JP5770976B2 - Soil purification method - Google Patents
Soil purification method Download PDFInfo
- Publication number
- JP5770976B2 JP5770976B2 JP2010071674A JP2010071674A JP5770976B2 JP 5770976 B2 JP5770976 B2 JP 5770976B2 JP 2010071674 A JP2010071674 A JP 2010071674A JP 2010071674 A JP2010071674 A JP 2010071674A JP 5770976 B2 JP5770976 B2 JP 5770976B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- casing
- sand
- water
- mat layer
- 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.)
- Active
Links
- 238000000746 purification Methods 0.000 title claims description 33
- 239000002689 soil Substances 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 20
- 239000004576 sand Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 239000012629 purifying agent Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 6
- 239000000356 contaminant Substances 0.000 claims description 2
- 238000005067 remediation Methods 0.000 claims description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 27
- 239000004575 stone Substances 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000012459 cleaning agent Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 235000015097 nutrients Nutrition 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 239000012855 volatile organic compound Substances 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Processing Of Solid Wastes (AREA)
Description
本発明は、原位置で汚染土壌を浄化する土壌浄化杭を造成する土壌浄化工法に関する。 The present invention relates to a soil purification method for creating a soil purification pile that purifies contaminated soil in situ.
地下に浸透したベンゼンやＶＯＣｓ（揮発性有機化合物）の汚染対策として、スパージング井戸や吸引井戸を用いて実施するエアースパージング工法やバイオスパージング工法などがある。また、ベンゼンやＶＯＣｓの汚染対策として深層混合処理機を用いてフェントン薬剤を吐出させ、混合攪拌する攪拌式フェントン法などが知られている。さらに、地中に鉛直に揚水井戸や注入井戸を設置して、注入井戸から浄化剤（浄化用の薬剤）を注入し、揚水井戸から揚水することで、地下の帯水層に地下水の流れを作り、この流れを利用して、土中汚染領域を浄化する方法なども知られている（例えば、特許文献１参照）。 As countermeasures against contamination of benzene and VOCs (volatile organic compounds) that have penetrated underground, there are an air sparging method and a bio sparging method that are performed using a sparging well and a suction well. Further, as a countermeasure against contamination of benzene and VOCs, an agitation type Fenton method is known in which a Fenton drug is discharged using a deep-layer mixing processor and mixed and stirred. Furthermore, by installing a pumping well or injection well vertically in the ground, injecting a purification agent (purifying agent) from the injection well, and pumping water from the pumping well, the flow of groundwater into the underground aquifer A method of making and purifying a soil-contaminated area using this flow is also known (see, for example, Patent Document 1).
ところで、上述したエアースパージング工法やバイオスパージング工法の適用が可能な地盤であっても、もともと液状化しやすい地盤においては、建築計画がある場合、それらの工法により浄化後にあらためて液状化対策などの地盤改良が必要であった。また、上述した従来の攪拌式フェントン法などの地盤を直接混合し浄化する方法は、汚染土の浄化に関しては効果が得られるものの、同時に地盤強度が低下してしまい、もともと液状化が問題とならない地盤であっても、浄化により地盤が緩められて液状化しやすい地盤となってしまうことがあった。この場合は、浄化完了後に改めて地盤改良が必要であった。 By the way, even if the ground is applicable to the above-mentioned air sparging method or biosparging method, if there is a building plan in the ground that is originally liable to be liquefied, the ground improvement such as liquefaction measures can be renewed after purification by those methods. Was necessary. In addition, the method of directly mixing and purifying the ground such as the conventional stirring type Fenton method described above is effective for the purification of contaminated soil, but at the same time the ground strength is lowered, and liquefaction is not a problem originally. Even if it is the ground, the ground may be loosened by purification and become a liquefied ground. In this case, it was necessary to improve the ground after the completion of purification.
本発明は、上記事情を考慮し、ベンゼンやシアン等による地下汚染の浄化を、地盤強度を弱めることなく行うことができ、あるいは、浄化と液状化対策等の地盤強化が同時に可能な土壌浄化杭を造成する土壌浄化工法を提供することを目的とする。 In consideration of the above circumstances, the present invention is a soil purification pile that can purify underground pollution by benzene, cyan, etc. without reducing the strength of the ground, or can simultaneously perform ground strengthening such as purification and liquefaction countermeasures. The purpose is to provide a soil remediation method for creating soil.
上記課題を解決するために、請求項１の発明の土壌浄化工法は、汚染物質が存在する地中に地上から鉛直方向に延びる中空ケーシングを挿入して該ケーシングの先端からエアを吐出する第１工程と、前記ケーシングの内部に砂と浄化剤の混合物を投入し、ケーシングを徐々に引き上げながら、前記砂と浄化剤の混合物をケーシングの先端からケーシングを抜いた空間に吐出すると共に、吐出した前記砂と浄化剤の混合物をケーシングの振動等の動作により締固め、最終的に前記ケーシングを完全に地上に引き抜くことで、前記砂と浄化剤の混合物による締固め砂杭を地中に造成する第２工程と、を具備し、前記第１工程の前後に、地表面に前記浄化剤を含ませた透水性マット層を造成し、前記第２工程において前記締固め砂杭を水平方向に間隔をおいて地中に複数本造成し、この各締固め砂杭の地上端を前記透水性マット層に接続させ、かつ、前記透水性マット層内に注入井戸と揚水井戸を配置して、前記地中の汚染水を前記透水性マット層と前記締固め砂杭を通して循環させることを特徴とする。 In order to solve the above-described problem, the soil purification method according to the first aspect of the present invention is a first method in which a hollow casing extending in the vertical direction from the ground is inserted into the ground where the pollutant is present, and air is discharged from the tip of the casing. And the step of charging the sand and the purifying agent into the inside of the casing and gradually discharging the mixture of the sand and the purifying agent to the space where the casing is removed from the front end of the casing The mixture of sand and cleaning agent is compacted by the action of the vibration of the casing, etc., and finally the casing is completely pulled out to the ground. comprising the two steps, and between the before and after the first step, to construct a water-permeable mat layer moistened with the cleaning agent on the ground surface, the compaction sand pile in a horizontal direction in the second step A plurality of the ground sand piles are connected to the permeable mat layer, and an injection well and a pumping well are disposed in the permeable mat layer. the underground contaminated water, characterized in Rukoto circulated through the compaction Sunakui and the water-permeable mat layer.
請求項１の発明によれば、第１工程で、汚染物質が存在する地中に地上から中空ケーシングを挿入して該ケーシングの先端からエアを吐出するようにしているので、この施工時のエア注入により、地盤をベンゼンやシアンの分解菌の活性化に必要な好気性状態にすることができる。また、第２工程では、砂と浄化剤の混合物による締固め砂杭を地中に造成するので、地盤の透水性・透気性の改善を図ることができ、汚染物質分解菌による好気性分解を促進させる環境を作ることができる。
According to the invention of
特に、第１工程の前後に、地表面に浄化剤を含ませた透水性マット層を造成し、第２工程において造成する締固め砂杭の地上端を透水性マット層に接続させるので、透水性マット層を介して水平方向に水分の移動が可能となり、透水性マット層が、鉛直方向に造成してある複数本の砂杭間の連通役を担うことができると共に、汚染水の浄化をより一段と促進させることができる。さらに、透水性マット層内に注入井戸と揚水井戸を配置して、地中の汚染水を透水性マット層と締固め砂杭を通して循環させるので、汚染水の浄化を更により一層促進させることができる。 In particular , before and after the first step, a water permeable mat layer containing a cleaning agent is formed on the ground surface, and the ground end of the compacted sand pile formed in the second step is connected to the water permeable mat layer. Moisture can be moved in the horizontal direction through the permeable mat layer, and the water-permeable mat layer can serve as a communication between the multiple sand piles formed in the vertical direction, and can purify contaminated water. It can be further promoted. Furthermore, since the injection well and the pumping well are arranged in the permeable mat layer and the contaminated water in the ground is circulated through the permeable mat layer and the compacted sand pile, the purification of the contaminated water can be further promoted. it can.
以下、本発明の実施形態を図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図１は実施形態の土壌浄化杭を施工する場合の第１工程の前工程で浄化剤を含んだ透水性マット層としての砕石マット層を造成した状態を示す図、図２は同第１の工程において、ケーシングを地中に挿入しエアを吐き出している状態を示す図、図３は同土壌浄化杭を施工する場合の第２工程を実施している状態を示す図、図４は完成した実施形態の土壌浄化杭の断面図である。 FIG. 1 is a diagram showing a state in which a crushed stone mat layer as a water permeable mat layer containing a purifying agent is formed in the previous step of the first step when constructing the soil purification pile of the embodiment, and FIG. In the process, the figure which shows the state which inserts the casing in the ground and exhales air, FIG. 3 is the figure which shows the state which is implementing the 2nd process in the case of constructing the soil purification pile, FIG. 4 was completed It is sectional drawing of the soil purification pile of embodiment.
本実施形態の土壌浄化杭を施工する場合は、予め施工前に、適切な配置で揚水井戸やガス吸引井戸（いずれも図示略）を設置しておき、ガス吸引井戸及び揚水井戸から、ベンゼン等の汚染物質の分解・回収ができるにしておく。そして、図１に示すように、栄養剤や酸素除放剤（これらは浄化剤に相当する）を添加混合した透水性のある足場材料としての砕石マット層（透水性マット層）２を地表面１に造成する。 When constructing the soil purification pile of this embodiment, before construction, a pumping well and a gas suction well (both not shown) are installed in advance, and from the gas suction well and the pumping well, benzene, etc. Make it possible to decompose and recover the pollutants. As shown in FIG. 1, a crushed stone mat layer (water permeable mat layer) 2 as a water-permeable scaffold material mixed with a nutrient and an oxygen release agent (which corresponds to a purifying agent) is grounded. Create one.
次に、第１工程として、図２に示すように、地表面１の足場を兼ねた砕石マット層２を貫通させて、エアー４を先端から吐出させながら、中空ケーシング３を鉛直に地中に挿入していく。この場合のエアー４の吐出は、エアースパージング効果を発揮できるように適正に制御して行う。このエアースパージングにより不飽和土壌中に揮散したガスは、ガス吸引井戸等で回収する。
Next, as shown in FIG. 2, as shown in FIG. 2, the
次に、第２工程として、図３に示すように、砂（本明細書では、砂または砕石を含む意味で使う）に栄養剤と酸素除放剤（浄化剤）を混合した混合物１１を、地上機１０を通してケーシング３の内部にその上端から投入し、ケーシング３を徐々に引き上げながら、砂と浄化剤の混合物１１をケーシング３の先端からケーシング３を抜いた空間に吐出すると共に、吐出した砂と浄化剤の混合物１１をケーシング３の振動等の動作により締固め、最終的にケーシング３を完全に地上に引き抜くことで、砂と浄化剤の混合物１１による締固め砂杭１５を地中に造成する（完成した締固め砂杭を図中符号１８で示す）。
Next, as a second step, as shown in FIG. 3, a
このような締固め砂杭１５は、完成すれば個々に土壌浄化杭として機能することになり、図４に示すように、複数本の締固め砂杭１８が水平方向に間隔をおいて地中に造成された上で、各締固め砂杭１８の地上端が、地表面に造成された砕石マット層２に接続されることで、土壌浄化杭が構成されている。
When such compacted
このように施工を行った場合、施工時のエア注入により、地盤をベンゼンやシアンの分解菌の活性化に必要な好気性状態にすることができるので、浄化を促進させることができる。また、締固め砂杭１５，１８を地盤中に打設することにより、地盤の透水性・透気性の改善が図れるために、好気性分解を促進する環境ができ、ベンゼンやシアンの分解菌を活性化させ浄化を促進することができる。さらに、締固め砂杭１５，１８の材料中に汚染物質を無害化する浄化剤を含ませているので、周囲の地盤中の汚染水が浄化剤混合の砂杭に集まり、これを通して排出する過程でも浄化を行うことができる締固め砂杭１５，１８の周辺地盤の汚染を浄化することができ、一群の締固め砂杭１５，１８の施工により、施工した範囲全体を浄化することができる。
When construction is performed in this way, the ground can be brought into an aerobic state necessary for activation of benzene and cyanide-degrading bacteria by injecting air during construction, so that purification can be promoted. In addition, by placing the compacted
また、振動締固めによる締固め砂杭１５，１８の造成により、確実な液状化防止効果も得られる。さらに、締固め砂杭１５，１８は、砂や砕石に栄養剤や酸素除放剤などの浄化剤を混合したもので構成されているので、砂杭１５，１８中に混合された栄養剤と酸素除放剤により、砂杭周辺の原地盤の微生物の活性化を図ることができ、ベンゼン、シアンの分解能力を高めることができ、周囲地盤の汚染を無害化することができる（図４中符号６が無害化領域である）。
In addition, a reliable liquefaction prevention effect can be obtained by forming the compacted
また、地盤の圧密により生じる過剰な間隙水圧により、地盤中の地下水は透水性の良い締固め砂杭１５，１８を通して排出されるため、浄化が促進される。この際、移動した排水８は、砕石マット層２の周囲に形成された集水堰９に集水されて浄化処理されるので、確実な浄化が可能となる。さらに、揚水井戸を砂杭施工時に併用することが可能であり、その場合は、締固め時の過剰間隙水圧を速やかに消散させ、締固め効果を一層向上させることができる。
In addition, due to the excessive pore water pressure generated by the consolidation of the ground, the groundwater in the ground is discharged through the compacted
なお、ベンゼンやシアンによる汚染対象に限らず、好気性分解が可能な油や揮発性有機化合物（ＶＯＣｓ）等の汚染対象にも本発明は適用することができる。 Note that the present invention can be applied not only to benzene and cyan pollutants but also to pollutants such as oil and volatile organic compounds (VOCs) that can be aerobically decomposed.
また、メンテナンスの際には、必要に応じて、図５に示すように、追加栄養剤や酸素除放剤や溶存酸素水２０などを注入井戸１９から再添加するようにすれば、効果を持続させることができる。
In addition, when maintenance is performed, if necessary, additional nutrients, oxygen release agents, dissolved
さらに、図６に示すように、注入井戸２８と揚水井戸２６を適切に配置して、汚染地下水（地中の汚染水）をまんべんなく循環させることにより、浄化機能付きの締固め砂杭１８と浄化機能付き砕石マット層２を通して、汚染水の浄化を更により一層促進させることができる。なお、図６中符号２５は水処理プラント、符号２７は薬剤プラントである。その場合、吸引と微生物処理による汚染土壌対策、汚染地下水対策とを併用できるので、コスト削減が可能である。
Furthermore, as shown in FIG. 6, the injection well 28 and the pumping well 26 are appropriately arranged, and the contaminated groundwater (contaminated water in the ground) is circulated evenly, so that the compacted
１ 地表面
２ 砕石マット層（浄化剤を含んだ透水性マット層）
３ ケーシング
４ エアー
１１ 砂と栄養剤と酸素除放剤（浄化剤）の混合物
１５，１８ 締固め砂杭
3
Claims (1)
前記第１工程の前後に、地表面に前記浄化剤を含ませた透水性マット層を造成し、前記第２工程において前記締固め砂杭を水平方向に間隔をおいて地中に複数本造成し、この各締固め砂杭の地上端を前記透水性マット層に接続させ、
かつ、前記透水性マット層内に注入井戸と揚水井戸を配置して、前記地中の汚染水を前記透水性マット層と前記締固め砂杭を通して循環させることを特徴とする土壌浄化工法。
A first step in which a hollow casing extending vertically from the ground is inserted into the ground in which contaminants are present, and air is discharged from the tip of the casing; a mixture of sand and a purifying agent is introduced into the casing; While gradually pulling up, the mixture of the sand and the purifying agent is discharged into the space where the casing is removed from the tip of the casing, and the discharged mixture of the sand and the purifying agent is compacted by an operation such as vibration of the casing. A second step of creating a compacted sand pile in the ground by extracting the casing completely to the ground ,
Before and after the first step, a water-permeable mat layer containing the purification agent is formed on the ground surface, and a plurality of the compacted sand piles are formed in the ground at horizontal intervals in the second step. And connecting the ground end of each compacted sand pile to the water permeable mat layer,
And said water-permeable injection wells into the mat layer and the pumping wells arranged, soil remediation method according to claim Rukoto by circulating polluted water in the ground through the compaction Sunakui and the water-permeable mat layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010071674A JP5770976B2 (en) | 2010-03-26 | 2010-03-26 | Soil purification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010071674A JP5770976B2 (en) | 2010-03-26 | 2010-03-26 | Soil purification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2011200813A JP2011200813A (en) | 2011-10-13 |
| JP5770976B2 true JP5770976B2 (en) | 2015-08-26 |
Family
ID=44878118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010071674A Active JP5770976B2 (en) | 2010-03-26 | 2010-03-26 | Soil purification method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5770976B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6055233B2 (en) * | 2012-08-10 | 2016-12-27 | 株式会社熊谷組 | Contaminated soil purification equipment |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2535485B2 (en) * | 1992-10-13 | 1996-09-18 | 中富 栗本 | Sand drain placing device |
| JP3895822B2 (en) * | 1997-03-04 | 2007-03-22 | 株式会社フジタ | Purification method for contaminated ground |
| JP3975239B2 (en) * | 1998-05-28 | 2007-09-12 | エスペック株式会社 | Contaminated groundwater purification method and apparatus |
| JP2000263068A (en) * | 1999-03-19 | 2000-09-26 | Taisei Corp | Permeable ground water purifying wall and ground water purifying wall |
| JP4600615B2 (en) * | 2000-06-15 | 2010-12-15 | あおみ建設株式会社 | Ground improvement method to purify contaminated soil |
| JP3658302B2 (en) * | 2000-09-01 | 2005-06-08 | 不動建設株式会社 | Purification method for contaminated ground |
| JP3718153B2 (en) * | 2001-10-15 | 2005-11-16 | 不動建設株式会社 | Hollow pipe for sand pile construction and rectangular sand pile construction method |
| JP4375000B2 (en) * | 2003-12-01 | 2009-12-02 | 株式会社大林組 | In-situ water purification method for contaminated soil |
| JP2005349361A (en) * | 2004-06-14 | 2005-12-22 | Fuji Kiso Kogyo Kk | Contaminated soil improvement method |
-
2010
- 2010-03-26 JP JP2010071674A patent/JP5770976B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011200813A (en) | 2011-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20030087915A (en) | Method for purifying a layer of contaminated soil and apparatus | |
| JP5205010B2 (en) | In-situ purification method for contaminated groundwater | |
| JP2002143828A (en) | Countermeasure method for cleaning of soil and soil cleaning system | |
| JP5770976B2 (en) | Soil purification method | |
| JP4010793B2 (en) | How to repair contaminated soil | |
| JP3975239B2 (en) | Contaminated groundwater purification method and apparatus | |
| JP5063115B2 (en) | How to remove pollutants from contaminated soil | |
| JP2003010832A (en) | Polluted soil cleaning method | |
| JP3658302B2 (en) | Purification method for contaminated ground | |
| KR101155388B1 (en) | Restoration system for contaminated soil using eco-friendly horizontal bio degradable drain board and restoration method for contaminated soil using the same | |
| JP2006320842A (en) | Method and device for cleaning contaminated soil | |
| JP3930785B2 (en) | Contaminated strata purification method and polluted strata purification system used therefor | |
| JP5603097B2 (en) | Purification method for underground oil contaminated part | |
| JP2008093499A (en) | Polluted soil purifying method and soil pile | |
| JP3897553B2 (en) | Construction method of underground purification wall | |
| CN102225423B (en) | Microporous diffuser and method for treating petroleum pollutant | |
| JP2002001296A (en) | Method for decontaminating contaminated ground and strengthening ground at the same time | |
| JP3724967B2 (en) | How to repair contaminated soil | |
| JP4036386B1 (en) | Purification method | |
| JP3374232B2 (en) | How to restore contaminated groundwater and soil | |
| JP2009006265A (en) | Soil treatment system | |
| JP4177155B2 (en) | Purification body construction method | |
| JPH10230243A (en) | Method for purifying polluted soil and ground water by microorganisms and device therefor | |
| JP4600615B2 (en) | Ground improvement method to purify contaminated soil | |
| JP6312409B2 (en) | How to prevent re-contamination of sections with soil contamination countermeasures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20130208 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20140128 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20140324 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20141202 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20150127 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20150623 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20150626 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5770976 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |