JPH0813849A - Method and apparatus for preventing freeze on eaves by electrical heating - Google Patents

Abstract

PURPOSE:To prevent freeze on the edge of the eaves with a less amount of electric power consumed by a method wherein a plate-like heating body of a specified width is brought into contact with the lower part on the front of a steel roof plate with the heating surface thereof fixed in parallel with the roof steel plate, and generation of heat from the heating body is controlled by operation of temperature sensors. CONSTITUTION:A plate-like heating body 5 of 3-10cm width is fixed with a fixing body 6 for fixing the plate-like heating body 5 to the surface of a fascia board 4 in parallel with a roof steel plate 2 on a position near the lower part on the front end 3 of the roof steel plate 2. A lead wire 7 for power source for the plate-like heating body and a lead wire 8 for a temperature sensor for automatic control are laid in a space 6a for storing the lead wires and connected to a power source controlling panel. As automatic control is made to be available with contact being kept to the power source, the temperature on the surface of the plate-like heating body 5 falls when snowfall 16 is made on the roof or melted snow 18 flows over the plate-like heating body 5, and heating starts with electric power supplied to the heating body. When snowfall 16 and melted snow 18 are not present, sensors 14 and 15 work to interrupt supply of electric power. When the plate-like heating body 5 is in operation, snowfall 16 is melted by heat of the heating body, heat 24 conducted and radiant heat 25 from the heating body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eaves ice formation preventing method and an eaves ice formation preventing device which prevent the formation of icicles and ice dikes generated on the roof eaves of buildings and prevent the rolling of snow canopies. Is.

[0002]

2. Description of the Related Art In snowy and cold regions, roof snow melts due to heat from indoor heating and solar heat, and the snowmelt water freezes at the eaves and becomes ice icicles on the roof of the icicle, which grows and rains the snowmelt water. It may cause a "sugar leak obstacle" beyond its behavior, damage the building due to a large spillage, or fall to cause damage to pedestrians and vehicles. As a measure against this,
It is common to thaw the snow on the eaves and heat it to prevent freezing. As a method for this, in the case of an iron plate thatched roof of a general wooden house, a method of installing a heating device of an electric heating type or a hot water type under or on the iron plate roof is performed. Also, in order to prevent only icicles from being generated, a method of installing a conduit tube with a heating wire under the snowmelt water flow section at the tip of the eaves is used. Fig. 5 shows an example of an eaves heating facility where an electric heating type plate-like heating element is installed under the roof material, which is commonly used for iron plate roofs often found in cold climate houses. An example of a conduit facility is shown in Fig. 6.

The details will be described with reference to FIG. 5. Reference numeral 2 is a roof iron plate, 4 is a braided surface, 5 is a plate-shaped heating element, 26 is a base plate, 27 is a nose cover, and 28 is a strip-shaped insulated heating wire. In a snowfall or snowfall state, electricity is applied to the plate-shaped heating element 5 and the strip-shaped insulated heating wire 28 to heat the roof iron plate and the braided portion to melt the snow, and to drain it as water to eliminate freezing and snow accumulation at the eaves. Further, in FIG. 6, reference numeral 4 is a braided surface, 13 is an insulated heating wire, 29 is a metal conduit tube, 30 is a saddle for mounting a metal conduit tube, 31 is an insulating bushing, and 32 is a thermostat portion, which is an insulated heating wire 13. Indicates that the wire is installed in the metal conduit tube 29. When the snowmelt water on the roof flows down from the eaves tip, the icefall and icicles at the tip of the eaves are prevented by a method of once hitting the snowmelt water on the heated metal conduit tube 29 and dropping it.

[0004]

However, these methods have the following problems. That is, in the method of installing the plate-shaped heating element under the iron plate on the roof of the eaves, the power consumption is about 130 to 200 W per 1 m of the eaves length of 45 cm and the maintenance cost is high. In the case of an existing building,
After removing the existing roof iron plate, it is necessary to install a plate-shaped heating element and then restore it, which requires a long construction period and high equipment construction costs. In addition, the method of installing a metal conduit tube with an insulation heating wire on the rugged surface of the eaves is to energize at a power consumption of about 40 W or more per 1 m, and it is possible to prevent icicles from the tip of the eaves The effect of preventing the formation of ice banks and snow canopies cannot be expected, and this method alone can be applied only to areas with relatively small snowfall. In addition, the metal conduit tube has a drawback that it has a poor appearance and spoils the aesthetics of the building. The present invention solves such problems, and mainly relates to an eaves edge freezing prevention method and device for the purpose of preventing the generation of icicles, which can be expected to prevent the formation of ice banks and curbing of rolling-up by a snow cane, and It is an object of the present invention to provide an eaves edge freezing prevention method and an apparatus thereof that can be performed with a small amount of power consumption.

[0005]

In order to solve the above problems and achieve the object of the present invention, the eaves edge freezing prevention method and its apparatus according to the present invention are characterized by the following configurations. That is, a width of 3 to 10 cm containing a temperature sensor
The plate-shaped heating element, a plate-shaped heating element mounting main body having a space for accommodating the heating element power supply lead wire and the temperature sensor lead wire, and a power supply control panel. -Shaped heating element is in contact with the lower end of the roof iron plate, and the heating surface is installed in parallel with the roof iron plate to prevent freezing of the eaves.It also detects the temperature of the outer surface of the plate-shaped heating element. It is characterized in that a temperature sensor that operates in accordance with the above is installed, and that a mechanism for controlling energization is provided. The present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view of an example of a facility on an iron plate roof of a general house, and Fig. 2 is a partially cutaway view of the plate heating element and a plate heating element mounting main body. . As shown in FIG. 1, the plate-shaped heating element 5 is attached to the lower part of the tip 3 of the roof iron plate, and the heating surface is parallel to the roof iron plate. After mounting and fixing to the plate using screws, the power supply lead wire 7 for the plate-shaped heating element and the lead wire 8 for the temperature sensor are wired using the space 6a for housing the lead wire, and the power supply control panel Connect to 9 and complete construction. As shown in FIG. 2, the plate-shaped heating element 5 has a substrate 11 made of synthetic resin,
An insulating heating wire 13 integrated with a heat insulating plate 12 of cross-linked foamed polyethylene, urethane foam, or the like is placed, and a plate-shaped heating element having a width of 3 to 10 cm is covered with a color iron plate 5a having excellent corrosion resistance and weather resistance. Power lead wire 7 for plate heating element from one end
Also, the lead wire 8 for the temperature sensor is drawn out. Further, it is integrated with a plate-shaped heating element mounting main body 6 which accommodates a plate-shaped heating element power supply lead wire 7 and a temperature sensor lead wire 8 below the plate-shaped heating element. The plate heating element is best if it is a sheet heating element, such as glass fiber polyester resin (FRP resin), polyethylene, AB
A structure in which a heating wire is embedded in S resin or the like may be used. Further, the plate-shaped heating element has a temperature sensor such as a thermistor for detecting the surface temperature of the heater and a platinum temperature measuring element-1.
4 may be incorporated, or a moisture sensor 15 for sensing moisture may be attached to the surface of the plate-shaped heating element to automatically control.

[0006]

The operation of the present invention will be described with reference to the drawings. It should be noted that FIG. 3 is a view showing a state where there is snow on the roof of an iron plate roof of a general house and the device of the present invention is operating. As described above,
Since the plate-shaped heating element was installed in contact with the lower part of the roof iron plate along the roof slope, as shown in Fig. 3, the indoor snow heat from the roof snow 23 and the water melted by the solar heat generated electricity and generated heat. Plate-shaped heating element 5 that is rising-iron plate 5
It does not freeze in the state of water that passes through the top of a and falls from the lower end. That is, it is possible to completely prevent the occurrence of icicles. At the same time, since the plate-shaped heating element 5 is provided in contact with the lower end of the roof iron plate, the heat generated from the plate-shaped heating element 24 heats the roof iron plate at the eaves part to prevent the growth of ice banks. Further, the radiant heat 25 from the plate heating element melts the tip 22 of the snow cover on the roof, and the roof iron plate tip 3 is not always in contact with the snow cover. Therefore, since the snowmelt water from above the roof does not flow toward the tip 22 of the snow and flows down to the tip of the roof iron plate, not only icicles do not occur, but also icicles on the underside of the snow cane do not occur. In addition, there is no overhang of the snow canopy and the so-called rolling-up phenomenon can be suppressed. On the roof, there is a phenomenon that the contact surface between the roof iron plate and the snowfall melts and the snowfall itself descends gradually.However, since the tip of the roof iron plate is heated, the snowfall is gradually melted and rolled. Who can deter.

The automatic control is a method in which a temperature sensor is installed on the surface of the plate-shaped heating element to detect the surface temperature of the plate-shaped heating element. In this method, there is snow on the plate-shaped heating element, or snow-melting water. The temperature of the temperature sensor does not rise when it is flowing, and it stays at a low temperature.On the other hand, the temperature rises when there is no snow and the flow of snowmelt water disappears. Is turned on (energized), and turned off (disconnected) when the temperature rises to a certain temperature. The same effect can be obtained by using a moisture detection sensor that senses and operates the snow-melting water on the surface of the plate-shaped heating element. Further, these methods can be combined with the control based on the outside air temperature. Furthermore, the methods of detecting the outside air temperature and the surface temperature of the plate-shaped heating element and detecting the water content can be used together. Any of these methods is an energy-saving method that does not use wasted electricity because it is a method that energizes only under conditions where icicles are generated or snow canopies are formed.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. In FIGS. 1 and 2, a roof iron plate 2 such as a color iron plate flat roof is located near a lower part of a roof iron plate tip 3 of the roof iron plate 2 and in parallel with the roof iron plate, a width of 3 cm, a power consumption of 30 W / m per 1 m and a width of 10 cm. Power consumption per meter 6
Two types of 0 W / m plate-shaped heating element 5 are individually attached to the braided surface 4 by the plate-shaped heating element mounting body 6 with wood screws or the like, and the plate-shaped heating element power supply lead wire 7 and automatic A control temperature sensor lead wire 8 is provided with a lead wire storage space 6a.
Was used for connection and connection to the power supply control panel 9, and a comparative test was conducted. The usage state will be described with reference to FIG. When the power is always turned on and in the automatic control state, when the snow falls and there is snow 16 on the roof, or when the snowmelt water 18 passes over the plate-shaped heating element 5, the surface temperature of the plate-shaped heating element decreases and heating is performed through electricity. When there is no snowfall and no snowmelt water, the temperature of the plate-shaped heating element begins to rise, and when the temperature of the temperature sensor part exceeds a certain temperature, the sensor operates and the power is cut off. When the plate-shaped heating element 5 is operating, this heat not only causes snowfall in a portion in contact with the plate-shaped heating element, but also conductive snow 24 from the plate-shaped heating element and radiant heat 25 from the plate-shaped heating element cause nearby snowfall. Melt.
Further, the temperature of the roof iron plate 2 rises due to the indoor heat flow 23 generated by the indoor heating, and the contact surface with the snow 16 begins to melt.
Although the phenomenon that 6 descends is repeated during the winter, the heat of the plate-shaped heating element 5 and the tip 3 of the roof iron plate warmed by the plate-shaped heating element 5 melts the snow, preventing icicles from occurring and letting out the eaves. Was also confirmed to be small. Further, when the snowmelt water 18 flows down, the snowfall tip 22 of the snowfall 16 is located at a high position and does not flow in the snowfall tip direction toward the lower roof iron plate tip 3 direction from the lower end of the plate heating element 5. It was confirmed to fall. In addition, FIG. 3 shows a result of an investigation of the snow accumulation state during the use of one season, and the roof iron plate tip 3 and the snow accumulation 16
Were not in contact with each other for about 10 cm, and an ice bank 17 having a thickness of about 1 to 5 cm was formed on the roof iron plate 2 above the cover for about 10 to 40 cm. The height of snow at this time is 50
~ 70 cm, the width of the plate-shaped heating element is 3 cm and 10 cm
A comparative test was conducted on the above items, but there was no great difference in the state. The state at the same place where the plate-shaped heating element is not installed at this time is as shown in FIG. 7, and is about 10 cm thick at the tip 3 of the roof iron plate, about 40 cm above the tip 3 of the roof iron plate, and about 20 cm in the projecting direction. An ice levee 17 having a total length of about 60 cm was formed, and a reservoir 20 was recognized above the ice levee. This can be said to be a phenomenon of "sugar leak" 21 (a phenomenon in which snow melt water enters the room) caused by the snow melt water exceeding the rain season. In addition, Fig. 8 shows the rolling-up phenomenon caused by the misalignment of the canopy, and Fig. 9 is equipped with a metal conduit tube 29 having an insulation heating wire 13 built in on the roof surface of the roof iron plate bottom surface in the area where the amount of snowfall is relatively small. Indicates the usage state at the time. FIG. 10 shows a usage state when the metal conduit tube 29 having the insulated heating wire 13 is installed in an area where a large amount of snowfall occurs.
FIG. 4 shows the temperature characteristics of the sensor portion in practical use by the surface temperature detection sensor of the plate-shaped heating element 5. The position of A in FIG. 4 is
This is the position where the plate-shaped heating element 5 which had been energized due to the presence of snow on the plate-shaped heating element 5 completed the melting of snow and started to rise in temperature. The position B indicates a position where when the temperature rises and the power is cut off, the temperature C of the plate-shaped heating element lowers as the outside air temperature lowers, and the power supply is restarted.

[0009]

As described above, since the present invention is configured as described above, it has the following effects. This is an electric heating type eaves icing prevention method and device that is easy to install and has a good appearance, and the cost of the device itself and the cost of equipment construction are low. It has the effect of suppressing rolling. Furthermore, the automatic control is a method of energizing only when snow melting and icicles are prevented, and is a great energy saving effect that does not use unnecessary electric power.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an eaves tip portion showing an embodiment of the present invention.

FIG. 2 is a partially cutaway configuration diagram of a plate-shaped heating element showing an embodiment of the present invention.

FIG. 3 is a usage diagram of the device of the present invention.

FIG. 4 is a temperature characteristic diagram of automatic control of the apparatus of the present invention.

FIG. 5 is a partially cutaway view of a conventional device in which a plate-shaped heating element is installed under a roof iron plate and a strip-shaped insulated heating wire is installed inside a karaks surface.

FIG. 6 is an explanatory diagram in which a conventional metal conduit tube with built-in insulation heat generation is installed from the front of the eaves to the comb surface.

FIG. 7 is a diagram showing an icicle generation state when there is no heating device at the eaves end.

FIG. 8 is a diagram showing a rolling-up phenomenon that occurs when the eaves are displaced when the heating device is not provided at the eaves end.

9 is a diagram showing a state of generation of icicles when the conventional metal conduit tube with a built-in insulated heating wire shown in FIG. 6 is installed.

FIG. 10 is a diagram showing a usage state when a metal conduit tube having a built-in insulated heating wire is installed in an area where a large amount of snowfall occurs.

[Explanation of symbols]

1 house, 2 roof iron plate, 3 roof iron plate tip, 4 flat surface, 5 plate heating element, 5a color iron plate, 6 plate heating element mounting body, 6a lead wire storage space, 6b body mounting Hole, 7 power supply lead wire for plate heating element, 8 lead wire for temperature sensor, 9 power control panel, 10 wiring, 11 board, 12 heat insulating plate, 13 insulating heat wire, 14 temperature sensor, 15 Moisture sensor-, 16 snow cover, 17 ice bank, 18 snow melt water, 19 icicles, 20 reservoir, 21 leak, 22 snow tip, 23 indoor heat flow, 24 conduction heat from plate heating element, 25 Radiant heat from plate heating element, 26 Field plate, 27 Nose cover, 28 Strip insulation heating wire, 29 Metal conduit tube, 30 Metal conduit tube mounting saddle, 31 Insulation bushing, 32 Thermostat part, A Complete snow melting The temperature begins to rise Point, point B temperature rises, which automatically deenergized time points, because it becomes less C constant temperature, start the automatic energization.

Front page continuation (72) Inventor Akira Akira Kiriyama 1-2-1, Koriyama, Taihaku-ku, Sendai-shi, Miyagi Kita Nippon Electric Cable Co., Ltd. (72) Hiroaki Wakasa 1-2-1 Koriyama, Taichiro-ku, Sendai-shi, Miyagi Inside Kita Nippon Electric Cable Co., Ltd.

Claims (4)

[Claims] 1. A plate-shaped heating element is brought into contact with the lower end of the tip of a metal roof plate, and a heating surface is attached in parallel with the roof plate surface.
Prevention of electric ice-type eaves frost formation, characterized by heating the roof plate by conduction heat from the plate heating element to the eaves of the roof plate and melting the tip of the snow on the roof by radiant heat from the plate heating element Method. 2. An elongated plate-shaped heating element containing a temperature sensor, a heating element mounting body having a space for accommodating the heating element power source lead wire and the temperature sensor lead wire, and a power source. A control panel, the plate-shaped heating element is brought into contact with the lower end of the metal roof plate, and the heating surface is attached parallel to the roof plate surface, and the heat generation of the heating element is controlled by the operation of the temperature sensor. An electric heating type eaves icing prevention device characterized in that 3. The electrothermal eaves frost prevention device according to claim 2, wherein a sensor for detecting moisture is provided on the outer surface of the plate-shaped heating element, and the heat generation of the heating element is controlled by the operation of the sensor. 4. The electric heating type eaves edge anti-icing device according to claim 2, wherein the plate-shaped heating element has a width of 3 to 10 cm.