JP2848392B1 - Snowmelt prevention and snow cover compaction method for snow-playing facility - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To surely prevent snow melting by efficiently cooling the entire snow cover and to compact the snow cover. SOLUTION: On a snow-covered base 1 in a snow play facility,
A header tube 6 having a plurality of dry air blowing holes 5 is laid over the entire base 1, and 0 ≦ y ≦ − by a dry air supply source including a compressor for air compression and a dehumidifier.
Dry air satisfying 5x + 100, 0 <x ≦ 10 (where x: temperature of dry air ° C., y: relative humidity% of dry air) is produced, and the dry air thus produced is supplied to a header tube. 6 to allow the dry air to penetrate into the snow through the dry air blowing holes 5, whereby the dry air is blown into the atmosphere from the surface of the snow 3 and flows in a layered manner along the surface of the snow. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing snow melting and compacting snow in a facility such as a skiing area and a snowboarding area (hereinafter referred to as a snow play facility). The present invention relates to a method for preventing snow melting and compacting snow in a snow play facility, which can prevent snow melting and compact snow.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing snow melting in a snow play facility, there is a method disclosed in Japanese Patent Application Laid-Open No. 1-293887. Hereinafter, this snow melting prevention method is described in Prior Art 1
That.

In the prior art 1, a refrigerant is circulated in a cooling pipe buried in a base to prevent melting of snow on the base. Another method using a refrigerant pipe is disclosed in Japanese Patent Application Laid-Open No. 3-28405. Hereinafter, this method is referred to as Conventional Technique 2.

In prior art 2, an evaporating portion of a heat pipe is buried immediately below the surface of a base, and a condensing portion of the heat pipe is arranged on the ground portion. And transports the resulting heat to the condensing section to prevent the snow on the base from melting.

[0005] Japanese Patent Application Laid-Open No. 3-166404 discloses a technique in which a heat insulating sheet or material is laid on a snow bottom or a base to prevent the snow on the base from melting. Hereinafter, this method is referred to as Conventional Technique 3.

In prior art 3, a permeable heat insulating material is laid on a base, and the upper surface of the permeable heat insulating material is covered with a nonwoven fabric made of synthetic fiber to prevent the snow on the base from melting. Another method is disclosed in Japanese Patent Application Laid-Open No. 3-180604. Hereinafter, this method is referred to as Conventional Technology 4.

In the prior art 4, a snow support sheet formed by forming a heat insulating layer made of a foamed resin on the back surface of a planar fiber base material is laid on a base to prevent melting of snow on the base. .

As another method, Japanese Patent Application Laid-Open No. 2-240304
Is disclosed in Japanese Unexamined Patent Publication No. Hereinafter, this method is referred to as Conventional Technique 5. In prior art 5, a grid-like frame is formed on a base, and a heat insulating member is accommodated in the frame to prevent melting of snow on the base.

Further, as another method, Japanese Patent Application Laid-Open No. 3-939
There is one disclosed in Japanese Patent Publication No. 05-2005. Hereinafter, this method is referred to as Conventional Technique 6. In prior art 6, a heat insulating layer is formed on a base via a waterproof coating, a holding plate is laid on the heat insulating layer via a waterproof coating, and a drain groove is formed on the holding plate to form a snow cover on the base. It prevents melting.

In a snow play facility, when the outside air temperature is 0 ° C. or less, the heat entering from the snow surface is relatively small. Can be prevented from melting.

[0011] However, the outside air temperature of the snow play facility is zero.
If the temperature rises above + ° C. and the radiant heat is large, the amount of heat entering from the snow surface increases, and the melting of snow near the snow surface is promoted. Therefore, it is necessary to prevent this.

[0012]

However, in order to prevent the melting of snow in a snow play facility where the room temperature or the outside air temperature exceeds 0 ° C., when the above-mentioned prior arts 1 and 2 are applied, the following problems are caused. Problem.

[0013] Only the periphery of the cooling pipe is locally cooled, and the snow cover has a large number of voids inside, so that the snow is rich in heat insulation. Therefore, the cooling efficiency for snow covered to some extent from the cooling pipe is low. That is, although snow melting around the cooling pipe can be prevented,
In particular, the effect of preventing snow melting on the surface layer of snow covered with sensible heat or radiant heat is low.

On the other hand, when the above-mentioned prior arts 3, 4, 5, and 6 are applied, there are the following problems. In the case of laying a heat insulating sheet or a heat insulating material in a snow bottom or a base, it is possible to block infiltration heat from the ground to some extent, but it is not possible to block heat infiltration from the snow surface.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to efficiently prevent the melting of the entire snow cover by efficiently cooling the entire snow cover and to compact the snow cover. It is to provide a hardening method.

[0016]

According to the first aspect of the present invention,
A header pipe having a plurality of dry air blowing holes is laid over the entire base on a snow base in a snow play facility, and a dry air supply source including a compressor for air compression and a dehumidifier is used as follows. 1) and (2), 0 ≦ y ≦ −5x + 100 (1) 0 <x ≦ 10 (2) In the above (1) and (2), x: temperature of dry air ( C) y: dry air satisfying the relative humidity (%) of the dry air is produced, and the dry air thus produced is supplied to the header tube, and the dry air is supplied from the dry air blowing hole. Blowing in the snow,
It is characterized in that it permeates snow and that the dry air is ejected from the surface of the snow into the atmosphere.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for preventing snow melting and a method for compacting snow in a snow play facility according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view when the present invention is applied to an indoor artificial ski resort, and FIG. 2 is a graph showing the relationship between the temperature of dry air used in the present invention and the relative humidity of dry air. .

In FIG. 1, reference numeral 1 denotes a snow base of an indoor artificial ski resort. On the upper surface of the base 1, a drain groove 2 for draining the molten water to the outside is formed. Reference numeral 3 denotes snow on the base 1. Reference numeral 4 denotes a header pipe laid on the base 1. The header tube 4 has a plurality of dry air outlets 5 formed at an upper portion thereof at intervals. The header tube 4 is laid in a meandering or lattice-like shape over the entire base 1. The periphery of the header tube 4 is covered with a heat insulating material 6. Dry air is supplied to the header tube 4 from a dry air supply source (not shown). The dry air supply source includes a compressor for air compression and a dehumidifier for removing moisture contained in the compressed air, and can produce dry air that satisfies the temperature and relative humidity conditions in a region surrounded by oblique lines described later. Things.

When the temperature and relative humidity of the dry air supplied to the header tube 4 satisfy the following relational expressions (1) and (2), snow melting can be effectively prevented. That is, if the temperature and the relative humidity of the dry air are maintained in the region surrounded by the oblique lines in FIG. 2, snow melting can be effectively prevented.

0 ≦ y ≦ −5x + 100 (1) 0 <x ≦ 10 (2) In the above (1) and (2), x: temperature of dry air (° C.) y: dry Relative humidity of air (%) According to the present invention configured as described above, melting of snow at an indoor artificial ski resort is prevented as follows, and
The snow cover is compacted.

Dry air that satisfies the temperature and relative humidity conditions in the area enclosed by the diagonal lines is supplied from the air supply source to the header tube 4, and the dry air is supplied from each blow hole 5 to the snow cover 3.
Blow in. Since the snow cover 3 is an aggregate of fine ice particles, countless voids are formed in the snow cover 3.
The dry air flows through the voids throughout the snow and finally blows out from the surface of the snow 3 into the atmosphere.

Since the temperature of the entire snow cover 3 is substantially 0 ° C., the snow cover 3 is in a state in which ice particles and snow melting water are mixed. Therefore, in the process in which the dry air flows through the snow cover 3 and blows out to the atmosphere, the relative humidity of the dry air changes to almost 100%. That is, the snowmelt water present in the snow cover 3 evaporates and is taken into the dry air. At this time, the heat of evaporation is removed from the snow cover 3 to give the snow cover 3 cold heat. Since the cold snow is frozen, the snow is prevented from melting, and the hardness and the shear strength of the snow cover 3 are increased. Thus, snow melting is prevented and the snow cover is compacted.

Since the dry air blowing holes 5 are provided over the entire base 1, the dry air flows over the entire snow cover 3, thereby uniformly cooling the entire snow cover 3 and preventing snow melting. In addition, the snow cover is compacted.

Since the temperature of the air blown into the atmosphere from the surface of the snow 3 is 0 ° C., the density is higher than that of the air. Therefore, the air that has blown into the atmosphere flows in a layered manner along the surface of the snow cover 3, whereby sensible heat transfer from the atmosphere is interrupted, and the occurrence of the condensation phenomenon is prevented.
Snow melting is prevented, and snow cover is compacted.

If the compacted snow cover 3 is used in an indoor artificial ski resort, it can withstand tens of thousands of skiing or snowboarding runs a day, and can prevent slippage due to the snow shedding phenomenon in which the snow cover 3 falls off. , The state of the good snow cover 3 can always be maintained. Further, since the snow cover 3 is compacted, an avalanche phenomenon does not occur even when the inclination angle of the base 1 is large.

Although the present invention has been described above by applying the present invention to an indoor artificial ski resort, it is needless to say that the present invention can also be applied to snow play facilities such as an outdoor ski resort and a snowboarding place.

[0028]

As described above, the present invention has the following useful effects. By infiltrating dry air directly into the snow,
Compared with the prior arts 1 and 2 in which the refrigerant pipe is laid on the base and the prior arts 3, 4, 5 and 6 in which the heat insulating sheets and materials are laid on the base, the entire snow cover can be efficiently cooled. Therefore, melting of the entire snow cover can be reliably prevented, and the snow cover can be compacted. In snow play facilities such as skiing areas and snowboarding areas, compacting the snow cover can withstand tens of thousands of skis and snowboards a day, and prevent slippage due to falling snow, which is always good. Since the state of snow cover can be maintained and the snow cover is compacted, an avalanche phenomenon does not occur even when the inclination angle of the base is large.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view when the present invention is applied to an indoor artificial snow play facility.

FIG. 2 is a graph showing the relationship between the temperature of dry air used in the present invention and the relative humidity of dry air.

[Explanation of symbols]

 1: Base 2: Groove 3: Snow cover 4: Header tube 5: Dry air outlet 6: Insulation material

Claims (1)

(57) [Claims] 1. A dry air supply including a compressor for air compression and a dehumidifier, wherein a header pipe having a plurality of dry air outlets is laid over the base of the snow in a snow play facility. Depending on the source, the following formulas (1) and (2): 0 ≦ y ≦ −5x + 100 (1) 0 <x ≦ 10 (2) In the above (1) and (2), x: Dry air temperature (° C.) y: Dry air that satisfies the relative humidity (%) of dry air is produced, and the dry air thus produced is supplied to the header tube, and the dry air is subjected to the dry air. Blow into the snow through the dry air outlet,
A method for preventing snow melting and compacting snow in a snow play facility, characterized by infiltrating into snow cover, and blowing the dry air from the snow cover surface into the atmosphere to flow in layers along the snow cover surface.