JPS6263701A - Artificial turf athletic field - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to greens for tennis courts, baseball fields, soccer fields, or golf courses that are constructed by laying artificial grass on the surface;
Concerning the improvement of the surface structure of sports stadiums such as teeing grounds or walking paths.

[Conventional technology]

In recent years, conventional soil athletic fields have had the disadvantage that rainwater, etc., significantly impede athletic activities, and the ground surface is significantly disturbed by athletic activities, so maintenance and management thereof requires a considerable amount of effort. In view of this, for example, athletic stadiums, especially baseball fields, are often used not only in Europe and America but also in Japan, where artificial turf is laid on the ground by pile fibers made of synthetic resin such as polyamide and flocked to the base fabric. .

However, recently, artificial turf at athletic fields, especially baseball stadiums, soccer stadiums, etc., has increased the fatigue level of players compared to natural turf, and moreover, there has been a steady increase in injuries at stadiums that use artificial turf. is reported. Of course, the cause and effect relationship has not yet been medically elucidated, but
The cause of this is that the spikes of players running across the artificial turf to catch a ball or run the bases pierce the grain of the artificial turf, which has countless pile threads planted on the strong backing fabric. When a player tries to stop quickly to catch or throw a ball, the artificial turf cannot absorb the huge load that is instantaneously applied through the sole of the shoe. It is assumed that this is due to the load placed on the ankles, knee joints, thighs, etc.

Therefore, in order to provide an effective solution to these problems,
Applicants have filed the application under Utility Model Publication No. 51-33472 (Registration No. 11).
No. 74148), one or more types of relatively hard granular materials such as soil, synthetic resin particles, wood powder such as sawdust, or mixtures used in Anzuka are added to the turf grains of artificial lawns. We have developed an athletic field (hereinafter tentatively named "artificial grass athletic field with sand") filled with a mixed covering material. According to this configuration, the hard granules such as the soil filled in the artificial lawn prevent the tips of the spikes from getting caught, and the granules also Through the flow of objects and mutual friction, the load applied by the soles of the players' shoes is absorbed, reducing the load on the human body.

In addition, since the soil rapidly absorbs rainwater on the grass and stadium surfaces, it has the advantage of reducing the tendency of the grass to slip when wet, and preventing the stadium surface from getting wet.

[Problem to be solved]

However, according to the applicant's experience in constructing a large number of athletic fields made of sand-containing artificial turf, it has been found that the covering material such as soil filled in the artificial turf is As time passes, sand (soil), etc., becomes gradually compacted due to repeated wet conditions such as rainwater and trampling by athletes, and as a result, the fluidity of sand (soil), etc., which is its characteristic, is lost. It has been found that there are cases where it becomes impossible to exhibit good shock absorption performance due to mutual frictional effects associated with this.

Therefore, the present invention provides a solution to the above-mentioned problems, and provides an artificial lawn in which the granules filled in the turf grains are not compacted forever, exhibiting an excellent shock absorbing effect, and which allows for comfortable competitions. The purpose is to provide a manufactured athletic field.

[Means for solving problems]

In order to solve the above-mentioned problems, the artificial grass athletic field according to the present invention is an artificial grass field that is constructed by erecting pile threads made of synthetic fibers on a base fabric on a substantially flat base. In an artificial turf sports stadium where grass is laid, instead of filling the turf with relatively hard granular materials such as soil, as in conventional sand-containing artificial turf sports fields, a solid-like ( Filled with one or more types of minute elastic granules made of rubber chips obtained by crushing vulcanized rubber (solid) or foam, or vegetable granules such as cork grains and crushed coconut shells. It is characterized by

The artificial turf used in the artificial turf sports stadium of the present invention is made of synthetic resin such as polypropylene, polyamide, polyurethane, polyvinylidene chloride, etc., and is made of numerous thin strips on a substrate by a molding method, similar to conventional ones. In addition to the structure in which strips are integrally formed upright, pile yarn is made from slit yarn obtained by slicing the film of the synthetic resin, etc., or flat yarn is made by melt spinning through a nozzle having irregular cross-sectional holes. A structure in which pile yarn is embedded in the base fabric is used.

The aforementioned microelastic particles have a thickness of approximately 8m++.
+ or about 1811Ill+, and the tip of the above lawn's leaves is about 2m1I! The granules are scattered and filled in such a way that they protrude from the surface of the layer for a length of about 8 ms+. However, the above-mentioned filling thickness is a guideline when the target is a tennis court, and may be increased or decreased as appropriate depending on the type of stadium (e.g., baseball field or Zarakar stadium), the type of pile yarn, the area weight, etc. . Further, the filling thickness is such that the granules filled in the grass grain are sufficiently stable.

[For production]

In the artificial turf sports stadium of the present invention, 1. Unlike the case of hard granules such as soil in conventional sand-containing artificial turf sports stadiums, each particle of minute elastic granules is filled in the turf grains. However, the stepping of the athlete prevents the granules from becoming compacted over time as they expand and contract under load.

Furthermore, as mentioned above, because the particulate matter is filled almost to the surface of the artificial turf, if the filling material is a relatively hard material such as soil as in the past, the player who falls may Although the sports stadium of the present invention is made of elastic granules, such injuries will not occur at all.

In addition to the above, by appropriately selecting and mixing the types of elastic granules from those mentioned above, and by appropriately selecting the particle size, it is possible to achieve an excellent cushioning effect depending on the type of athletic event. It can be demonstrated. Of course, it goes without saying that even in the athletic stadium of the present invention, an excellent impact absorption effect can be achieved due to the flow effect of the elastic granules and the accompanying mutual friction effect.

Note that the particle size of the elastic granules is preferably equal to or slightly smaller than the particle size of conventionally used sand from the viewpoint of filling efficiency.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 is an enlarged partial cross-sectional view of a tennis court to which the present invention is applied. Referring to the figure, in this example tennis court,
On the roadbed (4) formed by digging down the ground, a layer of fine-grained crushed stone (5) and a layer of dense-grained asphalt concrete (
A base (3) was constructed by laminating 6).

Next, after a polypropylene artificial lawn (1) with an average height of 26 cm is laid on the base (3), particles with a particle size in the range of about 28 to 200 mesh are placed in the grain of the lawn (1). Rubber chips (2) containing 90% or more have an average weight of 18+g
It was spread and filled to a thickness of m. In addition, a paving stopper block (7) is constructed around the base (3) and the artificial lawn (1), and the granular crushed stone layer (5) is further placed in the ground outside the block (7). A drainage ditch (8) has been constructed that communicates with the culvert.

In order to confirm the early drainage performance and compaction prevention effect of the rubber chip layer (2) in this example court with the above structure, a large amount of water was continuously sprinkled on the court to create an artificial lawn (1).
After repeatedly submerging the artificial turf (1) with water, we repeatedly conducted an experiment in which water was stopped, and in each case, the water receded from the artificial turf (1) layer after about 20 minutes, making it playable. No decrease in the level of f2) was observed.

On the other hand, when we conducted a questionnaire survey on the 10 players who played on this example court on a trial basis regarding their feelings of use, such as the speed and pound of the ball, the slippage of the sole, the feeling of cushioning, and the feeling of fatigue, we found that '' and ``Ball Bounce'' were answered by 2 people who answered ``some difficulties,'' and 1 person answered that ``Cushion Feeling'' was ``too soft.'' Overall, the feeling of use was as good as the conventional one. We received responses that it was as good as the "Sports Stadium Made of Artificial Grass Filled with Sand."

〔Effect of the invention〕

As explained above, the present invention provides an artificial lawn athletic event in which an artificial lawn constructed by erecting synthetic fiber pile threads on a base fabric is laid on a substantially flat base. Instead of filling the turf with relatively hard granular materials such as soil, as in conventional sand-containing artificial turf athletic fields, solid or foam vulcanized rubber is used. A granular material that is filled into grass grains by filling one or more types of minute elastic granules made of rubber chips obtained by crushing or vegetable granules such as cork grains and crushed coconut shells. To provide an athletic field made of artificial turf that is not compacted over time by the penetration of rainwater or the tread pressure of athletes, and which can exhibit an excellent shock absorbing effect over time and allows comfortable competitions. Can be done.

[Brief explanation of drawings]

FIG. 1 is an enlarged partial cross-sectional view of a tennis court to which the present invention is applied. The meanings of the reference symbols in the diagram are as follows; 1: Artificial lawn, 2: Elastic granules (rubber chips), 3: Foundation, 4: Roadbed, 5: Granulated crushed stone layer, 6: Dense-grained asphalt concrete. Layer, 7: Paving block, 8: Drainage ditch.

Claims (4)

[Claims] (1) In an artificial grass sports stadium where an artificial grass consisting of synthetic fiber pile yarn or the like is erected on the base fabric on a substantially flat base, the area within the grass is An athletic field made of artificial grass characterized by being filled with only minute elastic particles. (2) The artificial grass sports stadium according to claim 1, wherein the minute elastic particles are rubber chips obtained by crushing solid or foam vulcanized rubber. (3) The artificial grass sports stadium according to claim 1, wherein the minute elastic granules are vegetable granules such as cork grains and crushed coconut shells. (4) The artificial grass sports stadium according to claim 1, wherein the fine elastic particles are a mixture of rubber chips and plant particles.