JP2007160140A - Capping sheet for waste disposal site and its capping method of construction - Google Patents

Capping sheet for waste disposal site and its capping method of construction Download PDF

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JP2007160140A
JP2007160140A JP2005356160A JP2005356160A JP2007160140A JP 2007160140 A JP2007160140 A JP 2007160140A JP 2005356160 A JP2005356160 A JP 2005356160A JP 2005356160 A JP2005356160 A JP 2005356160A JP 2007160140 A JP2007160140 A JP 2007160140A
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capping
sheet
moisture
layer
capping sheet
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Hiroyuki Sakamoto
浩之 坂本
Masahiro Ishikawa
雅洋 石川
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Toyobo Co Ltd
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Toyobo Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/30Landfill technologies aiming to mitigate methane emissions

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a capping sheet preventing slipping down of covered soil on a slope while reducing a treatment cost of leachate, and to provide a capping method of construction for a waste disposal site using the capping sheet. <P>SOLUTION: The capping sheet has a covered soil slipping down prevention layer comprising a three-dimensional mesh having a thickness of 5 mm or more and a fiber density of 20 kg/m<SP>3</SP>to 200 kg/m<SP>3</SP>on a protection layer side of a moisture-permeable water-proof sheet comprising a moisture-permeable water-proofing layer and a protection layer covering at least one. Further, in the capping sheet, the moisture-permeable water-proof layer is a member selected from a fine porous membrane, a nonporous moisture-permeable sheet, a melt-blown non-woven fabric and a flash-spinning non-woven fabric, and the protection layer comprises a long fiber non-woven fabric having a moisture permeability of 2,000 g/m<SP>2</SP>/24 hour or more and water-resistance pressure of 50 kPa or more. Further, in the capping method of construction, the capping sheet is laid such that the three-dimensional mesh becomes a surface, and the covered soil layer is formed on it. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、閉鎖段階の廃棄物最終処分場のキャッピングシートおよびその工法に関に関する。   The present invention relates to a capping sheet for a waste final disposal site in a closed stage and a method for the same.

都市への人口の集中、生産活動・消費活動の活発化に比例して、廃棄物が大量に発生し、問題となっている。これらの廃棄物は、焼却施設で焼却されたり、分別されて資源回収されたりする場合もあるが、前者は設備の導入費用の問題や周辺住民の反対などがあり施設数も限られ、処理量に制限がある。後者の場合では、プラスチック・金属・紙などの比較的高価な材料のみの回収である。また、食品残渣や生ごみ類はそのまま廃棄されることもあり、悪臭の問題、犬・猫・鳥類がごみの中の食べ物を猟食する問題が深刻化している。
またごみの中に混入している有害物質や、食品からの水溶性物質が近隣の河川・湖沼に流出し、作物や魚介類に被害をもたらしたり、下流の河川水を利用する工場や浄水場に影響を与えることもある。
A large amount of waste is generated in proportion to the concentration of the population in the city and the activation of production / consumption activities. These wastes may be incinerated at the incineration facility, or separated and recovered as resources, but the former is limited in the number of facilities due to problems such as the cost of introducing equipment and the opposition of the surrounding residents. There are limitations. In the latter case, only relatively expensive materials such as plastic, metal, paper, etc. are recovered. In addition, food residues and food waste are discarded as they are, and the problem of bad odor and the problem of dogs, cats and birds hunting food in the garbage have become serious.
In addition, harmful substances mixed in garbage and water-soluble substances from foods flow into nearby rivers and lakes, causing damage to crops and seafood, and factories and water treatment plants that use downstream river water May also be affected.

廃棄物最終処分場は、廃棄物の埋め立てが完了すると、廃棄物が表面に露出しないように、覆土により表層を形成するようにしている。従来、この表層を形成する最終覆土工法としては、一般の土砂等による覆土工法や遮水シートを用いたキャッピング工法が選択的に用いられてきた。   In the waste final disposal site, when the landfill of the waste is completed, a surface layer is formed by covering soil so that the waste is not exposed to the surface. Conventionally, as a final earth covering method for forming the surface layer, a common earth covering method using earth and sand or a capping method using a water shielding sheet has been selectively used.

土砂等による覆土工法は、通気性・透水性があり、降雨時の雨水が埋立地内に浸透し、廃棄物中の空気循環を促して好気的環境を作る為に、有機物が適切に分解され、廃棄物の分解・安定化の時期を早めることができる。しかし、浸透水が多ければ分解が速く進むわけではない。一般的な日本国内の降雨量は、廃棄物最終処分場内の廃棄物を分解・安定化には過剰であり、分解によって汚染された浸透水の処理・管理に多大な費用を要するという問題があった。   The soil covering method using earth and sand is breathable and permeable, so that rainwater penetrates into the landfill and promotes air circulation in the waste to create an aerobic environment. , It is possible to expedite the timing of decomposition and stabilization of waste. However, if there is much osmotic water, decomposition does not proceed faster. In general, rainfall in Japan is excessive for decomposing and stabilizing the waste in the final disposal site, and there is a problem that it requires a large amount of money to treat and manage the permeated water contaminated by the decomposition. It was.

一方、遮水シートを用いたキャッピング工法は、通気性と透水性がないために、降雨時の雨水は地表水としてそのまま埋立地外へ排水されるので、廃棄物の保有水以外は処理・管理する必要がなく、水処理に関する費用を軽減できる。しかし、遮水シートによるキャッピングによって、空気や水が遮断される為に埋立地内の環境が嫌気的となる。これにより有機物の分解時にメタンガスやアンモニアなどの悪性ガスを発生させる。また、埋立地内の廃棄物の分解・安定化するまでの期間が長期化し、最終処分場の維持・管理費用が軽減できないという問題があった。     On the other hand, the capping method using a water-impervious sheet is not breathable and permeable, so rainwater during rainfall is drained out of the landfill as surface water. There is no need to do so, and the costs associated with water treatment can be reduced. However, the environment in the landfill becomes anaerobic because the air and water are blocked by the capping by the water shielding sheet. This generates malignant gases such as methane gas and ammonia during the decomposition of organic matter. In addition, there is a problem that the time until the waste in the landfill is decomposed and stabilized is prolonged, and the maintenance and management costs of the final disposal site cannot be reduced.

そこで、透水性部分と遮水性部分を帯状に形成し、すべての遮水性部分を斜面に形成させて透水量を制御しつつ、内部に侵入しなかった地表水は埋立地外に排水する工法が知られている(例えば特許文献1参照)。
また、透湿防水シートで処分場全体を覆うようにした廃棄物処分場も知られている(例えば特許文献2参照)
Therefore, a method of draining surface water that did not enter the interior of the landfill while controlling the amount of water permeability by forming the water-permeable part and the water-impervious part in a belt shape and controlling all the water-impervious parts on the slopes. It is known (see, for example, Patent Document 1).
A waste disposal site is also known in which the entire disposal site is covered with a moisture permeable waterproof sheet (see, for example, Patent Document 2).

特許第3354920号公報Japanese Patent No. 3354920 特開平11−10104号公報Japanese Patent Laid-Open No. 11-10104

しかしながら前者は、廃棄物内への少量の水が浸透することを前提にしているが、その施工には手間を要する工法であり、斜面を形成する為に廃棄物処理量が面積に対して少なくなるという問題があった。また後者は、固定ピンのみでシートを固定しており、強風によりシートが剥がれたり、破れたりする問題があった。さらにキャッピングシートを露出することは、外観上好ましくなかった。
キャッピングシートを土で覆うことも考えられるが、斜面では降雨などにより覆土とシートの境界を浸透水が流下し、覆土が斜面を滑落するという問題があった。
However, the former is based on the premise that a small amount of water permeates into the waste. However, it is a construction method that requires labor, and the amount of waste treated is small relative to the area in order to form a slope. There was a problem of becoming. In the latter case, the sheet is fixed only by fixing pins, and there is a problem that the sheet is peeled off or torn by a strong wind. Furthermore, exposing the capping sheet was not preferable in appearance.
Although it is conceivable to cover the capping sheet with soil, on the slope, there was a problem that the permeated water flowed down the boundary between the cover soil and the sheet due to rain, etc., and the soil covered the slope.

本発明は、上述した従来の廃棄物処理場のキャッピング工法の有する問題点に鑑み、浸出水の処理費用を軽減しつつ、斜面上の覆土の滑落を防止したキャッピングシートを提供することを課題とする。また、そのキャッピングシートを用いた廃棄物処分場のキャッピング工法を提供することを課題とする。   In view of the problems of the above-described conventional waste disposal site capping method, it is an object of the present invention to provide a capping sheet that reduces the leachate treatment cost and prevents the cover soil from sliding down on the slope. To do. Another object is to provide a capping method for a waste disposal site using the capping sheet.

本発明は、上記の課題を解決するために鋭意検討した結果、到達したものであり、下記に詳細を述べる。   The present invention has been achieved as a result of intensive studies to solve the above problems, and will be described in detail below.

第1の発明は、透湿防水性層と少なくとも一方を覆う保護層からなる透湿防水シートの保護層側に覆土滑落防止層を有したことを特徴とするキャッピングシートである。   According to a first aspect of the present invention, there is provided a capping sheet characterized in that a moisture-permeable waterproof sheet comprising a moisture-permeable and waterproof layer and a protective layer covering at least one has a cover soil slip-off preventing layer on the protective layer side.

第2の発明は、透湿防水層が微多孔膜、無孔透湿シート、メルトブロー不織布、フラッシュ紡糸不織布から選択された部材であることを特徴とする第1の発明に記載のキャッピングシートである。   The second invention is the capping sheet according to the first invention, wherein the moisture-permeable waterproof layer is a member selected from a microporous membrane, a non-porous moisture-permeable sheet, a melt blown nonwoven fabric, and a flash spun nonwoven fabric. .

第3の発明は、保護層が長繊維不織布からなることを特徴とする第1又は2の発明に記載のキャッピングシートである。   A third invention is the capping sheet according to the first or second invention, wherein the protective layer is made of a long-fiber nonwoven fabric.

第4の発明は、滑落防止層が厚さ5mm以上、繊維密度20kg/m3以上200kg/m3以下の立体網状体よりなることを特徴とする第1〜3いずれかの発明に記載のキャッピングシートである。 According to a fourth aspect of the present invention, in the capping according to any one of the first to third aspects, the slip-preventing layer comprises a three-dimensional network having a thickness of 5 mm or more and a fiber density of 20 kg / m 3 or more and 200 kg / m 3 or less. It is a sheet.

第5の発明は、透湿度が2000g/m2/24hr以上であり、耐水圧が50kPa以上であることを特徴とする第1〜第4いずれかの発明に記載のキャッピングシートである。 Fifth invention has moisture permeability 2000g / m 2 / 24hr or more, first to capping sheet according to the fourth one of the invention, wherein the water pressure is not less than 50 kPa.

第6の発明は、引張強さ100N/5cm以上であり、且つ引き裂き強さが20N以上である第1〜第5いずれかの発明に記載のキャッピングシートである。   A sixth invention is the capping sheet according to any one of the first to fifth inventions, which has a tensile strength of 100 N / 5 cm or more and a tear strength of 20 N or more.

第7の発明は、最終処分場のキャッピング工法において、請求項1〜6いずれかに記載のキャッピングシートを立体網状体を表面となるように敷設し、その上に覆土層を形成することを特徴とするキャッピング工法である。   A seventh invention is characterized in that, in the capping method of the final disposal site, the capping sheet according to any one of claims 1 to 6 is laid so that the three-dimensional network is the surface, and a covering layer is formed thereon. This is a capping method.

本発明によれば、最終処分場の閉鎖時のキャッピング工法において、遮水機能による雨水の廃棄物内部への侵入を制御して水処理費用の低減が可能であり、透湿機能による発生ガスの放出も可能なうえ、斜面部分での覆土の滑落防止が可能なものとなる。したがって、本発明のキャッピングシートを用いることによって、覆土後の歩行が安全となる。   According to the present invention, in the capping method at the time of closing the final disposal site, it is possible to reduce the cost of water treatment by controlling the intrusion of rainwater into the waste by the water shielding function, and the generated gas by the moisture permeability function can be reduced. In addition to being able to discharge, it is possible to prevent the soil covering from falling on the slope. Therefore, walking after soiling is safe by using the capping sheet of the present invention.

以下に、本発明を詳細に説明する。   The present invention is described in detail below.

本発明のキャッピングシートは透湿防水層の少なくとも一方を保護層で覆った構造の透湿防水シートからなる。遮水シートが透湿防水層および保護層の2層より形成される場合、保護層は覆土側となり、透湿防水層は廃棄物側となるが、透湿防水層と廃棄物の間には不織布からなる保護材を配置することが必要である。廃棄物には鋭利または突起物が混入していることがあり、それによって透湿防水層が敗れるのを防ぐ為である。保護層/透湿防水層/保護層の3層からなる遮水シートよりなるキャッピングシートにおいても、廃棄物との間に適宜、保護材を配置しても良い。   The capping sheet of the present invention comprises a moisture permeable waterproof sheet having a structure in which at least one of the moisture permeable waterproof layers is covered with a protective layer. When the water shielding sheet is formed of two layers, a moisture permeable waterproof layer and a protective layer, the protective layer is on the soil covering side and the moisture permeable waterproof layer is on the waste side, but between the moisture permeable waterproof layer and the waste It is necessary to arrange a protective material made of non-woven fabric. This is to prevent sharp or protrusions from being mixed in the waste, thereby preventing the moisture-permeable waterproof layer from being damaged. Even in a capping sheet made of a water shielding sheet composed of three layers of a protective layer / a moisture permeable waterproof layer / a protective layer, a protective material may be appropriately disposed between the waste and the waste.

透湿防水層は、微多孔膜、メルトブロー不織布、フラッシュ紡糸不織布の中から選択される。
微多孔膜は、樹脂組成物に無機充填材を分散させて延伸により多孔化したものや、樹脂に発泡剤を加えて製膜して加熱発泡により多孔化したもの、さらには製膜後に押出し助剤を蒸発除去したあとに延伸して多孔化したものなどより選ぶことが可能である。
無孔透湿シートは、ペルプレン(東洋紡績社製)やハイトレル(東レ・デュポン社製)などのハードセグメントとソフトセグメントよりなるブロック共重合ポリエステルを原料として得ることができる。
The moisture permeable waterproof layer is selected from a microporous membrane, a melt blown nonwoven fabric, and a flash spun nonwoven fabric.
Microporous membranes are obtained by dispersing an inorganic filler in a resin composition and making it porous by stretching, forming a membrane by adding a foaming agent to a resin and making it porous by heat foaming, and further assisting extrusion after film formation. It is possible to select from those obtained by evaporating and removing the agent and then stretching it to make it porous.
The non-porous moisture-permeable sheet can be obtained using a block copolymer polyester composed of a hard segment and a soft segment such as Perprene (manufactured by Toyobo Co., Ltd.) and Hytrel (manufactured by Toray DuPont).

メルトブロー不織布は、繊維径5μm以下の繊維より構成されたものが好適である。また、メルトブロー不織布はカレンダー加工により繊維充填率を増やし、繊維間隙を小さくしたものが好適である。繊維が太いと繊維間隙が大きく、防水性が発現しない。素材は、ポリエチレン、ポリプロピレンなどのポリオレフィン系、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリプロピレンテレフタレートなどのポリエステル系、ポリアミド系などの熱可塑性樹脂を用いることが可能であるが、加工性、価格などを考慮するとポリプロピレン製が好ましい。   The melt blown nonwoven fabric is preferably composed of fibers having a fiber diameter of 5 μm or less. Moreover, the melt blown nonwoven fabric preferably has a fiber filling rate increased by calendering and a fiber gap reduced. If the fiber is thick, the fiber gap is large and waterproofness is not exhibited. As the material, thermoplastic resins such as polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polypropylene terephthalate, and polyamides can be used. The product is preferred.

フラッシュ紡糸不織布は、その素材は、ポリエチレン、ポリプロピレンなどのポリオレフィン系、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリプロピレンテレフタレートなどのポリエステル系、ポリアミド系などの熱可塑性樹脂を用いることが可能であるが、入手の容易さや価格などを考慮するとポリエチレン製が好ましい。   As the material of the flash spun nonwoven fabric, thermoplastic materials such as polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate, and polyamides can be used. Considering the sheath and price, polyethylene is preferable.

保護層は長繊維不織布であり、スパンボンド不織布が好適である。素材はポリエチレン、ポリプロピレンなどのポリオレフィン系、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリプロピレンテレフタレートなどのポリエステル系、ポリアミド系などの熱可塑性樹脂を用いることが可能である。また、繊維形態も単一成分である必要はなく、芯鞘型、サイドバイサイド型、六葉型などの複合繊維タイプでも構わない。さらに、繊維断面も中実(丸断面)に限定されず、三角断面、扁平断面などの異型断面繊維であっても構わない。不織布としての機械的強力、価格などを考慮するとポリエステル系スパンボンド不織布、特にポリエチレンテレフタレートスパンボンド不織布がより好ましい。   The protective layer is a long fiber nonwoven fabric, and a spunbond nonwoven fabric is suitable. As the material, thermoplastic resins such as polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate, and polyamides can be used. Further, the fiber form does not have to be a single component, and may be a composite fiber type such as a core-sheath type, a side-by-side type, or a six-leaf type. Furthermore, the fiber cross section is not limited to a solid (round cross section), and may be an irregular cross section fiber such as a triangular cross section or a flat cross section. In view of mechanical strength as a nonwoven fabric, price, etc., a polyester-based spunbond nonwoven fabric, particularly a polyethylene terephthalate spunbond nonwoven fabric is more preferable.

覆土側に配置される長繊維不織布は、機械的特性の優れた熱圧着タイプであることが好ましい。また、廃棄物側に配置される長繊維不織布は、クッション性および追従性よりニードルパンチタイプであることが好ましい。   The long fiber nonwoven fabric disposed on the soil covering side is preferably a thermocompression bonding type having excellent mechanical properties. Moreover, it is preferable that the long fiber nonwoven fabric arrange | positioned at the waste side is a needle punch type from cushioning property and followable | trackability.

覆土側に配置される不織布の表面には立体網状体が配置されている。立体網状体は厚み5mm以上であることが好ましく、さらに10mm以上がより好ましい。立体網状体の厚みが5mm未満の場合、立体網状体で保持できる土の量が少なく、土の滑落防止機能を十分に発現しない。また、厚みの上限はないが20mm以上では敷設前のロール形状が大きくなりすぎて、取り扱いにくくなったり、運送コスト、保管コストが高くなるのであまり好ましくない。   A three-dimensional network is disposed on the surface of the nonwoven fabric disposed on the soil covering side. The three-dimensional network is preferably 5 mm or more in thickness, and more preferably 10 mm or more. When the thickness of the three-dimensional network is less than 5 mm, the amount of soil that can be held by the three-dimensional network is small, and the function of preventing the soil from sliding down is not sufficiently exhibited. Moreover, although there is no upper limit of the thickness, if it is 20 mm or more, the roll shape before laying becomes too large, and it becomes difficult to handle, and the transportation cost and the storage cost become high.

本発明で言う立体網状体とは、熱可塑性樹脂よりなる連続した線条を曲がりくねらせ、互いに接触させて該接触部の大部分が融着した3次元立体網状体である(例えば特許34544373号公報)   The three-dimensional network referred to in the present invention is a three-dimensional three-dimensional network in which continuous filaments made of a thermoplastic resin are twisted and brought into contact with each other so that most of the contact portions are fused (for example, Japanese Patent No. 34544373). (Publication)

立体網状体の繊維密度は、20kg/m3以上200kg/m3以下が好ましい。より好ましくは50kg/m3以上100kg/m3未満である。立体網状体の繊維密度が20kg/m3以下の場合、覆土の保持能力が低く、覆土の滑落防止機能を発現しない。繊維密度が200kg/m3を超えると、シート重量が重くなり取り扱いにくくなるので好ましくない。 The fiber density of the three-dimensional network is preferably 20 kg / m 3 or more and 200 kg / m 3 or less. More preferably, it is 50 kg / m 3 or more and less than 100 kg / m 3 . When the fiber density of the three-dimensional network is 20 kg / m 3 or less, the covering ability of the covering soil is low, and the function of preventing the covering soil from sliding down is not exhibited. If the fiber density exceeds 200 kg / m 3 , the sheet weight becomes heavy and it becomes difficult to handle, which is not preferable.

さらに立体網状体の素材は、ポリエチレン、ポリプロピレンなどのポリオレフィン系、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリプロピレンテレフタレートなどのポリエステル系、ポリアミド系などの熱可塑性樹脂を用いることが可能である。   Further, as the material of the three-dimensional network, thermoplastic resins such as polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate, and polyamides can be used.

立体網状体を構成する繊維は、0.5mm以上5mm以下の繊維径であることが好ましい。より好ましくは0.5mm以上3mm以下である。0.5mmより細い繊維から構成される場合は、覆土の重量に対する抵抗が弱く、十分な覆土保持機能を発現しない。また5mmを超える繊維から構成した場合は、繊維本数が少なくなって覆土保持機能が低下するので好ましくない。   It is preferable that the fibers constituting the three-dimensional network have a fiber diameter of 0.5 mm or more and 5 mm or less. More preferably, it is 0.5 mm or more and 3 mm or less. In the case of being composed of fibers thinner than 0.5 mm, resistance to the weight of the soil covering is weak, and a sufficient soil covering retaining function is not exhibited. Moreover, when it comprises from the fiber exceeding 5 mm, since the number of fibers decreases and a covering soil retention function falls, it is unpreferable.

透湿防水層と保護層からなる透湿防水シートを得る方法および覆土滑落防止層の複合方法としては、一般的に知られる熱ラミネート法、接着剤による複合方法などが用いることができる。特に透湿防水層が微多孔膜からなる場合は、接着剤による複合方法が好ましい。立体網状体を複合する場合は、繊維密度が低いので、接着剤による複合はその接着強度を得ることが難しい為、熱圧着法が好ましい。   As a method for obtaining a moisture permeable waterproof sheet composed of a moisture permeable waterproof layer and a protective layer and a composite method for the covering soil slip-off preventing layer, generally known thermal laminating methods, composite methods using adhesives, and the like can be used. In particular, when the moisture-permeable waterproof layer is formed of a microporous film, a composite method using an adhesive is preferable. When a three-dimensional network is composited, since the fiber density is low, it is difficult to obtain the adhesive strength of the composite using an adhesive. Therefore, the thermocompression bonding method is preferable.

透湿防水シートの透湿度は2000g/m2/24hr以上が好ましい。透湿度が2000g/m2/24hr未満の場合、埋立地内の環境が乾燥側となり状態廃棄物の分解・安定化するまでの期間が長期化する。また有機物分解時に発生するメタンガスなどがキャッピングシートと廃棄物の間にたまるという問題も発生する。 Moisture permeability of moisture-permeable waterproof sheet is more than 2000g / m 2 / 24hr is preferred. If the moisture permeability is less than 2000g / m 2 / 24hr, environment within landfills period until the degradation and stabilize states waste and dry side is prolonged. There is also a problem that methane gas generated during the decomposition of organic matter accumulates between the capping sheet and the waste.

透湿防水シートの耐水圧は50kPa以上が好ましい。耐水圧が50kPa未満の場合、降雨による水の浸入の恐れがあり、廃水処理費用が増大する問題を生じる。耐水圧は高くても問題ないが、耐水圧を高めようとすると透湿性を損なったり、膜が脆くなったりする傾向がある。   The water pressure resistance of the moisture permeable waterproof sheet is preferably 50 kPa or more. When the water pressure resistance is less than 50 kPa, there is a risk of water intrusion due to rain, which causes a problem of increasing wastewater treatment costs. Even if the water pressure is high, there is no problem, but if the water pressure is increased, the moisture permeability tends to be impaired or the film tends to become brittle.

透湿防水シートの引張強さ100N/5cm以上、引き裂き強さは20N以上が好ましい。本発明のキャッピングシートは、覆土をのせたり、その上を人が歩いたりして、負荷がかかるために機械的強度を必要とされる。引張強さが100N/5cm未満、引裂き強さ画20N未満の場合、その負荷に対してシートが破れたりする危険性がある。特に機械的強度の上限はないが、強度を上げるためには繊維量を増やすことになるので、価格的には不利な方向にある。一般的に上限としては2000N/5cm、500N程度と考えられる。   The moisture permeable waterproof sheet preferably has a tensile strength of 100 N / 5 cm or more and a tear strength of 20 N or more. The capping sheet of the present invention is required to have mechanical strength because a load is applied by placing a soil cover or a person walking on it. When the tensile strength is less than 100 N / 5 cm and the tear strength image is less than 20 N, there is a risk that the sheet may be torn against the load. There is no particular upper limit on mechanical strength, but the amount of fibers is increased in order to increase the strength, which is disadvantageous in terms of price. Generally, the upper limit is considered to be about 2000 N / 5 cm and about 500 N.

以下に実施例を用いて本発明を説明するが、これに限定されるものではない。   Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

なお、用いた評価方法は以下の通りである。   The evaluation methods used are as follows.

(厚み)
JIS−L−1906「一般長繊維不織布試験方法」に準拠して測定した。
(Thickness)
It measured based on JIS-L-1906 "General long fiber nonwoven fabric test method".

(繊維密度)
立体網状体重量および厚みより繊維密度を求めた。
(Fiber density)
The fiber density was determined from the weight and thickness of the three-dimensional network.

(透湿度)
JIS−L−1099「繊維製品の透湿度試験方法」(A−1法)塩化カルシウム法に準拠し、φ70mmにより測定した。
(Moisture permeability)
According to JIS-L-1099 “Method of testing moisture permeability of textile products” (Method A-1) calcium chloride method, measurement was performed at φ70 mm.

(耐水圧)
JIS−L−1902「繊維製品の防水性試験方法」耐水度試験(静水圧法)高圧法に準拠し、測定した。
(Water pressure resistance)
Measured according to JIS-L-1902 “Testing method for waterproofness of textile products” water resistance test (hydrostatic pressure method) and high pressure method.

(引張強さ)
JIS−L−1906「一般長繊維不織布試験方法」に準拠して測定した。
(Tensile strength)
It measured based on JIS-L-1906 "General long fiber nonwoven fabric test method".

(引裂き強さ)
JIS−L−1906「一般長繊維不織布試験方法」シングルタング法に準拠して、測定した。
(Tear strength)
Measured in accordance with JIS-L-1906 “General Long Fiber Nonwoven Fabric Test Method” single tongue method.

(覆土滑落防止機能)
土砂滑り角評価装置を使用して、土砂すべりが開始する角度を測定することにより判断した。評価装置は、一対の5cm角棒を仮面長さ側に平行に固着した木板(幅30cm、長さ90cm、厚み1.4cm)を土台とし、土台の上面には両長さ側端部に幅2cmの市販の敷居滑りが固着され、且つ、敷居すべりの間に試料(幅18.5cm、長さ50cm)が貼り付けられた木板(幅25cm、長さ60cm、厚み0.5cm)からなる試料板が配置されたものである。そして、四角筒状の砂升(内側空間の幅19cm、長さ30cm、高さ20cm)が、その下端面を敷居滑りと接触するように配置されたものである。
試験は、水平な場所に試験装置を設置し、試料板を固定した状体で、砂升の内部に槌の含有率が6.3%の造成用土砂(株式会社山富製)を10kg充填し、次に高さ11〜12cmとなるまで土砂を角材で平坦に押し固め、土台の幅側の一端を引き上げることにより行なった。この引き上げのときに砂升が移動開始した角度(土台の傾斜角度)を測定して、これを土砂滑り角とした。なお、敷居滑り表面と砂升の下端面には、グリースを塗布する。
判断基準は、以下の通りである。
○:滑り角度が40°以上
×:滑り角度が40°未満
(Soil cover slip prevention function)
Judgment was made by measuring the angle at which landslide slip started using a landslide slip angle evaluation device. The evaluation device is based on a wooden board (width 30 cm, length 90 cm, thickness 1.4 cm) in which a pair of 5 cm square bars are fixed in parallel to the mask length side, and the width of the upper surface of the base is wide at both ends. A sample consisting of a wooden board (width 25 cm, length 60 cm, thickness 0.5 cm) to which a sample (width 18.5 cm, length 50 cm) is affixed between slid slides, with a 2 cm commercial slidable slide fixed A board is arranged. Then, a rectangular cylindrical sand jar (width of inner space: 19 cm, length: 30 cm, height: 20 cm) is arranged so that its lower end surface comes into contact with the slidable slide.
In the test, a test device was installed in a horizontal place, and the sample plate was fixed. The sand jar was filled with 10 kg of soil for construction (made by Yamatomi Co., Ltd.) with a cocoon content of 6.3%. Then, the earth and sand were flattened with square bars until the height became 11 to 12 cm, and one end on the width side of the foundation was pulled up. The angle (the inclination angle of the foundation) at which the sand jar started moving at the time of this lifting was measured, and this was taken as the earth and sand sliding angle. Grease is applied to the sliding surface of the sill and the bottom surface of the sandbox.
Judgment criteria are as follows.
○: Sliding angle is 40 ° or more ×: Sliding angle is less than 40 °

(実施例1)
熱圧着タイプポリエステルスパンボンド不織布 エクーレ 6A51AD(東洋紡績社製)とポリエチレン多孔質フィルムYP4400(大和川ポリマー社製)を融点120℃の共重合ポリエステル樹脂をカーテンスプレー法で不織布上に塗布して、加熱加圧して一体化する。さらにニードルパンチタイプポリエステルスパンボンド不織布 ボランス 4301NB(東洋紡績社製)と前記の複合品を同様にして一体化する。この3層複合品の熱圧着タイプスパンボンド不織布側に繊維径1mm、厚み10mm、繊維密度80kg/m3の立体網状体を重ねて、加熱ロールにて部分的に熱圧着させ、発明のキャッピングシートを得た。物性を表1に示す。
Example 1
Thermocompression-bonding polyester spunbond nonwoven fabric Ecule 6A51AD (Toyobo Co., Ltd.) and polyethylene porous film YP4400 (Yamatogawa Polymer Co., Ltd.) are coated on the nonwoven fabric by a curtain spray method with a copolymer polyester resin having a melting point of 120 ° C. Press to integrate. Further, the needle punch type polyester spunbonded non-woven fabric Borans 4301NB (manufactured by Toyobo Co., Ltd.) and the composite product are integrated in the same manner. The capping sheet of the invention is obtained by superimposing a three-dimensional network having a fiber diameter of 1 mm, a thickness of 10 mm, and a fiber density of 80 kg / m 3 on the thermocompression-bonded spunbond nonwoven fabric side of the three-layer composite product and partially thermocompression bonding with a heating roll. Got. The physical properties are shown in Table 1.

(実施例2)
透湿防水層として、ペルプレン P−50B(東洋紡社製)樹脂を用いた0.3mmのシートを用いた以外は実施例1と同様にしてキャッピングシートを得た。物性を表1に示す。
(Example 2)
A capping sheet was obtained in the same manner as in Example 1 except that a 0.3 mm sheet using Perprene P-50B (manufactured by Toyobo Co., Ltd.) was used as the moisture permeable waterproof layer. The physical properties are shown in Table 1.

(比較例1)
透湿防水層を除いた以外は、実施例1と同様に複合シートを得た。物性を表1に示す。
(Comparative Example 1)
A composite sheet was obtained in the same manner as in Example 1 except that the moisture-permeable waterproof layer was removed. The physical properties are shown in Table 1.

(比較例2)
立体網状体を除いた以外は、実施例1と同様に複合シートを得た。物性を表1に示す。
(Comparative Example 2)
A composite sheet was obtained in the same manner as in Example 1 except that the three-dimensional network was removed. The physical properties are shown in Table 1.

(比較例3)
立体網状体を繊維径1mm、厚み3mm、繊維密度250kg/m3とした以外は、実施例1と同様に複合シートを得た。物性を表1に示す。
(Comparative Example 3)
A composite sheet was obtained in the same manner as in Example 1 except that the three-dimensional network was changed to a fiber diameter of 1 mm, a thickness of 3 mm, and a fiber density of 250 kg / m 3 . The physical properties are shown in Table 1.

Figure 2007160140
Figure 2007160140

本発明のキャッピングシートは、浸出水がなく、埋立地内部のガス蓄積を低減する、斜面上の覆土の滑落防止機能を保有したシートである。本発明のキャッピングシートを用いた廃棄物処分場のキャッピング工法実施した際には、浸出水の処理費用を軽減でき、そして安全な環境を提供できる。   The capping sheet of the present invention is a sheet that has no leachate and has a function to prevent slippage of the covering soil on the slope, which reduces gas accumulation inside the landfill. When the capping method of the waste disposal site using the capping sheet of the present invention is carried out, the leachate treatment cost can be reduced and a safe environment can be provided.

Claims (7)

透湿防水性層と少なくとも一方を覆う保護層からなる透湿防水シートの保護層側に覆土滑落防止層を有したことを特徴とするキャッピングシート。   A capping sheet comprising a moisture-permeable waterproof layer and a protective layer covering the at least one of the moisture-permeable waterproof sheet, and a protective soil-sliding prevention layer on the protective layer side. 透湿防水層が微多孔膜、無孔透湿シート、メルトブロー不織布、フラッシュ紡糸不織布から選択された部材であることを特徴とする請求項1に記載のキャッピングシート。   The capping sheet according to claim 1, wherein the moisture-permeable waterproof layer is a member selected from a microporous membrane, a non-porous moisture-permeable sheet, a melt blown nonwoven fabric, and a flash spun nonwoven fabric. 保護層が長繊維不織布からなることを特徴とする請求項1又は2に記載のキャッピングシート。   The capping sheet according to claim 1 or 2, wherein the protective layer is made of a long-fiber nonwoven fabric. 滑落防止層が厚さ5mm以上、繊維密度20kg/m3以上200kg/m3以下の立体網状体よりなることを特徴とする請求項1〜3いずれかに記載のキャッピングシート。 The capping sheet according to any one of claims 1 to 3, wherein the anti-skid layer comprises a three-dimensional network having a thickness of 5 mm or more and a fiber density of 20 kg / m 3 or more and 200 kg / m 3 or less. 透湿度が2000g/m2/24hr以上であり、耐水圧が50kPa以上である透湿防水シートを使用することを特徴とする請求項1〜4いずれかに記載のキャッピングシート。 Moisture permeability is not less 2000g / m 2 / 24hr or more, capping sheet according to any one claims 1 to 4 water pressure is characterized by the use of moisture-permeable waterproof sheet is not less than 50 kPa. 引張強さ100N/5cm以上であり、且つ引き裂き強さが20N以上である透湿防水シートを使用することを特徴とする請求項1〜5いずれかに記載のキャッピングシート。   The capping sheet according to any one of claims 1 to 5, wherein a moisture-permeable waterproof sheet having a tensile strength of 100 N / 5 cm or more and a tear strength of 20 N or more is used. 最終処分場のキャッピング工法において、請求項1〜6いずれかに記載のキャッピングシートを立体網状体を表面となるように敷設し、その上に覆土層を形成することを特徴とするキャッピング工法。   A capping method for a final disposal site, wherein a capping sheet according to any one of claims 1 to 6 is laid so that a three-dimensional network is on the surface, and a covering layer is formed thereon.
JP2005356160A 2005-12-09 2005-12-09 Capping sheet for waste disposal site and its capping method of construction Pending JP2007160140A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010155230A (en) * 2008-12-05 2010-07-15 Toyobo Co Ltd Capping sheet for covering waste, and joining method thereof
JP2014210379A (en) * 2013-04-18 2014-11-13 太陽工業株式会社 Laminated sheet, and method for joining laminated sheet
CN105970658A (en) * 2016-07-01 2016-09-28 福建华峰运动用品科技有限公司 Three-layer mesh fabric and flexible shaping treatment method thereof
JP2017144633A (en) * 2016-02-17 2017-08-24 旭・デュポン フラッシュスパン プロダクツ株式会社 Composite sheet
JP2022074856A (en) * 2020-11-05 2022-05-18 一村産業株式会社 Vapor permeable waterproof sheet

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JPH1085695A (en) * 1996-09-13 1998-04-07 Asahi Du Pont Furatsushiyusupan Prod Kk Composite coating material used in waste disposal plant
JP2003176538A (en) * 2001-12-12 2003-06-24 Asahi Kasei Corp Topsoil outflow preventing mat and topsoil outflow preventing construction method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1085695A (en) * 1996-09-13 1998-04-07 Asahi Du Pont Furatsushiyusupan Prod Kk Composite coating material used in waste disposal plant
JP2003176538A (en) * 2001-12-12 2003-06-24 Asahi Kasei Corp Topsoil outflow preventing mat and topsoil outflow preventing construction method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010155230A (en) * 2008-12-05 2010-07-15 Toyobo Co Ltd Capping sheet for covering waste, and joining method thereof
JP2014210379A (en) * 2013-04-18 2014-11-13 太陽工業株式会社 Laminated sheet, and method for joining laminated sheet
JP2017144633A (en) * 2016-02-17 2017-08-24 旭・デュポン フラッシュスパン プロダクツ株式会社 Composite sheet
CN105970658A (en) * 2016-07-01 2016-09-28 福建华峰运动用品科技有限公司 Three-layer mesh fabric and flexible shaping treatment method thereof
CN105970658B (en) * 2016-07-01 2018-07-03 福建华峰运动用品科技有限公司 A kind of three-layer mesh fabric and its flexible sizing treatment method
JP2022074856A (en) * 2020-11-05 2022-05-18 一村産業株式会社 Vapor permeable waterproof sheet

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