JP2014031634A - Construction method of easily removable soil cement column - Google Patents

Construction method of easily removable soil cement column Download PDF

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Publication number
JP2014031634A
JP2014031634A JP2012172070A JP2012172070A JP2014031634A JP 2014031634 A JP2014031634 A JP 2014031634A JP 2012172070 A JP2012172070 A JP 2012172070A JP 2012172070 A JP2012172070 A JP 2012172070A JP 2014031634 A JP2014031634 A JP 2014031634A
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support
hollow cylinder
tip
soil cement
cement column
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JP5730826B2 (en
Inventor
Masakazu Fujita
雅一 藤田
Hironobu Nakamura
弘伸 中村
Yusuke Jinguji
悠介 神宮司
Sen Higuchi
遷 樋口
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HIGUCHI GIKOU KK
HOKOKU ENGINEERING CO Ltd
SEKKEISHITSU SOIL KK
Soil Design Co Ltd
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HIGUCHI GIKOU KK
HOKOKU ENGINEERING CO Ltd
SEKKEISHITSU SOIL KK
Soil Design Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method capable of collecting a cover in a distal end of a stirring rod.SOLUTION: According to the method, a stirring rod in which a stirring blade is mounted around a hollow tube is used. While discharging a solidification material, the stirring rod is rotated and intruded into the ground, and a solid cement column stirring sediment and the solidification material is formed around the hollow tube. A steel pipe of which the end portion is opened is then inserted into the hollow tube as a support and guide pipe, and the stirring rod is pulled up while being rotated in the state where the support and guide pipe filled with the solidification material is left under the ground. In a distal end of the hollow tube, a cover and tip blade 7 which is axially stopped by a pin 21d is mounted to be freely rotatable around the pin 21d.

Description

本発明はその用途が終了した後には、その撤去が容易なソイルセメントコラムの構築方法に関するものである。   The present invention relates to a method for constructing a soil cement column that can be easily removed after its use is completed.

撤去が容易なソイルセメントコラムを構築する方法として、特許文献1記載の方法が知られている。
この方法の構築工程を説明すると次の通りである。
1)中空筒の周囲に攪拌翼を取り付けた攪拌ロッドを使用する。
2)固化材を吐出しながら攪拌ロッドを地中に回転させて貫入する。
3)中空筒の周囲に土砂と固化材を攪拌したソイルセメントコラムを形成する。
4)その後に中空筒の内部に、支持兼ガイド管として端部を開放した鋼管を挿入する。
5)そして、内部に固化材を充填した支持兼ガイド管を地中に残して攪拌ロッドを回転しながら引き上げて、ソイルセメントコラムを構築する。
As a method for constructing a soil cement column that can be easily removed, a method described in Patent Document 1 is known.
The construction process of this method will be described as follows.
1) Use a stirring rod with a stirring blade around the hollow cylinder.
2) Rotate the stirring rod into the ground while discharging the solidified material and penetrate.
3) A soil cement column in which earth and sand and a solidified material are stirred is formed around the hollow cylinder.
4) Thereafter, a steel pipe having an open end is inserted into the hollow cylinder as a support and guide pipe.
5) Then, the support and guide tube filled with the solidifying material is left in the ground, and the stirring rod is pulled up while rotating to construct a soil cement column.

上記の方法で構築したソイルセメントコラムは、次のような順序で容易に解体、撤去することができる。
1)切削ビット付きの中空オーガーを使用する。
2)前記の支持兼ガイド管をガイドとして、その外周に中空オーガーを嵌合して、ソイルセメントコラム内に回転させて貫入して粉砕する。
3)ソイルセメントコラムの先端まで粉砕したら、中空オーガーの内部から支持兼ガイド管を引き上げる。
4)中空オーガーを通して埋め戻し土を充填しながら中空オーガーを引き上げて、ソイルセメントコラムを埋め戻し土に置き換える。
The soil cement column constructed by the above method can be easily disassembled and removed in the following order.
1) Use a hollow auger with a cutting bit.
2) Using the support / guide tube as a guide, a hollow auger is fitted to the outer periphery of the tube and rotated into a soil cement column to be crushed.
3) After grinding to the tip of the soil cement column, lift the support and guide tube from the inside of the hollow auger.
4) Pull up the hollow auger while filling the backfill through the hollow auger and replace the soil cement column with backfill.

特開2012−21310号公報。Unexamined-Japanese-Patent No. 2012-21310.

前記した従来の撤去が容易なソイルセメントコラムの構築方法にあっては、次のような問題点があることが分かった。
<1> 支持兼ガイド管4の先端が中空筒21の先端の位置に達するまで、中空筒21の内部に挿入する。そして挿入が完了したら、その支持兼ガイド管4を地中に残して攪拌ロッド2を引き上げる方法である。
<2> このように支持兼ガイド管を中空筒21に挿入するから、中空筒の先端の蓋25は地中に残しておかざるを得ない。
<3> その結果、ソイルセメントコラムの構築1本ごとに、先端の蓋25を地中に残してゆく工法であり、その点では不経済なものであった。
It has been found that the conventional method for constructing a soil cement column that can be easily removed has the following problems.
<1> Insert into the hollow cylinder 21 until the tip of the support / guide tube 4 reaches the position of the tip of the hollow cylinder 21. Then, when the insertion is completed, the stirring rod 2 is pulled up with the support / guide tube 4 remaining in the ground.
<2> Since the support / guide tube is inserted into the hollow cylinder 21 as described above, the lid 25 at the tip of the hollow cylinder must be left in the ground.
<3> As a result, for each construction of the soil cement column, this is a construction method in which the lid 25 at the tip is left in the ground, which is uneconomical.

上記のような課題を解決する本発明の撤去が容易なソイルセメントコラムの構築方法は、中空筒の周囲に攪拌翼を取り付けた攪拌ロッドを使用し、固化材を吐出しながら攪拌ロッドを地中に回転させて貫入し、中空筒の周囲に土砂と固化材を攪拌したソイルセメントコラムを形成し、その後に中空筒の内部に、支持兼ガイド管として端部を開放した鋼管を挿入し、内部に固化材を充填した支持兼ガイド管を地中に残して攪拌ロッドを回転しながら引き上げる方法であって、前記中空筒の先端には、ピンで軸止めした蓋兼先端刃7を、ピンを中心に回転自在に取り付け、前記支持兼ガイド管を中空筒内に挿入する過程で、支持兼ガイド管の先端によって前記蓋兼先端刃7を押し下げることで、蓋兼先端刃7をピンを中心に回転させて前記中空筒の先端部を開放し、支持兼ガイド管の先端をソイルセメントコラムの底部まで到達できるように構成したことを特徴とするものである。   The method for constructing a soil cement column according to the present invention that solves the above-described problems is an easy-to-remove method using a stirring rod with a stirring blade attached around a hollow cylinder. To form a soil cement column with sand and solidified material agitated around the hollow cylinder, and then insert a steel pipe with an open end as a support and guide pipe into the hollow cylinder. In this method, the support and guide tube filled with the solidified material is left in the ground and the stirring rod is rotated and pulled up, and a lid and tip blade 7 fixed with a pin is attached to the tip of the hollow cylinder. In the process of inserting the support and guide tube into the hollow cylinder, the cover and tip blade 7 is pushed down by the tip of the support and guide tube in the process of inserting the support and guide tube into the hollow cylinder. Rotate the hollow cylinder It opens the tip and is characterized by being configured to be able to reach the distal end of the support and the guide tube to the bottom of the soil cement column.

本発明の撤去が容易なソイルセメントコラムの構築方法は以上説明したようになるから次のような効果を得ることができる。
<1>撹拌ロッドの中央に支持杭兼ガイド管が存在していても、蓋兼先端刃7を回収することができる。
<2>コラムごとに先端刃を地中に残す不経済な工法が、蓋兼先端刃7を回収することによって経済的になった。
Since the construction method of the soil cement column which can be easily removed according to the present invention is as described above, the following effects can be obtained.
<1> Even if the support pile / guide tube exists in the center of the stirring rod, the lid / tip blade 7 can be recovered.
<2> An uneconomical construction method that leaves the tip blade in the ground for each column has become economical by collecting the lid / tip blade 7.

本発明のソイルセメントコラムの構築方法に使用する攪拌ロッドの説明図。Explanatory drawing of the stirring rod used for the construction method of the soil cement column of this invention. 中空筒の先端と蓋兼先端刃7との説明図。Explanatory drawing of the front-end | tip of a hollow cylinder, and the lid | cover / tip blade 7. FIG. 蓋兼先端刃7の実施例の説明図。Explanatory drawing of the Example of the lid | cover / tip blade 7. FIG. 中空筒と蓋兼先端刃7の取り付け状態の説明図。Explanatory drawing of the attachment state of a hollow cylinder and the lid | cover / tip blade 7. FIG. 蓋兼先端刃7の薄板の変形の説明図。Explanatory drawing of a deformation | transformation of the thin plate of the lid | cover / tip blade 7. FIG. ソイルセメントコラムの構築状態の説明図。Explanatory drawing of the construction state of a soil cement column. ソイルセメントコラムの解体状態の説明図。Explanatory drawing of the disassembly state of a soil cement column. 解体後の空洞を埋め戻す状態の説明図。Explanatory drawing of the state which refills the cavity after dismantling. ソイルセメントコラムの説明図。Explanatory drawing of a soil cement column.

以下図面を参照にしながら本発明の好適な実施の形態を詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

<1> ソイルセメントコラムの構築部材。
まず本発明のソイルセメントコラムを構築する部材について説明する。
<1> Construction material for soil cement column.
First, members for constructing the soil cement column of the present invention will be described.

<2>攪拌ロッドの形状。
本発明で構築する対象は、中心の鋼管(支持兼ガイド管)4の内部および外周には高強度の固化材3が充填してあってかつその周囲には円筒状の攪拌域11を備えたソイルセメントコラム1である。(図9)
このソイルセメントコラム1を構築する方法では、中空筒21の周囲に攪拌翼22を取り付けた攪拌ロッド2を使用する。(図1)
さらに詳細に説明すれば、筒状の中空筒21の先端には、中空筒21の中心軸と直交する方向に、一定長さの腕23を突設し、その腕23に地盤を切削するための複数のビット24を固定してある。
前記したように筒状の中空筒21の周囲には、中空筒21の中心軸と直交する方向に、一定長さの攪拌翼22を突設してあるから、攪拌翼22の先端の描く軌跡が、ソイルセメントコラム1の外径となる。
中空筒21の内部は貫通しており、上端からセメントスラリーのような固化材3を供給すれば、中空筒21の下端から吐出することができる。
中空筒21の内径は、後述する支持兼ガイド管4を収納できる寸法に構成する。
<2> The shape of the stirring rod.
The object to be constructed according to the present invention is that a central steel pipe (support / guide pipe) 4 is filled with a high-strength solidified material 3 on the inside and outer periphery thereof, and is provided with a cylindrical stirring zone 11 around it. This is a soil cement column 1. (Fig. 9)
In the method for constructing the soil cement column 1, the stirring rod 2 in which the stirring blade 22 is attached around the hollow cylinder 21 is used. (Figure 1)
More specifically, an arm 23 having a predetermined length is projected from the end of the cylindrical hollow cylinder 21 in a direction perpendicular to the central axis of the hollow cylinder 21, and the ground is cut on the arm 23. The plurality of bits 24 are fixed.
As described above, the stirring blade 22 having a fixed length is provided around the cylindrical hollow tube 21 in a direction orthogonal to the central axis of the hollow tube 21. Is the outer diameter of the soil cement column 1.
The inside of the hollow cylinder 21 penetrates, and if the solidifying material 3 such as cement slurry is supplied from the upper end, the hollow cylinder 21 can be discharged from the lower end.
The inner diameter of the hollow cylinder 21 is configured to be a size that can accommodate a support / guide tube 4 described later.

<3>蓋兼先端刃。(図2)
この中空筒21の下端には、蓋兼先端刃7を取り付ける。
この取付け位置は、ビット24の回転による撹拌の影響を避けることができるよう、中空筒21の下端面より下方の位置である。
この蓋兼先端刃7は、後述する支持兼ガイド管4によって下向きの押圧力を付与することで、中空筒21から分離はしないが、回転して開放が可能な部材である。
そのために例えば図に示すように、中空筒の先端に蓋兼先端刃7の一部をピン21dを介して軸止めする。
したがって蓋兼先端刃7は、中空筒から完全に分離することなく、離脱はするが、ピン21dを中心に回転自在である。
この蓋兼先端刃7に吐出口を開口して、固化材3の吐出が可能であるように構成することができ、中空筒21の周辺にも吐出口を開口することもできる。
<3> Lid and tip blade. (Figure 2)
A lid / tip blade 7 is attached to the lower end of the hollow cylinder 21.
This attachment position is a position below the lower end surface of the hollow cylinder 21 so that the influence of agitation due to the rotation of the bit 24 can be avoided.
The lid / tip blade 7 is a member that can be rotated and opened, although it is not separated from the hollow cylinder 21 by applying a downward pressing force by a support / guide tube 4 described later.
For this purpose, for example, as shown in the figure, a part of the lid / tip blade 7 is fixed to the tip of the hollow cylinder via a pin 21d.
Accordingly, the lid / tip blade 7 is detached from the hollow cylinder without being completely separated, but is rotatable around the pin 21d.
A discharge port can be opened in the lid / tip blade 7 so that the solidified material 3 can be discharged, and a discharge port can also be opened around the hollow cylinder 21.

<4>蓋兼先端刃の厚さ。(図3)
蓋兼先端刃7は、側面視が、下に頂点を有し、上に水平片を有するほぼ三角形の板体である。
その下の頂点側の斜辺が掘削のための刃となる。
この蓋兼先端刃7は3枚の鋼板を重ねて構成する。
すなわち両側の薄板71と、薄板71で挟んだ厚板72である。
両側を薄板71で構成する理由は、後述するように蓋兼先端刃7の自由端を中空筒21の縦溝21a内に挿入して加圧した場合に、薄板71を容易に外側に変形させるためである。
そのために厚板72では、その自由端部に切欠き21bを設ける。
その切欠き21b部では両側の薄板71だけが直立しているので、薄板21bの間の空間を変形空間75として構成して薄板71の変形を容易とする。
この3枚の板の上辺の上には、3枚の板と直交する状態で、鋼製の円盤73を取りつける。
この円盤73の外径は、中空筒21の内径よりやや小径である。
この円盤73の機能は中空筒21の下端の開放口からの土砂などの侵入を防止するためのものである。
<4> The thickness of the lid / tip blade. (Figure 3)
The lid / tip blade 7 is a substantially triangular plate body having a vertex at the bottom and a horizontal piece on the top as viewed from the side.
The hypotenuse below the apex is the blade for excavation.
The lid / tip blade 7 is formed by stacking three steel plates.
That is, the thin plate 71 on both sides and the thick plate 72 sandwiched between the thin plates 71.
The reason for configuring the both sides with the thin plate 71 is that the thin plate 71 is easily deformed outward when the free end of the lid / tip blade 7 is inserted into the longitudinal groove 21a of the hollow cylinder 21 and pressed as will be described later. Because.
Therefore, the thick plate 72 is provided with a notch 21b at its free end.
Since only the thin plates 71 on both sides stand upright in the notch 21b, the space between the thin plates 21b is configured as a deformation space 75 to facilitate the deformation of the thin plate 71.
A steel disk 73 is attached on the upper side of the three plates in a state orthogonal to the three plates.
The outer diameter of the disk 73 is slightly smaller than the inner diameter of the hollow cylinder 21.
The function of the disk 73 is to prevent intrusion of earth and sand from the opening at the lower end of the hollow cylinder 21.

<5>中空筒との一体化。(図4)
上記したように、中空筒21の下端の一部に蓋兼先端刃7をピン21dで回転自在に取り付けてある。
ピン21dを中心に回転した蓋兼先端刃7の他端が中空筒に当る位置には、中空筒の中心軸と平行方向に、施工機械の回転力を蓋兼先端刃7に伝達するための縦溝21aを開口する。
この縦溝21aの上端には上向きに拡大した拡大穴21bを形成する。
この拡大穴21bに挿入した蓋兼先端刃7の薄板71が外側に変形すると、蓋兼先端刃7の自由端を中空筒の下端に一体化することになる。(図5)
しかし蓋兼先端刃7の一体化は薄板71の変形による程度なので、円盤73を上部から強い外力で押し下げると容易に中空筒21の端部から離脱する。
その結果、蓋兼先端刃7はピン21dを中心に下向きに回転し、ピン21dのみによって中空筒21に取り付けた状態となる。
<5> Integration with a hollow cylinder. (Fig. 4)
As described above, the lid / tip blade 7 is rotatably attached to a part of the lower end of the hollow cylinder 21 by the pin 21d.
For transmitting the rotational force of the construction machine to the lid / tip blade 7 in a direction parallel to the central axis of the hollow cylinder at a position where the other end of the lid / tip blade 7 rotated around the pin 21d hits the hollow cylinder. The vertical groove 21a is opened.
An enlarged hole 21b that is enlarged upward is formed at the upper end of the vertical groove 21a.
When the thin plate 71 of the lid / tip blade 7 inserted into the enlarged hole 21b is deformed outward, the free end of the lid / tip blade 7 is integrated with the lower end of the hollow cylinder. (Fig. 5)
However, since the integration of the lid / tip blade 7 is only due to the deformation of the thin plate 71, it is easily detached from the end of the hollow cylinder 21 when the disk 73 is pushed down from above with a strong external force.
As a result, the lid / tip blade 7 rotates downward about the pin 21d and is attached to the hollow cylinder 21 only by the pin 21d.

<6>杭の構築工程。
次に本発明のソイルセメントコラムの構築工程について説明する。
<6> Pile construction process.
Next, the construction process of the soil cement column of the present invention will be described.

<7>構築するコラム。
本発明の方法で構築するソイルセメントコラム1は図9に示すような構造を備えている。
すなわちコラムの中心には後述する支持兼ガイド管4が位置しており、その内部には固化材3を充填してあり、その外周は固化材3と土砂とを撹拌した撹拌域11を形成したものである。
<7> Column to build.
The soil cement column 1 constructed by the method of the present invention has a structure as shown in FIG.
That is, a support and guide tube 4 to be described later is located at the center of the column, and the inside thereof is filled with the solidifying material 3, and the outer periphery forms a stirring zone 11 in which the solidifying material 3 and the earth and sand are stirred. Is.

<8>攪拌ロッドの貫入。(図1)
まず上記した攪拌ロッド2を地表面に鉛直に設置する。
そして攪拌ロッド2の上端から固化材3を注入しつつ、回転を与える。
こうして先端から固化材3を吐出しながら攪拌ロッド2を地中に回転させて攪拌翼22の先端の描く軌跡の範囲内に土砂と固化材3を攪拌した攪拌域11を形成しながら貫入して行く。
その際に攪拌ロッド2の中空筒21の下端の蓋兼先端刃7は、ピン21dと薄板71の変形によって中空筒21の下端を閉塞する状態で位置している。
<8> Penetration of the stirring rod. (Figure 1)
First, the stirring rod 2 described above is installed vertically on the ground surface.
And rotation is given, inject | pouring the solidification material 3 from the upper end of the stirring rod 2. FIG.
In this way, the agitation rod 2 is rotated into the ground while discharging the solidified material 3 from the tip, and penetrates while forming the agitation zone 11 where the earth and sand and the solidified material 3 are agitated within the range drawn by the tip of the agitating blade 22. go.
At this time, the lid / tip blade 7 at the lower end of the hollow cylinder 21 of the stirring rod 2 is positioned in a state in which the lower end of the hollow cylinder 21 is closed by deformation of the pin 21 d and the thin plate 71.

<9>攪拌域の形成。
攪拌ロッド2の回転によって攪拌翼22が中空筒21の周囲の土砂と、先端や周囲から吐出した固化材3を攪拌する。
このような攪拌によって、土砂と固化材3を攪拌できるから、中空筒21の周囲には、攪拌翼22の先端の軌跡を外径とした円柱状の攪拌域11を形成することができる。
<9> Formation of a stirring zone.
With the rotation of the stirring rod 2, the stirring blade 22 stirs the earth and sand around the hollow cylinder 21 and the solidified material 3 discharged from the tip or the periphery.
Since the earth and sand and the solidified material 3 can be agitated by such agitation, a cylindrical agitation zone 11 having an outer diameter of the locus of the tip of the agitation blade 22 can be formed around the hollow cylinder 21.

<10>鋼管の挿入。
攪拌ロッド2の中心の中空筒21の内部にも固化材3は充填してある。
そこで攪拌ロッド2が計画深さまで到達したら回転を停止し、中空筒21の地上側を開放し、その内部に鋼管4を挿入する。
この鋼管4が、支持兼ガイド管4としての機能を果たすものである。
中空筒21の内部の固化材3はまだ固化していないので、支持兼ガイド管4としての鋼管4を容易に挿入することができる。
支持兼ガイド管4は、その端部を開口した管体なので、支持兼ガイド管4は挿入にしたがってその内部にも固化材3が充填される。
<10> Insertion of steel pipe.
The solidified material 3 is also filled in the hollow cylinder 21 at the center of the stirring rod 2.
Therefore, when the stirring rod 2 reaches the planned depth, the rotation is stopped, the ground side of the hollow cylinder 21 is opened, and the steel pipe 4 is inserted therein.
The steel pipe 4 serves as a support / guide pipe 4.
Since the solidified material 3 inside the hollow cylinder 21 is not yet solidified, the steel pipe 4 as the support and guide pipe 4 can be easily inserted.
Since the support / guide tube 4 is a tubular body having an open end, the support / guide tube 4 is filled with the solidified material 3 as it is inserted.

<11>攪拌ロッドの引き上げ。(図6)
支持兼ガイド管4の先端が中空筒21の先端の位置に達するまで、中空筒21の内部に挿入する。
挿入が完了したら、蓋兼先端刃7を開放しやすくするために中空筒21を5〜10cm程度引き上げる。
<11> Pull up the stirring rod. (Fig. 6)
The support / guide tube 4 is inserted into the hollow tube 21 until the tip of the support / guide tube 4 reaches the position of the tip of the hollow tube 21.
When the insertion is completed, the hollow cylinder 21 is pulled up by about 5 to 10 cm so that the lid / tip blade 7 can be easily opened.

<12>蓋兼先端刃の回転。
中空筒21の先端は、蓋兼先端刃7によって蓋をした状態である。
この蓋兼先端刃7の円盤73の上には、支持兼ガイド管4の下端が位置しているから、支持兼ガイド管4の頭部より、同じ直径のパイプなどで地上から押し下げることによって下向きの力を作用させる。
その結果、蓋兼先端刃7はピン21dを中心に下向きに回転して、中空筒21の下から離脱し、中空筒21の下端を開放する。
しかし蓋兼先端刃7はピン21dによって中空筒21に固定してある。
したがって中空筒21の引き上げに伴って、それと一体として引き上げることができ、中空筒21とともに回収することができる。
攪拌ロッド2の引き上げに際しては、攪拌ロッド2を回転しながら引き上げて行くので周囲の土砂はさらに固化材3との攪拌が促進されて均一で良質な攪拌域11を構築することができる。
また撹拌域11内の支持兼ガイド管4の外周には固化材3を残置することができる。
こうして、中心の鋼管(支持兼ガイド管)4の内部および外周には高強度の固化材3が充填してあってかつその周囲には円筒状の攪拌域11を備えたソイルセメントコラム1が完成する。
<12> Rotation of lid and tip blade.
The tip of the hollow cylinder 21 is in a state of being covered with a lid and tip blade 7.
Since the lower end of the support / guide tube 4 is positioned on the disk 73 of the lid / tip blade 7, the lower portion of the support / guide tube 4 is pushed downward from the ground with a pipe having the same diameter from the head of the support / guide tube 4. Apply the power of.
As a result, the lid / tip blade 7 rotates downward about the pin 21 d, is detached from the bottom of the hollow cylinder 21, and opens the lower end of the hollow cylinder 21.
However, the lid / tip blade 7 is fixed to the hollow cylinder 21 by the pin 21d.
Therefore, as the hollow cylinder 21 is pulled up, it can be pulled up integrally therewith and can be collected together with the hollow cylinder 21.
When the stirring rod 2 is pulled up, the stirring rod 2 is pulled up while rotating, so that the surrounding earth and sand are further promoted to be stirred with the solidifying material 3 and a uniform and high-quality stirring zone 11 can be constructed.
Further, the solidifying material 3 can be left on the outer periphery of the support / guide tube 4 in the stirring zone 11.
In this way, a soil cement column 1 in which a high strength solidifying material 3 is filled in and around the center steel pipe (support / guide pipe) 4 and a cylindrical stirring zone 11 is provided around the solid cement material 1 is completed. To do.

<13>ソイルセメントコラムの撤去方法。
次に上記の工程で構築したソイルセメントコラム1の撤去方法について説明する。
<13> A method for removing the soil cement column.
Next, the removal method of the soil cement column 1 constructed | assembled by said process is demonstrated.

<14>中空オーガー。(図7)
杭の用途が終了した後の撤去に際しては、ソイルセメントコラム1を破砕して地上に押し出して排除する必要がある。
そのために中心の中空管51の外周に螺旋翼52を取り付けた中空オーガー5を使用する。
この中空オーガー5の先端にはソイルセメントコラム1を切削するための切削ビット53を設けてある。
中空オーガー5の先端の切削ビット53は、中空管51の中心軸と直交する方向に突出させた腕に掘削刃を固定したものである。
この腕の先端の回転軌跡が、構築したソイルセメントコラム1の外径にほぼ等しい。
<14> Hollow auger. (Fig. 7)
When removing the pile after the use is finished, it is necessary to crush the soil cement column 1 and push it out to the ground to eliminate it.
For this purpose, a hollow auger 5 having a spiral blade 52 attached to the outer periphery of the central hollow tube 51 is used.
A cutting bit 53 for cutting the soil cement column 1 is provided at the tip of the hollow auger 5.
The cutting bit 53 at the tip of the hollow auger 5 is obtained by fixing a drilling blade to an arm that protrudes in a direction perpendicular to the central axis of the hollow tube 51.
The rotation trajectory of the tip of the arm is almost equal to the outer diameter of the constructed soil cement column 1.

<15>支持兼ガイド管の挿入。
前記の工程で構築したソイルセメントコラム1には支持兼ガイド管4が残っている。
この支持兼ガイド管4を、中空オーガー5の中空管51内に挿入する状態で切り下げを開始する。
中空オーガー5の中空管51の内径は、支持兼ガイド管4の外径よりも多少大きい寸法に構成してあるので、中空管51を支持兼ガイド管4の外周に挿入して回転することができる。
<15> Inserting a support / guide tube.
The support and guide tube 4 remains in the soil cement column 1 constructed in the above-described process.
The support and guide tube 4 is started to be cut down while being inserted into the hollow tube 51 of the hollow auger 5.
Since the inner diameter of the hollow tube 51 of the hollow auger 5 is slightly larger than the outer diameter of the support / guide tube 4, the hollow tube 51 is inserted into the outer periphery of the support / guide tube 4 and rotated. be able to.

<16>ソイルセメントコラムの粉砕。(図7)
支持兼ガイド管4の外周に中空オーガー5を挿入して回転を与えると、中空オーガー5は中心の支持兼ガイド管4をガイドとして正確に地中に侵入することになる。
一般に中空オーガー5は切削中に、地盤の軟弱な方へ移動しやすく、正確に鉛直性を維持することが困難である。
しかし本願発明の工法ではソイルセメントコラム1の中心に支持兼ガイド管4が残って位置しているから、その支持兼ガイド管4をガイドとして貫入して行くので正確な鉛直性を確保することが容易である。
こうして、中空オーガー5を、ソイルセメントコラム1内に回転させて貫入し、先端の切削ビット53でソイルセメントコラム1を粉砕してその先端まで破壊してゆく。
<16> Grinding of the soil cement column. (Fig. 7)
When the hollow auger 5 is inserted into the outer periphery of the support / guide tube 4 and is rotated, the hollow auger 5 accurately enters the ground using the central support / guide tube 4 as a guide.
In general, the hollow auger 5 is likely to move to a softer ground during cutting, and it is difficult to accurately maintain the verticality.
However, in the method of the present invention, since the support / guide tube 4 remains in the center of the soil cement column 1, the support / guide tube 4 penetrates as a guide, so that accurate verticality can be ensured. Easy.
Thus, the hollow auger 5 is rotated and penetrated into the soil cement column 1, and the soil cement column 1 is crushed by the cutting bit 53 at the tip and broken to the tip.

<17>支持兼ガイド管の引き上げ。
中空オーガー5でソイルセメントコラム1の先端まで切削し、ソイルセメントコラムの切削スライムを地上に排出した後、中空オーガー5の回転を停止する。
そして中空オーガー5の中心の中空管51内に取り込んだ支持兼ガイド管4を地上に引き上げて抜き取る。
その結果、中空オーガー5の中空管51の内部は空洞となる。
<17> Pull up the support and guide tube.
After cutting to the tip of the soil cement column 1 with the hollow auger 5 and discharging the cutting slime of the soil cement column to the ground, the rotation of the hollow auger 5 is stopped.
Then, the support / guide tube 4 taken into the hollow tube 51 at the center of the hollow auger 5 is pulled up to the ground and extracted.
As a result, the hollow tube 51 of the hollow auger 5 is hollow.

<18>埋め戻し土の充填。(図8)
空洞になった中空管51の内部または外部に、地上から埋め戻し土6を投入する。
そして中空オーガー5に引抜き方向の回転とは逆の回転を与え、埋め戻し土6を、地中内のソイルセメントコラム1の切削跡内に充填しつつ引き上げてゆく。
このように、ソイルセメントコラム1の切削跡に埋め戻し土6を供給して充填するため、周囲の地盤が緩むことがない。
また、多少高価になるが地盤の汚染にかかわる六価クロムの溶出を抑えた固化材を使用すれはソイルセメントコラムを粉砕し、地盤中に残しておくこともできる。この場合には撤去費用を大幅に削減することができる。
こうしてソイルセメントコラム1の撤去が完了する。
<18> Filling with backfilling soil. (Fig. 8)
The backfilling soil 6 is put into the hollow tube 51 that has become a hollow space from the ground.
Then, the hollow auger 5 is rotated in the direction opposite to the rotation in the pulling direction, and the backfilling soil 6 is pulled up while being filled in the cutting trace of the soil cement column 1 in the ground.
Thus, since the backfill soil 6 is supplied and filled in the cutting trace of the soil cement column 1, the surrounding ground does not loosen.
Moreover, if a solidified material that suppresses the elution of hexavalent chromium, which is slightly expensive but is involved in soil contamination, the soil cement column can be crushed and left in the ground. In this case, the removal cost can be greatly reduced.
Thus, the removal of the soil cement column 1 is completed.

1:ソイルセメントコラム
2:攪拌ロッド
21:中空筒
21a:縦溝
21d:ピン
4:支持兼ガイド管
5:中空オーガー
51:中空管
7:蓋兼先端刃
71:薄板
72:厚板
75:変形空間
1: soil cement column 2: stirring rod 21: hollow cylinder 21a: longitudinal groove 21d: pin 4: support and guide tube 5: hollow auger 51: hollow tube 7: lid and tip blade 71: thin plate 72: thick plate 75: Deformation space

Claims (2)

中空筒の周囲に攪拌翼を取り付けた攪拌ロッドを使用し、
固化材を吐出しながら攪拌ロッドを地中に回転させて貫入し、
中空筒の周囲に土砂と固化材を攪拌したソイルセメントコラムを形成し、
その後に中空筒の内部に、支持兼ガイド管として端部を開放した鋼管を挿入し、
内部に固化材を充填した支持兼ガイド管を地中に残して攪拌ロッドを回転しながら引き上げる方法であって、
前記中空筒の先端には、
ピンで軸止めした蓋兼先端刃を、ピンを中心に回転自在に取り付け、
前記支持兼ガイド管を中空筒内に挿入する過程で、
支持兼ガイド管の先端によって前記蓋兼先端刃を押し下げることで、
蓋兼先端刃をピンを中心に回転させ、
支持兼ガイド管の先端をソイルセメントコラムの底部まで到達できるように構成したことを特徴とする、
撤去が容易なソイルセメントコラムの構築方法。
Using a stirring rod with a stirring blade around the hollow cylinder,
While discharging the solidified material, rotate the stirring rod into the ground and penetrate,
A soil cement column in which earth and sand and solidifying material are agitated is formed around the hollow cylinder,
After that, inside the hollow cylinder, insert a steel pipe with an open end as a support and guide pipe,
It is a method of pulling up while rotating the stirring rod while leaving the support and guide tube filled with the solidifying material in the ground,
At the tip of the hollow cylinder,
A lid and tip blade fixed with a pin are attached so as to be rotatable around the pin.
In the process of inserting the support and guide tube into the hollow cylinder,
By pushing down the lid and tip blade by the tip of the support and guide tube,
Rotate the lid and tip blade around the pin,
The tip of the support and guide tube is configured to reach the bottom of the soil cement column,
A method for constructing a soil cement column that is easy to remove.
請求項1記載の方法であって、
蓋兼先端刃は中間の厚板と、
その両側の薄板で構成してある、
撤去が容易なソイルセメントコラムの構築方法。
The method of claim 1, comprising:
The lid / tip blade is a thick plate in the middle,
It consists of thin plates on both sides,
A method for constructing a soil cement column that is easy to remove.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018135683A (en) * 2017-02-21 2018-08-30 株式会社三誠 Ground improvement device and ground improvement method
CN115341529A (en) * 2022-09-19 2022-11-15 中国路桥工程有限责任公司 Cement stirring grouting reinforcement treatment method and device for deep soft soil foundation

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Publication number Priority date Publication date Assignee Title
JPH09273142A (en) * 1996-04-04 1997-10-21 Chiyoda Corp Lower cover device of casing pipe for pack drain
JPH1096229A (en) * 1996-09-24 1998-04-14 Taiyo Kiso Kogyo Kk Construction method of soil column
JP2009228419A (en) * 2008-02-27 2009-10-08 Jfe Steel Corp Construction method for geothermal heat exchanger, hollow pipe body used in this method, and casing
JP2012021310A (en) * 2010-07-14 2012-02-02 Sekkeishitsu Soil:Kk Construction and removal methods of soil cement column

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Publication number Priority date Publication date Assignee Title
JPH09273142A (en) * 1996-04-04 1997-10-21 Chiyoda Corp Lower cover device of casing pipe for pack drain
JPH1096229A (en) * 1996-09-24 1998-04-14 Taiyo Kiso Kogyo Kk Construction method of soil column
JP2009228419A (en) * 2008-02-27 2009-10-08 Jfe Steel Corp Construction method for geothermal heat exchanger, hollow pipe body used in this method, and casing
JP2012021310A (en) * 2010-07-14 2012-02-02 Sekkeishitsu Soil:Kk Construction and removal methods of soil cement column

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018135683A (en) * 2017-02-21 2018-08-30 株式会社三誠 Ground improvement device and ground improvement method
CN115341529A (en) * 2022-09-19 2022-11-15 中国路桥工程有限责任公司 Cement stirring grouting reinforcement treatment method and device for deep soft soil foundation
CN115341529B (en) * 2022-09-19 2023-09-01 中国路桥工程有限责任公司 Cement stirring grouting reinforcement treatment method and device for deep soft soil foundation

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