JP2001214453A - Method of enclosing underground contaminant by cutoff wall - Google Patents

Method of enclosing underground contaminant by cutoff wall

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Publication number
JP2001214453A
JP2001214453A JP2000059577A JP2000059577A JP2001214453A JP 2001214453 A JP2001214453 A JP 2001214453A JP 2000059577 A JP2000059577 A JP 2000059577A JP 2000059577 A JP2000059577 A JP 2000059577A JP 2001214453 A JP2001214453 A JP 2001214453A
Authority
JP
Japan
Prior art keywords
impermeable
depth
flow
groundwater
underground
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.)
Granted
Application number
JP2000059577A
Other languages
Japanese (ja)
Other versions
JP3598342B2 (en
Inventor
Hiroshi Miki
博史 三木
Ichiji Furumoto
一司 古本
Chikashi Yamamoto
親志 山本
Masahiko Kuwabara
正彦 桑原
Kenji Harada
健二 原田
Tatsuya Ogishima
達也 荻島
Hideki Ishida
英毅 石田
Shigeki Yoshihara
重記 吉原
Masaaki Kubo
正顕 久保
Akio Saraumi
章雄 皿海
Hiroo Morita
博夫 森田
Shinsaku Okamoto
真作 岡本
Hideki Iwata
秀樹 岩田
Original Assignee
Public Works Research Institute Ministry Of Land Infrastructure & Transport
国土交通省土木研究所長
Public Works Research Center
財団法人土木研究センター
Fudo Constr Co Ltd
不動建設株式会社
Shimizu Corp
清水建設株式会社
Honmagumi:Kk
株式会社本間組
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Public Works Research Institute Ministry Of Land Infrastructure & Transport, 国土交通省土木研究所長, Public Works Research Center, 財団法人土木研究センター, Fudo Constr Co Ltd, 不動建設株式会社, Shimizu Corp, 清水建設株式会社, Honmagumi:Kk, 株式会社本間組 filed Critical Public Works Research Institute Ministry Of Land Infrastructure & Transport
Priority to JP2000059577A priority Critical patent/JP3598342B2/en
Publication of JP2001214453A publication Critical patent/JP2001214453A/en
Application granted granted Critical
Publication of JP3598342B2 publication Critical patent/JP3598342B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a method of enclosing underground contaminants by cutoff walls. SOLUTION: Movements of ground water where a contaminant 1 is eluted are slowed by installing cutoff walls 3 which surround the contaminant 1 under the ground and do not reach an impermeable layer 2 and by slowing the flow velocity of the underground water in an inside 4. The flow velocity of the underground water at a specific place of the inside 4 is adjusted by changing either/both of an installing width B for cutoff walls 3 which are perpendicular to the flow of the underground water or/and an installing depth H. Since the flow velocity of the underground water at the specific place of the inside 4 is constant when the ratio of the installing width B to the installing depth H is constant, a plan depending on a nomogram using the formula can be made.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明が属する技術分野】本発明は、遮水壁による地中
汚染物質の封じ込め方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 method for containing underground pollutants by using impermeable walls.
【0002】[0002]
【従来の技術】地中の汚染物質は、通常、地下水に溶出
して地下水とともに移動して拡散してゆくが、これを地
中の特定の範囲に止めておくために、従来は、汚染物質
の周りを不透水層に達する鉛直遮水壁で囲み、該鉛直遮
水壁の内外間の地下水の移動を完全に遮断するという手
段が採られており、これは、汚染物質が追って処理され
る予定で、汚染物質をその処理が済むまでの限られた期
間だけ限られた範囲に留めておけばよい場合でも同様で
あった。
2. Description of the Related Art Underground contaminants usually elute into groundwater and travel with and diffuse with groundwater. Is surrounded by a vertical impermeable wall that reaches the impermeable layer, and measures are taken to completely block the movement of groundwater between the inside and the outside of the vertical impermeable wall, so that pollutants are treated later. The same was true if the contaminants were to be kept within a limited range for a limited period of time until the treatment was completed.
【0003】しかし、前述のようにして汚染物質を完全
に封じ込める従来技術には、不透水層が深い場合に遮水
壁が長くなって工費が増大し、また、地下水流が遮水壁
で遮断されることになって下流側(場合によっては同時
に上流側)に地下水障害が生じる、という問題点があっ
た。
[0003] However, as described above, in the conventional technology for completely contaminating contaminants, if the water-impermeable layer is deep, the impermeable wall becomes long and the construction cost increases, and the groundwater flow is blocked by the impermeable wall. As a result, there is a problem that a groundwater disturbance occurs on the downstream side (in some cases, on the upstream side at the same time).
【0004】[0004]
【発明が解決しようとする課題】本発明が解決しようと
する課題(本発明の目的)は、前述のような問題点がな
く、特に、地中の汚染物質を限られた期間だけ限られた
範囲に留めておく場合に有効な遮水壁による地中汚染物
質の封じ込め方法を提供することにある。
The problem to be solved by the present invention (object of the present invention) does not have the above-mentioned problems, and in particular, limits the amount of underground pollutants for a limited period. It is an object of the present invention to provide a method for containing underground pollutants by impermeable walls that is effective when the area is kept within a range.
【0005】[0005]
【課題を解決するための手段】前記課題を解決するため
に、本発明(請求項1に係る発明)では、地中の汚染物
質を囲んで、不透水層に達しない長さの遮水壁を打設
し、該遮水壁で囲まれた内部の地下水流の流速を低下さ
せて、汚染物質が溶出した地下水の移動を遅らせるよう
にしている。
In order to solve the above problems, according to the present invention (the first aspect of the present invention), a water impermeable wall surrounding an underground contaminant and having a length not reaching an impermeable layer. To reduce the flow velocity of the groundwater flow inside the enclosure surrounded by the impermeable wall, thereby delaying the movement of the groundwater in which the pollutant is eluted.
【0006】そして、請求項1に係る発明に従属する請
求項2に係る発明では、地下水流に直交する方向の遮水
壁の設置幅と遮水壁の打設深さとの何れか一方もしくは
双方を変えて、遮水壁で囲まれた内部の特定部所の地下
水流の流速を調節するようにしている。
In the invention according to the second aspect, which is dependent on the first aspect, one or both of the installation width of the impermeable wall and the installation depth of the impermeable wall in a direction orthogonal to the groundwater flow. To adjust the velocity of the groundwater flow at a specific location inside the enclosure surrounded by impermeable walls.
【0007】本発明者らが解析および実験から得た知見
によると、鉛直遮水壁で囲まれた内部の地下水流の流速
は、上方になるに従って次第に小さくなり、また、鉛直
遮水壁で囲まれた内部の特定部所の地下水流の流速は、
地下水流に直交する方向の鉛直遮水壁の設置幅(間隔)
が小さくなるか、もしくは、鉛直遮水壁の打設深さ(下
端深度)が大きくなると、小さくなる。
According to the findings obtained by the present inventors from analysis and experiments, the velocity of the groundwater flow inside the vertical water impermeable wall gradually decreases as it goes upward, and the flow velocity of the groundwater flow inside the vertical water impermeable wall decreases. The velocity of the groundwater flow at a specific location inside the
Installation width (interval) of vertical impermeable walls in the direction perpendicular to the groundwater flow
Becomes smaller, or becomes smaller when the installation depth (bottom depth) of the vertical impermeable wall is increased.
【0008】そして、地下水流に直交する方向の鉛直遮
水壁の設置幅と鉛直遮水壁の打設深さとの比が一定であ
ると、鉛直遮水壁で囲まれた内部の相対的に同じ箇所の
地下水流の流速は、一定であり、相似性が成立するの
で、これを利用して作成したノモグラムによる設計が可
能となる。
If the ratio between the installation width of the vertical impermeable wall in the direction orthogonal to the groundwater flow and the installation depth of the vertical impermeable wall is constant, the inside of the vertical impermeable wall becomes relatively Since the velocity of the groundwater flow at the same location is constant and similarity is established, it is possible to design using a nomogram created using this.
【0009】なお、前述の遮水壁で囲むことによる地下
水流の流速の低減効果は、遮水壁が鉛直の場合だけでな
く、傾斜している場合にも期待でき、例えば、既設建築
物の下に地中汚染物質があり、既設建築物の側方で鉛直
に遮水壁を打設すると地下水流に直交する方向の遮水壁
の設置幅が大きくなり過ぎるような場合には、遮水壁を
下端が相寄るように傾斜させて遮水壁の下端間の間隔を
狭め、その間隔と遮水壁の下端の深度との比をもとに作
成したノモグラムを用いて、地下水流の流速を所定値に
低減させることができる。
[0009] The effect of reducing the velocity of the groundwater flow by surrounding with the impermeable wall can be expected not only when the impermeable wall is vertical but also when the impermeable wall is inclined. If there is an underground contaminant below, and if the impermeable wall is installed vertically on the side of the existing building, the width of the impermeable wall in the direction orthogonal to the groundwater flow becomes too large, Using a nomogram created based on the ratio of the distance between the lower end of the impermeable wall and the depth of the lower end of the impermeable wall by narrowing the wall so that the lower end is inclined, Can be reduced to a predetermined value.
【0010】[0010]
【発明の実施の形態】本発明の一実施例(遮水壁が鉛直
の場合)の説明図である図1,図2において、1は地中
の汚染物質、2は不透水層、3は遮水壁であり、遮水壁
3は、十分に止水性を有する材料から成り、汚染物質1
を囲んで、不透水層2に達しない深さに垂直に打設され
ている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, which are explanatory views of an embodiment of the present invention (when the impermeable wall is vertical), 1 is an underground pollutant, 2 is an impermeable layer, and 3 is The water impervious wall 3 is made of a material having a sufficient water blocking property, and the contaminant 1
And is vertically driven to a depth that does not reach the impermeable layer 2.
【0011】遮水壁3で囲まれた内部4の地下水流の流
速は、上方になるに従って小さくなり、また、Bを地下
水流(矢印Xの方向に流れる)に直交する方向の遮水壁
3の設置幅、Hを遮水壁3の打設深さとすると、内部4
の特定部所(通常は中心部を考えるが、これに限定され
ない)の地下水流の流速は、設置幅Bが小さくなるか、
もしくは、打設深さHが大きくなると、小さくなる。
The flow velocity of the groundwater flow in the interior 4 surrounded by the water-blocking wall 3 decreases as it goes upward, and B flows in the direction perpendicular to the groundwater flow (flows in the direction of arrow X). If the installation width, H, is the casting depth of the impermeable wall 3,
The groundwater flow velocity at a specific location (usually, but not exclusively, the center) is determined by the
Alternatively, when the driving depth H increases, the driving depth decreases.
【0012】したがって、遮水壁3の設置幅Bと打設深
さHとの何れか一方もしくは双方を変えることにより、
遮水壁3で囲まれた内部4の特定部所の地下水流の流速
を調節することができる。
Therefore, by changing one or both of the installation width B and the casting depth H of the impermeable wall 3,
The flow velocity of the groundwater flow in a specific portion of the interior 4 surrounded by the impermeable wall 3 can be adjusted.
【0013】なお、遮水壁3で囲まれた内部4の特定部
所の地下水流の流速は、遮水壁3がない状態における流
速を1として例えば図3のように相対的に表示すること
ができる。
The flow rate of the groundwater flow in a specific portion of the interior 4 surrounded by the impermeable wall 3 is relatively displayed, for example, as shown in FIG. Can be.
【0014】先にも述べたように、遮水壁3の設置幅B
と打設深さHとの比が一定のとき、内部4の相対的に同
じ箇所の地下水流の流速は一定であるから、このことを
利用して、例えば、図3に示すようなノモグラムを作成
し、これにより、遮水壁3で囲まれた内部4における所
定範囲の地下水流の流速を一定値以下にするための遮水
壁3の設置幅Bと打設深さHを容易に設定することがで
きる。
As described above, the installation width B of the impermeable wall 3 is set.
When the ratio between the depth of the groundwater and the casting depth H is constant, the flow rate of the groundwater flow at the relatively same location in the interior 4 is constant. Therefore, by utilizing this fact, for example, a nomogram as shown in FIG. The installation width B and the installation depth H of the impermeable wall 3 for setting the flow rate of the groundwater flow in a predetermined range in the interior 4 surrounded by the impermeable wall 3 to a predetermined value or less are thereby easily set. can do.
【0015】図3は遮水壁3の打設深さHを10mとし
たときの遮水壁3の設置幅Bと打設深さHとの比が3.
0と2,0と1.0と0.5の場合の各々について、遮
水壁3の設置幅Bの中間位置の各深度Dにおける地下水
流の流速比V/V(ここにVは遮水壁3がない場合
の流速)を算定して作成したものであり、これにより、
例えば、地下水流の流速比が0.1まで低減する範囲を
深度5mまで確保したい場合は、DとHの比が0.5で
あるから、BとHの比が0.5となる遮水壁長を選定で
き、Bを5mに設定すればよいことが判る。
FIG. 3 shows the ratio of the installation width B of the impermeable wall 3 to the installation depth H when the installation depth H of the impermeable wall 3 is 10 m.
For each of 0, 2, 0, 1.0, and 0.5, the velocity ratio V / V 0 of the groundwater flow at each depth D at an intermediate position of the installation width B of the impermeable wall 3 (where V 0 is Flow velocity when there is no impermeable wall 3).
For example, when it is desired to secure a range in which the velocity ratio of the groundwater flow is reduced to 0.1 to a depth of 5 m, the ratio of D to H is 0.5, so that the ratio of B to H becomes 0.5. It can be seen that the wall length can be selected and B should be set to 5 m.
【0016】なお、図3に示すような遮水壁3の打設深
さHを一定にしたノモグラムの外、遮水壁3の設置幅B
を一定にしたノモグラムも作成することができるのは言
うまでもない。
In addition to the nomogram shown in FIG. 3 where the installation depth H of the impermeable wall 3 is constant, the installation width B of the impermeable wall 3 is not limited.
Needless to say, it is also possible to create a nomogram with a constant.
【0017】そして遮水壁が鉛直でない場合でも、地下
水流に直交する方向の遮水壁の下端間の間隔をB、遮水
壁の下端の深度をHとすることにより、前述のノモグラ
ムを利用することができる。
Even when the impermeable wall is not vertical, the above-mentioned nomogram can be used by setting the interval between the lower ends of the impermeable wall in the direction perpendicular to the groundwater flow to B and the depth of the lower end of the impermeable wall to H. can do.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の一実施例を説明するための縦断面図で
ある。
FIG. 1 is a longitudinal sectional view for explaining one embodiment of the present invention.
【図2】同じく水平断面図である。FIG. 2 is a horizontal sectional view of the same.
【図3】鉛直の遮水壁の打設深さを一定にした場合のノ
モグラムの一例図である。
FIG. 3 is an example of a nomogram in a case where the installation depth of a vertical impermeable wall is constant.
【符号の説明】[Explanation of symbols]
1:汚染物質、2:不透水層、3:遮水壁、4:内部、
X:矢印、B:設置幅、H:打設深さ。
1: contaminant, 2: impermeable layer, 3: impermeable wall, 4: inside,
X: arrow, B: installation width, H: casting depth.
フロントページの続き (71)出願人 000002299 清水建設株式会社 東京都港区芝浦一丁目2番3号 (71)出願人 000155034 株式会社本間組 新潟県新潟市西湊町通三ノ町3300番地3 (72)発明者 三木 博史 茨城県つくば市竹園2−35−14 (72)発明者 古本 一司 茨城県つくば市春日1−11−4−204−319 (72)発明者 山本 親志 千葉県我孫子市根戸549−2 (72)発明者 桑原 正彦 千葉県印旛郡白井町桜台2−6−8−501 (72)発明者 原田 健二 山口県宇部市錦町9−6−1301 (72)発明者 荻島 達也 神奈川県横浜市泉区和泉町2021 (72)発明者 石田 英毅 埼玉県越谷市赤山町3−118レピュート大 久保206 (72)発明者 吉原 重記 東京都練馬区春日町5−21−37 (72)発明者 久保 正顕 神奈川県横浜市青葉区松風台13−10アロン ディール203号 (72)発明者 皿海 章雄 神奈川県横浜市青葉区市が尾1481−1ハイ ブリッジ2−207号 (72)発明者 森田 博夫 新潟県新潟市東青山1−16清山荘505号室 (72)発明者 岡本 真作 新潟県新潟市新崎2−2−17 (72)発明者 岩田 秀樹 新潟県新潟市寺山3−10−11−225Continuing from the front page (71) Applicant 000002299 Shimizu Corporation 1-3-3 Shibaura, Minato-ku, Tokyo (71) Applicant 000155034 Honma Gumi Co., Ltd. Inventor Hiroshi Miki 2-35-14 Takezono, Tsukuba, Ibaraki Pref. (72) Inventor Kazuji Furumoto 1-1-11-204-319, Kasuga, Tsukuba, Ibaraki Pref. (72) Inventor Chichi Yamamoto Nedo, Abiko, Chiba 549-2 (72) Inventor Masahiko Kuwahara 2-6-8-501 Sakuradai, Shirai-machi, Inba-gun, Chiba Prefecture (72) Inventor Kenji Harada 9-6-1301, Nishikicho, Ube-shi, Yamaguchi Prefecture (72) Inventor Tatsuya Ogishima Kanagawa Prefecture 2021 Izumi-cho, Izumi-ku, Yokohama (72) Inventor Hideki Ishida 3-118 Akayama-cho, Koshigaya-shi, Saitama 206 Reputate Okubo 206 (72) Inventor Shigeki Yoshihara 5-21-37, Kasuga-cho, Nerima-ku, Tokyo (72) Invention Person Masaaki Kubo 13-10 Aalon Deal No.13-10 Matsufudai, Aoba-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Akio Saraumi 1481- High Bridge 2-207 (72) Inventor Hiroo Morita 1-16 Higashi-Aoyama, Niigata City, Niigata Prefecture Room 505, Kiyoyamaso Room (72) Inventor Masasaku Okamoto 2-2-17 Niizaki, Niigata City, Niigata Prefecture (72) Inventor Hideki Iwata 3-10-11-225 Terayama, Niigata City, Niigata Prefecture

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 地中の汚染物質を囲んで、下方の不透水
    層に達しない長さの遮水壁を打設し、該遮水壁で囲まれ
    た内部の地下水流の流速を低下させて、汚染物質が溶出
    した地下水の移動を遅らせることを特徴とする遮水壁に
    よる地中汚染物質の封じ込め方法。
    1. An impervious wall having a length that does not reach a lower impermeable layer surrounding an underground contaminant is provided, and a flow rate of a groundwater flow inside the enclosed wall is reduced. A method for containing underground pollutants by impermeable walls, which delays the movement of groundwater from which pollutants have eluted.
  2. 【請求項2】 地下水流に直交する方向の遮水壁の設置
    幅と遮水壁の打設深さとの何れか一方もしくは双方を変
    えて、遮水壁で囲まれた内部の特定部所の地下水流の流
    速を調節する請求項1記載の遮水壁による地中汚染物質
    の封じ込め方法。
    2. The method according to claim 1, wherein one or both of the installation width of the impermeable wall and the installation depth of the impermeable wall in a direction orthogonal to the groundwater flow are changed to determine a specific location inside the impermeable wall. The method of claim 1, wherein the flow rate of the groundwater flow is adjusted.
JP2000059577A 2000-01-31 2000-01-31 Methods of containment of underground pollutants by impermeable walls Expired - Lifetime JP3598342B2 (en)

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Publication Number Publication Date
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102367673A (en) * 2011-09-13 2012-03-07 北京高能时代环境技术股份有限公司 Vertical flexible barrier system for remediation of ecological environment
CN102733403A (en) * 2012-02-24 2012-10-17 中国科学院寒区旱区环境与工程研究所 Method for preventing permafrost layer from feeding water to inflow in excavation pit by using waterproof film
CN106677199A (en) * 2015-11-11 2017-05-17 北京高能时代环境技术股份有限公司 Method for vertically laying HDPE geomembranes underground

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1060882A (en) * 1996-08-21 1998-03-03 Kumagai Gumi Co Ltd Impervious structure of groundwater current
JPH10317307A (en) * 1997-05-19 1998-12-02 Dia Consultant:Kk Construction method for road

Patent Citations (2)

* Cited by examiner, † Cited by third party
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CN102733403A (en) * 2012-02-24 2012-10-17 中国科学院寒区旱区环境与工程研究所 Method for preventing permafrost layer from feeding water to inflow in excavation pit by using waterproof film
CN102733403B (en) * 2012-02-24 2015-05-13 中国科学院寒区旱区环境与工程研究所 Method for preventing permafrost layer from feeding water to inflow in excavation pit by using waterproof film
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