JPS5924005A - 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 pentachloride, or polyglopylene, which are grafted onto a backing fabric using various methods.The pile length and turf density vary. The length varies slightly depending on the playing field to which it is applied, for example a tennis court or a soccer field, but the length is generally 7 to 12 mm.
Before and after.

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 grain of an artificial lawn with dried sand (mineral particles), the characteristics of the artificial lawn can be made to more closely resemble that of a natural lawn. Although this dry sand satisfies the artificial lawn's conflicting ability and ability to prevent spikes from getting caught, the following points need to be taken into account:
・. In other words, the finer the grain size is, the better in order to increase the water retention ability of this sand layer, but if too fine sand is used, it will harden over time and will impair proper shoe/reedability. In addition, the sand filling process is old, or the sand is blown up by the wind after construction, which is unfavorable in terms of occupational safety and health and the environment.

This dust generation is particularly a problem in the case of Inn I/Aco-1. For this reason, conventional methods have been to spread soil fixatives from the soil in the filled sand layer to harden the surface, or to reduce the grain size of the sand to a certain level and use hermiculite, calcium/nium chloride, or other moisture-retaining agents instead. Sometimes holding materials are mixed in.

However, from ff, the method using soil fixatives is not very permanent, is troublesome in terms of maintenance and management, and is not preferable in terms of cost. On the other hand, when it comes to moisture retaining materials, it takes a certain amount of effort to mix them into the sand layer, and
Similar to the former case, a loss 1- type problem remains.

Therefore, the purpose of the present 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, which is easy to install, and which is highly resistant to dust generation due to wind, etc. An object of the present invention is to provide an athletic field made of artificial turf and having a reduced sand layer.

The above object is achieved by forming a lower layer of fine dry sand below the grain of the artificial lawn, and filling and layering coarse dry sand thereon.

In this case, the fine dry sand is 100 mesh to 28 mesh.
The coarse dry sand preferably contains 80% or more of particles with a grain size of 70 to 14 mesh.

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

This athletic field consists of a ground 1 whose upper surface is finished substantially flat, an artificial lawn 2 laid on this ground 1, and dry sand 3 filled in the grass grains of this artificial lawn 2. We are prepared. In this embodiment, the ground 1 consists of stabilized crushed stone and/or sand. That is, crushed 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 the mixture is leveled and the two sides are substantially flat. It is formed by the hardness of rolling. However, unlike the illustrated example, the ground 1 may have an impermeable structure made of asphalt concrete of dense grains, fine grains, etc.

The artificial lawn 2 consists of a backing base fabric 4 and pile threads 5 planted on the base fabric 4. In this case, the base fabric 4 is
It is made of crushed stone and/or sand that has undergone stabilization treatment, and is made impermeable to prevent its stability from being weakened and weakened by the infiltration of rainwater. This water impermeability can be obtained, for example, by para-kinking a comb or urethane resin to the base fabric 4.

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 considering durability. Vinyritine, polypropylene, and Mosik are made from acidic acrylic resins, and are made from slit yarns made by slicing films of these resins, or from flat yarns formed by melt spinning through nostles with irregular cross-sectional holes. . Considering that this 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 40 mm. According to the present invention, the dry sand 3 has a two-layer structure including a lower layer 6 made of fine sand filled on the base fabric 4 and an upper layer 7 made of coarse sand layered thereon.

In this case, fine sand has a particle size of 100 to 287 mm (approximately 0.15 mm to approximately 0.6 m).
Coarse sand is defined as containing preferably 80% or more of sand with a grain size of 70 mesh to 14 mesh (about 0.21 mm to about 1.2 mm). It is defined as including the above. This dry sand 3 may be spread on the artificial lawn 2 and filled into the grass grains, or the particle size of the sand 3 is finer than 100 mesh, and it tends to be gradually compacted by the pressure of the players. There is a risk that it may fly up as dust, which is unfavorable from the standpoint of occupational safety and health and environmental health, especially in indoor facilities. In view of this,
In this invention, the particle size of the fine sand used in the lower layer is within the above range, thereby reducing the friction speed of the wind to 15 c/s.
m (wind speed at 1 m above the ground corresponds to about 4 m/s), combined with the anti-sand effect of the pile yarns 5, there is almost no blowing away, and therefore, especially during construction, the amount of dust generated is extremely small. Furthermore, considering the relationship with the particle size, the water retention capacity and drainage performance were also satisfactory to a certain extent, and the fact that water retention materials such as vermiculite and lucium chloride were not mixed in was almost comparable to that of conventional methods. It shows good water retention capacity. In addition, since the coarse sand of the above particle size range is layered on the lower layer of fine sand, there is little risk that the entire scale will be blown away by the influence of the wind. On the other hand, the layer thickness of the dry sand 3 including the lower layer 6 and the upper layer 7 is approximately 70% to 1% of the length of the pile yarn 5.
Approximately 10% is appropriate. Please note that this value is based on the time of completion of construction, and in reality, the level decreases over time due to rainfall and tread pressure, and remains stable for about a month. The layer thickness is selected in relation to, for example, the bouncing characteristics of the poles and the aesthetic appearance of the artificial lawn. That is, pile yarn 5
Add enough sand to cover the tip of the pile thread 5.
Since the grass is upright and rigid, the bounce of the hole is increased and the durability is improved, but on the other hand, the green color of the artificial grass 2 becomes less noticeable and the aesthetics are slightly inferior. On the other hand, if the amount of sand 3 is reduced so that the tips of the pile yarns 5 protrude from the top of the sand layer, the playing surface becomes more flexible and the bounce of the poles is lowered.In addition, the green color of the artificial lawn 2 stands out and is aesthetically pleasing. Although this is preferable from a practical standpoint, the pile yarn 5 wears out more quickly. In addition,
The ratio of the layer thicknesses of the lower layer 6 and the upper layer 7 is appropriately determined by taking into consideration water retention and the like.

As is clear from the description of the embodiments described above, according to the present invention, 100% of grass is applied to the turf grains of one artificial lawn, that is, between the pile threads.
Sand with a grain size within the range of 0 mesh to 28 mesh
The lower layer consists of fine sand containing 0% or more, and 70 mesh ~
] By stacking the upper layer of coarse sand containing 80% or more of sand within the range of 4 M/U, it is possible to spread the sand on the artificial lawn and fill it into the grass grains. The amount of airborne particles is small, and there is little risk of causing occupational safety and health problems. In addition, since the fine sand in the lower layer is held down by the coarse sand in the upper layer, there is no need to spread a soil fixing agent on the sand layer to harden the surface of the sand layer in order to prevent the sand from scattering as in the conventional method.

Furthermore, since it does not exhibit a good value for water retention capacity, there is no need to mix water retention materials such as hermiculite or chloride. Therefore, it is easy to construct and is advantageous in terms of cost. On the other hand, by making the base fabric 4 of the artificial lawn 2 impermeable, rainwater is prevented from penetrating into the stabilized ground, and the ground can be stabilized for a long period of time.

This compactness means that, for example, when renovating a clay court or antuca, artificial turf can be immediately laid on the ground without having to re-form an asphalt concrete floor, and it can be constructed at a low cost.

[Brief explanation of the drawing]

The figure is a cross-sectional view showing a portion of an athletic field made of artificial grass according to the present invention. In the figure, 1 is the ground, 2 is the artificial lawn, 3 is the dry sand, 4 is the base fabric, 5 is the pile yarn, 6 is the lower layer, and 7 is the upper layer. Patent applicant: Sumitomo Com Industries Co., Ltd. Representative Patent Attorney Takuya Ohara April 1982
May 7, 1982 Patent Application No. 133268 26 Name of Invention Artificial Grass Athletic Stadium 3 Relationship with the Amendment Case Patent Applicant Sumitomo 1-1-1 Tsutsui-cho, Chuo-ku, Kobe, Hyogo Prefecture Rubber Industry Co., Ltd. Representative Yokose Kuya 4, Agent (102) 5. Date of amendment order (self-initiated) Showa date, month, day (shipment date; month, day, same year)
6. Column 7 of “Detailed Description of the Invention” in the specification to be amended, Contents of the amendment

Claims (4)

[Claims] (1) A base gate with a substantially flat upper surface, an artificial lawn laid on the base, and a base fabric with an area of 10 meters to 40 meters planted on the base fabric. The artificial lawn is made of a pile thread having a length of 7.
The artificial lawn is filled with dry sand with a thickness of 0 inches to 110%, and the dry sand includes a lower layer of fine sand layered on the base fabric, and a layer of coarse sand layered on the lower layer. This artificial grass sports stadium is characterized by its two-tiered structure. (2) The lower layer has a particle size of 100 mesh to 28 mesh.
Claim 1, characterized in that the upper layer contains 80% or more of sand with a grain size in the range of 70 to 14 grains. An athletic field made of artificial grass as described in paragraph 1. (3) The artificial grass sports stadium according to claim 1, wherein the ground is made of stabilized crushed stone and sand or sand, and the base fabric is impermeable to water. (4) The artificial grass sports stadium according to claim 1, wherein the ground is made of dense-grained or fine-grained asphalt concrete having an impermeable structure.