JP4375000B2 - In-situ water purification method for contaminated soil - Google Patents

In-situ water purification method for contaminated soil Download PDF

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JP4375000B2
JP4375000B2 JP2003402043A JP2003402043A JP4375000B2 JP 4375000 B2 JP4375000 B2 JP 4375000B2 JP 2003402043 A JP2003402043 A JP 2003402043A JP 2003402043 A JP2003402043 A JP 2003402043A JP 4375000 B2 JP4375000 B2 JP 4375000B2
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久則 檜垣
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Obayashi Corp
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この発明は、汚染土壌を原位置で浄化する原位置通水浄化工法にかかわり、特に、工期の短縮化とコストの低減化とを図れるようにした技術に関する。   The present invention relates to an in-situ water purification method for purifying contaminated soil in-situ, and more particularly to a technique capable of shortening a construction period and reducing costs.

近年、人間生活に関わる環境問題が大きくクローズアップされている。特に、地盤環境については、油類、有機塩素化合物、重金属、硝酸性窒素などによる汚染が各地で報告されている。実際、工場跡地やクリーニング店の跡地等では、地質中の特定部位の汚染が知られている。これらの汚染物質は、地下水の流れなどによって広範囲に広がるため、早急な対策が必要となる。また、汚染が広がらなくても、跡地を利用するためには、汚染除去の必要がある。   In recent years, environmental problems related to human life have been greatly highlighted. In particular, regarding the ground environment, pollution by oils, organochlorine compounds, heavy metals, nitrate nitrogen, etc. has been reported in various places. In fact, contamination of specific parts of the geology is known at the site of a factory or the site of a cleaning shop. Since these pollutants spread over a wide area due to the flow of groundwater, etc., immediate countermeasures are required. Even if the contamination does not spread, it is necessary to remove the contamination in order to use the site.

このような場合において、地盤中の汚染物質を取り除く工法として、原位置通水浄化工法が用いられる。この工法は、汚染土壌を挟むように揚水井戸と注水井戸とを設け、注水井戸から注入した水を揚水井戸から汲み上げることにより、それらの井戸の間で汚染領域を含む地盤中に水流を発生させ、その水中に融解した有機塩素化合物や重金属などの汚染物質を地上の設備にて浄化するものである。   In such a case, the in-situ water purification method is used as a method for removing contaminants in the ground. In this construction method, a pumping well and a water injection well are provided so as to sandwich the contaminated soil, and water injected from the water injection well is pumped from the pumping well to generate a water flow in the ground including the contaminated area between the wells. In this facility, pollutants such as organochlorine compounds and heavy metals melted in the water are purified by ground facilities.

この原位置通水浄化工法について、より具体的に説明すると、図３の平面図、図４の縦断面図、及び図５の浄化処理システムの概略図に示すようになっている。即ち、汚染された土壌層Ａを含む地盤の浄化対象領域は、その周囲が遮蔽壁２で矩形に囲繞されてその外周部から隔離される。そして、そのいずれか一方の対向する遮蔽壁２ａに沿って、当該遮蔽壁２ａの全長に亘って延びる注水井戸４と揚水井戸６とが交互に平行に配置される。これらの注水井戸４と揚水井戸６とは、それぞれ掘削された溝８内に砕石１０や硅砂等を埋め戻して通水性壁１２として構成されている。この図示例では、砕石による通水性壁１２に形成されており、浄化対象領域の汚染土壌層Ａに対して、左右の両側部と中央部との３ヶ所に注水井戸４が配置され、これらの３つの注水井戸４の中間部に位置して２ヶ所に揚水井戸６が配置されている。   More specifically, the in-situ water purification method is shown in the plan view of FIG. 3, the longitudinal sectional view of FIG. 4, and the schematic diagram of the purification treatment system of FIG. That is, the purification target region of the ground including the contaminated soil layer A is surrounded by the shielding wall 2 in a rectangular shape and isolated from the outer periphery. And the water injection well 4 and the pumping well 6 which extend over the full length of the said shielding wall 2a are alternately arrange | positioned in parallel along the shielding wall 2a of which one of them opposes. Each of the water injection well 4 and the pumping well 6 is configured as a water-permeable wall 12 by backfilling crushed stone 10 or dredged sand into the excavated groove 8. In this example of illustration, it is formed in the water-permeable wall 12 by the crushed stone, The water injection well 4 is arrange | positioned with respect to the contaminated soil layer A of the purification | cleaning object area | region in three places, both right and left sides, and a center part, Pumping wells 6 are arranged at two locations in the middle of the three water injection wells 4.

上記遮蔽壁２には土留鋼矢板等が用いられ、その下端部は、浄化対象とする汚染土壌層Ａの直下にあるシルト層などの透水性の低い粘土質層Ｃよりも更に下層に位置している同じくシルト層などでなる粘土質層まで打ち込まれて設けられる。つまり、汚染土壌層Ａを含んだ浄化対象領域内への外部からの地下水流の流入を阻止するとともに、当該浄化対象領域内の水分が外部に流出するのを阻止するようになっている。   The shield wall 2 is made of earth retaining steel sheet pile, etc., and its lower end is located in a lower layer than a low water-permeable clayey layer C such as a silt layer directly under the contaminated soil layer A to be purified. Also provided is a clay layer made up of silt layer and so on. That is, inflow of the groundwater flow from the outside into the purification target area including the contaminated soil layer A is prevented, and moisture in the purification target area is prevented from flowing out to the outside.

一方、上記注水井戸４と揚水井戸６とはその各下端が、浄化対象の汚染土壌層Ａの直下の粘土質層Ｃまで掘られて形成されている。そして、これらの注水井戸４と揚水井戸６とには砕石１０が埋め戻されて充填される。また、揚水井戸６には塩化ビニール製の有孔管などからなる多孔質管１４が適宜の間隔で挿入される。   On the other hand, each of the water injection well 4 and the pumping well 6 is formed by digging up the clayey layer C immediately below the contaminated soil layer A to be purified. The crushed stone 10 is backfilled and filled in the water injection well 4 and the pumping well 6. A porous tube 14 made of a vinyl chloride perforated tube or the like is inserted into the pumping well 6 at an appropriate interval.

そして、図５に示すように、各注水井戸４には調整槽１８から給水管２０を通じて浄化水が供給される一方、揚水井戸６の各多孔質管１４内には揚水ポンプ付の揚水配管２２が挿入されて内部に貯まった水を原水槽２４に送るようになっている。この原水槽２４と上記調整槽１８とは処理槽２６を介して繋がれており、原水槽２４に揚水された汚染物質を含有した汚染水は、処理槽２６を通過されて汚染物質の除去が行われ、浄水とされて再び調整槽１８に送られて注水井戸４に供給されるようになっている。即ち、注水井戸４に供給された浄水は汚染土壌層Ａに流れ込み、その汚染物質を洗い流しながら揚水井戸４内に流出し、この揚水井戸４に貯まった汚染物質を含んだ汚染水は原水槽２４に回収された後、処理槽２６にて浄化されて循環再利用されるようになっている。   Then, as shown in FIG. 5, purified water is supplied to each water injection well 4 from a regulating tank 18 through a water supply pipe 20, while a pumping pipe 22 with a pump is provided in each porous pipe 14 of the pumping well 6. Is inserted and the water stored inside is sent to the raw water tank 24. The raw water tank 24 and the adjustment tank 18 are connected via a treatment tank 26, and the contaminated water containing the pollutant pumped into the raw water tank 24 is passed through the treatment tank 26 to remove the contaminants. The water is purified, sent to the adjustment tank 18 again, and supplied to the water injection well 4. That is, the purified water supplied to the water injection well 4 flows into the contaminated soil layer A and flows out into the pumping well 4 while washing away the pollutants. After being collected, the water is purified in the treatment tank 26 and recycled.

ところで、上記注水井戸４と揚水井戸６とを施工するにあたり、従来では、図６（ａ）の平面図と（ｂ）の縦断面図、及び図３とに示すように、以下の手順で行っていた。
（１）注・揚水井戸４，６の掘削形成幅に合わせて一対の土留鋼矢板３０を打設する。
（２）鋼矢板３０に挟まれた部分の土を掘削する。
（３）掘削の進捗に応じて、鋼矢板３０，３０間に腹起し材３１を介してジャッキ３２を取り付けた土留支保工３３を架設する。
（４）上記（２）〜（３）を繰り返して所定の深度まで溝状に掘削する。
（５）掘削の完了した掘削溝８に砕石１０を投入充填して埋め戻し、通水性壁１２を形成する。
（６）砕石１０の埋め戻しの進捗に応じて、土留支保工３３を撤去する。
（７）原地盤の高さまで埋め戻して、通水性壁１２の形成が完了した後に、鋼矢板３０を引き抜く。
特開２００３−１６４８４４号公報 特開平１１−９０４１０号公報 By the way, in constructing the water injection well 4 and the pumping well 6, conventionally, as shown in the plan view of FIG. 6A, the longitudinal sectional view of FIG. It was.
(1) A pair of earth retaining steel sheet piles 30 is driven according to the excavation formation width of the pouring and pumping wells 4 and 6.
(2) Excavating the soil between the steel sheet piles 30.
(3) Depending on the progress of excavation, a retaining ring support 33 having a jack 32 attached between the steel sheet piles 30 and 30 with a jack 31 interposed is installed.
(4) The above (2) to (3) are repeated and excavated into a groove shape to a predetermined depth.
(5) The crushed stone 10 is charged and filled in the excavation groove 8 where excavation is completed, and the water-permeable wall 12 is formed.
(6) The earth retaining support 33 is removed according to the progress of backfilling the crushed stone 10.
(7) Backfill to the height of the original ground, and after the formation of the water-permeable wall 12 is completed, the steel sheet pile 30 is pulled out.
JP 2003-164844 A Japanese Patent Laid-Open No. 11-90410

しかしながら、上記従来の注・揚水井戸の施工方法にあっては、次のａ〜ｃに示す様な問題点があった。
ａ．土留鋼矢板３０の打設工程から引き抜き工程までの作業手順が煩雑なため、施工に時間を要した。
ｂ．鋼矢板３０や土留支保工３３の施工費や材料費が高く、高コストであった。
ｃ．一対の土留鋼矢板３０，３０間の掘削幅が狭く狭隘な空間となるので、また土留支保工３３等もあるため、掘削機による掘削が行い難く、このため掘削作業や土留支保工の設置や撤去作業は、人力施工に頼る部分が多かった。これ故、作業効率が悪く、高コストであった。 However, the conventional pouring / pumping well construction method has the following problems a to c.
a. Since the work procedure from the placing process of the earth retaining steel sheet pile 30 to the drawing process is complicated, time is required for the construction.
b. The construction cost and material cost of the steel sheet pile 30 and the earth retaining support 33 were high and the cost was high.
c. Because the excavation width between the pair of earth retaining steel sheet piles 30 and 30 is narrow and narrow, and there is also the earth retaining support 33 and the like, it is difficult to perform excavation with an excavator. The removal work relied heavily on human construction. Therefore, the work efficiency is poor and the cost is high.

本発明は、このような事情に鑑みてなされたものであり、その目的は、作業手順が簡単で、工期の短縮化・低コスト化が図れる汚染土壌の原位置通水浄化工法を提供することにある。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide an in-situ water purification method for contaminated soil that has a simple work procedure and can shorten the construction period and reduce costs. It is in.

本発明は上記の目的を達成するために、汚染土壌の原位置通水浄化工法を以下のように構成する。   In order to achieve the above object, the present invention comprises an in-situ water purification method for contaminated soil as follows.

請求項１に係る発明では、地盤中の汚染土壌を挟んで、共に砕石等で通水性の壁状に形成した揚水井戸と注水井戸とを設け、前記注水井戸から地盤に注入した水を、前記汚染土壌を通過させた後に揚水井戸から汲み上げるようにした汚染土壌の原位置通水浄化工法であって、前記壁状の注水井戸と揚水井戸とを、円筒状のケーシングを所定の深度まで圧入しながら掘削した後に、原地盤の高さまで砕石等で埋め戻してから、前記円筒状ケーシングを引き抜いて円柱状の通水性の柱を形成する通水性柱形成工程と、形成済みの通水性の柱にラップさせて前記通水性柱形成工程を行うことで連続した通水性の壁に形成していく通水性壁形成工程との、２つの形成工程を経て形成し、前記通水性柱形成工程では、前記円筒ケーシングの直径よりも大きく、かつ該直径の２倍よりも小さいピッチ間隔で通水性柱を相互に離間させて形成した後、該離間して隣接する２つの通水性柱にそれぞれ均等にラップさせて、前記通水性壁形成工程を行って連続した通水性壁を形成することを特徴とする。 In the invention according to claim 1, provided with a pumping well and a water injection well both formed in a water-permeable wall shape with crushed stone, etc. across the contaminated soil in the ground, the water injected into the ground from the water injection well, An in-situ water purification method for contaminated soil that is pumped from a pumped well after passing through the contaminated soil, wherein the wall-shaped water injection well and the pumped well are pressed into a cylindrical casing to a predetermined depth. After excavating, after filling back to the height of the original ground with crushed stone etc., pull out the cylindrical casing to form a cylindrical water-permeable column, and to the formed water-permeable column Formed through two forming steps, a water-permeable wall forming step that forms a continuous water-permeable wall by wrapping and performing the water-permeable column forming step, and in the water-permeable column forming step, Larger than the diameter of the cylindrical casing And the water-permeable columns are spaced apart from each other at a pitch interval smaller than twice the diameter, and then uniformly wrapped with the two adjacent water-permeable columns spaced apart from each other. A continuous water-permeable wall is formed by performing a forming step .

請求項１に示す汚染土壌の原位置通水浄化工法の発明によれば、砕石や硅砂等によって共に通水性の壁として構成される注水井戸と揚水井戸とを施工するにあたって、円筒状のケーシングを圧入してその内部を掘削し、所定深さまで掘削した掘削孔内に砕石や硅砂等を投入して埋め戻した後、ケーシングを引き抜いて砕石や硅砂などからなる通水性の柱を形成するという通水性柱形成工程の一連の作業を基本施工作業となして、この基本施工作業となる通水性柱形成工程を繰り返し行って多数の通水性柱を形成する。このとき、通水性柱は１つ飛びに形成して、相互に離間した通水性柱を形成し、爾後、該離間して隣接する２つの通水性柱にそれぞれ均等にラップさせて、前記通水性壁形成工程を行って連続した通水性壁を形成する。つまり、通水性柱をラップさせて連続した通水性壁に構成するにあたって、先ず通水性柱を１つ飛びに形成し、その後、隣接する左右の通水性柱に両側部がラップする通水性柱を形成して連続した通水性壁に形成していくので、円筒ケーシングの圧入時の地盤からの反力を左右対称となし得、当該圧入時の円筒ケーシングの姿勢を容易に鉛直に保って簡易に圧入させることができる。
また、従来のような土留支保工を設けることを不要となして円筒状ケーシング内をクラブハンマーなどの掘削機によって簡易に掘削することができる。
このため、作業手順を簡略化させて工期の大幅な短縮化を図ることができる。また、鋼矢板や土留支保工の施工費や材料費が不要となり、コストの縮減をはかることができる。さらに、円筒ケーシング内の掘削は、クラブハンマーなどの掘削機械を用いて効率よく行い得て、掘削費の縮減も図ることができる。さらには、従来のような狭隘な掘削溝内での人力作業をなくすことができ、作業性の向上が図れるようになる。 According to the invention of the in-situ water purification method for contaminated soil shown in claim 1, when constructing a water injection well and a pumping well both constructed as permeable walls by crushed stone, dredged sand, etc., a cylindrical casing is used. The inside of the drilling hole is drilled to the predetermined depth, and crushed stones and cinnabar sand are put back into the excavation hole, and then the casing is pulled out to form a water-permeable column made of crushed stones and cinnabar sand. A series of operations of the water column forming process is a basic construction work, and the water column forming process which is the basic construction work is repeatedly performed to form a large number of water column. At this time, a single water-permeable column is formed to form water-permeable columns that are spaced apart from each other. A wall forming step is performed to form a continuous water-permeable wall. In other words, when forming a continuous water-permeable wall by wrapping the water-permeable column, first, the water-permeable column is formed by jumping one water-permeable column, and then the water-permeable columns whose both sides are wrapped on the adjacent left and right water-permeable columns. Since it is formed into a continuous water-permeable wall, the reaction force from the ground when the cylindrical casing is press-fitted can be made symmetrical, and the posture of the cylindrical casing at the time of press-fitting can be easily maintained vertically. Can be press-fitted.
Further, it is not necessary to provide a conventional earth retaining support, and the inside of the cylindrical casing can be easily excavated by an excavator such as a club hammer.
For this reason, the work procedure can be simplified and the construction period can be greatly shortened. In addition, construction costs and material costs for steel sheet piles and earth retaining structures are not required, and costs can be reduced. Furthermore, excavation in the cylindrical casing can be efficiently performed using an excavating machine such as a club hammer, and the excavation cost can be reduced. Furthermore, it is possible to eliminate the manual work in the narrow excavation groove as in the prior art, and the workability can be improved.

請求項２に示す汚染土壌の原位置通水浄化工法の発明によれば、相互に離間した通水性柱を形成し、爾後、該離間して隣接する２つの通水性柱にそれぞれ均等にラップさせて、前記通水性壁形成工程を行って連続した通水性壁を形成するので、つまり、通水性柱をラップさせて連続した通水性壁に構成するにあたって、先ず通水性柱を１つ飛びに形成し、その後、隣接する左右の通水性柱に両側部がラップする通水性柱を形成して連続した通水性壁に形成していくので、円筒ケーシングの圧入時の地盤からの反力を左右対称となし得、当該圧入時の円筒ケーシングの姿勢を容易に鉛直に保って簡易に圧入させることができる。   According to the in-situ water purification method for contaminated soil shown in claim 2, the water-permeable columns spaced apart from each other are formed, and then, the two separated water-permeable columns spaced apart from each other are evenly wrapped. In order to form a continuous water-permeable wall by performing the water-permeable wall forming step, that is, when a water-permeable column is wrapped to form a continuous water-permeable wall, first, one water-permeable column is formed. After that, a water-permeable column that wraps on both sides is formed on the adjacent left and right water-permeable columns to form a continuous water-permeable wall, so the reaction force from the ground when the cylindrical casing is press-fitted is symmetrical It is possible to easily press-fit the cylindrical casing at the time of press-fitting while keeping the posture of the cylindrical casing vertical.

以下に、本発明に係る汚染土壌の原位置通水浄化工法の好適な実施の形態について、添付図面に基づき詳述する。
ここで、本実施形態の原位置通水浄化工法は前述した図３〜図５の従来例と同様に、地盤中の汚染土壌層Ａを挟んで、共に砕石１０や硅砂等を用いた通水性の壁状に形成した揚水井戸６と注水井戸４とを設け、前記注水井戸４から地盤に注入した水を、前記汚染土壌層Ａを通過させた後に揚水井戸６から汲み上げるようにした汚染土壌の原位置通水浄化工法である。従って、当該図３〜図５の全体的な基本構成は本実施形態にも共通するものである。よって、当該基本構成を備えていることを前提としてその詳細な説明は省略する。 Hereinafter, preferred embodiments of the in-situ water purification method for contaminated soil according to the present invention will be described in detail with reference to the accompanying drawings.
Here, the in-situ water purification method of the present embodiment is water-permeable using crushed stone 10 or dredged sand, etc., with the contaminated soil layer A sandwiched between the ground as in the conventional examples of FIGS. Of the contaminated soil in which the pumping well 6 and the water injection well 4 formed in the shape of the wall are pumped, and the water injected from the water injection well 4 into the ground is pumped from the water pumping well 6 after passing through the contaminated soil layer A. In-situ water purification method. Therefore, the overall basic configuration of FIGS. 3 to 5 is common to this embodiment. Therefore, the detailed description is omitted on the assumption that the basic configuration is provided.

即ち、本実施形態の原位置通水浄化工法が前述の従来例と相違する点は、注水井戸４と揚水井戸６との施工方法、特に両井戸４，６を砕石や硅砂などを用いた通水性壁１２に形成する施工方法にある。具体的には、多数の円柱状の通水性柱を逐次並設形成していって、隣接する通水性柱は相互にその側部をラップさせることで連続した通水性壁に形成するものであり、両井戸４，６ともその施工方法は基本的には全く同一である。よって以下には、当該通水性壁１２の形成方法について、揚水井戸６を例にして述べる。   That is, the in-situ water purification method of the present embodiment is different from the above-described conventional example in that the construction method of the water injection well 4 and the pumping well 6, especially the two wells 4, 6 using crushed stone or dredged sand. The construction method is to form the aqueous wall 12. Specifically, a large number of cylindrical water-permeable columns are sequentially formed side by side, and adjacent water-permeable columns are formed on a continuous water-permeable wall by wrapping their side portions. The construction method of both wells 4 and 6 is basically the same. Therefore, the method for forming the water-permeable wall 12 will be described below by taking the pumping well 6 as an example.

図１は本発明の原位置通水浄化工法における揚水井戸６の施工方法を説明するための平断面概略図である。図示するように揚水井戸６は、円筒状ケーシング４０を用いて円柱状の通水性柱４２を形成する通水性柱形成工程と、その形成済みの通水性柱４２に側部をラップさせた状態で前記通水性柱形成工程を行うことで、通水性柱４２を相互に繋げて連続した通水性壁１２に形成していく通水性壁形成工程とを経て所望長に形成されていく。   FIG. 1 is a schematic cross-sectional view for explaining a construction method of a pumping well 6 in the in-situ water purification method of the present invention. As shown in the drawing, the pumping well 6 has a water-permeable column forming step in which a cylindrical water-permeable column 42 is formed using a cylindrical casing 40, and a side portion is wrapped around the formed water-permeable column 42. By performing the water-permeable column forming step, the water-permeable column 42 is formed to have a desired length through a water-permeable wall forming step in which the water-permeable columns 42 are connected to each other to form the continuous water-permeable wall 12.

ここで、上記通水性柱形成工程は逐次繰り返して行われる施工作業の基本単位となるもので、円筒状ケーシング４０を所定の深度まで圧入しながら掘削する作業と、この掘削作業の終了後にその掘削孔４６内に原地盤の高さまで砕石１０（硅砂などでも良い）を投入充填して埋め戻す作業と、この埋め戻し作業の終了後に前記円筒状ケーシング４０を引き抜くケーシング引き抜き作業とからなる。   Here, the water-permeable column forming step is a basic unit of construction work that is sequentially repeated. The work for excavating the cylindrical casing 40 while press-fitting it into a predetermined depth, and the excavation work after the excavation work is completed. The hole 46 includes a work of charging and filling the crushed stone 10 (or crushed sand or the like) up to the height of the original ground, and a casing drawing operation of drawing the cylindrical casing 40 after the backfilling operation is completed.

ここで、本実施形態では、円筒状ケーシング４０の直径よりも大きく、かつ、当該直径の２倍よりも小さい中心線間のピッチ間隔で、前記施工作業の基本単位となる通水性柱形成工程が行なわれる。これにより、相互に離間した多数の通水性柱４２が先行して形成されることになる。そして、これらの離間して隣接する２つの形成済みの通水性柱４２，４２にそれぞれ均等に両側部をラップさせた状態で、両側方の２つの通水性柱４２，４２を繋ぐようにして前記施工作業の基本単位である通水性柱形成工程を行うことで、連続した通水性壁１２に形成していく通水性壁形成工程が行われるようになっている。   Here, in the present embodiment, a water-permeable column forming step that is a basic unit of the construction work is performed at a pitch interval between center lines that is larger than the diameter of the cylindrical casing 40 and smaller than twice the diameter. Done. Thereby, many water-permeable columns 42 spaced apart from each other are formed in advance. The two water-permeable columns 42, 42 on both sides are connected to each other in a state where both side portions are equally wrapped with the two formed water-permeable columns 42, 42 adjacent to each other. By performing the water-permeable column forming process which is the basic unit of the construction work, the water-permeable wall forming process of forming the continuous water-permeable wall 12 is performed.

当該図示例では、円筒状ケーシング４０には直径Ｄが１３００ｍｍの鋼管を使用して、中心線間のピッチＰを１０００ｍｍにして相互に側部がラップする通水性柱４２を形成するようにしており、この場合には形成される通水性壁１２の最小厚み部の寸法Ｗｍｉｎは８３０ｍｍとなる。また、当該揚水井戸６の場合には、揚水ポンプを下端に有した揚水管２２を挿入するための多孔質管１４が所定の位置に複数個配置されることになるが、当該多孔質管１４は配置該当部位に通水性柱４２を形成する際に、その埋め戻し作業時に予め埋め込まれて設けられる。   In the illustrated example, a steel pipe having a diameter D of 1300 mm is used for the cylindrical casing 40, and a pitch P between the center lines is set to 1000 mm so as to form water-permeable columns 42 whose side portions wrap around each other. In this case, the dimension Wmin of the minimum thickness portion of the water-permeable wall 12 to be formed is 830 mm. In the case of the pumping well 6, a plurality of porous pipes 14 for inserting the pumping pipes 22 having a pumping pump at the lower end are arranged at predetermined positions. When the water-permeable column 42 is formed at the position corresponding to the arrangement, it is embedded in advance during the backfilling operation.

図２は円筒状ケーシング４０を地盤中に圧入させる機能と、圧入した円筒状ケーシング４０内の土壌を掘削する機能とを備えた掘削機４８であり、円筒状ケーシング４０は当該掘削機の圧入機構部５０によって、周側部を把持されて揺動回転されながら地盤中に圧入され、適宜に上部に鋼管の円筒状ケーシング４０が継ぎ足されて所定の深さまで打設される。また、円筒状ケーシング４０の内部の土壌は掘削機４８のブーム５２先端から吊り下げられたクラブハンマー５４によって掘削される。   FIG. 2 shows an excavator 48 having a function of press-fitting the cylindrical casing 40 into the ground and a function of excavating soil in the press-fitted cylindrical casing 40. The cylindrical casing 40 is a press-fitting mechanism of the excavator. The portion 50 is press-fitted into the ground while grasping the peripheral side portion and being swung and rotated, and a cylindrical casing 40 of a steel pipe is suitably added to the upper portion and driven to a predetermined depth. The soil inside the cylindrical casing 40 is excavated by a club hammer 54 suspended from the tip of the boom 52 of the excavator 48.

以上のようにして施工される汚染土壌の原位置通水浄化工法によれば、通水性壁１２として構成される注水井戸４と揚水井戸６とを施工するにあたって、円筒状ケーシング４０を地盤に圧入してその内部を掘削し、所定深さまで掘削した掘削孔４６内に砕石１０を投入して埋め戻した後、ケーシング４０を引き抜いて通水性柱４２を形成するという通水性柱形成工程の一連の作業を施工作業の基本単位となして、この基本単位の施工作業である通水性柱形成工程を繰り返し行って多数の通水性柱４２を形成する。   According to the in-situ water purification method for contaminated soil constructed as described above, the cylindrical casing 40 is press-fitted into the ground when constructing the water injection well 4 and the pumping well 6 configured as the water-permeable wall 12. Then, after the inside is excavated, the crushed stone 10 is put into the excavation hole 46 excavated to a predetermined depth and backfilled, and then the casing 40 is pulled out to form the water-permeable column 42. The work is a basic unit of the construction work, and the water-permeable column forming process which is the construction work of this basic unit is repeatedly performed to form a large number of water-permeable columns 42.

そして、隣接する通水性柱４２，４２は上記基本単位の施工作業である通水性柱形成工程を行う際に、一方の形成済みの通水性柱４２に対して、他方をその側部同士をラップさせて形成することで、連続した通水性壁１２に構成していくので、従来のような土留支保工を不要となして、円筒状ケーシング４０内を掘削機のクラブハンマー５４等によって簡易に掘削することができ、作業手順を簡略化させて工期の大幅な短縮化を図ることができる。   And when the water-permeable column 42 and 42 which adjoins perform the water-permeable column formation process which is the construction work of the said basic unit, it wraps the other side with respect to one formed water-permeable column 42. As a result, the continuous water-permeable wall 12 is formed, so that a conventional earth retaining support is not required, and the inside of the cylindrical casing 40 is easily excavated by the club hammer 54 of an excavator. The work procedure can be simplified and the construction period can be greatly shortened.

また、鋼矢板や土留支保工の施工費や材料費が不要となり、コストの縮減を図ることができる。さらに、クラブハンマー５４などの掘削機械による円筒状ケーシング４０内の掘削は効率よく行い得て、掘削費の縮減も図ることができる。またさらに、従来のような狭隘な掘削溝内での人力作業をなくすことができ、作業性の向上が格段に図れるようになる。   In addition, construction costs and material costs for steel sheet piles and earth retaining structures are not required, and costs can be reduced. Furthermore, excavation in the cylindrical casing 40 by an excavating machine such as the club hammer 54 can be performed efficiently, and the excavation cost can be reduced. Furthermore, it is possible to eliminate the manual work in a narrow excavation groove as in the prior art, and the workability can be greatly improved.

さらには、基本単位の施工作業である通水性柱形成工程を繰り返し行って、多数の通水性柱４２を形成し、隣接する通水性柱４２，４２は相互に側部をラップさせて形成することで、連続した通水性壁１２に構成するので、通水性壁４２を湾曲した任意の円弧状に形成することも容易になり、例えば注水井戸４と揚水井戸６とを同心円状に配置することも簡易に行うことができるようになる。   Furthermore, the water-permeable column forming process which is the construction work of the basic unit is repeatedly performed to form a large number of water-permeable columns 42, and the adjacent water-permeable columns 42 and 42 are formed by wrapping the side portions with each other. Then, since the continuous water-permeable wall 12 is configured, it is easy to form the water-permeable wall 42 in a curved arc shape. For example, the water injection well 4 and the pumping well 6 may be arranged concentrically. It becomes possible to do simply.

また、通水性柱４２をラップさせて連続した通水性壁１２に構成するにあたって、先ず、中心線間のピッチＰが直径Ｄより大きく、かつ直径Ｄの２倍より小さい間隔で形成されて、相互にラップすることなく離間した状態で通水性柱４２を多数形成し、爾後、その離間して隣接する形成済みの２つの通水性柱４２，４２の間に、それぞれの通水性柱４２，４２に両側部を均等にラップさせて通水性柱形成工程を行って、それらを繋ぐ通水性柱４２を形成して連続した通水性壁１２に形成する通水性壁形成工程を行うようにすることで、つまり、先ず通水性柱４２を１つ飛びに形成し、その後、その１つ飛びにして形成済みの通水性柱４２，４２の間に、それら形成済みの通水性柱４２，４２に両側部がラップする通水性柱４２を形成して連続した通水性壁１２に形成していくようにすることで、円筒状ケーシング４０の圧入時に地盤から受ける反力を左右対称となし得て、当該圧入時の円筒状ケーシング４０の姿勢を容易に鉛直に保って簡易に圧入させることができる。   Further, when the continuous water-permeable wall 12 is formed by wrapping the water-permeable columns 42, first, the pitch P between the center lines is formed at an interval larger than the diameter D and smaller than twice the diameter D, A large number of water-permeable columns 42 are formed in a state of being separated without wrapping them, and after the heeling, between the two water-permeable columns 42 and 42 that are separated and adjacent to each other, By carrying out the water-permeable column forming process by wrapping both sides evenly, and forming the water-permeable column 42 connecting them to form the continuous water-permeable wall 12, That is, first, the water-permeable column 42 is formed in one jump, and then, between the formed water-permeable columns 42 and 42, both sides are formed between the formed water-permeable columns 42 and 42. Continuously forming the water-permeable column 42 to be wrapped By forming on the water-permeable wall 12, the reaction force received from the ground when the cylindrical casing 40 is press-fitted can be made symmetrical, and the posture of the cylindrical casing 40 at the time of press-fitting can be easily vertical. And can be easily press-fitted.

本発明の要部である注水井戸と揚水井戸との掘削方法を説明するための概略平面図である。It is a schematic plan view for demonstrating the excavation method of the water injection well and the pumping well which is the principal part of this invention. 円筒状ケーシングを圧入して内部を掘削する際に用いる掘削機の概略図である。It is the schematic of the excavator used when press-fitting a cylindrical casing and excavating the inside. 本発明と従来例とに共通するもので、汚染土壌の原位置通水浄化工法の全体の概略構成を示す平面図である。It is common in this invention and a prior art example, and is a top view which shows the schematic structure of the whole in-situ water purification method of contaminated soil. 図３中のIV−IV線矢視断面図である。FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. 本発明と従来例とに共通するもので、汚染土壌の原位置通水浄化工法の浄化システムの全体構成を示す概略図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the whole structure of the purification system of an in-situ water purification method of contaminated soil which is common to this invention and a prior art example. 従来の注水井戸と揚水井戸との掘削方法を説明するもので、（ａ）は平面図で、（ｂ）は縦断面図である。A conventional excavation method for a water injection well and a pumping well will be described, wherein (a) is a plan view and (b) is a longitudinal sectional view.

符号の説明Explanation of symbols

２ 遮蔽壁
４ 注水井戸
６ 揚水井戸
８ 掘削溝
１０ 砕石
１２ 通水性壁
１４ 多孔質管
１８ 調整槽
２０ 給水管
２２ 揚水管
２４ 原水槽
２６ 処理層
４０ 円筒状ケーシング
４２ 通水性柱
４６ 掘削孔
Ａ 浄化対象土壌層
Ｃ 粘土質層 2 Shielding Wall 4 Water Injection Well 6 Pumping Well 8 Drilling Groove 10 Crushed Stone 12 Water-permeable Wall 14 Porous Pipe 18 Adjusting Tank 20 Water Supply Pipe 22 Pumping Pipe 24 Raw Water Tank 26 Treatment Layer 40 Cylindrical Casing 42 Water-permeable Column 46 Drilling Hole A Purification Target soil layer C clayey layer

Claims (1)

地盤中の汚染土壌を挟んで、共に砕石等で通水性の壁状に形成した揚水井戸と注水井戸とを設け、前記注水井戸から地盤に注入した水を、前記汚染土壌を通過させた後に揚水井戸から汲み上げるようにした汚染土壌の原位置通水浄化工法であって、
前記壁状の注水井戸と揚水井戸とを、
円筒状のケーシングを所定の深度まで圧入しながら掘削した後に、原地盤の高さまで砕石等で埋め戻してから、前記円筒状ケーシングを引き抜いて円柱状の通水性の柱を形成する通水性柱形成工程と、
形成済みの通水性の柱にラップさせて前記通水性柱形成工程を行うことで連続した通水性の壁に形成していく通水性壁形成工程との、２つの形成工程を経て形成し、
前記通水性柱形成工程では、前記円筒ケーシングの直径よりも大きく、かつ該直径の２倍よりも小さいピッチ間隔で通水性柱を相互に離間させて形成した後、
該離間して隣接する２つの通水性柱にそれぞれ均等にラップさせて、前記通水性壁形成工程を行って連続した通水性壁を形成することを特徴とする汚染土壌の原位置通水浄化工法。 A pumping well and a water injection well that are both formed into a water-permeable wall shape with crushed stone and the like sandwiching the contaminated soil in the ground, and pumping water after passing the water injected from the water injection well into the ground through the contaminated soil In-situ water purification method for contaminated soil pumped up from a well,
The wall-shaped water injection well and the pumping well,
Drilling a cylindrical casing to a predetermined depth and then backfilling it with crushed stone to the height of the original ground, and then pulling out the cylindrical casing to form a cylindrical water-permeable column Process,
Formed through two forming steps, a water-permeable wall forming step that forms a continuous water-permeable wall by wrapping the formed water-permeable column and performing the water-permeable column forming step ,
In the water-permeable column forming step, after forming the water-permeable columns spaced apart from each other at a pitch interval larger than the diameter of the cylindrical casing and smaller than twice the diameter,
In-situ water purification method for contaminated soil , wherein the water-permeable wall forming step is performed by uniformly wrapping the two water-permeable columns adjacent to each other at a distance and performing the water-permeable wall forming step. .
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