JP3671280B2 - Ground improvement method - Google Patents
Ground improvement method Download PDFInfo
- Publication number
- JP3671280B2 JP3671280B2 JP13463795A JP13463795A JP3671280B2 JP 3671280 B2 JP3671280 B2 JP 3671280B2 JP 13463795 A JP13463795 A JP 13463795A JP 13463795 A JP13463795 A JP 13463795A JP 3671280 B2 JP3671280 B2 JP 3671280B2
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- JP
- Japan
- Prior art keywords
- discharge hole
- blade
- movable
- piece
- discharge
- 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
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【0001】
【産業上の利用分野】
この発明は、各種の軟弱地盤中にスクリュー式の回転ロッドの攪拌使用場所によって安定材の排出孔の位置を変えて適量を効率よく平均的に調整され、造成柱を形成する地盤改良工法に関するものである。
【0002】
【従来の技術】
一般にこの種の軟弱地盤に土質安定材を昇降しながら注入混合攪拌して地盤を改良造成する方法等は種々散見されている。
然し、これ等のものは、中空ロッドの下端に噴射攪拌器を装設して硬化安定材を注入噴射しながら所定深度まで攪拌混合して下降し、円筒状の最初の硬化層を形成し、その後、所定深度から徐々に引き抜き上昇回転させながら、下端の噴射攪拌器よりの注入噴射により土質安定材を噴射し、中空内部に均等に混合して所定径の改良地盤柱を造成するものが普通に実施されている。
【0003】
【発明が解決しよとうする課題】
従来この種の軟弱地盤改良にあっては、回転ロッドによる攪拌噴射器による昇降作用中に該攪拌噴射器より連続的に安定固化材を噴射しながら造形主柱を形成する場合は、形成された造成主柱の内部の密度が大きく造形柱が膨張状態になり、近傍又は隣接地に埋設されているガス管、水道管、その他各種の埋設物を側方より押圧屈曲させたり、破損したり等の被害が多々発生すると云う問題点があった。
この発明は、上述の技術の有するこのような問題点に鑑みてなされたものであり、その主とする目的とする所は、排土式の地盤改良工法であって、下降工程の右回転攪拌の時は、内部の土壌の一部を排出し、下端の可動噴射攪拌翼の可動吐出孔が内部の固定吐出孔とを一致して開口し、土質安定材を噴出混合して造成し、上昇工程の左回転攪拌の時には、該可動噴射攪拌翼が反対方向に可動して該可動吐出孔と固定吐出孔とが閉鎖され、上部に設けた上部吐出孔より土質安定材を排出混合して適度の安定密度に調整して造成することにより地中の隣接する埋設物に損傷を与えない地盤改良工法を提供しようとするものである。
【0004】
【課題を解決するための手段】
上記目的を達成するために、この発明の地盤改良工法においては、上部に駆動機構を装設したスクリュー式のロッドには、下方に上部吐出孔を設けた排出連結翼管とその下端に可動噴射攪拌翼とを連結する。この可動噴射攪拌翼の内部に該排出連結翼管と連結する固定吐出孔を穿設した固定排出筒体を挿嵌し、該可動噴射攪拌翼の外周に可動吐出孔を該固定吐出孔と一致するよう形成すると共に、外周に回転翼片を形成する。且つ、固定排出筒体には、上部外周に所定間隔を設けて右回転押圧片と左回転押圧片を各装設するようになっている。
そして、排土する中空ロッドの下降時には、該右回転押圧片が回転翼片を押圧すると可動吐出孔と内部の固定吐出孔とが一致して開孔し、土質安定材を噴出攪拌しながら下降して一次硬化層を造成する。次いで、中空ロッドの排土しない逆回転により該固定排出筒体と共に可動する左回転押圧片が回転翼片の一部を押圧することで該固定吐出孔と該可動吐出孔とを閉孔せしめ、該排出連結翼管に設けた上部吐出孔より土質安定材を排出することによって造成柱の内部に調整された二次硬化層を造成する改良工法である。
【0005】
【作用】
この発明は上述の如き構成からなり、今この改良工法について用法を図8及び図9に基づいて説明すると、排出用のスクリュー式の回転ロッド(1)の下端に排出連結翼管(2)を介した可動噴射攪拌翼(3)を装着した状態で軟弱地盤上に位置せしめ、可動噴射攪拌翼(3)の先端から回転削孔しながら排出工程と共に、下端の可動噴射攪拌翼(3)が右回転押圧片(11)に押圧されて可動し、固定吐出孔(13)の孔と可動吐出孔(10)が一致開孔し、内部よりの土質安定材を少量づつ噴出して軟弱地盤とを攪拌混合して拡大した径の造成柱を所定深度まで下降しながら順次形成して一応外周硬化層(19)を改良完成させる。次に図9に示す如く、所定深度から左回転で徐々に引き抜き上昇回転すると、該可動噴射攪拌翼(3)の回転翼片(9)が左回転押圧片(12)に押し廻しされ、該可動吐出孔(10)と固定吐出孔(13)との貫通が閉孔され、土質安定材は噴出が停止され、停止された安定材は、排出連結翼管(2)の内部注入部(5)を経た上部吐出孔(6)より外部噴出するため排土された内部に均等に適合量の土質安定材を注入混合して内部に内周硬化層(20)を上昇しながら残土に対応した硬化量を調整して改良造成するものである。
以上説明したものは、標準的な軟弱地盤における地盤改良工法であるが、特殊な条件下の場合は、当然安定材の配合量を多量としたり、数回に亘って注入、混合等の作業を繰り返すこともある。
【0006】
【実施例】
次にこの発明の一実施例を図面について説明すると、上端に各種装置を具備した駆動機構(18)を装設した大小各種の径よりなるスクリュー式の中空ロッド(1)を有し、この中空ロッド(1)には、下端翼片を設けた排出連結翼管(2)を有し、この排出連結翼管(2)には、内部に各種形状の通行する注入路(5)を有し、外周の上部に弾性体等よりなる排出弁(7)を設けた上部吐出孔(6)を穿設すると共に、外周の所定個所に数段の水平攪拌翼(17)(17)を突設形成してある。
次に、該排出連結翼管(2)の下部には、内部の固定排出筒体(4)と、その外周に可動噴射攪拌翼(3)を連結してある。該可動噴射攪拌翼(3)には、外周に数個の回転翼片(9)(9)を装設すると共に、一ヶ所に可動吐出孔(10)を穿設してある。
前記固定排出筒体(4)は、該可動噴射攪拌翼(3)の内部に位置し、上部に該排出連結翼管(2)と連結する接続部(14)と下方に該可動吐出孔(10)と一致する固定吐出孔(13)を穿設してある。
次に、該固定排出筒体(4)には、排出連結翼管(2)と共に回転する上端所定個所に左右の回動時に該可動噴射攪拌翼(3)を回動せしめる右回転押圧片(11)を左回転押圧片(12)とを所定間隔を設けて各々該回転翼片(9)(9)に押圧接触するように屈曲状態で突設形成してある。符号(8)は、該中空ロッド(1)の下端に排出連結翼管(2)を連結する上部接続部を示し、(15)は該回転翼片(9)(9)の下端に設けた掘削刃を示し、(16)は、該可動噴射攪拌翼(3)の下端に突設して設けた先端掘削翼である。
【0007】
【発明の効果】
この発明は、以上説明した如く、この地盤改良工法によれば、下降時には下端の先端のみの可動吐出孔より安定材を噴出攪拌し、上昇時には、下部の可動吐出孔を閉鎖して土質安定材の排出を停止し、上部の上部吐出孔のみから安定材を適量排出して造成柱を形成することによって、造成柱の圧密を均等に造成でき、従来の如く、昇降工程中に常時土質安定材噴出攪拌して造成柱を形成するものの如く、造成柱が完成後に噴射した安定材の増量による膨張等の不均等により側方の土壌を押圧し、隣接する水道管、ガス管及びその他の埋設物を容易に破損せしめることがない優れた特性がある。
そして、排出連結翼管に連結した可動可能な可動噴射攪拌翼の内部に固定排出筒体を挿嵌したことにより左右回転昇降の際に可動吐出孔と内部の固定吐出孔が簡単容易に開閉調整できると云う優れた便利な効果がある。
更に、固定排出筒体と共に可動する右回転押圧片と左回転押圧片とを装設してあるので、可動噴射攪拌翼の回転翼片を確実軽快に押圧可動せしめると云う優れた効果がある。
また、可動噴射攪拌翼に穿設した可動吐出孔と、固定排出筒体に穿設した固定吐出孔とによって、非常に簡単な構造で開孔及び閉孔ができ、別個の弁体を使用しないので故障等の破損は皆無であると云う効果もある。
【図面の簡単な説明】
【図1】 この発明の中空ロッドの下端の右回転状態の噴射攪拌翼部分の一部欠除した正面図であ
る。
【図2】 同じく左回転状態の噴射攪拌翼部分の一部欠除した正面図である。
【図3】 同じくこの発明の可動噴射攪拌翼の一部欠除した部分と固定排出筒体との分離状態の正
面図である。
【図4】 同じくこの発明の可動噴射攪拌翼の正面図である。
【図5】 同じく可動噴射攪拌翼の右回転押圧片の作用の一部欠除した斜面図である。
【図6】 同じく左回転押圧片の作用の一部欠除した斜面図である。
【図7】 同じく排出連結翼管の一部に設けた上部吐出孔を設けた状態の一部欠除した縦断側面図
である。
【図8】 同じくこの発明の下降造成状態を示す縦断側面図である。
【図9】 同じく上昇造成状態を示す縦断側面図である。
【符号の説明】
1 中空ロッド
2 排出連結翼管
3 可動噴射攪拌翼
4 固定排出筒体
6上部吐出孔
9 回転翼片
10 可動吐出孔
11 右回転押圧片
12 左回転押圧片
13 固定吐出孔
14 接続部
17 水平攪拌翼
18 駆動機構[0001]
[Industrial application fields]
The present invention relates to a ground improvement method in which a proper amount is efficiently adjusted on average by changing the position of the discharge hole of the stabilizer depending on the place where the screw-type rotating rod is stirred and used in various soft grounds, thereby forming a built column. It is.
[0002]
[Prior art]
In general, there are various methods for improving the ground by injecting, mixing and stirring while raising and lowering a soil stabilizer on this kind of soft ground.
However, these are equipped with a jet stirrer at the lower end of the hollow rod and stirred and mixed down to a predetermined depth while injecting and jetting the curing stabilizer, forming a cylindrical first cured layer, After that, the soil stabilization material is injected by injection injection from the lower end injection stirrer while gradually pulling up and rotating from a predetermined depth, and it is usually mixed uniformly into the hollow interior to create an improved ground column with a predetermined diameter Has been implemented.
[0003]
[Problems to be solved by the invention]
Conventionally, in this kind of soft ground improvement, it was formed when forming the modeling main pillar while injecting a stable solidified material continuously from the stirring injector during the lifting and lowering action by the stirring injector by the rotating rod. The internal density of the main pillar is large and the modeling pillar is in an expanded state, and gas pipes, water pipes, and other various buried objects buried in the vicinity or adjacent areas are pressed and bent from the side or damaged. There was a problem that many damages occurred.
The present invention has been made in view of the above-described problems of the above-described technology, and the main object thereof is an earth removal type ground improvement method, which is a right-handed stirring in a descending process. At the time of discharging, a part of the soil inside is discharged, the movable discharge hole of the movable jet stirring blade at the lower end opens in alignment with the internal fixed discharge hole, and the soil stabilization material is ejected and mixed to create and rise At the time of left-handed stirring in the process, the movable jet stirring blade is moved in the opposite direction, the movable discharge hole and the fixed discharge hole are closed, and the soil stabilization material is discharged and mixed from the upper discharge hole provided in the upper part to moderately It is intended to provide a ground improvement method that does not damage adjacent buried objects in the ground by adjusting to a stable density.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, according to the ground improvement method of the present invention, a screw-type rod having a drive mechanism installed at the top thereof is connected to a discharge connecting blade pipe having an upper discharge hole below and a movable jet at its lower end. Connect the stirring blade. It was inserted inside the stationary discharge tube body bored fixed discharge hole which connects with said discharge connecting wing pipe of the movable injection stirring blade, matching the moving discharge hole and the fixed discharge hole to the outer periphery of the movable injection stirring blade And a rotor blade is formed on the outer periphery. In addition, the fixed discharge cylinder is provided with a right rotation pressing piece and a left rotation pressing piece at predetermined intervals on the outer periphery of the upper portion.
When the hollow rod to be earthed is lowered, when the right rotation pressing piece presses the rotary blade piece, the movable discharge hole and the internal fixed discharge hole coincide with each other, and the earth stabilization material is lowered while being spouted and stirred. Thus, a primary hardened layer is formed. Next, the left rotation pressing piece movable together with the fixed discharge cylinder by reverse rotation without discharging the hollow rod presses a part of the rotary blade piece, thereby closing the fixed discharge hole and the movable discharge hole, This is an improved construction method in which a secondary hardened layer is formed inside the forming column by discharging the soil stabilizer from the upper discharge hole provided in the discharge connecting blade pipe.
[0005]
[Action]
The present invention has the above-described configuration. Now, the usage of this improved construction method will be described with reference to FIGS. 8 and 9. The discharge connecting blade pipe (2) is provided at the lower end of the screw-type rotary rod (1) for discharge. The movable jet agitating blade (3) at the lower end of the movable jet agitating blade (3) is positioned on the soft ground with the movable jet agitating blade (3) interposed therebetween, and at the lower end of the movable jet agitating blade (3) along with the discharging process while rotating from the tip of the movable jet agitating blade (3). It is pressed and moved by the right rotation pressing piece (11) , the hole of the fixed discharge hole (13) and the movable discharge hole (10) are coincidentally opened, and the soil stabilization material from the inside is ejected little by little, and the soft ground The formed peripheral pillars having a diameter expanded by stirring and mixing are sequentially formed while descending to a predetermined depth, and the outer peripheral hardened layer (19) is improved and completed. Next, as shown in FIG. 9, when the left and right rotations are gradually extracted and rotated from a predetermined depth, the rotary blade piece (9) of the movable jet stirring blade (3) is pushed around the left rotation pressing piece (12), The penetration of the movable discharge hole (10) and the fixed discharge hole (13) is closed, the ejection of the soil stabilization material is stopped, and the stopped stabilization material is the internal injection part (5) of the discharge connection blade pipe (2). In order to eject from the upper discharge hole (6) having undergone), an appropriate amount of soil stabilizer was injected and mixed evenly into the discharged soil, and the inner hardened layer (20) was raised inside to accommodate the remaining soil. The amount of curing is adjusted and improved.
What has been described above is the ground improvement method for standard soft ground, but under special conditions, naturally the amount of stabilizer should be increased or the injection, mixing, etc. work several times. Sometimes it repeats.
[0006]
【Example】
Next, an embodiment of the present invention will be described with reference to the drawings. A screw-type hollow rod (1) having various diameters and having a drive mechanism (18) equipped with various devices at its upper end is provided. The rod (1) has a discharge connection blade pipe (2) provided with a lower end blade piece. The discharge connection blade pipe (2) has an injection passage (5) through which various shapes pass. An upper discharge hole (6) provided with a discharge valve (7) made of an elastic body or the like is formed in the upper part of the outer periphery, and several horizontal stirring blades (17) and (17) are provided at predetermined positions on the outer periphery. It is formed.
Next, an internal fixed discharge cylinder (4) is connected to the lower part of the discharge connecting blade pipe (2), and a movable jet stirring blade (3) is connected to the outer periphery thereof. The movable jet agitating blade (3) is provided with several rotary blade pieces (9) and (9) on the outer periphery and a movable discharge hole (10) in one place.
The fixed discharge cylinder (4) is located inside the movable jet agitating blade (3), and has an upper connection portion (14) connected to the discharge connection blade tube (2) and a lower movable discharge hole ( A fixed discharge hole (13) corresponding to 10) is formed.
Next, the fixed discharge cylinder (4) has a right rotation pressing piece (3) that rotates the movable jet agitating blade (3) when rotating left and right at a predetermined upper end rotating together with the discharge connecting blade pipe (2). 11) and the left rotating pressing piece (12) are provided in a bent state so as to be in press contact with the rotating blade pieces (9) and (9) at predetermined intervals. Reference numeral (8) indicates an upper connecting portion for connecting the discharge connecting blade pipe (2) to the lower end of the hollow rod (1), and (15) is provided at the lower ends of the rotary blade pieces (9) (9). The excavating blade is shown, and (16) is a tip excavating blade provided protruding from the lower end of the movable jet stirring blade (3).
[0007]
【The invention's effect】
As described above, according to the ground improvement method , the present invention, when descending, stirs and stirs the stabilizer from the movable discharge hole only at the lower end, and closes the lower movable discharge hole to close the soil stabilization material. By stopping the discharge of water and discharging a proper amount of stabilizer from only the upper discharge hole at the upper part to form a built-up column , it is possible to create compaction of the built-up column evenly. as but forms a jet stirred to reclamation pillar presses the soil laterally by unequal expansion, etc. Establishment pillar by increasing the injection and stable material after completion, the adjacent water pipes, gas pipes and other buried objects Has excellent characteristics that will not easily break.
The fixed discharge cylinder is inserted into the movable movable jet agitating blade connected to the discharge connection blade tube, so that the movable discharge hole and the internal fixed discharge hole can be easily opened and closed during left and right rotation. It has an excellent and convenient effect that it can be done.
Further, since the right rotation pressing piece and the left rotation pressing piece that move together with the fixed discharge cylinder are installed, there is an excellent effect that the rotation blade piece of the movable jet stirring blade can be surely and easily moved.
Moreover, the movable discharge hole drilled in the movable jet agitating blade and the fixed discharge hole drilled in the fixed discharge cylinder can be opened and closed with a very simple structure, and no separate valve body is used. Therefore, there is an effect that there is no damage such as failure.
[Brief description of the drawings]
FIG. 1 is a front view in which a part of a jet stirring blade portion in a right rotation state at a lower end of a hollow rod of the present invention is partially removed.
FIG. 2 is a front view in which a part of the jet agitating blade portion in the left rotation state is also omitted.
FIG. 3 is a front view of a separated state of a part from which a part of the movable jet stirring blade of the present invention is removed and a fixed discharge cylinder.
FIG. 4 is a front view of the movable jet stirring blade of the present invention.
FIG. 5 is a perspective view in which a part of the action of the right rotation pressing piece of the movable jet stirring blade is also omitted.
FIG. 6 is a perspective view in which a part of the operation of the left rotation pressing piece is also omitted.
FIG. 7 is a side view of a longitudinal section with a part of a state where an upper discharge hole provided in a part of the discharge connecting blade tube is provided.
FIG. 8 is a longitudinal side view showing the descending formation state of the present invention.
FIG. 9 is a longitudinal sectional side view showing the rising formation state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13463795A JP3671280B2 (en) | 1995-04-24 | 1995-04-24 | Ground improvement method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13463795A JP3671280B2 (en) | 1995-04-24 | 1995-04-24 | Ground improvement method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08296220A JPH08296220A (en) | 1996-11-12 |
JP3671280B2 true JP3671280B2 (en) | 2005-07-13 |
Family
ID=15133032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13463795A Expired - Lifetime JP3671280B2 (en) | 1995-04-24 | 1995-04-24 | Ground improvement method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3671280B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003074054A (en) * | 2001-08-30 | 2003-03-12 | Asahi Kasei Corp | Steel pipe pile |
JP4942025B2 (en) * | 2006-08-16 | 2012-05-30 | 株式会社サムシング | Hollow tube structure and method for forming columnar solidified pile |
-
1995
- 1995-04-24 JP JP13463795A patent/JP3671280B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH08296220A (en) | 1996-11-12 |
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