JPH0321701A - Heater buried road - Google Patents

Abstract

PURPOSE:To melt snow on various kinds of roads and to prevent freezing by coating each temperature self-control type heater with a cover made of metal and burying the heater in concrete or asphalt. CONSTITUTION:Two electrodes Hb are buried in a belt like conductive component Ha obtained by mixing conductive material in resin and a self-temperature control function is provided in a heater H. In a metal cover 6, flanges 6b extending to right and left sides relative to a pressed part 6a for housing the heater H are provided and laid so as to be closed to the flange parts 6b of another adjacent cover 6. Temperature distribution of the heater H is thus made even. Then, the cover 6 is applied on the heater H. Then, the heaters H are buried in an asphalt mortar layer 3 above an asphalt stabilizing layer 2 at suitable pitches.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heater-embedded road surface in which a heater is embedded in order to prevent snow melting and freezing of various road surfaces.

Traditionally, in snowy regions, alloy wire heaters, hot water pipes, etc. are buried in road surfaces (roadways, sidewalks, parking lots, etc.) to melt snow and prevent freezing. Problems to be Solved by the Invention> However, in the case of alloy wire heaters, when installing them,
Various sensors (snowfall sensor, road surface temperature sensor, etc.) and temperature controllers are required, making the equipment system large-scale and increasing equipment costs.At the same time, the output per unit length is small (9 to 15 W/m). Sufficient snow melting and antifreezing ability cannot be obtained (snow melting varies depending on region and time, but there are two
00 to 300 W/m"), there is a problem in quickly melting snow during snowfall, and furthermore, since the length of the heater is usually a fixed length, it is difficult to cut it to an arbitrary length. There are problems when installing in narrow spaces with complicated shapes, and more importantly, when there are air spaces such as voids at the interface (surroundings) of the alloy wire, local In some cases, abnormal heat generation occurred and wires were disconnected.

On the other hand, in the case of hot water pipes, in order to obtain snow melting and anti-freezing ability immediately when it snows, the hot water temperature needs to be kept at around 40 to 60"C at all times, resulting in large energy loss and the need for heating boilers, piping networks, etc. In addition to requiring large-scale equipment and increasing equipment costs, it also used a large amount of water and caused problems such as freezing and damage of the pipes when the operation was stopped.

The present invention has been made in view of such conventional circumstances.

Means for Solving the Problems The present invention is characterized by embedding a self-temperature control type heater in concrete or asphalt, and if necessary, covering the heater with a metal cover. Alternatively, there is a heater buried in the road surface where the heater is surrounded by a metal heat dissipation protection cover and buried.

<Function> The temperature is automatically controlled by the above-mentioned self-temperature control type heater, and the strength of the heater is reinforced by the metal cover and the metal heat radiation protection cover, and the heat generation temperature is made uniform. An extremely excellent road surface for embedding heaters can be obtained. Embodiment> FIGS. 1 and 2 show an embodiment of a road surface in which a heater is embedded according to the present invention.

In the figure, l is a roadbed hardened with crushed stones, etc., 2 is a stabilized layer of concrete or asphalt located on this roadbed l and made of reinforced concrete or, if necessary, reinforced concrete with insulation, 3, 4. Reference numeral 5 denotes an asphalt mortar layer, a coarse-grained asphalt concrete layer, and a dense-grained asphalt concrete layer, which are successively constructed on the asphalt stabilizing layer 2.

Self-temperature control type heaters H are embedded in the asphalt mortar layer 3 at appropriate pitches (intervals), and a metal cover 6 is further placed over the heaters H.

This heater H consists of two electrodes Hb, Hb embedded in a strip-shaped conductive Mi premono Ha made of a resin mixed with a conductive material (carbon, metal powder, etc.). It has a large heat output (approximately 26 to 60 W/m), and when energized, it automatically lowers when the temperature rises from a predetermined value, and automatically increases when the temperature drops from a predetermined value. It has a temperature control function.

The reason why this heater H is buried in the asphalt mortar layer 3 is to prevent damage to the heater H or to prevent voids from occurring between the heater H and the boundary thereof as much as possible. For example, if the conductive composition Ha is directly buried in the coarse-grained asphalt concrete layer 4, etc., the conductive composition Ha may be scratched or damaged by coarse particles such as pebbles in this layer. Furthermore, if a void or the like occurs around the heater H, good heat conduction cannot be expected due to the insulation properties of the air layer within the void. In addition, in the case of this heater H, even if there is an air layer etc.
Unlike alloy wire heaters, it does not overheat and is automatically controlled by its self-temperature control function.

Further, the burial pitch, heat generation capacity, etc. of this heater H are not particularly limited, and vary depending on the type of road surface (roadway, sidewalk, parking lot, road surface inside a livestock barn), etc., and may be set as appropriate. Furthermore, the reason why the metal cover 6 is placed over the heater H is to function as a protection member for the heater H, and as shown in the figure, a flange 6b that extends widely from side to side with respect to the convex portion 6a in which the heater H is housed. , 6b are provided, and the flange portions 6b, 6b are preferably installed as close as possible to the flange portions 6b, 6b of the adjacent metal cover 6, so as to make the temperature distribution from the heater H uniform. This is to make it last.

FIGS. 3 to 5 show other embodiments of the heater-embedded road surface according to the present invention.

This embodiment is basically the same as the embodiment shown in Figs. This allows the heater H to be directly buried in coarse-grained asphalt concrete N4. As described above, the coarse asphalt concrete N4 contains coarse particles such as pebbles, but the heater H is sufficiently protected by the metal heat radiation protection cover 10.

In this example, the metal heat dissipation protection cover 10 has a hook-shaped heater storage portion 11a and a flange portion llb, as shown in FIG.
a roughly L-shaped member 11 having a
A U-shaped heater storage portion 12a and a collar portion 12b that engage with a.
When the heater H is stored or taken out, the roughly U-shaped member 12 is moved up and down as shown in FIG. Also, the reason why relatively wide flanges 1lb and llb are provided on both members 11 and 12 is because of the third
As shown in the figure, when installing, the adjacent flanges 1lb, llb
This is to make the temperature distribution as close as possible to make the temperature distribution uniform.

Further, the shape of the metal heat radiation protection cover is not particularly limited, and for example, like the metal heat radiation protection cover 13 shown in FIGS. The base member l4 consists of the flange parts 14b, 14b.
and a U-shaped cap member l5 that is fitted into the central groove-shaped heater storage portion 14a. In this case, when the heater H is stored or taken out, the cap member l5 is inserted as shown in FIG. This is done by moving the member 15 up and down.

<Effects of the Invention> As is clear from the above description, the heater-embedded road surface according to the present invention provides the following excellent effects.

(1) Since the heater-embedded road surface has a self-temperature-controlled heater embedded in concrete or asphalt, the heat output per unit length is large, and snow melting and freezing prevention can be performed sufficiently and quickly.

(2) In addition, since the buried heater has a self-temperature control function, automatic temperature control is performed, and even if there is an air layer such as a void, there will be no abnormal heat generation, making it easy to control.
Additionally, there is no need for any large-scale equipment, and installation costs can be significantly reduced compared to conventional alloy wires and hot water pipes.

(3) In addition, if a metal cover is placed over the heater, or if the heater is surrounded and buried with a metal heat dissipation protective cover, the heater can be protected and the road surface temperature can be made uniform. I can do it.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a road surface in which a heater is buried according to the present invention, FIG. 2 is a perspective view showing the heater and metal cover of FIG. 1, and FIG. 4 is a sectional view showing another embodiment of the road surface, FIG. 4 is a perspective view showing the heater and metal heat radiation protection cover shown in FIG. 3, and FIG. 5 is a handling state of the metal heat radiation protection cover shown in FIG. 4. A perspective view shown,
FIG. 6 is a perspective view showing another example of a metal heat radiation protection cover, and FIG. 7 is a perspective view showing how the metal heat radiation protection cover of FIG. 6 is handled. In the figure, l... Roadbed, 2... Asphalt stabilization layer, 3... Asphalt mortar layer, 4... Coarse-grained asphalt concrete layer, 5... Dense-grained asphalt concrete layer, 6... Metal cover 10...Metal heat dissipation protection cover 13...Metal heat dissipation protection cover H...Heater, Fig. 1, Fig. 2" Hb Ha HD Fig. 3, Fig. 4, Fig. 5-4-Fig. 6 Figure 7 / / l 13

Claims (3)

[Claims] (1) A heater-embedded road surface characterized by a self-temperature-controlling heater embedded in concrete or asphalt. (2) The heater-embedded road surface according to claim 1, wherein the heater is buried with a metal cover placed over the heater. (3) The heater-embedded road surface according to claim 1, wherein the heater is surrounded and buried with a metal heat radiation protection cover.