JPH04111802A - Preventing structure for snow thawing in skiing ground - Google Patents

Abstract

PURPOSE:To prevent the thawing of snow by a method in which the contact points of small expanded wires are melted for bonding and the small wire assembly so formed is placed on the ground. CONSTITUTION:A thermoplastic resin is heated and mixed with an blowing agent and extruded through a mouth piece to form many expanded small wires. In this case, the contact portions of the adjacent small wires are bonded by melting to form a small wire assembly 12 having formless spaces 13 between the adjacent small wires. The assembly 12 is placed over-all slope of skiing ground 10, a nonwoven fabric 17 is placed on the assembly 12 by fixing parts, and a synthetic resin mat 16 is placed on the fabric 17. The thawing of snow by the heat of the ground can thus be effectively prevented and the conduction of the heat by water can be prevented because the thawed water permeates quickly into the ground through the spaces 13 of the assembly 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a snow melting prevention structure for reducing snow melting due to geothermal heat at a ski resort.

[Prior art and problems to be solved by the invention] In addition to natural ski resorts that utilize natural snowfall, there are so-called artificial ski resorts that use artificial snow machines to spread artificial snow onto the slopes. At all ski resorts, accumulated snow tends to melt due to the geothermal heat of the slopes. The extent of snow melting caused by geothermal heat is estimated to be more than twice that of snow melting caused by solar heat or outside temperature. Especially in early winter and early spring, even in regions with high geothermal heat or low geothermal heat,
This geothermal heat melts a large amount of snow. This makes it difficult to secure snow cover suitable for skiing, and at artificial ski resorts, frequent scattering of replenishing artificial snow is required. This causes problems such as increased maintenance costs. Furthermore, if we try to avoid this, we will be forced to shorten the operating period of ski resorts.

Therefore, there is a need to cut off geothermal heat and reduce the amount of snow melt. For this reason, it is conceivable to lay, for example, tatami mats or mushiguchi as a heat insulating material between the ground and the snow. However, in this case, so-called snowmelt water produced by melting snow is absorbed into the tatami mats and mushiguchi. Since water easily conducts heat, this water reduces the insulation effect of tatami mats and mushiguchi, transmits geothermal heat upwards, and the snow melts due to this heat. Furthermore, if the sand and soil contained in the melting snow water clog the tatami mats and mud openings, drainage becomes poor and the insulation effect is further reduced.

Furthermore, these tatami mats and mushiguchi corrode due to long-term use and have poor durability, making them unsatisfactory.

[Means for Solving the Problems] In the present invention, the following measures were taken in order to solve the various problems mentioned above. That is, the present invention is an assembly of a large number of foam strips made of a thermoplastic resin,
The contact portions of each foam strip are fused to each other, a strip assembly having voids is laid on the ground, and a nonwoven fabric is further laid on top of this strip assembly. shall be.

[Function] Thermoplastic resin foam is known as an excellent heat insulating material. This invention uses such a heat insulating material, and by laying it on the ground, it blocks geothermal heat from being conducted to the snow.

This makes it possible to maintain snow cover suitable for skiing. Furthermore, since this heat insulating material is made up of an aggregate of strips and has voids between adjacent strips, the heat insulating effect is particularly remarkable.

Furthermore, snowmelt water passes through the voids in this foam,
It quickly penetrates into the ground and is eliminated.

Furthermore, snowmelt water is not absorbed into the foam. This prevents snow from melting without reducing the insulation effect.

Furthermore, since the heat insulating material is made of synthetic resin, it has excellent corrosion resistance. Therefore, it can be used semi-permanently.

Furthermore, since the nonwoven fabric acts as a filter, it is possible to prevent clogging caused by sand and soil contained in snowmelt water. Thereby, the drainage performance of the strip assembly can be maintained, and a decrease in the heat insulation effect can be prevented.

[Example] An embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, reference numeral 10 indicates the ground of a ski slope at a ski resort. 12 is a block-shaped strip aggregate, which is laid on the ground 10.

14 is a nonwoven fabric.

The strip aggregates 12 are laid in all directions according to the undulations of the ground 10 on a ski slope.

Furthermore, a nonwoven fabric 14 is laid on this aggregate 12 using a fixture (not shown). The strip aggregate 12 and the nonwoven fabric 14 constitute the snow melting prevention structure of the present invention. Further, 16 is a mat made of synthetic resin laid on the non-woven fabric 14, which further improves skiing performance.

The strip aggregate 12 is obtained as follows.

That is, a thermoplastic resin is heated to a molten state, and a blowing agent is mixed therein. The resin is then extruded through a multi-pore die and formed into multiple foam strips. At this time, some or all of these strips are bent in a wave-like manner.

Each foam strip is focused while it is still in a molten state. As a result, adjacent strips are fused to each other at the contact portions and are integrated as a collection of strips. After the assembly has cooled, it is cut approximately every 30 centimeters.

The strip aggregate 12 thus obtained has a thickness of 5 to 15 cm, a length of 30 cm, and a width of 20 to 30 cm.
It has a centimeter block shape. A perspective view of this strip assembly 12 is shown in FIG.

Further, the strip assembly 12 has irregularly shaped voids 13 between adjacent strips. It is preferable that the void portion 13 is formed in an amount of 10% or more by volume of the entire strip assembly 12. When the void portion 13 is less than 10% by volume, the insulation effect,
Physical properties such as compression resistance, bending resistance, and impact resistance deteriorate. Moreover, it becomes difficult to quickly remove snowmelt water.

The thermoplastic resin used for manufacturing the strip assembly 12 of the present invention includes most of the thermoplastic resins such as polyvinyl chloride, polyvinyl acetate, polystyrene, polyethylene, polypropylene, polyamide, and the like. Among these, polystyrene is preferred because it has stable physical properties such as water resistance, impact resistance, and heat insulation.

Although detailed drawings of the mat 16 are omitted, the mat 16 is composed of a plurality of mat structures made of synthetic resin. Each component has a substantially square ring shape when viewed from above. On this upper surface, a large number of rod-shaped protrusions with a length of 2 to 3 centimeters are stacked upwardly. The structure also has a connecting portion at each corner.

The structural members are successively connected through this connecting portion, and the mat is formed into a predetermined size. Even at ski resorts, especially at uninhabited ski resorts and natural ski resorts with a small amount of snow, installing this mat 16 will improve skiing performance.

The strip aggregate 12 blocks geothermal heat from being conducted to the snow 18 and prevents the snow 18 from melting.

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

In addition, if the snowmelt water contains soil or sand, the nonwoven fabric 14 is laid on the strip aggregate 12, so the snowmelt water directly enters the strip aggregate 12, creating voids. 13 clogging does not occur. In addition, the nonwoven fabric 14
And by laying the mat 16 on the strip aggregate 12, this aggregate 12 is stabilized. Therefore, the strip assembly 12 does not easily move due to external impact.

As described above, the strip assembly 12 is made of strips in which some or all of the strips are bent in a wavy manner. Layer many layers so that the stripes of the two adjacent layers intersect,
The contact portions of these strips may be fused together.

Further, the thickness, size, etc. of the aggregate 12 can be arbitrarily changed depending on the conditions of each ski resort, such as the degree of geothermal heat, the undulation of the slope, etc.

Further, the snow melting prevention structure of the present invention may be installed over the entire slope of a ski resort, or may be installed only in areas where a relatively large amount of snow melts.

Further, the mat 16 does not necessarily need to be laid. Snow may be piled up directly on the nonwoven fabric 14.

All other embodiments that fall within the scope of the claims are within the scope of this invention.

[Effects of the Invention] The present invention uses a strip aggregate made of synthetic resin foam, which has excellent heat insulation properties, and by laying it on the ground, it can prevent snow from being generated by geothermal heat. Melting can be effectively prevented. In addition, since snowmelt water quickly permeates into the ground through the voids in the strip aggregate, conduction of geothermal heat by water can be prevented, and the insulation effect is even better.

Furthermore, as mentioned above, since the heat insulating material of the present invention is made of synthetic resin, it has excellent corrosion resistance and can be used semi-permanently.

Furthermore, the nonwoven fabric acts as a filter. By laying this nonwoven fabric on the strip aggregate, it is possible to prevent clogging that occurs in the strip aggregate.Thereby, the drainage performance of the strip aggregate can be maintained.
The insulation effect is further improved.

Therefore, even if the ski resort is located in a season with low snowfall, in a region with low snowfall, or in a region with high geothermal heat, snow cover suitable for skiing can always be ensured. This eliminates the need for frequent spraying of replenishing artificial snow, reducing maintenance costs. Additionally, the operating period of the ski resort can be extended.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
The sectional view, FIG. 3, is a perspective view of the strip assembly. 10... Ground, 12... Strip aggregate, 13...
void, 14... nonwoven fabric, 16... mat, 18.
··snow.

Claims (1)

[Claims] 1. An assembly of a large number of foam strips made of thermoplastic resin, in which the contact parts of each foam strip are fused to each other, and the strip assembly with voids is placed on the ground. A structure for preventing snow melting at a ski resort, characterized in that a non-woven fabric is further laid on top of the thin strip aggregate.