JPS5948505A - 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 This invention provides baseball fields, soccer fields, competition tracks, tennis courts, and
This relates to athletic fields such as volleyball courts.

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. Artificial lawns have become rapidly popular in recent years because they are more durable and easier to maintain than natural lawns. In many cases, dry sand is filled into the turf grains of the artificial lawn in order to more closely approximate the characteristics of a natural lawn.

However, this method has the drawback that the sand filled in the lawn appears whitish and stands out on the surface, detracting from the beautiful appearance.

This invention was made in view of the above-mentioned drawbacks, and its purpose is to take advantage of the favorable characteristics of filling with dry sand, to create a beautiful appearance, and to create a playing surface in various color patterns as needed. The purpose of the above is to provide an athletic field made of artificial grass that can be finished. This is accomplished by layering colored sand that is artificially colored, such as yellow.

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

This athletic field includes a ground 1 whose upper surface is finished substantially flat, an artificial lawn 2 laid on this ground 1, and a sand layer 3 filled in the grass grains of this artificial lawn 2. There is. In this embodiment, the ground 1 consists of stabilized crushed stone and/or sand, for example. 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 leveled until the top surface is substantially flat. Formed by rolling. However, unlike the illustrated example, the ground 1 is made of dense-grained or fine-grained asphalt/concrete with a non-permeable structure, or permeable asphalt/concrete.
It may also be formed from concrete. The artificial lawn 2 includes a backing base fabric 4 and pile threads 5 planted on this base fabric 4.
It consists of

In this case, the base fabric 4 is made of crushed stone and/or sand that has been treated to stabilize the ground 1, and is made of non-permeable material to prevent the stability from being weakened and weakened by rainwater penetration. being sexually abused.

This water impermeability can be obtained, for example, by packing the base fabric 4 with rubber or urethane resin. Note that when the ground 1 is made of water-permeable asphalt concrete, the base fabric 4 may be water-permeable, and more preferably, the base fabric 4 is made of water-permeable asphalt concrete.
It is preferable to interpose a cushion layer made of rubber chips or the like between the base 1 and the base 1. The pile yarn 5 can be made from various synthetic resins, but in terms of appearance and texture, it is more similar to natural grass, and considering durability, it is made of polyamide, polyethylene terephthalate, polyvinylidene chloride, polypropylene, or acrylic resin. Resins are preferred, and are made of slit yarns obtained by cutting films of these resins, or flat yarns formed by melt spinning through a nozzle having irregular cross-sectional holes. Considering that this artificial turf 2 is used in place of conventional natural turf in tennis courts, soccer fields, baseball fields, etc.
The pile length is generally 10mm to 40mm.
It is preferable that In this invention,
The sand layer 3 has a two-layer structure of dry sand 6 layered on a base fabric 4 and colored sand 7 layered thereon. In this case, dry sand is defined as river sand, sea sand, silica sand, etc. that has been heated and dehydrated. In addition, this dry sand 6 is the artificial lawn 2.
By spraying it on top of the grass, it is filled into the grass grain, but if the particle size is finer than 100 mesh, it tends to be gradually compacted by the foot pressure of the competitors, and when it is applied, it is likely to be scattered as dust. The risk of climbing, especially in indoor facilities, is unfavorable from the standpoint of occupational safety and health as well as environmental health.

In view of this, the dry sand 6 has a particle size of 100 mesh to 28 mesh (approximately 0.15 mm to approximately 0.6 m).
It is preferable that the sand contained in m) is 80% or more. According to this, when the wind friction speed is about 15 cm per second (corresponding to the wind speed of about 4 m per second at 1 m above the ground), combined with the anti-sand effect of the pile threads 5, almost no dust is blown away, and therefore, especially during construction, dust is not blown away. Very few minutes occur. Furthermore, in view of the relationship with the particle size, satisfactory results can be obtained in terms of both water retention capacity and drainage performance. The colored sand 7 is
It is preferably made of river sand or the like that has been dried in the same way as the dry sand 6, but the particle surface is artificially colored.

The color will generally be the same green as the pile yarn 5, but if the playing surface is to be partially different colors, for example, the goal area of a hockey or soccer field, or the inside and outside of a tennis court. When color-coding the outside, it is best to color it yellow or brownish. The paint to be used is preferably an oil-based paint, but a water-soluble paint may also be used, and in some cases, the paint may be colored by simply sprinkling powdered dye.

The colored sand 7 is preferably coarser than the dry sand 6 in order to always remain on the surface layer of the dry sand 6 even after an intense competition and to prevent it from being blown away by wind or the like.

More specifically, sand with a particle size of 70 mesh to 14 mesh (approximately 0.21 mm to approximately 1.2 mm) is
It is good if it contains 0% or more. On the other hand, the thickness of the sand layer 3 containing the dry sand 6 and colored sand 7 is suitably about 70% to 110% of the length of the pile yarn 5. 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 stabilizes after about a month. The layer thickness is selected in relation to, for example, the bounce characteristics of the ball. That is, if a large amount of sand is added to the extent that the pile yarns 5 are covered, the pile yarns 5 stand upright and become rigid, which increases the bounce of the ball and improves durability. In this case, in the case of conventional lawns, the green color of the artificial lawn 2 becomes less noticeable and the aesthetic appearance is impaired, but by using the green colored sand 7 as described above, it is possible to finish the playing surface neatly in a solid green color. can.

On the other hand, if the amount of sand is reduced so that the tips of the pile yarns 5 protrude from the upper surface of the sand layer 3, the playing surface becomes flexible and the bouncing of the pole is lowered, but on the other hand, the pile yarns 5
wear will be accelerated. Incidentally, the layer thickness ratio between the dry sand 6 and the colored sand 7 is appropriately determined by taking into consideration water retention properties and the like.

As is clear from the description of the embodiments described above, according to the present invention, dry sand 6 that has been dried is filled in the grass grains of the artificial lawn, that is, between the pile yarns 5, and furthermore, for example, the pile yarns 5 Since the colored sand 7 colored in the same green color is layered, it is possible to provide a playing surface that looks beautiful as a whole. Furthermore, by preparing colored sand colored in yellow or brownish colors, for example, the goal area of a soccer field or the like can be easily changed to a color different from the green of the artificial lawn 2, It is extremely convenient for construction.

[Brief explanation of drawings]

The figure is a partial sectional view 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 sand layer, 4 is the base fabric,
5 is pile yarn, 6 is dry sand, and 7 is colored sand. Patent Applicant Sumitomo Rubber Industries Co., Ltd. Representative Patent Attorney Takuya Ohara
Spontaneous) 1981 1 (RI81E 4, Mr. Kazuo Wakasugi, Director-General of Licensing Agency) 11e1 Indication 1981 Patent Application No. 157535 2 Title of Invention Artificial Grass Athletic Stadium 3 Compensator Small (' Relationship with I Patent applicant 4, agent 102 Address 2 Narita Hill 5, 3-6-5 Kojimachi, Chiyoda-ku, Tokyo Date of amendment order (voluntary) Fill in the scope of claims as attached. Correct. Attachment 11, .2.'l\t'1 Claims (11-, 1-face or 1-sided stone formed flat / 2 ground I, 21 people laying grass cows) 1) In the 1:1 log of the people's lawn, 1: 1: 1: 1: 1: 1 z of chrysanthemum. In addition to filling the sand, an artificial grass sports field was constructed by applying one layer of artificially colored sand to each dry surface. (2) The above-mentioned Dry sand is 1 grain size or 10 ()metsun-I-f;
(1) 80% or more of the sand within the range of 28 meters -1
Claim 1, characterized in that the colored sand C4, W'II contains at least 8 () parts of sand within a range of 8 to 1.1 parts. C
g) Artificial grass sports stadium. (:() The artificial lawn consists of a base fabric installed on the ground -1-, and a romf, c planted on the base fabric.
An athletic field made of artificial grass according to claim 1, characterized in that it has pile threads for adjusting the length of the fences. (4) The layer thickness including the dry sand and colored sand is 70% of the pile length at the time of construction7. ((+”17110%
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Claims (4)

[Claims] (1) In an artificial grass sports stadium where an artificial grass is laid on a ground with a substantially flat upper surface, dried sand such as dried river sand is placed within the grain of the artificial grass. An athletic field made of artificial grass, characterized in that it is filled with dry sand, and artificially colored sand is layered on top of the dry sand. (2) The dry sand has a viscosity of 100 mesh to 28 mesh.
Claim 1, characterized in that the colored sand contains 80% or more of sand within the range of mesh, and the colored sand contains 80% or more of sand whose particle size is within the range of 70 mesh to 14 mesh. Artificial grass athletic field as described. (3) The artificial lawn comprises a base fabric installed on the ground, and pile threads having a length of 10 mm to 40 mm planted on the base fabric. An athletic field made of artificial grass as described in paragraph 1. (4) The thickness of the layer containing the dry sand and colored sand is between 70% and 110% of the pile length at the time of construction, and the artificial lawn athletic field according to claim 3. Place.