JP2023127788A - Boring auger - Google Patents

Abstract

To provide a boring auger with improved mixing performance.SOLUTION: A boring auger 10 comprises: boring blades 14 attached on a tip part 12A side of a rotatable rod 12; and anti-corotation blades 16 rotatably attached on the rod 12 and smaller than the protrusion width of the boring blades 14.SELECTED DRAWING: Figure 2

Description

The present invention relates to a drilling auger.

Conventionally, stirring blade devices for excavating and stirring the ground have been proposed. In the stirring blade device described in Patent Document 1 below, an excavation auger is provided that includes an excavation blade at the tip of a rod and a co-rotation prevention blade that is provided in the middle of the rod and is wider than the width of the excavation blade. ing. In the excavation auger, the width of the anti-rotation blade is wider than the width of the excavation blade at the tip of the rod, so even if the excavation blade rotates, the anti-rotation blade does not rotate and is propelled into the soil.

Japanese Unexamined Patent Publication No. 56-153013

In the stirring blade device described in Patent Document 1, the width of the anti-rotation blade is wider than the width of the excavation blade at the tip of the rod, so the anti-rotation blade hits the hole wall during excavation, reducing excavation efficiency. There is room for improvement.

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide an excavation auger that improves excavation efficiency.

The excavation auger according to the first aspect includes: an excavation wing attached to the tip side of a rotatable rod; and an anti-rotation wing rotatably attached to the rod and smaller than the extension width of the excavation wing. have

According to the excavation auger according to the first aspect, the extension width of the co-rotation prevention wing rotatably attached to the rod of the excavation auger is smaller than the extension width of the excavation wing.
Therefore, when drilling a hole, the anti-rotation blade does not hit the hole wall of the drilling hole, so the anti-rotation blade does not become an obstacle to the drilling work. Therefore, excavation efficiency is improved.
In addition, since the co-rotation prevention blade is rotatably attached to the rod, only the excavation blade can rotate to generate shear force on the soil mass between the co-rotation prevention blade and the excavation blade, which can agitate the soil. Improved performance.

The excavation auger according to the second aspect is the excavation auger according to the first aspect, wherein the co-rotation prevention blade is attached with a vertical plate projecting from at least one of above and below the co-rotation prevention blade body. .

According to the excavation auger according to the second aspect, since the counter-rotation prevention blade is attached with a vertical plate projecting from at least one of the upper and lower sides of the counter-rotation prevention blade body, the vertical plate is attached to the counter-rotation prevention blade. is securely fixed in the excavation hole, and the co-rotation prevention wing does not rotate with the rod. Therefore, the agitation performance of the excavation auger is further improved.

In the excavation auger according to the third aspect, in the excavation auger according to the second aspect, the vertical length of the vertical plate is longer than the length of the excavation blade in the vertical direction.

According to the excavation auger according to the third aspect, since the length of the vertical plate in the vertical direction is longer than the length of the excavation blade in the vertical direction, the resistance between the vertical plate and the excavation blade increases, and the anti-rotation blade It is more securely fixed in the hole. Therefore, the agitation performance of the excavation auger is further improved.

According to the excavation auger of the present disclosure, it is possible to improve excavation efficiency.

1 is a schematic configuration diagram showing an example of an excavation agitation device including an excavation auger according to a first embodiment. It is a perspective view showing an excavation auger of a 1st embodiment. (A) is a plan view showing a co-rotation prevention wing of the excavation auger of the first embodiment, and (B) is a side sectional view showing the co-rotation prevention wing of the excavation auger of the first embodiment. (A) is a plan view showing the co-rotation prevention wing main body, (B) is a side view showing the co-rotation prevention wing main body, and (C) is a side view showing the vertical plate. It is a side view showing the excavation blade of the excavation auger of the first embodiment. It is a perspective view showing an excavation auger of a 2nd embodiment. It is a perspective view showing an excavation auger of a first comparative example. It is a perspective view which shows the excavation auger of a 2nd comparative example. It is a graph which shows the relationship between the excavation torque of the excavation auger of 1st Embodiment, 2nd Embodiment, and 1st comparative example and depth.

Embodiments of the present invention will be described in detail based on the drawings. In each drawing, things that are less relevant to the present invention are omitted from illustration.

<First embodiment>
The excavation auger of the first embodiment will be described.

[Overall configuration of excavation stirring device]
FIG. 1 shows an example of an excavation agitation device including an excavation auger 10 according to the first embodiment. As shown in FIG. 1, the excavation stirring device 100 is attached to the tip of an arm 104 of a backhoe 102. As an example, the excavation stirring device 100 is a device that improves the ground using a mechanical stirring method. In addition, in FIG. 1, in order to make the configuration easier to understand, the excavation stirring device 100 is shown larger than the backhoe 102 and the arm 104, and the dimensions differ from the actual size.

The excavation stirring device 100 includes a rod 110 extending in the axial direction, a horizontal rotation part 112 provided at the end of the rod 110 on the axial arm 104 side, and a horizontal rotating part 112 provided at the end of the rod 110 on the axial arm 104 side. It includes a vertical rotation part 114 provided at the end (tip part). Further, the excavation agitation device 100 includes an excavation auger 10 attached to the tip of the rod 110 via a vertical rotating section 114. Further, the excavation agitation device 100 includes a rotating part 42 that rotates the rod 12 of the excavation auger 10 around an axis.

Rod 110 is attached to arm 104 via horizontal rotation portion 112 . The horizontal rotation unit 112 rotates the rod 110 in the horizontal direction at the tip of the arm 104.

The vertical rotation unit 114 includes a rotation shaft 114A disposed at the distal end of the rod 110 in a direction intersecting the axial direction of the rod 110 (in the present embodiment, a direction perpendicular to the axis). 10 is installed. The vertical rotation unit 114 rotates the excavation auger 10 at the tip of the rod 110 in the vertical direction (that is, in the vertical direction shown by arrow A in FIG. 1) by rotating the rotation shaft 114A. As an example, the vertical rotation unit 114 rotates the excavation auger 10 arranged along the axial direction of the rod 110 by 90 degrees in the left and right directions. As a result, the excavating auger 10 rotates at the tip of the rod 110 while being inclined at a desired angle within a range of 180 degrees at maximum.

As an example, drilling auger 10 is a hydraulic auger. The rotating part 42 rotates the rod 12 around an axis with respect to a shaft part 44 (see FIG. 2) inserted into the inside of the rod 12 by hydraulic pressure. The rotation of the rod 110 causes the excavation auger 10 to rotate around the axis.

In the first embodiment, the excavation auger 10 of the excavation agitation device 100 attached to the tip of the arm 104 of the backhoe 102 penetrates into the ground 130 and excavates, and at the same time, a stabilizing material such as cement milk (not shown) is inserted from the tip of the excavation auger 10. (omitted) and stir and mix. This improves the desired area of the ground 130.

[Drilling auger configuration]
FIG. 2 shows a perspective view of the excavation auger 10 of the first embodiment. As shown in FIG. 2, the excavation auger 10 includes a rotatable rod 12, an excavation blade 14 attached to the axial tip end 12A side of the rod 12, and a rotatable attachment to the middle part of the rod 12. Co-rotation prevention blades 16 are provided. Further, the excavation auger 10 includes a stirring blade 18 that is attached to the vertical rotating portion 114 (see FIG. 1) rather than the co-rotation prevention blade 16 in the axial direction of the rod 12. In the first embodiment, in order to make the configuration of the excavation auger 10 easier to understand, the axial direction of the rod 12 of the excavation auger 10 shown in FIGS. 1 and 2 may be expressed as the vertical direction of the rod 12 or the vertical direction of the rod 12. .

(rod)
As shown in FIG. 2, the rod 12 is configured to rotate around an axis when the rod 110 is rotated by the horizontal rotation section 112 (see FIG. 1). A tip portion 12A of the rod 12 is provided with a pointed portion 22 protruding from the tip side in a substantially triangular shape when viewed from the side. In the first embodiment, the cross section of the rod 12 in the direction orthogonal to the axial direction has a substantially hexagonal shape, but the shape of the rod 12 can be changed and may be circular or the like.

(Drilling wing)
As shown in FIGS. 2, 3(B), and 5, the excavating blade 14 includes a cylindrical portion 14A attached to the rod 12, and two blade portions 14B and 14C extending radially outward from the cylindrical portion 14A. , is equipped with. The cylindrical portion 14A has a substantially cylindrical shape and is joined to the rod 12 by welding or the like. The two blade portions 14B and 14C extend in a direction of about 180 degrees with respect to the center of the cylindrical portion 14A. As shown in FIG. 2, the two blade portions 14B and 14C are substantially rectangular plates, and the surfaces of the blade portions 14B and 14C are oriented horizontally (in a direction perpendicular to the axial direction of the rod 12 shown in FIG. 2). are tilted at different angles. That is, the surfaces of the blade portions 14B and 14C are arranged in directions that intersect with each other. In addition, in FIG. 3(B), in order to make the configuration easier to understand, the mounting positions of the excavating blade 14 and the co-rotation prevention blade 16 with respect to the rod 12 are changed so that the positions in the width direction match.

A plurality of digging blades (for example, bits) 24 are attached to the blade portions 14B and 14C on the tip end 12A side of the rod 12.

As shown in FIGS. 3(B) and 5, the outer diameter of the blade portions 14B and 14C of the excavating blade 14 is set to D1. That is, the outer diameter D1 of the blade portions 14B and 14C of the excavating blade 14 is the length from the tip of the blade portion 14B to the tip of the blade portion 14C. For example, the outer diameter D1 of the blade portions 14B and 14C of the excavating blade 14 is approximately 1 m. Further, the length of the excavation blade 14 in the vertical direction is assumed to be L1. The vertical length L1 of the excavating blade 14 is the dimension of the portion excluding the plurality of excavating blades 24. The vertical length L1 of the excavation blade 14 will be described later.

(Spring prevention wing)
As shown in FIGS. 2 and 3(A) and (B), the co-rotation prevention blades 16 are attached to a pair of co-rotation prevention blades attached at upper and lower positions in the axial direction of the rod 12, that is, at separate positions in the axial direction of the rod 12. It includes a prevention wing body 30 and a vertical plate 34 connected to the pair of co-rotation prevention wing bodies 30.

That is, the co-rotation prevention blade 16 is attached with a vertical plate 34 that projects from at least one of the upper and lower sides of the co-rotation prevention blade main body 30. In the first embodiment, the vertical plate 34 protrudes above the co-rotation prevention blade body 30 on the lower side of the rod 12 in the vertical direction, and extends below the co-rotation prevention blade body 30 on the upper side of the rod 12 in the vertical direction. It's sticking out. As an example, there are two vertical plates 34.

In this embodiment, the pair of co-rotation prevention blade bodies 30 have substantially the same shape (see FIGS. 4(A) and 4(B)). The co-rotation prevention blade body 30 includes a cylindrical portion 30A rotatably attached to the rod 12, and two blade portions 30B and 30C extending radially outward from the cylindrical portion 30A.

As shown in FIGS. 3A and 3B, the cylindrical portion 30A is a substantially cylindrical member, and a bearing 36 is provided inside the cylindrical portion 30A. The bearing 36 creates a state in which almost no friction occurs between the co-rotation prevention blade body 30 and the rod 12, and the co-rotation prevention blade 16 provided with the co-rotation prevention blade body 30 can freely rotate with respect to the rod 12.

As shown in FIG. 2 and FIGS. 3A and 3B, the two blade portions 30B and 30C extend in a direction of approximately 180 degrees with respect to the center of the cylindrical portion 30A. The two blade portions 30B and 30C are substantially rectangular plates, and the surfaces of the blade portions 30B and 30C are arranged along the axial direction of the rod 12.

As shown in FIGS. 2, 3(A), and 4(C), the vertical plate 34 is a plate having a convex shape when viewed from the side. More specifically, the vertical plate 34 includes a rectangular long plate part 34A that is long in the axial direction of the rod 12, and a rectangular projecting part 34B that extends in the horizontal direction from the middle part of the long plate part 34A. (See Figure 4(C)). There are two vertical plates 34 as described above, and one vertical plate 34 has a pair of co-rotation prevention blades at both ends of the long plate portion 34A in the longitudinal direction (top and bottom of the vertical plate 34 shown in FIG. 2). It is connected to the blade portion 30B of the main body 30. The other vertical plate 34 is connected to the blade portions 30C of the pair of co-rotation prevention blade bodies 30 at both ends in the longitudinal direction of the long plate portion 34A (upper and lower sides of the vertical plate 34 shown in FIG. 2). The vertical plate 34 is connected to the blade portion 30B or the blade portion 30C by a plurality of fittings 38 such as bolts and nuts.

As an example, in a state where two vertical plates 34 are connected to a pair of co-rotation prevention blade bodies 30, the radially outer ends of the two blade parts 30B and 30C and the radially outer edge of the vertical plate 34 are all in place. Further, both ends of the long plate portion 34A of the vertical plate 34 in the axial direction (vertical direction) of the rod 12 are aligned with the upper and lower ends of the pair of co-rotation prevention wing bodies 30 attached to the rod 12. .

As shown in FIGS. 3A and 3B, the outer diameter of the maximum portion of the co-rotation prevention blade 16 is set to D2. In the first embodiment, the outer diameter D2 of the maximum part of the co-rotation prevention blade 16 is the length from the tip of the blade part 30B of the co-rotation prevention blade main body 30 to the tip of the blade part 30C, and the length of the one vertical plate 34. This is the length from the edge to the edge of the other vertical plate 34. For example, the outer diameter D2 of the maximum portion of the co-rotation prevention blade 16 is about 0.9 m.

In the first embodiment, the outer diameter D2 of the maximum portion of the co-rotation prevention blade 16 is smaller than the outer diameter D1 of the blade portions 14B and 14C of the excavation blade 14. Therefore, the overhang width W2 of the co-rotation prevention blade 16 from the rod 12 (see FIGS. 3(B) and 5) is smaller than the overhang width W2 of the excavation blade 14 (see FIG. 3).

As shown in FIGS. 3(B) and 4(C), in the first embodiment, the axial length (vertical length) of the rod 12 in the long plate portion 34A of the vertical plate 34 is L2. . For example, the length L2 in the axial direction of the rod 12 in the long plate portion 34A of the vertical plate 34 is about 0.5 m. As an example, the length L2 of the vertical plate 34 in the vertical direction is equal to the length of the rod 12 of the co-rotation prevention blade 16 in the axial direction.

The length L2 of the vertical plate 54 in the vertical direction is longer than the length L1 of the excavation blade 14 in the vertical direction.

Further, as shown in FIGS. 2 and 3(B), on both sides of the co-rotation prevention blade 16 in the axial direction of the rod 12, there are supporting parts 40 that support the co-rotation prevention blade 16 so as to be rotatable with respect to the rod 12. is provided. The support portion 40 is a cylindrical member, and is fixed to the rod 12 with a fixture (not shown).

(stirring blade)
As shown in FIG. 2, the stirring blade 18 includes a cylindrical portion 18A attached to the rod 12, and two blade portions 18B and 18C extending radially outward from the cylindrical portion 18A. The cylindrical portion 18A has a substantially cylindrical shape and is joined to the rod 12 by welding or the like. The two blade portions 18B and 18C extend in a direction of about 180 degrees with respect to the center of the cylindrical portion 18A. The two blade portions 18B and 18C are substantially rectangular plates, and the surfaces of the blade portions 18B and 18C are inclined at different angles with respect to the horizontal direction (direction perpendicular to the axial direction of the rod 12 shown in FIG. 2). ing. That is, the surfaces of the blade portions 18B and 18C are arranged in directions that intersect with each other.

As an example, the outer diameter of the blade portions 18B and 18C of the stirring blade 18 is larger than the outer diameter D2 of the maximum portion of the co-rotation prevention blade 16, but is not limited thereto and may be smaller.

[Action and effect]
Next, the functions and effects of this embodiment will be explained.

The excavation auger 10 includes an excavation blade 14 attached to the tip 12A side of a rotatable rod 12, and a co-rotation prevention blade 16 rotatably attached to the rod 12. In the drilling auger 10, when drilling a hole in the ground 130, the rotation of the rod 12 causes the drilling blades 14 and stirring blades 18 to rotate. Since the co-rotation prevention blade 16 is rotatably attached to the rod 12, the co-rotation prevention blade 16 is structured to be fixed to the soil even if the rod 12 rotates.

In the excavation auger 10, the extension width W2 of the co-rotation prevention blade 16 rotatably attached to the rod 12 is smaller than the extension width W1 of the excavation blade 14 attached to the rod 12.

Therefore, as shown in FIG. 1, in the drilling auger 10, when drilling a hole in the ground 130 by rotating the rod 12, the co-rotation prevention blade 16 does not hit the hole wall 132A of the excavation hole 132, so the co-rotation prevention blade 16 does not become an obstacle to drilling work. Therefore, excavation efficiency is improved.
Further, since the co-rotation prevention blade 16 is rotatably attached to the rod 12, only the excavation blade 14 rotates to generate a shearing force in the soil mass between the co-rotation prevention blade 16 and the excavation blade 14. This improves stirring performance.

In addition, in the excavation agitation device 100 in which the excavation auger 10 is rotated in a vertical plane by the vertical rotation unit 114, when the excavation auger 10 is rotated in the vertical plane (that is, when the excavation auger 10 is swung upward), the The anti-rotation blade 16 is less likely to get caught on the hole wall 132A. Therefore, the stirring performance of the excavation auger 10 is improved.

Further, in the excavation auger 10, the co-rotation prevention blades 16 include a pair of co-rotation prevention blade bodies 30 arranged above and below in the axial direction of the rod 12, and a vertical plate 34 connected to the pair of co-rotation prevention blade bodies 30. It is equipped with. That is, the vertical plate 34 overhangs above the co-rotation prevention blade body 30 on the lower side of the rod 12 in the vertical direction, and extends below the co-rotation prevention blade body 30 on the upper side of the rod 12 in the vertical direction.

Therefore, in the excavation auger 10, the co-rotation prevention blade 16 is reliably fixed in the excavation hole 132 by the vertical plate 34, and the co-rotation prevention blade 16 does not rotate with the rod 12. Therefore, the stirring performance of the excavation auger 10 is further improved.

Further, in the excavation auger 10, the length L2 of the vertical plate 34 in the vertical direction is longer than the length L1 of the excavation blade 14 in the vertical direction. Therefore, in the excavation auger 10, the resistance between the vertical plate 34 and the excavation blade 14 increases, and the co-rotation prevention blade 16 is more reliably fixed within the excavation hole 132. Therefore, the stirring performance of the excavation auger 10 is further improved.

<Second embodiment>
Next, an excavation auger according to a second embodiment will be described. Note that the same components as those in the first embodiment described above are given the same numbers and the description thereof will be omitted.

FIG. 6 is a perspective view showing an excavation auger 50 according to the second embodiment. As shown in FIG. 6, the excavation auger 50 includes a co-rotation prevention wing 52 rotatably attached to the rod 12. The co-rotation prevention blade 52 includes a pair of co-rotation prevention blade bodies 30 attached above and below in the axial direction of the rod 12, and a vertical plate 54 connected to the pair of co-rotation prevention blade bodies 30. As an example, there are two vertical plates 54. In the excavation auger 50 of the second embodiment, the configuration of the vertical plate 54 is different from the configuration of the vertical plate 34 of the excavation auger 10 of the first embodiment.

One vertical plate 54 is connected to the blade portions 30B of the pair of co-rotation prevention blade bodies 30. The other vertical plate 54 is connected to the blade portions 30C of the pair of co-rotation prevention blade bodies 30.

In the second embodiment, the axial length (vertical length) L2 of the rod 12 in the vertical plate 54 is the axial length of the rod 12 in the long plate portion 34A of the vertical plate 34 in the first embodiment. (Length in vertical direction) shorter than L2. For example, the length L2 of the rod 12 in the vertical plate 54 in the axial direction is about 0.3 m. The length L2 of the vertical plate 54 in the vertical direction is equal to the length of the rod 12 of the co-rotation prevention blade 52 in the axial direction. The length L2 of the vertical plate 54 in the vertical direction is longer than the length L1 of the excavation blade 14 in the vertical direction (for example, about 0.25 m). The other configuration of the excavation auger 50 of the second embodiment is the same as that of the excavation auger 10 of the first embodiment.

The excavation auger 50 of the second embodiment has the same configuration as the excavation auger 10 of the first embodiment, so that the same operations and effects can be obtained.

<Verification experiment of anti-rotation wing>
An experiment was conducted to verify the effects of the co-rotation prevention blades 16 and 52 of the excavation augers 10 and 50 of the first and second embodiments. In this experiment, scale models of the drilling augers 10 and 50 are used. In addition, in this experiment, in order to compare with the drilling augers 10 and 50 of the first and second embodiments, a drilling auger 200 of a first comparative example shown in FIG. 7 and a drilling auger 210 of a second comparative example shown in FIG. prepared. Drilling augers 200 and 210 also use scale models. In addition, in the excavation auger 200 of the first comparative example and the excavation auger 210 of the second comparative example, the same components as those of the first and second embodiments described above are given the same numbers and the description thereof will be omitted.

As shown in FIG. 7, the excavation auger 200 of the first comparative example includes a rod 12, an excavation blade 14 attached to the axial end portion 12A side of the rod 12, and an excavation blade 14 attached to the axial direction of the rod 12. and a stirring blade 18 attached to the opposite side. The excavation auger 200 of the first comparative example is not provided with co-rotation prevention wings like the first and second embodiments.

As shown in FIG. 8, the excavation auger 210 of the second comparative example includes a rod 12, an excavation wing 14 attached to the axial tip end 12A side of the rod 12, and an excavation blade 14 rotatably attached to the intermediate portion of the rod 12. The rotation prevention wing 212 is provided with a rotation prevention wing 212. Further, the excavation auger 210 includes a stirring blade 18 attached to the opposite side of the axial tip portion 12A of the rod 12.

The co-rotation prevention blade 212 includes a cylindrical portion 212A and two blade portions 212B and 212C extending radially outward from the cylindrical portion 212A. The inner diameter of the cylindrical portion 212A is larger than the outer diameter of the rod 12, and there is a gap between the cylindrical portion 212A and the rod 12. Thereby, the co-rotation prevention blade 212 is rotatably attached to the rod 12. The two blade portions 212B and 212C extend in a direction of about 180 degrees with respect to the center of the cylindrical portion 212A. The two blade portions 212B and 212C are substantially rectangular plates, and the surfaces of the blade portions 212B and 212C are arranged along the axial direction of the rod 12.

The outer diameter D3 of the 16 blade parts 212B and 212C of the co-rotation prevention blade 212 is larger than the outer diameter D1 of the blade parts 14B and 14C of the excavation blade 14. Therefore, the width of the anti-rotation blade 16 extending from the rod 12 is larger than the width of the digging blade 14 extending from the rod 12. As an example, the outer diameter D1 of the blade parts 14B and 14C of the excavating blade 14 is 120 mm, and the outer diameter D3 of the 16 blade parts 212B and 212C of the co-rotation prevention blade 212 is 130 mm.

The ground for the experiment was clayey soil. In the experiment, the ground was stirred and mixed for a predetermined period of time using the excavation augers 10 and 50 of the first and second embodiments. Similarly, the ground was stirred and mixed for a predetermined period of time using the excavation augers 200 and 210 of the first and second comparative examples.

Although not shown, it was confirmed that the excavation auger 200 of the first comparative example had a clod-like shape around the rod 12 when it was pulled out from the ground. Further, it was confirmed that the excavation auger 210 of the second comparative example also had a clod-like shape around the rod 12 when it was pulled out from the ground.

On the other hand, in the excavation auger 10 of the first embodiment, when the extraction from the ground was completed, there was little soil attached to the stirring blades 18, and no soil clods were observed. From this, it was confirmed that in the excavation auger 10 of the first embodiment, the stirring performance does not deteriorate even in a sticky ground.

Also, in the excavation auger 50 of the second embodiment, when the extraction from the ground was completed, there was little soil adhering to the stirring blades 18, and no soil clods were observed.

FIG. 9 is a graph showing the relationship between the torque measured during excavation of the excavation auger 10 of the first embodiment, the excavation auger 50 of the second embodiment, and the excavation auger 200 of the first comparative example and the depth of the ground. As shown in FIG. 9, the excavation augers 10 and 50 of the first and second embodiments have higher excavation torque than the excavation auger 200 of the first comparative example. Further, the excavation auger 10 of the first embodiment in which the length L2 of the vertical plate 34 is long in the vertical direction has a higher excavation torque than the excavation auger 50 of the second embodiment in which the length L2 in the vertical direction of the vertical plate 54 is short. expensive. In the excavation auger 10 of the first embodiment, it is thought that because the length L2 of the vertical plate 34 in the vertical direction is long, the resistance between the co-rotation prevention blade 16 and the excavation blade 14 increases, and the stirring performance increases. .

<Others>
Note that the present invention is not limited to the above embodiments.

In the first and second embodiments, the constituent members of the excavating augers 10 and 50 can be changed without departing from the invention. For example, in the excavation augers 10 and 50, one stirring blade 18 is provided on the rod 12, but the present invention is not limited thereto, and may be configured to include a plurality of stirring blades 18.

Further, in the first and second embodiments, if the overhang width W2 of the co-rotation prevention blades 16 and 52 from the rod 12 is smaller than the overhang width W1 of the excavation blade 14, the overhang width W2 and the overhang width W1 are Dimensions may be changed.

Further, in the first and second embodiments, the vertical plates 34 and 54 were in contact with the entire area in the vertical direction of the blade portions 30B and 30C of the pair of co-rotation prevention blade bodies 30, but the present invention has this configuration. It is not limited. For example, the configuration may be such that the vertical plates 34 and 54 contact a portion of the blade portions 30B and 30C of the pair of co-rotation prevention wing bodies 30 in the vertical direction.

Further, in the first and second embodiments, the co-rotation prevention blades 16, 52 are provided with vertical plates 34, 54 connected to a pair of co-rotation prevention blade bodies 30 attached above and below the rod 12. However, the present invention is not limited to this configuration. For example, the counter-rotation prevention wing may have a configuration in which a vertical plate is attached to at least one of the upper and lower sides of the counter-rotation prevention wing body. For example, the rod 12 is provided with one counter-rotation prevention wing body 30, and a vertical plate extending above the counter-rotation prevention wing body 30, a vertical plate extending below the counter-rotation prevention wing body 30, or a counter-rotation prevention wing main body is provided. A configuration may also be adopted in which vertical plates projecting from both the upper and lower sides of 30 are provided.

In the first and second embodiments, a bearing is provided inside the cylindrical portion 30A of the co-rotation prevention blade body 30, but the present invention is not limited to this configuration. For example, a configuration may be adopted in which a gap is provided between the cylindrical portion and the rod 12, and the cylindrical portion of the co-rotation prevention wing body 30 is rotatably attached to the rod 12.

In the first and second embodiments, the excavation augers 10 and 50 are configured to rotate in the vertical direction by the vertical rotation unit 114, but the present invention is not limited to this configuration. For example, the present invention can be applied even to a configuration in which the excavation augers 10 and 50 do not rotate in the vertical direction.

Furthermore, the invention may be implemented in various ways without departing from the spirit of the invention. A plurality of embodiments, modifications, etc. can be implemented in combination as appropriate.

10 Excavation auger 12 Rod 12A Tip part 14 Excavation blade 16 Co-rotation prevention blade 30 Co-rotation prevention blade main body 34 Vertical plate 50 Excavation auger 52 Co-rotation prevention blade 54 Vertical plate W1 Extrusion width of excavation blade W2 Extrusion width of co-rotation prevention blade L1 Length in the vertical direction of the digging blade L2 Length in the vertical direction of the vertical plate

Claims (3)

a digging wing attached to the tip side of the rotatable rod;
a co-rotation prevention blade rotatably attached to the rod and smaller than the extension width of the excavation blade;
Drilling auger with. The excavation auger according to claim 1, wherein the co-rotation prevention blade is provided with a vertical plate extending from at least one of above and below the co-rotation prevention blade body. The excavation auger according to claim 2, wherein the vertical length of the vertical plate is longer than the length of the excavation blade in the vertical direction.