JPH0438320A - Ground improving device - Google Patents
Ground improving deviceInfo
- Publication number
- JPH0438320A JPH0438320A JP14161490A JP14161490A JPH0438320A JP H0438320 A JPH0438320 A JP H0438320A JP 14161490 A JP14161490 A JP 14161490A JP 14161490 A JP14161490 A JP 14161490A JP H0438320 A JPH0438320 A JP H0438320A
- Authority
- JP
- Japan
- Prior art keywords
- blade
- rotary shaft
- rotary
- blades
- excavating
- 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.)
- Granted
Links
- 238000003756 stirring Methods 0.000 claims description 27
- 238000013019 agitation Methods 0.000 claims 1
- 239000003381 stabilizer Substances 0.000 abstract description 13
- 239000002689 soil Substances 0.000 description 15
- 238000005553 drilling Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 238000009412 basement excavation Methods 0.000 description 11
- 239000007787 solid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は地盤改良装置に係り、特に地盤を掘削しながら
石灰系やセメント系等の化学安定材を地盤中に吐出し、
この吐出した化学安定材と切削土砂とを混合攪拌して柱
状の固結体を地盤中に形成するための地盤改良装置に関
する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a ground improvement device, and in particular, a device for discharging a chemical stabilizer such as lime-based or cement-based material into the ground while excavating the ground.
The present invention relates to a ground improvement device for mixing and stirring the discharged chemical stabilizer and cut earth to form columnar solid bodies in the ground.
従来の地盤改良装置として、例えば第７図に示すような
ものが知られている。この装置１は、駆動装置本体２の
下部にモータ等の駆動手段によって高速回転する回転シ
ャフト３を長く設け、この回転シャフト３の先端に穿孔
ビット４を設けると共に、この穿孔ビット４の上部近傍
に掘削翼５と攪拌翼６とを固設した構造のものである。As a conventional ground improvement device, one shown in FIG. 7, for example, is known. This device 1 has a long rotary shaft 3 that is rotated at high speed by a drive means such as a motor at the bottom of a drive device main body 2, and a drilling bit 4 is provided at the tip of the rotary shaft 3, and a drilling bit 4 is provided near the top of the drilling bit 4. It has a structure in which excavating blades 5 and stirring blades 6 are fixedly installed.
そして、回転シャフト３を作動することによって、まず
穿孔ビット４で地盤７に穴を開け、次いで掘削翼５の回
転力によって地盤７を掘り進むと共に、掘削した土と回
転シャフト３の掘削Ｈ５近傍位置に開設した小孔８から
吐出させた化学安定材とを攪拌翼６によって十分に混合
攪拌し、該掘削部位に化学安定材によって改良された柱
状の固結体１０を形成することて地盤を改良するもので
ある。Then, by operating the rotary shaft 3, first a hole is made in the ground 7 with the drilling bit 4, and then the ground 7 is dug by the rotational force of the drilling blade 5, and the excavated soil and the rotary shaft 3 are connected to a position near the excavation H5. The ground is improved by sufficiently mixing and agitating the chemical stabilizer discharged from the opened small hole 8 with the stirring blade 6 to form a columnar solid body 10 improved by the chemical stabilizer at the excavated site. It is something.
しかしながら、上記従来の地盤改良装置にあっては、掘
削翼５と攪拌翼６とが共に同一方向の仰角を有して回転
シャフト３に取付けられていたために、掘削翼５によっ
て掘られた土が塊のまま攪拌翼６と一緒に回転する、所
謂共回り現象が起こり、化学安定材との間で十分な混合
が行なわれないといった問題があった。However, in the conventional ground improvement device described above, since the excavating blades 5 and the stirring blades 6 are both attached to the rotating shaft 3 with elevation angles in the same direction, the soil dug by the excavating blades 5 is There was a problem that a so-called co-rotation phenomenon occurred in which the lumps rotated together with the stirring blade 6, and sufficient mixing with the chemical stabilizer was not achieved.
そこで、本発明の技術的課題は、掘削された土と化学安
定材との混合攪拌が十分に行なわれるようにして、地盤
の掘削部位に均質で強度の大きい固結体を形成できるよ
うにする点にある。Therefore, the technical problem of the present invention is to ensure that the excavated soil and the chemical stabilizer are sufficiently mixed and stirred to form a homogeneous and strong solid at the excavated site of the ground. At the point.
本発明は、上記技術的課題を解決するために、第１に駆
動装置本体の下部に回転シャフトを有し、この回転シャ
フトの先端部近傍に掘削翼と攪拌翼とを固設してなる地
盤改良装置において、上記回転シャフトの先端部近傍に
、掘削翼および攪拌翼とは逆の仰角を有する回転翼を回
転シャフトに対して回転自在に取付けた地盤改良装置を
手段とする。In order to solve the above-mentioned technical problems, the present invention firstly has a rotating shaft at the lower part of the driving device main body, and a ground cutting blade and a stirring blade are fixedly installed near the tip of the rotating shaft. The improvement device uses a ground improvement device in which a rotary blade having an angle of elevation opposite to that of the excavating blade and the stirring blade is attached near the tip of the rotary shaft so as to be freely rotatable with respect to the rotary shaft.
上述の手段によれば、回転シャフトに対して回転翼が回
転自在に取付けられている上、その仰角が掘削翼や攪拌
翼とは逆の関係になっているため、回転シャフトを正方
向に回転させながら掘削する場合および掘削終了後に回
転シャフトを逆方向に回転させて引き上げる場合のいず
れにあっても、回転翼は回転シャフトの回転方向とは逆
方向に回転することとなり、掘削した土と化学安定材と
の混合攪拌が十分に行なわれる。According to the above-mentioned means, the rotary blade is rotatably attached to the rotary shaft, and the angle of elevation thereof is in the opposite relationship to that of the excavating blade and stirring blade, so that the rotary shaft cannot be rotated in the forward direction. In either case, when excavating while moving the earth, or when pulling up by rotating the rotary shaft in the opposite direction after the excavation is completed, the rotor blades rotate in the opposite direction to the rotation direction of the rotary shaft, and the excavated soil and chemical Sufficient mixing and stirring with the stabilizer is carried out.
（実施例）
以下、添付図面に基づいて本発明の実施例を詳細に説明
する。(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.
第１図に示した地盤改良装置１１の一実施例において、
駆動装置本体２の下部には正逆二方向に回転する回転シ
ャフト３が長く延びている。そして、この回転シャフト
３の先端部には従来例と同様に穿孔ビット４が設けられ
、また穿孔ビット４の上部近傍には掘削翼５と攪拌翼６
とが回転シャフト３に固設されている。In one embodiment of the ground improvement device 11 shown in FIG.
A rotating shaft 3 that rotates in two directions, forward and reverse, extends in the lower part of the drive device main body 2. A drilling bit 4 is provided at the tip of the rotating shaft 3 as in the conventional example, and a drilling blade 5 and a stirring blade 6 are provided near the top of the drilling bit 4.
is fixed to the rotating shaft 3.
穿孔ビット４は先細形状の板状体で形成されており、ま
た掘削翼５及び攪拌翼６は共に水平方向に延びる四角形
状の板状体によって形成されているが、特に掘削翼５の
下端部には凹凸状の掘削刃１２が形成されている。そし
て、これら掘削翼５及び攪拌翼６は、回転シャフト３の
正方向の回転時に掘進するような仰角を以って回転シャ
フト３に固設されている。The drilling bit 4 is formed of a tapered plate-like body, and the drilling blades 5 and stirring blades 6 are both formed of rectangular plate-like bodies extending in the horizontal direction, especially the lower end of the drilling blade 5. An excavation blade 12 having an uneven shape is formed in the excavation blade 12 . The excavating blades 5 and stirring blades 6 are fixed to the rotating shaft 3 at an elevation angle such that they dig when the rotating shaft 3 rotates in the forward direction.
また、この実施例において攪拌翼６は掘削翼５の上部位
置で２段に設けられ、それらが互いに直交した形状とな
っているが、特に掘削翼５と下側攪拌翼６との間には回
転翼装置１３が設けられている。この回転翼装置１３は
、第１図及び第２図に示すように、回転シャフト３に遊
嵌された筒体１４と、この筒体１４の外周面に取付けら
れた一対の回転翼１５と、筒体１４の上下端近傍位置に
設けられたリング状のストッパ部１６ａ。In addition, in this embodiment, the stirring blades 6 are provided in two stages at the upper position of the excavating blade 5, and are perpendicular to each other. A rotary blade device 13 is provided. As shown in FIGS. 1 and 2, this rotary blade device 13 includes a cylindrical body 14 loosely fitted to the rotary shaft 3, a pair of rotary blades 15 attached to the outer peripheral surface of this cylindrical body 14, A ring-shaped stopper portion 16a is provided near the upper and lower ends of the cylindrical body 14.
１６ｂとて構成される。回転翼１５は上記撹拌翼６と同
一形状の板状体で形成されているが、上記掘削翼５及び
攪拌翼６の仰角とは反対方向の角度を以って水平方向に
取付けられている。なお、上記掘削翼５の近傍の回転シ
ャフト３には、セメント系や石灰系などの化学安定材を
吐出するための小孔８が開設されており、この小孔８は
回転シャフト３の内部に設けられた液体通路１７と接続
されている。16b. The rotary blade 15 is formed of a plate-shaped body having the same shape as the stirring blade 6, but is mounted horizontally at an angle opposite to the elevation angle of the digging blade 5 and stirring blade 6. A small hole 8 is provided in the rotary shaft 3 near the excavation blade 5 for discharging a chemical stabilizer such as cement or lime. It is connected to a liquid passage 17 provided therein.
従って、このような構成からなる地盤改良装置１１を用
いて軟弱地盤の改良施工を行なう場合には、まず第３図
に示すように、回転シャフト３を正方向に回転させ、穿
孔ビット４と掘削翼５の回転によって地盤を掘り進む。Therefore, when performing improvement work on soft ground using the ground improvement device 11 having such a configuration, first rotate the rotary shaft 3 in the forward direction as shown in FIG. The ground is dug by the rotation of the wings 5.
また、これと同時に小孔８からは液状の化学安定材を地
中に吐出する。掘削された土は、撹拌翼６によって次第
に化学安定材と混合攪拌されていくが、掘削が進むにつ
れて相対的に上方へ移動するので、その移動力で回転翼
１５の下面を押圧する。特に、回転翼１５か掘削翼５の
上部近傍に設けであるため、掘削翼５によって掘り起こ
された士て回転翼１５の下面を強く押圧することになる
。そして、回転翼１５は、掘削翼５や攪拌翼６とは反対
向きの仰角となっており、また筒体１４が回転シャフト
３とは回転自在となっているために、上記押圧力によっ
て逆方向の回転力が与えられることになり、掘削翼５や
攪拌翼６の回転方向に対して相対的に反対方向へ回転す
ることとなる。なお、回転翼１５が下方から押された時
、筒体１４の上端部かストッパ部１６ａに当たることで
、上方への移動が防止される。At the same time, a liquid chemical stabilizer is discharged into the ground from the small holes 8. The excavated soil is gradually mixed with the chemical stabilizer and stirred by the stirring blades 6, but as the excavation progresses, it moves relatively upward, and its moving force presses the lower surface of the rotary blade 15. In particular, since the rotary blade 15 is provided near the upper part of the excavating blade 5, when the excavating blade 5 excavates, the lower surface of the rotary blade 15 is strongly pressed. The rotary blades 15 have an elevation angle opposite to that of the excavating blades 5 and the stirring blades 6, and since the cylindrical body 14 is rotatable relative to the rotary shaft 3, the pressing force causes the rotary blades 15 to move in the opposite direction. A rotational force of 1 is applied to the excavator blade 5 and the stirring blade 6 to rotate in a direction relatively opposite to the rotational direction of the excavator blade 5 and the stirring blade 6. Note that when the rotary blade 15 is pushed from below, the upper end of the cylinder body 14 hits the stopper portion 16a, thereby preventing upward movement.
このように、回転翼１５が逆向きに回転することで、掘
削翼５によって掘られた土はまず回転翼１５によって逆
方向の力を受け、次いで攪拌翼６によって再び反対方向
の回転力が与えられるので、士が塊とならずによくほぐ
れ、化学安定材とも十分に混合攪拌されることとなる。As the rotor blades 15 rotate in the opposite direction, the soil dug by the excavation blades 5 is first subjected to a force in the opposite direction by the rotor blades 15, and then is again given a rotational force in the opposite direction by the stirring blades 6. As a result, the material is well loosened without forming lumps, and is thoroughly mixed and stirred with the chemical stabilizer.
一方、所定深度まで掘削が進んだことを確認したのち化
学安定材の吐出を停止し、今度は第４図に示すように、
回転シャフト３を掘削時とは逆方向に回転させて一定速
度で引き上げていく。この時は掘削時とは反対に土か相
対的に下方に移動し、これが下向きの力となって回転翼
１５の上面を押圧するので、回転翼１５は回転シャフト
３とは逆向きに回転することとなる。なお、筒体１４の
下方移動は下側のストッパ部１６ｂによって拘束される
。On the other hand, after confirming that the excavation had progressed to a predetermined depth, the discharge of chemical stabilizer was stopped, and this time, as shown in Figure 4,
The rotary shaft 3 is rotated in the opposite direction to that during excavation and pulled up at a constant speed. At this time, contrary to when excavating, the soil moves relatively downward, and this becomes a downward force that presses the upper surface of the rotor blade 15, so the rotor blade 15 rotates in the opposite direction to the rotary shaft 3. It happens. Note that the downward movement of the cylindrical body 14 is restricted by the lower stopper portion 16b.
その結果、回転シャフト３の引き上げ時にも再び土と安
定材との混合攪拌か十分に行なわれることとなり、第５
図に示すように回転シャフト３の引き上げが終了した時
点では、掘削部に均質に混合した良質の柱状固結体１０
が構築されることとなる。As a result, when the rotating shaft 3 is pulled up, the soil and the stabilizing material are sufficiently mixed and stirred again, and the fifth
As shown in the figure, when the lifting of the rotary shaft 3 is completed, the columnar solids 10 of good quality are homogeneously mixed in the excavated area.
will be constructed.
尚、上記実施例では回転翼１５を掘削翼５と攪拌翼６と
の間に配置した場合について説明したが、上下の攪拌翼
６同士の間に配置してもよく、また第６図に示したよう
に、掘削翼５と攪拌翼６との間、及び上下の攪拌翼６の
間に回転翼１５を多段に配置して、上記攪拌効果を高め
るようにしてもよい。In the above embodiment, the rotary blade 15 is arranged between the excavation blade 5 and the stirring blade 6, but it may also be placed between the upper and lower stirring blades 6, and as shown in FIG. Similarly, the rotary blades 15 may be arranged in multiple stages between the excavation blades 5 and the stirring blades 6 and between the upper and lower stirring blades 6 to enhance the stirring effect.
以上説明したように、本発明に係る地盤改良装置によれ
ば、掘削翼および撹拌翼とは逆方向に回転する回転翼を
設けたから、掘削した土か塊とならずによくほぐれ、化
学安定材との混合攪拌が十分に行なわれて、均質で強度
の大きな固結柱体を形成することができた。As explained above, according to the ground improvement device according to the present invention, since the rotary blades are provided that rotate in the opposite direction to the excavating blades and the stirring blades, the excavated soil can be loosened well without forming lumps, and the chemically stabilized soil can be easily loosened. The mixture was sufficiently mixed and stirred to form a homogeneous and strong solidified column.
また、本発明における回転翼は駆動力を用いず、回転シ
ャフトに対して自由回転する非常に簡単な構造である。Further, the rotor blade in the present invention has a very simple structure that rotates freely with respect to the rotary shaft without using a driving force.
第１図は本発明に係る地盤改良装置の一実施例を示す正
面図、第２図は第１図中の回転翼装置の拡大断面図、第
３図乃至第５図は地盤改良装置を用いた固結体の施工順
序を示す説明図、第６図は本発明に係る地盤改良装置の
他の実施例を示す正面図、第７図は従来の地盤改良装置
の一例を示す正面図である。
１．１１・・・地盤改良装置
２・・・装置本体
３・・・回転シャフト
５・・・掘削翼
６・・・攪拌翼
１３・・・回転翼装置
１５・・・回転翼Fig. 1 is a front view showing one embodiment of the soil improvement device according to the present invention, Fig. 2 is an enlarged sectional view of the rotary blade device in Fig. 1, and Figs. 3 to 5 show the use of the soil improvement device. FIG. 6 is a front view showing another embodiment of the soil improvement device according to the present invention, and FIG. 7 is a front view showing an example of the conventional soil improvement device. . 1.11...Soil improvement device 2...Device body 3...Rotating shaft 5...Drilling blade 6...Agitating blade 13...Rotary blade device 15...Rotating blade
Claims (1)
ャフトの先端部近傍に掘削翼と攪拌翼とを固設してなる
地盤改良装置において、 上記回転シャフトの先端部近傍に、掘削翼および攪拌翼
とは逆の仰角を有する回転翼を回転シャフトに対して回
転自在に取付けたことを特徴とする地盤改良装置。[Scope of Claims] A ground improvement device comprising a rotating shaft at the lower part of the driving device body, and an excavating blade and an agitation blade fixed near the tip of the rotating shaft, wherein: A ground improvement device characterized in that a rotary blade having an angle of elevation opposite to that of the excavating blade and the stirring blade is rotatably attached to a rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141614A JP2600011B2 (en) | 1990-06-01 | 1990-06-01 | Ground improvement equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141614A JP2600011B2 (en) | 1990-06-01 | 1990-06-01 | Ground improvement equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0438320A true JPH0438320A (en) | 1992-02-07 |
| JP2600011B2 JP2600011B2 (en) | 1997-04-16 |
Family
ID=15296129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2141614A Expired - Fee Related JP2600011B2 (en) | 1990-06-01 | 1990-06-01 | Ground improvement equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600011B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008057255A (en) * | 2006-08-31 | 2008-03-13 | Kokudo Sogo Kensetsu Kk | Relative agitator for deep mixing processing and deep mixing method of soil stabilization |
| JP2010059689A (en) * | 2008-09-04 | 2010-03-18 | Arata Kogyo Kk | Soil improving apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428205U (en) * | 1977-07-29 | 1979-02-23 | ||
| JPS5428205A (en) * | 1977-08-05 | 1979-03-02 | Furukawa Electric Co Ltd:The | Preventing device for oxidation of molten metal |
| JPS56153013A (en) * | 1980-04-28 | 1981-11-26 | Tenotsukusu:Kk | Stirring blade device for composite head in subsoil improvement |
| JPS6282114A (en) * | 1985-10-07 | 1987-04-15 | Kenken Kogyo Kk | Forced stirring device for excavated earth on ground-improving machine |
| JPS62264212A (en) * | 1986-04-16 | 1987-11-17 | Asou Form Kuriito Kk | Ground improving work |
| JPS646409A (en) * | 1987-06-26 | 1989-01-11 | Kazuharu Fujito | Co-rotation preventive forced stirrer |
-
1990
- 1990-06-01 JP JP2141614A patent/JP2600011B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428205U (en) * | 1977-07-29 | 1979-02-23 | ||
| JPS5428205A (en) * | 1977-08-05 | 1979-03-02 | Furukawa Electric Co Ltd:The | Preventing device for oxidation of molten metal |
| JPS56153013A (en) * | 1980-04-28 | 1981-11-26 | Tenotsukusu:Kk | Stirring blade device for composite head in subsoil improvement |
| JPS6282114A (en) * | 1985-10-07 | 1987-04-15 | Kenken Kogyo Kk | Forced stirring device for excavated earth on ground-improving machine |
| JPS62264212A (en) * | 1986-04-16 | 1987-11-17 | Asou Form Kuriito Kk | Ground improving work |
| JPS646409A (en) * | 1987-06-26 | 1989-01-11 | Kazuharu Fujito | Co-rotation preventive forced stirrer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008057255A (en) * | 2006-08-31 | 2008-03-13 | Kokudo Sogo Kensetsu Kk | Relative agitator for deep mixing processing and deep mixing method of soil stabilization |
| JP2010059689A (en) * | 2008-09-04 | 2010-03-18 | Arata Kogyo Kk | Soil improving apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2600011B2 (en) | 1997-04-16 |
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