JP2828103B1 - Snow melting prevention and snow compaction method in snow play facilities - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To efficiently prevent snow melting by cooling snow as a whole. SOLUTION: Dry air is directly blown into the snow cover 3 of a snow play facility such as a ski resort and a snowboard park, so that the dry air penetrates into the snow cover 3, and thus the snow cover 3 is entirely cooled to reduce snow melting. To prevent and compact 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. Conventional technology 2
Buried the evaporation part of the heat pipe just under the surface of the base,
The condensing part of the heat pipe is placed on the ground, and when the outside air temperature is lower than the base temperature, the surrounding temperature is absorbed by the evaporating part and the heat generated by this is transported to the condensing part, which removes the snow on the base. It prevents melting.

[0004] Japanese Patent Application Laid-Open No. 3-166404 discloses a method in which a heat insulating sheet or material is laid on the bottom of a snow cover or a base to prevent melting of snow on the base. Hereinafter, this method is referred to as Conventional Technique 3.

In prior art 3, a water-permeable heat insulating material is laid on a base, and the upper surface of the water-permeable heat insulating material is covered with a nonwoven fabric made of synthetic fiber to prevent melting of snow on the base. 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 surface of snow is relatively small, and if the heat entering from the ground is cut off by some means, the snow to some extent Can be prevented from melting.

[0010] However, the outside air temperature of the snow play facility is zero.
When 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 the snow near the snow surface is further promoted. Therefore, it is necessary to prevent this.

[0011]

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.

[0012] Only the periphery of the cooling pipe is locally cooled, and the snow is rich in heat insulation because it has a large number of voids inside. Therefore, the cooling efficiency of the snow covered to some extent from the cooling pipe is low. That is, although snow melting around the cooling pipe can be prevented,
The effect of preventing snow melting on the surface layer of snow covered with sensible heat and 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 prevent snow melting and snow compaction in a snow play facility by efficiently cooling the entirety of the snow, thereby reliably preventing the melting of the whole snow and compacting the snow. It is to provide a hardening method.

[0015]

According to the first aspect of the present invention,
Dry air is blown directly into the snow at a snow play facility to infiltrate the dry air into the snow, thus cooling the snow entirely and preventing snow melting, and compacting the snow. It has features.

According to a second aspect of the present invention, the temperature of the dry air and the relative humidity of the dry air are represented by the following relational expressions (1) to (5): y ≦ −5x + 100 (1) −30 ≦ x ≦ 10 --- (2) 0 ≦ y ≦ 100 --- (3) In the above formula, y: relative humidity of dry air (%) x: temperature of dry air (° C.) It has features.

[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 is capable of producing dry air that satisfies the temperature and relative humidity conditions in a region surrounded by oblique lines described later. You can do it.

If dry air having a positive temperature is used, the heat insulating material 6 need not be wound around the header tube 4. That is, if dry air having a positive temperature is used, the snowmelt water does not freeze around the header tube 4, so that the construction of the header tube 4 is simplified and the equipment cost is reduced.

When the temperature and relative humidity of the dry air supplied to the header tube 4 satisfy the following relational expressions (1) to (3), 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.

Y ≦ −5x + 100 (1) −30 ≦ x ≦ 10 (2) 0 ≦ y ≦ 100 (3) In the above equation, y: relative humidity of dry air ( %) X: temperature of dry air (° C.) According to the present invention, snow melting of the 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.
Squirt inside. Since the snow cover 3 is an aggregate of fine ice particles, countless voids are formed in the snow cover 3. The dry air penetrates into the snow through this gap, and finally blows out from the surface of the snow 3 into the atmosphere.

Since the temperature of the entire snow cover 3 is approximately 0 ° C., the snow cover 3 is in a state where ice particles and snow melting water are mixed. Therefore, in the process in which the dry air permeates 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 permeates over the entire snow cover 3, whereby the entire snow cover 3 is uniformly cooled and the snow melt is reduced. It is prevented and the snow is compacted.

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

The use of the compacted snow cover 3 in an indoor artificial ski resort can withstand skiing and sliding tens of thousands of times a day and prevent the snow cover 3 from slipping due to the falling snow. , 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.

[0029]

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 (2)

(57) [Claims] 1. Dry air is directly injected into the snow at a snow play facility.
Blowing and infiltrating the dry air into the snow cover, thus cooling the snow cover as a whole to prevent snow melting and compacting the snow cover. Compaction method. 2. The temperature of the dry air and the relative humidity of the dry air are represented by the following relational expressions (1) to (3): y ≦ −5x + 100 (1) −30 ≦ x ≦ 10 (2) 0 ≦ y ≦ 100 (3) wherein, in the above formula, y: relative humidity of dry air (%) x: temperature of dry air (° C.) The method for preventing snow melting and compacting snow cover according to 1.