JP2019065604A - Excavation and agitation device - Google Patents

Excavation and agitation device Download PDF

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JP2019065604A
JP2019065604A JP2017192959A JP2017192959A JP2019065604A JP 2019065604 A JP2019065604 A JP 2019065604A JP 2017192959 A JP2017192959 A JP 2017192959A JP 2017192959 A JP2017192959 A JP 2017192959A JP 2019065604 A JP2019065604 A JP 2019065604A
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blade
stirring
blades
drilling
digging
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JP6891088B2 (en
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修一 新町
Shuichi Shinmachi
修一 新町
元二 渡辺
Motoji Watanabe
元二 渡辺
倫太郎 奥野
Rintaro Okuno
倫太郎 奥野
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Japan Foundation Engineering Co Ltd
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Japan Foundation Engineering Co Ltd
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Abstract

To provide an excavation and agitation device which uniformly agitates and mixes excavated soil and a chemical while preventing generation of corotation phenomenon.SOLUTION: An excavation and agitation device comprises: excavation blades 31 including a plurality of blades 33 extending in a radial direction with respect to a rotation center; a plurality of arms 35 respectively disposed above the plurality of blades 33 and extending in the radial direction from the rotation center; first agitation blades disposed at a plurality of positions in a rotation axis direction of the excavation blades 31 between the plurality of arms 35 and the excavation blades 31 and rotating in a direction opposite to the excavation blades 31; connection portions 36 which include intake portions 36a taking soil excavated by rotation of the excavation blades 31 in toward the first agitation blades and having a shape tapering-off toward tip sides of rotation direction of the excavation blades 31 and which connects tip portion of each arm in the plurality of arms 35 with tip portions of each blade included by the excavation blades 31; and corotation preventing blades provided in the connection portions 36 and extending between movement loci of the first agitation blades neighboring in the rotation axis direction of the excavation blades 31 among the first agitation blades.SELECTED DRAWING: Figure 3

Description

本発明は、地盤中にセメントミルク等の薬液を注入しながら掘削土と薬液とを攪拌混合し、地盤中に円柱状のセメントコラムを生成し、地盤改良を行う掘削攪拌装置に関する。   The present invention relates to a digging and stirring apparatus that stirs and mixes excavated soil and a chemical solution while injecting a chemical solution such as cement milk into the ground, generates a columnar cement column in the ground, and improves the ground.

地盤の地耐力を増強する方法として、回転する掘削翼にて地盤を掘削し、掘削した土壌(以下、掘削土)にセメントミルク等の薬液を注入しながら、掘削翼とともに回転する攪拌翼により掘削土と薬液とを攪拌混合し、地盤中に円柱状のセメントコラムを形成する地盤改良方法が用いられる。   The ground is excavated with a rotating excavating blade as a method of enhancing the ground resistance of the ground, and while injecting a chemical solution such as cement milk into excavated soil (hereinafter referred to as excavated soil), excavating by a stirring vane rotating with the excavating wing The ground improvement method of stirring and mixing the soil and the chemical solution to form a cylindrical cement column in the ground is used.

上述した方法では、地盤に粘土層が含まれる場合には、回転する掘削翼や攪拌翼に掘削土が付着し、攪拌翼や掘削翼とともに同期回転する、所謂、共回り現象が発生しやすい。共回り現象が発生すると、掘削土と薬液とが均一に攪拌混合されず、良質なセメントコラムを形成することができない。そこで、掘削翼の回転による地盤の掘削時に形成される掘削孔の内壁面に差し込まれる共回り防止翼を設けることが提案されている。(特許文献1参照)。   In the method described above, when the ground contains a clay layer, the excavated soil adheres to the rotating digging blade or the stirring blade, and a so-called corotation phenomenon tends to occur, which rotates synchronously with the stirring blade or the drilling blade. When the co-rotation phenomenon occurs, the excavated soil and the chemical solution are not uniformly stirred and mixed, and a high quality cement column can not be formed. Therefore, it has been proposed to provide a co-rotation preventing blade which is inserted into the inner wall surface of the drilling hole formed when the ground is excavated by the rotation of the drilling blade. (See Patent Document 1).

特開2014−122495号公報JP, 2014-122495, A

例えば特許文献1に開示される共回り防止翼は、共回り防止翼の先端部が掘削翼の回転軌跡よりも外側に突出する張出し部を有し、掘削翼の回転により地盤を掘削する時に、張出し部が地盤に差し込まれる。これにより、掘削翼や攪拌翼が回転している間も共回り防止翼が回転しない状態が維持され、共回り防止翼が、掘削翼や攪拌翼により攪拌される掘削土の塊を破砕する。   For example, the co-rotation preventing blade disclosed in Patent Document 1 has a projecting portion in which the tip of the co-rotation preventing blade protrudes outside the rotational trajectory of the digging blade, and when excavating the ground by the rotation of the digging blade, The overhang is inserted into the ground. As a result, the anti-corotation blade is maintained in a non-rotating state while the digging blade or the stirring blade is rotating, and the co-rotation preventing blade breaks up a lump of excavated soil which is stirred by the digging blade or the mixing blade.

しかしながら、上述した共回り防止翼は、掘削翼の回転による地盤の掘削時に、張出し部が地盤を切削しながら地盤に差し込まれることから、張出し部に生じる掘進抵抗が大きく、目的の深さまで地盤を掘削する作業に時間がかかるという問題がある。また、差し込まれた張出し部の把持力や強度などが不足する地盤では、張出し部が差し込まれる過程で地盤が崩れ、共回り防止翼を地盤に固定できない。したがって、共回り防止翼が掘削翼や攪拌翼に追随して回転しまい、上述した共回り現象の発生を防止することができず、また、掘削土と薬液とを均一に攪拌混合させることが困難となる。   However, since the overhanging portion is inserted into the ground while cutting the ground when excavating the ground due to the rotation of the drilling blade, the common rotation preventing wing mentioned above has a large resistance to digging in the overhanging portion, and the ground to a desired depth There is a problem that it takes time to excavate. In addition, on the ground where the holding force and strength of the inserted extension are insufficient, the ground collapses in the process of inserting the extension and the co-rotation preventing wing can not be fixed to the ground. Therefore, the anti-corotation blade rotates following the digging blade and the stirring blade, so that the occurrence of the co-rotation phenomenon described above can not be prevented, and it is difficult to uniformly stir and mix the excavated soil and the chemical solution It becomes.

本発明は、共回り現象の発生を防止しながら、掘削土と薬液とを均一に攪拌混合させることができるようにした掘削攪拌装置を提供することを目的としている。   An object of the present invention is to provide a digging and stirring apparatus capable of uniformly stirring and mixing excavated soil and a chemical solution while preventing occurrence of a corotation phenomenon.

上述した課題を解決するために、本発明の掘削攪拌装置は、回転中心に対して径方向に延出される複数の羽根を有する掘削翼と、前記掘削翼が有する前記複数の羽根の上方に各々配置され、前記回転中心から径方向に延出される複数のアームと、前記複数のアームと前記掘削翼との間で、前記掘削翼の回転軸方向の複数の位置に配置され、前記掘削翼とは逆方向に回転する第1の攪拌翼と、前記掘削翼の回転により掘削された土壌を前記第1の攪拌翼に向けて取り込む、前記掘削翼の回転方向の先端側に向けて先細りする形状の取込部を有し、前記複数のアームの各アームの先端部と前記掘削翼が有する各羽根の先端部とを連結する連結部材と、前記連結部材に設けられ、前記第1の攪拌翼のうち、前記掘削翼の回転軸方向において隣り合う前記第1の攪拌翼の移動軌跡間に延出される共回り防止翼と、を含むことを特徴とする。   In order to solve the problems described above, according to the drilling and stirring apparatus of the present invention, a digging wing having a plurality of vanes extending radially with respect to a rotation center, and above the plurality of vanes of the digging wing are respectively provided. A plurality of arms disposed radially extending from the rotation center, and disposed at a plurality of positions in the rotational axis direction of the digging blade between the plurality of arms and the digging wing, A first stirring blade that rotates in the reverse direction, and a shape that tapers toward the tip side in the rotational direction of the drilling blade that takes in soil toward the first stirring blade, which is excavated by the rotation of the drilling blade A connecting member for connecting the tip of each arm of the plurality of arms and the tip of each blade of the excavating blade, and the connecting member; Adjacent to each other in the rotational axis direction of the drilling blade A co-rotation preventing blade is extended between the moving locus of the serial first stirring blade, characterized in that it comprises a.

また、前記複数の羽根は、前記回転中心から径方向に水平に延出される本体部と、前記掘削翼の回転方向における前記本体部の先端側から下り傾斜する傾斜部を各々有し、前記複数のアームの各アームは、装置の上面視において、対応する羽根の前記傾斜部のうち、少なくとも前記掘削翼の回転方向の先端側で且つ前記径方向の先端部分を露呈するように配設され、前記取込部は、前記装置の上面視において前記アームから露呈される前記傾斜部の少なくとも前記掘削翼の回転方向の先端側で且つ前記径方向の先端部分に向けて突出するとを特徴とする。   Each of the plurality of blades has a main body extending horizontally in the radial direction from the rotation center, and an inclined portion which is inclined downward from the tip end of the main body in the rotational direction of the digging wing, Each of the arms is disposed so as to expose at least the tip of the corresponding blade in the rotational direction and the radial tip portion of the inclined portion of the corresponding blade in a top view of the device, The intake portion is characterized in that it projects toward the tip end portion in the rotational direction of at least the excavated blade in the rotational direction of the inclined portion exposed from the arm in top view of the device and toward the tip portion in the radial direction.

ここで、前記第1の攪拌翼のうち、少なくとも前記掘削翼に近接した前記第1の攪拌翼に設けられ、前記第1の攪拌翼による前記土壌の攪拌時に、攪拌される前記土壌に混合する薬液を吐出する吐出部を有することを特徴とする。   Here, among the first stirring blades, it is provided on at least the first stirring blade close to the digging blade, and is mixed with the soil to be stirred when the soil is stirred by the first stirring blade It has a discharge part which discharges a medical fluid.

この場合、前記吐出部は、前記回転中心に対して前記径方向に前記薬液を前記土壌に吐出することが好ましい。また、前記吐出部は、前記第1の攪拌翼の回転方向における後端側から前記薬液を前記土壌に吐出することが好ましい。   In this case, the discharge unit preferably discharges the chemical solution to the soil in the radial direction with respect to the rotation center. Moreover, it is preferable that the said discharge part discharges the said chemical | medical solution to the said soil from the rear end side in the rotation direction of a said 1st stirring blade.

また、前記第1の攪拌翼が外周面に設けられた回転軸の一端部に固定され、前記回転軸の回転時に前記土壌に圧入する薬液を吐出する吐出口を外周面に備えた削孔ビットを、有することを特徴とする。   Also, a drilling bit is provided on an outer peripheral surface of the first stirring blade fixed to one end of a rotating shaft provided on the outer peripheral surface and discharging a chemical solution to be pressed into the soil when the rotating shaft rotates. It is characterized by having.

なお、前記薬液の注入時に、送り込まれる前記薬液の押圧を受けて前記吐出口を開放し、前記薬液の注入が停止されたことを受けて前記吐出口を遮蔽する遮蔽部材を有することが好ましい。   In addition, it is preferable to have the shielding member which receives the pressure of the said chemical solution sent in at the time of injection | pouring of the said chemical solution, opens the said discharge port, and receiving that injection of the said chemical solution was stopped, shielding the said discharge port.

また、前記複数のアームを一端に保持して、回転時の駆動力を前記複数のアームを介して前記掘削翼に伝達する駆動軸を有し、前記駆動軸は、一端に保持される前記複数のアームの上方に、前記掘削翼と同一方向に回転する第2の攪拌翼を備えることが好ましい。   Further, it has a drive shaft for holding the plurality of arms at one end and transmitting a driving force at the time of rotation to the digging wing via the plurality of arms, and the plurality of drive shafts are held at one end Preferably, a second stirring blade is provided above the arm in the direction of rotation in the same direction as the digging blade.

本発明によれば、共回り現象の発生を防止しながら、掘削土と薬液とを均一に攪拌混合させることができる。   According to the present invention, it is possible to uniformly stir and mix the excavated soil and the chemical solution while preventing the occurrence of the rotation phenomenon.

地盤改良施工機の一例を示す模式図である。It is a schematic diagram which shows an example of a ground improvement construction machine. 本実施形態の掘削攪拌装置の一例を示す斜視図である。It is a perspective view which shows an example of the excavation stirring apparatus of this embodiment. 掘削翼及び攪拌翼の構成を分解して示す斜視図である。It is a perspective view which decomposes | disassembles and shows the structure of a drilling blade and a stirring blade. 掘削攪拌装置の正面図である。It is a front view of a drilling agitator. 掘削攪拌装置の上面図である。It is a top view of a drilling stirrer. (a)は図4に示すA−A断面図、(b)は図4に示すB−B断面図である。(A) is AA sectional drawing shown in FIG. 4, (b) is BB sectional drawing shown in FIG. 下部攪拌翼の下方に設けられた吐出部の構成を示す図である。It is a figure which shows the structure of the discharge part provided below the lower stirring blade. 回転軸及び削孔ビットの一例を示す部分断面図である。It is a fragmentary sectional view showing an example of a rotating shaft and a drilling bit. 本実施形態の掘削攪拌装置を用いた地盤改良方法の流れを示す図である。It is a figure which shows the flow of the ground improvement method using the excavation stirring apparatus of this embodiment.

以下、本実施形態について、図面を用いて説明する。図1に示すように、地盤改良施工機10は、自走可能な機体11、機体11に鉛直姿勢に支持されるリーダー12、リーダー12に沿って昇降する昇降台13、昇降台13に配置した回転駆動部14、駆動軸20を軸支する下部ホルダ15、及び駆動軸20の内軸21に設けた送出路と図示を省略したポンプとを接続するためのスイベル16を有する。   Hereinafter, the present embodiment will be described using the drawings. As shown in FIG. 1, the ground improvement construction machine 10 is disposed on a self-propelled machine body 11, a leader 12 supported in a vertical posture by the machine body 11, a lift 13 moving up and down along the leader 12, and a lift 13 It has a rotary drive portion 14, a lower holder 15 for supporting the drive shaft 20, and a swivel 16 for connecting a delivery path provided on the inner shaft 21 of the drive shaft 20 and a pump (not shown).

回転駆動部14は、本実施形態の掘削攪拌装置30が装着された駆動軸20を回転させる。駆動軸20は、内軸21と、内軸21が挿入される外軸22とを有する。したがって、回転駆動部14は、内軸21を回転させる駆動部14aと、外軸22を回転させる駆動部14bとを有する構成である。図2に示すように、これら2つの駆動部14a及び駆動部14bを備えた回転駆動部14により、駆動軸20の内軸21は回転軸Lを中心に図2中F方向に回転する。一方、駆動軸20の外軸22は、回転軸Lを中心に駆動軸20の内軸21とは反対方向(図2中G方向)に回転する。駆動軸20の内軸21及び外軸22は、掘削する地盤の深さに応じて複数連結することが可能である。上述した駆動軸20の内軸21は、後述する回転軸40に設けた第1薬液通路と、第2薬液通路とに個別に薬液を送り込むための二重管構造の送込路を有する。   The rotation drive unit 14 rotates the drive shaft 20 on which the drilling and stirring apparatus 30 of the present embodiment is mounted. The drive shaft 20 has an inner shaft 21 and an outer shaft 22 into which the inner shaft 21 is inserted. Therefore, the rotation drive unit 14 is configured to have a drive unit 14 a that rotates the inner shaft 21 and a drive unit 14 b that rotates the outer shaft 22. As shown in FIG. 2, the inner shaft 21 of the drive shaft 20 is rotated in the F direction in FIG. 2 around the rotation axis L by the rotary drive unit 14 provided with the two drive units 14 a and 14 b. On the other hand, the outer shaft 22 of the drive shaft 20 rotates around the rotation axis L in a direction (G direction in FIG. 2) opposite to the inner shaft 21 of the drive shaft 20. A plurality of inner shafts 21 and outer shafts 22 of the drive shaft 20 can be connected according to the depth of the ground to be excavated. The inner shaft 21 of the drive shaft 20 described above has a double-piped delivery passage for separately feeding a chemical solution to a first chemical solution passage provided on a rotating shaft 40 described later and a second chemical solution passage.

図2に示すように、最下端に位置する駆動軸20の外軸22の下端部には、例えば3枚の攪拌翼25が例えば120°間隔で配設される。3枚の攪拌翼25は、駆動軸20の軸方向において、一例として、同一の位置に設けられる。これら3枚の攪拌翼25の回転軌跡における直径は、一例として2429mmである。なお、攪拌翼25の枚数は、3枚に限定される必要はなく、2枚又は4枚であってもよい。   As shown in FIG. 2, for example, three stirring blades 25 are disposed at intervals of 120 °, for example, at the lower end portion of the outer shaft 22 of the drive shaft 20 positioned at the lowermost end. The three stirring blades 25 are provided, for example, at the same position in the axial direction of the drive shaft 20. The diameter of the rotation trajectory of the three stirring blades 25 is, for example, 2429 mm. The number of stirring blades 25 need not be limited to three, and may be two or four.

掘削攪拌装置30は、最下端に位置する駆動軸20の下端部に装着される。図3から図6に示すように、掘削攪拌装置30は、掘削翼31を有する。掘削翼31は、円筒部32、3枚の羽根33、嵌入部34、3個のアーム35及び連結部36を有する。なお、本実施形態では、掘削翼31の構成を、円筒部32、3枚の羽根33、嵌入部34、3個のアーム35及び連結部36としているが、円筒部32及び3枚の羽根33を掘削翼とし、嵌入部34、3個のアーム35及び連結部36を別の構成としてもよい。   The drilling and stirring apparatus 30 is mounted on the lower end portion of the drive shaft 20 located at the lowermost end. As shown in FIGS. 3 to 6, the digging and stirring apparatus 30 has a digging wing 31. The digging wing 31 has a cylindrical portion 32, three blades 33, an insertion portion 34, three arms 35 and a connecting portion 36. In this embodiment, the configuration of the excavating wing 31 is the cylindrical portion 32, the three blades 33, the insertion portion 34, the three arms 35, and the connecting portion 36. However, the cylindrical portion 32 and the three blades 33 The digging wing may be used, and the insertion portion 34, the three arms 35 and the connection portion 36 may be configured differently.

円筒部32は、後述する回転軸40の下端部を軸支する。円筒部32の外周面には、3枚の羽根33が設けられる。なお、3枚の羽根33は、円筒部32の外周面から円周方向に120°間隔を空けて径方向に延出されている。ここで、羽根33の枚数を3枚としているが、羽根33の枚数は、これに限定されるものではなく、2枚又は4枚であってもよい。羽根33は、円筒部32の径方向に水平に延出される本体部33aと、掘削翼31の回転方向における本体部33aの先端側から下り傾斜する傾斜部33bとを有する。傾斜部33bは、複数の掘削刃37を径方向に配設する。なお、掘削刃37が6個設けられた羽根33について開示しているが、各羽根33に設ける掘削刃37の数は、6個に限定されるものではない。この掘削刃37は、羽根33に対して、先端が異なる種々の掘削刃に交換することができるようにしてもよいし、羽根33に固定されるものであってもよい。なお、3枚の羽根33の回転軌跡における直径は、一例として2550mmである。   The cylindrical portion 32 pivotally supports a lower end portion of a rotating shaft 40 described later. Three blades 33 are provided on the outer peripheral surface of the cylindrical portion 32. The three blades 33 extend radially from the outer peripheral surface of the cylindrical portion 32 at intervals of 120 ° in the circumferential direction. Here, although the number of blades 33 is three, the number of blades 33 is not limited to this, and may be two or four. The blade 33 has a main body portion 33 a extending horizontally in the radial direction of the cylindrical portion 32 and an inclined portion 33 b inclined downward from the tip end side of the main body portion 33 a in the rotational direction of the digging wing 31. The inclined portion 33 b radially arranges a plurality of digging blades 37. In addition, although disclosed about the blade | wing 33 in which six digging blades 37 were provided, the number of the digging blades 37 provided in each blade | wing 33 is not limited to six. The cutting blade 37 may be replaced with various cutting blades having different tips with respect to the blade 33, or may be fixed to the blade 33. In addition, the diameter in the rotation locus | trajectory of the blade | wing 33 of 3 sheets is 2550 mm as an example.

嵌入部34は、円筒形状の部材である。嵌入部34は、円筒部32の上方で、且つ円筒部32と同軸に保持される。嵌入部34は、駆動軸20の外軸22の嵌入部22aに嵌め込まれた状態で駆動軸20の外軸22に接続される。嵌入部34の内部空間は、駆動軸20の内軸21が挿通される空間である。   The insertion portion 34 is a cylindrical member. The insertion portion 34 is held above the cylindrical portion 32 and coaxial with the cylindrical portion 32. The insertion portion 34 is connected to the outer shaft 22 of the drive shaft 20 in a state of being inserted into the insertion portion 22 a of the outer shaft 22 of the drive shaft 20. The internal space of the insertion portion 34 is a space through which the inner shaft 21 of the drive shaft 20 is inserted.

アーム35は、嵌入部34の下端部から、嵌入部34の円周方向に120°間隔を空けて、嵌入部34の径方向に延出される。アーム35は、3個の羽根33の各々の上方に配置される。アーム35は、幅方向の中心が幅方向における両端部よりも上方に突出した、所謂、山形状の部材である。上述したように、駆動軸20の外軸22の嵌入部22aに嵌め込まれる。したがって、アーム35は、駆動軸20を回転したときに、駆動軸20の回転力を掘削翼31に伝達する機能を有する。また、この他に、アーム35は、掘削攪拌装置30による掘削時に、掘削土を攪拌する機能も有する。   The arm 35 extends from the lower end portion of the insertion portion 34 in the radial direction of the insertion portion 34 at an interval of 120 ° in the circumferential direction of the insertion portion 34. An arm 35 is disposed above each of the three vanes 33. The arm 35 is a so-called mountain-shaped member in which the center in the width direction protrudes upward beyond both end portions in the width direction. As described above, it is fitted into the fitting portion 22 a of the outer shaft 22 of the drive shaft 20. Therefore, the arm 35 has a function of transmitting the rotational force of the drive shaft 20 to the digging wing 31 when the drive shaft 20 is rotated. In addition to this, the arm 35 also has a function of stirring the excavated soil at the time of excavating by the excavating and stirring device 30.

ここで、図5に示す掘削攪拌装置30の上面図において、アーム35は、対応する羽根33の本体部33aに重畳される。同時に、アーム35は、対応する羽根33の前記傾斜部33bのうち、少なくとも前記掘削翼31の回転方向の先端側で且つ前記径方向の先端部分を露呈している。   Here, in the top view of the drilling and stirring apparatus 30 shown in FIG. 5, the arm 35 is superimposed on the main body 33 a of the corresponding blade 33. At the same time, the arm 35 exposes at least the tip end side in the rotational direction of the digging wing 31 and the tip portion in the radial direction among the inclined portions 33 b of the corresponding vanes 33.

連結部36は、3枚の羽根33と、これら羽根33の上方に各々位置するアーム35とを連結する。上述したように、嵌入部34は、駆動軸20の外軸22の嵌入部22aに嵌め込まれる。したがって、駆動軸20の外軸22の回転力は、アーム35及び連結部36を介して3枚の羽根33に伝達される。   The connecting portion 36 connects the three blades 33 and the arms 35 respectively located above the blades 33. As described above, the insertion portion 34 is inserted into the insertion portion 22 a of the outer shaft 22 of the drive shaft 20. Therefore, the rotational force of the outer shaft 22 of the drive shaft 20 is transmitted to the three blades 33 via the arm 35 and the connecting portion 36.

連結部36は、掘削翼31の回転方向における先端側に先細り形状(刃先形状)の取込部36aを有する。取込部36aは、掘削翼31の回転により掘削された掘削土を、掘削翼31の回転軌跡における外周部分から回転中心側に、言い換えれば、後述する上部攪拌翼41及び下部攪拌翼42に向けて取り込むために設けられる。図5に示す掘削攪拌装置30の上面図において、取込部36aは、アーム35から先端部分が露呈している。詳細には、取込部36aは、アーム35から露呈される前記傾斜部33bの少なくとも掘削翼31の回転方向の先端側で且つ径方向の先端部分に向けて突出するように配設される。なお、取込部36aが示す先細り形状としては、取込部36aの側面36bが掘削翼31の回転方向における先端部が後端部よりも掘削翼31の回転中心側に傾いた面又は掘削翼31の回転軌跡における法線方向に平行な平面である。一方、取込部36aの側面36cは、側面36bに鋭角に交差する平面である。言い換えれば、取込部36aの側面36cは、掘削翼31の上面視において、掘削翼31の回転方向における先端側が後端側よりも掘削翼31の回転軌跡の外周側に位置するように傾いた平面である。   The connection portion 36 has a tapered (edge-shaped) intake portion 36 a on the tip end side in the rotational direction of the digging wing 31. The take-in portion 36 a directs the excavated soil excavated by the rotation of the excavating wing 31 from the outer peripheral portion to the rotation center side in the rotation trajectory of the excavating wing 31, in other words, the upper stirring wing 41 and the lower stirring wing 42 described later Are provided for capturing. In the top view of the drilling and stirring apparatus 30 shown in FIG. 5, the leading end portion of the taking-in portion 36 a is exposed from the arm 35. In detail, the taking-in portion 36 a is disposed so as to project toward the tip portion in the radial direction at least the tip end side of the inclined portion 33 b exposed from the arm 35 in the rotational direction of the digging wing 31. In addition, as the tapered shape shown by the intake portion 36a, the side or surface of the intake portion 36a is a surface or the excavated wing in which the tip end in the rotation direction of the excavating wing 31 is inclined to the rotation center side of the excavating wing 31 than the rear end. It is a plane parallel to the normal direction in the 31 rotation trajectories. On the other hand, the side surface 36c of the taking-in portion 36a is a plane intersecting the side surface 36b at an acute angle. In other words, the side surface 36c of the take-in portion 36a is inclined such that the tip end side in the rotation direction of the digging wing 31 is positioned on the outer peripheral side of the rotation trajectory of the digging wing 31 than the rear end side It is a plane.

連結部36は、上下方向における中央部分に、掘削翼31の回転中心に向けて、水平方向に延びる外側攪拌翼38を備える。外側攪拌翼38は、掘削翼31の回転により掘削される掘削土と薬液とを攪拌混合する際に、掘削土の共回り現象を防止する共回り防止翼として機能する部材である。外側攪拌翼38は、上面及び底面が水平面となるように、また、後述する回転軸40の近傍まで延出される(図4参照)。ここで、回転軸方向における外側攪拌翼38の位置は、後述する上部攪拌翼41と下部攪拌翼42との間の隙間に挿入される位置である。なお、外側攪拌翼38は、一例として、掘削翼31の回転中心から径方向に209mm〜880mmの範囲に設けられる。なお、連結部36は、柱状の部材であってもよいし、筒状の部材であってもよい。   The connection portion 36 includes an outer stirring blade 38 extending in the horizontal direction toward the center of rotation of the cutting blade 31 at a central portion in the vertical direction. The outer stirring blade 38 is a member that functions as a corotation preventing blade that prevents the co-rotation phenomenon of the excavated soil when the excavated soil excavated by the rotation of the excavating wing 31 and the chemical solution are stirred and mixed. The outer stirring blade 38 is extended so that the upper surface and the bottom surface are horizontal and near the rotation shaft 40 described later (see FIG. 4). Here, the position of the outer stirring blade 38 in the rotational axis direction is a position where it is inserted into the gap between the upper stirring blade 41 and the lower stirring blade 42 described later. In addition, the outer stirring blade 38 is provided, for example, in the range of 209 mm to 880 mm in the radial direction from the rotation center of the digging blade 31. The connecting portion 36 may be a columnar member or a cylindrical member.

上述したように、円筒部32は、駆動軸20の内軸21が接続される回転軸40を軸支する。回転軸40は、軸方向に所定間隔を空けた2つの位置に、3枚の攪拌翼41,42を備える。以下、攪拌翼41,42のうち、回転軸40の上部に配設される攪拌翼41を上部攪拌翼41と称し、回転軸40の下部に配設される攪拌翼42を下部攪拌翼42と称する。   As described above, the cylindrical portion 32 pivotally supports the rotation shaft 40 to which the inner shaft 21 of the drive shaft 20 is connected. The rotating shaft 40 is provided with three stirring blades 41 and 42 at two positions spaced by a predetermined distance in the axial direction. Hereinafter, among the stirring blades 41 and 42, the stirring blade 41 disposed on the upper portion of the rotating shaft 40 is referred to as the upper stirring blade 41, and the stirring blade 42 disposed on the lower portion of the rotating shaft 40 is referred to as the lower stirring blade 42. It is called.

上部攪拌翼41及び下部攪拌翼42は、各々120°間隔を空けて回転軸の外周面に配設される。下部攪拌翼42は、上部攪拌翼41に対して回転軸40の円周方向に60°ずらして配設される。なお、上部攪拌翼41及び下部攪拌翼42は、回転方向における先端側が後端側よりも下り傾斜した状態で回転軸40に配設される。上部攪拌翼41及び下部攪拌翼42の回転軌跡における直径は、一例として1580mmである。   The upper stirring blade 41 and the lower stirring blade 42 are disposed on the outer peripheral surface of the rotation shaft at intervals of 120 °. The lower stirring blade 42 is disposed so as to be shifted by 60 ° in the circumferential direction of the rotation shaft 40 with respect to the upper stirring blade 41. The upper stirring blade 41 and the lower stirring blade 42 are disposed on the rotating shaft 40 in a state where the front end side in the rotational direction is inclined downward than the rear end side. The diameter of the rotational trajectory of the upper stirring blade 41 and the lower stirring blade 42 is, for example, 1580 mm.

図4及び図7に示すように、下部攪拌翼42の下方には、薬液が吐出される吐出部45が設けられる。本実施形態では、吐出部45は、下部攪拌翼42に配置しているが、下部攪拌翼4と一体としてもよい。吐出部45は、下部攪拌翼42の延出方向に向けて薬液を吐出する吐出ノズル46の他、下部攪拌翼42の回転方向の後方に向けて薬液を吐出する複数の吐出ノズル47を有する。ここで、下部攪拌翼42の回転方向の後方に向けて薬液を吐出する複数の吐出ノズル47は、下部攪拌翼42の延出方向に、一定間隔を空けて複数設けられる。なお、符号48は、回転軸40の軸部56に設けられた通路58と連通する送出管である。   As shown in FIGS. 4 and 7, below the lower stirring blade 42, a discharge unit 45 from which the chemical solution is discharged is provided. In the present embodiment, the discharge portion 45 is disposed on the lower stirring blade 42, but may be integrated with the lower stirring blade 4. The discharge unit 45 has a plurality of discharge nozzles 47 for discharging the chemical solution rearward of the rotation direction of the lower stirring blade 42, in addition to the discharge nozzle 46 for discharging the chemical solution in the extension direction of the lower stirring blade 42. Here, a plurality of discharge nozzles 47 that discharge the chemical solution toward the rear in the rotational direction of the lower stirring blade 42 are provided in the extending direction of the lower stirring blade 42 at a constant interval. Reference numeral 48 denotes a delivery pipe communicating with the passage 58 provided on the shaft portion 56 of the rotating shaft 40.

図8に示すように、回転軸40は、複数の部材から構成される。回転軸40は、内管51aと外管51bとを有する、所謂二重管構造の送出管51を内部に備える。回転軸40は、駆動軸20の内軸21が接続される略円筒状の接続部55と、掘削翼31が有する円筒部32に軸支される軸部56とを有する。接続部55は、送出管51の内管51aが挿通される挿通孔55aを有する。接続部55の下端側には、送出管51の外管51bが装着される保持部材57が嵌入される。符号57aは、保持部材57が有する挿通孔である。軸部56は、送出管51の内管51aの下端部が嵌入される孔56aを有する。軸部56の上端部は、送出管51の外管51bの下端部が嵌入される。送出管51の外管51bの下端部が嵌入される箇所と、送出管51の内管51aの下端部が嵌入される孔56aの間には、所定の空間56bが設けらる。この空間から軸部56の外周面に向けて、3本の通路58が形成される。なお、図8においては、3本の通路58のうち、1本の通路のみを表している。これら通路は、吐出部45に向けて薬液を送り出す送出通路となる。   As shown in FIG. 8, the rotation shaft 40 is composed of a plurality of members. The rotating shaft 40 internally includes a so-called double pipe delivery pipe 51 having an inner pipe 51a and an outer pipe 51b. The rotating shaft 40 has a substantially cylindrical connecting portion 55 to which the inner shaft 21 of the drive shaft 20 is connected, and a shaft portion 56 pivotally supported by the cylindrical portion 32 of the digging wing 31. The connection portion 55 has an insertion hole 55 a through which the inner pipe 51 a of the delivery pipe 51 is inserted. At the lower end side of the connection portion 55, a holding member 57 to which the outer pipe 51b of the delivery pipe 51 is attached is fitted. The code | symbol 57a is the penetration hole which the holding member 57 has. The shaft portion 56 has a hole 56 a into which the lower end portion of the inner pipe 51 a of the delivery pipe 51 is inserted. The lower end portion of the outer pipe 51 b of the delivery pipe 51 is inserted into the upper end portion of the shaft portion 56. A predetermined space 56b is provided between the portion where the lower end portion of the outer pipe 51b of the delivery pipe 51 is fitted and the hole 56a where the lower end portion of the inner pipe 51a of the delivery pipe 51 is fitted. Three passages 58 are formed from this space toward the outer peripheral surface of the shaft 56. In FIG. 8, only one of the three passages 58 is shown. These passages serve as delivery passages for delivering the chemical solution toward the discharge unit 45.

回転軸40において、接続部55が有する挿通孔55aと内管51aとが形成する空間、保持部材57が有する挿通孔57aと内管51aとが形成する空間、内管51a及び外管51bとが形成する空間及び軸部56の空間56bが、送り込まれる薬液の薬液通路(第1薬液通路)として機能する。一方、内管51aは、後述する穿孔ビット60に向けて送り込む薬液の薬液通路(第2薬液通路)として機能する。   In the rotation shaft 40, a space formed by the insertion hole 55a of the connection portion 55 and the inner pipe 51a, a space formed by the insertion hole 57a of the holding member 57 and the inner pipe 51a, the inner pipe 51a and the outer pipe 51b The space to be formed and the space 56b of the shaft portion 56 function as a chemical solution passage (first chemical solution passage) of the chemical solution to be fed. On the other hand, the inner pipe 51a functions as a chemical solution passage (second chemical solution passage) of the chemical solution to be sent toward the drilling bit 60 described later.

回転軸40の下端部で円筒部32の下方には、穿孔ビット60が配設される。穿孔ビット60は、掘削攪拌装置30における掘削時に地盤を掘進するものである。穿孔ビット60は、先端に4つの爪刃(切削チップ)61を有する。これら爪刃61は、一例として略円錐形状である。なお、穿孔ビット60の形状や穿孔ビット60に設けられる爪刃61の形状や個数は、適宜設計可能である。穿孔ビット60の外周面には、上述した第2薬液通路からの薬液を吐出する吐出口62が2箇所に設けられる。吐出口62は、180°間隔で設けられる。吐出口62の前面には、遮蔽蓋63が設けられる。遮蔽蓋63は、吐出口62を遮蔽する位置(図8中実線)に保持される。薬液を吐出するときには、送り込まれる薬液の押圧を受けて遮蔽蓋63が図8中点線の位置まで回動し、吐出口62を一部開放する。そして、薬液の吐出を停止すると、送り込まれる薬液の送り込みが停止されることを受けて、遮蔽蓋63が吐出口62を遮蔽する位置に復帰する。   A drilling bit 60 is disposed below the cylindrical portion 32 at the lower end of the rotating shaft 40. The drilling bit 60 is for digging the ground at the time of drilling in the drilling and stirring apparatus 30. The drilling bit 60 has four claw blades (cutting tips) 61 at its tip. These claw blades 61 have a substantially conical shape as an example. The shape of the drilling bit 60 and the shape and number of the claws 61 provided on the drilling bit 60 can be appropriately designed. The discharge port 62 which discharges the chemical | medical solution from the 2nd chemical | medical solution channel mentioned above is provided in the outer peripheral surface of the drilling bit 60 at two places. The discharge ports 62 are provided at an interval of 180 °. A shielding lid 63 is provided on the front surface of the discharge port 62. The shielding lid 63 is held at a position (solid line in FIG. 8) which shields the discharge port 62. When the chemical solution is discharged, the shielding lid 63 is pivoted to the position of the dotted line in FIG. 8 in response to the pressure of the supplied chemical solution, and the discharge port 62 is partially opened. Then, when the discharge of the chemical solution is stopped, in response to the stop of the feeding of the chemical solution to be sent, the shielding lid 63 returns to the position where the discharge port 62 is shielded.

以下、本実施形態の掘削攪拌装置30を用いて、地盤改良を施工する処理について説明する。地盤改良施工機10を地盤改良を行う箇所に移動させ、地盤改良施工機10に下端部に掘削攪拌装置30を装着した駆動軸20を回転駆動部14に装着する。そして、回転駆動部を介して、駆動軸20の内軸21を図9中F方向に、駆動軸20の外軸22を図9中G方向に回転させる。その後、昇降台13をリーダー12に沿って下降させる。図9(a)に示すように、昇降台13の下降により、駆動軸20の下端部に装着された掘削攪拌装置30が地盤表面に向けて図9中H方向に移動(下降)する。   Hereinafter, the process which implements ground improvement using the excavation stirring apparatus 30 of this embodiment is demonstrated. The ground improvement construction machine 10 is moved to a position where ground improvement is to be performed, and the drive shaft 20 having the excavating and stirring device 30 mounted on the lower end portion of the ground improvement construction machine 10 is mounted on the rotation drive unit 14. Then, the inner shaft 21 of the drive shaft 20 is rotated in the F direction in FIG. 9 and the outer shaft 22 of the drive shaft 20 is rotated in the G direction in FIG. Thereafter, the elevator 13 is lowered along the reader 12. As shown in FIG. 9A, when the elevator 13 is lowered, the digging and stirring device 30 mounted on the lower end of the drive shaft 20 moves (drops) in the H direction in FIG. 9 toward the ground surface.

掘削攪拌装置30が地盤表面に向けて下降すると、穿孔ビット60が地盤表面に接地する。ここで、駆動軸20の内軸21が図9中F方向に回転している。つまり、内軸21の下端部に接続された回転軸の下端部に装着された穿孔ビット60も図9中F方向に回転している。したがって、図9(b)に示すように、掘削攪拌装置30を下降させると、図9中F方向に回転する穿孔ビット60により地盤を穿孔する。このとき、地盤改良施工機10とは別に施工箇所に設置されたポンプにより薬液の供給が行われる。この薬液は、穿孔ビット60の外周面に設けられた吐出口62から地盤内部に吐出される。   When the drilling and stirring device 30 descends toward the ground surface, the drilling bit 60 contacts the ground surface. Here, the inner shaft 21 of the drive shaft 20 is rotating in the F direction in FIG. That is, the drill bit 60 mounted on the lower end of the rotary shaft connected to the lower end of the inner shaft 21 also rotates in the F direction in FIG. Therefore, as shown in FIG. 9 (b), when the drilling and stirring device 30 is lowered, the ground is drilled by the drilling bit 60 rotating in the F direction in FIG. At this time, supply of a chemical | medical solution is performed by the pump installed in the construction location separately from the ground improvement construction machine 10. As shown in FIG. The chemical solution is discharged from the discharge port 62 provided on the outer peripheral surface of the drilling bit 60 into the ground.

引き続き、掘削攪拌装置30が下降されると、掘削翼31が有する3枚の羽根33により地盤が掘削される。このとき、掘削翼31の回転方向は、図9中G方向である。掘削翼31により掘削された掘削土は、3枚の羽根33の各々に乗り上げる。同時に、掘削翼31の各羽根33とアーム35とを連結する連結部36が有する取込部36aが、掘削翼31の回転軌跡における外縁部分に位置する掘削土を羽根33とアーム35と間の空間に取り込む。   Subsequently, when the drilling and stirring device 30 is lowered, the ground is excavated by the three blades 33 of the drilling blade 31. At this time, the rotational direction of the digging wing 31 is the G direction in FIG. The excavated soil excavated by the excavating wing 31 rides on each of the three vanes 33. At the same time, the taking-in portion 36 a of the connecting portion 36 for connecting the blades 33 of the digging wing 31 to the arm 35 has the excavated soil located at the outer edge portion in the rotation trajectory of the digging wing 31 between the blades 33 and the arm 35 Capture in space.

駆動軸20の軸方向において、羽根33とアーム35との間の空間には、上部攪拌翼41と下部攪拌翼42とが設けられる。これら攪拌翼41,42は、回転軸40が駆動軸20の内軸21に接続されることから、図9中F方向に回転している。したがって、薬液が供給された掘削土が上部攪拌翼41と下部攪拌翼42とによって攪拌される。このとき、下部攪拌翼42の下方に設けられた吐出部45の吐出ノズル46,47から、薬液が吐出されている。この際、吐出ノズル46は、掘削翼31による回転軌跡の外周縁部に向けて薬液を吐出(供給)し、吐出ノズル47は、掘削翼31による回転軌跡の径方向に薬液を吐出している。したがって、羽根33とアーム35と間の空間に取り込まれた掘削土に対して均一に薬液を供給することができる。   An upper stirring blade 41 and a lower stirring blade 42 are provided in a space between the blade 33 and the arm 35 in the axial direction of the drive shaft 20. Since the rotary shaft 40 is connected to the inner shaft 21 of the drive shaft 20, the stirring blades 41 and 42 rotate in the F direction in FIG. Accordingly, the excavated soil supplied with the chemical solution is agitated by the upper agitation blade 41 and the lower agitation blade 42. At this time, the chemical solution is discharged from the discharge nozzles 46 and 47 of the discharge unit 45 provided below the lower stirring blade 42. Under the present circumstances, the discharge nozzle 46 discharges (supplys) a chemical | medical solution toward the outer peripheral part of the rotation locus | trajectory by the excavation blade 31, and the discharge nozzle 47 is discharging the chemical | medical solution in the radial direction of the rotation locus | trajectory . Therefore, the chemical solution can be uniformly supplied to the excavated soil taken into the space between the blade 33 and the arm 35.

上部攪拌翼41及び下部攪拌翼42の回転方向に対して、掘削翼31とともに回転する外側攪拌翼38の回転方向は、逆方向である。したがって、上部攪拌翼41及び下部攪拌翼42の回転により掘削土の攪拌の他に、上部攪拌翼41及び下部攪拌翼42の回転とは逆方向に回転する外側攪拌翼38による薬液と掘削土との強制的な混合が付加される。その結果、従来の地盤改良方法で発生しやすい掘削土の共回り現象を防止でき、また、土壌の種類の如何に拘わらず、供給される薬液と掘削土とを略完全な状態にまで攪拌混合することが可能となる。さらに、薬液が攪拌混合された掘削土は、図8中G方向に回転するアーム35や、駆動軸20の外軸22に設けた攪拌翼25により、さらなる掘削土及び薬液の攪拌混合が実行される。   With respect to the rotational direction of the upper stirring blade 41 and the lower stirring blade 42, the rotation direction of the outer stirring blade 38 that rotates with the digging blade 31 is reverse. Therefore, in addition to the agitation of the excavated soil by the rotation of the upper agitation blade 41 and the lower agitation blade 42, the chemical solution and the excavated soil by the outer agitation blade 38 that rotates in the opposite direction to the rotation of the upper agitation blade 41 and the lower agitation blade 42 Forced mixing of is added. As a result, it is possible to prevent the co-rotation phenomenon of the excavated soil which is likely to occur by the conventional ground improvement method, and also to stir and mix the supplied chemical solution and excavated soil to a nearly perfect state regardless of the type of soil. It is possible to Further, the excavated soil in which the chemical solution is agitated and mixed is further subjected to agitation and mixing of the excavated soil and the chemical solution by the arm 35 rotating in the G direction in FIG. 8 and the agitating blades 25 provided on the outer shaft 22 of the drive shaft 20. Ru.

そして、図9(c)に示すように所望の深さまで掘削し、同時に薬液と掘削土とを攪拌混合する。その後、図9(d)及び図9(e)に示すように、昇降台13を上昇させる。これにより、駆動軸20の下端部に装着された掘削攪拌装置30が地盤表面に向けて図9中I方向に移動(上昇)する。   And as shown in FIG.9 (c), it digs to a desired depth, and stirs and mixes a chemical | medical solution and excavated soil simultaneously. Thereafter, as shown in FIGS. 9 (d) and 9 (e), the elevator 13 is raised. Thereby, the digging and stirring apparatus 30 mounted on the lower end portion of the drive shaft 20 moves (rises) in the I direction in FIG. 9 toward the ground surface.

掘削翼31の上方には、上方に突出する山形状のアーム35を有していることから、薬液と攪拌混合された掘削土は、アーム35の上面の形状に沿って移動する。したがって、掘削攪拌装置30を引き抜く際の抵抗を抑制することができる。なお、この際にも、掘削翼31及び外側攪拌翼38が図9中G方向に、上部攪拌翼41及び下部攪拌翼42が図9中F方向に回転しているので、掘削攪拌装置30を引き抜いている過程においても、薬液が供給された掘削土は攪拌混合される。その結果、従来の地盤改良方法では、中心部分の強度が高く、外周縁部に向けて強度が弱くなる円柱状のセメントコラムが形成されやすいが、本実施形態の掘削攪拌装置30においては、供給される薬液と掘削土とを略完全な状態にまで混合攪拌することが可能となるので、均一な強度となる円柱状のセメントコラムを地盤中に形成することが可能となる。   Since the mountain-shaped arm 35 protruding upward is provided above the digging wing 31, the excavated soil mixed with the chemical solution moves along the shape of the upper surface of the arm 35. Therefore, the resistance at the time of pulling out the drilling and stirring device 30 can be suppressed. Also in this case, since the digging blades 31 and the outer stirring blades 38 rotate in the G direction in FIG. 9 and the upper stirring blades 41 and the lower stirring blades 42 rotate in the F direction in FIG. In the process of withdrawal, the excavated soil supplied with the chemical solution is also stirred and mixed. As a result, in the conventional ground improvement method, a columnar cement column having high strength in the central portion and weak in strength toward the outer peripheral portion is likely to be formed. Since it is possible to mix and stir the chemical solution and the excavated soil to a substantially complete state, it is possible to form a cylindrical cement column with uniform strength in the ground.

本実施形態では、掘削翼31に設けた連結部36に外側攪拌翼38を設けることで、掘削翼31と、外側攪拌翼38とを個別に設ける必要がない。また、掘削翼31とアーム35との間の空間に上部攪拌翼41及び下部攪拌翼42を配置することで、掘削攪拌装置30をコンパクトにすることができる。   In the present embodiment, by providing the outer stirring wing 38 in the connection portion 36 provided on the drilling wing 31, there is no need to separately provide the drilling wing 31 and the outer stirring wing 38. In addition, by arranging the upper stirring blade 41 and the lower stirring blade 42 in the space between the drilling blade 31 and the arm 35, the drilling and stirring device 30 can be made compact.

本実施形態では、駆動軸20の外軸22に設けられる3枚の攪拌翼25の位置を、駆動軸20の軸方向において同一の位置としているが、駆動軸20の軸方向に所定の長さずらして配置することも可能である。   In the present embodiment, the positions of the three stirring blades 25 provided on the outer shaft 22 of the drive shaft 20 are the same in the axial direction of the drive shaft 20, but a predetermined length in the axial direction of the drive shaft 20 It is also possible to shift and arrange.

また、3枚の攪拌翼25を設ける位置を、駆動軸20の軸方向における複数の位置とし、各位置に3枚の攪拌翼を設けることも可能である。複数の位置に3枚の攪拌翼25を配置する場合、複数の位置の各々に1枚の攪拌翼を設け、これら攪拌翼を基準として、残りの2枚の攪拌翼を駆動軸20の軸方向に所定の長さずらして配置することも可能である。   Further, it is also possible to set positions where the three stirring blades 25 are provided as a plurality of positions in the axial direction of the drive shaft 20 and provide three stirring blades at each position. When three stirring blades 25 are arranged at a plurality of positions, one stirring blade is provided at each of the plurality of positions, and the remaining two stirring blades are arranged in the axial direction of the drive shaft 20 with reference to these stirring blades. It is also possible to arrange them at a predetermined length.

本実施形態では、駆動軸20の外軸22に攪拌翼25を設けた場合を一例として説明しているが、本実施形態に示す掘削攪拌装置30により掘削土と薬液とを均一に混合できるのであれば、駆動軸20の外軸22に、3枚の攪拌翼25を配設する必要はない。   In the present embodiment, although the case where the stirring blade 25 is provided on the outer shaft 22 of the drive shaft 20 is described as an example, the excavated soil and the chemical solution can be uniformly mixed by the excavating and stirring apparatus 30 described in the present embodiment. If it is, it is not necessary to dispose three stirring blades 25 on the outer shaft 22 of the drive shaft 20.

本実施形態では、1つの掘削攪拌装置30を用いて地盤改良を行う場合について説明しているが、掘削攪拌装置30を複数並置して使用することも可能である。   In this embodiment, although the case where ground improvement is performed using one drilling and stirring device 30 is described, it is also possible to use a plurality of drilling and stirring devices 30 in parallel.

本実施形態では、回転軸40の軸方向の異なる2つの位置に攪拌翼41,42を設けた場合について説明しているが、回転軸40の軸方向の異なる3つ以上の位置に攪拌翼を設けることも可能である。この場合、連結部36に設ける外側攪拌翼38は、回転軸40の軸方向(若しくは、掘削翼31の回転軸方向)において、隣り合う攪拌翼間に各々設けることが望ましい。   In this embodiment, the stirring blades 41 and 42 are provided at two different positions in the axial direction of the rotating shaft 40. However, the stirring blades are disposed at three or more different positions in the axial direction of the rotating shaft 40. It is also possible to provide. In this case, it is desirable that the outer stirring blades 38 provided in the connection portion 36 be provided between the adjacent stirring blades in the axial direction of the rotation shaft 40 (or in the rotation shaft direction of the digging blades 31).

本実施形態では、掘削攪拌装置30と、攪拌翼25が配設されるとともに、下端部に該掘削攪拌装置30が装着される駆動軸20とを別体としているが、駆動軸を備えた掘削攪拌装置としてもよい。   In the present embodiment, the drilling and stirring apparatus 30 and the stirring vanes 25 are disposed, and the drive shaft 20 to which the drilling and stirring apparatus 30 is attached at the lower end is separately provided. It may be a stirrer.

本実施形態では、アーム35が配設される嵌入部34を駆動軸20の外軸22に嵌入させることで、駆動軸20の外軸22が回転したときの回転力を、アーム35及び連結部36を介して掘削翼31に伝達している。同時に、上部攪拌翼41及び下部攪拌翼42を有する回転軸40に駆動軸20の内軸21を接続することで、駆動軸20の内軸21が回転した時の回転力を回転軸40に伝達している。掘削攪拌装置30としては、例えば駆動軸20の外軸22を回転軸40に接続固定し、駆動軸20の内軸21を掘削翼31に接続固定することも可能である。この場合、駆動軸20の内軸21と外軸22との隙間に下部攪拌翼42の下部に設けた吐出部45及び穿孔ビット60の外周面に設けた吐出口62の各々に、薬液を送出する通路を設ける必要がある。   In the present embodiment, by inserting the fitting portion 34 in which the arm 35 is disposed on the outer shaft 22 of the drive shaft 20, the rotational force when the outer shaft 22 of the drive shaft 20 rotates can be taken as the arm 35 and the connecting portion. It is transmitted to the drilling blade 31 via 36. At the same time, by connecting the inner shaft 21 of the drive shaft 20 to the rotary shaft 40 having the upper stirring blade 41 and the lower stirring blade 42, the rotational force when the inner shaft 21 of the drive shaft 20 rotates is transmitted to the rotary shaft 40 doing. It is also possible to connect and fix the outer shaft 22 of the drive shaft 20 to the rotary shaft 40 and connect and fix the inner shaft 21 of the drive shaft 20 to the digging wing 31, for example. In this case, the chemical solution is delivered to the discharge portion 45 provided in the lower part of the lower stirring blade 42 in the gap between the inner shaft 21 and the outer shaft 22 of the drive shaft 20 and the discharge port 62 provided on the outer peripheral surface of the drilling bit 60 It is necessary to provide a path to

なお、駆動軸20の外軸22を回転軸40に接続固定し、駆動軸20の内軸21を掘削翼31に接続固定する場合には、アーム35の構成は必ずしも必要ではないが、掘削攪拌装置を地盤から引き抜く際に、薬液が供給された掘削土における抵抗を掘削攪拌装置が受けることから、アーム35を設けることが望ましい。   In the case where the outer shaft 22 of the drive shaft 20 is connected and fixed to the rotary shaft 40 and the inner shaft 21 of the drive shaft 20 is connected and fixed to the digging wing 31, the configuration of the arm 35 is not always necessary, but It is desirable to provide an arm 35 because the digging and stirring apparatus receives resistance in the excavated soil supplied with the chemical solution when the apparatus is withdrawn from the ground.

本実施形態では、穿孔ビット60に設けた吐出口62と、下部攪拌翼42の下部に設けた吐出部45との双方から薬液を吐出する場合について説明しているが、吐出口62又は吐出部45のいずれか一方から薬液を吐出するようにしてもよい。さらには、これら吐出口62及び吐出部45を有していない掘削攪拌装置であってもよい。   In the present embodiment, although the case where the chemical solution is discharged from both the discharge port 62 provided in the drilling bit 60 and the discharge part 45 provided in the lower part of the lower stirring blade 42 is described, the discharge port 62 or the discharge part The chemical solution may be discharged from any one of 45. Furthermore, it may be a digging and stirring apparatus which does not have the discharge port 62 and the discharge part 45.

本実施形態では、吐出部45に設けた吐出ノズル46,47の双方から薬液を吐出する形態としているが、吐出ノズル46,47のいずれか一方から薬液を吐出できる形態であってもよい。   In the present embodiment, the chemical solution is discharged from both of the discharge nozzles 46 and 47 provided in the discharge unit 45, but the liquid chemical may be discharged from any one of the discharge nozzles 46 and 47.

10…地盤改良施工機、20…駆動軸、21…内軸、22…外軸、25…攪拌翼、30…掘削攪拌装置、31…掘削翼、33…羽根、34…嵌入部、35…アーム、36…連結部、36a…取込部、37…掘削刃、38…外側攪拌翼、41…上部攪拌翼、42…下部攪拌翼、45…吐出部、60…穿孔ビット、62…吐出口、63…遮蔽蓋
DESCRIPTION OF SYMBOLS 10 ... Ground improvement construction machine, 20 ... Drive shaft, 21 ... Inner shaft, 22 ... Outer shaft, 25 ... Stirring blade, 30 ... Excitation stirring device, 31 ... Drilling blade, 33 ... Feather, 34 ... Insertion part, 35 ... Arm , 36: connecting portion, 36a: taking-in portion, 37: digging blade, 38: outer stirring blade, 41: upper stirring blade, 42: lower stirring blade, 45: discharging portion, 60: piercing bit, 62: discharging port, 63 ... Shielding lid

Claims (8)

回転中心に対して径方向に延出される複数の羽根を有する掘削翼と、
前記掘削翼が有する前記複数の羽根の上方に各々配置され、前記回転中心から径方向に延出される複数のアームと、
前記複数のアームと前記掘削翼との間で、前記掘削翼の回転軸方向の複数の位置に配置され、前記掘削翼とは逆方向に回転する第1の攪拌翼と、
前記掘削翼の回転により掘削された土壌を前記第1の攪拌翼に向けて取り込む、前記掘削翼の回転方向の先端側に向けて先細りする形状の取込部を有し、前記複数のアームの各アームの先端部と前記掘削翼が有する各羽根の先端部とを連結する連結部材と、
前記連結部材に設けられ、前記第1の攪拌翼のうち、前記掘削翼の回転軸方向において隣り合う前記第1の攪拌翼の移動軌跡間に延出される共回り防止翼と、
を含むことを特徴とする掘削攪拌装置。
A drilling blade having a plurality of blades extending radially with respect to the rotation center;
A plurality of arms respectively disposed above the plurality of blades of the digging wing and radially extending from the rotation center;
A first stirring blade disposed between the plurality of arms and the digging blade at a plurality of positions in the rotational axis direction of the digging blade and rotating in a direction opposite to the digging blade;
It has an intake portion having a shape tapered toward the tip end side in the rotational direction of the drilling blade, which takes in the soil excavated by the rotation of the drilling blade toward the first stirring blade; A connecting member for connecting the tip of each arm and the tip of each blade of the digging wing;
Among the first stirring blades, a co-rotation preventing blade which is provided on the connection member and extends between movement trajectories of the first stirring blades adjacent in the rotational axis direction of the digging blade;
An excavating and stirring apparatus characterized by including.
請求項1に記載の掘削攪拌装置において、
前記複数の羽根は、前記回転中心から径方向に水平に延出される本体部と、前記掘削翼の回転方向における前記本体部の先端側から下り傾斜する傾斜部を各々有し、
前記複数のアームの各アームは、装置の上面視において、対応する羽根の前記傾斜部のうち、少なくとも前記掘削翼の回転方向の先端側で且つ前記径方向の先端部分を露呈するように配設され、
前記取込部は、前記装置の上面視において前記アームから露呈される前記傾斜部の少なくとも前記掘削翼の回転方向の先端側で且つ前記径方向の先端部分に向けて突出する
ことを特徴とする掘削攪拌装置。
In the drilling and stirring apparatus according to claim 1,
Each of the plurality of blades has a main body extending horizontally in the radial direction from the rotation center, and an inclined portion which is inclined downward from the tip end of the main body in the rotational direction of the digging wing,
Each arm of the plurality of arms is disposed so as to expose at least the tip end side in the rotational direction of the digging blade and the radial tip portion of the inclined portion of the corresponding blade in a top view of the device And
The take-in portion protrudes toward the tip end portion in the rotational direction of at least the digging blade of the inclined portion exposed from the arm in a top view of the device and toward the tip portion in the radial direction. Drilling and stirring device.
請求項1又は請求項2に記載の掘削攪拌装置において、
前記第1の攪拌翼のうち、少なくとも前記掘削翼に近接した前記第1の攪拌翼に設けられ、前記第1の攪拌翼による前記土壌の攪拌時に、攪拌される前記土壌に混合する薬液を吐出する吐出部を有することを特徴とする掘削攪拌装置。
In the drilling and stirring apparatus according to claim 1 or 2,
Among the first stirring blades, provided on at least the first stirring blade close to the digging blade, discharging a chemical solution mixed with the soil to be stirred when the soil is stirred by the first stirring blade An excavating and stirring apparatus characterized by comprising:
請求項3に記載の掘削攪拌装置において、
前記吐出部は、前記回転中心に対して前記径方向に前記薬液を前記土壌に吐出することを特徴とする掘削攪拌装置。
In the drilling and stirring apparatus according to claim 3,
The said stirring part discharges the said chemical | medical solution to the said soil to the said radial direction with respect to the said rotation center, The excavation stirring apparatus characterized by the above-mentioned.
請求項3又は請求項4に記載の掘削攪拌装置において、
前記吐出部は、前記第1の攪拌翼の回転方向における後端側から前記薬液を前記土壌に吐出することを特徴とする掘削攪拌装置。
In the drilling and stirring apparatus according to claim 3 or 4,
The said discharge part discharges the said chemical | medical solution to the said soil from the rear end side in the rotation direction of a said 1st stirring blade, The excavation stirring apparatus characterized by the above-mentioned.
請求項1から請求項5のいずれか1項に記載の掘削攪拌装置において、
前記第1の攪拌翼が外周面に設けられた回転軸の一端部に固定され、前記回転軸の回転時に前記土壌に圧入する薬液を吐出する吐出口を外周面に備えた穿孔ビットを、有することを特徴とする掘削攪拌装置。
The drilling and stirring apparatus according to any one of claims 1 to 5,
The first stirring blade is fixed to one end of a rotating shaft provided on the outer peripheral surface, and has a drilling bit provided on the outer peripheral surface with a discharge port for discharging a chemical solution to be pressed into the soil when the rotating shaft rotates. Drilling and stirring device characterized by
請求項6に記載の掘削攪拌装置において、
前記薬液の注入時に、送り込まれる前記薬液の押圧を受けて前記吐出口を開放し、前記薬液の注入が停止されたことを受けて前記吐出口を遮蔽する遮蔽部材を有することを特徴とする掘削攪拌装置。
In the drilling and stirring apparatus according to claim 6,
At the time of injection of the chemical solution, the discharge port is opened upon receiving the pressure of the chemical solution to be fed, and a shielding member is provided which shields the discharge port upon stopping of the injection of the chemical solution. Stirring device.
請求項1から請求項7のいずれか1項に記載の掘削攪拌装置において、
前記複数のアームの回転中心側に位置する一端部を保持して、回転時の駆動力を前記複数のアームを介して前記掘削翼に伝達する駆動軸を有し、
前記駆動軸は、前記複数のアームの上方に、前記掘削翼と同一方向に回転する第2の攪拌翼をさらに備えることを特徴とする掘削攪拌装置。
The drilling and stirring apparatus according to any one of claims 1 to 7,
It has a drive shaft which holds an end portion located on the rotation center side of the plurality of arms and transmits a driving force at the time of rotation to the digging wing through the plurality of arms.
The digging and stirring apparatus according to claim 1, wherein the drive shaft further includes a second stirring blade rotating in the same direction as the drilling blade above the plurality of arms.
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CN115488144A (en) * 2022-09-23 2022-12-20 同济大学 In-situ repair device and equipment for double-pipe double-channel liquid adding, powder spraying and stirring

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JP2022186416A (en) * 2021-06-04 2022-12-15 株式会社Kgフローテクノ Construction method for hard ground hardening layer and apparatus of the same
CN115488144A (en) * 2022-09-23 2022-12-20 同济大学 In-situ repair device and equipment for double-pipe double-channel liquid adding, powder spraying and stirring

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