JP3956171B2 - Ground improvement method and ground improvement equipment - Google Patents

Ground improvement method and ground improvement equipment Download PDF

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JP3956171B2
JP3956171B2 JP15475598A JP15475598A JP3956171B2 JP 3956171 B2 JP3956171 B2 JP 3956171B2 JP 15475598 A JP15475598 A JP 15475598A JP 15475598 A JP15475598 A JP 15475598A JP 3956171 B2 JP3956171 B2 JP 3956171B2
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discharge port
rod
switching
improved material
ground
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JPH11350468A (en
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修 柴田
経 西尾
貞夫 中村
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Onoda Chemico Co Ltd
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Onoda Chemico Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は掘削ロッドの先端にロッド本体の上下部に改良材の吐出口を有する攪拌ヘッドを取り付け、その吐出口を切換えて改良材と土壌とを攪拌混合して地盤を改良する地盤改良工法およびその装置に関する。
【０００２】
【従来の技術】
従来より攪拌ヘッドに設けられた上下の吐出口を切替えて改良材を吐出して地盤を改良する技術として、例えば、特公平５ー６２１６７号や特公平６ー３９７７９号が開示されている。
しかしながら、これらの技術は何れも攪拌ヘッドが二重管構造であるため、構造が複雑となり、装置が大型化するという問題がある。
【０００３】
【発明が解決しようとする課題】
また、単管構造の攪拌ヘッドの吐出切換装置として特開平６ー１４６２６７号が提案されている。この装置は上部攪拌翼と下部攪拌翼にそれぞれ上部ハウジングと下部ハウジングが被せられ、各ハウジングが相対的にあるストロークだけ上下動する構成となっているいるが、装置が大型化し、重量も重く、貫入抵抗が増し、土質によっては貫入不能になるなどの問題は解消されない。
【０００４】
さらに、攪拌ヘッドの正転・逆転により吐出口を切換える方法があるが、この方法は攪拌ヘッドの回転方向が限定されるので、施工時に攪拌ヘッドの正転・逆転を併用して施工することが出来ないという問題がある。
また、従来技術の何れもが、上下吐出口の切換えが適切に行われているか否かを確認する手段を持っていないという問題がある。
【０００５】
本発明はこれらの問題を解決するためになされたもので、簡便な構造の上下吐出口切換機構により改良材の吐出口を切換えて、且つ、吐出口の切換えが適切に行われているか否かを確認しながら地盤を改良する地盤改良工法およびそれに用いる装置を提供することである。
【０００６】
【課題を解決するための手段】
この発明はこれらの課題を解決するために、改良材流通路を有する中空ロッドのロッド本体に複数段の攪拌翼が取り付けられ、かつ、ロッド本体の上下部に改良材吐出口がそれぞれ設けられた攪拌ヘッドを、掘削ロッドの先端に取り付けた地盤改良装置の攪拌ヘッドの吐出口から吐出した改良材と土壌とを攪拌混合して地盤を改良する地盤改良工法において、前記地盤改良装置の攪拌ヘッドを単管構造とし、該攪拌ヘッドのロッド本体の上部に上部吐出口、下部に下部吐出口をそれぞれ設けるとともに、ロッドの貫入時と引き上げ時に作用する土圧の相違を利用した上下吐出口切換機構をロッド本体に設け、該吐出口切換機構によりロッド貫入時には下部吐出口から、ロッド引き上げ時には上部吐出口から、それぞれ改良材を吐出して改良材と土壌とを攪拌混合し、地盤を改良する地盤改良工法である。
【０００７】
また、改良材流通路を有する中空ロッドのロッド本体に複数段の攪拌翼を設け、前記改良材流通路と連通する吐出口をロッド本体の上下部にそれぞれ設けた攪拌ヘッドを、掘削ロッドの先端部に取り付けた地盤改良装置において、前記、攪拌ヘッドを単管構造とし、また、ロッド本体にロッドの貫入および引き上げ時に作用する土圧により一定の距離だけ上下動可能に切換翼を取り付け、該切換翼の連結杆に設けたストップバルブにより、貫入時には改良材流通路を下部吐出口と連通させ、ロッド引き上げ時には下部吐出口の改良材流通路を閉止する上下吐出口切換機構を上段攪拌翼の上部に設け、また、上部吐出口に、ある流体圧以上で開口する逆止弁を設けた地盤改良装置に構成したことである。
【０００８】
また、改良材流通路を有する中空ロッドのロッド本体に、複数段の攪拌翼を設け、前記改良材流通路と連通する改良材吐出口をロッド本体の上下部にそれぞれ設けた攪拌ヘッドを、掘削ロッドの先端部に取り付けた地盤改良装置において、前記攪拌ヘッドを単管構造とし、また、翼本体の幅方向の中心位置からはずれた位置に連結杆を有する切換翼を、ロッド本体の上段攪拌翼の上部に取り付け、ロッドの貫入、引き上げに伴う切換翼及び連結杆の回動で改良材流通路中に介装された、径の異なる二つの通路を有する通路切換弁の通路を、ロッドの貫入時には下部吐出口に、ロッド引き上げ時には、上部吐出口にそれぞれ連通させる上下吐出口切換機構を設けた地盤改良装置としたことである。
【０００９】
上下吐出口の切換えの確認を注入ポンプの圧力ゲージの目盛の読みで行う地盤改良装置としたことである。
【００１０】
本発明は以上の構成としたので。次の作用効果を生じる。
▲１▼ 攪拌ヘッド本体を単管構造としたので、構造が簡単であり取り扱いも容易である。
▲２▼ 攪拌ヘッドの上下動で上下吐出口を切換える構成としたので、攪拌ヘッドの回転方向に関係なく吐出口を切換えることができる。
▲３▼ 上下吐出口を切換えるために、駆動（動力）源を必要としないので、経済的である。
▲４▼ 上部吐出口にある流体圧以上で開口する逆止弁を設けたことにより、注入ポンプの圧力ゲージの読みで、上下吐出口の切換えが適切に行われているか否かを確認することができる。
▲５▼ 上下吐出口への切換えに、径の異なる二つの通路を有する通路切換弁を使用したことにより。注入ポンプの圧力ゲージの読みで上下吐出口の切換えが適切に行われているか否かを確認することができる。
【００１１】
【発明の実施の形態】
本発明の実施の形態を、以下実施例に基づき説明する。
図１は本発明の請求項１記載の地盤改良工法に用いる地盤改良装置の攪拌ヘッドの全体正面図である。該改良装置の攪拌ヘッド１は、ロッド本体２を単管構造とし、該ロッド本体２に複数段の攪拌翼６，７が突設され、また、ロッド本体の上部に上部吐出口３を、下部に下部吐出口４がそれぞれ設けられ、上段攪拌翼６の上部に図２〜図５に示す上下吐出口切換機構２０，２０ａを設けた構成から成る。
【００１２】
改良材の上下吐出口切換機構２０は以下の構成より成る。
図２に示すように改良材流通路１１を有するロッド本体２の上部吐出口３の下部に設けられた上段攪拌翼６（図２では省略）の上部に切換翼５を設ける。
この切換翼５はロッド本体２の改良材流通路１１の一部径拡大部１１ａに配設されたストップバルブ９と連結杆８とで連結されていて、ロッドの貫入あるいは引き上げ時に切換翼５に作用する土圧により、ロッド本体２の上下方向に一定距離だけ上下動可能に取り付けられている。
また、上部吐出口３にはある一定の流体圧以上で開口する逆止弁１０が設置されている
【００１３】
以上のように構成された攪拌ヘッド１を掘削ロッド（図示せず）に取り付け掘削ロッドを回転させながら地盤に貫入していく。この場合、攪拌ヘッド１には上向きの土圧が作用するため、ロッド本体２に一定距離だけ上下動自在に取り付けられた切換翼５は上端位置（図２に実線で示す位置）まで押上られて停止する。
【００１４】
この時、切換翼５に連結された連結杆８に取り付けられたストップバルブ９は切換翼５の上昇にともなって、改良材流通路１１の一部径拡大部１１ａ内を上昇し、切換翼が上端位置で停止した時、ストップバルブ９も改良材流通路１１が下部吐出口４と連通された状態で停止する。この場合、上部吐出口３も連通しているが、改良材の吐出は上部吐出口に設けた逆止弁１０が開口する流体圧以下の圧力での下部吐出口４からの吐出のため、逆止弁１０の作用により上部吐出口３からは吐出しない。
このように下部吐出口４から改良材を吐出しながら所定深度まで掘削・攪拌を行った後、掘削ロッドを回転させながら引き上げる。
【００１５】
この掘削ロッドの回転引き上げの場合、攪拌ヘッド１には貫入時とは逆の下向きの土圧が作用するため、切換翼５は下端まで押し下げられて停止する。（図２に点線で示した位置）。
この時、ストップバルブ９も下降し、改良材流通路１１に嵌合された状態で停止し、下部吐出口への改良材流通路１１ｂを閉塞し、改良材流通路１１を上部吐出口３に連通させる。
この状態で改良材を上部吐出口３に設けた逆止弁１０が開口する流体圧の圧力で上部吐出口３から吐出して掘削ロッドを回転させながら引き上げて地盤の改良を行う。
【００１６】
なお、下部吐出口４に土砂などの流入を防止するため、上部吐出口３の逆止弁１０が開口する流体圧以下の圧力で開口する逆止弁を設けてもよい。
上下吐出口３，４の切換えが適切に行われているか否かは、図示はしていないが注入ポンプの圧力ゲージの読みで確認する。すなわち、改良材が上部吐出口３から吐出されている場合は、圧力ゲージの読みは上部吐出口３の逆止弁１０が開口する圧力値以上の値を示し、下部吐出口４から吐出されている場合はそれ以下の値を示す。
なお、実施例ではストップバルブ９の形状を球状としたが、これに限定されるものではなく、錐状のものなど種々の形状が考えられる。
【００１７】
次に、請求項３に記載の地盤改良装置およびそれを用いた工法の実施例について説明する。
図３に示す様に切換翼５ａを翼本体の幅方向の中心位置から外れた位置で連結杆８ａによりロッド本体２に取り付ける。ロッド本体内部の改良材流通路１１の途中に、図５に示すように径の異なった通路１３ａ，１３ｂを有する通路切換弁１２が介装されていて、該通路切換弁１２の径の異なった二つの通路（１３ａ，１３ｂ）の切換えにより改良材流通路１１がそれぞれ上部吐出口３，下部吐出口４に連通する構造からなる上下吐出口切換機構２０ａが設けられている。
通路切換弁１２の通路切換えは、切換翼５ａ及び連結杆８ａの回動（図４参照）によって行われるように構成されている。
【００１８】
以上のように構成された攪拌ヘッドを掘削ロッド（図示せず）に取り付け、掘削ロッドを回転させながら地盤に貫入して行く。この場合、攪拌ヘッドには上向きの土圧が作用するため、切換翼５ａ及び連結杆８ａは連結杆を中心として図４中に実線で示した位置まで回動し、通路切換弁１２の通路は図５（Ａ）に示すようになって、改良材流通路１１は通路切換弁１２の大径通路１３ａより下部吐出口４に連通される。
【００１９】
この状態で改良材を下部吐出口４から吐出して所定深度まで掘削・攪拌を行った後、掘削ロッドを回転させながら引き上げる。この場合、攪拌ヘッドには下向きの土圧が作用するため、切換翼５ａと連結杆８ａは連結杆を中心として図４中の点線で示した位置まで回動し、通路切換弁１２の通路は図５（Ｂ）に示すようになって、改良材通路１１は通路切換弁１２の小径通路１３ｂにより上部吐出口３に連通される。
この状態で改良材を上部吐出口３から吐出して掘削ロッドを回転させて引き上げて地盤改良を行う。
【００２０】
上下吐出口の切換えが適切に行われているか否かは、注入ポンプの圧力ゲージの読みで確認する。すなわち、改良材が上部吐出口から吐出されている場合は、通路切換弁１２の小径通路１３ｂで連通されているため通路切換弁１２の大径通路１３ａで連通される下部吐出部４からの吐出時に比べ圧力ゲージの読みは高い値を出す。
上部吐出口３を大径通路１３ａ、下部吐出口４を小径通路１３ｂで連通させた場合は、改良材が上部吐出口３から吐出されている時は、下部吐出口４からの吐出時に比べ圧力ゲージの読みは低い値を示す。
【００２１】
以上の実施例にみるように、本発明の工法及び装置は掘削ロッド貫入時、引き上げ時ともに複数段の全ての攪拌翼によって効率的な改良材と土壌との攪拌・混合を行うことができる。
また、本実施例では、上段攪拌翼の上部に別途切換翼を設ける構成としたが、この切換翼は攪拌翼の機能を有することは勿論であり、また、また上段攪拌翼を切換翼とする構成に出来ることも当然である。
【００２２】
なお、本発明の工法は、機械攪拌工法に限定されるものではなく、高圧噴射、水平改良、薬液注入などの各分野における薬液流路切換えにも十分適用することができる。
【００２３】
【発明の効果】
本発明による地盤改良工法で地盤改良を実施した結果、本明細書の作用の項に記載したとおりの作用効果が確認でき、均一な品質の改良体を得ることができ、所望の改良効果を得ることができた。
【図面の簡単な説明】
【図１】本発明の地盤改良工法に用いる攪拌ヘッド全体の正面図である。
【図２】請求項２記載の攪拌ヘッドの上下部吐出口切換機構の要部概略断面図である。
【図３】請求項３記載の攪拌ヘッドの上下部吐出口切換機構の要部概略断面図である。
【図４】請求項３記載の切換翼及び連結杆の回動状態を示す概略図である。
【図５】請求項３記載の上下部吐出口切換機構の通路切換弁の作動状態を示す概略図である。
【符号の説明】
１ 攪拌ヘッド
２ ヘッド本体
３ 上部吐出口
４ 下部吐出口
５ 切換翼
５ａ 切換翼
６ 上段攪拌翼
７ 攪拌翼
８ 連結杆
８ａ 連結杆
９ ストップバルブ
１０ 逆止弁
１１ 改良材流通路
１１ａ 一部径拡大部
１２ 通路切換弁
１３ 通路切換弁通路
２０ 上下吐出口切換機構
２０ａ 上下吐出口切換機構[0001]
BACKGROUND OF THE INVENTION
The present invention provides a ground improvement method for improving the ground by attaching a stirring head having an improvement material discharge port to the top and bottom of the rod body at the tip of the excavation rod, and switching the discharge port to stir and mix the improvement material and soil. It relates to the device.
[0002]
[Prior art]
For example, Japanese Patent Publication No. 5-62167 and Japanese Patent Publication No. 6-39779 have been disclosed as techniques for improving the ground by switching the upper and lower discharge ports provided in the stirring head and discharging the improvement material.
However, both of these techniques have a problem that the agitation head has a double-pipe structure, so that the structure becomes complicated and the apparatus becomes large.
[0003]
[Problems to be solved by the invention]
Japanese Laid-Open Patent Publication No. 6-146267 has been proposed as a discharge switching device for a single-tube stirring head. This device is configured so that the upper and lower agitating blades are covered with an upper housing and a lower housing, respectively, and each housing moves up and down by a certain stroke relatively, but the device becomes larger and heavier. Penetration resistance will increase, and problems such as inability to penetrate depending on the soil will not be solved.
[0004]
Furthermore, there is a method of switching the discharge port by forward / reverse rotation of the stirring head, but since this method limits the rotation direction of the stirring head, it can be applied by using forward / reverse rotation of the stirring head at the time of construction. There is a problem that it cannot be done.
In addition, none of the conventional techniques has a means for confirming whether or not the upper and lower discharge ports are appropriately switched.
[0005]
The present invention has been made to solve these problems, and whether or not the discharge port of the improved material is switched by the upper and lower discharge port switching mechanism having a simple structure, and whether or not the discharge port is appropriately switched. It is to provide a ground improvement method for improving the ground while confirming the above and a device used therefor.
[0006]
[Means for Solving the Problems]
In order to solve these problems, the present invention is provided with a plurality of stirrer blades attached to a rod body of a hollow rod having an improved material flow passage, and improved material discharge ports provided at the upper and lower portions of the rod body. In the ground improvement method for improving the ground by stirring and mixing the improvement material discharged from the discharge port of the stirring head of the ground improvement device attached to the tip of the excavation rod and the soil, the stirring head of the ground improvement device is A single-pipe structure with an upper discharge port at the upper part of the rod body of the stirring head and a lower discharge port at the lower part, and an upper and lower discharge port switching mechanism that utilizes the difference in earth pressure that acts when the rod is inserted and pulled up An improved material is provided on the rod body, and the improved material is discharged from the lower discharge port when the rod is inserted by the discharge port switching mechanism and from the upper discharge port when the rod is lifted. The soil was mixed and stirred, a ground improvement method to improve the soil.
[0007]
Further, a stirrer head provided with a plurality of stirrer blades in a rod body of a hollow rod having an improved material flow passage, and a discharge head communicating with the improved material flow passage respectively provided in the upper and lower portions of the rod body, the tip of the excavation rod In the ground improvement device attached to the section, the stirring head has a single tube structure, and a switching blade is attached to the rod body so that it can be moved up and down by a certain distance by earth pressure acting when the rod is inserted and pulled up. the stop valve provided in the connecting rod of the wing, at the time of intrusion in communication with the lower portion discharge port improved material flow path, at the time of the rod pulling the upper and lower discharge port switching mechanism for closing an improved material flow path of the lower discharge port of the upper stirring blade The ground improvement device is provided with a check valve provided at the upper part and provided with a check valve that opens at a certain fluid pressure or higher at the upper discharge port.
[0008]
Further, excavating the stirring head provided with a plurality of stirrer blades in the rod body of the hollow rod having the improved material flow passage and provided with the improved material discharge ports communicating with the improved material flow passage in the upper and lower portions of the rod body, respectively. In the ground improvement device attached to the tip of the rod, the stirring head has a single tube structure, and a switching blade having a connecting rod at a position deviated from the center position in the width direction of the blade body is provided with an upper stirring blade of the rod body. The passage of the passage switching valve having two passages with different diameters, which are interposed in the improvement material flow passage by turning of the switching blade and the connecting rod when the rod is inserted, is inserted in the upper part of the rod. It is a ground improvement device provided with a vertical discharge port switching mechanism that is sometimes communicated to the lower discharge port and to the upper discharge port when the rod is lifted.
[0009]
It is a ground improvement device that confirms the switching of the upper and lower discharge ports by reading the scale of the pressure gauge of the injection pump.
[0010]
Since the present invention has the above configuration. The following effects are produced.
(1) Since the stirring head body has a single tube structure, the structure is simple and the handling is easy.
(2) Since the upper and lower discharge ports are switched by the vertical movement of the stirring head, the discharge ports can be switched regardless of the rotation direction of the stirring head.
(3) Since a drive (power) source is not required to switch the upper and lower discharge ports, it is economical.
(4) Check whether the upper and lower discharge ports are properly switched by reading the pressure gauge of the infusion pump by providing a check valve that opens above the fluid pressure at the upper discharge port. Can do.
(5) By using a passage switching valve having two passages with different diameters for switching to the upper and lower discharge ports. It is possible to confirm whether the upper and lower discharge ports are appropriately switched by reading the pressure gauge of the infusion pump.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on examples.
FIG. 1 is an overall front view of a stirring head of a ground improvement device used in a ground improvement method according to claim 1 of the present invention. The stirring head 1 of the improved apparatus has a rod body 2 having a single tube structure, a plurality of stirring blades 6 and 7 projecting from the rod body 2, and an upper discharge port 3 at the upper part of the rod body. The lower discharge ports 4 are respectively provided, and the upper and lower discharge port switching mechanisms 20 and 20a shown in FIGS.
[0012]
The improved material upper / lower outlet switching mechanism 20 has the following configuration.
As shown in FIG. 2, a switching blade 5 is provided above the upper stirring blade 6 (not shown in FIG. 2) provided at the lower portion of the upper discharge port 3 of the rod body 2 having the improved material flow passage 11.
This switching blade 5 is connected by a stop valve 9 and a connecting rod 8 which are disposed in a part of the diameter-enlarging portion 11a of the improved material flow passage 11 of the rod body 2, and is connected to the switching blade 5 when the rod is inserted or pulled up. The rod body 2 is attached so as to be movable up and down by a predetermined distance in the vertical direction of the rod body 2 by the earth pressure acting.
The upper discharge port 3 is provided with a check valve 10 that opens at a certain fluid pressure or higher.
The stirring head 1 configured as described above is attached to a drilling rod (not shown) and penetrates into the ground while rotating the drilling rod. In this case, since upward earth pressure acts on the stirring head 1, the switching blade 5 attached to the rod body 2 so as to be movable up and down by a predetermined distance is pushed up to the upper end position (position indicated by a solid line in FIG. 2). Stop.
[0014]
At this time, the stop valve 9 attached to the connecting rod 8 connected to the switching blade 5 rises in the partial diameter enlarged portion 11a of the improved material flow passage 11 as the switching blade 5 rises. When stopping at the upper end position, the stop valve 9 also stops with the improved material flow passage 11 in communication with the lower discharge port 4. In this case, the upper discharge port 3 is also communicated, but the discharge of the improved material is reverse because it is discharged from the lower discharge port 4 at a pressure lower than the fluid pressure at which the check valve 10 provided at the upper discharge port opens. No discharge is made from the upper discharge port 3 by the action of the stop valve 10.
Thus, after excavating and stirring to a predetermined depth while discharging the improved material from the lower discharge port 4, the excavating rod is pulled up while rotating.
[0015]
In the case of rotating the excavating rod, since a downward earth pressure opposite to that when penetrating acts on the stirring head 1, the switching blade 5 is pushed down to the lower end and stops. (Position indicated by dotted line in FIG. 2).
At this time, the stop valve 9 is also lowered and stopped in a state where it is fitted to the improved material flow passage 11, the improved material flow passage 11 b to the lower discharge port is closed, and the improved material flow passage 11 is connected to the upper discharge port 3. Communicate.
In this state, the improvement material is discharged from the upper discharge port 3 by the fluid pressure at which the check valve 10 provided at the upper discharge port 3 opens, and the excavation rod is rotated to improve the ground.
[0016]
In order to prevent inflow of earth and sand into the lower discharge port 4, a check valve that opens at a pressure equal to or lower than the fluid pressure at which the check valve 10 of the upper discharge port 3 opens may be provided.
Whether or not the upper and lower discharge ports 3 and 4 are appropriately switched is confirmed by reading the pressure gauge of the infusion pump (not shown). That is, when the improving material is discharged from the upper discharge port 3, the reading of the pressure gauge shows a value equal to or higher than the pressure value at which the check valve 10 of the upper discharge port 3 opens and is discharged from the lower discharge port 4. If it is, the value below that is shown.
In the embodiment, the shape of the stop valve 9 is spherical. However, the shape is not limited to this, and various shapes such as a conical shape are conceivable.
[0017]
Next, an embodiment of the ground improvement device according to claim 3 and a construction method using the same will be described.
As shown in FIG. 3, the switching blade 5a is attached to the rod body 2 by the connecting rod 8a at a position deviated from the center position in the width direction of the blade body. As shown in FIG. 5, a passage switching valve 12 having passages 13a and 13b having different diameters is interposed in the middle of the improvement material flow passage 11 inside the rod body. The diameter of the passage switching valve 12 is different. An upper / lower discharge port switching mechanism 20a having a structure in which the improved material flow passage 11 communicates with the upper discharge port 3 and the lower discharge port 4 by switching between the two passages (13a, 13b) is provided.
The passage switching of the passage switching valve 12 is performed by turning the switching blade 5a and the connecting rod 8a (see FIG. 4).
[0018]
The agitation head configured as described above is attached to an excavation rod (not shown), and penetrates into the ground while rotating the excavation rod. In this case, since the upward earth pressure acts on the stirring head, the switching blade 5a and the connecting rod 8a rotate around the connecting rod to the position shown by the solid line in FIG. As shown in FIG. 5A, the improved material flow passage 11 communicates with the lower discharge port 4 through the large-diameter passage 13 a of the passage switching valve 12.
[0019]
In this state, after the improvement material is discharged from the lower discharge port 4 and excavated and stirred to a predetermined depth, the excavating rod is pulled up while rotating. In this case, since the downward earth pressure acts on the stirring head, the switching blade 5a and the connecting rod 8a rotate about the connecting rod to the position indicated by the dotted line in FIG. As shown in FIG. 5B, the improvement material passage 11 is communicated with the upper discharge port 3 by the small diameter passage 13 b of the passage switching valve 12.
In this state, the improvement material is discharged from the upper discharge port 3, and the excavation rod is rotated and pulled up to improve the ground.
[0020]
Whether the upper and lower discharge ports are properly switched is confirmed by reading the pressure gauge of the infusion pump. That is, when the improved material is discharged from the upper discharge port, the improved material is communicated through the small-diameter passage 13b of the passage switching valve 12, so that the discharge from the lower discharge portion 4 communicated through the large-diameter passage 13a of the passage switching valve 12 is performed. Pressure gauge readings are higher than sometimes.
When the upper discharge port 3 is communicated with the large-diameter passage 13a and the lower discharge port 4 is communicated with the small-diameter passage 13b, when the improving material is discharged from the upper discharge port 3, the pressure is higher than when discharging from the lower discharge port 4. The gauge reading shows a low value.
[0021]
As seen in the above embodiments, the method and apparatus of the present invention can efficiently stir and mix the improving material and the soil with all the stirring blades in a plurality of stages both when the excavation rod is inserted and when it is pulled up.
In this embodiment, a switching blade is separately provided on the upper part of the upper stirring blade. Of course, this switching blade has the function of a stirring blade, and the upper stirring blade is used as a switching blade. Of course, it can be configured.
[0022]
In addition, the construction method of the present invention is not limited to the mechanical stirring method, and can be sufficiently applied to the switching of chemical flow paths in various fields such as high-pressure injection, horizontal improvement, and chemical injection.
[0023]
【The invention's effect】
As a result of the ground improvement by the ground improvement method according to the present invention, it is possible to confirm the effects as described in the action section of the present specification, obtain an improved body of uniform quality, and obtain a desired improvement effect. I was able to.
[Brief description of the drawings]
FIG. 1 is a front view of an entire stirring head used in a ground improvement method according to the present invention.
FIG. 2 is a schematic sectional view of a main part of an upper / lower discharge port switching mechanism of a stirring head according to claim 2;
3 is a schematic cross-sectional view of a main part of an upper and lower discharge port switching mechanism of a stirring head according to claim 3. FIG.
FIG. 4 is a schematic view showing a rotating state of the switching blade and the connecting rod according to claim 3;
FIG. 5 is a schematic view showing an operating state of a passage switching valve of an upper and lower discharge port switching mechanism according to claim 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stirring head 2 Head main body 3 Upper discharge port 4 Lower discharge port 5 Switching blade 5a Switching blade 6 Upper stirring blade 7 Stirring blade 8 Connecting rod 8a Connecting rod 9 Stop valve 10 Check valve 11 Improved material flow passage 11a Partial diameter expansion Part 12 Passage switching valve 13 Passage switching valve passage 20 Vertical discharge port switching mechanism 20a Vertical discharge port switching mechanism

Claims (4)

改良材流通路を有する中空ロッドのロッド本体に複数段の攪拌翼が取り付けられ、かつ、ロッド本体の上下部に改良材吐出口がそれぞれ設けられた攪拌ヘッドを、掘削ロッドの先端に取り付けた地盤改良装置の攪拌ヘッドの吐出口から吐出した改良材と土壌とを攪拌混合して地盤を改良する地盤改良工法において、前記地盤改良装置の攪拌ヘッドを単管構造とし、該攪拌ヘッドのロッド本体の上部に上部吐出口、下部に下部吐出口をそれぞれ設けるとともに、ロッドの貫入時と引き上げ時に作用する土圧の相違を利用した上下吐出口切換機構をロッド本体の上段攪拌翼の上部に、また、ある流体圧以上で開口する逆止弁を上部吐出口に設け、上下吐出口切換機構によりロッド貫入時には下部吐出口から、ロッド引き上げ時には上部吐出口からのそれぞれの改良材の吐出を、改良材が上部吐出口から吐出されている場合は、圧力ゲージの読みは上部吐出口の逆止弁が開口する圧力値以上の値を示し、下部吐出口から吐出されている場合はそれ以下の値を示すことによる注入ポンプの圧力ゲージの読みで上下吐出口の切換を確認し、改良材と土壌とを攪拌混合し、地盤を改良することを特徴とする地盤改良工法。A ground where a plurality of stirrer blades are attached to a rod body of a hollow rod having an improved material flow passage, and an agitation head provided with improved material discharge ports at the upper and lower portions of the rod body is attached to the tip of a drilling rod. In the ground improvement method for improving the ground by stirring and mixing the improved material discharged from the discharge port of the stirring head of the improved device and the soil, the stirring head of the ground improving device has a single pipe structure, and the rod body of the stirring head An upper discharge port is provided at the upper part and a lower discharge port is provided at the lower part, and an upper and lower discharge port switching mechanism that utilizes the difference in earth pressure acting when the rod is inserted and pulled up is provided above the upper stirring blade of the rod body . provided a check valve which opens on one fluid pressure or the upper discharge port, from the lower discharge port at the time of rod penetrated by the vertical discharge port switching mechanism, at the time of rod pulled up from the upper discharge opening The discharge of each of the modifying material, if the improvement material is discharged from the upper discharge port, the pressure reading gauge indicates a value of more than the pressure value check valve of the upper discharge opening is opened, discharged from the lower discharge port The ground is characterized by improving the ground by confirming the switching of the upper and lower discharge ports by reading the pressure gauge of the infusion pump by showing a value less than that, and stirring and mixing the improvement material and the soil. Improved construction method. 改良材流通路を有する中空ロッドのロッド本体に複数段の攪拌翼を設け、前記改良材流通路と連通する吐出口をロッド本体の上下部にそれぞれ設けた攪拌ヘッドを、掘削ロッドの先端部に取り付けた地盤改良装置において、前記、攪拌ヘッドを単管構造とし、また、ロッド本体にロッドの貫入および引き上げ時に作用する土圧により一定の距離だけ上下動可能に切換翼を取り付け、該切換翼の連結杆に設けたストップバルブにより、貫入時には改良材流通路を下部吐出口と連通させ、ロッド引き上げ時には下部吐出口の改良材流通路を閉止する上下吐出口切換機構を上段攪拌翼の上部に設け、また、上部吐出口に、ある流体圧以上で開口する逆止弁を設けたことを特徴とする地盤改良装置。A hollow rod having an improved material flow passage is provided with a plurality of stirrer blades on the rod body, and an agitation head provided with discharge ports communicating with the improved material flow passage at the upper and lower portions of the rod body is provided at the tip of the excavation rod. In the attached ground improvement device, the stirring head has a single-pipe structure, and a switching blade is attached to the rod body so that it can move up and down by a certain distance by earth pressure acting when the rod penetrates and pulls up. the stop valve provided in the connecting rod, at the time of intrusion in communication with the lower portion discharge port improved material flow path, at the time of the rod pulling the upper and lower discharge port switching mechanism for closing an improved material flow path of the lower discharge opening at the top of the upper stirring blade A ground improvement device provided with a check valve that opens at an upper discharge port at a certain fluid pressure or higher. 改良材流通路を有する中空ロッドのロッド本体に複数段の攪拌翼を設け、前記改良材流通路と連通する改良材吐出口をロッド本体の上下部にそれぞれ設けた攪拌ヘッドを、掘削ロッドの先端部に取り付けた地盤改良装置において、前記攪拌ヘッドを単管構造とし、また、翼本体の幅方向の中心位置からはずれた位置に連結杆を有する切換翼を、ロッド本体の上段攪拌翼の上部に取り付け、ロッドの貫入、引き上げに伴う切換翼及び連結杆の回動で改良材流通路中に介装された径の異なる二つの通路を有する通路切換弁の通路を、ロッドの貫入時には下部吐出口に、ロッドの引き上げ時には、上部吐出口にそれぞれ連通させる上下吐出口切換機構を設けたことを特徴とする地盤改良装置。A hollow rod having an improved material flow passage is provided with a plurality of stirrer blades on the rod body, and an improved material discharge port communicating with the improved material flow passage is provided at the upper and lower portions of the rod body. In the ground improvement device attached to the section, the stirring head has a single tube structure, and a switching blade having a connecting rod at a position deviated from the center position in the width direction of the blade body is provided above the upper stirring blade of the rod body. The passage of the passage switching valve having two passages with different diameters inserted in the improved material flow passage by the rotation of the switching blade and the connecting rod accompanying the attachment, penetration of the rod, and pulling up, the lower discharge port when the rod penetrates In addition, the ground improvement device is provided with a vertical discharge port switching mechanism that communicates with the upper discharge port when the rod is lifted. 上下吐出口の切換えの確認を注入ポンプの圧力ゲージの目盛りの読みで行うことを特徴とする請求項２〜３記載の地盤改良装置。Ground improvements apparatus according to claim 2-3, wherein the performing by the scale reading of the pressure gauge infusion pump confirmation of upper and lower discharge port of the switching.
JP15475598A 1998-06-03 1998-06-03 Ground improvement method and ground improvement equipment Expired - Fee Related JP3956171B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
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KR100846092B1 (en) 2008-02-12 2008-07-14 주식회사 한국 지오텍 Two step injection monitor of grouting for soft ground improvement
KR102306694B1 (en) 2021-05-03 2021-09-28 정광모 Agitating apparatus for ground improvement
KR102367382B1 (en) 2021-09-03 2022-02-24 거성개발(주) Method of ground improvement using agitating apparatus

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KR101157546B1 (en) * 2010-11-09 2012-06-18 박성우 Agitating apparatus for ground improvement
JP6284119B2 (en) * 2013-11-15 2018-02-28 三谷セキサン株式会社 Excavation method for pile holes with expanded head

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100846092B1 (en) 2008-02-12 2008-07-14 주식회사 한국 지오텍 Two step injection monitor of grouting for soft ground improvement
KR102306694B1 (en) 2021-05-03 2021-09-28 정광모 Agitating apparatus for ground improvement
KR102367382B1 (en) 2021-09-03 2022-02-24 거성개발(주) Method of ground improvement using agitating apparatus

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