JPH0921215A - Snow thawing device for roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely thaw snow at a minimum required fuel cost by laterally covering a roof panel with short galvanized irons closely, detecting a preset amount of snow accumulated on a roof and heating a housing and a garret in sequence. SOLUTION: Snow accumulated on a roof 1 which has fan motors stored in an upper box and a lower box to heat insides of the upper box and the lower box, an impeller and a bulb is detected by using the first and second sensors 2, 3. A boiler 5a to heat the roof 1 at the back for thawing snow accumulated on the roof 1, a circulation pump 5b, a pipe mat 4, a forwarding pipe 21 and a backwarding pipe 22 are arranged. When that snow accumulated on the roof 1 gets to a preset amount in steps is detected by using the first and second sensors 2, 3, the fan motor, boiler 5a and others are operated in sequence. Then, the thawing of snow on the roof 1 is started and, when the snow is being thawed to get to a preset amount or less in steps, the drive of the fan motor, the boiler 5a and others are stopped in sequence by a control panel 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow removal device for a roof, and more particularly, to a housing heating unit and an attic heating unit when snow on a roof advances and a snow detection unit detects a predetermined amount in a stepwise manner. The present invention relates to a roof snow removal device that operates sequentially to remove snow from a roof. The present invention also relates to a horizontal thatched roof, and more particularly to a horizontal thatched roof in which a plurality of strip-shaped galvanized iron plates whose lengthwise direction lies on the upper side of a roof substrate are roofed without gaps.

[0002]

2. Description of the Related Art Conventionally, as a snow removal device for heating the back surface of a roof by a heating means to remove snow on the roof, for example,
As shown in Japanese Patent Publication No. 1-21309, there is a roof snow removal device developed by the present applicant. This includes snowfall detection means in which the tray moves up and down due to the weight of snowfall, and snowfall detection means for detecting the presence or absence of snowfall on the roof with an electrode short-circuited with electrolyzed water. When continuously operated, the heating means is operated to start snow removal on the roof and the pan, and the heating is stopped when the electrode of the snow detection means is opened. This allows
It is an object of the present invention to provide a snow removal device for a roof that can completely eliminate snow without remaining snow, with the minimum necessary fuel cost.

Further, conventionally, in a region where the amount of snow is particularly large, a roof provided with a snow erasing device for erasing snow accumulated on the roof by circulating heated antifreeze in a plurality of pipes provided on the back side of the roof has been proposed. Has been built. Since the snow-removing device is convenient around water, it is often mounted on a vertical roof with a low slope. This vertical thatched roof is the vertical roof of a plurality of strip-shaped galvanized iron sheets. As the snow-removing device for this vertical roof, for example, as shown in FIG. 7 (b), a forward pipe 4a and a return pipe 4b are provided in the attic of the vertical roof 1 in accordance with the pitch of the vertical roof of the galvanized iron plate. The pipe mat is laid in a corrugated shape, and the antifreeze liquid heated by a heating means (not shown) is circulated in the pipe mat,
It was designed to melt the snow on the galvanized iron plate.

[0004]

However, the above conventional snow removing device for a roof has the following first problem. That is, due to the recent warming trend of winter, the number of days when heavy and wet snow falls during winter has increased. Especially when the snow begins to fall during the first snow or on a day when the temperature is relatively high, since the snow is wet snow, the snowfall detection means detects the snowfall with the weight of a small amount of snow on the saucer and activates the heating means. There is a problem that the heating means is operated more than necessary because the heating operation is performed with little or no snow accumulation, even if there is little snow accumulation. On the other hand, if snow falls on a cold day, it is light powder snow,
Since there is a considerable amount of snow on the saucer and the roof, the snowfall detecting means detects the snow and activates the heating means, so that the operation of the heating means varies. Further, when the operation of the heating means is stopped, it is performed by detecting that the electrode of the snow removal detecting means which is short-circuited by the melting water is in an open state. The upper remaining snow tends to be uneven, and if unevenness occurs, the electrode is opened and the heating means stops even if there is remaining snow, or the heating means operates even when there is almost no snow accumulation, and the heating means There is also a variation in the stoppage. In addition, since the flow of water that has melted snow is not uniform, it is often difficult or impossible to detect the flow of water accurately because it is detected or not depending on the position of the snow removal detecting means on the roof. . Therefore, since the operation and the stop of the heating means vary, there is a possibility that the fuel cost is wasted.

Further, the above-mentioned conventional roofing roof equipped with the snow-removing device has the following second problem. That is, as shown in FIG. 7 (b), the snow accumulated between the pitches of the pipe mat in which the antifreeze solution is circulated is hard to disappear, and it gets wet between the rising parts (protrusions) of the galvanized iron plate formed at each pitch of the vertical thatch. In many cases, it is difficult to completely remove the snow due to the snow clinging and the residual snow A easily occurring. In addition, the pipe mat laid in the attic in accordance with the pitch of the vertical thatch slips downward due to long-term use, and easily bends at the eaves side, making it difficult to achieve complete snow removal. Further, the pipe mat needs to be laid on the entire rear side of the vertical roof, which is troublesome for the work and increases the manufacturing cost.

A first object of the present invention is to solve the first problem of the prior art described above, to accurately detect the snow cover on the roof regardless of weather conditions such as snow quality, and to achieve a complete fuel cost with a minimum required fuel cost. It is an object to provide a snow removing device for a roof capable of removing snow. A second object is to solve the second problem of the above-mentioned conventional technology, and to provide a thatched roof in which snow melting easily slips down along the slope of the roof and at which the snow can be completely removed efficiently at low cost. Especially.

[0007]

In order to solve the above first problem, the present invention has a first configuration described below. That is, the first and second different heights for detecting snow accumulated photoelectrically
A snowfall detection means for detecting snowfall on the roof provided with a sensor, an attic heating means for heating the roof from the back surface side to erase the snowfall on the roof, and the first and second sensors on the roof When it is detected that the amount of snow has advanced to reach a predetermined amount, the attic heating means is activated to start snow removal on the roof, and the second and first sensors have advanced the snow removal of the roof to fall below a predetermined amount. When detecting that, the control means for controlling so as to stop the drive of the attic heating means,
It is equipped with.

Further, in order to solve the second problem, the present invention has a second structure described below. That is, in a horizontal thatched roof in which a plurality of strip-shaped galvanized iron sheets whose lengthwise direction is laid on the upper side of the roof substrate are tightly closed, each galvanized iron plate provided on the roof substrate at predetermined intervals in the lateral direction. A support plate for fixing the cover plate, a space part formed between the galvanized plate and the roof substrate by fixing the galvanized plate on the support plate in a bridging state, and at least covering the roof substrate of the space part. And a pipe mat provided with a plurality of pipelines for circulating the antifreeze liquid, which is laid according to the pitch of the thatching of the galvanized iron plate on the silver mat in the space portion. Is characterized by.

According to the above first structure, when it is detected that the amount of snow on the roof reaches a predetermined amount by the first sensor and the second sensor which photoelectrically detect snow and have different heights,
The control means activates the attic heating means to start the snow-discharging operation of the snow on the roof. When the snow-discharging of the roof progresses and the connection between the second sensor and the first sensor is cut off, the snow accumulation falls below a predetermined amount. When detected, the driving of the attic heating means is controlled to be stopped.

Further, when the snowfall detection means includes a housing heating means which is housed in a housing and heats the housing, when the control means detects snowfall by the first sensor and the second sensor, first, The housing heating means is actuated to dissolve the snow adhering to the circumferential surface of the housing, and then the attic heating means is actuated to start the snow-discharging operation of the snow accumulated on the roof, and the second sensor and the first sensor are sequentially connected. When cut, the housing heating means,
The operation of the attic heating means is sequentially stopped.

In addition, after detecting the snow accumulation by the first sensor and the second sensor in sequence, the attic heating means is actuated by delaying it for a predetermined time via a delay relay. Even if a foreign matter such as a bird enters, it is possible to prevent the attic heating means from accidentally operating.

Further, by not operating the attic heating means unless the temperature detected by the temperature sensor becomes equal to or lower than a predetermined temperature, the attic heating means is automatically activated when the preset snowfall temperature is reached. can do.

Even if the second sensor is turned off by setting the remaining snow timer, the control means maintains the operating state of the attic heating means by itself to remove snow for a predetermined time. Alternatively, the snow erasing operation can be performed according to the snowfall situation.

Further, according to the second structure, the galvanized iron plate is fixed in a bridging state on the support plate provided on the roof substrate at a predetermined interval and formed between the galvanized iron plate and the roof substrate. In the space part, a silver mat is laid so as to cover at least the roof substrate of the space part, and a pipe line for circulating the antifreeze liquid is laid on the silver mat of the space part in accordance with the pitch of the thatching of the galvanized iron plate. By laying a plurality of pipe mats, since the roof is a thatched roof, snow is likely to slip down along the slope of the roof, and the snow can be efficiently removed because it moves to the heating area of the pipe mat.

In addition, the temperature distribution of the roof can be averaged by alternately circulating the heated antifreeze liquid in the pipe of the pipe mat, and the snow can be completely extinguished without producing residual snow. be able to.

Further, the pipe mat is closely laid between the eaves of the roof and the vicinity of the angle for preventing snowfall, so that the melted snow moves on the roof surface and heats the areas where it is likely to accumulate. Can effectively remove snow.

Further, by laying a pipe for alternately circulating the antifreeze liquid on the angle provided on the roof, it is possible to remove the snow accumulated on the angle that receives the snowfall.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a vertical cross-sectional view of the roof, FIG. 2 is a perspective view of the first and second sensors, FIG. 3 is a wiring diagram of the entire snow removal device, FIG. 4 is a wiring diagram of the control panel, and FIG. 5 is a partial cutaway of the roof. FIG. 6 is a plan view and a side view, FIG. 6 is a schematic view showing a flow path and a flow direction of an antifreeze liquid flowing through a pipe mat, FIG. 7 is a comparative explanatory view showing a snow erasing state of a thatched roof and a thatched roof, FIG. FIG. 9 is an explanatory view when a pipe is laid on a gutter, FIG. 9 is an explanatory view when a pipe is laid on an angle, and FIG. 10 is an explanatory diagram showing a laid state of a pipe mat laid on a roof.

First, a schematic structure of a snow removing device for a roof will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a roof, which is laid on a horizontal roof (single-character roof) in which a plurality of strip-shaped galvanized steel plates 1a are laid in the longitudinal direction without any gap.
Reference numerals 2 and 3 denote first and second different heights as snow detecting means.
Sensors are provided on the galvanized plate 1a, on the light emitting side and the light receiving side, respectively, for photoelectrically detecting snow cover. Reference numeral 4 denotes a pipe mat laid on the back side of the roof 1 in accordance with the horizontal roof pitch of the galvanized sheet 1a. The pipe mat 4 is formed with a plurality of pipes for circulating an antifreeze (such as ethylene glycol).
A pipe mat 4 is always arranged below the galvanized plate 1a provided with the first and second sensors 2 and 3. Reference numeral 5a denotes a boiler, which heats an antifreeze heated to a predetermined temperature in a pipe formed in the pipe mat 4.
The antifreeze heated by the boiler 5a is circulated in the pipe mat 4 via the outward pipe 21 and the return pipe 22 by the circulation pump 5b. Reference numeral 6 denotes a control panel as control means, which operates so as to ignite the boiler 5a when the first and second sensors 2 and 3 are turned on for a predetermined time and to feed the heated antifreeze into the pipe mat 4 by the circulation pump 5b. Control. The boiler 5a, the circulation pump 5b, the pipe mat 4, the outgoing pipe 21, and the return pipe 22 constitute attic heating means.

The structure of the first and second sensors 2 and 3 will be described with reference to FIG. The first and second sensors 2 and 3 are arranged on the galvanized iron plate 1a of the thatched roof 1 and are spaced apart by a predetermined distance.
a and light receiving sensors 2b and 3b. The first sensor 2 is screwed onto the screw rod 7 so that the height of the first sensor 2 is about 2 cm from the roof 1, and the height of the second sensor 3 is about 5 cm. . The heights of the first and second sensors 2 and 3 can be set arbitrarily. Of the light emitting sensors 2a and 3a arranged in the upper and lower two stages, a partition plate 3c is provided on the lower surface of the upper light emitting sensor 3a so that light emitted from each other does not interfere on the light receiving side. Further, the light emitting sensors 2a, 3a and the light receiving sensors 2b, 3b are housed in a lower box 9 provided on the left and right, and are covered by an upper box 10 serving as a housing. This top box 10
After the lower box 9 is covered, the screw 12 is fitted into the screw hole 11 to fix the both. Notches 9a are formed in the lower box 9 respectively, and the upper box 10
Mesh-shaped windows 10a are respectively formed on the surfaces facing each other to secure the optical paths on the light emitting side and the light receiving side. The window 10a also prevents insects from entering and effectively acts as a cooling port in the housing in summer.

Inside the left and right lower boxes 9, a fan motor 13, an impeller 14, and a light bulb 15 as a housing heating means.
a and 15b are respectively provided. The fan motor 13 drives the impeller 14 to rotate,
a and 15b are driving loads of the fan motor 13. The fan motor 13 is configured not to start unless the first sensor 2 and the second sensor 3 are turned on for a predetermined time. The fan motor 13 rotates the air heated by the electric bulbs 15a and 15b to rotate the impeller 14 so as to rotate the upper box. The inside of the upper box 10 is blown and heated to melt the snow accumulated on or around the upper box 10 and to prevent erroneous detection of the sensor.

A silver sheet 16 is wound around the light emitting sensors 2a and 3a and the light receiving sensors 2b and 3b to prevent the heat generated by the light bulbs 15a and 15b from being heated. It is configured to efficiently heat the upper box 10. Also,
The light emitting sensors 2a and 3a and the light receiving sensors 2b and 3b
And a snow stopper pin 17 for stopping snow is provided upright on the downstream side of the roof 1 in the snowfall direction. This snow pin 1
Numeral 7 is provided to accurately detect snow by a sensor while maintaining the snow condition so that the snow on the roof 1 does not fall.

Next, the structure and operation of the control panel 6 will be described with reference to the wiring diagrams shown in FIGS. 25
Is a delay relay, which is connected to the load side with a predetermined delay even if the second sensor 3 is turned on. Reference numeral 26 is a power relay, which has a large drive load on the boiler 5a and the circulation pump 5
b, etc., to amplify the input signal and connect it.

Reference numeral 27 denotes a remaining snow timer, which drives the device on the load side for a predetermined time even if the second sensor 3 is turned off. Reference numeral 28 denotes an auxiliary relay for operating the remaining snow timer 27. 29 is a self-holding relay,
By setting the remaining snow timer 27, the second
Even if the sensor 3 is turned off, the operating state of the attic heating means such as the boiler 5a is maintained.

Reference numeral 30 denotes a temperature sensor, which controls the heating means of the attic such as the boiler 5a on the load side to a predetermined temperature or lower (for example, 5 ° C.).
C). The temperature sensor 30 functions as a main switch that is not connected to the load side when the temperature sensor 30 does not detect a predetermined temperature even when the delay relay 25 operates. By setting the temperature sensor 30 to an appropriate temperature, it is possible to prevent a malfunction such as a temperature drop during a non-snow season such as a summer season or an operation of an attic heating unit such as a boiler 5a caused by entry of birds and leaves. It also plays a role.

Reference numeral 31 is a compulsory input switch for switching whether the connection from the delay relay 25 or the auxiliary relay 28 to the load side is performed automatically or manually. Reference numeral 32 denotes a manual timer, which switches the forcible input switch 31 by setting a timer.

When the outside air temperature falls below 5 ° C., for example, FIG.
The relay r ₀ shown in is connected. In addition, when the amount of snowfall exceeds a predetermined amount, for example, 2 cm due to snowfall on the roof 1, the first
The sensor 2 is turned on, but is not connected to the load side.
When the snowfall further proceeds and the snowfall exceeds a predetermined amount, for example, 5 cm, the second sensor 3 is turned on. At this time, the electric bulbs 15a and 15b shown in FIG. 2 are turned on, the fan motor 13 is activated, the impeller 14 is rotated, and hot air is blown onto the upper box 10 to melt snow accumulated or attached to the surroundings.

When the second sensor 3 is turned on, the relay is delayed by a predetermined time (for example, 5 minutes) via the delay relay 25, and the relay r ₂ , the power relay 26, and the relay r ₃ are connected to the load side. , The boiler 5a and the circulation pump 5b are activated. Thereby, the light emitting sensors 2a, 3a and the light receiving sensors 2b, 3
Even if a foreign substance such as a bird enters between b and the snow blocks the light emitting surface or the light receiving surface due to snowstorm, the attic heating means such as the boiler 5a can be prevented from erroneously operating, and fuel costs can be saved.

When the remaining snow timer 27 is set, even if the second sensor 3 is turned off, the self-holding relay 29 holds the operating state of the attic heating means such as the boiler 5a and the snow is extinguished for a predetermined time. It becomes possible to carry out the snow removal operation according to the remaining snow condition and the weather condition.

Even if the snow-discharging operation of the snow accumulated on the roof 1 progresses and the second sensor 3 is turned off, the self-holding relay 29 keeps the operation state of the attic heating means such as the boiler 5a to perform the snow-discharging operation. Continuing, when the first sensor 2 is turned off, the self-holding relay 29 is reset, the connection to the load side is cut off, and the operation of the attic heating means such as the boiler 5a is stopped. Although it is assumed that snow remains on the roof 1 or the upper box 10 even when the first sensor 2 is turned off, the snow can be sufficiently eliminated by residual heat of the pipe mat 4 or the like.

According to the above construction, the first sensor 2 and the second sensor 3 which photoelectrically detect snowfall and have different heights are O.
When the control panel 6 detects that the snow on the roof 1 has reached a predetermined amount, the control panel 6 operates the boiler 5a and the circulation pump 5b to start the snow removal operation of the snow on the roof 1. When the snow removal on the roof 1 progresses and the second sensor 3 is turned off and the first sensor 2 is turned off and it is detected that the snowfall falls below a predetermined amount, the driving of the boiler 5a and the like is stopped. Therefore, regardless of the weather conditions such as snow quality, the snow on the roof is accurately detected,
Complete snow removal is possible with the minimum required fuel cost.

Further, as a snow accumulation detecting means, a fan motor 13, an impeller 14 and a light bulb 1 are provided in the lower box 9 and the upper box 10 on the left and right.
When the control panel 6 detects snow cover by the first sensor 2 and the second sensor 3, the control panel 6
5a and 15b are turned on, the fan motor 13 is operated to melt the snow attached to the peripheral surface of the upper box 10, and then the boiler 5a and the circulation pump 5b are operated to start the snow removal operation of the snow on the roof 1. . When the connection between the second sensor 3 and the first sensor 2 is sequentially disconnected, the operation of the housing heating means such as the fan motor 13 and then the operation of the attic heating means such as the boiler 5a are sequentially stopped. As a result, it is possible to improve the reliability of the sensor by melting the snow adhering to the peripheral surface of the housing due to a snowstorm or the like and block the optical path of the sensor, improve the reliability of the sensor, and accurately detect the snow accumulation and snow removal on the roof. It is possible to perform a snow removal operation without wasting fuel.

By operating the attic heating means such as the boiler 5a with a delay of a predetermined time via the delay relay 25, foreign matter such as birds enter between the first and second sensors 2 and 3. However, it is possible to prevent the attic heating means from erroneously operating.

Further, since the attic heating means is not operated unless the temperature detected by the temperature sensor 30 becomes lower than a predetermined temperature, the attic heating means is automatically activated when the preset snowfall temperature is reached. It is possible to put it in an operable state, and it is possible to save fuel cost and improve operability.

Further, even if the second sensor is turned off by setting the remaining snow timer, the control means maintains the operating state of the attic heating means by itself to remove snow for a predetermined time, so that the amount of snow on the roof can be reduced. Alternatively, the snow erasing operation can be performed according to the snowfall situation.

Next, a more detailed structure of the roof 1 shown in FIG. 1 will be described with reference to FIG. A support plate 19 for fixing each galvanized iron plate 1a is provided on the roof substrate 18 of the roof 1 at predetermined intervals in the lateral direction. Further, the galvanized iron plate 1 is bridged on the support plate 19.
By fixing a, a space portion 1b is formed between the galvanized iron plate 1a and the roof substrate 18. In addition, the roof substrate 1
A silver mat 19 having silver sheets attached to both sides of a cushioning material such as an air cap is laid on the roof 8 so as to cover at least the roof substrate 18 in the space 1b. A pipe mat 4 having a plurality of pipe lines for circulating an antifreeze liquid on the silver mat 19 of the space 1b.
Are laid in accordance with the pitch of the thatch of the galvanized iron plate 1a. When the roof 1 is constructed, after the silver mat 19 is laid on the roof substrate 18, the support plate 20 is used.
Are arranged at a predetermined interval, and the pipe mat 4 is laid between the adjacent support plates 20, and the galvanized iron plate 1a is further bent and fixed according to the interval between the support plates 20 and laid in a side-roof (one-letter-roof). Build. Compared with the vertical roofing, the horizontal roofing of the roof 1 is effective in that the melted snow is less likely to adhere to the galvanized iron plate 1a and is easily slipped off to cause no residual snow.

The silver mat 19 has a heat insulating effect, and since the excess heat is not transferred from the pipe mat 4 to the roof substrate 18, it is efficiently transferred to the galvanized sheet 1a side.
In addition, it plays a role of preventing the roof substrate 18 from being burned from the galvanized sheet 1a side in the summer. Further, as the pipe mat 4, a rubber mat having a thickness of about 2 to 3 mm is preferably used, and is laid in accordance with the lateral pitch of the galvanized iron plate 1a. In this way, the pipe mat 4 is relatively thick and is arranged in the roof where it is not exposed to ultraviolet rays, so that it has excellent pressure resistance and durability.

FIG. 6 shows the flow path and flow direction of the antifreeze liquid flowing through the pipe mat 4 arranged on the roof 1. The antifreeze liquid supplied from the boiler 5a alternately flows through the pipe lines 4a and 4b of the pipe mat 4 which are adjacent to each other. Specifically, the antifreeze liquid supplied from the boiler 5a flows into the pipe line 4a of each pipe mat 4 from the forward pipe 21, and returns to the return pipe 2 from the pipe line 4b.
It is configured to flow into the boiler 2 and return to the boiler 5a. As a result, the temperature distribution on the heating surface of the pipe mat 4 can be averaged, and snow can be uniformly extinguished.

Further, as shown in FIG. 7 (a), each pipe mat 4 has a conduit 4a, which is perpendicular to the rainwater flow.
It is arranged so that the pitch of 4b is 200 mm to 300 mm. There is a possibility that residual snow A will occur between the pipe mats 4 as indicated by the diagonal lines, but since the roof 1 is a thatch, when the snow starts to melt, it falls along the slope of the roof 1 and heats up the pipe mat 4. Since it moves to the area, snow can be efficiently removed. That is, in the case of a thatched roof,
Even if the pipe mat 4 is not laid on the entire surface of the roof, the same effect as laying it on the entire surface can be obtained, so that the manufacturing cost can be reduced.

On the other hand, as shown in FIG. 7 (b), when the roof 1 is a vertically-roofed roof, the snow accumulated between the pipe mats 4 does not disappear, and since it is difficult for the snow to fall, the amount of remaining snow increases and the snow disappears. Becomes less efficient. In addition, the pipe mat 4 is likely to be slid below the inclined surface and easily bent on the side of the eaves, making it difficult to achieve complete snow removal.

Further, the pipe lines 4a, 4b for circulating the antifreeze liquid
The heat pipe 4c as one set may be laid on the bottom of the gutter 23 provided adjacent to the roof 1 as shown in FIG. In this case, it is possible to prevent the thaw water in the gutter 23 from freezing and the drainage efficiency from being deteriorated.

As shown in FIG. 9, an angle member 24 having an L-shaped cross section is provided at a predetermined position on the galvanized iron plate 1a of the roof 1 to prevent snowfall during snow melting. The angle member 24 is important for preventing snow from unexpectedly falling and ensuring safety when performing a snow erasing operation, especially when the house is crowded. Since the angle member 24 receives the snow when it falls off along the inclined surface of the roof 1 when the snow cover of the roof is thawed, the snow easily adheres and accumulates, and the snow mass B increases as the snow melting progresses. When there is a large amount of snow, it becomes difficult to erase the snow by connecting to the snow mass B accumulated in the nearby angle member 24.

Therefore, by laying a heat pipe 4c on each surface of the angle member 24 and circulating the antifreeze liquid, it is possible to effectively remove the snow mass B of the snow clogged by the angle member 24. Become. Further, as shown in FIG. 10, by laying the pipe mat 4 arranged on the roof 1 closely at the eaves of the roof and near the angle member 24 for preventing snowfall, the melted snow moves on the roof surface. By doing so, it is possible to intensively heat areas that tend to accumulate and effectively remove snow.

During the snowfall, the water temperature of the return pipe 22 returning to the boiler 5a for melting the snow is usually as low as around 18 ° C.
However, the amount of snowfall has decreased, and the roof surface can be seen in places during long-term snowfall.
In this way, when there is no snow on the entire roof surface, but when there is some remaining snow, the water temperature in the return pipe 22 gradually rises. Therefore, the water temperature is 20 to save energy.
The antifreeze solution is circulated through the pipe mat 4 by the circulation pump 5b while the temperature of the boiler 5 is controlled by turning off the switch of the boiler 5 so that the temperature does not greatly exceed ° C. As a result, fuel cost can be saved by intermittently operating the boiler 5a that has been combusted in continuous operation together with the circulation pump 5b.

The attic heating means uses a pipe mat 4 having a plurality of pipe lines 4a and 4b for circulating antifreeze liquid on a silver mat 19 laid on the attic of a thatched roof in a thatched pitch. Depending on the laying together, since the roof 1 is a thatch, it is easy for snow to fall along the slope of the roof, and even if the pipe mat 4 is not laid on the entire surface of the roof 1 Since it is moved to, snow can be efficiently removed at low cost.

Further, the conduits 4a, 4 of the pipe mat 4 are
By alternately circulating the heated antifreeze liquid in b, the temperature distribution of the roof 1 can be averaged, and the snow can be completely extinguished without producing residual snow.

In the pipe mat 4, the eaves of the roof 1 and the angle material 24 for preventing snowfall are laid closely so that the melted snow moves on the roof surface and concentrates on the places where the snow easily collects. Can be effectively heated to remove snow.

The angle member 2 provided on the roof 1
The angle member 24 that has received the snowfall by arranging the heat pipe 4c that alternately circulates the antifreeze liquid in FIG.
It is possible to remove the snow accumulated in.

The present invention is not limited to the embodiments described above, and it goes without saying that other modifications can be made without departing from the spirit of the invention.

[0050]

As described above, according to the present invention, when the snow detection means detects that the snow on the roof has reached a predetermined amount in a stepwise manner, the control means first activates the housing heating means to activate the housing peripheral surface. The snow attached to the roof is melted, and then the attic heating means is activated to start the snow removal operation of the snow cover on the roof, and when the snow removal of the snow cover progresses and gradually falls below a predetermined amount, the housing heating means and the attic heating means Control is performed so as to stop driving sequentially. Therefore, the snow on the roof can be accurately detected irrespective of weather conditions such as snow quality and snowstorm, and complete snow removal can be performed with a minimum necessary fuel cost.

In addition, by laying a pipe mat having a plurality of pipe lines for circulating antifreeze liquid on a silver mat laid on the attic of a horizontal thatched roof in accordance with the pitch of the thatched roof, the roof may be horizontal. Since it is thatched, the snow melt easily slips down along the slope of the roof and moves to the heating area of the pipe mat, so that snow can be efficiently extinguished at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a roof.

FIG. 2 is a perspective view of first and second sensors.

FIG. 3 is a wiring diagram of the entire snow removal device.

FIG. 4 is a wiring diagram of a control panel.

FIG. 5 is a partially cutaway plan view and side view of the roof.

FIG. 6 is a schematic diagram showing a flow path and a flow direction of an antifreeze liquid flowing through a pipe mat.

FIG. 7 is a comparative explanatory view showing a snow-removed state of a horizontal thatched roof and a thatched roof.

FIG. 8 is an explanatory diagram when a pipe is laid in a rain gutter.

FIG. 9 is an explanatory diagram when a pipe is laid on the angle.

FIG. 10 is an explanatory diagram showing a laid state of a pipe mat laid on the roof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1-Roof 1a-galvanized iron plate 2,3-First and second sensors 2a, 3a-Light emitting sensor 2b, 3b-Light receiving sensor 3c-Partition plate 4-Pipe mat 4a, 4b-Pipe 4c-Heat pipe 5a-Boiler 5b-circulation pump 6-control panel 7-screw rod 8-nut 9-lower box 9a-notch 10-upper box 10a-window 11-screw hole 12-screw 13-fan motor 14-impeller 15a, 15b-light bulb 16 ─ Silver sheet 17 ─ Snow stop pin 18 ─ Roof substrate 19 ─ Silver mat 20 ─ Support plate 21 ─ Outgoing pipe 22 ─ Return pipe 23 ─ Rain gutter 24 ─ Angle material 25 ─ Delay relay 26 ─ Power relay 27 ─ Snow remaining timer 28 ─ Auxiliary relay 29-Self-holding relay 30-Temperature sensor 31-Forced input switch 32-Manual timer

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[Procedure amendment]

[Submission date] December 8, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Snow removing device for roof

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow removal device for a roof, and more particularly, to a housing heating unit and an attic heating unit when snow on a roof advances and a snow detection unit detects a predetermined amount in a stepwise manner. The present invention relates to a roof snow removal device that operates sequentially to remove snow from a roof.

[0002]

2. Description of the Related Art Conventionally, as a snow removal device for heating the back surface of a roof by a heating means to remove snow on the roof, for example,
As shown in Japanese Patent Publication No. 1-21309, there is a roof snow removal device developed by the present applicant. This includes snowfall detection means in which the tray moves up and down due to the weight of snowfall, and snowfall detection means for detecting the presence or absence of snowfall on the roof with an electrode short-circuited with electrolyzed water. When continuously operated, the heating means is operated to start snow removal on the roof and the pan, and the heating is stopped when the electrode of the snow detection means is opened. This allows
It is an object of the present invention to provide a snow removal device for a roof that can completely eliminate snow without remaining snow, with the minimum necessary fuel cost.

[0003]

However, the above conventional snow removing device for a roof has the following first problem. That is, due to the recent warming trend of winter, the number of days when heavy and wet snow falls during winter has increased. Especially when the snow begins to fall during the first snow or on a day when the temperature is relatively high, since the snow is wet snow, the snowfall detection means detects the snowfall with the weight of a small amount of snow on the saucer and activates the heating means. There is a problem that the heating means is operated more than necessary because the heating operation is performed with little or no snow accumulation, even if there is little snow accumulation. On the other hand, if snow falls on a cold day, it is light powder snow,
Since there is a considerable amount of snow on the saucer and the roof, the snowfall detecting means detects the snow and activates the heating means, so that the operation of the heating means varies. Further, when the operation of the heating means is stopped, it is performed by detecting that the electrode of the snow removal detecting means which is short-circuited by the melting water is in an open state. The upper remaining snow tends to be uneven, and if unevenness occurs, the electrode is opened and the heating means stops even if there is remaining snow, or the heating means operates even when there is almost no snow accumulation, and the heating means There is also a variation in the stoppage. In addition, since the flow of water that has melted snow is not uniform, it is often difficult or impossible to detect the flow of water accurately because it is detected or not depending on the position of the snow removal detecting means on the roof. . Therefore, since the operation and the stop of the heating means vary, there is a possibility that the fuel cost is wasted.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to accurately detect snow cover on a roof regardless of weather conditions such as snow quality and to completely eliminate snow with a minimum necessary fuel cost. It is to provide a snow removal device.

[0005]

In order to solve the above problems, the present invention has the following constitution. That is, a snow cover detecting means for detecting snow cover on the roof provided with first and second sensors having different heights for photoelectrically detecting the snow cover, and heating from the back side of the roof to erase the snow cover on the roof. Attic heating means for detecting, when the first and second sensors detect that the snow on the roof has advanced and reached a predetermined amount, the attic heating means is activated to start snow removal on the roof, And control means for controlling to stop driving of the attic heating means when the second and first sensors detect that the snow on the roof has advanced to a predetermined amount and the snow has fallen below a predetermined amount.

According to the above arrangement, when the first sensor and the second sensor, which have different heights for photoelectrically detecting snow, detect that the amount of snow on the roof has reached a predetermined amount, the control means controls the attic heating means. The attic heating means is activated to start the snow-discharging operation of the snow on the roof, and when the snow-discharging of the roof progresses and the second sensor and the first sensor are disconnected and the snow falls below a predetermined amount, the attic heating means is detected. The drive is controlled to stop.

When the snow detecting means includes a housing heating means which is housed in a housing and heats the housing, when the control means detects snow by the first sensor and the second sensor, first, The housing heating means is operated to dissolve the snow adhering to the peripheral surface of the housing, and then the attic heating means is operated to start the snow removal operation of the snow on the roof, and the connection of the second sensor and the first sensor is sequentially performed. When cut, the housing heating means,
The operation of the attic heating means is sequentially stopped.

In addition, after the first sensor and the second sensor sequentially detect the snow cover, the attic heating means is operated with a predetermined time delay via a delay relay to operate the attic heating means. Even if a foreign substance such as a bird enters, it is possible to prevent the attic heating means from erroneously operating.

Further, the attic heating means is not operated unless the temperature detected by the temperature sensor becomes lower than a predetermined temperature, so that the attic heating means can be automatically operated when a predetermined snowfall temperature is reached. can do.

[0010] Further, the control means performs self-maintenance of the operation state of the attic heating means and performs snow removal for a predetermined time even if the second sensor is turned off by setting of the remaining snow timer. Alternatively, a snow removing operation according to a snowfall situation can be performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a longitudinal sectional view of the roof, FIG. 2 is a perspective view of the first and second sensors, FIG. 3 is a wiring diagram of the entire snow removal device, and FIG. 4 is a wiring diagram of a control panel.

First, a schematic configuration of a snow removal device for a roof will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a roof, which is laid on a horizontal roof (single-character roof) in which a plurality of strip-shaped galvanized steel plates 1a are laid in the longitudinal direction without any gap.
Reference numerals 2 and 3 denote first and second different heights as snow detecting means.
Sensors are provided on the galvanized plate 1a, on the light emitting side and the light receiving side, respectively, for photoelectrically detecting snow cover. Reference numeral 4 denotes a pipe mat laid on the back side of the roof 1 in accordance with the horizontal roof pitch of the galvanized sheet 1a. The pipe mat 4 is formed with a plurality of pipes for circulating an antifreeze (such as ethylene glycol).
A pipe mat 4 is always arranged below the galvanized plate 1a provided with the first and second sensors 2 and 3. Reference numeral 5a denotes a boiler, which heats an antifreeze heated to a predetermined temperature in a pipe formed in the pipe mat 4.
The antifreeze heated by the boiler 5a is circulated in the pipe mat 4 via the outward pipe 21 and the return pipe 22 by the circulation pump 5b. Reference numeral 6 denotes a control panel as control means, which operates so as to ignite the boiler 5a when the first and second sensors 2 and 3 are turned on for a predetermined time and to feed the heated antifreeze into the pipe mat 4 by the circulation pump 5b. Control. The boiler 5a, the circulation pump 5b, the pipe mat 4, the outgoing pipe 21, and the return pipe 22 constitute attic heating means. Reference numeral 24 denotes an angle member for preventing snow accumulated on the roof 1 from falling on the ground, and the angle member 24 is also provided with a heat pipe 4c for circulating antifreeze.

Next, the configuration of the first and second sensors 2 and 3 will be described with reference to FIG. The first and second
The sensors 2 and 3 are provided on any galvanized iron plate 1a of the roof 1
The light emitting sensor 2 is disposed at a predetermined distance
a, 3a and light receiving sensors 2b, 3b.
The first sensor 2 is, for example, about 2 cm taller than the roof 1.
In addition, the second sensor 3 is screwed onto the screw rod 7 so as to have a height of about 5 cm, and is fixed by nuts 8 at the top and bottom respectively. The heights of the first and second sensors 2 and 3 can be set arbitrarily. Of the light emitting sensors 2a and 3a arranged in the upper and lower two stages, a partition plate 3c is provided on the lower surface of the upper light emitting sensor 3a so that light emitted from each other does not interfere on the light receiving side. Further, the light emitting sensors 2a, 3a and the light receiving sensor 2b,
3b are housed in lower boxes 9 provided on the left and right sides, and are respectively covered by upper boxes 10 serving as housings. After covering the upper box 10 with the lower box 9, the screw 1 is inserted into the screw hole 11.
The two are fitted so as to fix them.
Notches 9a are respectively formed in the lower box 9, and mesh windows 10a are formed in opposing surfaces of the upper box 10, respectively, to secure light paths on the light emitting side and the light receiving side. In addition, this window 10a prevents entry of insects and the like,
Works effectively as a cooling port in the housing during the summer.

A fan motor 13 as a housing heating means, an impeller 14, and a light bulb 15
a and 15b are respectively provided. The fan motor 13 drives the impeller 14 to rotate,
a and 15b are driving loads of the fan motor 13. The fan motor 13 is configured not to start unless the first sensor 2 and the second sensor 3 are turned on for a predetermined time. The fan motor 13 rotates the air heated by the electric bulbs 15a and 15b to rotate the impeller 14 so as to rotate the upper box. The inside of the upper box 10 is blown and heated to melt the snow accumulated on or around the upper box 10 and to prevent erroneous detection of the sensor.

A silver sheet 16 is wrapped around the light emitting sensors 2a, 3a and the light receiving sensors 2b, 3b, and reflects heat generated by the light bulbs 15a, 15b to prevent heating of the sensors. The upper box 10 is configured to be efficiently heated. Also,
The light emitting sensors 2a and 3a and the light receiving sensors 2b and 3b
And a snow stopper pin 17 for stopping snow is provided upright on the downstream side of the roof 1 in the snowfall direction. This snow pin 1
Numeral 7 is provided to accurately detect snow by a sensor while maintaining the snow condition so that the snow on the roof 1 does not fall.

Next, the configuration and operation of the control panel 6 will be described with reference to the wiring diagrams shown in FIGS. 25
Is a delay relay, which is connected to the load side with a predetermined delay even if the second sensor 3 is turned on. Reference numeral 26 is a power relay, which has a large drive load on the boiler 5a and the circulation pump 5
b, etc., to amplify the input signal and connect it.

Reference numeral 27 denotes a remaining snow timer for driving the load-side device for a predetermined time even if the second sensor 3 is turned off. Reference numeral 28 denotes an auxiliary relay for operating the remaining snow timer 27. 29 is a self-holding relay,
By setting the remaining snow timer 27, the second
Even if the sensor 3 is turned off, the operating state of the attic heating means such as the boiler 5a is maintained.

Numeral 30 denotes a temperature sensor which operates attic heating means such as a boiler 5a on the load side at a predetermined temperature or lower (for example, 5 °).
C). The temperature sensor 30 functions as a main switch that is not connected to the load side when the temperature sensor 30 does not detect a predetermined temperature even when the delay relay 25 operates. By setting the temperature sensor 30 to an appropriate temperature, it is possible to prevent a malfunction such as a temperature drop during a non-snow season such as a summer season or an operation of an attic heating unit such as a boiler 5a caused by entry of birds and leaves. It also plays a role.

Reference numeral 31 is a forced input switch, which switches whether the connection from the delay relay 25 or the auxiliary relay 28 to the load side is performed automatically or manually. Reference numeral 32 denotes a manual timer, which switches the forcible input switch 31 by setting a timer.

When the outside temperature falls below 5 ° C., for example, FIG.
The relay r ₀ shown in is connected. In addition, when the amount of snowfall exceeds a predetermined amount, for example, 2 cm due to snowfall on the roof 1, the first
The sensor 2 is turned on, but is not connected to the load side.
When the snowfall further proceeds and the snowfall exceeds a predetermined amount, for example, 5 cm, the second sensor 3 is turned on. At this time, the electric bulbs 15a and 15b shown in FIG. 2 are turned on, the fan motor 13 is activated, the impeller 14 is rotated, and hot air is blown onto the upper box 10 to melt snow accumulated or attached to the surroundings.

When the second sensor 3 is turned on, the relay r ₂ , the power relay 26, and the relay r ₃ are connected to the load by delaying a predetermined time (for example, 5 minutes) via the delay relay 25. , The boiler 5a and the circulation pump 5b are activated. Thereby, the light emitting sensors 2a, 3a and the light receiving sensors 2b, 3
Even if a foreign substance such as a bird enters between b and the snow blocks the light emitting surface or the light receiving surface due to snowstorm, the attic heating means such as the boiler 5a can be prevented from erroneously operating, and fuel costs can be saved.

When the remaining snow timer 27 is set, even if the second sensor 3 is turned off, the operation state of the attic heating means such as the boiler 5a is held by the self-holding relay 29 to remove snow for a predetermined time. Can be performed, and a snow removal operation according to a remaining snow state or a weather state can be performed.

Even if the second sensor 3 is turned off due to the progress of the snow removal operation of the snow accumulated on the roof 1, the operation state of the attic heating means such as the boiler 5a is held by the self-holding relay 29 to carry out the snow removal operation. When the first sensor 2 is turned off, the self-holding relay 29 is reset, the connection to the load side is cut off, and the operation of the attic heating means such as the boiler 5a is stopped. Although it is assumed that snow remains on the roof 1 or the upper box 10 even when the first sensor 2 is turned off, the snow can be sufficiently eliminated by residual heat of the pipe mat 4 or the like.

According to the above configuration, the first sensor 2 and the second sensor 3 having different heights for photoelectrically detecting snow cover are O
When the control panel 6 detects that the snow on the roof 1 has reached a predetermined amount, the control panel 6 operates the boiler 5a and the circulation pump 5b to start the snow removal operation of the snow on the roof 1. When the snow removal on the roof 1 progresses and the second sensor 3 is turned off and the first sensor 2 is turned off and it is detected that the snowfall falls below a predetermined amount, the driving of the boiler 5a and the like is stopped. Therefore, regardless of the weather conditions such as snow quality, the snow on the roof is accurately detected,
Complete snow removal is possible with the minimum required fuel cost.

As means for detecting snow accumulation, a fan motor 13, an impeller 14, and a light bulb 1 are provided in the lower box 9 and the upper box 10 on the left and right.
When the control panel 6 detects snow cover by the first sensor 2 and the second sensor 3, the control panel 6
5a and 15b are turned on, the fan motor 13 is operated to melt the snow attached to the peripheral surface of the upper box 10, and then the boiler 5a and the circulation pump 5b are operated to start the snow removal operation of the snow on the roof 1. . When the connection between the second sensor 3 and the first sensor 2 is sequentially disconnected, the operation of the housing heating means such as the fan motor 13 and then the operation of the attic heating means such as the boiler 5a are sequentially stopped. As a result, it is possible to improve the reliability of the sensor by melting the snow adhering to the peripheral surface of the housing due to a snowstorm or the like and block the optical path of the sensor, improve the reliability of the sensor, and accurately detect the snow accumulation and snow removal on the roof. It is possible to perform a snow removal operation without wasting fuel.

By operating the attic heating means such as the boiler 5a with a delay of a predetermined time via the delay relay 25, foreign substances such as birds enter between the first and second sensors 2 and 3. However, it is possible to prevent the attic heating means from erroneously operating.

In addition, depending on the construction in which the attic heating means is not operated unless the temperature detected by the temperature sensor 30 becomes lower than the predetermined temperature, the attic heating means is automatically turned on when a preset snowfall temperature is reached. It can be put into an operable state, which can save fuel cost and improve operability.

In addition, even if the second sensor is turned off by the setting of the remaining snow timer, the control means self-holds the operating state of the attic heating means and performs snow removal for a predetermined time, whereby the snow accumulation amount on the roof can be increased. Alternatively, a snow removing operation according to a snowfall situation can be performed.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that other modifications can be made without departing from the spirit of the invention.

[0030]

As described above, according to the present invention, when the snow detection means detects that the snow on the roof has reached a predetermined amount in a stepwise manner, the control means first activates the housing heating means to activate the housing peripheral surface. The snow attached to the roof is melted, and then the attic heating means is activated to start the snow removal operation of the snow cover on the roof, and when the snow removal of the snow cover progresses and gradually falls below a predetermined amount, the housing heating means and the attic heating means Control is performed so as to stop driving sequentially. Therefore, the snow on the roof can be accurately detected irrespective of weather conditions such as snow quality and snowstorm, and complete snow removal can be performed with a minimum necessary fuel cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a roof.

FIG. 2 is a perspective view of first and second sensors.

FIG. 3 is a wiring diagram of the entire snow removal device.

FIG. 4 is a wiring diagram of a control panel.

[Explanation of symbols] 1-roof 1a-galvanized iron plate 2,3-first and second sensors 2a, 3a-light-emitting sensor 2b, 3b-light-receiving sensor 3c-partition plate 4-pipe mat 5a-boiler 5b-circulation pump 6 -Control panel 7-Screw rod 8-Nut 9-Lower box 9a-Notch 10-Upper box 10a-Window 11-Screw hole 12-Screw 13-Fan motor 14-Impeller 15a, 15b-Light bulb 16-Silver sheet 17- Snow stop pin 25-delay relay 26-power relay 27-remaining snow timer 28-auxiliary relay 29-self-holding relay 30-temperature sensor 31-forced input switch 32-manual timer

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 4

[Fig. 2]

[Figure 3]

Claims (10)

[Claims] 1. A snow detection means for detecting snow cover on a roof, comprising first and second sensors having different heights for photoelectrically detecting snow cover; Attic heating means for erasing snow cover, and when the first and second sensors detect that snow on the roof has advanced and reached a predetermined amount, the attic heating means is activated to start snow removal on the roof. And control means for controlling to stop the operation of the attic heating means when the second and first sensors detect that the snow on the roof has advanced and the snowfall has fallen below a predetermined amount. Roof snow removal equipment. 2. The snow accumulation detecting means includes a housing heating means housed in a housing to heat the housing, and the control means heats the housing when stepwise snow is detected by the first sensor and the second sensor. 7. The operation of the housing heating means and the attic heating means is sequentially stopped when the means and the attic heating means are operated in sequence and the connection of the second sensor and the first sensor is cut off in sequence due to the progress of snow removal. 1. The snow removing device for the roof according to 1. 3. The control means activates the attic heating means with a predetermined time delay via a delay relay after the first sensor and the second sensor detect snowfall in sequence. The snow removing device for a roof according to claim 2. 4. The control means self-holds the operating state of the attic heating means and removes snow for a predetermined time even if the second sensor is turned off by setting a remaining snow timer. The snow removing device for a roof according to claim 2 or claim 3. 5. The control means does not operate the attic heating means unless the temperature detected by the temperature sensor falls below a predetermined temperature, claim 1, claim 2, claim 3, or claim. 4. The snow removing device for the roof described in 4. 6. A horizontal thatched roof in which a plurality of strip-shaped galvanized iron sheets whose lengthwise direction is laid on the upper side of the roof substrate are closed without gaps. A support plate for fixing each galvanized iron plate, a space portion formed between the galvanized iron plate and the roof substrate by fixing the galvanized iron plate on the support plate in a bridging state, and a roof of at least the space portion A silver mat laid so as to cover the substrate, and a pipe mat provided with a plurality of pipe lines for circulating the antifreeze liquid, which is laid in accordance with the pitch of the thatching of the galvanized iron plate on the silver mat in the space portion, A thatched roof that is equipped with it. 7. The thatched roof according to claim 6, wherein the antifreeze liquid heated by the attic heating means is alternately circulated in the pipeline of the pipe mat. 8. The thatched roof according to claim 6 or 7, wherein the pipe mat is laid closely at the eaves of the roof and near the angle for preventing snowfall. 9. The horizontal thatched roof according to claim 8, wherein a pipe that alternately circulates the antifreeze liquid heated by the attic heating means is laid on the angle provided on the roof. 10. A gutter provided adjacent to the roof,
7. A pipe is laid to alternately circulate the antifreeze liquid heated by using the attic heating means.
The thatched roof according to claim 7, claim 8 or claim 9.