JP2015217361A - Permeable columnar underground purification body, construction method thereof and permeable underground purification body - Google Patents

Permeable columnar underground purification body, construction method thereof and permeable underground purification body Download PDF

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JP2015217361A
JP2015217361A JP2014104083A JP2014104083A JP2015217361A JP 2015217361 A JP2015217361 A JP 2015217361A JP 2014104083 A JP2014104083 A JP 2014104083A JP 2014104083 A JP2014104083 A JP 2014104083A JP 2015217361 A JP2015217361 A JP 2015217361A
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columnar
purification body
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JP6335020B2 (en
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雅大 永石
Masahiro Nagaishi
雅大 永石
健一 今給黎
Kenichi Imakire
健一 今給黎
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Fudo Tetra Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a permeable underground columnar purification body capable of preventing contaminated water from diffusing and reaching groundwater, and preventing the contaminated water from being expanded in a wide range, by penetration or passage of rainfall accompanying a contaminant existing in an unsaturated layer.SOLUTION: A permeable columnar underground purification body 11 is installed horizontally or obliquely in an unsaturated layer 51, between a contaminated soil area X existing in the unsaturated layer 51 and groundwater (saturated layer) 52.

Description

本発明は、不飽和層に存在する汚染物質を地下水に流入する前に除去する透過性柱状地中浄化体又は深部に不透水層が存在しない地盤においても汚染地下水を浄化する透過性地中柱状浄化体に関するものである。   The present invention is a permeable columnar underground purification body that removes contaminants existing in the unsaturated layer before flowing into the groundwater or a permeable underground columnar column that purifies contaminated groundwater even in the ground where there is no impermeable layer in the deep part. It is about a purification body.

汚染地下水の敷地外への流出防止対策としては、バリヤー井戸などの揚水施設を付設する方法、あるいは特開２００５−２９６８２４号公報や特開２０１１−２００７５４号公報に記載のような透過性地下水浄化壁を鉛直状に設置する方法が知られている。   As a countermeasure for preventing the outflow of contaminated groundwater, a method of adding a pumping facility such as a barrier well or a permeable groundwater purification wall as described in JP-A-2005-296824 and JP-A-2011-200754 There is known a method of installing the slab vertically.

特開２００５−２９６８２４号公報JP 2005-296824 A 特開２０１１−２００７５４号公報JP 2011-200754 A

しかしながら、前者のバリヤー井戸などの揚水施設を付設する方法は、水処理施設の設置費用やランニングコストが発生するという問題がある。また、後者の透過性地下水浄化壁を鉛直状に設置する方法は、不透水層が底深く存在すると、透過性地下水浄化壁の設置コストが上昇する。また、深部に不透水層が存在しないと機能しない。また、不飽和層には適用できないという問題がある。   However, the former method of attaching a pumping facility such as a barrier well has a problem that the installation cost and running cost of the water treatment facility are generated. Moreover, the latter method of installing the permeable groundwater purification wall vertically increases the installation cost of the permeable groundwater purification wall when the impermeable layer is deeply present. Moreover, it does not function unless there is an impermeable layer in the deep part. Moreover, there is a problem that it cannot be applied to the unsaturated layer.

従って、本発明の目的は、不飽和層に存在する汚染物質が降雨の浸透または通過により、汚染水が深部に拡散し、地下水に到達し広範囲に汚染水が拡大することを防止する透過性地中柱状浄化体、その製造方法又は透過性地中浄化体を提供することにある。また、本発明の他の目的は、不透水層が存在しない地盤であっても、汚染地下水を浄化する透過性地中柱状浄化体を提供することにある。   Accordingly, an object of the present invention is to prevent the pollutant existing in the unsaturated layer from diffusing deeply into the ground due to the permeation or passage of rainfall, reaching the groundwater, and expanding the contaminated water over a wide area. It is in providing a middle columnar purification body, its manufacturing method, or a permeable underground purification body. Another object of the present invention is to provide a permeable underground columnar purification body that purifies contaminated groundwater even in a ground having no impermeable layer.

すなわち、本発明は、上記従来の課題を解決したものであって、不飽和層内であって、且つ不飽和層に存在する汚染土壌領域と地下水の間に、水平状または傾斜状に設置させることを特徴とする透過性柱状地中浄化体を提供するものである。   That is, the present invention solves the above-mentioned conventional problems, and is installed in a horizontal or inclined manner within a unsaturated layer and between a contaminated soil region existing in the unsaturated layer and groundwater. The permeable columnar underground purification body characterized by this is provided.

また、本発明は、飽和層内であって、且つ飽和層に存在する汚染領域又は不飽和層と飽和層に跨る汚染領域から出る汚染地下水の流れを遮断する方向で且つ傾斜状に設置させることを特徴とする透過性柱状地中浄化体を提供するものである。   Further, the present invention is installed in the saturated layer and in an inclined manner so as to block the contaminated groundwater flowing from the contaminated region existing in the saturated layer or from the contaminated region straddling the unsaturated layer and the saturated layer. The permeable columnar underground purification body characterized by the above is provided.

また、本発明は、前記透過性柱状地中浄化体を、間欠的且つ複数列状で、更に千鳥状となるように配置して得られることを特徴とする透過性地中浄化体を提供するものである。   In addition, the present invention provides a permeable underground purification body obtained by arranging the permeable columnar underground purification bodies intermittently in a plurality of rows and further in a staggered manner. Is.

また、本発明は、前記透過性柱状地中浄化体を、汚染水又は汚染地下水の透過率が１００％となるように配置することを特徴とする前記透過性地中浄化体を提供するものである。   In addition, the present invention provides the permeable underground purification body, wherein the permeable columnar underground purification body is disposed so that the transmittance of contaminated water or contaminated groundwater is 100%. is there.

また、本発明は、該汚染土壌領域は、既設構造の直下に存在するものであることを特徴とする前記透過性柱状地中浄化体を提供するものである。   In addition, the present invention provides the permeable columnar subsurface purification body, wherein the contaminated soil region is present immediately below an existing structure.

また、本発明は、前記透過性柱状地中浄化体を施工する方法であって、粒状物、浄化剤及び水を含有する流動化物を、流動状態を保持したまま地盤中に圧入し、地盤中で塑性化させる工程を有することを特徴とする透過性柱状地中浄化体の施工方法を提供するものである。   Further, the present invention is a method for constructing the permeable columnar subsurface purification body, wherein a fluidized material containing particulate matter, a purification agent and water is pressed into the ground while maintaining a fluid state, The construction method of the permeable columnar underground purification body characterized by having the process to plasticize by.

本発明において、不飽和層に形成された浄化体は、不飽和層に存在する汚染物質が降雨の浸透または通過により、汚染水が深部に拡散し、地下水に到達することを事前に防止することができる。また、飽和層に形成された浄化体は、汚染地下水が広範囲に拡大することを防止する。また、不透水層が存在しない地盤であっても、汚染地下水を浄化することができる。   In the present invention, the purifier formed in the unsaturated layer prevents in advance that the pollutant existing in the unsaturated layer diffuses deeply into the ground due to infiltration or passage of rainfall and reaches the groundwater. Can do. Moreover, the purification body formed in the saturated layer prevents the contaminated groundwater from spreading over a wide area. Moreover, even in the ground where there is no impermeable layer, the contaminated groundwater can be purified.

本発明の第１の実施の形態における透過性地中浄化体の概略断面図である。It is a schematic sectional drawing of the permeable underground purification body in the 1st Embodiment of this invention. 本発明の他の実施の形態における透過性地中浄化体の概略断面図である。It is a schematic sectional drawing of the permeable underground purification body in other embodiment of this invention. 図１の透過性柱状地中浄化体の長手方向の端部から見た一部の透過性地中浄化体である。It is a part of permeable underground purification body seen from the edge part of the longitudinal direction of the permeable columnar underground purification body of FIG. 図１の透過性地中浄化体の施工方法を説明する図である。It is a figure explaining the construction method of the permeable underground purification body of FIG. 図２の透過性地中浄化体の施工方法を説明する図である。It is a figure explaining the construction method of the permeable underground purification body of FIG. 本発明の第２の実施の形態における透過性地中浄化体の概略断面図である。It is a schematic sectional drawing of the permeable underground purification body in the 2nd Embodiment of this invention. 従来の地下水汚染を説明する図である。It is a figure explaining the conventional groundwater contamination.

本発明において、透過性地中浄化体（以下、単に「地中浄化体」とも言う。）１０は、多数の透過性柱状地中浄化体（以下、単に「柱状浄化体」とも言う。）１１からなる。従って、柱状浄化体が水平状または傾斜状に設置される場合、地中浄化体も水平状または傾斜状に設置されることになる。次に、本発明の第１の実施の形態における地中浄化体及び柱状浄化体を図１〜図５を参照して説明する。   In the present invention, the permeable underground purification body (hereinafter also simply referred to as “underground purification body”) 10 is a number of permeable columnar underground purification bodies (hereinafter also simply referred to as “columnar purification bodies”) 11. Consists of. Therefore, when the columnar purification body is installed horizontally or inclined, the underground purification body is also installed horizontally or inclined. Next, the underground purification body and the columnar purification body in the 1st Embodiment of this invention are demonstrated with reference to FIGS.

図１に示すように、柱状浄化体１１は、既設構造１の直下の不飽和層５１内であって、且つ不飽和層５１に存在する汚染土壌領域Ｘと地下水（飽和層５２）の間に、水平状に設置させるものである。多数の柱状浄化体１１の集合体である地中浄化体１０は、汚染土壌領域Ｘから流れ出る汚染水ｃを浄化して、浄化水ｄを地下水に流すものである。図１の汚染土壌領域Ｘは、例えば地表の汚染源である既設プラント１から排出される汚染物質が地中に浸み込んだものであるか、あるいは既設プラント１が建設された時点において、既に地中に存在していたものであり、本例では、不飽和層５１内に存在している。また、汚染土壌領域Ｘに流入する水ｂは、例えば降雨ａの浸透によるものであり、汚染される前の状態である。汚染されていない水ｂは、汚染土壌領域Ｘを通過、浸透することで汚染水ｃとなる。本発明の地中浄化体１０が存在しない従来の場合、図７に示すように、汚染水ｃが地下水に拡散してしまう。図７中、符号Ｙは汚染物質を含む地下水である。   As shown in FIG. 1, the columnar purification body 11 is in the unsaturated layer 51 directly under the existing structure 1 and between the contaminated soil region X existing in the unsaturated layer 51 and the groundwater (saturated layer 52). It is to be installed horizontally. The underground purification body 10 that is an aggregate of a large number of columnar purification bodies 11 purifies the contaminated water c flowing out from the contaminated soil region X and allows the purified water d to flow into the groundwater. The contaminated soil region X in FIG. 1 is, for example, the one in which the pollutant discharged from the existing plant 1 that is a source of surface contamination has soaked into the ground or the existing plant 1 has already been constructed. It exists in the unsaturated layer 51 in this example. In addition, the water b flowing into the contaminated soil region X is, for example, due to infiltration of the rain a, and is in a state before being contaminated. Uncontaminated water b becomes contaminated water c by passing through and permeating the contaminated soil region X. In the conventional case where the underground purification body 10 of the present invention does not exist, the contaminated water c is diffused into the groundwater as shown in FIG. In FIG. 7, symbol Y is groundwater containing pollutants.

地中浄化体１０は、柱状浄化体１１を、複数配置したものであり、好ましくは、間欠的且つ複数列状で、更に千鳥状となるように配置したものである。すなわち、図３は柱状浄化体１１の長手方向の端面から見た一部を示すものであり、柱状浄化体１１は、汚染水の流れ方向に、複数列状且つ千鳥状であり、汚染水の流れ方向の直交方向に、間欠的且つ千鳥状である。また、柱状体１０は、汚染水ｃの透過率が１００％となるように多数、配置されている。すなわち、図３に示すように、汚染水ｃ側から浄化水ｄ側を見た場合、柱状浄化体１１間の隙間はゼロである。なお、図３の地中浄化体１０は、その一部を示したものであり、汚染水の流れ方向に４列以上であってもよく、汚染水の流れ方向の直交方向に更に柱状浄化体１１を造成してもよい。そして、地中浄化体１０において、汚染水の流れ方向が厚みとなる。地中浄化体１０は、汚染水を待ち受ける位置にあり、地中に造成するのみで、長期間に亘り、特段の制御は不要である。   The underground purifying body 10 includes a plurality of columnar purifying bodies 11 and is preferably arranged intermittently in a plurality of rows and in a staggered manner. That is, FIG. 3 shows a part of the columnar purification body 11 as viewed from the end face in the longitudinal direction, and the columnar purification body 11 has a plurality of rows and staggered shapes in the direction of the contaminated water flow. It is intermittent and staggered in the direction perpendicular to the flow direction. A large number of columnar bodies 10 are arranged so that the transmittance of the contaminated water c is 100%. That is, as shown in FIG. 3, when the purified water d side is viewed from the contaminated water c side, the gap between the columnar purified bodies 11 is zero. Note that the underground purification body 10 in FIG. 3 shows a part thereof, and there may be four or more rows in the flow direction of the contaminated water, and further a columnar purification body in the direction orthogonal to the flow direction of the contaminated water. 11 may be created. And in the underground purification body 10, the flow direction of contaminated water becomes thickness. The underground purification body 10 is in a position where it waits for polluted water, and is only created in the ground, and no special control is required for a long period of time.

柱状浄化体は、図２に示すようなものであってもよい。図２において、図１と同一構成要素には同一符号を付して、その説明を省略し、異なる点について主に説明する。すなわち、図２において、図１と異なる点は、柱状浄化体１１ａ、１１ｂを傾斜状に造成した点である。すなわち、柱状浄化体１１ａ、１１ｂは、不飽和層５１内であって、且つ不飽和層５１に存在する汚染土壌領域Ｘと地下水（飽和層５２）の間に、汚染水ｃの透過率が１００％となるように、傾斜状に設置させる。傾斜状の柱状浄化体１１ａ、１１ｂは、汚染水を待ち受ける位置にあり、汚染土壌領域Ｘの下方全域を囲んでおり、下方へ浸透する汚染水ｃを浄化する。なお、傾斜状の柱状浄化体１１ａ、１１ｂは、図２に示す形態に限定されず、例えば、柱状浄化体１１ａを省略し、柱状浄化体１１ｂを長く延ばし、汚染土壌領域Ｘの下方全域をカバーするようにしてもよい。また、例えば、柱状浄化体１１ｂを省略し、柱状浄化体１１ａを長く延ばし、汚染土壌領域Ｘの下方全域をカバーするようにしてもよい。地中浄化体１０ａ、１０ｂは、柱状浄化体１１ａ、１１ｂを、間欠的且つ複数列状で、更に千鳥状となるように配置することは、前記地中浄化体１０及び柱状浄化体１１と同様である。   The columnar purifier may be as shown in FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and different points will be mainly described. That is, FIG. 2 is different from FIG. 1 in that the columnar purifiers 11a and 11b are formed in an inclined shape. That is, the columnar purifiers 11a and 11b have a permeability of the contaminated water c of 100 in the unsaturated layer 51 and between the contaminated soil region X existing in the unsaturated layer 51 and the ground water (saturated layer 52). It is installed in an inclined shape so that it becomes%. The inclined columnar purifiers 11a and 11b are in a position waiting for contaminated water, surround the entire area below the contaminated soil region X, and purify the contaminated water c penetrating downward. The inclined columnar purification bodies 11a and 11b are not limited to the form shown in FIG. 2, for example, the columnar purification body 11a is omitted, the columnar purification body 11b is elongated, and the entire area below the contaminated soil region X is covered. You may make it do. Further, for example, the columnar purification body 11b may be omitted, the columnar purification body 11a may be elongated, and the entire area below the contaminated soil region X may be covered. The underground purification bodies 10a and 10b are arranged in a manner that the columnar purification bodies 11a and 11b are intermittently arranged in a plurality of rows and further in a staggered manner, like the underground purification body 10 and the columnar purification bodies 11 It is.

次に、図１の柱状浄化体１１の施工方法について図４を参照して説明する。柱状浄化体１１の施工方法は、粒状物、浄化剤及び水を含有する流動化物を、流動状態を保持したまま地盤中に圧入し、地盤中で塑性化させる工程を有するものである。先ず、当該工程を実施する前に、縦抗２３を造成する工程を行う。縦抗２３は中空管２１を横から水平方向に建て込む際、利用するものであり、汚染領域Ｘの横近傍で、且つ中空管２１を横から水平方向に建て込む作業の空間を確保するのに十分は内径と深さ、例えば、３ｍの内径で数十ｍ長さの鋼管壁である。縦抗２３はボーリング装置等の公知の装置を利用して建て込めばよい。粒状物としては、ポンプで送れるものであれば、特に制限されず、例えば、比較的小粒の砕石等が挙げられる。   Next, the construction method of the columnar purification body 11 of FIG. 1 is demonstrated with reference to FIG. The construction method of the columnar purifier 11 includes a step of press-fitting a fluidized material containing a granular material, a purifying agent and water into the ground while maintaining a fluid state, and plasticizing the fluidized material in the ground. First, before performing the said process, the process of creating the vertical resistance 23 is performed. The vertical resistance 23 is used when the hollow tube 21 is built in the horizontal direction from the side, and secures a space for building the hollow tube 21 in the horizontal direction in the vicinity of the contaminated region X. A steel pipe wall that is tens of meters long with an inner diameter and depth, e.g. The longitudinal 23 may be built using a known device such as a boring device. The granular material is not particularly limited as long as it can be sent by a pump, and examples thereof include relatively small crushed stones.

次いで、縦抗２３の所定の位置から中空管２１を中空管２１の先端が、図４中、符号ｑの位置となるように、横から水平方向に建て込む。次いで、中空管２１を通して、粒状物、浄化剤、水及び必要に応じて流動化剤を含有する流動化物を、流動状態を保持したまま地盤中に圧入し、地盤中で塑性化させ透水性の高い浄化体を得る工程を行う。このような施工方法は、特開２０１０−３１５４０号公報に記載の方法で実施すればよい。このような方法で、所定の長さの柱状浄化体１１が造成され、次いで、同様の施工方法により、別の柱状浄化体１１が次々と造成され、例えば数十本の多数の柱状浄化体１１からなる地中浄化体１０が造成される。柱状浄化体１１は、間欠的且つ複数列状で、更に千鳥状となるように、更に好適には、汚染水の透過率が１００％となるように配置して、地中浄化体１０を造成すればよい。   Next, the hollow tube 21 is built in from the side in the horizontal direction so that the tip of the hollow tube 21 is located at the position q in FIG. Next, a fluidized material containing particulate matter, a purifying agent, water and, if necessary, a fluidizing agent is press-fitted into the ground through the hollow tube 21 and is plasticized in the ground to maintain water permeability. A process for obtaining a highly purified product is performed. Such a construction method may be carried out by the method described in JP 2010-31540 A. By such a method, a columnar purification body 11 having a predetermined length is formed, and then another columnar purification body 11 is formed one after another by a similar construction method. For example, several tens of columnar purification bodies 11 are formed. The underground purification body 10 which consists of is created. The columnar purification bodies 11 are intermittently arranged in a plurality of rows and more preferably in a staggered manner, and more preferably, the polluted water permeability is set to 100% to form the underground purification body 10. do it.

水平状の柱状浄化体１１は、水平ボーリングを使用する他の方法で造成することができる。すなわち、縦抗２３の所定の位置から中空管を中空管の先端が図４中、符号ｑの位置となるように、横から水平方向に建て込む。次いで、中空管の中に水平ボーリング装置を投入し、土壌を掻き出しながら中空管内を空洞にする。次いで、中空管内に、粒状物と浄化剤からなる混合体を入口開口から先端に向けて押し込みながら充填し、これを繰り返し行い、充填完了後、中空管２１を引き抜くことで透水性の高い柱状浄化体１１を得る。次いで、別の柱状浄化体１１が造成され、前記と同様に、多数の柱状浄化体１１からなる地中浄化体１０が次々と造成される。   The horizontal columnar purification body 11 can be formed by another method using horizontal boring. That is, the hollow tube is built from the predetermined position of the longitudinal 23 in the horizontal direction from the side so that the tip of the hollow tube is at the position of the symbol q in FIG. Next, a horizontal boring device is put into the hollow tube, and the inside of the hollow tube is made hollow while scraping the soil. Next, the hollow tube is filled with a mixture of the granular material and the purifier while being pushed from the inlet opening toward the tip, and this is repeated. After the filling is completed, the hollow tube 21 is pulled out to form a column with high water permeability. A purification body 11 is obtained. Next, another columnar purification body 11 is formed, and the underground purification body 10 composed of a large number of columnar purification bodies 11 is successively formed in the same manner as described above.

次に、図２の柱状浄化体１１ａ、１１ｂの施工方法について図５を参照して説明する。傾斜状の柱状浄化体１１ａ、１１ｂの施工方法において、水平状の柱状浄化体１１の施工方法と異なる点について主に説明する。すなわち、傾斜状の柱状浄化体１１ａ、１１ｂは、縦杭を造成することなく、地上から直接、中空管２１を傾斜方向に建て込むことができる。次いで、中空管２１を通して、粒状物、浄化剤、水及び必要に応じて流動化剤を含有する流動化物を、流動状態を保持したまま地盤中に圧入し、地盤中で塑性化させ透水性の高い浄化体を得る工程を行うこと等は水平状の柱状浄化体１１と同様である。また、 傾斜状の柱状浄化体１１ａ、１１ｂは、前記同様、水平ボーリングを使用する方法で造成することができる。   Next, the construction method of the columnar purification bodies 11a and 11b in FIG. 2 will be described with reference to FIG. In the construction method of the inclined columnar purification bodies 11a and 11b, differences from the construction method of the horizontal columnar purification body 11 will be mainly described. That is, the inclined columnar purification bodies 11a and 11b can build the hollow tube 21 in the inclined direction directly from the ground without forming a vertical pile. Next, a fluidized material containing particulate matter, a purifying agent, water and, if necessary, a fluidizing agent is press-fitted into the ground through the hollow tube 21 and is plasticized in the ground to maintain water permeability. The process of obtaining a high purification body is the same as that of the horizontal columnar purification body 11. In addition, the inclined columnar purifiers 11a and 11b can be formed by a method using horizontal boring as described above.

本発明において、汚染物質としては、べンゼン、トルエン、エチルベンゼン、キシレン、ケトン類などを炭化水素化合物；トリクロロエチレン、テトラクロロエチレン、ジクロロエチレンなど有機塩素化合物；各種シアン化物および鉄、ニッケル、銅等各種金属のシアン錯体等のシアン化合物；ガソリン、軽油、灯油、重油、機械油、潤滑油など油脂類が挙げられる。また、浄化剤としては、これら汚染物質を地中で除去する種々の公知の薬剤が使用できる。   In the present invention, the pollutants include hydrocarbons such as benzene, toluene, ethylbenzene, xylene, and ketones; organic chlorine compounds such as trichloroethylene, tetrachloroethylene, and dichloroethylene; various cyanides and cyanogens of various metals such as iron, nickel, and copper. Cyan compounds such as complexes; oils and fats such as gasoline, light oil, kerosene, heavy oil, machine oil, and lubricating oil. Further, as the purifying agent, various known agents that remove these contaminants in the ground can be used.

次に、本発明の第２の実施の形態における地中浄化体及び柱状浄化体を図６を参照して説明する。図６において、図１〜図５と同一の構成要素には同一符号を付して、その説明を省略し、異なる点について主に説明する。すなわち、図６において、図５と異なる点は、汚染領域の位置及び柱状浄化体が設置される位置である。具体的には、図６に示すように、柱状地中浄化体１１ｃ、１１ｄは、既設構造１の直下の飽和層５２内であって、且つ不飽和層５１と飽和層５２に跨る汚染領域Ｘから出る汚染地下水ｃの流れ方向を遮断する方向で且つ傾斜状に設置させる。   Next, the underground purification body and the columnar purification body in the 2nd Embodiment of this invention are demonstrated with reference to FIG. In FIG. 6, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described. That is, FIG. 6 is different from FIG. 5 in the position of the contaminated area and the position where the columnar purifier is installed. Specifically, as shown in FIG. 6, the columnar underground purification bodies 11 c and 11 d are in the saturated layer 52 immediately below the existing structure 1 and the contaminated region X straddling the unsaturated layer 51 and the saturated layer 52. It is installed in a direction that blocks the flow direction of the contaminated groundwater c coming out of it and in an inclined manner.

図６の汚染土壌領域Ｘは、例えば地表の汚染源である既設プラント１から排出される汚染物質が地中に浸み込んだものであり、本例では、不飽和層５１と飽和層５２に跨るように存在している。また、汚染土壌領域Ｘに流入する水ｂは、例えば降雨ａの浸透によるものであり、汚染される前の状態である。汚染土壌領域Ｘを通過した汚染水は、地下水中に流れ出る。   In the contaminated soil region X of FIG. 6, for example, the pollutant discharged from the existing plant 1 which is a contamination source on the surface of the ground is infiltrated into the ground. In this example, the contaminated soil region X straddles the unsaturated layer 51 and the saturated layer 52. Exist. In addition, the water b flowing into the contaminated soil region X is, for example, due to infiltration of the rain a, and is in a state before being contaminated. The contaminated water that has passed through the contaminated soil region X flows into the groundwater.

地中浄化体１０ｃ、１０ｄは、この汚染地下水を浄化するものである。すなわち、地中浄化体１０ｃ、１０ｄは、汚染地下水ｃの流れ方向を遮断する方向で且つ傾斜状に設置させる。汚染地下水ｃの流れ方向は、降雨による浸透と、地下水と、汚染物質濃度拡散の３つの因子から公知の移流拡散解析法により決定できる。図６の符号ｐで示される丸印内の矢印方向は汚染物質濃度拡散による流れｄ１である。そして、傾斜状の地中浄化体１０ｄは、汚染物質の濃度拡散による流れ方向を遮断する方向に造成され、濃度拡散による汚染水を浄化する。また、汚染物質の濃度拡散以外の降雨による浸透と地下水の流れｄ２は、飽和層５２中、右下方向に流れる。そして、傾斜状の地中浄化体１０ｃは、降雨による浸透と地下水の流れｄ２方向を遮断する方向に造成される。汚染水の流れ方向の遮断とは、流れ方向に直角の方向あるいは直角に近い傾斜角である。これにより、浄化効率が高く、低コストの地中浄化体を造成できる。 The underground purification bodies 10c and 10d purify the contaminated groundwater. That is, the underground purification bodies 10c and 10d are installed in an inclined manner so as to block the flow direction of the contaminated groundwater c. The flow direction of the contaminated groundwater c can be determined by a known advection diffusion analysis method from the three factors of infiltration by rainfall, groundwater, and contaminant concentration diffusion. The direction of the arrow in the circle indicated by the symbol p in FIG. 6 is the flow d 1 due to the contaminant concentration diffusion. And the inclined underground purification body 10d is formed in the direction which interrupts | blocks the flow direction by density | concentration diffusion of a pollutant, and purifies the contaminated water by density | concentration diffusion. In addition, infiltration due to rainfall and groundwater flow d 2 other than the concentration diffusion of pollutants flow in the lower right direction in the saturated layer 52. The sloped ground purifier 10c is Construction in a direction to shut off the flow d 2 direction of penetration and groundwater due to rainfall. The blocking of the contaminated water flow direction is an angle of inclination close to or perpendicular to the flow direction. Thereby, purification efficiency is high and a low-cost underground purification body can be constructed.

地中浄化体１０ｃ、１０ｄは、地中浄化体１０と同様に、柱状浄化体１１ｃ、１１ｄを、複数配置したものがあり、好ましくは、間欠的且つ複数列状で、更に千鳥状となるように配置したものである。図６中、地中浄化体１０ｃ、１０ｄは、飽和層５２において、汚染地下水が浄化されるものであれば、その一部（先端部分）が不飽和層５１に延出していてもよい。また、地中浄化体１０ｃは、下端が更に延びて、地中浄化体１０ｄと接続していてもよい。すなわち、飽和層５２において、汚染土壌領域Ｘを取り囲むような傾斜状の地中浄化体であってもよい。地中浄化体１０ｃ、１０ｄは、汚染地下水が広範囲に拡大することを防止する。また、不透水層が存在しない地盤であっても、汚染地下水を浄化することができる。   The underground purification bodies 10c and 10d have a plurality of columnar purification bodies 11c and 11d arranged in the same manner as the underground purification body 10, preferably intermittently in a plurality of rows and further in a staggered pattern. It is arranged in. In FIG. 6, the underground purifiers 10 c and 10 d may partially extend to the unsaturated layer 51 as long as the contaminated groundwater is purified in the saturated layer 52. Moreover, the lower end of the underground purification body 10c may be further extended and connected to the underground purification body 10d. That is, the saturated underground layer 52 may be an inclined underground purification body that surrounds the contaminated soil region X. The underground purification bodies 10c and 10d prevent the contaminated groundwater from spreading over a wide area. Moreover, even in the ground where there is no impermeable layer, the contaminated groundwater can be purified.

柱状浄化体１１ｃ、１１ｄ及び地中浄化体１０ｃ、１０ｄは、前記柱状浄化体１１ａ、１１ｂ及び地中浄化体１０ａ、１０ｂと同様の施工方法で造成すればよい。   The columnar purification bodies 11c and 11d and the underground purification bodies 10c and 10d may be formed by the same construction method as the columnar purification bodies 11a and 11b and the underground purification bodies 10a and 10b.

本発明の柱状浄化体及び地中浄化体は、上記実施の形態例に限定されず、例えば、図６の汚染土壌領域Ｘは、不飽和層と飽和層に跨る領域に限定されず、例えば、飽和層に存在するものであってもよい。この場合においても、柱状浄化体及び地中浄化体の配置位置及び施工方法は、柱状浄化体１１ｃ、１１ｄ及び地中浄化体１０ｃ、１０ｄと同様である。なお、本発明において、透過性とは、汚染水または汚染地下水を透過させるものであり、且つ柱状浄化体や地中浄化体が造成される地盤の透過性よりも高い透過性を示すものを言う。   The columnar purification body and underground purification body of the present invention are not limited to the above embodiment, for example, the contaminated soil region X in FIG. 6 is not limited to the region straddling the unsaturated layer and the saturated layer, for example, It may be present in the saturated layer. Also in this case, the arrangement positions and construction methods of the columnar purification bodies and the underground purification bodies are the same as those of the columnar purification bodies 11c and 11d and the underground purification bodies 10c and 10d. In the present invention, the permeability refers to a substance that is permeable to contaminated water or contaminated groundwater and has a permeability that is higher than the permeability of the ground on which the columnar purification body or the underground purification body is formed. .

本発明によれば、既設プラントから流れ出た汚染物質を地下水に流れ込む直前で浄化できる。また、飽和層に形成された浄化体は、汚染地下水が広範囲に拡大することを防止する。このため、環境保全に貢献できる。   According to the present invention, the pollutant flowing out from the existing plant can be purified immediately before flowing into the groundwater. Moreover, the purification body formed in the saturated layer prevents the contaminated groundwater from spreading over a wide area. For this reason, it can contribute to environmental conservation.

１ 既設プラント
１０、１０ａ〜１０ｄ 透過性地中浄化体
１１、１１ａ〜１１ｄ 透過性柱状地中浄化体
２１ 中空管
２２ 可撓性配管
２３ 縦杭
５１ 不飽和層
５２ 飽和層
Ｘ 汚染土壌領域
Ｙ 汚染地下水
ａ 降雨
ｂ 浸透降雨
ｃ 汚染水
ｄ 浄化水 DESCRIPTION OF SYMBOLS 1 Existing plant 10, 10a-10d Permeable underground purification body 11, 11a-11d Permeable columnar underground purification body 21 Hollow pipe 22 Flexible piping 23 Vertical pile 51 Unsaturated layer 52 Saturated layer X Contaminated soil area Y Contaminated groundwater a Rainfall b Infiltration rain c Contaminated water d Purified water

Claims (6)

不飽和層内であって、且つ不飽和層に存在する汚染土壌領域と地下水の間に、水平状または傾斜状に設置させることを特徴とする透過性柱状地中浄化体。   A permeable columnar subterranean purifier, which is installed in a horizontal or inclined manner within a unsaturated layer and between a contaminated soil region existing in the unsaturated layer and groundwater. 飽和層内であって、且つ飽和層に存在する汚染領域又は不飽和層と飽和層に跨る汚染領域から出る汚染地下水の流れを遮断する方向で且つ傾斜状に設置させることを特徴とする透過性柱状地中浄化体。   Permeability characterized by being installed in an inclined manner in a direction that blocks the flow of contaminated groundwater within the saturated layer and from the contaminated region existing in the saturated layer or from the contaminated region straddling the unsaturated layer and the saturated layer Columnar underground purification body. 請求項１又は２の透過性柱状地中浄化体を、間欠的且つ複数列状で、更に千鳥状となるように配置して得られることを特徴とする透過性地中浄化体。   A permeable underground purification body obtained by disposing the permeable columnar underground purification body according to claim 1 or 2 intermittently in a plurality of rows and further in a staggered pattern. 請求項１又は２の透過性柱状地中浄化体を、汚染水又は汚染地下水の透過率が１００％となるように配置することを特徴とする請求項３記載の透過性地中浄化体。   The permeable underground purification body according to claim 3, wherein the permeable columnar underground purification body according to claim 1 or 2 is disposed so that the transmittance of contaminated water or contaminated groundwater is 100%. 該汚染土壌領域は、既設構造の直下に存在するものであることを特徴とする請求項１記載の透過性柱状地中浄化体。   The permeable columnar subsurface purification body according to claim 1, wherein the contaminated soil region is present immediately below an existing structure. 請求項１又は２の透過性柱状地中浄化体を施工する方法であって、粒状物、浄化剤及び水を含有する流動化物を、流動状態を保持したまま地盤中に圧入し、地盤中で塑性化させる工程を有することを特徴とする透過性柱状地中浄化体の施工方法。   A method for constructing the permeable columnar subsurface purification body according to claim 1 or 2, wherein a fluidized material containing particulate matter, a purification agent and water is pressed into the ground while maintaining a fluid state, A method for constructing a permeable columnar underground purifying body, characterized by comprising a plasticizing step.
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