section 11b. Accordingly, it is hard to influence the boundary indication pile by pressure of the snow S, and destruction or damage, etc., caused by pressure of the snow S can be prevented.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention is intended for use in a field of industrial application,
This relates to road boundary marking stakes that serve as landmarks when driving vehicles or during snow removal work.

Conventional technology In regions with heavy snowfall, when the road surface is covered with snow, boundary marking stakes are erected at the boundary of the road, such as the border between the driveway and the sidewalk or roadside strip, and these marking stakes are It is used as a landmark when vehicles are driving or when snow plows are removing snow. This boundary marking stake is generally a metal pole whose surface is painted red and white alternately, and as shown in Figure 7, this boundary marking stake 1 is used to mark roads during the snowy season. These holes are installed vertically at intervals of approximately 10 to 50 meters by inserting their lower parts into holes drilled at the boundary B between the roadway R and the roadside strip E, and are extended to the ground surface when snowfall increases. Red and white display section 1a
In addition to displaying the road boundaries and indicating the direction in which the road continues, the red and white coating on the display section 1a also makes it possible to know the approximate amount of snowfall.

Problems to be Solved by the Invention When the above-mentioned conventional boundary display stake 1 is erected, for example, at the boundary B between the roadway R and the roadside belt E, the snow removal range when snow removal is performed by a snowplow vehicle is limited. It is often used as a target for determining the Further, in many cases, snow S removed from the road surface by a snowplow is deposited on a roadside strip E beside the road, and is melted by natural heat such as air temperature or solar heat.

Therefore, when there is a large amount of snow or when snowfall continues for a long time, the removed snow S is often piled up on top of the unmelted snow remaining on the roadside strip E, resulting in a high accumulation. In such a case, the boundary marking stake 1 may tilt due to the pressure of the lightning S accumulated on the roadside strip E and become buried in the accumulated snow S, making it unable to perform its display function, or it may fall and fall onto the road R side. There were problems such as protruding and blocking the passage of vehicles, or bending in the middle and making it unusable.

This invention was made in view of the above circumstances, and an object of the present invention is to provide a road boundary marking stake that is less susceptible to the influence of the pressure of snow that accumulates on roadside strips and the like.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention provides a method of sealing a condensable working fluid in a evacuated metal tube in a road boundary marking stake erected at the boundary of a road in a snow-covered area. The heat pipe is characterized in that one end of the heat pipe is placed underground to serve as an evaporation section, and the display section extending above the ground serves as a condensation section to maintain snow melting action.

Further, the evaporation part of the heat pipe may be immersed in an antifreeze liquid in a container provided underground. moreover,
The evaporation section of the heat pipe may have its upper end disposed near the ground surface, and may be removably fitted without a gap into the inside of a double-tube type hollow heat pipe that is buried deep underground.

Function By configuring as described above, the road boundary marking stakes erected at the boundaries of roads in snow-covered areas are used as heat pipes, and one end that becomes the evaporation part is placed underground, while the other end extends above the ground. The display section acts as a condensing section, transporting heat absorbed from underground to the display section and dissipating it, melting the snow around the display section. Therefore, as a result of constant snow melting around the above-ground part of the boundary marking stake, a cavity is formed, and even if snow removed from the road is piled up on the roadside, the pressure of the accumulated snow will cause the boundary marking stake to No more falling or breaking.

In addition, if the lower part (evaporation part) of the boundary marking pile is immersed in an antifreeze liquid such as antifreeze or water in a container installed underground,
Since there is no gap around the evaporation part and the evaporation part is in close contact with the liquid that is the heat medium, the heat transfer efficiency is improved. Furthermore, since heat is absorbed by the evaporator, the temperature of the liquid as a heat medium is always lower than the temperature of the surrounding soil, but heat is replenished from the surrounding soil to compensate for the drop in temperature. Therefore,
Heat collection efficiency can be further improved by increasing the diameter of steel pipes, concrete pipes, etc. and increasing the surface area.

In addition, a double-tube type hollow heat pipe is buried so that its upper end is located near the ground surface, and the evaporation part at the bottom of the boundary marking pile that has a heat pipe function is inserted into the hollow heat pipe without any gaps. If the stakes are removably fitted, the boundary marking stakes can be easily removed when not in use, except in winter.
It will also be easier to install during the snowy season.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 6.

FIG. 1 shows a first embodiment of the present invention, in which a boundary marking pile 11 is used to evacuate the inside of a steel pipe and use a condensable working fluid F.
By enclosing it inside, it has a heat pipe function.

This boundary marking pile 11 with a heat pipe function is intended to transport underground heat to the ground for use, and the lower evaporation part 11a is drilled into the boundary part B of the road between the carriageway R and the roadside strip E. It is inserted into the provided hole and is provided almost vertically. The portion of the boundary display stake 11 extending above the ground is a display section 11b serving as a condensation section, and its surface is painted with red and white paint alternately at regular intervals.

Therefore, the boundary display pile 11 with a heat pipe function
In the evaporation section 11a, the heated working fluid F absorbs underground heat and evaporates, and the vapor moves to the condensation section 11b, releases the carried heat as latent heat of vaporization, and condenses, forming a liquid phase. The working fluid F that has returned to the evaporator section 11a flows back to the lower evaporator section 11a and is heated again, repeating the cycle to melt snow and ice that have adhered to or come into contact with the display section 11b, which is the condensation section, or snow accumulated in the vicinity. It is supposed to be done.

Next, the operation of this embodiment will be explained.

The boundary display stake 11 is inserted into a hole drilled in a boundary portion B between the roadway R and the roadside belt E of the road, and is provided almost vertically. When snow S removed from the roadway R by a snowplow during snowfall is piled up high on the roadside E, heat collected from underground is released in the display section 11b of the boundary display stake 11 equipped with a heat pipe function. Therefore, the display section 11
The snow S that is in contact with or in close proximity to the display part 11b is melted, and a cavity H is formed around the display part 11b.

Therefore, the snow S accumulated on the roadside belt E flows, although slowly, so that if the accumulated snow S flows, for example, in the direction of the roadway R, it approaches or contacts the boundary marking stake 11 and melts one by one. As a result, a cavity H is formed around the boundary display pile 11, so that the boundary display pile 11 is not pushed down by the pressure of snow.

Further, FIGS. 2 and 3 show a second embodiment of the present invention, in which an evaporator section 21a buried underground is used in a boundary display pile 21 having a heat pipe function similar to that of the first embodiment. Six heat collecting fins 22 are arranged radially (third
(see figure).

Therefore, when this boundary display pile 21 is buried/installed in the ground with the evaporation part 21a side equipped with heat collecting fins,
Each heat collecting fin 22 provided radially absorbs heat efficiently from the surrounding soil and heats the working fluid in the evaporator 21a, so the heat transport efficiency by the vapor of the evaporated working fluid is improved, and the boundary marking The snow melting ability of the pile 21 can be increased.

As a result, the portion of the boundary display stake 21 that extends to the ground surface is
Even if buried in snow accumulated on a roadside strip or the like, a cavity is formed by melting the surrounding snow, and breakage or collapse of the boundary marking pile 21 due to snow pressure can be effectively prevented.

Further, FIG. 4 shows a third embodiment of the present invention, in which a boundary indicating stake 31 with a heat pipe function has its lower evaporation part 31a located at a boundary part B between the carriageway R and the roadside strip E of the road. The lid body 32 is buried and immersed in a steel pipe container 32 filled with a liquid heat medium W such as water, and the display part 31b, which is the condensation part, is closed off to the container 32.
It penetrates through a and extends above the ground.

Therefore, in this way, the evaporation part 31a of the boundary display pile 31
By immersing the evaporator in a liquid heat medium W such as water, a gap is created between the evaporator 31a and the surrounding soil, as in the case where the evaporator 31a is inserted into a hole drilled in the road surface, resulting in efficient heat transfer. There will be no problems such as not being carried out. Therefore, the heat of the surrounding soil is collected into the heat medium W through the steel pipe 32, and this heat medium W comes into close contact with the evaporation part 31a, and transfers heat reliably and efficiently, increasing the snow melting ability of the boundary marking pile 31. can be increased. In addition, the heat medium W in the container 32 is deprived of heat by the boundary display stake 31 in which the evaporator 31a is immersed, and its temperature decreases. heat is supplied from the soil. As a result, even if the portion of the boundary display stake 31 extending to the ground surface is buried by snow accumulated on the road side strip, etc., the snow around the display section 31b will melt and a cavity will be formed, and the pressure of the snow will Breakage, collapse, etc. can be effectively prevented.

Furthermore, FIG. 5 shows a fourth embodiment of the present invention.
The boundary display pile 41 with a heat pipe function is installed with its lower evaporator section 41a placed underground, and its upper display section 41b extended above the ground. The outer periphery of the portion of the portion 41H close to the ground surface is covered by a heat insulating covering material 42 to a predetermined depth from the ground surface, and the range covered by this heat insulating covering material 42! is set to about 0.2 to 1 m depending on the outside temperature and the like.

Therefore, the buried evaporation part 41a of the boundary display pile 41
Since the part near the ground surface is covered with the heat insulating coating material 42, wasteful heat radiation is prevented even if the soil near the ground surface is cooled by snowfall or outside air during the snowy season.
Heat can be transported to the display section 41b on the ground to efficiently melt snow.

As a result, the portion of the boundary display stake 41 that extends to the ground surface is
Even if the display section 41b is buried by snow accumulated on the roadside belt E etc., the snow around the display section 41b is melted to form a cavity, and breakage or collapse due to snow pressure can be effectively prevented.

Further, FIG. 6 shows a fifth embodiment of the present invention, in which a boundary display stake 51 having a heat pipe function is placed at a boundary part B between the roadway R and the roadside belt E, with the upper end almost touching the ground surface. A lower evaporation section 51a is placed in the hollow part inside the hollow heat pipe 52 buried at a predetermined position so as to be at the same height.
It can be inserted and inserted removably without any gaps. This hollow heat pipe 52 seals a space between two tubes, an inner tube and an outer tube, and after evacuating the inside, seals a condensable working fluid F therein, and A wick 53 is provided on the inner circumferential surface of the outer tube, and the outer circumferential surface of the outer tube becomes the evaporating section 52a, while the inner circumferential surface of the inner tube becomes the condensing section 52b.

When the hollow heat pipe 52 absorbs heat from the soil around the buried location, the working fluid F drawn up throughout the evaporation section 52a is heated by the capillary action of the wick 53, and becomes vapor. The working fluid F moves to the condensing section 52b on the opposing surface, dissipates the carried latent heat of vaporization and condenses, and returns to the liquid phase.The working fluid F flows downward along the pipe wall of the condensing section 52b and accumulates at the end. By the capillary action of the wick 53, the liquid is sucked up to the surface of the evaporating section 52B and heated again, and the cycle is repeated.

On the other hand, the boundary display pile 51 having a heat pipe function has a lower evaporation section 51 inside the hollow heat pipe 52 described above.
A can be inserted without any gaps to allow heat transfer, and can be removed during seasons other than the snowy season.

Therefore, when the snow season arrives, the hollow heat pipe 52
Remove the cover or cap (not shown) and insert the
When the evaporator section 51a of the boundary display pile 51 is inserted, the evaporator section 51a comes into close contact with the inside of the condensation section 52b of the hollow heat pipe 52. As a result, the hollow heat pipe 52 absorbs heat from the surrounding soil and releases a large amount of heat in the condensing part 52b, so the evaporating part 51a of the boundary marking pile 51 is heated and the vapor of the working fluid F is released in the condensing part. It is possible to efficiently melt snow by transporting heat to a certain display section 51b and releasing a large amount of the transported latent heat of vaporization.

As a result, the portion of the boundary display stake 51 that extends to the ground surface is
Even if the display part 51b is buried by snow accumulated on the roadside strip E etc., the snow around the display part 51b is melted to form a cavity, and breakage or collapse due to snow pressure can be effectively prevented.

Further, when the snow season ends, the boundary display stake 51 can be easily pulled out and removed from the hollow heat pipe 52,
It is stored until the next time it is used, and the hollow heat pipe 52 is covered with a lid or cover.

As explained above, the road boundary marking stake of this invention has the following effects:
The road boundary display stakes erected at the boundaries of roads in snowy areas are equipped with a heat pipe function so that the above-ground display section melts snow, etc., thereby reducing the pressure of snow accumulating on roadside strips, etc. It is possible to prevent boundary marking piles from collapsing or breaking due to the pressure of snow.

[Brief explanation of drawings]

1 to 6 show embodiments of this invention,
FIG. 1 is a schematic explanatory diagram showing the state in which the boundary display stake of the first embodiment is used, and FIGS. 2 and 3 show the boundary display stake of the second embodiment. An explanatory diagram showing the underground part of the display pile, Figure 3 is a cross-sectional view along the ■-■ line in Figure 2, and Figure 4
The figure is a schematic explanatory diagram showing the boundary display stake of the third embodiment, FIG. 5 is a schematic explanatory diagram showing the boundary display stake of the fourth embodiment, and FIG. 7 are diagrams showing a conventional example. 11.21.31.41.51... Boundary display stake, 11
a, 21a, 31a, 41a, 51a... evaporation section,
llb, 31b, 41b, 51b... Display section (condensation section), 22... Heat collection fin, 32... Container, 42
...Insulating coating material, 52...Hollow heat pipe, 5
3...Wick, F...Hydraulic fluid, E...Roadside belt, R...Roadway, B...Boundary part, S...Snow, H...Cavity, W...Water etc. heat medium.

Claims (3)

[Claims] (1) For road boundary marking stakes erected at road boundaries in snow-covered areas, a heat pipe containing a condensable working fluid in a evacuated metal tube is placed underground with one end to create an evaporation section. A road boundary display pile characterized in that the display section extending above the ground serves as a condensation section to maintain snow melting action. (2) The evaporation part of the heat pipe is immersed in an antifreeze liquid in a container made of a material with high thermal conductivity and placed underground. Road boundary marking stakes. (3) The road according to claim 1, wherein the evaporation part of the heat pipe is removably fitted inside a double-tube type hollow heat pipe buried underground. Boundary marking stake.