JPH0255561B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a road heating device for preventing road surfaces from freezing and melting snow in cold regions.

(Technical background of the invention and its problems) Conventionally, methods for preventing road surfaces from freezing and melting snow in cold regions include installing sprinklers along the road and sprinkling water on the road surface, spraying calcium chloride, etc. Alternatively, in hot spring areas, hot spring piping is constructed under the road surface to utilize hot spring heat.

However, installing the above-mentioned sprinklers increases the cost, and the nozzles are easily clogged with dirt and sand, which increases water pressure and concentrates water from unclogged nozzles, causing pedestrians to may cause trouble. In addition, spraying calcium chloride is complicated, requires a lot of labor, and requires a large amount of money.
Furthermore, although hot spring piping can solve the above-mentioned problems to some extent, it cannot be used outside of hot spring areas.

In addition, recently in cold regions, a pipe snow melting method has been used in which pipes are installed under the road surface and hot water is circulated through the pipes. However, conventional pipe snow melting methods involve flowing hot water in the same direction from one end to the other on the same side of the pipe, or bending a small number of pipes in parallel many times.
Since hot water is distributed only from one end of the road surface to be heated, the heating power is weaker in the middle of the installed pipes or near the hot water outlet, and the road surface is uniformly distributed over a wide area. In addition, if the pipe is bent and arranged, even if a part of the pipe is damaged or pinballed, it is difficult to find that part, and the problem is to heat the pipe. There is a problem that replacement and repair work is complicated.

(Object of the Invention) This invention was made with attention to the above-mentioned circumstances, and its purpose is to be able to uniformly and efficiently heat the road surface to prevent icing and snow accumulation on the road surface, and to To provide a road heating device that can quickly and easily thaw frozen road surfaces and snow piles as needed, is easy to install and repair, and is durable and can be used semi-permanently. There is a particular thing.

(Summary of the Invention) In order to achieve the above object, the present invention arranges a large number of seamless pipes for circulating a heat medium such as hot water under the road surface at approximately parallel and equal intervals, and An inlet header and an outlet header are installed at both ends in a direction substantially perpendicular to the pipe, and one end of each pipe on the same side is alternately connected to an inlet header or an outlet header, and the other end of each pipe is connected to an inlet header or an outlet header. The pipe units are alternately connected to the outlet header or the inlet header and are arranged so that the flow directions of the heat medium are opposite to each other in adjacent pipes to uniformly heat the road surface. It's what I did.

(Embodiments of the Invention) The present invention will be described below based on embodiments shown in the drawings.

1 to 5 show a first embodiment, and numeral 1 indicates a road surface paved with concrete or asphalt. A piping unit 2 through which a heat medium such as hot water flows is buried under the road surface 1 at the same time as the above-mentioned paving work. This piping unit 2
is constructed as shown in FIGS. 2 and 3. That is, 3... are seamless pipes that are arranged on a straight line in parallel with the road surface 1 at regular intervals, and on both ends of these pipes 3, there are an inlet header 4 and an outlet header 5, respectively. are wired in parallel and in a direction perpendicular to the pipes 3 (in the width direction of the road surface 1). One end of the same side of the pipes 3 is alternately connected to the inlet header 4 and the outlet header 5, and one end of the other end of the pipe 3 is connected to the inlet header 5. For connected pipes, the outlet header is attached to the outlet header, and for pipes that have one end connected to the outlet header, the outlet header is attached to the inlet header, and so on every other pipe.
and the inlet side header 4 alternately. In other words, each pipe 3... has one end connected to the inlet header 4 and the other end to the outlet header 5, and the ends of each pipe on the same side are connected alternately to the inlet header and the outlet header. In this way, the pipes 3 are arranged such that the flow directions of the heat medium flowing through the pipes 3 are opposite to each other in adjacent pipes 3. (In Fig. 2, the arrow indicates the flow direction of the heat medium.) The inlet header 4 is connected to the outlet of the boiler 7 as a heat medium generation source via the feed pipe 6, and the outlet header 5 is connected to the outlet of the boiler 7 as a heat medium generation source. It is connected via a pipe 8 to a suction port 10 of a pump 9. Furthermore, the discharge port 1 of this pump 9
1 is connected to the inlet of the boiler 7, which is a heat medium generation source, and constitutes a circulation path 12 for the heat medium.

Furthermore, the pipe 3 through which the heat medium flows,
It is a soft steel pipe as shown in FIG. 4, and a corrosion-resistant synthetic resin coating 13 such as polyamide is applied to the outer or inner and outer surfaces thereof. The components of this soft steel pipe are as follows.

C...0.15-0.1% Si...0.01% or less Mu...0.2-0.5% P...0.02% or less S...0.02% or less The rest is mostly iron. The length is approximately equal to the length of each span 17 divided into spans 17, and the inner diameter is 10.0 mm to 14.0 mm. The synthetic resin coating 13 is applied by painting, electrodeposition, coating, etc., and has a thickness of about 0.1 mm.

The pipe 3 thus formed is wound and expanded by a winding and feeding device 14 shown in FIG. That is, 15 is a winding frame for winding the pipe 3 into a coil shape, and the pipe 3 that is unwound by the rotation of this winding frame 15 is corrected by a plurality of pinch rollers 16 to make it straight. It is expanded as pipe 3.

When the pipe 3 is installed on the road surface 1, each span 1 is divided into a plurality of sections along the length of the road.
Install it at the end of 7. When the winding frame 15 is rotated to unwind the coiled pipe 3, the pipe 3 is unwound while being corrected by the pinch rollers 16, and is stretched straight. After the necessary number of long pipes 3 are drawn out and expanded in this manner, they are laid out along the length of the road, and the pipes 3 are arranged in parallel. Then, connect one end of each pipe 3 to the inlet side header 4,
The other end is connected to the outlet header 5. Pipe 3...
After piping the inlet header 4 and the outlet header 5, the piping unit 2 is connected to the road surface 1 by performing normal asphalt paving or concrete paving.
It will be buried directly below. In this case, the pipe 3 is a soft steel pipe, but since the synthetic resin coating 13 is applied to its surface, there is no risk of corrosion.Therefore, there is no need to increase the wall thickness of the steel pipe as a corrosion allowance. The effect of this can be fully demonstrated.

FIG. 6 shows a second embodiment, in which pipes 3 are arranged in the width direction of the road surface 1, and pipes 3 are arranged on both ends of the road surface 1.
9, 19 are provided with an inlet header 4 and an outlet header 5 connected to the pipes 3.

In each of the above embodiments, the pipe was formed of a soft steel pipe coated with a synthetic resin.
A flexible pipe such as an ethylene vinyl pipe may also be used. In this case, the pipe is lightweight, easy to carry and install, and is suitable for concrete pavement.

In addition, in each of the above embodiments, the piping unit was buried directly under the road surface, but on roads with a lot of traffic, for example, reinforcing bars made of metal or concrete may be placed between the pipes as appropriate. This may prevent damage to the piping unit due to the weight of passing vehicles being applied directly to the piping unit.

On the other hand, although hot water and hot brine are circulated as means for circulating the heat medium through the pipe, hot water may be discharged from the outlet side header.

(Effects of the Invention) As explained above, according to the present invention, by arranging the pipes under the road surface so that the flow direction of the heat medium is reversed between adjacent pipes, it is efficient and efficient even in cold regions. Not only can the road surface be prevented from freezing and snowing evenly, but it can also quickly thaw and thaw even after freezing or snow has fallen. Therefore, it is more economical than conventional sprinklers and other malfunctioning calcium chloride spraying methods, and by burying the pipes under the road surface, it can be used semi-permanently, and there is no need to expose anything from the road surface even in the off-season. There is no need for it to get in the way.

Furthermore, according to the present invention, a set of two headers each consisting of an inlet header and an outlet header are provided not only at one end of each pipe but also at both ends, and the ends of each pipe on the same side Each pipe is connected alternately to the inlet header and the outlet header, and the flow direction of the heat medium flowing in adjacent pipes is opposite, so the heating effect of the heat medium flowing in the pipes is directly connected to the road surface. This means that the snow will be evenly distributed over the whole area, and uneven snow melting will not occur. In addition, since the pipes are arranged in a straight line without any joints, there is no risk of the heating power at the joints decreasing or the heating medium leaking out from the joints, and if pinholes etc. occur in the pipes, Even if the problem occurs, it is easy to find, and maintenance and repair are easy because it is sufficient to replace only the pipe in question. Moreover, according to this invention, the piping unit is simply laid under the road surface, so
The construction work is simple and low cost, and has great practical value.

[Brief explanation of the drawing]

Figures 1 to 5 show a first embodiment of the present invention, in which Figure 1 is a plan view of the piping unit buried under the road surface, Figure 2 is a plan view of the piping unit, and Figure 3 is a plan view of the piping unit. The figure is a system diagram of the load heating device, Figure 4 is a sectional view of the pipe, Figure 5 is a plan view showing the state of the pipe, and Figure 6 is the second embodiment of the present invention.
It is a top view showing an example of. 1... Road surface, 2... Piping unit, 3... Pipe, 4... Inlet side header, 5... Outlet side header,
7...Boiler (heat medium generation source).

Claims (1)

[Scope of Claims] 1. A large number of seamless pipes are arranged in a straight line, substantially parallel to each other, and at regular intervals under the road surface, and an inlet header and an outlet header are provided at both ends of the pipes, respectively. The other end of the pipe is arranged in orthogonal directions, one end of the same side of each pipe is connected alternately to one of the inlet side header and the outlet side header, and the one end is connected to the inlet side header. is connected to the outlet header at the other end, and the other end of the pipe whose one end is connected to the outlet header is connected to the inlet header at the other end to form a piping unit, and each inlet header of this piping unit is connected to the supply side of a heat medium generation source to allow a heat medium to flow through each of the pipes, and the direction of flow of the heat medium is opposite in adjacent pipes. Device. 2. The road heating device according to claim 1, wherein the pipe is made of metal and has a synthetic resin coating applied to at least its outer surface. 3. The road heating device according to claim 1, wherein the pipe is made of synthetic resin having corrosion resistance. 4. The road heating device according to claim 1, wherein the heat medium generation source is a boiler that generates hot water.