JP2021063396A - Method and device for correcting hole bending in rotary drilling construction - Google Patents

Method and device for correcting hole bending in rotary drilling construction Download PDF

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JP2021063396A
JP2021063396A JP2019189577A JP2019189577A JP2021063396A JP 2021063396 A JP2021063396 A JP 2021063396A JP 2019189577 A JP2019189577 A JP 2019189577A JP 2019189577 A JP2019189577 A JP 2019189577A JP 2021063396 A JP2021063396 A JP 2021063396A
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drilling
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drilling machine
ground
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JP7370212B2 (en
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有史 足立
Yuji Adachi
有史 足立
ホンソン グエン
Son Nguyen Hong
ホンソン グエン
績 荻原
Isao Ogiwara
績 荻原
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Hazama Ando Corp
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  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
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Abstract

To easily and quickly correct a drilled hole to a normal drilling position and a drilling direction when a hole drilled by a drilling machine at a tip of an earth auger is bent.SOLUTION: In this method and device, there are provided protrusions C1 only at a specified position with respect to a drilling direction and in one direction with respect to a rotation direction, in a peripheral portion of a drilling machine B. When a hole becomes out of a normal drilling position and direction to be bent; the drilling machine B is returned to a position where the hole begins to be bent, the protrusion C1 is forced into a face opposite to the direction in which the hole is bent, the ground is loosened by oscillating with normal and reverse rotation of the drilling machine B, and the drilling machine B is corrected to the normal drilling position and direction with respect to the ground.SELECTED DRAWING: Figure 1

Description

本発明は、地盤の改良や山留め壁の親杭、基礎杭の打ち込みの工事などで、アースオーガを用いて地盤を削孔する回転削孔施工において、アースオーガ先端の削孔機械が地盤の削孔中に所定の軌道をずれて、削孔した孔が正規の削孔位置、削孔方向から外れて曲がった場合に、孔を正規の削孔位置、削孔方向に修正するための、回転削孔施工における孔曲り修正方法及び装置に関する。 According to the present invention, in rotary drilling work in which the ground is drilled using an earth auger in the construction of improving the ground, driving the main pile of the retaining wall, and the foundation pile, the drilling machine at the tip of the earth auger drills the ground. Rotation to correct the hole to the regular drilling position and drilling direction when the drilled hole deviates from the regular drilling position and drilling direction in the hole and bends. The present invention relates to a method and an apparatus for correcting hole bending in drilling work.

地盤の改良を行うための工法として深層混合処理工法が知られている。この工法では、例えば特許文献１に記載されているように、原地盤に対し、撹拌翼を有する掘削撹拌装置を先端に取り付けたアースオーガを掘進させながら（回転削孔施工）、原地盤にセメントミルク等の地盤固化材を注入、撹拌することにより、原地盤に柱状の地盤改良体を形成する。 The deep mixing treatment method is known as a method for improving the ground. In this construction method, for example, as described in Patent Document 1, cement is formed on the original ground while digging an earth auger having an excavation agitator having a stirring blade attached to the tip of the original ground (rotary drilling work). By injecting and stirring a ground solidifying material such as milk, a columnar ground improvement body is formed on the original ground.

山留め壁の親杭又は基礎杭を地中に打ち込む工法として、杭を圧入する工法が周知である。この工法では、例えば特許文献２に記載されているように、スクリュを先端に取り付けたアースオーガで地盤又は土砂を掘削しながら（回転削孔施工）、杭を地中に圧入する。 As a method of driving the main pile or foundation pile of the retaining wall into the ground, the method of press-fitting the pile is well known. In this construction method, for example, as described in Patent Document 2, a pile is press-fitted into the ground while excavating the ground or earth and sand with an earth auger having a screw attached to the tip (rotary drilling work).

特開２００９−２２８２４６号公報JP-A-2009-228246 実登２５１５３７８号Actual climb No. 2515378

しかしながら、このような地盤の改良や杭の打ち込みのための回転削孔施工のように、アースオーガ（のロッド）の先端に掘削撹拌装置やスクリュなどの削孔機械を取り付けて、削孔機械を地盤に対して回転下降させて削孔機械で地盤を削孔する場合、地盤の固さなどの地盤の不均質性や石、岩などの障害物、施工機械の姿勢制御の影響などを受けて、削孔機械の先端位置が所定の軌道からずれて孔の正規の削孔位置や削孔方向が曲がることがあり、孔が正規の削孔位置から曲がると、地盤改良体や杭を地盤の所定の設計位置に設置できず、出来形を満足できない、また、山留め壁の親杭の打ち込みでは、孔の正規の削孔位置や削孔方向が曲がると、親杭がずれて隙間が生じ、土砂や地下水が流出する恐れがある、という問題がある。 However, as in the case of rotary drilling for ground improvement and pile driving, a drilling machine such as an excavation stirrer or screw is attached to the tip of the earth auger (rod) to make the drilling machine. When the ground is rotated and lowered with respect to the ground and the ground is drilled with a drilling machine, it is affected by the inhomogeneity of the ground such as the hardness of the ground, obstacles such as stones and rocks, and the attitude control of the construction machine. , The tip position of the drilling machine may deviate from the predetermined trajectory and the regular drilling position or drilling direction of the hole may bend. It cannot be installed in the specified design position, and the finished shape cannot be satisfied. Also, when driving the main pile of the retaining wall, if the regular drilling position or drilling direction of the hole is bent, the main pile will shift and a gap will be created. There is a problem that earth and sand and groundwater may flow out.

本発明は、このような従来の問題を解決するものであり、地盤の改良や山留め壁の親杭、基礎杭の打ち込み工事などで、アースオーガを用いて地盤を削孔する回転削孔施工を対象に、アースオーガ先端の削孔機械が地盤の削孔中に所定の軌道をずれて孔の正規の削孔位置や削孔方向が曲がった場合に、削孔した孔を正規の削孔位置、削孔方向に容易かつ速やかに修正して、回転削孔施工の施工精度の向上を図ることのできる回転削孔施工における孔曲り修正方法及び装置を提供すること、を目的とする。 The present invention solves such a conventional problem, and performs rotary drilling work for drilling the ground using an earth auger in the ground improvement, the driving work of the main pile of the retaining wall, the foundation pile, and the like. For the target, when the drilling machine at the tip of the earth auger deviates from the predetermined trajectory during drilling of the ground and the regular drilling position or drilling direction of the hole is bent, the drilled hole is replaced with the regular drilling position. It is an object of the present invention to provide a method and an apparatus for correcting hole bending in rotary drilling work, which can easily and quickly correct the hole in the drilling direction to improve the construction accuracy of rotary drilling work.

上記目的を達成するために、本発明は、
アースオーガの先端に各種の削孔機械を取り付けて、前記削孔機械を地盤に対して回転下降させて地盤を削孔する回転削孔施工において、前記削孔機械が地盤の削孔中に所定の軌道をずれて、孔の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔を正規の削孔位置、削孔方向に修正する回転削孔施工における孔曲り修正方法であって、
前記削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械により地盤に削孔される孔の内周面に対して突入可能に突起を設けておき、
前記削孔機械による地盤の削孔中、前記削孔機械が正規の軌道を外れて、削孔した孔が正規の削孔位置、削孔方向から外れて曲がったときに、前記削孔機械を前記削孔した孔が前記正規の削孔位置、削孔方向から外れて曲がり始めた位置まで戻し、前記削孔した孔の内周面において前記削孔した孔が前記正規の削孔位置、削孔方向から外れて曲がった方向とは反対の面をほぐし施工面として、前記突起を前記ほぐし施工面に突入させて前記削孔機械の正逆回転により揺動させることにより前記突起で前記ほぐし施工面をほぐし、前記削孔機械を地盤に対する正規の削孔位置、削孔方向に修正する、
ことを要旨とする。
この場合、突起は削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械の外周部から出没して削孔した孔の内周面に対して突入離脱可能に設けることが好ましい。 In order to achieve the above object, the present invention
In rotary drilling work in which various drilling machines are attached to the tip of an earth auger and the drilling machine is rotated and lowered with respect to the ground to drill holes in the ground, the drilling machine is specified during drilling in the ground. When the regular drilling position and drilling direction of the hole are bent, the drilled hole is corrected to the regular drilling position and drilling direction. There,
It is possible to plunge into the inner peripheral surface of a hole drilled in the ground by the drilling machine only at a fixed position with respect to the drilling direction and in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine. With a protrusion on the
During drilling of the ground by the drilling machine, when the drilling machine deviates from the regular track and the drilled hole deviates from the regular drilling position and drilling direction and bends, the drilling machine is operated. The drilled hole is returned to the position where the drilled hole deviates from the regular drilling position and the drilling direction and begins to bend, and the drilled hole is the regular drilling position and drilling on the inner peripheral surface of the drilled hole. The surface opposite to the bending direction deviating from the hole direction is used as the unraveling construction surface, and the protrusion is rushed into the unraveling construction surface and swung by the forward and reverse rotation of the drilling machine to perform the unraveling work with the protrusion. Loosen the surface and correct the drilling machine to the regular drilling position and drilling direction with respect to the ground.
The gist is that.
In this case, the protrusions appear in the outer peripheral portion of the drilling machine at a fixed position with respect to the drilling direction and only in one direction with respect to the rotational direction. It is preferable to provide the peripheral surface so that it can be rushed and detached.

上記目的を達成するために、本発明は、
アースオーガの先端に各種の削孔機械を取り付けて、前記削孔機械を地盤に対して回転下降させて地盤を削孔する回転削孔施工において、前記削孔機械が地盤の削孔中に所定の軌道をずれて、孔の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔を正規の削孔位置、削孔方向に修正する回転削孔施工における孔曲り修正装置であって、
前記削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械により地盤に削孔される孔の内周面に突入可能に突起が突設され、前記突起は前記削孔機械の正逆回転により揺動可能に駆動される、
ことを要旨とする。
また、この孔曲り修正装置は、次のように具体化される。
（１）アースオーガはロッド駆動部により回転駆動されるロッドを備え、前記ロッドは、内軸と、前記内軸の外側に相互に相対回転可能に装着される外軸とを有し、削孔機械は、前記内軸又は前記外軸の外周部に前記内軸又は前記外軸と一体回転可能に突設される撹拌歯と、前記内軸の外周部に前記内軸と一体回転可能に突設される水平撹拌翼と、前記外軸の外周部に前記外軸と一体回転可能に突設される水平撹拌翼とを備え、突起は、前記撹拌歯又は前記内軸若しくは前記外軸の前記水平撹拌翼のいずれかでその外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される。
（２）アースオーガはロッド駆動部により回転駆動されるロッドを備え、前記ロッドは、内軸と、前記内軸の外側に相互に相対回転可能に装着される外軸とを有し、削孔機械は、前記内軸又は前記外軸の外周部に前記内軸又は前記外軸と一体回転可能に突設される撹拌歯と、前記内軸の外周部に前記内軸と一体回転可能に突設される複数の水平撹拌翼と、前記外軸の外周部に前記外軸と一体回転可能に突設される複数の水平撹拌翼と、前記内軸若しくは前記外軸の前記各水平撹拌翼の端部間に連結される複数の垂直撹拌翼とを備え、突起は、前記撹拌歯又は前記内軸若しくは前記外軸の前記垂直撹拌翼のいずれかでその外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される。
（３）アースオーガはロッド駆動部により回転駆動されるロッドを備え、削孔機械は前記ロッドの先端部に設けられるスクリュからなり、突起は、前記スクリュの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される。
（４）突起は削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械の外周部から出没して削孔した孔の内周面に対して突入離脱可能に設けられる。 In order to achieve the above object, the present invention
In rotary drilling work in which various drilling machines are attached to the tip of an earth auger and the drilling machine is rotated and lowered with respect to the ground to drill holes in the ground, the drilling machine is specified during drilling in the ground. With a hole bending correction device in rotary drilling construction that corrects the drilled hole in the regular drilling position and drilling direction when the regular drilling position and drilling direction of the hole deviates from the trajectory of There,
A protrusion that can enter the inner peripheral surface of a hole drilled in the ground by the drilling machine only at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine. Is projected, and the protrusion is oscillatingly driven by the forward and reverse rotation of the drilling machine.
The gist is that.
Further, this hole bending correction device is embodied as follows.
(1) The earth auger includes a rod that is rotationally driven by a rod drive unit, and the rod has an inner shaft and an outer shaft that is mounted on the outside of the inner shaft so as to be relatively rotatable with respect to each other. The machine has a stirring tooth projecting on the inner shaft or the outer peripheral portion of the outer shaft so as to be integrally rotatable with the inner shaft or the outer shaft, and a stirring tooth projecting on the outer peripheral portion of the inner shaft so as to be integrally rotatable with the inner shaft. A horizontal stirring blade to be provided and a horizontal stirring blade rotatably projecting from the outer peripheral portion of the outer shaft so as to be integrally rotatable with the outer shaft are provided, and the protrusion is the stirring tooth or the inner shaft or the outer shaft. One of the horizontal stirring blades is projected at a fixed position in the drilling direction and in only one direction with respect to the rotation direction on the outer peripheral portion thereof.
(2) The earth auger includes a rod that is rotationally driven by a rod drive unit, and the rod has an inner shaft and an outer shaft that is mounted on the outside of the inner shaft so as to be relatively rotatable with respect to each other. The machine has a stirring tooth projecting on the inner shaft or the outer peripheral portion of the outer shaft so as to be integrally rotatable with the inner shaft or the outer shaft, and a stirring tooth projecting on the outer peripheral portion of the inner shaft so as to be integrally rotatable with the inner shaft. A plurality of horizontal stirring blades to be provided, a plurality of horizontal stirring blades rotatably projecting from the outer peripheral portion of the outer shaft integrally with the outer shaft, and the horizontal stirring blades of the inner shaft or the outer shaft. It is provided with a plurality of vertical stirring blades connected between the ends, and the protrusions are constant with respect to the drilling direction at the outer peripheral portion of either the stirring teeth or the vertical stirring blades of the inner shaft or the outer shaft. It is projected at the position of and only in one direction with respect to the rotation direction.
(3) The earth auger includes a rod that is rotationally driven by a rod drive unit, the drilling machine consists of a screw provided at the tip of the rod, and the protrusion is constant with respect to the drilling direction at the outer peripheral portion of the screw. It is projected at the position of and only in one direction with respect to the rotation direction.
(4) The protrusions appear in the outer peripheral portion of the drilling machine at a fixed position with respect to the drilling direction and only in one direction with respect to the rotational direction. It is provided so that it can be rushed in and out of the peripheral surface.

本発明の回転削孔施工における孔曲り修正方法及び装置によれば、地盤の改良、山留め壁の親杭や基礎杭の打ち込みなどの工事で、アースオーガの先端に各種の削孔機械を取り付けて、削孔機械を地盤に対して回転下降させて地盤を削孔する回転削孔施工において、削孔機械が地盤の削孔中に所定の軌道をずれて、孔の正規の削孔位置、削孔方向が曲がった場合に、削孔機械を削孔した孔が正規の削孔位置、削孔方向から外れて曲がり始めた位置まで戻し、削孔した孔の内周面において削孔した孔が正規の削孔位置、削孔方向から外れて曲がった方向とは反対の面をほぐし施工面として、削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設させた突起をほぐし施工面に突入させて削孔機械の正逆回転により揺動させることにより、突起でほぐし施工面をほぐし、削孔機械の地盤に対する正規の削孔位置、削孔方向を修正するようにしたので、削孔した孔を正規の削孔位置、削孔方向に容易かつ速やかに修正することができ、回転削孔施工の施工精度の向上を図ることができる、という本発明独自の格別な効果を奏する。 According to the hole bending correction method and device in the rotary drilling construction of the present invention, various drilling machines are attached to the tip of the earth auger in the construction such as ground improvement, driving of the main pile and foundation pile of the retaining wall. In rotary drilling construction in which a drilling machine is rotated and lowered with respect to the ground to drill a hole, the drilling machine deviates from a predetermined trajectory during drilling of the ground, and the regular drilling position and drilling of the hole are performed. When the hole direction is bent, the hole drilled by the drilling machine is returned to the normal drilling position, the position where it deviates from the drilling direction and begins to bend, and the drilled hole is formed on the inner peripheral surface of the drilled hole. The regular drilling position, the surface opposite to the curved direction deviating from the drilling direction is used as the work surface, and the outer peripheral part of the drilling machine is at a fixed position with respect to the drilling direction and one with respect to the rotation direction. By loosening the protrusions that protrude only in the direction and plunging them into the construction surface and swinging them by the forward and reverse rotation of the drilling machine, the protrusions loosen the construction surface, and the regular drilling position of the drilling machine with respect to the ground, Since the drilling direction is corrected, the drilled hole can be easily and quickly corrected in the regular drilling position and drilling direction, and the construction accuracy of rotary drilling can be improved. , Which is a special effect unique to the present invention.

本発明の一実施の形態における回転削孔施工における孔曲り修正方法及び装置のイメージを示す図（（ａ１）は施工開始の状態を示す図（ａ２）は施工に用いる削孔機械及び本装置の突起を平面的に示す図（ｂ１）は施工開始後、削孔中に、孔の正規の削孔位置、削孔方向が曲がった場合で、孔曲りを修正する状態を示す図（ｂ２）は施工に用いる削孔機械及び本装置の突起を平面的に示す図）The figure which shows the image of the hole bending correction method and the apparatus in the rotary drilling construction in one Embodiment of this invention ((a1) shows the state of the construction start (a2) is the drilling machine used for construction, and this apparatus The diagram (b1) showing the protrusions in a plane shows the state in which the regular drilling position and the drilling direction of the hole are bent during the drilling after the start of construction, and the diagram (b2) showing the state of correcting the hole bending is shown. A plan showing the drilling machine used for construction and the protrusions of this device) 同方法及び同装置に用いる削孔機械の一例を示す図The figure which shows an example of the drilling machine used for the same method and the same device 深層混合処理工法での回転削孔施工における本方法及び本装置の適用例を示す図The figure which shows the application example of this method and this apparatus in rotary drilling construction by a deep-layer mixing processing method.

次に、この発明を実施するための形態について図を用いて説明する。図１（ａ１）、（ｂ１）に回転削孔施工における孔曲り修正方法のイメージを示している。図１（ａ２）、（ｂ２）にこの孔曲り修正法方法に用いる削孔機械と削孔機械に取り付ける突起のイメージを平面的に示している。
図１（ａ１）に示すように、この孔曲り修正方法（以下、本方法という。）は、地盤の改良、山留め壁の親杭や基礎杭の打ち込みなどの工事で、アースオーガＡ（のロッド５の）の先端に各種の削孔機械Ｂを取り付けて、削孔機械Ｂを地盤Ｇに対して回転下降させて地盤Ｇを削孔する回転削孔施工において、図１（ｂ１）に示すように、削孔機械Ｂが地盤Ｇの削孔中に所定の軌道をずれて、孔Ｇ１の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔Ｇ１を正規の削孔位置、削孔方向に修正するもので、本方法では、図１（ａ２）、（ｂ２）に示すように、特に、削孔機械Ｂの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、削孔機械Ｂにより地盤Ｇに削孔される孔Ｇ１の内周面に対して突入可能に突起Ｃ１を設けておき、削孔機械Ｂによる地盤の削孔中、削孔機械Ｂが正規の軌道を外れて、削孔した孔Ｇが正規の削孔位置、削孔方向から外れて曲がったときに、削孔機械Ｂを削孔した孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がり始めた位置まで戻し、削孔した孔Ｇ１の内周面において削孔した孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がった方向とは反対の面をほぐし施工面Ｇ２として、突起Ｃ１をほぐし施工面Ｇ２に突入させて削孔機械Ｂの正逆回転により揺動させることにより突起Ｃ１でほぐし施工面Ｂ２をほぐし、削孔機械Ｂの地盤Ｇに対する正規の削孔位置、削孔方向を修正する。 Next, a mode for carrying out the present invention will be described with reference to the drawings. FIGS. 1 (a1) and 1 (b1) show images of a hole bending correction method in rotary drilling construction. FIGS. 1 (a2) and 1 (b2) show a planar image of the drilling machine used in this hole bending correction method and the protrusions attached to the drilling machine.
As shown in FIG. 1 (a1), this hole bending correction method (hereinafter referred to as this method) is a construction work such as ground improvement, driving of a main pile or a foundation pile of a retaining wall, and a rod of Earth Auger A (the rod). As shown in FIG. 1 (b1), in a rotary drilling operation in which various drilling machines B are attached to the tip of (5) and the drilling machine B is rotationally lowered with respect to the ground G to drill the ground G. In addition, when the drilling machine B deviates from a predetermined trajectory during drilling of the ground G and the regular drilling position and drilling direction of the hole G1 are bent, the drilled hole G1 is moved to the regular drilling position. In this method, as shown in FIGS. 1 (a2) and 1 (b2), in particular, the outer peripheral portion of the drilling machine B rotates at a constant position with respect to the drilling direction. A protrusion C1 is provided so as to be able to enter into the inner peripheral surface of the hole G1 to be drilled in the ground G by the drilling machine B only in one direction with respect to the direction, and the drilling machine B is drilling the ground. When the drilling machine B deviates from the regular track and the drilled hole G deviates from the regular drilling position and the drilling direction and bends, the hole G1 drilled in the drilling machine B is the regular drilling. Return to the hole position and the position where it started to bend away from the drilling direction, and the hole G1 drilled on the inner peripheral surface of the drilled hole G1 is opposite to the regular drilling position and the direction of bending away from the drilling direction. The surface of the drilling machine B is loosened by the protrusion C1 and the ground of the drilling machine B is loosened by causing the protrusion C1 to plunge into the loosening construction surface G2 and swinging by the forward and reverse rotation of the drilling machine B. Correct the regular drilling position and drilling direction with respect to G.

本方法による施工手順をさらに具体的に説明する。
（ステップ１）
削孔機械Ｂの外周部にあらかじめ孔曲り修正専用の突起Ｃ１を設置しておく。この場合、図１（ａ２）、（ｂ２）に示すように、突起Ｃ１を削孔機械Ｂの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設させるが、この突起Ｃ１は、所定の長さに形成し、削孔機械Ｂの外周部に溶接などにより固定設置して、削孔した孔Ｇ１の内周面に対して突入可能にしてもよく、また、削孔機械Ｂの外周部から出没可能に取り付け、例えば油圧駆動などにより駆動させるようにして、削孔した孔Ｇ１の内周面に対して突入離脱可能に設けてもよい。なお、この突起Ｃ１は削孔機械Ｂの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみあればよく、この場合、突起Ｃ１は１本でもよく複数本でもよく、複数本の場合は、各突起Ｃ１を削孔方向に一列に配列する。
（ステップ２）
地盤Ｇの回転削孔施工に当たり、アースオーガＡ先端の削孔機械Ｂの先端を地盤Ｇ上の設計位置の削孔位置にセットし、設計方向の削孔方向を確認した後、施工を開始する。この場合、傾斜計などにより孔曲りをリアルタイムに計測しながら削孔を進め、削孔した孔Ｇ１の傾斜や曲り傾向を把握する。
（ステップ３）
削孔機械Ｂによる地盤Ｇの削孔中に、削孔した孔Ｇ１に傾斜や曲りが生じた場合、すなわち、削孔機械Ｂが正規の軌道を外れて、削孔した孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がった場合、アースオーガＡ先端の削孔機械Ｂを削孔した孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がり始めた位置まで引き戻す。そして、この引き戻した位置の孔Ｇ１の内周面でこの孔Ｇ１が曲がった方向とは反対の面をほぐし施工面Ｇ２とする。
（ステップ４）
続いて、削孔機械Ｂの外周部に設置した専用の突起Ｃ１を利用して、ほぐし施工面Ｇ２をほぐす。すなわち、削孔機械Ｂの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ設置した突起Ｃ１をほぐし施工面Ｇ２に突入させて削孔機械Ｂの正逆回転により揺動させることにより、突起Ｃ１でほぐし施工面Ｇ２、つまり、孔Ｇ１の傾斜、曲り方向とは反対側の地盤を部分的に切削してほぐす。この場合、孔Ｇ１の傾斜、曲りの原因となる地盤を集中的に緩めるため、アースオーガＡ先端の削孔機械Ｂを孔Ｇ１の傾斜、曲りの原因となる地盤に相当する一定深度に固定して削孔機械Ｂを揺動回転させることにより、専用の突起Ｃ１で孔Ｇ１の傾斜、曲りの原因となる地盤に繰り返し接触し切削してほぐし緩める。このようにして、これまで削孔機械Ｂによる削孔の抵抗となっていた掘削した孔Ｇ１の傾斜、曲り方向とは反対側の地盤が緩むことによって、孔Ｇ１の傾斜、曲りが解消され、削孔機械Ｂが正規の削孔位置、削孔方向に戻り、削孔機械Ｂの地盤Ｇに対する正規の削孔位置、削孔方向が修正される。これにより、削孔した孔Ｇ１を正規の削孔位置、削孔方向に修正する。
なお、専用の突起Ｃ１を削孔機械Ｂの外周部に固定設置する場合、この突起Ｃ１は施工中常時削孔機械Ｂの外周部から突出される形式を採り、専用の突起Ｃ１を削孔機械Ｂの外周部に出没可能に取り付けて、油圧駆動などにより駆動する場合、この突起Ｃ１は掘削した孔Ｇ１の傾斜、曲りの修正時にのみ削孔機械Ｂの外周部から突出される形式を採る。これら２通りの形式は、アースオーガＡ先端の削孔機械Ｂの種類や地盤の施工方法により使い分けることが好ましい。 The construction procedure by this method will be described more specifically.
(Step 1)
A protrusion C1 dedicated to correcting hole bending is installed in advance on the outer peripheral portion of the hole drilling machine B. In this case, as shown in FIGS. 1 (a2) and 1 (b2), the protrusion C1 is projected from the outer peripheral portion of the drilling machine B at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction. However, the protrusion C1 may be formed to have a predetermined length and fixedly installed on the outer peripheral portion of the drilling machine B by welding or the like so as to be able to plunge into the inner peripheral surface of the drilled hole G1. Further, the drilling machine B may be mounted so as to be able to appear and disappear from the outer peripheral portion thereof, and may be driven by, for example, hydraulic drive, so as to be able to enter and leave the inner peripheral surface of the drilled hole G1. It should be noted that the protrusion C1 only needs to be at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine B. In this case, one protrusion C1 may be provided. However, in the case of a plurality of protrusions C1, the protrusions C1 are arranged in a row in the drilling direction.
(Step 2)
When performing rotary drilling of the ground G, set the tip of the drilling machine B at the tip of the earth auger A at the drilling position of the design position on the ground G, confirm the drilling direction in the design direction, and then start the construction. .. In this case, the drilling is advanced while measuring the hole bending in real time with an inclinometer or the like, and the inclination and the bending tendency of the drilled hole G1 are grasped.
(Step 3)
When the drilled hole G1 is inclined or bent during the drilling of the ground G by the drilling machine B, that is, the drilling machine B deviates from the regular trajectory and the drilled hole G1 is the regular drilling. When the hole is bent out of the hole position and the drilling direction, the hole G1 drilled in the drilling machine B at the tip of the earth auger A is pulled back to the normal drilling position and the position where the drilling machine B at the tip of the earth auger starts to bend. Then, on the inner peripheral surface of the hole G1 at the pulled back position, the surface opposite to the direction in which the hole G1 is bent is loosened to form the construction surface G2.
(Step 4)
Subsequently, the loosening construction surface G2 is loosened by using the dedicated protrusion C1 installed on the outer peripheral portion of the drilling machine B. That is, the protrusion C1 installed at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine B is loosened and plunged into the construction surface G2 in the forward and reverse directions of the drilling machine B. By swinging by rotation, the protrusion C1 partially cuts and loosens the construction surface G2, that is, the ground on the side opposite to the inclination and bending direction of the hole G1. In this case, in order to intensively loosen the ground that causes the inclination and bending of the hole G1, the drilling machine B at the tip of the earth auger A is fixed to a certain depth corresponding to the inclination and bending of the hole G1. By swinging and rotating the drilling machine B, the dedicated protrusion C1 repeatedly contacts the ground causing inclination and bending of the hole G1 to cut and loosen it. In this way, the inclination and bending of the drilled hole G1 which has been a resistance to drilling by the hole drilling machine B are eliminated by loosening the ground on the side opposite to the bending direction. The drilling machine B returns to the regular drilling position and drilling direction, and the regular drilling position and drilling direction of the drilling machine B with respect to the ground G are corrected. As a result, the drilled hole G1 is corrected to the regular drilling position and drilling direction.
When the dedicated protrusion C1 is fixedly installed on the outer peripheral portion of the drilling machine B, the protrusion C1 always protrudes from the outer peripheral portion of the drilling machine B during construction, and the dedicated protrusion C1 is used for the drilling machine. When the protrusion C1 is attached to the outer peripheral portion of B so as to be invisible and driven by hydraulic drive or the like, the protrusion C1 adopts a form of protruding from the outer peripheral portion of the drilling machine B only when the inclination or bending of the drilled hole G1 is corrected. It is preferable to use these two types properly depending on the type of the drilling machine B at the tip of the earth auger A and the construction method of the ground.

以上説明したように、本方法によれば、地盤改良、山留め壁の親杭や基礎杭の打ち込みなどの工事で、アースオーガＡを用いて地盤Ｇを削孔する回転削孔施工を対象に、アースオーガＡ先端の削孔機械Ｂが地盤Ｇの削孔中に所定の軌道をずれて削孔した孔Ｇ１の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔Ｇ１を、孔Ｇ１の傾斜や孔曲りが確認された時点で、正規の削孔位置、削孔方向に容易かつ速やかに修正することができ、これにより、回転削孔施工の施工精度の向上を図ることができる。本方法は深層混合処理工法やアースオーガ工法などの回転削孔施工に広く適用可能であり、各工法において上記と同様の作用効果を得ることができる。 As explained above, according to this method, in the construction such as ground improvement, driving of the main pile and foundation pile of the retaining wall, the rotary drilling work to drill the ground G using the earth auger A is targeted. When the drilling machine B at the tip of the earth auger A deviates from the predetermined trajectory during the drilling of the ground G and the regular drilling position and drilling direction of the hole G1 are bent, the drilled hole G1 is formed. When the inclination or bending of the hole G1 is confirmed, it can be easily and quickly corrected in the regular drilling position and drilling direction, thereby improving the construction accuracy of the rotary drilling work. Can be done. This method can be widely applied to rotary drilling work such as a deep mixing treatment method and an earth auger method, and the same effect as described above can be obtained in each method.

また、図１（ａ１）、（ｂ１）に本方法に用いる回転削孔施工における孔曲り修正装置を併せて示している。なお、この場合、削孔機械Ｂとして、掘削撹拌装置Ｂ１を例示している。図２にこの掘削撹拌装置Ｂ１を拡大して示している。
この孔曲り修正装置（以下、本装置という。）は、地盤の改良、山留め壁の親杭や基礎杭の打ち込みなどの工事で、アースオーガＡの先端に各種の削孔機械Ｂを取り付けて、削孔機械Ｂを地盤Ｇに対して回転下降させて地盤Ｇを削孔する回転削孔施工において、削孔機械Ｂが地盤Ｇの削孔中に所定の軌道をずれて、孔Ｇ１の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔Ｇ１を正規の削孔位置、削孔方向に修正するもので、図１（ａ２）、（ｂ２）に示すように、本装置では、特に、削孔機械Ｂの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、削孔機械Ｂにより地盤Ｇに削孔される孔Ｇ１の内周面に突入可能に突起Ｃ１が突設され、突起Ｃ１が削孔機械Ｂの正逆回転により揺動可能に駆動される形式になっている。 Further, FIGS. 1 (a1) and 1 (b1) also show a hole bending correction device in rotary drilling construction used in this method. In this case, the excavation stirring device B1 is illustrated as the drilling machine B. FIG. 2 shows the excavation agitation device B1 in an enlarged manner.
This hole bending correction device (hereinafter referred to as this device) is used for work such as ground improvement, driving of main piles and foundation piles for retaining walls, and various drilling machines B are attached to the tip of the earth auger A. In the rotary drilling construction in which the drilling machine B is rotated and lowered with respect to the ground G to drill the ground G, the drilling machine B deviates from a predetermined trajectory during the drilling of the ground G, and the hole G1 is regular. When the drilling position and the drilling direction are bent, the drilled hole G1 is corrected to the regular drilling position and the drilling direction. As shown in FIGS. 1 (a2) and 1 (b2), this apparatus is used. Then, in particular, the inner circumference of the hole G1 that is drilled in the ground G by the drilling machine B only at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction in the outer peripheral portion of the drilling machine B. The protrusion C1 is provided so as to be able to enter the surface, and the protrusion C1 is driven so as to be swingable by the forward and reverse rotation of the drilling machine B.

本装置は、孔曲り修正専用の突起Ｃ１がアースオーガＡ先端の削孔機械Ｂの外周部に設けられ、この突起Ｃ１が削孔機械Ｂの正逆回転により揺動駆動されるものであるが、地盤Ｇの施工方法により削孔機械Ｂの構造が異なり、削孔機械Ｂにおける突起Ｃ１の取付位置も削孔機械Ｂの構造に応じて異なる。 In this device, a protrusion C1 dedicated to correcting hole bending is provided on the outer peripheral portion of the drilling machine B at the tip of the earth auger A, and this protrusion C1 is oscillated by the forward and reverse rotation of the drilling machine B. The structure of the drilling machine B differs depending on the construction method of the ground G, and the mounting position of the protrusion C1 on the drilling machine B also differs depending on the structure of the drilling machine B.

例えば、深層混合処理工法の場合、図１に示すように、アースオーガＡに削孔機械Ｂとして掘削撹拌装置Ｂ１が設けられる。この場合、アースオーガＡはエンジン駆動式又は電動モータ駆動式又は油圧駆動式のロッド駆動部３、４により回転駆動されるロッド５を備え、ロッド５は、内軸と、内軸の外側に相互に相対回転可能に装着される外軸とを有する。掘削撹拌装置Ｂ１には種々の形式があるが、一般に次の２つの形式が知られている。第１の形式の掘削撹拌装置は、図２を参考にして説明すると、内軸５１の外周部に内軸５１と一体回転可能に突設される撹拌歯６１と、内軸５１の外周部に内軸５１と一体回転可能に突設される水平撹拌翼６２と、外軸５２の外周部に外軸５２と一体回転可能に突設される水平撹拌翼６３とを備える。この形式では、突起Ｃ１は、撹拌歯６１又は内軸５１の水平撹拌翼６２若しくは外軸５２の水平撹拌翼６３のいずれかでその外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみ設けられ、この場合は、撹拌歯６１又は内軸５１の水平撹拌翼６２若しくは外軸５２の水平撹拌翼６３の一端で、撹拌歯６１又は内軸５１の水平撹拌翼６２若しくは外軸５２の水平撹拌翼６３の延長方向に突設される。この突起Ｃ１は外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設されるので、例えば、突起Ｃ１を撹拌歯６１に設ける場合で、撹拌歯６１がロッド５を中心に対称的に相互に反対方向に延びる一対の撹拌歯６１の場合は、突起Ｃ１を片側一方の撹拌歯６１の一端（先端）に突設し、また、突起Ｃ１を内軸５１の水平撹拌翼６２若しくは外軸５２の水平撹拌翼６３に設ける場合で、内軸５１の水平撹拌翼６２、外軸５２の水平撹拌翼６３がそれぞれロッド５を中心に対称的に相互に反対方向に延びる一対の水平撹拌翼６２、６３の場合は、突起Ｃ１を片側一方の水平撹拌翼６２若しくは６３の一端（先端）に突設することになる。なお、この掘削撹拌装置Ｂ１のように、内軸５１の水平撹拌翼６２が外軸５２の水平撹拌翼６３よりも短い場合で、内軸５１の水平撹拌翼６２に突起Ｃ１を取り付ける場合は、突起Ｃ１を内軸５１の片側一方の水平撹拌翼６２の一端から外軸５２の水平撹拌翼６３の一端よりも外側に突出するように長さを長くして内軸５１の片側一方の水平撹拌翼６２の一端に取り付ける。第２の形式の掘削撹拌装置Ｂ１は、図２に示すように、内軸５１の外周部に内軸５１と一体回転可能に突設される撹拌歯６１と、内軸５１の外周部に内軸５１と一体回転可能に突設される複数の水平撹拌翼６２と、外軸５２の外周部に外軸５２と一体回転可能に突設される複数の水平撹拌翼６３と、外軸５２の各水平撹拌翼６３の端部間に連結される複数の垂直撹拌翼６４とを備える。この形式では、突起Ｃ１は、撹拌歯６１又は外軸５２の垂直撹拌翼６４のいずれかでその外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみ設け、この場合は、撹拌歯６１又は外軸５２の垂直撹拌翼６４の一端で、撹拌歯６１又は外軸５２の水平撹拌翼６３の延長方向に突設される。この突起Ｃ１は外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設されるので、例えば、突起Ｃ１を撹拌歯６１に設ける場合で、撹拌歯６１がロッド５を中心に対称的に相互に反対方向に延びる一対の撹拌歯６１の場合は、突起Ｃ１を片側一方の撹拌歯６１の一端（先端）に突設し、突起Ｃ１を外軸５２の垂直撹拌翼６４に設ける場合で、外軸５２の垂直撹拌翼６４がロッド５の周囲に一定の間隔で複数配置される場合は、突起Ｃ１を複数の垂直撹拌翼６４のうち一つの垂直撹拌翼６４の一端面（先端面）に、この場合、外軸５２の水平撹拌翼６３に対応する位置に、突設することになる。なお。撹拌歯６１が内軸５１に代えて外軸５２に設けられる場合は、突起Ｃ１は外軸５２の撹拌歯６１に上記と同様に設けることができ、また、垂直撹拌翼６４が外軸５２に代えて内軸５１の水平撹拌翼６２の端部間に設けられる場合は、突起Ｃ１は内軸５１の垂直撹拌翼６４に上記と同様に設けることができる。 For example, in the case of the deep mixing treatment method, as shown in FIG. 1, the earth auger A is provided with the excavation stirring device B1 as the drilling machine B. In this case, the earth auger A includes a rod 5 that is rotationally driven by engine-driven, electric motor-driven, or hydraulic-driven rod drive units 3 and 4, and the rods 5 are mutually connected to the inner shaft and the outer side of the inner shaft. It has an outer shaft that is mounted so that it can rotate relative to the other. There are various types of excavation agitator B1, but the following two types are generally known. Explaining that the first type of excavation agitation device is described with reference to FIG. 2, the agitation tooth 61 is provided on the outer peripheral portion of the inner shaft 51 so as to be integrally rotatable with the inner shaft 51, and on the outer peripheral portion of the inner shaft 51. A horizontal stirring blade 62 projecting integrally with the inner shaft 51 so as to be integrally rotatable, and a horizontal stirring blade 63 protruding integrally with the outer shaft 52 on the outer peripheral portion of the outer shaft 52 are provided. In this form, the protrusion C1 is formed at a position constant with respect to the excavation direction and in the rotational direction at the outer peripheral portion of either the stirring tooth 61, the horizontal stirring blade 62 of the inner shaft 51, or the horizontal stirring blade 63 of the outer shaft 52. On the other hand, it is provided in only one direction, and in this case, at one end of the horizontal stirring blade 62 of the stirring tooth 61 or the inner shaft 51 or the horizontal stirring blade 63 of the outer shaft 52, the horizontal stirring blade 62 of the stirring tooth 61 or the inner shaft 51. Alternatively, it is projected in the extension direction of the horizontal stirring blade 63 of the outer shaft 52. Since the protrusion C1 is projected from the outer peripheral portion at a fixed position with respect to the excavation direction and only in one direction with respect to the rotation direction, for example, when the protrusion C1 is provided on the stirring tooth 61, the stirring tooth 61 is a rod. In the case of a pair of stirring teeth 61 that extend symmetrically with respect to 5 in opposite directions, the protrusion C1 is projected from one end (tip) of the stirring tooth 61 on one side, and the protrusion C1 is provided on the inner shaft 51. When the horizontal stirring blade 62 or the horizontal stirring blade 63 of the outer shaft 52 is provided, the horizontal stirring blade 62 of the inner shaft 51 and the horizontal stirring blade 63 of the outer shaft 52 are symmetrically opposite to each other with respect to the rod 5 as the center. In the case of a pair of extending horizontal stirring blades 62 and 63, the protrusion C1 is projected from one end (tip) of one of the horizontal stirring blades 62 or 63 on one side. When the horizontal stirring blade 62 of the inner shaft 51 is shorter than the horizontal stirring blade 63 of the outer shaft 52 and the protrusion C1 is attached to the horizontal stirring blade 62 of the inner shaft 51 as in the excavation stirring device B1, the protrusion C1 is attached. The length of the protrusion C1 is increased so as to protrude outward from one end of the horizontal stirring blade 62 on one side of the inner shaft 51 to the outside of one end of the horizontal stirring blade 63 on the outer shaft 52, and horizontal stirring on one side of the inner shaft 51 is performed. Attached to one end of the wing 62. As shown in FIG. 2, the second type of excavation stirring device B1 has a stirring tooth 61 projecting integrally with the inner shaft 51 on the outer peripheral portion of the inner shaft 51 and inside the outer peripheral portion of the inner shaft 51. A plurality of horizontal stirring blades 62 projecting integrally with the shaft 51 so as to be integrally rotatable, a plurality of horizontal stirring blades 63 protruding integrally with the outer shaft 52 on the outer peripheral portion of the outer shaft 52, and the outer shaft 52. A plurality of vertical stirring blades 64 connected between the ends of each horizontal stirring blade 63 are provided. In this form, the protrusion C1 is provided at a position constant with respect to the excavation direction and only in one direction with respect to the rotation direction at the outer peripheral portion of either the stirring tooth 61 or the vertical stirring blade 64 of the outer shaft 52. In this case, one end of the vertical stirring blade 64 of the stirring tooth 61 or the outer shaft 52 is projected in the extension direction of the horizontal stirring blade 63 of the stirring tooth 61 or the outer shaft 52. Since the protrusion C1 is projected from the outer peripheral portion at a fixed position with respect to the excavation direction and only in one direction with respect to the rotation direction, for example, when the protrusion C1 is provided on the stirring tooth 61, the stirring tooth 61 is a rod. In the case of a pair of stirring teeth 61 that extend symmetrically with respect to 5 in opposite directions, the protrusion C1 is projected from one end (tip) of one of the stirring teeth 61 on one side, and the protrusion C1 is vertically stirred on the outer shaft 52. In the case of providing the blade 64, when a plurality of vertical stirring blades 64 of the outer shaft 52 are arranged around the rod 5 at regular intervals, the protrusion C1 is provided on the vertical stirring blade 64 of one of the plurality of vertical stirring blades 64. In this case, it is projected on one end surface (tip surface) at a position corresponding to the horizontal stirring blade 63 of the outer shaft 52. In addition. When the stirring tooth 61 is provided on the outer shaft 52 instead of the inner shaft 51, the protrusion C1 can be provided on the stirring tooth 61 of the outer shaft 52 in the same manner as described above, and the vertical stirring blade 64 is provided on the outer shaft 52. Instead, when provided between the ends of the horizontal stirring blade 62 of the inner shaft 51, the protrusion C1 can be provided on the vertical stirring blade 64 of the inner shaft 51 in the same manner as described above.

また例えば、杭を圧入する工法の場合は、アースオーガＡに削孔機械Ｂとしてスクリュ（図示省略）が設けられる。アースオーガＡはエンジン駆動式又は電動モータ駆動式又は油圧駆動式のロッド駆動部３、４により回転駆動されるロッド５を備える。スクリュはロッド５の先端（下端）に設けられる。この場合、突起は、スクリュの外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される。 Further, for example, in the case of a construction method in which a pile is press-fitted, a screw (not shown) is provided as a drilling machine B in the earth auger A. The earth auger A includes a rod 5 that is rotationally driven by engine-driven, electric motor-driven, or hydraulically driven rod drive units 3 and 4. The screw is provided at the tip (lower end) of the rod 5. In this case, the protrusions are projected from the outer peripheral portion of the screw at a fixed position with respect to the excavation direction and only in one direction with respect to the rotation direction.

また、本装置の突起Ｃ１の形状は、棒形（丸棒形、角棒形）、凸形、円錐形、角錐形など、地盤Ｇに掘削した孔Ｇ１の内周面に突入可能で固い地盤Ｇでもほぐしやすい形状であることが好ましい。 Further, the shape of the protrusion C1 of this device is a rod shape (round bar shape, square bar shape), convex shape, conical shape, pyramid shape, etc., which is a hard ground that can be pierced into the inner peripheral surface of the hole G1 excavated in the ground G. It is preferable that the shape is easy to loosen even in G.

さらに、本装置の突起Ｃ１は、本方法で既述したとおり、所定の長さに形成され、削孔機械Ｂの外周部に溶接などにより固定設置されて、削孔した孔Ｇ１の内周面に対して突入可能にしてもよく、削孔機械Ｂの外周部に出没可能に取り付けられ、例えば油圧駆動などにより駆動するようにして、削孔した孔Ｇ１の内周面に対して突入離脱可能に設けられてもよい。この突起Ｃ１は削孔機械Ｂの外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみあればよく、この場合、突起Ｃ１は１本でもよく複数本でもよく、複数本の場合は、各突起Ｃ１は削孔方向に一列に配列される。 Further, the protrusion C1 of the present device is formed to a predetermined length as described above in the present method, and is fixedly installed on the outer peripheral portion of the drilling machine B by welding or the like, and the inner peripheral surface of the drilled hole G1 is formed. It may be possible to rush into the hole G1 so that it can be pierced and detached from the inner peripheral surface of the hole G1 by being mounted on the outer peripheral portion of the drilling machine B so as to be driven by, for example, hydraulic drive. It may be provided in. The protrusion C1 may be provided at a fixed position with respect to the excavation direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine B. In this case, the protrusion C1 may be one or a plurality. In the case of a plurality of protrusions C1, the protrusions C1 are arranged in a row in the drilling direction.

本装置はかかる構成を備え、本方法の実施に用いることができる。すなわち、地盤の改良、山留め壁の親杭や基礎杭の打ち込みなどの工事で、図１に示すように、アースオーガＡ（のロッド５の）の先端に各種の削孔機械Ｂを取り付けて、削孔機械Ｂを地盤Ｇに対して回転下降させて地盤Ｇを削孔する回転削孔施工において、削孔機械Ｂによる地盤Ｇの削孔中に、削孔機械Ｂが正規の軌道を外れて、削孔した孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がったときに、削孔機械Ｂが削孔された孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がり始めた位置まで引き戻され、この位置で、削孔機械Ｂの外周部において掘削方向に対して一定の位置にかつ回転方向に対して一方向にのみ設けられた突起Ｃ１が削孔機械Ｂの回転により旋回されて、削孔された孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がった方向とは反対の面、すなわち、ほぐし施工面Ｇ２に向けて突入され、このほぐし施工面Ｇ２の範囲で削孔機械Ｂの正逆回転により突起Ｃ１が揺動されて、この突起Ｃ１でほぐし施工面Ｇ２をほぐし、削孔機械Ｂの地盤Ｇに対する正規の削孔位置、削孔方向を修正し、削孔した孔Ｇ１を正規の削孔位置、削孔方向に修正する。 The device has such a configuration and can be used to carry out the method. That is, as shown in FIG. 1, various drilling machines B are attached to the tip of the earth auger A (of the rod 5) in the work such as improving the ground and driving the main pile and the foundation pile of the retaining wall. In the rotary drilling construction in which the drilling machine B is rotated and lowered with respect to the ground G to drill the ground G, the drilling machine B deviates from the regular track during the drilling of the ground G by the drilling machine B. When the drilled hole G1 deviates from the regular drilling position and drilling direction and bends, the hole G1 drilled by the drilling machine B deviates from the regular drilling position and drilling direction and begins to bend. At this position, the protrusion C1 provided at a fixed position with respect to the excavation direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine B is formed by the rotation of the drilling machine B. The swirled and drilled hole G1 is rushed toward the surface opposite to the regular drilling position and the direction opposite to the bending direction, that is, the loosening construction surface G2, and the unraveling construction surface G2 The protrusion C1 is swung by the forward and reverse rotation of the drilling machine B within the range, and the loosening construction surface G2 is loosened by the protrusion C1 to correct the regular drilling position and drilling direction of the drilling machine B with respect to the ground G. , Correct the drilled hole G1 in the regular drilling position and drilling direction.

以上説明したように、本装置によれば、地盤改良、山留め壁の親杭や基礎杭の打ち込みなどの工事で、アースオーガＡを用いて地盤Ｇを削孔する回転削孔施工を対象に、アースオーガＡ先端の削孔機械Ｂが地盤Ｇの削孔中に所定の軌道をずれて削孔した孔Ｇ１の正規の削孔位置、削孔方向が曲がった場合に、孔Ｇ１の傾斜や孔曲りが確認された時点で、削孔した孔Ｇ１を正規の削孔位置、削孔方向に容易かつ速やかに修正することができ、これにより、回転削孔施工の施工精度の向上を図ることができる。本装置は深層混合処理工法やアースオーガ工法などの回転削孔施工に広く適用可能であり、各工法において上記と同様の作用効果を得ることができる。 As explained above, according to this device, for the construction such as ground improvement, driving of the main pile and foundation pile of the retaining wall, the rotary drilling work to drill the ground G using the earth auger A is targeted. When the drilling machine B at the tip of the earth auger A deviates from a predetermined trajectory during drilling of the ground G, the regular drilling position and drilling direction of the hole G1 are bent, the hole G1 is tilted or the hole is drilled. When the bending is confirmed, the drilled hole G1 can be easily and quickly corrected in the regular drilling position and drilling direction, thereby improving the construction accuracy of the rotary drilling work. it can. This device can be widely applied to rotary drilling work such as deep mixing treatment method and earth auger method, and the same effect as described above can be obtained in each method.

図３に深層混合処理工法での回転削孔施工における本方法及び本装置の適用例を示している。 FIG. 3 shows an application example of this method and this device in rotary drilling work by the deep mixing treatment method.

まず、この深層混合処理工法に用いるアースオーガＡについて本装置とともに説明する。図３に示すように、アースオーガＡは、クローラクレーン１と、クローラクレーン１により支持されて鉛直方向に立ち上げられたリーダ２と、リーダ２に昇降自在に取り付けられたロータリドライブ３（ロッド駆動部）及びロータリドライブ３下部のギアボックス４（ロッド駆動部）と、ロータリドライブ３の下部にギアボックス４を介して正逆回転可能に連結されたロッド５とを備える。この場合、ロッド５は、図２に示すように、内軸５１と外軸５２とからなり、内軸５１と外軸５２はそれぞれロータリドライブ３の回転駆動により相互に反対方向に正逆回転可能になっている。なお、内軸５１内には固化材の供給通路が設けられて、この固化材供給通路の下端は内軸５１の最下端の固化材吐出口（図示省略）に連通される。このアースオーガＡ（のロッド５）の先端（下端）には、削孔機械Ｂとして掘削撹拌装置Ｂ１が設けられる。この掘削撹拌装置Ｂは、内軸５１の最下端外周部に内軸５１と一体回転可能に突設される撹拌歯６１と、内軸５１の外周部で撹拌歯６１の上方所定の位置に上下方向に所定の間隔を介して内軸５１と一体回転可能に突設される複数（この場合、２組一対）の水平撹拌翼６２と、外軸５２の外周部で撹拌歯６１の上方所定の位置、この場合、内軸５１の各水平撹拌翼６２の上下両側及び各水平撹拌翼６２間に、上下方向に所定の間隔を介して外軸５２と一体回転可能に突設される複数（この場合、３組一対）の水平撹拌翼６３と、外軸５２の各水平撹拌翼６３は内軸５１の各水平撹拌翼６２よりも長く、外軸５２の各水平撹拌翼６３の端部間に連結される複数（この場合、２つ）の垂直撹拌翼６４とを備える。この場合、本装置の突起Ｃ１は外軸５２の一方の垂直撹拌翼６４の一端面に外軸５２の水平撹拌翼６３の延長方向に向けて突設される。 First, the earth auger A used in this deep mixing treatment method will be described together with this apparatus. As shown in FIG. 3, the earth auger A includes a crawler crane 1, a leader 2 supported by the crawler crane 1 and raised in the vertical direction, and a rotary drive 3 (rod drive) attached to the leader 2 so as to be vertically movable. A gearbox 4 (rod drive unit) at the lower part of the rotary drive 3 and a rod 5 connected to the lower part of the rotary drive 3 via a gearbox 4 so as to be rotatable in the forward and reverse directions. In this case, as shown in FIG. 2, the rod 5 includes an inner shaft 51 and an outer shaft 52, and the inner shaft 51 and the outer shaft 52 can rotate forward and reverse in opposite directions by the rotational drive of the rotary drive 3, respectively. It has become. A solidifying material supply passage is provided in the inner shaft 51, and the lower end of the solidifying material supply passage communicates with the solidifying material discharge port (not shown) at the lowermost end of the inner shaft 51. An excavation stirring device B1 is provided as a drilling machine B at the tip (lower end) of the earth auger A (rod 5). The excavation stirring device B has a stirring tooth 61 projecting integrally with the inner shaft 51 at the outermost peripheral portion of the lowermost end of the inner shaft 51, and an upper and lower predetermined position above the stirring tooth 61 at the outer peripheral portion of the inner shaft 51. A plurality of (in this case, a pair of two sets) horizontal stirring blades 62 projecting integrally with the inner shaft 51 via a predetermined interval in the direction, and a predetermined upper portion of the stirring teeth 61 on the outer peripheral portion of the outer shaft 52. Positions, in this case, a plurality of protrusions rotatably integrally with the outer shaft 52 in the vertical direction at predetermined intervals between the upper and lower sides of each horizontal stirring blade 62 of the inner shaft 51 and each horizontal stirring blade 62 (this). In the case, the horizontal stirring blades 63 of the outer shaft 52 and the horizontal stirring blades 63 of the outer shaft 52 are longer than the horizontal stirring blades 62 of the inner shaft 51, and are between the ends of the horizontal stirring blades 63 of the outer shaft 52. It includes a plurality of (in this case, two) vertical stirring blades 64 to be connected. In this case, the protrusion C1 of the present device is projected from one end surface of one of the vertical stirring blades 64 of the outer shaft 52 toward the extension direction of the horizontal stirring blade 63 of the outer shaft 52.

次に、アースオーガＡを用いた深層混合処理工法の施工手順とともに本装置を用いた本方法の施工手順ついて説明する。
先ず、図３（ステップ１）に示すように、クローラクレーン１によりリーダ２を設計位置となる削孔位置の近傍所定位置に立設させて、ロッド５先端の掘削撹拌装置Ｂ１を設計位置の削孔位置にセットする。 Next, the construction procedure of the deep mixing treatment method using the earth auger A and the construction procedure of this method using the present apparatus will be described.
First, as shown in FIG. 3 (step 1), the crawler crane 1 is used to erect the leader 2 at a predetermined position near the drilling position, which is the design position, and the excavation agitation device B1 at the tip of the rod 5 is ground at the design position. Set at the hole position.

次に、図３（ステップ２）に示すように、アースオーガＡのロータリドライブ３が作動されて、掘削撹拌装置Ｂ１が回転される。すなわち、内軸５１と外軸５２が相互に反対方向に相対回転され、これにより、内軸５１と一体回転する撹拌歯６１及び各水平撹拌翼６２と、外軸５２と一体回転する各水平撹拌翼６３が相互に相反する方向に相対回転する。そして、この掘削撹拌装置Ｂ１が地盤Ｇに対して回転下降されて地盤Ｇに貫入し地盤Ｇに丸い孔を掘削しながら、内軸５１最下端の固化材吐出口から固化材が吐出される。掘削撹拌装置Ｂ１で掘削された土砂は、各水平撹拌翼６２、６３の相互に相反する相対回転により、水平方向、垂直方向に混練され、掘削土と固化材が効率良く撹拌混合される。また、各垂直撹拌翼６４が外軸５２の各水平撹拌翼６３の端部間にて外軸５２の周囲で回転され、各垂直撹拌翼６４により、掘削土が円柱状に切り取られる。 Next, as shown in FIG. 3 (step 2), the rotary drive 3 of the earth auger A is operated to rotate the excavation stirring device B1. That is, the inner shaft 51 and the outer shaft 52 are rotated relative to each other in opposite directions, whereby the stirring teeth 61 and the horizontal stirring blades 62 that rotate integrally with the inner shaft 51 and each horizontal stirring that rotates integrally with the outer shaft 52. The wings 63 rotate relative to each other in opposite directions. Then, the excavation agitation device B1 is rotationally lowered with respect to the ground G, penetrates into the ground G, excavates a round hole in the ground G, and discharges the solidifying material from the solidifying material discharge port at the lowermost end of the inner shaft 51. The earth and sand excavated by the excavation agitator B1 are kneaded in the horizontal and vertical directions by the relative rotations of the horizontal agitation blades 62 and 63, and the excavated soil and the solidifying material are efficiently agitated and mixed. Further, each vertical stirring blade 64 is rotated around the outer shaft 52 between the ends of each horizontal stirring blade 63 of the outer shaft 52, and each vertical stirring blade 64 cuts the excavated soil into a columnar shape.

この掘削撹拌装置Ｂ１による地盤Ｇの削孔、撹拌中に、掘削撹拌装置Ｂ１が正規の軌道を外れて、削孔した孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がったときは、図１（ｂ１）に示すように、掘削撹拌装置Ｂ１が、削孔された孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がり始めた位置まで引き戻され、この位置で、掘削撹拌装置Ｂ１の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ設けられた突起Ｃ１、この場合、外軸５２の一方の垂直撹拌翼６４の一端面に外軸５２の水平撹拌翼６３の延長方向に向けて設けられた突起Ｃ１が掘削撹拌装置Ｂ１の回転により旋回されて、削孔された孔Ｇ１が正規の削孔位置、削孔方向から外れて曲がった方向とは反対の面、すなわち、ほぐし施工面Ｇ２に向けて突入され、このほぐし施工面Ｇ２の範囲で掘削撹拌装置Ｂの正逆回転により突起Ｃ１が揺動されて、この突起Ｃ１でほぐし施工面Ｇ２をほぐし、掘削撹拌装置Ｂ１を地盤Ｇに対する正規の削孔位置、削孔方向に修正する。これにより、削孔した孔Ｇ１が正規の削孔位置、削孔方向に修正される。 When the excavation agitator B1 deviates from the regular orbit and the drilled hole G1 deviates from the regular drilling position and drilling direction and bends during drilling and stirring of the ground G by the drilling and stirring device B1. As shown in FIG. 1 (b1), the excavation agitation device B1 is pulled back to the position where the perforated hole G1 deviates from the regular drilling position and the perforation direction and begins to bend, and at this position, the excavation agitation is performed. A protrusion C1 provided at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the device B1, in this case, outside on one end surface of one vertical stirring blade 64 of the outer shaft 52. The protrusion C1 provided in the extension direction of the horizontal stirring blade 63 of the shaft 52 is swiveled by the rotation of the excavation stirring device B1, and the drilled hole G1 is bent away from the regular drilling position and drilling direction. It is rushed toward the surface opposite to the direction opposite to the direction, that is, the loosening construction surface G2, and the protrusion C1 is swung by the forward and reverse rotation of the excavation agitation device B within the range of the loosening construction surface G2, and the protrusion C1 is used for loosening. The construction surface G2 is loosened, and the excavation agitation device B1 is corrected to the regular drilling position and drilling direction with respect to the ground G. As a result, the drilled hole G1 is corrected in the regular drilling position and drilling direction.

かくして、図３（ステップ２）、（ステップ３）に示すように、掘削撹拌装置Ｂ１が地盤Ｇの設計位置の掘削位置から設計方向の切削方向、この場合、鉛直方向へ設計深さまで回転下降されて地盤Ｇ内が削孔されて、各水平撹拌翼６２、６３の相反回転により、掘削土と固化材が効率良く撹拌混合され、各垂直撹拌翼６４により、掘削土は円柱状に切り取られて、外軸５２の水平撹拌翼６３の長さと一致する半径を有する円柱状の改良体が造成される。 Thus, as shown in FIGS. 3 (step 2) and 3 (step 3), the excavation agitation device B1 is rotated and lowered from the excavation position at the design position of the ground G to the cutting direction in the design direction, in this case, the vertical direction to the design depth. The inside of the ground G is drilled, the excavated soil and the solidifying material are efficiently agitated and mixed by the reciprocal rotation of each of the horizontal agitating blades 62 and 63, and the excavated soil is cut into a columnar shape by each of the vertical agitating blades 64. , A columnar improved body having a radius matching the length of the horizontal stirring blade 63 of the outer shaft 52 is created.

そして、図３（ステップ４）に示すように、掘削撹拌装置Ｂ１は地上に向かって引き上げられる。この引上げ時、ロータリドライブ３の回転方向が貫入時と同じ方向であり、内軸５１と外軸５２が貫入時と同じ方向に相対回転されて掘削撹拌装置Ｂ１が引き上げられ、これにより、固化材と掘削土を混合された改良土が再び撹拌混合されて、施工を完了する。 Then, as shown in FIG. 3 (step 4), the excavation stirring device B1 is pulled up toward the ground. At the time of this pulling, the rotation direction of the rotary drive 3 is the same as that at the time of penetration, and the inner shaft 51 and the outer shaft 52 are relatively rotated in the same direction as at the time of penetration, and the excavation agitator B1 is pulled up, whereby the solidifying material is pulled up. The improved soil mixed with the excavated soil is stirred and mixed again to complete the construction.

このように、アースオーガＡを用いた深層混合処理工法での回転削孔施工において、アースオーガＡ先端の掘削撹拌装置Ｂ１が地盤Ｇの削孔中に所定の軌道をずれて削孔した孔Ｇ１の正規の削孔位置、削孔方向が曲がった場合に、孔Ｇ１の傾斜や孔曲りが確認された時点で、削孔した孔Ｇ１を正規の削孔位置、削孔方向に容易かつ速やかに修正することができ、回転削孔施工の施工精度を向上させることができる。 As described above, in the rotary drilling construction by the deep mixing treatment method using the earth auger A, the excavation agitator B1 at the tip of the earth auger A drills a hole G1 that is deviated from a predetermined trajectory during the drilling of the ground G. When the regular drilling position and the drilling direction are bent, when the inclination and the hole bending of the hole G1 are confirmed, the drilled hole G1 is easily and quickly moved to the regular drilling position and the drilling direction. It can be corrected and the construction accuracy of rotary drilling can be improved.

なお、ここでは、深層混合処理工法での回転削孔施工における本方法及び本装置の適用例を示したが、杭の圧入工法での回転削孔施工においても、本方法及び本装置を同様に適用することができ、上記と同様の作用効果を得ることができる。 Here, the application example of this method and this device in the rotary drilling construction by the deep mixing treatment method is shown, but in the rotary drilling construction by the press-fitting method of piles, this method and this device are similarly applied. It can be applied, and the same action and effect as described above can be obtained.

Ａ アースオーガ
１ クローラクレーン
２ リーダ
３ ロータリドライブ（ロッド駆動部）
４ ギアボックス（ロッド駆動部）
５ ロッド
５１ 内軸
５２ 外軸
Ｂ 削孔機械
Ｂ１ 掘削撹拌装置
６１ 撹拌歯
６２ 水平撹拌翼
６３ 水平撹拌翼
６４ 垂直撹拌翼
Ｃ１ 突起
Ｇ 地盤
Ｇ１ 孔
Ｇ２ ほぐし施工面 A Earth auger 1 Crawler crane 2 Leader 3 Rotary drive (rod drive unit)
4 Gearbox (rod drive unit)
5 Rod 51 Inner shaft 52 Outer shaft B Drilling machine B1 Excavation stirrer 61 Stirring tooth 62 Horizontal stirring blade 63 Horizontal stirring blade 64 Vertical stirring blade C1 Protrusion G Ground G1 Hole G2 Loosening construction surface

Claims (7)

アースオーガの先端に各種の削孔機械を取り付けて、前記削孔機械を地盤に対して回転下降させて地盤を削孔する回転削孔施工において、前記削孔機械が地盤の削孔中に所定の軌道をずれて、孔の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔を正規の削孔位置、削孔方向に修正する回転削孔施工における孔曲り修正方法であって、
前記削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械により地盤に削孔される孔の内周面に対して突入可能に突起を設けておき、
前記削孔機械による地盤の削孔中、前記削孔機械が正規の軌道を外れて、削孔した孔が正規の削孔位置、削孔方向から外れて曲がったときに、前記削孔機械を前記削孔した孔が前記正規の削孔位置、削孔方向から外れて曲がり始めた位置まで戻し、前記削孔した孔の内周面において前記削孔した孔が前記正規の削孔位置、削孔方向から外れて曲がった方向とは反対の面をほぐし施工面として、前記突起を前記ほぐし施工面に突入させて前記削孔機械の正逆回転により揺動させることにより前記突起で前記ほぐし施工面をほぐし、前記削孔機械を地盤に対する正規の削孔位置、削孔方向に修正する、
ことを特徴する回転削孔施工における孔曲り修正方法。 In rotary drilling work in which various drilling machines are attached to the tip of an earth auger and the drilling machine is rotated and lowered with respect to the ground to drill holes in the ground, the drilling machine is specified during drilling in the ground. When the regular drilling position and drilling direction of the hole are bent, the drilled hole is corrected to the regular drilling position and drilling direction. There,
It is possible to plunge into the inner peripheral surface of a hole drilled in the ground by the drilling machine only at a fixed position with respect to the drilling direction and in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine. With a protrusion on the
During drilling of the ground by the drilling machine, when the drilling machine deviates from the regular track and the drilled hole deviates from the regular drilling position and drilling direction and bends, the drilling machine is operated. The drilled hole is returned to the position where the drilled hole deviates from the regular drilling position and the drilling direction and begins to bend, and the drilled hole is the regular drilling position and drilling on the inner peripheral surface of the drilled hole. The surface opposite to the bending direction deviating from the hole direction is used as the unraveling construction surface, and the protrusion is rushed into the unraveling construction surface and swung by the forward and reverse rotation of the drilling machine to perform the unraveling work with the protrusion. Loosen the surface and correct the drilling machine to the regular drilling position and drilling direction with respect to the ground.
A method for correcting hole bending in rotary drilling construction, which is characterized by this. 突起は削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械の外周部から出没して削孔した孔の内周面に対して突入離脱可能に設ける請求項１に記載の回転削孔施工における孔曲り修正方法。 The protrusions appear at a fixed position with respect to the drilling direction on the outer peripheral portion of the drilling machine and only in one direction with respect to the rotation direction, and appear on the inner peripheral surface of the hole drilled by appearing from the outer peripheral portion of the drilling machine. On the other hand, the method for correcting hole bending in rotary drilling construction according to claim 1, which is provided so as to be able to rush and detach. アースオーガの先端に各種の削孔機械を取り付けて、前記削孔機械を地盤に対して回転下降させて地盤を削孔する回転削孔施工において、前記削孔機械が地盤の削孔中に所定の軌道をずれて、孔の正規の削孔位置、削孔方向が曲がった場合に、削孔した孔を正規の削孔位置、削孔方向に修正する回転削孔施工における孔曲り修正装置であって、
前記削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械により地盤に削孔される孔の内周面に突入可能に突起が突設され、前記突起は前記削孔機械の正逆回転により揺動可能に駆動される、
ことを特徴する回転削孔施工における孔曲り修正装置。 In rotary drilling work in which various drilling machines are attached to the tip of an earth auger and the drilling machine is rotated and lowered with respect to the ground to drill holes in the ground, the drilling machine is specified during drilling in the ground. With a hole bending correction device in rotary drilling construction that corrects the drilled hole in the regular drilling position and drilling direction when the regular drilling position and drilling direction of the hole deviates from the trajectory of There,
A protrusion that can enter the inner peripheral surface of a hole drilled in the ground by the drilling machine only at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction on the outer peripheral portion of the drilling machine. Is projected, and the protrusion is oscillatingly driven by the forward and reverse rotation of the drilling machine.
A hole bending correction device in rotary drilling construction, which is characterized by this. アースオーガはロッド駆動部により回転駆動されるロッドを備え、前記ロッドは、内軸と、前記内軸の外側に相互に相対回転可能に装着される外軸とを有し、削孔機械は、前記内軸又は前記外軸の外周部に前記内軸又は前記外軸と一体回転可能に突設される撹拌歯と、前記内軸の外周部に前記内軸と一体回転可能に突設される水平撹拌翼と、前記外軸の外周部に前記外軸と一体回転可能に突設される水平撹拌翼とを備え、突起は、前記撹拌歯又は前記内軸若しくは前記外軸の前記水平撹拌翼のいずれかでその外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される請求項３に記載の回転削孔施工における孔曲り修正装置。 The earth auger includes a rod that is rotationally driven by a rod drive unit, the rod having an inner shaft and an outer shaft that is mounted on the outside of the inner shaft so as to be relatively rotatable with respect to each other. Stirring teeth projecting integrally with the inner shaft or the outer shaft on the outer peripheral portion of the inner shaft or the outer shaft, and projecting integrally with the inner shaft on the outer peripheral portion of the inner shaft. The horizontal stirring blade is provided with a horizontal stirring blade and a horizontal stirring blade rotatably projecting from the outer peripheral portion of the outer shaft so as to be integrally rotatable with the outer shaft. The hole bending correction device for rotary drilling work according to claim 3, wherein the outer peripheral portion of any of the above is projected at a fixed position with respect to the drilling direction and only in one direction with respect to the rotation direction. アースオーガはロッド駆動部により回転駆動されるロッドを備え、前記ロッドは、内軸と、前記内軸の外側に相互に相対回転可能に装着される外軸とを有し、削孔機械は、前記内軸又は前記外軸の外周部に前記内軸又は前記外軸と一体回転可能に突設される撹拌歯と、前記内軸の外周部に前記内軸と一体回転可能に突設される複数の水平撹拌翼と、前記外軸の外周部に前記外軸と一体回転可能に突設される複数の水平撹拌翼と、前記内軸若しくは前記外軸の前記各水平撹拌翼の端部間に連結される複数の垂直撹拌翼とを備え、突起は、前記撹拌歯又は前記内軸若しくは前記外軸の前記垂直撹拌翼のいずれかでその外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される請求項３に記載の回転削孔施工における孔曲り修正装置。 The earth auger includes a rod that is rotationally driven by a rod drive unit, the rod having an inner shaft and an outer shaft that is mounted on the outside of the inner shaft so as to be relatively rotatable with respect to each other. Stirring teeth projecting integrally with the inner shaft or the outer shaft on the outer peripheral portion of the inner shaft or the outer shaft, and projecting integrally with the inner shaft on the outer peripheral portion of the inner shaft. Between a plurality of horizontal stirring blades, a plurality of horizontal stirring blades rotatably projecting from the outer peripheral portion of the outer shaft, and the ends of the horizontal stirring blades of the inner shaft or the outer shaft. With a plurality of vertical stirring blades connected to, the protrusions are located at a fixed position with respect to the drilling direction at the outer peripheral portion of either the stirring teeth or the vertical stirring blades of the inner shaft or the outer shaft. The hole bending correction device in the rotary drilling construction according to claim 3, which is projected in only one direction with respect to the rotation direction. アースオーガはロッド駆動部により回転駆動されるロッドを備え、削孔機械は前記ロッドの先端部に設けられるスクリュからなり、突起は、前記スクリュの外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ突設される請求項３に記載の回転削孔施工における孔曲り修正装置。 The earth auger includes a rod that is rotationally driven by a rod drive unit, the drilling machine consists of a screw provided at the tip of the rod, and the protrusion is located at a fixed position in the drilling direction on the outer peripheral portion of the screw. The hole bending correction device in the rotary drilling construction according to claim 3, which is projected in only one direction with respect to the rotation direction. 突起は削孔機械の外周部において削孔方向に対して一定の位置にかつ回転方向に対して一方向にのみ、前記削孔機械の外周部から出没して削孔した孔の内周面に対して突入離脱可能に設けられる請求項３乃至６のいずれかに記載の回転削孔施工における孔曲り修正装置。 The protrusions appear at a fixed position with respect to the drilling direction on the outer peripheral portion of the drilling machine and only in one direction with respect to the rotation direction, and appear on the inner peripheral surface of the hole drilled by appearing from the outer peripheral portion of the drilling machine. On the other hand, the hole bending correction device in the rotary drilling construction according to any one of claims 3 to 6, which is provided so as to be able to rush and detach.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001032662A (en) * 1999-07-21 2001-02-06 Asahi Kiso Kk Earth auger
JP2002276276A (en) * 2001-03-13 2002-09-25 Tomotake Shigemori Excavation bit for ground boring device
JP2003247387A (en) * 2002-02-26 2003-09-05 Kajima Corp Method for controlling direction in horizontal drilling, and drill rod for use therein
JP2005207202A (en) * 2004-01-21 2005-08-04 Sanwa Kizai Co Ltd Bending correction device for excavated hole
JP2009228246A (en) * 2008-03-21 2009-10-08 Travers Corp Drilling and agitation equipment for soil improvement
JP2011069093A (en) * 2009-09-25 2011-04-07 Tenox Corp Device for agitating and mixing excavated soil
JP2011153417A (en) * 2010-01-26 2011-08-11 System Keisoku Kk Mixing and agitating device
JP2016145455A (en) * 2015-02-06 2016-08-12 ケミカルグラウト株式会社 Borehole adjustment method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001032662A (en) * 1999-07-21 2001-02-06 Asahi Kiso Kk Earth auger
JP2002276276A (en) * 2001-03-13 2002-09-25 Tomotake Shigemori Excavation bit for ground boring device
JP2003247387A (en) * 2002-02-26 2003-09-05 Kajima Corp Method for controlling direction in horizontal drilling, and drill rod for use therein
JP2005207202A (en) * 2004-01-21 2005-08-04 Sanwa Kizai Co Ltd Bending correction device for excavated hole
JP2009228246A (en) * 2008-03-21 2009-10-08 Travers Corp Drilling and agitation equipment for soil improvement
JP2011069093A (en) * 2009-09-25 2011-04-07 Tenox Corp Device for agitating and mixing excavated soil
JP2011153417A (en) * 2010-01-26 2011-08-11 System Keisoku Kk Mixing and agitating device
JP2016145455A (en) * 2015-02-06 2016-08-12 ケミカルグラウト株式会社 Borehole adjustment method

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