JP3450092B2 - How to remove contaminated soil - Google Patents
How to remove contaminated soilInfo
- Publication number
- JP3450092B2 JP3450092B2 JP10883495A JP10883495A JP3450092B2 JP 3450092 B2 JP3450092 B2 JP 3450092B2 JP 10883495 A JP10883495 A JP 10883495A JP 10883495 A JP10883495 A JP 10883495A JP 3450092 B2 JP3450092 B2 JP 3450092B2
- Authority
- JP
- Japan
- Prior art keywords
- contaminated soil
- ground
- inner pipe
- pressurized water
- soil 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.)
- Expired - Fee Related
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、汚染土の除去方法に
関し、特に地中に残置されている汚染土を除去するため
の汚染土の除去方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing contaminated soil, and more particularly to a method for removing contaminated soil for removing contaminated soil left in the ground.
【０００２】[0002]
【従来の技術】埋立て地盤や、工場の跡地等において
は、過去に投棄された一般廃棄物や工場廃棄物等が残置
されている場合があり、これらの廃棄物が、有害物質や
腐食性のある有機物質等を含んでいると、これらによっ
て周囲の地盤が汚染されて地中に汚染土を発生させるこ
とになる。2. Description of the Related Art In a landfill, a site of a factory, etc., there are cases where general waste and factory waste that were dumped in the past are left behind, and these wastes are harmful substances or corrosive. If it contains a certain organic substance, the surrounding ground will be polluted by these, and polluted soil will be generated in the ground.
【０００３】そして、これらの汚染土は周囲の環境に悪
影響を及ぼすおそれがあるとともに、かかる汚染土を含
む地盤は、各種の構造物の基礎地盤としての信頼性に欠
けるものであるため、このような汚染土が地中に存在す
ることが発見された場合には、これを速やかに除去し、
例えばこれを薬剤等を用いて無害化処理することが好ま
しい。These polluted soils may adversely affect the surrounding environment, and the ground containing such polluted soils lacks reliability as the foundation ground for various structures. If it is discovered that a large amount of contaminated soil exists in the ground, promptly remove it,
For example, it is preferable to detoxify this with a drug or the like.
【０００４】そして、このような汚染土の除去方法とし
ては、一般的に、例えば図２に示すように、汚染土層５
０の位置する地盤の周囲を囲んで、地表面から汚染土層
５０より下方に至る深さまで、例えば鋼矢板を地中に打
ち込んで土留壁５１を形成し、この土留壁５１で締め切
られた内部を、切梁り５２を設置して山留め支保工を行
ないながら汚染土層５０のある深さまで掘削するととも
に汚染土層５０を掘削除去し、しかる後に土留壁５１の
内部を埋戻すとともに切梁り５２及び土留壁５１を撤去
して地盤面を復旧する方法が採用されている。As a method for removing such contaminated soil, generally, for example, as shown in FIG. 2, the contaminated soil layer 5 is used.
Surrounding the ground where 0 is located, for example, a steel sheet pile is driven into the ground to form a soil retaining wall 51 to a depth below the soil surface 50 below the contaminated soil layer 50, and the interior is closed by this soil retaining wall 51. Is excavated up to a certain depth of the contaminated soil layer 50 while installing a girder beam 52 and carrying out mountain retaining support, and then the contaminated soil layer 50 is excavated and removed. 52 and the earth retaining wall 51 are removed to restore the ground surface.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来の汚染土の除去方法によれば、汚染土層５０が地中の
浅い位置に存在する場合には、土留壁５１や切梁り５２
の設置作業を省略することができるなど、比較的簡易な
作業によって汚染土を容易に掘削除去することができる
が、その一方で、汚染土層５０が地中の深い位置に存在
する場合には、地盤の崩落防止のための土留壁５１や切
梁り５２等からなる山留め構造を大がかりなものにする
必要を生じるとともに、地下水の対策に手間がかかる場
合もあり、また大規模な掘削、埋戻し作業を必要とする
ことになるため、迅速かつ経済的に汚染土の除去作業を
行なうことができないという課題があった。However, according to the above-mentioned conventional method for removing contaminated soil, when the contaminated soil layer 50 exists at a shallow position in the ground, the retaining wall 51 and the beam girder 52 are provided.
It is possible to easily excavate and remove the contaminated soil by a relatively simple work such as the omission of the installation work of 1. However, when the contaminated soil layer 50 exists at a deep position in the ground, In addition to the need to make a large-scale earth retaining structure consisting of a retaining wall 51 and a girder beam 52 for preventing the collapse of the ground, it may be time-consuming to take measures against groundwater, and large-scale excavation and burial Since the return work is required, there is a problem that the work for removing the contaminated soil cannot be performed quickly and economically.
【０００６】そこで、この発明はかかる従来の課題に着
目してなされたもので、簡易な構成によって迅速かつ経
済的に地中に残置された汚染土を除去することのできる
汚染土の除去方法を提供することを目的とするものであ
る。Therefore, the present invention has been made in view of such conventional problems, and provides a method for removing contaminated soil which can remove contaminated soil left in the ground quickly and economically with a simple structure. It is intended to be provided.
【０００７】[0007]
【課題を解決するための手段】この発明は、上記目的を
達成するためになされたもので、その要旨は、地中に残
置されている汚染土を除去するための方法であって、前
記汚染土層の周囲を囲む締切り壁を鋼矢板等によって地
中に形成した後、外管とこれの内部に挿入された内管と
からなる二重管ロッドを汚染土層に向かって地中に打設
挿入し、一体として前記汚染土層の直上まで打ち込んだ
後、内管のみを外管の下端部から突出させてさらに下方
に打ち込んで前記汚染土層を貫通させ、前記内管に加圧
水を給送して、前記外管の先端より突出配置した前記内
管の先端部から周囲の汚染土層に加圧水を噴射すること
によって汚染土をスラリー化するとともに、前記内管を
徐々に引き抜き、該スラリー化した汚染土を、前記外管
と内管との間の隙間を経て上方に押し上げることによ
り、地上に排出することを特徴とする汚染土の除去方法
にある。The present invention has been made in order to achieve the above object, and the gist thereof is a method for removing contaminated soil left in the ground. After forming a closed wall surrounding the soil layer with steel sheet piles, etc., a double pipe rod consisting of an outer pipe and an inner pipe inserted inside this is driven into the soil toward the contaminated soil layer. It was installed and inserted as a unit into just above the contaminated soil layer.
After that, project only the inner pipe from the lower end of the outer pipe and
By penetrating through the contaminated soil layer, feeding pressurized water to the inner pipe, and jetting pressurized water from the tip of the inner pipe projecting from the tip of the outer pipe to the surrounding contaminated soil layer. Contaminated soil is slurried and the inner pipe is
A method of removing contaminated soil is characterized in that the contaminated soil is gradually drawn out and the slurry-like contaminated soil is discharged to the ground by pushing it upward through a gap between the outer pipe and the inner pipe.
【０００８】また、この発明の汚染土の除去方法は、前
記内管に加圧水に加えて加圧空気を給送し、前記加圧水
を加圧空気とともに汚染土層に噴射することが好まし
い。Further, in the method for removing contaminated soil according to the present invention, it is preferable that pressurized air is fed to the inner pipe in addition to pressurized water, and the pressurized water is jetted into the contaminated soil layer together with the pressurized air.
【０００９】[0009]
【００１０】[0010]
【作用】この発明の汚染土の除去方法によれば、汚染土
層の周囲を囲む締切り壁を鋼矢板等によって地中に形成
した後、二重管ロッドを汚染土層に向かって地中に打設
挿入し、一体として前記汚染土層の直上まで打ち込んだ
後、内管のみを外管の下端部から突出させてさらに下方
に打ち込んで前記汚染土層を貫通させ、内管から加圧水
を汚染土層に噴射することにより汚染土をスラリー化す
るとともに、前記内管を徐々に引き抜き、このスラリー
化した汚染土を、外管と内管との間の隙間を経て上方に
押し上げて地上に排出するだけの簡易な方法により汚染
土を除去する。According to the method for removing contaminated soil according to the present invention, after forming a closed wall surrounding the contaminated soil layer in the ground with a steel sheet pile or the like, the double pipe rod is moved toward the contaminated soil layer toward the ground. It was driven and inserted, and it was driven as a unit up to just above the contaminated soil layer.
After that, project only the inner pipe from the lower end of the outer pipe and
To contaminate the contaminated soil layer by injecting it into the contaminated soil layer by injecting pressurized water from the inner pipe into the contaminated soil layer .
At the same time, the inner pipe is gradually pulled out , and the contaminated soil that has been slurried is removed by a simple method of pushing it up through the gap between the outer pipe and the inner pipe and discharging it to the ground. .
【００１１】すなわち、二重管ロッドは公知の種々の打
設装置を用いて、汚染土層が位置する所定の深度まで容
易に打設挿入することができるとともに、内管を例えば
地上に設けた加圧水圧送ポンプに接続すれば、内管に給
送される加圧水は、例えば内管の先端部分に設けた噴射
ノズルから周囲の汚染土層に向かって高圧噴射され、こ
れにより汚染土を撹拌しつつ容易にスラリー化すること
ができる。そして、スラリー化された汚染土は、地中に
供給される加圧水の供給圧力により、外管と内管との間
の隙間を経て地上に至るまで上方に向かって押し上げら
れ、これによって汚染土が容易かつ速かに地上に排出除
去されることになる。内管から加圧水を噴射することに
よる汚染土のスラリー化は、汚染土層の周囲を囲む締切
り壁を鋼矢板等によって地中に形成した後におこなわれ
るので、汚染土の除去範囲を予め画定して、さらに効率
の良い除去作業を可能にすることができる。 That is, the double pipe rod can be easily inserted and inserted to a predetermined depth where the contaminated soil layer is located by using various known placing devices, and the inner pipe is provided on the ground, for example. If it is connected to a pressurized water pressure pump, the pressurized water fed to the inner pipe is, for example, injected at high pressure toward the surrounding contaminated soil layer from the injection nozzle provided at the tip of the inner pipe, thereby stirring the contaminated soil. It can be easily slurried. Then, the contaminated soil slurried is pushed upward by the supply pressure of the pressurized water supplied to the ground to the ground through the gap between the outer pipe and the inner pipe, whereby the contaminated soil is It will be easily and quickly discharged to the ground. Injecting pressurized water from the inner pipe
Slurry of contaminated soil is a deadline surrounding the contaminated soil layer.
It is carried out after the wall is formed in the ground with steel sheet piles.
Therefore, the removal range of contaminated soil is defined in advance to improve efficiency.
Good removal work can be made possible.
【００１２】また、加圧水に加えて圧空気を内管に給送
して、この加圧空気とともに加圧水を汚染土層に向かっ
て高圧噴射すれば、内管から噴射される加圧水の汚染土
層内における到達距離を増大させることができ、これに
よって一個所の二重管ロッドによる汚染土の除去範囲を
増大して、効率の良い除去作業を可能にすることができ
る。そして、空気の排出によって、スラリーの排出が容
易になる。If, in addition to the pressurized water, pressurized air is fed to the inner pipe and the pressurized water is injected at high pressure toward the contaminated soil layer together with the pressurized air, the pressurized water ejected from the inner pipe is contaminated in the contaminated soil layer. It is possible to increase the reachable distance at, and thereby to increase the removal range of the contaminated soil by the single double pipe rod, and to enable efficient removal work. Then, the discharge of the air facilitates the discharge of the slurry.
【００１３】[0013]
【００１４】[0014]
【実施例】次に、この発明の一実施例を、添付図面を参
照しつつ詳細に説明する。この実施例によれば、図１
（ａ）に示すように、地中に汚染土層１０として残置さ
れた汚染土を除去すべく、汚染土層１０に向かって二重
管ロッド１２を打ち込む作業を行なう前に、予め、汚染
土層１０の周囲を囲むようにして、多数の鋼矢板を連続
的に地中に打ち込んで締切り壁１１を形成する。なお、
この締切り壁１１は、例えばバイブロハンマーを備えた
公知の打設装置を用いて容易に打込み形成することがで
きるとともに、この締切り壁１１は、汚染土を除去する
範囲を画定して効率の良い除去作業を可能にするための
ものである。また、各鋼矢板は、画定された地盤より外
方の地盤に加圧水が噴射されてスラリー化するのを遮断
できる程度の根入れ長があれば良く、したがって汚染土
層１０の位置する深度を僅かに越えてこれの下方まで打
ち込めば良い。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. According to this embodiment, FIG.
As shown in (a), in order to remove the contaminated soil left as the contaminated soil layer 10 in the ground, before performing the operation of driving the double pipe rod 12 toward the contaminated soil layer 10, the contaminated soil is previously prepared. A large number of steel sheet piles are continuously driven into the ground so as to surround the periphery of the layer 10 to form the cutoff wall 11. In addition,
The deadline wall 11, for example it is possible to easily implant formed using a known setting tool having a vibro-hammer over, this deadline wall 11 is efficient to define a range for removing contaminated soil Ru der intended to allow the removal work. Further, each steel sheet pile has only to have a rooting length that can prevent the pressurized water from being sprayed to the ground outside the defined ground to form a slurry, so that the depth at which the contaminated soil layer 10 is located is small. Just cross over and hit down to this.
【００１５】そして、締め切り壁１１を形成したら、汚
染土層１０に向かって二重管ロッド１２を打ち込む作業
を行なう（図１（ｂ）参照）。かかる打ち込み作業は、
例えば薬液注入工法等において二重管形式の注入ロッド
を地中に打ち込む際などに使用する、回転圧入式あるい
は打撃式の公知の種々のボーリング装置等を使用して容
易に行なうことができる。そしてこの実施例では、二重
管ロッド１２を構成する外管１３とこれの内部に挿入さ
れた内管１４とを、一体として汚染土層１０の直上まで
打ち込んだ後、内管１４のみを外管１３の下端部から突
出させてさらに下方に打ち込んで、汚染土層１０を貫通
させるようにする。After forming the cutoff wall 11, the double pipe rod 12 is driven into the contaminated soil layer 10 (see FIG. 1 (b)). This driving work is
For example, it can be easily carried out by using various known boring devices of rotary press-fitting type or striking type, which are used when a double-tube type injection rod is driven into the ground in the chemical liquid injection method or the like. In this embodiment, the outer pipe 13 constituting the double pipe rod 12 and the inner pipe 14 inserted therein are integrally driven up to just above the contaminated soil layer 10, and then only the inner pipe 14 is removed. The contaminated soil layer 10 is penetrated by projecting it from the lower end of the pipe 13 and driving it further downward.
【００１６】ここで、二重管ロッド１２は、例えば径３
０ｃｍ程度の大きさの下端が開口した中空円筒状の外管
１３と、この外管１３の内部に挿入される、例えば径１
０ｃｍ程度の大きさの下端が閉塞する中空円筒状の内管
１４とからなり、これらの外管１３及び内管１４には、
地中への挿入作業を容易に行なうことができるように、
その先端に切削ビットが各々取り付けられている。ま
た、内管１４の先端部分には、その周面に噴射ノズルが
取り付けられており、内管１４に給送される加圧水をこ
の噴射ノズルから略水平方向に高圧噴射することができ
るようになっている。そしてさらに、これらの外管１３
及び内管１４は、地上に設けた上記ボーリング装置ない
しは引抜き装置などにより、互いに独立回転しつつ引抜
き可能な構成となっているとともに、これらの打ち込み
作業が終了した後、これらの上端部分は、外管１３は排
出配管１６を経て浄化施設と、内管１４は高圧ホース１
７を経て加圧水圧送ポンプと各々接続されることになる
（図１（ｃ）参照）。Here, the double tube rod 12 has, for example, a diameter of 3
A hollow cylindrical outer tube 13 of which the lower end has a size of about 0 cm and an opening, and a diameter of 1 mm, for example, which is inserted into the outer tube 13.
It is composed of a hollow cylindrical inner tube 14 with a lower end having a size of about 0 cm closed, and these outer tube 13 and inner tube 14 are
In order to facilitate the insertion work into the ground,
A cutting bit is attached to each tip. An injection nozzle is attached to the peripheral surface of the tip end of the inner pipe 14, so that the pressurized water supplied to the inner pipe 14 can be injected at high pressure in a substantially horizontal direction from this injection nozzle. ing. And further, these outer tubes 13
The inner tube 14 and the inner tube 14 are configured to be able to be pulled out while rotating independently of each other by the boring device or the pulling device provided on the ground, and after the driving work thereof is completed, their upper end portions are The pipe 13 is a purification facility via a discharge pipe 16, and the inner pipe 14 is a high pressure hose 1.
7 and each of them is connected to the pressurized water pressure pump (see FIG. 1 (c)).
【００１７】二重管ロッド１２の外管１３及び内管１４
を上述の深度まで打ち込んだら、図１（ｃ）に示すよう
に、地中の汚染土をスラリー化してこれを除去する作業
を行なう。すなわち、加圧水圧送ポンプから内管１４に
加圧水を給送して、これを内管１４の先端部外周の噴射
ノズルから汚染土層１０内に高圧噴射するとともに、汚
染土層１０を横断して設置した内管１４を回転させなが
ら徐々に引き抜けば、汚染土層１０を構成する汚染土
は、高圧噴射された加圧水により切削撹拌されてスラリ
ー化するとともに、このスラリー化して流動状態となっ
た汚染土は、継続して噴射される加圧水の供給圧力によ
って、外管１３と内管１４との間の隙間を介して上方に
押し上げられ、地上に排出されて排出配管を経て浄化施
設に送られることになる。そして、この１サイクルの汚
染土の排出除去作業が終了したら、二重管ロッド１２等
を引抜き撤去する。The outer tube 13 and the inner tube 14 of the double tube rod 12
After being driven to the above-mentioned depth, as shown in FIG. 1 (c), an operation of making contaminated soil in the ground into slurry and removing it is performed. That is, pressurized water is fed from the pressurized water pump to the inner pipe 14, and the water is injected into the contaminated soil layer 10 at high pressure from the injection nozzle on the outer periphery of the tip of the inner pipe 14 and installed across the contaminated soil layer 10. When the inner pipe 14 is gradually pulled out while rotating, the contaminated soil forming the contaminated soil layer 10 is cut and agitated by the high-pressure jetted pressurized water to be slurried, and the slurried and contaminated contamination is obtained. Due to the supply pressure of the pressurized water that is continuously jetted, the soil is pushed upward through the gap between the outer pipe 13 and the inner pipe 14, discharged to the ground, and sent to the purification facility via the discharge pipe. become. Then, when the discharge and removal work of the contaminated soil in one cycle is completed, the double pipe rod 12 and the like are pulled out and removed.
【００１８】なお、上記二重管ロッド１２を地中に打設
挿入して行われる１サイクルの汚染土の除去作業では、
例えば４ｍ2 程度の限られた範囲の汚染土しか除去する
ことが出来ないため、汚染土層１０の全体にわたって汚
染土を除去するためには、例えば４ｍ2 毎に一個所の割
合で、上記１サイクルの除去作業を複数回繰り返して行
なうことになる（図１（ｄ）参照）。In addition, in one cycle of the contaminated soil removing work which is carried out by inserting the double pipe rod 12 into the ground,
For example, since it is possible to remove contaminated soil in a limited range of about 4 m 2, in order to remove contaminated soil over the entire contaminated soil layer 10, for example, at a rate of 1 part per 4 m 2 , The cycle removing work is repeated a plurality of times (see FIG. 1 (d)).
【００１９】ここで、加圧水に加えて加圧空気を内管１
４に給送し、加圧水に加圧空気を混入した状態で噴射ノ
ズルから汚染土層１０内に高圧噴射するようにすれば、
加圧水の汚染土層１０内における到達距離を増大させる
ことができ、これによって１サイクルの施工による汚染
土のスラリー化及び除去範囲を増大し、施工サイクル数
を低減して効率の良い除去作業を行なうことができる。
なお、ここで加圧空気を内管１４に給送してこれを加圧
水とともに噴射するには、例えば、内管１４の構造をさ
らに二重管構造とし、内管の先端部まで加圧水と加圧空
気を別々に給送した後、当該先端部に互いに近接して設
けた各々の噴射ノズルからこれらを噴射すれば、これら
を混合した状態で容易に汚染土壌中に高圧噴射すること
ができる。Here, in addition to the pressurized water, pressurized air is supplied to the inner pipe 1.
4 and when high-pressure injection is performed from the injection nozzle into the contaminated soil layer 10 in a state where pressurized air is mixed with pressurized water,
It is possible to increase the reach distance of the pressurized water in the contaminated soil layer 10, thereby increasing the slurrying and removal range of the contaminated soil by one-cycle construction, reducing the number of construction cycles, and performing efficient removal work. be able to.
Here, in order to feed the pressurized air to the inner pipe 14 and inject it together with the pressurized water, for example, the structure of the inner pipe 14 is further made into a double pipe structure, and the pressurized water and the pressure are applied to the tip of the inner pipe. after feeding the air separately, if injecting them from the injection nozzle of each provided close to each other in the distal portion, it can be high-pressure injection into easily contaminated soil while mixing this is found .
【００２０】また、この実施例では、締切り壁１１によ
って、汚染土を除去する範囲が予め画定されているの
で、加圧水によりスラリー化する範囲を不必要に拡大し
て周囲の地盤に影響を与えることなく、さらに効率良く
除去作業を行なうことができる。Further, in this embodiment, since the range in which the contaminated soil is removed is defined in advance by the shutoff wall 11, the range in which the slurry is slurried by the pressurized water is unnecessarily enlarged to affect the surrounding ground. Therefore, the removal work can be performed more efficiently.
【００２１】なお、上記除去作業によれば、汚染土が除
去された後は、地中には、例えば汚染土除去後の残留砂
礫分を残して空洞部分１５を生じることになる場合があ
るが（図１（ｄ）参照）、かかる空洞部分１５は、薬液
の注入作業等によって充填復旧しても良く、また自然に
あるいは機械的に荷重を加えて上方の地盤を沈下させる
ことにより、埋戻して復旧することもできる。According to the above-mentioned removal work, after the contaminated soil is removed, there may be a case where a hollow portion 15 is formed in the ground, for example, leaving residual gravel after removal of the contaminated soil. (See FIG. 1D.) The cavity portion 15 may be refilled by a chemical injection work or the like, or may be backfilled by applying a load naturally or mechanically to sink the upper ground. It can also be recovered.
【００２２】＜実験例＞次に、この発明の汚染土の除去
方法による除去効果を確認すべく行った実験例について
記載する。すなわち、この実験例は、一例として、地中
に残置された汚染土として有機物による汚染土を対象と
したもので、二重管ロッドを地中に打ち込み、表１に示
す回転速度及び引上げ速度で、加圧水を汚染土に向けて
高圧噴射しつつ内管を引き上げることにより、各々２回
の除去作業を行ない、汚染土の除去状況を、対象地盤を
構成する土砂の強熱減量を求めることによって確認し
た。<Experimental Example> Next, an experimental example conducted to confirm the removal effect of the method for removing contaminated soil according to the present invention will be described. That is, as an example, this experimental example is directed to soil contaminated with organic matter as contaminated soil left in the ground, and the double pipe rod is driven into the ground, and the rotation speed and pulling speed shown in Table 1 are used. By performing high-pressure injection of pressurized water toward the contaminated soil and pulling up the inner pipe, the removal work is performed twice, and the removal status of the contaminated soil is confirmed by determining the ignition loss of the soil that composes the target ground. did.
【００２３】ここで、強熱減量とは、土質工学会基準
「土の強熱減量試験方法」（ＪＳＦＴ ２２１−１９９
０）によってよって求められた、「１１０℃で一定質量
になるまで炉乾燥した土を７００〜８００℃に強熱した
ときの減少質量を炉乾燥土の質量に対する百分率で表し
た値」で、有機物を酸化燃焼させて試料土に含まれる有
機物の量を求めるものである。[0023] Here, the loss on ignition is based on the Society of Geotechnical Engineering "Test method for loss on ignition of soil" (JSFT 221-199).
0), "the value obtained by expressing the reduced mass when the oven-dried soil is ignited to 700 to 800 ° C. until it reaches a constant mass at 110 ° C. as a percentage of the mass of the oven-dried soil". The amount of organic matter contained in the sample soil is determined by oxidative combustion.
【００２４】すなわち、汚染土の除去前の対象土と、除
去作業後の対象土とから採取した試料土の強熱減量を比
較することにより、有機物すなわち汚染土の除去状況を
把握することができる。That is, by comparing the ignition loss of the sample soil collected from the target soil before the removal of the contaminated soil and the target soil after the removal work, the removal status of the organic matter, that is, the contaminated soil can be grasped. .
【００２５】試験結果を同表に示す。なお、汚染土の除
去前の対象土の強熱減量（有機物量）は、１９％であっ
た。The test results are shown in the same table. The ignition loss (organic matter amount) of the target soil before the removal of the contaminated soil was 19%.
【００２６】[0026]
【表１】
表１に示す試験結果から、この発明の汚染土の除去方法
によって、汚染土を、８０〜９４％、平均で８８％除去
することができる点が判明した。[Table 1] From the test results shown in Table 1, it was found that the method for removing contaminated soil of the present invention can remove contaminated soil by 80 to 94%, and 88% on average.
【００２７】[0027]
【発明の効果】以上詳細に説明したように、この発明の
汚染土の除去方法によれば、汚染土層の周囲を囲む締切
り壁を鋼矢板等によって地中に形成した後、二重管ロッ
ドを汚染土層に向かって地中に打設挿入し、一体として
前記汚染土層の直上まで打ち込んだ後、内管のみを外管
の下端部から突出させてさらに下方に打ち込んで前記汚
染土層を貫通させ、内管から加圧水を汚染土層に噴射す
ることにより汚染土をスラリー化するとともに、前記内
管を徐々に引き抜き、このスラリー化した汚染土を、外
管と内管との間の隙間を経て上方に押し上げて地上に排
出するだけの簡易な方法により、迅速かつ経済的に地中
に残置された汚染土を除去することができる。内管から
加圧水を噴射することによる汚染土のスラリー化は、汚
染土層の周囲を囲む締切り壁を鋼矢板等によって地中に
形成した後におこなわれるので、汚染土の除去範囲を予
め画定して、さらに効率の良い除去作業を可能にするこ
とができる。As described in detail above, according to the method for removing contaminated soil of the present invention, a double wall rod is formed after a shutoff wall surrounding the contaminated soil layer is formed in the ground by a steel sheet pile or the like. Inserted into the ground toward the contaminated soil layer, and integrated
After driving to just above the contaminated soil layer, only the inner pipe is
Of the dirt by projecting it from the lower end of the
The contaminated soil is slurried by penetrating the soil layer and spraying pressurized water from the inner pipe to the contaminated soil layer .
The pipe is gradually pulled out , and the contaminated soil that has been slurried is left in the ground quickly and economically by a simple method that pushes it upward through the gap between the outer pipe and the inner pipe and discharges it to the ground. It is possible to remove the contaminated soil. Slurry of contaminated soil by injecting pressurized water from the inner pipe is performed after forming a cutoff wall surrounding the contaminated soil layer in the ground with steel sheet piles, etc. Further, it is possible to enable more efficient removal work.
【００２８】また、加圧水を加圧空気とともに内管に給
送して、この加圧空気とともに加圧水を汚染土層に向か
って噴射するようにすれば、内管から噴射される加圧水
の汚染土層内における到達距離を増大させることがで
き、これによって一個所の二重管ロッドによる汚染土の
除去範囲を増大して、効率の良い除去作業を可能にする
ことができる。Further, by feeding the inner tube pressurized water with pressurized air, pressurized water polluted soil to be lever, is injected from the inner tube to inject toward the pressurized water to the polluted soil layer with the compressed air It is possible to increase the reaching distance in the layer, thereby increasing the removal range of the contaminated soil by the single double tube rod, and enabling efficient removal work.
【００２９】[0029]
【図１】（ａ）〜（ｄ）は、この発明の一実施例に係る
汚染土の除去方法の作業工程を示す説明図である。1A to 1D are explanatory views showing working steps of a method for removing contaminated soil according to an embodiment of the present invention.
【図２】従来の汚染土の除去方法の一例を示す説明図で
ある。FIG. 2 is an explanatory diagram showing an example of a conventional method for removing contaminated soil.
１０ 汚染土層 １１ 締切り壁 １２ 二重管ロッド １３ 外管 １４ 内管 １６ 排出配管 １７ 高圧ホース 10 contaminated soil layers 11 dead wall 12 Double tube rod 13 outer tube 14 Inner tube 16 Discharge pipe 17 High pressure hose
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北島 哲一 兵庫県神戸市中央区西町35 株式会社大 林組神戸支店内 (72)発明者 山本 幸平 兵庫県神戸市中央区西町35 株式会社大 林組神戸支店内 (72)発明者 峠 和男 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (72)発明者 漆原 知則 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (72)発明者 前田 章 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (72)発明者 石田 道彦 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (56)参考文献 特開 平５−192648（ＪＰ，Ａ) 特開 平３−119288（ＪＰ，Ａ) 特開 昭61−249587（ＪＰ，Ａ) 特開 昭53−21002（ＪＰ，Ａ) 実開 平３−12926（ＪＰ，Ｕ) 実開 平３−125832（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Tetsuichi Kitajima 35 Nishimachi, Chuo-ku, Kobe-shi, Hyogo Dai Co., Ltd. Hayashigumi Kobe Branch (72) Inventor Kohei Yamamoto 35 Nishimachi, Chuo-ku, Kobe-shi, Hyogo Dai Co., Ltd. Hayashigumi Kobe Branch (72) Inventor Kazuo Toge 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Tomonori Urushihara 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Akira Maeda 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Michihiko Ishida 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) Reference JP-A-5-192648 (JP, A) JP-A-3-119288 (JP, A) JP 61-249587 (JP, A) JP-A-53-21002 (JP, A) Actual Kaihei 3-12926 (JP, U) Actual Kaihei 3-125832 (JP, U)
Claims (2)
ための方法であって、前記汚染土層の周囲を囲む締切り
壁を鋼矢板等によって地中に形成した後、外管とこれの
内部に挿入された内管とからなる二重管ロッドを汚染土
層に向かって地中に打設挿入し、一体として前記汚染土
層の直上まで打ち込んだ後、内管のみを外管の下端部か
ら突出させてさらに下方に打ち込んで前記汚染土層を貫
通させ、前記内管に加圧水を給送して、前記外管の先端
より突出配置した前記内管の先端部から周囲の汚染土層
に加圧水を噴射することによって汚染土をスラリー化す
るとともに、前記内管を徐々に引き抜き、該スラリー化
した汚染土を、前記外管と内管との間の隙間を経て上方
に押し上げることにより、地上に排出することを特徴と
する汚染土の除去方法。1. A method for removing contaminated soil left in the ground, comprising forming a shut wall surrounding the contaminated soil layer in the ground with a steel sheet pile or the like, and then forming an outer pipe and the outer pipe. insert Da設into the ground to the double tube rod consisting of an inner tube inserted into the inside toward the polluted soil layer, the contaminated soil as an integral
After driving to just above the layer, insert only the inner pipe into the lower end of the outer pipe.
From above and drive further downward to penetrate the contaminated soil layer.
And feed pressurized water to the inner pipe to spray the pressurized water from the tip of the inner pipe projecting from the tip of the outer pipe to the surrounding contaminated soil layer to make the contaminated soil into a slurry .
At the same time, the inner pipe is gradually pulled out , and the contaminated soil that has been slurried is discharged to the ground by pushing it up through the gap between the outer pipe and the inner pipe. Removal method.
給送し、前記加圧水を加圧空気とともに汚染土層に噴射
することを特徴とする請求項１に記載の汚染土の除去方
法。2. The removal of polluted soil according to claim 1, wherein pressurized air is supplied to the inner pipe in addition to pressurized water, and the pressurized water is jetted together with the pressurized air into a contaminated soil layer. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10883495A JP3450092B2 (en) | 1995-05-02 | 1995-05-02 | How to remove contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10883495A JP3450092B2 (en) | 1995-05-02 | 1995-05-02 | How to remove contaminated soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08299944A JPH08299944A (en) | 1996-11-19 |
| JP3450092B2 true JP3450092B2 (en) | 2003-09-22 |
Family
ID=14494742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10883495A Expired - Fee Related JP3450092B2 (en) | 1995-05-02 | 1995-05-02 | How to remove contaminated soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3450092B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3658319B2 (en) * | 2000-12-27 | 2005-06-08 | 不動建設株式会社 | Purification method for contaminated ground |
| JP6171420B2 (en) * | 2013-03-08 | 2017-08-02 | 株式会社大林組 | Method of construction of retaining wall |
-
1995
- 1995-05-02 JP JP10883495A patent/JP3450092B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08299944A (en) | 1996-11-19 |
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