JP2538259Y2 - Athletic stadium using artificial turf containing granular material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an athletic stadium using so-called artificial turf containing granular material, in which the grass of artificial turf laid on a base is filled with granular material such as sand.

[0002]

2. Description of the Related Art In an athletic stadium, lines such as white lines are generally drawn in a pattern corresponding to an athletic event. Conventionally, clay lime (calcium oxide,
Fine powders such as CaO 2), slaked lime (calcium hydroxide, Ca (OH) ₂ ), and calcium carbonate (CaCO ₃ ) are used, and slaked lime is often used. In the case where the powder is easily scattered as it is, a powder obtained by dissolving such a powder in water may be used.

[0003] On the other hand, in the case of drawing such a line in an athletic stadium using artificial turf containing granular material, conventionally,
In addition to slaked lime, which is the same as soil ground, etc., it is also known to use mineral particles such as sand and glass beads which are colored white by spraying lime powder (Japanese Utility Model Publication No. 61-31045) or to apply an aqueous paint. Have been.

[0004]

[Problems to be Solved by the Invention] By the way, in an athletic stadium where various kinds of sports are performed, it is necessary to change line marks according to the sports. Therefore, with this type of line mark, it is difficult to erase as much as possible during the competition or during the period when it is used for the same competition,
When it becomes unnecessary, it is necessary to be able to erase as easily as possible without any trace.

[0005] Fine powder such as slaked lime is excellent in hiding power (covering effect of the lower layer portion) due to the powder entering between the eyes of the earth and sand in a normal earth and sand stadium such as a clay court.
In addition, it is possible to draw a clear line that is hard to disappear to some extent, but in a stadium using artificial turf containing granular material, such fine powder is easily scattered and disappears, and is inferior in terms of hiding power. Also, even if such fine powder is dissolved in water, in the case of artificial turf containing granules, there are many gaps between the granules on the surface, and it is easy to move, so it will peel off immediately .

Further, in artificial turf containing granular material, fine powder enters between particles forming the granular material layer and causes clogging, and in some kinds of powder, the portion becomes hard due to hygroscopicity. There is also a problem that the reaction occurs and causes a petrochemical phenomenon. Furthermore, slaked lime is strongly alkaline, and thus has a problem in terms of health, as workers' hands are roughened or inhaled when flying.

[0007] Mineral particles, such as glass beads, coated with lime or pigment are the same in terms of scattering of lime powder, health problems, and clogging and petrification phenomena. When using mineral particles of the same particle size as the granular material used as the line particles, a clear line with a poor hiding power cannot be obtained,
In addition, it was confirmed that fine particles were deformed due to the flow of the surface layer of the granular material, and the line mark was deformed due to the influence of wind and rain over a certain period or more.

The present invention has been made in view of such a point, and in an athletic field using artificial turf containing granular material, if necessary, a line mark is stably maintained for a long period of time. It is an object of the present invention to provide an athletic stadium using artificial turf containing granular material that can be easily erased when unnecessary, and that does not easily cause clogging and the like, including the granular material-filled layer in the lower layer.

[0009]

Means for Solving the Problems In order to achieve the above object, in the present invention, a part of the surface layer of the granular material filling layer is provided with:
As a line mark member, a second granular material having a different color from the granular material is laminated, and the second granular material 9
0% or more of the particles are contained in a particle size range of 0.2 mm to 0.9 mm. Here, the color of the second granular material may be a material color itself of the granular material different from the color of the granular material of the base layer, or may be a color different from the granular material of the base layer by coloring. It may be something.

[0010]

The granular material of the base layer used for the granular material filling layer of the artificial turf containing the granular material generally has a particle size of 0.2 to 2.0 m.
m. The suitable particle size range of the second granular material for forming a line mark on the granular material of the base layer having such a particle size range was confirmed by experiments and the like, and as a result, 0.2
It was found that a material in which 90% falls within the particle size range of not less than 0.9 mm and not more than 0.9 mm is good.

That is, the particle size of the second granular material is 0.2 m
If it is less than m, it will be scattered by stepping during play, etc.,
The line becomes less clear due to repeated use, and clogging occurs due to penetration into the particles of the granular material of the base layer, and the solidification phenomenon easily occurs in that portion by repeated use for a long time. Further, when the particles used for the line mark have a small particle diameter, it is difficult to suck the particles, and it is difficult to erase the line.

In the artificial turf containing the granular material, the granular material-filled layer differs from the initial state due to the effects of wind and rain due to long-term use.
The movement of the granular material in this portion becomes unstable. The second granular material for a line mark, which is laid on the top of such a granular material-filled layer (base layer), has a function of suppressing the movement of particles in the surface layer portion of the base granular material and stabilizing the line. desirable. In order to suppress the movement of particles in the surface layer portion of the base layer granular material, it has been found that it is better to use a granular material finer than the granular material of the base layer as the second granular material. Then, in order to conceal the base layer portion and form a clear line, it is necessary to set the value of 0.
It is preferable to use those having a particle diameter of 9 mm or less, and those in which particles falling within the above particle diameter range are dominant in total,
Quantitatively, those with 90% of particles falling within the same range
The intended purpose can be achieved by using as a granular material.

[0013]

FIG. 1 is a partial sectional view showing the structure of an embodiment of the present invention. A base 1 made of asphalt or the like is placed on the ground G, and an artificial turf main body is laid on the base 1 via an underpad 2. As the underpad 2, a sheet-like material obtained by hardening a rubber chip with urethane or the like, a polyethylene foam sheet, or the like is used.

The artificial turf main body is formed by planting synthetic turf leaves 4 made of synthetic resin such as polypropylene or polyamide on the surface of a base cloth 3 made of, for example, polypropylene, and backing the back surface thereof by a pile-stopping process using rubber latex or the like. It was done. The grass of the lawn leaf 4 is uniformly filled with known minerals used in this kind of artificial turf, in addition to natural mineral grains such as silica sand, glass beads, etc. The filling layer 5 is formed. The particle size of the granular material used for the granular material packed layer 5 is 0.2 mm to 2.
It is about 0 mm. Although the thickness of the granular material layer 5 depends on the length of the lawn leaf 4, for example, when the length of the lawn leaf 4 is 25 mm, about 20 to 23 mm is commonly used.

A second granular material layer 6 made of calcium bicarbonate particles is laminated on the granular material layer 5 as a line mark. The particle size distribution of the calcium bicarbonate particles is such that the largest particle size is 0.4 mm to 0.6 mm and 90%
These are in the particle size range of 0.2 mm to 0.9 mm. The thickness of the second granular material layer 6 is about several mm, and a clear line can be obtained by setting the thickness so that the tip of the lawn leaf 4 is hidden.

A turf leaf 4 made of polypropylene having a length of 25 mm.
Inside, a granular material-filled layer 5 made of natural silica sand having a particle size range of 0.2 mm to 2.0 mm is formed with a thickness of 20 mm (a sports field six months after completion of construction), and the particle size The second granular material layer 6 of calcium bicarbonate particles having a distribution has a width of 5 mm.
An experiment was performed by drawing a line at a thickness of 0 mm so as to cover the lawn leaf 4 almost. As a result, the boundary portion of the line was clear even after one day of use, and the line was sufficiently distinguishable. Also, 1
Even when left unattended for more than a week, the line could be easily identified by withstanding the weather. Then, when this line was sucked by a commercially available sweeper, it could be easily erased. Further, even after two months or more, it was not easy to identify the line, and it was not possible to find any problems such as entering into the lower granular material-filled layer and solidifying it.

As a comparative example, in a completely similar artificial turf playground containing sand, calcium bicarbonate powder having a particle size range of 0.1 mm to 0.2 mm was used, and the same thickness and 50 mm were used.
As a result of conducting an experiment by drawing a line having a width, the boundary line became unclear after one day of use, and it was difficult to determine the boundary line.
In addition, after leaving for one week, there were many places that became invisible due to the weather and where it was extremely difficult to determine. Then, after the line was laid, the powder was suctioned with a commercially available sweeper. As a result, powder remained in the packed bed of granular materials. In order to completely remove the powder, it was necessary to absorb a considerable amount of sand in the packed bed below.

In addition, as the material of the second granular material in the present invention, light calcium carbonate, colored sand, ceramic particles, glass particles and the like can be used in addition to the above-mentioned calcium bicarbonate particles. However, it is more preferable to use a material color because it can prevent color fading over time. Above all, calcium carbonate is easily available, economical and suitable for white.

Further, the structure of the artificial turf main body and the granular material used for the filling layer as the base layer are not particularly limited to the above-mentioned embodiment, and it goes without saying that any structure or material can be used.

[0020]

As described above, according to the present invention, on the granular material-filled layer of the artificial turf containing the granular material, the grain size is slightly smaller than that of the granular material of the packed layer for the line mark. Since the second granular material in which 90% of the particles fall within the range of 2 mm to 0.9 mm is laminated, the second granular material suppresses the movement of the granular material of the lower filling layer and reduces the time of play. The line was hard to be scattered even by stepping on the, and the line could be sufficiently discriminated without the pattern being destroyed by use or wind and rain. In addition, even when the powder is used for a long period of time, there is no problem that the solidification phenomenon is promoted by penetrating into the granular material packed layer as in the case of using the conventional powder. Furthermore, by using a commercially available sweeper, lines can be erased much more easily than when using conventional powders. Lines remain clearly when necessary, and easily erased when unnecessary. It has been confirmed that the function of the line in this kind of athletic field can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a structure of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Under pad 3 ... Base cloth 4 ... Turf leaf 5 ... Granular material filling layer 6 ... Second granular material layer

Claims (1)

(57) [Scope of request for utility model registration] In an athletic stadium in which artificial grass is laid on a base and a granular material is filled in the grass of the artificial grass, the granular material is added to a part of a surface layer of the granular material-filled layer. Are laminated with a second granular material having a different color, and the second granular material has a particle size range of 90% or more of 0.2% or more.
An artificial turf containing a granular material, wherein the turf is in a range of not less than 0.9 mm and not more than 0.9 mm.