JP7588919B1 - Ground Improvement Equipment - Google Patents

Abstract

According to the present invention, there is provided a ground improvement device capable of excavating by transmitting rotational force to a rotor of a multi-directional rotating shaft without using gears.
[Solution] The ground improvement device comprises 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 supported by the transmission support mechanism and rotatable around an axis in the first direction, a plurality of first rotating rod members extending radially from the rotation axis of the first rotating shaft mechanism, a second rotating shaft mechanism supported by the transmission support mechanism and rotatable around an axis in the second direction, and a plurality of second rotating rod members extending radially from the rotation axis of the second rotating shaft mechanism, wherein the second rotating rod members are engaged with the first rotating rod member, and the second rotating rod member rotates as the first rotating rod member rotates.
[Selected figure] Figure 2

Description

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 multiple rotating shaft mechanisms.

Conventionally, ground improvement devices have been widely used to excavate and improve the ground by rotating the ground. Most of these devices usually use a single rotating shaft to rotate an excavation member (rotor) or the like to perform excavation.

However, this method had the problem that excavation efficiency was low and it was difficult to improve the ground uniformly. In particular, when the soil was highly viscous, the excavated soil rotated with the rotation of the excavation blade, which could result in the formation of an inhomogeneous improvement column due to insufficient mixing, or a decrease in the efficiency of improvement.

To prevent these problems, a ground improvement device equipped with anti-rotation wings has been proposed. For example, Patent Document 1 discloses a device equipped with an excavation wing installed symmetrically with respect to a central axis, at least one lateral rotor arranged above the excavation wing, and an anti-rotation wing arranged symmetrically between the excavation wing and the lateral rotor and extending radially outward beyond the excavation wing and the lateral rotor.

The anti-rotation blades are longer than the drilling blades and are attached to the drilling rod so that they can rotate freely, so they come to a standstill when they encounter resistance from the ground around the borehole, improving the efficiency of soil excavation and allowing the solidification material slurry to be mixed well.

JP 2024-11444 A

In the ground improvement device described in Patent Document 1, the rotational driving force is transmitted by gears, and the excavation blade and the horizontal rotor are rotated together to prevent the soil from rotating together, and the excavated soil mass is sheared and mixed. However, because these devices use gears to transmit the rotational driving force, high precision is required in the manufacture and assembly of the gears, resulting in high manufacturing costs.

In addition, wear and tear on various parts during use makes it difficult to maintain high precision over long periods of time. Furthermore, gears are prone to wear and tear, which increases the frequency of maintenance.

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 the rotors of a multi-directional rotating shaft without using gears.

(1) The 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 supported by the transmission support mechanism and rotatable around an axis in the first direction, a plurality of first rotating rod members that extend radially from the rotation axis of the first rotating shaft mechanism, a second rotating shaft mechanism supported by the transmission support mechanism and rotatable around an axis in the second direction, and a plurality of second rotating rod members that extend radially from the rotation axis of the second rotating shaft mechanism, and the second rotating rod members are engaged with the first rotating rod members, and the second rotating rod members rotate as the first rotating rod members rotate.

This ground improvement device is equipped with a first rotating shaft mechanism that rotates around a first direction as the 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 can perform excavation by rotating around two axes.

At this time, the second rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, so even though excavation can be performed efficiently, the ground improvement device does not require gears to rotate on two axes. This prevents wear and tear on the gears and reduces the frequency of maintenance.

(2) The ground improvement device further includes a third rotating shaft mechanism that extends in a third direction intersecting the second direction and is rotatable about an axis in the third direction, and a plurality of third rotating rod members that extend radially from the rotation axis of the third rotating shaft mechanism, and the third rotating rod members engage with the first rotating rod members, and the third rotating rod members rotate as the first rotating rod members rotate.

This ground improvement device further includes a third rotating shaft mechanism that rotates around a third direction as a rotation axis, and a third rotating rod-shaped member that rotates in response to the rotation of the third rotating shaft mechanism, and excavation can be performed by rotating around three axes. At this time, the third rotating rod-shaped member rotates by engaging with the first rod-shaped rotating member, so that the ground improvement device does not require gears to rotate around three axes, even though excavation can be performed efficiently. This prevents wear and tear on the gears and reduces the frequency of maintenance.

(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 is rotatable about an axis in the fourth direction, and a plurality of fourth rotating rod members that extend radially from the rotation axis of the fourth rotating shaft mechanism, the fourth rotating rod members engaging with the first rotating rod members, and the rotation of the first rotating rod members causes the fourth rotating rod members to rotate.

This ground improvement device further includes a fourth rotating shaft mechanism that rotates around the fourth direction as the rotation axis, and a fourth rotating rod-shaped member that rotates in response to the rotation of the fourth rotating shaft mechanism, and excavation can be performed by rotating around four axes. At this time, since the fourth rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, the ground improvement device does not require gears to rotate around four axes, despite being able to excavate efficiently. This prevents wear and tear on the gears and reduces the frequency of maintenance.

(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 from the rotation axis of the fifth rotating shaft mechanism, and the fifth rotating shaft mechanism rotates due to the rotational force of the rotary drive device.

This ground improvement device further includes a fifth rotating shaft mechanism above the first rotating shaft mechanism, and can perform excavation in two stages using a rotary excavation member provided on the fifth rotating shaft mechanism. This allows soil excavated by the second rotating shaft mechanism, third rotating shaft mechanism, and fourth rotating shaft mechanism at the tip side to be further excavated in two stages by the first rotating shaft mechanism and the fifth rotating shaft mechanism, making it possible to handle deep soil.

(5) The ground improvement device described above is provided with 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 providing the first rotary shaft mechanism with rotary excavation members in addition to the first rotating rod-shaped member.

(6) A base machine, 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 rotary shaft 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 rotary shaft of the second rotary shaft mechanism, wherein the second rotating rod-shaped members engage with the first rotating rod-shaped members, and the second rotating rod-shaped members rotate as the first rotating rod-shaped members rotate.

This ground improvement system includes a first rotating shaft mechanism that rotates around a first direction as the axis of rotation, 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 can perform excavation by rotating around two axes.

At this time, the second rotating rod-shaped member rotates by engaging with the first rotating rod-shaped member, so even though excavation can be performed efficiently, the ground improvement device does not require gears to rotate on two axes. This prevents wear and tear on the gears and reduces the frequency of maintenance.

The present invention provides a ground improvement device that can perform excavation by transmitting rotational force from a multi-directional rotating shaft without using gears.

FIG. 2 is a side view showing a ground improvement system according to an embodiment of the present invention. FIG. 2 is a front view showing the ground improvement device of the ground improvement system shown in FIG. 1 . FIG. 2 is a side view showing a ground improvement device of the ground improvement system shown in FIG. 1 . FIG. 2 is a bottom view showing the ground improvement device of the ground improvement system shown in FIG. 1 . 1 is a front cross-sectional view showing a ground improvement device according to an embodiment of the present invention. A side view showing a ground improvement system relating to a modified embodiment of the present invention.

The 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, the direction tilted a certain angle to the left from the second direction in FIG. 3 is referred to as the third direction (Y1 direction), and the direction tilted a certain angle to the right from the second direction in FIG. 3 is referred to as the fourth direction (Y2 direction).

<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 toward the underground, thereby performing ground improvement.

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.

The rotary drive device 6 is a motor such as a wheel motor that is well known in the art, and is connected to a power source to convert the power into a rotational force. The rotary 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).

The transmission support mechanism 7 transmits the rotational force of the rotary drive device 6 to the first rotary shaft mechanism 1 and the fifth rotary shaft mechanism 5. Specifically, the transmission support mechanism 7 includes a support 71 that supports the first to fifth rotary 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 71 and rotatably supported by the support 71.

In detail, as shown in FIG. 5, the transmission support mechanism 7 includes a pinion gear GP that converts the rotational force of the rotation drive device 6 about its axis in the first direction into a rotational force about its 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 below and transmits the rotational force of the rotation 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 rotation drive device 6 to the first rotating shaft mechanism 1 via the fifth rotating shaft mechanism 5.

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

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 the first extension members 13 connected to each of the first rotating members 12 are rotatably supported by the transmission support mechanism 7. As a result, the first rotating shaft mechanism 1 is supported by the transmission support mechanism 7.

The multiple first rotating rod-shaped members 11 are provided on one of the pair of first rotating members 12 and extend radially from the rotation axis of the first rotating member 12 in approximately the same plane. The first rotating rod-shaped members 11 extend to a length that allows them 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 described below. In this embodiment, as shown in FIG. 3, twelve first rotating rod-shaped members 11 are provided so as to extend radially at equal angles to each other. Note that in FIG. 3, the rotary drilling member 50 provided on the first rotating shaft mechanism 1 is omitted.

Furthermore, the first rotating shaft mechanism 1 has a plurality of rotating drilling members 50. Specifically, the plurality of rotating drilling members 50 are provided on the other first rotating member 12 different from 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 rotating drilling members are provided so that four rotating drilling members 50 extend radially from the first rotating member 12 at equal angles to each other. Note that the rotating drilling members provided on the first rotating member 12 are adjusted to a length that does not engage with the second rotating rod-shaped member 21, the third rotating rod-shaped member 31, and the fourth rotating rod-shaped member 41.

In addition, each of the pair of first extension members 13 is provided with a rotary drilling member 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.

The second rotating shaft mechanism 2 includes a second rotating member 22 provided at a tip of a support 71 of the transmission support mechanism 7 to be rotatable about an axis in a second direction perpendicular to the first direction. The second rotating member 22 is rotatably attached to the support 71 of the transmission support mechanism 7, so that the second rotating shaft mechanism 2 can rotate relative to 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.

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

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 around an axis in the second direction.

The third rotating shaft mechanism 3 includes a third rotating member 32 that is provided at the tip of the support part of the transmission support mechanism 7 and is 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.

The third rotating rod-shaped members 31 are attached to the rotating 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-shaped members 31 are provided so as to extend radially at equal intervals from each other. In addition, each third rotating rod-shaped member 31 is provided with a pair of tip claw members 37 extending toward the tip.

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 around an axis in the third direction.

The fourth rotating shaft mechanism 4 includes a fourth rotating member 42 that is provided at the tip of the support part of the transmission support mechanism 7 and is 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.

The fourth rotating rod-shaped members 41 are attached to the rotating mechanism so as to extend radially from the fourth rotating member 42 in approximately the same plane from the rotation axis of the fourth rotating member 42. In this embodiment, four fourth rotating rod-shaped members 41 are provided so as to extend radially at equal intervals from each other. In addition, each fourth rotating rod-shaped member 41 is provided with a pair of tip claw members 47 extending toward the tip.

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 around an axis in the fourth direction.

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 a fifth extending member 53 that is coupled to each of the fifth rotating members 52 and extends in the first direction.

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 the fifth extension members 53 connected to each of the fifth rotating members 52 are rotatably supported by the transmission support mechanism 7. As a result, the fifth rotating shaft mechanism 5 is supported by the transmission support mechanism 7.

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

Each fifth rotating member 52 is provided with multiple rotary drilling members 50 extending radially from the rotation axis. The multiple rotary drilling 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 drilling members 50 extend radially from each fifth extension member 53 at different positions in the extension direction of the fifth extension member 53.

<Operation of the ground improvement device>
When the operation of the ground improvement device S2 is started, first, the rotary drive device 6 rotates about 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.

When the fifth rotating gear 55 rotates, a pair of fifth rotating members 52 and a pair of fifth extending members 53 connected to the fifth rotating gear 55 rotate, and the rotating drilling members 50 provided on each of the fifth rotating members 52 and each of the fifth extending members 53 rotate.

In addition, as the fifth rotating gear 55 rotates, the second transmission gear G2 engaged with the fifth rotating gear 55 rotates, and the first rotating gear 15 engaged with the second transmission gear G2 rotates.

When the first rotating gear 15 rotates, the pair of first rotating members 12 and the pair of first extending 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 rotating drilling members 50 provided on the other first rotating member 12 and each first extending member 13 rotate.

By rotating the first rotating rod member 11, the second rotating rod member 21, the third rotating rod member 31, and the fourth rotating rod member 41, which are engaged with the first rotating rod member 11, rotate.

By rotating the first to fifth rotating rod members and the multiple rotating excavation members 50, the ground improvement device S2 excavates the ground to a specified depth. In particular, since the second rotating rod member 21, the third rotating rod member 31, and the fourth rotating rod member 41 rotate around axes in different directions, the efficiency of the excavation work of the ground improvement device S2 is significantly improved.

<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 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 according to the excavation depth and excavation environment.

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 for the ground improvement device S2 to have at least the first rotating shaft mechanism 1 and the second rotating shaft mechanism 2. Note that by providing multiple 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.

In this embodiment, the transmission support mechanism 7 is described as transmitting the rotational force of the first rotating shaft mechanism 1 by a transmission gear provided in the support 71. However, the transmission support mechanism 7 may also transmit the rotational force by a configuration such as a sprocket and a transmission chain, so long as it transmits the rotational force of the first rotating shaft mechanism 1.

The above describes the ground improvement system according to an embodiment of the present invention. However, the ground improvement system is not limited to the above embodiment, and can have other configurations as long as the object of the invention is achieved.

This invention can be used in civil engineering works such as ground improvement work.

S: Ground improvement system S1: Base machine S2: Ground improvement device S5: Base machine G1: First transmission gear G2: Second transmission gear GP: Pinion gear 1: First rotating shaft mechanism 2: Second rotating shaft mechanism 3: Third rotating shaft mechanism 4: Fourth rotating shaft mechanism 5: Fifth rotating shaft mechanism 6: Rotation drive device 7: Transmission support mechanism 11: First rotating rod-shaped member 12: First rotating member 13: First extension member 15: First rotating gear 21: Second rotating rod-shaped 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 member 52 : Fifth rotating member 53 : Fifth extending member 55 : Fifth rotating gear 71 : Support

Claims (6)

a rotary drive device that rotates about an axis in a first direction;
a transmission support mechanism extending in a second direction perpendicular to the first direction and configured to transmit a rotational force of the rotation drive device;
a first rotation shaft mechanism supported by the transmission support mechanism and configured to rotate about an axis in the first direction by receiving a rotational force of the rotation drive device ;
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 a support body of the transmission support mechanism and rotatable about an axis in the second direction;
a plurality of second rotating rod members extending radially from a rotation axis of the second rotating shaft mechanism;
the second rotating rod member engages the first rotating rod member;
A ground improvement device characterized in that a first rotating rod member rotates, thereby rotating a second rotating rod member, and excavation is performed by the first rotating rod member and the second rotating rod member .
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 a rotation axis of the third rotating shaft mechanism;
the third rotating rod member engages 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.
a fourth rotation axis mechanism that extends in a fourth direction different from the third direction and intersects with the second direction and is rotatable about an axis in the fourth direction;
a plurality of fourth rotating rod members extending radially from a rotation axis of the fourth rotating shaft mechanism;
the fourth rotating rod member engages 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.
a fifth rotation shaft mechanism supported by the transmission support mechanism on a side opposite to the second rotation shaft mechanism with respect to the first rotation shaft mechanism in the second direction and rotatable about an axis in the first direction;
a plurality of rotary excavation members extending radially from a rotation axis of the fifth rotary shaft mechanism;
The ground improvement device according to claim 1 , wherein the fifth rotating shaft mechanism is rotated by a rotational force of the rotary drive device.
The ground improvement device according to claim 1 , further comprising a plurality of rotary excavation members extending radially from a rotation axis of the first rotating shaft mechanism.
A base machine; a rotary drive device attached to the base machine and configured to rotate about an axis in a first direction;
a transmission support mechanism extending in a second direction perpendicular to the first direction and configured to transmit a rotational force of the rotation drive device;
a first rotation shaft mechanism supported by the transmission support mechanism and configured to rotate about an axis in the first direction by receiving a rotational force of the rotation drive device ;
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 a support body of the transmission support mechanism and rotatable about an axis in the second direction;
a plurality of second rotating rod members extending radially from a rotation axis of the second rotating shaft mechanism;
the second rotating rod member engages the first rotating rod member;
A ground improvement system in which a first rotating rod member rotates, causing a second rotating rod member to rotate, and excavation is performed by the first rotating rod member and the second rotating rod member .

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