JP3500464B2 - Ground injection method - Google Patents
Ground injection methodInfo
- Publication number
- JP3500464B2 JP3500464B2 JP30480599A JP30480599A JP3500464B2 JP 3500464 B2 JP3500464 B2 JP 3500464B2 JP 30480599 A JP30480599 A JP 30480599A JP 30480599 A JP30480599 A JP 30480599A JP 3500464 B2 JP3500464 B2 JP 3500464B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- ground
- layer
- space
- different
- 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
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は複数本の独立した細管
を結束してなる結束注入管を用いた地盤注入工法に係
り、特に、地盤状況が各層毎に異なる地盤に対して、こ
れら各層毎に最適な注入を同時に達成し得るのみなら
ず、地盤中の縦方向、横方向への立体的な同時注入をも
可能であり、かつ、大きな円柱状ないしは円筒状浸透源
から注入し得、このため、多量の注入液を低圧で円柱状
に土粒子間浸透して固結することができ、注入効果に優
れ、かつ、注入工期も短縮され、経済的に優れた地盤注
入工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground pouring method using a bundle pouring pipe formed by bundling a plurality of independent thin tubes, and particularly to the ground where the ground condition is different for each layer. It is possible not only to achieve the optimum injection simultaneously, but also to perform three-dimensional simultaneous injection in the vertical and horizontal directions in the ground, and to inject from a large cylindrical or cylindrical infiltration source. Therefore, a large amount of the injection liquid can penetrate into the columnar soil particles at a low pressure to be solidified, the injection effect is excellent, and the injection period is shortened.
【０００２】[0002]
【従来の技術】地盤は通常、各層毎に透水係数や間隙率
が異なるため、各層毎に地盤状況が異なるものである。
このため、従来、３３cmごとに、あるいは５０cmごとに
注入ステージを上げながら瞬結グラウトと緩結グラウト
を交互に注入する二重管ロッド注入工法、あるいはセメ
ント系一次注入材を注入の後、溶液型二次注入材を注入
する二重管ダブルパッカー工法が用いられてきた。2. Description of the Related Art In the ground, since the water permeability and the porosity of each layer are different, the ground condition is different for each layer.
Therefore, conventionally, double tube rod injection method that alternately injects quick setting grout and slow setting grout while raising the injection stage every 33 cm or every 50 cm, or after injection of cement-based primary injection material, solution type The double pipe double packer method of injecting the secondary injection material has been used.
【０００３】さらに、この種の地盤への薬液注入に際し
て、従来、図示しないが、軸方向の異なる位置に複数の
吐出口を有する二重管等の注入管が用いられ、注入に際
して、この注入管を地盤中に埋設の後、注入管上端から
注入材を導入して上述複数の吐出口から前記注入材を地
盤中に同時注入していた。Further, in the case of injecting a chemical solution into the ground of this kind, although not shown, an injection pipe such as a double pipe having a plurality of discharge ports at different axial positions has been conventionally used. After being embedded in the ground, the injection material was introduced from the upper end of the injection pipe and the injection material was simultaneously injected into the ground through the plurality of discharge ports.
【０００４】さらにまた、上述の注入管を複数本、地盤
中に間隙をあけて埋設の後、孔壁と注入管の間にシール
用グラウトを填充して注入管と孔壁の間にシールを形成
してのち、上述と同様にこれら注入管の吐出口を通じて
シールを破って注入材を地盤中に注入していた。Furthermore, after a plurality of the above-mentioned injection pipes are buried in the ground with a gap, a sealing grout is filled between the hole wall and the injection pipe to form a seal between the injection pipe and the hole wall. After being formed, the injection material was injected into the ground by breaking the seal through the discharge ports of these injection pipes as described above.
【０００５】[0005]
【発明が解決すべき課題】上述従来の注入工法の課題に
ついて図４〜図６を用いて説明する。図４は二重管ロッ
ド注入工法あるいはロッド注入工法の説明図てあって、
注入管ロッド20を通して送液された注入液は基本的には
注入管ロッド20の径r0に相当する球状の浸透源21から球
状に浸透される。22は球状の浸透固結体である。Problems to be solved by the conventional injection method will be described with reference to FIGS. Figure 4 is an illustration of the double pipe rod injection method or rod injection method.
The injection liquid sent through the injection pipe rod 20 is basically permeated into a spherical shape from a spherical permeation source 21 corresponding to the diameter r 0 of the injection pipe rod 20. 22 is a spherical penetrating solid.
【０００６】上述の浸透源21は径r0であって、極めて小
さいため、経済的な吐出速度１０ｌ〜２０ｌ／分では土
粒子間浸透が困難で、脈状注入になりやすい。しかも、
瞬結グラウトを先行して注入しても該グラウトは脈状に
走ってしまい、その後のゲル化時間の長い注入液はやは
り脈状ゲルに沿って脈状に送られるという現象が生じや
すい。さらに、注入液は注入管ロッドまわりから矢印の
ように逸出してしまう。また、仮に注入液が脈状に逃げ
なくても、小さな浸透源からでは、注入液を長時間にわ
たって注入し続け、広範囲を浸透固結することは不可能
である。この理由は小さな浸透源の周辺の土粒子間に、
ポンプ圧で破壊できないほどゲルが密実に詰まってしま
い、このため、注入圧が異常に上昇し、あるいは隆起し
てしまうからである。Since the permeation source 21 has a diameter r 0 and is extremely small, permeation between soil particles is difficult at an economical discharge rate of 10 to 20 l / min, and pulse injection is likely to occur. Moreover,
Even if the quick-setting grout is injected in advance, the grout runs in a pulse shape, and the infusion solution having a long gelation time thereafter tends to be sent in a pulse shape along the pulse gel. Furthermore, the injection liquid escapes around the injection tube rod as shown by the arrow. Even if the infusion solution does not escape in a pulsed manner, it is impossible to continue injecting the infusion solution from a small permeation source for a long time and permeate and consolidate a wide range. The reason for this is that between the soil particles around the small infiltration source,
This is because the gel is so tightly packed that it cannot be destroyed by the pump pressure, and thus the injection pressure rises abnormally or rises.
【０００７】図５は注入管ロッドを用いた他の注入工法
の説明図であって、図４の注入ロッド20を所定深度まで
挿入してのち、所定の長さ引き上げて円筒状の浸透源21
を形成する。この浸透源21は円筒状の空間であって、こ
の空間から注入液を注入する。この場合も、図４と同
様、注入液は注入管ロッド20のまわりから矢印方向に逸
出してしまい、予定深度への浸透が困難となる。FIG. 5 is an explanatory view of another injection method using an injection pipe rod. The injection rod 20 of FIG. 4 is inserted to a predetermined depth and then pulled up to a predetermined length to form a cylindrical permeation source 21.
To form. The permeation source 21 is a cylindrical space, and the injection liquid is injected from this space. In this case as well, similar to FIG. 4, the injection liquid escapes from around the injection pipe rod 20 in the direction of the arrow, making it difficult to permeate to the intended depth.
【０００８】図６は二重管ダブルパッカー工法の説明図
である。この工法は外管12と孔壁９との間、すなわち、
注入孔８の中にはスリーブグラウト23を充填して外管12
をスリーブグラウト23で覆い、注入液の上方への逸脱を
防止するものである。この工法は先端に吐出口26を有
し、この吐出口26の上下にリング状のゴムパッカー25、
25を備えた内管24を外管12に挿入し、注入液を内管24の
管路および吐出口26を通して外管吐出口14からゴムスリ
ーブ15を押し開け、スリーブグラウト23を破って注入す
るものであり、球状の浸透源r0から注入する点は図４の
工法と同じである。これらの工法では、液状化防止工事
等、大容量連続注入のような地盤改良は到底困難であっ
た。FIG. 6 is an explanatory view of the double pipe double packer method. This method is between the outer tube 12 and the hole wall 9, that is,
A sleeve grout 23 is filled in the injection hole 8 and the outer tube 12
Is covered with a sleeve grout 23 to prevent the injected liquid from escaping upward. This method has a discharge port 26 at the tip, and a ring-shaped rubber packer 25 above and below the discharge port 26,
Insert the inner tube 24 provided with 25 into the outer tube 12, and inject the injection liquid through the conduit of the inner tube 24 and the discharge port 26 from the outer tube discharge port 14 to open the rubber sleeve 15 and break the sleeve grout 23 to inject it. This is the same as the construction method of FIG. 4 in that it is injected from a spherical permeation source r 0 . With these construction methods, ground improvement such as liquefaction prevention work and continuous injection with a large volume was extremely difficult.
【０００９】通常の注入工事では、注入孔間隔は1.０ｍ
程度であるが、それに対して液状化防止工事では経済性
から1.５ｍ〜４ｍとせざるを得ない。例えば、注入孔間
隔を２ｍの正方向配置にする場合、
注入管の埋設間隔 Ｐ＝２ｍ×２ｍの正方形配置にし、
注入速度 ｆ＝２０１／分
注入管１孔当り改良平面積は Ａｐ＝２ｍ×２ｍ＝４m2であり、
１ステージ当り改良土量（m3) を Ｖ＝２ｍ（１ステージ当りの改良厚さ）
×４m2＝８m3とすると、
１ステージ当り注入量（kl）
Ｑ＝Ｖｘ（0.３５〜0.０４) ＝2.８m3〜3.２ｍ＝3.０m3（平均）
（0.３５〜0.０４：注入率）
１ステージ当り注入時間
ｔ1 ＝３kl÷0.０２kl／分＝１５０分
＝2.５時間（注入継続時間）
と長時間による注入を行わなくてはならない。In normal injection work, the injection hole interval is 1.0 m
On the other hand, in the liquefaction prevention construction, it is unavoidable that the length will be 1.5 to 4 m due to its economical efficiency. For example, when the injection hole interval is 2 m in the forward direction, the embedding interval of the injection pipe is P = 2 m × 2 m in a square arrangement, the injection speed f = 201 / min, and the improved flat area per hole of the injection pipe is Ap = 2 m × 2m = 4m 2 and the amount of improved soil per stage (m 3 ) is V = 2m (improved thickness per stage) × 4m 2 = 8m 3 Injection amount per stage (kl) Q = Vx (0.35-0.04) = 2.8 m 3 -3.2 m = 3.0 m 3 (average) (0.35-0.04: injection rate) Injection time per stage t 1 = 3 kl / 0. 02 kl / min = 150 minutes = 2.5 hours (infusion duration), long-term infusion must be performed.
【００１０】また、注入孔間隔を４ｍの正方向配置にす
る場合、
Ａｐ＝４ｍ×４ｍ＝１６m2、
１ステージの改良土量は、
Ｖ＝２ｍ（改良厚さ）×１６m2
＝３２m3、
１ステージ注入量（kl）は
Ｑ＝Ｖｘ（0.３５〜0.４０）
＝３２×（0.３５〜0.４０）
＝１1.２〜１2.８kl≒１２kl（平均）であり、
注入速度ｆ＝２０１／分とすると、１ステージ当り注入
時間
ｔ＝１２kl÷0.０２kl
＝６００分
＝１０時間
の注入を行わなければならない。Further, when the injection holes are arranged in the positive direction of 4 m, Ap = 4 m × 4 m = 16 m 2 , the amount of improved soil in one stage is V = 2 m (improved thickness) × 16 m 2 = 32 m 3 , The injection amount per stage (kl) is Q = Vx (0.35-0.40) = 32 × (0.35-0.40) = 11.2-12.8kl≈12kl (average), and the injection rate If f = 201 / min, the injection time per stage must be t = 12 kl / 0.02 kl = 600 minutes = 10 hours.
【００１１】したがって、有効浸透源を大きくすること
が必要である。このようにすれば、大きな吐出量で注入
しても、浸透源の単位表面積当りの注入速度は小さくな
り、かつ、ゲルで目づまりすることがないので、低圧で
大量の注入液を注入しつづけて広範囲の地盤を固結する
ことが可能になる。Therefore, it is necessary to increase the effective permeation source. By doing this, even if a large amount of liquid is injected, the injection rate per unit surface area of the permeation source will be low, and gel will not clog, so a large amount of injection liquid will continue to be injected at low pressure. It is possible to solidify a wide range of ground.
【００１２】この問題に対処するために、出願人は特開
平７−３００８４９号公報に示される技術を開発し、特
許第２８５２７２１号として特許を受けている。In order to deal with this problem, the applicant has developed the technique disclosed in Japanese Patent Laid-Open No. 7-200849 and has been granted a patent as Japanese Patent No. 2885271.
【００１３】この先願特許は薬液注入用の複数の細管を
結束させて地盤の削孔に挿入し、細管と孔壁との間にシ
ール用グラウトを充填し、このシール用グラウトが固化
した上で各細管から薬液を注入するものである。According to this prior patent, a plurality of thin tubes for injecting a chemical solution are bundled and inserted into a ground hole, a sealing grout is filled between the thin tubes and the hole wall, and the sealing grout is solidified. The liquid medicine is injected from each thin tube.
【００１４】これは細管吐出口を軸方向に異ならせるこ
とにより、地盤中の縦方向、横方向への立体的同時注入
を可能にするものであって、工期も短縮され、施工精度
も設計通り仕上げることができるという利点を有するも
のである。This is because three-dimensional simultaneous injection in the vertical and horizontal directions in the ground is made possible by making the narrow pipe discharge ports axially different, the construction period is shortened, and the construction accuracy is as designed. It has the advantage that it can be finished.
【００１５】しかし、この先願特許では、注入液を軸方
向に異なる複数の吐出口から一度に注入して各吐出口に
接触するシールグラウトが破壊される際に、あたかもミ
シンの縫い目を左右に引っ張ると縫い目に沿って一直線
に破れると同様に、シールグラウトが下から上まで連続
して破断してシールの役目をはたすことができなくな
る。このため、一挙に全吐出口からの注入を避け、部分
的に注入しない吐出口をつくり、連続破断を防止してい
る。However, in this prior patent, when the injection grout is injected at one time from a plurality of different outlets in the axial direction and the seal grout in contact with each outlet is destroyed, the seam of the sewing machine is pulled left and right. Similarly, if the seal grout breaks straight along the seam, the seal grout continuously breaks from the bottom to the top and cannot serve as a seal. For this reason, injection from all the ejection ports is avoided at once, and ejection ports that do not partially inject are created to prevent continuous breakage.
【００１６】さらにまた、上述の先願特許では、注入細
管の吐出口まわりがスリーブグラウトで覆われているの
で、図４と同じく、小さな浸透源の問題が生じる。Furthermore, in the above-mentioned prior patent, since the periphery of the injection port of the injection capillary is covered with the sleeve grout, the problem of a small permeation source arises as in FIG.
【００１７】そこで、本発明の目的は地盤状況が各層毎
に異なる地盤に対して、これら各層毎に最適な注入を同
時に達成し得るのみならず、地盤中の縦方向、横方向へ
の立体的な同時注入をも可能であって工期も短縮され、
さらにまた、各ステージの削孔孔壁全体から浸透せしめ
て有効浸透源を大きくして低圧注入を可能にし、このた
め設計通りの薬液注入を全ステージに対して達成し得、
さらに、液状化防止注入のような大容量土に対する長時
間連続注入を可能にし、上述の公知技術に存する欠点を
改良した地盤注入工法を提供することにある。Therefore, the object of the present invention is not only to achieve the optimum injection for each layer at the same time for the ground whose ground condition is different for each layer, but also for three-dimensionally in the vertical and horizontal directions in the ground. It is possible to inject at the same time, shortening the construction period,
Furthermore, by permeating from the entire hole hole wall of each stage to enlarge the effective permeation source and enabling low pressure injection, it is possible to achieve the chemical solution injection as designed for all stages,
Another object of the present invention is to provide a ground pouring method that enables long-term continuous pouring into large-capacity soil, such as liquefaction prevention pouring, and improves the above-mentioned drawbacks of the known art.
【００１８】[0018]
【課題を解決するための手段】上述の目的を達成するた
め、本発明によれば、地盤状況が各層毎に異なる地盤を
改良する地盤注入工法において、複数の細管を、これら
の吐出口が軸方向に間隔を置いて前記各層毎に位置する
ように結束した結束注入管からなる注入管装置を地盤に
削孔された注入孔に挿入し、前記注入管装置と前記注入
孔孔壁との間に形成された空間に前記吐出口から注入液
を吐出し、この空間の孔壁を通して前記注入液を地盤中
に浸透、注入し、前記各吐出口から吐出される注入液は
ゲル化時間の異なる注入液であって、ゲル化時間を任意
に変化させるようにしてなり、これにより、前記各層毎
に最適な注入を同時に達成することを特徴とする。In order to achieve the above-mentioned object, according to the present invention, a ground whose ground condition is different for each layer is provided.
In the ground injection method to be improved, a plurality of thin tubes are injected into the ground by an injection pipe device composed of a bundle injection pipe that is bound so that these discharge ports are axially spaced and located in each of the layers. The injection liquid is discharged from the discharge port into a space formed between the injection pipe device and the injection hole hole wall, and the injection liquid permeates and injects into the ground through the hole wall of this space. However, the injection liquid discharged from each of the discharge ports is
It is an injection solution with different gelation time, and the gelation time is optional.
To each layer, so that each layer
It is characterized in that the optimal injection is achieved at the same time .
【００１９】さらに、上述の目的を達成するため、本発
明によれば、地盤状況が各層毎に異なる地盤を改良する
地盤注入工法において、軸方向に離れて穿設された複数
の外管吐出口を有する外管を地盤に削孔された注入孔に
挿入するとともに、前記外管内に注入管装置を挿入し、
この注入管装置は複数の細管を、これらの吐出口が軸方
向に間隔を置いて前記各層毎に位置するように結束した
結束注入管と、この結束注入管周囲に、軸方向に離れて
配置された複数の袋体とを備え、かつ互いに隣接する袋
体間には少なくとも一個の前記吐出口が位置するように
構成されてなり、これら袋体に流体を充填し、膨脹して
パッカーとし、これにより互いに隣接する一対のパッカ
ーと、外管内壁との間で空間を形成の後、前記吐出口か
ら注入液を前記空間に吐出し、この注入液を外管吐出口
を通じて、外管周囲と注入孔孔壁との間に形成された空
間に導き、この空間の孔壁から地盤中に浸透、注入し、
前記各吐出口から吐出される注入液はゲル化時間の異な
る注入液であって、ゲル化時間を任意に変化させるよう
にしてなり、これにより、前記各層毎に最適な注入を同
時に達成することを特徴とする。Further, in order to achieve the above-mentioned object, according to the present invention, the ground whose ground condition is different for each layer is improved.
In the ground injection construction method, while inserting an outer pipe having a plurality of outer pipe discharge holes that are bored away in the axial direction into the injection hole drilled in the ground, insert an injection pipe device into the outer pipe,
This injection tube device is a bundled injection tube in which a plurality of thin tubes are bundled so that their discharge ports are axially spaced and located in each of the layers, and is arranged around the bundled injection tube in an axially separated manner. And a plurality of bags that are formed, and at least one of the discharge ports is positioned between the adjacent bags, the bag is filled with fluid, inflated into a packer, Thereby, after forming a space between the pair of packers adjacent to each other and the inner wall of the outer tube, the injecting liquid is ejected from the ejection port to the space, and the injecting liquid is passed through the outer tube ejection port and around the outer tube. Injection hole Guide to the space formed between the hole wall, infiltrate and inject into the ground from the hole wall of this space ,
The injection liquids discharged from the respective discharge ports have different gel times.
It is an injectable solution that can be gelled at any time.
As a result, the optimal implantation for each layer is the same.
It is characterized by achieving at times .
【００２０】[0020]
【発明の実施の形態】以下、本発明を具体的に詳述す
る。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
【００２１】一般に、地盤中に注入孔を所定深度まで削
孔し、これに注入管を挿入して注入液を注入する場合、
注入管下部の吐出口から吐出した注入液は注入管と削孔
孔壁の空間を伝わって粗い土層に逸出してしまい、所定
深度に所定の固結体を形成できない。Generally, when an injection hole is drilled to a predetermined depth in the ground and an injection pipe is inserted into the injection hole to inject an injection liquid,
The injection liquid discharged from the discharge port in the lower part of the injection pipe travels through the space between the injection pipe and the wall of the drilled hole and escapes to the coarse soil layer, so that a predetermined solidified body cannot be formed at a predetermined depth.
【００２２】このため、二重管ロッドを用いてまず、瞬
結グラウトを注入して注入管まわりにパッカーを形成の
後、緩結グラウトを注入する方法、あるいは二重管ダブ
ルパッカーを用い、外管まわりにシールグラウトを形成
の後、内管を外管内に挿入し、外管の吐出口からシール
グラウトを破って注入液を所定ステージに注入する方法
等が採用されていた。For this reason, first, by using a double tube rod, a method of injecting a quick setting grout to form a packer around the injection tube and then injecting a slow setting grout, or using a double tube double packer, After forming the seal grout around the pipe, a method of inserting the inner pipe into the outer pipe, breaking the seal grout from the discharge port of the outer pipe, and injecting the injection liquid to a predetermined stage has been adopted.
【００２３】これらの公知方法では、削孔孔壁全体から
注入液が地盤内に浸透することはなく、注入管孔径を有
効径とする球状浸透源から注入液が浸透するという極め
て時間を要するものであった。In these known methods, the injection liquid does not permeate into the ground through the entire hole wall, but it takes a very long time that the injection liquid permeates from the spherical permeation source having the effective diameter of the injection pipe hole. Met.
【００２４】通常、注入工法の対象となる沖積層では、
土層が平面的に積層して滞積している。本発明者等はこ
のような土層の積層状態により透水係数が垂直方向より
水平方向に大きく、かつ、上下の吐出口から吐出される
複数の注入液は流液層が互いの浸透圧によって反発し合
って混合されにくく、このため、注入液は層状に水平方
向に地盤中に浸透することに着目し、本発明を完成する
に至った。Normally, in the alluvium, which is the target of the injection method,
The soil layers are piled up in a plane and accumulated. The inventors of the present invention have such a laminated state of the soil layer that the hydraulic conductivity is larger in the horizontal direction than in the vertical direction, and the plurality of injecting liquids discharged from the upper and lower discharge ports are repelled by the osmotic pressure of the liquid layers. The present invention has been completed, paying attention to the fact that the injection liquids are difficult to mix with each other and therefore the injection liquid permeates horizontally into the ground in a layered manner.
【００２５】すなわち、本発明では、軸方向の異なる吐
出口から適切なゲル化時間を有するグラウトを同時に注
入した場合、孔壁と注入管装置で形成された円筒空間内
で注入液が混合されてしまい、平均化された混合液が地
盤中に注入されるという当初の予想を裏切って、上述の
理由によりそれぞれがほぼ水平方向に浸透し得ることを
見出し、本発明を完成するに至った。That is, according to the present invention, when the grout having an appropriate gelation time is simultaneously injected from the different outlets in the axial direction, the injection liquid is mixed in the cylindrical space formed by the hole wall and the injection tube device. However, in contradiction with the initial expectation that the averaged mixed solution is injected into the ground, it was found that each of them can permeate in a substantially horizontal direction for the above reason, and the present invention has been completed.
【００２６】このため、本発明では、例えば、上部の吐
出口からゲル化時間の短いグラウトを吐出し、下部の吐
出口からゲル化時間の長いグラウトを吐出すれば、ある
いは粗い土層に開口した吐出口からゲル化時間の短いグ
ラウトを吐出し、細い土層に開口した吐出口からゲル化
時間の長いグラウトを吐出すれば、注入管まわりの空間
と、それにつながる水平方向の土層にゲル化時間の短い
注入材による固結層が形成されると同時に、注入管まわ
りのゲル化しないままの空間を通し、それにつながる水
平方向の土層にゲル化時間の長いグラウトの浸透流の層
が形成される。したがって、孔壁からゲル化時間の長い
注入液が地表面に逸出することなく水平方向に浸透する
という現象が生ずる。Therefore, in the present invention, for example, the grout having a short gel time is discharged from the upper discharge port and the grout having a long gel time is discharged from the lower discharge port, or the grout is opened in the coarse soil layer. If the grout with a short gel time is discharged from the discharge port and the grout with a long gel time is discharged from the discharge port opened in a thin soil layer, the space around the injection pipe and the horizontal soil layer connected to it will gel. At the same time as a solidified layer is formed by the injection material with a short time, a grouting seepage layer with a long gelation time is formed in the horizontal soil layer that passes through the ungelled space around the injection pipe. To be done. Therefore, a phenomenon occurs in which the injectate having a long gelation time permeates in the horizontal direction from the hole wall without escaping to the ground surface.
【００２７】そして、ゲル化時間の短いグラウトの吐出
する吐出口を任意の間隔にセットし、その間にゲル化時
間の長いグラウトの吐出する吐出口をセットしておけ
ば、ゲル化時間の短いグラウトとゲル化時間の長いグラ
ウトが円筒状空間から水平方向に浸透し、円柱固結体が
同時に積層された固結体が一気に形成される。If the discharge ports for discharging the grout having a short gelation time are set at arbitrary intervals, and the discharge ports for discharging the grout having a long gelation time are set in the meantime, the grout having a short gelation time can be set. The grout having a long gelation time penetrates horizontally from the cylindrical space, and a solidified body in which columnar solidified bodies are simultaneously laminated is formed at a stretch.
【００２８】本発明に用いられる注入液はゲル化時間の
異なる注入液であって、これらゲル化時間の異なる注入
液をそれぞれ異なる吐出口から地盤中に注入する。好ま
しくは、ゲル化時間の短い方の注入液を、ゲル化時間の
長い方の注入液に先行して地盤中に注入する。The injection solutions used in the present invention are injection solutions having different gelation times, and the injection solutions having different gelation times are injected into the ground through different discharge ports. Preferably, the injection liquid with the shorter gel time is injected into the ground prior to the injection liquid with the longer gel time.
【００２９】[0029]
【発明の実施例】以下、本発明実施例を添付図面を用い
て詳述する。Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
【００３０】図１および図２は本発明にかかる地盤注入
工法の説明図であり、図３の（ａ）、（ｂ）、（ｃ）は
いずれも本発明に用いられる細管の変形例を表した説明
図である。FIGS. 1 and 2 are explanatory views of the ground pouring method according to the present invention. FIGS. 3A, 3B and 3C show modified examples of the thin tube used in the present invention. FIG.
【００３１】図１において、１は本発明に用いる注入管
装置であって、結束注入管２から構成される。In FIG. 1, reference numeral 1 denotes an injection tube device used in the present invention, which is composed of a bundle injection tube 2.
【００３２】結束注入管２は先端にそれぞれ吐出口４、
４・・・４を有する複数本の細管５、５・・・５を、各
吐出口４、４・・・４が互いに軸方向に間隔を置いて位
置するように設ける。なお、結束注入管２は図示しない
が、細管５、５・・・５をひもや、接着剤や、水膨脹ゴ
ム等で互いに結束して構成される。The bundle injection pipe 2 has a discharge port 4 at the tip,
A plurality of thin tubes 5, 5 ... 5 having 4 ... 4 are provided so that the respective discharge ports 4, 4 ... 4 are axially spaced from each other. Although not shown, the binding injection pipe 2 is formed by binding the thin pipes 5, 5 ... 5 to each other with a string, an adhesive, water-expandable rubber or the like.
【００３３】上述の注入管装置１は地盤７中に削孔され
た注入孔８に挿入される。このとき、注入孔８中で、注
入管装置１と孔壁９との間に空間10が形成される。The above-mentioned injection pipe device 1 is inserted into an injection hole 8 drilled in the ground 7. At this time, a space 10 is formed in the injection hole 8 between the injection tube device 1 and the hole wall 9.
【００３４】注入管装置１を注入孔８中に設置し、次い
で、吐出口４から注入液を吐出すると、注入液は空間10
の孔壁９全体を通して地盤７中に円柱状に浸透、注入さ
れ、地盤中７に円柱状の浸透固結体11を形成する。ま
た、複数の吐出口４、４・・・４から注入液を同時に注
入することにより、円柱状の浸透固結体11の積層が同時
に形成される。When the injection pipe device 1 is installed in the injection hole 8 and then the injection liquid is discharged from the discharge port 4, the injection liquid is discharged into the space 10.
It is permeated and injected into the ground 7 through the entire hole wall 9 in the form of a cylinder to form a columnar permeation solidified body 11 in the ground 7. Further, by simultaneously injecting the injecting liquid from the plurality of ejection ports 4, 4, ... 4, A stack of columnar permeation-solidified bodies 11 is simultaneously formed.
【００３５】特に、本発明では、空間10からの円筒状浸
透を複数ステージで同時に行って、円柱状の浸透固結体
11の積層を一気に形成することが可能である。たとえ
ば、注入孔８の削孔径を１０cmとし、ゲル化時間の短い
グラウトの吐出口を細管５の軸方向に２ｍづつ間隔を置
いて配置し、かつ、ゲル化時間の長いグラウトの吐出口
をその中間に配置したとする。この場合、１注入ステー
ジは２ｍとなり、１ステージ当りの円筒状浸透源の大き
さは直径１０cm、長さ２ｍの円柱形状となる。これに対
して、球状の浸透源では、直径10cmの球の表面積とな
る。In particular, in the present invention, the cylindrical infiltration solidified body is obtained by simultaneously performing the cylindrical infiltration from the space 10 in a plurality of stages.
It is possible to form 11 stacked layers at once. For example, the hole diameter of the injection hole 8 is set to 10 cm, the grout discharge ports having a short gelation time are arranged at intervals of 2 m in the axial direction of the thin tube 5, and the grout discharge ports having a long gelation time are arranged at the intervals. Suppose it is placed in the middle. In this case, one injection stage has a length of 2 m, and the size of the cylindrical permeation source per stage is a columnar shape having a diameter of 10 cm and a length of 2 m. In contrast, a spherical permeation source has a surface area of a sphere with a diameter of 10 cm.
【００３６】したがって、液状化防止工事のように、注
入液を長時間にわたり、大量に連続注入する場合、本発
明では低圧で、目づまりすることなく、しかも、大きな
吐出量で、長時間浸透しつづけることが可能なことがわ
かる。Therefore, in the case of continuously injecting a large amount of injection liquid for a long time as in the liquefaction prevention work, according to the present invention, it is possible to penetrate at a low pressure for a long time with a large discharge amount without causing clogging. It turns out that it is possible to continue.
【００３７】上述浸透ステージを引上げながらステージ
毎に行う従来工法では、注入時間がかかるのみならず、
注入液は注入管まわりの間隙から地上部に逸出するのみ
ならず、土かぶりの薄くなる地表面方向に移向しやす
く、所定の層毎への水平な浸透が行われ難くなる。この
ため、あらかじめ瞬結性グラウトを注入してパッカー効
果を有する固結体を形成した後に、ゲル化時間の長いグ
ラウトを注入していた。したがって、注入工程が長くか
かり、不経済であった。In the conventional method in which the permeation stage is pulled up for each stage, not only the injection time is required,
The injection liquid not only escapes from the gap around the injection pipe to the above-ground portion, but also easily moves to the ground surface direction where the soil fogging becomes thin, and it becomes difficult to horizontally infiltrate each predetermined layer. For this reason, after injecting the quick-melting grout in advance to form a solid body having a packer effect, the grout having a long gelation time was injected. Therefore, the injection process is long and uneconomical.
【００３８】ところが、本発明者等は上述本発明のよう
に、上下の複数のステージを同時に、円柱状に浸透すれ
ば、注入液の上層と下層における流れは互いの浸透圧に
よって拘束し合い、このため、上下方向への浸透が妨げ
られて水平方向に円筒状に浸透することを見い出した。
このため、ゲル化時間の短いグラウトと、ゲル化時間の
長いグラウトを上下から同時に注入しても、注入管まわ
りの空間で殆ど混じり合うことなく、周辺に浸透し、ゲ
ル化時間の短いグラウトを主体とする浸透固結層Ｉおよ
びゲル化時間の長いグラウトを主体とする浸透固結層Ｉ
Ｉが形成され、ゲル化時間の長いグラウトは地表面に逸
脱することなく浸透し、確実な円柱状の浸透固結体11の
積層が形成される。注入液は各ステージの土層の状況に
応じたゲル化時間、注入速度、注入量を選択して注入す
る。However, as in the above-described present invention, the present inventors permeate the upper and lower stages at the same time in a cylindrical shape, and the flows in the upper layer and the lower layer of the injecting liquid are restrained by the osmotic pressure of each other. Therefore, it was found that the penetration in the vertical direction was hindered and the penetration in the horizontal direction was cylindrical.
Therefore, even if a grout with a short gel time and a grout with a long gel time are simultaneously injected from above and below, the grout permeates into the surroundings with almost no mixing in the space around the injection tube, and a grout with a short gel time is obtained. Permeation consolidated layer I mainly composed and permeation consolidated layer I mainly composed of grout having long gelation time
I is formed, and the grout having a long gelation time penetrates into the ground surface without deviating from the ground surface, and a reliable columnar solidified solidified body 11 is formed. The injection liquid is injected by selecting the gelation time, the injection speed and the injection amount according to the condition of the soil layer at each stage.
【００３９】なお、本発明に用いられる細管５の吐出口
４は任意であるが、図１に示されるように、先端部に注
入圧力によって開口するゴム状袋をつけて構成され、あ
るいは後述する図２に示されるように、ゴムスリーブ18
で覆って構成される等、逆止弁の効果のある任意の構造
とすることができる。Although the discharge port 4 of the thin tube 5 used in the present invention is optional, as shown in FIG. 1, it is constituted by attaching a rubber-like bag which is opened by the injection pressure to the tip portion, or will be described later. As shown in FIG. 2, the rubber sleeve 18
The structure may be any structure that has the effect of a check valve, such as a structure covered with.
【００４０】さらに、図３（ａ）に示されるように本発
明の細管５は２本の細管をまとめて１本とし、先端部の
吐出口４でＡ液、Ｂ液を合流、注入するようにしてもよ
く、また、図３（ｂ）に示されるように、２本の細管
５、５を地上部で、あるいは地中で１本の細管５にまと
め、Ａ液、Ｂ液の合流液を注入するようにしてもよく、
さらに、図３（ｃ）に示されるように、１本の細管５の
先端付近に複数の吐出口４、４・・・４を設けてもよ
い。Further, as shown in FIG. 3 (a), the thin tube 5 of the present invention is made by combining two thin tubes into one, and the liquids A and B are merged and injected at the discharge port 4 at the tip. Alternatively, as shown in FIG. 3 (b), the two thin tubes 5 and 5 may be combined into one thin tube 5 at the above-ground portion or in the ground to combine the liquids A and B. May be injected,
Further, as shown in FIG. 3C, a plurality of discharge ports 4, 4 ... 4 may be provided near the tip of one thin tube 5.
【００４１】また、本発明にかかる結束注入管２は注入
孔８への挿入を容易にするために、図示しない棒状体を
細管５、５・・・５中に抱き合せて剛性を付与させるこ
ともできる。さらに、本発明の細管５はナイロン、ポリ
塩化ビニル、ポリエステル等を素材とした合成樹脂製あ
るいは金属製等、種々の材料で形成される。Further, in the bundled injection tube 2 according to the present invention, in order to facilitate the insertion into the injection hole 8, a rod-shaped body (not shown) is bound in the thin tubes 5, 5 ... 5 to give rigidity. You can also Further, the thin tube 5 of the present invention is made of various materials such as synthetic resin or metal made of nylon, polyvinyl chloride, polyester or the like.
【００４２】さらにまた、本発明では、粗い層が存在す
る場合には、ＡＢ合流液による比較的ゲル化時間の短い
グラウトを粗い層に浸透させて後、ひき続いて、ゲル化
時間の長いグラウトに切り換えて注入することにより、
所定領域を一定の大きさに浸透固結することができる。
もちろん、必要に応じて再注入することもできる。Furthermore, in the present invention, when a coarse layer is present, after the grout having a relatively short gelation time by the AB confluent is allowed to penetrate into the coarse layer, the grout having a long gelation time is continued. By switching to and injecting,
It is possible to permeate and consolidate a predetermined area to a certain size.
Of course, reinjection can be performed if necessary.
【００４３】さらに、図２を用いて本発明にかかる他の
注入管装置を用いた地盤注入工法を詳述する。Further, the ground injection method using another injection pipe device according to the present invention will be described in detail with reference to FIG.
【００４４】図２に示されるように、本発明にかかる他
の注入管装置１Ｂは図１と同様の結束注入管２と、この
結束注入管周囲に、軸方向に離れて配置された袋体（パ
ッカー）３とを備えて構成される。As shown in FIG. 2, another injection tube device 1B according to the present invention is a bundling injection tube 2 similar to that shown in FIG. 1, and a bag body disposed around this bundling injection tube in an axially separated manner. (Packer) 3.
【００４５】これとは別に、図２に示されるように、外
壁周囲13に、軸方向に離れて複数の吐出口14が配置され
た外管12を地盤７中に削孔された注入孔８に挿入する。Separately from this, as shown in FIG. 2, an outer pipe 12 having a plurality of discharge ports 14 axially separated from each other around the outer wall 13 is bored in the ground 7 for injection. To insert.
【００４６】次いで、図２に示されるように、外管12内
に注入管装置１Ｂを挿入して注入管装置１Ａを形成す
る。。注入管装置１Ｂは吐出口４、４・・・４を有する
複数本の独立した細管５、５・・・５を、各吐出口４、
４・・・４が互いに軸方向に間隔を置いて位置するよう
に接着剤等で密着し、その上にバンド６、６・・・６で
締め付けて結束した結束注入管２と、この結束注入管２
の周囲に、軸方向に離れて配置された複数個の第１の袋
体（パッカー）３とを備え、互いに隣接する第１の袋体
３間には、少なくとも一個の吐出口４が位置するように
構成される。さらに、袋体３には空気や、液体や、窒素
等の不活性気体等からなる流体を細管５を通じて充填
し、膨脹してパッカー３を形成する。ここで、袋体３は
ゴム製のチューブ等であって、その内部に流体を圧入し
てふくらむものである。Then, as shown in FIG. 2, the injection tube device 1B is inserted into the outer tube 12 to form the injection tube device 1A. . The injection pipe device 1B includes a plurality of independent thin tubes 5, 5 ... 5 having discharge ports 4, 4, ...
4 ... 4 are tightly bonded to each other with an adhesive or the like so that they are axially spaced from each other, and the band 6, 6, ... Tube 2
Is provided with a plurality of first bags (packers) 3 arranged apart from each other in the axial direction, and at least one discharge port 4 is located between the first bags 3 adjacent to each other. Is configured as follows. Further, the bag 3 is filled with air, a liquid, or a fluid made of an inert gas such as nitrogen through the thin tube 5, and is expanded to form the packer 3. Here, the bag body 3 is a rubber tube or the like, into which a fluid is press-fitted and bulges.
【００４７】この結果、互いに隣接する一対のパッカー
３、３と、外管12の内壁との間で独立した空間10を形成
する。次いで、吐出口４から注入液を吐出し、この注入
液を空間10から空間16を通して孔壁９の全体から地盤７
中に円柱状に浸透して注入し、地盤７中に円柱状の浸透
固結体11を形成する。また、注入液を吐出口４、４・・
・４から同時に注入することにより、円柱状の浸透固結
体11の積層が同時に形成される。As a result, an independent space 10 is formed between the pair of packers 3 and 3 adjacent to each other and the inner wall of the outer tube 12. Next, the injection liquid is discharged from the discharge port 4, and the injection liquid is passed from the space 10 to the space 16 from the entire hole wall 9 to the ground 7.
It is permeated in a cylindrical shape into the inside and injected to form a permeated solidified body 11 in the cylindrical shape in the ground 7. In addition, the injection liquid is discharged from the discharge ports 4,
By injecting from 4 simultaneously, a stack of cylindrical permeation consolidated bodies 11 is simultaneously formed.
【００４８】[0048]
【発明の効果】上述の本発明は以下の効果を奏する。The present invention described above has the following effects.
【００４９】（１）吐出口が互いに軸方向に間隔を置い
て位置するように細管を複数本結束するので、地盤状況
が各層毎に異なる地盤に対して、これら各層毎に最適な
注入を同時に達成し得る。しかも、地盤中の縦方向、横
方向への立体的な同時注入も可能である。このため、注
入工事も短縮される。(1) Since a plurality of thin tubes are bundled so that the discharge ports are spaced from each other in the axial direction, optimal injection is simultaneously performed for each layer on the ground where the soil condition is different for each layer. Can be achieved. Moreover, it is possible to inject three-dimensionally simultaneously vertically and horizontally in the ground. Therefore, the injection work can be shortened.
【００５０】（２）円筒状浸透源から土粒子間浸透して
得られた円柱状の浸透固結体の積層を一気に形成するこ
とができる。(2) It is possible to form a stack of columnar infiltration solids obtained by infiltrating soil particles from a cylindrical infiltration source at a stretch.
【００５１】（３）注入液は空間を通して孔壁全体から
地盤中に浸透注入され、このため、一つの吐出口からの
浸透源が大きく、低圧注入が可能である。したがって、
液状化防止工事のように大量の注入液を大きな吐出量で
長時間連続注入することにより、大容量土の急速地盤改
良が可能である。(3) The injection liquid is permeated and injected into the ground from the entire hole wall through the space, so that the permeation source from one discharge port is large and low-pressure injection is possible. Therefore,
By continuously injecting a large amount of injection liquid with a large discharge amount for a long time as in the case of liquefaction prevention work, rapid soil improvement of large-capacity soil is possible.
【図１】本発明に用いられる注入管装置の一具体例の断
面図およびこれを用いた地盤注入工法の説明図である。FIG. 1 is a cross-sectional view of a specific example of an injection pipe device used in the present invention and an explanatory view of a ground injection method using the same.
【図２】本発明に用いられる他の注入管装置の断面図お
よびこれを用いた他の地盤注入工法の説明図である。FIG. 2 is a cross-sectional view of another injection pipe device used in the present invention and an explanatory view of another ground injection method using the same.
【図３】（ａ）、（ｂ）、（ｃ）はいずれも本発明にか
かる細管の変形例を表した説明図である。3 (a), (b) and (c) are explanatory views showing modifications of the thin tube according to the present invention.
【図４】従来の注入工法の説明図である。FIG. 4 is an explanatory diagram of a conventional injection method.
【図５】従来の注入工法の説明図である。FIG. 5 is an explanatory diagram of a conventional injection method.
【図６】従来の注入工法の説明図である。FIG. 6 is an explanatory diagram of a conventional injection method.
１ 注入管装置 １Ａ 注入管装置 １Ｂ 注入管装置 ２ 結束注入管 ３ パッカー ４ 吐出口 ５ 細管 ７ 地盤 ８ 注入孔 ９ 孔壁 10 空間 11 円柱状の浸透固結体 12 外管 13 外壁周囲 16 孔壁と外管で形成された空間 Ｉ ゲル化時間の短いグラウトの浸透固結層 ＩＩ ゲル化時間の長いグラウトの浸透固結層 1 Injection tube device 1A injection tube device 1B injection tube device 2 united injection tube 3 packers 4 outlets 5 thin tubes 7 ground 8 injection holes 9 hole wall 10 spaces 11 Cylindrical penetrating solid 12 outer tube 13 Around the outer wall 16 Space formed by hole wall and outer tube I Permeation solidified layer of grout with short gelation time II Permeation solidified layer of grout with long gelation time
フロントページの続き (56)参考文献 特開 平６−167185（ＪＰ，Ａ) 特開 平８−226119（ＪＰ，Ａ) 特開 平６−33683（ＪＰ，Ａ) 特開 平11−81296（ＪＰ，Ａ) 特開 平７−300849（ＪＰ，Ａ)Continued front page (56) References JP-A-6-167185 (JP, A) JP-A-8-226119 (JP, A) JP-A-6-33683 (JP, A) JP-A-11-81296 (JP, A) Japanese Unexamined Patent Publication No. 7-300849 (JP, A)
Claims (2)
毎に異なる地盤を改良する地盤注入工法において、複数
の細管を、これらの吐出口が軸方向に間隔を置いて前記
各層毎に位置するように結束した結束注入管からなる注
入管装置を地盤に削孔された注入孔に挿入し、前記注入
管装置と前記注入孔孔壁との間に形成された空間に前記
吐出口から注入液を吐出して空間の孔壁全体を通して地
盤中に円柱状に浸透、注入し、前記各吐出口から吐出さ
れる注入液はゲル化時間の異なる注入液であって、ゲル
化時間を任意に変化させるようにしてなり、これによ
り、前記各層毎に最適な注入を同時に達成し、円柱状の
浸透固結体の積層を形成することを特徴とする地盤状況
が各層毎に異なる地盤、特に沖積層地盤を改良する地盤
注入工法。1. In a ground pouring method for improving a ground in which soil layers are laminated in a plane and the ground condition is different for each layer, a plurality of thin pipes are provided for each of the layers with their discharge openings being axially spaced. The injection pipe device composed of a bundled injection pipe that is bound so as to be located at a position is inserted into the injection hole drilled in the ground, and the discharge port is provided in the space formed between the injection pipe device and the injection hole wall. by discharging the injection solution from the ground throughout the pore walls of space
Injecting into the disk in a cylindrical shape and injecting, the injecting liquid ejected from each of the ejection ports is an injecting liquid having a different gelling time, and the gelling time is arbitrarily changed. At the same time achieve optimum injection for each layer, columnar
A ground pouring method for improving the ground where the ground condition is different for each layer, especially the alluvium ground, which is characterized by forming a stack of infiltration solids .
毎に異なる地盤を改良する地盤注入工法において、軸方
向に離れて穿設された複数の外管吐出口を有する外管を
地盤に削孔された注入孔に挿入するとともに、前記外管
内に注入管装置を挿入し、この注入管装置は複数の細管
を、これらの吐出口が軸方向に間隔を置いて前記各層毎
に位置するように結束した結束注入管と、この結束注入
管周囲に、軸方向に離れて配置された複数の袋体とを備
え、かつ互いに隣接する袋体間には少なくとも一個の前
記吐出口が位置するように構成されてなり、これら袋体
に流体を充填し、膨脹してパッカーとし、これにより互
いに隣接する一対のパッカーと、外管内壁との間で空間
を形成の後、前記吐出口から注入液を前記空間に吐出
し、この注入液を外管吐出口を通じて、外管周囲と注入
孔孔壁との間に形成された空間に導き、この空間の孔壁
から全体を通して地盤中に円柱状に地盤中に浸透、注入
し、前記各吐出口から吐出される注入液はゲル化時間の
異なる注入液であって、ゲル化時間を任意に変化させる
ようにしてなり、これにより、前記各層毎に最適な注入
を同時に達成し、円柱状の浸透固結体の積層を形成する
ことを特徴とする地盤状況が各層毎に異なる地盤、特に
沖積層地盤を改良する。地盤注入工法。2. In a ground pouring method for improving a ground in which soil layers are laminated in a plane and the ground condition is different for each layer, an outer pipe having a plurality of outer pipe discharge holes bored axially apart from each other is provided. While inserting into the injection hole drilled in the ground, insert the injection pipe device into the outer pipe, this injection pipe device is a plurality of thin tubes, these discharge ports are axially spaced for each of the layers A bundled injection pipe bound so as to be positioned, and a plurality of bag bodies arranged axially apart from each other around the bundled injection pipe, and at least one discharge port is provided between adjacent bag bodies. The bag is filled with fluid and expanded to form a packer, thereby forming a space between a pair of packers adjacent to each other and the inner wall of the outer tube, and then the discharge port. The injection liquid is discharged into the space from the Through the outlet leads into a space formed between the outer tube surrounding the injection hole hole wall, penetrates into the ground in a cylindrical shape in the ground throughout the hole wall of this space, injected, discharged from the respective discharge ports The injectable solution to be injected has different gelation times, and the gelation time is arbitrarily changed. As a result, the optimal injection is simultaneously achieved for each of the layers , and the columnar permeation and consolidation are achieved. To improve the ground, which is characterized by forming a stack of bodies, in which the ground condition is different for each layer, especially the alluvial ground. Ground injection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30480599A JP3500464B2 (en) | 1999-10-27 | 1999-10-27 | Ground injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30480599A JP3500464B2 (en) | 1999-10-27 | 1999-10-27 | Ground injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001123439A JP2001123439A (en) | 2001-05-08 |
| JP3500464B2 true JP3500464B2 (en) | 2004-02-23 |
Family
ID=17937468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30480599A Expired - Fee Related JP3500464B2 (en) | 1999-10-27 | 1999-10-27 | Ground injection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3500464B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4145291B2 (en) * | 2004-12-27 | 2008-09-03 | 強化土エンジニヤリング株式会社 | Ground injection method |
| KR100914962B1 (en) * | 2009-01-22 | 2009-09-10 | 광성지엠(주) | Multi-stage type appratus for injecting reinforcement and method for injecting reinforcement |
| JP2012082676A (en) * | 2011-04-11 | 2012-04-26 | Takenaka Komuten Co Ltd | Displacement controlling method |
| CN104963334B (en) * | 2015-07-13 | 2017-10-13 | 南京林业大学 | Reinforced with slip casting freezing pipe and freeze the construction method that service channel suppresses frozen swell and melt settlement |
| CN109139063B (en) * | 2018-10-17 | 2019-10-29 | 中铁十二局集团有限公司 | Constructing tunnel film bag Grouting Pipe structure and slip casting lithification construction method |
-
1999
- 1999-10-27 JP JP30480599A patent/JP3500464B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001123439A (en) | 2001-05-08 |
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