Nothing Special   »   [go: up one dir, main page]

JPS6263701A - Artificial turf athletic field - Google Patents

Artificial turf athletic field

Info

Publication number
JPS6263701A
JPS6263701A JP21612486A JP21612486A JPS6263701A JP S6263701 A JPS6263701 A JP S6263701A JP 21612486 A JP21612486 A JP 21612486A JP 21612486 A JP21612486 A JP 21612486A JP S6263701 A JPS6263701 A JP S6263701A
Authority
JP
Japan
Prior art keywords
artificial grass
artificial
artificial turf
granules
sports stadium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP21612486A
Other languages
Japanese (ja)
Other versions
JPS6339725B2 (en
Inventor
平林 克敏
古川 源蔵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Nisshoku Corp
Original Assignee
Sumitomo Rubber Industries Ltd
Nisshoku Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd, Nisshoku Corp filed Critical Sumitomo Rubber Industries Ltd
Priority to JP21612486A priority Critical patent/JPS6263701A/en
Publication of JPS6263701A publication Critical patent/JPS6263701A/en
Publication of JPS6339725B2 publication Critical patent/JPS6339725B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Road Paving Structures (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、人工芝生を表面に敷設して構成されたテニス
コート、野球場、サッカー場又はゴルフ場のグリーン、
ティーグランドもしくは歩行路などの運動競技場の表層
構造の改良に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to greens for tennis courts, baseball fields, soccer fields, or golf courses that are constructed by laying artificial grass on the surface;
Concerning the improvement of the surface structure of sports stadiums such as teeing grounds or walking paths.

〔従来の技術〕[Conventional technology]

近年、在来の土質運動競技場が雨水などでぬかるみ運動
動作を著しく阻害したり、また運動動作で地表面が著し
く荒らされるため、その保守管理に一方ならぬ手間を要
すると云う欠点を有する点に鑑み、例えばポリアミド等
の合成樹脂から作られたパイル糸を基布に植毛して成る
人工芝生を地表上に敷設した運動競技場、殊に野球場が
欧米は素より国内でも多用されている。
In recent years, conventional soil athletic fields have had the disadvantage that rainwater, etc., significantly impede athletic activities, and the ground surface is significantly disturbed by athletic activities, so maintenance and management thereof requires a considerable amount of effort. In view of this, for example, athletic stadiums, especially baseball fields, are often used not only in Europe and America but also in Japan, where artificial turf is laid on the ground by pile fibers made of synthetic resin such as polyamide and flocked to the base fabric. .

しかるに、最近に至って上記運動競技場、殊に野球場や
サッカー競技場等において、人工芝生が天然芝に比べて
選手の疲労度を高め、しかも人工芝を採用している球場
における故障者の続出が報じられている。勿論、その因
果関係についての医学的解明は未だなされていないが、
その原因は、捕球や走塁のため人工芝生上を駆は回る選
手のスパイクが、強靭な裏打基布上に無数のパイル糸を
植設されている人工芝生の芝目内に突き刺さって穎いた
り、捕球ないし送球のために急速に踏み止まろうとした
時、靴底を介して瞬間的に加えられる強大な荷mを人工
芝生が吸収しえないため、その反力として強大な荷重が
選手の足首部、膝関節、大腿部などに負荷されることに
よるものと推測される。
However, recently, artificial turf at athletic fields, especially baseball stadiums, soccer stadiums, etc., has increased the fatigue level of players compared to natural turf, and moreover, there has been a steady increase in injuries at stadiums that use artificial turf. is reported. Of course, the cause and effect relationship has not yet been medically elucidated, but
The cause of this is that the spikes of players running across the artificial turf to catch a ball or run the bases pierce the grain of the artificial turf, which has countless pile threads planted on the strong backing fabric. When a player tries to stop quickly to catch or throw a ball, the artificial turf cannot absorb the huge load that is instantaneously applied through the sole of the shoe. It is assumed that this is due to the load placed on the ankles, knee joints, thighs, etc.

そこで、このような問題点に有効な解決を与えるため、
本出願人らは、実公昭51−33472号(登録第11
74148号)の考案により、人工芝生の芝目内に土壌
その他、合成樹脂粒子、オガクズ等の木材粉末、あるい
はアンツーカ−に使用する混和上などの比較的硬質の粒
状物を1種または2種以上混合した被覆材を充填した運
動競技場(以下、“砂入り人工芝生製運動競技場”と仮
称)を開発した。この構成によれば、人工芝生内に充填
された前記土壌等の硬質粒状物がスパイク先端の引掛り
を防止するほか、恰もバンカーにゴルフボールが打ち込
まれた’J’5合のごとく、該粒状物の流動及び相互摩
擦作用とにより、選手の靴底により加えられる荷重を吸
収して人体−・の負荷を軽減する。
Therefore, in order to provide an effective solution to these problems,
Applicants have filed the application under Utility Model Publication No. 51-33472 (Registration No. 11).
No. 74148), one or more types of relatively hard granular materials such as soil, synthetic resin particles, wood powder such as sawdust, or mixtures used in Anzuka are added to the turf grains of artificial lawns. We have developed an athletic field (hereinafter tentatively named "artificial grass athletic field with sand") filled with a mixed covering material. According to this configuration, the hard granules such as the soil filled in the artificial lawn prevent the tips of the spikes from getting caught, and the granules also Through the flow of objects and mutual friction, the load applied by the soles of the players' shoes is absorbed, reducing the load on the human body.

加えて、該土壌等が芝表面及び競技場表面の雨水を急速
に吸収するので、芝生の水濡れに伴うスベリ易さを軽減
し、競技場表面に水濡れを生じさせない等の利点を有す
る。
In addition, since the soil rapidly absorbs rainwater on the grass and stadium surfaces, it has the advantage of reducing the tendency of the grass to slip when wet, and preventing the stadium surface from getting wet.

〔解決しようとする問題点〕[Problem to be solved]

しかし、その後、本出願人らが多数の上述砂入り人工芝
生製運動競技場を施工してきた実績の中で経験したとこ
ろによれば、人工芝生内に充填されている土壌等の前記
被覆材は、時を経るとともに繰り返し生じる雨水等によ
る湿潤状態や競技者による踏み付けなどにより漸次締め
固められてしまい、その−特性である砂(土壌)等の流
動性が喪失し、その結果、該流動作用とそれに伴う相互
摩擦作用とによる良好な衝撃吸収性能を発揮しえなくな
る場合もあることが判った。
However, according to the applicant's experience in constructing a large number of athletic fields made of sand-containing artificial turf, it has been found that the covering material such as soil filled in the artificial turf is As time passes, sand (soil), etc., becomes gradually compacted due to repeated wet conditions such as rainwater and trampling by athletes, and as a result, the fluidity of sand (soil), etc., which is its characteristic, is lost. It has been found that there are cases where it becomes impossible to exhibit good shock absorption performance due to mutual frictional effects associated with this.

そこで、本発明は上述の問題点に解決を与え、芝目内に
充填される粒状物がいつ迄も締め固められることなく優
れた衝撃吸収作用を奏しうると共に、快適に競技を行い
うる人工芝生製運動競技場を提供することを目的とする
Therefore, the present invention provides a solution to the above-mentioned problems, and provides an artificial lawn in which the granules filled in the turf grains are not compacted forever, exhibiting an excellent shock absorbing effect, and which allows for comfortable competitions. The purpose is to provide a manufactured athletic field.

〔問題点を解決するための手段〕[Means for solving problems]

本発明に係る人工芝生製運動競技場は、上記問題点を解
決するため、実質的に平坦に形成された基盤上に、基布
に合成繊維製パイル糸などを立設して構成された人工芝
生を敷設して成る人工芝生製運動競技場において、従来
の砂入り人工芝生製運動競技場のごとく、その芝目内に
土壌などの比較的硬質の粒状物を充填する代わりに、ソ
リッド状(中実)又はフオーム状の加硫ゴムを破砕して
得られたゴムチップ又はコルク粒やヤシ殻破砕物などの
植物性粒状物より成る微小の弾性粒状物の1種又は2種
以上を充填したことを特徴とする。
In order to solve the above-mentioned problems, the artificial grass athletic field according to the present invention is an artificial grass field that is constructed by erecting pile threads made of synthetic fibers on a base fabric on a substantially flat base. In an artificial turf sports stadium where grass is laid, instead of filling the turf with relatively hard granular materials such as soil, as in conventional sand-containing artificial turf sports fields, a solid-like ( Filled with one or more types of minute elastic granules made of rubber chips obtained by crushing vulcanized rubber (solid) or foam, or vegetable granules such as cork grains and crushed coconut shells. It is characterized by

本発明の人工芝生製運動競技場に使用される人工芝生と
しては、従来のものと同様、ポリプロピレン、ポリアミ
ド、ポリウレタン、ポリ塩化ビニリデンなどの合成樹脂
を用いて鋳型成形法により基板上に無数の細長帯片を一
体的に立設形成した構造のもののほか、前記合成樹脂等
のフィルムを細切りしたスリットヤーンをパイル糸とす
るか、又は溶融紡糸により異形断面孔を有するノズルを
通して扁平糸を作り、これをパイル糸として基布に植設
した構造のものが用いられる。
The artificial turf used in the artificial turf sports stadium of the present invention is made of synthetic resin such as polypropylene, polyamide, polyurethane, polyvinylidene chloride, etc., and is made of numerous thin strips on a substrate by a molding method, similar to conventional ones. In addition to the structure in which strips are integrally formed upright, pile yarn is made from slit yarn obtained by slicing the film of the synthetic resin, etc., or flat yarn is made by melt spinning through a nozzle having irregular cross-sectional holes. A structure in which pile yarn is embedded in the base fabric is used.

先述の微小弾性粒状物は、それ自体の厚みを約8m++
+ないし約1811Illl+とし、か・つ上記芝生の
葉先が約2m1I!ないし約8ms+の長さで該粒状物
の層の表面に突出するように散布、充填される。ただし
、前記充填厚みは、テニスコートを対象とした場合の目
安であって、競技場の種類(例えば、野球場やザラカー
競技場)又はパイル糸の種類や目付量などに応じて適宜
増減される。また、該充填厚みは芝目内に充填された該
粒状物が充分安定した状態でのものである。
The aforementioned microelastic particles have a thickness of approximately 8m++.
+ or about 1811Ill+, and the tip of the above lawn's leaves is about 2m1I! The granules are scattered and filled in such a way that they protrude from the surface of the layer for a length of about 8 ms+. However, the above-mentioned filling thickness is a guideline when the target is a tennis court, and may be increased or decreased as appropriate depending on the type of stadium (e.g., baseball field or Zarakar stadium), the type of pile yarn, the area weight, etc. . Further, the filling thickness is such that the granules filled in the grass grain are sufficiently stable.

〔作  用〕[For production]

本発明の人工芝生製運動競技場では1、従来の砂入り人
工芝生製運動競技場における土壌などの硬質粒状物の場
合と異なり、芝目内に充填されている微小の弾性粒状物
の各粒子が競技者の踏付は荷重により伸縮することに因
り、該粒状物が経時的に締め固められるのを防止する。
In the artificial turf sports stadium of the present invention, 1. Unlike the case of hard granules such as soil in conventional sand-containing artificial turf sports stadiums, each particle of minute elastic granules is filled in the turf grains. However, the stepping of the athlete prevents the granules from becoming compacted over time as they expand and contract under load.

また、先述の通り、粒状物は人工芝生の殆ど表面近くま
で充填される関係上、若し、該充填物が従来のように土
壌などの比較的硬質の材料である場合、転倒した競技者
が擦過傷を蒙むる場合もあるが、本発明の運動競技場で
は弾性粒状物により構成されているから、そのような傷
害を蒙むることも皆無である。
Furthermore, as mentioned above, because the particulate matter is filled almost to the surface of the artificial turf, if the filling material is a relatively hard material such as soil as in the past, the player who falls may Although the sports stadium of the present invention is made of elastic granules, such injuries will not occur at all.

以」二に加えて、弾性粒状物の種類を先述したもの中か
ら適切に選択して混用したり、その粒径を適当に選択す
ることにより、運動競技の種別に応じて優れたクッショ
ン作用を発揮させることができる。勿論、本発明の運動
競技場においても、前記弾性粒状物の流動作用及びそれ
に伴う相互摩擦作用とにより優れた衝撃吸収作用を奏し
うろことは云うまでもない。
In addition to the above, by appropriately selecting and mixing the types of elastic granules from those mentioned above, and by appropriately selecting the particle size, it is possible to achieve an excellent cushioning effect depending on the type of athletic event. It can be demonstrated. Of course, it goes without saying that even in the athletic stadium of the present invention, an excellent impact absorption effect can be achieved due to the flow effect of the elastic granules and the accompanying mutual friction effect.

なお、上記弾性粒状物の粒径は、充填作業効率の面から
従来使用されている砂の粒径と同等か、もしくはそれよ
り若干小さいほうが好ましい。
Note that the particle size of the elastic granules is preferably equal to or slightly smaller than the particle size of conventionally used sand from the viewpoint of filling efficiency.

〔実 施 例〕〔Example〕

以下、本発明の実施例について説明する。 Examples of the present invention will be described below.

第1図は、本発明を通用したテニスコートの拡大部分断
面図である。同図を参照して、本例テニスコートでは、
地面を堀り下げて形成した路床(4)上に、順次に粒調
砕石層(5)及び密粒アスファルト・コンクリート層(
6)を積層して基盤(3)が構築された。
FIG. 1 is an enlarged partial cross-sectional view of a tennis court to which the present invention is applied. Referring to the figure, in this example tennis court,
On the roadbed (4) formed by digging down the ground, a layer of fine-grained crushed stone (5) and a layer of dense-grained asphalt concrete (
A base (3) was constructed by laminating 6).

次いで、基盤(3)上に平均背丈26cmのポリプロピ
レン製人工芝生(1)が敷設された後、該芝生(1)の
芝目内に、粒径が約28〜200メツシユの範囲内のも
のを90%以上含むゴムチップ(2)が、平均18+g
m厚みで散布、充填された。なお、基盤(3)及び人工
芝生(1)の周側部には舗装止めブロック(7)が構築
され、さらに該ブロック(7)の外側の地中には前記粒
調砕石層(5)の轡と通じる排水溝(8)が構築されて
いる。
Next, after a polypropylene artificial lawn (1) with an average height of 26 cm is laid on the base (3), particles with a particle size in the range of about 28 to 200 mesh are placed in the grain of the lawn (1). Rubber chips (2) containing 90% or more have an average weight of 18+g
It was spread and filled to a thickness of m. In addition, a paving stopper block (7) is constructed around the base (3) and the artificial lawn (1), and the granular crushed stone layer (5) is further placed in the ground outside the block (7). A drainage ditch (8) has been constructed that communicates with the culvert.

以上構成の本例コートにおける早期排水性能及びゴムチ
ップ層(2)の締め固まり防止効果を確認するため、該
コート上に大量の水を連続的に撒水して人工芝生(1)
を完全に冠水させた後、放水を停止させる実験を繰り返
し行ったところ、各回とも、水は約20分後には人工芝
生(1)の層から退き、プレー可能な状態となり、また
、前記ゴムチップ層f2)のレベル低下は全く認められ
なかった。
In order to confirm the early drainage performance and compaction prevention effect of the rubber chip layer (2) in this example court with the above structure, a large amount of water was continuously sprinkled on the court to create an artificial lawn (1).
After repeatedly submerging the artificial turf (1) with water, we repeatedly conducted an experiment in which water was stopped, and in each case, the water receded from the artificial turf (1) layer after about 20 minutes, making it playable. No decrease in the level of f2) was observed.

一方、本例コートにおいて試験的にプレーした10名の
競技者について、ボールの速度やパウンド、靴底のスベ
リ具合、クッション感覚、疲労感等の使用感に関してア
ンケート調査を行ったところ、「ボール速度」及び「ボ
ールバウンド」に関して“若干難点あり”と答えた者が
2名、「クッション感覚」に関して“柔らか過ぎる”と
答えた者が1名あった程度で、総じて、その使用感は従
来の“砂入り人工芝生製運動競技場”に劣らず良好との
回答を得た。
On the other hand, when we conducted a questionnaire survey on the 10 players who played on this example court on a trial basis regarding their feelings of use, such as the speed and pound of the ball, the slippage of the sole, the feeling of cushioning, and the feeling of fatigue, we found that '' and ``Ball Bounce'' were answered by 2 people who answered ``some difficulties,'' and 1 person answered that ``Cushion Feeling'' was ``too soft.'' Overall, the feeling of use was as good as the conventional one. We received responses that it was as good as the "Sports Stadium Made of Artificial Grass Filled with Sand."

〔発明の効果〕〔Effect of the invention〕

本発明は、以上説明した通り、実質的に平坦に形成され
た基盤上に、基布に合成繊維製パイル糸などを立設して
構成された人工芝生を敷設して成る人工芝生製運動競技
場において、従来の砂入り人工芝生製運動競技場のごと
く、その芝目内に土壌などの比較的硬質の粒状物を充填
する代わりに、ソリッド状(中実)又はフオーム状の加
硫ゴムを破砕して得られたゴムチップ又はコルク粒やヤ
シ殻破砕物などの植物性粒状物より成る微小の弾性粒状
物の1種又は2種以上を充填することにより、芝目内に
充填される粒状物が雨水の浸透や競技者の踏み圧により
経時的に締め固められることな(、いつ迄も優れた衝撃
吸収作用を奏しうると共に、快適に競技を行いうる人工
芝生製運動競技場を提供することができる。
As explained above, the present invention provides an artificial lawn athletic event in which an artificial lawn constructed by erecting synthetic fiber pile threads on a base fabric is laid on a substantially flat base. Instead of filling the turf with relatively hard granular materials such as soil, as in conventional sand-containing artificial turf athletic fields, solid or foam vulcanized rubber is used. A granular material that is filled into grass grains by filling one or more types of minute elastic granules made of rubber chips obtained by crushing or vegetable granules such as cork grains and crushed coconut shells. To provide an athletic field made of artificial turf that is not compacted over time by the penetration of rainwater or the tread pressure of athletes, and which can exhibit an excellent shock absorbing effect over time and allows comfortable competitions. Can be done.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は、本発明を通用したテニスコートの拡大部分断
面図である。 図中の参照符号の意味は以下の通り; 1:人工芝生、2:弾性粒状物(ゴムチップ)、3:基
 盤、 4:路 床、 5:粒調砕石層、 6:密粒アスファルト・コンクリート層、7:舗装止め
ブロック、8:排水溝。
FIG. 1 is an enlarged partial cross-sectional view of a tennis court to which the present invention is applied. The meanings of the reference symbols in the diagram are as follows; 1: Artificial lawn, 2: Elastic granules (rubber chips), 3: Foundation, 4: Roadbed, 5: Granulated crushed stone layer, 6: Dense-grained asphalt concrete. Layer, 7: Paving block, 8: Drainage ditch.

Claims (4)

【特許請求の範囲】[Claims] (1)実質的に平坦に形成された基盤上に、基布に合成
繊維製パイル糸などを立設して構成された人工芝生を敷
設して成る人工芝生製運動競技場において、前記芝生内
に微小の弾性粒状物のみを充填したことを特徴とする人
工芝生製運動競技場。
(1) In an artificial grass sports stadium where an artificial grass consisting of synthetic fiber pile yarn or the like is erected on the base fabric on a substantially flat base, the area within the grass is An athletic field made of artificial grass characterized by being filled with only minute elastic particles.
(2)微小の弾性粒状物が、ソリッド状又はフォーム状
の加硫ゴムを破砕して得られたゴムチップである特許請
求の範囲第1項記載の人工芝生製運動競技場。
(2) The artificial grass sports stadium according to claim 1, wherein the minute elastic particles are rubber chips obtained by crushing solid or foam vulcanized rubber.
(3)微小の弾性粒状物が、コルク粒やヤシ殻破砕物な
どの植物性粒状物である特許請求の範囲第1項記載の人
工芝生製運動競技場。
(3) The artificial grass sports stadium according to claim 1, wherein the minute elastic granules are vegetable granules such as cork grains and crushed coconut shells.
(4)微小の弾性粒状物が、ゴムチップ及び植物性粒状
物を混合したものである特許請求の範囲第1項記載の人
工芝生製運動競技場。
(4) The artificial grass sports stadium according to claim 1, wherein the fine elastic particles are a mixture of rubber chips and plant particles.
JP21612486A 1986-09-13 1986-09-13 Artificial turf athletic field Granted JPS6263701A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21612486A JPS6263701A (en) 1986-09-13 1986-09-13 Artificial turf athletic field

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21612486A JPS6263701A (en) 1986-09-13 1986-09-13 Artificial turf athletic field

Publications (2)

Publication Number Publication Date
JPS6263701A true JPS6263701A (en) 1987-03-20
JPS6339725B2 JPS6339725B2 (en) 1988-08-08

Family

ID=16683632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21612486A Granted JPS6263701A (en) 1986-09-13 1986-09-13 Artificial turf athletic field

Country Status (1)

Country Link
JP (1) JPS6263701A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010523855A (en) * 2007-04-12 2010-07-15 ヌスカ、ロベルト Method for producing artificial lawn, method for obtaining artificial lawn
JP2017166151A (en) * 2016-03-14 2017-09-21 長谷川体育施設株式会社 Composite ground of artificial and natural lawn, and construction method thereof
JP2017198043A (en) * 2016-04-28 2017-11-02 積水樹脂株式会社 Drainage structure for artificial turf member established plane

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133472U (en) * 1974-09-02 1976-03-11
JPS5262936A (en) * 1975-11-18 1977-05-24 Haas Frederick T Jun Truck and field surface for sporting events

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133472U (en) * 1974-09-02 1976-03-11
JPS5262936A (en) * 1975-11-18 1977-05-24 Haas Frederick T Jun Truck and field surface for sporting events

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010523855A (en) * 2007-04-12 2010-07-15 ヌスカ、ロベルト Method for producing artificial lawn, method for obtaining artificial lawn
JP2017166151A (en) * 2016-03-14 2017-09-21 長谷川体育施設株式会社 Composite ground of artificial and natural lawn, and construction method thereof
JP2017198043A (en) * 2016-04-28 2017-11-02 積水樹脂株式会社 Drainage structure for artificial turf member established plane

Also Published As

Publication number Publication date
JPS6339725B2 (en) 1988-08-08

Similar Documents

Publication Publication Date Title
US4389435A (en) Top dressed plating surface with resilient underpad
US3995079A (en) Artificial turf-like product
KR100557282B1 (en) Synthetic grass with resilient granular top surface layer
US4337283A (en) Synthetic turf playing surface with resilient top-dressing
US4044179A (en) Playing surface for athletic games
US4564310A (en) Resilient paving composition for playfields sports fields and recreation areas
US6800339B2 (en) Filled synthetic turf with ballast layer
KR20010079878A (en) Process of lying synthetic grass
US6071039A (en) Structure of surface portions of grounds
JP3253204B2 (en) Athletic stadium made of artificial grass
JPS587005A (en) Construction of artificial turf athletic field
CA1122236A (en) Top dressed playing surface with resilient underpad
JPS6263701A (en) Artificial turf athletic field
JP4022441B2 (en) Artificial grass sports field
JP2660799B2 (en) Athletic stadium made of artificial grass
JPS646862Y2 (en)
JPS646863Y2 (en)
KR102170750B1 (en) The all-weather hard court
JPH03125704A (en) Artificial lawn surfaced ground
JPH0259243B2 (en)
JP2549048B2 (en) Artificial grass athletic field
JPH0369705A (en) Ground made of artificial lawn
JPH0342082Y2 (en)
JPS62197079A (en) Sand containing athletic field made of artificial turf
JPH0222164B2 (en)