Excavation auger

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

【Technical Field】 【0007】 【0001】 The present invention relates to an excavation auger. 【Background Art】 【0002】 Conventionally, a stirring blade device for excavating and stirring the ground has been proposed. In the stirring blade device described in Patent Document 1 below, an excavation auger is provided which includes an excavation blade at the tip of a rod and an anti-rotation prevention blade provided in the middle of the rod and wider than the width of the excavation blade. Since the width of the anti-rotation prevention blade is wider than the width of the excavation blade at the tip of the rod, the anti-rotation prevention blade does not rotate even when the excavation blade rotates, and it is propelled into the soil. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 56-153013 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the stirring blade device described in Patent Document 1, since the width of the anti-rotation prevention blade is wider than the width of the excavation blade at the tip of the rod, the anti-rotation prevention blade hits the hole wall during excavation, resulting in a decrease in excavation efficiency, so there is room for improvement. <00,00027> In consideration of the above facts, an object of the present invention is to provide an excavation auger that improves excavation efficiency. 【Means for Solving the Problems】 【0006】 The excavation auger according to the first aspect has an excavation blade attached to the tip side of a rotatable rod, and an anti-rotation prevention blade rotatably attached to the rod and smaller than the overhanging width of the excavation blade. 【0007】 According to the drilling auger described in the first embodiment, the overhang width of the anti-rotation wing rotatably attached to the rod of the drilling auger is smaller than the overhang width of the drilling wing. Therefore, when drilling, the anti-rotation blades do not hit the hole wall, and thus do not hinder the drilling operation. As a result, drilling efficiency is improved. Furthermore, since the anti-rotation blades are rotatably attached to the rod, only the excavation blades rotate, generating shear force on the soil mass between the anti-rotation blades and the excavation blades, thereby improving the mixing performance. 【0008】 The drilling auger described in the second embodiment is the drilling auger described in the first embodiment, wherein the anti-rotation wing has a vertical plate attached to at least one of the upper and lower sides of the anti-rotation wing body. 【0009】 According to the drilling auger described in the second embodiment, the anti-rotation blade is fitted with a vertical plate that protrudes from at least one of the upper and lower sides of the anti-rotation blade body. As a result, the anti-rotation blade is securely fixed in the drilled hole by the vertical plate, and the anti-rotation blade does not rotate together with the rod. Therefore, the stirring performance of the drilling auger is further improved. 【0010】 The drilling auger described in the third embodiment is the drilling auger described in the second embodiment, wherein the vertical length of the vertical plate is longer than the vertical length of the drilling blade. 【0011】 According to the drilling auger described in the third embodiment, since the vertical length of the vertical plate is longer than the vertical length of the drilling blade, the resistance between the blade and the plate is increased, and the anti-rotation blade is more securely fixed in the borehole. As a result, the stirring performance of the drilling auger is further improved. [Effects of the Invention] 【0012】 The drilling auger of this disclosure makes it possible to improve drilling efficiency. [Brief explanation of the drawing] 【0013】 [Figure 1] It is a schematic configuration diagram showing an example of an excavation and agitation device equipped with an excavation auger of the first embodiment. [Figure 2] It is a perspective view showing the excavation auger of the first embodiment. [Figure 3] (A) is a plan view showing the rotation prevention wing of the excavation auger of the first embodiment, and (B) is a side sectional view showing the rotation prevention wing of the excavation auger of the first embodiment. [Figure 4] (A) is a plan view showing the rotation prevention wing body, (B) is a side view showing the rotation prevention wing body, and (C) is a side view showing the vertical plate. [Figure 5] It is a side view showing the excavation wing of the excavation auger of the first embodiment. [Figure 6] It is a perspective view showing the excavation auger of the second embodiment. [Figure 7] It is a perspective view showing the excavation auger of the first comparative example. [Figure 8] It is a perspective view showing the excavation auger of the second comparative example. [Figure 9] It is a graph showing the relationship between the excavation torque and the depth of the excavation augers of the first embodiment, the second embodiment, and the first comparative example. 【Embodiments for Carrying Out the Invention】 【0014】 Embodiments of the present invention will be described in detail based on the drawings. In each drawing, those with low relevance to the present invention are omitted from illustration. 【0015】 <First Embodiment> The excavation auger of the first embodiment will be described. 【0016】 [Overall Configuration of the Excavation and Agitation Device] FIG. 1 shows an example of an excavation and agitation device equipped with an excavation auger 10 of the first embodiment. As shown in FIG. 1, the excavation and agitation device 100 is attached to the tip of the arm 104 of the backhoe 102. As an example, the excavation and agitation device 100 is a device for improving the ground by a mechanical agitation method. In FIG. 1, for clarity of the configuration, the excavation and agitation device 100 is shown enlarged with respect to the backhoe 102 and the arm 104, and is different from the actual dimensions. 【0017】 The excavation and agitation 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 arm 104 side in the axial direction, and a vertical rotation part 114 provided at the end (tip part) of the rod 110 on the side opposite to the arm 104 in the axial direction. Further, the excavation and agitation device 100 includes an excavation auger 10 attached to the tip of the rod 110 via the vertical rotation part 114. The excavation and agitation device 100 also includes a rotation part 42 for rotating the rod 12 of the excavation auger 10 around its axis. 【0018】 The rod 110 is attached to the arm 104 via the horizontal rotation part 112. The horizontal rotation part 112 rotates the rod 110 in the horizontal direction at the tip of the arm 104. 【0019】 The vertical rotation part 114 includes a rotation axis 114A arranged in a direction (in this embodiment, a perpendicular direction) intersecting the axial direction of the rod 110 at the tip of the rod 110, and the excavation auger 10 is attached to the rotation axis 114A. The vertical rotation part 114 rotates the excavation auger 10 at the tip part of the rod 110 in the vertical direction (that is, the up and down direction shown by the arrow A in FIG. 1) by the rotation of the rotation axis 114A. As an example, the vertical rotation part 114 rotates the excavation auger 10 arranged along the axial direction of the rod 110 90 degrees to the left and right respectively. Thereby, the excavation auger 10 rotates in a state inclined at a desired angle within a range of up to 180 degrees at the tip of the rod 110. 【0020】 As an example, the drilling auger 10 is a hydraulic auger. The rotating part 42 uses hydraulic pressure to rotate the rod 12 around its axis relative to the shaft part 44 (see Figure 2) which is inserted inside the rod 12. The rotation of the rod 110 causes the drilling auger 10 to rotate around its axis. 【0021】 In the first embodiment, the excavation auger 10 of the excavation and stirring device 100, which is attached to the tip of the arm 104 of the backhoe 102, is driven into the ground 130 to excavate, and a stabilizing material such as cement grout (not shown) is discharged from the tip of the excavation auger 10 to stir and mix it. This improves a desired area of ​​the ground 130. 【0022】 [Configuration of the drilling auger] Figure 2 shows a perspective view of the drilling auger 10 of the first embodiment. As shown in Figure 2, the drilling auger 10 comprises a rotatable rod 12, drilling blades 14 attached to the axial end 12A of the rod 12, and anti-rotation blades 16 rotatably attached to the middle part of the rod 12. Furthermore, the drilling auger 10 is equipped with stirring blades 18 attached to the vertically rotating part 114 (see Figure 1) of the rod 12, rather than the anti-rotation blades 16 in the axial direction. In the first embodiment, in order to make the configuration of the drilling auger 10 easier to understand, the axial direction of the rod 12 of the drilling auger 10 shown in Figures 1 and 2 may be expressed as the vertical direction of the rod 12 or the up and down of the rod 12. 【0023】 (rod) As shown in Figure 2, the rod 12 is configured to rotate around its axis when the rod 110 rotates due to the horizontal rotation part 112 (see Figure 1). The tip 12A of the rod 12 is provided with a pointed portion 22 that protrudes in a roughly triangular shape when viewed from the side. In the first embodiment, the cross-section of the rod 12 in the direction perpendicular to the axial direction is roughly hexagonal, but the shape of the rod 12 can be changed and may be circular or the like. 【0024】 (Drilling blade) As shown in Figures 2, 3(B), and 5, the drilling blade 14 comprises a cylindrical portion 14A attached to the rod 12, and two wing portions 14B and 14C extending radially outward from the cylindrical portion 14A. The cylindrical portion 14A is substantially cylindrical and is joined to the rod 12 by welding or the like. The two wing portions 14B and 14C extend in a direction of approximately 180 degrees with respect to the center of the cylindrical portion 14A. As shown in Figure 2, the two wing portions 14B and 14C are substantially rectangular plates, and the surfaces of the wing portions 14B and 14C are inclined at different angles with respect to the horizontal direction (the direction perpendicular to the axial direction of the rod 12 shown in Figure 2). That is, the surfaces of the wing portions 14B and 14C are arranged in directions that intersect each other. Note that in Figure 3(B), the mounting positions of the drilling blade 14 and the anti-rotation blade 16 on the rod 12 have been changed so that their positions in the width direction align, in order to make the configuration easier to understand. 【0025】 Multiple drilling blades (e.g., bits) 24 are attached to the tip 12A side of the rod 12 in the blade sections 14B and 14C. 【0026】 As shown in Figures 3(B) and 5, the outer diameter of the blades 14B and 14C of the drilling blade 14 is denoted as D1. That is, the outer diameter D1 of the blades 14B and 14C of the drilling blade 14 is the length from the tip of blade 14B to the tip of blade 14C. For example, the outer diameter D1 of the blades 14B and 14C of the drilling blade 14 is approximately 1 m. The vertical length of the drilling blade 14 is denoted as L1. The vertical length L1 of the drilling blade 14 is the dimension of the part excluding the multiple drilling blades 24. The vertical length L1 of the drilling blade 14 will be described later. 【0027】 (Anti-rotation wing) As shown in Figures 2 and 3(A) and (B), the anti-rotation wing 16 comprises a pair of anti-rotation wing bodies 30 mounted above and below the rod 12 in the axial direction, i.e., at positions far apart in the axial direction of the rod 12, and a vertical plate 34 connected to the pair of anti-rotation wing bodies 30. 【0028】 In other words, the anti-rotation wing 16 has vertical plates 34 attached to it that protrude from at least one of the upper and lower sides of the anti-rotation wing body 30. In the first embodiment, the vertical plates 34 protrude above the lower side of the anti-rotation wing body 30 in the vertical direction of the rod 12, and protrude below the upper side of the anti-rotation wing body 30 in the vertical direction of the rod 12. As an example, there are two vertical plates 34. 【0029】 In this embodiment, the pair of anti-rotation wing bodies 30 are substantially the same shape (see Figures 4(A) and (B)). The anti-rotation wing body 30 comprises a cylindrical portion 30A that is rotatably attached to the rod 12, and two wing portions 30B and 30C that extend radially outward from the cylindrical portion 30A. 【0030】 As shown in Figures 3(A) and (B), the cylindrical portion 30A is a substantially cylindrical member, and a bearing 36 is provided inside the cylindrical portion 30A. The bearing 36 ensures that there is almost no friction between the anti-rotation wing body 30 and the rod 12, allowing the anti-rotation wing 16, which is equipped with the anti-rotation wing body 30, to rotate freely relative to the rod 12. 【0031】 As shown in Figures 2 and 3(A) and (B), the two wing portions 30B and 30C extend in a direction approximately 180 degrees from the center of the cylindrical portion 30A. The two wing portions 30B and 30C are substantially rectangular plates, and the surfaces of the wing portions 30B and 30C are arranged along the axial direction of the rod 12. 【0032】 As shown in Figures 2, 3(A), and 4(C), the vertical plate 34 is a plate with a convex shape when viewed from the side. More specifically, the vertical plate 34 comprises a rectangular long plate portion 34A that is long in the axial direction of the rod 12, and a rectangular overhang portion 34B that extends laterally from the middle of the long plate portion 34A (see Figure 4(C)). There are two vertical plates 34 as described above, and one vertical plate 34 is connected to the blade portions 30B of a pair of anti-rotation wing bodies 30 at both ends in the longitudinal direction of the long plate portion 34A (top and bottom of the vertical plate 34 shown in Figure 2). The other vertical plate 34 is connected to the blade portions 30C of a pair of anti-rotation wing bodies 30 at both ends in the longitudinal direction of the long plate portion 34A (top and bottom of the vertical plate 34 shown in Figure 2). The vertical plate 34 is connected to the wing section 30B or wing section 30C by a number of fasteners 38 such as bolts and nuts. 【0033】 As an example, with two vertical plates 34 connected to a pair of anti-rotation wing bodies 30, the radially outer ends of the two wing sections 30B and 30C are aligned with the radially outer edges of the vertical plates 34. Also, the axial (vertical) ends of the rod 12 on the long plate section 34A of the vertical plate 34 are aligned with the upper and lower ends of the pair of anti-rotation wing bodies 30 attached to the rod 12. 【0034】 As shown in Figures 3(A) and (B), the outer diameter of the largest portion of the anti-rotation wing 16 is denoted as D2. In the first embodiment, the outer diameter D2 of the largest portion of the anti-rotation wing 16 is the length from the tip of the blade portion 30B to the tip of the blade portion 30C of the anti-rotation wing body 30, and the length from the edge of one vertical plate 34 to the edge of the other vertical plate 34. For example, the outer diameter D2 of the largest portion of the anti-rotation wing 16 is approximately 0.9 m. 【0035】 In the first embodiment, the outer diameter D2 of the widest part of the anti-rotation wing 16 is smaller than the outer diameter D1 of the blades 14B and 14C of the drilling wing 14. Therefore, the overhang width W2 of the anti-rotation wing 16 from the rod 12 (see Figures 3(B) and 5) is smaller than the overhang width W2 of the drilling wing 14 (see Figure 3). 【0036】 As shown in Figures 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 defined as L2. For example, the axial length L2 of the rod 12 in the long plate portion 34A of the vertical plate 34 is approximately 0.5 m. As an example, the vertical length L2 of the vertical plate 34 is equal to the axial length of the rod 12 of the anti-rotation wing 16. 【0037】 The vertical length L2 of the vertical plate 54 is longer than the vertical length L1 of the digging blade 14. 【0038】 Furthermore, as shown in Figures 2 and 3(B), support portions 40 are provided on both sides of the anti-rotation wing 16 in the axial direction of the rod 12 to support the anti-rotation wing 16 so as to be rotatable relative to the rod 12. The support portion 40 is a cylindrical member and is fixed to the rod 12 by a mounting fixture (not shown). 【0039】 (Agitator blade) As shown in Figure 2, the stirring blade 18 comprises 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 is substantially cylindrical and is joined to the rod 12 by welding or the like. The two blade portions 18B and 18C extend in a direction of approximately 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 (the direction perpendicular to the axial direction of the rod 12 shown in Figure 2). That is, the surfaces of the blade portions 18B and 18C are arranged in directions that intersect each other. 【0040】 For example, the outer diameters of the blade portions 18B and 18C of the stirring blade 18 are larger than the outer diameter D2 of the widest part of the anti-rotation blade 16, but are not limited to this and may be smaller. 【0041】 [Mechanism of Action and Effects] Next, the operation and effects of this embodiment will be described. 【0042】 The drilling auger 10 includes a drilling blade 14 attached to the tip 12A of a rotatable rod 12, and an anti-rotation blade 16 rotatably attached to the rod 12. When drilling into the ground 130 with the drilling auger 10, the drilling blade 14 and the stirring blade 18 rotate as the rod 12 rotates. Since the anti-rotation blade 16 is rotatably attached to the rod 12, the structure ensures that the anti-rotation blade 16 remains fixed to the soil even when the rod 12 rotates. 【0043】 In the drilling auger 10, the overhang width W2 of the anti-rotation wing 16, which is rotatably attached to the rod 12, is smaller than the overhang width W1 of the drilling wing 14, which is also attached to the rod 12. 【0044】 Therefore, as shown in Figure 1, when the drilling auger 10 drills into the ground 130 by rotating the rod 12, the anti-rotation blade 16 does not come into contact with the hole wall 132A of the drilled hole 132, so the anti-rotation blade 16 does not obstruct the drilling operation. As a result, drilling efficiency is improved. Furthermore, since the anti-rotation blade 16 is rotatably attached to the rod 12, only the excavation blade 14 rotates, generating shear force on the soil mass between the anti-rotation blade 16 and the excavation blade 14, thereby improving the mixing performance. 【0045】 Furthermore, in the drilling and stirring device 100 in which the drilling auger 10 rotates in a vertical plane by the vertical rotation section 114, the anti-rotation blades 16 are less likely to get caught on the borehole wall 132A when the drilling auger 10 is rotated in a vertical plane (i.e., when the drilling auger 10 is swung upward). As a result, the stirring performance of the drilling auger 10 is improved. 【0046】 Furthermore, in the drilling auger 10, the anti-rotation wing 16 comprises a pair of anti-rotation wing bodies 30 arranged above and below the rod 12 in the axial direction, and a vertical plate 34 connected to the pair of anti-rotation wing bodies 30. Specifically, the vertical plate 34 protrudes above the lower anti-rotation wing body 30 in the vertical direction of the rod 12, and protrudes below the upper anti-rotation wing body 30 in the vertical direction of the rod 12. 【0047】 Therefore, in the drilling auger 10, the anti-rotation blades 16 are securely fixed in the drilled hole 132 by the vertical plates 34, and the anti-rotation blades 16 do not rotate together with the rod 12. As a result, the mixing performance of the drilling auger 10 is further improved. 【0048】 Furthermore, in the drilling auger 10, the vertical length L2 of the vertical plate 34 is longer than the vertical length L1 of the drilling blade 14. As a result, the resistance between the vertical plate 34 and the drilling blade 14 is increased in the drilling auger 10, and the anti-rotation blade 16 is more securely fixed in the drilled hole 132. This improves the stirring performance of the drilling auger 10. 【0049】 <Second Embodiment> Next, the excavation auger of the second embodiment will be described. Note that components identical to those of the first embodiment described above will be given the same numbers and their descriptions will be omitted. 【0050】 Figure 6 is a perspective view showing the drilling auger 50 of the second embodiment. As shown in Figure 6, the drilling auger 50 is equipped with anti-rotation blades 52 that are rotatably attached to the rod 12. The anti-rotation blades 52 consist of a pair of anti-rotation blade bodies 30 attached to the upper and lower axial directions of the rod 12, and vertical plates 54 connected to the pair of anti-rotation blade bodies 30. As an example, there are two vertical plates 54. In the drilling auger 50 of the second embodiment, the configuration of the vertical plates 54 differs from the configuration of the vertical plates 34 of the drilling auger 10 of the first embodiment. 【0051】 One vertical plate 54 is connected to the blade portion 30B of the pair of anti-rotation wing bodies 30. The other vertical plate 54 is connected to the blade portion 30C of the pair of anti-rotation wing bodies 30. 【0052】 In the second embodiment, the axial length (vertical length) L2 of the rod 12 in the vertical plate 54 is shorter than the axial length (vertical length) L2 of the rod 12 in the long plate portion 34A of the vertical plate 34 in the first embodiment. For example, the axial length L2 of the rod 12 in the vertical plate 54 is about 0.3 m. The vertical length L2 of the vertical plate 54 is equal to the axial length of the rod 12 of the anti-rotation wing 52. The vertical length L2 of the vertical plate 54 is longer than the vertical length L1 of the drilling wing 14 (for example, about 0.25 m). Other configurations of the drilling auger 50 in the second embodiment are the same as those of the drilling auger 10 in the first embodiment. 【0053】 In the drilling auger 50 of the second embodiment, the same operation and effects can be obtained with the same configuration as the drilling auger 10 of the first embodiment. 【0054】 <Verification experiment of anti-rotation wing> Experiments were conducted to verify the effectiveness of the anti-rotation blades 16 and 52 of the drilling augers 10 and 50 of the first and second embodiments. Scale models of the drilling augers 10 and 50 were used in these experiments. Furthermore, for comparison with the drilling augers 10 and 50 of the first and second embodiments, a first comparative example drilling auger 200 shown in Figure 7 and a second comparative example drilling auger 210 shown in Figure 8 were prepared. Scale models of the drilling augers 200 and 210 were also used. Note that for the first comparative example drilling auger 200 and the second comparative example drilling auger 210, the same components as those in the first and second embodiments described above are given the same numbers and their descriptions are omitted. 【0055】 As shown in Figure 7, the drilling auger 200 of the first comparative example comprises a rod 12, a drilling blade 14 attached to the axial end 12A side of the rod 12, and a stirring blade 18 attached to the opposite side of the rod 12 from the drilling blade 14 in the axial direction. The drilling auger 200 of the first comparative example is not provided with anti-rotation blades like those in the first and second embodiments. 【0056】 As shown in Figure 8, the drilling auger 210 of the second comparative example comprises a rod 12, a drilling blade 14 attached to the axial end 12A of the rod 12, and an anti-rotation blade 212 rotatably attached to the middle of the rod 12. Furthermore, the drilling auger 210 comprises a stirring blade 18 attached to the opposite side of the axial end 12A of the rod 12. 【0057】 The anti-rotation wing 212 comprises 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, creating a gap between the cylindrical portion 212A and the rod 12. This allows the anti-rotation wing 212 to be rotatably attached to the rod 12. The two blade portions 212B and 212C extend in a direction approximately 180 degrees from the center of the cylindrical portion 212A. The two blade portions 212B and 212C are substantially rectangular plates, and the surfaces of 212B and 212C are arranged along the axial direction of the rod 12. 【0058】 The outer diameter D3 of the 16 blade sections 212B and 212C of the anti-rotation blade 212 is larger than the outer diameter D1 of the blade sections 14B and 14C of the drilling blade 14. Therefore, the overhang width of the anti-rotation blade 16 from the rod 12 is larger than the overhang width of the drilling blade 14 from the rod 12. For example, the outer diameter D1 of the blade sections 14B and 14C of the drilling blade 14 is 120 mm, and the outer diameter D3 of the 16 blade sections 212B and 212C of the anti-rotation blade 212 is 130 mm. 【0059】 The experimental ground was cohesive soil. In the experiment, the ground was agitated and mixed for a predetermined time using the excavation augers 10 and 50 of the first and second embodiments. Similarly, the ground was agitated and mixed for a predetermined time using the excavation augers 200 and 210 of the first and second comparative examples. 【0060】 Although not shown in the diagram, it was confirmed that when the first comparative example's excavation auger 200 was withdrawn from the ground, the area around the rod 12 was formed into a clod of soil. Similarly, when the second comparative example's excavation auger 210 was withdrawn from the ground, it was confirmed that the area around the rod 12 was formed into a clod of soil. 【0061】 In contrast, when the excavation auger 10 of the first embodiment was withdrawn from the ground, there was little soil adhering to the stirring blade 18, and no soil clumps were observed. From this, it was confirmed that the agitation performance of the excavation auger 10 of the first embodiment does not deteriorate even in cohesive soil. 【0062】 Furthermore, in the second embodiment, when the excavation auger 50 was withdrawn from the ground, there was little soil adhering to the stirring blade 18, and no soil clumps were observed. 【0063】 Figure 9 is a graph showing the relationship between the torque measured during drilling and the depth of the ground for the drilling auger 10 of the first embodiment, the drilling auger 50 of the second embodiment, and the drilling auger 200 of the first comparative example. As shown in Figure 9, the drilling augers 10 and 50 of the first and second embodiments have higher drilling torque compared to the drilling auger 200 of the first comparative example. Furthermore, the drilling auger 10 of the first embodiment, which has a longer vertical length L2 of the vertical plate 34, has higher drilling torque than the drilling auger 50 of the second embodiment, which has a shorter vertical length L2 of the vertical plate 54. In the drilling auger 10 of the first embodiment, it is thought that the longer vertical length L2 of the vertical plate 34 increases the resistance between the anti-rotation blade 16 and the drilling blade 14, resulting in improved mixing performance. 【0064】 <Other> Furthermore, the present invention is not limited to the embodiments described above. 【0065】 In the first and second embodiments, the components of the drilling augers 10 and 50 can be changed without departing from the present invention. For example, in the drilling augers 10 and 50, one stirring blade 18 is provided on the rod 12, but the present invention is not limited thereto, and a configuration with multiple stirring blades 18 is also possible. 【0066】 Furthermore, in the first and second embodiments, if the overhang width W2 of the anti-rotation wings 16 and 52 from the rod 12 is smaller than the overhang width W1 of the excavation wing 14, the dimensions of the overhang width W2 and overhang width W1 may be changed. 【0067】 Furthermore, in the first and second embodiments, the vertical plates 34 and 54 were in contact with the entire vertical region of the blade portions 30B and 30C of the pair of anti-rotation wing bodies 30, but the present invention is not limited to this configuration. For example, the vertical plates 34 and 54 may be in contact with only a portion of the vertical region of the blade portions 30B and 30C of the pair of anti-rotation wing bodies 30. 【0068】 Furthermore, in the first and second embodiments, the anti-rotation wings 16 and 52 are provided with vertical plates 34 and 54 connected to a pair of anti-rotation wing bodies 30 mounted above and below the rod 12, but the present invention is not limited to this configuration. For example, the anti-rotation wing may be configured to have vertical plates attached to at least one of the upper and lower sides of the anti-rotation wing body. For example, one anti-rotation wing body 30 may be provided on the rod 12, and a vertical plate may be provided that extends above the anti-rotation wing body 30, a vertical plate that extends below the anti-rotation wing body 30, or vertical plates that extend on both the upper and lower sides of the anti-rotation wing body 30. 【0069】 In the first and second embodiments, a bearing was provided inside the cylindrical portion 30A of the anti-rotation wing body 30, but the present invention is not limited to this configuration. For example, a gap may be provided between the cylindrical portion and the rod 12, and the cylindrical portion of the anti-rotation wing body 30 may be rotatably attached to the rod 12. 【0070】 In the first and second embodiments, the excavation augers 10 and 50 are configured to rotate vertically 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 in a configuration in which the excavation augers 10 and 50 do not rotate vertically. 【0071】 Furthermore, the present invention can be implemented in various forms without departing from the spirit of the invention. Multiple embodiments and modifications can be combined as appropriate. [Explanation of Symbols] 【0072】 10 Excavation Augers 12 rods 12A tip 14. Excavation blade 16 Anti-rotation wings 30 Anti-rotation wing body 34 vertical boards 50 Excavation Auger 52 Anti-rotation wings 54 vertical boards W1 Overhang width of the drilling wing W2 Overhang width of anti-rotation wing L1 Vertical length of the drilling blade L2 Vertical length of the vertical board

Claims

[Claim 1] A drilling blade attached to the tip of a rotatable rod for excavating the ground, The anti-rotation blade is composed of a main body of the anti-rotation blade that is rotatably mounted on the rod at an upper and lower distance from each other, blade portions that protrude from the anti-rotation blade body and are smaller than the protrusion width of the excavation blade, and vertical plates that are connected to the vertical surfaces of the upper and lower blade portions and agitate the soil mass between them and the excavation blade, A drilling auger. [Claim 2] The drilling auger according to claim 1, wherein a stirring blade is attached to the rod on the opposite side of the drilling blade, sandwiching the anti-rotation blade in the axial direction of the rod.

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