JP2842771B2 - Knotted soil cement column construction equipment - Google Patents
Knotted soil cement column construction equipmentInfo
- Publication number
- JP2842771B2 JP2842771B2 JP5255591A JP25559193A JP2842771B2 JP 2842771 B2 JP2842771 B2 JP 2842771B2 JP 5255591 A JP5255591 A JP 5255591A JP 25559193 A JP25559193 A JP 25559193A JP 2842771 B2 JP2842771 B2 JP 2842771B2
- Authority
- JP
- Japan
- Prior art keywords
- drilling
- blade
- ground
- excavation
- shaft
- 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
Links
Description
【０００１】[0001]
【産業上の利用分野】軟弱地盤に対して、充填剤を機械
的に混合して固結する、深層地盤の改良や、地盤を補強
する補強土工法の築造装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep ground improvement apparatus for mechanically mixing and solidifying a filler into a soft ground, and a construction apparatus using a reinforced earth method for reinforcing the ground.
【０００２】[0002]
【従来の技術】従来は、既に特公昭５８−２９３７４号
で公告されているような、地盤を円柱状に改良する装置
が用いられた。即ち図５に示すように、掘削軸に掘削翼
と数段の撹拌翼を設ける。更に掘削翼と撹拌翼の間に、
掘削軸の回転に対して回転自由な、掘削径より大きい径
を有する共廻り防止装置を嵌入せしめて、更に該共廻り
防止装置の上下の移動を拘束する。掘削軸を回転させて
掘進させると、共廻り防止翼は地盤の抵抗により、回転
を停止し掘削翼が掘削した土壌の掘削翼との共廻りを防
止する。砂質土系の地盤では共廻り防止装置がなくても
問題ないが、粘性土やピート層では掘進に従って改良し
ようとする地盤が撹拌翼と共廻りして充分な撹拌が得ら
れなかったが、共廻り防止装置によって強制的に共廻り
が防止出来るため、掘削軸内に設けた流路から注入され
る充填剤とよく撹拌され、粘性土、ピート層地盤でも均
一な地盤改良が出来るものであった。2. Description of the Related Art Conventionally, there has been used an apparatus for improving the ground into a columnar shape, which has already been announced in Japanese Patent Publication No. 58-29374. That is, as shown in FIG. 5, the excavating shaft is provided with excavating blades and several stages of stirring blades. Furthermore, between the drilling wing and the stirring wing,
A co-rotation prevention device having a diameter larger than the excavation diameter, which is rotatable with respect to the rotation of the excavation shaft, is fitted, and furthermore, the vertical movement of the co-rotation prevention device is restricted. When the excavation shaft is rotated and excavated, the co-rotation prevention wing stops rotation due to the resistance of the ground and prevents the excavation wing from co-rotating with the excavation wing of the soil excavated. In sandy soil, there is no problem even if there is no co-rotation prevention device, but in cohesive soil or peat layer, the ground to be improved according to excavation did not rotate enough with the stirring blade, and sufficient stirring was not obtained, Since the co-rotation prevention device can forcibly prevent the co-rotation, it is well stirred with the filler injected from the flow channel provided in the excavation shaft, and the soil can be uniformly improved even with cohesive soil and peat layer ground. Was.
【０００３】[0003]
【発明が解決しようとする課題】しかし前述のような地
盤改良法では、改良地盤が単純な円柱形を形成している
ため、該円柱形の外周の未改良地盤との摩擦力が小さ
く、一層の地盤改良を検討する余地があった。すなわ
ち、円柱形の改良地盤を直交接触配置とすれば、平面的
に見て改良された円形地盤の占める割合は図２（ｂ）に
示すように７８．５％となり、７８．５％が実質的な地
盤改良率となった。改良率を高めようとすると、円柱掘
削をラップさせねばならず、効率も経済性もよくない。
本発明は、このような問題点を考慮して図３に示すよう
な円柱の節部分を形成するようにし、円柱形の改良地盤
の引き抜き力や鉛直力に対する外周抵抗を図４に示すよ
うに増大させ、かつ平面的に見て図２（ａ）に示すよう
に、従来の７８．５％以上の地盤改良率を得るように工
夫したものである。However, in the above-described ground improvement method, since the improved ground has a simple columnar shape, the frictional force of the outer periphery of the columnar shape with the unimproved ground is small, and the ground is further improved. There was room to consider ground improvement. That is, if the cylindrical improved ground is arranged in orthogonal contact, the ratio of the improved circular ground in plan view is 78.5% as shown in FIG. 2 (b), and 78.5% is substantially Land improvement rate. In order to increase the rate of improvement, the cylindrical excavation must be wrapped, which is not efficient or economical.
In consideration of such a problem, the present invention forms a columnar node as shown in FIG. 3, and the outer peripheral resistance to the pulling force and the vertical force of the improved columnar ground is shown in FIG. 4. As shown in FIG. 2 (a) when viewed in plan and increased, a ground improvement ratio of 78.5% or more is obtained.
【０００４】[0004]
【課題を解決するための手段】充填剤の流路をもった掘
削軸の先端に掘削翼を取着し、該掘削翼の上部に数段の
撹拌翼を取着する。前記翼の間に掘削径Ｄa より大きい
径Ｄb を持つ掘削撹拌翼を掘削軸に嵌入する。掘削撹拌
翼の上部には、ストッパを、下部には、掘削撹拌翼が下
方に移動して正転する場合、該掘削撹拌翼に設けたクラ
ッチと噛み合い逆転した場合は、スリップするクラッチ
を掘削軸上に取着して装置を構成する。A digging blade is attached to the tip of a digging shaft having a flow path of a filler, and several stages of stirring blades are mounted on the upper part of the digging blade. Fitting the drilling stirring blade having a drilling diameter D a larger diameter D b between the wings drilling axis. A stopper is provided at the upper part of the excavating agitating blade, and a lower clutch is engaged with the clutch provided on the excavating agitating blade when the excavating agitating blade moves downward and rotates forward when the excavating agitating blade is rotated reversely. Attached to the top to configure the device.
【０００５】なお、掘削撹拌翼には掘削径Ｄa より大き
い径Ｄb の部分に上向きの掘削爪と側方には、横向きの
掘削爪を設けると効果的である。[0005] Incidentally, the upward drilling claws and laterally portions of the drilling diameter D a larger diameter D b is the drilling stirring blade, it is effective to provide a lateral excavation teeth.
【０００６】[0006]
【実施例】以下本発明を図１の実施例について詳細に説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiment of FIG.
【０００７】掘削軸１には充填剤の流路と吐出口２を設
け、先端に掘削翼３が取着してある。該掘削翼３には掘
削爪４が設けてあり、掘削軸１を回転させながら掘削翼
３も回転し、掘削爪４で地盤を掘進する。掘削された土
壌は、注入された充填剤と、前記掘削軸１の上位に取着
された撹拌翼５で充分撹拌されながら掘進するが、地盤
が粘性土或いはピート層等の場合は、掘削翼３及び撹拌
翼５と土壌が共廻りして撹拌が充分でない。これを補う
ため、この例では掘削翼３の上部の撹拌翼５との間に掘
削円柱径Ｄa よりやや大きい径Ｄb の掘削撹拌翼６を掘
削軸１に嵌入し、掘削進行時は、掘削軸１に取着したス
トッパ７で前記掘削撹拌翼６は、地盤に食い込み回転は
止まり、掘削翼３の回転と相いまって掘削された土壌
は、掘削翼３と共廻りせず、充填剤との撹拌が完全に行
われる。掘進終了後、掘削軸１を回転させながら引き抜
こうとすると、掘削軸１に取着したクラッチ８と掘削撹
拌翼に設けられたポス部のクラッチ９が噛み合い、撹拌
翼５と反対側に傾斜した掘削撹拌翼６の先端に設けた掘
削爪１０及び横向きの掘削爪１１によって、初期の円柱
径Ｄa よりも大きい円柱径Ｄb の範囲が掘削され地盤改
良される。掘削軸１を逆回転させて、引き抜こうとすれ
ば掘削撹拌翼６のクラッチ８，９はスリップし、掘削撹
拌翼６は若干のスリップ幅で上下はするが、掘削軸１と
共には回転せず掘削土壌の共廻り防止機能を果たしなが
ら、初期の掘削径Ｄa で引き抜かれる。An excavating shaft 1 is provided with a flow path and a discharge port 2 for a filler, and an excavating blade 3 is attached to a tip thereof. The excavating wing 3 is provided with an excavating claw 4. The excavating wing 3 is also rotated while rotating the excavating shaft 1, and the excavation claw 4 excavates the ground. The excavated soil excavates while being sufficiently stirred by the injected filler and the impeller 5 attached above the excavation shaft 1. When the ground is a viscous soil or a peat layer, the excavated soil is excavated. 3 and the stirring blade 5 and the soil rotate together, and the stirring is not sufficient. To compensate for this, in this example it fitted drilling stirring blade 6 of slightly larger diameter D b than drilling cylinder diameter D a between the stirring blade 5 of the upper part of the drilling blade 3 in the drilling shaft 1, during excavation progress, With the stopper 7 attached to the excavation shaft 1, the excavation stirring blade 6 bites into the ground and stops rotating, and the soil excavated in conjunction with the rotation of the excavation blade 3 does not rotate with the excavation blade 3, and is filled. Stirring with the agent is completed. When the drilling shaft 1 is rotated and pulled out after completion of the excavation, the clutch 8 attached to the excavation shaft 1 and the boss portion clutch 9 provided on the excavation stirring blade engage with each other, and the excavation inclined to the opposite side to the stirring blade 5 is performed. the excavation teeth 10 and lateral excavation teeth 11 provided at the tip of the stirring blade 6, the range of large cylindrical diameter D b than the initial cylindrical diameter D a is improved excavated soil. If the drilling shaft 1 is rotated in the reverse direction to pull out, the clutches 8 and 9 of the drilling and stirring blade 6 slip, and the drilling and stirring blade 6 moves up and down with a slight slip width, but does not rotate with the drilling shaft 1 and excavates. while playing a co-around protection of soil, it is withdrawn at an initial drilling diameter D a.
【０００８】このように掘削軸１の回転方向を制御しな
がら、掘削径よりも大きい節状の部分を有する地盤改良
柱体を築造出来る。図２は従来の地盤改良率と本発明に
よる地盤改良率を平面的に比較したものであり、図３は
本発明による改良地盤の立面図である。未改良部分を３
軸方向に改良地盤で囲むため効率のよい地盤改良を行う
ことが出来る。As described above, it is possible to construct a ground improvement column having a node-like portion larger than the excavation diameter while controlling the rotation direction of the excavation shaft 1. FIG. 2 is a plan view comparing the conventional ground improvement rate and the ground improvement rate according to the present invention, and FIG. 3 is an elevation view of the improved ground according to the present invention. 3 unmodified parts
Since the ground is surrounded by the improved ground in the axial direction, efficient ground improvement can be performed.
【０００９】[0009]
【発明の効果】本発明の効果は、円柱形の地盤改良領域
に加えて、節状の部分を有する地盤改良が出来るので、
従来の単純な円柱形の地盤改良時よりも、改良地盤の引
き抜き力や、鉛直力に対して抵抗が大きくなる。The effect of the present invention is that, in addition to the columnar ground improvement area, the ground improvement having the node-like portions can be performed.
The resistance to the pulling-out force and the vertical force of the improved ground is greater than in the conventional simple cylindrical ground improvement.
【００１０】また、地盤を３次元的に改良するので、実
質的に地盤改良率が向上することになる。Also, since the ground is improved three-dimensionally, the ground improvement rate is substantially improved.
【図１】本発明のソイルセメントコラム築造装置を示す
図である。FIG. 1 is a view showing a soil cement column building apparatus of the present invention.
【図２】（ａ）本発明の装置による改良地盤を示す平面
図である。 （ｂ）従来装置による改良地盤を示す平面図である。FIG. 2 (a) is a plan view showing an improved ground by the apparatus of the present invention. (B) It is a top view which shows the improved ground by the conventional apparatus.
【図３】本発明の装置による改良地盤の立面図を示す。FIG. 3 shows an elevation view of an improved ground with the device of the invention.
【図４】（ａ）本発明の装置による改良地盤が鉛直力に
強い抵抗を示す図である。 （ｂ）本発明の装置による改良地盤が引き抜き力に強い
抵抗を示す図である。FIG. 4 (a) is a diagram showing that the improved ground by the device of the present invention has a strong resistance to vertical force. (B) The improved ground by the device of the present invention shows a strong resistance to the pulling force.
【図５】従来のソイルセメントコラム築造装置を示す図
である。FIG. 5 is a view showing a conventional soil cement column building apparatus.
１・・・掘削軸、２・・・充填剤吐出口、３・・・掘削
翼、４・・・掘削爪、５・・・撹拌翼、６・・・掘削撹
拌翼、７・・・ストッパ、８・・・クラッチ、９・・・
クラッチ、１０・・・掘削爪、１１・・・掘削爪DESCRIPTION OF SYMBOLS 1 ... Drilling axis, 2 ... Filler discharge port, 3 ... Drilling blade, 4 ... Drilling claw, 5 ... Stirring blade, 6 ... Drilling stirring blade, 7 ... Stopper , 8 ... clutch, 9 ...
Clutch, 10 digging claw, 11 digging claw
Claims (2)
削翼を取着し、該掘削翼の上部に少なくとも１段の撹拌
翼を取着し、前記翼の間に掘削径より大きい径を持つ掘
削撹拌翼を掘削軸に嵌入し、該掘削撹拌翼の上部掘削軸
には、ストッパを設け下部には掘削撹拌翼が下方に移動
した場合、該掘削撹拌翼に設けたクラッチと噛み合うク
ラッチを取着してなることを特徴とする節付きソイルセ
メントコラム築造装置。An excavator blade is attached to a tip of an excavator shaft having a flow path of a filler, and at least one stage impeller is attached to an upper portion of the excavator blade. When a drilling agitating blade having a large diameter is inserted into a drilling shaft, a stopper is provided on an upper drilling shaft of the drilling agitating blade, and a clutch provided on the drilling agitating blade is provided when the drilling agitating blade moves downward at a lower portion. A knitted soil cement column construction device characterized by attaching a meshing clutch.
掘削爪を備えた請求項１記載の節付きソイルセメントコ
ラム築造装置。2. The node-equipped soil cement column construction apparatus according to claim 1, wherein the excavation stirring blade is provided with upward and / or sideways excavation claws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255591A JP2842771B2 (en) | 1993-10-13 | 1993-10-13 | Knotted soil cement column construction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255591A JP2842771B2 (en) | 1993-10-13 | 1993-10-13 | Knotted soil cement column construction equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07109732A JPH07109732A (en) | 1995-04-25 |
| JP2842771B2 true JP2842771B2 (en) | 1999-01-06 |
Family
ID=17280859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5255591A Expired - Lifetime JP2842771B2 (en) | 1993-10-13 | 1993-10-13 | Knotted soil cement column construction equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2842771B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3673977B2 (en) * | 1996-04-17 | 2005-07-20 | 大成建設株式会社 | Construction method of water-stopping mountain retaining wall |
| JP3373488B2 (en) * | 2000-08-18 | 2003-02-04 | 株式会社テノックス | Road construction |
| JP5652972B1 (en) * | 2013-07-11 | 2015-01-14 | 株式会社Ｊｆｄエンジニアリング | Ground improvement device |
| JP6208502B2 (en) * | 2013-09-10 | 2017-10-04 | 株式会社テノックス九州 | Drilling and stirring device with co-rotation prevention wing |
| JP2022015199A (en) * | 2020-07-08 | 2022-01-21 | 株式会社テノックス九州 | Drilling and agitating device and construction method for soil improver using the same |
| CN113006036B (en) * | 2021-03-20 | 2022-04-19 | 恒亿集团有限公司 | Construction method of prestressed bamboo joint pipe pile shallow curing composite foundation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5149123B2 (en) * | 1971-08-10 | 1976-12-24 | ||
| JPH077383Y2 (en) * | 1988-11-28 | 1995-02-22 | 近畿イシコ株式会社 | Earth auger |
| JPH0819672B2 (en) * | 1989-02-14 | 1996-02-28 | 株式会社ジオトップ | Earth auger |
-
1993
- 1993-10-13 JP JP5255591A patent/JP2842771B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07109732A (en) | 1995-04-25 |
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