JP3253204B2 - Athletic stadium made of artificial grass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf athletic stadium in which a surface material is constituted by artificial turf in which a yarn made of a synthetic resin such as nylon or polypropylene is implanted in a base cloth. The present invention relates to an athletic stadium made of artificial turf filled with fillers in grass so as to stabilize the lawn and to allow players to play the game safely without abrasion even when sliding or the like.

[0002]

2. Description of the Related Art In various sports stadiums, artificial turf in which a yarn made of a synthetic resin such as nylon or polypropylene is planted on a base fabric as a surface material thereof is widely used. Such artificial turf has the advantage that, even when used for a long period of time, the buffer characteristics are not impaired, the rolling performance of the ball does not change over time, and there is no abrasion even if the player falls down. is there. However, when sliding, burns may occur due to friction with the surface yarn.

Therefore, in recent artificial lawns, so-called sand-containing artificial lawns in which a large number of fillers such as sand having a fine particle diameter are filled in the grass are widely constructed. This artificial grass with sand can prevent burns caused by yarn when sliding,
When an athlete lands, the filler layer changes to a plate-like shape to provide a two-dimensional cushioning effect, and the weight of the filler allows for laying on the base and lowering construction costs. There are advantages such as possible. However, in the artificial grass with sand, there is a disadvantage that the abrasion is easily caused when the player slides due to the filler exposed on the surface.

[0004]

Therefore, it has been considered that the filler is made of an elastic material such as a rubber vulcanizate or urethane and is filled with the filler to prevent abrasion. However,
When only such an elastic filler was filled, it was found that the artificial grass was unsuitable because the entire grass was too soft, the landing interval was not stable, and the ball did not bounce properly in a ball game.

In this case, if the length of the artificial grass is shortened and filled with an elastic filler, the above-mentioned disadvantages can be solved to some extent due to the hardness of the base layer of the artificial grass. It is light and cannot stabilize the artificial lawn, and repeated sliding etc. will cause the artificial lawn to shift, and in order to prevent it, it will be necessary to adhere the artificial lawn base cloth to the base layer However, the advantage that the construction cost is reduced by the laying construction is lost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an artificial turf athletic stadium which can be laid and constructed without impairing playability of various sports and preventing abrasion due to sliding.

[0007]

SUMMARY OF THE INVENTION The present invention provides an athletic game made of artificial grass in which a synthetic resin yarn is planted on a base cloth, and a surface layer is formed of artificial grass in which the filler is filled in the grass. In the field, the filler comprises a lower layer of a hard filler made of hard granules, and an upper layer of an elastic, granular, elastic filler disposed on the lower layer; The thickness of the layer is at least three times the average particle size of the elastic filler, and the true specific gravity of the elastic filler is 0.9 to
1.5 and smaller than the hard filler.

[0008]

Since the lower layer of the filler filling the grass of the artificial grass is made of a hard filler, the artificial grass can have an appropriate weight. Therefore, even if an extreme impact is applied, it is possible to stabilize without causing displacement, and laying work is also possible, so that the construction cost can be reduced.

Further , since the upper layer is made of an elastic filler, even if the player slides , the upper layer comes into contact with the elastic filler having elasticity, so that scratches due to sliding or the like can be prevented. Further, by making the thickness of the upper layer three times or more the average particle size of the elastic filler, it is possible to prevent the hard filler of the lower layer from being exposed during play and to fill the elastic filler. Work is easy.

In addition, the true specific gravity of the elastic filler is 0.9-1.
5 and smaller than the hard filler in the lower layer, so that the filler is filled into the hard filler when draining due to rainfall or water sprinkling, etc. when filling the grass into the grass or constructing artificial grass outdoors. The elastic filler can be prevented from being mixed, and the elastic filler can be stably positioned at the upper part and the hard filler at the lower part without the elastic filler being mixed in the hard filler.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, the first embodiment shown in FIG. 1 will be described. An artificial lawn 1 is made of a foam having rubber chips, urethane, polyethylene or the like on a base 2 made of concrete or asphalt or a water-permeable structure laid with chestnut or crushed stone. The body is laid and laid through a cushioning material 3 which is constructed by casting a body in the field or laying a flat molded product.

The artificial turf 1 is made of a flat yarn-like split yarn or a monofilament yarn 4 made of a synthetic resin such as polypropylene or vinylidene chloride.
Are planted in the backing fabric 5 by tufting or the like. In the grass of the artificial turf 1, a lower layer 7 formed by filling a hard filler 6 such as sand, quartz sand, ceramic, glass beads, or mineral granules having a small particle size, and a lower layer 7 An upper layer 9 made of a granular elastic filler 8 made of an elastic synthetic resin such as a rubber vulcanizate or a urethane resin to be filled thereon is provided.

As described above, since the lower layer 7 of the hard filler 6 which is relatively heavy and is stable after filling, and the upper layer 9 of the soft elastic filler 8 which hits the lower layer 7 are provided, Can prevent abrasion of the player. Further, not only the elastic force and the safety of the cushioning material 3 provided at the lower part of the artificial grass 1 but also the elastic force and the safety can be contributed by the elastic filler 8 forming a layer.

Furthermore, the artificial grass 1 can be positioned so as to be pressed against the base 2 by the relatively heavy lower layer 7, so that the artificial grass 1 is not displaced by an extreme movement such as sliding, and laying work is also possible. The construction cost can be reduced.

In the above embodiment, the upper layer 9 and the lower layer 7
The hard filler 6 of the lower layer 7 is applied to the upper layer 9 and the elastic filler of the upper layer 9 is applied to the lower layer 7 by spraying the elastic filler 8 and spreading it thereafter. In some cases, the material 8 may be mixed slightly, and even if mixed slightly, the effect is not significantly changed, and it is not necessary to clearly separate the upper layer 9 and the lower layer 7.

Next, the specific gravities of the hard filler 6 and the elastic filler 8 were changed, and the thickness of the upper layer 9 was changed, and the stability of these fillers due to mobility and movement by rainwater or wind was examined. That is, the following four specific examples were made and the flowability of the filler in the upper layer due to rainwater and the mobility due to the wind, and the state of the upper and lower layers after exercise were examined. Table 1 shows the results.

Specific Example 1: The elastic filler of the upper layer is composed of a urethane low foam having a true specific gravity of 0.9 to 1.0 and an average particle size of 1.4 mm, and the hard filler of the lower layer is a true specific gravity. Was composed of 2.3 natural silica sand.

Specific Example 2: The elastic filler of the upper layer is composed of rubber chips having a true specific gravity of 1.2 and an average particle size of 1.4 mm,
The hard filler in the lower layer was the same as in Example 1.

Specific Example 3: The elastic filler of the upper layer is composed of a rubber chip having a true specific gravity of 1.5 and an average particle size of 1.4 mm,
The hard filler in the lower layer was the same as in Example 1.

Specific Example 4: The elastic filler of the upper layer is used in specific example 3.
The hard filler of the lower layer was made of an epoxy resin powder having a true specific gravity of 1.3.

Each of the examples had a size of 2 × 2 m, and they were constructed on a roof. In each specific example, two types of dispersion thickness of the elastic filler of the upper layer of 3 mm and 5 mm were prepared.

[0022]

[Table 1] In addition, the study of the mobility by rainwater and wind was visually confirmed after leaving for 3 months. The water gradient is 1/1
00. In addition, the stability of the filler due to the movement can be checked by following the same exercise on the artificial grass of each specific example, and visually observing the subsequent state. The lawn was constructed and the change over time due to walking was observed, and judgment was made based on the state of both.

According to Table 1, if the true specific gravity of the hard filler is greater than the true specific gravity of the elastic filler, the upper and lower layers will not be mixed, and if the true specific gravity is 0.9 or more, the elastic filler is stable. It turns out. Also, it was found that the lower layer was not exposed if the thickness of the scattered elastic filler was at least three times the average particle size.

[0024]

As described above, according to the artificial turf athletic stadium of the present invention, the filler put in the grass is composed of the lower layer of the hard filler made of hard granular material and the lower layer of the hard filler. Since the lower layer is composed of a rubber vulcanizate and an upper layer of granular elastic filler made of elastic synthetic resin, the lower part of the artificial turf becomes heavier than the upper part and stably The surface can be brought into surface contact with the base, and even if an extreme impact is applied, no displacement occurs, the laying work can be performed, and the construction cost can be reduced.

The thickness of the upper layer is at least three times the average particle size of the elastic filler constituting the upper layer,
Even if the player slides, the hard filler in the lower layer is not exposed and comes into contact with the elastic filler having elasticity, so that abrasion during sliding can be prevented.

Further, the true specific gravity of the elastic filler is 0.9 to 1.
5 and smaller than the hard filler,
Even when artificial grass is constructed outdoors, the elastic filler is prevented from flowing into the hard filler due to drainage due to rainfall or water sprinkling, etc. The filler and the hard filler at the bottom can be stably positioned.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of an artificial turf athletic stadium according to the present invention.

[Description of Signs] 1 artificial grass 2 base 3 buffer material 4 yarn 5 backing base cloth 6 hard filler 7 lower layer 8 elastic filler 9 upper layer

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-47405 (JP, A) JP-B-63-39725 (JP, B2) Jiko 5-17098 (JP, Y2)

Claims (1)

(57) [Claims] Claims: 1. A synthetic resin yarn is planted on a base cloth,
In an artificial turf athletic stadium in which the surface layer is composed of artificial turf filled with a filler in the grass, the filler is a lower layer of a hard filler made of hard granular material, and And an upper layer made of a granular elastic filler having elasticity disposed in the upper layer.
When the thickness is at least three times the average particle size of the elastic filler,
The true specific gravity of the elastic filler is 0.9 to 1.5,
An artificial turf athletic stadium characterized by being smaller than the hard filler .