JPS5924008A - 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.

In general, artificial lawns are made of flat pile threads made from synthetic resins such as polyamide, acrylic, vinylic acid 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 playing field to which it is applied, such as a tennis court or soccer field, but the length is approximately 7mm.
It is around 2 inches. 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 to be solved regarding their characteristics and construction. Challenges remain. It has been reported in prior art that by filling the grain of an artificial lawn with dried sand (mineral particles), the characteristics of the artificial lawn can be approximated to 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, many of these types of sand-containing artificial lawns are installed on a ground made of crushed stone and/or sand that has been stabilized with a stabilizing agent such as cement or quicklime, but this ground is relatively Since it has good water permeability, there is a risk that its stability will gradually decrease by 4μ due to the penetration of rainwater, causing it to become soft. In addition, since the ground is permeable,
There were problems in that the overall water retention capacity tended to be low and dust was likely to be generated.

Therefore, an object of the present invention is to provide an artificial grass athletic field in which the stability of the stabilized ground is maintained over a long period of time and which has good water retention performance.

The above object is achieved by making the base fabric of the artificial lawn impervious to water and by placing a nonwoven fabric between the base fabric and the stabilized ground.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

This athletic field consists of ground whose upper surface is substantially flat】(!-1 Artificial grass 2 laid on this ground 1,
The artificial lawn 2 includes dry sand 3 filled in the grass grains. In this embodiment, the ground 1 consists of stabilized crushed stone and/or sand. In other words, 1? f Stone and/or sand is mixed with a stabilizing agent such as cement or quicklime, and if necessary, an appropriate amount of clay as a moisture donor is added and then leveled until the top surface is substantially flat. Formed by rolling. The artificial lawn 2 consists of a backing base fabric 4 and a pile yarn 5 planted on the base fabric 4. In this case, the base fabric 4 is made of crushed stone and/or sand that has been stabilized on the ground 1. It is made to be non-water permeable in order to prevent its stability from being weakened and weakened by the penetration of rainwater. It is obtained by kinking it to the base fabric 4.In the present invention, a non-woven fabric that can absorb water well is provided directly under the base fabric 4, that is, between the base fabric 4 and the ground 1. has been done.

The pile yarn 5 can be made from various synthetic resins, but it is more similar to natural grass in terms of appearance and texture, and
In consideration of durability, polyamide, polyethylene terecrate, polyurethane, polyvinylidene chloride, polypropylene, or acrylic resins are preferred, and SURIN 1-A is made by cutting a film of these resins into thin pieces, or it is made into irregular shapes by melt spinning. It is made from a flat thread formed through a nozzle with an aperture of 1 mm. 0) Considering that the artificial grass 2 is used in place of conventional natural grass in tennis courts, soccer fields, baseball fields, etc., it is preferable that the pile length is 10 mm to iomm. In this embodiment, the dry sand 3 (1) contains 90 or more pieces of sand having an average particle size in the range of 100 mesh to 14 mesh, preferably as shown in the figure.

It has a two-layer structure: a lower layer 7 made of fine sand filled on a base fabric 4, and an upper layer 8 made of coarse sand layered thereon. In this case, fine sand has a particle size of 100 mesh to 28 mesh (about 0.074 m to about 0.6 m).
rl) is defined as containing preferably 80% or more sand, while coarse sand is defined as containing preferably 80% or more sand of
mesh (approx. 0.21 mm to approx. 1.2 mm)
It is defined as containing preferably 80% or more of sand. This dry sand 3 is spread on the artificial lawn 2 and filled into the grass grain, but since the coarse sand 8 having the particle size range described above is layered on the soil of the lower layer 7 consisting of fine sand, Overall, there is little risk of it being blown away by the wind. In addition, due to the particle size and θ) relationship, there are more voids that can contain water, so there is no need to mix water retaining agents such as hermyculai 1- or trichloride as in the past. Water retention capacity is indicated. On the other hand, the layer thickness of the dry sand 3 including the upper layer 7 and the upper layer 8 is about 70% to 11% of the length of the pile yarn 5.
Approximately 0% is appropriate. Note that this figure is based on the time of completion of construction, and in reality, the level decreases due to rainfall and tread pressure, and remains stable for about a month. Therefore, the layer thickness is selected in relation to, for example, the bounce characteristics of the hole and the aesthetic appearance of the artificial lawn. In other words, if you add a lot of sand to the point where the ends of the pile threads 5 are covered, the pile threads 5 will stand upright and become rigid, which will increase the bounce of the hole and improve durability. On the other hand, the green color of the artificial lawn 2 is less noticeable and the aesthetic appearance is improved.On the other hand, add a little sand 3; use a comb to make the tips of the pile threads 5 protrude from the top of the sand layer. This will make the playing surface more flexible and lower the bounce of the hole.
Although the green color of artificial lawn 2 stands out and is aesthetically pleasing,
On the contrary, the pile yarn 5 wears out faster. Note that the ratio of the layer thicknesses of the lower layer 7 and the upper layer 8 is appropriately determined by taking into consideration water retention and the like.

As is clear from the description of the embodiments described above, the present invention makes the artificial turf base fabric water impermeable, and a nonwoven fabric is placed between the water impermeable base fabric and the stabilized ground. By arranging the mat, the water retention capacity as a whole is greatly improved, and on the other hand, excess water coming up from the substrate is guided to the non-woven mat and drained laterally, resulting in stable water retention. Uneven settlement due to softening of the treated ground is more effectively prevented. In addition, by keeping the particle size of the dry sand to be filled within the above-mentioned range, and preferably by filling the bottom layer with fine sand and layering coarse sand on top, it is possible to reduce the amount of dust blown up by wind, etc. It can be made extremely small.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a portion of an artificial grass sports stadium according to the present invention. In the figure, 1 is the ground, 2 is artificial grass, 3 is dry sand, 4 (1
5 is a base fabric, 5 is a pile yarn, 6 is a nonwoven fabric mandrel, 7 is a lower layer, and 8 is an upper layer. Patent Applicant Sumitomo Com Industries Co., Ltd. Patent Attorney Takuya Ohara Procedural Amendment (Spontaneous) April 7, 1981 Patent Application No. 133271 2, Name of Invention Artificial Grass Athletic Stadium 36 Amendment Patent applicant 1-1-1 Tsutsui-cho, Chuo-ku, Kobe, Hyogo Prefecture Representative of Sumitomo Rubber Industries, Ltd. Yasushi Yokose Hei 4, Agent (〒102) 5, Date of amendment order zu (spontaneous) Showa year
6. Column 7 of Detailed Description of the Invention J in the specification subject to amendment; Contents of amendment

Claims (1)

[Scope of Claims] (1) A ground having a substantially flat upper surface, an artificial lawn laid on the ground, an impermeable base fabric, and an artificial lawn planted on the base fabric. an artificial lawn comprising pile threads having a length in the range of 10m to 40 m; and dry sand filled into the artificial lawn to a thickness of 75% to 110% of the pile length. It's a grass sports stadium. An athletic field made of artificial grass, characterized in that a nonwoven fabric is disposed between the ground and the base fabric. (2) The artificial grass sports field O according to claim 1, characterized in that the ground is composed of stabilized crushed stone and 7-year-old bamboo sand. (3+ The dry sand is The artificial grass sports field according to claim 1, characterized in that it contains sand with a particle size of 90 to 14 mesh on average.(4) The pile yarn. The artificial grass athletic field according to claim 1, characterized in that it is made of polypropylene resin.