JP2785907B2 - Packer and soil compaction method using it - Google Patents

Packer and soil compaction method using it

Info

Publication number
JP2785907B2
JP2785907B2 JP5510195A JP5510195A JP2785907B2 JP 2785907 B2 JP2785907 B2 JP 2785907B2 JP 5510195 A JP5510195 A JP 5510195A JP 5510195 A JP5510195 A JP 5510195A JP 2785907 B2 JP2785907 B2 JP 2785907B2
Authority
JP
Japan
Prior art keywords
packer
chemical solution
borehole
steel pipe
chemical
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 - Lifetime
Application number
JP5510195A
Other languages
Japanese (ja)
Other versions
JPH08226119A (en
Inventor
一智 古跡
徹 羽馬
巌 中原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eneos Corp
Original Assignee
Nippon Petrochemicals Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Petrochemicals Co Ltd filed Critical Nippon Petrochemicals Co Ltd
Priority to JP5510195A priority Critical patent/JP2785907B2/en
Publication of JPH08226119A publication Critical patent/JPH08226119A/en
Application granted granted Critical
Publication of JP2785907B2 publication Critical patent/JP2785907B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は地山固結工法、特に岩盤
等(即ち未固結状態の地盤を含めた岩盤)に形成したボ
アホールを介して液状の樹脂やセメントミルク等の薬液
を注入して地山を固結する際に、該ボアホール内に設置
するパッカーおよびそれを用いた地山固結工法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground consolidation method, in particular, injecting a liquid resin or a liquid chemical such as cement milk through a borehole formed in rock or the like (that is, rock including unconsolidated ground). The present invention relates to a packer to be installed in the borehole when solidifying the ground, and a solidification method using the packer.

【0002】[0002]

【従来の技術】従来、例えばトンネル掘削工事を行う際
には、それに先立って或いはそれと並行して地盤を改良
する地山固結工法が行われており、そのような地山固結
工法を先受工法として利用することがある。更にその先
受工法には種々の工法があり、大別して鋼管を用いるも
のと、用いないものとがある。前者の鋼管を用いるもの
としては、例えばパイプルーフ工法やAGF工法等があ
る。
2. Description of the Related Art Conventionally, for example, when performing tunnel excavation work, a ground consolidation method for improving the ground is performed prior to or in parallel with the tunnel excavation work. May be used as a receiving method. Furthermore, there are various methods of prior construction, and there are two types: those using steel pipes and those not using them. Examples of the former using a steel pipe include a pipe roof method and an AGF method.

【0003】上記のような先受工法は、一般にトンネル
を掘削すべき箇所の前上部に位置する岩盤等にトンネル
掘削方向に向かって多数のボアホールを形成し、そのボ
アホールを介して岩盤に液状の合成樹脂やセメントミル
ク等の薬液を注入し固化させて、未固結或いは軟弱な岩
盤等の地山を固結せんとするもので、上記のパイプルー
フ工法やAGF工法等にあっては上記ボアホールの穿孔
と共にその内面に補強材として鋼管を設置してから薬液
を注入して一体的に固結させるものである。
[0003] In the above-mentioned pre-installation method, generally, a large number of boreholes are formed in a rock or the like located in front of a place where a tunnel is to be excavated in the tunnel excavation direction, and a liquid is formed in the rock through the borehole. A chemical solution such as synthetic resin or cement milk is injected and solidified to solidify unsolidified or soft ground such as bedrock. In the pipe roof method, AGF method, etc., the above-mentioned borehole is used. In addition to the perforation, a steel pipe is installed as a reinforcing material on the inner surface thereof, and then a chemical solution is injected and solidified integrally.

【0004】また上記のような薬液を注入する方式に
は、バルブ注入方式とステップ注入方式とがあり、ステ
ップ注入方式は前記ボアホール内にパッカーを設置し
て、注入すべき岩盤をボアホール深さ方向に沿って複数
個の領域に仕切り、その仕切られた領域毎に薬液を順に
注入していくという要求に基づいて提案されたものであ
る。これに用いるパッカーとしては、袋状に形成してそ
の中に薬液を充填する方式のものが用いられ、その充填
時に薬液の一部が前記のボアホールの壁面にも浸透して
良好に密閉できるようにパッカー全体を布製としたもの
も知られている。
[0004] In addition, there are a valve injection method and a step injection method as a method of injecting the chemical solution as described above. In the step injection method, a packer is installed in the borehole, and the rock to be injected is placed in the depth direction of the borehole. Are divided into a plurality of regions along the line, and a chemical solution is sequentially injected into each of the divided regions. As the packer used for this, a type that is formed in a bag shape and filled with a chemical solution is used, and at the time of filling, a part of the chemical solution penetrates into the wall surface of the bore hole so that it can be sealed well. It is also known that the entire packer is made of cloth.

【0005】[0005]

【発明が解決しようとする課題】ところが、上記のよう
な布製のパッカーを用いても、孔荒れによってパッカー
と孔壁との密着性が損なわれたり、或いはパッカーの周
囲以外の予期せぬ箇所に薬液が漏洩して、仕切りを形成
したい所望箇所に限定的に薬液を浸透させることができ
ない。特に、薬液として発泡性の樹脂を用いる場合には
浸透しずらい。そのため、注入すべき領域を必ずしも良
好に密閉した状態に仕切ることができず、そのパッカー
で仕切られた隣り合う一方の領域内に薬液を注入した際
に注入すべき領域以外の岩盤の亀裂等に薬液が流出し
て、目的の岩盤領域に充分に注入できない等のおそれが
ある。それを解消するために、例えば目の粗い布を用い
ると、ボアホールと密着していない部分にも多くの薬液
が浸み出し、パッカー設置箇所に的確なる仕切りを形成
することは困難であった。
However, even if a cloth packer as described above is used, the adhesion between the packer and the hole wall is impaired due to the roughening of the hole, or an unexpected portion other than the periphery of the packer is used. The chemical liquid leaks and the chemical liquid cannot be permeated to a desired portion where a partition is desired to be formed. In particular, when a foaming resin is used as the chemical solution, it hardly permeates. Therefore, it is not always possible to partition the area to be injected in a well-sealed state, and cracks in the rock, etc., other than the area to be injected when the chemical is injected into one adjacent area partitioned by the packer. There is a risk that the chemical solution may flow out and not be sufficiently injected into the target rock area. For example, if a coarse cloth is used in order to solve the problem, a large amount of the chemical liquid oozes into a portion that is not in close contact with the borehole, and it is difficult to form an accurate partition at a place where the packer is installed.

【0006】また前記のルーフパイプ工法やAGF工法
のようにボアホールの内面に鋼管を配置する工法にあっ
ては、その鋼管に形成した薬液吐出孔の内側にパッカー
が張り付いて鋼管の外側に浸透しずらく、これを防ぐた
めに薬液吐出孔を大きくすると、鋼管の剛性が低下する
等の不具合があり、また目の粗い布を用いても上記と同
様に所望されない箇所への薬液の漏洩の問題は必ずしも
改善されない等の問題があった。
In the method of disposing a steel pipe on the inner surface of a borehole such as the roof pipe method or the AGF method, a packer is attached to the inside of a chemical solution discharge hole formed in the steel pipe and penetrates the outside of the steel pipe. If the size of the chemical solution discharge hole is increased to prevent this, there is a problem that the rigidity of the steel pipe is reduced, and the problem of the leakage of the chemical solution to an undesired portion as described above even with a coarse cloth. Has not always been improved.

【0007】本発明は上記の問題点を簡単・確実に解消
することのできるパッカーおよびそれを用いた地山固結
工法を提供することを目的とする。
An object of the present invention is to provide a packer which can solve the above problems simply and surely, and a method of solidifying a ground using the same.

【0008】[0008]

【課題を解決するための手段】上記の目的を達成するた
めに、本発明によるパッカーおよび地山固結工法は以下
の構成としたものである。
Means for Solving the Problems In order to achieve the above object, a packer and a solidification method according to the present invention have the following constitutions.

【0009】即ち、本発明によるパッカーは、岩盤等に
形成したボアホール内に配置され、薬液を充填すること
によって上記ボアホール内を複数個の空間に仕切る略袋
状のパッカーであって、薬液充填時には両端部よりも中
央部が小径の全体略ダンベル状を呈し、かつ上記中央部
を通液性の材料で形成したことを特徴とする。
That is, the packer according to the present invention is a substantially bag-shaped packer which is disposed in a borehole formed in a bedrock or the like and fills the inside of the borehole into a plurality of spaces by filling a chemical solution. It is characterized in that the central part has a generally smaller dumbbell shape with a smaller diameter than the both ends, and is formed of a liquid-permeable material.

【0010】また本発明による地山固結工法は、パッカ
ーとして薬液充填時には両端部よりも中央部が小径の全
体略ダンベル状を呈し、かつ上記中央部のみを通液性の
材料で形成してなるパッカーを用い、岩盤等にボアホー
ルを形成し、そのボアホール内に上記袋状のパッカーを
配置し、そのパッカー内に薬液を充填し、該薬液を上記
中央部の外方へ通液させて該中央部の周囲の岩盤中に浸
透させることにより、固結すべき地山を上記ボアホール
深さ方向に沿って複数個の領域に仕切り、その仕切られ
た各領域毎に上記ボアホールを介して薬液を充填して岩
盤等を固結するようにしたことを特徴とする。なお上記
ボアホールの内面に鋼管を配置する場合には、鋼管の周
面に形成した薬液吐出孔の内方にパッカーの中央部が位
置するように配置して施工するものである。
[0010] In addition, in the soil compaction method according to the present invention, as a packer, when filling with a chemical solution, the central portion has a generally dumbbell shape with a smaller diameter at both ends than at both ends, and only the central portion is formed of a liquid-permeable material. Using a packer, a borehole is formed in a bedrock or the like, the bag-shaped packer is arranged in the borehole, a chemical solution is filled in the packer, and the chemical solution is allowed to flow out of the central portion. By infiltrating into the rock around the center, the ground to be consolidated is partitioned into a plurality of regions along the borehole depth direction, and a chemical solution is passed through the borehole for each partitioned region. It is characterized by filling and solidifying rocks and the like. When a steel pipe is arranged on the inner surface of the borehole, the steel pipe is arranged so that the center of the packer is located inside the chemical solution discharge hole formed on the peripheral surface of the steel pipe.

【0011】[0011]

【作用】本発明によるパッカーは、上記のように薬液充
填時は両端部よりも中央部が小径の全体略ダンベル状を
呈し、かつ上記中央部を通液性の材料で形成したから、
薬液充填時にパッカーの両端部がボアホール内面と密着
し、この状態でパッカー中央部の前記ボアホールに対面
する周面側から薬液が浸み出して、ボアホールの内面に
鋼管を配置しない場合にはボアホールの内壁面から直接
岩盤中に、鋼管を配置するものにあっては鋼管に形成し
た薬液吐出孔を介して該鋼管とボアホール内壁面間さら
にボアホールの内壁面から岩盤中に浸透し、ボアホール
内を密閉状態に仕切り、注入すべき岩盤を良好に複数の
領域に仕切ることが可能となる。
The packer according to the present invention has a substantially dumbbell shape with a smaller diameter at the center than at both ends when filled with the chemical solution as described above, and is formed of a liquid-permeable material at the center.
At the time of filling the chemical solution, both ends of the packer are in close contact with the inner surface of the bore hole, and in this state, the chemical solution oozes out from the peripheral surface facing the bore hole at the center of the packer, and when the steel pipe is not disposed on the inner surface of the bore hole, In the case where a steel pipe is placed directly in the rock from the inner wall surface, it penetrates between the steel pipe and the inner wall surface of the borehole and from the inner wall surface of the borehole into the rock through the chemical solution discharge hole formed in the steel pipe, and seals the inside of the borehole. It is possible to divide the bedrock to be poured into a plurality of regions in a good condition.

【0012】また本発明による地山固結工法は、上記の
ようなパッカーを用いることによってボアホール周囲の
岩盤を良好に複数の領域に仕切ることができるので、そ
の仕切られた各領域の岩盤中に薬液を注入する際に、隣
り合う地山領域に薬液が漏洩することなく、各領域毎に
良好に且つ均等に薬液を注入することが可能となる。
[0012] Further, according to the soil compaction method according to the present invention, the rock around the borehole can be partitioned into a plurality of regions by using the above-mentioned packer, so that the rock in each of the partitioned regions can be separated. At the time of injecting a chemical solution, it is possible to satisfactorily and evenly inject the chemical solution into each of the regions without leaking the chemical solution to adjacent ground regions.

【0013】[0013]

【実施例】以下、図に示す実施例に基づいて本発明によ
るパッカーおよびそれを用いた地山固結工法を具体的に
説明する。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a packer according to the present invention, and FIG.

【0014】図1は本発明によるパッカーの一実施例を
示す正面図である。図示例のパッカー1は、両端部11
・11と、その間の中央部12とを異なる材質のシート
状の材料を縫合して袋状に形成したもので、薬液を充填
した状態においては図のように両端部11・11よりも
中央部12が小径の全体略ダンベル状を呈するように形
成され、上記中央部12は通液性の材料が用いられてい
る。
FIG. 1 is a front view showing an embodiment of a packer according to the present invention. The packer 1 in the illustrated example has both end portions 11.
11 and a central portion 12 therebetween are formed into a bag shape by sewing a sheet-like material of a different material, and in a state filled with a chemical solution, the central portion is wider than both end portions 11 as shown in the figure. The central portion 12 is formed of a liquid-permeable material.

【0015】上記各部11・12の具体的な材質は適宜
であるが、中央部12の材質としては、好ましくは伸縮
性の少ないものがよく、例えばさらし等の布地を用いる
ことができる。また両端部11・11の材質は、通液性
のない又は少ないもので好ましくは薬液を充填以前には
収縮あるいは折畳み状態を呈し、薬液充填によって拡径
し得るものがよく、例えば軟質の合成樹脂シート材やラ
ミネート材等を用いることができる。なお例えば中央部
に多数の微細な小孔を形成する等して通液性を持たせれ
ば中央部と両端部とを同材質のもので構成することも可
能である。
Although the specific material of the above-mentioned parts 11 and 12 is appropriate, the material of the central part 12 is preferably a material having little elasticity. For example, a cloth such as a bleached cloth can be used. The material of the both ends 11 is preferably a material having no or little liquid permeability, preferably showing a contracted or folded state before filling with the chemical solution, and expanding the diameter by filling with the chemical solution, for example, a soft synthetic resin. A sheet material, a laminate material, or the like can be used. Note that the central portion and both end portions can be made of the same material as long as liquid permeability is provided, for example, by forming a number of fine small holes in the central portion.

【0016】また各部11・12の外径寸法や長さ寸法
は適宜であるが、少なくとも両端部11・11の外径寸
法は、薬液を充填した状態において、鋼管を用いる工法
にあってはその内面、鋼管を用いない工法にあってはボ
アホールHの内面に所定のつぶれ代以上分だけ充分に密
着する大きさに形成し、また中央部12は鋼管またはボ
アホールよりも充分に小さく(即ち、パッカー1全体が
膨らんでも中央部12は鋼管またはボアホールの内壁と
離間した状態となるように)形成する。
The outer diameters and lengths of the respective parts 11 and 12 are appropriate, but at least the outer diameters of both ends 11 and 11 are different from those of a method using a steel pipe in a state filled with a chemical solution. In the method using no inner surface or a steel pipe, the inner surface of the bore hole H is formed to have a size enough to be in contact with the inner surface of the bore hole H by a predetermined crushing allowance or more. The central portion 12 is formed such that the central portion 12 is separated from the inner wall of the steel pipe or the bore hole even if the whole 1 is expanded.

【0017】図2は上記のパッカーをステップ注入方式
によるパイプルーフ工法に適用した例を示す使用状態の
縦断面図、図3はその一部の拡大図である。図におい
て、Hはトンネルを掘削すべき箇所の上部に形成したボ
アホールで、そのボアホールH内に鋼管2が挿入配置さ
れ、その鋼管2内に本実施例においては2つのパッカー
1a・1bが配置されている。上記の鋼管2には長手方
向複数箇所に周方向略等間隔に複数個の薬液吐出孔2a
が形成され、そのいずれかの薬液吐出孔2aの内方に上
記各パッカー1a・1bの中央部12が位置するよう配
置されている。
FIG. 2 is a longitudinal sectional view of a use state showing an example in which the above-mentioned packer is applied to a pipe roof method by a step injection method, and FIG. 3 is an enlarged view of a part thereof. In the figure, H is a borehole formed above a place where a tunnel is to be excavated. A steel pipe 2 is inserted into the borehole H, and two packers 1a and 1b are arranged in the steel pipe 2 in this embodiment. ing. In the steel pipe 2, a plurality of chemical solution discharge holes 2a are provided at a plurality of locations in the longitudinal direction at substantially equal intervals in the circumferential direction.
Is formed, and the central portion 12 of each of the packers 1a and 1b is disposed inside one of the chemical solution discharge holes 2a.

【0018】図中、3a・3bは上記各パッカー1a・
1bに薬液を充填する薬液充填管、4a〜4cはパッカ
ー1a・1bで仕切られたボアホールH内の空間5a〜
5c内に薬液を注入する薬液注入管で、上記各パッカー
1a・1bは薬液充填管3の端部および薬液注入管4の
周面を覆うように配置され、例えば図3に示すように各
パッカー1の両端縁部をバンド6等で締め付けることに
よって固着するものである。図2において、7は鋼管1
とボアホールHとの間の端部開口を塞ぐゴム栓状のシー
ル部材、8は鋼管1の端部に嵌めたシール部材抜け止め
用のキャップである。
In the figure, reference numerals 3a and 3b denote the respective packers 1a and 3a.
Chemical liquid filling tubes 4a to 4c for filling the liquid chemical into 1b are spaces 5a to 5b in the borehole H partitioned by the packers 1a and 1b.
Each of the packers 1a and 1b is disposed so as to cover the end of the chemical filling tube 3 and the peripheral surface of the chemical injecting tube 4, and for example, as shown in FIG. 1 are fixed by tightening both end edges with a band 6 or the like. In FIG. 2, 7 is a steel pipe 1
A seal member 8 in the form of a rubber plug for closing an end opening between the steel tube 1 and the bore hole H, and a cap 8 for preventing the seal member from slipping off is fitted to the end of the steel pipe 1.

【0019】次に、上記のような地山固結工法を施工す
る場合のプロセスの一例を、図4および図5に基づいて
順に説明する。先ず、図4の(a)に示すように地山の
所定の位置にドリル等で所定の深さのボアホールHを穿
設形成し、当該穿設工程に伴って、そのボアホールH内
に鋼管2を挿入配置する。その穿孔方法や鋼管挿入方法
は適宜であり、例えば回転するドリル軸の先端に穿孔用
ビットを有するドリルでボアホールを開けながら、その
ボアホールH内に鋼管を順次押し込んで行き、所定の深
さまで穿孔されたところでドリルを引き抜けばよい。
Next, an example of a process for applying the above-mentioned solidification method will be described in order with reference to FIGS. First, as shown in FIG. 4A, a borehole H having a predetermined depth is formed in a predetermined position of the ground by a drill or the like, and a steel pipe 2 is formed in the borehole H with the drilling process. Insert and place. The drilling method and steel pipe insertion method are appropriate.For example, while drilling a bore hole with a drill having a drill bit at the tip of a rotating drill shaft, the steel pipe is sequentially pushed into the bore hole H, and drilled to a predetermined depth. You just need to pull out the drill where you left off.

【0020】そして上記の鋼管2に、図4の(b)のよ
うにパッカー1a・1bと薬液充填管3a・3bおよび
薬液注入管4a〜4cを挿入するもので、その際、それ
らのパッカーと薬液充填管および薬液注入管は予め一体
的に組付けてから鋼管2内に装填することができる。ま
た各パッカー1a・1bは、その中央部12が鋼管2に
形成した薬液吐出孔2aの内方に位置するように配置
し、鋼管2の端部開口をシール部材7で塞ぐと共に、キ
ャップ8で抜け止め係止する。なお、各パッカー1a・
1bは、その中央部12の長さ(図1で左右方向長さ)
を大きめにしておけば、鋼管2内にセットしたときに、
容易に該中央部12を薬液吐出孔2a位置に位置決めす
ることができる。
Then, the packers 1a and 1b, the chemical filling tubes 3a and 3b, and the chemical injecting tubes 4a to 4c are inserted into the steel tube 2 as shown in FIG. 4 (b). The chemical filling tube and the chemical injecting tube can be loaded into the steel pipe 2 after being assembled in advance integrally. Each of the packers 1a and 1b is arranged such that the center portion 12 is located inside the chemical solution discharge hole 2a formed in the steel pipe 2, and the end opening of the steel pipe 2 is closed with a sealing member 7 and the cap 8 is used. Lock the stopper. Each packer 1a
1b is the length of the central portion 12 (length in the left-right direction in FIG. 1)
If you make it larger, when it is set in the steel pipe 2,
The center portion 12 can be easily positioned at the position of the chemical solution discharge hole 2a.

【0021】次いで、上記各パッカー1a・1bに薬液
充填管3a・3bを介して液状の合成樹脂やセメントミ
ルク等の薬液を充填してボアホールHの周囲の岩盤中に
仕切りを形成すると共に、その各パッカー1a・1b位
置で仕切られた岩盤の各領域に、薬液注入管4a〜4c
からボアホールH内の空間5a〜5cを介して薬液を注
入するもので、そのパッカー1a・1bに充填する薬液
と上記岩盤中の各領域に注入する薬液とは、同材質ある
いは異なる材質のいずれでもよい。
Next, each of the packers 1a and 1b is filled with a liquid chemical such as a liquid synthetic resin or cement milk through the liquid chemical filling pipes 3a and 3b to form partitions in the rock around the borehole H. Chemical solution injection pipes 4a to 4c are provided in each area of the bedrock partitioned at the positions of the packers 1a and 1b.
And the chemical liquid to be filled into the packers 1a and 1b and the chemical liquid to be injected into each area in the rock are the same or different. Good.

【0022】また上記の薬液をパッカー1a・1bおよ
び上記空間5a〜5cに充填もしくは注入する順序は適
宜であるが、例えば以下の順序で行う。先ず、図4の
(c)に示すように奥側のパッカー1aに薬液充填管3
aを介して薬液を注入する。すると、先ずパッカー1a
の両端部11・11が膨らんで鋼管2の内面に密着し、
次いで同図(d)のように通液性を有するパッカー中央
部12から薬液が浸み出して、その中央部12と鋼管2
との間に形成されたリング状の間隙g内に一旦流出す
る。即ち、これにて鋼管2内の空間5aが密閉状態とな
る。さらに薬液は鋼管2の薬液吐出孔2aから鋼管2の
外側のボアホールHに形成されたリング状の部分に流出
し、これにて鋼管2の外側がシールされる。さらに、そ
のボアホールHの壁面からパッカー1の周囲の岩盤中に
浸透して固化する。それによって鋼管2の内外両側に密
閉性のよい仕切壁が形成される。
The order of filling or injecting the above-mentioned chemicals into the packers 1a and 1b and the above-mentioned spaces 5a to 5c is arbitrary. First, as shown in FIG. 4 (c), the chemical filling tube 3 is placed on the backside packer 1a.
A drug solution is injected through a. Then, first the packer 1a
Both ends 11 ・ 11 of the swelling are inflated and adhere to the inner surface of the steel pipe 2,
Next, as shown in FIG. 4D, the chemical liquid oozes out from the central part 12 of the packer having liquid permeability, and the central part 12 and the steel pipe 2 are leached.
Once flows out into the ring-shaped gap g formed between them. That is, the space 5a in the steel pipe 2 is now in a sealed state. Further, the chemical liquid flows out from the chemical liquid discharge hole 2a of the steel pipe 2 to a ring-shaped portion formed in the bore hole H outside the steel pipe 2, thereby sealing the outside of the steel pipe 2. Furthermore, it penetrates into the rock around the packer 1 from the wall surface of the borehole H and solidifies. Thereby, partition walls having good airtightness are formed on both the inner and outer sides of the steel pipe 2.

【0023】なお上記パッカーへの薬液の注入量は、非
発泡性の薬液を用いる場合には、パッカーを膨らませる
のに充分な量の他に、上記リング状の間隙g内と、鋼管
1の外側のボアホールHとの間、およびボアホールHの
壁面から岩盤中に浸透する液量を勘案して充填すればよ
い。また薬液として発泡性の樹脂等を用いる場合には、
パッカーが膨らんだときの容積とほぼ等しい程度の薬液
を注入すればよく、パッカーに注入した後はそれが発泡
することによって上記の間隙g内と、鋼管2の外側のボ
アホールHとの間、およびパッカー周囲の岩盤中に浸透
させることができる。
When a non-foaming chemical is used, the amount of the chemical solution injected into the packer is not only an amount sufficient to expand the packer, but also the inside of the ring-shaped gap g and the steel pipe 1. The filling may be performed in consideration of the amount of liquid permeating into the rock from the outer borehole H and from the wall surface of the borehole H. When using a foaming resin or the like as the chemical,
It suffices to inject a chemical solution having a volume substantially equal to the volume when the packer is expanded, and after injecting into the packer, by foaming it, between the above-mentioned gap g and the borehole H outside the steel pipe 2, and It can penetrate into the rock around the packer.

【0024】上記のようにして奥側のパッカー1aに薬
液を充填し固化させて鋼管2の内外両側に仕切壁を形成
したところで、図5の(a)のようにパッカー1aより
も奥側の鋼管2内の空間5aに薬液注入管4aを介して
薬液を注入する。すると、鋼管2内に薬液が充填される
と共に、その薬液が鋼管2の先端開口および鋼管2に形
成した薬液吐出孔2aから鋼管2の外側のボアホールH
との間に流出し、さらにボアホールHの壁面から空間5
a周囲の領域の岩盤中に浸透していく。そのとき、空間
5b側には前記のようにパッカー1aによる密閉性のよ
い仕切壁が鋼管2の内外および岩盤中に亘る形で形成さ
れているので、上記の空間5aから注入した薬液が空間
5b周囲の岩盤領域側に洩れることなく良好に所定領域
の岩盤中に限定的に薬液が注入され、当該領域岩盤の的
確なる地盤改良が図られるものである。
As described above, the inner packer 1a is filled with a chemical solution and solidified to form partition walls on the inner and outer sides of the steel pipe 2. As shown in FIG. 5 (a), the inner packer 1a is deeper than the packer 1a. The chemical is injected into the space 5a in the steel pipe 2 via the chemical injection pipe 4a. Then, the chemical is filled in the steel pipe 2, and the chemical is supplied from the opening of the distal end of the steel pipe 2 and the chemical discharge hole 2 a formed in the steel pipe 2 to the bore hole H outside the steel pipe 2.
And the space 5 from the wall of the borehole H.
aThey penetrate into the rock around the area. At this time, since the partition wall having good sealing performance by the packer 1a is formed on the space 5b side as described above so as to extend inside and outside the steel pipe 2 and in the rock, the chemical solution injected from the space 5a is filled with the space 5b. The chemical solution is injected into the rock in a predetermined area satisfactorily without leaking to the surrounding rock area, and the appropriate ground improvement of the rock in the area is achieved.

【0025】次に図5の(b)のように他方のパッカー
1bにも上記と同様の要領で薬液を充填し固化させて該
パッカー1b位置の鋼管2内外に仕切壁を形成した後、
同図(c)のように上記パッカー1bよりも奥側の空間
5bから薬液注入管4bを介して該空間5b周囲の領域
の岩盤中に薬液を注入し、さらに同図(d)のようにボ
アホールHの開口側の空間5cからも薬液注入管4cを
介して薬液を該空間5c周囲の岩盤中に注入して固化さ
せる。それによって鋼管2の周囲の岩盤に該鋼管の略全
長にわたって薬液を万遍なく均一に、即ち所定領域のみ
に偏って注入が施され、薬液の行き亘らない未改良岩盤
部分が生じる懸念なく充填・固化させることができるも
のである。
Next, as shown in FIG. 5B, the other packer 1b is filled with a chemical solution in the same manner as above and solidified to form partition walls inside and outside the steel pipe 2 at the position of the packer 1b.
As shown in FIG. 3C, a chemical solution is injected into the rock around the space 5b from the space 5b farther than the packer 1b through the chemical solution injection pipe 4b as shown in FIG. From the space 5c on the opening side of the borehole H, the chemical is injected into the rock around the space 5c through the chemical injection pipe 4c and solidified. As a result, the chemical around the steel pipe 2 is evenly and uniformly injected with the chemical solution over substantially the entire length of the steel pipe 2, that is, the chemical solution is injected only in a predetermined area, and the unimproved rock part where the chemical solution does not reach is filled without concern.・ It can be solidified.

【0026】なお前述のようにパッカーおよびこれによ
って仕切られた岩盤各領域への薬液の充填順序は適宜で
あり、たとえば全てのパッカーに薬液を同時に充填して
固化させたのち、それらのパッカーで仕切られた鋼管内
の空間から、各岩盤領域に同時に薬液を注入して固化さ
せることもできる。また1つのボアホールに使用するパ
ッカーの個数も任意である。
As described above, the order of filling the packers and the respective parts of the bedrock with the chemical solution is arbitrary. For example, all the packers are simultaneously filled with the chemical solution and solidified, and then partitioned by those packers. From the space in the steel pipe thus set, a chemical solution can be simultaneously injected into each of the rock areas to be solidified. The number of packers used for one borehole is also arbitrary.

【0027】またパッカーへの薬液充填管3a・3bや
仕切り空間内への薬液注入管4a〜4cの材質は適宜で
あり、それらの管の少なくとも1つを例えば図6に示す
ように中心に薬液注入孔41aを有する鋼管または異形
鋼管41に代える、あるいは上記の充填管3a・3bや
注入管4a〜4cとともに上記鋼管や異形鋼棒を併用す
ることもできる。そのようにすると、鋼管や異形鋼棒の
剛性を利用してパイプルーフの強度を増大させ、一層確
実なる地山の安定化を図ることが可能となる。
The material of the chemical filling tubes 3a and 3b into the packer and the chemical injecting tubes 4a to 4c into the partition space are appropriate, and at least one of these tubes is centered as shown in FIG. Instead of the steel pipe having the injection hole 41a or the deformed steel pipe 41, the above-described steel pipe and the deformed steel rod can be used together with the above-mentioned filling pipes 3a and 3b and the injection pipes 4a to 4c. In this case, the strength of the pipe roof can be increased by utilizing the rigidity of the steel pipe or the deformed steel bar, and the ground can be more reliably stabilized.

【0028】さらに本発明は上記のような鋼管や鋼棒を
用いることによってボアホールHの内面に配置される鋼
管を省略した工法にも適用できる。図7は中心に薬液注
入孔41aを有する鋼管41を仕切り空間内への薬液注
入管として用いた例、図8は薬液注入管4aやパッカー
への薬液充填管3aとともに異形鋼棒9を用いた例を示
すもので、いずれの場合にもボアホールHの内面に配置
される鋼管は省略されている(即ち、穿孔後に撤去され
るか、或いは鋼管を用いずに穿孔される)。この場合、
パッカー1は薬液を充填することによって両端部11・
11がボアホールHの内面に直接圧接し、次いで中央部
12から浸み出た薬液は、その中央部12とボアホール
Hとの間の隙間gに一旦溜まった後、ボアホール壁面か
ら該中央部12の放射方向外側の岩盤中に浸透すること
によって前記実施例と同様に密閉性のよい仕切壁を形成
することができる。
Further, the present invention can be applied to a construction method in which the steel pipe arranged on the inner surface of the borehole H is omitted by using the steel pipe or the steel rod as described above. FIG. 7 shows an example in which a steel pipe 41 having a chemical liquid injection hole 41a at the center is used as a chemical liquid injection pipe into a partition space, and FIG. 8 uses a deformed steel rod 9 together with a chemical liquid injection pipe 4a and a chemical liquid filling pipe 3a for a packer. By way of example, in each case the steel pipe arranged on the inner surface of the borehole H is omitted (ie removed after drilling or drilled without steel pipe). in this case,
The packer 1 is filled with a chemical solution so that both ends 11.
11 presses directly against the inner surface of the borehole H, and the chemical liquid that has leached from the central portion 12 once collects in the gap g between the central portion 12 and the borehole H, and then is removed from the borehole wall surface. By penetrating into the rock outside in the radial direction, it is possible to form a partition wall having good airtightness as in the above embodiment.

【0029】[0029]

【発明の効果】以上説明したように本発明によるパッカ
ーは、薬液充填時には両端部よりも中央部が小径の全体
略ダンベル状を呈し、かつ上記中央部を通液性の材料で
形成したから、薬液充填時にパッカーの両端部がボアホ
ール内面と密着し、この状態でパッカー中央部の前記ボ
アホールに対面する周面側から薬液が浸み出して、ボア
ホールの内面に鋼管を配置しない場合にはボアホールの
内壁面から直接岩盤中に、鋼管を配置するものにあって
は鋼管に形成した薬液吐出孔を介して該鋼管とボアホー
ル内壁面間さらにボアホールの内壁面から岩盤中に浸透
し、ボアホール内を密閉状態に仕切り、注入すべき岩盤
を良好に複数の領域に仕切ることができる。また本発明
による地山固結工法は、上記のようなパッカーを用いる
ことによってボアホール周囲の岩盤を良好に複数の領域
に仕切ることができるので、その仕切られた各領域の岩
盤中に薬液を注入する際に、隣り合う地山領域に薬液が
漏洩することなく、各領域毎に良好に且つ均等に薬液を
注入することが可能となり、岩盤等を安定かつ強固に固
結できる等の効果がある。
As described above, the packer according to the present invention has a generally dumbbell shape with a smaller diameter at the center than both ends at the time of filling with the chemical solution, and is formed of a liquid-permeable material at the center. At the time of filling the chemical solution, both ends of the packer are in close contact with the inner surface of the bore hole, and in this state, the chemical solution oozes out from the peripheral surface facing the bore hole at the center of the packer, and when the steel pipe is not disposed on the inner surface of the bore hole, In the case where a steel pipe is placed directly in the rock from the inner wall surface, it penetrates between the steel pipe and the inner wall surface of the borehole and from the inner wall surface of the borehole into the rock through the chemical solution discharge hole formed in the steel pipe, and seals the inside of the borehole. It is possible to partition the rock to be poured into a plurality of areas in a good condition. In addition, since the rock solidification method according to the present invention can satisfactorily partition the rock around the borehole into a plurality of regions by using the above-mentioned packer, the chemical solution is injected into the rock in each of the partitioned regions. In this case, it is possible to inject the chemical solution in each region satisfactorily and evenly without leaking the chemical solution to the adjacent ground area, and it is possible to stably and firmly solidify the rock and the like. .

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明によるパッカーの一実施例を示す一部縦
断正面図。
FIG. 1 is a partially longitudinal front view showing an embodiment of a packer according to the present invention.

【図2】上記パッカーの使用状態の一例を示す縦断面
図。
FIG. 2 is a longitudinal sectional view showing an example of a use state of the packer.

【図3】上記使用例の一部の拡大縦断面図。FIG. 3 is an enlarged vertical sectional view of a part of the above-mentioned use example.

【図4】本発明による地山固結工法の一例を示すプロセ
ス説明図。
FIG. 4 is a process explanatory view showing an example of the ground compaction method according to the present invention.

【図5】本発明による地山固結工法の一例を示すプロセ
ス説明図。
FIG. 5 is a process explanatory view showing an example of the ground compaction method according to the present invention.

【図6】他の施工例を示す説明図。FIG. 6 is an explanatory view showing another construction example.

【図7】他の施工例を示す説明図。FIG. 7 is an explanatory view showing another construction example.

【図8】他の施工例を示す説明図。FIG. 8 is an explanatory view showing another construction example.

【符号の説明】 1、1a、1b パッカー 11、11 端部 12 中央部 2 鋼管 2a 薬液吐出孔 3 薬液充填管 4 薬液注入管 H ボアホール[Description of Signs] 1, 1a, 1b Packer 11, 11 End part 12 Central part 2 Steel pipe 2a Chemical liquid discharge hole 3 Chemical liquid filling pipe 4 Chemical liquid injection pipe H Borehole

───────────────────────────────────────────────────── フロントページの続き (72)発明者 中原 巌 東京都渋谷区桜丘町15番17号 日本基礎 技術株式会社内 (56)参考文献 特開 平3−87412(JP,A) 特開 平2−221592(JP,A) 特開 昭59−48518(JP,A) (58)調査した分野(Int.Cl.6,DB名) E02D 3/12 E21D 9/04──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Iwao Nakahara 15-17 Sakuragaoka-cho, Shibuya-ku, Tokyo Inside Japan Basic Technology Co., Ltd. (56) References JP-A-3-87412 (JP, A) JP-A-2 -221592 (JP, A) JP-A-59-48518 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) E02D 3/12 E21D 9/04

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 岩盤等に形成したボアホール内に配置さ
れ、薬液を充填することによって上記ボアホール内を複
数個の空間に仕切る略袋状のパッカーであって、薬液充
填時には両端部よりも中央部が小径の全体略ダンベル状
を呈し、かつ上記中央部を通液性の材料で形成したこと
を特徴とするパッカー。
1. A substantially bag-shaped packer which is disposed in a borehole formed in a bedrock or the like, and which fills the inside of the borehole into a plurality of spaces by filling a chemical solution. A packer having a substantially dumbbell shape with a small diameter as a whole and formed of a liquid-permeable material at the central portion.
【請求項2】 パッカーとして薬液充填時には両端部よ
りも中央部が小径の全体略ダンベル状を呈し、かつ上記
中央部のみを通液性の材料で形成してなるパッカーを用
い、 岩盤等にボアホールを形成し、そのボアホール内に上記
袋状のパッカーを配置し、そのパッカー内に薬液を充填
し、該薬液を上記中央部の外方へ通液させて該中央部の
周囲の岩盤中に浸透させることにより、固結すべき地山
を上記ボアホール深さ方向に沿って複数個の領域に仕切
り、その仕切られた各領域毎に上記ボアホールを介して
薬液を充填して岩盤等を固結するようにしたことを特徴
とする地山固結工法。
2. A packer having a generally dumbbell shape with a smaller diameter at both ends than at both ends when filling with a chemical solution, and having only the center portion formed of a liquid-permeable material. Is formed, the bag-shaped packer is arranged in the borehole, a chemical solution is filled in the packer, and the chemical solution is allowed to flow outside the central portion to penetrate into the rock around the central portion. By doing so, the ground to be consolidated is divided into a plurality of regions along the borehole depth direction, and each partitioned region is filled with a chemical solution through the borehole to consolidate rock or the like. The soil compaction method characterized by the above.
【請求項3】 前記ボアホールの内面に、周面に薬液吐
出孔を有する鋼管を配置し、その鋼管内に前記パッカー
を、その中央部が上記薬液吐出孔の略内方に位置するよ
うにして配置することを特徴とする請求項2記載の地山
固結工法。
3. A steel pipe having a chemical solution discharge hole on a peripheral surface is disposed on an inner surface of the bore hole, and the packer is placed in the steel pipe such that a center portion thereof is located substantially inside the chemical solution discharge hole. 3. The method of solidifying a ground mountain according to claim 2, wherein the soil is laid.
JP5510195A 1995-02-20 1995-02-20 Packer and soil compaction method using it Expired - Lifetime JP2785907B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5510195A JP2785907B2 (en) 1995-02-20 1995-02-20 Packer and soil compaction method using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5510195A JP2785907B2 (en) 1995-02-20 1995-02-20 Packer and soil compaction method using it

Publications (2)

Publication Number Publication Date
JPH08226119A JPH08226119A (en) 1996-09-03
JP2785907B2 true JP2785907B2 (en) 1998-08-13

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ID=12989365

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Country Link
JP (1) JP2785907B2 (en)

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KR100791446B1 (en) * 2007-01-10 2008-01-04 하리컨설턴트 주식회사 Device for preventing leakage of grout material
JP2008248488A (en) * 2007-03-29 2008-10-16 Kfc Ltd Slope stabilizing method and slope construction equipment
KR100741884B1 (en) * 2007-04-24 2007-07-23 주식회사 도담이앤씨 Apparatus and method for obturating a tubular well
KR100741883B1 (en) * 2007-04-24 2007-07-23 주식회사 도담이앤씨 Apparatus and method for obturating a tubular well
CN110130925A (en) * 2019-05-17 2019-08-16 深圳市综合交通设计研究院有限公司 The composite reinforcing method of rock pillar in a kind of small interval city tunnel
CN110607734B (en) * 2019-09-25 2021-07-02 汪丹 Asphalt pavement paving equipment with adjustable angle

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