JPS5924004A - Athletic field made of artificial turf - 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 The present invention relates to an athletic field made of artificial grass.

Generally, artificial lawns are made of flat pile threads made from synthetic resins such as polyamide, acrylic, vinylidene chloride, or polypropylene, which are grafted onto a backing fabric using various methods. The pile length and turf density will vary slightly depending on the field of application, such as a tennis court or soccer field, but the length is generally 7 mm to 12 m.
It is around m. Artificial lawns have become rapidly popular in recent years because they are more durable and easier to maintain than natural lawns, but there are still issues that need to be resolved in terms of their characteristics and construction. is left behind. It has been reported in prior art that by filling the grains of an artificial lawn with dried sand (mineral particles), the characteristics of the artificial lawn can be made to more closely resemble those of a natural lawn. Although this dry sand satisfies the buffering capacity of the artificial lawn and the ability to prevent spikes from getting caught, the following points need to be taken into account. In other words, in order to increase the water retention capacity of this sand layer, the finer the particle size, the better, but if too fine sand is used, it will harden over time and the proper cushioning properties will be lost. The sand is blown up by the wind before or after the installation process, which is unfavorable in terms of occupational safety and health and environmental health. This dust generation is particularly problematic in the case of in-l lure coats.

For this reason, in the past, soil fixatives were sprinkled on top of the filled sand layer to harden the surface, or the grain size of the sand was kept to a certain level, and moisture retaining agents such as hermiculite and chloride were used instead. Some ingredients are mixed in. However, the method using a soil fixative is not very permanent, is troublesome in terms of maintenance and management, and is not preferable in terms of cost.

On the other hand, as for the moisture retaining material, it takes a lot of effort to mix it into the sand layer, and there remains the same cost problem as in the former case. On the other hand, it is also necessary to pay attention to measures to protect the ground during rainfall. This is not so much of a problem if the ground is made of asphalt concrete, but if the ground is made of crushed stone and/or sand, it is preferable to use stabilization treatment, which is relatively inexpensive. This is because the stability is gradually lost due to the infiltration of the material, causing it to become soft, and there is a risk that the tread may become uneven due to the load.

Therefore, the purpose of this invention is to have characteristics that are similar to natural grass in terms of buffering capacity and ability to prevent spikes from getting caught, as well as water retention capacity, easy construction, and very little dust generation due to wind, etc. The object of the present invention is to provide an artificial grass sports field with a sand layer.

The above object is achieved by filling the turf of an artificial lawn with dry sand containing 90% or more of particle size within the range of 100 mesh to 14 mesh. Further, the present invention is provided with an impermeable base fabric in order to prevent softening of the ground, which is preferably stabilized and made of crushed stone, sand, etc., due to penetration of rainwater.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows a sectional view of an athletic field according to the present invention, which is constructed by laying an artificial turf 2 on a stabilized ground 1 and filling the turf with dry sand 3. Ground 1 is prepared using a known soil stabilization method, that is, by mixing crushed stone and/or sand with a stabilizing agent such as cement or quicklime, and adding an appropriate amount of clay as a moisture donor if necessary. It is formed by leveling and rolling until the top surface is substantially flat. The artificial lawn 2 includes a lining fabric 4,
It consists of pile threads 5 planted on this base fabric 4. In this case, the base fabric 4 is water-impermeable to substantially prevent rainwater from penetrating into the ground J. This water impermeability can be obtained, for example, by kinking the base fabric 4 with a comb or urethane resin.

It can be made from various synthetic resins, but it is more similar to natural grass in terms of appearance and texture, and considering durability, polyamide 1-, polyethylene terephthalate 1-,
Polyurethane, polyvinylidene chloride, polylopyrene,
Alternatively, acrylic resin is preferable, and it is made from slit yarn obtained by cutting a film of such 41] fat into thin pieces, or a flat yarn formed by melt spinning through a nozzle having irregular cross-sectional holes. This artificial lawn 2 is a tennis court.

Considering that it is used instead of conventional natural grass in soccer fields, baseball fields, etc., the pile length is 1.
Preferably it is between 0m1 and 40m1. In the present invention, the dry sand 3 has a particle size of 100 mesh to 14 mesh (
Contains more than 90% of sand within the range of about 0.5 mm to about 12 mm).

In other words, sand with a grain size of less than 100 mS tends to be gradually compacted by the pressure of the competitors, and there is also a risk that it will become dusty and fly up.
Especially for indoor facilities.

Unfavorable in terms of occupational safety and health and environmental health. On the other hand, when the grain size of the sand is within the above range, when the wind friction speed is about 1.5 cm per second (the wind speed at 1 m above the ground is equivalent to 4 m per second), the anti-sand effect of the pile yarns 5 is not compatible. It is hardly blown away by wind, and in addition, finer sand has a tendency to settle to the bottom, while coarser sand tends to rise upwards, so from this point of view, it is difficult to blow away by wind. is effectively prevented.

On the other hand, in relation to the particle size, mustard results in both water retention capacity and drainage performance being somewhat satisfactory.

Therefore, it is possible to retain an appropriate amount of moisture without the need to mix in moisture retaining materials such as hermuculite or chloride, and soil fixing agents can also be applied to prevent sand from being blown away by the wind. There will be almost no need for it. In addition, in order to more effectively prevent sand from being blown away by the wind, the second
As shown in the figure, the ends of the pile yarns 5 are curled downward so as to press against the surface of the dry sand 3. The dry sand 3 has a length of 80% of the length of the pile yarn 5.
This artificial lawn 2 is filled with a thickness of 110% to 110%. Please note that this figure is at the time of completion of construction.
Does it actually change over time due to rainfall or treading pressure? The level drops and stabilizes after about a month. The layer thickness is selected in relation to, for example, the bouncing characteristics of the ball, the aesthetic appearance of the artificial lawn 2, and the like. That is, as shown in Fig. 3, if a large amount of sand 3 is added so that the tip of the pile thread 5 is hidden, the pile thread 5 will stand up straight and be rigid, and the bounce of the ball will be higher as shown by the arrow in the figure. Further, since the pile threads 5 are protected by the sand 3, the durability is improved, but on the other hand, the green color of the artificial lawn 2 becomes less noticeable, resulting in a slightly inferior aesthetic appearance.

On the other hand, as shown in FIG.
By exposing the tip of the ball, the playing surface becomes more flexible.
As a result, the bounce of the hole becomes lower as shown by the arrow in the figure.

Furthermore, the tips of the pile yarns 5 curl due to the stepping pressure of the contestant, making the green color more noticeable and aesthetically pleasing, but conversely, the pile yarns 5 wear out more quickly. Incidentally, pile yarns made of polypropylene resin tend to curl more markedly, and are more useful in pressing the surface of the sand layer and preventing it from scattering.

As is clear from the description of the embodiments described above, the grass according to the present invention contains 90% or more of sand with a particle size in the range of 100 mesh to 14 mesh in the turf grains, that is, between the pile yarns. By filling with dry sand, there is less sand scattering during and after construction, and there is no need to spread soil fixing agent to harden the surface of the sand layer as in the past. Furthermore, since it exhibits a good value for water retention capacity, there is no need to mix in a moisture retention material such as vermiculite, and therefore it is easy to construct and is advantageous in terms of cost. On the other hand, since the base fabric 4 of the artificial lawn 2 is water-impermeable, softening of the stabilized ground due to penetration of rainwater is prevented, and the ground can be stabilized for a long period of time. This means that, for example, when renovating a clay court or antuca court, artificial turf can be laid directly on the underlying surface without forming an asphalt concrete floor again, and it can be constructed at a low cost. be.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment according to the present invention, and FIG.
The figure shows a modified embodiment, a sectional view of the main part, and Figures 3 and 4.
The figure is a cross-sectional view for explaining the relationship between the amount of sand filled and the bounce of the ball. In the figure, 1 is the ground, 2 is the artificial grass, 3 is the dry sand, 4 is the base fabric, and 5 is the pile yarn. Patent applicant: Sumitomo Rubber Industries, Ltd. Representative Patent Attorney Takuya Ohara April 1982
July 7th, Commissioner of the Japan Patent Office Kazuo Wakasugi, 1988 Patent Application No. 13326 July 2nd, Name of the invention Artificial Grass Athletic Stadium 3, Relationship with famous case to be amended Patent applicant: Chuo Ward, Kobe City, Hyogo Prefecture Sumitomo Rubber Industries Co., Ltd. 1-1-1 Tsutsui-cho Representative Yokose Kuya 4, Agent (102) 5. Date of amendment order (self-initiated) Showa date, month, day (shipping date; month, day, same year)
6. Column 4 of "Claims" and "Detailed Description of the Invention" in the specification subject to amendment. 7. Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. (2) In the specification, page 3, line 9, and page 9, line 3, the words "sanshu" are corrected to "sanshu", respectively. Attachment [i'2, Claims (1) An artificial lawn is laid on a ground made of crushed stone and/or sand that is formed substantially flat, and dry sand is sprinkled within the grass grains. At an athletic stadium made of artificial turf. An athletic field made of artificial grass, characterized in that the dry sand contains 90% or more of particles with a particle size in the range of 100 mesh to 14 mesh. (2) The artificial lawn is characterized in that it consists of a water-impermeable base fabric and pile yarns having a length of 10nwn to 40n that are planted on the base fabric. Artificial grass athletic field listed in item 2.

Claims (3)

[Claims] (1) In an artificial turf athletic field, which is constructed by laying an artificial turf on a substantially flat ground made of crushed stone and/or sand, etc., and removing dry sand into the turf, The artificial grass sports stadium is characterized in that the dry sand contains 90% or more of particle size within the range of 100 mesh to 14 mesh. (2) Claim 1 characterized in that the artificial lawn consists of a water-impermeable base fabric and pile threads having a length of 10 mm to 40 mm planted on the base fabric. Artificial grass athletic field as described. (3) The artificial lawn according to claim 1, characterized in that the dry sand is filled in the grain of the artificial lawn to have a layer thickness of 80% to 110% of the pile length. Lawn athletic field.