JP6837047B2 - Excavation agitator and ground improvement machine equipped with excavation agitator - Google Patents
Excavation agitator and ground improvement machine equipped with excavation agitator Download PDFInfo
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- 238000009412 basement excavation Methods 0.000 title claims description 157
- 230000002265 prevention Effects 0.000 claims description 162
- 239000002689 soil Substances 0.000 claims description 37
- 238000003756 stirring Methods 0.000 description 77
- 238000013019 agitation Methods 0.000 description 18
- 239000004568 cement Substances 0.000 description 14
- 239000008267 milk Substances 0.000 description 14
- 210000004080 milk Anatomy 0.000 description 14
- 235000013336 milk Nutrition 0.000 description 14
- 238000005553 drilling Methods 0.000 description 9
- 239000011521 glass Substances 0.000 description 7
- 239000004927 clay Substances 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 239000004575 stone Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
本発明は、地盤改良工法や連続止水壁工法等において、地盤中にコラム状の造成体を形成するのに用いられる掘削撹拌装置、及び掘削撹拌装置を備えた地盤改良機に関する。 The present invention relates to an excavation agitator used to form a column-shaped structure in the ground in a ground improvement method, a continuous water blocking wall method, etc., and a ground improvement machine provided with an excavation agitation device.
従来から、円柱状の造成体を形成する（即ち、地盤改良を行う）際に用いられる地盤改良機の掘削撹拌装置が知られている（特許文献１参照）。この掘削撹拌装置は、地盤改良機のオーガロッドの下端に配置される。 Conventionally, an excavation agitator of a ground improvement machine used for forming a columnar structure (that is, performing ground improvement) has been known (see Patent Document 1). This excavation agitator is located at the lower end of the auger rod of the ground improvement machine.
具体的に、掘削撹拌装置は、図１１にも示すように、オーガロッドの回転に伴って中心軸Ｃ５周りに回転する複数の回転翼（撹拌翼）５０１と、中心軸Ｃ５方向における複数の回転翼５０１と隣り合った位置に配置されてオーガロッドに対して回転自在に配置されると共に、掘削土の回転翼５０１との共回りを防止する複数の共回り防止翼５０２と、を備える。 Specifically, the drilling stirring device, as shown in FIG. 11, a plurality of rotating blades (stirring blade) 501 that rotates about axis C 5 around with the rotation of the auger rod, a plurality of central axis C 5 direction It is provided with a plurality of co-rotation prevention blades 502 which are arranged adjacent to the rotor 501 of the above and are rotatably arranged with respect to the auger rod and prevent co-rotation of the excavated soil with the rotor 501. ..
各回転翼５０１は、中心軸Ｃ５と直交する方向に真っ直ぐ延び且つ回転方向に間隔をあけて配置される。また、各共回り防止翼５０２も、中心軸Ｃ５と直交する方向に真っ直ぐ延び且つ回転方向に間隔をあけて配置される。これら各回転翼５０１と各共回り防止翼５０２との中心軸Ｃ５方向の間隔（詳しくは、回転翼５０１と共回り防止翼５０２とが互いに相対回転して中心軸Ｃ５方向から見て重なったときの中心軸Ｃ５方向の間隔）αは、それぞれ同じである。 Each rotor blade 501 is spaced straight extending and intervals in the rotational direction in the direction perpendicular to the center axis C 5. Each co-rotation prevention blades 502 are also spaced straight extending and intervals in the rotational direction in the direction perpendicular to the center axis C 5. The central axis C 5 direction of spacing of the respective rotor blade 501 and the co-rotation preventing wing 502 (particularly, overlapping when viewed from the central axis C 5 direction and the rotary blades 501 and the co-rotation preventing wing 502 to rotate relative to each other the central axis C 5 direction spacing) alpha when the, respectively the same.
以上のような掘削撹拌装置５００は、地盤改良の際（即ち、地盤を掘削して円柱状の造成体を形成する際）に、地中において中心軸Ｃ５を回転中心にして複数の回転翼５０１と複数の共回り防止翼５０２とが相対回転することで、地盤を柱状に掘削し又は掘削土とセメントミルクとの撹拌を行う。 Drilling stirring device 500, such as described above, when the soil improvement (i.e., during the formation of the by drilling ground cylindrical Construction body), a plurality of rotor blades in the rotation around the central axis C 5 in the ground The ground is excavated in a columnar shape or the excavated soil and cement milk are agitated by the relative rotation of the 501 and the plurality of co-rotation prevention blades 502.
以上のような掘削撹拌装置５００を用いた地盤改良の際に、掘削した柱状改良体の内部において、間隔α５より大きな粘土や石、ガラ等の塊が掘削土に混ざっていると、回転翼５０１と共回り防止翼５０２との相対回転時に、前記塊が回転翼５０１と共回り防止翼５０２との間に噛み込まれる場合がある。この場合、前記改良体から掘削撹拌装置５００を引き上げて前記塊を取り除かなければならず、作業効率が低下する。また、回転翼５０１と共回り防止翼５０２との間に噛み込が発生した場合、共回り防止翼５０２が回転翼５０１と一緒に回転してしまい、共回り防止翼５０２の本来の機能が妨げられる結果、共回り現象が発生して粘性土での混合撹拌がうまくできなくなる。 During the ground improvement using the excavation agitator 500 as described above, if lumps of clay, stone, glass, etc. with an interval of more than α 5 are mixed in the excavated soil inside the excavated columnar improved body, the rotor blades When the 501 and the co-rotation prevention blade 502 rotate relative to each other, the mass may be caught between the rotary blade 501 and the co-rotation prevention blade 502. In this case, the excavation stirring device 500 must be pulled up from the improved body to remove the lump, which lowers the work efficiency. Further, when biting occurs between the rotary blade 501 and the co-rotation prevention wing 502, the co-rotation prevention wing 502 rotates together with the rotary wing 501, and the original function of the co-rotation prevention wing 502 is hindered. As a result, a co-rotation phenomenon occurs and mixing and stirring with cohesive soil cannot be performed well.
そこで、本発明は、掘削土に混ざっている塊を回転翼と共回り防止翼との間に噛み込み難い掘削撹拌装置、及び該掘削撹拌装置を備えた地盤改良機を提供することを課題とする。 Therefore, an object of the present invention is to provide an excavation agitator in which it is difficult for a mass mixed in excavated soil to be caught between a rotary blade and a co-rotation prevention blade, and a ground improvement machine equipped with the excavation agitation device. To do.
本発明の掘削撹拌装置は、
長尺で且つ中心軸周りに回転可能なオーガロッドを備える地盤改良機の該オーガロッドの端部に配置されて地盤を掘削する掘削撹拌装置であって、
前記オーガロッドの回転に伴って前記中心軸周りに回転する複数の回転翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ回転方向に間隔をあけて配置される複数の回転翼と、
中心軸方向における前記複数の回転翼と隣り合った位置において前記オーガロッドに対して回転自在に配置されると共に掘削土の前記複数の回転翼との共回りを防止する複数の共回り防止翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ前記回転方向に間隔をあけて配置される複数の共回り防止翼と、を備え、
各回転翼における前記中心軸方向の前記共回り防止翼側の端縁の位置は、それぞれ同じであり、
前記複数の共回り防止翼のうちの一部の共回り防止翼である第一の共回り防止翼と前記各回転翼との前記中心軸方向の間隔は、前記複数の共回り防止翼のうちの残りの共回り防止翼である第二の共回り防止翼と前記各回転翼との前記中心軸方向の間隔より大きい。
The excavation agitator of the present invention
An excavation agitator that is placed at the end of an auger rod of a ground improvement machine equipped with an auger rod that is long and can rotate around the central axis to excavate the ground.
A plurality of rotor blades that rotate around the central axis with the rotation of the auger rod, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction. With wings
With a plurality of co-rotation prevention blades that are rotatably arranged with respect to the auger rod at a position adjacent to the plurality of rotor blades in the central axis direction and prevent co-rotation of the excavated soil with the plurality of rotor blades. A plurality of co-rotation prevention blades, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction, are provided.
The positions of the end edges on the co-rotation prevention blade side in the central axis direction of each rotor are the same.
The distance between the first co-rotation prevention blade, which is a part of the co-rotation prevention blades of the plurality of co-rotation prevention blades, and each of the rotary blades in the central axis direction is the distance between the co-rotation prevention blades. It is larger than the distance between the second co-rotation prevention blade, which is the remaining co-rotation prevention blade, and each rotor blade in the central axial direction.
かかる構成によれば、地盤の掘削等の際に共回り防止翼の回転が抑えられた状態でオーガロッドの回転に伴って回転翼が回転することで共回り防止翼と回転翼とが相対回転したときに、第一の共回り防止翼と各回転翼との間隔（第一間隔）が、第二の共回り防止翼と各回転翼との間隔（第二間隔）より大きいため、共回り防止翼と回転翼との間隔が全て第一間隔である掘削撹拌装置に比べ、掘削土に混ざっている塊（例えば、粘土や石、いわゆるガラ等の塊）を共回り防止翼と回転翼との間に噛み込み難くなる。 According to this configuration, the rotor blades rotate with the rotation of the auger rod in a state where the rotation of the rotor blades is suppressed during excavation of the ground, so that the rotor blades and the rotor blades rotate relative to each other. When this is done, the distance between the first co-rotation prevention blade and each rotor (first spacing) is larger than the distance between the second co-rotation prevention blade and each rotor (second spacing), so co-rotation Compared to the excavation agitator where the distance between the prevention blade and the rotor blade is all the first distance, the mass mixed in the excavated soil (for example, a mass such as clay or stone, so-called glass) is co-rotated with the rotor blade and the rotor blade. It becomes difficult to bite between.
回転翼と共回り防止翼との間隔が広すぎると、掘削土に混ざっている塊（粘性土塊等）を解す機能が低下するために、間隔を保持する補助機能として、前記掘削撹拌装置は、
前記回転翼及び前記共回り防止翼の一方の翼における他方の翼側の端縁から、前記回転翼及び前記共回り防止翼が相対回転したときに前記他方の翼と接触しない範囲で該他方の翼側に延出する延出板を備え、
前記延出板は、延出方向の先端側の部位が前記一方の翼の前記他方の翼に対する回転方向と反対側に変位するように弾性変形可能であることが好ましい。
If the distance between the rotary blade and the co-rotation prevention blade is too wide, the function of unraveling the lumps (cohesive soil lumps, etc.) mixed in the excavated soil deteriorates.
From the edge of one blade of the rotor blade and the co-rotation prevention blade on the other blade side, the other blade side does not come into contact with the other blade when the rotor blade and the co-rotation prevention blade rotate relative to each other. Equipped with an extension plate that extends to
It is preferable that the extension plate is elastically deformable so that the portion on the tip end side in the extension direction is displaced in the direction opposite to the rotation direction of the one blade with respect to the other blade.
このように延出板を設けることで相対回転する翼（回転翼、共回り防止翼）同士の中心軸方向の間隔を小さくし又は部分的に小さくすることで、掘削土の撹拌等の際に該掘削土等をより細かく破砕することができる。しかも、延出板が弾性変形可能であるため、他方の翼と延出板とが前記塊を噛み込みそうになっても、延出板が弾性変形することによって（図６参照）前記噛み込みを防ぐことができる。 By providing the extension plate in this way, the distance between the blades (rotor blades, co-rotation prevention blades) that rotate relative to each other in the central axis direction is reduced or partially reduced, so that when the excavated soil is agitated, etc. The excavated soil and the like can be crushed more finely. Moreover, since the extension plate is elastically deformable, even if the other wing and the extension plate are about to bite the mass, the extension plate is elastically deformed (see FIG. 6). Can be prevented.
また、本発明の地盤改良機は、
長尺で且つ中心軸周りに回転可能なオーガロッドと、
前記オーガロッドの端部に配置されて地盤を掘削する掘削撹拌装置と、を備え、
前記掘削撹拌装置は、
前記オーガロッドの回転に伴って前記中心軸周りに回転する複数の回転翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ回転方向に間隔をあけて配置される複数の回転翼と、
中心軸方向における前記複数の回転翼と隣り合った位置において前記オーガロッドに対して回転自在に配置されると共に掘削土の前記複数の回転翼との共回りを防止する複数の共回り防止翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ前記回転方向に間隔をあけて配置される複数の共回り防止翼と、を有し、
各回転翼における前記中心軸方向の前記共回り防止翼側の端縁の位置は、それぞれ同じであり、
前記複数の共回り防止翼のうちの一部の共回り防止翼である第一の共回り防止翼と前記各回転翼との前記中心軸方向の間隔は、前記複数の共回り防止翼のうちの残りの共回り防止翼である第二の共回り防止翼と前記各回転翼との前記中心軸方向の間隔より大きい。
Further, the ground improvement machine of the present invention is
An auger rod that is long and can rotate around the central axis,
An excavation agitator located at the end of the auger rod to excavate the ground is provided.
The excavation agitator
A plurality of rotor blades that rotate around the central axis with the rotation of the auger rod, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction. With wings
With a plurality of co-rotation prevention blades that are rotatably arranged with respect to the auger rod at a position adjacent to the plurality of rotor blades in the central axis direction and prevent co-rotation of the excavated soil with the plurality of rotor blades. Each has a plurality of co-rotation prevention blades that extend along a direction orthogonal to the central axis and are arranged at intervals in the rotation direction.
The positions of the end edges on the co-rotation prevention blade side in the central axis direction of each rotor are the same.
The distance between the first co-rotation prevention blade, which is a part of the co-rotation prevention blades of the plurality of co-rotation prevention blades, and each of the rotary blades in the central axis direction is the distance between the co-rotation prevention blades. It is larger than the distance between the second co-rotation prevention blade, which is the remaining co-rotation prevention blade, and each rotor blade in the central axial direction.
かかる構成によれば、地盤の掘削等の際に共回り防止翼の回転が抑えられた状態でオーガロッドの回転に伴って回転翼が回転することで共回り防止翼と回転翼とが相対回転したときに、第一の共回り防止翼と各回転翼との間隔（第一間隔）が、第二の共回り防止翼と各回転翼との間隔（第二間隔）より大きいため、共回り防止翼と回転翼との間隔が全て第一間隔である掘削撹拌装置に比べ、掘削土に混ざっている塊（例えば、粘土や石、いわゆるガラ等の塊）を共回り防止翼と回転翼との間に噛み込み難くなる。 According to this configuration, the rotor blades rotate with the rotation of the auger rod in a state where the rotation of the rotor blades is suppressed during excavation of the ground, so that the rotor blades and the rotor blades rotate relative to each other. When this is done, the distance between the first co-rotation prevention blade and each rotor (first spacing) is larger than the distance between the second co-rotation prevention blade and each rotor (second spacing), so co-rotation Compared to the excavation agitator where the distance between the prevention blade and the rotor blade is all the first distance, the mass mixed in the excavated soil (for example, a mass such as clay or stone, so-called glass) is co-rotated with the rotor blade and the rotor blade. It becomes difficult to bite between.
以上より、本発明によれば、掘削土に混ざっている塊を回転翼と共回り防止翼との間に噛み込み難い掘削撹拌装置、及び該掘削撹拌装置を備えた地盤改良機を提供することができる。 Based on the above, according to the present invention, there is provided an excavation agitator that makes it difficult for a mass mixed in excavated soil to be caught between a rotary blade and a co-rotation prevention blade, and a ground improvement machine equipped with the excavation agitation device. Can be done.
以下、本発明の一実施形態について、図１〜図６を参照しつつ説明する。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
本実施形態に係る掘削撹拌装置を備えた地盤改良機は、図１に示すように、略鉛直方向に立設されたリーダーマスト２１を有するベースマシン２と、地盤を掘削する掘削撹拌装置３を有し、且つリーダーマスト２１に配置される地盤改良駆動部４と、を備える。 As shown in FIG. 1, the ground improvement machine provided with the excavation agitation device according to the present embodiment includes a base machine 2 having a leader mast 21 erected in a substantially vertical direction and an excavation agitation device 3 for excavating the ground. It includes a ground improvement drive unit 4 that has and is arranged on the leader mast 21.
この地盤改良機１には、セメントミルクが貯留された貯留槽９１から延びる輸送ホース９２が接続され、貯留槽９１又は輸送ホース９２に配置されたポンプ９３の駆動によって貯留槽９１からセメントミルクが供給される。 A transport hose 92 extending from a storage tank 91 in which cement milk is stored is connected to the ground improvement machine 1, and cement milk is supplied from the storage tank 91 by driving a pump 93 arranged in the storage tank 91 or the transport hose 92. Will be done.
地盤改良駆動部４は、リーダーマスト２１に対して昇降可能に該リーダーマスト２１に配置され、地盤（地中）に鉛直方向に延びる円柱状の穴を掘削すると共に、掘削した円柱状の穴の内部において掘削土（掘削された土）と貯留槽９１から供給されるセメントミルクとを撹拌する。 The ground improvement drive unit 4 is arranged in the leader mast 21 so as to be able to move up and down with respect to the leader mast 21, and a columnar hole extending in the vertical direction is excavated in the ground (underground) and the excavated columnar hole is excavated. Inside, the excavated soil (excavated soil) and the cement milk supplied from the storage tank 91 are agitated.
具体的に、地盤改良駆動部４は、略鉛直方向に延びる長尺なオーガロッド４１と、オーガロッド４１の下端（先端）に着脱可能に取り付けられる掘削撹拌装置３と、オーガロッド４１を回転させる回転駆動装置４２と、を有する。 Specifically, the ground improvement drive unit 4 rotates a long auger rod 41 extending in a substantially vertical direction, an excavation agitator 3 detachably attached to the lower end (tip) of the auger rod 41, and an auger rod 41. It has a rotation drive device 42 and.
オーガロッド４１は、略鉛直方向に延びる中心軸Ｃ１を有し、該中心軸Ｃ１周りに回転可能で且つ昇降可能にリーダーマスト２１に支持されている。このオーガロッド４１は、内部を長尺方向に下端まで延び且つ貯留槽９１から供給されるセメントミルクが流通可能な内部流路４１１を有する。 Auger rod 41 is supported by the central axis C 1 has, and vertically movable leader mast 21 rotatable central axis C 1 around a substantially vertically extending. The auger rod 41 has an internal flow path 411 that extends in the elongated direction to the lower end and allows the cement milk supplied from the storage tank 91 to flow.
回転駆動装置４２は、オーガロッド４１を中心軸Ｃ１周りに回転駆動する。本実施形態の回転駆動装置４２は、オーガロッド４１の上端に接続されている。 Rotary drive device 42, driven to rotate the central axis C 1 around the auger rod 41. The rotary drive device 42 of the present embodiment is connected to the upper end of the auger rod 41.
掘削撹拌装置３は、図２及び図３にも示すように、オーガロッド４１の回転に伴って中心軸Ｃ２周りに回転する複数の回転翼３２と、中心軸Ｃ２方向における回転翼３２と隣り合った位置においてオーガロッド４１に対して回転自在に配置されると共に、掘削土の回転翼３２との共回りを防止する複数の共回り防止翼３５と、を有する。これら複数の回転翼３２と複数の共回り防止翼３５とは、中心軸Ｃ２周りに相対回転可能である。また、掘削撹拌装置３は、回転翼３２又は共回り防止翼３５から延びる延出板３３も有する。本実施形態の掘削撹拌装置３では、延出板３３は、回転翼３２から延びる。 Drilling stirrer 3, as shown in FIGS. 2 and 3, a plurality of rotary blades 32 rotating about axis C 2 around with the rotation of the auger rod 41, the rotary blade 32 in the central axis C 2 direction It has a plurality of co-rotation prevention blades 35 that are rotatably arranged with respect to the auger rod 41 at adjacent positions and that prevent co-rotation of the excavated soil with the rotor blade 32. The plurality of rotary blades 32 and the plurality of co-rotation prevention blades 35 can rotate relative to each other around the central axis C2. The excavation stirring device 3 also has an extension plate 33 extending from the rotary blade 32 or the co-rotation prevention blade 35. In the excavation stirring device 3 of the present embodiment, the extension plate 33 extends from the rotary blade 32.
具体的に、掘削撹拌装置３は、中心軸Ｃ２を有し且つ該中心軸Ｃ２をオーガロッド４１の中心軸Ｃ１に一致させた状態で該オーガロッド４１の下端に接続される軸部３１と、軸部３１から中心軸Ｃ２と直交する方向に延びる複数の回転翼３２と、回転翼３２から共回り防止翼３５側に延びる延出板３３と、軸部３１の周囲を囲うボス部３４と、ボス部３４から中心軸Ｃ２と直交する方向に延びる複数の共回り防止翼３５と、軸部３１の先端部（オーガロッド４１に接続される端部（基端部）３１ａと反対側の端部）３１ｂに配置される先端ビット部３６と、を有する。 Specifically, the drilling stirrer 3, the shaft portion connected to the lower end of the auger rod 41 the central axis C 2 has and the central axis C 2 in a state of being aligned with the center axis C 1 of the auger rod 41 31, a plurality of rotary blades 32 extending from the shaft portion 31 in a direction orthogonal to the central axis C 2 , an extension plate 33 extending from the rotary blade 32 toward the co-rotation prevention blade 35, and a boss surrounding the shaft portion 31. A portion 34, a plurality of co-rotation prevention blades 35 extending from the boss portion 34 in a direction orthogonal to the central axis C 2, and a tip portion (end portion (base end portion) 31a connected to the auger rod 41) of the shaft portion 31. It has a tip bit portion 36, which is arranged at an end portion) 31b on the opposite side.
尚、本実施形態の地盤改良機１では、オーガロッド４１の中心軸Ｃ１と軸部３１の中心軸Ｃ２とが一致するようにオーガロッド４１の下端に軸部３１が接続されるため、以下では、中心軸Ｃ１、Ｃ２を単に「中心軸Ｃ」と称する。 In the soil improvement machine 1 of this embodiment, since the shaft portion 31 is connected to the lower end of the auger rod 41 as the central axis C 2 of the center axis C 1 and the shaft portion 31 of the auger rod 41 coincide, Hereinafter, the central axes C 1 and C 2 are simply referred to as "central axes C".
軸部３１は、中心軸Ｃ方向に延びている。具体的に、軸部３１は、基端部３１ａに設けられ且つオーガロッド４１の下端に嵌入されることで掘削撹拌装置３とオーガロッド４１とを連結するジョイント部３１１と、オーガロッド４１の内部流路４１１と連通する内部流路３１２と、先端部３１ｂに設けられ且つセメントミルクを内部流路３１２から外部（掘削撹拌装置３の外部）に吐出可能な吐出口３１３と、を有する。また、軸部３１は、中心軸Ｃ方向の途中位置において該中心軸Ｃ方向に間隔をあけて配置される一対の鍔部３１４を有する。 The shaft portion 31 extends in the central axis C direction. Specifically, the shaft portion 31 is provided at the base end portion 31a and is fitted into the lower end of the auger rod 41 to connect the excavation agitator 3 and the auger rod 41 to the joint portion 311 and the inside of the auger rod 41. It has an internal flow path 312 communicating with the flow path 411 and a discharge port 313 provided at the tip portion 31b and capable of discharging cement milk from the internal flow path 312 to the outside (outside of the excavation agitator 3). Further, the shaft portion 31 has a pair of collar portions 314 arranged at intervals in the central axis C direction at an intermediate position in the central axis C direction.
複数の回転翼３２は、それぞれが軸部３１から中心軸Ｃと直交する方向に沿って延び且つ掘削撹拌装置３の回転方向に間隔をあけて配置される。本実施形態の掘削撹拌装置３は、中心軸Ｃ方向の同じ位置において周方向に間隔をあけて配置される複数の回転翼３２を回転翼の組３２Ａとして、複数の回転翼の組３２Ａを有する。これら複数の回転翼の組３２Ａは、中心軸Ｃ方向に間隔をあけて配置される。 The plurality of rotary blades 32 extend from the shaft portion 31 along the direction orthogonal to the central axis C and are arranged at intervals in the rotational direction of the excavation stirring device 3. The excavation agitation device 3 of the present embodiment has a plurality of rotary blade sets 32A, with a plurality of rotary blades 32 arranged at the same position in the central axis C direction at intervals in the circumferential direction as a rotary blade set 32A. .. The plurality of rotary blade sets 32A are arranged at intervals in the central axis C direction.
本実施形態の掘削撹拌装置３では、複数の回転翼の組３２Ａのうちの軸部３１の先端部３１ｂに配置される回転翼の組である第一の組３２Ａ１が、掘削翼３２１によって構成され、複数の回転翼の組３２Ａのうちの残りの回転翼の組である第二の組３２Ａ２が、撹拌翼３２２によって構成されている。 In the excavation stirring device 3 of the present embodiment, the first set 32A 1 which is a set of rotary blades arranged at the tip portion 31b of the shaft portion 31 of the plurality of sets 32A of the rotary blades is composed of the excavation blades 321. The second set 32A 2 , which is the remaining set of rotors out of the set 32A of the plurality of rotors, is composed of the stirring blades 322.
本実施形態の第一の組３２Ａ１は、二つの掘削翼３２１によって構成され、前記二つの掘削翼３２１は、軸部３１からそれぞれ反対方向に延びている。即ち、中心軸Ｃ方向から見て、一方の掘削翼３２１と他方の掘削翼３２１とのなす角は、１８０°である。また、二つの第二の組３２Ａ２は、それぞれ二つの撹拌翼３２２によって構成され、前記二つの撹拌翼３２２は、軸部３１からそれぞれ反対方向に延びている。即ち、中心軸Ｃ方向から見て、一方の撹拌翼３２２と他方の撹拌翼３２２とのなす角は、１８０°である。さらに、一方の第二の組３２Ａ２を構成する二つの撹拌翼３２２がそれぞれ延びる方向と、他方の第二の組３２Ａ２を構成する二つの撹拌翼３２２がそれぞれ延びる方向とは、中心軸Ｃ方向から見て、９０°ずれている。また、本実施形態の掘削撹拌装置３では、中心軸Ｃ方向の一方側（図３における下側）の第二の組３２Ａ２を構成する二つの撹拌翼３２２のそれぞれは、中心軸Ｃ方向から見て掘削翼３２１と回転方向に９０°変位した方向に延び、中心軸Ｃ方向の他方側（図２における上側）の第二の組３２Ａ２を構成する二つの撹拌翼３２２のそれぞれは、中心軸Ｃ方向から見て掘削翼３２１と同じ方向に延びている。尚、各回転翼の組３２Ａ１、３２Ａ２を構成する翼（掘削翼３２１、撹拌翼３２２）の数は、二つに限定されず、三つ以上でもよい。 The first set 32A 1 of the present embodiment is composed of two excavation blades 321. The two excavation blades 321 extend in opposite directions from the shaft portion 31. That is, the angle formed by one excavation blade 321 and the other excavation blade 321 when viewed from the central axis C direction is 180 °. Further, each of the two second sets 32A 2 is composed of two stirring blades 322, and the two stirring blades 322 extend from the shaft portion 31 in opposite directions. That is, the angle formed by one stirring blade 322 and the other stirring blade 322 when viewed from the central axis C direction is 180 °. Furthermore, one of the second set 32A direction 2 two stirring blades 322 constituting the extend respectively, and the direction in which the two stirring blades 322 extend respectively constituting the other of the second set 32A 2, the center axis C Seen from the direction, it is off by 90 °. Further, in the excavation stirring device 3 of the present embodiment , each of the two stirring blades 322 constituting the second set 32A 2 on one side (lower side in FIG. 3) in the central axis C direction is from the central axis C direction. As seen, each of the two stirring blades 322 extending in the direction displaced by 90 ° in the rotation direction from the excavation blade 321 and forming the second set 32A 2 on the other side (upper side in FIG. 2) in the central axis C direction is the center. It extends in the same direction as the excavation blade 321 when viewed from the axis C direction. The number of blades (excavation blades 321 and stirring blades 322) constituting the sets 32A 1 and 32A 2 of each rotary blade is not limited to two, and may be three or more.
また、本実施形態の掘削撹拌装置３では、ボス部３４より先端部３１ｂ側に第一の組３２Ａ１が一つ配置され、ボス部３４より基端部３１ａ側に第二の組３２Ａ２が二つ配置されている。第一の組３２Ａ１は、中心軸Ｃ方向においてボス部３４（複数の共回り防止翼３５）と隣り合う位置に配置され、二つの第二の組３２Ａ２のうちの先端部３１ｂ側（中心軸Ｃ方向の一方側）の第二の組３２Ａ２も、中心軸Ｃ方向においてボス部３４（複数の共回り防止翼３５）と隣り合う位置に配置されている。 Further, in the excavation stirring device 3 of the present embodiment, one first set 32A 1 is arranged on the tip end 31b side of the boss portion 34, and the second set 32A 2 is arranged on the base end portion 31a side of the boss portion 34. Two are arranged. The first set 32A 1 is arranged at a position adjacent to the boss portion 34 (plural co-rotation prevention blades 35) in the central axis C direction, and is on the tip end 31b side (center ) of the two second sets 32A 2. The second set 32A 2 (on one side in the axis C direction) is also arranged at a position adjacent to the boss portion 34 (plural co-rotation prevention blades 35) in the central axis C direction.
複数の掘削翼３２１のそれぞれは、軸部３１から中心軸Ｃと直交する方向に延びる板状の掘削翼本体３２１１と、掘削翼本体３２１１に沿って軸部３１から延びる突条の補強部３２１２と、掘削翼本体３２１１における中心軸Ｃ方向の一方側の端縁３２１１ａから突出する複数の掘削ビット３２１３と、を有する。 Each of the plurality of excavation blades 321 has a plate-shaped excavation blade main body 3211 extending from the shaft portion 31 in a direction orthogonal to the central axis C, and a ridge reinforcing portion 3212 extending from the shaft portion 31 along the excavation blade main body 3211. , A plurality of excavation bits 3213 protruding from one end edge 3211a in the central axis C direction in the excavation blade main body 3211.
掘削翼本体３２１１は、中心軸Ｃと直交する方向に長尺な略矩形の板状であり、地盤の掘削の際に回転する方向（以下、「第一回転方向」と称する。）側の部位ほど中心軸Ｃ方向の一方側に位置するように中心軸Ｃに対して傾斜している。 The excavation wing main body 3211 has a substantially rectangular plate shape that is long in a direction orthogonal to the central axis C, and is a portion on the side in the direction of rotation (hereinafter, referred to as "first rotation direction") during excavation of the ground. It is inclined with respect to the central axis C so as to be located on one side in the central axis C direction.
複数の掘削翼３２１の各掘削翼本体３２１１における中心軸Ｃ方向の他方側の端縁３２１１ｂは、中心軸Ｃと直交する方向にそれぞれ真っ直ぐに延びている。そして、中心軸Ｃ方向における各掘削翼本体３２１１の端縁３２１１ｂの位置は、それぞれ同じである。 The other end edge 3211b of each of the drilling blades 321 of the plurality of drilling blades 321 in the direction of the central axis C extends straight in the direction orthogonal to the central axis C. The positions of the edge 3211b of each excavation blade main body 3211 in the central axis C direction are the same.
補強部３２１２は、掘削翼本体３２１１の裏面（第一回転方向と反対側の面）３２１１ｒから突出すると共に軸部３１から掘削翼本体３２１１の先端（軸部３１と反対側の端部）に向けて延びている。 The reinforcing portion 3212 protrudes from the back surface (the surface opposite to the first rotation direction) 3211r of the excavation blade main body 3211 and faces the tip of the excavation blade main body 3211 (the end opposite to the shaft portion 31) from the shaft portion 31. Is extending.
複数の掘削ビット３２１３は、掘削翼本体３２１１の端縁３２１１ａに沿って間隔をあけて並んでいる。複数の掘削ビット３２１３のそれぞれは、掘削翼本体３２１１の傾斜面（表面）３２１１ｆに対して傾斜し且つ第一回転方向に向かうように、端縁３２１１ａから突出している。 The plurality of excavation bits 3213 are arranged at intervals along the edge 3211a of the excavation blade main body 3211. Each of the plurality of excavation bits 3213 is inclined with respect to the inclined surface (surface) 3211f of the excavation blade main body 3211 and protrudes from the end edge 3211a so as to be directed in the first rotation direction.
複数の撹拌翼３２２のそれぞれは、軸部３１から中心軸Ｃと直交する方向に延びる板状の撹拌翼本体３２２１と、撹拌翼本体３２２１に沿って軸部３１から延びる突条の補強部３２２２と、を有する。 Each of the plurality of stirring blades 322 includes a plate-shaped stirring blade main body 3221 extending from the shaft portion 31 in a direction orthogonal to the central axis C, and a ridge reinforcing portion 3222 extending from the shaft portion 31 along the stirring blade main body 3221. , Have.
撹拌翼本体３２２１は、中心軸Ｃと直交する方向に長尺な略矩形の板状であり、第一回転方向側の部位ほど中心軸Ｃ方向の一方側に位置するように中心軸Ｃに対して傾斜している。 The stirring blade main body 3221 has a substantially rectangular plate shape that is long in the direction orthogonal to the central axis C, and the portion on the first rotation direction side is located on one side in the central axis C direction with respect to the central axis C. Is tilted.
補強部３２２２は、撹拌翼本体３２２１の裏面（第一回転方向と反対側の面）３２２１ｒから突出すると共に軸部３１から撹拌翼本体３２２１の先端（軸部３１と反対側の端部）に向けて延びている。 The reinforcing portion 3222 protrudes from the back surface (the surface opposite to the first rotation direction) 3221r of the stirring blade main body 3221 and faces the tip of the stirring blade main body 3221 (the end opposite to the shaft portion 31) from the shaft portion 31. Is extending.
延出板３３は、掘削翼３２１（掘削翼本体３２１１）における中心軸Ｃ方向の他方側（共回り防止翼３５側）の端縁３２１１ｂから、掘削翼３２１（回転翼３２）と共回り防止翼３５とが中心軸Ｃ周りに相対回転したときに共回り防止翼３５と接触しない範囲で中心軸Ｃ方向の他方側に延出する。この延出板３３は、掘削翼３２１が回転（第一回転方向に回転）したときに、延出方向の先端側（共回り防止翼３５側）の部位が共回り防止翼３５に対する回転方向と反対側（第一回転方向と反対の回転方向（第二回転方向）側）に変位するように弾性変形可能である（図６参照）。 The extension plate 33 is formed from the end edge 3211b of the excavation blade 321 (excavation blade main body 3211) on the other side (co-rotation prevention blade 35 side) in the central axis C direction to the excavation blade 321 (rotor blade 32) and the co-rotation prevention blade. When the 35 and the relative rotation around the central axis C, they extend to the other side in the central axis C direction within a range that does not come into contact with the co-rotation prevention blade 35. In this extension plate 33, when the excavation blade 321 rotates (rotates in the first rotation direction), the portion on the tip side (co-rotation prevention blade 35 side) in the extension direction is the rotation direction with respect to the co-rotation prevention blade 35. It can be elastically deformed so as to be displaced in the opposite side (the side opposite to the first rotation direction (second rotation direction)) (see FIG. 6).
本実施形態の延出板３３は、矩形のいわゆるバネ板であり、掘削翼本体３２１１の表面３２１１ｆと略平行で且つ第二回転方向側に向かうように、掘削翼本体３２１１の端縁３２１１ｂから延びている。延出板３３は、例えば、ステンレス鋼やばね鋼鋼材等によって構成される板部材であり、厚みは、２ｍｍ〜４ｍｍである。この延出板３３の厚みや受面積は、掘削翼３２１が回転したときに掘削土に含まれる塊（土塊やガラ等）から受ける反力に基づいて設定される。尚、延出板３３は、複数枚が重なった状態で掘削翼本体３２１１に取り付けられる場合もある。 The extension plate 33 of the present embodiment is a rectangular so-called spring plate, and extends from the end edge 3211b of the excavation blade body 3211 so as to be substantially parallel to the surface 3211f of the excavation blade body 3211 and toward the second rotation direction side. ing. The extension plate 33 is a plate member made of, for example, stainless steel, spring steel, or the like, and has a thickness of 2 mm to 4 mm. The thickness and receiving area of the extension plate 33 are set based on the reaction force received from the mass (soil mass, glass, etc.) contained in the excavated soil when the excavation blade 321 rotates. The extension plate 33 may be attached to the excavation blade main body 3211 in a state where a plurality of the extension plates 33 are overlapped with each other.
また、各掘削翼３２１には、複数（図２に示す例では、二つ）の延出板３３が配置されている。各掘削翼３２１における複数の延出板３３の位置（中心軸Ｃと直交する方向における軸部３１から距離）は、それぞれ異なっている。具体的に、各延出板３３の位置は、中心軸Ｃ方向の同じ位置で二つの掘削翼３２１が中心軸Ｃ周りに回転したときに、一方の掘削翼（図２の右側の掘削翼）３２１に配置された延出板３３が通過する各領域と、他方の掘削翼（図２の左側の掘削翼）３２１に配置された延出板３３が通過する各領域とが重ならないように、それぞれ設定されている。 Further, a plurality of (two in the example shown in FIG. 2) extension plates 33 are arranged on each excavation blade 321. The positions of the plurality of extension plates 33 (distance from the shaft portion 31 in the direction orthogonal to the central axis C) in each excavation blade 321 are different from each other. Specifically, the position of each extension plate 33 is one of the excavation blades (the excavation blade on the right side in FIG. 2) when the two excavation blades 321 rotate around the central axis C at the same position in the central axis C direction. Each area through which the extension plate 33 arranged in 321 passes and each area through which the extension plate 33 arranged in the other excavation blade (excavation blade on the left side of FIG. 2) 321 passes do not overlap. Each is set.
ボス部３４は、中心軸Ｃ方向における掘削翼３２１と撹拌翼（中心軸Ｃ方向の一方側の第二の組３２Ａ２を構成する撹拌翼）３２２との間において、軸部３１の周囲を囲い且つ共回り防止翼３５が配置された筒状の部材である。本実施形態のボス部３４は、一対の鍔部３１４の間において軸部３１の周囲を囲う。このボス部３４は、軸部３１周りに回転自在である。具体的に、ボス部３４は、図４にも示すように、金属製の筒状の外殻部３４１と、外殻部３４１の径方向内側（内周面側）に配置されて軸部３１と接触する筒状の摺接部３４２と、を有する。 The boss portion 34 surrounds the circumference of the shaft portion 31 between the excavation blade 321 in the central axis C direction and the stirring blade ( the stirring blade forming the second set 32A 2 on one side in the central axis C direction) 322. Moreover, it is a tubular member in which the co-rotation prevention blade 35 is arranged. The boss portion 34 of the present embodiment surrounds the shaft portion 31 between the pair of collar portions 314. The boss portion 34 is rotatable around the shaft portion 31. Specifically, as shown in FIG. 4, the boss portion 34 is arranged on the radial inner side (inner peripheral surface side) of the metal tubular outer shell portion 341 and the outer shell portion 341, and the shaft portion 31. It has a tubular sliding contact portion 342 that comes into contact with.
摺接部３４２は、軸部３１がオーガロッド４１の回転に伴って中心軸Ｃ周りに回転したときに該軸部３１の外周面と摺接する。本実施形態の摺接部３４２は、合成樹脂、より詳しくは、ＭＣナイロン（登録商標）によって形成されている。このように樹脂を用いることで、軸部３１周りをボス部３４が回転したとき、即ち、軸部３１とボス部３４とが相対回転したときに、摩耗による金属粉の発生が抑えられる。 The sliding contact portion 342 comes into sliding contact with the outer peripheral surface of the shaft portion 31 when the shaft portion 31 rotates around the central axis C with the rotation of the auger rod 41. The sliding contact portion 342 of the present embodiment is formed of a synthetic resin, more specifically, MC nylon (registered trademark). By using the resin in this way, when the boss portion 34 rotates around the shaft portion 31, that is, when the shaft portion 31 and the boss portion 34 rotate relative to each other, the generation of metal powder due to wear can be suppressed.
複数の共回り防止翼３５は、それぞれがボス部３４（詳しくは、外殻部３４１の外周面）から中心軸Ｃと直交する方向に沿って延び且つ回転方向に間隔をあけて配置される。本実施形態のボス部３４には、二つの共回り防止翼３５（第一の共回り防止翼３５Ａ、第二の共回り防止翼３５Ｂ）が配置され、これら二つの共回り防止翼３５は、ボス部３４からそれぞれ反対方向に延びている。即ち、中心軸Ｃ方向から見て、第一の共回り防止翼３５Ａと第二の共回り防止翼３５Ｂとのなす角は、１８０°である。尚、共回り防止翼３５の数は、二つに限定されず、三つ以上でもよい。 Each of the plurality of co-rotation prevention blades 35 extends from the boss portion 34 (specifically, the outer peripheral surface of the outer shell portion 341) along the direction orthogonal to the central axis C and is arranged at intervals in the rotation direction. Two co-rotation prevention wings 35 (first co-rotation prevention wing 35A, second co-rotation prevention wing 35B) are arranged on the boss portion 34 of the present embodiment, and these two co-rotation prevention wings 35 are They extend from the boss portion 34 in opposite directions. That is, the angle formed by the first co-rotation prevention blade 35A and the second co-rotation prevention blade 35B when viewed from the central axis C direction is 180 °. The number of co-rotation prevention blades 35 is not limited to two, and may be three or more.
以上のように、本実施形態の掘削撹拌装置３では、複数の共回り防止翼３５のそれぞれがボス部３４から延び、且つボス部３４が軸部３１に対して回転自在であるため、各共回り防止翼３５は、軸部３１に対して回転自在である。 As described above, in the excavation stirring device 3 of the present embodiment, since each of the plurality of co-rotation prevention blades 35 extends from the boss portion 34 and the boss portion 34 is rotatable with respect to the shaft portion 31, each of them The rotation prevention blade 35 is rotatable with respect to the shaft portion 31.
第一の共回り防止翼３５Ａは、ボス部３４から中心軸Ｃと直交する方向に延びる板状の部位である。具体的に、第一の共回り防止翼３５Ａは、中心軸Ｃ方向及び中心軸Ｃと直交する方向を含む面に沿うと共に、中心軸Ｃ方向と直交する方向に長尺で且つ真っ直ぐに延びる帯板状である。第一の共回り防止翼３５Ａにおける中心軸Ｃと直交する方向の寸法は、掘削翼３２１における中心軸Ｃと直交する方向の寸法、及び撹拌翼３２２における中心軸Ｃと直交する方向の寸法のそれぞれより大きい。 The first co-rotation prevention blade 35A is a plate-shaped portion extending from the boss portion 34 in a direction orthogonal to the central axis C. Specifically, the first co-rotation prevention blade 35A is a band that is long and straight in the direction orthogonal to the central axis C direction as well as along the surface including the central axis C direction and the direction orthogonal to the central axis C. It is plate-shaped. The dimensions of the first co-rotation prevention blade 35A in the direction orthogonal to the central axis C are the dimensions in the direction orthogonal to the central axis C in the excavation blade 321 and the dimensions in the direction orthogonal to the central axis C in the stirring blade 322, respectively. Greater.
第二の共回り防止翼３５Ｂは、ボス部３４における第一の共回り防止翼３５Ａと中心軸Ｃを挟んで反対側の位置から、第一の共回り防止翼３５Ａの延びる方向と反対向きに延びる板状の部位である。具体的に、第二の共回り防止翼３５Ｂは、中心軸Ｃ方向及び中心軸Ｃと直交する方向を含む面に沿うと共に、長尺で且つ途中で屈曲するように延びる帯板状である。詳しくは、第二の共回り防止翼３５Ｂは、ボス部３４から離れるにつれて掘削翼３２１側（中心軸Ｃ方向の一方側）に位置するように中心軸Ｃと直交する方向に対して傾斜した方向に延びる傾斜部３５１Ｂと、傾斜部３５１Ｂの先端（軸部３１と反対側の端部）から中心軸Ｃと直交する方向に真っ直ぐ延びる平行部３５２Ｂと、を有する。この平行部３５２Ｂは、相対回転によって掘削翼３２１と第二の共回り防止翼３５Ｂとが中心軸Ｃ方向から見て重なる位置となったときに、掘削翼３２１と平行になる部位である（図２参照）。また、第二の共回り防止翼３５Ｂにおける中心軸Ｃと直交する方向の寸法は、第一の共回り防止翼３５Ａと同じ、即ち、掘削翼３２１における中心軸Ｃと直交する方向の寸法、及び撹拌翼３２２における中心軸Ｃと直交する方向の寸法のそれぞれより大きい。 The second co-rotation prevention wing 35B is located on the boss portion 34 from a position opposite to the first co-rotation prevention wing 35A with the central axis C in between, in the direction opposite to the extending direction of the first co-rotation prevention wing 35A. It is a plate-shaped part that extends. Specifically, the second co-rotation prevention blade 35B has a strip-like shape that extends along a surface including the direction of the central axis C and the direction orthogonal to the central axis C, and is long and bends in the middle. Specifically, the second co-rotation prevention blade 35B is inclined with respect to the direction orthogonal to the central axis C so as to be located on the excavation blade 321 side (one side in the central axis C direction) as the distance from the boss portion 34 increases. It has an inclined portion 351B extending in a straight direction, and a parallel portion 352B extending straight from the tip end of the inclined portion 351B (the end portion opposite to the shaft portion 31) in a direction orthogonal to the central axis C. This parallel portion 352B is a portion that becomes parallel to the excavation blade 321 when the excavation blade 321 and the second co-rotation prevention blade 35B overlap each other when viewed from the central axis C direction due to relative rotation (FIG. 2). Further, the dimensions of the second co-rotation prevention blade 35B in the direction orthogonal to the central axis C are the same as those of the first co-rotation prevention blade 35A, that is, the dimensions of the excavation blade 321 in the direction orthogonal to the central axis C, and It is larger than each of the dimensions of the stirring blade 322 in the direction orthogonal to the central axis C.
以上のように、掘削撹拌装置３において、複数の共回り防止翼３５のうちの一部の共回り防止翼である第一の共回り防止翼３５Ａと各掘削翼３２１（回転翼３２）との中心軸Ｃ方向の間隔は、複数の共回り防止翼３５のうちの残りの共回り防止翼である第二の共回り防止翼３５Ｂと各掘削翼３２１（回転翼３２）との中心軸Ｃ方向の間隔より大きい。詳しくは、相対回転によって中心軸Ｃ方向から見て共回り防止翼３５と掘削翼３２１とが重なった状態において、第一の共回り防止翼３５Ａと各掘削翼３２１との中心軸Ｃ方向の間隔（第一間隔α１）は、第二の共回り防止翼３５Ｂの平行部３５２Ｂと各掘削翼３２１との中心軸Ｃ方向の間隔（第二間隔α２）より大きい（図２参照）。 As described above, in the excavation stirring device 3, the first co-rotation prevention blade 35A, which is a part of the co-rotation prevention blades 35 among the plurality of co-rotation prevention blades 35, and each excavation blade 321 (rotary blade 32). The distance in the central axis C direction is the central axis C direction between the second co-rotation prevention blade 35B, which is the remaining co-rotation prevention blade of the plurality of co-rotation prevention blades 35, and each excavation blade 321 (rotary blade 32). Greater than the interval. Specifically, in a state where the co-rotation prevention blade 35 and the excavation blade 321 overlap each other when viewed from the central axis C direction due to relative rotation, the distance between the first co-rotation prevention blade 35A and each excavation blade 321 in the central axis C direction. (First distance α 1 ) is larger than the distance (second distance α 2 ) between the parallel portion 352B of the second co-rotation prevention blade 35B and each excavation blade 321 in the central axis C direction (see FIG. 2).
また、掘削撹拌装置３において、第二の共回り防止翼３５Ｂ（平行部３５２Ｂ）と、先端部３１ｂ側の第二の組３２Ａ２を構成する各撹拌翼３２２（回転翼３２）との中心軸Ｃ方向の間隔（第三間隔α３）は、第一の共回り防止翼３５Ａと、先端部３１ｂ側の第二の組３２Ａ２を構成する各撹拌翼３２２（回転翼３２）との中心軸Ｃ方向の間隔（第四間隔α４）より大きい。 Further, in the excavation stirring device 3, the central axis of the second co-rotation prevention blade 35B (parallel portion 352B) and each stirring blade 322 (rotary blade 32) constituting the second set 32A 2 on the tip portion 31b side. The distance in the C direction (third distance α 3 ) is the central axis between the first co-rotation prevention blade 35A and each stirring blade 322 (rotary blade 32) constituting the second set 32A 2 on the tip end 31b side. It is larger than the interval in the C direction (fourth interval α 4).
また、本実施形態の掘削撹拌装置３では、第一間隔α１と第三間隔α３とが同じ若しくは略同じ大きさであり、第二間隔α２と第四間隔α４とが同じ若しくは略同じ大きさである。 Further, in the excavation stirring device 3 of the present embodiment, the first interval α 1 and the third interval α 3 are the same or substantially the same size, and the second interval α 2 and the fourth interval α 4 are the same or substantially the same. It is the same size.
尚、第一及び第二間隔α１、α２は、掘削翼３２１における共回り防止翼３５側の端縁３２１１ｂと、共回り防止翼３５における掘削翼３２１側の端縁（第二の共回り防止翼３５Ｂにおいては、平行部３５２Ｂにおける掘削翼３２１側の端縁）と、の中心軸Ｃ方向の距離である。また、第三及び第四間隔α３、α４は、共回り防止翼３５における撹拌翼３２２側の端縁（第二の共回り防止翼３５Ｂにおいては、平行部３５２Ｂにおける撹拌翼３２２側の端縁）と、撹拌翼３２２における共回り防止翼３５側の端縁と、の中心軸Ｃ方向の距離である。 The first and second intervals α 1 and α 2 are the end edge 3211b on the side of the co-rotation prevention blade 35 in the excavation blade 321 and the end edge on the excavation blade 321 side in the co-rotation prevention blade 35 (second co-rotation). In the prevention blade 35B, it is the distance in the direction of the central axis C from the edge of the parallel portion 352B on the excavation blade 321 side). Further, the third and fourth intervals α 3 and α 4 are the ends on the stirring blade 322 side of the co-rotation prevention blade 35 (in the second co-rotation prevention blade 35B, the ends on the stirring blade 322 side in the parallel portion 352B. The distance between the edge) and the edge of the stirring blade 322 on the side of the co-rotation prevention blade 35 in the central axis C direction.
本実施形態の掘削撹拌装置３においては、掘削翼３２１と第一の共回り防止翼３５Ａとの中心軸Ｃ方向の間隔（第一間隔）α１は、１６０ｍｍ〜１９０ｍｍであり、延出板３３と第一の共回り防止翼３５Ａとの中心軸Ｃ方向の間隔は、１１８ｍｍである。また、掘削翼３２１と第二の共回り防止翼３５Ｂ（平行部３５２Ｂ）との中心軸Ｃ方向の間隔（第二間隔）α２は、１００ｍｍ〜１３０ｍｍであり、延出板３３と第二の共回り防止翼３５Ｂ（平行部３５２Ｂ）との中心軸Ｃ方向の間隔は、４６ｍｍである。また、第一の共回り防止翼３５Ａと撹拌翼３２２との中心軸Ｃ方向の間隔（第四間隔）α４は、１００ｍｍ〜１３０ｍｍであり、第二の共回り防止翼３５Ｂと撹拌翼３２２との中心軸Ｃ方向の間隔（第三間隔）α３は、１９０ｍｍ〜２１０ｍｍである。 In the excavation stirring device 3 of the present embodiment, the distance (first distance) α 1 between the excavation blade 321 and the first co-rotation prevention blade 35A in the central axis C direction is 160 mm to 190 mm, and the extension plate 33. The distance between the first co-rotation prevention blade 35A and the first co-rotation prevention blade 35A in the central axis C direction is 118 mm. Further, the distance (second distance) α 2 between the excavation blade 321 and the second co-rotation prevention blade 35B (parallel portion 352B) in the central axis C direction is 100 mm to 130 mm, and the extension plate 33 and the second The distance from the co-rotation prevention blade 35B (parallel portion 352B) in the central axis C direction is 46 mm. Further, the distance (fourth distance) α 4 between the first co-rotation prevention blade 35A and the stirring blade 322 in the central axis C direction is 100 mm to 130 mm, and the second co-rotation prevention blade 35B and the stirring blade 322 The distance (third distance) α 3 in the direction of the central axis C is 190 mm to 210 mm.
先端ビット部３６は、複数（本実施形態の例では、二つ）の掘削ビット３６１を有し、軸部３１の先端部３１ｂに配置されている。 The tip bit portion 36 has a plurality of (two in the example of the present embodiment) excavation bits 361, and is arranged at the tip portion 31b of the shaft portion 31.
以上のように構成される地盤改良機１は、以下のようにして地盤改良を行う、即ち、地盤内に円柱状の造成体を形成する。 The ground improvement machine 1 configured as described above performs ground improvement as follows, that is, forms a columnar structure in the ground.
先ず、地盤改良駆動部４がオーガロッド４１を第一回転方向に回転させることで、掘削撹拌装置３（掘削翼３２１）が中心軸Ｃ周りに回転する。この状態で地盤改良駆動部４がリーダーマスト２１に沿って降下することで、掘削撹拌装置３が地盤を柱状に掘削する。 First, the ground improvement drive unit 4 rotates the auger rod 41 in the first rotation direction, so that the excavation stirring device 3 (excavation blade 321) rotates around the central axis C. In this state, the ground improvement drive unit 4 descends along the leader mast 21, and the excavation agitator 3 excavates the ground in a columnar shape.
このとき、共回り防止翼３５の先端が掘削翼３２１及び撹拌翼３２２の先端よりも外側（中心軸Ｃと直交する方向の外側）に突出しているため、掘削翼３２１が掘削した穴の周壁に共回り防止翼３５がその先端部を食い込ませた状態で、掘削撹拌装置３（地盤改良駆動部４）が地盤を掘削しつつ降下する。これにより、共回り防止翼３５の回転（中心軸Ｃ周りの回転）が抑えられた状態で掘削翼３２１と撹拌翼３２２とが中心軸Ｃ周りに回転する、即ち、共回り防止翼３５と、掘削翼３２１及び撹拌翼３２２とが相対回転する。 At this time, since the tip of the co-rotation prevention blade 35 projects to the outside (outside in the direction orthogonal to the central axis C) from the tips of the excavation blade 321 and the stirring blade 322, the tip of the excavation blade 321 extends to the peripheral wall of the excavated hole. The excavation agitator 3 (ground improvement drive unit 4) descends while excavating the ground with the co-rotation prevention blade 35 biting into the tip portion thereof. As a result, the excavation blade 321 and the stirring blade 322 rotate around the central axis C while the rotation of the co-rotation prevention blade 35 (rotation around the central axis C) is suppressed, that is, the co-rotation prevention blade 35 and the co-rotation prevention blade 35. The excavation blade 321 and the stirring blade 322 rotate relative to each other.
掘削撹拌装置３が所定の深さまで到達すると、地盤改良駆動部４の降下が止まる。続いて、地盤改良駆動部４は、オーガロッド４１を第二回転方向に回転させ（回転方向を逆回転にし）、上昇し始める。このとき、地盤改良機１には貯留槽９１から輸送ホース９２を通じてセメントミルクが供給され、供給されたセメントミルクは、オーガロッド４１及び掘削撹拌装置３の内部流路４１１、３１２を経て、掘削撹拌装置３（軸部３１）の先端（下端）の吐出口３１３から穴（掘削撹拌装置３の掘削により形成された柱状の穴）の内部に吐出される。 When the excavation agitation device 3 reaches a predetermined depth, the descent of the ground improvement drive unit 4 stops. Subsequently, the ground improvement drive unit 4 rotates the auger rod 41 in the second rotation direction (rotates in the reverse direction) and starts to rise. At this time, cement milk is supplied from the storage tank 91 to the ground improvement machine 1 through the transport hose 92, and the supplied cement milk passes through the auger rod 41 and the internal flow paths 411 and 312 of the excavation agitation device 3 to excavate and agitate. It is discharged from the discharge port 313 at the tip (lower end) of the device 3 (shaft portion 31) into a hole (a columnar hole formed by excavation of the excavation stirring device 3).
このセメントミルクの吐出と掘削撹拌装置３の第二回転方向への回転とにより、穴の内部で掘削土とセメントミルクとが撹拌される。そして、地盤改良駆動部４がセメントミルクと掘削土との撹拌を行いつつ、掘削した穴の内部を上昇し又は上昇や下降が組み合わされた動きをした後、掘削撹拌装置３が地上に現れるまで、リーダーマスト２１に沿って上昇する。その後、掘削された円柱状の穴の内部で掘削土と撹拌されたセメントミルクが固まることで、地盤中において円柱状の造成体が形成される。 By discharging the cement milk and rotating the excavation stirring device 3 in the second rotation direction, the excavated soil and the cement milk are agitated inside the hole. Then, while the ground improvement drive unit 4 agitates the cement milk and the excavated soil, it moves up or down in the excavated hole in combination, and then until the excavation agitator 3 appears on the ground. , Ascend along the leader mast 21. After that, the excavated soil and the agitated cement milk solidify inside the excavated columnar hole to form a columnar structure in the ground.
以上の地盤改良機１では、掘削撹拌装置３において、複数の共回り防止翼３５のうちの一部の共回り防止翼（第一の共回り防止翼３５Ａ）と各掘削翼３２１（回転翼３２）との中心軸Ｃ方向の間隔（第一間隔）α１が、複数の共回り防止翼３５のうちの残りの共回り防止翼（第二の共回り防止翼３５Ｂ（平行部３５２Ｂ））と各掘削翼３２１（回転翼３２）との中心軸Ｃ方向の間隔（第二間隔）α２より大きい。このため、地盤の掘削や掘削土とセメントミルクとの撹拌等の際に、共回り防止翼３５の回転が抑えられた状態でオーガロッド４１の回転に伴って掘削翼３２１（回転翼３２）が回転することで共回り防止翼３５と掘削翼３２１（回転翼３２）とが相対回転したときに、共回り防止翼と掘削翼（回転翼）との間隔が全て第一間隔α１である掘削撹拌装置に比べ、掘削土等に混ざっている塊（例えば、粘土や石、いわゆるガラ等の塊）を共回り防止翼３５と掘削翼３２１（回転翼３２）との間に噛み込み難くなる。即ち、掘削土に混ざっている塊が第一間隔α１より小さければ、少なくとも第一の共回り防止翼３５Ａと掘削翼３２１（回転翼３２）との間での該塊の噛み込みが防がれる。 In the above-mentioned ground improvement machine 1, in the excavation stirring device 3, a part of the co-rotation prevention blades 35 (first co-rotation prevention blade 35A) and each excavation blade 321 (rotary blade 32) of the plurality of co-rotation prevention blades 35 are used. ) With the distance (first distance) α 1 in the central axis C direction with the remaining co-rotation prevention blades (second co-rotation prevention blade 35B (parallel portion 352B)) among the plurality of co-rotation prevention blades 35. The distance (second distance) α 2 in the central axis C direction from each drilling blade 321 (rotary blade 32) is larger. Therefore, when excavating the ground or stirring the excavated soil with cement milk, the excavation blade 321 (rotary blade 32) is rotated along with the rotation of the auger rod 41 in a state where the rotation of the co-rotation prevention blade 35 is suppressed. When the co-rotation prevention wing 35 and the excavation wing 321 (rotary wing 32) rotate relative to each other due to rotation, the distance between the co-rotation prevention wing and the excavation wing (rotary wing) is all the first distance α 1. Compared to the agitator, it becomes difficult for a lump mixed with excavated soil or the like (for example, a lump of clay or stone, so-called glass, etc.) to be caught between the co-rotation prevention blade 35 and the excavation blade 321 (rotary blade 32). That is, if the mass mixed in the excavated soil is smaller than the first interval α 1 , at least the biting of the mass between the first co-rotation prevention blade 35A and the excavation blade 321 (rotor blade 32) is prevented. Is done.
また、掘削撹拌装置３において、第二の共回り防止翼３５Ｂ（平行部３５２Ｂ）と、先端部３１ｂ側の第二の組３２Ａ２を構成する各撹拌翼３２２（回転翼３２）との中心軸Ｃ方向の間隔（第三間隔）α３は、第一の共回り防止翼３５Ａと、先端部３１ｂ側の第二の組３２Ａ２を構成する各撹拌翼３２２（回転翼３２）との中心軸Ｃ方向の間隔（第四間隔）α４より大きい。このため、地盤の掘削や掘削土とセメントミルクとの撹拌等の際に、共回り防止翼３５の回転が抑えられた状態でオーガロッド４１の回転に伴って撹拌翼３２２（回転翼３２）が回転することで共回り防止翼３５と撹拌翼３２２（回転翼３２）とが相対回転したときに、共回り防止翼と撹拌翼（回転翼）との間隔が全て第四間隔α４である掘削撹拌装置に比べ、掘削土に混ざっている塊（例えば、粘土や石、いわゆるガラ等の塊）を共回り防止翼３５と撹拌翼３２２（回転翼３２）との間に噛み込み難くなる。 Further, in the excavation stirring device 3, the central axis of the second co-rotation prevention blade 35B (parallel portion 352B) and each stirring blade 322 (rotary blade 32) constituting the second set 32A 2 on the tip portion 31b side. The distance (third distance) α 3 in the C direction is the central axis between the first co-rotation prevention blade 35A and each stirring blade 322 (rotary blade 32) constituting the second set 32A 2 on the tip end 31b side. C direction between larger (fourth distance) alpha 4. Therefore, when excavating the ground or stirring the excavated soil and cement milk, the stirring blade 322 (rotary blade 32) is rotated as the auger rod 41 rotates while the rotation of the co-rotation prevention blade 35 is suppressed. when the co-rotation preventing blades 35 by rotating which the stirring blades 322 (rotor blades 32) are relatively rotated, a 4 interval is every fourth distance α between the co-rotation preventing wing and stirring blade (rotating blade) drilling Compared with the stirring device, it becomes difficult for the mass mixed in the excavated soil (for example, a mass of clay, stone, so-called glass, etc.) to be caught between the co-rotation prevention blade 35 and the stirring blade 322 (rotary blade 32).
例えば、図５に示すように、第一間隔α１を通過した塊（例えば、粘土や石、いわゆるガラ等の塊）ｍが、掘削撹拌装置３（地盤改良駆動部４）の降下や、掘削翼３２１及び撹拌翼３２２の回転等による掘削土の移動等によって第三間隔α３の位置に移動すると、第三間隔α３を通過するため、この塊ｍの噛み込が生じない。このように、本実施形態の地盤改良機１（掘削撹拌装置３）では、一部の共回り防止翼３５と回転翼３２（掘削翼３２１、撹拌翼３２２）との間隔α１、α３を、他の共回り防止翼３５と回転翼３２（掘削翼３２１、撹拌翼３２２）との間隔α２、α４より広くすることにより、共回り防止翼３５と回転翼３２（掘削翼３２１、撹拌翼３２２）との各間隔が全て同じ（例えば、全てが間隔α２、α４）の掘削撹拌装置に比べて、掘削土に混ざっている塊ｍの噛み込みの可能性が抑えられる。 For example, as shown in FIG. 5, a mass (for example, a mass of clay, stone, so-called glass, etc.) m that has passed through the first interval α 1 descends the excavation stirring device 3 (ground improvement drive unit 4) or excavates. When the excavated soil is moved to the position of the third interval α 3 due to the movement of the excavated soil due to the rotation of the blade 321 and the stirring blade 322 or the like, the mass m is not bitten because it passes through the third interval α 3. As described above, in the ground improvement machine 1 (excavation stirring device 3) of the present embodiment, the distances α 1 and α 3 between some of the co-rotation prevention blades 35 and the rotary blades 32 (excavation blades 321 and stirring blades 322) are set. By making the distance between the other co-rotation prevention blade 35 and the rotary blade 32 (excavation blade 321, stirring blade 322) wider than α 2 and α 4 , the co-rotation prevention blade 35 and the rotary blade 32 (excavation blade 321, stirring blade 32) are made wider. Compared with the excavation agitator having the same interval with the blade 322) (for example, all the intervals α 2 and α 4 ), the possibility of the lump m mixed in the excavated soil being bitten is suppressed.
また、本実施形態の地盤改良機１では、掘削撹拌装置３において、延出板３３が掘削翼３２１の共回り防止翼３５側の端縁３２１１ｂから延び、この延出板３３は、延出方向の先端側の部位が掘削翼３２１の共回り防止翼３５に対する回転方向と反対側に変位するように弾性変形可能である。このように延出板３３が設けられることで相対回転する翼（掘削翼３２１、共回り防止翼３５）同士の中心軸Ｃ方向の間隔が小さくなり又は部分的に小さくなるため、掘削土がより細かく破砕される。しかも、延出板３３が弾性変形可能であるため、共回り防止翼３５と延出板３３とが塊ｍを噛み込みそうになっても、延出板３３が弾性変形することで（図６参照）前記噛み込みを防ぐことができる。 Further, in the ground improvement machine 1 of the present embodiment, in the excavation stirring device 3, the extension plate 33 extends from the end edge 3211b of the excavation blade 321 on the co-rotation prevention blade 35 side, and the extension plate 33 extends in the extension direction. The portion on the tip end side of the excavation blade 321 can be elastically deformed so as to be displaced in the direction opposite to the rotation direction with respect to the co-rotation prevention blade 35. By providing the extension plate 33 in this way, the distance between the blades (excavation blade 321 and the co-rotation prevention blade 35) that rotate relative to each other in the central axis C direction becomes smaller or partially smaller, so that the excavated soil becomes more compact. It is crushed into small pieces. Moreover, since the extension plate 33 can be elastically deformed, even if the co-rotation prevention blade 35 and the extension plate 33 are about to bite the lump m, the extension plate 33 is elastically deformed (FIG. 6). (See) The biting can be prevented.
尚、本発明の掘削撹拌装置、及び掘削撹拌装置を備える地盤改良機は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、ある実施形態の構成に他の実施形態の構成を追加することができ、また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることができる。さらに、ある実施形態の構成の一部を削除することができる。 The excavation agitation device of the present invention and the ground improvement machine provided with the excavation agitation device are not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the gist of the present invention. is there. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configurations of certain embodiments can be deleted.
上記実施形態の掘削撹拌装置３では、第一間隔α１が第二間隔α２より大きく、且つ、第三間隔α３が第四間隔α４より大きいが、この構成に限定されない。 In the excavation agitation device 3 of the above embodiment, the first interval α 1 is larger than the second interval α 2 and the third interval α 3 is larger than the fourth interval α 4, but the configuration is not limited to this.
例えば、図７に示すように、第一間隔α１が第二間隔α２より大きく、且つ、共回り防止翼３５と撹拌翼３２２との各間隔α５が同じ構成でもよい。また、図８に示すように、共回り防止翼３５と掘削翼３２１との各間隔α６が同じで、且つ、第三間隔α３が第四間隔α４より大きい構成であってもよい。 For example, as shown in FIG. 7, the first interval α 1 may be larger than the second interval α 2 , and the intervals α 5 between the co-rotation prevention blade 35 and the stirring blade 322 may be the same. Further, as shown in FIG. 8, the co-rotation prevention blade 35 and the excavation blade 321 may have the same distance α 6 and the third distance α 3 may be larger than the fourth distance α 4.
上記実施形態の掘削撹拌装置３では、第二の共回り防止翼３５Ｂは、途中で屈曲する帯板状であるが、この構成に限定されない。図９に示すように、複数の共回り防止翼３５Ｃのそれぞれが、中心軸Ｃと直交する方向に真っ直ぐ延びる帯状でもよい。即ち、複数の共回り防止翼３５Ｃのうちの少なくとも一部が、ボス部３４における中心軸Ｃ方向の異なる位置から延びる構成でもよい。 In the excavation stirring device 3 of the above embodiment, the second co-rotation prevention blade 35B has a strip-like shape that bends in the middle, but is not limited to this configuration. As shown in FIG. 9, each of the plurality of co-rotation prevention blades 35C may have a strip shape extending straight in a direction orthogonal to the central axis C. That is, at least a part of the plurality of co-rotation prevention blades 35C may extend from different positions in the central axis C direction on the boss portion 34.
また、上記実施形態の掘削撹拌装置３では、共回り防止翼３５は、厚さが一定の帯板状であるが、この構成に限定されない。共回り防止翼３５Ｃは、先端部３５５（詳しくは、中心軸Ｃと直交する方向において、少なくとも掘削翼３２１の先端及び撹拌翼３２２の先端より径方向外側に突出する部位）が、基部側の部位（軸部３１側の部位）３５６より薄くてもよい。例えば、図９に示す例では、共回り防止翼３５Ｃの先端部３５５の厚みが２ｍｍ〜４ｍｍであり、他の部位３５６の厚みが４５ｍｍである。かかる構成によれば、地盤の掘削の際に、共回り防止翼３５Ｃの先端部３５５が穴（掘削した穴）の周壁により食い込み易くなる。 Further, in the excavation stirring device 3 of the above embodiment, the co-rotation prevention blade 35 has a strip-like shape having a constant thickness, but is not limited to this configuration. The co-rotation prevention blade 35C has a tip portion 355 (specifically, a portion projecting radially outward from at least the tip of the excavation blade 321 and the tip of the stirring blade 322 in the direction orthogonal to the central axis C) on the base side. (Part on the shaft portion 31 side) It may be thinner than 356. For example, in the example shown in FIG. 9, the thickness of the tip portion 355 of the co-rotation prevention blade 35C is 2 mm to 4 mm, and the thickness of the other portion 356 is 45 mm. According to such a configuration, when excavating the ground, the tip portion 355 of the co-rotation prevention blade 35C is likely to bite into the peripheral wall of the hole (excavated hole).
上記実施形態の掘削撹拌装置３では、延出板３３は、掘削翼３２１から延びているが、この構成に限定されない。例えば図１０に示すように、延出板３３は、共回り防止翼３５から延びていてもよい。この場合、延出板３３は、共回り防止翼３５における中心軸Ｃ方向の一方側（図１０における下側）の端縁から延びていてもよく、共回り防止翼３５における中心軸Ｃ方向の他方側（図１０における上側）の端縁から延びていてもよい。また、延出板３３は、共回り防止翼３５における中心軸Ｃ方向の両側の端縁からそれぞれ延びていてもよい。また、延出板３３は、撹拌翼３２２から延びていてもよい。さらに、掘削撹拌装置３は、延出板３３の無い構成でもよい。 In the excavation stirring device 3 of the above embodiment, the extension plate 33 extends from the excavation blade 321 but is not limited to this configuration. For example, as shown in FIG. 10, the extension plate 33 may extend from the co-rotation prevention blade 35. In this case, the extension plate 33 may extend from one end edge of the co-rotation prevention blade 35 in the central axis C direction (lower side in FIG. 10), and may extend from the edge of the co-rotation prevention blade 35 in the central axis C direction. It may extend from the edge on the other side (upper side in FIG. 10). Further, the extension plate 33 may extend from both end edges of the co-rotation prevention blade 35 in the central axis C direction. Further, the extension plate 33 may extend from the stirring blade 322. Further, the excavation agitation device 3 may be configured without the extension plate 33.
上記実施形態の掘削撹拌装置３は、オーガロッド４１に着脱可能に連結されているが、この構成に限定されない。例えば、掘削撹拌装置３は、オーガロッド４１と一体であってもよい。 The excavation stirring device 3 of the above embodiment is detachably connected to the auger rod 41, but is not limited to this configuration. For example, the excavation agitation device 3 may be integrated with the auger rod 41.
１…地盤改良機、２…ベースマシン、２１…リーダーマスト、３…掘削撹拌装置、３１…軸部、３１ａ…基端部、３１ｂ…先端部、３１１…ジョイント部、３１２…内部流路、３１３…吐出口、３１４…鍔部、３２…回転翼、３２Ａ…回転翼の組、３２Ａ１…第一の組、３２Ａ２…第二の組、３２１…掘削翼（回転翼）、３２１１…掘削翼本体、３２１１ａ…中心軸方向における一方側の端縁、３２１１ｂ…中心軸方向における他方側の端縁、３２１１ｆ…表面、３２１１ｒ…裏面、３２１２…補強部、３２１３…掘削ビット、３２２…撹拌翼（回転翼）、３２２１…撹拌翼本体、３２２２…補強部、３３…延出板、３４…ボス部、３４１…外殻部、３４２…摺接部、３５、３５Ｃ…共回り防止翼、３５Ａ…第一の共回り防止翼、３５Ｂ…第二の共回り防止翼、３５１Ｂ…傾斜部、３５２Ｂ…平行部、３５５…先端部、３６…先端ビット部、３６１…掘削ビット、４…地盤改良駆動部、４１…オーガロッド、４１１…内部流路、４２…回転駆動装置、９１…貯留槽、９２…輸送ホース、９３…ポンプ、５００…掘削撹拌装置、５０１…回転翼、５０２…共回り防止翼、Ｃ、Ｃ１、Ｃ２、Ｃ５…中心軸、ｍ…塊、α１…第一間隔、α２…第二間隔、α３…第三間隔、α４…第四間隔、α５、α６…間隔 1 ... Ground improvement machine, 2 ... Base machine, 21 ... Leader mast, 3 ... Excavation stirrer, 31 ... Shaft part, 31a ... Base end part, 31b ... Tip part, 311 ... Joint part, 312 ... Internal flow path, 313 ... Discharge port, 314 ... Collar, 32 ... Rotating wing, 32A ... Rotating wing set, 32A 1 ... First set, 32A 2 ... Second set, 321 ... Excavation wing (rotary wing), 3211 ... Excavation wing Main body, 3211a ... One end edge in the central axis direction, 3211b ... The other end edge in the central axis direction, 3211f ... Front surface, 3211r ... Back surface, 3212 ... Reinforcing part, 3213 ... Excavation bit, 322 ... Stirring blade (rotation) Wings), 3221 ... Stirring blade body, 3222 ... Reinforcing part, 33 ... Extension plate, 34 ... Boss part, 341 ... Outer shell part, 342 ... Sliding contact part, 35, 35C ... Co-rotation prevention blade, 35A ... First Co-rotation prevention blade, 35B ... Second co-rotation prevention blade, 351B ... Inclined part, 352B ... Parallel part, 355 ... Tip part, 36 ... Tip bit part, 361 ... Excavation bit, 4 ... Ground improvement drive part, 41 ... Auger rod, 411 ... Internal flow path, 42 ... Rotation drive, 91 ... Storage tank, 92 ... Transport hose, 93 ... Pump, 500 ... Excavation stirrer, 501 ... Rotating blade, 502 ... Co-rotation prevention blade, C, C 1 , C 2 , C 5 ... Central axis, m ... Mass, α 1 ... First interval, α 2 ... Second interval, α 3 ... Third interval, α 4 ... Fourth interval, α 5 , α 6 ... interval
Claims (2)
前記オーガロッドの回転に伴って前記中心軸周りに回転する複数の回転翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ回転方向に間隔をあけて配置される複数の回転翼と、
中心軸方向における前記複数の回転翼と隣り合った位置において前記オーガロッドに対して回転自在に配置されて掘削された土壌の前記複数の回転翼との共回りを防止する複数の共回り防止翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ前記回転方向に間隔をあけて配置される複数の共回り防止翼と、を備え、
各回転翼における前記中心軸方向の前記共回り防止翼側の端縁の位置は、それぞれ同じであり、
前記複数の共回り防止翼のうちの一部の共回り防止翼である第一の共回り防止翼と前記各回転翼との前記中心軸方向の間隔は、前記複数の共回り防止翼のうちの残りの共回り防止翼である第二の共回り防止翼と前記各回転翼との前記中心軸方向の間隔より大きく、
前記各回転翼は、相対回転したときに前記共回り防止翼と接触しない範囲で該共回り防止翼側の端縁から延出する延出板をそれぞれ有し、
各延出板は、延出方向の先端側の部位が前記回転翼の前記共回り防止翼に対する回転方向と反対側に変位するように弾性変形可能であり、
前記延出板の前記各回転翼における前記中心軸と直交する方向の位置は、前記中心軸方向の同じ位置で前記各回転翼が前記中心軸周りに回転したときに、一つの回転翼に配置された前記延出板が通過する領域が他の回転翼に配置された前記延出板が通過する領域と重ならないように設定されている、掘削撹拌装置。 An excavation agitator that is attached to the end of an auger rod of a ground improvement machine equipped with an auger rod that extends along the central axis and is rotatable around the central axis to excavate soil.
A plurality of rotor blades that rotate around the central axis with the rotation of the auger rod, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction. With wings
A plurality of co-rotation prevention blades for preventing co-rotation of excavated soil with the plurality of rotor blades rotatably arranged with respect to the auger rod at a position adjacent to the plurality of rotor blades in the central axis direction. A plurality of co-rotation prevention blades, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction, are provided.
The positions of the end edges on the co-rotation prevention blade side in the central axis direction of each rotor are the same.
The distance between the first co-rotation prevention blade, which is a part of the co-rotation prevention blades of the plurality of co-rotation prevention blades, and each of the rotary blades in the central axis direction is the distance between the co-rotation prevention blades. the second co-rotation preventing blade and the rather larger than distance between the central axis direction of each rotor blade is the remaining co-rotation prevention wings,
Each rotor has an extension plate that extends from the end edge on the co-rotation prevention blade side within a range that does not come into contact with the co-rotation prevention blade when relatively rotated.
Each extension plate can be elastically deformed so that the portion on the tip side in the extension direction is displaced in the direction opposite to the rotation direction of the rotary blade with respect to the co-rotation prevention blade.
The position of the extension plate in each rotor in the direction orthogonal to the central axis is arranged in one rotor when each rotor rotates around the central axis at the same position in the central axis direction. An excavation agitator in which a region through which the extended plate is passed is set so as not to overlap with a region through which the extended plate is arranged on another rotor.
前記オーガロッドの端部に配置されて土壌を掘削する掘削撹拌装置と、を備え、
前記掘削撹拌装置は、
前記オーガロッドの回転に伴って前記中心軸周りに回転する複数の回転翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ回転方向に間隔をあけて配置される複数の回転翼と、
中心軸方向における前記複数の回転翼と隣り合った位置において前記オーガロッドに対して回転自在に配置されることで掘削された土壌の前記複数の回転翼との共回りを防止する複数の共回り防止翼であって、それぞれが前記中心軸と直交する方向に沿って延び且つ前記回転方向に間隔をあけて配置される複数の共回り防止翼と、を有し、
各回転翼における前記中心軸方向の前記共回り防止翼側の端縁の位置は、それぞれ同じであり、
前記複数の共回り防止翼のうちの一部の共回り防止翼である第一の共回り防止翼と前記各回転翼との前記中心軸方向の間隔は、前記複数の共回り防止翼のうちの残りの共回り防止翼である第二の共回り防止翼と前記各回転翼との前記中心軸方向の間隔より大きく、
前記各回転翼は、相対回転したときに前記共回り防止翼と接触しない範囲で該共回り防止翼側の端縁から延出する延出板をそれぞれ有し、
各延出板は、延出方向の先端側の部位が前記回転翼の前記共回り防止翼に対する回転方向と反対側に変位するように弾性変形可能であり、
前記延出板の前記各回転翼における前記中心軸と直交する方向の位置は、前記中心軸方向の同じ位置で前記各回転翼が前記中心軸周りに回転したときに、一つの回転翼に配置された前記延出板が通過する領域が他の回転翼に配置された前記延出板が通過する領域と重ならないように設定されている、地盤改良機。 An auger rod that extends along the central axis and can rotate around the central axis,
An excavation agitator located at the end of the auger rod to excavate the soil.
The excavation agitator
A plurality of rotor blades that rotate around the central axis with the rotation of the auger rod, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction. With wings
There it in a position adjacent to the plurality of rotor blades in the central axis direction of the plurality of preventing co-rotation of the plurality of rotor blades of the soil that is excavated by being rotatably arranged relative to the auger rod It has a plurality of co-rotation prevention blades, each of which extends along a direction orthogonal to the central axis and is arranged at intervals in the rotation direction.
The positions of the end edges on the co-rotation prevention blade side in the central axis direction of each rotor are the same.
The distance between the first co-rotation prevention blade, which is a part of the co-rotation prevention blades of the plurality of co-rotation prevention blades, and each of the rotary blades in the central axis direction is the distance between the co-rotation prevention blades. the second co-rotation preventing blade and the rather larger than distance between the central axis direction of each rotor blade is the remaining co-rotation prevention wings,
Each rotor has an extension plate that extends from the end edge on the co-rotation prevention blade side within a range that does not come into contact with the co-rotation prevention blade when relatively rotated.
Each extension plate can be elastically deformed so that the portion on the tip side in the extension direction is displaced in the direction opposite to the rotation direction of the rotary blade with respect to the co-rotation prevention blade.
The position of the extension plate in each rotor in the direction orthogonal to the central axis is arranged in one rotor when each rotor rotates around the central axis at the same position in the central axis direction. A ground improvement machine in which the area through which the extended plate is passed is set so as not to overlap with the area through which the extended plate is arranged on another rotor.
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