JP4473763B2 - Containment method for contaminated soil - Google Patents

Containment method for contaminated soil Download PDF

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JP4473763B2
JP4473763B2 JP2005099716A JP2005099716A JP4473763B2 JP 4473763 B2 JP4473763 B2 JP 4473763B2 JP 2005099716 A JP2005099716 A JP 2005099716A JP 2005099716 A JP2005099716 A JP 2005099716A JP 4473763 B2 JP4473763 B2 JP 4473763B2
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steel sheet
sheet pile
soil
concrete
contaminated soil
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JP2006272284A (en
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一司 荒木
裕二 玉田
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Sumitomo Osaka Cement Co Ltd
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W30/30—Landfill technologies aiming to mitigate methane emissions

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Description

本発明は、汚染土壌に含まれる汚染物質が周囲へ拡散するのを防止する汚染土壌の封じ込め方法に関する。   The present invention relates to a method for containing contaminated soil, which prevents the contaminant contained in the contaminated soil from diffusing to the surroundings.

従来より、汚染物質を含む汚染土壌が周囲へ拡散するのを防止するために、汚染土壌を掘削して掘削部を形成し、該掘削部の周囲に沿って鋼矢板からなる止水壁を設けて、再び汚染土壌を該掘削部に埋め戻すことが行われている。
しかし、鋼矢板からなる止水壁は、遮水性、耐久性に優れているものの、鋼矢板を連接するときの継ぎ目部分の施工が不十分であると隙間を有し、そこから汚染物質が拡散するという問題がある。また、周囲に設けた鋼矢板とのシールが困難であるため、前記掘削部の底面には鋼矢板を施工することが難しく、また、底面積が大きくなるほど材料費も増大する。そこで、掘削部の底面への汚染物質の拡散を防止するために、前記掘削部の周囲に設けた鋼矢板を不透水層に達するまで地中深く設けなければならない。 Conventionally, in order to prevent the contaminated soil containing pollutants from diffusing to the surroundings, the contaminated soil is excavated to form an excavated portion, and a water blocking wall made of steel sheet piles is provided along the periphery of the excavated portion. Then, the contaminated soil is backfilled in the excavated portion again.
However, the water barrier made of steel sheet piles is excellent in water barrier and durability, but there is a gap when the construction of the seam part when connecting steel sheet piles is insufficient, and pollutants diffuse from there There is a problem of doing. Moreover, since it is difficult to seal with a steel sheet pile provided around, it is difficult to construct a steel sheet pile on the bottom surface of the excavation part, and the material cost increases as the bottom area increases. Therefore, in order to prevent the diffusion of contaminants to the bottom surface of the excavation part, a steel sheet pile provided around the excavation part must be provided deep in the ground until it reaches the impermeable layer.

また、別の止水壁として、汚染土壌に固化材を含めた改良土やコンクリートにより前記掘削部内周に築造したものがある。これにより掘削部の底面にも容易に止水壁を設けることができる。しかし、前記改良土やコンクリートは、遮水性に優れているものの、ひび割れが生じやすく、舗装面にひびが生じると、そこから汚染物質が拡散するという問題がある。   Another water blocking wall is constructed on the inner periphery of the excavation part with improved soil or concrete containing solidified material in contaminated soil. Thereby, a water stop wall can be easily provided also in the bottom face of an excavation part. However, although the improved soil and concrete are excellent in water shielding, there is a problem that cracks are likely to occur, and if the pavement surface is cracked, contaminants diffuse from there.

さらに、別の止水壁として、前記掘削部の表面に遮水シートを敷設したものがある。この止水壁は、掘削部の形状に関わりなく、容易に掘削部の表面に設けることができ、継ぎ目がなくひび割れも生じないので、遮水性に優れるという利点がある。しかし、遮水シートは、施工が容易で遮水性に優れているものの、上述した鋼矢板や処理土で形成された止水壁に比べて破損しやすいという欠点がある。   Furthermore, there is another water blocking wall in which a water shielding sheet is laid on the surface of the excavation part. Regardless of the shape of the excavation part, this water blocking wall can be easily provided on the surface of the excavation part, and there is no seam and no cracking. However, although the water-impervious sheet is easy to construct and has excellent water-impervious properties, it has a drawback that it is more easily damaged than the water-stop wall formed of the above-mentioned steel sheet pile or treated soil.

このように、汚染物質の拡散を防止するための止水壁として種々の材料を採用することができるが、いずれの材料を用いた場合でも汚染土壌を十分に封じ込めることができないという問題がある。   As described above, various materials can be adopted as the water blocking wall for preventing the diffusion of the pollutant, but there is a problem that the contaminated soil cannot be sufficiently contained even when any material is used.

本発明は、上記問題を鑑みてなされたもので、汚染土壌をより確実に封じ込めることができる汚染土壌の封じ込め方法を提供することを課題とする。   This invention is made | formed in view of the said problem, and makes it a subject to provide the containment method of the contaminated soil which can contain a contaminated soil more reliably.

そこで、本発明に係る汚染土壌の封じ込め方法は、汚染物質によって汚染された汚染土壌を掘削して掘削部を形成し、該掘削部の周囲に沿って第一の鋼矢板を設け、該第一の鋼矢板の内側に該第一の鋼矢板と平行させて第二の鋼矢板を設ける工程と、前記第一の鋼矢板と前記第二の鋼矢板との間に前記改良土又はコンクリートの少なくとも何れか一方を投入し、該改良土又はコンクリートの少なくとも何れか一方が固化した後に、前記第二の鋼矢板を除去し、前記掘削部の底面に前記改良土又はコンクリートの少なくとも何れか一方を投入して固化させる工程によって止水壁を形成し、該止水壁の内側に前記汚染土壌を埋め戻すことを特徴とする。 Therefore, in the method for containing contaminated soil according to the present invention, the contaminated soil contaminated with the pollutant is excavated to form an excavated portion, a first steel sheet pile is provided around the excavated portion, and the first A step of providing a second steel sheet pile in parallel with the first steel sheet pile, and at least the improved soil or concrete between the first steel sheet pile and the second steel sheet pile. After either one of the improved soil or concrete is solidified, the second steel sheet pile is removed and at least one of the improved soil or concrete is added to the bottom surface of the excavation part. Then, a water blocking wall is formed by a solidifying step, and the contaminated soil is backfilled inside the water blocking wall .

上記汚染物質の封じ込め方法によれば、前記止水壁を設ける工程は、前記掘削部の周囲に沿って第一の鋼矢板を設け、該第一の鋼矢板の内側に該第一の鋼矢板と平行させて第二の鋼矢板を設ける工程と、前記第一の鋼矢板と前記第二の鋼矢板との間に前記改良土又はコンクリートの少なくとも何れか一方を投入し、該改良土又はコンクリートの少なくとも何れか一方が固化した後に、前記第二の鋼矢板を除去し、前記掘削部の底面に前記改良土又はコンクリートの少なくとも何れか一方を投入して固化させる工程とを有するため、これにより、たとえ改良土又はコンクリートの少なくとも何れか一方にひびが生じ、そこから汚染物質が拡散しても、前記改良土又はコンクリートの少なくとも何れか一方の外面を覆っている鋼矢板により汚染物質の拡散を防止することができ、汚染土壌をより確実に封じ込めることができる。
なお、前記改良土又はコンクリートの少なくとも何れか一方の表面に遮水シートを敷設する工程をさらに有してもよい。これにより、止水壁が遮水シート、改良土又はコンクリートの少なくとも何れか一方及び鋼矢板の三層構造で覆われているので、それぞれの材料の欠点を補いつつ、より確実に汚染物質の拡散を防止することができる。 According to the method for containing pollutants, the step of providing the water blocking wall includes providing a first steel sheet pile along the periphery of the excavation part, and the first steel sheet pile inside the first steel sheet pile. A second steel sheet pile in parallel with the first steel sheet pile and the second steel sheet pile between at least one of the improved soil or concrete, the improved soil or concrete after at least one solidification of, for a step of the second steel sheet pile is removed, to solidify by introducing at least one of the modified soil or concrete to the bottom of the excavation, thereby Even if at least one of the improved soil and concrete is cracked and the pollutant diffuses from the crack, the steel sheet pile covering the outer surface of at least one of the improved soil and concrete It is possible to prevent the diffusion, it is possible to contain the contaminated soil more reliably.
In addition, you may further have the process of laying a water-impervious sheet on the surface of at least one of the improved soil and concrete. As a result, the water blocking wall is covered with a three-layered structure of at least one of a water shielding sheet, improved soil or concrete, and a steel sheet pile, so that the diffusion of contaminants can be performed more reliably while compensating for the defects of each material. Can be prevented.

さらに、前記掘削部を不透水層に達するまで掘削し、前記止水壁を設ける工程は、前記掘削部の周囲に沿って第一の鋼矢板を設け、該第一の鋼矢板の内側に該第一の鋼矢板と平行させて第二の鋼矢板を設ける工程と、前記第一の鋼矢板と前記第二の鋼矢板との間に前記改良土又はコンクリートの少なくとも何れか一方を投入する工程と、該改良土又はコンクリートの少なくとも何れか一方が固化した後に、前記第二の鋼矢板を除去する工程とを有することが好ましい。これにより、掘削部の底面に止水壁を施工する必要がなく、少ない材料で、より確実に汚染物質の拡散を防止することができる。 Further, the step of excavating the excavation part until it reaches the impermeable layer and providing the water blocking wall includes providing a first steel sheet pile along the periphery of the excavation part, and placing the first steel sheet pile inside the first steel sheet pile A step of providing a second steel sheet pile in parallel with the first steel sheet pile, and a step of introducing at least one of the improved soil or concrete between the first steel sheet pile and the second steel sheet pile And a step of removing the second steel sheet pile after at least one of the improved soil and concrete is solidified. Thereby, it is not necessary to construct a water blocking wall on the bottom surface of the excavation part, and the diffusion of contaminants can be more reliably prevented with a small amount of material.

本発明に係る汚染土壌の封じ込め方法は、汚染土壌を掘削して掘削部を形成し、該掘削部に、前記汚染物質の拡散を防止するべく該掘削部の周囲に沿って第一の鋼矢板を設け、該第一の鋼矢板の内側に該第一の鋼矢板と平行させて第二の鋼矢板を設ける工程と、前記第一の鋼矢板と前記第二の鋼矢板との間に前記改良土又はコンクリートの少なくとも何れか一方を投入し、該改良土又はコンクリートの少なくとも何れか一方が固化した後に、前記第二の鋼矢板を除去し、前記掘削部の底面に前記改良土又はコンクリートの少なくとも何れか一方を投入して固化させる工程によって止水壁を設けるようにしたので、汚染土壌と接する一の止水壁に破損部分が生じ、そこから汚染物質が拡散しても、一の止水壁の外面に形成されている他の止水壁により汚染物質の拡散を防止することができ、汚染土壌をより確実に封じ込めることができる。 The method for containing contaminated soil according to the present invention includes excavating contaminated soil to form an excavated portion, and a first steel sheet pile along the periphery of the excavated portion in the excavated portion to prevent diffusion of the contaminant. Providing a second steel sheet pile in parallel with the first steel sheet pile inside the first steel sheet pile, and between the first steel sheet pile and the second steel sheet pile After at least one of the improved soil or concrete is charged and at least one of the improved soil or concrete is solidified, the second steel sheet pile is removed, and the improved soil or concrete is placed on the bottom surface of the excavation part. Since the water blocking wall was provided by the process of adding at least one of them and solidifying it, even if a damaged part occurs in one water blocking wall in contact with the contaminated soil, Other water blocking walls formed on the outer surface of the water wall It is possible to prevent diffusion of more contaminants can be contained contaminated soil more reliably.

以下、本発明の一実施形態について図面を参酌しつつ説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

＜第一実施形態＞
図１および図２は、本発明の第一実施形態に係る汚染土壌の封じ込め方法を説明するための図である。 <First embodiment>
1 and 2 are views for explaining a method for containing contaminated soil according to the first embodiment of the present invention.

以下に、本実施形態に係る汚染土壌の封じ込め方法について説明する。
まず、土壌１２中の汚染物質によって汚染された汚染土壌１１を掘削し、井戸状の掘削部１０を形成する（図１（ａ））。そして、掘削部１０の周囲に沿って第一の鋼矢板１ａを設け、該第一の鋼矢板１ａと平行させて、第二の鋼矢板１ｂを設ける（図１（ｂ））。そして、前記第一の鋼矢板１ａと前記第二の鋼矢板１ｂとの間に改良土又はコンクリート２の少なくとも何れか一方を投入し（図１（ｃ））、掘削部１０の底面にも改良土又はコンクリート２の少なくとも何れか一方を投入する（図１（ｄ））。最後に、汚染土壌１１を掘削部１０に埋め戻す（図１（ｅ））。なお、汚染土壌１１を埋め戻した上面は改良土又はコンクリートで舗装あるいは盛土を行ってもよい。 Below, the containment method of the contaminated soil which concerns on this embodiment is demonstrated.
First, the contaminated soil 11 contaminated with the pollutant in the soil 12 is excavated to form a well-shaped excavated portion 10 ( FIG. 1A ). And the 1st steel sheet pile 1a is provided along the circumference | surroundings of the excavation part 10, and the 2nd steel sheet pile 1b is provided in parallel with this 1st steel sheet pile 1a ( FIG.1 (b)). And at least any one of improvement soil or concrete 2 is thrown in between said 1st steel sheet pile 1a and said 2nd steel sheet pile 1b (Drawing 1 (c)), and the bottom of excavation part 10 is also improved. At least one of soil and concrete 2 is charged ( FIG. 1 (d)). Finally, the contaminated soil 11 is backfilled in the excavation part 10 ( FIG. 1 (e)). In addition, the upper surface where the contaminated soil 11 is backfilled may be paved or filled with improved soil or concrete.

ここで、鋼矢板としては、Ｕ形鋼矢板、組合せ鋼矢板、直線形鋼矢板又は鋼管矢板など種々のものを採用することができる。   Here, as a steel sheet pile, various things, such as a U-shaped steel sheet pile, a combination steel sheet pile, a linear steel sheet pile, or a steel pipe sheet pile, are employable.

また、改良土とは、例えば、汚染土壌又は汚染されていない土壌のいずれかと、吸着剤又は不溶化剤のいずれかとを混練し、さらに水と固化材とを加えて製造したものである。前記改良土又はコンクリートは、平行させて設けた鋼矢板間に充填できるほどに流動性を有することが好ましい。また、前記改良土は、汚染土壌又は汚染されていない土壌を４０〜８０重量％、吸着剤又は不溶化剤を１〜２０重量％、固化材を５〜４０重量％含有させて製造することができる。   The improved soil is produced by, for example, kneading either contaminated soil or uncontaminated soil with either an adsorbent or an insolubilizer, and further adding water and a solidifying material. The improved soil or concrete preferably has fluidity so that it can be filled between steel sheet piles provided in parallel. The improved soil can be produced by containing 40 to 80% by weight of contaminated soil or uncontaminated soil, 1 to 20% by weight of an adsorbent or insolubilizer, and 5 to 40% by weight of a solidifying material. .

吸着剤としては、ゼオライト、活性炭、ベントナイト等が挙げられる。不溶化剤としては、硫化ナトリウム、硫化カリウム、硫化カルシウム等の硫化物、水流化ナトリウム、水流化カリウム、水流化カルシウム等の水流化物、多硫化ナトリウム、多硫化カリウム、多硫化カルシウム等の多硫化物又はキレート剤等が挙げられる。固化材としては、ポルトランドセメント、高炉セメント、早強セメント等のセメント類、水砕スラグ等のスラグ類、二水石膏、半水石膏及び無水石膏等の石膏類、生石灰、消石灰又は酸化マグネシウム等が挙げられる。   Examples of the adsorbent include zeolite, activated carbon, bentonite and the like. Examples of insolubilizers include sulfides such as sodium sulfide, potassium sulfide, and calcium sulfide; hydrolyzed substances such as sodium hydrosulfide, hydrous potassium, hydrous calcium, and polysulfides such as sodium polysulfide, potassium polysulfide, and calcium polysulfide. Or a chelating agent etc. are mentioned. Examples of solidification materials include Portland cement, blast furnace cement, early-strength cement, slag such as granulated slag, gypsum such as dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum, quick lime, slaked lime, or magnesium oxide. Can be mentioned.

さらに上記のように図１（ａ）〜（ｃ）の工程を経て、改良土又はコンクリート２の少なくとも何れか一方が固化された後に、第二の鋼矢板１ｂを除去する。次に、掘削部１０の底面に改良土又はコンクリート２の少なくとも何れか一方を投入し底面を形成する。 Furthermore , after at least any one of improved soil or concrete 2 is solidified through the steps of FIGS. 1A to 1C as described above , the second steel sheet pile 1b is removed. Next, at least one of the improved soil or the concrete 2 is thrown into the bottom surface of the excavation part 10 to form the bottom surface.

このように、本実施形態に係る汚染土壌の封じ込め方法は、汚染土壌１１と接する方向から順に、改良土又はコンクリート２の少なくとも何れか一方及び鋼矢板１の二層構造の止水壁を設けるようにした。これにより、例えば改良土又はコンクリート２の少なくとも何れか一方にひびが生じ、そこから汚染物質が拡散しても、改良土又はコンクリート２の少なくとも何れか一方の外面を覆っている鋼矢板１により汚染土壌１１の拡散を防止することができる。また、改良土又はコンクリート２の少なくとも何れか一方に鋼矢板１を隣接させて設けているので、改良土又はコンクリート２の少なくとも何れか一方が鋼矢板１に拘束されて、改良土又はコンクリート２の少なくとも何れか一方の破壊や、ひび割れの発生を防止することができる。   As described above, in the method for containing contaminated soil according to the present embodiment, at least one of the improved soil or the concrete 2 and the two-layered water stop wall of the steel sheet pile 1 are provided in order from the direction in contact with the contaminated soil 11. I made it. Thereby, for example, even if at least one of the improved soil or the concrete 2 is cracked and the pollutant is diffused therefrom, the steel sheet pile 1 covering the outer surface of at least one of the improved soil or the concrete 2 is contaminated. The diffusion of the soil 11 can be prevented. Moreover, since the steel sheet pile 1 is provided adjacent to at least one of the improved soil or the concrete 2, at least one of the improved soil or the concrete 2 is restrained by the steel sheet pile 1, and the improved soil or the concrete 2 At least one of the breakage and cracking can be prevented.

＜第二実施形態＞
図３は、本発明の第二実施形態に係る汚染土壌の封じ込め方法を構成する止水壁の断面図である。 < Second embodiment>
FIG. 3 is a cross-sectional view of a water blocking wall constituting the method for containing contaminated soil according to the second embodiment of the present invention.

以下に本実施形態に係る汚染土壌の封じ込め方法について、図３及び図２を参照して説明する。
上記図２に示す改良土又はコンクリート２の少なくとも何れか一方の表面及び土壌１２の上面部分の一部にわたって遮水シート３を敷設し、汚染土壌１１を埋め戻して、遮水シート３を固定する。 Hereinafter, a method for containing contaminated soil according to the present embodiment will be described with reference to FIGS. 3 and 2.
The water-impervious sheet 3 is laid over the surface of at least one of the improved soil or concrete 2 shown in FIG. 2 and a part of the upper surface portion of the soil 12, the contaminated soil 11 is backfilled, and the water-impervious sheet 3 is fixed. .

ここで遮水シート３は、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリアミド、塩化ビニル樹脂、アクリル樹脂、ポリウレタン、アスファルト系遮水シート、ベントナイト系遮水シート、加硫ゴム、塩化ビニル又は酢酸ビニル共重合体などの材料を一種またはそれ以上のものから作製することができる。
また、遮水シートの厚みは、材質に応じて種々設定すればよく、特に限定されるものではないが、柔軟性、耐久性の観点から、１．５ｍｍ以上のものを使用することができる。 Here, the water shielding sheet 3 is polyethylene, polypropylene, polyethylene terephthalate, polyamide, vinyl chloride resin, acrylic resin, polyurethane, asphalt water shielding sheet, bentonite water shielding sheet, vulcanized rubber, vinyl chloride or vinyl acetate copolymer. Can be made from one or more materials.
Moreover, what is necessary is just to set variously the thickness of a water-impervious sheet according to a material, and although it does not specifically limit, a 1.5 mm or more thing can be used from a softness | flexibility and a durable viewpoint.

このように、本実施形態にかかる汚染土壌の封じ込め方法は、汚染土壌１１と接する方向から順に、遮水シート３，改良土又はコンクリート２の少なくとも何れか一方，及び鋼矢板１の三層構造の止水壁を設けるようにした。これにより、例えば遮水シート３が破損し、そこから汚染物質が拡散しても、遮水シート３の外面をさらに改良土又はコンクリート２の少なくとも何れか一方で覆っているので、汚染物質の拡散を防止することができる。さらに、例えば改良土又はコンクリート２の少なくとも何れか一方にひびが生じ、そこから汚染物質が拡散しても、改良土又はコンクリート２の少なくとも何れか一方の外面を覆っている鋼矢板１により、汚染物質の拡散を防止することができる。また、改良土又はコンクリート２の少なくとも何れか一方に隣接させて、鋼矢板１及び遮水シート３を設けているので、改良土又はコンクリート２の少なくとも何れか一方が鋼矢板１及び遮水シート３に拘束されて、改良土又はコンクリート２の少なくとも何れか一方の破壊や、ひび割れの発生を防止することができる。   As described above, the contaminated soil containment method according to the present embodiment has a three-layer structure of the water shielding sheet 3, the improved soil or the concrete 2, and the steel sheet pile 1 in order from the direction in contact with the contaminated soil 11. A water blocking wall was provided. Thereby, for example, even if the water shielding sheet 3 is broken and the pollutant is diffused therefrom, the outer surface of the water shielding sheet 3 is further covered with at least one of the improved soil and the concrete 2, so that the diffusion of the pollutant Can be prevented. Furthermore, even if, for example, cracks occur in at least one of the improved soil or the concrete 2 and the pollutant diffuses therefrom, the steel sheet pile 1 covering the outer surface of at least one of the improved soil or the concrete 2 causes the contamination. The diffusion of the substance can be prevented. Moreover, since the steel sheet pile 1 and the water shielding sheet 3 are provided adjacent to at least one of the improved soil or the concrete 2, at least one of the improved soil or the concrete 2 is the steel sheet pile 1 and the water shielding sheet 3. Therefore, it is possible to prevent breakage of at least one of the improved soil and the concrete 2 and the occurrence of cracks.

尚、上記第一及び第二実施形態では、鋼矢板を設けるために汚染土壌を地面に対して垂直に掘削したが、本発明の第四実施形態によれば、鋼矢板を設けないで、土壌１２上に直接、改良土又はコンクリート２の少なくとも何れか一方を形成するようにしたので、改良土又はコンクリート２の少なくとも何れか一方が底面に流れ込まない程度に汚染土壌１１を斜め下向きに掘削することが好ましい。例えば、地面に対しおよそ３０度の角度で掘削することができる。また、改良土又はコンクリート２の少なくとも何れか一方は土壌１２上に打設する以外にも、汚染土壌１１を掘削した後に、土壌１２表面上で、固化材、土壌等の材料を配合して練り混ぜてもよい。   In the first and second embodiments, the contaminated soil is excavated perpendicularly to the ground in order to provide the steel sheet pile, but according to the fourth embodiment of the present invention, the soil is not provided without the steel sheet pile. Since at least one of the improved soil or the concrete 2 is formed directly on the soil 12, the contaminated soil 11 is excavated obliquely downward to the extent that at least one of the improved soil or the concrete 2 does not flow into the bottom surface. Is preferred. For example, it can be excavated at an angle of about 30 degrees with respect to the ground. In addition to placing the improved soil or the concrete 2 on the soil 12, after excavating the contaminated soil 11, the surface of the soil 12 is mixed with a material such as a solidified material or soil and kneaded. May be mixed.

＜第三実施形態＞
図４は、本発明の第三実施形態に係る汚染土壌の封じ込め方法を構成する止水壁の断面図である。 < Third embodiment>
FIG. 4 is a cross-sectional view of a water blocking wall constituting the method for containing contaminated soil according to the third embodiment of the present invention.

以下に、本実施形態に係る汚染土壌の封じ込め方法について、図４５及び図１を参照して説明する。
まず、図１（ａ）の工程において、掘削部１０を不透水層１３に達するまで掘削する。そして、掘削部１０の周囲に設けた前記第一の鋼矢板１ａと前記第二の鋼矢板１ｂとの間に改良土又はコンクリート２の少なくとも何れか一方を投入する。そして、第二の鋼矢板１ｂを除去し、汚染土壌１１を埋め戻す。 Hereinafter, the containment method for contaminated soil according to the present embodiment will be described with reference to FIGS. 4 5 and FIG.
First, in the process of FIG. 1A, the excavation part 10 is excavated until it reaches the impermeable layer 13. Then, at least one of the improved soil and the concrete 2 is introduced between the first steel sheet pile 1a and the second steel sheet pile 1b provided around the excavation part 10. Then, the second steel sheet pile 1b is removed, and the contaminated soil 11 is backfilled.

このように、本実施形態に係る汚染土壌の封じ込め方法は、上述した第一乃至第四実施形態に記載された止水壁と異なり、掘削部の底面が不透水層１３により形成されている。つまり、底面に止水壁を施工する必要がなく、少ない材料で汚染物質の拡散を防止することができる。また、改良土又はコンクリート２の少なくとも何れか一方に鋼矢板１を隣接させて設けているので、改良土又はコンクリート２の少なくとも何れか一方が鋼矢板１に拘束されて、改良土又はコンクリート２の少なくとも何れか一方の破壊や、ひび割れの発生を防止することができる。   Thus, unlike the water blocking walls described in the first to fourth embodiments described above, the bottom surface of the excavation part is formed by the impermeable layer 13 in the contaminated soil containment method according to the present embodiment. That is, it is not necessary to construct a water blocking wall on the bottom surface, and the diffusion of contaminants can be prevented with a small amount of material. Moreover, since the steel sheet pile 1 is provided adjacent to at least one of the improved soil or the concrete 2, at least one of the improved soil or the concrete 2 is restrained by the steel sheet pile 1, and the improved soil or the concrete 2 At least one of the breakage and cracking can be prevented.

本発明の第一実施形態に係る汚染土壌の拡散防止方法を説明するための図を示す。The figure for demonstrating the spreading | diffusion prevention method of the contaminated soil which concerns on 1st embodiment of this invention is shown. 本発明の第一実施形態に汚染物質の拡散を防止方法を構成する止水壁の断面図（ａ）及び平面図（ｂ）を示す。Sectional drawing (a) and a top view (b) of the water stop wall which comprise the diffusion prevention method in the 1st embodiment of this invention are shown. 本発明の第二実施形態に係る汚染物質の拡散防止方法を構成する止水壁の断面図を示す。Sectional drawing of the water stop wall which comprises the diffusion prevention method of the pollutant which concerns on 2nd embodiment of this invention is shown. 本発明の第三五実施形態に係る汚染物質の拡散防止方法を構成する止水壁の断面図を示す。Sectional drawing of the water stop wall which comprises the diffusion prevention method of the pollutant which concerns on 3rd 5th embodiment of this invention is shown.

１…鋼矢板
２…改良土、コンクリート、
３…遮水シート
１０…掘削部
１１…汚染土壌
１２…土壌
１３…不透水層 1 ... Steel sheet pile 2 ... Improved soil, concrete,
3 ... Impermeable sheet 10 ... excavation part 11 ... contaminated soil 12 ... soil 13 ... impervious layer

Claims (3)

汚染物質によって汚染された汚染土壌を掘削して掘削部を形成し、該掘削部の周囲に沿って第一の鋼矢板を設け、該第一の鋼矢板の内側に該第一の鋼矢板と平行させて第二の鋼矢板を設ける工程と、前記第一の鋼矢板と前記第二の鋼矢板との間に前記改良土又はコンクリートの少なくとも何れか一方を投入し、該改良土又はコンクリートの少なくとも何れか一方が固化した後に、前記第二の鋼矢板を除去し、前記掘削部の底面に前記改良土又はコンクリートの少なくとも何れか一方を投入して固化させる工程によって止水壁を形成し、該止水壁の内側に前記汚染土壌を埋め戻すことを特徴とする汚染土壌の封じ込め方法。 Excavating the contaminated soil contaminated with the pollutant to form an excavation part, providing a first steel sheet pile along the periphery of the excavation part, and the first steel sheet pile inside the first steel sheet pile A step of providing a second steel sheet pile in parallel, and at least one of the improved soil or concrete is introduced between the first steel sheet pile and the second steel sheet pile, After at least one of them is solidified, the second steel sheet pile is removed, and a water blocking wall is formed by a step of adding and solidifying at least one of the improved soil or concrete to the bottom surface of the excavation part, A method for containing contaminated soil, wherein the contaminated soil is backfilled inside the water blocking wall. 前記改良土又はコンクリートの少なくとも何れか一方の表面に遮水シートを敷設する工程をさらに有することを特徴とする請求項１に記載の汚染土壌の封じ込め方法。   The method for containing contaminated soil according to claim 1, further comprising a step of laying a water-proof sheet on the surface of at least one of the improved soil and concrete. 汚染物質によって汚染された汚染土壌を掘削して掘削部を形成し、該掘削部に前記汚染物質の拡散を防止するべく鋼矢板と、固化材を含む改良土又はコンクリートの少なくとも何れか一方とを積層させて構成した止水壁を設け、前記止水壁の内側に前記汚染土壌を埋め戻す汚染土壌の封じ込め方法において、
前記掘削部を不透水層に達するまで掘削し、前記止水壁を設ける工程は、前記掘削部の周囲に沿って第一の鋼矢板を設け、該第一の鋼矢板の内側に該第一の鋼矢板と平行させて第二の鋼矢板を設ける工程と、前記第一の鋼矢板と前記第二の鋼矢板との間に前記改良土又はコンクリートの少なくとも何れか一方を投入する工程と、該改良土又はコンクリートの少なくとも何れか一方が固化した後に、前記第二の鋼矢板を除去する工程とを有することを特徴とする汚染土壌の封じ込め方法。 Excavating the contaminated soil contaminated by the pollutant to form an excavated part, and to prevent the diffusion of the pollutant in the excavated part, steel sheet pile and at least one of improved soil or concrete containing a solidifying material In a method for containing contaminated soil, a water blocking wall configured by stacking is provided, and the contaminated soil is backfilled inside the water blocking wall.
The step of excavating the excavated portion until it reaches the impermeable layer and providing the water blocking wall includes providing a first steel sheet pile along the periphery of the excavated portion, and placing the first steel sheet pile inside the first steel sheet pile . Providing a second steel sheet pile in parallel with the steel sheet pile, and introducing at least one of the improved soil or concrete between the first steel sheet pile and the second steel sheet pile, And a step of removing the second steel sheet pile after at least one of the improved soil and concrete is solidified.
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