JP2011020057A - Soil contamination cleaning zone construction method, soil contamination cleaning zone and soil contamination cleaning method - Google Patents

Soil contamination cleaning zone construction method, soil contamination cleaning zone and soil contamination cleaning method Download PDF

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JP2011020057A
JP2011020057A JP2009167606A JP2009167606A JP2011020057A JP 2011020057 A JP2011020057 A JP 2011020057A JP 2009167606 A JP2009167606 A JP 2009167606A JP 2009167606 A JP2009167606 A JP 2009167606A JP 2011020057 A JP2011020057 A JP 2011020057A
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purification
wall
zone
groundwater
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JP5226624B2 (en
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Masayoshi Ikeda
昌義 池田
Masanobu Hashimoto
正信 橋本
Rintaro Okuno
倫太郎 奥野
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Japan Foundation Engineering Co Ltd
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  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Processing Of Solid Wastes (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To surely construct a continuous wall surface by a cleaning material by efficiently using the cleaning material. <P>SOLUTION: The soil contamination cleaning zone construction method includes: a process of installing a drilling pipe to an impermeable layer, filling a permeable cleaning material into the drilling pipe, drawing the drilling pipe and continuously constructing a cleaning body wall whose bottom is the impermeable layer; and a process of installing a sheet pile to the impermeable layer so as to be filled inside a cleaning body adjacent to the connection part of the respective cleaning walls, respectively. The process of continuously constructing the cleaning wall includes: a cleaning wall construction procedure of installing the drilling pipe to the impermeable layer, filling the permeable cleaning material into the drilling pipe, drawing the drilling pipe and constructing the cleaning wall; and a skip procedure of securing a position separated by a distance for the diameter of the drilling pipe next to the cleaning wall constructed by the cleaning wall construction procedure. The cleaning wall construction procedure and the skip procedure are alternately performed with respect to an area for constructing a ground water cleaning zone, the cleaning wall is constructed alternately, then the cleaning wall construction procedure is performed at the position secured by the skip procedure, and the respective cleaning walls are continuously formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、汚染物質が地下水を介して拡散する慮のある領域の地下水流下域、又は周囲の地中に、汚染物質の拡散を防ぐ地下水浄化ゾーンを構築する土壌汚染浄化ゾーン工法、土壌汚染浄化ゾーン及び土壌汚染浄化方法を提供する。   The present invention relates to a soil contamination purification zone construction method for constructing a groundwater purification zone that prevents diffusion of contaminants in a groundwater flow lower area of an area where the contaminants are expected to diffuse through groundwater, or in the surrounding ground, and soil contamination purification. Provide zone and soil pollution purification methods.

従来より、汚染物質が地下水を介して拡散する慮のある領域の地下水流下域、又は周囲の地中に、掘削、充填を繰り返すことにより、所定の幅を持つ連続した浄化杭を構築する、又は、遮断壁を構築し、浄化杭を遮断壁に連接するように浄化杭を構築する、又は、遮断構造物を地中に構築し透水孔を経て浄化材中を流下することが行われてきた。   Conventionally, a continuous purification pile with a predetermined width is constructed by repeating excavation and filling in the groundwater flow lower area of the area where the contaminants are supposed to diffuse through the groundwater, or in the surrounding ground, or It has been practiced to build a barrier wall and build a purification pile so that the purification pile is connected to the barrier wall, or to build a barrier structure in the ground and flow down through the water purification hole .

特開２００７−２９９０４号公報JP 2007-29904 A 特開２００５−２９６８２４号公報JP 2005-296824 A

しかしながら、上述した従来の工法では、連続した浄化杭を構築するにあたり、図８に示すように、浄化杭１が円柱であるため、汚染濃度に応じた地下水浄化ゾーンの幅２よりはみ出す孔３が必要である。また、浄化杭１が円柱であるため、重なった分４だけ浄化材の無駄が生じる。即ち、孔３がオーバーラップするため、先に充填した浄化材を次に掘削する際に排出し改めて浄化材を充填することにより、材料の無駄が生じ材料コストがかかっていた。   However, in the conventional construction method described above, in constructing a continuous purification pile, as shown in FIG. 8, the purification pile 1 is a cylinder, so that the holes 3 protruding from the width 2 of the groundwater purification zone corresponding to the contamination concentration are formed. is necessary. Moreover, since the purification pile 1 is a cylinder, waste of the purification material is generated by the amount of overlap 4. In other words, since the holes 3 overlap each other, the previously filled purifying material is discharged at the time of next excavation and is refilled with the purifying material, resulting in waste of material and high material cost.

また、連続しない浄化杭を構築した場合は、浄化材に接触することなく汚染物質が地下水を介して拡散する慮が残った。
また、遮断壁に連接した浄化杭を構築する方法では、遮断壁を施工する機械と浄化杭を施工する機械の最低２種類の機械を持ち込む必要があったうえ、遮断壁が安定するまで浄化杭の施工を待つ必要があった。また、浄化杭を施工する際に、せっかく構築した遮断壁を壊してしまう可能性もあった。
さらに、遮断構造物を地中に構築する方法は、浄化材を交換せしめる利点は大きいが、永久構造物であることから浄化後の撤去にコストがかかってしまう。 Also, when discontinuous purification piles were constructed, there was a concern that the pollutants would diffuse through the groundwater without contacting the purification material.
Moreover, in the method of constructing the purification pile connected to the barrier wall, it was necessary to bring in at least two types of machines, the machine for constructing the barrier wall and the machine for constructing the purification pile, and until the barrier wall became stable It was necessary to wait for construction. Moreover, when constructing the purification pile, there was a possibility that the constructed barrier wall would be broken.
Furthermore, the method of constructing the blocking structure in the ground has a great advantage of exchanging the purification material, but since it is a permanent structure, it costs to remove after purification.

本発明は斯かる従来の問題点を解決するために為されたもので、その目的は、浄化材を無駄なく使用し、浄化材による連続壁面が確実に構築でき、汚染物質の拡散を確実に防止することが可能な土壌汚染浄化ゾーン工法、土壌汚染浄化ゾーン及び土壌汚染浄化方法を提供することにある。   The present invention has been made to solve such conventional problems, and its purpose is to use the purifying material without waste, to build a continuous wall surface with the purifying material, and to ensure the diffusion of pollutants. An object of the present invention is to provide a soil contamination purification zone method, a soil contamination purification zone, and a soil contamination purification method that can be prevented.

請求項１に係る発明は、汚染地下水の下流側流域の地中に前記汚染地下水の流向を横断する方向に前記汚染地下水中の汚染物質の拡散を防止する地下水浄化ゾーンを構築する土壌汚染浄化ゾーン工法において、前記横断する方向に削孔管を前記地中の汚染土壌層の下にある不透水層まで並列に建て込み、建て込まれた前記削孔管内に透過性浄化材を充填し、前記削孔管を引き抜いて不透水層を底盤とする浄化体壁を連続して構築する工程と、前記各浄化壁の連接部に隣接する前記浄化体内に填り込むように前記地下水浄化ゾーンの方向に平行して矢板を前記不透水槽までそれぞれ建て込む工程とを備え、前記浄化壁を連続して構築する工程は、前記削孔管を前記不透水層まで建て込み、建て込まれた前記削孔管内に透過性浄化材を充填し、前記削孔管を引き抜き浄化壁を構築する浄化壁構築手順と、前記浄化壁構築手順によって構築された浄化壁の隣に前記削孔管の直径分の距離を隔てた位置を確保する飛ばし手順とを有し、前記地下水浄化ゾーンを構築する領域に、前記浄化壁構築手順と前記飛ばし手順とを交互に行い、前記浄化壁を一つ飛ばしに構築した後、前記飛ばし手順で確保した位置に前記浄化壁構築手順を行い、各浄化壁と連続して形成することを特徴とする。   The invention according to claim 1 is a soil contamination purification zone that constructs a groundwater purification zone that prevents diffusion of contaminants in the contaminated groundwater in a direction crossing the flow direction of the contaminated groundwater in the ground of the downstream basin of the contaminated groundwater. In the construction method, in the transverse direction, the drilling pipe is built in parallel to the impermeable layer under the contaminated soil layer in the ground, and the built-up drilling pipe is filled with a permeable purification material, A step of continuously constructing a purification body wall with the impermeable layer as a bottom by pulling out a bore tube, and a direction of the groundwater purification zone so as to be embedded in the purification body adjacent to the connecting portion of each purification wall And the step of continuously constructing the purification wall includes the step of constructing the drilling tube up to the impermeable layer, and the step of constructing the purification wall in parallel to the impervious tank. Fill the pore tube with permeable purification material, A purification wall construction procedure for constructing a purification wall by pulling out the borehole pipe, and a flying procedure for securing a position separated by a distance corresponding to the diameter of the borehole pipe next to the purification wall constructed by the purification wall construction procedure. And in the region where the groundwater purification zone is constructed, the purification wall construction procedure and the skipping procedure are alternately performed, and the purification wall is constructed to skip one, and then the purification is performed at a position secured by the skipping procedure. It is characterized in that a wall construction procedure is carried out and formed continuously with each purification wall.

請求項２に係る発明は、汚染地下水の下流側流域の地中に前記汚染地下水の流向を横断する方向に前記汚染地下水中の汚染物質の拡散を防止する地下水浄化ゾーンを構築する土壌汚染浄化ゾーン工法において、前記横断する方向に単軸若しくは多軸の掘削軸を備えた掘削機を用いて前記地中の汚染土壌層の下にある不透水層まで掘削し、透過性浄化材を充填して不透水層を底盤とする浄化体壁を連続して構築する工程と、前記各浄化壁の連接部に隣接する前記浄化体内に填り込むように前記地下水浄化ゾーンの方向に平行して矢板を前記不透水槽までそれぞれ建て込む工程とを備え、前記浄化壁を連続して構築する工程は、前記不透水層まで掘削し、透過性浄化材を充填して浄化壁を構築する浄化壁構築手順と、前記浄化壁構築手順によって構築された浄化壁の隣に前記掘削軸の直径分の距離を隔てた位置を確保する飛ばし手順とを有し、前記地下水浄化ゾーンを構築する領域に、前記浄化壁構築手順と前記飛ばし手順とを交互に行い、前記浄化壁を一つ飛ばしに構築した後、前記飛ばし手順で確保した位置に前記浄化壁構築手順を行い、各浄化壁と連続して形成することを特徴とする。   The invention according to claim 2 is a soil contamination purification zone for constructing a groundwater purification zone that prevents diffusion of contaminants in the contaminated groundwater in the direction crossing the flow direction of the contaminated groundwater in the ground of the downstream basin of the contaminated groundwater. In the construction method, excavating to the impermeable layer under the contaminated soil layer in the ground using an excavator equipped with a single-axis or multi-axis drill shaft in the transverse direction, and filling with a permeable purification material A step of continuously constructing a purification body wall having an impermeable layer as a bottom, and a sheet pile parallel to the direction of the groundwater purification zone so as to be embedded in the purification body adjacent to the connecting portion of each purification wall A step of constructing the purification wall continuously by excavating the impermeable layer and filling a permeable purification material to construct the purification wall. And by the purification wall construction procedure A step of securing a position separated by a distance corresponding to the diameter of the excavation shaft next to the constructed purification wall, and in the region for constructing the groundwater purification zone, the purification wall construction procedure and the skipping procedure, The steps are alternately performed to construct one purification wall, and then the purification wall construction procedure is performed at a position secured by the skipping procedure to continuously form each purification wall.

請求項３に係る発明は、請求項１又は請求項２記載の土壌汚染浄化ゾーン工法によって構築されたことを特徴とする。
請求項４に係る発明は、請求項１又は請求項２記載の土壌汚染浄化ゾーン工法によって構築された土壌汚染浄化ゾーン又は請求項３記載の土壌汚染浄化ゾーンによる土壌汚染浄化方法において、前記土壌汚染の浄化確認後に前記矢板を撤去することを特徴とする。 The invention according to claim 3 is constructed by the soil contamination purification zone construction method according to claim 1 or claim 2.
The invention according to claim 4 is the soil contamination purification zone constructed by the soil contamination purification zone construction method according to claim 1 or claim 2 or the soil contamination purification method by the soil contamination purification zone according to claim 3, wherein the soil contamination The sheet pile is removed after confirmation of purification.

本発明によれば、汚染物質を吸着、保持、又は分解する連続した地下水浄化ゾーンを構築することが可能となる。
また、浄化材が充填された各孔が接触する程度に隣接することから、掘削・充填による浄化材のロスは最小限に抑えられる。 According to the present invention, it is possible to construct a continuous groundwater purification zone that adsorbs, retains, or decomposes contaminants.
In addition, since the holes filled with the purifying material are adjacent to the extent that they contact each other, the loss of the purifying material due to excavation and filling can be minimized.

また、地下水浄化ゾーンが最も薄くなる各孔の接合部に矢板を建て込むことにより、汚染物質を含む地下水は、確実かつ円滑に地下水浄化ゾーン内を透過し、汚染物質が地下水を介して拡散することを防ぐことが可能となる。
また、矢板の建て込みは、先に浄化材が充填され均一となった地中に対して行うことから、バイブロハンマーにより容易に施工できる。 In addition, by installing sheet piles at the joints of each hole where the groundwater purification zone is the thinnest, groundwater containing pollutants will surely and smoothly permeate through the groundwater purification zone and the pollutants will diffuse through the groundwater. It becomes possible to prevent this.
Moreover, since the sheet pile is built in the ground which has been previously filled with the purification material and becomes uniform, it can be easily constructed with a vibro hammer.

本実施形態によって構築された地下水浄化ゾーン１０を示す平面図である。It is a top view which shows the groundwater purification zone 10 constructed | assembled by this embodiment. 本実施形態によって構築された地下水浄化ゾーン１０を示す説明図である。It is explanatory drawing which shows the groundwater purification zone 10 constructed | assembled by this embodiment. 本実施形態によって構築された地下水浄化ゾーン１０を構築する際のケーシングパイプの削孔手順を示す説明図である。It is explanatory drawing which shows the drilling procedure of the casing pipe at the time of constructing the groundwater purification zone 10 constructed | assembled by this embodiment. 図３による削孔の状態を示す説明図である。It is explanatory drawing which shows the state of the drilling hole by FIG. 図３による削孔を行わない場合の状態を示す説明図である。It is explanatory drawing which shows the state when not drilling by FIG. 本実施形態によって構築された地下水浄化ゾーン１０を示す断面図である。It is sectional drawing which shows the groundwater purification zone 10 constructed | assembled by this embodiment. 本実施形態によって構築された地下水浄化ゾーン１０の作用を示す拡大断面図である。It is an expanded sectional view which shows the effect | action of the groundwater purification zone 10 constructed | assembled by this embodiment. 従来の地下水浄化ゾーンを示す平面図である。It is a top view which shows the conventional groundwater purification zone.

以下、本発明を図面に示す実施形態に基づいて説明する。
図１〜図７は、本発明の一実施形態に係る土壌汚染浄化ゾーン工法を示す。
図１、図２は、本実施形態によって構築された地下水浄化ゾーン１０を示す。
地下水浄化ゾーン１０は、汚染物質が地下水を介して拡散する慮のある領域の地下水流下域、又は周囲の地中の汚染土壌層１１の下にある不透水層１２を底盤とする浄化壁１５を連続して構築するとともに、各浄化壁１５の連接部１６に隣接する浄化壁１５内に填り込むように地下水浄化ゾーン１０の方向に平行して矢板１７を不透水層１２までそれぞれ建て込んでいる。 Hereinafter, the present invention will be described based on embodiments shown in the drawings.
1 to 7 show a soil contamination purification zone construction method according to an embodiment of the present invention.
1 and 2 show a groundwater purification zone 10 constructed according to this embodiment.
The groundwater purification zone 10 includes a purification wall 15 having a base of an impermeable layer 12 under a contaminated soil layer 11 in a surrounding groundwater flow lower area or a surrounding soil layer 11 in a region where a contaminant is intended to diffuse through the groundwater. The sheet piles 17 are respectively built up to the impermeable layer 12 in parallel with the direction of the groundwater purification zone 10 so as to be embedded in the purification wall 15 adjacent to the connecting portion 16 of each purification wall 15. Yes.

そして、各浄化壁１５は、削孔管を不透水層１２まで建て込み、その削孔管内に汚染物質を吸着、保持、又は分解する透過性浄化材１４を充填した後に、削孔管を引き抜くことによって構築されている。   And each purification wall 15 builds a hole-drilling pipe to the impermeable layer 12, fills the hole-drilled pipe with a permeable purification material 14 that adsorbs, holds, or decomposes contaminants, and then pulls out the hole-drilled pipe. Is built by that.

次に、本発明の一実施形態に係る土壌汚染浄化ゾーン工法を順を追って説明する。
先ず、図２に示すように、汚染物質が地下水を介して拡散する慮のある領域の地下水流下域、又は周囲の地中の汚染土壌層１１の下にある不透水層１２を底盤とする浄化壁１５を構築する。 Next, the soil contamination purification zone construction method according to an embodiment of the present invention will be described in order.
First, as shown in FIG. 2, purification using an impermeable layer 12 under the contaminated soil layer 11 in the surrounding groundwater flow area or a surrounding groundwater flow area where the contaminants are expected to diffuse through the groundwater as a bottom. The wall 15 is constructed.

浄化壁１５の構築は、例えば、次のようにして行う。
例えば、図３に示すように、浄化壁１５を構築するのに削孔管によって７つの孔１３を掘削する場合について説明する。
削孔は、通常使用する円柱を造成する「ケーシング削孔」とする（ライト方式は矩形削孔専用のＴＲＤマシンを使用する）。例えば、掘削機用いてケーシングパイプ（削孔管）を建て込み、透過性浄化材１４を充填してケーシングパイプを引き抜くことによって行われる。この場合、ケーシング削孔により透過性浄化材１４を置換する。各孔は接触する程度とし、隣孔を掘削する際、隣孔からの透過性浄化材１４の引き込みを最小限に食い止める。 The purification wall 15 is constructed as follows, for example.
For example, as shown in FIG. 3, a case where seven holes 13 are excavated by a drilling tube to construct the purification wall 15 will be described.
The drilling hole is a “casing drilling hole” that creates a commonly used cylinder (the light method uses a TRD machine dedicated to rectangular drilling). For example, it is carried out by building a casing pipe (drilling pipe) using an excavator, filling the permeable purification material 14 and pulling out the casing pipe. In this case, the permeable purification material 14 is replaced by casing drilling. Each hole is in contact with each other, and when the adjacent hole is excavated, the permeation of the permeable purification material 14 from the adjacent hole is minimized.

図３において、７つの孔１３には、紙面の右側から順にＮｏ．１、Ｎｏ．５、Ｎｏ．２、Ｎｏ．６、Ｎｏ．３、Ｎｏ．７、Ｎｏ．４が付されている。これは、削孔の順番を示す。つまり、削孔は一つ飛ばしに行ったあと、飛ばした箇所を削孔することによって行われる。すなわち、先にＮｏ．１、Ｎｏ．２、Ｎｏ．３、Ｎｏ．４の孔１３を掘削し、続いてＮｏ．５、Ｎｏ．６、Ｎｏ．７の孔１３を掘削を行う。削孔は隣接する円柱が接触する間隔で行う。また、削孔径は汚染水が透過するにあたって浄化できる距離を勘案して決められる。
ここでは、一つ飛ばしに、削孔・充填・引抜を数繰り返し、その後飛ばした場所に、削孔・充填・引抜を数繰り返す。 In FIG. 3, the seven holes 13 have No. 1 in order from the right side of the page. 1, no. 5, no. 2, no. 6, no. 3, no. 7, no. 4 is attached. This indicates the order of drilling. That is, the drilling is performed by skipping one spot and then drilling the skipped portion. That is, first, No. 1, no. 2, no. 3, no. No. 4 hole 13 is drilled. 5, no. 6, no. 7 holes 13 are drilled. Drilling is performed at intervals where adjacent cylinders contact. Further, the hole diameter is determined in consideration of the distance that can be purified when contaminated water permeates.
Here, drilling / filling / drawing is repeated several times for each skipping, and then drilling / filling / drawing is repeated several times for the skipped locations.

この操作を具体的に説明する。
Ｎｏ．１の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。次に、Ｎｏ．５の領域を飛ばしてＮｏ．２の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。次に、Ｎｏ．６の領域を飛ばしてＮｏ．３の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。次に、Ｎｏ．７の領域を飛ばしてＮｏ．４の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。 This operation will be specifically described.
No. After the first hole 13 is drilled, the casing pipe is filled with the permeable purification material 14, and then the casing pipe is pulled out. Next, no. No. 5 is skipped and No. 5 is skipped. After drilling the second hole 13, the casing pipe is filled with the permeable purification material 14, and then the casing pipe is pulled out. Next, no. No. 6 is skipped and no. After the third hole 13 is drilled, the casing pipe is filled with the permeable purification material 14, and then the casing pipe is pulled out. Next, no. No. 7 is skipped and No. 7 is skipped. After drilling the four holes 13, the casing pipe is filled with the permeable purification material 14, and then the casing pipe is pulled out.

次に、Ｎｏ．５の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。次に、Ｎｏ．６の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。最後に、Ｎｏ．７の孔１３を削孔した後、ケーシングパイプ内に透過性浄化材１４を充填し、その後にケーシングパイプを引き抜く。
そのため、図４に示すように、各孔１３の左右が同じ条件となるため、削孔の偏心が起こりにくい。 Next, no. After drilling 5 holes 13, the casing pipe is filled with a permeable purification material 14, and then the casing pipe is pulled out. Next, no. After the 6 holes 13 are drilled, the casing pipe is filled with the permeable purification material 14, and then the casing pipe is pulled out. Finally, no. After the hole 13 is drilled, the casing pipe is filled with the permeable purification material 14, and then the casing pipe is pulled out.
Therefore, as shown in FIG. 4, since the left and right of each hole 13 have the same condition, the eccentricity of the drilling hole is unlikely to occur.

これに対し、図５に示すように、紙面の右側から順に図４に示すＮｏ．１、Ｎｏ．５、Ｎｏ．２、Ｎｏ．６、Ｎｏ．３、Ｎｏ．７、Ｎｏ．４の各孔１３を続けて削孔すると、先に削孔した方向に次の削孔が偏芯し易くなるため、削孔の偏心が発生する虞がある。図５では、Ｎｏ．１及びＮｏ．２について説明している。
使用する透過性浄化材１４としては、例えば、鉄粉、活性炭粉、各種キレートおよびこれらの混合物、微生物濾過膜、微生物栄養源およびこれらと前者の混合物がある。 On the other hand, as shown in FIG. 1, no. 5, no. 2, no. 6, no. 3, no. 7, no. If each of the four holes 13 is continuously drilled, the next drilling hole is likely to be eccentric in the previously drilled direction, which may cause eccentricity of the drilling hole. In FIG. 1 and no. 2 is described.
Examples of the permeable purification material 14 to be used include iron powder, activated carbon powder, various chelates and mixtures thereof, microbial filtration membranes, microbial nutrient sources, and the former mixture.

また、充填する透過性浄化材１４は、汚染の内容により自在に変える。汚染を浄化する化学的特性と、周辺地盤の変位を抑制する物理的特性を有することが条件となる。
さらに、透過性浄化材１４は、削孔による周りの土壌の緩みを最低限に抑制するため、砂に透過性浄化材１４を添加し水締めにより固める。 Further, the permeable purification material 14 to be filled is freely changed depending on the content of contamination. It is necessary to have chemical characteristics to purify contamination and physical characteristics to suppress displacement of the surrounding ground.
Furthermore, in order to suppress the loosening of the surrounding soil due to the drilling to the minimum, the permeable purification material 14 is added to the sand and hardened by water tightening.

次に、図１に示すように、削孔が隣接する点を中央に地下水浄化ゾーンの方向に並行に矢板１７を打設する。
矢板１７は、図６に示すように、不透水層１２まで打設される。矢板１７は地下水浄化ゾーン１０の中に行われるため、原地盤の物理的特性（転石の有無、礫質土等）に左右されない。例えば、玉石混じりによる打設不能といった事態はない。 Next, as shown in FIG. 1, a sheet pile 17 is driven in parallel with the direction of the groundwater purification zone, with the point where the hole is adjacent.
As shown in FIG. 6, the sheet pile 17 is driven up to the impermeable layer 12. Since the sheet pile 17 is performed in the groundwater purification zone 10, it is not affected by the physical characteristics of the raw ground (presence of boulders, gravelly soil, etc.). For example, there is no situation where it is impossible to place due to cobblestones.

そして、矢板１７により生じる最短迂回距離（矢印で示す）は、図１に示すように、汚染濃度に応じた地下水浄化ゾーンの幅に匹敵できる削孔径と矢板１７の長さによって確保される。
各浄化壁１５の接触部に矢板１７を建て込むことにより、図７に示すように、矢板１７が透過性浄化材１４の接触機会が最も少なくなる部分（各浄化壁１５の連接部１６）の透過を遮断し、汚染した地下水を浄化剤壁１５の中心部方向に誘導することにより、確実かつ円滑に汚染物質を浄化しつつ流下させることができる。 The shortest detour distance (indicated by an arrow) generated by the sheet pile 17 is ensured by the drilling diameter and the length of the sheet pile 17 comparable to the width of the groundwater purification zone according to the contamination concentration, as shown in FIG.
By installing the sheet pile 17 in the contact portion of each purification wall 15, as shown in FIG. 7, the sheet pile 17 has a portion where the opportunity for contact with the permeable purification material 14 is minimized (the connecting portion 16 of each purification wall 15). By blocking the permeation and guiding the contaminated groundwater toward the central portion of the purifier wall 15, the pollutant can be reliably and smoothly allowed to flow down.

以上によって、本実施形態に係る地下水浄化ゾーン１０を構築することができる。
そして、構築された地下水浄化ゾーン１０によって、汚染物質が透過性浄化材１４によって浄化され、地下水を介して拡散する慮のある領域の地下水流下域、又は周囲の地中に、汚染物質の拡散を防ぐことができる。
本実施形態に係る地下水浄化ゾーン１０による染浄が確認されると、矢板１７は、撤去される。 As described above, the groundwater purification zone 10 according to the present embodiment can be constructed.
Then, the constructed groundwater purification zone 10 purifies the pollutants by the permeable purification material 14 and diffuses the pollutants into the groundwater flow area or the surrounding ground where it is expected to diffuse through the groundwater. Can be prevented.
When the dyeing by the groundwater purification zone 10 according to the present embodiment is confirmed, the sheet pile 17 is removed.

従って、本実施形態に係る地下水浄化ゾーン１０は仮設構造物であり、浄化後は周辺地盤と同等の利用が可能である。透過性浄化材１４は、浄化しながら化学的特性を消失し、周辺地盤の緩みを最低限に抑制する物理的特性を維持する。
浄化後、再汚染が確認された場合、本実施形態に係る地下水浄化ゾーン１０に対して注入工法により浄化に関する化学的特性を復元する。これは、本実施形態に係る地下水浄化ゾーン１０が砂地盤で造成されているからできる。粘性土や岩盤では地下水浄化ゾーンの復元は困難である。 Therefore, the groundwater purification zone 10 according to the present embodiment is a temporary structure and can be used in the same manner as the surrounding ground after purification. The permeable purification material 14 loses chemical characteristics while purifying and maintains physical characteristics that suppress the loosening of the surrounding ground to a minimum.
When recontamination is confirmed after purification, the chemical characteristics relating to purification are restored by an injection method for the groundwater purification zone 10 according to the present embodiment. This can be done because the groundwater purification zone 10 according to the present embodiment is made of sand. Restoration of the groundwater purification zone is difficult for cohesive soil and bedrock.

なお、上記実施形態では、必要な数のケーシングパイプを建て込んでおいて、それぞれに透過性浄化材１４を充填し、その後に全てのケーシングパイプを引き抜く場合について説明したが、本発明はこれに限らず、例えば、浄化の状況に応じ、ケーシングパイプを追加施工し、それぞれに透過性浄化材１４を充填し、その後に全てのケーシングパイプを引き抜くことも可能である。
また、上記実施形態では、削孔は、通常使用する円柱を造成する「ケーシング削孔」とする（ライト方式は矩形削孔専用のＴＲＤマシンを使用する）場合について説明したが、本発明は、これに限らず、例えば、単軸若しくは多軸の掘削軸を備えた掘削機用いて掘削して、透過性浄化材を充填しても良い。この場合、単軸若しくは多軸の掘削軸を備えた掘削機用いて掘削して、透過性浄化材を充填する。軸孔の接合は隣孔からの浄化材の引き込みを最小限に食い止める。 In the above embodiment, a case has been described in which a necessary number of casing pipes are installed, each of which is filled with the permeable purification material 14, and then all the casing pipes are pulled out. For example, according to the state of purification, it is possible to additionally construct casing pipes, fill each with permeable purification material 14, and then pull out all the casing pipes.
Further, in the above-described embodiment, the case where the drilling hole is a “casing drilling hole” that forms a commonly used cylinder (the light method uses a TRD machine dedicated to rectangular drilling), but the present invention is For example, the permeable purifier may be filled by excavating using an excavator having a single-axis or multi-axis excavation shaft. In this case, excavation is performed using an excavator having a single-axis or multi-axis excavation shaft, and the permeable purification material is filled. The joining of the shaft hole prevents the purification material from being drawn in from the adjacent hole to a minimum.

１０ 地下水浄化ゾーン
１１ 汚染土壌層
１２ 不透水層
１３ 孔
１４ 透過性浄化材
１５ 浄化壁
１６ 各浄化壁１５の連接部
１７ 矢板
DESCRIPTION OF SYMBOLS 10 Groundwater purification zone 11 Contaminated soil layer 12 Impermeable layer 13 Hole 14 Permeable purification material 15 Purification wall 16 Connection part 17 of each purification wall 15 Sheet pile

Claims (4)

汚染地下水の下流側流域の地中に前記汚染地下水の流向を横断する方向に前記汚染地下水中の汚染物質の拡散を防止する地下水浄化ゾーンを構築する土壌汚染浄化ゾーン工法において、
前記横断する方向に削孔管を前記地中の汚染土壌層の下にある不透水層まで並列に建て込み、建て込まれた前記削孔管内に透過性浄化材を充填し、前記削孔管を引き抜いて不透水層を底盤とする浄化体壁を連続して構築する工程と、
前記各浄化壁の連接部に隣接する前記浄化体内に填り込むように前記地下水浄化ゾーンの方向に平行して矢板を前記不透水槽までそれぞれ建て込む工程と
を備え、
前記浄化壁を連続して構築する工程は、
前記削孔管を前記不透水層まで建て込み、建て込まれた前記削孔管内に透過性浄化材を充填し、前記削孔管を引き抜き浄化壁を構築する浄化壁構築手順と、
前記浄化壁構築手順によって構築された浄化壁の隣に前記削孔管の直径分の距離を隔てた位置を確保する飛ばし手順と
を有し、
前記地下水浄化ゾーンを構築する領域に、前記浄化壁構築手順と前記飛ばし手順とを交互に行い、前記浄化壁を一つ飛ばしに構築した後、前記飛ばし手順で確保した位置に前記浄化壁構築手順を行い、各浄化壁と連続して形成する
ことを特徴とする土壌汚染浄化ゾーン工法。 In the soil pollution purification zone method of constructing a groundwater purification zone that prevents diffusion of contaminants in the contaminated groundwater in the direction crossing the flow direction of the contaminated groundwater into the ground of the downstream basin of the contaminated groundwater,
In the transverse direction, a drilling pipe is installed in parallel up to the impermeable layer below the contaminated soil layer in the ground, and the built-up drilling pipe is filled with a permeable purification material, and the drilling pipe A process of continuously constructing a purification body wall with an impermeable layer as a bottom by pulling out
A step of laying a sheet pile up to the impervious tank in parallel with the direction of the groundwater purification zone so as to be embedded in the purification body adjacent to the connecting portion of each purification wall,
The step of continuously constructing the purification wall includes
A purification wall construction procedure in which the hole drill tube is built up to the impermeable layer, a permeable purification material is filled in the built-in hole drill pipe, and the hole is pulled out to construct a purification wall.
A skipping procedure for securing a position separated by a distance corresponding to the diameter of the drilling pipe next to the purification wall constructed by the purification wall construction procedure;
In the area for constructing the groundwater purification zone, the purification wall construction procedure and the skipping procedure are alternately performed, and the purification wall construction procedure is performed at a position secured by the skipping procedure after the purification wall is constructed by one skipping. Soil pollution purification zone construction method, characterized in that it is formed continuously with each purification wall. 汚染地下水の下流側流域の地中に前記汚染地下水の流向を横断する方向に前記汚染地下水中の汚染物質の拡散を防止する地下水浄化ゾーンを構築する土壌汚染浄化ゾーン工法において、
前記横断する方向に単軸若しくは多軸の掘削軸を備えた掘削機を用いて前記地中の汚染土壌層の下にある不透水層まで掘削し、透過性浄化材を充填して不透水層を底盤とする浄化体壁を連続して構築する工程と、
前記各浄化壁の連接部に隣接する前記浄化体内に填り込むように前記地下水浄化ゾーンの方向に平行して矢板を前記不透水槽までそれぞれ建て込む工程と
を備え、
前記浄化壁を連続して構築する工程は、
前記不透水層まで掘削し、透過性浄化材を充填して浄化壁を構築する浄化壁構築手順と、
前記浄化壁構築手順によって構築された浄化壁の隣に前記掘削軸の直径分の距離を隔てた位置を確保する飛ばし手順と
を有し、
前記地下水浄化ゾーンを構築する領域に、前記浄化壁構築手順と前記飛ばし手順とを交互に行い、前記浄化壁を一つ飛ばしに構築した後、前記飛ばし手順で確保した位置に前記浄化壁構築手順を行い、各浄化壁と連続して形成する
ことを特徴とする土壌汚染浄化ゾーン工法。 In the soil pollution purification zone method of constructing a groundwater purification zone that prevents diffusion of contaminants in the contaminated groundwater in the direction crossing the flow direction of the contaminated groundwater into the ground of the downstream basin of the contaminated groundwater,
Drilling to the impervious layer under the contaminated soil layer in the ground using an excavator having a single-axis or multi-axis excavation shaft in the transverse direction, filling with a permeable purification material and impermeable layer A process of continuously constructing a purifier wall with the bottom as a base;
A step of laying a sheet pile up to the impervious tank in parallel with the direction of the groundwater purification zone so as to be embedded in the purification body adjacent to the connecting portion of each purification wall,
The step of continuously constructing the purification wall includes
A purification wall construction procedure for excavating the impermeable layer and filling a permeable purification material to construct a purification wall;
A skipping procedure for securing a position separated by a distance corresponding to the diameter of the excavation shaft next to the purification wall constructed by the purification wall construction procedure;
In the area where the groundwater purification zone is constructed, the purification wall construction procedure and the skipping procedure are alternately performed, and the purification wall construction procedure is performed at the position secured by the skipping procedure after constructing the purification wall one by one. A soil pollution purification zone construction method, characterized in that it is formed continuously with each purification wall. 請求項１又は請求項２記載の土壌汚染浄化ゾーン工法によって構築されたことを特徴とする土壌汚染浄化ゾーン。   A soil contamination purification zone constructed by the soil contamination purification zone construction method according to claim 1 or 2. 請求項１又は請求項２記載の土壌汚染浄化ゾーン工法によって構築された土壌汚染浄化ゾーン又は請求項３記載の土壌汚染浄化ゾーンによる土壌汚染浄化方法において、
前記土壌汚染の浄化確認後に前記矢板を撤去する
ことを特徴とする土壌汚染浄化方法。
In the soil contamination purification zone constructed by the soil contamination purification zone construction method according to claim 1 or claim 2 or the soil contamination purification method by the soil contamination purification zone according to claim 3,
The soil pollution purification method, wherein the sheet pile is removed after confirmation of purification of the soil contamination.
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