JPS6238481B2 - - Google Patents
Info
- Publication number
- JPS6238481B2 JPS6238481B2 JP13664582A JP13664582A JPS6238481B2 JP S6238481 B2 JPS6238481 B2 JP S6238481B2 JP 13664582 A JP13664582 A JP 13664582A JP 13664582 A JP13664582 A JP 13664582A JP S6238481 B2 JPS6238481 B2 JP S6238481B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- electrolyte polymer
- soil
- stadium
- constructing
- 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.)
- Expired
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- 239000002689 soil Substances 0.000 claims description 47
- 229920000642 polymer Polymers 0.000 claims description 24
- 239000003792 electrolyte Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 17
- 125000000129 anionic group Chemical group 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 125000002091 cationic group Chemical group 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 2
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 238000004898 kneading Methods 0.000 claims 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 18
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 18
- 239000010410 layer Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000006266 etherification reaction Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000000386 athletic effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 210000002414 leg Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000009490 roller compaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000013053 water resistant agent Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Landscapes
- Road Paving Structures (AREA)
Description
【発明の詳細な説明】
この発明は運動場、陸上競技場、テニスコート
などの屋内、屋外の各種競技場、更には遊歩道な
どのグランド面の造成方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing ground surfaces for various indoor and outdoor sports fields such as athletic fields, track and field fields, and tennis courts, as well as for promenades.
クレーなどの天然土や、アンツーカ、縁泥石粉
などの天然系人工土を用いて造成したグランド
は、合成樹脂製のグランドよりも自然な感触と弾
性とが得られ、体育力学的な面からは好ましいの
であるが、反面、全天候性ではないので、グラン
ドの維持管理に手間がかかる欠点がある。そこ
で、これらの天然土や天然系人工土のグランドを
改質する為、土に水溶性高分子物質を添加する方
法は既に本発明者によつて提案（特願昭57―
7917）された。この方法によれば、グランドの透
排水性が良くなつて、雨後もただちに使用可能
で、冬期の霜柱の発生や、乾燥時の砂塵の舞い上
りなどが少なく、グランドの維持管理が楽になる
効果を有するが、添加した高分子物質が水溶性で
ある為、少量の降雨では問題はないが、大雨に合
うと土中の高分子物質が流出してしまい、所期の
効果が消失してしまう欠点がある。 Grounds constructed using natural soils such as clay or natural artificial soils such as Antuca and curb mud stone powder have a more natural feel and elasticity than synthetic resin grounds, and are better from a physical education mechanical perspective. Although this is preferable, on the other hand, it is not weatherproof, so it has the disadvantage that it takes time and effort to maintain the grounds. Therefore, in order to improve the ground quality of these natural soils and natural artificial soils, the present inventor has already proposed a method of adding water-soluble polymeric substances to the soil (Japanese Patent Application No. 1983-
7917) was done. This method improves the permeability of the ground, allows it to be used immediately after rain, reduces the occurrence of frost pillars in the winter, and reduces the flying up of dust during dry periods, making maintenance and management of the ground easier. However, since the added polymeric substance is water-soluble, there is no problem with a small amount of rainfall, but if it rains heavily, the polymeric substance in the soil will wash out and the desired effect will disappear. There is.
本発明はこのような点に鑑み、大雨などによつ
てもグランドの性能が悪化することのない造成方
法を提供せんとするもので、その特徴とするとこ
ろは、天然土や天然系人工士の表層土主材にアニ
オン性電解質ポリマーを添加すると共に、カチオ
ン性電解質ポリマーを加えてグランド表面を形成
することにある。 In view of these points, the present invention aims to provide a construction method that does not deteriorate the performance of the ground even in heavy rain. The purpose is to form a ground surface by adding an anionic electrolyte polymer to the main material of the surface soil and a cationic electrolyte polymer.
本発明で使用する表層土主材としては、クレー
などの天然土、アンツーカや縁泥石粉などの天然
系人工土、或いは天然土と天然系人工土との混合
土などである。また、本発明で使用するアニオン
性電解質ポリマーとしては、繊維素グリコール酸
ナトリウム〔一般にはCMC（ソデイウム・カル
ボキシメチルセルロース）と呼ばれている〕の
他、メチルセルロース，ヒドロキシメチルセルロ
ースなどが適する。このCMCとしてはエーテル
化度（DC）が0.45〜1.00、平均重合度（）が
1000程度のものが好ましい。CMCは通常は粉状
であるので、表層土主材への混合は粉状のまま混
合して撹拌するが、CMCを水溶液にして表層土
に散水してもよい。CMCの表層土主材への配合
量は表層土主材がアンツーカの場合、0.5〜2.5重
量％が適当である。また、本発明で使用するカチ
オン性電解質ポリマーとしてはポリアミド・エピ
クロルヒドリン樹脂（以下PAEと称す）が最適
であるが、他の同種のポリマーを使用することも
可能である。PAEは液状であるので、通常は更
に水で希釈し、予じめ敷きならしたグランド面に
散布する。PAEの配合量はアンツーカの場合、
0.2〜1.7重量％が適当である。即ち、CMCと
PAEとの比が1.5〜2.5：１とするのが好ましい。
なお、前記各配合量は全て無水状態に於いてのも
のである。このようにして、PAEが表層土に散
布されると、表層土中のCMCと加えられたPAE
とがアニオンとカチオンとの電気的性質によつ
て、両者間に吸着作用が働き、化学的に結合して
CMCに耐水性が生じ、大雨の場合でもCMCが土
中から流出することがなくなる。 The main surface soil material used in the present invention is natural soil such as clay, natural artificial soil such as Antuca or edge mud stone powder, or mixed soil of natural soil and natural artificial soil. Suitable examples of the anionic electrolyte polymer used in the present invention include sodium cellulose glycolate (generally called CMC (sodium carboxymethylcellulose)), methylcellulose, hydroxymethylcellulose, and the like. This CMC has a degree of etherification (DC) of 0.45 to 1.00 and an average degree of polymerization () of
About 1000 is preferable. CMC is usually in powder form, so when mixing it into the main material of the surface soil, it is mixed in powder form and stirred, but it is also possible to make an aqueous solution of CMC and sprinkle it on the surface soil. The appropriate amount of CMC to be added to the surface soil main material is 0.5 to 2.5% by weight when the surface soil main material is Antuca. Further, as the cationic electrolyte polymer used in the present invention, polyamide epichlorohydrin resin (hereinafter referred to as PAE) is most suitable, but other polymers of the same type can also be used. Since PAE is in liquid form, it is usually further diluted with water and sprayed onto a pre-leveled ground surface. In the case of Antuca, the blended amount of PAE is
0.2-1.7% by weight is suitable. That is, CMC and
Preferably, the ratio with PAE is 1.5 to 2.5:1.
It should be noted that all of the above amounts are in an anhydrous state. In this way, when PAE is applied to the topsoil, the CMC in the topsoil and the added PAE
Due to the electrical properties of anion and cation, an adsorption effect acts between them, and they are chemically bonded.
CMC becomes water resistant, and CMC will not flow out of the soil even in heavy rain.
なお、表層土には吸水効果や増結効果を高める
為に、塩化カルシウムや塩化マグネシウムなどの
塩化物を適量添加することも可能である。 In addition, it is also possible to add an appropriate amount of chlorides such as calcium chloride and magnesium chloride to the surface soil in order to enhance the water absorption and consolidation effects.
以上の如く、本発明では、アンツーカなどの表
層土主材中に水溶性高分子物質であるCMCなど
のアニオン性電解質ポリマーが混練添加され、且
つ、耐水化剤であるPEAなどのカチオン性電解
質ポリマーが付与されるので、これらの両ポリマ
ーが電気的に吸着作用すると共に、土中成分とも
複雑に化学作用を起し、通常状態ではアンツーカ
などの土壌構造は単位構造であるが、前記物質の
作用により、土粒子間架橋を起して、土壌構造が
団粒構造となる。この結果、通気性、透水性，保
水性が増し、耐水触性と耐風触性がよくなる。従
つて、降雨後に水たまりやぬかるみが生ぜず、雨
後ただちに使用可能で、合成樹脂性の全天侯形に
等しい性能を有し、且つ表層土主材はアンツーカ
などの天然土や天然系人工土であるので、自然な
感触と弾性とを有し、合成樹脂性のグランドのよ
うに競技者が膝、脚、腰などを痛めることがな
く、更に、冬季の霜柱の発生や凍結を起しにく
く、且つ乾燥時の砂ぼこりの発生が少なく、グラ
ンドの維持管理に手間がかからないなどの作用効
果を奏する。加えて、本発明ではアンツーカなど
の表層土主材にCMCなどのアニオン性電解質ポ
リマーを加えて、土粒子とCMCなどとを化学的
に結合させておき、その後に耐水化剤である
PAEなどのカチオン性電解質ポリマーを加え
て、土中のCMCなどと更に化学反応させ、CMC
などを耐水化させるので、大雨の際などにも
CMCなどが流出することがなく、長期に互つて
所期の効果を持続する。 As described above, in the present invention, an anionic electrolyte polymer such as CMC, which is a water-soluble polymer substance, is kneaded and added to the surface soil main material such as Antuca, and a cationic electrolyte polymer such as PEA, which is a water-resistant agent, is added. As a result, both of these polymers act as electrical adsorbents, and also have complex chemical interactions with soil components. Under normal conditions, the soil structure such as Antuca is a unitary structure, but the action of the above substances This causes cross-linking between soil particles, and the soil structure becomes aggregated. As a result, air permeability, water permeability, and water retention are increased, and water contact resistance and wind resistance are improved. Therefore, it does not form puddles or mud after rain, can be used immediately after rain, has the same performance as a synthetic resin all-round surface, and the main material of the surface soil is natural soil such as Antuca or natural artificial soil. Because it has a natural feel and elasticity, it does not hurt the knees, legs, or lower back of athletes like synthetic resin grounds, and it is also less likely to cause frost pillars or freeze in the winter. In addition, there is less dust generated during drying, and maintenance and management of the ground does not require much effort. In addition, in the present invention, an anionic electrolyte polymer such as CMC is added to the main surface soil material such as Antuca to chemically bond soil particles and CMC, and then a water resistance agent is added.
By adding a cationic electrolyte polymer such as PAE and further chemically reacting with CMC in the soil, CMC
etc., so it can be used even during heavy rain.
There is no leakage of CMC, etc., and the desired effects are maintained over a long period of time.
なお、本発明では適量の水の存在が必要である
が、この水は散水付与の他、CMCやPAEを水溶
液にして添加することにより水中付与を行つても
よい。 Although the present invention requires the presence of an appropriate amount of water, this water may be applied by spraying or in water by adding CMC or PAE in the form of an aqueous solution.
実施例 １
運動場の路盤の上に砕石層15cm，火山砂利層10
cm厚に敷きならして基層および中層を形成した。
次にこの上に表層土を敷きならし、ローラーで３
cm厚に締め固めた。この表層土はその主材をアン
ツーカとなし、これに予じめ粉状のCMC（四国
化成工業株式会社製，商品名カセローズSP―
４，エーテル化度0.60±0.03）を１重量％添加し
て、充分に混合撹拌したものを用いた。このよう
にして敷きならした表属土の上から先ず水を１m2
当り８Kg散水し、１日放置した。翌日、その上か
らPAE（昭和高分子株式会社製，商品名ポリフ
イツクス301，濃度30％）の７倍希釈液を１m2当
り約８Kg散布し、更にローラー転圧を加えた。こ
の結果、グランド表面はアンツーカのみで造成し
たものと同様の弾性と滑り特性とを備え、且つ、
アンツーカのみによるものよりも透排水性が良好
で、グランド表面に多量に散水してもぬかるみが
生ぜず、また、乾燥状態での砂ぼこりの発生は少
なかつた。更にグランド表面に高さ５cmの尺角大
の木枠を固定し、木枠の囲り及び表層との接触部
分に粘度を施して漏水を防止するようにし、木枠
内に給水して水深を常時約２cmに保持して、３時
間冠水状態に暴らした。その後、排水して当該部
分を調べたが、ぬかるみも生ぜず、所期のグラン
ド性能を維持していた。Example 1 A crushed stone layer of 15 cm and a volcanic gravel layer of 10 cm are placed on the roadbed of a playground.
A base layer and a middle layer were formed by spreading the material to a thickness of cm.
Next, spread surface soil on top of this and use a roller to
Compacted to cm thickness. The main material of this surface soil is Antuca, and powdered CMC (manufactured by Shikoku Kasei Kogyo Co., Ltd., product name: Caserose SP) is added to it in advance.
4. Etherification degree: 0.60±0.03) was added in an amount of 1% by weight, and the mixture was thoroughly mixed and stirred. First, sprinkle 1 m 2 of water on top of the top soil that has been spread in this way.
I sprinkled 8 kg of water on each plant and left it for one day. The next day, a 7-fold diluted solution of PAE (manufactured by Showa Kobunshi Co., Ltd., trade name: Polyfix 301, concentration 30%) was sprayed on top of it at a rate of about 8 kg per 1 m 2 , and further roller rolling was applied. As a result, the ground surface has elasticity and sliding properties similar to those made with Antuca alone, and
It had better permeability and water drainage than the one using Antuca alone, did not become muddy even when a large amount of water was sprinkled on the ground surface, and generated less dust in dry conditions. Furthermore, a square-sized wooden frame with a height of 5 cm was fixed on the ground surface, and the surrounding area of the wooden frame and the contact area with the surface layer were coated with viscosity to prevent water leakage, and water was supplied into the wooden frame to reduce the water depth. The water was kept at about 2 cm at all times and exposed to water for 3 hours. After that, we drained the water and inspected the area, but found that it did not become muddy and maintained the desired ground performance.
実施例 ２
表層土主材にクレーを用い、且つアニオン性電
解質ポリマーにメチルセルロースを用いて、他は
実施例１と同一の方法でグランドを造成した。完
成したグランドは実施例１のものとほぼ同様の性
質を有していた。Example 2 A ground was constructed in the same manner as in Example 1, except that clay was used as the main material of the surface soil and methyl cellulose was used as the anionic electrolyte polymer. The completed gland had properties almost similar to those of Example 1.
実施例 ３
実施例１と同様の方法で基層及び中層を形成
し、この上にアンツーカを敷きならし、ローラー
で３cm厚に締め固めた。次にCMCの８％水溶液
を１m2当り８Kg散布し、ローラーで締め固めた。
翌日、更にPAEの４％水溶液を１m2当り８Kg散
布してローラー転圧を加えた。完成したグランド
は実施例１と同様の性質を有していた。Example 3 A base layer and a middle layer were formed in the same manner as in Example 1, and antuca was spread on top of the base layer and then compacted to a thickness of 3 cm using a roller. Next, 8 kg of an 8% aqueous solution of CMC was sprinkled per 1 m 2 and compacted with a roller.
The next day, 8 kg/m 2 of a 4% aqueous solution of PAE was further sprayed and roller compaction was applied. The completed gland had properties similar to those of Example 1.
実施例 ４
実施例と同様の方法で表層土をグランド面に敷
きならし、その上からPAEの４％水溶液を１m2
当り10Kg散布し、ローラーで締め固めた。乾燥
後、グランド面は実施例１と同様の性質を有して
いた。Example 4 Surface soil was spread on the ground surface in the same manner as in Example 4, and 1 m 2 of 4% aqueous solution of PAE was poured on top of it.
10 kg per portion was spread and compacted with a roller. After drying, the ground surface had properties similar to Example 1.
Claims (1)
表層土主材にアニオン性電解質ポリマーとカチオ
ン性電解質ポリマーとを加えて、加水状態で締め
固めてグランド表面を形成するグランド造成方
法。 ２ 表層土主材にアニオン性電解質ポリマーを配
合して表層土を形成し、この表層土をグランド面
に敷きならして、加水状態で締め固め、その後に
カチオン性電解質ポリマーをグランド面に添加す
る前記特許請求の範囲第１項記載の競技場などの
グランド造成方法。 ３ 表層土主材にアニオン性電解質ポリマーを配
合して混練した表層土をグランド面に敷きならし
た後、グランド表面に散水して締め固める前記特
許請求の範囲第２項記載の競技場などのグランド
造成方法。 ４ 表層土を敷きならして形成したグランド面に
カチオン性電解質ポリマーの水溶液を散布する前
記特許請求の範囲第２項記載の競技場などのグラ
ンド造成方法。 ５ 表層土主材に粉状のアニオン性電解質ポリマ
ーを配合して混練した表層土をグランド面に敷き
ならし、大幅に希釈したカチオン性電解質ポリマ
ーの水溶液をグランド面に散布して締め固める前
記特許請求の範囲第１項記載の競技場などのグラ
ンド造成方法。 ６ 表層土主材をグランド面に敷きならし、この
グランド表面にアニオン性電解質ポリマーの水溶
液を散布し、更にカチオン性電解質ポリマーを添
加して締め固める前記特許請求の範囲第１項記載
の競技場などのグランド造成方法。 ７ アニオン性電解質ポリマーとして繊維素グリ
コール酸ナトリウムを用いる前記特許請求の範囲
第１項記載の競技場などのグランド造成方法。 ８ アニオン性電解質ポリマーとしてメチルセル
ロース、またはヒドロキシメチルセルロースを用
いる前記特許請求の範囲第１項記載の競技場など
のグランド造成方法。 ９ カチオン性電解質ポリマーとしてポリアミ
ド・エピクロルヒドリン樹脂を用いる前記特許請
求の範囲第２項記載の競技場などのグランド造成
方法。 １０ 表層土主材をアンツーカとなし、繊維素グ
リコール酸ナトリウムを0.5〜2.5重量％，ポリア
ミド・エピクロルヒドリン樹脂を0.2〜1.7重量％
を配合する前記特許請求の範囲第２項記載の競技
場などのグランド造成方法。[Claims] 1. Ground construction in which an anionic electrolyte polymer and a cationic electrolyte polymer are added to a surface soil main material consisting of natural soil and/or natural artificial soil, and the mixture is compacted in a hydrated state to form a ground surface. Method. 2 Form a surface soil by blending an anionic electrolyte polymer into the main soil material, spread this surface soil on the ground surface, compact it with water, and then add a cationic electrolyte polymer to the ground surface. A method for constructing a ground such as a stadium according to claim 1. 3. A ground for a stadium or the like as set forth in claim 2, wherein surface soil is prepared by blending and kneading an anionic electrolyte polymer into the main material of the surface soil, and then spreading it on the ground surface and compacting it by sprinkling water on the surface of the ground. Creation method. 4. The method for constructing a ground for a stadium or the like according to claim 2, which comprises spraying an aqueous solution of a cationic electrolyte polymer on a ground surface formed by leveling surface soil. 5 The above-mentioned patent involves spreading surface soil made by blending powdered anionic electrolyte polymer into the surface soil main material and kneading it on the ground surface, and compacting it by spraying a significantly diluted aqueous solution of cationic electrolyte polymer on the ground surface. A method for constructing a ground such as a stadium as set forth in claim 1. 6. The stadium according to claim 1, wherein the surface soil main material is laid on the ground surface, an aqueous solution of an anionic electrolyte polymer is sprinkled on the ground surface, and a cationic electrolyte polymer is further added and compacted. Ground construction methods such as. 7. The method for constructing a ground for a stadium or the like according to claim 1, using sodium cellulose glycolate as the anionic electrolyte polymer. 8. The method for constructing a ground for a stadium or the like according to claim 1, using methylcellulose or hydroxymethylcellulose as the anionic electrolyte polymer. 9. The method for constructing a ground for a stadium or the like according to claim 2, using a polyamide epichlorohydrin resin as the cationic electrolyte polymer. 10 The main material of the surface layer is Antuca, 0.5 to 2.5% by weight of sodium cellulose glycolate, and 0.2 to 1.7% by weight of polyamide/epichlorohydrin resin.
A method for constructing a ground for a stadium or the like according to claim 2, which comprises blending the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13664582A JPS5927006A (en) | 1982-08-04 | 1982-08-04 | Construction of ground such as athletic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13664582A JPS5927006A (en) | 1982-08-04 | 1982-08-04 | Construction of ground such as athletic field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5927006A JPS5927006A (en) | 1984-02-13 |
| JPS6238481B2 true JPS6238481B2 (en) | 1987-08-18 |
Family
ID=15180156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13664582A Granted JPS5927006A (en) | 1982-08-04 | 1982-08-04 | Construction of ground such as athletic field |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5927006A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771510A (en) * | 1980-10-22 | 1982-05-04 | Tokyo Jiki Insatsu Kk | Method and device for recording arbitrary number of signals at equal interval on rotary recording medium |
-
1982
- 1982-08-04 JP JP13664582A patent/JPS5927006A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5927006A (en) | 1984-02-13 |
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