JPS635521B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pipe device that is reversibly used for energy dissipation and absorption, and in particular, it is installed under the road surface and in cold seasons (low temperature with snowfall), underground water is passed through the pipe to melt snow. In addition to preventing freezing, the waste water is returned to the underground through a return well, and during warm seasons (high temperatures with plenty of solar heat), it is used as a heat collector to raise the temperature of the water flowing through it by the solar heat absorbed by the road surface. This invention relates to a reversible pipe device in which the hot water is passed through water utilization equipment and surplus hot water is also returned underground from the above-mentioned well.

Conventionally, groundwater water sprinkling methods have been used to remove snow from roads in snowy areas, but since the water was directly discharged into rivers, water resources were wasted and rivers were polluted. In some cases, ground subsidence occurred due to the use of groundwater, and running water on the road surface was as unpleasant as snowfall, especially for pedestrians.

This invention aims to eliminate the above-mentioned drawbacks,
A continuous conduit is installed in the roadbed consisting of the upper and lower layers of the road foundation, and groundwater is supplied into this conduit from the entrance, and after flowing through the conduit, the drainage end is not on the road surface. Waste water is taken out from the outlet and returned to the groundwater vein through a return well that is the return end to the water supply source connected to the outlet.During snowfall or when the road surface temperature is lower than the water temperature, When there is a risk of freezing, the thermal energy of groundwater is used to melt snow or prevent freezing. Also, when there is no snowfall or freezing, the solar heat that heats the roadbed is absorbed and collected into the groundwater flowing through the pipes. By connecting the outlet of the pipe and the water supply end of the water-flowing equipment, hot water is supplied to the water-flowing equipment for use as a heating device, and the surplus wastewater is disposed of. This also provides a reversible pipe device that returns the water underground in the same manner as above.

The invention will now be described with reference to illustrative embodiments.

FIG. 1 is a cross-sectional view of a road with a multilayer structure, and FIG. 2 is a plan view showing a pipeline with only the upper layer removed.
As shown in FIG. 1, when a roadbed consisting of an upper layer 4, a lower layer 5, etc. is provided on a road base 3, a conduit 2 is laid within this roadbed, preferably within the upper layer 4 as shown in the figure. Although not limited to the illustrated embodiment, as shown in FIG. 2, the pipe line 2 is provided continuously,
Groundwater is allowed to flow into the pipe 2 from the pipe inlet 6. The groundwater that has passed through the pipe 2 exits the pipe at the outlet 7, which is the discharge end of the water flow, and then enters the groundwater vein through the end of the return flow path connected to the outlet 7, which connects to the water supply source. will be returned.

Although FIG. 1 shows a general multi-layer structure, if construction is to be simplified, a single-layer structure with fewer steps can be used.

As described above, when the temperature of the road surface 1 is low, groundwater whose temperature is higher than this can be passed through the conduit, and the energy of the groundwater can be used to melt snow or prevent freezing. During warm weather, when the temperature of the road surface 1 is higher than the temperature of the groundwater in the pipe line 2 due to solar heat, etc., the pipe device of the present invention is used as a heat collector that heats the groundwater with solar heat. In either case, the wastewater is returned underground unless it is specifically used.

Figure 3 shows that a mesh 8 with good heat absorption and exhaust efficiency is provided in contact with the upper surface of the conduit 2 to increase the strength of the conduit 2, improve heat radiation and absorption efficiency from the conduit 2, and average the temperature distribution. In addition, the mesh 8 can be replaced with a linear member that intersects with the pipe line and has the same effect. Furthermore, although the cross section of the conduit 2 is square, this is merely to show that it does not have to be circular as shown in FIG. Of course,
Shapes other than circles and squares may be used. The plan view of FIG. 4 shows the case where the pipe line 2 is divided into a plurality of sections,
An example of piping is shown in which water flows from an inlet 6 and an outlet 7 to branch pipes of each section via main pipes 9 and 10.

In the case of a multilayer structure, the material and processing method for each layer are changed to improve overall performance. The upper layer near the road surface,
It is constructed using a material with higher thermal conductivity than other layers, increasing the efficiency of both snow melting and solar energy utilization. Furthermore, in order to achieve the same effect, except in cases where strength is given priority such as when heavy vehicles are passing, pedestrian bridges, terraces, sidewalks, etc. should be constructed with concrete, asphalt, etc., even if the strength is inferior to concrete, asphalt, etc., especially for the middle and lower floors. Use commonly used insulation materials.

For applications where road surface strength and abrasion resistance are not strongly required, the thickness of the upper layer is made thinner, the surface is made into a film-like structure, and in an extreme case, the upper surface of the conduit is exposed.

In order to increase the road surface temperature and increase the efficiency of heat utilization, the surface or surface layer of light-colored materials (such as concrete) is treated to be black or dark-colored. For applications with a low degree of wear, a highly transparent material is processed into a membrane to prevent heat dissipation from the surface.For this purpose, a material with selective absorption or selective transmission characteristics is used, and It can be effective.

When snow is melted using groundwater, the cold water flowing out from outlet 7 is not discharged, but outlet 7 is connected to the end of a return path connected to a return well that leads underground, which is the water supply source. The outflowing cold water is then returned to the well for return (not shown), and when using solar heat, the hot water from outlet 7 is sent to the water supply end of the water-flowing equipment that is used directly as described above. If you use it by connecting it directly or by connecting it through a tank and use it after storing it, and if you can obtain hot water beyond your immediate needs, use the excess hot water as in the case of cold water above. , the outlet 7 and the end of the reflux path are connected to return the water to the well for reduction.

The effect of the pipe device of this invention is easy to understand when compared with conventional electric road heaters, namely, the thermal conductivity of the portion close to the road surface is 0.01 J/cm. S.
K., the depth of the conduit is 5 to 7 cm, and the average water temperature is 8 to 9°C, this corresponds to a road heater of approximately 200 W/cm ² .

In the case of an electric type, all of the 200W/m ² is naturally consumed by power consumption, but in the case of the present invention, even if a pump is used, the power consumption is only a few W/m ² and its efficiency is It will be several dozen times more.

The comparison with the sprinkler type was mentioned earlier, but especially when underground water is used for water flow, after using it for this purpose, the outlet 7 of the pipe 2 should be connected directly or through water flow utilization equipment or a storage tank for that purpose. The system is connected to the end of the return flow path connected to the return well and returns directly to the underground, thereby preventing the waste of water resources and preventing environmental contamination and soil pollution, which are currently of most concern. In addition to preventing subsidence, it also prevents water from flowing onto the road surface, and the benefits of a more proactive recharge system can be expected.

Next, compared to heat pipes, there are other snow removal methods that are superior in that they are less expensive and can have the opposite effect, such as solar heat utilization, and methods that run hot water through pipes. It is clear that compared to the above, it does not require heating equipment or fuel, and is far superior in terms of resource and energy conservation.

Furthermore, in the present invention, such equipment is not only used for the above purposes, but also when the temperature of the road surface 1 is higher than the temperature of the water in the pipe line 2, it is used to heat the water. Focusing on the use of a single piece of equipment as a heat collector for snow removal and freezing prevention, as well as the return of drainage water underground to prevent wastage of water resources, pollution, and environmental deterioration, we also aim to conserve resources. It can be used for both purposes, including the effective use of energy, increasing the year-round effect.

Conventionally, it has been said that it is difficult to utilize solar heat in areas with heavy snowfall, and it is even more impractical to use solar energy to heat groundwater that runs through pipes buried under concrete asphalt. It was neglected as a matter of fact. However, according to research over the past few years in Yonezawa City, Yamagata Prefecture, which is known as a typical snowy area, the number of hours during which solar heat can be used is 2,400 to 2,500 hours a year, from December to February next year. 150 hours per month even during the winter months. Results from experimental road surfaces show that the effect is 300W/ ^m2 even in May, and can exceed 500W/ ^m2 in the summer.

If you compare this with a dedicated solar collector,
There are some disadvantages such as the maximum temperature that can be reached, but on the other hand, in areas with heavy snowfall, collectors installed outdoors become a nuisance during snowfall, and have disadvantages such as the hassle of installing and removing them each season.

In the case of this invention, considering that it can be used both as equipment for snow removal and anti-freezing and as equipment for absorbing and utilizing solar heat at high temperatures, it is far superior in terms of equipment cost. In addition, the energy obtained can be used in various ways, but if we look at an example where hot water obtained in a household-scale experiment is used for baths, kitchens, etc., Because it is equipped with a heat absorber, it has good heat absorption efficiency, so there is almost no need for supplementary heating in midsummer, and
For the month from October 1st to October 31st, the average amount of kerosene used over the past six years was 159, but with this method, the amount was reduced to 110, which is a savings of about 31%.
Furthermore, excess drainage water is returned underground to prevent ground subsidence and the occurrence of pollution.

Taken together, this invention not only contributes to resource conservation as described above, but also plays a role in enriching lives by conserving energy or actively using energy through the activation of solar energy, and is capable of contributing to the conservation of resources as described above. It is economically superior compared to other methods, and since all wastewater is returned underground, water resources are used effectively and there is no risk of environmental deterioration due to pollution, ground subsidence, or running water on road surfaces. It is clear that this is an extremely superior reversible tube device.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view of a road provided with a pipe device according to the present invention, Fig. 2 is a plan view, Fig. 3 is a partial vertical sectional view of another embodiment, and Fig. 4 is shown in Fig. 3. FIG. 1...Road surface, 2...Pipeline, 3...Foundation, 4...
Upper layer, 5... Lower layer, 6... Entrance, 7... Exit, 8
...Metsushiyu, 9, 10...Supervising.

Claims (1)

[Claims] 1. Laid so that water can flow under the paved road surface without opening above the road surface, and the discharge side end of the water flow is at least at the water supply end of the water flow utilization equipment and the end of the return path to the water flow supply source. It is equipped with a connecting pipe and a mesh that is installed in contact with the upper surface of the pipe and has high heat absorption and exhaust efficiency, and by passing natural groundwater through the pipe, it is Energy is mainly supplied to the road surface from groundwater, and snow removal from the road surface,
It prevents freezing, and in the warm season, it absorbs solar heat from the road surface into water, and also supplies the water discharged from the pipes to the above-mentioned equipment and returns it to the water supply source. A reversible tube device characterized in that it is configured to perform at least one of the following.