JPH0819643B2 - Snow melting prevention structure at ski resort - Google Patents

Description

TECHNICAL FIELD The present invention relates to a snow melting prevention structure for reducing melting of snow due to geothermal heat at a ski resort.

[Problems to be Solved by Conventional Techniques and Inventions] Ski resorts include not only natural ski resorts that use natural snowfall, but also so-called artificial ski resorts in which artificial snow is sprayed on a slope by an artificial snowfall machine. At any of the ski resorts, the accumulated snow easily melts due to the geothermal heat of the ground on the slopes. The extent of snow melting due to geothermal heat is large, and it is estimated that it will be more than twice as much as that due to solar heat and outside temperature. In particular, even in regions with high geothermal power and regions with low geothermal power, the amount of snowmelt due to this geothermal heat is large during early winter and early spring. As a result, it is difficult to secure snowfall suitable for skiing, and it is necessary to frequently spray supplemental artificial snow at artificial ski resorts. This causes a problem that the burden of maintenance costs increases. If they try to avoid this, they will be forced to shorten the skiing season.

Therefore, it becomes necessary to cut off the geothermal heat and reduce the amount of snowmelt. Therefore, as a heat insulating material between the ground and snow,
For example, laying tatami mats and muscillo can be considered. However, in this case, so-called snow-melting water generated by melting snow is absorbed by the tatami mat and the muscillo. Since water easily transfers heat, this water reduces the heat insulation effect of tatami mats and muscillo, transfers the geothermal heat upward, and the snow melts due to this heat. Further, if the tatami mat and the muscillo are clogged by the sand or soil contained in the snowmelt water, the drainage performance is deteriorated and the heat insulation effect is further reduced.

Moreover, these tatami mats and muscillo rolls are corroded by many years of use, have poor durability, and are not satisfactory.

[Means for Solving the Problem] In the present invention, the following means were taken in order to solve the various problems described above. That is, the present invention is an assembly of a large number of foam strips made of a thermoplastic resin, wherein the contact portions of each foam strip are fused to each other, and a strip assembly having a void portion, It is characterized in that it is laid on the ground, and a non-woven fabric is laid on this strip assembly.

[Work] Thermoplastic foam is known as an excellent heat insulating material. This invention uses such a heat insulating material,
By laying this on the ground, it blocks the transfer of geothermal heat to the snow. This makes it possible to maintain snowfall suitable for skiing. Moreover, since this heat insulating material is made of a strip aggregate and has voids between adjacent strips, the heat insulating effect is particularly remarkable.

Furthermore, the snowmelt water quickly penetrates into the ground through the voids in this foam and is eliminated. Further, the snow melting water is not absorbed by the foam. As a result, the heat insulating effect does not decrease and snow melting can be prevented.

Further, since the heat insulating material is made of synthetic resin, it has excellent corrosion resistance. Therefore, it can be used semipermanently.

Furthermore, since the non-woven fabric serves as a filter,
It is possible to prevent clogging due to sand or soil contained in the snowmelt water. Thereby, the drainage property of the strip aggregate can be maintained, and the reduction of the heat insulating effect can be prevented.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 10 is the ground of the slope on a ski resort. Reference numeral 12 is a block-shaped strip assembly, which is laid on the ground 10. 14 is a non-woven fabric.

On the slope of a ski resort, the strip assembly 12 is laid on all sides according to the undulations of the ground 10. Further, a non-woven fabric 14 is laid on the aggregate 12 using a fixture (not shown). The strip aggregate 12 and the non-woven fabric 14 constitute the snow melting prevention structure of the present invention. Further, 16 is the non-woven fabric 14
It is a synthetic resin mat laid on top of the ski, which further improves ski gliding performance.

The strip aggregate 12 is obtained as follows. That is, the thermoplastic resin is heated to a molten state, and the foaming agent is mixed therein. Then, the resin is extruded from a die having a large number of pores to form a large number of foam strips. At this time, some or all of these strips are bent in a wavy shape. Each strip is focused while the foam strip is still in a molten state. As a result, the adjacent strips are fused together at the contact portion, and are integrated as an aggregate of strips. After the assembly cools, it is cut approximately every 30 centimeters. The strip assembly 12 thus obtained has a thickness of 5 to 15 cm, a length of 30 cm, and a width of 20 cm.
It has a block shape of ~ 30 cm. A perspective view of the strip assembly 12 is shown in FIG.

Further, the strip assembly 12 has an irregular void portion 13 between adjacent strips. The void portion 13 is a strip assembly.
It is preferable to form 10% by volume or more of the whole 12. When the void portion 13 is less than 10% by volume, physical properties such as heat insulating effect, compression resistance, bending resistance and impact resistance are deteriorated. In addition, it becomes difficult to quickly remove the snowmelt water.

As the thermoplastic resin used for producing the strip assembly 12 of the present invention, almost all thermoplastic resins such as polyvinyl chloride, polyvinyl acetate, polystyrene, polyethylene, polypropylene and polyamide can be mentioned. Of these, polystyrene is preferable because it has stable physical properties such as water resistance, impact resistance, and heat insulation.

Although a detailed drawing of the mat 16 is omitted, this mat
16 is composed of a plurality of synthetic resin mat components. Each component has a substantially square ring shape when viewed from the top. On this upper surface, a large number of rod-shaped protrusions having a length of 2 to 3 cm extend upward.
In addition, this structure has a connecting portion at each corner. The mats are formed into a predetermined size by sequentially connecting the constituents from the connecting portion. In ski areas, especially artificial ski areas and natural ski areas with low snowfall, this mat 16
If you lay it, the gliding performance will improve.

The strip assembly 12 blocks the transfer of geothermal heat to the snow 18 and prevents the snow 18 from melting.

Further, the snowmelt water passes through the inside of the nonwoven fabric 14. Then, the snowmelt water has voids 13 formed by the strip aggregate 12.
And quickly penetrates into the ground 10. Therefore, there is no concern that the heat insulation effect will be reduced by the snowmelt water.

Further, when the snowmelt water contains soil or sand, the nonwoven fabric 14 is laid on the strip aggregate 12, so that the snowmelt water enters the strip aggregate 12 as it is to form a void. 13 clogging does not occur. Further, by laying the non-woven fabric 14 and the mat 16 on the strip assembly 12, the assembly 12 is stabilized. Therefore, the strip assembly 12 does not easily move due to an external impact.

As described above, the strip assembly 12 is one in which a part or all of the strips is bent in a wave shape, but a layer formed by arranging linear strips side by side in the width direction is used. A large number of overlapping strips may be formed so that adjacent two upper and lower strips may intersect with each other, and the contact portions of these strips may be fused to each other.

Further, the thickness, size, etc. of the aggregate 12 can be arbitrarily changed depending on the conditions of each ski resort, for example, the degree of geothermal heat, the undulating state of the slope, and the like.

Further, the snow melting prevention structure of the present invention may be laid on the entire surface of the slope of a ski resort, or may be laid only on a portion where the amount of snow melting is relatively large.

Further, the mat 16 does not necessarily have to be laid. Snow may be directly deposited on the non-woven fabric 14.

In addition, all the embodiments belonging to the claims are within the scope of the present invention.

[Advantages of the Invention] The present invention uses a strip assembly made of a synthetic resin foam and has excellent heat insulation properties. By laying the strip assembly on the ground, it is possible to remove snow caused by geothermal heat. Melting can be effectively prevented. In addition, since the snowmelt water quickly penetrates into the ground through the voids of the strip aggregate, it is possible to prevent the conduction of geothermal heat by water and to further improve the heat insulating effect.

Further, as described above, since the heat insulating material of the present invention is made of synthetic resin, it has excellent corrosion resistance and can be used semipermanently.

Further, the non-woven fabric acts as a filter. By laying this non-woven fabric on the strip aggregate, it is possible to prevent clogging of the aggregate. This makes it possible to maintain the drainage of the strip assembly,
The heat insulation effect is further improved.

Therefore, even in a ski resort in a region with a small amount of snowfall, a region with a small amount of snowfall, a region with high geothermal heat, etc., it is possible to always secure snowfall suitable for skiing.
This eliminates the need for frequent spraying of artificial snow for replenishment and reduces maintenance costs. Also, the business period of the ski resort can be extended.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a perspective view of a strip assembly. 10 …… Soil, 12 …… Strip aggregate, 13 …… Void area, 14 ……
Non-woven fabric, 16 …… mat, 18 …… snow.

 ─────────────────────────────────────────────────── --- Continuation of front page (72) Inventor Kiyoji Shinohara 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Inventor Motoaki Miyazaki 4-chome, Meguro-hon, Meguro-ku, Tokyo No. 7 (72) Inventor Hiroyasu Ogata 2-6-1, Namiki, Kanazawa-ku, Yokohama-shi Kanagawa 402 (72) Inventor Yoshikatsu Tani 2-16-8 Yuyamadai, Kawanishi-shi, Hyogo

Claims (1)

[Claims] 1. A ground aggregate comprising a large number of foam strips made of a thermoplastic resin, wherein the contact portions of the foam strips are fused to each other and have voids. A structure for preventing snow melting at a ski resort, which is constructed by laying a non-woven fabric on top of the strip aggregate and laying a non-woven fabric on the strip aggregate.