JPH0768001A - Athletic field sodded with artificial lawn - Google Patents

Abstract

PURPOSE:To sod slippery artificial lawn on a place where at least sliding is carried out and it is not preferable to lock spikes of a contestant so that the whole athletic field can be sodded with the artificial lawn. CONSTITUTION:In an athletic field sodded with artificial lawn, a section 5 thereof where at least sliding is very frequently carried out is sodded with artificial lawn 22 of yarn having frictional resistance smaller than that of artificial lawn 21 in the other sections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial lawn athletic stadium in which a surface layer material is composed of an artificial lawn in which a synthetic resin yarn such as nylon or polypropylene is planted in a base cloth. It relates to an artificial lawn athletic field where artificial grass is made to be slippery than other artificial grass in areas where activities are frequently performed.

[0002]

2. Description of the Related Art Artificial lawns in which a synthetic resin yarn such as nylon or polypropylene is planted as a base fabric are widely used as a surface material for various sports fields. Even if such an artificial lawn is used for a long period of time, it does not impair the cushioning characteristics, the rolling performance of the ball does not change with time, the athlete does not get scratched even if it falls, etc. Although there is an advantage, when sliding, it may 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 used. This sand-containing artificial lawn has advantages that it can prevent burns caused by the yarn when sliding, and that the layer of the filler changes to a plate-like shape when the athlete lands and has a surface cushioning effect. However, the artificial grass with sand has a drawback that the filler exposed on the surface when the athlete slides easily causes scratches. Also, the layer of filler may harden over time, and this hardened layer of filler may trap and lock the athlete's spikes. Therefore, an artificial grass is used instead of an artificial lawn for the part where the player slides in.

This conventional example will be explained by taking the baseball field shown in FIG. 3 as an example. Peripheral portions 5 to 8 of the home base 1, the first base 2, the second base 3 and the third base 4,
Then, the pitcher mound 10 around the pitcher plate 9 is covered with antoka or soil to ensure safety when the player slides in and to easily twist the foot when the pitcher pitches. The peripheral parts 5 to 8 and the parts except the pitcher mound 10 are covered with a sand-containing artificial grass 11. Artificial grass 11 is home base 1
As shown in FIG. 4 which illustrates the peripheral portion 5 of the above, the upper surface is laid on a base 12 made of asphalt concrete or concrete having a substantially smooth surface with a cushioning material 13 such as rubber interposed therebetween. . The artificial lawn 11 is made of a synthetic resin yarn such as nylon or polypropylene planted on a backing base cloth 14, and the grass 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 portion of the artificial lawn 11 is hung on the side surface of the curb 16 on the side of the home base 1 to provide an anchor or a soil that constitutes the peripheral portion 5. I try to hold it down with.

[0004]

As a result, even if the athlete slides, it is possible to prevent the spikes of the athlete from being trapped and locked in the filler layer. And soil is artificial grass 11
Not only did the artificial lawn 11 be brought out to the side, but the artificial lawn 11 was spoiled, and the softness of the original artificial lawn was impaired by the penetration of antuca and soil into the grass. Therefore, it is not only necessary to frequently perform maintenance to remove antuca and soil from the grass, but also daily routines such as roller compaction, water sprinkling, and leveling are required. Furthermore, covering each of the base peripheral parts 5 to 8 and the pitcher mound 10 with an antoka or soil is an extremely different part from the artificial grass 11 on the stadium, for example, soccer, rugby, hockey or American football. Cannot be used as is. Therefore, prepare an artificial lawn for these parts separately, and cover the surrounding area of each base and the pitcher mound with the artificial lawn for the cover when playing a game other than this baseball, and finish the entire ground with the appearance of an artificial lawn. However, there is a drawback that it is not easy to switch depending on the competition event.

Therefore, an object of the present invention is to construct an artificial lawn that is more slippery than an artificial lawn in other places, at least in places where it is not desirable to lock spikes of the athlete, such as places where sliding is performed. It is to provide an athletic field made of artificial grass that has solved the drawbacks.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an athletic stadium made of artificial grass whose surface layer is composed of an artificial grass in which a synthetic resin yarn is planted on a base cloth, and at least a portion where sliding is frequently performed. Is composed of yarns that have less frictional resistance than the artificial grass of other parts.

[0007] In this case, the grass lawn of the artificial lawn made of 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 is made of rubber or synthetic resin. You may comprise with a granular body.

[0008]

The yarn having a smaller frictional resistance than the other parts, that is, the slippery yarn, is present in a portion where sliding is frequently performed, such as around a base in a baseball, and a portion where a shaft foot is moved such as a pitcher mound. Since the artificial lawn made by is laid, sliding can be done easily and the pitcher's axial foot can be moved smoothly. In addition, when a game other than baseball is played, the game can be immediately entered.

Further, the sliding property can be improved by filling the turf with the filler, and the occurrence of scratches can be suppressed by using the filler as an elastic granular material of rubber or synthetic resin.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The constituent elements that are substantially the same as those in the conventional example described above are designated by the same reference numerals, and detailed description thereof will be omitted.

First, the first embodiment shown in FIG. 1 will be described. Peripheral portions 5 of each base on a base 12 constituted by a water-permeable structure laid with cobblestone or crushed rock or a water-impermeable structure such as concrete or asphalt. The whole ground except 8 and pitcher mound 10 is made by foaming rubber chips, urethane or polyethylene on site construction,
Cushioning material 13 formed by laying flat plate-shaped molded products
Is covered with. On this cushioning material 13, a number of flat straight-hair split yarns or monofilament yarns made of synthetic resin such as polypropylene or vinylidene chloride are planted on the backing base cloth 14 by tufting or the like. The lawn 21 is laid. The grass of the artificial lawn 21 is filled with a relatively hard filler 15 such as sand having a small particle size, silica sand, and ceramics. That is,
It is constructed in the same way as a conventional stadium made of artificial grass with sand. 5-8 peripheral parts of each base and 10 pitcher mounds
Is, for example, as shown in the peripheral portion 5 of the home base 1,
The artificial lawn 22 on the cushioning material 13 has a friction resistance smaller than that of the yarn of the artificial lawn 21. For example, a loft sliding resistance polyolefin yarn commercially available under the trade name "Thiolon LSR" from Titisee Polyolefins BV of the Netherlands is used as a backing base. A large number of cloth 14 is planted. On the other hand, inside the grass of this artificial lawn 22, the lower layer is filled with the above-described filler 15, and the upper layer is filled with the elastic granular material 23 made of rubber or elastic synthetic resin. In this case, it is preferable that the elastic granular material 23 has a round particle shape.

As described above, the peripheral portions 5 to 8 of the bases and the artificial lawn 22 of the pitcher mound 10 are made of a material in which the yarn itself is slippery, and the layer of the filler 15 which is the sand is elastic granular at the upper portion. Since the object 23 is filled, the spikes of the athlete are not locked by the filling material 23 due to the sliding, the sliding property is improved, and there is no fear of burns or abrasion due to sand, so that the sliding can be performed at ease. In addition, since each of the base peripheral parts 5 to 8 and the pitcher mound 10 are also covered with the artificial lawn 22, when switching from a game such as baseball or softball to a game such as soccer or rugby, they are immediately processed without any processing. Can play. Although the filling material of the artificial lawn 22 has a two-layer structure of a layer of the filling material 15 and a layer of the elastic granular material 23, it may be constituted by only the filling material 15 or 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 turf length of the artificial lawn laid on each of the base peripheral portions 5 to 8 and the pitcher mound 10 is made higher than that of the other portions, and the filling material is slid. It is designed to prevent runoff 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 parts, and the artificial grass 2 is inserted there through the cushioning material 24.
An artificial lawn 25 having a higher grass height than that of No. 1 is laid. As shown in the figure, the cushioning material 24 is provided with a number of recesses 26 on the lower surface facing the upper surface of the base 12 to make it softer than the cushioning material 13 below the artificial lawn 21. The artificial lawn 25 is made of the same yarn as the artificial lawn 22, and the stuffing method,
The length of the turf is secured by crimping by the air jet method or the shaping method such as compression or heat gear.
The artificial grass 25 is filled with a mixture of the filler 15 and the elastic granular material 23 as grain sand.

As described above, also in the second embodiment, the artificial grass 25 portion is more slippery than the artificial grass 21 portion to improve the sliding property, and the sand is also filled with the filler 15.
Since it is made of a mixture with the rubber and the elastic granular material 23, the contact is soft and it is possible to prevent not only burns but also scratches. Further, the cushioning material 24 has a large number of recesses 26.
Are provided to make the cushioning material 13 softer than the lower part of the artificial lawn 21, thereby increasing the safety during sliding. Furthermore, since the grass length of the artificial lawn 25 is made longer than that of the artificial lawn 21, even if the athlete slides around the base peripheral portion 5, the yarn is filled with the filler material 1.
5 and the elastic particles 23 can be held to prevent them from being washed away. Further, since the yarn is crimped, the holding property of the filler 15 and the elastic particles 23 is improved, and the filler 15 and the elastic particles 2 by sliding are improved.
We are making sure to prevent the loss of water.

Needless to say, the artificial sand 25 of the artificial lawn 25 may have a two-layer structure in which the elastic granular material 23 is arranged in the upper part and the filler 15 is arranged in 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 below the artificial grass 25. Of course, this cushioning material 24 may be interposed below the artificial grass 22 of the first embodiment.

Next, the surface temperature of the artificial lawn of vinylidene chloride yarn and the artificial lawn of polyolefin yarn of low sliding resistance was measured by a burn evaluation tester developed in the Ono Laboratory of Tokyo Institute of Technology. Whereas the artificial lawn of was 10.2 ℃,
The artificial lawn of polyolefin yarn showed a temperature as low as 1.3 ° C. From this result, it was found that the artificial lawn made of polyolefin yarn is unlikely to be burned even when sliding. Next, two artificial lawns of nylon yarns having the same pile density were prepared, one of which was filled with sand and the other of which was left without sand, and the surface temperature was measured by the burn evaluation tester described above. As a result, 1.1 ° C with sand
However, without sand, the temperature was as high as 2.7 ° C. From these two experiments, it was found that the friction heat can be kept low and the possibility of burns can be reduced by constructing an artificial lawn with yarns of low sliding resistance and by adding sand.

Further, the coefficient of static friction was measured for the artificial lawn made of nylon yarn when only the rubber elastic particles were used as the filler and when only sand was used as the filler. In the test, the load was 3 kg, and a nylon trunks fabric was used for the test piece. As a result, it was as high as 0.51 in the case of only the rubber elastic particles and 0.59 in the case of only the sand, which revealed that the sliding property was also excellent. Also. After a sliding experience by a soccer player and a sensory evaluation of the sense of security against scratches, it was evaluated that the rubber elastic granules alone would be reassuring, but the sand alone would cause anxiety.

From these experimental results, it is possible to slide safely by using an artificial lawn where the sliding place is slippery than other parts, and it is easier to slide in by inserting the sand into the sand. It has been found that the occurrence of scratches can be suppressed by replacing the body.

In each of the above-mentioned embodiments, the sand-containing artificial lawn has been described as an example. However, even in the case of the sandless artificial lawn, the artificial lawn at the place where sliding is performed is composed of yarn that is slippery than the artificial lawns of other parts. By doing so, the same effect can be obtained. In addition, as another means for making it slippery, by making the tuft density of the artificial grass of that portion smaller than that of the artificial grass of other portions, the movement can be facilitated and the frictional resistance can be reduced.

[0020]

INDUSTRIAL APPLICABILITY As described above, the artificial lawn athletic stadium of the present invention has a high frequency of sliding, such as around the base in baseball, and the movement of the axial foot like the pitcher mound. Since the part to be broken is made of yarn that has less frictional resistance than the artificial grass of the other part, sliding can be done easily and the pitcher's axial foot can be moved smoothly. Further, as compared with the case where these parts are made into an antuka or soil as in the conventional case, it is possible to switch to a game such as soccer or rugby without any action.

Further, as described in claim 2, the sliding characteristics are improved by filling the grass of the artificial lawn of the yarn having the small frictional resistance with the filler composed of the sand having the small particle size and the synthetic resin. If the filler is made of rubber or a synthetic resin elastic granular material as described in claim 3, the occurrence of scratches due to sliding can be suppressed.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view showing the main parts of a second embodiment of the artificial lawn sports stadium of the present invention.

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

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

[Explanation of symbols]

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

Claims (3)

[Claims] 1. In an athletic field made of artificial grass having a surface layer composed of artificial grass in which synthetic resin yarns are planted on a base cloth, at least a portion where sliding is frequently performed, an artificial grass of another portion is used. An artificial lawn athletic stadium characterized by using an artificial lawn made of yarn that has less frictional resistance than the lawn. 2. The filling material made of sand or synthetic resin having a small particle size is filled in the grass of the artificial lawn of the yarn having a small frictional resistance. Artificial lawn athletic stadium. 3. The artificial lawn sports stadium according to claim 2, wherein the filler is made of elastic granular material of rubber or synthetic resin.