JPH09100650A - Snow melting method of membrane structure roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and effectively melt snow on a room by heat generated by induction heating by moving a carriage on which an electromagnetic wave generator is mounted along a guide rail parallel to a locus on the side of a membrane roof top part. SOLUTION: Between support brackets 4 suspended from a support frame 2 a pair of guide rails 5 parallel to a locus on the side of top part 3a of a membrane roof 3 is provided, and a carriage 6 on which an electromagnetic wave generator 7 is mounted is arranged to be movable. The carriage 6 is moved with the electromagnetic wave generator 7 driven and the electromagnetic wave is transmitted to snow A near the top part 3a having a relatively moderate inclination through a wave-guide 8 to generate internal oscillations, and with the heat generated the snow A is melted. The energy of the electromagnetic wave is alomost consumed for melting the snow, and the temp. does not rise so much, thereby ensuring safety. When a heat bridge is formed even if a snow cave is generated, no heat loss caused thereby does not occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting method applied to a membrane-structured roof surface used in large space buildings.

[0002]

2. Description of the Related Art If there is snow on a membrane structure roof used in a large-scale building, leaving it as it is will cause the building to collapse and cause long-term deterioration. Therefore, for example, in Japanese Examined Patent Publication (Kokoku) No. 5-78735, a plurality of structural frame pipes are provided with hot air outlets, and hot air from a blower is blown to the roof surface through the structural frame pipes to melt snow. Is disclosed.

[0003]

However, this device has a problem that if the structural frame pipes are arranged at large intervals, snow cannot be melted at an intermediate position.

Further, in particular, as shown in FIG.
On the surface where the warm air is blown from, the snow A is sufficiently melted and becomes water and flows out, but it does not melt around it and the bottom of the snow,
That is, the snow melting is uneven in the portion in contact with the surface of the membrane roof 12, and a tunnel-shaped snow tunnel A2 is formed.
Then, on the upper surface of the snow cave, the snow layer with heat insulation becomes thin, the heat insulation is weakened, and the heat transmission coefficient increases. Therefore, a large amount of heat flows to the outside (outdoor) through the portion having a large heat transmission coefficient, that is, the heat bridge A1. Thus, the heat of the warm air from the nozzles is radiated to the atmosphere as it is without melting the snow, resulting in a loss of heat, it takes time to melt the snow, and the snow melting efficiency decreases. It was

As another snow melting device, for example, JP-A-62-62
Japanese Patent Laid-Open No. 197502 discloses a snow melting device configured by connecting a linear or plate-shaped heat derivative to an electromagnetic wave heating device. However, this heating device heats the heat conductor and melts the snow accumulated around it with the heat,
The heating principle is somewhat similar to the present invention in that it uses electromagnetic waves, but it is the same as the above-mentioned hot air blowing in that it heats other substances to a high temperature and transfers this heat to snow. However, there was a drawback in that it also affected the roof material.

[0006] The present invention is to solve the above problems, a snow melting method for a membrane structure roof, which is capable of efficiently melting snow without causing a snow cave phenomenon and without affecting the roof material. Is intended to provide.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention comprises melting snow on the top of a roof membrane in a dome-shaped membrane structure roof, In the method of excluding the snow, an electromagnetic wave generator is made to face the lower part of the roof membrane, and the snow is melted by dielectric heating of the electromagnetic wave emitted from the electromagnetic wave generator.

Therefore, the electromagnetic waves that have passed through the roof membrane generate thermal energy by vibrating the snow molecules accumulated on the surface, thereby melting the entire reach of the electromagnetic waves.

According to a second aspect of the present invention, a guide for the electromagnetic wave generator is provided inside the roof membrane near the top, and the electromagnetic wave generator is movably arranged along the guide. As a result, even if the electromagnetic wave generator is small and the irradiation range is small, it is possible to cover the entire region where snow is easily caused by movement.

[0010]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a building having a roof structure membrane to which the present invention is applied. On a building foundation 1 constructed on a ground plane GL, a lattice type support frame 2 is constructed in an arch shape, A membrane roof 3 is stretched over the support frame 2 and covers the entire building. In this structure, the portion 3a near the top of the membrane roof 3 has a relatively gentle slope, and the snow A that has fallen on this portion 3a accumulates as it is and presses against the membrane roof 3. Further, since the peripheral portion 3b has a steep slope, the snow A is likely to slide down around the building.

Therefore, in the present invention, the portion 3 near the top is
The snow melting target is a, and the snow melting device is arranged in this portion.

The snow melting device is arranged between the support brackets 4 suspended on the support frame 2 and is movable along the pair of guide rails 5 parallel to the locus on the top side of the membrane roof 3. Trolley 6 placed in the
It is composed of an electromagnetic wave generator 7 fixed on the top.

The electromagnetic wave generator 7 is not shown in the figure.
A magnetron or the like for generating electromagnetic waves in a wavelength band of about 5 GHz is built in, and the opening surface of the waveguide 8 which is an emission port for electromagnetic waves provided on the top of the magnetron is close to and facing the film roof 3. .

FIG. 2 shows a cross section taken along the line EE of FIG. In the figure, the membrane roof 3 is a double membrane, and each is made of an electromagnetic wave permeable material such as a glass fiber sheet coated with tetrafluoroethylene resin.

Therefore, by moving the carriage while driving the electromagnetic wave generator 7, the snow A facing the waveguide 8 through the membrane roof 3 at the passing position thereof receives internal electromagnetic waves by receiving the electromagnetic waves. It rises and the heat melts snow. Therefore, most of the energy of the electromagnetic waves is consumed by the snowmelt and the temperature does not rise so much, and even if a snow tunnel is formed and a heat bridge is formed, heat loss due to this is not generated.

For example, as shown in FIG. 3, a guide rail is not provided, and the electromagnetic wave generator is loaded on a worker at a high place,
As a result, the snow may be melted, and according to this method, it can be used as an auxiliary device of a conventional warm air blowing type snow melting device.

[0018]

As described above in detail with reference to the embodiments, the invention according to claim 1 of the present invention is as follows.
Electromagnetic waves transmitted through the roof membrane generate thermal energy by vibrating the snow accumulated on the surface by its dielectric heating, which improves snow melting efficiency and heats the membrane roof and other members that make up the roof surface. It is safe because it heats only the snow directly without transmitting heat.

In the invention according to claim 2 of the present invention, there is an advantage that even if the electromagnetic wave generator is small and the irradiation range is small, it is possible to cover the entire region where snow is easily caused by movement.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a building having a roof structure film to which the method of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view taken along line ii in FIG.

FIG. 3 is an explanatory diagram showing a working state.

FIG. 4 is an explanatory sectional view showing a problem in a conventional snow melting device.

[Explanation of symbols]

 3 Membrane roof 5 Guide rail 7 Electromagnetic wave generator 8 Waveguide

Claims (2)

[Claims] 1. A method for melting and removing snow from the top of a roof membrane in a dome-shaped membrane structure building, wherein an electromagnetic wave generator is faced to a lower portion of the roof membrane, and the electromagnetic wave generator is provided. By the dielectric heating of the electromagnetic waves emitted from
A snow melting method for a membrane roof characterized by melting snow. 2. The membrane structure according to claim 1, wherein a guide of the electromagnetic wave generator is provided inside a top portion of the roof membrane, and the electromagnetic wave generator is movably arranged along the guide. How to melt snow on the roof.