JP2002273402A - Purification method of contaminated soil - Google Patents
Purification method of contaminated soilInfo
- Publication number
- JP2002273402A JP2002273402A JP2001075732A JP2001075732A JP2002273402A JP 2002273402 A JP2002273402 A JP 2002273402A JP 2001075732 A JP2001075732 A JP 2001075732A JP 2001075732 A JP2001075732 A JP 2001075732A JP 2002273402 A JP2002273402 A JP 2002273402A
- Authority
- JP
- Japan
- Prior art keywords
- mixing
- contaminated soil
- iron powder
- soil
- stirring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002689 soil Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000000746 purification Methods 0.000 title abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims description 40
- 238000009412 basement excavation Methods 0.000 claims description 25
- 239000003673 groundwater Substances 0.000 claims description 13
- 238000013019 agitation Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 10
- 150000004045 organic chlorine compounds Chemical class 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- 239000000356 contaminant Substances 0.000 description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- UBOXGVDOUJQMTN-UHFFFAOYSA-N 1,1,2-trichloroethane Chemical compound ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- 101100219325 Phaseolus vulgaris BA13 gene Proteins 0.000 description 1
- 101001062854 Rattus norvegicus Fatty acid-binding protein 5 Proteins 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007033 dehydrochlorination reaction Methods 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 trichloroethylene, tetrachloroethylene, 1,3-dichloropropene Chemical class 0.000 description 1
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Fire-Extinguishing Compositions (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、有機塩素系化合物によ
り汚染された土壌の鉄粉による浄化技術に関し、特に、
広範囲に汚染された土壌をその原位置において作業効率
良く経済的に浄化できる、汚染土壌の浄化工法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for purifying soil contaminated with organochlorine compounds using iron powder.
The present invention relates to a method of purifying contaminated soil, which can economically purify soil contaminated in a wide area in situ with high working efficiency.
【０００２】[0002]
【従来の技術】半導体工場や金属加工工場の跡地等にお
ける、有機塩素系化合物による汚染土壌の浄化に鉄粉を
利用する技術は、例えば特開平１１−２３５５７７号公
報等において既に提案されている。該公報に係る汚染物
質の無害化処理方法は、ジクロロメタン、四塩化炭素、
１，２−ジクロロエタン、１，１，１−トリクロロエタ
ン、１，１，２−トリクロロエタン、トリクロロエチレ
ン、テトラクロロエチレン、１，３−ジクロロプロペン
等の揮発性有機塩素系化合物やＰＣＢ、ダイオキシン類
等の有機塩素系化合物により汚染された土壌を浄化する
場合に、鉄粉を用いてこれらの有機塩素系化合物を脱塩
素あるいは脱塩化水素作用により、分解させ無害化する
ものである。2. Description of the Related Art A technique of using iron powder for purifying soil contaminated with an organic chlorine compound at a site of a semiconductor factory or a metal processing factory has already been proposed in, for example, Japanese Patent Application Laid-Open No. 11-235577. The method for detoxifying contaminants according to the publication includes dichloromethane, carbon tetrachloride,
Volatile organic chlorine compounds such as 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene, tetrachloroethylene, 1,3-dichloropropene, and organic chlorine compounds such as PCB and dioxins When purifying soil contaminated with compounds, these organic chlorine compounds are decomposed and made harmless by dechlorination or dehydrochlorination using iron powder.
【０００３】そして、原位置処理の場合には、空気又は
水等による高圧媒体を利用して地中に鉄粉を散布する方
法、地盤改良工事で利用される土木機械を用いて、土壌
に鉄粉を機械的に掘削混合する方法等が示唆されてい
る。また、汚染土壌に対する鉄粉の混合割合を０．１重
量％〜１０重量％の範囲で、浄化すべき全土壌と混合す
ることも示唆されている。[0003] In the case of in-situ treatment, a method of spraying iron powder into the ground by using a high-pressure medium such as air or water, and a method of using a civil engineering machine used for ground improvement work to add iron to soil. A method of mechanically excavating and mixing the powder has been suggested. It is also suggested that iron powder be mixed with all soil to be purified in a mixing ratio of iron powder to contaminated soil in a range of 0.1% by weight to 10% by weight.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記汚染土
壌の原位置処理における土木機械を用いた鉄粉混合方法
を利用した浄化工法の具体的改良であって、広い範囲を
作業効率良く迅速に施工するための、多軸オーガを利用
した浄化工法を提供するものである。また、鉄粉を浄化
土壌の全量と混合するものではなく、原位置地盤の一定
割合部分を掘削することなくそのまま保存し、施工区域
の地盤耐力を維持しながら浄化を行う浄化工法を提供す
るものである。SUMMARY OF THE INVENTION The present invention relates to a concrete improvement of a purification method utilizing an iron powder mixing method using an earthmoving machine in the in situ treatment of the above-mentioned contaminated soil. The purpose of the present invention is to provide a purification method using a multi-axial auger for construction in a building. In addition, instead of mixing iron powder with the entire amount of purified soil, a method is provided in which a fixed percentage of the in-situ ground is preserved without excavation, and purification is performed while maintaining ground strength in the construction area. It is.
【０００５】[0005]
【課題を解決するための手段】本発明は、有機塩素系化
合物によって汚染された土壌の鉄粉混合による浄化工法
であって、多軸オーガを使用して汚染土壌域を掘削する
と同時に、該オーガの掘削ドリル部分から鉄粉を吐出す
ることにより、汚染土壌域に掘削土壌と該鉄粉との撹拌
混合を施す部分と、この様な掘削・撹拌混合を施さない
部分とを設け、該掘削・撹拌混合を施さない部分によっ
て必要な地盤耐力を保持することを特徴とする汚染土壌
の浄化工法であり、該多軸オーガによる汚染土壌域の掘
削・撹拌混合は、各掘削・撹拌混合工程を相互に隣接し
て施工することにより複数の列を形成し、これらの列間
には２ｍ〜５ｍの掘削・撹拌混合を施されない地帯を設
けることを特徴とするものである。また、該多軸オーガ
による汚染土壌域の掘削・撹拌混合は、各掘削・撹拌混
合工程を相互に隔離した位置に施工し、これらの各施工
域の間に夫々２ｍ〜５ｍの掘削・撹拌混合を施されない
地帯を設けることもできる。更に本発明においては、汚
染土壌に撹拌混合される鉄粉を該汚染土壌に地下水が存
在しない場合、掘削土壌に対する混合割合を０．５重量
％〜２．０重量％とし、該汚染土壌に地下水が存在する
場合には掘削土壌に対する混合割合を５重量％〜１０重
量％とすることを特徴とする汚染土壌の浄化工法であ
る。SUMMARY OF THE INVENTION The present invention relates to a method for purifying soil contaminated with an organochlorine compound by mixing iron powder, wherein a multiaxial auger is used to excavate a contaminated soil area and at the same time excavate the contaminated soil. By discharging the iron powder from the excavation drill part of the above, a part for mixing and mixing the excavated soil and the iron powder in the contaminated soil area and a part for not performing such drilling and stirring and mixing are provided. This is a purification method for contaminated soil characterized by maintaining necessary ground strength by a portion not subjected to agitation and mixing. A plurality of rows are formed by constructing adjacent to the area, and a zone of 2 m to 5 m where excavation and stirring and mixing are not performed is provided between these rows. In addition, the excavation / agitation / mixing of the contaminated soil area by the multiaxial auger is performed in a position where the respective excavation / agitation / mixing processes are separated from each other, and the excavation / agitation / mixing of 2 m to 5 m is performed between these construction areas. It is also possible to provide a zone not subjected to the treatment. Further, in the present invention, when ground water does not exist in the contaminated soil, iron powder mixed with the contaminated soil is mixed with excavated soil in a proportion of 0.5% by weight to 2.0% by weight. Is a method for purifying contaminated soil, wherein the mixing ratio to excavated soil is set to 5% by weight to 10% by weight.
【０００６】[0006]
【発明の実施の形態】本発明の実施の形態を図１〜図４
によって説明する。図１及び図２は、本発明の汚染土壌
浄化工法に用いられる三軸のアースオーガとこれを用い
た施工状況の概略説明図である。それ自体は周知の三軸
掘削機本体１を用いて、汚染土壌の浄化区域内の地盤に
鉄粉を掘削混合する場合、図１に示すように、該掘削機
の３本の掘削軸２を回転駆動装置３によって回動し、同
時にその掘削ドリル４の先端から鉄粉を供給する。この
場合、鉄粉の供給は少量の空気と共に行い、例えば通常
の地盤改良に用いられるセメントミルクの場合と同様
に、掘削及び撹拌混合を必要に応じて繰り返すものであ
る。1 to 4 show an embodiment of the present invention.
It will be explained by. FIG. 1 and FIG. 2 are schematic illustrations of a triaxial earth auger used in the method for cleaning contaminated soil according to the present invention and a construction state using the earth auger. When excavating and mixing iron powder into the ground in a purification area for contaminated soil using a well-known triaxial excavator body 1, as shown in FIG. It is rotated by the rotary drive device 3 and simultaneously supplies iron powder from the tip of the drill 4. In this case, iron powder is supplied with a small amount of air, and excavation and stirring and mixing are repeated as necessary, for example, as in the case of cement milk used for ordinary ground improvement.
【０００７】図２は、上記三軸式オーガである掘削機１
を用いて、その施工足場用鉄板５上を紙面左から右へ順
次移動し、連結した３本の掘削孔からなる施工域Ｈ１〜
Ｈ３を掘削する状態を示している。そして、本発明にお
いてはこれらの施工域Ｈｎを、すなわち、３本の掘削軸
２の掘削ドリル４から適宜量の鉄粉を吐出しながら掘削
撹拌した鉄粉混合域である施工域Ｈｎの施工を、後述す
る種々の方法で順次継続し、広い面積の浄化域を経済的
にかつ迅速に施工するものである。FIG. 2 shows an excavator 1 which is the three-axis auger.
With, the construction scaffolding iron plate 5 above sequentially moves from the paper left to right, consisting of three drill holes linked construction zone H 1 ~
Shows a state in which drilling H 3. Then, these construction zone H n in the present invention, i.e., three from Drilling 4 drilling shaft 2 construction zone H n is iron powder mixing zone was drilled stirred while discharging an appropriate amount of iron powder The construction is successively continued by various methods described later, and the purification area of a large area is economically and quickly constructed.
【０００８】図３は、上記三軸式オーガによる一回の掘
削工程において、鉄粉と汚染土壌が撹拌混合される施工
域Ｈｎの大きさを示している。すなわち、同図（Ａ）に
あっては３本の各掘削軸の軸間を４５０ｍｍとし、各ド
リルの径を５５０ｍｍとする場合の一回の施工域Ｈ
ｎを、（Ｂ）にあっては同様に、軸間距離６００ｍｍ、
ドリル径８５０ｍｍの場合の一回の施工域Ｈｎを、同じ
く（Ｃ）にあっては、軸間距離３５０ｍｍ、ドリル径４
５０ｍｍの場合の一回の施工域Ｈｎを夫々表わしてい
る。[0008] Figure 3, in one of the excavation process by the three-shaft auger shows the magnitude of the construction zone H n that iron powder with contaminated soil are stirred and mixed. That is, in the same figure (A), the one work area H in the case where the distance between the three drilling axes is 450 mm and the diameter of each drill is 550 mm.
n , similarly in (B), the distance between the axes is 600 mm,
The single construction zone H n when the drill diameter 850 mm, In the same (C), the center distance 350 mm, drill diameter 4
Once construction zone H n in the case of 50mm each represents.
【０００９】この様にして、一回の掘削・撹拌混合工程
により施工される各施工域Ｈｎの夫々には、例えば掘削
土壌１ｍ３当たりの鉄粉量を、その掘削土壌に地下水が
ない場合には混合割合を約１％前後、同様に地下水が存
在する場合には５〜１０％としている。従って、実際の
鉄粉濃度は被施工土壌域に地下水が存在するか否かによ
って大きく異なり、現場土壌の比重を例えば１．５〜
２．０とすると、地下水のない土壌にあっては約１５ｋ
ｇ／ｍ３〜２０ｋｇ／ｍ３程度の鉄粉を混合し、同様に
地下水が存在する土壌にあっては約７５ｋｇ／ｍ３〜２
００ｋｇ／ｍ３程度の鉄粉を吐出混合するものである。[0009] In this way, respectively of each construction zone Hn which is construction by a single excavation and stirring and mixing process, for example, iron powder per excavated soil 1 m 3, when there is no ground water to the excavated soil Has a mixing ratio of about 1%, and 5 to 10% when groundwater exists. Therefore, the actual iron powder concentration greatly differs depending on whether or not groundwater exists in the soil area to be constructed.
Assuming 2.0, about 15k on soil without groundwater
g / m 3 were mixed to 20 kg / m 3 approximately iron powder, in the soil as well there is groundwater about 75 kg / m 3 to 2
About 00 kg / m 3 of iron powder is discharged and mixed.
【００１０】この様な施工域の土壌重量に対する混合鉄
粉の割合は特に重要であって、後に示す様に、鉄粉と掘
削土壌との混合域すなわち上記施工区域と、非掘削域す
なわち原地盤がそのままの状態で保存される区域との共
存によって、混合鉄粉の割合を多くする替りに必要浄化
面積に対する施工域面積の割合を少なくし、浄化のため
必要な掘削混合作業を量を低減することができるのみな
らず、非掘削域の存在によって施工後の地盤全体の強度
を一定値以上に保持できるからである。The ratio of the mixed iron powder to the soil weight in such an excavated area is particularly important. As will be described later, the mixed area of iron powder and excavated soil, ie, the above-mentioned excavated area, and the non-excavated area, ie, the original ground, Coexistence with the area where it is stored as it is, instead of increasing the proportion of mixed iron powder, reduce the ratio of the construction area to the required purification area, and reduce the amount of excavation and mixing work required for purification Not only that, the strength of the entire ground after construction can be maintained at a certain value or more due to the existence of the non-digging area.
【００１１】図４は、上記の三軸掘削機１を用いて実際
に鉄粉の混合を行う施工域Ｈｎと、その掘削混合作業を
行う手順の種々の態様を示している。同図（Ａ）におい
ては、いわゆるセミラップ方式によってＨ１，Ｈ２，Ｈ
３，Ｈ４，Ｈ５の順に夫々掘削・撹拌混合を行い、先ず
第１の列Ｌ１を施工する。次に該第１の列Ｌ１からαの
距離を隔てた位置に第２の列Ｌ２を、Ｈｎから
Ｈｎ+ １、Ｈｎ+２の順で第１の列と同様にして、上記掘
削・撹拌混合を繰り返し施工するものである。[0011] Figure 4 illustrates various aspects of procedures for the construction zone H n actually performing the mixing of the iron powder using a triaxial excavator 1 of the above, the drilling mixing operation. In FIG. 1A, H 1 , H 2 , H
3, H 4, H in the order of 5 perform respective drilling and stirring mixed, initially applying a first row L 1. Then the second row L 2 at a position spaced a distance α from column L 1 of the first, and from H n the same manner as in the first column in H n + 1, H n + 2 order, The above-mentioned excavation and stirring and mixing are repeatedly performed.
【００１２】この場合に、第１の列Ｌ１において、例え
ばＨ１とＨ２との各施工域は互いに一部重複している
が、その重複部分の面積は僅かであり、一回の掘削混合
工程によって略三軸の掘削軸巾分だけ鉄粉の混合作業が
進行することとなる。そして、第２の列Ｌ２の施工にあ
たっては、図示のごとく第１の列Ｌ１と距離αだけ隔て
て施工されるので、この非施工域である距離αに対応す
る土壌の浄化は、上記施工域又は施工域の列において混
合された鉄粉によって行われることとなる。[0012] In this case, in the first row L 1, for example, the construction area of the H 1 and H 2 are partially overlapping each other, the area of the overlapping portion is small, a single drilling In the mixing step, the mixing operation of the iron powder proceeds by approximately the width of the three-axis excavation shaft. And, when the construction of the second column L 2, since it is construction apart by a first row L 1 and the distance α as shown in the drawing, the purification of soil corresponding to the distance α is the non-construction zone, the It is performed by the iron powder mixed in the construction area or the rows of the construction area.
【００１３】同図（Ｂ）に示す施工手順は、完全ラップ
方式により上記第１、第２に相当する列Ｌ１，Ｌ２を施
工する状態を示している。この場合には、各回の掘削・
混合撹拌工程において三軸の両側の２本の掘削軸は結果
的に相互に重複して施工されることとなり、施工速度は
可成り低下するけれども、掘削方向（垂直方向）の施工
精度が格段に向上するので、非施工域における地盤耐力
の保持がより確実に行われる利点がある。The construction procedure shown in FIG. 1B shows a state in which the rows L 1 and L 2 corresponding to the first and second rows are constructed by a complete wrapping method. In this case, each excavation
In the mixing and agitation process, the two excavation axes on both sides of the three axes are consequently overlapped with each other, and the construction speed is considerably reduced, but the construction accuracy in the excavation direction (vertical direction) is remarkable. Since it is improved, there is an advantage that the ground strength in the non-construction area is more reliably maintained.
【００１４】同図（Ｃ）に示す施工手順はいわゆる単独
方式によるものであって、各施工域Ｈ１〜Ｈｎは相互に
距離αだけ隔たっている。そして、上記と同様に非施工
域の土壌汚染は施工域内に混合された鉄粉により浄化さ
れることとなるが、極めて高い施工速度を得ることがで
きるものである。また、混合される鉄粉の量は一定の範
囲で増減できるので、後述するように、非施工域内の土
壌の汚染物質も充分に分解無害化することができる。The construction procedure shown in FIG. 1C is based on a so-called single system, and the construction areas H 1 to H n are separated from each other by a distance α. Then, similarly to the above, soil contamination in the non-construction area is purified by iron powder mixed in the construction area, but an extremely high construction speed can be obtained. Further, since the amount of iron powder mixed can be increased or decreased within a certain range, as described later, soil contaminants in the non-construction area can be sufficiently decomposed and made harmless.
【００１５】[0015]
【作用】上記の工法による浄化作用について検討すると
次のごときものと考えられる。先ず被施工土壌域に地下
水が存在しない場合には、鉄粉の混合域における土壌中
の汚染物質はこの鉄粉と直接接触することによって、鉄
の還元作用により分解され無害化される。その後、この
還元作用によって有機塩素系化合物の濃度が低下した領
域には、隣接する未還元領域から該汚染化合物が移動
し、そこで還元作用を受けることとなる。この様な汚染
物質の移動は、土壌中の空隙を介して比較的活発な拡散
によって行われるので、例えば上記各列間の又は各施工
域間の距離αを所定値以下にとどめ、且つ、施工域内に
混合される鉄粉の濃度を適宜選定することによって、非
混合域内の汚染物質も充分に無害化することができる。[Effect] When the purification action by the above method is examined, it is considered as follows. First, when there is no groundwater in the soil area to be constructed, the contaminants in the soil in the mixed area of the iron powder are decomposed and detoxified by the reducing action of iron by directly contacting the iron powder. Thereafter, the contaminant compound moves from the adjacent unreduced region to the region where the concentration of the organochlorine compound has been reduced by the reducing action, and is subjected to the reducing action there. Since the movement of such contaminants is performed by relatively active diffusion through voids in the soil, for example, the distance α between the rows or between the construction areas is kept to a predetermined value or less, and By appropriately selecting the concentration of the iron powder mixed in the region, the pollutants in the non-mixed region can be sufficiently rendered harmless.
【００１６】一方、被施工土壌域に地下水が存在する場
合には、この地下水によって汚染物質の移動速度が遅く
なる点に注意する必要がある。上記汚染物質の水中にお
ける拡散速度が低下するために、本発明においては鉄粉
の混合割合を高くし、これにより非混合域内の汚染物質
も無害化することとしている。そして、その鉄粉の混合
割合は地下水が存在しない土壌の場合に比べて約５〜１
０倍の濃度とするものである。On the other hand, when groundwater is present in the soil area to be constructed, it is necessary to pay attention to the fact that this groundwater slows down the moving speed of pollutants. In order to reduce the diffusion rate of the above contaminants in water, in the present invention, the mixing ratio of iron powder is increased, whereby the contaminants in the non-mixed area are also rendered harmless. The mixing ratio of the iron powder is about 5 to 1 compared to the case of the soil where no groundwater exists.
The density is set to 0 times.
【００１７】[0017]
【実施例】上記図４（Ａ）に示すような掘削混合作業の
手順に従って、各施工域Ｈｎの列をセミラップ方式によ
り施工した例を示すと、上記距離αの値を３０００ｍｍ
として、この場合に使用した三軸オーガの掘削軸は、図
３（Ａ）に示す各軸間距離４５０ｍｍ、ドリルの径５５
０ｍｍの大きさのものを用いた。この様な条件により本
発明を実施すると、一列当たり１０回の掘削・撹拌混合
工程により約１３ｍの巾を施工することができ、この様
な列を各列間で３０００ｍｍ離間して５回施工すること
によって、約１８ｍの長さの地盤を浄化施工することが
できた。そして、地下水の存在しない地盤深さ５ｍの区
域を施工するために必要な鉄粉の総量は、約１５０ｋｇ
であった。According EXAMPLES Procedure drilling mixing operation as shown in FIG. 4 (A), when showing an example of construction of the columns of each construction zone H n by Semirappu method, the value of the distance alpha 3000 mm
The drill axis of the triaxial auger used in this case is as follows: the distance between the axes is 450 mm and the diameter of the drill is 55 mm as shown in FIG.
One having a size of 0 mm was used. When the present invention is carried out under such conditions, a width of about 13 m can be constructed by the excavation / mixing process of 10 times per row, and such rows are constructed 5 times with 3000 mm apart between each row. As a result, the ground having a length of about 18 m could be purified. And the total amount of iron powder required to construct an area with a ground depth of 5 m where there is no groundwater is about 150 kg.
Met.
【００１８】[0018]
【発明の効果】本発明の浄化工法によれば、全ての汚染
土壌域に対して鉄粉を掘削・撹拌混合する必要がないた
めに極めて作業効率が良く、経済的であるばかりでな
く、掘削・撹拌混合を施さない地帯を多く存在させるこ
とにより、浄化工事施工地域の地盤強度を可成り高く保
存することができ、浄化工事施工後の種々の作業にも支
障を来さない等の効果を奏するものである。According to the purification method of the present invention, it is not necessary to excavate and mix and mix iron powder in all the contaminated soil areas, so that the work efficiency is extremely high and economical.・ By having many zones that are not subjected to agitation and mixing, the ground strength in the area where the purification work is performed can be preserved at a considerably high level, and various effects after the construction work are not hindered. To play.
【図１】三軸式アースオーガの側面図である。FIG. 1 is a side view of a triaxial earth auger.
【図２】三軸式アースオーガによって掘削及び撹拌混合
を施す部位の説明図である。FIG. 2 is an explanatory diagram of a portion where excavation and stirring and mixing are performed by a triaxial earth auger.
【図３】掘削・撹拌混合域を示すパターンの説明図であ
る。FIG. 3 is an explanatory diagram of a pattern showing an excavation / mixing mixed area.
【図４】浄化工事施工パターンの説明図である。FIG. 4 is an explanatory diagram of a purification work execution pattern.
１ 掘削機 ２ 掘削軸 ３ 回転駆動装置 ４ 掘削ドリル Ｈｎ 施工域 Ｌ１，Ｌ２ 施工域の列1 excavator 2 excavating shaft 3 rotation driving device 4 Drilling H n construction zone L 1, L 2 construction zone column of
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｃ０９Ｋ 101:00 (72)発明者 濱本 信雄 東京都千代田区岩本町３−１−２ 成幸工 業株式会社東京支店内 Ｆターム(参考） 2E191 BA12 BA13 BB01 BC01 BD11 4D004 AA41 AB06 AB07 CA15 CA37 CB24 CC11 DA02 DA03 DA11 4H026 AA01 AB04 Continued on the front page (51) Int.Cl. 7 Identification FI FI Theme Court II (Reference) // C09K 101: 00 (72) Inventor Nobuo Hamamoto 3-1-2 Iwamotocho, Chiyoda-ku, Tokyo Naruyuki Kogyo Co., Ltd. F term in the branch (reference) 2E191 BA12 BA13 BB01 BC01 BD11 4D004 AA41 AB06 AB07 CA15 CA37 CB24 CC11 DA02 DA03 DA11 4H026 AA01 AB04
Claims (5)
壌の鉄粉混合による浄化工法であって、多軸オーガを使
用して汚染土壌域を掘削すると同時に、該オーガの掘削
ドリル部分から鉄粉を吐出することにより、汚染土壌域
に掘削土壌と鉄粉との撹拌混合を施す部分と、この様な
掘削・撹拌混合を施さない部分とを設け、該掘削・撹拌
混合を施さない部分によって必要な地盤耐力を保持する
ことを特徴とする汚染土壌の浄化工法。1. A method of cleaning soil contaminated with an organochlorine compound by mixing iron powder, wherein a multiaxial auger is used to excavate a contaminated soil area, and at the same time, iron powder is removed from a drilling drill portion of the auger. By discharging, a portion for mixing and mixing excavated soil and iron powder in the contaminated soil area and a portion for not performing such excavation / stirring / mixing are provided. A method for purifying contaminated soil, characterized by maintaining ground strength.
削・撹拌混合は、各掘削・撹拌混合工程を相互に隣接し
て施工することにより複数の列を形成し、これらの列間
には２ｍ〜５ｍの掘削・撹拌混合を施されない地帯を設
けることを特徴とする請求項１記載の汚染土壌の浄化工
法。2. The excavation / agitation / mixing in the contaminated soil area by the multiaxial auger forms a plurality of rows by performing each excavation / agitation / mixing step adjacent to each other, and a plurality of rows are formed between these rows. 2. The method for purifying contaminated soil according to claim 1, wherein a zone of 2 m to 5 m where excavation and stirring and mixing are not performed is provided.
削・撹拌混合は、各掘削・撹拌混合工程を相互に隔離し
た位置に施工し、これらの各施工域の間に夫々２ｍ〜５
ｍの掘削・撹拌混合を施されない地帯を設けることを特
徴とする請求項１記載の汚染土壌の浄化工法。3. The excavation / agitation / mixing in the contaminated soil area by the multiaxial auger is performed in a position where the respective excavation / agitation / mixing steps are separated from each other, and 2 m to 5 m is provided between the respective construction areas.
2. The method for purifying contaminated soil according to claim 1, wherein a zone where excavation and stirring and mixing are not performed is provided.
該汚染土壌に地下水が存在しない場合、掘削土壌に対す
る混合割合を０．５重量％〜２．０重量％とすることを
特徴とする請求項１〜３のいずれかに記載の汚染土壌の
浄化工法。4. The iron powder stirred and mixed with the contaminated soil,
The method according to any one of claims 1 to 3, wherein when groundwater is not present in the contaminated soil, a mixing ratio with respect to the excavated soil is set to 0.5% by weight to 2.0% by weight. .
該汚染土壌に地下水が存在する場合に、掘削土壌に対す
る混合割合を５重量％〜１０重量％とすることを特徴と
する請求項１〜３のいずれかに記載の汚染土壌の浄化工
法。5. The iron powder stirred and mixed with the contaminated soil,
The method according to any one of claims 1 to 3, wherein when groundwater is present in the contaminated soil, a mixing ratio with respect to the excavated soil is set to 5% by weight to 10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001075732A JP2002273402A (en) | 2001-03-16 | 2001-03-16 | Purification method of contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001075732A JP2002273402A (en) | 2001-03-16 | 2001-03-16 | Purification method of contaminated soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002273402A true JP2002273402A (en) | 2002-09-24 |
Family
ID=18932764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001075732A Pending JP2002273402A (en) | 2001-03-16 | 2001-03-16 | Purification method of contaminated soil |
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| Country | Link |
|---|---|
| JP (1) | JP2002273402A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005161166A (en) * | 2003-12-01 | 2005-06-23 | Ohbayashi Corp | Method for in-situ cleaning of contaminated soil by water passing |
| CN103624080A (en) * | 2013-11-18 | 2014-03-12 | 东南大学 | Microbial contaminated soil remediation method and remediation pile thereof |
| CN104624632A (en) * | 2015-01-26 | 2015-05-20 | 东南大学 | Remediation method for hexavalent chromium polluted soil and underground water |
| CN104624629A (en) * | 2014-12-26 | 2015-05-20 | 东南大学 | Method for remedying organism contaminated field by using bidirectional stirring injection method |
-
2001
- 2001-03-16 JP JP2001075732A patent/JP2002273402A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005161166A (en) * | 2003-12-01 | 2005-06-23 | Ohbayashi Corp | Method for in-situ cleaning of contaminated soil by water passing |
| CN103624080A (en) * | 2013-11-18 | 2014-03-12 | 东南大学 | Microbial contaminated soil remediation method and remediation pile thereof |
| CN104624629A (en) * | 2014-12-26 | 2015-05-20 | 东南大学 | Method for remedying organism contaminated field by using bidirectional stirring injection method |
| CN104624632A (en) * | 2015-01-26 | 2015-05-20 | 东南大学 | Remediation method for hexavalent chromium polluted soil and underground water |
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