JP2000273859A - Chemical grouting method - Google Patents
Chemical grouting methodInfo
- Publication number
- JP2000273859A JP2000273859A JP2000072674A JP2000072674A JP2000273859A JP 2000273859 A JP2000273859 A JP 2000273859A JP 2000072674 A JP2000072674 A JP 2000072674A JP 2000072674 A JP2000072674 A JP 2000072674A JP 2000273859 A JP2000273859 A JP 2000273859A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- packer
- tube
- hole
- insertion hole
- 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
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、地盤改良のための
薬液注入工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical liquid injection method for improving a ground.
【0002】[0002]
【従来の技術】この種の工法および装置は、主に昭和4
0年代の後半から昭和50年代において多くの改良が加
えられてきた。現在も使用されている代表例はロッド注
入工法、ストレーナ注入工法、および二重管ダブルパッ
カー注入工法である。2. Description of the Related Art This type of construction method and apparatus are mainly used in Showa 4
Many improvements have been made in the late 1950s and 1975. Typical examples still in use are the rod injection method, the strainer injection method, and the double pipe double packer injection method.
【0003】このうち二重管ダブルパッカー注入工法
は、確実な浸透注入を行うことができる点で優れてい
る。[0003] Among them, the double-pipe double-packer injection method is excellent in that reliable infiltration can be performed.
【0004】二重管ダブルパッカー注入においては、予
め対象地盤を所定深度まで掘削して挿入孔を形成し、そ
の挿入孔内に二重管ダブルパッカー注入用注入管(外管
と内管を備える)を挿入する。In the injection of a double pipe double packer, a target ground is excavated to a predetermined depth to form an insertion hole, and an injection pipe for double pipe double packer injection (including an outer pipe and an inner pipe) is formed in the insertion hole. ).
【0005】しかし、挿入孔と注入管との間には、クリ
アランスが生じ、薬液を注入したとき、その薬液が地上
に流出してしまうので、予め、そのクリアランスにセメ
ントベントナイト充填材を充填しておき、薬液の圧送圧
によりそのセメントベントナイト充填材を割裂させなが
ら、地盤内に薬液を注入する。However, a clearance is formed between the insertion hole and the injection pipe, and when the chemical is injected, the chemical flows out to the ground. Therefore, the clearance is previously filled with a cement bentonite filler. The chemical is injected into the ground while the cement bentonite filler is split by the pressure of the chemical.
【0006】[0006]
【発明が解決しようとする課題】したがって、セメント
ベントナイト充填材を割裂した薬液は、挿入孔壁面に対
応した地盤と接したきわめて狭い面積の部位のみを通し
て浸透注入する。Therefore, the chemical liquid obtained by splitting the cement bentonite filler is permeated and injected only through a very small area in contact with the ground corresponding to the wall surface of the insertion hole.
【0007】このために注入速度を増大させると、地盤
が薬液も受け入れる浸透許容速度を上回り、地盤内にお
いて割裂が生じ、挿入孔の軸心を中心とした同心円筒状
の改良体を造成できず、地盤の緩み部分に多く注入され
る。その結果、改良体は一般的に楕円状となる。ちなみ
に、浸透許容速度は砂質地盤では一般的に約10リット
ル/分である。[0007] For this reason, when the injection speed is increased, the ground exceeds the permeation permissible speed at which the chemical solution is also received, and splitting occurs in the ground, so that a concentric cylindrical improved body centering on the axis of the insertion hole cannot be formed. , Is often injected into loose parts of the ground. As a result, the improvement is generally elliptical. Incidentally, the permeation permissible speed is generally about 10 l / min in sandy ground.
【0008】本発明の主たる課題は、浸透注入による横
断面同心円状の改良体を造成すること、注入の各ステー
ジにおいて、直径で約5m程度の球状の大形の改良体を
造成することにある。この改良体を軸方向に連結または
連続させるようにすると、直径約5m程度の円筒状の改
良体を造成できる。A main object of the present invention is to form a concentrically improved cross-section by permeation injection, and to form a large-sized improved spherical member having a diameter of about 5 m at each stage of injection. . When the improved body is connected or connected in the axial direction, a cylindrical improved body having a diameter of about 5 m can be formed.
【0009】[0009]
【課題を解決するための手段】上記課題を解決した本発
明は以下のとおりである。 <請求項1記載の発明>対象地盤を所定深度まで掘削し
て挿入孔を形成するとともに、軸方向に間隔を置いて複
数のパッカーを外面部に有し、かつ隣接するパッカー間
に注入口を有する注入外管を前記挿入孔内に相対的に挿
入し、前記隣接する両パッカーを膨出させて前記挿入孔
壁面に密着させ、このとき前記隣接パッカーと挿入孔壁
面と注入外管外面とで囲まれる領域を空間とした状態
で、前記注入口から薬液を前記空間に満たしつつ、10
リットル/分を超え40リットル/分以下の注入速度を
もって砂質または砂礫地盤に注入することを特徴とする
薬液注入工法。The present invention which has solved the above-mentioned problems is as follows. <Invention according to claim 1> The target ground is excavated to a predetermined depth to form an insertion hole, and a plurality of packers are provided on an outer surface at intervals in an axial direction, and an injection port is provided between adjacent packers. The outer tube having an injection is relatively inserted into the insertion hole, and the two adjacent packers are swelled and brought into close contact with the wall surface of the insertion hole. With the enclosed area being a space, while filling the space with the drug solution from the inlet, 10
A chemical liquid injection method characterized by injecting into sandy or gravel ground at an injection speed of more than 40 liters / minute and not more than 40 liters / minute.
【0010】<請求項2記載の発明>軸方向に間隔を置
いた複数の部位に注入口を有する注入外管と、前記注入
外管内に挿入し移動可能な注入内管とを用い、前記注入
内管を前記注入外管内において軸方向に移動させて、異
なる部位において注入口から薬液を注入する請求項1記
載の薬液注入工法。<Invention according to claim 2> The injection is performed by using an outer injection tube having injection ports at a plurality of axially spaced sites and an inner injection tube which can be inserted into and moved into the outer injection tube. 2. The chemical solution injection method according to claim 1, wherein the inner tube is moved in the axial direction within the outer tube for injection, and a medical solution is injected from different inlets through different inlets.
【0011】<請求項3記載の発明>前記注入外管に透
孔が形成され、この透孔を軸方向に跨いで前記パッカー
が設けられ、そのパッカーの軸方向前後端部が注入外管
に液密に封止され、前記透孔を通して前記パッカー内に
膨出用流体を送り込んでパッカーの膨出を図る請求項2
記載の薬液注入工法。<Invention of Claim 3> A through-hole is formed in the outer tube for injection, and the packer is provided so as to straddle the through-hole in the axial direction, and the front and rear ends of the packer in the axial direction are connected to the outer tube for injection. 3. The packer is sealed in a liquid-tight manner, and a swelling fluid is sent into the packer through the through-hole to expand the packer.
Chemical solution injection method described.
【0012】<請求項4記載の発明>前記注入外管に透
孔が形成され、この透孔を覆って変形可能なスリーブが
設けられ、このスリーブを軸方向に跨いで前記パッカー
が設けられ、そのパッカーの軸方向前後端部が注入外管
に液密に封止されたものを用い、前記膨出用流体を前記
透孔を通して送り込み、この送り込み時においてスリー
ブが変形させて膨出用流体をパッカー内に流入させパッ
カーの膨出を図り、流入完了状態において、スリーブを
復元させて前記透孔を閉塞させる請求項2記載の薬液注
入工法。<Invention according to claim 4> A through hole is formed in the outer injection tube, a deformable sleeve is provided to cover the through hole, and the packer is provided across the sleeve in the axial direction. Using the packer whose front and rear ends in the axial direction are liquid-tightly sealed in an outer filling tube, the swelling fluid is fed through the through-hole, and the sleeve is deformed at the time of the feeding, thereby causing the swelling fluid to flow. 3. The chemical liquid injection method according to claim 2, wherein the packing is bulged by flowing into the packer, and in a completed flow state, the sleeve is restored to close the through-hole.
【0013】[0013]
【発明の実施の形態】以下本発明を図面に示す実施の形
態によってさらに詳説する。 <注入装置例>まず、注入装置について説明すると、図
1は外管10を示し、第1管1の壁面に透孔4が形成さ
れ、この透孔4を覆って変形可能なゴムなどの可撓性ス
リーブ5が設けられ、このスリーブ5を跨いで、軸方向
前後がそれぞれ、第1管1と螺合した第2管2および第
3管3に液密に封止されたゴムなどの可撓性のパッカー
6が装着されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. <Example of Injecting Apparatus> First, the injecting apparatus will be described. FIG. 1 shows an outer tube 10, in which a through hole 4 is formed in a wall surface of the first tube 1, and a rubber or the like which can be deformed to cover the through hole 4. A flexible sleeve 5 is provided. Across the sleeve 5, the front and rear portions in the axial direction are made of rubber or the like which is sealed in a liquid-tight manner with the second tube 2 and the third tube 3 screwed with the first tube 1, respectively. A flexible packer 6 is mounted.
【0014】図3に示されているように、外管10は単
位管として用意され、単位管の第2管2と他の単位管の
第3管3とが螺合連設されて長尺の注入外管とされる。As shown in FIG. 3, the outer tube 10 is prepared as a unit tube, and the second tube 2 of the unit tube and the third tube 3 of the other unit tube are screwed and connected to be long. The outer tube of the injection.
【0015】連設注入外管とする場合、パッカー6は軸
方向に間隔を置いて複数、たとえば3個以上外面部に装
着される。さらに、隣接パッカー6,6の間にそれぞれ
注入口7が、図1に示すように、第3管3に形成されて
いる。注入口7は一つのほか、図1に示すように複数、
たとえば4段で各段において90度間隔で合計16個形
成することができる。これらの注入口7,7…は、周辺
地盤からの砂粒子の侵入防止手段を採用することが望ま
しく、この砂粒子の侵入防止手段としては、各段を図1
に示すように、ゴムなどの可撓性スリーブ8で覆う、あ
るいは薬液の送給圧により破断するたとえば塩化ビニル
製の被膜を各段もしくは全体にわたって被覆するなどの
態様を採用できる。In the case of a continuous injection outer tube, a plurality of, for example, three or more, packers 6 are mounted on the outer surface at intervals in the axial direction. Further, an inlet 7 is formed in the third pipe 3 between the adjacent packers 6, 6, as shown in FIG. As shown in FIG.
For example, a total of 16 stages can be formed in four stages at 90-degree intervals in each stage. It is desirable that these injection ports 7, 7,... Adopt means for preventing sand particles from entering the surrounding ground.
As shown in (1), it is possible to adopt a mode of covering with a flexible sleeve 8 made of rubber or the like, or covering each step or the whole with a film made of, for example, vinyl chloride which is broken by the supply pressure of the chemical solution.
【0016】一方、図1に示すように、注入内管20が
用意される。この注入内管20は外管10に挿入可能で
あり、外管10内面に吐出口22の前後が液密に密着
し、かつ内部に薬液を圧送するものであれば限定されな
いが、その構造例として、単純に、薬液の送給路を有す
る内管主体21の吐出口22の前後に、ゴムなどのパッ
カー部材23,24を設けたもののほか、特公昭63−
44893号公報の第4図に図示されたものをそのまま
利用することができる。On the other hand, as shown in FIG. 1, an inner tube 20 for injection is prepared. The injection inner tube 20 is not limited as long as it can be inserted into the outer tube 10, as long as the inner and outer surfaces of the outer tube 10 are in close contact with the front and rear of the discharge port 22 in a liquid-tight manner and pump the chemical solution into the inside. In addition to simply providing rubber and other packer members 23 and 24 before and after a discharge port 22 of an inner pipe main body 21 having a chemical solution supply path,
What is shown in FIG. 4 of 44893 can be used as it is.
【0017】<第1の施工例>かかる注入装置を用いて
施工を行うに際しては、まず、図2に示すように、対象
地盤30を所定深度まで掘削して挿入孔31を形成す
る。この場合、挿入孔31の崩落防止のためにケーシン
グ50を用いて削孔することが望ましい。<First Construction Example> When construction is performed using such an injection device, first, as shown in FIG. 2, the target ground 30 is excavated to a predetermined depth to form an insertion hole 31. In this case, it is desirable to drill using the casing 50 to prevent the insertion hole 31 from collapsing.
【0018】そして、注入外管10を挿入孔31内に挿
入する。Then, the outer tube for injection 10 is inserted into the insertion hole 31.
【0019】その後、ケーシング50を用いて挿入孔3
1を形成した場合には、これを撤去する。これにより、
注入外管10を挿入孔31内に相対的に挿入されること
となる。注入外管10は直接またはケーシング50とと
もに建込むことができるので、この意味で注入外管10
を挿入孔31内に「相対的に挿入する」との文言を本発
明において使用するものである。Thereafter, the casing 50 is used to insert the insertion hole 3.
If a 1 is formed, remove it. This allows
The outer injection tube 10 is relatively inserted into the insertion hole 31. Since the outer injection tube 10 can be built directly or together with the casing 50, in this sense the outer injection tube 10
Is used in the present invention.
【0020】しかる後に、パッカー6位置に吐出口22
を位置させてそのパッカー6の透孔4と吐出口22とを
連通させた状態で、注入内管20内の流路を通して膨出
用流体40、好適には固結性材料たとえばセメントもし
くはセメントベントナイトなどを圧送し、隣接するパッ
カー6,6のそれぞれの内部に送り込んでこれらのパッ
カー6,6を膨出させて挿入孔31壁面に密着させる。Thereafter, the discharge port 22 is placed at the position of the packer 6.
In the state where the through hole 4 of the packer 6 and the discharge port 22 are in communication with each other, the swelling fluid 40, preferably a solidifying material such as cement or cement bentonite, is passed through the flow path in the injection inner pipe 20. And the like are sent under pressure to the inside of each of the adjacent packers 6, 6 so that these packers 6, 6 are bulged and adhere to the wall surface of the insertion hole 31.
【0021】この膨出用流体40の送り込みに際して
は、前述のように、注入内管20を用いてその内部流路
を通して吐出口22から吐出させるほか、他の適宜の手
段を用いることができる。いすれにしても、膨出用流体
40は透孔4を通り、その送給圧によりスリーブ5が変
形し、たとえばそのスリーブ5両端部を第1管1の外面
と離間させながらパッカー6内に送り込まれる。パッカ
ー6が十分に膨出した時点で、膨出用流体40の送り込
みを停止する。すると、スリーブ5は復元して、透孔4
を封止する。このパッカー6の膨出は、少なくとも隣接
パッカー6,6において行えばよいが、必要ならば対象
のパッカーの全てを順次膨出させておいてもよい。When the swelling fluid 40 is fed, other suitable means can be used in addition to discharging the fluid from the discharge port 22 through the internal flow path using the injection inner tube 20 as described above. In any case, the swelling fluid 40 passes through the through-hole 4 and deforms the sleeve 5 by the feed pressure. For example, the sleeve 5 is inserted into the packer 6 while separating both ends of the sleeve 5 from the outer surface of the first pipe 1. Sent in. When the packer 6 has swelled sufficiently, the feeding of the swelling fluid 40 is stopped. Then, the sleeve 5 is restored and the through hole 4 is restored.
Is sealed. The swelling of the packer 6 may be performed at least in the adjacent packers 6, 6, but if necessary, all of the target packers may be sequentially swelled.
【0022】かかる段取りが終了したならば、あるいは
注入内管20を膨出用流体40の送り込みに用いるので
あればそのまま、注入外管10内に注入内管20を挿入
し、パッカー6,6を作用させた状態で、注入内管20
に膨出用流体40に代えて薬液を圧送して吐出口22か
らから吐出させ、注入口7,7…を通して、可撓性スリ
ーブ8を変形させつつもしくは被膜を破断させて、薬液
を周辺地盤に向かって浸透注入させる。If the setup is completed, or if the inner tube 20 is used for feeding the swelling fluid 40, the inner tube 20 is inserted into the outer tube 10 and the packers 6, 6 are removed. In the operated state, the injection inner tube 20
In place of the swelling fluid 40, a chemical is pumped out and discharged from the discharge port 22, and through the inlets 7, 7,... And infiltrate into it.
【0023】薬液の注入に際しては、好適には注入内管
20を外管10の最深部まで挿入し、隣接パッカーをま
たは前述のように全てのパッカーを膨出させた後に、注
入内管20を対応する注入口7,7…形成部位に対応す
る1スナップごと引き上げて順次注入することが望まし
い。逆に、上部から最深部に向かうステップダウン方式
や適宜の選択位置順で上下させる方式を採用できる。When injecting the chemical, preferably, the inner tube 20 is inserted to the deepest portion of the outer tube 10, and after the adjacent packers or all the packers are bulged as described above, the inner tube 20 is injected. It is desirable that the corresponding inlets 7, 7,. Conversely, a step-down method from the upper part to the deepest part, or a method of moving up and down in an appropriate selection position order can be adopted.
【0024】この場合、従来のように予めセメントベン
トナイト充填材を充填し、薬液の圧送圧によりそのセメ
ントベントナイト充填材を割裂させながら、地盤内に薬
液を注入する方法とは異なり、図5に示すように、隣接
パッカー6,6と挿入孔31壁面と注入外管10外面と
で囲まれる領域は充填材が存在しない空間であるから、
注入口7,7…を通して注入された薬液Gは、隣接パッ
カー6,6間において、比較的広い空間に満たされた状
態で、地盤30内に注入される。In this case, unlike the conventional method in which the cement bentonite filler is filled in advance and the chemical liquid is injected into the ground while splitting the cement bentonite filler by the pressure of the chemical liquid, as shown in FIG. As described above, the region surrounded by the adjacent packers 6, 6 and the wall surface of the insertion hole 31 and the outer surface of the injection outer tube 10 is a space where no filler is present.
The chemical liquid G injected through the inlets 7, 7,... Is injected into the ground 30 between the adjacent packers 6, 6 while being filled in a relatively large space.
【0025】したがって、その空間に面する挿入孔31
の全体から地盤30内に浸透するので、仮に高い注入速
度であっても割裂を生じることなく浸透することが実験
の結果から判明した。その結果、一つの注入ゾーンから
大量の薬液を注入することが可能となり、地盤内に浸透
した薬液は遠くまで浸透注入されることが判明した。実
験の結果では、注入径として約5mを得ることができ
た。Therefore, the insertion hole 31 facing the space
It has been found from the results of experiments that the water penetrates into the ground 30 from the entire surface of the ground without penetrating even if the injection speed is high. As a result, it became possible to inject a large amount of chemical solution from one injection zone, and it was found that the chemical solution that had permeated the ground was permeated and injected far away. As a result of the experiment, an injection diameter of about 5 m was obtained.
【0026】薬液として、水ガラス系の薬液、特にシリ
カゾル系薬液を用いることが浸透注入の点で好ましい。
土中のゲルタイムとしては1〜10時間程度が望まし
い。注入速度(地盤からみれば浸透許容速度)として
は、40リットル/分程度まで注入できる。As the chemical, it is preferable to use a water glass-based chemical, particularly a silica sol-based chemical, from the viewpoint of permeation injection.
The gel time in the soil is preferably about 1 to 10 hours. The injection speed (permeation permissible speed as viewed from the ground) can be injected up to about 40 liters / minute.
【0027】パッカーの膨出用流体としては、セメント
ベントナイトのほか、水や空気を用いることもできる
が、セメントベントナイトであると、これがやがて硬化
し、強固にパッカー6を挿入孔31の孔壁面に密着させ
ることができる点で好ましい。パッカー6,6間の寸法
としては、10cm〜2m、特に好ましくは25〜50cm
程度とすることができる。As the fluid for swelling the packer, water or air can be used in addition to cement bentonite. However, in the case of cement bentonite, it hardens soon, and the packer 6 is firmly attached to the wall surface of the insertion hole 31. This is preferable in that it can be closely attached. The dimension between the packers 6 and 6 is 10 cm to 2 m, particularly preferably 25 to 50 cm.
Degree.
【0028】図7に示すように、パッカー6とパッカー
6,6間寸法の合計長は、目標の改良体Zの直径(たと
えば5〜6m程度)にほぼ一致させるのが好ましい。As shown in FIG. 7, it is preferable that the total length of the dimensions between the packer 6 and the packers 6 and 6 substantially coincides with the target diameter of the improved body Z (for example, about 5 to 6 m).
【0029】<第2の施工例>本発明は、臨海地区のほ
ぼ均一の砂地盤において液状化対策や地盤強化のための
工法として特に有効であるが、その地盤が、たとえば図
8に示すように、砂礫層などを含んでいる場合には、透
水係数がより大きい当該砂礫層を通して薬液が逸走する
可能性がある。そこで、主パッカー6長の中間または中
央を挟んで、分割パッカー6A,6Aに分割し、その間
に副注入口7Aを形成し、この副注入口7Aを砂礫層に
位置させ、分割パッカー6A,6Aを膨出した後に、副
注入口7Aからセメントベントナイトや数秒〜数分のゲ
ルタイムを示す瞬結材などを注入し、砂礫層に荒詰め
し、続いて、主注入口7から薬液を注入すると、薬液に
逸走を生じることなく、均一な改良体を造成できる。<Second Construction Example> The present invention is particularly effective as a liquefaction countermeasure method and a method for strengthening the ground in a substantially uniform sandy ground in a seaside area. The ground is, for example, as shown in FIG. In addition, when a gravel layer or the like is included, there is a possibility that the chemical solution escapes through the gravel layer having a higher hydraulic conductivity. Therefore, the main packer 6 is divided into divided packers 6A, 6A with the middle or the center of the main packer 6 interposed therebetween, and a sub-injection port 7A is formed therebetween. After swelling, cement bentonite or a flash binder showing a gel time of several seconds to several minutes is injected from the sub-injection port 7A, roughened into the gravel layer, and subsequently, a chemical solution is injected from the main injection port 7, A uniform improved body can be created without running out of the chemical solution.
【0030】<第3の施工例>改良体は、図6に示すよ
うに、軸方向に連続的にほか、図9に示すように、不連
続的に造成するものでもよい。この場合、同図のよう
に、隣接パッカー6,6間を飛ばして次の隣接パッカー
6,6間において薬液を注入するとき、飛ばそうとする
隣接パッカー6,6間に、予めセメントベントナイトな
どのシールグラウト材Xを注入して孔壁との間に充填し
ておくのが望ましい。これにより、次の隣接パッカー
6,6間において注入する薬液が、パッカー6と孔壁を
通って、飛ばした隣接パッカー6,6間に回り込むこと
を防止できる。<Third Example of Construction> The improved body may be formed continuously in the axial direction as shown in FIG. 6 or discontinuously as shown in FIG. In this case, as shown in the figure, when the chemical solution is injected between the adjacent packers 6 and 6 by skipping between the adjacent packers 6 and 6, the cement bentonite or the like is previously inserted between the adjacent packers 6 and 6 to be skipped. It is desirable that the seal grout material X is injected and filled between the seal grout material X and the hole wall. This can prevent the chemical solution injected between the next adjacent packers 6 and 6 from flowing between the adjacent adjacent packers 6 and 6 through the packer 6 and the hole wall.
【0031】(本発明の注入原理)前述の利点をもたら
す本発明の注入原理を改めて説明すると、図10(A)
に示すように、従来の二重管ダブルパッカー注入工法
は、予め孔壁との間にセメントベントナイト充填材Sを
充填し、薬液の圧送圧によりそのセメントベントナイト
充填材Sを割裂させながら、地盤内に薬液Gを注入する
方法ものである。したがって、充填材Sの割裂部位はご
く少数であり、その割裂部位からのみ薬液Gが注入され
るため、地盤に対する浸透面積は割裂部位に面する面積
の合計であり、浸透面積はきわめて小さい。(Injection Principle of the Present Invention) The injection principle of the present invention which provides the above-mentioned advantages will be described again.
As shown in the figure, in the conventional double pipe double packer injection method, a cement bentonite filler S is filled beforehand with a hole wall, and the cement bentonite filler S is split by the pressure feeding of a chemical solution. Is a method of injecting a chemical solution G into the container. Therefore, the number of cleavage sites of the filler S is very small, and the chemical solution G is injected only from the cleavage site. Therefore, the permeation area to the ground is the sum of the areas facing the cleavage site, and the permeation area is extremely small.
【0032】これに対して、本発明では、図10(B)
に示すように、充填材Sを充填していない空間全体から
薬液Gを注入するものであるために、薬液Gがその広い
空間に満たされつつ地盤30内に注入される。したがっ
て、その空間に面する挿入孔31の全体を浸透対象面積
として浸透注入されるので、一つの注入ゾーンから大量
の薬液を注入することが可能となり、地盤内に浸透した
薬液は遠くまで浸透注入される。On the other hand, in the present invention, FIG.
As shown in (1), since the chemical liquid G is injected from the entire space not filled with the filler S, the chemical liquid G is injected into the ground 30 while filling the wide space. Therefore, since the whole of the insertion hole 31 facing the space is permeated and injected with the permeation target area, a large amount of the chemical can be injected from one injection zone, and the chemical permeated into the ground can be permeated and injected far. Is done.
【0033】実際に、従来の二重管ダブルパッカー注入
工法と本発明の注入工法とを、吐出量と注入圧力との関
係を比較すると、表1及び図11の結果が得られた。こ
の結果からも、上記の本発明の注入原理が確認できた。Actually, when the relationship between the discharge amount and the injection pressure was compared between the conventional double pipe double packer injection method and the injection method of the present invention, the results shown in Table 1 and FIG. 11 were obtained. This result also confirmed the above-described injection principle of the present invention.
【0034】[0034]
【表1】 [Table 1]
【0035】[0035]
【発明の効果】以上のとおり、本発明によれば、浸透注
入による同心円筒状の改良体を造成することができると
ともに、たとえば直径で約5m程度の大形の改良体を造
成できるなどの利点がもたらされる。As described above, according to the present invention, it is possible to form a concentric cylindrical improved body by permeation injection, and to form a large-sized improved body having a diameter of about 5 m, for example. Is brought.
【図1】注入装置例の縦断面図である。FIG. 1 is a longitudinal sectional view of an example of an injection device.
【図2】本発明方法の第1段階の説明図である。FIG. 2 is an explanatory diagram of a first stage of the method of the present invention.
【図3】本発明方法の第2段階の説明図である。FIG. 3 is an explanatory diagram of a second stage of the method of the present invention.
【図4】本発明方法の第3段階の説明図である。FIG. 4 is an explanatory diagram of a third stage of the method of the present invention.
【図5】注入部分及び注入状態の要部説明図である。FIG. 5 is an explanatory view of an injection portion and a main part of an injection state.
【図6】改良体の造成終了段階の説明図である。FIG. 6 is an explanatory diagram of a stage at which the formation of the improved body is completed.
【図7】パッカー長と改良体の直径との関係の説明図で
ある。FIG. 7 is an explanatory diagram of a relationship between a packer length and a diameter of an improved body.
【図8】第2の施工例の説明図である。FIG. 8 is an explanatory diagram of a second construction example.
【図9】第3の施工例の説明図である。FIG. 9 is an explanatory diagram of a third construction example.
【図10】従来例との対比の下で本発明の注入原理の説
明図である。FIG. 10 is an explanatory diagram of the injection principle of the present invention in comparison with a conventional example.
【図11】従来の二重管ダブルパッカー注入工法と本発
明の注入工法とを、吐出量と注入圧力との関係での比較
結果のグラフである。FIG. 11 is a graph showing a comparison result between the conventional double pipe double packer injection method and the injection method of the present invention in the relationship between the discharge amount and the injection pressure.
【符号の説明】 1…第1管、2…第2管、3…第3管、4…透孔、5…
スリーブ、6…パッカー7…注入口、8…皮膜、10…
外管、20…注入内管、21…内管主体、22…吐出
口、23、24…パッカー部材、30…対象地盤、31
…挿入孔、40…膨張用流体、50…ケーシング、G…
薬液、Z…改良体。[Description of Signs] 1 ... first pipe, 2 ... second pipe, 3 ... third pipe, 4 ... through-hole, 5 ...
Sleeve, 6 ... Packer 7 ... Filler, 8 ... Film, 10 ...
Outer pipe, 20: Injection inner pipe, 21: Inner pipe main body, 22: Discharge port, 23, 24: Packer member, 30: Target ground, 31
... insertion hole, 40 ... expansion fluid, 50 ... casing, G ...
Chemical solution, Z: improved body.
Claims (4)
形成するとともに、軸方向に間隔を置いて複数のパッカ
ーを外面部に有し、かつ隣接するパッカー間に注入口を
有する注入外管を前記挿入孔内に相対的に挿入し、前記
隣接する両パッカーを膨出させて前記挿入孔壁面に密着
させ、このとき前記隣接パッカーと挿入孔壁面と注入外
管外面とで囲まれる領域を空間とした状態で、前記注入
口から薬液を前記空間に満たしつつ、10リットル/分
を超え40リットル/分以下の注入速度をもって砂質ま
たは砂礫地盤に注入することを特徴とする薬液注入工
法。An excavator having a plurality of packers on an outer surface thereof spaced apart in an axial direction and having an inlet between adjacent packers, while excavating a target ground to a predetermined depth to form an insertion hole. A tube is relatively inserted into the insertion hole, and the two adjacent packers are bulged and brought into close contact with the wall surface of the insertion hole. At this time, an area surrounded by the adjacent packer, the wall surface of the insertion hole, and the outer surface of the injection outer tube. And filling the space from the inlet with a chemical solution at a rate of more than 10 liters / minute and not more than 40 liters / minute into sandy or gravel ground. .
を有する注入外管と、前記注入外管内に挿入し移動可能
な注入内管とを用い、前記注入内管を前記注入外管内に
おいて軸方向に移動させて、異なる部位において注入口
から薬液を注入する請求項1記載の薬液注入工法。2. An outer injection tube having injection ports at a plurality of axially spaced sites, and an inner injection tube movable into and inserted into the outer injection tube, wherein the inner injection tube is connected to the outer injection tube. 2. The chemical liquid injection method according to claim 1, wherein the liquid chemical is injected from different positions in the pipe by moving the liquid axially.
を軸方向に跨いで前記パッカーが設けられ、そのパッカ
ーの軸方向前後端部が注入外管に液密に封止され、前記
透孔を通して前記パッカー内に膨出用流体を送り込んで
パッカーの膨出を図る請求項2記載の薬液注入工法。3. A through hole is formed in the outer tube for injection, and the packer is provided across the through hole in the axial direction. The front and rear ends of the packer in the axial direction are sealed in a liquid-tight manner with the outer tube for injection. 3. The chemical liquid injection method according to claim 2, wherein a swelling fluid is sent into the packer through the through-hole to expand the packer.
を覆って変形可能なスリーブが設けられ、このスリーブ
を軸方向に跨いで前記パッカーが設けられ、そのパッカ
ーの軸方向前後端部が注入外管に液密に封止されたもの
を用い、 前記膨出用流体を前記透孔を通して送り込み、この送り
込み時においてスリーブが変形させて膨出用流体をパッ
カー内に流入させパッカーの膨出を図り、流入完了状態
において、スリーブを復元させて前記透孔を閉塞させる
請求項2記載の薬液注入工法。4. A through-hole is formed in the outer injection tube, a deformable sleeve is provided to cover the through-hole, and the packer is provided across the sleeve in the axial direction. Using the one whose end is liquid-tightly sealed in the outer tube for injection, the swelling fluid is fed through the through-hole, and at the time of this feeding, the sleeve is deformed to cause the swelling fluid to flow into the packer and to be packed. 3. The chemical solution injection method according to claim 2, wherein the sleeve is restored to close the through-hole in a state where the inflow is completed and the inflow is completed.
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JP19630798 | 1998-07-10 | ||
JP10-196307 | 1998-07-10 | ||
JP2000072674A JP3313351B2 (en) | 1998-07-10 | 2000-03-15 | Chemical injection method |
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JP11195521A Division JP3102786B2 (en) | 1998-07-10 | 1999-07-09 | Chemical solution injection method and injection device used for this method |
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JP2000273859A true JP2000273859A (en) | 2000-10-03 |
JP3313351B2 JP3313351B2 (en) | 2002-08-12 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2009002154A (en) * | 2008-08-25 | 2009-01-08 | Toa Harbor Works Co Ltd | Soil improvement agent injection method and apparatus |
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JP7129052B2 (en) * | 2017-10-24 | 2022-09-01 | 戸田建設株式会社 | Injection outer tube and chemical injection method |
JP7129051B2 (en) * | 2017-10-24 | 2022-09-01 | 戸田建設株式会社 | Injection outer tube and chemical injection method |
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Cited By (1)
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JP2009002154A (en) * | 2008-08-25 | 2009-01-08 | Toa Harbor Works Co Ltd | Soil improvement agent injection method and apparatus |
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