Rod connection structure in ground improvement device

Abstract

To provide a rod connection structure that can connect rods of a ground improvement device with each other using connecting pins, and also connect angle measurement cables inside rods to allow ground improvement to be performed while properly maintaining a tilt angle of a hydraulic auger.SOLUTION: Rods 1 are connected in such a way that a connection end of one rod 1 is a male rod end 10 with a pin hole and a connection end of the other rod is a female rod end 11 with a pin hole, and the opposing male rod end 10 and female rod end 11 are connected and fixed by a connecting pin P inserted into matching pin holes 80, 90. An angle measuring cable C inserted through a cable hole in the rod 1 is connected to an inclination angle measuring device T on the ground, so that an inclination angle of a hydraulic auger 6 can be measured freely. The hydraulic auger 6 is tilted in a desired direction in a vertical plane within a rotation range of up to 180 degrees by a vertical rotor 3 connected to a lower end of the rod 1, and ground improvement piles of a desired shape are created within a desired range.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention belongs to the technical field of connecting structures such as rods in ground improvement equipment that performs ground improvement within a desired range of the original ground using a mechanical mixing and deep mixing treatment method in which cement-based stabilizers and in-situ soil are stirred and mixed using a treatment machine to create ground improvement piles or ground improvement bodies, and then the soft original ground is solidified and improved. [Background technology]

[0002] The present applicant has obtained a patent for a ground improvement device suitable for a ground improvement method using a mechanical stirring deep mixing treatment method, as shown in Figures 7 and 8 and described in Patent Document 1 below. Patent Document 1 discloses a ground improvement device used in a mechanical stirring and deep mixing treatment method in which a soft ground 2 is penetrated while being excavated, a stabilizing material is discharged by penetration discharge or pull-up discharge, and the stabilizing material is stirred and mixed with the in-situ soil to create a ground improvement pile or a ground improvement body. The ground improvement device comprises a rotating device 5 and a hydraulic auger 6, and the rotating device 5 is a vertical rotating body 3 having a horizontal shaft portion 30 and left and right vertical portions 31 connected to both ends of the horizontal shaft portion 30 and rotatable on a vertical plane, and the left and right vertical portions 31 are rotatable on a vertical plane by 90 degrees to the left and right. The document describes a ground improvement device characterized by a configuration in which the device rotates within a range of up to 180 degrees, the hydraulic auger 6 is connected to the left and right vertical portions 31 of the vertical rotor 3, the upper end of the vertical rotor 3 can be freely attached to the lower end of a rod 1 or an arm 70 of a backhoe 7, the left and right vertical portions 31 of the vertical rotor 3 tilt the hydraulic auger 6 in a desired direction S on a vertical plane within the range of rotation of up to 180 degrees, and ground improvement piles or ground improvement bodies of a desired shape are constructed within a desired range (see claim 4 in the same document 1).

[0003] On the other hand, various means for connecting the rods of the soil improvement device are known. For example, Patent Document 2 listed below describes a construction machinery rod comprising a female rod having a female side tubular portion and a male rod having a male side shaft portion, the male side shaft portion being inserted into the female side tubular portion so as to connect the female side rod and the male side rod in a manner allowing torque to be transmitted, a substantially U-shaped female side groove extending in a direction perpendicular to the rod axial direction being formed on the inner wall surface of the female side tubular portion, a substantially U-shaped male side groove extending in a direction perpendicular to the rod axial direction being formed on the circumferential surface of the male side shaft portion, a connecting pin being inserted into the female side groove and the male side groove so as to restrict relative movement between the female side rod and the male side rod in the rod axial direction, and the male side groove being formed in an arc shape that increases in distance from the connecting pin from the center to both ends when viewed in a cross section perpendicular to the rod axial direction at the height of the axial center of the connecting pin (see claim 1 in Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6397147 [Patent Document 2] Patent No. 6302306 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the ground improvement equipment used in the ground improvement method using the mechanical stirring deep mixing treatment method described above can tilt and rotate the hydraulic auger in the desired direction using a rotating device, and can efficiently construct ground improvement piles (ground improvement bodies) with any cross-sectional shape.However, there is no technology to connect the rods of the ground improvement equipment used in this way to each other, or to connect the rods to the rotating device using connecting pins. Therefore, the object of the present invention is to provide a rod connection structure in a ground improvement device that can be used to connect rods of a ground improvement device used in a ground improvement method using a mechanical stirring deep mixing treatment method, or to connect the rods to a rotating device using a connecting pin, and that can also connect an angle measurement cable inside the rod when connected, allowing ground improvement to be performed while properly maintaining the inclination angle of the hydraulic auger. [Means for solving the problem]

[0006] As a means for solving the above problems, the invention described in claim 1 is a ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is inserted into the soft ground while excavating the soft ground, and a stabilizer is discharged by penetration discharge or pull-up discharge, and the stabilizer is mixed and stirred with the in-situ soil to create a ground improvement pile or a ground improvement body. (a) The ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, the rotating device being a vertical rotating body having a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions being configured to rotate 90 degrees left and right on a vertical plane, with a maximum rotation range of 180 degrees, the hydraulic auger being connected to the left and right vertical portions of the vertical rotating body, and the upper end of the vertical rotating body being attachable to the lower end of the rod, (b) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole; (c) an angle measurement cable is inserted into a cable hole provided inside the rod, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device; (d) The left and right vertical portions of the vertical rotor connected to the lower end of the rod tilt the hydraulic auger in the desired direction of the vertical plane within the range of the maximum rotation of 180 degrees, so that a ground improvement pile or ground improvement body of the desired shape is constructed within the desired range. This is a rod connection structure in a ground improvement device, characterized by the above.

[0007] The invention described in claim 2 is a ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is inserted into the soft ground while excavating the soft ground, and a stabilizer is discharged by penetration discharge or lift discharge, and the stabilizer is mixed and mixed with the in-situ soil to create a ground improvement pile or a ground improvement body. (a) The ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, the rotating device being a vertical rotating body having a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions being configured to rotate 90 degrees left and right on a vertical plane, with a maximum rotation range of 180 degrees, the hydraulic auger being connected to the left and right vertical portions of the vertical rotating body, and the upper end of the vertical rotating body being attachable to the lower end of the rod, (b) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole, and the connection of the rod at the lowest end to the rotating device is such that the protrusion with a pin hole on the top of the vertical rotating body that constitutes the rotating device and the opposing female rod end at the lowest end are connected and fixed by a connecting pin inserted into the matching pin hole, (c) An angle measurement cable is inserted through the cable holes provided in the rod and the vertical rotor, respectively, via the protrusion, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device. (d) The left and right vertical portions of the vertical rotor connected to the lower end of the rod tilt the hydraulic auger in the desired direction of the vertical plane within the range of the maximum rotation of 180 degrees, so that a ground improvement pile or ground improvement body of the desired shape is constructed within the desired range. This is a rod connection structure in a ground improvement device, characterized by the above.

[0008] The invention described in claim 3 is a ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is used to penetrate into the soft ground while excavating the soft ground, and a stabilizer is discharged by penetration discharge or pull-up discharge, and the stabilizer is mixed and stirred with the in-situ soil to create a ground improvement pile or a ground improvement body, (a) the ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, and the rotating device comprises a combination of a vertical rotating body and a horizontal rotating body; (b) the vertical rotor comprises a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions rotate by 90 degrees left and right on the vertical plane, within a maximum rotation range of 180 degrees, the upper end of the vertical rotor is connected to the horizontal rotor, the hydraulic auger is connected to the left and right vertical portions of the vertical rotor, and the horizontal rotor comprises a vertical shaft portion and a horizontal portion journaled on the vertical shaft portion and rotatable within a range of 360 degrees on a horizontal plane, the horizontal portion of the horizontal rotor is connected to the vertical rotor, and the vertical shaft portion of the horizontal rotor is attachable to the lower end of the rod; (c) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole; (d) an angle measurement cable is inserted into a cable hole provided inside the rod, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device; (e) The left and right vertical parts of the vertical rotating body of the rotating device connected to the lower end of the rod tilt the hydraulic auger in the desired direction on the vertical plane within the range of rotation of up to 180 degrees, and the horizontal part of the horizontal rotating body of the rotating device rotates the hydraulic auger in the desired direction on the horizontal plane, so that a ground improvement pile or ground improvement body of the desired shape is constructed in the desired range. This is a rod connection structure in a ground improvement device, characterized by the above.

[0009] The invention described in claim 4 is a ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is used to penetrate into the soft ground while excavating the soft ground, and a stabilizer is discharged by penetration discharge or pull-up discharge, and the stabilizer is mixed and stirred with the in-situ soil to create a ground improvement pile or a ground improvement body, (a) the ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, and the rotating device comprises a combination of a vertical rotating body and a horizontal rotating body; (b) the vertical rotor comprises a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions rotate by 90 degrees left and right on the vertical plane, within a maximum rotation range of 180 degrees, the upper end of the vertical rotor is connected to the horizontal rotor, the hydraulic auger is connected to the left and right vertical portions of the vertical rotor, and the horizontal rotor comprises a vertical shaft portion and a horizontal portion journaled on the vertical shaft portion and rotatable within a range of 360 degrees on a horizontal plane, the horizontal portion of the horizontal rotor is connected to the vertical rotor, and the vertical shaft portion of the horizontal rotor is attachable to the lower end of the rod; (c) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole, and the connection of the rod at the lowest end to the rotating device is such that the protrusion with a pin hole on the top of the horizontal rotating body that constitutes the rotating device and the opposing female rod end at the lowest end are connected and fixed by a connecting pin inserted into the matching pin hole, (d) An angle measurement cable is inserted through the cable holes provided in the rod, the vertical rotor, and the horizontal rotor via the protrusion, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device. (e) The left and right vertical parts of the vertical rotating body of the rotating device connected to the lower end of the rod tilt the hydraulic auger in the desired direction on the vertical plane within the range of rotation of up to 180 degrees, and the horizontal part of the horizontal rotating body of the rotating device rotates the hydraulic auger in the desired direction on the horizontal plane, so that a ground improvement pile or ground improvement body of the desired shape is constructed in the desired range. This is a rod connection structure in a ground improvement device, characterized by the above.

[0010] The invention described in claim 5 is characterized in that a hydraulic hose and a slurry hose are respectively built inside the rod, and the opposing hydraulic hoses and the opposing slurry hoses are connected at a connecting portion between the male rod end and the female rod end, The rod connection structure in the ground improvement device according to claim 1, 2, 3 or 4 is characterized by the above.

[0011] The invention described in claim 6 is a rod connection structure in a ground improvement device described in claim 2 or 4, characterized in that hydraulic hoses and slurry hoses are built into the rod and the vertical or horizontal rotor, respectively, and opposing hydraulic hoses and opposing slurry hoses are connected by connecting portions between the protrusions and the female rod ends.

[0012] The invention described in claim 7 is characterized in that a vertical position holding member that is long in the horizontal direction is provided on the upper surface of the rotation device or on the rod to hold the rod in a vertical position; The rod connection structure in the ground improvement device according to claim 1, 2, 3 or 4 is characterized by the above. The invention described in claim 8 is characterized in that the vertical attitude maintaining member is detachably provided on the upper surface of the rotation device or on the rod. The rod connection structure in the ground improvement device according to claim 7 is characterized in that:

[0013] The invention described in claim 9 is characterized in that the vertical posture maintaining member comprises two parallel rod-shaped members that are long in the horizontal direction, and two connecting plate members that are long in the vertical direction and that connect both ends of the two parallel rod-shaped members to each other and integrate them into a frame shape, and the two parallel rod-shaped members are arranged so as to sandwich the rod when viewed from a planar direction, The rod connection structure in the ground improvement device according to claim 7 is characterized in that: The invention described in claim 10 is characterized in that the rod-shaped member is an H-shaped steel with its web oriented vertically. The rod connection structure in the ground improvement device according to claim 9 is characterized in that:

[0014] The invention described in claim 11 is characterized in that the vertical attitude maintaining member is composed of a pair of left and right vertical attitude maintaining member pieces each having a semi-cylindrical flanged joint portion that connects to the rod so as to surround it, and a main body portion, the main body portion being composed of a plurality of parallel plate-like members that are long in the horizontal direction, and a closing member that connects one end of the plate-like members, and the other end of the plate-like members is connected to the joint portion, The rod connection structure in the ground improvement device according to claim 7 is characterized in that: The invention described in claim 12 is such that, instead of the plurality of parallel plate-like members that are long in the horizontal direction, a member unit consisting of a plurality of parallel plate-like members that are long in the horizontal direction and a connecting plate that connects both ends of the plate-like members can be added as needed between the joint portion and the blocking member to make the horizontal length adjustable, The rod connection structure in the ground improvement device according to claim 11 is characterized in that: [Effects of the Invention]

[0015] According to the rod connection structure of the ground improvement device of the present invention, when connecting rods of the ground improvement device to each other or to the rotation device, they can be connected smoothly using connecting pins, and when connecting, an angle measurement cable inside the rod is also connected, so that the tilt angle of the hydraulic auger can be properly maintained, and the hydraulic auger can be tilted and rotated in the desired direction using the rotation device, allowing for accurate and efficient construction of ground improvement body piles (ground improvement bodies) with any cross-sectional shape. Furthermore, according to the ground improvement device equipped with the vertical attitude maintaining member (15, 25, and 35) described in claim 7, etc., in addition to the above-mentioned effects, even when the vertical rotor rotates in the vertical direction, it is possible to prevent (suppress) misalignment of the rod and maintain the vertical attitude of the rod. Therefore, it is possible to control the hydraulic auger in a stable state and perform good ground improvement work, and ultimately to realize improved ground of excellent quality. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a front view showing the rod connection structure in the ground improvement device according to the present invention, showing the state just before the rods are connected to each other. FIG. [Figure 2] 2 is a front view of a connecting portion showing how rods are connected to each other in the situation of FIG. 1. FIG. [Figure 3] (A) is a top view (top), a front view (middle), and a cross-sectional view (bottom) of the front view showing the male hexagonal protrusion at the upper connecting end of the rod, and (B) is a front view (top) and a bottom view (bottom) showing the female hexagonal recess at the lower connecting end of the rod. [Figure 4] FIG. 10 is a perspective view showing a state immediately before connection between the rod and the rotating device at the connection portion. [Figure 5] FIG. 2 is an enlarged front view showing the structure of a connecting portion of the rotating device. [Figure 6] 1 is an explanatory diagram showing a ground improvement device according to the present invention. [Figure 7] FIG. 10 is an explanatory diagram showing a conventional example. [Figure 8]FIG. 1A is a front view showing a conventional example of a method for connecting a rod and a rotation device, and FIG. 1B is a perspective view showing a different configuration of the rotation device of FIG. 1A, which is equipped with a horizontal rotor. [Figure 9] 1 is an elevation view showing the main part of an embodiment in which a vertical position maintaining member for maintaining the vertical position of a rod is provided in a ground improvement device according to the present invention. [Figure 10] 1A is a front view showing the vertical attitude maintaining member, and FIG. 1B is a plan view of the same. [Figure 11] FIG. 10 is a construction drawing for confirming the effect of the ground improvement device equipped with the vertical attitude maintaining member according to FIG. 9. [Figure 12] FIG. 10 is a construction drawing for confirming the effect of the ground improvement device equipped with the vertical attitude maintaining member according to FIG. 9. [Figure 13] 11 is an elevation view showing a ground improvement device equipped with a vertical attitude maintaining member different from the vertical attitude maintaining member shown in FIG. 10. FIG. [Figure 14] FIG. 14 is a plan view of the soil improvement device according to FIG. 13. [Figure 15] FIG. 14 is a side view of the soil improvement device according to FIG. 13. [Figure 16] FIG. 14 is an elevation view showing a ground improvement device equipped with a vertical attitude maintaining member different from the vertical attitude maintaining member shown in FIGS. 10 and 13. [Figure 17] FIG. 17 is a plan view of FIG. 16. [Figure 18] 17A to 17C are elevation views showing variations of the vertical attitude maintaining member shown in FIG. 16. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] An embodiment of a rod connection structure in a soil improvement device according to the present invention will be described with reference to the drawings. As shown in Fig. 7, this connection structure consists of a rotation device 5 and a hydraulic auger (excavation and mixing device) 6 connected to the lower end via a rod 1, and is implemented when connecting the rods 1 to each other or when connecting the rod 1 to the rotation device 5. In other words, the rods 1 are reliably connected, and the hydraulic auger 6 is penetrated into the soft ground 2 while excavating it, and at the same time, a stabilizer such as cement milk is discharged by penetration discharge or pull-up discharge, and mixed and stirred with the in-situ soil, thereby being suitably used in a mechanical mixing and deep mixing treatment method for constructing ground improvement piles or ground improvement bodies within a desired range. As will be described later, an angle measurement cable C is inserted through cable holes 14 provided inside the multiple connected rods 1, cable holes 81 in the male hexagonal convex portion 8, cable holes 91 in the female hexagonal concave portion 9, and cable holes 52 provided inside the protrusion 50 of the rotation device 5, and the angle measurement cable C is connected to an inclination angle measuring device T as shown in Figure 5, so that the inclination angle of the hydraulic auger 6 can be freely measured using the inclination angle measuring device T. That is, as shown in Figure 6, two GNSS antennas Y attached near the top of rod 1 are used to calculate the three-dimensional coordinates of the center of the top of rod 1 and the azimuth angle of rod 1. The three-dimensional coordinates of the bottom end of rod 1 are calculated by calculating the horizontal movement of the bottom end of rod 1 from the measurement data of the two-way inclinometer t attached to the bottom end of rod 1. Then, the three-dimensional coordinates of the tip of the hydraulic auger are calculated and the inclination angle of the hydraulic auger 6 is measured using the rotation angle of the hydraulic auger 6 in the vertical plane measured with the inclination angle measuring device T of the two-way inclinometer attached to the hydraulic auger 6 side of the rotation device 5 (see Figure 5). In this specification, "ground improvement pile" refers to a vertical straight pile with a circular cross section, as well as a nodular pile or a specially shaped pile (irregular pile) formed by expanding or tilting a portion of it, and "ground improvement body" refers to a wall-like formation formed by constructing the above-mentioned ground improvement piles continuously in one direction.

[0018] First, the configuration of the ground improvement device of this embodiment will be described. This ground improvement device has a vertical rotor 3, which serves as a rotation device 5, installed above a hydraulic auger 6, and the vertical rotor 3 can be driven by a motor of the ground improvement device. The vertical rotor 3 is based on the two-dimensional type shown in FIG. 8A and is configured with left and right vertical sections 31, 31 connected to a horizontal shaft section 30, supported by vertically arranged support sections 32, 32 on both sides via bearings that allow for free rotation in a vertical plane. Each of the left and right vertical sections 31, 31 can rotate 90 degrees left and right in a vertical plane, tilting and rotating at any desired angle within a maximum range of 180 degrees. The lower ends of the vertical sections 31, 31 are connected to a horizontal, plate-shaped lower surface 34, the underside of which is connected to a hydraulic auger 6. Meanwhile, the upper ends of the support sections 32, 32 are connected to a horizontal, disk-shaped upper surface 33, the center of which has a protrusion 50 (corresponding to the shaft) that protrudes upward. This protrusion 50 is attachable to a rod 1 via a male hexagonal protrusion 50A, as described below (see FIG. 4).

[0019] This can also be suitably implemented in a ground improvement device using a three-dimensional type rotation device 5 shown in Figure 8B. This ground improvement device is configured such that the upper end of the vertical sections 32, 32 of the vertical rotation body 3 is connected to the lower end of a horizontal section 41 of a horizontal rotation body 4, which is supported on a vertical shaft section 40 and has a horizontal section 41 via bearings that are rotatable in a horizontal plane. A protrusion 50 is provided on the vertical shaft section 40 (see Figures 8A and 4), and the rotation device 5 can be freely attached to the rod 1 using this protrusion 50, as in the two-dimensional type. Therefore, with this three-dimensional type rotation device 5, the hydraulic auger 6 can be tilted in a vertical plane by the vertical section 31 of the vertical rotation body 3 within a range of up to 180 degrees, and can be rotated in a horizontal plane by the horizontal section 41 of the horizontal rotation body 4 within a range of 360 degrees. By combining these tilt angles and rotation angles, free three-dimensional ground improvement can be performed.

[0020] The hydraulic auger 6 connected to the lower end of the rotating device 5 has, for example, a built-in motor and is configured to operate by receiving hydraulic pressure from a hydraulic device provided in the backhoe 7. An electric auger may be used instead of the hydraulic auger 6 in the same manner. The hydraulic auger 6 consists of an inner cylinder and an outer cylinder, each about 2 m high, and the inner cylinder is installed on the underside 34 at the bottom end of the rotating device 5. Agitating blades 63 are attached to the outer peripheral surface of the rotating outer cylinder, and a long spiral drilling body 64 equipped with a tip drilling bit 65 is attached to the bottom end of the outer peripheral surface. In Figure 8A, reference numeral 66 indicates the cement milk discharge port, reference numeral 67 indicates the intermediate cement milk discharge port, reference numeral 68 indicates the cement milk connection port which switches between normal discharge and downward discharge, and reference numeral 69 indicates the hydraulic piping.

[0021] Thus, with the above-mentioned two-dimensional type ground improvement device, as shown in Figure 7, by simply placing the upper end of the vertical rotor 3 (rotation device) on the lower end of the rod 1, the hydraulic auger 6 can be tilted in the desired direction S on the vertical plane as needed using the vertical rotor 3, thereby constructing ground improvement piles of the desired shape. Also, with a ground improvement device equipped with a three-dimensional type rotation device 5, the hydraulic auger 6 can be tilted in the desired direction S on the vertical plane using the rotation device 5 as needed, and rotated in the desired direction on the horizontal plane (not shown), thereby constructing ground improvement bodies and ground improvement piles of the desired shape within the desired range.

[0022] The rods 1 in the soil improvement device having the above-described configuration of this embodiment are connected to each other in the following manner. As shown in the lower diagram of Figure 1, the upper connection end K1 of the rod 1 is formed as a male rod end 10 with a non-through pin hole 80, while as shown in the upper diagram of Figure 1, the lower connection end K2 of the rod 1 is formed as a female rod end 11 with a through pin hole 90. Several rods 1, each 2 m or 4 m in length, are connected together as described below. A cable hole 14 is provided in the axial direction at the center of the interior of the rod 1, which is approximately φ=500 mm, and an angle measurement cable C is inserted into this cable hole 14. In addition, five hydraulic hoses 12, three for the hydraulic augers 6 and two for the vertical rotors 3 (rotation device 5), and one slurry hose 13 are arranged and built into the rod 1 as described below, surrounding the outer periphery of the cable hole 14 (see the upper and lower diagrams in Figure 3A and the lower diagram in Figure 3B).

[0023] The upper connection end K1 of the rod 1 will now be described. As shown in Figure 3A, the connecting end K1 at the upper end of the rod 1 is formed into a male hexagonal protrusion 8 that protrudes in a hexagonal shape for transmitting rotation. The maximum outer diameter of this male hexagonal protrusion 8 is set to about 115 mm so that it can be accommodated in the rod 1 (φ = about 156 mm). The height of the protrusion is set to about 85 mm so that it can fit into the female hexagonal recess 9 of the female rod end 11, which will be described later. An O-ring 85 for external watertightness is provided at the central positioning portion 84 on the outer periphery of the lower part, and the outer periphery of the O-ring 85 is set to approximately φ=130 mm so that it fits tightly into the female hexagonal recess 9 described below. Inside the male hexagonal protrusion 8, a cable hole 81 is provided in the center in the axial direction, through which the angle measurement cable C is inserted. Five sockets 82 with port holes are provided in the circumferential direction on the outer periphery of the central cable hole 81. The linked hydraulic hose 12 and slurry hose 13 are connected to these sockets 82. An O-ring 86 for port hydraulic pressure is provided on the outer periphery of the sockets 82. Three equally spaced non-through pin holes 80 are provided on the side of this male hexagonal protrusion 8, leading to a central cable hole 81 (see the lower diagram in Figure 3A). The pin holes 80 mate with pin holes 90 in the female rod end 11, which will be described later, and are used for vertical positioning (see Figure 2). The connection portions between the base ends of the five hydraulic hoses 12 and one slurry hose 13 connected to the socket 82 with port holes and the upper ends of the five short hydraulic hoses 12 and one short slurry hose 13 inside the rod 1 are each connected via a hose connection nipple 83, and a male hexagonal protrusion 8 is welded to the upper end of the rod 1.

[0024] The lower connecting end K2 of the rod 1 will now be described. As shown in Figure 3B, the connecting end K2 at the lower end of the rod 1 having the male hexagonal protrusion 8 at its upper end is formed into a female hexagonal recess 9 that is recessed into a hexagonal shape for transmitting rotation. As with the hexagonal male hexagonal protrusion 8 described above, the maximum outer diameter of this female hexagonal protrusion 9 is also set to about 115 mm and the height of the recess is set to about 85 mm so that the rod 1 (φ=about 156 mm) can be accommodated therein. As shown in the lower diagram of Figure 3B, the upper end of this female hexagonal recess 9 has five port holes 92 arranged circumferentially around the outer periphery of the central cable hole 91, into which the sockets 82 of the male hexagonal protrusion 8 described above fit and receive. Furthermore, three through-type pin holes 90 are provided at equal intervals on the side of the female hexagonal protrusion 9, which point toward the central cable hole 91. These pin holes 90 mate with the pin holes 80 of the male hexagonal protrusion 8 described above, and are used for vertical positioning. The base ends of the short hoses (for the hydraulic hose 12 and the slurry hose 13) connected to the base ends of the port holes 91 of the female hexagonal recess 9 are connected to the lower ends of the hydraulic hose 12 and the slurry hose 13 in the rod 1 via hose connection nipples 93, and the female hexagonal recess 9 is welded to the lower end of the rod 1.

[0025] Therefore, the upper and lower rods 1 are connected to each other by connecting the opposing hydraulic hoses 12 and the slurry hoses 13 at the connecting part K, and with the male hexagonal convex part 8 and the female hexagonal concave part 9 connected, the connecting pin 8 inserted from the side into the matching pin holes 80, 90 is fixed via the coupler R (see Figure 2). The angle measurement cable C inserted through the cable hole 14 inside the rod 1 is also connected to the inclination angle measuring device T at the connection point K between the rods 1 through the cable hole 81 in the male hexagonal convex portion 8 and the cable hole 91 in the female hexagonal concave portion 9, and the inclination angle of the hydraulic auger 6 can be measured by the inclination angle measuring device T connected to the PC system on the ground. In this way, while measuring the tilt angle of the hydraulic auger 6, the hydraulic auger 6 is tilted in the desired direction S in the vertical plane within a range of rotation of up to 180 degrees by the left and right vertical parts 31 of the vertical rotor 3 connected to the lower end of the rod 1, and a ground improvement pile or ground improvement body of the desired shape is created within the desired range (see Figure 7).

[0026] Next, the connection between the rod 1 at the lowest end and the rotation device 5 on the hydraulic auger 6 side will be described. FIG. 5 shows a rotation device 5 of this embodiment. At the upper end of the rotating device 5, a male hexagonal protrusion 50A consisting of the protrusion 50 with a pin hole 51 is provided on top of a protrusion 50 (corresponding to a shaft) provided at the upper end of the vertical rotor 3 that constitutes the rotating device 5. The male hexagonal protrusion 50A of the rotating device 5 has the same structure as the male hexagonal protrusion 8 of the rod 1 described above. In short, inside the male hexagonal protrusion 50A, a cable hole 52 is provided in the center in the axial direction, through which the angle measurement cable C is inserted, while three non-through pin holes 51 are provided at equal intervals on the side surface, which mate with pin holes 90 on the female rod end 12 on the rod 1 side. Also, five sockets 55 with port holes are provided in the circumferential direction on the outer periphery of the cable hole 81, and short hydraulic hoses 53 and slurry hoses 54 connected to each other inside are connected to the hydraulic hoses 12 and slurry hoses 13 on the connected rod 1 side, respectively. Therefore, the opposing hydraulic hoses 12 and the slurry hoses 13 are connected to each other, and the female rod end 9 of the lowest rod 1 is connected to the male hexagonal protrusion 50A of the rotating device 5, and the connecting pin 8 inserted into the matching pin holes 51, 90 is fixed via the coupler R (detailed drawing omitted).

[0027] The upper structure of the rotation device 5 shown in FIG. 5 will be described. A hydraulic hose 53 extends from the side of the protruding portion 50 and is connected to a swivel J for the hydraulic hose 53 on the outer surface of the support portion 32, which is disposed vertically on the left and right sides of the vertical rotor 3, and then connected to the hydraulic auger 6. An inclination angle measuring instrument T for measuring the inclination of the hydraulic auger 6 is installed on the top of the swivel J (and the bottom, as shown, if necessary). An outlet E is provided in the center or side of the underside of the protruding portion 50, and the angle measurement cable C is inserted through a cable hole 52 in the male hexagonal protrusion 50A (protruding portion 50) and drawn out from the outlet E. An inclinometer T for measuring the inclination of the rod 1 is preferably provided on the top surface 33 of the vertical rotor 3 (see FIG. 7). Furthermore, an angle-shaped hose guard G (mainly made of metal) is fixed to the top surface 33 of the vertical rotor 3, covering the swivel J and the inclination angle measuring instrument T. The slurry hose 54 extends from the side of the protruding portion 50 and is connected to the hydraulic auger 6. In Fig. 5, reference numeral 30 denotes a horizontal shaft portion, and reference numeral 63 denotes an agitating blade.

[0028] Next, FIG. 9 shows an embodiment in which a soil improvement device having the above-mentioned rod 1 connection structure is provided with a horizontally long vertical position maintaining member 15 for maintaining the vertical position of the rod 1.

[0029] In the present invention, a ground improvement device rotates the hydraulic auger 6 itself without rotating the rod 1, allowing free vertical rotation using the vertical rotor 3, or free horizontal rotation using the horizontal rotor 4. During ground improvement, stabilizers (e.g., cement slurry) and the improved ground are mixed and stirred to form a soft, unsolidified soil. Therefore, a reaction force is required to stably rotate the hydraulic auger 6, especially during vertical rotation using the vertical rotor 3. Without this reaction force, the rod 1 becomes more likely to misalign as it becomes longer (deeper), making it difficult to maintain its vertical position with the restraint provided by commonly used anti-vibration devices. This misalignment of the rod 1 complicates control of the hydraulic auger 6 and also poses concerns about the quality of the improved ground, making it an issue that requires improvement. If it were possible to prevent (suppress) misalignment of the rod 1, that is, if it were possible to maintain the vertical position of the rod 1, it would be possible to control the hydraulic auger 6 in a stable state and with good control, and it would also be possible to construct improved ground of excellent quality, so it would clearly be more beneficial. Therefore, in the present invention, as shown in Figure 9, etc., the vertical posture maintaining member 15 was developed to prevent (suppress) misalignment of the rod 1 even during vertical rotation by the vertical rotating body 3.

[0030] 10A and 10B, the vertical posture maintaining member 15 is provided on the upper surface 33 of the rotation device 5, and includes two horizontally long parallel rod-shaped members 15a and two vertically long connecting plate members 15b that connect both ends of the two parallel rod-shaped members 15a and integrate them into a frame shape by means of welding or the like, and the two parallel rod-shaped members 15a are arranged to sandwich the rod 1 when viewed from above. Incidentally, the reference numeral 15c in the drawings denotes a metallic reinforcing member (diagonal member). Specifically, in this embodiment, an H-shaped steel beam with its web oriented vertically is used as the bar-shaped member 15a, and the rod 1 is disposed in the center of the bar-shaped member 15a. A steel plate is preferably used for the connecting plate member 15b. In this embodiment, the lower flange surface in the center of the bar-shaped member (H-shaped steel beam) 15a and the upper surface 33 of the rotation device 5 are integrated by welding, but this is not limited thereto, and a detachable structure such as bolt connection may also be used.

[0031] The size of the vertical positioning member 15 can be modified as appropriate depending on the structural design. In this embodiment, as an example only, the rod-shaped member (H-beam) 15a has a flange width of approximately 100 mm, a web height of approximately 100 mm, and a length of approximately 3850 mm. The vertically elongated connecting plate member 15b has a height (see symbol H in FIG. 10A) of approximately 600 mm, a width (see symbol W in FIG. 10B) of approximately 450 mm, and a plate thickness of approximately 22 mm. The reinforcing member (diagonal member) has a plate thickness of approximately 22 mm and a length of approximately 400 mm. For example, the vertical positioning member 15 in the illustrated example is wider than the mixing blade 63, but it can of course also be implemented with approximately the same width (length).

[0032] According to the ground improvement device equipped with this vertical posture maintaining member 15, the hydraulic auger 6 penetrates into the improved ground while excavating the soft ground 2, and a stabilizing material (e.g., cement slurry) is discharged by penetration discharge or pull-up discharge, and the vertical posture maintaining member 15 remains stationary (non-rotating) and is buried in the soft improved soil before it is stirred and mixed with the in-situ soil (improved ground) and solidified. The vertical attitude maintaining member 15, which is fully buried in the improved soil and in a stationary state, acts as a resistance member in the improved soil, preventing (suppressing) the vibration of the rod 1 and maintaining the vertical attitude of the rod 1. If the vertical attitude of the rod 1 can be maintained, the hydraulic auger 6 can be well controlled in a stable state, and ultimately improved ground of excellent quality can be achieved.

[0033] Figures 11 and 12 show examples of construction work carried out to confirm the effectiveness of the ground improvement device shown in Figures 9 and 10. Incidentally, in the ground improvement device shown in Figures 11 and 12, the anti-vibration members 16 are installed as high above the ground surface as possible compared to normal construction in order to economically and efficiently prevent a situation in which the vertical rotation device 3 (rotation device 5) and the anti-vibration members 16 are separated and misalignment is likely to occur.

[0034] The ground improvement device shown in Figure 11 shows an example of a configuration in which the left and right vertical sections 31 are rotated 33 degrees left and right on a vertical plane by the vertical rotor 3. In this example, the excavation width and the horizontal length of the vertical positioning member 15 are approximately equal (3.894 m in this example), so both ends of the vertical positioning member 15 abut against the unimproved portion of the ground, ensuring a positive reaction force. As a result, the vertical positioning member 15 prevents the rod 1 from swinging when penetrated into the improved ground. This prevents the rod 1 from misaligning even during vertical rotation by the vertical rotor 3, confirming that good ground improvement work can be performed.

[0035] Figure 12 shows an example of the ground improvement device, in which the vertical rotor 3 rotates the left and right vertical sections 31 45 degrees to the left and right in a vertical plane. In this example, the horizontal length of the vertical positioning member 15 (3.894 m) is shorter than the excavation width (4.540 m). In this case, the excavation width is longer (wider) than the vertical positioning member 15, so a reaction force due to the vertical positioning member 15 abutting the unimproved portion, as shown in Figure 11, cannot be expected. However, when the vertical positioning member 15 is fully embedded in the improved soil, it resists the improved soil, ensuring a reaction force, preventing the rod 1 from swinging. Therefore, as with the ground improvement device shown in Figure 11, it was confirmed that misalignment of the rod 1 can be prevented even during vertical rotation by the vertical rotor 3, enabling successful ground improvement work.

[0036] 11 and 12, it is possible to prevent (suppress) misalignment of the rod 1 and maintain the vertical position of the rod 1 even during vertical rotation by the vertical rotor 3. Because the vertical position of the rod 1 can be maintained, it is possible to effectively control the hydraulic auger 6 in a stable state, perform effective ground improvement work, and ultimately achieve improved ground of excellent quality.

[0037] 13 to 15 show an embodiment of a soil improvement device equipped with a vertical attitude maintaining member 25 that is different from the vertical attitude maintaining member 15 shown in FIGS. The vertical posture maintaining member 25 is detachably attached to the lower part of the rod 1 and consists of a pair of left and right vertical posture maintaining member pieces 25a each having a semi-cylindrical flanged (steel) joint part 26 that connects to surround the rod 1 and a main body part 27, the main body part 27 consisting of a plurality of horizontally long parallel plate-like members (steel plates) 27a and a blocking member (such as an arc-shaped steel plate in a plan view) 27b that connects one end of the plate-like members 27a, the other end of which is connected to the joint part 26. Specifically, the components (joints 26, plate-like members 27a, and closing members 27b) that make up the vertical attitude maintaining member 25 are, for example, made of metal plates (steel plates) with a thickness of about 22 mm, and are joined together by joining means such as welding. The horizontal length of the vertical attitude maintaining member 25 is about 3000 mm, the horizontal length of the pair of left and right vertical attitude maintaining member pieces 25a is about 1500 mm, the height of the plate-like members (steel plates) 27a (see FIG. 13) is about 350 mm, and the height of the closing members 27b (see FIG. 13) is about 600 mm. Note that the above dimensions are merely examples and can be modified as appropriate depending on the structural design.

[0038] With the ground improvement device equipped with this vertical positioning member 25, the hydraulic auger 6 penetrates the improved ground while excavating the soft ground 2, and a stabilizer (e.g., cement slurry) is dispensed by penetration or lifting. The vertical positioning member 25 remains stationary (non-rotating) and is embedded in the soft improved soil before it is mixed with the in-situ soil (improved ground) and solidifies. The stationary vertical positioning member 25 still functions as a resistance member in the improved soil, similar to the vertical positioning member 15 shown in Figures 9 to 12, and thus prevents (suppresses) the swing of the rod 1 and maintains the vertical position of the rod 1. Maintaining the vertical position of the rod 1 allows for stable and effective control of the hydraulic auger 6, ultimately resulting in improved ground of high quality.

[0039] 16 and 17 show an embodiment of the soil improvement device equipped with a vertical attitude maintaining member 35 different from those shown in FIGS. 9 to 12 and 13 to 15. In FIGS. 13 to 15, the vertical posture retaining member 35 differs from the vertical posture retaining member 25 shown in FIGS. 13 to 15 in that, instead of the horizontally elongated parallel plate-like members 27a between the joint portion 26 and the blocking member 27b, multiple horizontally elongated parallel plate-like members (steel plates) 36a (three in the illustrated example) and connecting plates (steel plates) 36b connecting both ends of the plate-like members 36a are integrated by welding to form a member unit 36, which can be joined as needed by bolts 37. The reference numeral 38 in the figures indicates a stiffener. It should be noted that the embodiment shown in FIG. 18 is a variation based on the same concept, although the detailed structure differs from that shown in FIGS. 16 and 17.

[0040] With the ground improvement device equipped with this vertical positioning member 35, the hydraulic auger 6 penetrates the improved ground while excavating the soft ground 2, and a stabilizer (e.g., cement slurry) is dispensed by penetration or lifting. The vertical positioning member 35 remains stationary (non-rotating) and is embedded in the soft improved soil before it is mixed with the in-situ soil (improved ground) and solidified. The stationary vertical positioning member 35 still functions as a resistance member in the improved soil, similar to the vertical positioning members 15 and 25 shown in Figures 9 to 12 and 13 to 15, and thus prevents (suppresses) the swing of the rod 1 and maintains the vertical position of the rod 1. Maintaining the vertical position of the rod 1 allows for stable and effective control of the hydraulic auger 6, ultimately resulting in improved ground of high quality.

[0041] Although the embodiments of the present invention have been described above based on the drawings, it should be noted that the present invention is not limited to the illustrated examples and includes the range of design modifications and application variations that are normally made by those skilled in the art, provided that they do not deviate from the technical concept of the present invention. For example, the shape of the hydraulic auger (excavation and stirring device) 6 can be appropriately changed in design depending on the structural design, as shown in variations in Figures 8, 9, or 13, and the shape of the vertical rotor 3 (rotation device 5) can also be appropriately changed in design depending on the structural design, as shown in variations in Figures 4, 5, or 8. [Explanation of symbols]

[0042] 1 rod 10 Male Rod End 11 Female rod end 12 hydraulic hoses 13 Slurry hose 14 Cable hole 2 Soft ground 3 Vertical Rotating Body 30 Horizontal shaft section 31 Vertical section 32 Support part 33 Top part 34 Bottom part 4 Horizontal Rotating Body 40 Vertical shaft section 41 Horizontal section 5 Rotating device 50 Protrusion 50A male hexagonal protrusion 51 pin holes 52 Cable hole 53 Hydraulic hose 54 Slurry hose 6 Hydraulic auger (excavation and mixing device) 63 Mixing blade 64 Excavation body 65 Tip Drilling Bit 66 Cement milk outlet 67 Cement milk intermediate outlet 68 Cement milk connection switch 69 Hydraulic piping 7. Backhoe 70 Arm 8 Male hexagonal protrusion 80 pin holes (non-through type) 81 Cable hole 82 port hole socket 83 Hose connection nipple 84 Center positioning part 85 O-ring 86 O-ring 9 Female hexagonal protrusion 90 pin hole (through type) 91 Cable 92 port holes 93 Hose connection nipple P connecting pin T Inclination Angle Measuring Instrument C Angle measurement cable K connection part K1 Connection end (upper) K2 Connection end (lower) S Desired direction 15 Vertical position maintaining member 15a Rod-shaped member 15b Connecting plate member 15c Reinforcement (diagonal member) 16 Anti-vibration member 25 Vertical position maintaining member 26 Flanged joint 27 Main body 25a Vertical position maintaining member piece 27a Plate-shaped member 27b Closure member 35 Vertical position maintaining member 36 component units 36a Plate-shaped member 36b Connecting plate 37 volts 38 Stiffener

Claims

1. A ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is inserted into the soft ground while excavating the soft ground, and stabilizer material is discharged by penetration discharge or lift discharge, and then stirred and mixed with the in-situ soil to create ground improvement piles or ground improvement bodies. (a) The ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, the rotating device being a vertical rotating body having a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions being configured to rotate 90 degrees left and right on a vertical plane, within a maximum range of 180 degrees, the hydraulic auger being connected to the left and right vertical portions of the vertical rotating body, and the upper end of the vertical rotating body being attachable to the lower end of the rod, (b) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole; (c) an angle measurement cable is inserted into a cable hole provided inside the rod, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device; (d) The left and right vertical portions of the vertical rotor connected to the lower end of the rod tilt the hydraulic auger in the desired direction of the vertical plane within the range of rotation of up to 180 degrees, so that a ground improvement pile or ground improvement body of the desired shape is constructed within the desired range. A rod connection structure in a ground improvement device, characterized by the above.

2. A ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is inserted into the soft ground while excavating the soft ground, and stabilizer material is discharged by penetration discharge or lift discharge, and then stirred and mixed with the in-situ soil to create ground improvement piles or ground improvement bodies. (a) The ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, the rotating device being a vertical rotating body having a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions being configured to rotate 90 degrees left and right on a vertical plane, within a maximum range of 180 degrees, the hydraulic auger being connected to the left and right vertical portions of the vertical rotating body, and the upper end of the vertical rotating body being attachable to the lower end of the rod, (b) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole, and the connection between the lowest rod and the rotating device is such that the connection between a protrusion with a pin hole on the top of a vertical rotating body that constitutes the rotating device and the opposing female rod end at the lowest end is fixed by a connecting pin inserted into the matching pin hole, (c) An angle measurement cable is inserted through the cable holes provided in the rod and the vertical rotor, respectively, via the protrusion, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device. (d) The left and right vertical portions of the vertical rotor connected to the lower end of the rod tilt the hydraulic auger in the desired direction of the vertical plane within the range of rotation of up to 180 degrees, so that a ground improvement pile or ground improvement body of the desired shape is constructed within the desired range. A rod connection structure in a ground improvement device, characterized by the above.

3. A ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is inserted into the soft ground while excavating the soft ground, and stabilizer material is discharged by penetration discharge or lift discharge, and then stirred and mixed with the in-situ soil to create ground improvement piles or ground improvement bodies. (a) The ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, and the rotating device comprises a combination of a vertical rotating body and a horizontal rotating body; (b) the vertical rotor comprises a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions rotate 90 degrees left and right on the vertical plane, and rotate within a maximum range of 180 degrees, the upper end of the vertical rotor is connected to the horizontal rotor, the hydraulic auger is connected to the left and right vertical portions of the vertical rotor, and the horizontal rotor comprises a vertical shaft portion and a horizontal portion journaled on the vertical shaft portion and rotatable within a range of 360 degrees on a horizontal plane, the horizontal portion of the horizontal rotor is connected to the vertical rotor, and the vertical shaft portion of the horizontal rotor is attachable to the lower end of the rod; (c) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole; (d) an angle measurement cable is inserted into a cable hole provided inside the rod, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device; (e) The left and right vertical portions of the vertical rotating body of the rotating device connected to the lower end of the rod tilt the hydraulic auger in the desired direction of the vertical plane within the range of rotation of up to 180 degrees, and the horizontal portion of the horizontal rotating body of the rotating device rotates the hydraulic auger in the desired direction of the horizontal plane, so that a ground improvement pile or ground improvement body of the desired shape is constructed in the desired range. A rod connection structure in a ground improvement device, characterized by the above.

4. A ground improvement device used in a mechanical mixing and deep mixing treatment method in which a rod is inserted into the soft ground while excavating the soft ground, and stabilizer material is discharged by penetration discharge or lift discharge, and then stirred and mixed with the in-situ soil to create ground improvement piles or ground improvement bodies. (a) The ground improvement device comprises a rotating device connected to the rod and a hydraulic auger, and the rotating device comprises a combination of a vertical rotating body and a horizontal rotating body; (b) the vertical rotor comprises a horizontal shaft portion and left and right vertical portions connected to both ends of the horizontal shaft portion and rotatable on a vertical plane, the left and right vertical portions rotate 90 degrees left and right on the vertical plane, and rotate within a maximum range of 180 degrees, the upper end of the vertical rotor is connected to the horizontal rotor, the hydraulic auger is connected to the left and right vertical portions of the vertical rotor, and the horizontal rotor comprises a vertical shaft portion and a horizontal portion journaled on the vertical shaft portion and rotatable within a range of 360 degrees on a horizontal plane, the horizontal portion of the horizontal rotor is connected to the vertical rotor, and the vertical shaft portion of the horizontal rotor is attachable to the lower end of the rod; (c) The connection of the rods, which consist of a plurality of rods, is such that the connection end of one of the rods is a male rod end with a pin hole and the connection end of the other rod is a female rod end with a pin hole, and the opposing male rod end and female rod end are connected and fixed by a connecting pin inserted into the matching pin hole, and the connection of the rod at the lowest end to the rotating device is such that the protrusion with a pin hole on the top of the horizontal rotating body that constitutes the rotating device and the opposing female rod end at the lowest end are connected and fixed by a connecting pin inserted into the matching pin hole, (d) An angle measurement cable is inserted through the cable holes provided in the rod, the vertical rotor, and the horizontal rotor via the protrusion, and the angle measurement cable is connected to an inclination angle measuring device, so that the inclination angle of the hydraulic auger can be measured freely by the inclination angle measuring device. (e) The left and right vertical portions of the vertical rotating body of the rotating device connected to the lower end of the rod tilt the hydraulic auger in the desired direction of the vertical plane within the range of rotation of up to 180 degrees, and the horizontal portion of the horizontal rotating body of the rotating device rotates the hydraulic auger in the desired direction of the horizontal plane, so that a ground improvement pile or ground improvement body of the desired shape is constructed in the desired range. A rod connection structure in a ground improvement device, characterized by the above.

5. A hydraulic hose and a slurry hose are respectively built into the rod, and the opposing hydraulic hoses and the opposing slurry hoses are connected to each other at a connecting portion between the male rod end and the female rod end.

5. A rod connection structure in a ground improvement device according to claim 1, 2, 3 or 4, characterized in that:

6. a hydraulic hose and a slurry hose are respectively built into the rod and the vertical or horizontal rotor, and the opposing hydraulic hoses and the opposing slurry hoses are connected to each other at a connecting portion between the protrusion and the female rod end; 5. A rod connection structure in a ground improvement device according to claim 2 or 4, characterized in that:

7. a vertical position holding member that is long in the horizontal direction is provided on the upper surface of the rotation device or on the rod to hold the rod in a vertical position; 5. A rod connection structure in a ground improvement device according to claim 1, 2, 3 or 4, characterized in that:

8. the vertical attitude maintaining member is detachably provided on the upper surface of the rotating device or on the rod; 8. The rod connection structure in the soil improvement device according to claim 7, wherein:

9. the vertical posture maintaining member comprises two parallel rod-shaped members that are long in the horizontal direction, and two connecting plate members that are long in the vertical direction and that connect both ends of the two parallel rod-shaped members to each other to form a frame, and the two parallel rod-shaped members are arranged so as to sandwich the rod when viewed from above; 8. The rod connection structure in the soil improvement device according to claim 7, wherein:

10. The rod-shaped member is an H-shaped steel with its web oriented vertically; 10. The rod connection structure in the soil improvement device according to claim 9.

11. the vertical attitude maintaining member is composed of a pair of left and right vertical attitude maintaining member pieces each having a semi-cylindrical flanged joint portion that connects to the rod so as to surround it, and a main body portion, the main body portion being composed of a plurality of parallel plate-like members that are long in the horizontal direction and a closing member that connects one end of the plate-like members, the other end of the plate-like members being connected to the joint portion; 8. The rod connection structure in the soil improvement device according to claim 7, wherein:

12. Between the joint portion and the blocking member, instead of the plurality of parallel plate-like members that are long in the horizontal direction, a member unit consisting of a plurality of parallel plate-like members that are long in the horizontal direction and a connecting plate that connects both ends of the plate-like members can be added as needed to adjust the horizontal length; The rod connection structure in the soil improvement device according to claim 11,

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