JP2660799B2 - 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 composed of 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 in which artificial grass is slid more easily than other artificial turf.

[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. Even if such artificial grass is used for a long period of time, the cushioning characteristics are not impaired, the rolling performance of the ball does not change over time, and the athlete does not scratch even if it falls down. Although it has the advantage, sliding can cause burns 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 turf with sand has an advantage that a burn due to a yarn at the time of slipping can be prevented, and a layer of the filler changes into a plate shape when a competitor lands so that a surface buffering effect is exhibited. However, the artificial grass with sand has a disadvantage that abrasion is easily caused by the filler exposed on the surface when the competitor slides. In addition, the filler layer may be hardened by aging, and a spike of an athlete may be captured and locked by the hardened filler layer. For this reason, a part where the player slides in is replaced with an artificial grass or an antuka or soil.

[0003] This conventional example will be described with reference to a baseball stadium shown in FIG. 3 as an example. Base bases 5 to 8 of a home base 1, a first base 2, a second base 3 and a third base 4,
The pitcher mound 10 around the pitcher plate 9 is covered with an anthuka or soil to ensure the safety of the player when the player slides in and to easily twist the foot when the pitcher throws the ball. The portions excluding the base peripheral portions 5 to 8 and the pitcher mound 10 are covered with an artificial grass 11 containing sand. Artificial lawn 11 is home base 1
As shown in FIG. 4 which exemplifies the peripheral portion 5 of the present invention, a base material 12 made of asphalt concrete or concrete having a substantially smooth upper surface is laid via a cushioning material 13 such as rubber. . The artificial turf 11 is obtained by planting a yarn made of a synthetic resin such as nylon or polypropylene on a backing fabric 14, and the turf is filled with a large number of fillers 15 of fine particles such as sand. A curb 16 is arranged at the boundary between the peripheral portion 5 and the artificial lawn 11, and the peripheral edge of the artificial lawn 11 is hung on the side of the curb 16 on the side of the home base 1, so that the antuca or soil constituting the peripheral portion 5 is formed. And hold it down.

[0004]

Thus, even if the athlete slides, it is possible to prevent a situation in which the athlete's spikes are caught in the filler layer and locked, but during the competition or during training, the untucker is used. And soil is artificial grass 11
The artificial grass was taken out to the side and not only stained the artificial grass, but also the softness of the artificial grass was impaired due to the intrusion of anthuka and soil into the grass. Therefore, it is necessary not only to frequently perform maintenance for removing the antuka and soil from the grass, but also to perform daily maintenance of the antuka and soil such as roller rolling, watering, and leveling. Furthermore, covering each of the base peripheral parts 5 to 8 and the pitcher mound 10 with an anthuka or soil means that an extremely different portion from the artificial turf 11 can be formed on the stadium, such as soccer, rugby, hockey or American football. Cannot be used as is. Therefore, prepare artificial grass for cover separately for these parts, and when playing a game other than this baseball, cover the periphery of each base and pitcher mound with artificial grass for cover and finish the entire ground to the appearance of artificial grass for the first time There is a drawback that it is not easy to switch between competition events.

Accordingly, an object of the present invention is to provide an artificial turf which is more slippery than an artificial turf in other places at least in a place where it is not preferable to lock a spike of a competitor, such as a place where sliding is performed. An object of the present invention is to provide an athletic stadium made of artificial grass which has solved the drawbacks.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an artificial turf athletic stadium in which a surface layer is constituted by an artificial turf in which synthetic resin yarn is planted on a base cloth. Consists of yarns that have a lower frictional resistance than other parts of the artificial grass.

In this case, the grass of the artificial grass of the yarn having a small frictional resistance may be filled with a filler composed of sand or a synthetic resin having a small particle size, and the filler may be made of rubber or synthetic resin. It may be composed of a granular material.

[0008]

In a portion where sliding is frequently performed, such as around a base in baseball, or in a portion where an axle is moved, such as a pitcher mound, a yarn having less frictional resistance than other portions, that is, a slippery yarn. Since the artificial lawn made of is laid, sliding can be performed easily, and the pitcher's foot can be moved smoothly. When a game other than baseball is played, the player can immediately shift to that game.

[0009] Further, by filling the grass with a filler, the sliding characteristics can be improved, and by using the filler as an elastic granular material of rubber or synthetic resin, occurrence of abrasion can be suppressed.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Components that are substantially the same as those of the above-described conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, a first embodiment shown in FIG. 1 will be described. Each base peripheral part 5 to 5 on a base 12 constituted by a water-permeable structure laid with rubble stone or crushed rock or a non-water-permeable structure such as concrete or asphalt. Except for the ground 8 and the pitcher mound 10, the entire ground can be cast with foam such as rubber chips, urethane, or polyethylene by on-site construction,
Buffer material 13 formed by laying flat molded products
Covered with. On this cushioning material 13, a man-made artificial fiber formed by implanting a large number of flat straight-haired split yarns or monofilament yarns made of a synthetic resin such as polypropylene or vinylidene chloride on the backing base cloth 14 by tufting or the like. A lawn 21 is laid. The grass of the artificial turf 21 is filled with a relatively hard filler material 15 such as sand, silica sand, or ceramic having a fine particle diameter. That is,
It is configured in the same way as a conventional sandy artificial grass stadium. Peripheral parts 5-8 and pitcher mound 10
As shown in the example of the peripheral portion 5 of the home base 1,
The artificial turf 22 on the cushioning material 13 is lined with a low sliding resistance polyolefin yarn having a lower friction resistance than the yarn of the artificial turf 21, for example, commercially available from Titisee Polyolefins BV of the Netherlands under the trade name “Thilone LSR”. A large number of plants planted on the cloth 14 are used. On the other hand, the grass of the artificial turf 22 is filled with the above-mentioned filler 15 in the lower layer, and the elastic granular material 23 made of rubber or elastic synthetic resin is filled in the upper layer. In this case, it is preferable that the elastic granular material 23 has a round granular shape.

As described above, each of the base peripheral portions 5 to 8 and the artificial turf 22 of the pitcher mound 10 are made of a material in which the yarn itself is slippery. Since the objects 23 are filled, the spikes of the competitor are not locked by the fillers 23 due to the sliding, the sliding properties are improved, and the sliding can be performed without any worry of scuffing due to burns or sand. In addition, since the base peripheral portions 5 to 8 and the pitcher mound 10 are also covered with the artificial grass 22, even when switching from a game such as baseball or softball to a game such as soccer or rugby, the processing is immediately performed without any processing. Can be played. In addition, although the filler of the artificial turf 22 has a two-layer structure of the layer of the filler 15 and the layer of the elastic granular material 23, the filler may be composed of only the filler 15 or may be composed of only the elastic granular material 23. Alternatively, a mixture of the filler 15 and the elastic granular material 23 may be filled.

In the second embodiment shown in FIG. 2, the artificial grass laid on each of the base peripheral portions 5 to 8 and the pitcher mound 10 has a height higher than that of the other portions, and the filler is slid by sliding. This is to prevent spills and make it more slippery. That is, the base 12 of the base peripheral part 5 is made lower than the base 12 of the other part, and the artificial grass 2
An artificial lawn 25 having a height higher than that of the artificial grass 1 is laid. As shown in the figure, the cushioning member 24 is provided with a large number of concave portions 26 on the lower surface opposite to the upper surface of the base 12 so as to be softer than the cushioning material 13 below the artificial grass 21. The artificial turf 25 is made of the same yarn as the artificial turf 22 and has a stuffing method,
The length of the turf is secured by crimping by an air jet method or a shaping method using a compression or heat gear.
In the artificial grass 25, a mixture of the filler 15 and the elastic granular material 23 is filled as sand.

As described above, also in the second embodiment, the portion of the artificial turf 25 is more slippery than the portion of the artificial turf 21 to improve the sliding property, and the sand is also reduced by the filler 15.
And the mixture with the elastic granular material 23, the contact is soft, and it is possible to prevent not only burns but also abrasions. Further, the cushioning material 24 has a large number of recesses 26.
Is provided to make it softer than the cushioning material 13 below the artificial grass 21, thereby increasing the safety during sliding. Furthermore, since the length of the artificial grass 25 is longer than that of the artificial grass 21, even if the competitor slides around the base peripheral portion 5, the yarn is filled with the filler 1.
5 and the elastic granular material 23 can be prevented from flowing out. Further, since the yarn is crimped, the holding property of the filler 15 and the elastic granular material 23 is also improved, and the filler 15 and the elastic granular material 2 by sliding are improved.
3. The prevention of spillage is further ensured.

The sand of the artificial turf 25 may have a two-layer structure in which the elastic granular material 23 is disposed at the upper part and the filler 15 is disposed at the lower part as in the first embodiment. Further, the shape of the cushioning material 24 is not essential, and the cushioning material 13 may be interposed under the artificial grass 25. Of course, the cushioning material 24 may be interposed below the artificial turf 22 of the first embodiment.

Next, the surface temperatures of the vinylidene chloride artificial lawn and the low-sliding resistance polyolefin yarn artificial lawn were measured using a burn evaluation tester developed at the Ono Laboratory of Tokyo Institute of Technology. Of the artificial grass was 10.2 ° C,
The artificial grass of polyolefin yarn showed a much lower temperature of 1.3 ° C. From this result, it was found that the artificial grass of polyolefin yarn was less likely to be burned even when sliding. Next, two artificial grasses of nylon yarn planted with the same pile density were prepared, sand was put in one, and sand was not used in the other, and the surface temperature was measured by the above-described burn evaluation tester. As a result, in case of sand, 1.1 ° C
On the other hand, when there was no sand, the temperature rose to 2.7 ° C. From these two experiments, it was found that by constructing the artificial turf with low sliding resistance yarn and by adding sand, the frictional heat can be kept low and the possibility of burns can be reduced.

Furthermore, the coefficient of static friction was measured when only rubber elastic particles were used as a filler in the artificial grass of nylon yarn and when only sand was used as the filler. In the test, the load was 3 kg, and nylon trunks fabric was used for the test piece. As a result, the value was 0.51 in the case of only rubber elastic particles, and 0.59 in the case of only sand, indicating that the sliding characteristics were also excellent. Also. When a person experienced soccer performed sliding and had a sensory evaluation of the sense of security against abrasions, it was evaluated that the rubber elastic particles alone were safe, but the sand alone was uneasy.

From the results of these experiments, it can be seen that the place where the sliding is performed is made of an artificial grass which is more slippery than other parts, so that the sliding can be performed safely. It was found that the occurrence of abrasions can be suppressed by replacing the body.

In each of the embodiments described above, the artificial lawn containing sand is described as an example. However, in the case of the artificial lawn without sand, the artificial lawn where the sliding is performed is constituted by a yarn which is more slippery than the artificial lawn in other parts. By doing so, a similar effect can be obtained. Further, as another means of making it slippery, by making the tuft density of the artificial grass in that part smaller than that of the artificial grass in other parts, the movement can be facilitated and the frictional resistance can be reduced.

[0020]

As described above, the artificial turf athletic stadium according to the present invention can be used for a part where sliding is frequently performed, for example, around a base in baseball, or where an axle moves like a pitcher mound. Since the part to be formed is made of a yarn having a smaller frictional resistance than the artificial turf of the other part, the sliding can be easily performed and the pitcher of the pitcher can be moved smoothly. Furthermore, as compared with the conventional case where these portions are made into antuka or soil, it is possible to switch to a game such as soccer or rugby without any change.

Further, as described in the second aspect, the sliding characteristics are improved by filling the grass of artificial grass with a small frictional resistance with sand or synthetic resin having a small particle diameter. Further, when the filler is made of an elastic granular material of rubber or synthetic resin as described in claim 3, generation of scratches due to sliding can be suppressed.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a main part of a second embodiment of the artificial turf athletic stadium according to the present invention.

FIG. 3 is a schematic plan view for explaining an example of a conventional baseball shape.

FIG. 4 is a longitudinal sectional view showing the vicinity of the base.

[Explanation of symbols]

 5-8 Base peripheral portion 10 Pitcher mound 12 Base 13,24 Buffer material 14 Base cloth 15 Filler 21,22,25 Artificial turf 23 Elastic granular material

Claims (3)

(57) [Claims] 1. In an artificial turf athletic stadium in which the surface layer is constituted by artificial turf in which synthetic resin yarn is planted on a base cloth, at least a portion where sliding is performed frequently has an artificial portion of another portion. An artificial turf athletic stadium characterized by an artificial turf made of yarn with a smaller frictional resistance than the lawn. 2. The method according to claim 1, wherein the lawn of the artificial lawn of the yarn having a small frictional resistance is filled with a filler made of sand or a synthetic resin having a small particle diameter. Athletic stadium made of artificial grass. 3. The artificial turf athletic stadium according to claim 2, wherein the filler is made of an elastic granular material of rubber or synthetic resin.