JP2005248632A - Liquid injection method, recharge method and chemical grouting method - Google Patents

Liquid injection method, recharge method and chemical grouting method Download PDF

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JP2005248632A
JP2005248632A JP2004063085A JP2004063085A JP2005248632A JP 2005248632 A JP2005248632 A JP 2005248632A JP 2004063085 A JP2004063085 A JP 2004063085A JP 2004063085 A JP2004063085 A JP 2004063085A JP 2005248632 A JP2005248632 A JP 2005248632A
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ground
injection
laying
laying hole
pipes
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Takehiko Suzuki
毅彦 鈴木
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Kanpai Co Ltd
株式会社関配
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<P>PROBLEM TO BE SOLVED: To provide a liquid injection method, a recharge method and a chemical grouting method by which the liquid like the ground water or the chemical is properly injected along a longitudinal direction of a pipe laid in the ground. <P>SOLUTION: Multi-layered well pipes 9a, 9b, 9c, 9d having gaps between the inner parts and the outer parts are laid in a laying hole 8 in the ground in the ascending order of the pipe diameter from the deepest side of the laying hole 8 in a state that the inlets of the well pipes are out of alignment. Thus, the inlets of the well pipes are located at different places in a longitudinal direction of the laying hole, and the liquids fed into the pipes, respectively, are discharged from the inlets of the pipes, respectively, at different places in the longitudinal direction of the laying hole. Packers 10a, 10b, 10c, 10d attached to the well pipes, respectively, are expanded to form a plurality of separate injection areas 11a, 11b, 11c, 11d. Consequently, injection into each injection area is enabled, and the liquid like the ground water or the chemical is properly injected into the ground along the longitudinal direction of the multi-layered well pipes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、地盤から揚水した地下水を復水したり地盤に土壌汚染回復用の薬液を注入する工法に関する。   The present invention relates to a method for condensing groundwater pumped from the ground and injecting a chemical solution for soil contamination recovery into the ground.
建設工事や地下工事等では、地盤の掘削時に湧き出す地下水が作業障害になる。このため現場では、これを一旦揚水し、例えば下水道に排水することもあるが、下水道の利用コストの削減や、地下水環境の保全のため、揚水した地下水を地盤に返送することが行われている(特許文献1)。その具体的方法の一例は、例えば図2で示すように、地盤に揚水領域と返送領域とを仕切るパイルなどの隔壁1を地盤に打込み、揚水領域に建て込んだ揚水管2と図外のポンプを使って、地下水Wを揚水する。汲み上げられた地下水Wは、地上の貯水タンク3に一旦溜め込まれ、そこから圧送ポンプ4を使って、地盤に敷設した単管構成の井戸管5から地盤の透水層にリチャージされる。なお、一般的には、井戸管5の地上側における地盤の不透水層に対応する部分には、薬液注入によって、その敷設孔と井戸管5との隙間から地下水が逆流するのを阻止するパッカー部6が形成される。
特開2000−256539号公報
In construction work, underground work, etc., groundwater that springs up during excavation of the ground becomes a work obstacle. For this reason, at the site, the water is once pumped and drained into the sewer, for example, but the groundwater that has been pumped is returned to the ground to reduce the cost of using the sewer and to preserve the groundwater environment. (Patent Document 1). As an example of the specific method, for example, as shown in FIG. 2, a partition wall 1 such as a pile for partitioning a pumping area and a return area is driven into the ground, and a pumping pipe 2 built in the pumping area and a pump outside the figure. To pump up the groundwater W. The pumped-up groundwater W is once stored in the above-ground water storage tank 3 and then recharged from the well pipe 5 having a single pipe structure laid on the ground to the permeable layer of the ground by using a pressure pump 4. In general, the portion corresponding to the ground impermeable layer on the ground side of the well pipe 5 is a packer that prevents backflow of ground water from the gap between the laying hole and the well pipe 5 by chemical injection. Part 6 is formed.
JP 2000-256539 A
ところで、この図2で示す従来工法では、地下水Wの流量制御が難しいという問題ある。つまり、揚水した地下水Wは圧送ポンプ4により井戸管5に送られるが、地下水位6の上下における圧力の大小関係で、送量によっては、地下水位6に近い位置で大量に噴き出し、そこから先端側にかけては徐々に水量が少なくなってしまい、本来返送を意図する井戸管5の水平部分では復水効果が十分に得られないことがある。こうした問題は、以上のような復水工法に固有の問題ではなく、前記のような井戸管5を用いて地盤の土壌汚染領域に汚染改良用の薬液を注入するような場合であっても同様の現象が発生し、復水工法と共通の課題とされている。   Incidentally, the conventional method shown in FIG. 2 has a problem that it is difficult to control the flow rate of the groundwater W. In other words, the pumped-up groundwater W is sent to the well pipe 5 by the pumping pump 4, but depending on the amount of pressure at the top and bottom of the groundwater level 6, a large amount is ejected at a position close to the groundwater level 6, and the tip from there The amount of water gradually decreases toward the side, and the condensing effect may not be sufficiently obtained in the horizontal portion of the well pipe 5 that is originally intended to be returned. Such a problem is not a problem peculiar to the condensate method as described above, and is similar even when the chemical solution for improving the contamination is injected into the soil contaminated area of the ground using the well pipe 5 as described above. This phenomenon is common to the condensate method.
以上のような従来技術を背景になされたのが本発明である。その目的は、地盤に敷設した管の長手方向に沿って地下水や薬液等の液体を適切に注入できる技術、つまり液体注入工法、復水工法及び薬液注入工法の提供にある。   The present invention has been made against the background of the prior art as described above. The purpose is to provide a technique capable of appropriately injecting a liquid such as groundwater or a chemical solution along the longitudinal direction of the pipe laid on the ground, that is, a liquid injection method, a condensate method and a chemical solution injection method.
この目的を達成すべく、本発明は、地盤に敷設した管を通じて、地盤に液体を注入する液体注入工法について、内外で隙間が形成される少なくとも2本以上の多重管を、地盤に形成した敷設孔に、奥側から管径の小さい順で各管の液体注入口をずらした状態で敷設するとともに、各管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の管の注入口が開口する複数の注入領域を、敷設孔の長手方向に沿って区画形成し、該注入領域で地盤に液体を注入することを特徴とした。   In order to achieve this object, the present invention relates to a liquid injection method for injecting liquid into the ground through a pipe laid on the ground, and laying at least two or more multiple pipes on the ground where gaps are formed inside and outside. In the hole, the liquid inlets of each pipe are laid out in order of decreasing tube diameter from the back side, and the packer attached to each pipe is pressed against the inner wall of the laying hole so that at least one between adjacent packers. A plurality of injection regions where the inlets of the pipes are opened are partitioned along the longitudinal direction of the laying holes, and liquid is injected into the ground in the injection regions.
また、本発明は、地盤に敷設した井戸管を通じて、揚水した地下水を地盤に返送する復水工法について、内外で隙間が形成される少なくとも2本以上の多重の井戸管を、地盤に形成した敷設孔に、奥側から管径の小さい順で各井戸管の注入口をずらした状態で敷設するとともに、各井戸管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の井戸管の注入口が開口する複数の注入領域を、敷設孔の長手方向に沿って区画形成し、該注入領域で地盤に地下水を注入することを特徴とした。   The present invention also relates to a condensate method for returning pumped groundwater to the ground through a well pipe laid on the ground, and laying on the ground with at least two or more multiple well pipes in which gaps are formed inside and outside. In the hole, the inlet of each well pipe is laid out in order of decreasing tube diameter from the back side, and the packer attached to each well pipe is pressed against the inner wall of the laying hole so that at least between adjacent packers A plurality of injection regions where the injection port of one well pipe is opened are sectioned along the longitudinal direction of the laying hole, and ground water is injected into the ground in the injection region.
さらに、本発明は、地盤に敷設した薬液注入管を通じて、地盤改良域に薬液を注入する薬液注入工法について、内外で隙間が形成される少なくとも2本以上の多重の薬液注入管を、地盤に形成した敷設孔に、奥側から管径の小さい順で各薬液注入管の注入口をずらした状態で敷設するとともに、各薬液注入管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の薬液注入管の注入口が開口する複数の薬液注入領域を、敷設孔の長手方向に沿って区画形成し、該注入領域で地盤に薬液を注入することを特徴とした。   Furthermore, the present invention relates to a chemical injection method for injecting a chemical into a ground improvement area through a chemical injection pipe laid on the ground, and forming at least two or more multiple chemical injection pipes on the ground with gaps formed inside and outside. In addition to laying in the laying hole with the injection port of each chemical solution injection pipe shifted from the back in order of decreasing tube diameter, press the packer attached to each chemical solution injection tube to the inner wall of the laying hole and adjoin A plurality of chemical solution injection regions in which an injection port of at least one chemical solution injection tube is opened between the packers are formed along the longitudinal direction of the laying hole, and the chemical solution is injected into the ground in the injection region. .
前記液体注入工法、復水工法、薬液注入工法では、地盤の敷設孔に、内外で隙間が形成される少なくとも2本以上の多重管を、敷設孔の奥側から管径の小さい順で注入口をずらした状態で敷設する。これによって、各管の注入口は、敷設孔の長手方向で異なる場所に位置することになる。つまり、各管ごとに送られる各液体は、敷設孔の長手方向で異なる場所で各管の注入口から排出される。そして、各管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の管の注入口が開口する複数の注入領域を、敷設孔の長手方向に沿って区画形成する。つまり、注入領域ごとに入側と出側を設けることで、各注入領域ごとの注入が可能であり、管の長手方向に沿って地下水や薬液等の液体を地盤に対して適切に注入することができる。   In the liquid injection method, the condensate method, and the chemical solution injection method, at least two or more multiple pipes in which a gap is formed inside and outside are formed in the ground laying hole in order of decreasing pipe diameter from the back side of the laying hole. Lay in a state of shifting. Thereby, the inlet of each pipe | tube will be located in a different place in the longitudinal direction of a laying hole. That is, each liquid sent to each tube is discharged from the inlet of each tube at a different location in the longitudinal direction of the laying hole. Then, a packer attached to each pipe is pressed against the inner wall of the laying hole, and a plurality of injection regions in which at least one pipe inlet is opened between adjacent packers are defined along the longitudinal direction of the laying hole. To do. In other words, by providing an entry side and an exit side for each injection region, injection for each injection region is possible, and liquids such as groundwater and chemicals are appropriately injected into the ground along the longitudinal direction of the tube. Can do.
このように、前記各本発明の工法では、注入領域ごとの注入が可能である。このため、複数の注入領域のそれぞれについて注入・非注入を選択的に実行するものとして構成することができる。よって、施工現場の地盤環境に応じた柔軟性のある多様な注入設計による実効性ある注入が可能である。そして、注入領域ごとの注入が可能であるから、所定の注入領域では揚水した地下水の復水を、他の注入領域では地盤改良の薬液注入を行うものとして構成できる。よって、異種工法の統合による重複労力の軽減、施工コストの削減など様々な統合効果が得られる。   Thus, in each of the construction methods of the present invention, the injection for each injection region is possible. For this reason, it can comprise as what selectively performs injection | pouring and non-injection about each of a some injection | pouring area | region. Therefore, effective injection is possible by various flexible injection designs according to the ground environment of the construction site. And since injection for every injection | pouring area | region is possible, it can comprise so that the condensate of the groundwater pumped up in a predetermined | prescribed injection | pouring area | region and chemical | medical solution injection | pouring of ground improvement may be performed in another injection | pouring area | region. Therefore, various integration effects such as reduction of duplication labor and reduction of construction cost by integration of different construction methods can be obtained.
以上の各工法については、パッカーが膨縮可能なものとして構成できる。これによれば、パッカーを縮小させることで、多重管の敷設や回収を容易に行うことができ、パッカーを膨張させることで、敷設孔の内壁に対して追従変形により密着し、高いパッカー効果が得られる。   About each above-mentioned construction method, it can constitute so that a packer can expand and contract. According to this, it is possible to easily lay and collect multiple tubes by reducing the packer, and by inflating the packer, it closely adheres to the inner wall of the laying hole by follow-up deformation and has a high packer effect. can get.
また、本発明は、前記液体注入工法と薬液注入工法について、地盤を直線状又は曲線状に掘削する自在掘削工法にて敷設孔を形成するものと構成される。   Moreover, this invention is comprised as what forms a laying hole by the flexible excavation method which excavates the ground in the shape of a straight line or a curve about the said liquid injection method and a chemical | medical solution injection method.
したがって、地盤内の特定箇所への液体注入と薬液注入が行えるため、注入精度を高めることができ、作業効率を向上できる。   Therefore, since the liquid injection and the chemical liquid injection to a specific place in the ground can be performed, the injection accuracy can be increased and the working efficiency can be improved.
さらに、本発明は、前記復水工法について、地盤を直線状又は曲線状に掘削する自在掘削工法にて、地面側から順に、斜め曲線状部分と横向き直線状部分とを有する水平井戸用の敷設孔を形成するものと構成される。   Further, the present invention relates to the condensate method, in a free excavation method for excavating the ground in a straight line or a curved line, in order from the ground side, laying for a horizontal well having a diagonally curved part and a horizontal straight part It is configured to form a hole.
したがって、異方性を有する地盤の帯水層(透水層)における所定箇所に水平井戸を確実に敷設することができる。   Therefore, a horizontal well can be reliably laid at a predetermined position in the aquifer (permeable layer) of the ground having anisotropy.
本発明の液体注入工法、復水工法、薬液注入工法は、各注入領域ごとに独立した流量制御が可能である。このため、管の長手方向に沿って地下水や薬液等の液体を地盤に対して適切に注入することができる。また、各管ごとの注入により、各注入領域ごとに注入・非注入を選択して、施工現場の地盤環境に応じた柔軟性のある多様な注入設計による、実効性ある注入が可能である。さらに、各管ごとの注入により、所定の注入領域では揚水した地下水の復水を、他の注入領域では地盤改良の薬液注入を行うものとして、異種工法の統合による重複労力の軽減、施工コストの削減など様々な統合効果が得られる。   In the liquid injection method, the condensate method, and the chemical solution injection method of the present invention, independent flow rate control is possible for each injection region. For this reason, liquids, such as groundwater and a chemical | medical solution, can be suitably inject | poured with respect to the ground along the longitudinal direction of a pipe | tube. In addition, by injection for each tube, it is possible to select injection / non-injection for each injection region, and effective injection can be performed by various flexible injection designs according to the ground environment of the construction site. Furthermore, by injecting each pipe, it is assumed that condensate of the groundwater pumped up in the predetermined injection area, and chemical improvement injection for ground improvement in the other injection areas. Various integration effects such as reduction can be obtained.
以下、本発明の一実施形態について図面を参照しつつ説明する。なお、本実施形態では、図2の従来例と同様に地盤に地下水を返送する復水工法について説明し、従来例と同じ重複説明は省略する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a condensate method for returning groundwater to the ground is described in the same manner as in the conventional example of FIG. 2, and the same overlapping description as in the conventional example is omitted.
図1で示すように、地盤の敷設孔8には、内外で隙間を形成する多重の井戸管9a,9b,9c,9dが敷設される。本形態の敷設孔8は、地盤を直線状及び曲線状に自在掘削する自在掘削工法により形成される。各井戸管9a〜9dは、地盤への地下水Wの注入口となる先端が、敷設孔8の長手方向で、それぞれ異なる場所に位置するように敷設される。各井戸管9a〜9dの後端(地上に到達する管端)は、それぞれが個別に圧送ポンプ4に接続されており、各々独立した流量制御によって地下水Wが注入される。したがって、井戸管9a〜9dごとに送られる各地下水Wは、敷設孔8の長手方向の異なる場所で、先端の注入口からそれぞれ独立した流量制御の下に排出される。   As shown in FIG. 1, multiple well pipes 9a, 9b, 9c and 9d are formed in the ground laying holes 8 to form gaps inside and outside. The laying hole 8 of this embodiment is formed by a free excavation method for freely excavating the ground in a straight line and a curved line. Each of the well pipes 9a to 9d is laid so that the tip serving as an inlet for the groundwater W to the ground is located at a different location in the longitudinal direction of the laying hole 8. The rear ends of the well pipes 9a to 9d (the pipe ends reaching the ground) are individually connected to the pumping pump 4, and the ground water W is injected by independent flow control. Therefore, each groundwater W sent to each of the well pipes 9a to 9d is discharged under independent flow control from the inlet at the tip at different locations in the longitudinal direction of the laying holes 8.
各井戸管9a〜9dの先端手前には、パッカー10a,10b,10c,10dが取付けられている。これらは、図示しないエアー供給管を介して地上からの空気の供給により膨張して、敷設孔8に対してその壁面形状に沿って追従変形しつつ圧接する。一方、これを縮小させれば、邪魔にならずに各井戸管9a〜9dの敷設や回収を容易に行うことができる。   Packers 10a, 10b, 10c, and 10d are attached to the front side of the well tubes 9a to 9d. These expand by the supply of air from the ground via an air supply pipe (not shown), and press contact with the laying hole 8 while following and deforming along the wall surface shape. On the other hand, if this is reduced, the well pipes 9a to 9d can be easily laid and collected without being disturbed.
そして、パッカー10a〜10dが、前記のように膨張し敷設孔8に圧接すると、各井戸管9a〜9dが敷設孔8の略孔軸に沿って支持されるとともに、敷設孔8にはその長手方向に沿ってそれぞれ独立した注入領域11a〜11dが区画形成される。   When the packers 10a to 10d are expanded and pressed into the laying hole 8 as described above, the well pipes 9a to 9d are supported along the substantially hole axis of the laying hole 8, and the laying hole 8 has its longitudinal length. Independent injection regions 11a to 11d are defined along the direction.
具体的には、注入領域11aはパッカー10aによって区画形成され、そこからは井戸管9aの管内を圧送される地下水Wが注入される。注入領域11bはパッカー10a,10bによって区画形成され、そこからは井戸管9bの管内を圧送される地下水Wが注入される。注入領域11cはパッカー10b,10cによって区画形成され、そこからは井戸管9cの管内を圧送される地下水Wが注入される。注入領域11dはパッカー10c,10dによって区画形成され、そこからは井戸管9dの管内を圧送される地下水Wが注入される。   Specifically, the injection region 11a is partitioned by the packer 10a, from which the groundwater W that is pumped through the well 9a is injected. The injection region 11b is defined by the packers 10a and 10b, from which groundwater W that is pumped through the well 9b is injected. The injection region 11c is defined by packers 10b and 10c, from which groundwater W that is pumped through the well 9c is injected. The injection region 11d is partitioned by the packers 10c and 10d, and from there is injected the groundwater W pumped through the well 9d.
こうした、各注入領域11a〜11dごとの注入により、地下水Wを地盤に対して適切に注入することができる。また、本形態では、各井戸管9a〜9dがそれぞれ独立して圧送ポンプ4に接続されるため、各井戸管9a〜9dごとに厳密な流量制御が可能となる。したがって、それぞれの注入領域11a〜11d周辺の地盤環境に応じて、注入量を異ならせたり、あるいは注入・非注入を選択的に実行することも可能となる。さらに、本形態で注入領域11dを区画形成するパッカー10dは、従来例のように地盤の不透水層で固結して形成される、地下水Wの逆流阻止用のパッカーとしても機能する。したがって、井戸管9a〜9dを回収しても地盤には、固結した従来のパッカーのような異物が残らない。   By such injection for each of the injection regions 11a to 11d, the groundwater W can be appropriately injected into the ground. Further, in this embodiment, since each of the well pipes 9a to 9d is independently connected to the pumping pump 4, strict flow rate control is possible for each of the well pipes 9a to 9d. Therefore, it is possible to vary the injection amount or selectively execute injection / non-injection according to the ground environment around each of the injection regions 11a to 11d. Furthermore, the packer 10d that partitions and forms the injection region 11d in this embodiment also functions as a backpacker for preventing the backflow of the groundwater W, which is formed by consolidation with an impermeable layer of ground as in the conventional example. Therefore, even if the well pipes 9a to 9d are collected, no foreign matter such as a conventional packed packer remains on the ground.
また、以上のような各井戸管9a〜9dの敷設孔8への敷設は、どの井戸管9a〜9dから敷設してもよいが、例えば井戸管9aを最初に敷設してからパッカー10aを膨張させた状態とし、次にその外側の井戸管9bを敷設する、といった具合に内側から外側にかけて順次、管敷設、パッカー膨張、管敷設、パッカー膨張、・・・のように敷設すれば、パッカー10aが膨張することで井戸管9aが敷設孔8の略孔軸上に支持されるので、井戸管9bの先端を敷設孔8の孔壁と擦らせずに推進させることができ、推進効率や井戸管9bの摺動による破損・裂損等の発生を抑制できる。   Further, the well pipes 9a to 9d can be laid in the laying holes 8 from any well pipe 9a to 9d. For example, after the well pipe 9a is first laid, the packer 10a is expanded. If the pipes 10a are laid in the order of pipe laying, packer expansion, pipe laying, packer expansion,... In order from the inner side to the outer side, etc. As the well pipe 9a is supported on the substantially hole axis of the laying hole 8, the tip of the well pipe 9b can be propelled without rubbing against the hole wall of the laying hole 8. Generation | occurrence | production of the breakage, tearing, etc. by sliding of the pipe | tube 9b can be suppressed.
前記実施形態については、様々な変形実施が可能である。すなわち、前記形態では、復水工法を例示したが、地盤の土壌汚染回復用の薬液を注入する薬液注入工法にも適用することができる。また、例えば注入領域11dについては、地盤改良用の薬液を注入する薬液注入工法を行い、その他の注入領域11a〜11cについては、地下水Wを注入する復水工法を行うといった具合に、異種工法を統合した液体注入工法として実施することも可能である。   Various modifications can be made to the embodiment. That is, in the said form, although the condensate construction method was illustrated, it can apply also to the chemical | medical solution injection | pouring method which inject | pours the chemical | medical solution for soil contamination recovery of the ground. In addition, for example, a chemical solution injection method for injecting a chemical solution for ground improvement is performed for the injection region 11d, and a condensate method for injecting groundwater W is performed for the other injection regions 11a to 11c. It can also be implemented as an integrated liquid injection method.
前記形態では、4本の井戸管9a〜9dを例示したが、前述のような複数の注入領域を形成する技術思想は、少なくとも2本の井戸管を使用すれば実現される。したがって、2本以上であれば、4本でなくても良い。   In the above embodiment, four well tubes 9a to 9d are exemplified. However, the technical idea of forming a plurality of injection regions as described above can be realized by using at least two well tubes. Therefore, if it is two or more, it may not be four.
前記形態で示した井戸管を含め、地盤に敷設する多重管(注入管)は、施工条件や液体の注入条件に応じて、材質や長さ管径などを適宜選定することが可能である。   For the multiple pipes (injection pipes) to be laid on the ground including the well pipes shown in the above-described form, the material, length pipe diameter, etc. can be appropriately selected according to the construction conditions and the liquid injection conditions.
前記形態では、各井戸管9a〜9dの先端を注入口としたが、先端は蓋をして、外周面に注入口を形成してもよい。この場合には、前記実施形態の図1で示したよりも、先端から距離をおいた位置にパッカー10a〜10dを取付けることになる。   In the said form, although the front-end | tip of each well pipe 9a-9d was made into the injection port, a front-end | tip may be covered and an injection port may be formed in an outer peripheral surface. In this case, the packers 10a to 10d are attached at positions farther from the tip than those shown in FIG.
前記形態では、各井戸管9a〜9dごとに圧送ポンプ4に接続し、それぞれ独立して流量制御をする例を示したが、各井戸管9a〜9dごとに厳密な流量制御が必要とされない場合には、各井戸管9a〜9dを一括して、あるいは数本ごとに纏めて、圧送ポンプ4に接続するようにしてもよい。   In the above embodiment, an example is shown in which each well pipe 9a to 9d is connected to the pumping pump 4 and the flow control is performed independently. However, when strict flow control is not required for each well pipe 9a to 9d. Alternatively, the well pipes 9a to 9d may be connected to the pumping pump 4 in a lump or in groups of several.
前記形態では、パッカー10a〜10dとして空気で膨張するものを例示したが、例えば地下水Wのような液体で膨張するものであってもよい。また、前記形態では、パッカー10a〜10dを各井戸管9a〜9dに一つずつ取付ける例を示したが、それ以上であっても良い。   In the above embodiment, the packers 10a to 10d are exemplified by those that expand with air, but may be expanded with a liquid such as groundwater W, for example. Moreover, in the said form, although the example which attaches the packers 10a-10d to each well pipe 9a-9d was shown, the more than that may be sufficient.
前記形態では、自在掘削工法により削孔した敷設孔8を例示したが、発進坑としての縦坑を(場合によっては到達坑としての縦坑をも)掘削し、縦坑から水平に井戸管を敷設するようにしてもよい。   In the above embodiment, the laying hole 8 drilled by the universal excavation method is illustrated, but a vertical shaft as a starting shaft (in some cases also a vertical shaft as an arrival shaft) is excavated, and a well pipe is formed horizontally from the vertical shaft. You may make it lay.
一実施形態による復水工法を模式的に示す説明図。Explanatory drawing which shows typically the condensate construction method by one Embodiment. 一従来例による復水工法を模式的に示す説明図。Explanatory drawing which shows typically the condensing method by a prior art example.
符号の説明Explanation of symbols
1 隔壁
2 揚水管
3 貯水タンク
4 圧送ポンプ
5 井戸管
6 パッカー部
7 地下水位
8 敷設孔
9a,9b,9c,9d 井戸管(多重管)
10a,10b,10c,10d パッカー
11a,11b,11c,11d 注入領域
W 地下水
DESCRIPTION OF SYMBOLS 1 Bulkhead 2 Pumping pipe 3 Water storage tank 4 Pumping pump 5 Well pipe 6 Packer part 7 Ground water level 8 Laying hole 9a, 9b, 9c, 9d Well pipe (multiple pipe)
10a, 10b, 10c, 10d Packer 11a, 11b, 11c, 11d Injection region
W groundwater

Claims (6)

  1. 地盤に敷設した管を通じて、地盤に液体を注入する液体注入工法において、
    内外で隙間が形成される少なくとも2本以上の多重管を、地盤に形成した敷設孔に、奥側から管径の小さい順で各管の液体注入口をずらした状態で敷設するとともに、各管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の管の注入口が開口する複数の注入領域を、敷設孔の長手方向に沿って区画形成し、該注入領域で地盤に液体を注入することを特徴とする液体注入工法。
    In the liquid injection method of injecting liquid into the ground through the pipe laid on the ground,
    At least two or more multiplex pipes in which gaps are formed inside and outside are laid in the laying holes formed in the ground in a state where the liquid inlets of the respective pipes are shifted from the back side in order of decreasing pipe diameter. A packer attached to the inner wall of the laying hole is pressed against the inner wall of the laying hole, and a plurality of injection regions in which an injection port of at least one tube is opened between adjacent packers are formed along the longitudinal direction of the laying hole. A liquid injection method characterized by injecting liquid into the ground in the area.
  2. 地盤を直線状又は曲線状に掘削する自在掘削工法にて敷設孔を形成する請求項1記載の液体注入工法。   2. The liquid injection method according to claim 1, wherein the laying hole is formed by a free excavation method for excavating the ground in a straight line or a curved line.
  3. 地盤に敷設した井戸管を通じて、揚水した地下水を地盤に返送する復水工法において、
    内外で隙間が形成される少なくとも2本以上の多重の井戸管を、地盤に形成した敷設孔に、奥側から管径の小さい順で各井戸管の注入口をずらした状態で敷設するとともに、各井戸管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の井戸管の注入口が開口する複数の注入領域を、敷設孔の長手方向に沿って区画形成し、該注入領域で地盤に地下水を注入することを特徴とする復水工法。
    In the condensate method of returning pumped groundwater to the ground through a well pipe laid on the ground,
    While laying at least two or more multiple well pipes in which gaps are formed inside and outside, in the laying hole formed in the ground, with the inlet of each well pipe shifted from the back side in order of decreasing pipe diameter, A packer attached to each well pipe is pressed against the inner wall of the laying hole, and a plurality of injection regions in which at least one well pipe inlet is opened between adjacent packers are defined along the longitudinal direction of the laying hole. And a condensate method for injecting groundwater into the ground in the injection region.
  4. 地盤を直線状又は曲線状に掘削する自在掘削工法にて、地面側から順に、斜め曲線状部分と横向き直線状部分とを有する井戸用の敷設孔を形成する請求項3記載の復水工法。   The condensate method according to claim 3, wherein a well digging hole having an obliquely curved portion and a laterally straight portion is formed in order from the ground side by a free excavation method for excavating the ground in a straight line or a curved line.
  5. 地盤に敷設した薬液注入管を通じて、地盤改良域に薬液を注入する薬液注入工法において、
    内外で隙間が形成される少なくとも2本以上の多重の薬液注入管を、地盤に形成した敷設孔に、奥側から管径の小さい順で各薬液注入管の注入口をずらした状態で敷設するとともに、各薬液注入管に取付けたパッカーを敷設孔の内壁に圧接させて、隣接するパッカー間に少なくとも1本の薬液注入管の注入口が開口する複数の薬液注入領域を、敷設孔の長手方向に沿って区画形成し、該注入領域で地盤に薬液を注入することを特徴とする薬液注入工法。
    In the chemical injection method that injects the chemical into the ground improvement area through the chemical injection pipe laid on the ground,
    At least two or more multiple chemical solution injection pipes with gaps formed inside and outside are laid in the laying hole formed in the ground in a state where the injection ports of the chemical solution injection pipes are shifted from the back side in order of decreasing tube diameter. In addition, a packer attached to each chemical solution injection tube is pressed against the inner wall of the laying hole, and a plurality of chemical solution injection regions in which at least one injection port of the chemical solution injection tube is opened between adjacent packers are arranged in the longitudinal direction of the laying hole. A chemical solution injecting method characterized in that a chemical solution is formed along the line and injected into the ground in the injection region.
  6. 地盤を直線状又は曲線状に掘削する自在掘削工法にて敷設孔を形成する請求項5記載の薬液注入工法。   The chemical injection method according to claim 5, wherein the laying hole is formed by a free excavation method for excavating the ground in a straight line or a curved line.
JP2004063085A 2004-03-05 2004-03-05 Liquid injection method, recharge method and chemical grouting method Pending JP2005248632A (en)

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