JP2023160269A

JP2023160269A - Ground improvement device

Info

Publication number: JP2023160269A
Application number: JP2022070500A
Authority: JP
Inventors: 敏樹石井; Toshiki Ishii; 延明関根; Nobuaki Sekine
Original assignee: Onoda Chemico Co Ltd; Sanwa Kizai Co Ltd
Current assignee: Onoda Chemico Co Ltd; Sanwa Kizai Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2023-11-02

Abstract

To solve the conventional problem in which: the grounding cross section of a ground to be improved is circular, resulting in a low supporting load, and an agitation area in the longitudinal direction by an excavation agitation device is narrow, resulting in low agitation efficiency.SOLUTION: In a ground improvement device, a case 17 is provided at a lower part of a hanging frame 5 of an excavation agitation device 4 attached to an arm 2 of a base machine 1 that can freely travel, and the case 17 is provided with a pair of front and rear side excavation agitation portions 10 having a pair of left and right side excavation agitation bodies 20. The front and rear side excavation agitation portions 10 are configured to mutually rotate in forward and reverse directions with two hydraulic motors 21 and 22 to relatively agitate the ground.SELECTED DRAWING: Figure 3

Description

本発明は、地盤改良装置に係るものである。 The present invention relates to a ground improvement device.

従来、走行自在なベースマシンのアームに取付ける掘削撹拌装置のフレームの下部の左右両側に、横軸回転する撹拌翼を有する掘削撹拌体を夫々設け、掘削撹拌体は、油圧モータにより回転する出力軸と平行な横取付部材に撹拌翼を、横取付部材の長さ方向に複数並設し、複数並設した撹拌翼のうち、最内側の撹拌翼は、前記フレームの左右側縁を基準に側縁の内側と外側の間を、掘削撹拌体の軸心方向に移動するようにした構成は、公知である（特許文献１）。
また、従来、掘削撹拌装置のフレームの下部の左右両側の掘削撹拌体の間に中央掘削撹拌体を有する掘削撹拌用トラックリンクチェーンを設けた構成は、公知である（特許文献２）。 Conventionally, excavation agitators having agitation blades that rotate on a horizontal axis are provided on both left and right sides of the lower part of the frame of an excavation agitator that is attached to the arm of a freely movable base machine.The excavation agitator has an output shaft rotated by a hydraulic motor. A plurality of stirring blades are arranged side by side in the length direction of the horizontal mounting member parallel to the horizontal mounting member, and among the plurality of stirring blades arranged in parallel, the innermost stirring blade is placed on the side with respect to the left and right side edges of the frame. A configuration in which the excavation stirring body is moved in the axial direction between the inside and outside of the edge is known (Patent Document 1).
Furthermore, a configuration in which an excavation agitation track link chain having a central excavation agitator is provided between the left and right excavation agitators at the lower part of the frame of an excavation agitator is conventionally known (Patent Document 2).

特開２０１３ー５７２０８号公報JP2013-57208A 特開２０１６ー１４２０３８号公報Unexamined Japanese Patent Publication No. 2016-142038

前記公知例のうち前者のものでは、土壌改良する地盤の着底断面が円弧状になって支持荷重が低いという課題がある。
前記公知例のうち後者のものでは、掘削撹拌装置による前後方向の撹拌領域が狭く、撹拌効率が低いという課題がある。
本願は、掘削撹拌部の構成を工夫し、撹拌効率および作業効率の良い地盤改良装置を提供するものである。 The former of the above-mentioned known examples has a problem in that the bottom contact section of the ground to be improved is arcuate and the supporting load is low.
The latter of the known examples has a problem in that the agitation area in the front and back direction by the excavation agitation device is narrow and the agitation efficiency is low.
The present application provides a ground improvement device with improved agitation efficiency and work efficiency by devising the configuration of the excavation agitation section.

請求項１は、走行自在なベースマシン１のアーム２に取付ける掘削撹拌装置４の吊下げフレーム５の下部にケース１７を設け、ケース１７には左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を前後一対設け、前後の側部掘削撹拌部１０は２機の油圧モーター２１と油圧モーター２２によりそれぞれ互いに正逆回転して地盤を相対撹拌する構成とした地盤改良装置としたものである。
請求項２は、左右の側部掘削撹拌部１０の間には、左右の側部掘削撹拌部１０の間の地盤を掘削撹拌する中央掘削撹拌部１２を設け、中央掘削撹拌部１２は、ケース１７に設けた左右一対の掘削撹拌用トラックリンクチェーン１１と左右の掘削撹拌用トラックリンクチェーン１１に掛け渡した中央掘削撹拌体３５とにより構成し、各掘削撹拌用トラックリンクチェーン１１には所定間隔をおいて掘削ビット３３を複数並設し、中央掘削撹拌体３５は掘削撹拌用トラックリンクチェーン１１の回転方向に複数所定間隔おいて並設して構成した地盤改良装置としたものである。
請求項３は、中央掘削撹拌部１２の掘削撹拌用トラックリンクチェーン１１は、前後の側部掘削撹拌部１０をそれぞれ駆動する前後一対の油圧モーターの何れか一方の駆動力により回転する構成とし、前後一対の油圧モーターのうちの何れか他方の油圧モーターの駆動力は中央掘削撹拌部１２に伝達させない構成とした地盤改良装置としたものである。
請求項４は、前記側部掘削撹拌部１０は、前後一対の油圧モーター２１、２２の左右のモーター出力軸２５と平行な左右方向の横取付部材２８に放射方向に突出する撹拌翼３０を複数並設し、この横取付部材２８と撹拌翼３０をモーター出力軸２５の回転方向に複数並設して構成した地盤改良装置としたものである。
請求項５は、前記前後一対の側部掘削撹拌部１０をそれぞれ駆動する油圧モーター２１、２２はそれぞれ独立して駆動する構成とし、かつ、油圧モーター２１と油圧モーター２２の油圧回路中にフローデバイダー４５を設けた地盤改良装置としたものである。
請求項６は、前記側部掘削撹拌部１０は、油圧モーター２１と油圧モーター２２のモーター出力軸２５を中心に回転する撹拌翼３０を設けて構成し、中央掘削撹拌部１２の中央掘削撹拌体３５は、少なくとも、撹拌翼３０の下側の回転軌跡と同じ高さ位置から、撹拌翼３０の上側の回転軌跡より所定間隔おいた上方位置を回転する構成とした地盤改良装置としたものである。
請求項７は、前記側部掘削撹拌部１０は、撹拌翼３０が複数並設された左右方向の横取付部材２８を、前記モーター出力軸２５に固定状態に設けたボス部２６に放射方向に突出するアーム部２７を介して取付けて側部掘削撹拌体２０を構成し、この側部掘削撹拌体２０を、前後一対の前記油圧モーター２１、２２の前記ケース１７の左右両側に突出するモーター出力軸２５のそれぞれに設け、油圧モーター２１、２２は前記側部掘削撹拌体２０の横取付部材２８の回転軌跡内に設けた地盤改良装置としたものである。 According to a first aspect of the present invention, a case 17 is provided at the lower part of a hanging frame 5 of an excavation agitation device 4 attached to an arm 2 of a base machine 1 that can freely travel, and the case 17 has a side portion having a pair of left and right side excavation agitation bodies 20. A ground improvement device in which a pair of front and rear excavation agitation units 10 are provided, and the front and rear side excavation agitation units 10 are configured to mutually rotate in forward and reverse directions using two hydraulic motors 21 and 22 to relatively agitate the ground. It is.
According to a second aspect of the present invention, a central excavation and agitation section 12 is provided between the left and right side excavation and agitation sections 10 for excavating and agitating the ground between the left and right side excavation and agitation sections 10, and the central excavation and agitation section 12 is arranged between the left and right side excavation and agitation sections 10. It consists of a pair of left and right excavation agitation track link chains 11 provided at the left and right excavation agitation track link chains 17 and a central excavation agitation body 35 that spans the left and right excavation agitation track link chains 11. A plurality of excavation bits 33 are arranged in parallel, and a plurality of central excavation agitators 35 are arranged in parallel at predetermined intervals in the rotational direction of the excavation agitation track link chain 11.
According to a third aspect of the present invention, the excavation agitation track link chain 11 of the central excavation agitation section 12 is configured to be rotated by the driving force of one of a pair of front and rear hydraulic motors that respectively drive the front and rear side excavation agitation sections 10, The ground improvement device is configured such that the driving force of the other hydraulic motor out of the pair of front and rear hydraulic motors is not transmitted to the central excavation stirring section 12.
According to a fourth aspect of the present invention, the side excavation stirring section 10 includes a plurality of stirring blades 30 projecting in the radial direction on the horizontal mounting member 28 in the left and right direction parallel to the left and right motor output shafts 25 of the pair of front and rear hydraulic motors 21 and 22. A plurality of horizontal mounting members 28 and stirring blades 30 are arranged in parallel in the rotational direction of the motor output shaft 25 to form a ground improvement device.
According to a fifth aspect of the present invention, the hydraulic motors 21 and 22 that respectively drive the pair of front and rear side excavation stirring parts 10 are configured to be driven independently, and a flow divider is provided in the hydraulic circuit of the hydraulic motor 21 and the hydraulic motor 22. 45 is installed as a ground improvement device.
According to a sixth aspect of the present invention, the side excavation stirring section 10 is configured by providing a hydraulic motor 21 and a stirring blade 30 that rotates around the motor output shaft 25 of the hydraulic motor 22, and the central excavation stirring section 12 has a central excavation stirring body. 35 is a ground improvement device configured to rotate from at least a position at the same height as the lower rotation trajectory of the stirring blade 30 to a position above the rotation trajectory above the stirring blade 30 at a predetermined interval. .
According to a seventh aspect of the present invention, the side excavation and agitation unit 10 includes a horizontal mounting member 28 in the left and right direction in which a plurality of agitation blades 30 are arranged side by side, in a radial direction on a boss part 26 fixedly provided on the motor output shaft 25. The side excavation agitator 20 is configured by being attached via the protruding arm portion 27, and the side excavator agitator 20 is connected to the front and rear hydraulic motors 21 and 22 by motor outputs that protrude to both left and right sides of the case 17. Hydraulic motors 21 and 22 are provided on each of the shafts 25, and serve as a ground improvement device provided within the rotation locus of the horizontal mounting member 28 of the side excavation agitator 20.

請求項１の発明では、掘削撹拌装置４の下部のケース１７には左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を前後一対設け、前後の側部掘削撹拌部１０は２機の油圧モーター２１と油圧モーター２２によりそれぞれ正逆回転して相対撹拌する構成としているので、２機の油圧モーター２１と油圧モーター２２とが互いに正逆回転し、撹拌翼３０にて相対撹拌でき、撹拌効率を向上させることができる。
請求項２の発明では、左右の側部掘削撹拌部１０の間に設けた中央掘削撹拌部１２は、左右一対の掘削撹拌用トラックリンクチェーン１１とこの掘削撹拌用トラックリンクチェーン１１に取付けた中央掘削撹拌体３５とにより構成し、各掘削撹拌用トラックリンクチェーン１１には所定間隔をおいて掘削ビット３３を複数並設しているので、掘削撹拌用トラックリンクチェーン１１と中央掘削撹拌体３５はケース１７の下方を横断するように掘削撹拌移動して、地盤の平面の着底断面が増加させることができ、良質な改良柱状にすることができる。
請求項３の発明では、中央掘削撹拌部１２の掘削撹拌用トラックリンクチェーン１１は、側部掘削撹拌部１０を駆動する前後一対の油圧モーターの何れか一方の駆動力により回転させ、何れか他方の油圧モーターの駆動力は中央掘削撹拌部１２に伝達させない構成としたので、ケース１７の前後の互いに逆転する駆動歯車３７と下側受動ローラー４０とに、掘削撹拌用トラックリンクチェーン１１を掛け回す構成にしても、掘削撹拌用トラックリンクチェーン１１には一対の油圧モーターのうちの何れか一方の駆動回転のみが伝達されて駆動され、円滑に作動させることができ、そのため、中央掘削撹拌部１２の駆動機構を簡素に構成でき、合理的な構成とすることができる。
請求項４の発明では、側部掘削撹拌部１０は、油圧モーター２１、２２により回転するモーター出力軸２５と平行な横取付部材２８の長さ方向に複数並設して回転する撹拌翼３０を有する側部掘削撹拌体２０を夫々設けているので、前後の側部掘削撹拌部１０により広範囲の地盤改良が可能になって、作業効率を向上させらることができる。
請求項５の発明では、前後一対の側部掘削撹拌部１０をそれぞれ駆動する油圧モーター２１、２２はそれぞれ独立して駆動する構成とし、かつ、油圧モーター２１と油圧モーター２２の油圧回路中にフローデバイダー４５を設けているので、油圧モーター２１、２２への送油流量を均等にし、撹拌効率を向上させることができる。
請求項６の発明では、側部掘削撹拌部１０は、油圧モーター２１と油圧モーター２２のモーター出力軸２５を中心に回転する撹拌翼３０を設けて構成し、中央掘削撹拌部１２の中央掘削撹拌体３５は、少なくとも、撹拌翼３０の下側の回転軌跡と同じ高さ位置から、撹拌翼３０の上側の回転軌跡より所定間隔おいた上方位置を回転する構成としたので、掘削通過断面を全断面撹拌することで、土砂が常にほぐされ、貫入力低減が可能となる。
請求項７の発明では、前記側部掘削撹拌部１０は、撹拌翼３０が複数並設された左右方向の横取付部材２８を、前記モーター出力軸２５に固定状態に設けたボス部２６に放射方向に突出するアーム部２７を介して取付けて側部掘削撹拌体２０を構成し、この側部掘削撹拌体２０を、前後一対の前記油圧モーター２１、２２の前記ケース１７の左右両側に突出するモーター出力軸２５のそれぞれに設け、油圧モーター２１、２２は前記側部掘削撹拌体２０の横取付部材２８の回転軌跡内に設けているので、前後の側部掘削撹拌部１０を小型に構成することができる。 In the invention of claim 1, the lower case 17 of the excavation agitation device 4 is provided with a pair of front and rear side excavation agitators 10 having a pair of left and right side excavation agitators 20, and the front and rear side excavation agitators 10 have two Since the hydraulic motor 21 and the hydraulic motor 22 of the machine are configured to rotate forward and backward, respectively, for relative stirring, the two hydraulic motors 21 and 22 rotate forward and backward, and the stirring blades 30 can perform relative stirring. , stirring efficiency can be improved.
In the invention of claim 2, the central excavation agitation unit 12 provided between the left and right side excavation agitation units 10 includes a pair of left and right excavation agitation track link chains 11 and a central excavation agitation track link chain 11 attached to the left and right excavation agitation track link chains 11. Each excavation agitation track link chain 11 has a plurality of excavation bits 33 arranged in parallel at predetermined intervals, so that the excavation agitation track link chain 11 and the central excavation agitation body 35 are By excavating and agitating the ground so as to traverse the lower part of the case 17, the bottoming section of the ground plane can be increased, and a high-quality improved columnar shape can be obtained.
In the invention of claim 3, the excavation agitation track link chain 11 of the central excavation agitation section 12 is rotated by the driving force of one of the pair of front and rear hydraulic motors that drive the side excavation agitation section 10; Since the driving force of the hydraulic motor is not transmitted to the central excavation agitation unit 12, the excavation agitation track link chain 11 is wound around the driving gears 37 and the lower passive rollers 40, which rotate in opposite directions at the front and rear of the case 17. Even in this configuration, the driving rotation of only one of the pair of hydraulic motors is transmitted to the excavation stirring track link chain 11 to drive it, and it can operate smoothly. Therefore, the central excavation stirring part 12 The drive mechanism can be configured simply and rationally.
In the invention of claim 4, the side excavation agitation section 10 includes a plurality of agitation blades 30 arranged in parallel and rotated in the length direction of the horizontal mounting member 28 parallel to the motor output shaft 25 rotated by the hydraulic motors 21 and 22. Since the side excavation and agitation bodies 20 are provided respectively, the front and rear side excavation and agitation units 10 enable a wide range of ground improvement, thereby improving work efficiency.
In the invention of claim 5, the hydraulic motors 21 and 22 that respectively drive the pair of front and rear side excavation and agitation parts 10 are configured to be driven independently, and the hydraulic motors 21 and 22 have a configuration in which there is no flow in the hydraulic circuits of the hydraulic motors 21 and 22. Since the divider 45 is provided, the oil flow rate to the hydraulic motors 21 and 22 can be equalized, and stirring efficiency can be improved.
In the invention of claim 6, the side excavation stirring section 10 is configured by providing a hydraulic motor 21 and a stirring blade 30 that rotates around the motor output shaft 25 of the hydraulic motor 22, Since the body 35 is configured to rotate at least from a position at the same height as the lower rotation locus of the stirring blade 30 to an upper position at a predetermined interval from the upper rotation locus of the stirring blade 30, the entire excavation passage cross section is rotated. By cross-sectionally stirring, the soil is constantly loosened, making it possible to reduce the penetration force.
In the invention according to claim 7, the side excavation stirring section 10 has a horizontal mounting member 28 in the left and right direction in which a plurality of stirring blades 30 are arranged side by side, and a boss section 26 fixedly provided on the motor output shaft 25. The side excavation agitator 20 is configured by being attached via an arm portion 27 protruding in the direction, and this side excavation agitator 20 protrudes from both left and right sides of the case 17 of the pair of front and rear hydraulic motors 21 and 22. Since the hydraulic motors 21 and 22 are provided on each of the motor output shafts 25 and are provided within the rotation locus of the horizontal mounting member 28 of the side excavation agitator 20, the front and rear side excavation agitators 10 are configured to be compact. be able to.

ベースマシンに取付けた状態の地盤改良装置の側面図。A side view of the ground improvement device attached to the base machine. 掘削撹拌用トラックリンクチェーンを省略した掘削撹拌装置の概略側面図。FIG. 2 is a schematic side view of an excavation agitation device in which an excavation agitation track link chain is omitted. 掘削撹拌装置の側面図。A side view of the excavation stirring device. 同一部縦断正面図。A vertical sectional front view of the same part. 同縦断正面図。The longitudinal front view of the same. 同概略横断平面図。The same schematic cross-sectional plan view. 油圧回路図。Hydraulic circuit diagram. 地盤改良装置の作業状態側面図。A side view of the soil improvement device in working condition.

本発明の一実施形態図により説明する。図１に示したように、１は所謂バックホー（油圧ショベル）型のベースマシンであり、ベースマシン１のアーム２にブラケット３を介して掘削撹拌装置４の上部を着脱自在に取付ける。
なお、本発明を説明するにあたり、理解を容易にするため、ベースマシン１を前進走行させる走行方向を基準に、前後・左右・上下等の方向を示して説明するが、これにより、本発明の構成が限定されることはない。
また、本願の要件ではないので、詳細は省略するが、アーム２はリンクにより構成して掘削撹拌装置４を地盤Ｇに垂直状態で挿入可能に構成すると共に（図１）、掘削撹拌装置４の垂直状態を保持したまま、アーム２の伸縮や旋回により前後左右に移動させて掘削撹拌作業可能に構成している（図８参照）。 An embodiment of the present invention will be explained using diagrams. As shown in FIG. 1, 1 is a so-called backhoe (hydraulic excavator) type base machine, and the upper part of an excavation stirring device 4 is detachably attached to an arm 2 of the base machine 1 via a bracket 3.
In order to make the present invention easier to understand, directions such as front and back, left and right, and up and down will be shown based on the direction in which the base machine 1 moves forward. The configuration is not limited.
Furthermore, although the details are omitted as this is not a requirement of the present application, the arm 2 is configured by a link so that the excavation agitation device 4 can be inserted vertically into the ground G (Fig. 1), and the While maintaining the vertical position, the arm 2 can be moved forward, backward, left and right by extending and contracting or turning to perform excavation and agitation work (see Fig. 8).

掘削撹拌装置４は、掘削撹拌して地盤改良する予定改良地盤に掘削撹拌装置４の下端が到達する所定長さを有する吊下げフレーム５を有する。
吊下げフレーム５は、例えば、中空の管状部材で形成し、吊下げフレーム５内には土壌改良剤（固化材スラリー）を供給するための土壌改良剤ホース６と空気を送るエアホ－ス７と油圧ホース８等を設ける。
なお、吊下げフレーム５の長さは、地盤改良工事で予定している掘削の長さに応じて、適宜、変更可能に構成すると、好適である。
すなわち、本発明は、ベースマシン１のアーム２の先端に取り付けた掘削撹拌装置４の４つの側部掘削撹拌部１０を正逆、相対撹拌を行いつつ、中央に設置した掘削撹拌用トラックリンクチェーン１１からなる中央掘削撹拌部１２とによりスラリー状の改良材を注入しながら、改良材と原位置土とを強制撹拌するものである。 The excavation agitation device 4 has a hanging frame 5 having a predetermined length such that the lower end of the excavation agitation device 4 reaches the planned improved ground to be improved by excavation and agitation.
The hanging frame 5 is formed of a hollow tubular member, for example, and includes a soil conditioner hose 6 for supplying a soil conditioner (solidification agent slurry) and an air hose 7 for sending air. Hydraulic hose 8 etc. are provided.
Note that it is preferable that the length of the hanging frame 5 is configured to be changeable as appropriate depending on the length of excavation planned for soil improvement work.
That is, the present invention provides a truck link chain for excavation agitation installed in the center while performing forward/reverse and relative agitation of the four side excavation agitation parts 10 of the excavation agitation device 4 attached to the tip of the arm 2 of the base machine 1. The improvement material and the in-situ soil are forcibly stirred while the improvement material in the form of slurry is injected by the central excavation stirring section 12 consisting of 11.

具体的には、前記吊下げフレーム５の下部には、取付フレーム１５の横筒部１４の中央部分を固定状態に取付け、横筒部１４の左右両側には下方に伸びる左右一対の縦筒部１６の上部を接続する。
取付フレーム１５の構成は任意であり、左右の縦筒部１６を左右方向に所定間隔をおいて設ければよい。
左右の縦筒部１６間には、ケース１７を設ける。
ケース１７は、正面視において縦長の四角形状であり、側面視においては略三角形状に形成しており、ケース１７の左右側面所定位置に左右の縦筒部１６の下部をボルト等により着脱自在であって固定状態に取付ける。 Specifically, the center portion of the horizontal tube portion 14 of the mounting frame 15 is fixedly attached to the lower part of the hanging frame 5, and a pair of left and right vertical tube portions extending downward is provided on both left and right sides of the horizontal tube portion 14. Connect the top of 16.
The configuration of the mounting frame 15 is arbitrary, and the left and right vertical tube portions 16 may be provided at a predetermined interval in the left-right direction.
A case 17 is provided between the left and right vertical cylinder parts 16.
The case 17 has a vertically elongated rectangular shape when viewed from the front, and a substantially triangular shape when viewed from the side, and the lower portions of the left and right vertical cylinder portions 16 can be attached and detached to predetermined positions on the left and right sides of the case 17 by bolts or the like. Install it in a fixed position.

縦筒部１６との取付け部分より下側のケース１７の左右両側には左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を設け、側部掘削撹拌体２０に対応する部分のケース１７には側部掘削撹拌部１０の駆動源となる前後一対の油圧モーター２１、２２を夫々設ける。
すなわち、掘削撹拌装置４は、ケース１７の下部に、前後一対の油圧モーター２１、２２により駆動される、左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を前後一対設け、４つの側部掘削撹拌体２０により地盤を掘削撹拌する構成としている。
そのため、前後の側部掘削撹拌部１０を２機の油圧モーター２１、２２が互いに正逆回転して撹拌する相対撹拌が可能となり、撹拌効率を向上させられる。 A side excavation agitator 10 having a pair of left and right side excavation agitators 20 is provided on both left and right sides of the case 17 below the attachment part with the vertical cylinder part 16. The case 17 is provided with a pair of front and rear hydraulic motors 21 and 22, which serve as a driving source for the side excavation and agitation section 10, respectively.
That is, the excavation agitation device 4 includes a pair of front and rear side excavation agitation units 10 having a pair of left and right side excavation agitation bodies 20, which are driven by a pair of front and rear hydraulic motors 21 and 22, in the lower part of the case 17. The structure is such that the ground is excavated and agitated by two side excavation agitators 20.
Therefore, relative stirring in which the two hydraulic motors 21 and 22 mutually rotate forward and backward to stir the front and rear side excavation stirring parts 10 is possible, and stirring efficiency can be improved.

油圧モーター２１、２２は中空式構成とし、油圧モーター２１、２２のそれぞれの中心（軸心）にモーター出力軸２５をそれぞれ貫通させる。
油圧モーター２１、２２の左右の各モーター出力軸２５には側部掘削撹拌体２０をそれぞれ設ける。
側部掘削撹拌体２０の構成は任意であり、一例を示すと、モーター出力軸２５にボス部２６を固定状態に着脱可能に取付け、ボス部２６にはモーター出力軸２５に対して放射方向に突出するアーム部２７の基部を固定する。アーム部２７の先端側にはモーター出力軸２５と平行の横取付部材２８の内端側を取付ける。横取付部材２８にはモーター出力軸２５に対して放射方向に突出する撹拌翼３０を横取付部材２８の長さ方向に所定間隔をおいて複数並設する（図５）。 The hydraulic motors 21 and 22 have a hollow configuration, and a motor output shaft 25 is passed through the center (axis center) of each of the hydraulic motors 21 and 22.
A side excavation agitator 20 is provided on each of the left and right motor output shafts 25 of the hydraulic motors 21 and 22, respectively.
The configuration of the side excavation agitator 20 is arbitrary; for example, a boss part 26 is fixedly and removably attached to the motor output shaft 25, and a boss part 26 is provided with a boss part 26 in a radial direction with respect to the motor output shaft 25. The base of the protruding arm portion 27 is fixed. The inner end side of a horizontal mounting member 28 parallel to the motor output shaft 25 is attached to the tip side of the arm portion 27. A plurality of stirring blades 30 that protrude in the radial direction with respect to the motor output shaft 25 are arranged on the horizontal mounting member 28 at predetermined intervals in the longitudinal direction of the horizontal mounting member 28 (FIG. 5).

前側側部掘削撹拌部１０Ａの撹拌翼３０と後側側部掘削撹拌部１０Ｂの撹拌翼３０とは、互いに反対に回転し、図３において、前側側部掘削撹拌部１０Ａの撹拌翼３０は反時計回転し、後側側部掘削撹拌部１０Ｂの撹拌翼３０は時計回転させる。
これにより、掘削撹拌装置４の撹拌効果を向上させられる。
また、油圧モーター２１と油圧モーター２２とを互いに逆回転させ、前側側部掘削撹拌部１０Ａの撹拌翼３０を時計回転させ、後側側部掘削撹拌部１０Ｂの撹拌翼３０を反時計回転させてもよい。
しかして、取付フレーム１５の下方の左右の側部掘削撹拌部１０の間には、左右の側部掘削撹拌部１０の間の予定改良地盤を撹拌する中央掘削撹拌部１２を設ける。中央掘削撹拌部１２は、ケース１７に設けた左右一対の掘削撹拌用トラックリンクチェーン１１を有して構成する。掘削撹拌用トラックリンクチェーン１１は無端チェーンにより構成し、各掘削撹拌用トラックリンクチェーン１１には所定間隔をおいて掘削ビット３３をそれぞれ取付ける。 The stirring blades 30 of the front side excavation stirring part 10A and the stirring blades 30 of the rear side excavation stirring part 10B rotate in opposite directions, and in FIG. The stirring blade 30 of the rear side excavation stirring section 10B is rotated clockwise.
Thereby, the stirring effect of the excavation stirring device 4 can be improved.
Further, the hydraulic motor 21 and the hydraulic motor 22 are rotated in opposite directions, the stirring blades 30 of the front side excavation and stirring section 10A are rotated clockwise, and the stirring blades 30 of the rear side excavation and stirring section 10B are rotated counterclockwise. Good too.
Therefore, between the left and right side excavation and agitation units 10 below the mounting frame 15, a central excavation and agitation unit 12 is provided to agitate the planned improved ground between the left and right side excavation and agitation units 10. The central excavation and agitation section 12 includes a pair of left and right excavation and agitation track link chains 11 provided in a case 17 . The excavation agitation track link chain 11 is constituted by an endless chain, and excavation bits 33 are attached to each excavation agitation track link chain 11 at predetermined intervals.

また、中央掘削撹拌部１２は、ケース１７に設けた左右一対の掘削撹拌用トラックリンクチェーン１１と左右の掘削撹拌用トラックリンクチェーン１１に掛け渡した中央掘削撹拌体３５とにより構成し、各掘削撹拌用トラックリンクチェーン１１には所定間隔をおいて掘削ビット３３を複数並設し、中央掘削撹拌体３５は掘削撹拌用トラックリンクチェーン１１の回転方向に複数所定間隔おいて並設して構成する。
したがって、中央掘削撹拌部１２は掘削撹拌用トラックリンクチェーン１１の掘削ビット３３と中央掘削撹拌体３５によりケース１７の下方の地盤を掘削撹拌する。 The central excavation agitation unit 12 is composed of a pair of left and right excavation agitation track link chains 11 provided in the case 17 and a central excavation agitation body 35 that is stretched over the left and right excavation agitation track link chains 11. A plurality of excavation bits 33 are arranged in parallel at predetermined intervals on the agitation track link chain 11, and a plurality of central excavation agitators 35 are arranged in parallel at predetermined intervals in the rotational direction of the excavation agitation track link chain 11. .
Therefore, the central excavation and agitation section 12 excavates and agitates the ground below the case 17 using the excavation bit 33 of the excavation and agitation track link chain 11 and the central excavation and agitation body 35 .

上側部分のケース１７には受動歯車（ローラー）３６を左右一対設け、この受動歯車３６に対峙するように左右のモーター出力軸２５のボス部２６に駆動歯車３７をそれぞれ設け、受動歯車３６と駆動歯車３７の間に掘削撹拌用トラックリンクチェーン１１を掛け回す。
この場合、側部掘削撹拌部１０Ａまたは側部掘削撹拌部１０Ｂの何れか一方のボス部２６に駆動歯車３７を設け、何れか他方のボス部２６にはボス部２６の駆動回転を伝達させない滑り軸受（アイドラ）３９を介して設けた下側受動ローラー４０を設ける。
そのため、掘削撹拌用トラックリンクチェーン１１は油圧モーター２１または油圧モーター２２の何れか一方の駆動回転のみが伝達されて駆動されるので、中央掘削撹拌部１２の駆動機構を簡素に構成でき、合理的な構成とすることができる。 A pair of left and right passive gears (rollers) 36 are provided on the case 17 in the upper part, and drive gears 37 are provided on the boss portions 26 of the left and right motor output shafts 25 so as to face the passive gears 36. A track link chain 11 for excavation and agitation is passed between the gears 37.
In this case, a driving gear 37 is provided on the boss portion 26 of either the side excavation agitation portion 10A or the side excavation agitation portion 10B, and the drive gear 37 is provided on the boss portion 26 of either the side excavation agitation portion 10A or the side excavation agitation portion 10B. A lower passive roller 40 is provided via a bearing (idler) 39.
Therefore, the excavation agitation track link chain 11 is driven by transmitting only the driving rotation of either the hydraulic motor 21 or the hydraulic motor 22, so the drive mechanism of the central excavation agitation section 12 can be configured simply and rationally. It can be configured as follows.

油圧モーター２１、２２はそれぞれ独立して駆動するが、負荷の変動で左右の油圧モーター２１、２２間に大きな回転差異が発生するのを防ぐため、油圧回路上にフローデバイダー４５を設置する（図５、７）。
そのため、油圧モーター２１、２２への送油流量を均等にし、撹拌効率を向上させられる。
この場合、前側側部掘削撹拌部１０Ａの撹拌翼３０と後側側部掘削撹拌部１０Ｂの撹拌翼３０とは、平面視において、互いに回転軌跡を重ねないように配置する（図６）。
そのため、厳密に、前側側部掘削撹拌部１０Ａの撹拌翼３０と後側側部掘削撹拌部１０Ｂの撹拌翼３０との回転が互いに干渉するのを防止でき、掘削撹拌装置４の撹拌効果を低下させることなく、構成あるいは回転制御を簡素にできる。 Although the hydraulic motors 21 and 22 are driven independently, a flow divider 45 is installed on the hydraulic circuit to prevent large rotational differences between the left and right hydraulic motors 21 and 22 due to load fluctuations (Fig. 5, 7).
Therefore, the oil flow rate to the hydraulic motors 21 and 22 can be made equal, and the stirring efficiency can be improved.
In this case, the stirring blades 30 of the front side excavation and stirring section 10A and the stirring blades 30 of the rear side excavation and stirring section 10B are arranged so that their rotation trajectories do not overlap with each other in plan view (FIG. 6).
Therefore, it is possible to strictly prevent the rotations of the stirring blades 30 of the front side excavation stirring section 10A and the stirring blades 30 of the rear side excavation stirring section 10B from interfering with each other, and the stirring effect of the excavation stirring device 4 is reduced. The configuration or rotation control can be simplified without having to do so.

図７は、本発明の油圧回路の一例をし、４６は油タンク、４７は油圧ポンプ、４８は切替バルブである。
ケース１７の所定位置には土壌改良剤およびエアーを吐出させる吐出口４９を設ける。本実施形態では、ケース１７の下面側に開口させている（図６）。
掘削撹拌用トラックリンクチェーン１１の所定位置にはテンションローラー５０を当接させる。テンションローラー５０を設ける位置は任意であるが、本実施形態では、駆動歯車３７と受動歯車３６の間の掘削撹拌用トラックリンクチェーン１１と、受動歯車３６と下側受動ローラー４０の間の掘削撹拌用トラックリンクチェーン１１にはテンションローラー５０を当接させて、テンションを付与する構成としている。 FIG. 7 shows an example of the hydraulic circuit of the present invention, where 46 is an oil tank, 47 is a hydraulic pump, and 48 is a switching valve.
A discharge port 49 for discharging the soil conditioner and air is provided at a predetermined position of the case 17. In this embodiment, the opening is provided on the lower surface side of the case 17 (FIG. 6).
A tension roller 50 is brought into contact with a predetermined position of the excavation stirring track link chain 11. Although the tension roller 50 can be provided at any position, in this embodiment, the track link chain 11 for excavation and agitation between the drive gear 37 and the passive gear 36 and the position for excavation and agitation between the passive gear 36 and the lower passive roller 40 are used. A tension roller 50 is brought into contact with the track link chain 11 to apply tension.

テンションローラー５０はテンションアーム５１の先端に回転自在に取付け、テンションアーム５１の基部をケース１７側に設けた回動支点軸５２に回動自在に取付け、テンションアーム５１とケース１７側との間にテンションアーム５１を回動させる伸縮部材５３を設ける。
そのため、受動歯車３６と駆動歯車３７と下側受動ローラー４０の間に掘削撹拌用トラックリンクチェーン１１を掛け回し、駆動歯車３７と受動歯車３６との間の掘削撹拌用トラックリンクチェーン１１および受動歯車３６と下側受動ローラー４０の間の掘削撹拌用トラックリンクチェーン１１のそれぞれ内側にテンションローラー５０を当接させ、伸縮部材５３を伸張させてテンションを付与する。 The tension roller 50 is rotatably attached to the tip of the tension arm 51, and the base of the tension arm 51 is rotatably attached to a rotation fulcrum shaft 52 provided on the case 17 side. A telescopic member 53 for rotating the tension arm 51 is provided.
Therefore, the track link chain 11 for excavation stirring is routed between the driven gear 36, the driving gear 37, and the lower passive roller 40, and the track link chain 11 for excavating stirring and the passive gear are connected between the driving gear 37 and the passive gear 36. A tension roller 50 is brought into contact with each inner side of the track link chain 11 for excavation stirring between the lower passive roller 36 and the lower passive roller 40, and the elastic member 53 is expanded to apply tension.

本発明は、上記構成であり、走行自在なベースマシン１のアーム２に取付ける掘削撹拌装置４の吊下げフレーム５の下部にケース１７を設け、ケース１７には左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を前後一対設け、前後の側部掘削撹拌部１０は２機の油圧モーター２１と油圧モーター２２によりそれぞれ互いに正逆回転して地盤を相対撹拌する構成とする。
また、左右の側部掘削撹拌部１０の間には、左右の側部掘削撹拌部１０の間の地盤を掘削撹拌する中央掘削撹拌部１２を設け、中央掘削撹拌部１２は、ケース１７に設けた左右一対の掘削撹拌用トラックリンクチェーン１１と左右の掘削撹拌用トラックリンクチェーン１１に掛け渡した中央掘削撹拌体３５とにより構成し、各掘削撹拌用トラックリンクチェーン１１には所定間隔をおいて掘削ビット３３を複数並設し、中央掘削撹拌体３５は掘削撹拌用トラックリンクチェーン１１の回転方向に複数所定間隔おいて並設して構成している。 The present invention has the above-mentioned configuration, and a case 17 is provided at the lower part of the hanging frame 5 of the excavation stirring device 4 attached to the arm 2 of the base machine 1 that can freely travel. A pair of front and rear side excavation agitation units 10 are provided, and the front and rear side excavation agitation units 10 are configured to mutually rotate in forward and reverse directions by two hydraulic motors 21 and 22 to relatively agitate the ground.
Further, between the left and right side excavation and agitation units 10, there is provided a central excavation and agitation unit 12 that excavates and agitates the ground between the left and right side excavation and agitation units 10, and the central excavation and agitation unit 12 is provided in the case 17. It consists of a pair of left and right excavation agitation track link chains 11 and a central excavation agitation body 35 that extends over the left and right excavation agitation track link chains 11. A plurality of excavation bits 33 are arranged in parallel, and a plurality of central excavation agitators 35 are arranged in parallel at predetermined intervals in the rotational direction of the excavation agitation track link chain 11.

また、中央掘削撹拌部１２の掘削撹拌用トラックリンクチェーン１１は、前後の側部掘削撹拌部１０をそれぞれ駆動する前後一対の油圧モーターの何れか一方の駆動力により回転する構成とし、前後一対の油圧モーターのうちの何れか他方の油圧モーターの駆動力は中央掘削撹拌部１２に伝達させない構成とする。
また、前記側部掘削撹拌部１０は、前後一対の油圧モーター２１、２２の左右のモーター出力軸２５と平行な左右方向の横取付部材２８に放射方向に突出する撹拌翼３０を複数並設し、この横取付部材２８と撹拌翼３０をモーター出力軸２５の回転方向に複数並設して構成している。
また、前記前後一対の側部掘削撹拌部１０をそれぞれ駆動する油圧モーター２１、２２はそれぞれ独立して駆動する構成とし、かつ、油圧モーター２１と油圧モーター２２の油圧回路中にフローデバイダー４５を設けている。 The excavation agitation track link chain 11 of the central excavation agitation unit 12 is configured to be rotated by the driving force of one of the front and rear hydraulic motors that drive the front and rear side excavation agitation units 10, respectively. The driving force of the other hydraulic motor is not transmitted to the central excavation stirring section 12.
Further, the side excavation stirring section 10 includes a plurality of stirring blades 30 that protrude in the radial direction and are arranged in parallel on the horizontal mounting member 28 in the left and right direction parallel to the left and right motor output shafts 25 of the front and rear pair of hydraulic motors 21 and 22. A plurality of horizontal mounting members 28 and stirring blades 30 are arranged in parallel in the rotational direction of the motor output shaft 25.
Further, the hydraulic motors 21 and 22 that respectively drive the pair of front and rear side excavation and stirring parts 10 are configured to be driven independently, and a flow divider 45 is provided in the hydraulic circuit of the hydraulic motor 21 and the hydraulic motor 22. ing.

また、前記側部掘削撹拌部１０は、油圧モーター２１と油圧モーター２２のモーター出力軸２５を中心に回転する撹拌翼３０を設けて構成し、中央掘削撹拌部１２の中央掘削撹拌体３５は、少なくとも、撹拌翼３０の下側の回転軌跡と同じ高さ位置から、撹拌翼３０の上側の回転軌跡より所定間隔おいた上方位置を回転する構成としている。
また、前記側部掘削撹拌部１０は、撹拌翼３０が複数並設された左右方向の横取付部材２８を、前記モーター出力軸２５に固定状態に設けたボス部２６に放射方向に突出するアーム部２７を介して取付けて側部掘削撹拌体２０を構成し、この側部掘削撹拌体２０を、前後一対の前記油圧モーター２１、２２の前記ケース１７の左右両側に突出するモーター出力軸２５のそれぞれに設け、油圧モーター２１、２２は前記側部掘削撹拌体２０の横取付部材２８の回転軌跡内に設けている。 Further, the side excavation agitation section 10 includes a hydraulic motor 21 and an agitation blade 30 that rotates around the motor output shaft 25 of the hydraulic motor 22, and the central excavation agitation body 35 of the central excavation agitation section 12 includes: The stirring blade 30 is configured to rotate at least from a position at the same height as the lower rotational trajectory of the stirring blade 30 to a position above the rotational trajectory above the stirring blade 30 at a predetermined interval.
In addition, the side excavation agitation unit 10 has a horizontal mounting member 28 in the left and right direction in which a plurality of agitation blades 30 are arranged in parallel, and an arm that protrudes in a radial direction from a boss part 26 fixedly provided on the motor output shaft 25. The side excavation agitator 20 is attached to the motor output shaft 25 of the front and rear hydraulic motors 21 and 22 that protrudes to both left and right sides of the case 17. The hydraulic motors 21 and 22 are provided in the rotation locus of the horizontal mounting member 28 of the side excavation agitator 20, respectively.

（実施形態の作用）
本発明は上記構成であり、掘削撹拌装置４の下部のケース１７には左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を前後一対設け、前後の側部掘削撹拌部１０は２機の油圧モーター２１と油圧モーター２２によりそれぞれ正逆回転して相対撹拌する構成としているので、２機の油圧モーター２１と油圧モーター２２とが互いに正逆回転し、撹拌翼３０にて相対撹拌でき、撹拌効率を向上させることができる。
また、左右の側部掘削撹拌部１０の間に設けた中央掘削撹拌部１２は、左右一対の掘削撹拌用トラックリンクチェーン１１とこの掘削撹拌用トラックリンクチェーン１１に取付けた中央掘削撹拌体３５とにより構成し、各掘削撹拌用トラックリンクチェーン１１には所定間隔をおいて掘削ビット３３を複数並設しているので、掘削撹拌用トラックリンクチェーン１１と中央掘削撹拌体３５はケース１７の下方を横断するように掘削撹拌移動して、地盤の平面の着底断面が増加させることができ、良質な改良柱状にすることができる。 (Action of embodiment)
The present invention has the above configuration, and the lower case 17 of the excavation agitation device 4 is provided with a pair of front and rear side excavation agitators 10 having a pair of left and right side excavation agitators 20, and the front and rear side excavation agitators 10 are Since the two hydraulic motors 21 and 22 rotate in forward and reverse directions to perform relative stirring, the two hydraulic motors 21 and 22 rotate in forward and reverse directions, and the stirring blades 30 perform relative stirring. It is possible to improve the stirring efficiency.
The central excavation agitation unit 12 provided between the left and right side excavation agitation units 10 includes a pair of left and right excavation agitation track link chains 11 and a central excavation agitation body 35 attached to the excavation agitation track link chains 11. Each excavation agitation track link chain 11 has a plurality of excavation bits 33 arranged in parallel at predetermined intervals. By moving the excavation and agitation in a transverse manner, it is possible to increase the bottoming section of the ground plane, and it is possible to form a high-quality improved columnar shape.

また、中央掘削撹拌部１２の掘削撹拌用トラックリンクチェーン１１は、側部掘削撹拌部１０を駆動する前後一対の油圧モーターの何れか一方の駆動力により回転させ、何れか他方の油圧モーターの駆動力は中央掘削撹拌部１２に伝達させない構成としたので、ケース１７の前後の互いに逆転する駆動歯車３７と下側受動ローラー４０とに、掘削撹拌用トラックリンクチェーン１１を掛け回す構成にしても、掘削撹拌用トラックリンクチェーン１１には一対の油圧モーターのうちの何れか一方の駆動回転のみが伝達されて駆動され、円滑に作動させることができ、そのため、中央掘削撹拌部１２の駆動機構を簡素に構成でき、合理的な構成とすることができる。
また、側部掘削撹拌部１０は、油圧モーター２１、２２により回転するモーター出力軸２５と平行な横取付部材２８の長さ方向に複数並設して回転する撹拌翼３０を有する側部掘削撹拌体２０を夫々設けているので、前後の側部掘削撹拌部１０により広範囲の地盤改良が可能になって、作業効率を向上させらることができる。 The excavation agitation track link chain 11 of the central excavation agitation unit 12 is rotated by the driving force of one of the front and rear hydraulic motors that drive the side excavation agitation unit 10, and the other hydraulic motor is driven. Since the configuration is such that the force is not transmitted to the central excavation agitation section 12, even if the excavation agitation track link chain 11 is wound around the drive gear 37 and the lower passive roller 40 that rotate in opposite directions at the front and rear of the case 17, The excavation agitation track link chain 11 is driven by only the drive rotation of either one of the pair of hydraulic motors being transmitted and can be operated smoothly. Therefore, the drive mechanism of the central excavation agitation section 12 is simplified. It can be configured to a reasonable configuration.
The side excavation agitation unit 10 also includes a plurality of agitation blades 30 that are arranged in parallel and rotated in the length direction of the horizontal mounting member 28 that is parallel to the motor output shaft 25 that is rotated by the hydraulic motors 21 and 22. Since the two bodies 20 are provided respectively, the front and rear side excavation and agitation parts 10 enable ground improvement over a wide range, and work efficiency can be improved.

また、前後一対の側部掘削撹拌部１０をそれぞれ駆動する油圧モーター２１、２２はそれぞれ独立して駆動する構成とし、かつ、油圧モーター２１と油圧モーター２２の油圧回路中にフローデバイダー４５を設けているので、油圧モーター２１、２２への送油流量を均等にし、撹拌効率を向上させることができる。
また、側部掘削撹拌部１０は、油圧モーター２１と油圧モーター２２のモーター出力軸２５を中心に回転する撹拌翼３０を設けて構成し、中央掘削撹拌部１２の中央掘削撹拌体３５は、少なくとも、撹拌翼３０の下側の回転軌跡と同じ高さ位置から、撹拌翼３０の上側の回転軌跡より所定間隔おいた上方位置を回転する構成としたので、掘削通過断面を全断面撹拌することで、土砂が常にほぐされ、貫入力低減が可能となる。 Further, the hydraulic motors 21 and 22 that respectively drive the pair of front and rear side excavation stirring parts 10 are configured to be driven independently, and a flow divider 45 is provided in the hydraulic circuit of the hydraulic motor 21 and the hydraulic motor 22. Therefore, the oil flow rate to the hydraulic motors 21 and 22 can be made equal, and the stirring efficiency can be improved.
The side excavation agitation unit 10 is configured by providing a hydraulic motor 21 and agitation blades 30 that rotate around the motor output shaft 25 of the hydraulic motor 22, and the central excavation agitation body 35 of the central excavation agitation unit 12 has at least Since the stirring blade 30 is configured to rotate from a position at the same height as the lower rotational trajectory to an upper position at a predetermined interval from the upper rotational trajectory of the stirring blade 30, by stirring the entire excavation passage cross section. , soil is constantly loosened, making it possible to reduce penetration force.

また、前記側部掘削撹拌部１０は、撹拌翼３０が複数並設された左右方向の横取付部材２８を、前記モーター出力軸２５に固定状態に設けたボス部２６に放射方向に突出するアーム部２７を介して取付けて側部掘削撹拌体２０を構成し、この側部掘削撹拌体２０を、前後一対の前記油圧モーター２１、２２の前記ケース１７の左右両側に突出するモーター出力軸２５のそれぞれに設け、油圧モーター２１、２２は前記側部掘削撹拌体２０の横取付部材２８の回転軌跡内に設けているので、前後の側部掘削撹拌部１０を小型に構成することができる。
改良しようとする軟弱地盤に左右および前後一対の計４個の側部掘削撹拌部１０と中央掘削撹拌部１２とを駆動しつつ掘削撹拌装置４を降下させるとともに、土壌改良剤ホース６を通じて支持部材５の下部の中間吐出口と下側吐出口４９からセメントミルク等の土壌改良剤（硬化剤・セメントミルク）を地盤内に注入し、エア排出口４９からエアを噴出させて地盤内での左右および前後一対の側部掘削撹拌部１０と中央掘削撹拌部１２とにより地盤を掘削すると同時に土砂と土壌改良剤とを撹拌混合する。 In addition, the side excavation agitation unit 10 has a horizontal mounting member 28 in the left and right direction in which a plurality of agitation blades 30 are arranged in parallel, and an arm that protrudes in a radial direction from a boss part 26 fixedly provided on the motor output shaft 25. The side excavation agitator 20 is attached to the motor output shaft 25 of the front and rear hydraulic motors 21 and 22 that protrudes to both left and right sides of the case 17. Since the hydraulic motors 21 and 22 are provided within the rotation locus of the horizontal mounting member 28 of the side excavation agitator 20, the front and rear side excavation agitators 10 can be configured to be compact.
The excavation agitation device 4 is lowered onto the soft ground to be improved while driving a total of four side excavation agitation units 10 (left and right and front and back pairs) and a central excavation agitation unit 12, and the soil conditioner hose 6 is passed through the support member. A soil conditioner such as cement milk (hardening agent/cement milk) is injected into the ground from the intermediate discharge port and the lower discharge port 49 at the bottom of the unit 5, and air is ejected from the air discharge port 49 to spread the left and right parts in the ground. A pair of front and rear side excavation and agitation units 10 and a central excavation and agitation unit 12 simultaneously excavate the ground and simultaneously agitate and mix earth and sand and a soil conditioner.

次に、図８のように、掘削撹拌装置４をベースマシン１のアーム２を操作して、掘削撹拌装置４を後側（ベースマシン１側）に移動させて掘削撹拌作業を行なって、所要範囲の地盤を改良する。
この場合、撹拌混合装置４を地盤に挿入した状態で、アーム２によりベースマシン１に対して撹拌混合装置４を前後左右に移動させて、撹拌混合作業を行うことも可能であり、地盤改良予定地の地盤改良作業の作業効率を向上させられる。
また、この所要範囲の地盤の掘削撹拌作業後に、ベースマシン１自体を移動させて掘削撹拌作業を行なってもよく、作業順序は任意であり、アーム２の操作による掘削撹拌装置４の移動と、ベースマシン１自体の移動による掘削撹拌装置４の移動とを組合せて、地盤の掘削撹拌作業を行ってもよい。 Next, as shown in FIG. 8, by operating the arm 2 of the base machine 1, the excavation agitation device 4 is moved to the rear side (toward the base machine 1 side) and excavation agitation work is performed. Improve the ground in the area.
In this case, with the stirring and mixing device 4 inserted into the ground, it is also possible to move the stirring and mixing device 4 back and forth and left and right with respect to the base machine 1 using the arm 2 to carry out stirring and mixing work, which is planned for soil improvement. The work efficiency of ground improvement work can be improved.
Further, after the excavation and agitation work of the ground in the required range, the base machine 1 itself may be moved to perform the excavation and agitation work, and the work order is arbitrary, and the excavation agitation device 4 is moved by operating the arm 2, The ground excavation and agitation work may be performed by combining the movement of the excavation and agitation device 4 with the movement of the base machine 1 itself.

また、この所要範囲の地盤の掘削撹拌作業後に、掘削撹拌装置４を一旦上昇させて、ベースマシン１を移動させて、順次上記掘削撹拌作業を反復して行なうことにより所要範囲の地盤を改良してもよい。
掘削撹拌装置４は、吊下げフレーム５の下部に設けた取付フレーム１５に取付けたケース１７に、左右一対の側部掘削撹拌体２０を有する側部掘削撹拌部１０を前後一対設けて構成し、側部掘削撹拌体２０は吊下げフレーム５の下部の取付フレーム１５の一対の縦筒部１６の外面側に設けたケース１７に中空状の油圧モーター２１、２２を夫々設け、油圧モーター２１、２２の中心の出力軸モーター出力軸２５の外側所定部分に設けたボス部２６には放射方向に突出するアーム部２７の基部を固定し、アーム部２７の先端側に設けたモーター出力軸２５と平行の横取付部材２８に放射方向に突出する撹拌翼３０を横取付部材２８の長さ方向に所定間隔をおいて複数並設して構成しているので、油圧モーター２１、２２が駆動すると側部掘削撹拌部１０の側部掘削撹拌体２０の撹拌翼３０が回転して地盤を掘削しながら撹拌し、土壌改良剤と土砂とを撹拌混合する。 Further, after the excavation and stirring work of the ground in the required range, the excavation and stirring device 4 is raised once, the base machine 1 is moved, and the above-mentioned excavation and stirring work is sequentially repeated to improve the ground in the required range. You can.
The excavation agitation device 4 includes a case 17 attached to a mounting frame 15 provided at the lower part of the hanging frame 5, and a pair of front and rear side excavation agitators 10 each having a pair of left and right side excavation agitators 20. The side excavation agitator 20 is provided with hollow hydraulic motors 21 and 22 in a case 17 provided on the outer surface of a pair of vertical cylinders 16 of the lower mounting frame 15 of the hanging frame 5, respectively. The base of an arm part 27 that protrudes in the radial direction is fixed to a boss part 26 provided at a predetermined outer part of the output shaft motor output shaft 25 at the center of Since a plurality of stirring blades 30 protruding radially from the horizontal mounting member 28 are arranged in parallel at predetermined intervals in the length direction of the horizontal mounting member 28, when the hydraulic motors 21 and 22 are driven, the side parts The stirring blades 30 of the side excavation agitator 20 of the excavation agitator 10 rotate and agitate the ground while excavating it, thereby stirring and mixing the soil conditioner and earth and sand.

しかして、吊下げフレーム５の下方となるケース１７には、掘削撹拌装置４の中央掘削撹拌部１２を設けているので、撹拌が充分行いにくい吊下げフレーム５（ケース１７）の下方の地盤の掘削撹拌を実行し、撹拌効率を向上させると共に、土壌全体の撹乱混合を均一化させられる。
即ち、中央掘削撹拌部１２は、吊下げフレーム５の下方に位置するので、側部掘削撹拌部１０と共に土壌の撹拌を行うことができ、撹拌効率を向上させる。
中央掘削撹拌部１２は、ケース１７に設けた左右一対の掘削ビット３３を有する掘削撹拌用トラックリンクチェーン１１により構成しているので、掘削撹拌用トラックリンクチェーン１１が回転して吊下げフレーム５の下方の地盤の掘削撹拌を行う。 However, since the central excavation agitation section 12 of the excavation agitation device 4 is provided in the case 17 below the hanging frame 5, the ground below the hanging frame 5 (case 17) is difficult to stir sufficiently. Excavation and agitation can be performed to improve agitation efficiency and to even out the disturbance and mixing throughout the soil.
That is, since the central excavation and agitation section 12 is located below the hanging frame 5, it can agitate the soil together with the side excavation and agitation section 10, thereby improving the agitation efficiency.
The central excavation agitation section 12 is constituted by the excavation agitation track link chain 11 having a pair of left and right excavation bits 33 provided in the case 17, so that the excavation agitation track link chain 11 rotates to rotate the suspension frame 5. Excavation and agitation of the ground below.

中央掘削撹拌部１２は、左右の掘削撹拌用トラックリンクチェーン１１に掛け渡した中央掘削撹拌体３５を、掘削撹拌用トラックリンクチェーン１１の回転方向に複数所定間隔おいて並設しているので、中央掘削撹拌体３５によっても、吊下げフレーム５の下方の地盤の掘削撹拌を行うことができ、混合撹拌効率を向上させられる。
したがって掘削撹拌装置４は、前後左右の４個の側部掘削撹拌部１０と中央掘削撹拌部１２により左右の側部掘削撹拌体２０で構成する所謂ツイン型と称される掘削撹拌装置４であっても、土壌全体の撹乱混合を均一化させられ、しかも、このツイン型と称される側部掘削撹拌体２０を前後一対設け、この前後一対の側部掘削撹拌体２０の中央を中央掘削撹拌部１２で混合撹拌するので、一層広範囲な地盤改良をすることができる。 The central excavation agitation unit 12 has a plurality of central excavation agitation bodies 35 that are stretched over the left and right excavation agitation track link chains 11 and arranged in parallel at predetermined intervals in the rotational direction of the excavation agitation track link chains 11. The central excavation and agitation body 35 can also perform excavation and agitation of the ground below the hanging frame 5, thereby improving the mixing and agitation efficiency.
Therefore, the excavation agitation device 4 is a so-called twin type excavation agitation device 4, which is composed of four side excavation agitation sections 10 on the front, rear, left and right sides, and left and right side excavation agitation bodies 20 formed by a central excavation agitation section 12. In addition, a pair of side excavation agitators 20 called twin type are provided at the front and rear, and the center of the pair of front and rear side excavation agitators 20 is connected to the central excavation agitator. Since the mixture is mixed and stirred in section 12, it is possible to improve the ground over a wider range.

中央掘削撹拌部１２は上側部分のケース１７に左右一対設けた受動歯車３６に対峙するようにケース１７の下側部分に設けた左右のモーター出力軸２５のボス部２６に駆動歯車３７を設け、受動歯車３６と駆動歯車３７の間に掘削撹拌用トラックリンクチェーン１１を掛け回し、かつ、側部掘削撹拌部１０Ａまたは側部掘削撹拌部１０Ｂの何れか一方のボス部２６に駆動歯車３７を設け、何れか他方のボス部２６にはボス部２６の駆動回転を伝達させない滑り軸受（アイドラ）３９を介して設けた下側受動ローラー４０を設けているので、掘削撹拌用トラックリンクチェーン１１は油圧モーター２１または油圧モーター２２の一方の駆動回転が伝達されて駆動される。 The central excavation agitation unit 12 has a drive gear 37 provided on the boss portion 26 of the left and right motor output shafts 25 provided in the lower part of the case 17 so as to face a pair of left and right driven gears 36 provided in the case 17 in the upper part. The excavation and agitation track link chain 11 is routed between the passive gear 36 and the drive gear 37, and the drive gear 37 is provided on the boss section 26 of either the side excavation and agitation section 10A or the side excavation and agitation section 10B. Since a lower passive roller 40 is provided on the other boss portion 26 via a sliding bearing (idler) 39 that does not transmit the drive rotation of the boss portion 26, the track link chain 11 for excavation agitation is hydraulically operated. The drive rotation of either the motor 21 or the hydraulic motor 22 is transmitted and driven.

１…ベースマシン、２…アーム、３…ブラケット、４…掘削撹拌装置、５…フレーム、６…土壌改良剤ホース、７…エアホ－ス、８…油圧ホース、１０…側部掘削撹拌部、１１…掘削撹拌用トラックリンクチェーン、１２…中央掘削撹拌部、１４…横筒部、１５…取付フレーム、１６…縦筒部、１７…ケース、２０…側部掘削撹拌体、２１…油圧モーター、２２…油圧モーター、２５…モーター出力軸、２６…ボス部、２７…アーム部、２８…横取付部材、３０…撹拌翼、３３…掘削ビット、３５…中央掘削撹拌体、３６…受動歯車、３７…駆動歯車、３９…滑り軸受、４０…下側受動ローラー、４５…フローデバイダー、４６…油タンク、４７…油圧ポンプ、４８…切替バルブ、４９…吐出口、５０…テンションローラー、５１…テンションアーム、５２…回転支点軸、５３…伸縮部材。 DESCRIPTION OF SYMBOLS 1... Base machine, 2... Arm, 3... Bracket, 4... Excavation stirring device, 5... Frame, 6... Soil conditioner hose, 7... Air hose, 8... Hydraulic hose, 10... Side excavation stirring part, 11 ...Track link chain for excavation stirring, 12...Central excavation stirring part, 14...Horizontal tube part, 15...Mounting frame, 16...Vertical tube part, 17...Case, 20...Side excavation stirring body, 21...Hydraulic motor, 22 ...Hydraulic motor, 25...Motor output shaft, 26...Boss part, 27...Arm part, 28...Horizontal mounting member, 30...Agitation blade, 33...Drilling bit, 35...Central excavation stirring body, 36...Passive gear, 37... Drive gear, 39... Sliding bearing, 40... Lower passive roller, 45... Flow divider, 46... Oil tank, 47... Hydraulic pump, 48... Switching valve, 49... Discharge port, 50... Tension roller, 51... Tension arm, 52... Rotation fulcrum shaft, 53... Telescopic member.

Claims

A case 17 is provided at the lower part of the hanging frame 5 of the excavation agitation device 4 that is attached to the arm 2 of the base machine 1 that can freely travel. A ground improvement device is provided with a pair of front and rear side excavation stirring parts, and the front and rear side excavation stirring parts 10 are configured to rotate forward and reverse to each other by two hydraulic motors 21 and 22 to relatively stir the ground.

In claim 1, a central excavation and agitation section 12 for excavating and agitating the ground between the left and right side excavation and agitation sections 10 is provided between the left and right side excavation and agitation sections 10, and the central excavation and agitation section 12 is arranged between the left and right side excavation and agitation sections 10. It consists of a pair of left and right excavation agitation track link chains 11 provided at the left and right excavation agitation track link chains 17 and a central excavation agitation body 35 that spans the left and right excavation agitation track link chains 11. This is a ground improvement device in which a plurality of excavation bits 33 are arranged in parallel with each other, and a plurality of central excavation agitators 35 are arranged in parallel at predetermined intervals in the rotational direction of the excavation agitation track link chain 11.

In claim 2, the excavation agitation track link chain 11 of the central excavation agitation section 12 is configured to rotate by the driving force of one of a pair of front and rear hydraulic motors that respectively drive the front and rear side excavation agitation sections 10, This ground improvement device is configured such that the driving force of the other hydraulic motor out of a pair of front and rear hydraulic motors is not transmitted to the central excavation stirring section 12.

In claim 3, the side excavation stirring section 10 includes a plurality of stirring blades 30 projecting in the radial direction on a horizontal mounting member 28 in the left and right direction parallel to the left and right motor output shafts 25 of the front and rear pair of hydraulic motors 21 and 22. This soil improvement device is constructed by arranging a plurality of horizontal mounting members 28 and stirring blades 30 in parallel in the rotational direction of the motor output shaft 25.

In claim 4, the hydraulic motors 21 and 22 that respectively drive the pair of front and rear side excavation and stirring parts 10 are configured to be driven independently, and a flow divider is provided in the hydraulic circuit of the hydraulic motor 21 and the hydraulic motor 22. Ground improvement device equipped with 45.

In claim 5, the side excavation stirring section 10 is configured by providing a hydraulic motor 21 and a stirring blade 30 that rotates around a motor output shaft 25 of a hydraulic motor 22, and the central excavation agitation body of the central excavation stirring section 12 Reference numeral 35 denotes a soil improvement device configured to rotate at least from a position at the same height as the lower rotational locus of the stirring blade 30 to a position above the upper rotational locus of the stirring blade 30 at a predetermined interval.

In claim 6, the side excavation stirring section 10 includes a horizontal mounting member 28 in the left and right direction, in which a plurality of stirring blades 30 are arranged in parallel, to a boss section 26 fixed to the motor output shaft 25 in a radial direction. The side excavation agitator 20 is configured by being attached via the protruding arm portion 27, and the side excavator agitator 20 is connected to the front and rear hydraulic motors 21 and 22 by motor outputs that protrude to both left and right sides of the case 17. The ground improvement device is provided on each of the shafts 25, and the hydraulic motors 21 and 22 are provided within the rotation locus of the horizontal mounting member 28 of the side excavation agitator 20.