JPH0359154A - Waterproof sheet and production thereof - Google Patents

Waterproof sheet and production thereof

Info

Publication number
JPH0359154A
JPH0359154A JP1196117A JP19611789A JPH0359154A JP H0359154 A JPH0359154 A JP H0359154A JP 1196117 A JP1196117 A JP 1196117A JP 19611789 A JP19611789 A JP 19611789A JP H0359154 A JPH0359154 A JP H0359154A
Authority
JP
Japan
Prior art keywords
fiber
layer
waterproof sheet
forming
water
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.)
Pending
Application number
JP1196117A
Other languages
Japanese (ja)
Inventor
Masaru Watanabe
優 渡邊
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.)
TACHIBANA SHOKAI KK
Original Assignee
TACHIBANA SHOKAI KK
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 TACHIBANA SHOKAI KK filed Critical TACHIBANA SHOKAI KK
Priority to JP1196117A priority Critical patent/JPH0359154A/en
Publication of JPH0359154A publication Critical patent/JPH0359154A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To obtain the subject product with a granular substance prevented from falling in conveying, etc., without inhibiting water absorbing action by sandwiching the water absorbing and gel-forming granular inorganic substance between two upper and lower fiber layers and then needle punching the resultant sandwich. CONSTITUTION:A layer of a water absorbing and gel-forming inorganic granular substance 3 (e.g. bentonite) is initially sandwiched between two upper and lower fiber layers 1 and 2 and the resultant sandwich is then needle punched to restrict a layer of the aforementioned granular substance 3 with interlaced fiber in which fiber forming at least one fiber layer is interlaced with fiber forming the other fiber layer. The layer of the above-mentioned granular substance 3 is simultaneously densified to afford the objective product. Furthermore, the one fiber layer is cloth and the other fiber layer is a nonwoven fiber layer of heat-shrinkable fiber to carry out needle punching. The needle punched sandwich is subsequently heat-treated to shrink the interlaced fiber. Thereby, constraint of the granular substance and densification are preferably more complete.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、池−小川等の漏水防止、止水工事等各種土
木工事において防水・止水を目的として使用される防水
シー1〜に関し、特にベントナイトのような吸水性でか
つゲル形成性無n物質の粒状物を利用した防水シートの
改良に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a waterproof sheet 1 to be used for the purpose of waterproofing and water stopping in various civil engineering works such as preventing water leakage from ponds and streams, and water stopping construction. In particular, the present invention relates to an improvement in a waterproof sheet using particles of a water-absorbing and gel-forming n-free substance such as bentonite.

[b℃来の技術] 従来からもベントナイトのような吸水性でかつゲル形成
性無機物質の粒状物を利用した各種防水シートが提供さ
れているが、運搬時・施工時等における粒状物の対落下
対策において問題があった。
[Technology from b℃] Various waterproof sheets have been provided using granular water-absorbing and gel-forming inorganic substances such as bentonite, but it is difficult to deal with granular materials during transportation, construction, etc. There was a problem with fall protection.

例えば、米国特許第4,209.568号においては、
非水溶性溶液とそのゲル化剤からなる非水溶性ゲル中に
ベントナイトを分散させた自己接着性を有するベントナ
イト組成物を水透過性セルロース繊維シートの一面に接
着させた防水シートが開示されている。
For example, in U.S. Pat. No. 4,209.568,
A waterproof sheet is disclosed in which a self-adhesive bentonite composition in which bentonite is dispersed in a water-insoluble gel consisting of a water-insoluble solution and its gelling agent is adhered to one surface of a water-permeable cellulose fiber sheet. .

また、特開昭60−240446号においては、通水性
を有するシートに接着剤を付着させ、この接着剤の上に
ベントナイト等の高吸水性・ゲル化性物質の粒状体を均
一に敷設し、接着剤を付着させた同様な通水性シートを
貼り合わせてロールで加圧一体止させた防水シートが開
示されている。
In addition, in JP-A No. 60-240446, an adhesive is attached to a water-permeable sheet, and granules of a highly absorbent and gelatinous substance such as bentonite are uniformly laid on the adhesive. A waterproof sheet is disclosed in which similar water-permeable sheets to which an adhesive is attached are laminated together and held together under pressure with a roll.

[発明が解決しようとする課題] すなわち、これらの防水シートは、ベントナイトのよう
な吸水性でかつゲル形成性無機物質の粒状物をシート村
に接着することにより、運搬時・施工時等における粒状
物の散逸・落下を防止しているものである。
[Problems to be Solved by the Invention] In other words, these waterproof sheets are made by bonding granules of a water-absorbing and gel-forming inorganic substance such as bentonite to the sheet membrane, thereby reducing the granules during transportation, construction, etc. This prevents objects from scattering or falling.

これら接着手段によれば、なるほど粒状物0散逸・落下
はそれなりに防止できるが、一方ではゲル形成性無機物
質が本来の機能を千金に発揮できなくなる難点があった
。すなわち、吸水性・ゲル形成性無機物質は、吸水時の
膨潤作用によって緻密な非透水層・止水層を形成するも
のであるが、このゲル形成性j!!機物質の粒状物が、
非水溶性溶液のゲルで1i縮一体止されている場合、あ
るいは接着剤によってシート材に被着されている場合、
この非水溶性溶液のゲルあるいは接着剤層が吸水性・ゲ
ル形成性無機物質の吸水・膨潤作用を阻害する結果とな
り、吸水から膨潤に至るまで時間を要したり、あるいは
膨潤度が低い等の問題があった。
Although these adhesive means can prevent particulate matter from dissipating and falling to a certain extent, they also have the disadvantage that the gel-forming inorganic substance cannot fully perform its original function. In other words, water-absorbing/gel-forming inorganic substances form a dense water-impermeable layer/water-blocking layer due to swelling action when water is absorbed, but this gel-forming property j! ! The particulate material is
When it is fixed with a gel of a non-aqueous solution, or when it is attached to a sheet material with an adhesive,
The gel or adhesive layer of this water-insoluble solution inhibits the water absorption/swelling action of the water-absorbing/gel-forming inorganic substance, resulting in a time-consuming process from water absorption to swelling, or a low degree of swelling. There was a problem.

そこで、この発明の目的とするところは、吸水・膨潤作
用を阻害することなく、運搬時・施工時等における粒状
物の落下・散逸を有効に防止し得るこの種防水シート及
びその製造法を提供するところにある。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a waterproof sheet of this type that can effectively prevent falling and scattering of particulate matter during transportation, construction, etc., without inhibiting water absorption and swelling, and a method for manufacturing the same. It's there.

[課題を解決するための手段] 上記目的を達成するため、この発明においては、接着剤
、粘着剤の類いを用いることなく、シート材料で吸水性
・ゲル形成性無機物質の粒状物を確実に保持する構成を
採用している。
[Means for Solving the Problems] In order to achieve the above object, in the present invention, particles of a water-absorbing and gel-forming inorganic substance are reliably formed using a sheet material without using adhesives or pressure-sensitive adhesives. The system employs a configuration that maintains the

すなわち、この発明における防水シートは、上下二層の
繊維層間に、吸水性でかつゲル形成性無機物質の粒状物
の層を介在させるとともに、少なくとも一方の繊維層形
成繊維が他方の繊維層形成繊維と交絡状態にあり、その
交絡繊維により前記粒状物を拘束し、粒状物の層を緻密
化状態に保持するようにしたものである。上下2層の繊
維層としては、織物と不m繊維層が好ましい0粒状物は
交絡繊維により緻密化状態に保持されているが、粒状物
の一部、例えば上層部に若干の散水を施し、ゲル化させ
互いに固着させておくことも考えられる。
That is, in the waterproof sheet of the present invention, a layer of granular water-absorbing and gel-forming inorganic material is interposed between the upper and lower fiber layers, and the fibers forming at least one fiber layer are in contact with the fibers forming the other fiber layer. The granules are intertwined with each other, and the granules are restrained by the intertwined fibers to maintain the layer of granules in a densified state. As the upper and lower two fiber layers, a woven fabric and a non-woven fiber layer are preferable.The granular material is kept in a densified state by the intertwined fibers, but a part of the granular material, for example, the upper layer, is slightly sprinkled with water. It is also possible to gel them and make them stick to each other.

このような防水シートの製造法は次の通りであかつゲル
形成性無機物質の粒状物の層を挟持し、これをニードル
パンチングして交絡繊維により粒状物を拘束し、緻密化
することによって簡単に得られる。一方の繊維層を織物
とし、他方を不織繊維層とした場合、この不!a繊維層
を熱収縮性繊維で構成し、ニードルパンチング後、熱処
理または湿熱処理あるいはまた水を含浸しfS tl、
熱処理して交絡繊維を収縮させれば、粒状物の拘束、緻
密化がより完全となる。また、プレス下で熱処理すれば
より一層全体の緻密一体止を測ることができる。
The manufacturing method for such a waterproof sheet is as follows: A layer of granular material of a gel-forming inorganic substance is sandwiched between layers, and this is needle-punched to bind the granular material with interlaced fibers and densify it. can be obtained. When one fiber layer is a woven fabric and the other is a non-woven fiber layer, this non-woven! a The fiber layer is composed of heat-shrinkable fibers, and after needle punching, heat treatment or moist heat treatment or water impregnation fS tl,
If the intertwined fibers are shrunk by heat treatment, the granules will be more completely restrained and densified. In addition, if heat treatment is performed under a press, it is possible to measure the overall tightness and integrity.

熱収縮性繊維からなる不織繊維層としては、ポリプロピ
レン等のポリオレフィン系繊維が好ましい。
As the nonwoven fiber layer made of heat-shrinkable fibers, polyolefin fibers such as polypropylene are preferred.

また、下層のm維層としては、ポリエステル織物、ポリ
プロピレン織物等が適している。その他、ポリオレフィ
ン系のスプリットヤーン、フラットヤーンを用いた織物
も適用可能である。
Moreover, polyester fabric, polypropylene fabric, etc. are suitable as the lower m-fiber layer. In addition, woven fabrics using polyolefin-based split yarns and flat yarns are also applicable.

[作用] 上述のように、少なくとも一方の繊維層形成繊維を他方
の繊維層形成繊維に交絡させ、その交絡を拘束し、緻密
化することにより構成された防水シートは、吸水性・ゲ
ル形成性無機物質の粒状物に加工が加えられておらず、
また、接着剤を使用していないため、吸水・膨潤作用が
阻害されない。
[Function] As mentioned above, a waterproof sheet constructed by intertwining at least one fiber layer-forming fiber with the other fiber layer-forming fiber, restraining the intertwining, and densifying the sheet has water absorption and gel-forming properties. No processing is added to the granular inorganic material,
In addition, since no adhesive is used, water absorption and swelling effects are not inhibited.

従って、吸水から膨潤に至るまでの時間も早く、また、
ゲル形成性無i物質が本来具有している膨潤度を千金に
発揮させることができる。また、このゲル形成性無機物
質の粒状物は、交絡繊維により拘束され、緻密化状態に
保持されているため、運搬時、施工時における脱落、飛
敗も有効に防止されている0粒状物の一部に若干の散水
を施して部分的にゲル化させ互いに固着させると脱落の
可能性はさらに少いものとなる。
Therefore, the time from water absorption to swelling is quick, and
It is possible to fully exhibit the degree of swelling inherent in the gel-forming substance. In addition, the gel-forming inorganic substance particles are restrained by intertwined fibers and maintained in a densified state, so that they are effectively prevented from falling off or flying off during transportation or construction. If a small amount of water is applied to some areas to cause gelation and stick together, the possibility of them falling off will be further reduced.

また、このような防水シートの製造法は、二層の繊維層
間に粒状物の層を挟持し、ニードルパンチングしたもの
で、ニードルパンチングによる繊維の交絡状態により粒
状物は確実に拘束・保持される。しかも、粒状物には加
工を施さず、また、接着剤も使用しないので、ゲル形成
性t!#機物質の吸水・膨潤作用を千金に発揮させ得る
製造法となっている。
In addition, the manufacturing method for such a waterproof sheet is to sandwich a layer of granular material between two layers of fibers and perform needle punching, and the granular material is reliably restrained and held due to the intertwined state of the fibers due to needle punching. . Moreover, since no processing is applied to the granules and no adhesive is used, gel-forming properties are excellent! #This is a manufacturing method that can fully demonstrate the water absorption and swelling effects of organic materials.

一方の繊維層を織物とし、他方を不織繊維層とするとと
もに、この不織繊維層を熱収縮性繊維で椙成し、ニード
ルパンチング後、熱処理または湿熱処理あるいはまた水
を含浸した後熱処理して交絡繊維を収縮させる方法、さ
らにはプレス下で熱処理する方法をとれば、粒状物の拘
束、緻密化がより完全となる。湿熱処理あるいはまた水
を含浸した後熱処理する方法は、不織繊維層の熱収縮効
率を上げる効果があり、また、粒状物の上層部の一部が
ゲル化されるため、粒状物の拘束、緻密化、これに伴う
シート材との一体化がより確実となる。
One of the fiber layers is a woven fabric and the other is a non-woven fiber layer, and the non-woven fiber layer is made of heat-shrinkable fibers, and after needle punching, heat treatment or moist heat treatment, or water impregnation and heat treatment. If a method of shrinking the intertwined fibers or a method of heat treatment under a press is used, the restriction and densification of the granular material will be more complete. Moist heat treatment or a method of impregnating with water and then heat treatment has the effect of increasing the heat shrinkage efficiency of the nonwoven fiber layer, and also gels a part of the upper layer of the granules, thereby reducing the restriction of the granules. Densification and the resulting integration with the sheet material become more reliable.

なお、一部ゲル化した粒状物は乾燥によって本来の吸水
・膨潤機能はそのまま具有しており、何等問題は無い。
Note that the partially gelled granules retain their original water absorption and swelling functions when dried, and there is no problem.

また、不織繊維層と織物との間にゲル形成性無機物質の
粒状物を介在させた場合、たとえゲル形成性無機物質が
過剰に膨潤して泥水化した場合にも、不織繊維層の存在
により、水みちの生成が抑制される。一方、上層・下層
ともに不織繊維屑を用いた場合、施工作業時において加
わる張力により延ばされる懸念があるが、一方を織物と
しておけば、この張力に耐える強度が得られる。
In addition, when particles of a gel-forming inorganic substance are interposed between the non-woven fiber layer and the fabric, even if the gel-forming inorganic substance swells excessively and becomes muddy water, the non-woven fiber layer Its presence suppresses the formation of water channels. On the other hand, if non-woven fiber waste is used for both the upper and lower layers, there is a concern that it will be stretched by the tension applied during construction work, but if one is made of woven fabric, it will have the strength to withstand this tension.

[実施rIA] 図面は、この発明に係る防水シート及びその製造法の一
実施例を示す断面図で、上下二層の繊維層1.2間に、
吸水性でかつゲル形成性無機物質の粒状物3の層を介在
させ、繊維層1を形成する繊維を他方の繊維層2を形成
する繊維と交絡させ、その交絡状態によって前記粒状物
3を拘束し、粒状物の層を緻密化状態に保持して製造し
た防水シーhを示している。吸水性でかつゲル形成性無
機物質の粒状物3としては、ベントナイ1−を使用した
が、その地回等の機能を発揮する天然1合成の無機物質
が使用できる。
[Implementation rIA] The drawing is a cross-sectional view showing an embodiment of the waterproof sheet and the method for manufacturing the same according to the present invention, in which the space between the upper and lower fiber layers 1.2 is
A layer of particulate matter 3 made of a water-absorbing and gel-forming inorganic substance is interposed, the fibers forming the fiber layer 1 are intertwined with the fibers forming the other fiber layer 2, and the particulate matter 3 is restrained by the entangled state. 2 shows a waterproof sheet h manufactured by maintaining a layer of granules in a densified state. Bentonite 1- was used as the water-absorbing and gel-forming inorganic substance granules 3, but any synthetic inorganic substance 3 that exhibits functions such as natural 1 can be used.

次表は繊維素材、ベントナイト量等を変えて製造した防
水シートの実施例で、表示の通り、優れた透水係数を示
した。
The following table shows examples of waterproof sheets manufactured with different fiber materials, bentonite amounts, etc., and as shown, they exhibited excellent water permeability coefficients.

[発明の効果] この発明の防水シート及びその製造法は以上の通りで、
接着剤を使用したり、ゲル形成性無機物質の粒状物を自
己接着性を有する組成物化する場合と異なり、上下二層
の繊維層形成繊維の交絡状態により、粒状物を拘束、緻
密化して保持するものであるから、当該粒状物が有する
本来吸水・膨潤機能を阻害することなく千金に発揮させ
ることができ、≠た、運搬・施工時における粒状物の脱
落、散逸も有効に防止し得たのである。
[Effect of the invention] The waterproof sheet of this invention and its manufacturing method are as described above,
Unlike the use of adhesives or the formation of gel-forming inorganic particles into self-adhesive compositions, the intertwined state of the fibers forming the upper and lower fiber layers restrains, densifies, and holds the particles. Because of this, the granules can effectively exhibit their inherent water absorption and swelling functions without inhibiting them, and also effectively prevent the granules from falling off and dissipating during transportation and construction. It is.

また、その製造工程も簡略化されるので、コストダウン
を図り得る利点を有している。
Furthermore, since the manufacturing process is simplified, it has the advantage of reducing costs.

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

図面は、この発明に係る防水シート及びその製造法の一
実施例を示す断面図である。 1.2・・・・・・上下二層の繊維層 3・・・・・・吸水性でかつゲル形成性無機物質の粒状
The drawing is a sectional view showing an embodiment of a waterproof sheet and a method for manufacturing the same according to the present invention. 1.2... Upper and lower two fiber layers 3... Water-absorbing and gel-forming inorganic substance granules

Claims (9)

【特許請求の範囲】[Claims] (1)上下二層の繊維層間に、吸水性でかつゲル形成性
無機物質の粒状物の層を介在させ、少なくとも一方の繊
維層形成繊維が他方の繊維層形成繊維と交絡し、該交絡
繊維により前記粒状物を拘束し、該粒状物の層を緻密化
状態に保持していることを特徴とする防水シート。
(1) A layer of granular water-absorbing and gel-forming inorganic material is interposed between the upper and lower two fiber layers, and at least one fiber layer-forming fiber is entangled with the other fiber layer-forming fiber, and the entangled fibers are interposed between the upper and lower two fiber layers. A waterproof sheet characterized in that the granular material is restrained by a layer of the granular material to maintain a layer of the granular material in a densified state.
(2)繊維層の一方が織物で、他方が不織繊維層である
請求項1記載の防水シート。
(2) The waterproof sheet according to claim 1, wherein one of the fibrous layers is a woven fabric and the other is a non-woven fibrous layer.
(3)粒状物の一部がゲル化し、互いに固着した請求項
1または2記載の防水シート。
(3) The waterproof sheet according to claim 1 or 2, wherein some of the granules are gelled and adhered to each other.
(4)上下二層の繊維層間に、吸水性でかつゲル形成性
無機物質の粒状物の層を挟持し、これをニードルパンチ
ングして交絡繊維により粒状物を拘束し、緻密化するこ
とを特徴とする防水シートの製造法。
(4) A layer of water-absorbing and gel-forming inorganic granular material is sandwiched between the upper and lower fiber layers, and this is needle-punched to bind the granular material with interlaced fibers and make it dense. A method for manufacturing a tarpaulin sheet.
(5)一方の繊維層が織物であり、他方が不織繊維層で
ある請求項4記載の防水シートの製造法。
(5) The method for producing a waterproof sheet according to claim 4, wherein one of the fibrous layers is a woven fabric and the other is a non-woven fibrous layer.
(6)不織繊維層が熱収縮性繊維からなる請求項5記載
の防水シートの製造法。
(6) The method for producing a waterproof sheet according to claim 5, wherein the nonwoven fiber layer is made of heat-shrinkable fibers.
(7)ニードルパンチング後のシートを熱処理し、交絡
繊維を収縮する請求項6記載の防水シートの製造法。
(7) The method for manufacturing a waterproof sheet according to claim 6, wherein the sheet after needle punching is heat-treated to shrink the entangled fibers.
(8)ニードルパンチング後のシートを湿熱処理または
水を含浸した後熱処理する請求項6記載の防水シートの
製造法。
(8) The method for manufacturing a waterproof sheet according to claim 6, wherein the sheet after needle punching is subjected to a wet heat treatment or a heat treatment after being impregnated with water.
(9)プレス下で熱処理する請求項7または8記載の防
水シートの製造法。
(9) The method for producing a waterproof sheet according to claim 7 or 8, wherein the waterproof sheet is heat-treated under press.
JP1196117A 1989-07-27 1989-07-27 Waterproof sheet and production thereof Pending JPH0359154A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1196117A JPH0359154A (en) 1989-07-27 1989-07-27 Waterproof sheet and production thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1196117A JPH0359154A (en) 1989-07-27 1989-07-27 Waterproof sheet and production thereof

Publications (1)

Publication Number Publication Date
JPH0359154A true JPH0359154A (en) 1991-03-14

Family

ID=16352525

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1196117A Pending JPH0359154A (en) 1989-07-27 1989-07-27 Waterproof sheet and production thereof

Country Status (1)

Country Link
JP (1) JPH0359154A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102582141A (en) * 2012-02-22 2012-07-18 苏州金尚豪纺织有限公司 Moisture-conductive thermal insulation fabric

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5238716A (en) * 1976-08-20 1977-03-25 Chisso Corp Sheet for civil engineering work material
JPS60240446A (en) * 1984-05-15 1985-11-29 クニミネ工業株式会社 Waferproof material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5238716A (en) * 1976-08-20 1977-03-25 Chisso Corp Sheet for civil engineering work material
JPS60240446A (en) * 1984-05-15 1985-11-29 クニミネ工業株式会社 Waferproof material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102582141A (en) * 2012-02-22 2012-07-18 苏州金尚豪纺织有限公司 Moisture-conductive thermal insulation fabric

Similar Documents

Publication Publication Date Title
RU2059034C1 (en) Multilayer fabric
JP4740974B2 (en) A desiccant comprising a highly hygroscopic nonwoven fabric structure
US5091234A (en) Composite water barrier sheet
CA1122509A (en) Surgical sponge material
RU2076914C1 (en) Process of continuous manufacture of water- and oil-proof sealing mat (variants)
GB2202185A (en) A water-impermeable sealing mat
KR840000371A (en) Mat-type composite and its manufacturing method
CN1049936C (en) Natural fibred nonwoven fabrics and application of same
CA2000662A1 (en) Composite fireproof and waterproof textile and clothing and seat comprising such a textile
JPH0337522B2 (en)
RU93004700A (en) METHOD OF MANUFACTURING A COMPLETE MAT, CONTAINING A REFLECTED, UNSCENDABLE FOR WATER AND / OR OIL CLAY
JPH0359154A (en) Waterproof sheet and production thereof
CA2089331A1 (en) Sealing sheeting of swellable clay impervious to water and/or oil
CA2067391A1 (en) Liquid absorbent block
CZ4997U1 (en) Insulating felt
JPH0548923U (en) Laminate
JPS6047101B2 (en) Blanket for metal folded roof sheets
JPH047943Y2 (en)
EP1624120A2 (en) Multilayer sheath particularly for insulating walls and lofts of buildings
CN210911546U (en) Polymer waterproofing membrane
US6143394A (en) Nonwoven sorbent manhole apron
JPH047167Y2 (en)
JP2023121464A (en) Water-absorbing sheet and water-impervious facility
JPS6321267A (en) Cloth for curing concrete
JPH0762304B2 (en) Rapping material for running prevention