JP3372476B2 - Artificial grass ground - 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 ground, and more particularly to an artificial turf ground having a long pile length of artificial turf in a specific area where early wear is expected.

[0002]

2. Description of the Related Art In recent years, the number of construction examples such as baseball fields, soccer fields, and tennis courts on which artificial turf has been laid tends to increase. For example, as shown in FIG. 3, the artificial turf is formed by vegetating a large number of piles 1b made of a synthetic resin such as nylon or polypropylene on a base cloth 1a made of a plain polypropylene fabric or the like. Artificial grass 1 is laid on a flat base 2,
In order to get close to the appearance and performance of natural grass, sand, silica sand, elastic granular material of polymer material, or the like having a fine particle diameter of about 0.2 mm to 1.2 mm, if necessary, in order to approximate the appearance and performance of natural grass. The granular material 1c composed of the mixture of

What can be said almost in common with such artificial turf grounds is that the so-called large number of feet causes early wear 3 in a specific area. For example, in a baseball field, this early wear 3 occurs at the outfielder's defensive position,
It occurs near the baseline on tennis courts. When such early wear 3 occurs, conventionally, only that part was peeled off and replaced with a new artificial grass,
In addition to the large amount of labor and time required for the refilling work, the refilled portion is inevitably noticeable and is not desirable in appearance.

Therefore, in order to suppress local abrasion as much as possible, it has been proposed to increase the vegetation density of a pile of artificial turf at a place where abrasion is most likely, such as Japanese Patent Publication No. 1-57202.

[0005]

Increasing the vegetation density of the pile will certainly improve the abrasion resistance and suppress early wear, but the vegetation density will be partially dense and uneven, resulting in artificial turf materials. Even if the colors and colors are unified, the appearance will inevitably be different.

Furthermore, in athletic competitions such as tennis where ball bounce is the main component, the height of the vegetation density appears as the height of the bounce, which may have a considerable effect on play.

Further, since the difference in the vegetation density of piles has a great influence on the slipperiness of the shoes, the sense of discomfort at the feet is caused by the density of the vegetation density.

That is, although the problem of premature wear can be solved by increasing the density of pile vegetation near the base line of the tennis court, this time, play problems such as variation in boundness and discomfort in foot feeling occur. However, it can be said that this problem is serious due to the large number of legs.

An object of the present invention is to improve the wear resistance of an artificial turf ground without changing the movement performance such as ball bounding property and slipping property of shoes.

[0010]

In order to solve the above problems, the artificial turf gland of the present invention is expected to have early wear in the artificial turf gland in which the artificial turf having piled vegetation on the base cloth is laid on the base. Artificial grass in a specific area and artificial grass in other areas
Using the same pile as that used for, and, while making the pile length of the artificial grass in the specific area longer than the pile length of the other area, a base supporting the artificial grass in the specific area,
In order to make the finished surface of the artificial turf entirely flat, the concave surface was made to correspond to the pile length and lowered. As a result, the wear life is extended by the length of the pile.

Then, the artificial grass is usually filled with sand according to a standard method. The surface height of the sand is equalized including the specific area. The sand to be filled in the recesses in the specific region is not particularly limited, but it is preferable to make the particle size of the granular material on the lower layer side relatively smaller than that on the upper layer side. As a result, the "tightness" of the granular material can be hardened, and the bouncing property of the ball in the long pile length portion is improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
A description will be given based on (A) to (C). The artificial turf 1 shown in the figure is basically the same as the conventional artificial turf. A base fabric 1a made of a plain fabric made of a synthetic resin such as polypropylene is used, and a synthetic resin such as nylon or polypropylene is used. The pile 1b made of flat split yarns or monofilament yarns produced is vegetated at a uniform density. The pile 1b may be cut pile, loop pile or a combination thereof, or straight hair, crimped yarn or a combination thereof. The artificial turf 1 is laid on the base 2, but the base 2 may have a water-permeable structure in which chestnuts, crushed stones, etc. are spread, or a non-water-permeable structure such as concrete or asphalt. Also,
If necessary, a cushioning material layer such as a foam layer, a pavement layer made of an elastic material, or a non-woven fabric layer may be provided between the base cloth 1a and the base 2.

The artificial turf ground of the present invention is different from the conventional one in that the pile length is partially lengthened,
That is, the base 2 has a partially low concave surface 4 in the specific region S having a long pile length. The pile length of the artificial turf 1 laid on the concave surface 4 is relatively long. Therefore, in the finished state of the artificial turf 1, the surface P thereof is substantially flat regardless of the pile length.

The concave surface 4 may be formed in a single step as shown in FIG. 1 (A), or may be formed as a plurality of concave surfaces 4a, 4b in a multistage concentric annular shape as shown in FIG. 1 (B). In a specific area where early wear is expected, such as near the baseline of a tennis court, the central area of the area is particularly heavily worn, and the degree of wear decreases toward the peripheral area. Therefore, the deepest concave surface in FIG. 4a may be formed so as to coincide with the central portion of the specific region.

The artificial grass 1 has a grain size of, for example, 0.
Granules 1c composed of sand, silica sand, elastic granules of a polymer material, or a mixture thereof having a fine particle diameter of about 2 mm to 1.2 mm are filled.

In the artificial turf ground constructed with such a structure, the specific area S is worn away as shown in FIG. However, since the pile length of the artificial grass 1 laid in the specific area S is longer than the other parts, it takes time to expose the foundation 2 accordingly.

It should be noted that when the pile length is long, the influence on the ball bound may appear to some extent, though not to the extent of the difference in vegetation density. However, if necessary, in the specific region S, the upper layer side uses the granular material having the same particle diameter as the other portions, while the lower layer side uses the granular material having the smaller particle diameter, so that the “tightness” of the granular material is reduced. It can be hardened to compensate for the decrease in ball bound.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment and various modifications are possible. For example, in the above-mentioned embodiment, the concave surface 4 or 4a having a one-step or multi-step shape, Although 4b is formed, it is of course possible to form a continuously deep concave surface in a mortar shape. The concave surface or the pile length may be determined in consideration. Particularly, when the concave surface 4 is formed on the base 2 of the asphalt pavement 5 as shown in FIG. 2, it is preferable to use the step block 6.
Here, the step block 6 is a block body of a predetermined length solidified in a L-shaped cross section with a mineral material such as concrete, a synthetic resin, a rubber material, or the like, and an artificial grass between the concave surface 4 and other flat portions. It is convenient to eliminate the height difference of 1. Several kinds of step blocks 6 having different sizes, depths, etc. are prepared, these step blocks 6 are appropriately selected and fitted to the edge of the specific region S, and are continuously connected to the step horizontal surface 6a of the step block 6. By forming the concave surface 4 by doing so, efficient construction is possible. The concave surface 4 following the step horizontal surface 6a of the step block 6 may be the asphalt pavement 5 as shown in FIG. 2 or may be a simple roadbed without pavement. In addition, as a basic structure of the step block 6, FIG.
As described above, the flat plate block 7 on which the mortar 8 is added may be embedded, or the step block 6 may be simply placed on the roadbed. Further, in the present invention, only the artificial turf having a long pile length may be put in a specially made frame and the frame may be embedded in the base. This facilitates the construction of artificial turf and shortens the construction period.

[0019]

As described above, according to the present invention, the pile length of the artificial turf in the specific area, which is apt to wear early, is made longer than the other portions, so that the wear can be suppressed early. Moreover,
Unlike the pile vegetation density, the pile length does not affect the movement performance such as ball bouncing and slipperiness of shoes, so the entire surface of the artificial grass can be made uniform and a comfortable feeling can be maintained for a long time. .

[Brief description of drawings]

1A is a partial cross-sectional view of an artificial grass ground according to an embodiment of the present invention, FIG. 1B is a partial cross-sectional view of an artificial grass ground according to a modified embodiment of the present invention, and FIG. Partial cross-sectional view of the artificial turf ground in a worn state.

FIG. 2 is a partial cross-sectional view of an artificial grass ground according to a modified embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a conventional artificial turf ground in an early worn state.

[Explanation of symbols]

1 artificial grass 1a Base cloth 1b pile 1c granular material 2 foundation 3 Early wear 4,4a, 4b concave 5 asphalt pavement 6 step blocks S specific area

Claims (3)

(57) [Claims] 1. An artificial turf ground formed by laying artificial turf in which piles are planted on a base cloth on a base, artificial turf in a specific area where early wear is expected and people in other areas.
Using the same pile pile used in engineering turf, and the pile length of the artificial turf of the specific region, as well as longer than the pile length of the other regions, the foundation for artificial turf of the specific area, the artificial An artificial turf ground characterized by having a concave surface which is lowered corresponding to the pile length so that the finished surface of the turf is entirely flat. 2. The surface of the artificial turf is uniformly filled with particles having a predetermined particle size such as sand, and the particle size of the lower layer of the specific region is relatively smaller than that of the upper layer. The artificial turf ground according to claim 1, which is characterized in that. 3. A step block having an L-shaped cross section is fitted along an edge of the specific region, and the concave surface is formed so as to be continuous with a step horizontal surface of the step block. Artificial grass ground described in 1.