JPH07158007A - Artificial lawn made athletic ground - Google Patents

Abstract

PURPOSE:To stabilize establishment conditions and improve safety by filling a lower layer composed of a granular hard filling material and an upper layer composed of a granular elastic filling material in grass meshes of a synthetic resin made yarn turfed on a ground fabric. CONSTITUTION:Laying of artificial lawn 1 on a base plate 2 composed of rubble stone or concrete through a cushioning material 3 of a foam body or the like is executed. The lawn 1 then has a synthetic resin made yarn 4 turfed on a lined ground fabric 5 and the grass meshes are filled with a lower layer 7 composed of a granular hard filling material 6 such as sand and an upper layer 9 composed of a granular elastic filling material 8 made of elastic synthetic resin. Mixing of upper and lower layers is restrained by making the true specific gravity of the filling material 8 smaller than that of the filling material 6. Further, the layer 7 is kept from being exposed to air by making the sprinkling thickness of the filling material 8 three times or more of its average grain diameter. Thus the lower part of the lawn makes a stable surface contact with the base plate and does not slide even if a violent impact is applied to it because the lower part is heavier as compared with the upper part, and not only can construction cost be reduced because it can be accomplished by laying them but chafes can be prevented as well.

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 field 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. The present invention relates to an artificial lawn athletic stadium filled with a filling material so that the lawn can be stabilized and the player can play in peace without scratching the player even when sliding or the like.

[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 artificial grass is used for a long period of time, it has advantages such as not impairing the cushioning property, the rolling performance of the ball does not change with time, and the athlete does not get scratched even if the player falls. is there. However, 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 size are filled in the lawn, are widely used. This sand-filled artificial lawn can prevent burns caused by yarns when slipping in, and when the athlete lands, the layer of the filling material changes to a plate shape and can provide a surface cushioning effect. Due to its weight, it can be laid down on the base, and the construction cost can be reduced.
However, in a sand-containing artificial lawn, there is a drawback that the filler exposed on the surface easily causes scratches when the athlete slides.

[0003]

Therefore, it was considered to prevent scratches by filling the filler with an elastic body such as rubber vulcanizate or urethane and filling it. However,
It has been found that when only such an elastic filler is filled, the artificial grass as a whole is too soft and the landing feeling is not stable, and the ball does not bounce properly in a ball game. In this case, if the grass length of the artificial lawn is shortened and filled with an elastic filler, the above-mentioned drawbacks are solved to some extent due to the hardness of the base layer of the artificial lawn, but such an elastic filler is light and artificial. The lawn cannot be stabilized, and the artificial lawn will shift if you repeat sliding, etc.In order to prevent it, it becomes necessary to bond the artificial lawn base fabric to the base layer, The advantage of reduction of construction cost due to construction is lost.

Therefore, an object of the present invention is to provide an artificial lawn athletic stadium which can be laid and constructed while preventing scratching due to sliding without impairing playability in various sports competitions.

[0005]

SUMMARY OF THE INVENTION The present invention is an athletic field made of artificial grass in which a synthetic resin yarn is planted on a base cloth, and the surface layer portion is constituted by an artificial grass filled with a filling material in the grass. In, the filler is composed of a lower layer of hard filler made of hard granules and an upper layer of granular elastic filler made of an elastic body located on the lower layer. It is what

In this case, the true specific gravity of the elastic filler is preferably smaller than that of the hard filler, and the thickness of the upper layer is preferably 3 times or more the average particle diameter of the elastic filler.
The elastic filler may be formed by coating a hard core with an elastic synthetic resin or rubber.

[0007]

[Function] Since the lower layer of the filler to be filled in the grass of the artificial lawn is made of a hard filler, the artificial lawn can have an appropriate weight, so that even if an extreme impact is applied. It is possible to stabilize without causing a deviation, and it is possible to carry out laying down and to reduce the construction cost. Further, since the upper layer is composed of the elastic filler, even if the player slides, the upper layer is in contact with the elastic filler having elasticity, so that abrasion due to sliding or the like can be prevented.

When the true specific gravity of the elastic filler is made smaller than that of the hard filler, when the filler is filled into the grass at the time of construction,
Prevents elastic fillers from mixing in the hard filler due to drainage caused by rainfall or water sprinkling when constructing an artificial lawn outdoors, and the elastic filler is not mixed in the hard filler to the upper part. And the hard filler can be stably positioned in the lower part.

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 the play, and at the same time, to provide the elastic filler. It is easy to do the filling work of.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, the first embodiment shown in FIG. 1 will be described. The artificial lawn 1 has a water permeable structure in which crushed stone or crushed rock is laid, or a base 2 made of concrete, asphalt, or the like, and foamed material such as rubber chips, urethane, or polyethylene. Is placed on-site, or is laid down via a cushioning material 3 configured by laying flat plate-shaped products. The artificial lawn 1 is constructed by laying a large number of flat straight-hair split yarns or monofilament yarns 4 made of a synthetic resin such as polypropylene or vinylidene chloride on a backing base cloth 5 by tufting or the like. ing. On the lower part of the lawn of the artificial grass 1, a lower layer 7 is formed by filling a hard filler 6 such as sand, silica sand, ceramics, glass beads or mineral particles having a fine particle size in the lower part, and on the lower layer 7. There is provided an upper layer 9 configured by filling a granular elastic filler 8 made of an elastic synthetic resin such as rubber vulcanizate or urethane resin to be filled. The elastic filler 8 may be made of hard particles such as sand or ceramics as a core, and the outer side of which is covered with elastic rubber or rigid resin.

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 hitting the lower layer 7 are provided, sliding or the like is performed. It is possible to prevent the player from being scratched even when performing. Further, not only the elastic force and safety of the cushioning material 3 provided in the lower part of the artificial lawn 1 but also the elastic filler 8 forming the layers can contribute to the elastic force and safety. Furthermore, the artificial grass 1 can be positioned so as to be pressed against the base 2 by the relatively heavy lower layer 7, and it can be laid down without shifting even with extreme movements such as sliding, and construction costs can be reduced. It can be reduced. Although the upper layer 9 and the lower layer 7 are clearly separated in the above-described embodiment, the upper layer 9 and the hard filler 6 of the lower layer 7 are dispersed by the elastic filler 8 and the subsequent spreading. However, the elastic filler 8 of the upper layer 9 may be mixed in the lower layer 7 to some extent, and the effect is not significantly changed even if it is mixed in such a small amount, and the upper layer 9 and the lower layer 7 are distinctly mixed. There is no need to separate the and.

Next, the specific densities 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 the mobility and movement caused by rainwater or wind was examined. That is, the following four types of specific examples were made, and the flowability of rainwater for the filler of the upper layer, the mobility of wind by the wind, and the condition of the upper and lower layers after exercise were examined. The results are shown in Table 1.

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

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.

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

Concrete Example 4: Concrete Example 3 of the elastic filler for the upper layer
In the same manner as above, the lower layer hard filler was composed of an epoxy resin powder having a true specific gravity of 1.3.

Each of the concrete examples had a size of 2 × 2 m, and they were installed on the roof. In addition, in each of the specific examples, two types of spraying thicknesses of the elastic filler of the upper layer were prepared: 3 mm and 5 mm.

[0018]

[Table 1] The examination of the mobility by rainwater and wind was visually confirmed after leaving it for 3 months. The water gradient is 1/10
It is 0. Also, regarding the stability of the filler due to the exercise, any exercise is similarly performed on the artificial lawn of each concrete example, the state after that is visually observed, and the artificial state of each concrete example is also displayed on the passage. The lawn was constructed, the time-dependent change due to walking was observed, and it was judged from the state of both.

From Table 1, if the true specific gravity of the hard filler is heavier than the true specific gravity of the elastic filler, the upper and lower layers are not mixed together, and if the true specific gravity is 1 or more, the elastic filler is stable. understood. It was also found that the lower layer is not exposed when the dispersion thickness of the elastic filler is 3 times or more the average particle size.

[0020]

INDUSTRIAL APPLICABILITY As described above, the artificial lawn sports stadium of the present invention is made of the lower layer of the hard filler made of hard granular material and the elastic body located on the lower layer. Since it is composed of an upper layer of granular elastic filler, the lower part of the artificial lawn becomes heavier than the upper part, and it is possible to make stable surface contact with the base such as a base, and it is possible to apply an extreme impact. It is possible to carry out laying and to reduce the construction cost without any deviation. Further, since the upper layer is composed of the elastic filler, even if the player slides, it comes into contact with the elastic filler having elasticity, so that abrasion due to sliding or the like can be prevented.

Further, as described in claim 2, by making the true specific gravity of the elastic filler smaller than that of the hard filler, when the artificial lawn is constructed outdoors, the hard filler is caused by drainage caused by rainfall or water sprinkling. It is possible to prevent the elastic filler from flowing into the inside, and to stably position the elastic filler on the upper side and the hard filler on the lower side without mixing the elastic filler in the hard filler.

Further, as described in claim 3, by making the thickness of the upper layer 3 times or more the average particle diameter of the elastic filler, it is possible to prevent the hard filler of the lower layer from being exposed during the play. In addition to being able to do, it is easy to perform the work of filling the elastic filler.

[Brief description of drawings]

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

[Explanation of symbols]

 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

Claims (4)

[Claims] 1. A synthetic resin yarn is planted on a base cloth,
In an athletic stadium made of artificial grass whose surface layer is composed of artificial grass filled with filling material, the filling material is a lower layer of hard filling material made of hard granules and is located on this lower layer. An artificial lawn athletic stadium characterized by being composed of an upper layer of granular elastic filler made of elastic body. 2. The athletic stadium made of artificial grass according to claim 1, wherein the true specific gravity of the elastic filler is smaller than that of the hard filler. 3. The artificial lawn sports stadium according to claim 1, wherein the thickness of the upper layer is three times or more the average particle diameter of the elastic filler. 4. The athletic stadium made of artificial grass according to claim 1, wherein the elastic filler has a hard core covered with an elastic synthetic resin or rubber.