JPH06193010A - Athletic field provided with artificial lawn - Google Patents

Abstract

PURPOSE:To enable the rolling property of a ball to be simply surely adjusted in an athletic field provided with artificial lawn. CONSTITUTION:Granules 6 having 1-5mm of grain diameter are uniformly scattered on the upper surface of artificial lawn 2 projecting from a filler 5 layer. The grain diameter of the granule 6 is set in consideration of the diameter, weight or shape of a ball used, so that the rolling property of the ball equivalent to that in an athletic field provided with soil or natural lawn can be given. Also, if the concentration of the granules becomes uneven in use, the initial condition can be recovered easily by brushing. The granules may be recovered in the athletic field in which various sports are played if the granules obstruct the sports.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an athletic stadium in which a large number of fillers having a fine particle size are filled in the grass, and more particularly, it is used in a game in which a ball such as a gate ball, putter golf or hockey is rolled on the ground. The present invention relates to an artificial turf sports stadium in which the rolling characteristics of the ball can be controlled according to the type of ball.

[0002]

2. Description of the Related Art In stadiums for ball sports such as baseball, soccer, hockey, gateball or putter golf, the stadium is easy to maintain, easy to use after rain, and uniform in ground condition. Due to such characteristics, artificial turf is widely used. As artificial turf, artificial turf (hereinafter referred to as sandless artificial lawn) in which a pile of synthetic resin such as nylon or polypropylene is densely planted on the base fabric as the surface layer material, or the pile interval is slightly widened. Artificial turf having a filling material such as sand in its grass (hereinafter referred to as sand-containing artificial turf) is roughly classified into two types.

A sandless artificial lawn has a base cloth with a length of 6 to 14
Compared to conventional natural turf, it has densely planted mm piles, does not impair the cushioning characteristics even after long-term use, and does not cause the rolling performance of the ball to change over time. Although it has the advantage that it will not be scratched even if it falls, it is slippery and may cause burns due to friction with the surface pile when sliding. Also,
In the case of a ball game using metal spiked shoes, there is a drawback in that the use of metal spiked shoes has to be restricted because the artificial lawn is damaged. Furthermore, since only the pile and the base cloth are provided, the cushioning property at the time of landing of the athlete is hard, and the player feels tired when playing for a long time. In order to improve this, it is also proposed to arrange a cushioning layer composed of rubber chips or urethane resin chips on the bottom surface of the base cloth, but this is a local deformation that only the landing point of the athlete is deformed, and the feeling of fatigue. The current situation is that it has not been completely improved.

On the other hand, the artificial lawn containing sand is filled with a filling material such as sand or silica sand having a fine particle diameter so that the layer thickness is 13 to 30 mm.
-5 mm is projected. Therefore, moisture such as rain or water sprinkling is sucked into the packed bed, and the water drainage of the pile is significantly better than that of the sandless artificial lawn, and the weight of the pile is small. In addition, the artificial grass without sand has a light weight, so it is fixed to the base by adhesion, etc.
Since it is 0 to 30 kg / square m, it can be laid on a base and can be constructed at an advantage that the construction cost can be reduced. Furthermore, since the filler layer is also exposed to some extent, it is possible to prevent burns due to piles when sliding, and when the athlete lands, the filler layer changes to a plate shape and has a surface cushioning effect, so there is no sand. It has better cushioning properties than artificial grass. For these reasons, the athletic field of artificial grass with sand is becoming widespread.

On the other hand, in ball games such as gateball, hockey, and putter golf, in the case of a sandless artificial lawn, a straight-haired pile is more resistant to rolling of the ball, and compared to a stadium of natural soil or natural grass. It is difficult for the ball to roll, and in the case of artificial grass with sand, the pile weight is less than that of artificial grass without sand, so the rolling of the ball is not hindered by the pile, but the particle size of the filler that is sand is Since it is as small as 1 mm or less, there is a drawback that the ball rolls too much. So in the case of sandless artificial grass,
By planting straight-haired piles at predetermined intervals and planting the piles in the gap by a method called high cut low loop, which is a loop-shaped pile, and in the case of a sand-containing artificial lawn, By rolling crimped piles, the balls adjust their rolling resistance.

[0006]

However, the processing such as changing the planting method or processing the pile has a drawback that the production cost is high. Furthermore, during use in competition, the artificial turf may become sagging, and the rolling characteristics of the ball may change over time and roll too much from the beginning, or the rolling characteristics may differ between those areas that are often used and those that are not. Sometimes.

[0007] In the stadium made of artificial turf other than the artificial turf treated to improve the rolling characteristics of the ball as described above, practice in preparation for competitions and competitions in stadiums such as natural turf and soil. However, it was impossible to change the rolling characteristics of the ball.

[0008] Therefore, an object of the present invention is to provide an artificial turf sports stadium in which the rolling characteristics of the ball can be adjusted simply and reliably without changing the planting method or processing piles. Is to provide.

[0009]

SUMMARY OF THE INVENTION The present invention is composed of sand or synthetic resin having a small grain size on the grass of artificial grass constructed by implanting a pile made of synthetic resin on a base cloth. In an athletic field made of artificial grass filled with a filling material, the particle size is 1 to 5 mm on the upper surface of the artificial grass protruding from the layer of the filling material.
It is characterized in that the granular material of (1) is uniformly dispersed.

The above-mentioned particulate matter may be fixed to the tip of the pile.

[0011]

[Function] By considering the diameter, weight or shape of the ball to be used and setting the particle size of the granular material to any value within the range of 1 to 5 mm, it has ball rolling characteristics equivalent to those of the stadium of soil or natural grass. Can be made. Also, since the granular material is only scattered, if the density of the granular material becomes uneven during use, you can easily restore it to the initial state by brushing, and a stadium where you can play various sports. In this case, if the particulate matter interferes with the competition, it can be collected.

In the case of a stadium such as a gate ball, hockey or putter golf, the above-mentioned granular material is fixed to the tip of each pile by means such as adhesion or welding.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention shown in the drawings will be described below. A base 1 having a substantially smooth upper surface.
The artificial grass 2 is laid on the top. The base 1 may have a water-permeable structure such as cobblestone or crushed stone, or a non-water-permeable structure such as concrete or asphalt. Artificial grass 2 is
Pile 3 composed of flat straight-hair split yarn or monofilament yarn made of synthetic resin such as polyamide, acrylic, vinylidene chloride or polypropylene is lined with backing base cloth 4 at the same spacing as conventional sand-containing artificial grass. It is constructed by arranging a large number of plants.
In the grass of the artificial grass 2, a filler 5 composed of sand, silica sand, elastic granular material of a polymer material or a mixture thereof having a fine particle diameter of 0.1 to 1.0 mm is used as each sand pile. Three
Is filled with a thickness sufficient to expose the tip of the to about 1 to 2 mm. Although not shown in the figure, a rubber chip, a foamed material such as urethane or polyethylene is placed between the base 1 and the backing base cloth 4 at the construction site, or a flat molded product is laid. A cushioning material may be interposed. Granules 6 having a particle size of 1 to 5 mm are scattered on the filler 5 so as to fill the exposed pile tips. The granular material 6 is composed of silica sand, sand, beads, glass beads, rubber chips, or the like.

The particle size of the particles 6 has different effects depending on the diameter, weight or shape of the ball of the ball game to be played, or the surface condition such as the height or unevenness of the exposed pile 3 of the artificial grass 2. Therefore, it may be adjusted in consideration of these. When the particle size of the granular material 6 is 1 mm or less, the rolling of the ball is hardly affected, and when the particle size is 5 mm or more, the rolling distance of the ball is too small or irregular rolling occurs. Therefore, it is desirable to select the particle size depending on the diameter and weight of the ball used or the surface condition of the artificial grass 2. If the density of the granular material 6 becomes non-uniform during use, it can be easily returned to the initial state by brushing. Further, in a stadium where various kinds of competitions are held, if the particulate matter 6 interferes with the competition, it can be collected by a cleaning machine or the like. In the case of a stadium such as a gate ball, hockey, or putter golf, these particles 6 may be fixed to each pile 3 by means such as adhesion or welding.

Next, taking the gate ball as an example, the results of experiments on the rolling characteristics of the ball according to the present invention will be described. The experiment measured the rolling distance of the ball on each ground of soil, natural grass and artificial grass. The gateball stick rotatably supports the tip of its shaft on a support so that it hits the gateball on the ground when the head comes directly under, and this head is angled at 45 °, that is, 21 cm from the artificial grass. From the height of the ball, the ball was rotated by its own weight and applied to the ball, and the rolling distance of the ball was measured. The artificial turf gland is made of artificial turf having a pile length of 19 mm and a filling material having a particle size of 0.1 to 2.0 mm.
No. 3 silica sand with an average particle size of 1.2 mm was uniformly sprayed at a rate of 0.3 kg / sq. Silica sand uniformly dispersed at a rate of 0.1 kg / square meter, which is ⅓ of that in Concrete Example 1 (Concrete Example 2);
3 times as much as 0.9 kg / square meter (specific example 3), 0.8 mm silica having an average particle size smaller than that of specific example 1 was applied at the same ratio as specific example 1. (Specific example 4), the average particle size is 1.7 m larger than that of specific example 1.
Six types were prepared, one in which m of silica sand was sprayed at the same ratio as in Specific Example 1 (Specific Example 5), and only the above-mentioned artificial sand containing sand (Specific Example 6). In addition to this, the rolling distance of the ball was measured on a soil ground and a natural grass ground.
As a result, the rolling distances of the balls in the soil ground and the natural grass were 3.8 m, respectively, whereas the rolling distances of the balls in Concrete Examples 1, 2, 3, 4, 5, and 6 were 4. 0m, 4.5m, 5.5m, 5.1
m, 3.0 m (irregular frequent occurrence) and 6.0 m. As a result, it can be seen that the rolling distance of the ball in Example 1 is about the same as that of the soil ground or the natural grass ground.

Next, using No. 3 silica sand having a particle diameter of 1.41 mm occupying 86% and No. 4 silica sand having a particle diameter of 0.84 mm occupying 62%, balls having different spraying amounts The rolling suppression effect was measured. The results are shown in Table 1 below.
Shown in.

[0017]

[Table 1] As can be seen from this table, in the case of No. 3 silica sand, the amount of spray was 0.
It can be seen that the inhibitory effect is large in any case of 1, 0.3, and 0.5 Kg / square m, and particularly when 0.3 Kg / square m is sprayed, the inhibitory effect is extremely exerted. On the other hand, in the case of No. 4 silica sand, it was found that the suppression effect could not be controlled by increasing / decreasing the amount of spraying because the particle size was small.

[0018]

INDUSTRIAL APPLICABILITY As described above, the present invention has a very simple structure in which the granular material having a particle size of 1 to 5 mm is uniformly dispersed on the upper surface of the artificial grass protruding from the layer of the filler, but it is used. By setting the particle size of the granules in consideration of the diameter, weight, and shape of the ball, it is possible to provide the ball rolling characteristics equivalent to those of the stadium of soil or natural grass. Also, since the granular material is only scattered, if the density of the granular material becomes uneven during use, you can easily restore it to the initial state by brushing, and a stadium where you can play various sports. In this case, if the particulate matter interferes with the competition, it can be collected.

Further, in the case of a stadium such as a gate ball, hockey or putter golf, the granular material may be fixed to the tip of each pile by means such as adhesion or welding as described in claim 2. Good.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view showing a part of an embodiment of the present invention.

[Explanation of symbols]

 1 Base 2 Artificial grass 3 Pile 4 Backing base cloth 5 Filling material 6 Granular material

Claims (2)

[Claims] 1. An artificial turf in which sand having a small particle size or a filler made of a synthetic resin is filled in the turf of an artificial turf which is formed by implanting a pile made of a synthetic resin on a base cloth. In the sports stadium, the grain size on the upper surface of the artificial grass is 1 ~
An athletic stadium made of artificial turf, characterized by the uniform distribution of 5 mm particles. 2. The athletic stadium made of artificial turf according to claim 1, wherein the granular material is fixed to the tip of the pile.