JP3125033B2 - Construction method of improved wall - Google Patents
Construction method of improved wallInfo
- Publication number
- JP3125033B2 JP3125033B2 JP08041300A JP4130096A JP3125033B2 JP 3125033 B2 JP3125033 B2 JP 3125033B2 JP 08041300 A JP08041300 A JP 08041300A JP 4130096 A JP4130096 A JP 4130096A JP 3125033 B2 JP3125033 B2 JP 3125033B2
- Authority
- JP
- Japan
- Prior art keywords
- improved
- rotary head
- nozzle
- rod
- wall
- 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)
- Foundations (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、改良壁の施工方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an improved wall.
【０００２】[0002]
【従来の技術】例えば、港湾等における護岸後方や下部
の地盤が地震等の原因により流動化すると、ケーソン等
の構造物が破壊して大きな被害が発生するおそれがあ
る。そこで、この地盤流動化に対処する方法のひとつと
して、また、止水などを図るために、地盤を改良壁で複
数の室に仕切る方法がある。2. Description of the Related Art For example, when the ground behind and below a revetment in a port or the like is fluidized due to an earthquake or the like, there is a possibility that a structure such as a caisson is broken and serious damage is caused. Therefore, as one method of coping with the fluidization of the ground, there is a method of dividing the ground into a plurality of chambers with improved walls in order to prevent water from flowing.
【０００３】かかる改良壁の施工方法として、従来は、
例えばＳＭＷ工法（原位置土混合工法）などによる地中
連続壁工法によっており、これは、原地盤を地上から１
エレメント単位で鉛直方向の壁体状に掘削し、この際に
混練軸先端よりセメント、ベントナイト等の目的に適応
した混合液を吐出させて、土中において原位置土と混合
して、１エレメントのソイルセメント壁体を造成する。
このようにして造成されたソイルセメント壁の各エレメ
ントを完全にラップさせて一体に連結した壁体を形成す
る。[0003] As a construction method of such an improved wall, conventionally,
For example, the underground continuous wall method such as the SMW method (in situ soil mixing method) is used.
Excavation is performed in a vertical wall shape in units of elements, and at this time, a mixed liquid suitable for the purpose, such as cement or bentonite, is discharged from the tip of the kneading shaft, and mixed with the in-situ soil in the soil to form one element. Create a soil cement wall.
The elements of the soil cement wall thus formed are completely wrapped to form an integrally connected wall.
【０００４】[0004]
【発明が解決しようとする課題】かかる工法では長い壁
体を造成する場合は、１エレメント単位のソイルセメン
ト壁体を数多く上から削孔造成することになり、装置の
段取り、移動に時間と手間を要して施工効率がよくな
い。In the case of forming a long wall by such a method, a large number of soil cement walls of one element unit must be drilled from the top, and it takes time and effort to set up and move the apparatus. And the construction efficiency is not good.
【０００５】また、地上から削孔して造成するため、ケ
ーソンなどの既存構造物の下部に改良壁を造成すること
は困難である。[0005] In addition, since the hole is formed by drilling from the ground, it is difficult to form an improved wall below an existing structure such as a caisson.
【０００６】本発明の目的は前記従来例の不都合を解消
し、一回の削孔で長い範囲に改良壁を造成でき、ケーソ
ンなどの既存の構造物の下部にも容易に施工できる改良
壁の施工方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to form an improved wall over a long range with a single drilling, and to easily apply it to the lower part of an existing structure such as a caisson. It is to provide a construction method.
【０００７】[0007]
【課題を解決するための手段】本発明は前記目的を達成
するため、可撓性のロッドの先端の回転ヘッドに掘削ビ
ットと、回転ヘッドの回転方向と同方向に回転し噴射方
向が回転軸と直行する方向のノズルとを設けて掘削機を
構成し、該掘削機のロッドを鉛直に施工した導口内に挿
入し、回転ヘッドを回転して掘削ビットで水平方向に削
孔し、所定長を削孔後、ロッドを引き抜きながらノズル
を回転し、該ノズルからセメントミルク等の固結材とジ
ェット水を噴射して水平柱状に改良柱を造成し、この改
良柱を並べて水平、垂直、斜めの方向に改良壁を造成す
ること、および、回転ヘッドに水力モータを設け、該水
力モータの回転力により回転ヘッドを回転させることを
要旨とするものである。According to the present invention, in order to achieve the above object, a rotary head at the tip of a flexible rod is provided with a drill bit, and the rotary head is rotated in the same direction as the rotation direction of the rotary head so that the injection direction is the rotation axis. And a nozzle in a direction perpendicular to the excavator, and a rod of the excavator is inserted into a vertically constructed conduit, a rotating head is rotated, and a drill bit is used to drill a hole in a horizontal direction, and a predetermined length is formed. After drilling the hole, rotate the nozzle while pulling out the rod, spraying consolidation material such as cement milk and jet water from the nozzle to create an improved column in the form of a horizontal column, arranging this improved column horizontally, vertically, diagonally The purpose of the present invention is to form an improved wall in the direction of (1) and to provide a hydraulic motor on the rotary head, and to rotate the rotary head by the rotational force of the hydraulic motor.
【０００８】請求項１記載の本発明によれば、鉛直に施
工した導口内に可撓性のロッドを備えた掘削機を挿入
し、所定の深度からロッドの先端の掘削ビットで水平方
向に所定長削孔し、ロッドを引き抜きながらノズルを回
転し、該ノズルからセメントミルク等の固結材とジェッ
ト水を噴射すれば水平柱状に改良柱が造成される。According to the first aspect of the present invention, an excavator equipped with a flexible rod is inserted into a vertically installed conduit, and a predetermined depth is set in a horizontal direction with a drill bit at the tip of the rod. When the nozzle is rotated while drilling a long hole and pulling out the rod, and a jet of condensing material such as cement milk and jet water are jetted from the nozzle, an improved column is formed in a horizontal column shape.
【０００９】よって、導口に沿って水平柱状の改良柱を
何段階かに分けて連続させて複数施工すれば、壁状のも
のとなり、一つの導口を掘削するだけで改良壁を造成で
きる。また、ロッドは可撓性であるから、鉛直方向から
水平方向に曲がり、構造物の下方でも改良壁を容易に造
成できる。[0009] Therefore, if a plurality of horizontal pillar-shaped improved pillars are continuously formed along the spout in several stages and formed continuously, it becomes a wall-shaped one, and an improved wall can be formed by only excavating one spout. . Further, since the rod is flexible, it is bent in the horizontal direction from the vertical direction, and the improved wall can be easily formed even below the structure.
【００１０】請求項２記載の本発明によれば、前記作用
に加えて、ロッドの先端の回転ヘッドを回転させる手段
として、水力モータを用いることで、ノズルから噴出す
るジェット水等を利用してヘッドを回転でき、回転動力
を容易に得られる。According to the second aspect of the present invention, in addition to the above-described operation, a hydraulic motor is used as a means for rotating the rotary head at the tip of the rod, so that jet water or the like jetted from a nozzle is used. The head can be rotated, and rotational power can be easily obtained.
【００１１】[0011]
【発明の実施の形態】以下、図面について本発明の実施
の形態を詳細に説明する。図１は本発明の改良壁の施工
方法の実施形態を示す正面図、図２は同上側面図、図３
は本発明方法で使用する掘削機の要部の縦断正面図で、
本発明で使用する掘削機から説明する。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of the improved wall construction method of the present invention, FIG.
Is a longitudinal sectional front view of the main part of the excavator used in the method of the present invention,
The excavator used in the present invention will be described first.
【００１２】掘削機１は、可撓性のロッド２の回転ヘッ
ド３の内部に該ヘッド３を回転させる手段として水力モ
ータ４を内蔵するもので、水力モータ４は筒体状の本体
の外周面に螺旋溝４ａを形成してある。ロッド２は掘削
兼ジェットパイプとなるものである。The excavator 1 has a built-in hydraulic motor 4 as a means for rotating the rotary head 3 inside a rotary head 3 of a flexible rod 2, and the hydraulic motor 4 is an outer peripheral surface of a cylindrical main body. Is formed with a spiral groove 4a. The rod 2 serves as an excavation and jet pipe.
【００１３】水力モータ４の先端にはノズル５を一体に
形成し、ノズル５の噴出口５ａをロット２の軸方向すな
わち回転軸と直行する方向に噴射するように向けて対向
位置に設け、該噴出口５ａとロッド２とに連通するとと
もに螺旋溝４ａに開口する導水口６をロッド２の回転ヘ
ッド３と水力モータ４の内部に形成した。なお、図示は
省略するが、セメントミルク等の固結材をノズル５に送
る管も設け、多重管構造とする。A nozzle 5 is integrally formed at the tip of the hydraulic motor 4, and an ejection port 5a of the nozzle 5 is provided at an opposed position so as to be ejected in the axial direction of the lot 2, that is, in a direction perpendicular to the rotation axis. A water introduction port 6 communicating with the jet port 5a and the rod 2 and opening to the spiral groove 4a is formed inside the rotary head 3 of the rod 2 and the hydraulic motor 4. Although not shown, a pipe for feeding a consolidation material such as cement milk to the nozzle 5 is also provided to form a multi-pipe structure.
【００１４】そして、ノズル５の先端に該ノズル５と一
体的に回転する掘削ビット７を設ける。At the tip of the nozzle 5, a cutting bit 7 which rotates integrally with the nozzle 5 is provided.
【００１５】かかる掘削機１を使用して改良壁を造成す
る方法を説明する。図１のように構造物８の下方に改良
壁を造成するには、施工手順として先ず図４に示すよう
に構造物８の側方の地上から鋼管杭９を所定の深度まで
鉛直方向に打設し、あるいはケーシングを旋回圧入した
後、図５のように鋼管杭９の内部を掘削し、掘削が終了
すれば杭内に導管10を挿入して鋼管杭９を引き抜き（図
６参照）、立ての導口を施工する。導管10は下端の一方
の内側部をテーパー部10ａに形成しておく。A method of forming an improved wall using the excavator 1 will be described. In order to construct an improved wall below the structure 8 as shown in FIG. 1, as a construction procedure, first, as shown in FIG. 4, a steel pipe pile 9 is vertically struck from the ground on the side of the structure 8 to a predetermined depth. After the installation or the casing is swirled and press-fitted, the inside of the steel pipe pile 9 is excavated as shown in FIG. Install a vertical entrance. One inner side of the lower end of the conduit 10 is formed as a tapered portion 10a.
【００１６】こうして施工した導管10内に図７に示すよ
うに掘削機１を差し込めば、先端部３は導管10の下端か
らテーパー部10ａにそって水平方向に方向転換する。こ
の場合、ロッド２は可撓性であるから鉛直方向から水平
方向に自由に曲がる。When the excavator 1 is inserted into the thus constructed conduit 10 as shown in FIG. 7, the tip portion 3 is turned in the horizontal direction from the lower end of the conduit 10 along the tapered portion 10a. In this case, since the rod 2 is flexible, it can freely bend from the vertical direction to the horizontal direction.
【００１７】この状態から水力モータ４の螺旋溝４ａに
ジェット水を圧送してこれを回転することで掘削機１を
作動し、先端の掘削ビット７を回転させて水平方向に削
孔する。このとき、ロッド２は回転せず、回転ヘッド３
のみが回転する。In this state, the jet water is pressure-fed into the spiral groove 4a of the hydraulic motor 4 and the jet water is rotated to operate the excavator 1, and the drill bit 7 at the tip is rotated to drill a hole in the horizontal direction. At this time, the rod 2 does not rotate, and the rotating head 3
Only rotate.
【００１８】所定長、水平掘削したならば、コラムジェ
ットグラウト工法などによりジェット水とセメントミル
クを導水口６と管からそれぞれノズル５に送る。この状
態でノズル５は水力モータ４と一体に形成してあるから
水力モータ４とともに鉛直方向に回転する。After horizontal drilling for a predetermined length, jet water and cement milk are sent to the nozzle 5 from the water inlet 6 and the pipe, respectively, by a column jet grouting method or the like. In this state, since the nozzle 5 is formed integrally with the hydraulic motor 4, it rotates with the hydraulic motor 4 in the vertical direction.
【００１９】よってノズル５の先端の噴出口５ａは円形
の軌跡を描きながら回転し、ここから噴出するジェット
水と同時に別の管端の開口から噴出するセメントミルク
は円形状に放出される。かかる噴射を同時にロッド２を
引き抜きながら行えば、図１、図２に示すような水平柱
状の改良柱11が造成される。Therefore, the jet port 5a at the tip of the nozzle 5 rotates while drawing a circular trajectory, and simultaneously with the jet water jetting from this, the cement milk jetting from another pipe end opening is discharged in a circular shape. If such injection is performed while simultaneously pulling out the rod 2, an improved horizontal column 11 as shown in FIGS. 1 and 2 is formed.
【００２０】このような水平柱状の改良柱11を導管10を
引き揚げながら、あるいは横移動させて前記と同様に施
工し、導管10にそって連続して順次造成することで、水
平、鉛直、斜めの各方向に任意に改良壁12を造成する。The horizontal column-shaped improved column 11 is constructed in the same manner as described above while pulling up or laterally moving the conduit 10, and is successively formed along the conduit 10 so as to be horizontal, vertical, diagonal. The improvement wall 12 is arbitrarily formed in each of the directions.
【００２１】なお、立ての導口はＣＤ（ケーシングドラ
イブ）掘削機での施工も可能であり、あらゆる地層にお
いて施工できるものである。In addition, the erecting port can be constructed by a CD (casing drive) excavator, and can be constructed in any stratum.
【００２２】[0022]
【発明の効果】以上述べたように本発明の改良壁の施工
方法は、鉛直に造成した導口から何段階かに分けて水平
削孔して水平改良柱を造成し、これを接続するだけで改
良壁を造成できるから、一回の削孔で長い範囲に改良壁
を造成でき、施工能率が向上し、また、鉛直に掘削した
後にここから水平に削孔するから、ケーソンなどの既存
の構造物の下部にも容易に施工できるものである。As described above, the method for constructing an improved wall according to the present invention is as follows: a horizontal improvement column is formed by dividing a vertical opening from a plurality of stages into horizontal holes to form a horizontal improvement column and connecting the columns. Because it is possible to create an improved wall with a single drilling, it is possible to create an improved wall over a long area, improving construction efficiency.Because drilling vertically and then drilling horizontally from here, caisson and other existing It can be easily installed under the structure.
【図１】本発明の改良壁の施工方法の実施形態を示す正
面図である。FIG. 1 is a front view showing an embodiment of a method for constructing an improved wall according to the present invention.
【図２】本発明の改良壁の施工方法の実施形態を示す側
面図である。FIG. 2 is a side view showing an embodiment of the improved wall construction method of the present invention.
【図３】本発明の改良壁の施工方法で使用する掘削機の
要部の縦断正面図である。FIG. 3 is a longitudinal sectional front view of a main part of an excavator used in the improved wall construction method of the present invention.
【図４】本発明の改良壁の施工方法の第１工程を示す縦
断正面図である。FIG. 4 is a longitudinal sectional front view showing a first step of a method for constructing an improved wall according to the present invention.
【図５】本発明の改良壁の施工方法の第２工程を示す縦
断正面図である。FIG. 5 is a vertical sectional front view showing a second step of the method for constructing an improved wall according to the present invention.
【図６】本発明の改良壁の施工方法の第３工程を示す縦
断正面図である。FIG. 6 is a longitudinal sectional front view showing a third step of the method for constructing an improved wall according to the present invention.
【図７】本発明の改良壁の施工方法の第４工程を示す縦
断正面図である。FIG. 7 is a vertical sectional front view showing a fourth step of the method for constructing an improved wall according to the present invention.
１…掘削機 ２…ロッド ３…回転ヘッド ４…水力モータ ４ａ…螺旋溝 ５…ノズル ５ａ…噴出口 ６…導水口 ７…掘削ビット ８…構造物 ９…鋼管杭 10…導管 10ａ…テーパー部 11…改良柱 12…改良壁 DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Rod 3 ... Rotating head 4 ... Hydraulic motor 4a ... Spiral groove 5 ... Nozzle 5a ... Spout port 6 ... Water introduction port 7 ... Drilling bit 8 ... Structure 9 ... Steel pipe pile 10 ... Pipe 10a ... Tapered part 11 … Improved pillars 12… Improved walls
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 3/12 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) E02D 3/12
Claims (2)
削ビットと、回転ヘッドの回転方向と同方向に回転し噴
射方向が回転軸と直行する方向のノズルとを設けて掘削
機を構成し、該掘削機のロッドを鉛直に施工した導口内
に挿入し、回転ヘッドを回転して掘削ビットで水平方向
に削孔し、所定長を削孔後、ロッドを引き抜きながらノ
ズルを回転し、該ノズルからセメントミルク等の固結材
とジェット水を噴射して水平柱状に改良柱を造成し、こ
の改良柱を並べて水平、垂直、斜めの方向に改良壁を造
成することを特徴とする改良壁の施工方法。An excavator is provided by providing a rotary head at the tip of a flexible rod with a drill bit and a nozzle which rotates in the same direction as the rotational direction of the rotary head and whose injection direction is perpendicular to the rotary axis. Then, insert the rod of the excavator into the vertically constructed conduit, rotate the rotary head to drill a hole in the horizontal direction with a drill bit, drill a predetermined length, then rotate the nozzle while pulling out the rod, An improvement characterized by forming an improved column in the form of a horizontal column by spraying a consolidating material such as cement milk and jet water from the nozzle, and arranging the improved column to form an improved wall in horizontal, vertical and oblique directions. Wall construction method.
モータの回転力により回転ヘッドを回転させる請求項１
記載の改良壁の施工方法。2. The rotary head is provided with a hydraulic motor, and the rotary head is rotated by the rotational force of the hydraulic motor.
Construction method of the described improved wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08041300A JP3125033B2 (en) | 1996-02-28 | 1996-02-28 | Construction method of improved wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08041300A JP3125033B2 (en) | 1996-02-28 | 1996-02-28 | Construction method of improved wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09228356A JPH09228356A (en) | 1997-09-02 |
| JP3125033B2 true JP3125033B2 (en) | 2001-01-15 |
Family
ID=12604627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08041300A Expired - Fee Related JP3125033B2 (en) | 1996-02-28 | 1996-02-28 | Construction method of improved wall |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3125033B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7458537B2 (en) | 2022-08-19 | 2024-03-29 | 中鉄三局集団有限公司 | Construction equipment and method for reinforcing soft ground |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4600897B2 (en) * | 2000-05-16 | 2010-12-22 | ケミカルグラウト株式会社 | Chemical injection method |
| JP6677619B2 (en) * | 2016-10-06 | 2020-04-08 | 鹿島建設株式会社 | Boring and chemical injection method |
-
1996
- 1996-02-28 JP JP08041300A patent/JP3125033B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7458537B2 (en) | 2022-08-19 | 2024-03-29 | 中鉄三局集団有限公司 | Construction equipment and method for reinforcing soft ground |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09228356A (en) | 1997-09-02 |
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