Ground improvement device

Abstract

To provide a ground improvement device capable of perform excavation works by transmitting rotational force to a rotational body of a multi-direction rotational shaft without using gears.SOLUTION: A ground improvement device is provided with: a rotation driving device rotating around a first direction as an axis; a transmission support mechanism extending in a second direction orthogonal to the first direction to transmit rotational force of the rotation driving device; a first rotation axis mechanism supported on the transmission support mechanism and capable of rotating around the first direction as an axis; a plurality of first rotation rod-like members radially extending from a rotation axis of the first rotation axis mechanism; a second rotation axis mechanism supported on the transmission support mechanism and capable of rotating around the second direction as an axis; and a plurality of second rotational rod members radially extending from a rotation axis of the second rotation axis mechanism. The second rotation rod-like members engage with the first rotation rod-like members, and the second rotation rod-like members rotate through rotation of the first rotation rod-like members.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a ground improvement device that excavates and mixes the ground, and in particular to a technology for effectively improving the ground using a rotary drive device and a plurality of rotary shaft mechanisms. [Background technology]

[0002] Conventionally, ground improvement equipment has been widely used to excavate and improve the ground by rotating the ground. Most of these equipments usually use a single rotating shaft to rotate an excavation element (rotor) or the like to excavate.

[0003] However, this method has the problem of low excavation efficiency and difficulty in achieving uniform ground improvement. In particular, when the soil is highly viscous, the excavated soil rotates with the rotation of the excavator blade, resulting in insufficient mixing, which can lead to the formation of an unevenly improved column, and reduced improvement efficiency.

[0004] To prevent these problems, a ground improvement device equipped with anti-corotation blades has been proposed. For example, Patent Document 1 discloses a device equipped with an excavation blade installed symmetrically with respect to a center axis, at least one lateral rotor installed above the excavation blade, and an anti-corotation blade installed symmetrically between the excavation blade and the lateral rotor and extending radially outward beyond the excavation blade and the lateral rotor.

[0005] The anti-rotation blades are longer than the drilling blades and are attached to the drilling rod so that they can rotate freely, so that they come to a standstill when they encounter resistance from the ground surrounding the drilling hole, improving the efficiency of soil excavation and allowing the solidification material slurry to be mixed well. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-11444 Summary of the Invention [Problem to be solved by the invention]

[0007] In the soil improvement device described in Patent Document 1, the rotational driving force is transmitted by gears, and the excavation blades and horizontal rotors are rotated together to prevent the soil from rotating together, thereby shearing and mixing the excavated soil mass. However, because these devices use gears to transmit the rotational driving force, high precision is required in the manufacture and assembly of the gears, which increases the manufacturing costs.

[0008] Furthermore, wear and tear on various parts during use makes it difficult to maintain high precision over long periods of time, and gears are prone to wear and tear, increasing the frequency of maintenance.

[0009] The present invention has been proposed to solve the above problems, and aims to provide a ground improvement device that can perform excavation by transmitting rotational force to a rotating body of a multi-directional rotating shaft without using gears. [Means for solving the problem]

[0010] (1) A ground improvement device includes a rotary drive device that rotates around an axis in a first direction, a transmission support mechanism that extends in a second direction perpendicular to the first direction and transmits the rotational force of the rotary drive device, a first rotating shaft mechanism that is supported by the transmission support mechanism and can rotate around an axis in the first direction, a plurality of first rotating rod-shaped members that extend radially from the rotation axis of the first rotating shaft mechanism, a second rotating shaft mechanism that is supported by the transmission support mechanism and can rotate around an axis in the second direction, and a plurality of second rotating rod-shaped members that extend radially from the rotation axis of the second rotating shaft mechanism, wherein the second rotating rod-shaped members are engaged with the first rotating rod-shaped member, and the second rotating rod-shaped member rotates as the first rotating rod-shaped member rotates.

[0011] This ground improvement device is equipped with a first rotating shaft mechanism that rotates around a first direction as its rotation axis, a second rotating shaft mechanism that rotates in a second direction perpendicular to the first direction, a first rotating rod-shaped member that rotates in response to the rotation of the first rotating shaft mechanism, and a second rotating rod-shaped member that rotates in response to the rotation of the second rotating shaft mechanism, and is capable of performing excavation by rotating around two axes.

[0012] At this time, the second rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, so excavation can be performed efficiently, and the ground improvement device does not require gears because it rotates on two axes. This eliminates gear wear and tear and reduces maintenance frequency.

[0013] (2) The ground improvement device further includes a third rotating shaft mechanism extending in a third direction intersecting the second direction and rotatable about an axis in the third direction, and a plurality of third rotating rod-shaped members extending radially from the rotation axis of the third rotating shaft mechanism, the third rotating rod-shaped members engaging with the first rotating rod-shaped members, and the third rotating rod-shaped members rotating as the first rotating rod-shaped members rotate.

[0014] This ground improvement device further includes a third rotating shaft mechanism that rotates around a rotation axis in a third direction, and a third rotating rod-shaped member that rotates in response to the rotation of the third rotating shaft mechanism, allowing for three-axis rotation for excavation. Because the third rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, the ground improvement device does not require gears for three-axis rotation, even though it can excavate efficiently. This eliminates gear wear and tear and reduces the frequency of maintenance.

[0015] (3) The ground improvement device further includes a fourth rotating shaft mechanism that extends in a fourth direction different from the third direction and intersecting the second direction, and that is rotatable around the fourth direction as an axis, and a plurality of fourth rotating rod-shaped members that extend radially from the rotation axis of the fourth rotating shaft mechanism, and the fourth rotating rod-shaped members engage with the first rotating rod-shaped members, and the rotation of the first rotating rod-shaped members causes the fourth rotating rod-shaped members to rotate.

[0016] This ground improvement device further includes a fourth rotating shaft mechanism that rotates around a fourth direction as its rotation axis, and a fourth rotating rod-shaped member that rotates in response to the rotation of the fourth rotating shaft mechanism, allowing for four-axis rotation for excavation. Because the fourth rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, the ground improvement device does not require gears for four-axis rotation, even though it can excavate efficiently. This eliminates gear wear and damage and reduces the frequency of maintenance.

[0017] (4) The ground improvement device includes a fifth rotating shaft mechanism supported by the transmission support mechanism on the opposite side of the second rotating shaft mechanism across the first rotating shaft mechanism in the second direction and rotatable around an axis in the first direction, and a plurality of rotary excavation members extending radially around the rotation axis of the fifth rotating shaft mechanism, and the fifth rotating shaft mechanism rotates by the rotational force of the rotary drive device.

[0018] This ground improvement device further includes a fifth rotating shaft mechanism above the first rotating shaft mechanism, and the rotary excavation member attached to the fifth rotating shaft mechanism allows for two-stage excavation. This allows the soil excavated by the second, third, and fourth rotating shaft mechanisms at the tip to be further excavated in two stages by the first and fifth rotating shaft mechanisms, making it possible to handle deep excavations.

[0019] (5) The ground improvement device includes a plurality of rotary excavation members extending radially from the rotation axis of the first rotary shaft mechanism. This ground improvement device can improve excavation efficiency by including rotary excavation members in the first rotary shaft mechanism in addition to the first rotating rod-shaped member.

[0020] (6) A rotary drive device attached to the base machine and rotating around an axis in a first direction; a transmission support mechanism extending in a second direction perpendicular to the first direction and transmitting the rotational force of the rotary drive device; a first rotary shaft mechanism supported by the transmission support mechanism and rotatable around an axis in the first direction; a plurality of first rotating rod-shaped members extending radially from the rotation axis of the first rotary shaft mechanism; a second rotary shaft mechanism supported by the transmission support mechanism and rotatable around an axis in the second direction; and a plurality of second rotating rod-shaped members extending radially from the rotation axis of the second rotary shaft mechanism, wherein the second rotating rod-shaped members engage with the first rotating rod-shaped member, and the second rotating rod-shaped member rotates as the first rotating rod-shaped member rotates.

[0021] This ground improvement system comprises a first rotating shaft mechanism that rotates around a first direction as its rotation axis, a second rotating shaft mechanism that rotates in a second direction perpendicular to the first direction, a first rotating rod-shaped member that rotates in response to the rotation of the first rotating shaft mechanism, and a second rotating rod-shaped member that rotates in response to the rotation of the second rotating shaft mechanism, and is capable of performing excavation by rotating around two axes.

[0022] At this time, the second rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, so excavation can be performed efficiently, and the ground improvement device does not require gears because it rotates on two axes. This eliminates gear wear and tear and reduces maintenance frequency. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a ground improvement device that can perform excavation by transmitting rotational force to a rotor of a multi-directional rotation shaft without using gears. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a side view showing a ground improvement system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing the ground improvement device of the ground improvement system shown in FIG. [Figure 3]FIG. 2 is a side view showing the ground improvement device of the ground improvement system shown in FIG. [Figure 4] FIG. 2 is a bottom view showing the ground improvement device of the ground improvement system shown in FIG. [Figure 5] 1 is a front cross-sectional view showing a ground improvement device according to an embodiment of the present invention. [Figure 6] A side view showing a ground improvement system according to a modified embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] A ground improvement device S2 according to an embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the left-right direction in Fig. 2 is referred to as the first direction (X direction), the up-down direction in Fig. 2 is referred to as the second direction (Y direction), and the direction perpendicular to the paper surface in Fig. 2 is referred to as the fifth direction (Z direction). Furthermore, in Fig. 3, the direction tilted at a predetermined angle to the left with respect to the second direction is referred to as the third direction (Y1 direction), and the direction tilted at a predetermined angle to the right with respect to the second direction in Fig. 3 is referred to as the fourth direction (Y2 direction).

[0026] <Configuration of the ground improvement device> As shown in Fig. 1, the ground improvement system S includes a large base machine S1 such as a pile driver and a ground improvement device S2 attached to the tip of the leader of the base machine S1. According to the ground improvement system S of the present invention, the ground improvement device S2 excavates the ground underground to perform ground improvement.

[0027] As shown in Figures 2 to 5, the ground improvement device S2 includes a rotary drive device 6, a transmission support mechanism 7, a first rotating shaft mechanism 1, a second rotating shaft mechanism 2, a third rotating shaft mechanism 3, a fourth rotating shaft mechanism 4, a fifth rotating shaft mechanism 5, a plurality of first rotating rod-shaped members 11, a plurality of second rotating rod-shaped members 21, a plurality of third rotating rod-shaped members 31, a plurality of fourth rotating rod-shaped members 41, and a plurality of rotary excavation members 50.

[0028] The rotation drive device 6 is a motor such as a well-known wheel motor, and is connected to a power source to convert power into rotational force. The rotation drive device 6 is supported on the upper end side of the transmission support mechanism 7, and rotates around an axis in the first direction (X direction).

[0029] The transmission support mechanism 7 transmits the rotational force of the rotary drive device 6 to the first rotation shaft mechanism 1 and the fifth rotation shaft mechanism 5. Specifically, the transmission support mechanism 7 includes a support body 71 that supports the first to fifth rotation shaft mechanisms 1, 2, 3, 4, and 5, and a first transmission gear G and a second transmission gear G2 (described later) that are provided within the support body 71 and rotatably supported by the support body 71.

[0030] In detail, as shown in FIG. 5, the transmission support mechanism 7 includes a pinion gear GP that converts the rotational force of the rotational drive device 6 having an axis in the first direction into a rotational force having an axis in the second direction, a first transmission gear G1 that is interposed between the pinion gear GP and a fifth rotating gear 55 of a fifth rotating shaft mechanism 5 described later and transmits the rotational force of the rotational drive device 6 to the fifth rotating shaft mechanism 5, and a second transmission gear G2 that is interposed between the fifth rotating gear 55 of the fifth rotating shaft mechanism 5 and the first rotating gear 15 of the first rotating shaft mechanism 1 and transmits the rotational force of the rotational drive device 6 to the first rotating shaft mechanism 1 via the fifth rotating shaft mechanism 5.

[0031] The first rotary shaft mechanism 1 includes a first rotary gear 15 that engages with the second transmission gear G2 and receives the rotational force from the rotary drive mechanism, a pair of first rotary members 12 that are provided on the outside of the first rotary gear 15, and a first extension member 13 that is coupled to each first rotary member 12 and extends in a first direction. The first rotary member 12 and the first extension member 13 rotate about an axis in the first direction in response to the rotation of the first rotary gear 15.

[0032] The first rotating gear 15 is rotatably supported by the transmission support mechanism 7, and each of the first rotating members 12 provided on the first rotating gear 15 and each of the first extending members 13 coupled to the first rotating members 12 are rotatably supported by the transmission support mechanism 7. In this way, the first rotating shaft mechanism 1 is supported by the transmission support mechanism 7.

[0033] The multiple first rotating rod members 11 are provided on one of a pair of first rotating members 12 and extend radially in approximately the same plane from the rotation axis of the first rotating member 12. The first rotating rod members 11 extend to a length that allows them to engage with the second rotating rod member 21, third rotating rod member 31, and fourth rotating rod member 41, which will be described later. In this embodiment, as shown in Figure 3, twelve first rotating rod members 11 are provided so as to extend radially at equal angles to one another. Note that in Figure 3, the rotary drilling member 50 provided on the first rotating shaft mechanism 1 is not shown.

[0034] Furthermore, the first rotating shaft mechanism 1 has a plurality of rotary drilling members 50. Specifically, the plurality of rotary drilling members 50 are provided on a first rotating member 12 other than the first rotating member 12 on which the first rotating rod-shaped member 11 is provided, and extend radially from the rotation axis of the first rotating member 12. In this embodiment, the plurality of rotary drilling members are provided so that four rotary drilling members 50 extend radially from the first rotating member 12 at equal angles to each other. Note that the rotary drilling members provided on the first rotating member 12 are adjusted in length so as not to engage with the second rotating rod-shaped member 21, the third rotating rod-shaped member 31, and the fourth rotating rod-shaped member 41.

[0035] Each of the pair of first extension members 13 is provided with rotary drilling members 50 extending radially from the rotation axis of the first extension member 13. In this embodiment, four rotary drilling members 50 are provided on each first extension member 13 at different positions in the extension direction of the first extension member 13. The rotary drilling members 50 provided on the first rotation member 12 and the rotary drilling members 50 provided on the first extension member 13 have different lengths.

[0036] The second rotating shaft mechanism 2 includes a second rotating member 22 that is provided at the tip of the support portion of the transmission support mechanism 7 and that is rotatable about an axis in a second direction that is perpendicular to the first direction. The second rotating member 22 is rotatably attached to the transmission support mechanism 7, and thus the second rotating shaft mechanism 2 is rotationally supported by the transmission support mechanism 7. In addition, a triangular plate-shaped tip member 26 is provided at the tip side of the rotating shaft of the second rotating member 22.

[0037] The second rotating rod members 21 are attached to the second rotating member 22 so as to extend radially in approximately the same plane from the rotation axis of the second rotating member 22. The second rotating rod members 21 have a length that allows them to engage with at least the first rotating rod member 11 and does not interfere with the rotary excavation member 50. In this embodiment, four second rotating rod members 21 are provided so as to extend radially at equal angles from each other from the second rotating member 22. Each second rotating rod member 21 is also provided with a pair of tip claw members 27 extending toward its tip.

[0038] The second rotating shaft mechanism 2 rotates when the second rotating rod-shaped member 21 engages with the rotating first rotating rod-shaped member 11. This causes the second rotating member 22 and the tip member 26 to rotate about an axis in the second direction.

[0039] The third rotating shaft mechanism 3 includes a third rotating member 32 provided at the tip of the support portion of the transmission support mechanism 7 so as to be rotatable about an axis in a third direction that intersects the first direction and the second direction. The third rotating member 32 is rotatably attached to the transmission support mechanism 7, and thus the third rotating shaft mechanism 3 is supported by the transmission support mechanism 7.

[0040] The third rotating rod members 31 are attached to the rotation mechanism so as to extend radially from the third rotating member 32 in approximately the same plane from the rotation axis of the third rotating member 32. In this embodiment, four third rotating rod members 31 are provided so as to extend radially at equal intervals from one another. Each third rotating rod member 31 is provided with a pair of tip claw members 37 extending toward its tip.

[0041] The third rotating shaft mechanism 3 rotates when the third rotating rod-shaped member 31 engages with the rotating first rotating rod-shaped member 11. This causes the third rotating member 32 to rotate about an axis in the third direction.

[0042] The fourth rotating shaft mechanism 4 includes a fourth rotating member 42 provided at the tip of the support portion of the transmission support mechanism 7 so as to be rotatable about an axis in a fourth direction that intersects the first direction and the second direction. The fourth rotating member 42 is rotatably attached to the transmission support mechanism 7, and thus the fourth rotating shaft mechanism 4 is supported by the transmission support mechanism 7.

[0043] The fourth rotating rod members 41 are attached to the rotation mechanism so as to extend radially from the rotation axis of the fourth rotating member 42 in approximately the same plane. In this embodiment, four fourth rotating rod members 41 are provided so as to extend radially at equal intervals from one another. Each fourth rotating rod member 41 is provided with a pair of tip claw members 47 extending toward its tip.

[0044] The fourth rotating shaft mechanism 4 rotates when the fourth rotating rod-shaped member 41 engages with the rotating first rotating rod-shaped member 11. This causes the fourth rotating member 42 to rotate about an axis in the fourth direction.

[0045] The fifth rotating shaft mechanism 5 includes a fifth rotating gear 55 that engages with the first transmission gear G1 and receives the rotational force from the rotation drive mechanism, a pair of fifth rotating members 52 that are provided on the outside of the fifth rotating gear 55, and fifth extension members 53 that are coupled to each fifth rotating member 52 and extend in the first direction.

[0046] The fifth rotating gear 55 is rotatably supported by the transmission support mechanism 7, and each of the fifth rotating members 52 provided on the fifth rotating gear 55 and each of the fifth extending members 53 coupled to the fifth rotating members 52 are rotatably supported by the transmission support mechanism 7. In this way, the fifth rotating shaft mechanism 5 is supported by the transmission support mechanism 7.

[0047] Furthermore, the fifth rotating shaft mechanism 5 has a plurality of rotary drilling members 50. Specifically, each fifth rotating member 52 is provided with at least one rotary drilling member 50 extending radially from the rotation axis of the fifth rotating member 52. In this embodiment, a pair of rotary drilling members 50 extend linearly from the fifth rotating member 52.

[0048] Each fifth rotating member 52 is provided with a plurality of rotary excavation members 50 extending radially from the rotation axis. The plurality of rotary excavation members 50 are provided at different positions in the extension direction of the fifth extension member 53 so as to extend radially at equal angles to each other in a plan view from the first direction. In this embodiment, four rotary excavation members 50 extend radially from each fifth extension member 53 at different positions in the extension direction of the fifth extension member 53.

[0049] <Operation of the ground improvement device> When the operation of the ground improvement device S2 starts, first, the rotary drive device 6 rotates around an axis in the first direction. When the rotary drive device 6 rotates, the first transmission gear G1 rotates via the pinion gear GP, and the fifth rotary gear 55 engaged with the first transmission gear G1 rotates.

[0050] As the fifth rotating gear 55 rotates, a pair of fifth rotating members 52 and a pair of fifth extension members 53 connected to the fifth rotating gear 55 rotate, and the rotary drilling members 50 provided on each fifth rotating member 52 and each fifth extension member 53 rotate.

[0051] Furthermore, as the fifth rotary gear 55 rotates, the second transmission gear G2 engaged with the fifth rotary gear 55 rotates, and the first rotary gear 15 engaged with the second transmission gear G2 rotates.

[0052] As the first rotating gear 15 rotates, a pair of first rotating members 12 and a pair of first extension members 13 connected to the first rotating gear 15 rotate, and the first rotating rod-shaped member 11 provided on one of the first rotating members 12 and the rotary drilling members 50 provided on the other first rotating member 12 and each first extension member 13 rotate.

[0053] As the first rotating rod member 11 rotates, the second rotating rod member 21, the third rotating rod member 31, and the fourth rotating rod member 41 that are engaged with the first rotating rod member 11 also rotate.

[0054] The ground improvement device S2 excavates the ground to a predetermined depth by rotating the first to fifth rotating rod-shaped members and the multiple rotary excavation members 50. In particular, since the second rotating rod-shaped member 21, the third rotating rod-shaped member 31, and the fourth rotating rod-shaped member 41 rotate around axes in different directions, the efficiency of the excavation work of the ground improvement device S2 is significantly improved.

[0055] <Modification> In this embodiment, the soil improvement device S2 is described as being attached to a large base machine S1 such as a pile driver. However, the soil improvement device S2 may also be attached to a small base machine S5 such as a backhoe as shown in Fig. 6, and the base machine to which the soil improvement device S2 is attached is selected depending on the excavation depth and the excavation environment.

[0056] In this embodiment, the ground improvement device S2 has been described as having a first rotating shaft mechanism 1, a second rotating shaft mechanism 2, a third rotating shaft mechanism 3, a fourth rotating shaft mechanism 4, and a fifth rotating shaft mechanism 5. However, it is sufficient that the ground improvement device S2 has at least the first rotating shaft mechanism 1 and the second rotating shaft mechanism 2. Note that by providing a plurality of rotating shaft mechanisms, such as the third rotating shaft mechanism 3, the fourth rotating shaft mechanism 4, and the fifth rotating shaft mechanism 5, it is possible to improve excavation efficiency.

[0057] In the present embodiment, the transmission support mechanism 7 has been described as transmitting the rotational force of the first rotating shaft mechanism 1 by a transmission gear provided inside the support body 71. However, the transmission support mechanism 7 may also transmit the rotational force by a configuration such as a sprocket and a transmission chain, as long as it transmits the rotational force of the first rotating shaft mechanism 1.

[0058] The above describes the ground improvement system according to the embodiment of the present invention. However, the ground improvement system is not limited to the above embodiment and may have other configurations as long as the object of the invention is achieved. [Industrial Applicability]

[0059] The present invention can be used in civil engineering works such as ground improvement works. [Explanation of symbols]

[0060] S: Ground improvement system S1: Base machine S2: Ground improvement equipment S5: Base machine G1: First transmission gear G2: Second transmission gear GP: Pinion gear 1: First rotation axis mechanism 2: Second rotation axis mechanism 3: Third rotation axis mechanism 4: Fourth rotation axis mechanism 5: Fifth rotation axis mechanism 6: Rotation drive device 7: Transmission support mechanism 11: First rotating rod member 12: First rotating member 13: First extending member 15: First rotating gear 21: Second rotating rod member 22: Second rotating member 26: Tip member 27: Tip claw member 31: Third rotating rod-shaped member 32: Third rotating member 37: Tip claw member 41: Fourth rotating rod-shaped member 42: Fourth rotating member 47: Tip claw member 50: Rotary drilling element 52: Fifth rotating member 53: Fifth extending member 55: Fifth rotating gear 71 :Support

Claims

1. a rotary drive device that rotates about an axis in a first direction; a transmission support mechanism that extends in a second direction perpendicular to the first direction and transmits a rotational force of the rotation drive device; a first rotation shaft mechanism supported by the transmission support mechanism and rotatable about an axis in the first direction; a plurality of first rotating rod members extending radially from a rotation axis of the first rotating shaft mechanism; a second rotation shaft mechanism supported by the transmission support mechanism and rotatable about an axis in the second direction; a plurality of second rotating rod members extending radially from the rotation axis of the second rotating shaft mechanism; the second rotating rod member engages with the first rotating rod member; A ground improvement device characterized in that a second rotating rod member is rotated by the rotation of a first rotating rod member.

2. a third rotation axis mechanism extending in a third direction intersecting the second direction and rotatable about an axis in the third direction; a plurality of third rotating rod members extending radially from the rotation axis of the third rotating shaft mechanism; the third rotating rod member engages with the first rotating rod member; 2. The soil improvement device according to claim 1, wherein the third rotating rod member is rotated by the rotation of the first rotating rod member.

3. a fourth rotation axis mechanism that extends in a fourth direction different from the third direction and intersecting the second direction, and that is rotatable about an axis in the fourth direction; a plurality of fourth rotating rod members extending radially from the rotation axis of the fourth rotating shaft mechanism; the fourth rotating rod member engages with the first rotating rod member; 3. The soil improvement device according to claim 2, wherein the fourth rotating rod member is rotated by the rotation of the first rotating rod member.

4. a fifth rotation shaft mechanism supported by the transmission support mechanism on a side opposite to the second rotation shaft mechanism with the first rotation shaft mechanism interposed therebetween in the second direction, and rotatable about an axis in the first direction; a plurality of rotary excavation members extending radially from the rotation axis of the fifth rotation axis mechanism; The soil improvement device according to claim 1 , wherein the fifth rotation shaft mechanism is rotated by a rotational force of the rotation drive device.

5. The ground improvement device according to claim 1 , wherein the first rotary shaft mechanism further comprises a plurality of rotary excavation members extending radially from a rotation axis of the first rotary shaft mechanism.

6. a base machine; and a rotary drive device attached to the base machine and configured to rotate about an axis in a first direction; a transmission support mechanism that extends in a second direction perpendicular to the first direction and transmits a rotational force of the rotation drive device; a first rotation shaft mechanism supported by the transmission support mechanism and rotatable about an axis in the first direction; a plurality of first rotating rod members extending radially from a rotation axis of the first rotating shaft mechanism; a second rotation shaft mechanism supported by the transmission support mechanism and rotatable about an axis in the second direction; a plurality of second rotating rod members extending radially from the rotation axis of the second rotating shaft mechanism; the second rotating rod member engages with the first rotating rod member; A ground improvement system characterized in that a second rotating rod-shaped member rotates as a result of a first rotating rod-shaped member rotating.

Images