CA1313093C - Method for removing snow from dome surface of large spatial building with film dome - Google Patents
Method for removing snow from dome surface of large spatial building with film domeInfo
- Publication number
- CA1313093C CA1313093C CA000592463A CA592463A CA1313093C CA 1313093 C CA1313093 C CA 1313093C CA 000592463 A CA000592463 A CA 000592463A CA 592463 A CA592463 A CA 592463A CA 1313093 C CA1313093 C CA 1313093C
- Authority
- CA
- Canada
- Prior art keywords
- film
- snow
- hot air
- dome
- melting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Tents Or Canopies (AREA)
Abstract
ABSTRACT
The present invention relates to a snow-removing method for the use of a large spatial building with a film dome, which is built for the purpose of application to facilities for sports in an area with high snowfall, and aims to alleviate a snow load and save energy at the time of melting of snow by speedily removing the snow which lies on the surface of the film dome before the film dome is covered with a large quantity of snow.
The present invention relates to a snow-removing method for the use of a large spatial building with a film dome, which is built for the purpose of application to facilities for sports in an area with high snowfall, and aims to alleviate a snow load and save energy at the time of melting of snow by speedily removing the snow which lies on the surface of the film dome before the film dome is covered with a large quantity of snow.
Description
13~3~93 METHOD FOR REMOVING SNOW FROM DOME SURFACE OF LARGE
SPATIAL BUILDING WITH FILM DOME
Thls inventlon relates to a snow-removing method for the use of a large spatial building with a film dome, which is built for the purpose of application to facilities for sports in an area of high snowfall, and aims to alleviate a snow load and save energy at the time of melting of snow by speedily removing the snow which lies on the surface of a film dome before the film dome is covered with a large quantity of snow.
BACKGROUND OF THE INVENTION
Recen-tly, there are many cases where a large spatial building with a film dome is built for the use of facilities for sports and meeting places even in an area of high snowfall.
When that kind of large spatial building with a film dome is built in the area of high snowfall, a measure to removal of the snow which lies on the film dome is an important problem.
Conventionally, as for that kind of measures to removal of the snow, use has been generally made of a method comprislng the step of melting the snow which lies on a film dome having a double structure consisting of upper and lower films by making the film dome warm with hot air passed through be-tween the upper and lower ~J' 30~3 films of -the film dome to thereby remove th,e snow.
That kind of method is merely used for melting the snow which lies on the film dome and any snow-removing work is not performed with artlficial means.
Further, the fac-t that it ls not possible to slide down the snow lying on the film dome well by merely making the film dome warm with hot air is established by various experiments conducted up to now by the present applicant.
The above fact is recognized for the reason that, even i.f the snow lying on the dome surface melts, water resulting from melting of the snow is partly absorbed in the snow without overflowing into a portion between the snow and the film dome and simultaneously flows down along the dome surface.
SUMMARY OF THE INVENTION
The present invention relates to a snow-removing method for the use of a large spatial building with a film dome constructed by providing a film stretched between upper chord members of a roof of truss, which comprises the steps of forming a water film on the surface of a film by melting all of the snow lying on the film surface by making the film warm with hot air blown off through a plurality of hot air supply openings provided in the upper chord members made of steel pipes or melting only the snow lying on the bo-ttom into the ~;
. ~ ' ; ' .
~3~ 93 form of sherbet simultaneously with a perlod of time when snow begins to fall or after a fixed quantity of snow has lain on the film surface, then temporarily stopping the blowoff of hot air to completely freeze over the water film or sherbet-like snow portion, subsequently mel-ting the frozen portion by making the film warm again with the hot air blown off through the hot air supply openings after a Eixed quantity of snow has lain on the frozen portion, and -thereby sliding down the snow lying on the film surface therealong to remove the snow from the film surface.
According to this snow-removing method, it is possible to perEorm a snow-removing work before a large quantity of snow lies on the dome surface, so that the film dome may be maintained to be always in a state free from snow.
- Accordingly, in its struc-tural design, a snow load may be remarkably reduced and economical design may be attained such as to lessen the section of a member as small as possible, for example.
Further, it is not necessary to perform the running of an air-conditioning over a long period of time as much as from a half day to all day long.
Therefore, since the purpose for conditioning of air may be sufficiently achieved with its running in an extremely short period of time down to as low as four hours, the running cost may be remarkably reduced and .
~3~3~93 the quan-tity of heat may be lessened to thereby improve the energy saving.
Furthermore, the snow lying on the film surface in a short period of time may be removed and -the film surface may be main-tained to be always in a state free from snow to thereby enable the na-tural lightening at all times and serve as a prevention against dew condensation.
OBJECT OF T~IE INVENTION
It is an object of the present invention to provide a snow-removing method for the use of a large spatial building with a film dome which permits alleviation of a snow load and saving of energy at the time of melting of snow by positively and speedily removing the snow which lies on the film dome before the film dome is covered with a large quanti-ty of snow.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view showing the entire constitution of a film dome of a large spatial building with a film dome;
Fig. 2 is a fragmentary perspective view showing the structure of a film dome serving as an experiment apparatus; and Fig. 3 is a fragmentary enlarged-scale perspective vlew showing the dome.
' . . .
' 9-3~3~33 DETAILED DESCRI'PTION OF THE PREFERRED EMBODIMENT OF THE
INVENTION
Hereinafter will be explained a snow-removing method for the use of a large spatial building with a film dome according to the present invention with reference to the illustrated embodiment.
According to the snow-removing method in the present invention, a film dome is so structured as shown in Figs. 1 through 3.
Fig. 1 is a view showing the entire constitution of an actual film dome of the large spatial building with a film domei Fig. 2 is a perspective view showing the structure of a dome serving as an experiment apparatus; and Fig. 3 is a sectional view showing the same.
The structure of the film dome will now be explained in detall. In Figures, reference numeral 1 designates an upper chord membér, 2 a compound member, and both of these members constitute a part of a structural body constituting the frame of a film dome.
Use is made of steel pipes as the upper chord members 1, 1. A plurality of hot air supply openings 3, ... are formed in each side surface of the upper chord members 1, 1 at regular intervals in the longitudinal direction of the upper chord members 1, 1.
Further, it is so structured that hot air is passed through the upper chord members 1, 1 to blow off ~3~3~3 inside a film 4 which will be later described, through the supply openings 3, ... The supply openings 3, ...
are directed to be substantlally in parallel to the film 4 so as to prevent the ho-t air from directly blowing against the film 4.
Reference numeral 4 designates a film, with which the entire dome surface is covered.
The film 4 is fixed to the upper chord members 1, 1 and a center of the film is pressed downward by means of a pressure cable 5.
Accordingly, the film 4 is stre-tched between left and right upper chord members 1, 1 in the form of V in section to provide a subs-tantially V-shaped groove 6 in section adapted to slide the snow down and formed between the left and right upper chord members 1, 1 as extending over the entire length thereof.
As a result, the snow which lies on the surface of the film dome comes to easily slide through the groove 6 down to the ground.
Further, it is so structured that the dome inclination of the entire film dome may be freely varied at a desired angle (about O to 45).
In subsequence, the~snow-removing method of the present invention will be explained.
(1) First, a water film is formed on the surface of the film 4 by getting the film surface wet. There are two ways of forming the water film on the surface of the . ~
.
.' ~3~3C~93 film 4. As for a first way, there is provided a method, in which the snow immediately after having lain on the surface of the film 4 is melted by making the film 4 warm with hot air blown off through a plurality of hot air supply openings 3, ... simultaneously wi-th a period of time when the snow beings to fall to thereby uniformly get the surface of the film 4 wet, and then the blowoff of hot air is stopped when the surface of the film 4 sufficiently comes to be we-t.
As a second way, there is provided a method, in which the snow lying on the bo-ttom is melted into the form of sherbet by making the film 4 warm with hot air blown off through the hot air supply openings 3, ...
after a fixed quanti-ty of snow has lain on the surface of the film 4, and then the blowoff of hot air is stopped when the surface of the film 4 sufficiently comes to be wet. Further, about 6.8m/s will suffice for the average flow speed of hot air in this case.
Further, a tempera-ture difference be-tween the temperature at the blowoff time of hot air and room temperature is preferably set to be within the range of 12 to 17C. Further, the range of about 100 to 250 kal/m h will suffice for the quantity of heat -to be fed in the neighborhood of the film 4.
SPATIAL BUILDING WITH FILM DOME
Thls inventlon relates to a snow-removing method for the use of a large spatial building with a film dome, which is built for the purpose of application to facilities for sports in an area of high snowfall, and aims to alleviate a snow load and save energy at the time of melting of snow by speedily removing the snow which lies on the surface of a film dome before the film dome is covered with a large quantity of snow.
BACKGROUND OF THE INVENTION
Recen-tly, there are many cases where a large spatial building with a film dome is built for the use of facilities for sports and meeting places even in an area of high snowfall.
When that kind of large spatial building with a film dome is built in the area of high snowfall, a measure to removal of the snow which lies on the film dome is an important problem.
Conventionally, as for that kind of measures to removal of the snow, use has been generally made of a method comprislng the step of melting the snow which lies on a film dome having a double structure consisting of upper and lower films by making the film dome warm with hot air passed through be-tween the upper and lower ~J' 30~3 films of -the film dome to thereby remove th,e snow.
That kind of method is merely used for melting the snow which lies on the film dome and any snow-removing work is not performed with artlficial means.
Further, the fac-t that it ls not possible to slide down the snow lying on the film dome well by merely making the film dome warm with hot air is established by various experiments conducted up to now by the present applicant.
The above fact is recognized for the reason that, even i.f the snow lying on the dome surface melts, water resulting from melting of the snow is partly absorbed in the snow without overflowing into a portion between the snow and the film dome and simultaneously flows down along the dome surface.
SUMMARY OF THE INVENTION
The present invention relates to a snow-removing method for the use of a large spatial building with a film dome constructed by providing a film stretched between upper chord members of a roof of truss, which comprises the steps of forming a water film on the surface of a film by melting all of the snow lying on the film surface by making the film warm with hot air blown off through a plurality of hot air supply openings provided in the upper chord members made of steel pipes or melting only the snow lying on the bo-ttom into the ~;
. ~ ' ; ' .
~3~ 93 form of sherbet simultaneously with a perlod of time when snow begins to fall or after a fixed quantity of snow has lain on the film surface, then temporarily stopping the blowoff of hot air to completely freeze over the water film or sherbet-like snow portion, subsequently mel-ting the frozen portion by making the film warm again with the hot air blown off through the hot air supply openings after a Eixed quantity of snow has lain on the frozen portion, and -thereby sliding down the snow lying on the film surface therealong to remove the snow from the film surface.
According to this snow-removing method, it is possible to perEorm a snow-removing work before a large quantity of snow lies on the dome surface, so that the film dome may be maintained to be always in a state free from snow.
- Accordingly, in its struc-tural design, a snow load may be remarkably reduced and economical design may be attained such as to lessen the section of a member as small as possible, for example.
Further, it is not necessary to perform the running of an air-conditioning over a long period of time as much as from a half day to all day long.
Therefore, since the purpose for conditioning of air may be sufficiently achieved with its running in an extremely short period of time down to as low as four hours, the running cost may be remarkably reduced and .
~3~3~93 the quan-tity of heat may be lessened to thereby improve the energy saving.
Furthermore, the snow lying on the film surface in a short period of time may be removed and -the film surface may be main-tained to be always in a state free from snow to thereby enable the na-tural lightening at all times and serve as a prevention against dew condensation.
OBJECT OF T~IE INVENTION
It is an object of the present invention to provide a snow-removing method for the use of a large spatial building with a film dome which permits alleviation of a snow load and saving of energy at the time of melting of snow by positively and speedily removing the snow which lies on the film dome before the film dome is covered with a large quanti-ty of snow.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view showing the entire constitution of a film dome of a large spatial building with a film dome;
Fig. 2 is a fragmentary perspective view showing the structure of a film dome serving as an experiment apparatus; and Fig. 3 is a fragmentary enlarged-scale perspective vlew showing the dome.
' . . .
' 9-3~3~33 DETAILED DESCRI'PTION OF THE PREFERRED EMBODIMENT OF THE
INVENTION
Hereinafter will be explained a snow-removing method for the use of a large spatial building with a film dome according to the present invention with reference to the illustrated embodiment.
According to the snow-removing method in the present invention, a film dome is so structured as shown in Figs. 1 through 3.
Fig. 1 is a view showing the entire constitution of an actual film dome of the large spatial building with a film domei Fig. 2 is a perspective view showing the structure of a dome serving as an experiment apparatus; and Fig. 3 is a sectional view showing the same.
The structure of the film dome will now be explained in detall. In Figures, reference numeral 1 designates an upper chord membér, 2 a compound member, and both of these members constitute a part of a structural body constituting the frame of a film dome.
Use is made of steel pipes as the upper chord members 1, 1. A plurality of hot air supply openings 3, ... are formed in each side surface of the upper chord members 1, 1 at regular intervals in the longitudinal direction of the upper chord members 1, 1.
Further, it is so structured that hot air is passed through the upper chord members 1, 1 to blow off ~3~3~3 inside a film 4 which will be later described, through the supply openings 3, ... The supply openings 3, ...
are directed to be substantlally in parallel to the film 4 so as to prevent the ho-t air from directly blowing against the film 4.
Reference numeral 4 designates a film, with which the entire dome surface is covered.
The film 4 is fixed to the upper chord members 1, 1 and a center of the film is pressed downward by means of a pressure cable 5.
Accordingly, the film 4 is stre-tched between left and right upper chord members 1, 1 in the form of V in section to provide a subs-tantially V-shaped groove 6 in section adapted to slide the snow down and formed between the left and right upper chord members 1, 1 as extending over the entire length thereof.
As a result, the snow which lies on the surface of the film dome comes to easily slide through the groove 6 down to the ground.
Further, it is so structured that the dome inclination of the entire film dome may be freely varied at a desired angle (about O to 45).
In subsequence, the~snow-removing method of the present invention will be explained.
(1) First, a water film is formed on the surface of the film 4 by getting the film surface wet. There are two ways of forming the water film on the surface of the . ~
.
.' ~3~3C~93 film 4. As for a first way, there is provided a method, in which the snow immediately after having lain on the surface of the film 4 is melted by making the film 4 warm with hot air blown off through a plurality of hot air supply openings 3, ... simultaneously wi-th a period of time when the snow beings to fall to thereby uniformly get the surface of the film 4 wet, and then the blowoff of hot air is stopped when the surface of the film 4 sufficiently comes to be we-t.
As a second way, there is provided a method, in which the snow lying on the bo-ttom is melted into the form of sherbet by making the film 4 warm with hot air blown off through the hot air supply openings 3, ...
after a fixed quanti-ty of snow has lain on the surface of the film 4, and then the blowoff of hot air is stopped when the surface of the film 4 sufficiently comes to be wet. Further, about 6.8m/s will suffice for the average flow speed of hot air in this case.
Further, a tempera-ture difference be-tween the temperature at the blowoff time of hot air and room temperature is preferably set to be within the range of 12 to 17C. Further, the range of about 100 to 250 kal/m h will suffice for the quantity of heat -to be fed in the neighborhood of the film 4.
(2) Subsequently, the surface of the film 4 is left alone for a while under the condition that the blowoff of hot air is stopped to then completely freeze over the . .
~3~3~
water film of the film 4 and sherbet-like snow portion.
~3~3~
water film of the film 4 and sherbet-like snow portion.
(3) Then, the frozen portion on the surface of the film 4 is melted by making -the film 4 warm agai.n with the hot air blown off through -the hot air supply openings 3, ...
When the frozen portion on the surface of the film 4 begins to melt down, the snow lying on the film 4 gradually melts and starts sliding at once to thereby fall down -to the ground through the groove 6.
When the frozen portion on the surface of the film 4 begins to melt down, the snow lying on the film 4 gradually melts and starts sliding at once to thereby fall down -to the ground through the groove 6.
Claims (2)
1) A snow-removing method for the use of a large spatial building with a film dome constructed by providing a film between upper chord members of a roof of truss, comprising the steps of:
forming a water film on the surface of the film by melting snow which lies on the surface of the film by making said film warm with hot air blown off through a plurality of hot air supply openings provided in the upper chord members formed of steel pipes simultaneously with a period of time when the snow begins to fall;
then temporarily stopping the blowoff of said hot air to completely freeze over said water film;
subsequently melting said frozen portion by making said film warm again with the ho-t air blown off through said plurality of hot air supply openings after a fixed quantity of snow has lain on said frozen portion; and then sliding the snow lying on the film surface down to remove said snow from the surface of said film.
forming a water film on the surface of the film by melting snow which lies on the surface of the film by making said film warm with hot air blown off through a plurality of hot air supply openings provided in the upper chord members formed of steel pipes simultaneously with a period of time when the snow begins to fall;
then temporarily stopping the blowoff of said hot air to completely freeze over said water film;
subsequently melting said frozen portion by making said film warm again with the ho-t air blown off through said plurality of hot air supply openings after a fixed quantity of snow has lain on said frozen portion; and then sliding the snow lying on the film surface down to remove said snow from the surface of said film.
2) A snow-removing method for the use of a large spatial building constructed by providing a film stretched between upper chord members of a roof of truss, comprising the steps of:
forming a water film by melting only the snow lying on its bottom on the surface of the film into the form of sherbet by making said film warm with hot air blown off through a plurality of hot air supply openings provided in the upper chord members formed of steel pipes after a fixed quantity of snow has lain on the film surface;
then temporarily stopping the blowoff of hot air to completely freeze over said sherbet-like snow portion;
melting said frozen portion by making said film warm again with the hot air blown off through said hot air supply openings after a fixed quantity of snow has lain on said frozen portion; and then sliding said snow lying on the film surface down to remove said snow from the surface of said film.
forming a water film by melting only the snow lying on its bottom on the surface of the film into the form of sherbet by making said film warm with hot air blown off through a plurality of hot air supply openings provided in the upper chord members formed of steel pipes after a fixed quantity of snow has lain on the film surface;
then temporarily stopping the blowoff of hot air to completely freeze over said sherbet-like snow portion;
melting said frozen portion by making said film warm again with the hot air blown off through said hot air supply openings after a fixed quantity of snow has lain on said frozen portion; and then sliding said snow lying on the film surface down to remove said snow from the surface of said film.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-48858 | 1988-03-02 | ||
| JP4885888A JPH01223267A (en) | 1988-03-02 | 1988-03-02 | Snow removal on roof surface of large-space building with membrane roof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1313093C true CA1313093C (en) | 1993-01-26 |
Family
ID=12814971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000592463A Expired - Fee Related CA1313093C (en) | 1988-03-02 | 1989-03-01 | Method for removing snow from dome surface of large spatial building with film dome |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH01223267A (en) |
| CA (1) | CA1313093C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04347282A (en) * | 1991-05-23 | 1992-12-02 | Ohbayashi Corp | Removal of snow by sliding |
| JPH0518144A (en) * | 1991-07-05 | 1993-01-26 | Ohbayashi Corp | Method and device for slidingly removing snow |
| JP2684883B2 (en) * | 1991-07-19 | 1997-12-03 | 株式会社大林組 | How to remove roof snow |
-
1988
- 1988-03-02 JP JP4885888A patent/JPH01223267A/en active Granted
-
1989
- 1989-03-01 CA CA000592463A patent/CA1313093C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01223267A (en) | 1989-09-06 |
| JPH0443546B2 (en) | 1992-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |