JP2992399B2 - Chemical solution injection method and equipment used for it - Google Patents
Chemical solution injection method and equipment used for itInfo
- Publication number
- JP2992399B2 JP2992399B2 JP4087456A JP8745692A JP2992399B2 JP 2992399 B2 JP2992399 B2 JP 2992399B2 JP 4087456 A JP4087456 A JP 4087456A JP 8745692 A JP8745692 A JP 8745692A JP 2992399 B2 JP2992399 B2 JP 2992399B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- chemical
- injection
- plate valve
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、地盤改良を目的とする
薬液注入工法およびそれに用いる装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical liquid injection method for improving the ground and an apparatus used for the method.
【０００２】[0002]
【従来の技術】従来、薬液の地盤注入方法としては、
ａ) 薬液を注入管の先端口から注入管の軸線方向に吐出
させる方式と、ｂ) 薬液を注入管の側面に設けられた吐
出口から注入管の軸線に対して横方向に放射状に吐出さ
せる方式とがある。2. Description of the Related Art Conventionally, as a method for injecting a chemical solution into the ground,
a) a method in which a chemical solution is discharged in the axial direction of the injection tube from the tip end of the injection tube; and b) a chemical solution is radially discharged in a direction transverse to the axis of the injection tube from a discharge port provided in a side surface of the injection tube. There is a method.
【０００３】[0003]
【発明が解決しようとする課題】方式ａ) は削孔水と薬
液の吐出口を兼ねさせることができるが、薬液がまとま
って同一方向に吐出されるので注入範囲が狭く地盤内に
改良斑を生じ易い。一方、方式ｂ) の場合に薬液を多方
向に吐出させるには、吐出口を注入管側面の円周方向に
多数設けることを要する。しかしながら、吐出させる薬
液はいずれにしても硬化性を有し、特に瞬結性薬液の場
合にはその硬化時間は１０秒以下である。そして、薬液
を注入する際に通常は毎分１０リットル以下の低吐出量
で無理のない注入を行うので、吐出口における薬液の流
速が小さく、注入作業が長時間続いたときには生成した
薬液のゲル化物によって次第に吐出口が閉塞される。吐
出口を多数設けた場合には、個々の吐出口を通過する薬
液の流速がより小さくなるので、吐出口の閉塞現象が起
こり易くなり、吐出口を多数設けても結局数個の吐出口
しか有効に機能していないことが多い。このようなこと
から、吐出口の数を少なくして６〜３個とし、60°〜 1
20°の間隔で、薬液を部分的な放射状に吐出せざるを得
ない。更に、注入管の側面に設けられた吐出口は、地盤
の削孔時に摩耗し易く、また土砂の流入によって閉塞す
ることもある。In the method a), the hole for drilling water and the discharge port for the chemical solution can be used simultaneously, but since the chemical solution is collectively discharged in the same direction, the injection range is narrow, and an improved spot is formed in the ground. Easy to occur. On the other hand, in the case of method b), in order to discharge the chemical solution in multiple directions, it is necessary to provide a large number of discharge ports in the circumferential direction on the side surface of the injection pipe. However, the chemical to be ejected has curability in any case, and particularly in the case of a flash-setting chemical, the curing time is 10 seconds or less. And, when injecting a chemical solution, a low flow rate of 10 liters per minute or less is normally performed, and the flow rate of the chemical solution at the discharge port is small. The discharge port is gradually closed by the compound. When a large number of discharge ports are provided, the flow rate of the chemical solution passing through the individual discharge ports becomes smaller, so that the clogging phenomenon of the discharge ports is likely to occur. Often not working effectively. For this reason, the number of discharge ports is reduced to 6 to 3, and 60 ° to 1
At 20 ° intervals, the chemical solution must be partially radially discharged. Furthermore, the discharge port provided on the side surface of the injection pipe is liable to be worn when drilling the ground, and may be blocked by the inflow of earth and sand.
【０００４】また、注入管の先端部分には削孔水と薬液
の流路変換装置や先端口の逆止弁装置などを設けるた
め、薬液吐出口の位置は最先端部に設けられたクラウン
ビットから数10cmほど基端側寄りとなる。そのため、地
盤内の改良しようとする領域の下端に薬液吐出口を位置
させるには、図４に示すように、不経済な余掘りを行わ
ざるを得ないという問題点があった。In addition, since a flow path conversion device for drilling water and a chemical solution and a check valve device at the tip end are provided at the tip of the injection pipe, the position of the chemical solution discharge port is a crown bit provided at the foremost end. A few tens of centimeters from the base end. Therefore, in order to locate the chemical solution discharge port at the lower end of the area to be improved in the ground, there is a problem that uneconomical excavation must be performed as shown in FIG.
【０００５】図４は、薬液注入管における薬液吐出口OL
の位置と、地盤を削孔する際の余掘りの要否との関係を
示す説明図である。図４(a) および(b) は、注入管側面
に薬液吐出口を設けた従来の注入管を用いた場合には、
地盤の余掘りが必要となることを示す。図４(a) は、薬
液吐出口OLの位置よりも先端側寄りの地盤- 領域Ｚx に
は薬液が注入されず、改良されない部分が残ることを示
す。そして、図４(b) は、改良予定地盤の先端領域に薬
液吐出口OLが位置するよう地盤- 領域Ｚy の余掘りが必
要であることを示す。図４(c) は、本発明の注入管先端
構造を有する薬液注入管を用いることによって、地盤の
余掘りを必要とせず、改良予定地盤の先端領域に薬液を
注入することができる状態を示す説明図である。図４
(d) は、従来の注入管において薬液吐出口が４個である
ときの薬液の吐出状態をモデル的に示す説明図である。
これに対して、図４(e) は、本発明の注入管先端構造を
有する薬液注入管を用いたときに、薬液が全方向に円盤
状ないし膜状に吐出される状態を示す説明図である。FIG. 4 shows a chemical solution discharge port OL in a chemical solution injection pipe.
FIG. 4 is an explanatory diagram showing a relationship between the position and the necessity of extra digging when drilling a ground. FIGS. 4 (a) and 4 (b) show that when a conventional injection pipe having a chemical solution outlet on the side of the injection pipe is used,
Indicates that the ground must be dug. 4 (a) is ground on the distal end side closer than the position of the chemical liquid discharging ports OL - the area Z x is not injected drug solution, indicating that no improvement portions remain. Then, FIG. 4 (b), ground to position the solution discharge port OL at the tip region of the improvement plan Soil - indicating that it is necessary to outbreak area Z y. FIG. 4 (c) shows a state in which a chemical solution can be injected into the tip region of the ground to be improved by using the chemical solution injection pipe having the injection pipe tip structure of the present invention, without the need for excavation of the ground. FIG. FIG.
(d) is an explanatory view modelly showing a state of discharge of a chemical solution when there are four chemical liquid discharge ports in a conventional injection pipe.
On the other hand, FIG. 4 (e) is an explanatory view showing a state in which a chemical solution is discharged in a disc shape or a film shape in all directions when a chemical solution injection tube having an injection tube tip structure of the present invention is used. is there.
【０００６】本発明の目的は、前記従来の方法における
問題点を改善し、また大深度地下開発における注入技術
として、特に高水圧下での施工や水平施工に対応出来る
工法として、全周方向に薬液を吐出させ、しかも吐出口
の目詰りのない、また余掘りを必要としない薬液注入工
法およびそれに用いる装置を提供することにある。It is an object of the present invention to improve the problems of the conventional method and to provide a technique for injecting into deep underground development, particularly a construction method capable of coping with construction under high water pressure or horizontal construction. An object of the present invention is to provide a chemical liquid injection method which discharges a chemical liquid, does not cause clogging of a discharge port, and does not require extra digging, and an apparatus used therefor.
【０００７】[0007]
【課題を解決するための手段】前記の課題は、少くとも
二重管からなり、外管最先端部にクラウンビットを付設
して削孔機能を有する薬液注入管を用いて地盤内に薬液
を注入し、硬化体を形成させる薬液注入工法において、
縁辺部が薬液注入管の外管内面に当接しながら摺動可能
な板弁が、該薬液注入管の内管または内管繰り出し部の
先端口に間隙を介して付設され、薬液注入時には前記板
弁を付設した内管または内管繰り出し部を、前記板弁が
前記クラウンビットよりも先に臨む位置に内管を前進さ
せ、内管または内管繰り出し部の先端口と前記板弁との
間隙から前記板弁を案内部として薬液注入管の軸線に対
して横方向に、かつ、全周方向に薬液を吐出させる注入
管先端構造を有する薬液注入管を用い、該薬液注入管を
後退させながら薬液を注入して硬化させることによっ
て、解決することができる。The object of the present invention is to provide a chemical liquid injection pipe having at least a double pipe, a drill bit function provided with a crown bit at the foremost part of the outer pipe, and a chemical liquid injection pipe having a drilling function. In the chemical solution injection method of injecting and forming a cured body,
A plate valve that is slidable while the peripheral portion abuts against the inner surface of the outer tube of the liquid injection tube is attached to the inner tube of the liquid injection tube or the distal end of the inner tube feeding portion with a gap therebetween. The inner pipe or the inner pipe payout portion provided with the valve is advanced to the position where the plate valve faces ahead of the crown bit, and the gap between the tip end of the inner pipe or the inner pipe payout portion and the plate valve. Using a chemical injection tube having an injection tube tip structure for discharging the chemical in the lateral direction with respect to the axis of the chemical injection tube using the plate valve as a guide portion, and discharging the chemical in the entire circumferential direction, while retracting the chemical injection tube This can be solved by injecting a chemical solution and curing it.
【０００８】本発明における第１の発明は、「少なくと
も二重管からなり、外管最先端部にクラウンビットを付
設して削孔機能を有する薬液注入管を用いて地盤内に薬
液を注入し、硬化体を形成させる薬液注入工法におい
て、縁辺部が薬液注入管の外管内面に当接しながら摺動
可能な板弁が、該薬液注入管の内管または内管繰り出し
部の先端口に間隙を介して付設され、薬液注入時には前
記板弁を付設した内管または内管繰り出し部を、前記板
弁が前記クラウンビットよりも先に臨む位置に前進さ
せ、内管または内管繰り出し部の先端口と前記板弁とで
形成された間隙から前記板弁を案内部として薬液注入管
の軸線に対して横方向に、かつ、全周方向に薬液を吐出
させる注入管先端構造を有する薬液注入管を用い、該薬
液注入管を後退させながら薬液を注入して硬化させるこ
とを特徴とする薬液注入工法」を要旨とする。[0008] The first invention of the present invention relates to a method of injecting a chemical solution into the ground using a chemical solution injection pipe having at least a double pipe, having a crown bit attached to the outermost end of the outer pipe and having a drilling function. In the chemical solution injection method for forming a cured body, a plate valve slidable while the edge portion abuts against the inner surface of the outer tube of the chemical solution injection tube is provided with a gap at the tip end of the inner tube of the chemical solution injection tube or the inner tube feeding portion. At the time of injecting the chemical, the inner pipe or the inner pipe feeding section provided with the plate valve is advanced to a position where the plate valve faces earlier than the crown bit, and the inner pipe or the inner pipe feeding section is advanced. A chemical injection tube having an injection tube tip structure for discharging the chemical in a direction transverse to the axis of the chemical injection tube and in the entire circumferential direction by using the plate valve as a guide portion from a gap formed by the end port and the plate valve. And do not retract the liquid injection tube. And gist chemical grouting method ", wherein the curing by injecting Luo chemical.
【０００９】また第２の発明は「地盤内に薬液を注入
し、硬化体を形成させる薬液注入工法に用いられる、少
なくとも二重管からなり、外管最先端部にクラウンビッ
トを付設して削孔機能を有する薬液注入管において、縁
辺部が薬液注入管の外管内面に当接しながら摺動可能な
板弁を、該薬液注入管の内管または内管繰り出し部の先
端口に間隙を介して付設し、薬液注入時には前記板弁を
付設した内管または内管繰り出し部を、前記板弁が前記
クラウンビットよりも先に臨む位置に前進させ、内管ま
たは内管繰り出し部の先端口と前記板弁との間隙から前
記板弁を案内部として薬液注入管の軸線に対して横方向
に、かつ、全周方向に薬液を吐出させる注入管先端構造
を有することを特徴とする薬液注入管」を要旨とする。[0009] The second aspect of the present invention relates to a method of injecting a chemical solution into the ground to form a hardened body, which is formed by at least a double pipe, and is provided with a crown bit at the foremost part of the outer pipe. In a drug solution injection tube having a hole function, a plate valve slidable while an edge portion abuts on the inner surface of the outer tube of the drug solution injection tube is provided with a gap between a distal end opening of the inner tube of the drug solution injection tube or an inner tube feeding portion through a gap. At the time of injecting a drug solution, the inner valve or the inner pipe feeding portion provided with the plate valve is advanced to a position where the plate valve faces ahead of the crown bit, and the tip end of the inner pipe or the inner pipe feeding portion. A chemical liquid injection pipe having a liquid injection pipe tip structure for discharging the chemical liquid in a direction transverse to the axis of the liquid chemical injection pipe from the gap with the plate valve as a guide portion and in the entire circumferential direction; ”.
【００１０】[0010]
【実施例】以下、本発明の詳細について図面を参照しな
がら説明する。図１〜３ならびに図５および図６は、本
発明の注入管先端構造のいくつかの態様を示す説明図で
ある。本発明の注入管先端構造１A または１B は、外管
２と内管３との少なくとも二重の管からなり、外管２の
最先端部にクラウンビット４を有する。内管３または内
管繰り出し部３A の先端口には、弁体の全周の縁辺部が
外管２の内面に当接しながら摺動可能な板弁５を、その
一方の面を内管３または内管繰り出し部３A の先端口に
間隙を介して付設する。薬液を注入する際には、板弁５
がクラウンビット４よりも先に臨む位置に内管３または
内管繰り出し部３A を前進させ、内管３または内管繰り
出し部３A の先端口と板弁５との間隙から板弁５を案内
部として、薬液注入管の軸線に対して横方向に、かつ、
全周方向に薬液Ｇを吐出させる。板弁５は、吐出させる
薬液の案内部として機能すると共に、薬液注入管から吐
出された薬液が注入管内に逆流することを防ぐ機能を有
する逆止弁を兼ねる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 and FIGS. 5 and 6 are explanatory views showing some embodiments of the injection tube tip structure of the present invention. The injection tube tip structure 1A or 1B of the present invention comprises at least a double tube of an outer tube 2 and an inner tube 3, and has a crown bit 4 at the most distal end of the outer tube 2. At the distal end of the inner pipe 3 or the inner pipe feed-out portion 3A, a plate valve 5 slidable while the entire periphery of the valve body is in contact with the inner surface of the outer pipe 2 is provided. Alternatively, it is attached to the tip end of the inner pipe feeding section 3A with a gap. When injecting the chemical, the plate valve 5
Moves the inner pipe 3 or the inner pipe feeding section 3A forward to a position facing the crown bit 4 and guides the plate valve 5 from the gap between the tip end of the inner pipe 3 or the inner pipe feeding section 3A and the plate valve 5. As transverse to the axis of the drug injection tube, and
The chemical solution G is discharged in all circumferential directions. The plate valve 5 functions as a guide for the chemical solution to be discharged, and also functions as a check valve having a function of preventing the chemical solution discharged from the chemical liquid injection pipe from flowing back into the injection pipe.
【００１１】内管または内管繰り出し部の先端口に付設
する板弁の材質は、弾性体または可撓性を有し、本発明
の目的を達することができるもので、合成ゴム・天然ゴ
ム；硬質または軟質の合成プラスチックス；金属；天然
または合成繊維の織物；天然または合成皮革などから適
宜のものを選択することができる。合成ゴム、軟質の合
成プラスチックスなどが好適に用いられる。The material of the plate valve attached to the distal end of the inner tube or the inner tube feeding portion is elastic or flexible and can achieve the object of the present invention, and is made of synthetic rubber or natural rubber; Hard or soft synthetic plastics; metal; natural or synthetic fiber fabrics; natural or synthetic leather; Synthetic rubber, soft synthetic plastics and the like are preferably used.
【００１２】本発明の注入管先端構造を有する薬液注入
管を用いた薬液注入工法の態様を、図面を参照しながら
説明する。図１(a) は、本発明の注入管先端構造１A を
有する二重管型薬液注入管を用いて地盤を削孔する際
に、外管２の内面に当接している板弁５の縁辺から削孔
水Ｗを吐出している状況を示す説明図である。なお、削
孔水の流路は、一つに限定されず、内管または／および
外管流路を用いることができる。An embodiment of a chemical solution injection method using a chemical solution injection tube having an injection tube tip structure according to the present invention will be described with reference to the drawings. FIG. 1 (a) shows the edge of a plate valve 5 in contact with the inner surface of an outer tube 2 when drilling a ground using a double-tube type chemical injection tube having an injection tube tip structure 1A of the present invention. It is explanatory drawing which shows the state which is discharging the drilling water W from. In addition, the flow path of drilling water is not limited to one, and an inner pipe and / or an outer pipe flow path can be used.
【００１３】図１(b) は、薬液を注入する際に注入管先
端構造１A を有する二重管型薬液注入管の内管３を前進
させ、板弁５を付設した内管先端口をクラウンビット４
よりも先に臨ませ、内管３の先端口と板弁５との間隙か
ら板弁５を案内として、薬液注入管の軸線に対して横方
向に、かつ、全周方向に薬液Ｇを噴射している状態を示
す説明図である。FIG. 1 (b) shows a state in which the inner tube 3 of the double-tube type chemical injection tube having the injection tube tip structure 1A is advanced when the chemical is injected, and the inner tube distal end provided with the plate valve 5 is crowned. Bit 4
The chemical liquid G is sprayed in a direction transverse to the axis of the chemical liquid injection pipe and in the entire circumferential direction with the plate valve 5 being guided from a gap between the distal end port of the inner pipe 3 and the plate valve 5. It is an explanatory view showing a state where it is doing.
【００１４】板弁を内管または内管繰り出し部の先端口
に付設する方法は、特に限定されない。図２は、板弁を
内管または内管繰り出し部の先端口に取りつける方法の
一例を示し、図２(a) は、先端部分にネジ部Ｓ1 を設け
た内管３または内管繰り出し部３Ａと、このネジ部Ｓ1
に螺合する取り付け部Ｓ2 と板弁支持部６ａとを有す
る、板弁５を保持するための板弁保持具６との組合せを
示す説明図である。板弁保持具６において、取り付け部
Ｓ2 と板弁支持部６ａとの間- 連結部６ｂは、剛体で一
体的に形成してもよいし、また、スプリングコイルなど
を介して連結することもできる。図２(b) は、板弁５を
板弁保持具６によって保持し、内管３または内管繰り出
し部３A の先端口に取り付けた状態を示す説明図であ
る。板弁５の上面に、剛製の板を組み合わせることもで
きる。The method of attaching the plate valve to the distal end of the inner pipe or the inner pipe pay-out portion is not particularly limited. Figure 2 shows an example of a method of attaching the plate valve at the tip opening of the inner tube or the inner tube feeding portion, FIG. 2 (a), the inner tube provided with a screw portion S 1 to the distal end portion 3 or the inner tube feeding section 3A and this thread S 1
And a mounting portion S 2 and the plate valve supporting portion 6a which is screwed into an explanatory diagram showing a combination of a plate valve holder 6 for holding the plate valve 5. In the plate valve holder 6, between the mounting portion S 2 and the plate valve support portion 6a - connecting portion 6b may be integrally formed with rigid, also it is connected via a spring coil it can. FIG. 2B is an explanatory view showing a state in which the plate valve 5 is held by the plate valve holder 6 and is attached to the distal end of the inner pipe 3 or the inner pipe feeding section 3A. A rigid plate may be combined with the upper surface of the plate valve 5.
【００１５】なお、板弁支持部６ａとしては、図２(a)
に示した円柱体に限らず、角柱体でもよい。また、図２
(b) に示したように、錐体を用いることもできる。図３
は、板弁５を支持する面が傾斜している板弁保持具６を
用いた例であり、図３(b) は、板弁を支持する面の傾斜
度に応じて注入薬液を斜前方に吐出させることができる
ことを示す説明図である。FIG. 2 (a) shows the plate valve support 6a.
The prism is not limited to the column shown in FIG. FIG.
As shown in (b), a cone can also be used. FIG.
Fig. 3 (b) shows an example in which a plate valve holder 6 having an inclined surface for supporting the plate valve 5 is used. FIG. 5 is an explanatory view showing that the ink can be ejected to the nozzle.
【００１６】図３は、外管流路２a を閉止する閉止弁30
と、また、内管３の前記閉止弁30の取り付け位置よりも
基端側寄りの位置に、外管流路２a と内管３の流路とを
連通させる連通孔31を設けた先端構造の一例を示す説明
図である。図３では、外管２の内壁に弁座30Ａを、一
方、内管３の外壁の前記弁座30Ａに対応する位置に弁座
30Ａに嵌合する弁体30Ｂを設けた例を示す。FIG. 3 shows a shut-off valve 30 for closing the outer pipe passage 2a.
Further, a distal end structure in which a communication hole 31 for communicating the outer pipe flow path 2a and the flow path of the inner pipe 3 is provided at a position closer to the base end side of the inner pipe 3 than the mounting position of the shut-off valve 30. It is explanatory drawing which shows an example. In FIG. 3, the valve seat 30A is provided on the inner wall of the outer tube 2, while the valve seat is provided on the outer wall of the inner tube 3 at a position corresponding to the valve seat 30A.
An example in which a valve element 30B fitted to 30A is provided is shown.
【００１７】閉止弁30を設ける位置は、図３(b) に示し
たように、薬液を吐出させる際に内管３を前進させ、内
管先端口に付設した板弁５がクラウンビット４よりも先
に臨む位置において、弁座30Ａと弁体30Ｂとが嵌合する
よう選定する。閉止弁30が閉止し外管流路２a の先端が
閉塞された状態で、薬液Ａと薬液Ｂをそれぞれ外管流路
２a と内管３に供給すると、外管流路２a に供給された
薬液は連通孔31を経て内管３の流路内に流入して内管３
に供給された薬液と混合され、得られた混合薬液 (グラ
ウト) Ｇは、内管の先端口と板弁５との間隙から板弁５
を案内として地盤内に吐出される。閉止弁30は、内管３
から吐出された薬液が外管流路２a 内に逆流することを
防ぐための逆止弁としての機能も併せ持つ弁である。As shown in FIG. 3B, the position where the closing valve 30 is provided is such that the inner pipe 3 is advanced when the chemical solution is discharged, and the plate valve 5 attached to the tip end of the inner pipe is moved from the crown bit 4 by the crown bit 4. Is selected so that the valve seat 30A and the valve body 30B are fitted at the position facing the front. When the liquid A and the liquid B are supplied to the outer pipe 2a and the inner pipe 3, respectively, in a state where the closing valve 30 is closed and the end of the outer pipe 2a is closed, the liquid supplied to the outer pipe 2a is supplied. Flows through the communication hole 31 into the flow path of the inner pipe 3 and
The mixed chemical (grout) G obtained is mixed with the chemical supplied to the plate valve 5 through the gap between the distal end of the inner tube and the plate valve 5.
Is discharged into the ground as a guide. The closing valve 30 is
This is a valve which also has a function as a check valve for preventing the chemical solution discharged from the device from flowing back into the outer pipe flow path 2a.
【００１８】本発明の薬液注入工法において、薬液注入
時に板弁を付設した注入管の内管を前進させるが、図１
または図２に示すような内管全体を移動させる態様の他
に、注入管先端部で差圧弁を利用した内管繰り出し機構
を有する注入管先端構造を用いてもよい。内管繰り出し
機構を有する注入管先端構造の例を図５および図６に示
すが、他に公知の方法を用いることもできる。In the chemical solution injection method according to the present invention, the inner tube of the injection tube provided with the plate valve is advanced when the chemical solution is injected.
Alternatively, in addition to the mode in which the entire inner pipe is moved as shown in FIG. 2, an injection pipe tip structure having an inner pipe feeding mechanism using a differential pressure valve at the tip of the injection pipe may be used. 5 and 6 show examples of the injection tube tip structure having the inner tube feeding mechanism, but other known methods can also be used.
【００１９】図５は、内管繰り出し機構を有する注入管
先端構造１B の一態様を示す説明図である。内管３の先
端部分に、その外側に嵌合する管状の内管繰り出し部３
A が設けられ、この内管繰り出し部３A の先端口に板弁
５が付設される。内管繰り出し部３A の基端側には外管
流路２a 内を移動可能なフランジ部３Bが形成されてい
る。内管繰り出し部３A は、フランジ部３B を含めて、
その内側面は内管３の外側面と摺動可能であり、また、
フランジ部３B の外側面は外管２の内面と摺動可能であ
って、外管流路２a 内を移動可能である。フランジ部３
B の側面には、外管流路２a の上流側の圧力を保持する
ために、内管３の外側面および外管２の内面との圧密を
維持するための適宜の数のＯ- リングなどのシール部材
51が付設されている。FIG. 5 is an explanatory view showing one embodiment of an injection pipe tip structure 1B having an inner pipe feeding mechanism. A tubular inner tube pay-out portion 3 fitted to the tip of the inner tube 3
A is provided, and a plate valve 5 is attached to the distal end of the inner pipe feeding section 3A. A flange 3B is formed on the base end side of the inner pipe feeding section 3A so as to be movable in the outer pipe flow path 2a. The inner pipe feeding section 3A includes the flange section 3B,
Its inner surface is slidable with the outer surface of the inner tube 3, and
The outer surface of the flange portion 3B is slidable with the inner surface of the outer tube 2 and is movable in the outer tube flow path 2a. Flange part 3
On the side of B, an appropriate number of O-rings and the like for maintaining the pressure on the outer surface of the inner tube 3 and the inner surface of the outer tube 2 to maintain the pressure on the upstream side of the outer tube flow path 2a are provided. Seal member
51 is attached.
【００２０】また、薬液を吐出させる際に内管繰り出し
部３A を前進させ、内管繰り出し部３A の先端口に付設
した板弁５がクラウンビット４よりも先に臨む位置にお
いて内管繰り出し部３A を保持するためのストッパー52
が、外管２の先端部分の内壁面に設けられている。ま
た、内管繰り出し部３A を前進させ、フランジ部３B の
先端側端面がストッパー52で保持された状態において、
フランジ部３B を含む内管繰り出し部３A によって覆わ
れていない、内管３の先端寄りの位置に、外管流路２a
と内管３の流路とを連通させる連通孔31が設けられてい
る。Further, when discharging the chemical, the inner pipe feeding section 3A is advanced, and the inner pipe feeding section 3A is located at a position where the plate valve 5 attached to the tip end of the inner pipe feeding section 3A faces ahead of the crown bit 4. Stopper 52 for holding
Are provided on the inner wall surface of the distal end portion of the outer tube 2. Further, in a state where the inner tube payout portion 3A is advanced and the front end surface of the flange portion 3B is held by the stopper 52,
The outer pipe flow path 2a is located at a position near the tip of the inner pipe 3 which is not covered by the inner pipe feeding section 3A including the flange section 3B.
A communication hole 31 is provided for communicating the flow path with the flow path of the inner pipe 3.
【００２１】この態様の先端構造１B を有する薬液注入
管を用いて地盤を削孔する際には、図５(a) に示すよう
に、内管繰り出し部３A が後退している状態で内管３に
削孔水Ｗを供給し、内管繰り出し部３A の先端口と板弁
５との間隙を経て外管２の内面に当接している板弁５の
周辺から削孔水Ｗを吐出させながら削孔する。薬液注入
の際には、外管流路２a に予め加圧水を供給して内管繰
り出し部３Aを前進させる。外管流路２a に加圧水を供
給すると、図５(b) に示すように、内管繰り出し部３A
のフランジ部３B の基端側端面が加圧水の圧力を受けて
内管繰り出し部３A が注入管の先端側に移動し、フラン
ジ部３B の先端側端面がストッパー52に達した位置で保
持される。When drilling the ground using the chemical injection pipe having the tip structure 1B of this embodiment, as shown in FIG. 5 (a), the inner pipe feeding section 3A is retracted and the inner pipe is retracted. Drilling water W is supplied to the nozzle 3, and the drilling water W is discharged from the periphery of the plate valve 5 in contact with the inner surface of the outer pipe 2 through the gap between the distal end port of the inner pipe feeding portion 3 </ b> A and the plate valve 5. While drilling. At the time of injecting a chemical solution, pressurized water is supplied to the outer pipe flow path 2a in advance to advance the inner pipe feeding section 3A. When pressurized water is supplied to the outer pipe flow path 2a, as shown in FIG.
The proximal end surface of the flange portion 3B receives the pressure of the pressurized water, and the inner tube feeding portion 3A moves toward the distal end of the injection pipe, and is held at a position where the distal end surface of the flange portion 3B reaches the stopper 52.
【００２２】この位置において、内管繰り出し部３A の
先端口に付設した板弁５がクラウンビット４よりも先に
臨み、また、内管３に設けられた連通孔31を経て外管流
路２a と内管３の流路とが連通する状態となる。この状
態において、外管流路２a の先端側は内管繰り出し部３
A のフランジ部３B によって閉塞され、薬液Ａと薬液Ｂ
をそれぞれ外管流路２a と内管３に供給すると、外管流
路２a に供給された薬液は連通孔31を経て内管３の流路
内に流入して内管３に供給された薬液と混合される。得
られた混合薬液 (グラウト) Ｇは、内管繰り出し部３Ａ
の先端口と板弁５との間隙から板弁５を案内として地盤
内に吐出される。内管繰り出し部３A のフランジ部３B
は、内管繰り出し部３A から吐出された薬液が外管流路
２a 内に逆流することを防ぐための逆止弁としての機能
も併せ持つ。In this position, the plate valve 5 attached to the distal end of the inner pipe feeding section 3A faces ahead of the crown bit 4, and the outer pipe flow path 2a passes through the communication hole 31 provided in the inner pipe 3. And the flow path of the inner pipe 3 communicate with each other. In this state, the distal end side of the outer pipe flow path 2 a
A is closed by the flange 3B of A,
Is supplied to the outer pipe flow path 2a and the inner pipe 3 respectively, the chemical liquid supplied to the outer pipe flow path 2a flows into the flow path of the inner pipe 3 through the communication hole 31, and the chemical liquid supplied to the inner pipe 3 is supplied. Mixed with. The obtained mixed drug solution (grout) G is supplied to the inner tube feeding section 3A.
Is discharged into the ground by using the plate valve 5 as a guide from the gap between the front end port of the plate valve 5 and the plate valve 5. Flange part 3B of inner pipe pay-out part 3A
Has a function as a check valve for preventing the chemical solution discharged from the inner pipe feeding section 3A from flowing back into the outer pipe flow path 2a.
【００２３】図６は、内管繰り出し機構を有する注入管
先端構造１B の別の態様を示す説明図である。内管３の
先端部分に、その外側に嵌合する管状の内管繰り出し部
３A が設けられ、この先端口に板弁５が付設される。内
管繰り出し部３A の中間部には仕切り３C が設けられ、
内管繰り出し部３Aは、その基端側から仕切り部までの
部分の内側面は内管３の外側面と摺動可能であって、外
管流路２a 内を移動可能である。FIG. 6 is an explanatory view showing another embodiment of the injection tube tip structure 1B having an inner tube feeding mechanism. At the tip of the inner tube 3, there is provided a tubular inner tube feed-out portion 3A fitted to the outside thereof, and a plate valve 5 is attached to the tip opening. A partition 3C is provided at an intermediate portion of the inner pipe feeding section 3A,
The inner surface of the inner tube feeding portion 3A from the base end to the partition portion is slidable with the outer surface of the inner tube 3 and is movable in the outer tube flow path 2a.
【００２４】外管流路２a には、閉止弁61が設けられ
る。薬液を吐出させる際に内管繰り出し部３A を前進さ
せ、内管繰り出し部３A の先端口に付設した板弁５がク
ラウンビット４よりも先に臨む位置において内管繰り出
し部３A を保持するためのストッパー機能を有する閉止
弁61の弁座61Ａが外管２の先端部分の内壁面に設けら
れ、一方、内管繰り出し部３A の外壁の前記弁座61Ａに
対応する位置に弁座61Ａに嵌合する弁体61Ｂが設けられ
ている。A shutoff valve 61 is provided in the outer pipe flow path 2a. When discharging the liquid chemical, the inner pipe feeding section 3A is advanced to hold the inner pipe feeding section 3A at a position where the plate valve 5 attached to the distal end of the inner pipe feeding section 3A faces ahead of the crown bit 4. A valve seat 61A of a closing valve 61 having a stopper function is provided on the inner wall surface at the distal end portion of the outer tube 2, while the valve seat 61A is fitted to a position corresponding to the valve seat 61A on the outer wall of the inner tube feeding portion 3A. A valve body 61B is provided.
【００２５】閉止弁61を設ける位置は、図６(b) に示し
たように、薬液を吐出させる際に内管繰り出し部３A を
前進させ、内管繰り出し部３A の先端口に付設した板弁
５がクラウンビット４よりも先に臨む位置において、弁
座61Ａと弁体61Ｂとが嵌合するよう選定する。閉止弁61
は、注入管から吐出された薬液が注入管内に逆流するこ
とを防ぐための逆止弁としての機能も併せ持つ弁であ
る。As shown in FIG. 6 (b), the position of the closing valve 61 is such that the inner pipe feeding section 3A is advanced when the chemical solution is discharged, and the plate valve provided at the tip end of the inner pipe feeding section 3A. The valve seat 61A and the valve body 61B are selected so as to be fitted in a position where 5 faces ahead of the crown bit 4. Shut-off valve 61
Is a valve which also has a function as a check valve for preventing the chemical solution discharged from the injection pipe from flowing back into the injection pipe.
【００２６】内管繰り出し部３A には、外管流路２a と
内管繰り出し部３A の先端部流路とを連通させる連通孔
62が設けられる。連通孔62を設ける位置は、内管繰り出
し部３A の仕切り３C が設けられている位置よりも先端
側寄りであり、かつ、弁体61Ｂの取り付け位置よりも基
端側寄りであるよう選定する。また、内管繰り出し部３
A には、その仕切り３C が設けられている位置よりも基
端側寄りの位置に、連通孔63が設けられる。更に、連通
孔63には、逆止弁64が設けられる。逆止弁64は、内管３
の流路内の流体を外管流路２a 方向には通すが、外管流
路２a 内の流体が内管３の流路内に流入することを防ぐ
機能を有する弁である。A communication hole for communicating the outer pipe flow path 2a with the flow path at the tip of the inner pipe feed section 3A is provided in the inner pipe feeding section 3A.
62 are provided. The position where the communication hole 62 is provided is selected so as to be closer to the distal end side than the position where the partition 3C of the inner pipe feeding portion 3A is provided and closer to the base end side than the mounting position of the valve body 61B. In addition, the inner pipe feeding section 3
In A, a communication hole 63 is provided at a position closer to the base end side than the position where the partition 3C is provided. Further, a check valve 64 is provided in the communication hole 63. The check valve 64 is connected to the inner pipe 3
Is a valve having a function of passing the fluid in the flow path in the direction of the outer pipe flow path 2a but preventing the fluid in the outer pipe flow path 2a from flowing into the flow path of the inner pipe 3.
【００２７】この注入管先端構造を有する薬液注入管を
用いた薬液注入工法の態様を、図面を参照しながら説明
する。地盤を削孔する際には、図６(a) に示すように、
内管繰り出し部３A が後退している状態で外管流路２a
に削孔水を供給し、外管２の内面に当接している板弁５
の縁辺から削孔水Ｗを吐出させながら削孔する。An embodiment of the chemical solution injection method using the chemical solution injection tube having the injection tube tip structure will be described with reference to the drawings. When drilling the ground, as shown in Fig. 6 (a),
With the inner pipe feeding section 3A retracted, the outer pipe flow path 2a
The plate valve 5 which supplies drilling water to the inner surface of the outer pipe 2
The hole is drilled while discharging the drilling water W from the edge of.
【００２８】薬液注入の際には、内管に予め加圧水を供
給して内管繰り出し部３A を前進させる。内管に加圧水
を供給すると、図６(b) に示すように、内管繰り出し部
３Aの仕切り３C の基端側の面が加圧水の圧力を受けて
内管繰り出し部３A が注入管の先端側に移動し、弁体61
Ｂが弁座61Ａに嵌合した位置で保持される。At the time of injecting a chemical, pressurized water is supplied to the inner tube in advance to advance the inner tube feeder 3A. When the pressurized water is supplied to the inner pipe, as shown in FIG. 6 (b), the base end surface of the partition 3C of the inner pipe feed section 3A receives the pressure of the pressurized water and the inner pipe feed section 3A is moved to the distal end side of the injection pipe. Move to the valve body 61
B is held at a position where it is fitted to the valve seat 61A.
【００２９】この位置において、内管繰り出し部３Ａの
先端口に付設した板弁５がクラウンビット４よりも先に
臨み、また、内管繰り出し部３A に設けられた連通孔63
および逆止弁64を経て内管３および内管繰り出し部３A
の基端側流路と外管流路２aとが連通し、ついで連通孔6
2を経て外管流路２a と内管繰り出し部３A の先端側流
路とが連通する状態となる。In this position, the plate valve 5 attached to the tip end of the inner pipe feeding section 3A faces ahead of the crown bit 4, and the communication hole 63 provided in the inner pipe feeding section 3A.
And the inner pipe 3 and the inner pipe let-out portion 3A through the check valve 64
The base end side flow path and the outer pipe flow path 2a communicate with each other.
Through 2, the outer pipe flow path 2 a communicates with the flow path on the distal end side of the inner pipe pay-out portion 3 A.
【００３０】この状態において、外管流路２a の先端部
は閉止弁61によって閉塞され、薬液Ａと薬液Ｂをそれぞ
れ外管流路２a と内管３に供給すると、内管３に供給さ
れた薬液は連通孔63および逆止弁64を経て外管流路２a
内に流入して外管流路２a に供給された薬液と混合され
る。得られた混合薬液 (グラウト) Ｇは、連通孔62を経
て内管繰り出し部３A の先端側流路内に流入し内管繰り
出し部３AAの先端口と板弁５との間隙から板弁５を案内
として地盤内に吐出される。In this state, the distal end of the outer pipe flow path 2a is closed by the closing valve 61, and when the chemical solution A and the chemical solution B are supplied to the outer pipe flow path 2a and the inner pipe 3, respectively, they are supplied to the inner pipe 3. The chemical solution passes through the communication hole 63 and the check valve 64 and passes through the outer pipe passage 2a.
And is mixed with the chemical supplied to the outer pipe flow path 2a. The obtained mixed chemical (grout) G flows into the front end side flow path of the inner pipe feeding section 3A through the communication hole 62, and the plate valve 5 is removed from the gap between the front end port of the inner pipe feeding section 3AA and the plate valve 5. It is discharged into the ground as guidance.
【００３１】本発明の方法で使用できる薬液としては、
水ガラス系の他に高分子系、セメント系、スラグ系など
がある。The chemicals usable in the method of the present invention include:
In addition to the water glass type, there are a polymer type, a cement type, a slag type and the like.
【００３２】次に、本発明の注入管先端構造を有する薬
液注入管を用いた薬液注入工法によって、具体的に薬液
を注入した例について説明する。図３に示す二重管型薬
液注入管を用いて地盤内に薬液注入を行った。薬液注入
管 (外管：外径40.5mm, 内径31.0mm；内管：外径15mm,
内径10mm) の内管先端口には、板弁としてゴム製円板
(直径37mm, 厚さ２mm) を板弁保持具を用いて取り付け
た。水を用いた吐出実験を予め地上で行ったところ、水
は先端口から板弁を案内として全周方向に円盤状に均一
に吐出した。薬液注入場所は開削予定の地盤で、地表側
から埋土層１ｍ、砂質土層２ｍ、砂礫土層１ｍ、４ｍよ
り下部は砂質土層で構成されていた。薬液注入区間は、
ＧＬ−２ｍから−４ｍの２ｍ区間とし、改良範囲は断面
積ほぼ１ｍ2 （半径 0.6ｍの円柱部分）を予定した。薬
液注入量は、上部砂質土層および砂礫土層にそれぞれ 4
00ｌとした。Next, an example in which a chemical is specifically injected by the chemical injection method using the injection pipe having the injection pipe tip structure of the present invention will be described. The chemical solution was injected into the ground using the double-tube type chemical solution injection pipe shown in FIG. Chemical injection tube (outer tube: outer diameter 40.5mm, inner diameter 31.0mm; inner tube: outer diameter 15mm,
At the tip of the inner tube with an inner diameter of 10 mm), a rubber disc is used as a plate valve.
(Diameter 37 mm, thickness 2 mm) was attached using a plate valve holder. When a discharge experiment using water was conducted in advance on the ground, the water was uniformly discharged in a disk shape in the entire circumferential direction from the front end port with a plate valve as a guide. The chemical injection site was the ground to be excavated, and the lower part of the ground layer 1 m, sandy soil layer 2 m, gravel soil layers 1 m and 4 m was composed of sandy soil layers from the surface side. The chemical solution injection section
From GL-2m and 2m section-4M, improved range was scheduled to cross-sectional area approximately 1 m 2 (cylindrical section of radius 0.6 m). The injection volume of the chemical was 4 times for the upper sandy soil layer and the gravel soil layer, respectively.
00l.
【００３３】先ず、前記注入管を用いてＧＬ−４ｍまで
削孔した後、内管を前進させて板弁をクラウンビットよ
りも先に繰り出し、薬液注入を開始した。注入に使用し
た薬液の配合とゲルタイムは次の通りである。 Ａ液(100リットルあたり); JIS ３号水ガラス 50リットル 水 50リットル Ｂ液(100リットルあたり); a> 瞬結性懸濁型 水酸化カルシウム 20kg (ゲルタイム: 11秒): ポルトランドセメント 40kg 水 残部 b> 瞬結性溶液型 重炭酸カリウム 11kg (ゲルタイム: 10秒): 水 残部 c> 緩結性溶液型 重炭酸ソーダ ６kg (ゲルタイム: ６分): 水 残部First, after the hole was drilled to GL-4m using the injection pipe, the inner pipe was advanced to feed out the plate valve before the crown bit, and the injection of the chemical was started. The formulation and gel time of the drug solution used for injection are as follows. Liquid A (per 100 liters); JIS No. 3 water glass 50 liters Water 50 liters Liquid B (per 100 liters); a> 20 kg of instantaneous suspension type calcium hydroxide (gel time: 11 seconds): Portland cement 40 kg water balance b> Quick-setting solution type potassium bicarbonate 11kg (gel time: 10 seconds): water balance c> Slow-setting solution type sodium bicarbonate 6kg (gel time: 6 minutes): water balance
【００３４】１ステップ長を0.25ｍとして、第１〜第４
ステップでは、各ステップ毎に、先に瞬結性の懸濁型薬
液 (使用したＢ液…a>) 50ｌを注入し、引続いて緩結性
の溶液型薬液 (使用したＢ液…c>) 50ｌを注入した後、
次のステップまでロッドを引上げて薬液注入を繰返し、
計 400ｌの薬液を注入した。第５ステップ〜第８ステッ
プでは、各ステップ毎に、先に瞬結性の溶液型薬液(使
用したＢ液…b>) 30ｌを注入し、引続いて緩結性の溶液
型薬液 (使用したＢ液…c>) 70ｌを注入した後、次のス
テップまでロッドを引き上げて薬液注入を繰返し、計 4
00ｌの薬液を注入した。薬液注入を終了した後、注入個
所周辺の地盤を掘削しながら改良体を観察したところ、
直径 1.2ｍ、高さ 2.0ｍの予定した改良範囲に薬液が均
一に注入されている状態が確認された。本実施例では、
内管内にＢ液を、また、内管と外管との間の流路にＡ液
を、それぞれ供給したが、これに限定されず逆でもよ
い。Assuming that one step length is 0.25 m, first to fourth
In each step, 50 l of a suspending-type drug solution (used B solution ... a>) is first injected for each step, and subsequently, a slow-setting solution-type drug solution (used B solution ... c>) ) After injecting 50 l,
Pull the rod up to the next step and repeat the liquid injection,
A total of 400 l of the drug solution was injected. In each of the fifth to eighth steps, 30 l of a quick-setting solution-type chemical solution (the used B solution... B>) was injected at each step, and subsequently, a slow-setting solution-type chemical solution (used Solution B ... c>) After injecting 70 l, the rod was pulled up to the next step, and the injection of the drug solution was repeated.
00 l of the drug solution was injected. After finishing the injection of the chemical, the improved body was observed while excavating the ground around the injection point.
It was confirmed that the chemical solution was uniformly injected into the planned improvement area of 1.2 m in diameter and 2.0 m in height. In this embodiment,
The liquid B was supplied into the inner tube, and the liquid A was supplied to the flow path between the inner tube and the outer tube. However, the present invention is not limited to this, and may be reversed.
【００３５】[0035]
【発明の効果】本発明の注入管先端構造においては、内
管または内管繰り出し部の管体の先端部端面の全周とこ
れに付設した板弁とで形成される連続的な間隙を薬液の
吐出口とし、従来の注入管の薬液吐出口の如き細孔がな
いので、吐出口は目詰まりを起こさない。薬液注入時
に、注入管を回転させなくても、薬液は全周方向に吐出
され注入管周辺全体の地盤内に注入されるので、地盤内
に改良斑を生じない。板弁と内管管体の先端部端面の全
周とが当接する部分の間隙の大小によって薬液の吐出圧
力や吐出速度を調節することができる。本発明の板弁
は、薬液を吐出させる際の案内部であると共に、逆止弁
の機能をも有し、薬液注入管の内管および外管内への土
砂の流入を防ぐことができる。また、薬液注入管の最先
端部の位置で薬液を吐出させるので、地盤を余掘りする
必要がない。In the tip structure of the injection pipe according to the present invention, a continuous gap formed by the entire circumference of the end face of the tip of the inner pipe or the pipe body of the inner pipe feeding portion and the plate valve attached thereto is formed by the chemical solution. The discharge port does not have clogging because it does not have a fine hole unlike the conventional liquid discharge port of the injection tube. Even when the injection pipe is not rotated at the time of injecting the chemical, the chemical is discharged in the entire circumferential direction and injected into the ground around the entire injection pipe, so that no improved spots are generated in the ground. The discharge pressure and discharge speed of the chemical solution can be adjusted by the size of the gap at the portion where the plate valve and the entire periphery of the end portion of the inner tube end contact. The plate valve of the present invention is a guide portion for discharging a chemical solution, and also has a check valve function, and can prevent inflow of earth and sand into the inner tube and the outer tube of the chemical solution injection tube. In addition, since the chemical solution is discharged at the position of the tip of the chemical solution injection pipe, it is not necessary to dig the ground.
【００３６】[0036]
【図１】図１は、本発明の注入管先端構造の例を示す説
明図である。FIG. 1 is an explanatory view showing an example of an injection tube tip structure according to the present invention.
【図２】図２は、板弁を内管または内管繰り出し部の先
端口に取りつける方法の一例を示す説明図である。FIG. 2 is an explanatory view showing an example of a method of attaching a plate valve to a tip end of an inner pipe or an inner pipe feeding section.
【図３】図３は、外管流路に閉止弁を、また、外管流路
と内管流路とを連通させる連通孔を設けた先端構造の一
例を示す説明図である。FIG. 3 is an explanatory diagram showing an example of a distal end structure in which a closing valve is provided in an outer pipe flow path and a communication hole for communicating the outer pipe flow path and the inner pipe flow path is provided.
【図４】図４は、薬液注入管における薬液吐出口の位置
と、地盤を削孔する際の余掘りの要否との関係を示す説
明図である。FIG. 4 is an explanatory diagram showing the relationship between the position of a chemical solution discharge port in a chemical solution injection pipe and the necessity of extra digging when drilling a ground.
【図５】図５は、内管繰り出し機構を有する注入管先端
構造の一態様を示す説明図である。FIG. 5 is an explanatory diagram showing one embodiment of an injection tube tip structure having an inner tube feeding mechanism.
【図６】図６は、内管繰り出し機構を有する注入管先端
構造の別の態様を示す説明図である。FIG. 6 is an explanatory view showing another embodiment of an injection tube tip structure having an inner tube feeding mechanism.
【００３７】[0037]
１A,１B …注入管先端構造、２…外管、３…内管、４…
クラウンビット、５…板弁、６…板弁保持具、30…閉止
弁、31…連通孔、Ｇ…薬液、Ｗ…削孔水、３A …内管繰
り出し部、61…閉止弁、62,63 …連通孔、64…逆止弁1A, 1B ... injection tube tip structure, 2 ... outer tube, 3 ... inner tube, 4 ...
Crown bit, 5: plate valve, 6: plate valve holder, 30: shut-off valve, 31: communication hole, G: chemical solution, W: drilling water, 3A: inner pipe feeding portion, 61: shut-off valve, 62, 63 ... communication hole, 64 ... check valve
Claims (2)
部にクラウンビットを付設して削孔機能を有する薬液注
入管を用いて地盤内に薬液を注入し、硬化体を形成させ
る薬液注入工法において、縁辺部が薬液注入管の外管内
面に当接しながら摺動可能な板弁が、該薬液注入管の内
管または内管繰り出し部の先端口に間隙を介して付設さ
れ、薬液注入時には前記板弁を付設した内管または内管
繰り出し部を、前記板弁が前記クラウンビットよりも先
に臨む位置に前進させ、内管または内管繰り出し部の先
端口と前記板弁とで形成された間隙から前記板弁を案内
部として薬液注入管の軸線に対して横方向に、かつ、全
周方向に薬液を吐出させる注入管先端構造を有する薬液
注入管を用い、該薬液注入管を後退させながら薬液を注
入して硬化させることを特徴とする薬液注入工法。1. A chemical solution injection method for injecting a chemical solution into the ground by using a chemical solution injection tube having at least a double pipe, having a crown bit attached to the outermost end of the outer tube and having a drilling function, and forming a hardened body. In the construction method, a plate valve that is slidable while the edge portion abuts against the inner surface of the outer tube of the liquid injection tube is provided at the distal end of the inner tube of the liquid injection tube or the feeding portion of the inner tube via a gap, and the liquid injection is performed. Occasionally, the inner pipe or the inner pipe payout portion provided with the plate valve is advanced to a position where the plate valve faces ahead of the crown bit, and the inner end of the inner pipe or the inner pipe payout portion and the plate valve are formed. Using the chemical injection pipe having an injection pipe tip structure for discharging the chemical in the lateral direction with respect to the axis of the chemical injection pipe with the plate valve serving as a guide portion from the gap, and discharging the chemical in the entire circumferential direction, It is necessary to inject and cure the chemical while retracting. And a chemical liquid injection method.
せる薬液注入工法に用いられる、少なくとも二重管から
なり、外管最先端部にクラウンビットを付設して削孔機
能を有する薬液注入管において、縁辺部が薬液注入管の
外管内面に当接しながら摺動可能な板弁を、該薬液注入
管の内管または内管繰り出し部の先端口に間隙を介して
付設し、薬液注入時には前記板弁を付設した内管または
内管繰り出し部を、前記板弁が前記クラウンビットより
も先に臨む位置に前進させ、内管または内管繰り出し部
の先端口と前記板弁との間隙から前記板弁を案内部とし
て薬液注入管の軸線に対して横方向に、かつ、全周方向
に薬液を吐出させる注入管先端構造を有することを特徴
とする薬液注入管。2. A chemical solution having at least a double pipe and having a crown bit attached to a foremost part of an outer pipe, which is used in a chemical solution injection method for injecting a chemical solution into the ground to form a cured body. In the injection pipe, a plate valve that is slidable while the edge portion abuts against the inner surface of the outer pipe of the chemical injection pipe is attached to the inner pipe of the chemical injection pipe or the distal end of the inner pipe feeding section via a gap, and At the time of injection, the inner pipe or the inner pipe feeding portion provided with the plate valve is advanced to a position where the plate valve faces earlier than the crown bit, and the front end of the inner pipe or the inner pipe feeding portion and the plate valve are connected. A chemical liquid injection pipe having an injection pipe tip structure for discharging a chemical liquid in a direction transverse to an axis of the liquid chemical injection pipe and in an entire circumferential direction by using the plate valve as a guide portion from a gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4087456A JP2992399B2 (en) | 1992-03-12 | 1992-03-12 | Chemical solution injection method and equipment used for it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4087456A JP2992399B2 (en) | 1992-03-12 | 1992-03-12 | Chemical solution injection method and equipment used for it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05255926A JPH05255926A (en) | 1993-10-05 |
| JP2992399B2 true JP2992399B2 (en) | 1999-12-20 |
Family
ID=13915372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4087456A Expired - Fee Related JP2992399B2 (en) | 1992-03-12 | 1992-03-12 | Chemical solution injection method and equipment used for it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2992399B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6206950B2 (en) * | 2013-07-12 | 2017-10-04 | 五洋建設株式会社 | Construction management method for high-pressure injection replacement method and filler discharge rod |
| KR101640241B1 (en) * | 2015-09-25 | 2016-07-22 | (주)케미우스코리아 | Pressure type grouting equipment for ground reinforcement and grouting method using that |
| CN106703038B (en) * | 2016-11-30 | 2019-01-29 | 上海建工集团股份有限公司 | A kind of horizontal reciprocating Grouting Pipe of mechanical non-return and its construction method |
-
1992
- 1992-03-12 JP JP4087456A patent/JP2992399B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05255926A (en) | 1993-10-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2224080C2 (en) | Self-moving boring device and method of removing methane gas from subterranean coal layer | |
| JP2992399B2 (en) | Chemical solution injection method and equipment used for it | |
| GB2279382A (en) | Reinforcing and consolidating ground | |
| JP2004346734A (en) | Device for injecting quick setting agent using high-speed jet fluid | |
| JP2949484B2 (en) | Injection solidification method and its injection device | |
| KR20050090306A (en) | An apparatus for mix-processing high pressure jet injection | |
| KR101985267B1 (en) | Grouting device for inhibiting slime discharge and grouting method for jet using the same | |
| JP2898154B2 (en) | Chemical injection device | |
| JP3795997B2 (en) | Method for reinforcing unconsolidated ground and apparatus for forming reinforcing body | |
| JP5400083B2 (en) | Ground improvement chemical injection pipe and ground improvement chemical injection method | |
| JP2554317B2 (en) | Drilling method on soft ground and apparatus used therefor | |
| JPH11173072A (en) | Chemical grouting method and chemical grouting equipment | |
| JP2772506B2 (en) | Ground improvement body preparation device and construction method | |
| JP4048430B2 (en) | Auger drilling head for bulb formation used in medium digging method | |
| KR102429463B1 (en) | High-pressure jet grouting system for real-time monitoring construction quality | |
| JPH09256767A (en) | High pressure water jet boring method and device thereof | |
| JP2004324274A (en) | Fluid jetting device of auger drill | |
| JPH0835390A (en) | Drilling device | |
| KR200206466Y1 (en) | Hammer injection grouting device | |
| JP2698762B2 (en) | Drilling bit and drilling method using the bit | |
| JP4349522B2 (en) | Ground improvement method | |
| JP4913494B2 (en) | Ground improvement device. | |
| JP4007219B2 (en) | Drilling tool and steel pipe tip receiving method | |
| JP2006283290A (en) | Soil improving method | |
| JP2006283290A5 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |