JPH0443546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing snow from the roof surface of a large space building with a membrane roof, such as a sports facility, constructed in an area with heavy snowfall.

[Conventional technology]

Recently, large buildings with membrane roofs are often constructed as sports facilities, meeting places, etc. even in areas with heavy snowfall.

[Problem to be solved by the invention]

However, when constructing a large space building with a membrane roof in an area with heavy snowfall, measures to remove snow from the roof surface become a major issue.

Conventionally, as a measure to remove snow from the roof surface of this type of building, the roof has a double membrane structure and warm air is passed between the upper and lower membranes. The purpose is only to melt snow from the surface of the membrane roof, and no attempt has been made to actively remove snow by artificial means.

Further, experiments conducted by the applicant to date have proven that simply sending warm air does not effectively dry up the snow on the surface of the membrane and remove the snow. this is,
This is because even when the snow warms and melts, the melted snow water does not overflow to the boundary between the snow and the membrane, but instead partially soaks into the snow and flows down the sloped roof.

This invention was proposed in view of the above circumstances, and provides a method for removing snow from the roof surface of a large space building with a membrane roof, which can actively and quickly remove snow from the surface of the membrane roof. The purpose is to

[Means for solving problems]

This invention relates to a method for removing snow from the roof surface of a large space building with a membrane roof. On the roof of a spatial building, at the same time as snow falls or after a certain amount of snow has accumulated on the membrane surface, hot air is blown out from the air outlet without directly hitting the membrane surface to melt the snow,
Alternatively, by melting the lower part of the snow on the roof surface into a shear bed, a water film is formed on the membrane surface,
Next, the blowing of hot air is stopped to completely freeze the water film or the shear bed-like part, and then, after a certain amount of snow has fallen on the frozen part, hot air is blown from the blower outlet to freeze the film. It is characterized in that the frozen portion is melted by heating again, and the snow on the surface of the membrane is slid and removed.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for removing snow from the roof surface of a large-space building with a membrane roof according to the present invention will be explained with reference to embodiments.

In the snow removal method according to this invention, the roof of the building is
The configuration is as shown in FIGS. 2 and 3.

FIG. 1 is a perspective view showing the entire roof of an actual building, FIG. 2 is a perspective view of an experimental apparatus showing the structure of the roof, and FIG. 3 is a sectional view thereof.

Below, to explain the details, number 1 in the figure
1 is the top chord member, and number 2 is the bundle member, each of which is a part of the structure that constitutes the roof frame.

Steel pipes are used for the upper chord members 1, 1, and air outlets 3,... are formed at regular intervals in the longitudinal direction of the upper chord members 1, 1 on the side surfaces thereof, and the air outlets 3,...
The structure is such that warm air can be blown out in a substantially parallel direction along the inner surface of the membrane 4, which will be described later.

Further, the blow-off ports 3, . . . are formed so as to face the membrane 4 in a direction parallel to the membrane 4 so that the hot air does not directly hit the membrane 4.

Number 4 is a membrane, and the entire roof surface is covered by this membrane 4.

The membrane 4 is fixed to the upper chord members 1, 1, and the center portion is pressed down from above by a pressing cable 5, whereby the membrane 4 is fixed to the left and right upper chord members 1, 1.
1 is pasted in a roughly V-shaped cross section, and as a result,
A snow sliding groove 6 is formed between the left and right upper chord members 1, 1 over the entire length of the upper chord members 1, 1 to facilitate snow sliding.

In addition, in the experimental buildings shown in Figures 2 and 3, the roof slope of the entire roof can be set at an arbitrary angle (approximately 0 to 45 degrees).
The configuration is such that it can be changed to

Next, a snow removal method according to the present invention will be explained.

The surface of the membrane 4 is wetted to form a water film on the surface of the membrane 4.

There are two ways to form a water film on the surface of the membrane 4. The first method is to heat the membrane 4 by blowing hot air from the air outlets 3, ... of the upper chord members 1, 1 at the same time as snow falls, melting the freshly accumulated snow on the surface of the membrane, and evenly spreading the entire membrane 4. Wet it.
When the entire membrane 4 is evenly wetted, stop blowing out the hot air.

The second method is to heat the membrane 4 by blowing out hot air from the blow-off ports 3, after a certain amount of snow is deposited on the surface of the membrane 4. As a result, a certain thickness at the bottom of the accumulated snow melts into a shear bed.

When the bottom part becomes like a sheer bed, blow out the hot air and stop. Note that the average speed of the warm air is preferably about 6.8 m/s.

In addition, the temperature difference between hot air and room temperature is 12 to 17
The degree is good. Furthermore, the amount of heat supplied to the vicinity of the four surfaces of the membrane is sufficient to be about 100 to 250 Kcal/m ² h.

Subsequently, the water film or shear bed-like portion is completely frozen by leaving it for a while with the heating stopped.

Subsequently, hot air is blown out from the blow-off ports 3, . . . to heat the membrane 4 again until the thin layer of the frozen portion is completely melted.

As a result, when the snow melts on the entire surface of the membrane, the snow that has accumulated on the surface of the membrane 4 begins to loosen and slide all at once to fall.

〔Effect of the invention〕

Since the present invention has the above configuration, it has the following effects.

To quickly remove snow before a large amount of snow accumulates on the roof surface. Therefore, when designing the structure, the snow load can be significantly reduced, so economical design such as making the cross section of the member as small as possible is possible.

In addition, there is no need to operate for a long time, such as half a day to a full day, and the purpose can be achieved in an extremely short period of about four hours, so running costs can be significantly reduced and the amount of heat supplied can be significantly reduced. Only a small amount is required, resulting in significant energy savings.

Since snow accumulated on the surface of the membrane can be removed in a short time, it is possible to constantly maintain the brightness unique to the membrane in the room, and at the same time prevent condensation.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is a perspective view of the entire roof, Figure 2 is a partial perspective view of the experimental building, and Figure 3 is a perspective view of a portion of the experimental building. is a partially enlarged sectional view of the roof. 1... Top chord member, 2... Bundle member, 3... Air outlet, 4...
Membrane, 5... holding cable.

Claims (1)

[Claims] 1. On the roof of a large space building with a membrane roof, which is constructed by pasting a membrane between the upper chord members with multiple hot air outlets on the side of a steel pipe roof frame, snow falls at the same time or a certain amount on the membrane surface. After snow has fallen, a water film is formed on the membrane surface by blowing warm air from the outlet so as not to directly hit the membrane surface to melt the snow, or by melting the lower part of the snow on the roof surface into a shear bed. form, followed by
The blowing of hot air is stopped to completely freeze the water film or the shear bed-like portion, and then, after a certain amount of snow has fallen on the frozen surface, hot air is sent from the blower outlet to heat the film again. A method for removing snow from a roof surface of a large space building with a membrane roof, characterized in that the frozen portion is melted and the snow on the membrane surface is slid and removed.