JP2020153155A - Agitation device, and mechanical agitation method using the same - Google Patents

Abstract

To suppress movement frequency of a heavy machine in a mechanical agitation method, to improve work efficiency.SOLUTION: An agitation device 10 includes: a rod portion 12 constituting a main body portion of a device; a pair of agitation blades 14 attached to a tip of the rod portion 12; an attaching portion 30 for attaching the rod portion to a work device of a heavy machine; and a bending mechanism 40. The bending mechanism 40 bends a part from a middle to a tip of the rod portion 12 to the heavy machine side with respect to an extending direction of the rod portion 12 utilizing driving force applied from the heavy machine. Thus, even when an obstacle such as piping exists in the ground, the agitation device 10 can agitate a lower part of the obstacle and the like with the bent rod portion 12 without moving the heavy machine while avoiding the obstacle. So, movement frequency of a heavy machine under construction can be suppressed, and work efficiency can be improved.SELECTED DRAWING: Figure 2

Description

The present invention relates to a stirring device that is attached to a working machine of a heavy machine and stirs the ground while supplying an improved material and / or air, and a mechanical stirring method using the stirring device.

When constructing various buildings, if the local ground is soft, ground improvement will be carried out. There are various construction methods for ground improvement, and one of them, the mechanical stirring method, is a construction method in which the ground forming soil and the improving material are mixed and stirred by a rotating stirring blade to create an improved body in the ground. is there. A stirring device provided with such a stirring blade is usually used by being mounted on a heavy machine, and various measures have been taken for the purpose of improving the efficiency of construction (see, for example, Patent Documents 1 to 3). ..

Japanese Unexamined Patent Publication No. 2007-277955 Japanese Patent No. 5203167 Japanese Patent No. 4038525

Here, in the mechanical stirring method using the conventional stirring device described above, for example, when an obstacle exists in the ground, the heavy machine is moved each time in order to avoid the obstacle and perform stirring. I needed it. Further, in order to form the end portion of the improved body in a plane, it is necessary to arrange the heavy machine in a direction substantially orthogonal to the plane, and in this case as well, the heavy machine is obliged to move. Such movement of heavy machinery during construction is a factor that deteriorates work efficiency.
The present invention has been made in view of the above problems, and an object of the present invention is to suppress the frequency of movement of heavy machinery in the mechanical stirring method and improve work efficiency.

(Aspect of the invention)
The following aspects of the invention exemplify the configurations of the present invention, and will be described separately in order to facilitate understanding of the various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the components of each section are replaced, deleted, or the like while taking into consideration the best mode for carrying out the invention. Those to which the above-mentioned components are added can also be included in the technical scope of the present invention.

(1) A stirring device attached to a heavy machine working machine that agitates the ground while supplying improved materials and / or air, while rotating using the rod portion and the power supplied from the heavy machine. The ground is agitated by a plurality of cutting blades provided on the outer periphery, and a pair of stirring blades attached to the tip of the rod portion so that its rotation axis is orthogonal or substantially orthogonal to the extending direction of the rod portion, and the above. With the mounting portion for mounting the rod portion to the working machine so that the tip of the rod portion faces downward in front of the heavy machine and the pair of stirring blades are located on the left side and the right side in the lateral direction of the heavy machine. Agitator provided with a refraction mechanism for refracting from the middle portion to the tip of the rod portion toward the heavy machine side with respect to the extending direction of the rod portion by utilizing the power supplied from the heavy machine. Device (claim 1).

The stirring device described in this section includes a rod portion, a pair of stirring blades attached to the tip of the rod portion, and an attachment portion for attaching the rod portion to the working machine. Each of the pair of stirring blades is rotated by the power supplied from the heavy machine, and the ground is stirred by a plurality of cutting blades provided on the outer circumference while rotating. Further, the pair of stirring blades are attached to the tip of the rod portion so that the respective rotation axes are orthogonal to or substantially orthogonal to the extending direction of the rod portion. As a result, a plurality of cutting blades that rotate and move along the outer circumference of the stirring blade are directed in the direction in which the tip of the rod portion faces. Further, the rod portion is attached to the work machine by the attachment portion so that the tip of the rod portion faces downward in front of the heavy machine and the pair of stirring blades are located on the left side and the right side in the lateral direction of the heavy machine. .. For this reason, the plurality of cutting blades of the stirring blades are mainly used downward, and the ground forming soil and the improving material and / or air are mixed and stirred while the ground is excavated by such a pair of stirring blades. To.

Further, the stirring device described in this section is provided with a refraction mechanism, and the refraction mechanism utilizes the power supplied from the heavy machine to extend the rod portion from the middle portion to the tip portion in the extending direction of the rod portion. It is refracted toward the heavy machinery side. As a result, the tip of the rod portion is directed not only in the extending direction of the rod portion but also in the direction of the heavy machine where the rod portion is bent, so that the direction of excavation and stirring can be switched without moving the heavy machine. Will be. In particular, even when an obstacle such as a pipe is present in the ground, the lower part of the obstacle is agitated while avoiding the obstacle by the bent rod portion without moving the heavy machine. Therefore, the frequency of movement of heavy machinery during construction is suppressed, and work efficiency is improved.

(2) In the above item (1), using the power supplied from the heavy machine, the rod portion is rotated counterclockwise with the axis parallel to the extending direction of the rod portion in the non-refractive state as the rotation axis. A stirring device (claim 2) including a shaft rotation mechanism for rotating the shaft by at least 90 ° in each clockwise direction.
The stirring device described in this section further includes a shaft rotation mechanism, which is parallel to the extending direction of the rod portion in the non-refractive state by utilizing the power supplied from the heavy machine. The rod portion is rotated around the shaft as a rotation shaft. The shaft rotation of the rod portion by this shaft rotation mechanism is rotated in a range of at least 90 ° in each of counterclockwise rotation and clockwise rotation, that is, at least 180 ° with respect to the front direction of the working machine.

Here, when improving the ground using a stirring device, in order to form the end of the construction range (improved body) in a plane, considering the mounting direction of the stirring blade, the plane of the improved body is usually used. It is necessary to arrange the heavy machinery in a direction substantially orthogonal to the above. However, in the stirring device described in this section, as described above, the rod portion is axially rotated by the shaft rotation mechanism, so that the flat end of the construction range is located in the front direction of the heavy machine or in the opposite front direction. Not only the part but also the flat end part located in the side direction of the heavy machine can be constructed. As a result, flat ends located in various directions of the construction range are constructed without moving the heavy machinery, so that the frequency of movement of the heavy machinery is also suppressed and the work efficiency is further improved. It will be. Furthermore, in addition to the timing of constructing the flat end of the construction range, for example, when the ground is agitated at the timing of finishing the construction, the shaft rotation mechanism alternately shafts the rod portion counterclockwise and clockwise. It may be rotated and rocked. By doing so, as compared with the case where the rod portion is not swung, the range of stirring when the tip of the rod portion is moved in the same trajectory is widened, so that the construction efficiency is improved.

(3) In the above item (2), a rotary drive unit for rotating the pair of stirring blades by utilizing the power supplied from the heavy machine is separately provided at the tip of the rod portion for each stirring blade. Each of the rotation drive units is provided with a rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade, and when the rod portion is axially rotated by the shaft rotation mechanism, the rotation control mechanism is provided. A stirring device (claim 3) including a rotation assisting control unit that controls each of the rotation control mechanisms so as to rotate the pair of stirring blades in a direction that assists shaft rotation (claim 3).

The stirring device described in this section is provided with a rotary drive unit for rotating a pair of stirring blades by power supplied from a heavy machine at the tip of the rod portion separately for each stirring blade, and further, each rotary drive unit is provided. The unit is provided with a rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade. As a result, for example, when the pair of stirring blades are rotated in the same direction, the stirring blades may advance in an unintended direction due to the force resisting the rotation, and insufficient stirring may occur everywhere. By rotating the blades in opposite directions, the force resisting the rotation of the stirring blades is canceled and the traveling direction of the stirring blades is stabilized, so that the occurrence of insufficient stirring is suppressed. Further, even if the stirring blade advances in an unintended direction, the direction can be easily corrected by rotating the stirring blade in the opposite direction to the previous direction, so that the loss of construction time can be reduced. Further, since the tip load with respect to the pushing force to the ground is controlled by controlling the rotational torque and the like, the occurrence of hole bending and the resulting insufficient stirring can be suppressed.

In addition, in the stirring device described in this section, when the rod portion is rotated by the shaft rotation mechanism, each of the rotation control mechanisms is rotated so as to rotate the pair of stirring blades in the direction assisting the shaft rotation. It includes a rotation assist control unit to control. Here, the rotation directions of the pair of stirring blades controlled by the rotation assist control unit are usually opposite to each other. As a result, in particular, when the rod portion is rotated so as to swing as described in the above item (2), the rotation directions of the pair of stirring blades are switched according to the direction of the shaft rotation. As a result, the shaft rotation of the rod portion and the switching of the shaft rotation direction can be smoothly performed, and the work efficiency is improved.

(4) In the above items (1) to (3), the pipe for supplying the improved material and / or the air is provided in the vicinity of the pair of stirring blades along at least a part of the rod portion. A stirring device (claim 4) in which one or two agitators are detachably attached to the outside of the portion and the position of the discharge port of the pipe can be adjusted.
In the stirring device described in this section, a pipe for supplying an improving material for ground improvement and / or air (air) in the vicinity of the pair of stirring blades is provided outside the rod portion along at least a part of the rod portion. One or two can be attached to and detachably from the above. At this time, each pipe may supply only the improved material, may supply only the air, or may supply the improved material and the air at the same time. When two pipes are attached, any two supply patterns may be selected from the above three supply patterns, including a combination of the same supply patterns. Further, the supply pattern of each pipe may be changed during use.

Here, in many conventional agitators, a pipe for supplying an improved material is installed inside the rod portion, and the pipe is not replaced. Therefore, the pipe installed in advance can be used as an improved material. Only could be supplied. In particular, since conventional pipes are made of steel, they are used exclusively for slurries and powders, making it difficult to supply corrosive materials. On the other hand, in the stirring device described in this section, the improved material and / or the pipe for supplying air is detachably attached to the outside of the rod portion, so that the pipe is replaced as necessary. As a result, pipes having an appropriate material and pipe diameter are selected in advance or replaced with such pipes at the construction site, so that various types of improvement materials such as slurries, powders, and corrosive materials can be used. Will be supplied, and further improvement in work efficiency is expected.

In addition, the stirrer described in this section is capable of adjusting the position of the discharge port from which the improved material and / or air is discharged when the pipe is attached. That is, the position of the discharge port is adjusted to an arbitrary position so as to supply the improving material and / or air to the vicinity of the pair of stirring blades. For example, the pair of stirring is performed in a direction parallel to the extending direction of the rod portion. The position is adjusted to the position on the mounting portion side of the blade, the position on the tip side of the rod portion from the pair of stirring blades, and the like. Such adjustment of the position of the discharge port may be realized by adjusting the length of the pipe, adjusting the direction in which the pipe is extended, or the like. As a result, the improving material and air will be discharged to an appropriate position according to the condition such as the quality of the ground. Furthermore, if the configuration is such that both the improved material and air can be supplied, air will be supplied as needed in addition to the improved material, so not only the ground forming soil and the improved material, but also there. The air is mixed and agitated. As a result, as compared with the case where the air is not agitated, the weight of the improved body to be formed becomes lighter and the internal pressure becomes smaller, so that the agitation efficiency is improved and the mud is drained smoothly. In a configuration that can supply only air, for example, when pulling out or rotating the stirring device, if nothing is supplied from the piping, a vacuum state may occur. To avoid this, air is supplied from the piping. It is used when supplying.

(5) In the above items (1) to (4), a spiral tube having a straight tubular shape in which a guide plate is spirally provided on the outer circumference and capable of axial rotation by utilizing the power supplied from the heavy machine is a spiral tube. A stirring device (claim 4) attached along at least a part of the rod portion in a manner in which the tip thereof is directed toward the upper side of the pair of stirring blades.
The stirring device described in this section further includes a spiral tube, which has a straight tubular shape having a spiral guide plate on the outer circumference, and can rotate around the axis by using the power supplied from a heavy machine. It is a thing. Such a spiral tube is attached along at least a portion of the rod portion with its tip directed toward the upper vicinity of the pair of stirring blades.

Here, when mixing and stirring in the ground while supplying the improved material such as cement slurry, the mixture (mixture of the ground forming soil and the improved material) or the like corresponding to a part of the volume of the supplied improved material is Although it is discharged to the ground surface, there is a risk that the pressure due to the influence of the remaining volume will push the ground to the side and displace the adjacent structures and the like. Therefore, in the stirring device described in this section, while the ground is mixed and stirred while supplying the improved material, a spiral pipe having the above structure is placed on the side opposite to the tip of the rod portion (ground surface side) by the guide plate. Rotate the axis in the direction of rotation. As a result, the internal pressure increased by the supply of the improved material is smoothly discharged from the upper vicinity of the stirring blade toward the ground surface, so that the lateral displacement of the adjacent structure or the like is suppressed.

(6) In the above items (1) to (5), in the pair of stirring blades, the angle formed between each rotation axis and the extending direction of the rod portion is set toward the tip end side of the rod portion. It is attached in opposite directions with the rod portion sandwiched in a state of being slightly inclined so as to be smaller than 90 °, and as the plurality of cutting blades, directly below the center of the tip of the rod portion in the lateral direction. A stirring device (claim 6) including a removable tip cutting blade for excavating and stirring.
In the stirring device described in this section, a pair of stirring blades are attached to the tips of the rod portions in opposite directions, and at this time, the stirring blades are formed between the respective rotation axes of the stirring blades and the extending direction of the rod portion. It is installed in a slightly inclined state so that the angle of rotation is smaller than 90 ° toward the tip end side of the rod portion. In other words, each of the stirring blades is slightly such that the end opposite to the end attached to the rod portion is located closer to the tip of the rod portion in the direction parallel to the axis of rotation. It can be installed at an angle.

Further, in the stirring device described in this section, each of the pair of stirring blades has a detachable tip cutting blade for excavating and stirring just below the lateral center of the tip of the rod portion as a plurality of cutting blades. Includes. That is, if the stirring blade is not attached at an angle, if a part of the cutting blade is attached so as to excavate just below the lateral center of the tip of the rod, the cutting blade will be the rod when the stirring blade rotates. It could not be used practically because it interfered with the part. Therefore, by including the tip cutting blade as described above after the stirring blade is attached at an angle as described above, the tip cutting blade does not interfere with the rod portion, and the tip of the rod portion which has not been reached in the past is not reached. The tip cutting blade will excavate and stir just below the center of the side direction. As a result, especially when the construction target is hard ground, the area directly under the tip of the rod portion is efficiently excavated and agitated, and the occurrence of insufficient agitation is suppressed.

(7) In the above items (1) to (6), when the pair of stirring blades rotate, two or more stirring blades rotate at different positions in a direction parallel to the rotation axis of the stirring blades. A stirring device including a plurality of protruding portions, which is detachably attached to the rod portion so as to project toward the cutting blade (7).
The stirrer described in this section further includes a plurality of protrusions, which, when the pair of stirring blades are rotated, in each of the stirring blades in a direction parallel to the rotation axis of the stirring blades. It is detachably attached to the rod portion so as to project toward between two or more cutting blades that rotate at different positions. That is, each of the protruding portions is in a state of rotating around the stirring blade through between the cutting blades when viewed relatively from the rotating stirring blade. As a result, it is possible to prevent the ground-forming soil from adhering between the cutting blades, especially when the clay-based ground is agitated. Further, the stirring efficiency of the ground is improved by the synergistic action of the cutting blade and the protruding portion.

(8) In the above items (1) to (7), an extension mechanism for extending the length of the rod portion from the attachment position by the attachment portion to the tip by utilizing the power supplied from the heavy machine. A stirrer with.
The stirring device described in this section further includes an extension mechanism, which extends the length of the rod portion from the attachment position by the attachment portion to the tip by using the power supplied from the heavy machine. Is. Therefore, after excavating and stirring the ground without extending the rod portion, the ground is excavated and agitated again with the rod portion extended by the extension mechanism to move heavy machinery and attach an extension rod. The construction range is expanded without any problem.

(9) In the above (1) to (8), the stirring device in which the heavy machine is a hydraulic excavator (claim 8).
Since the heavy machinery to be installed is a hydraulic excavator, the agitator described in this section is often used in construction mainly for shallow ground, and the hydraulic excavator has a small turning radius. It will be compatible with on-site construction under various conditions.

(10) In the above (1) to (8), the stirring device (claim 9) in which the heavy machine is a hydraulic large-diameter drilling machine with a leader.
In the agitator described in this section, the heavy equipment to be attached is a hydraulic large-diameter drilling machine with a leader, so that the rod length is not selected according to the depth of the ground to be improved and the extension rod is not attached or detached. By using a rod part with a length corresponding to the maximum depth, it can be used for construction at various depths. Further, the leader of the hydraulic large-diameter drilling machine with a leader acts as a guide for the stirring device, and it is expected that the construction accuracy in the vertical direction will be improved.

(11) A mechanical stirring method for improving the ground by using a stirring device attached to a heavy machine working machine and stirring the ground while supplying an improving material and / or air. The stirring device is a rod portion. And, while rotating using the power supplied from the heavy machine, the ground is agitated by a plurality of cutting blades provided on the outer periphery so that the rotation axis is orthogonal or substantially orthogonal to the extending direction of the rod portion. Includes a pair of stirring blades attached to the tip of the rod portion and a refraction mechanism that uses the power supplied from the heavy machine to bend the rod portion from the middle portion to the tip of the heavy machine. The stirring device is attached to the working machine so that the pair of stirring blades are located on the left side and the right side of the heavy machine while the tip of the rod portion faces downward in the front, and obstacles are formed in the ground. In a certain case, the ground is agitated while avoiding the obstacles in a state where the rod portion is bent from the middle portion to the tip portion toward the heavy machine side with respect to the extending direction of the rod portion by the bending mechanism. A mechanical agitation method (claim 10).

(12) In the above item (11), the stirring device utilizes the power supplied from the heavy machine, and the rod portion has a rotation axis parallel to the extending direction in the non-refractive state of the rod portion. The shaft includes a shaft rotation mechanism for rotating the portion counterclockwise and clockwise by at least 90 °, respectively, and at least when constructing an end portion of the construction range located in the lateral direction of the heavy machine. A mechanical agitation method (claim 11) in which the ground is agitated while the rod portion is axially rotated by a rotation mechanism.
(13) In the above item (12), the stirring device uses the power supplied from the heavy machine to provide a rotation driving unit for rotating the pair of stirring blades to the tip of the rod portion. Each of the rotation drive units is provided separately, and each of the rotation drive units is provided with a rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade, and the rod portion is provided by the shaft rotation mechanism. A mechanical stirring method (claim 12) in which each of the rotation control mechanisms is controlled so as to rotate the pair of stirring blades in a direction assisting the shaft rotation when the shaft is rotated.
The mechanical stirring method according to the items (11) to (13) is executed by using the stirring device according to the above items (1) to (3), respectively, thereby stirring the items (1) to (3). It has the same effect as the device.

(14) In the above item (12), the stirring device uses the power supplied from the heavy machine to provide a rotation driving unit for rotating the pair of stirring blades to the tip of the rod portion. Each of the rotation drive units is provided with a rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade, and the rod portion is bent by the refraction mechanism. While the rod portion is alternately rotated counterclockwise and clockwise by the shaft rotation mechanism to swing in the state of being rotated or not bent, and the rotation control mechanism is used to rotate each of the pair of stirring blades. A mechanical agitation method (claim 13) that agitates the ground while changing the direction of rotation and the number of rotations.

The mechanical stirring method described in this section combines the operation control of the rod portion by the refraction mechanism and the shaft rotation mechanism provided in the stirring device and the control of the stirring blade by the rotation control mechanism to stir the ground. Specifically, the rod portion is alternately rotated counterclockwise and clockwise by the shaft rotation mechanism in a state where the rod portion is bent or not bent by the bending mechanism, for example, 180 ° (counterclockwise 90 ° +). The ground is agitated while swinging clockwise (90 ° clockwise) and changing the rotation direction and the number of rotations of each of the stirring blades by the rotation control mechanism. At this time, the presence or absence of refraction of the rod portion, the magnitude of the refraction angle, the magnitude of the swing rotation angle of the rod portion, the rotation direction and the rotation speed of the stirring blade are determined according to the construction conditions such as the ground condition and the stirring position. It is set arbitrarily. As a result, it is not necessary to change the position of the heavy machine, and the range of the ground to be agitated is increased, so that the work efficiency is further improved.

(15) In the above items (11) to (14), a pipe for supplying the improved material and / or air to the vicinity of the pair of stirring blades is provided along at least a part of the rod portion. A mechanical agitation method in which one or two pipes are attached to the outside of the pipe so that it can be attached and detached and the position of the discharge port of the pipe can be adjusted.
(16) In the above items (11) to (15), a spiral tube having a straight tubular shape in which a guide plate is spirally provided on the outer periphery thereof and capable of axial rotation by utilizing the power supplied from the heavy machine is provided. Attached along at least a part of the rod portion so that the tip thereof faces the upper vicinity of the pair of stirring blades, and while supplying the improved material, the guide plate moves toward the side opposite to the tip of the rod portion. A mechanical agitation method in which the ground is agitated while the spiral pipe is axially rotated in the direction of rotation.

(17) In the above items (11) to (16), the angle formed by the pair of stirring blades of the stirring device between the respective rotation axes and the extending direction of the rod portion is the rod portion. In a state of being slightly inclined so as to be smaller than 90 ° toward the tip end side, the rod portions are attached in opposite directions with the rod portion interposed therebetween, and the pair of stirring blades are attached to each of the pair of stirring blades as the plurality of cutting blades. A mechanical stirring method in which a tip cutting blade for excavating and stirring just below the center of the tip of the rod portion in the lateral direction is detachably attached.
(18) In the above items (11) to (17), when the pair of stirring blades rotate, two or more stirring blades rotate at different positions in a direction parallel to the rotation axis of the stirring blades. A mechanical agitation method in which a plurality of projecting portions are detachably attached to the rod portion so as to project toward between the cutting blades.
Then, the mechanical stirring method according to the items (15) to (18) is executed by using the stirring device according to the above items (4) to (7), respectively, so that the above items (4) to (7) can be executed. It has the same effect as that of the stirrer.

Since the present invention has the above-described configuration, it is possible to suppress the frequency of movement of heavy machinery in the mechanical stirring method, and it is possible to improve work efficiency.

It is a front view of the stirring apparatus which concerns on 1st Embodiment of this invention. It is a side view of the stirring device of FIG. 1, (a) shows a state in which a rod part is not refracted, and (b) shows a state in which a rod part is bent. It is the schematic which shows an example of the piping which the position of a discharge port is different from FIG. It is a construction image figure by the hydraulic excavator provided with the stirring device which concerns on 1st Embodiment of this invention. It is a block diagram which shows typically the hydraulic pressure control image of the hydraulic excavator provided with the stirring device which concerns on 1st Embodiment of this invention. It is a side view which shows the hydraulic large-diameter drilling machine with a leader provided with the stirring device which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. Here, detailed description of the same part or the corresponding part as in the prior art will be omitted, and the same part or the corresponding part will be indicated by the same reference numerals throughout the drawings.
1 and 2 schematically show the configuration of the stirring device 10 according to the first embodiment of the present invention. As shown in the figure, the stirring device 10 according to the first embodiment of the present invention includes a rod portion 12, a pair of stirring blades 14 (14A, 14B), a mounting portion 30, a pipe 32, an air pipe 33, and a plurality of protrusions. A portion 34, a bending mechanism 40, a shaft rotation mechanism 46, a spiral tube 52, and an extension mechanism 58 are included. The rod portion 12 constitutes the main body portion of the stirring device 10, has a hollow substantially straight tubular shape, and various members are attached to the outside and the inside thereof.

The pair of stirring blades 14 are attached to the tips of the rod portions 12, and in the example of FIG. 1, one stirring blade 14A is located on the left side in the drawing and the other stirring blade 14B is located on the right side in the drawing. The rod portion 12 is attached in opposite directions with the tip portion 12a interposed therebetween. Each of the pair of stirring blades 14A and 14B is provided with a plurality of cutting blades 16 on the outer periphery thereof, and is rotated by a rotation driving unit 20 described later. Further, in the pair of stirring blades 14A and 14B, the tip portion 12a of the rod portion 12 so that the respective rotation axes 18 are orthogonal or substantially orthogonal to the extending direction of the rod portion 12 (vertical direction in FIGS. 1 and 2). It is attached to. In the example of FIG. 1, the angle α formed between each rotation shaft 18 and the extending direction of the rod portion 12 is smaller than 90 ° toward the tip end side (lower side in the figure) of the rod portion 12. It is in a slightly inclined state so as to be. For example, the angle α formed between the rotating shaft 18 and the extending direction of the rod portion 12 is not limited to this, but is smaller than 90 ° by about 5 °.

The plurality of cutting blades 16 provided on each of the pair of stirring blades 14A and 14B include a plurality of tip cutting blades 17. These tip cutting blades 17 are for excavating and stirring just below the center of the tip portion 12a of the rod portion 12 in the lateral direction (horizontal direction in FIG. 1), and as can be confirmed in FIG. 1, each stirring It is provided at a position closest to the tip portion 12a among the plurality of cutting blades 16 in a direction parallel to the rotation axis 18 of the blade 14. Further, the tip cutting blade 17 does not interfere with the rod portion 12 when it is in the upper position in FIG. 1 due to the rotation of the stirring blade 14, and is different when it is in the lower position in FIG. The tip cutting blades 17 provided in the 14 are provided at an appropriate angle and length so as not to interfere with each other. Further, these tip cutting blades 17 are detachably attached to each of the stirring blades 14, and are attached and detached as needed. In FIG. 1, the tip cutting blade 17 is included, and the shape of the cutting blade 16 is simplified and shown.

The rotary drive unit 20 described above is separately provided for each pair of stirring blades 14 so as to be built into the stirring blade 14 at the tip of the rod portion 12. In this embodiment, one stirring blade 14A is provided. It is composed of a hydraulic motor 20A for a first stirring blade to rotate and a hydraulic motor 20B for a second stirring blade to rotate the other stirring blade 14B. The hydraulic motor 20A for the first stirring blade and the hydraulic motor 20B for the second stirring blade utilize the power (hydraulic pressure in this embodiment) supplied from the heavy machine 70 (see FIG. 4) to form a pair of stirring blades 14A and 14B. Is rotated, and hydraulic pressure is supplied through the inside of the rod portion 12. Further, the hydraulic motor 20A for the first stirring blade and the hydraulic motor 20B for the second stirring blade are each provided with a rotation control mechanism 22, and the rotation control mechanism 22 provides a rotation direction and a rotation speed of each stirring blade 14. And the rotational torque etc. are controlled.

Further, in the examples of FIGS. 1 and 2, each of the rotation drive units 20 is provided with a rotation assist control unit 62. These rotation assist control units 62 rotate the rotation control mechanism 22 so as to rotate the pair of stirring blades 14 in the direction assisting the shaft rotation when the rod portion 12 is axially rotated by the shaft rotation mechanism 46 described later. It controls each of the above. The specific content of this control will be described later together with the shaft rotation mechanism 46. The rotation assist control unit 62 may be installed at any position as long as the rotation control mechanism 22 can be controlled. For example, the rotation assist control unit 62 may be installed inside the rod unit 12 or installed in the heavy machine 70. You may.
With the above-described configuration, the pair of stirring blades 14 are rotated by the hydraulic motors 20A and 20B (rotational drive unit 20) controlled by the rotation control mechanism 22 during construction using the stirring device 10, and the stirring blades 14 are rotated. The ground G (see FIG. 4) is agitated by the plurality of cutting blades 16 that rotate and move along the outer circumference. In FIG. 2, the plurality of cutting blades 16 that are rotating and moving are simply shown in a circular shape.

With reference to FIG. 1, when the pair of stirring blades 14 rotate, the plurality of protruding portions 34 rotate at different positions in each stirring blade 14 in a direction parallel to the rotation axis 18 of the stirring blade 14. It is attached to the rod portion 12 so as to project toward between one or more cutting blades 16. In the example of FIG. 1, when first confirmed from one of the stirring blades 14A, among the four cutting blades 16 shown on the upper side in the figure of the outer circumference of the stirring blade 14A, between the three cutting blades 16 adjacent to each other on the left side in the drawing. Two projecting portions 34 are fixed to the rod portion 12 via the support member 36 so as to project toward each of the two projecting portions 34. Similarly, when the other stirring blade 14B is confirmed, among the four cutting blades 16 shown on the upper side of the outer circumference of the stirring blade 14B in the figure, each of the three cutting blades 16 adjacent to the right side in the drawing Two projecting portions 34 are fixed to the rod portion 12 via the support member 36 so as to project toward the rod portion 34. These protrusions 34 may be, for example, rod-shaped or plate-shaped, and the material thereof may be one having high rigidity or one that bends to some extent, for example, a steel wire or the like. Further, the plurality of projecting portions 34 are detachably attached to the support member 36 or to the rod portion 12 together with the support member 36, and are attached and detached as necessary. .. In FIG. 2, the plurality of projecting portions 34 and the support member 36 are not shown.

With reference to FIG. 2, the pipe 32 is for supplying an improvement material for ground improvement in the vicinity of the pair of stirring blades 14A and 14B, and in this embodiment, the front and rear outside the rod portion 12 It is attached to the rear side in the direction (right side in FIG. 2). Further, the pipe 32 is detachably attached to the rod portion 12 along a part of the rod portion 12. Although not shown in FIG. 2 for convenience, any method can be adopted as the method of attaching the pipe 32 as long as it can be attached to and detached from the rod portion 12. Further, in FIG. 2, only a part of the pipe 32 along the rod portion 12 up to one end (lower end in the drawing) serving as the discharge port 32a of the improved material is shown, and is actually shown. The other end of the pipe 32 extends to the supply source of the improved material installed in the heavy machine 70 or its vicinity.

Here, in the pipe 32, the position of the discharge port 32a for discharging the improved material can be adjusted. For example, in FIG. 3, the position of the discharge port 32a is adjusted to a position different from that in FIG. Is illustrated. In FIG. 3, the stirring blade 14 is not shown, and the rod portion 12 is shown in a simplified manner. The length of the pipe 32 shown in FIG. 3 is extended along the tip portion 12a of the rod portion 12 with the portion that was the discharge port 32a in the example of FIG. 2 as the connecting portion 32b, and the discharge port 32a is the tip portion. It is located on the lower side in the figure of 12a. Further, a part of the pipe 32 is covered with, for example, a steel cover 38. The position of the pipe 32 is arbitrary as long as it is attached along a part of the rod portion 12, and the rod portion 12 is located on the side side (left side or right side in FIG. 1) or the front side (FIGS. 2 and 3). It may be attached to the left side). Further, a part of the pipe 32 may be made of a flexible material in order to cope with the refraction of the rod portion 12 by the refraction mechanism 40 described later.

Returning to FIG. 2, the air pipe 33 is for supplying air (air) in the vicinity of the pair of stirring blades 14A and 14B, and in the example of FIG. 2, parallel to the pipe 32 and outside the rod portion 12. It is attached to the right side in FIG. Similar to the pipe 32, the air pipe 33 is detachably attached to the rod portion 12 along a part of the rod portion 12, and the attachment method is such that the air pipe 33 is detachable to the rod portion 12. If so, any method can be adopted. Further, in FIG. 2, only a part of the air pipe 33 along the rod portion 12 up to one end (lower end in the drawing) serving as the air discharge port 33a is shown, and is actually shown. The other end of the air pipe 33 extends to the air supply source installed in the heavy equipment 70 or its vicinity. Further, in the air pipe 33, the position of the discharge port 33a can be adjusted in this respect as well as the pipe 32, and the position of the discharge port 33a is set according to the situation.

The position of the air pipe 33 as described above is arbitrary as long as it is attached along a part of the rod portion 12, and is on the side side (left side or right side in FIG. 1) or the front side (FIG. 2) of the rod portion 12. It may be attached to the left side). Further, in order to cope with the refraction of the rod portion 12 by the refraction mechanism 40 described later, a part of the air pipe 33 may be formed of a flexible material.
The stirring device 10 of the present embodiment has a configuration in which a pipe 32 for supplying the improved material and an air pipe 33 for supplying air are provided one by one, but the stirring device 10 is configured to include one of them. Alternatively, the configuration may include two pipes 32 or two air pipes 33. Further, the structure may be provided with a pipe for merging the improved material and the air and supplying the air at the same time, or two such pipes may be provided. Alternatively, the configuration may be such that a pipe that simultaneously supplies the improved material and air and one of the pipe 32 or the pipe 33 are provided at the same time.

Returning to FIGS. 1 and 2, the spiral tube 52 has a straight tubular shape in which a guide plate 54 is spirally provided on the outer circumference, and the lower tip in FIGS. 1 and 2 has a pair of stirring blades 14A. In this embodiment, the rod portion 12 is attached to the front side (left side in FIG. 2) along the rod portion 12 so as to reach the upper vicinity in the figure of 14B. Further, the spiral pipe 52 is adapted to rotate around the shaft by using the power supplied from the heavy machine 70 (hydraulic pressure in this embodiment), and in this embodiment, the spiral pipe 52 holds the upper end side in the drawing. The shaft is rotated by the hydraulic spiral pipe shaft rotation motor 56 installed as described above. The method of axially rotating the spiral tube 52 and the method of attaching the spiral tube 52 to the rod portion 12 so as to be axially rotatable are not limited to this embodiment, and may be another method.

The refraction mechanism 40 uses the power supplied from the heavy machine 70 (hydraulic pressure in this embodiment) to refract the rod portion 12 from the middle portion to the tip end. In this embodiment, as shown in FIG. 2A, the refraction mechanism 40 is above the rod refraction cylinder 42 installed inside the rod portion 12 and the middle portion of the rod portion 12 in the drawing. Includes a pin 44 that pin-connects the portion of and the portion below. In the state of FIG. 2A, the rod refraction cylinder 42 is extended and the rod portion 12 is straightened. On the other hand, in FIG. 2B, due to the degeneracy of the rod refraction cylinder 42, the rod portion 12 from the pin connection portion to the tip slightly rotates about the pin 44, and the rod portion 12 It shows a state of being refracted to the right side in the figure with respect to the extending direction (vertical direction in the figure). In FIG. 2B, the rod refraction cylinder 42 and the pin 44 are not shown for convenience. Further, the refraction mechanism 40 is not limited to the configuration including the rod refraction cylinder 42 and the pin 44, and may have another configuration.

The shaft rotation mechanism 46 uses the power supplied from the heavy machine 70 (hydraulic pressure in this embodiment) to rotate a shaft parallel to the extending direction (vertical direction in the figure) of the rod portion 12 in the non-refractive state. As a result, the rod portion 12 is axially rotated in a counterclockwise direction and a clockwise direction, respectively. In this embodiment, as shown in FIG. 1, the shaft rotation mechanism 46 is a rod rotation first cylinder 48 and a rod rotation second cylinder arranged on both sides of the rod portion 12 in the lateral direction (left-right direction in the drawing). Includes 50 and. The rod rotation first cylinder 48 and the rod rotation second cylinder 50 combine the expansion and contraction movements of the rod portion 12 and the attachment portion 30 so as to rotate the rod portion 12 with respect to the attachment portion 30. It is connected to both.

1 and 2 show a reference state in which the rod portion 12 is not axially rotated. From this state, the combination of expansion and contraction operations of the rod rotation first cylinder 48 and the rod rotation second cylinder 50 is performed. In this embodiment, the rod portion 12 is axially rotated by a maximum of 90 ° in each of the counterclockwise rotation and the clockwise rotation. The maximum rotation angle of the rod portion 12 by the shaft rotation mechanism 46 is not limited to 90 °, and may be larger or smaller than 90 °. Further, the shaft rotation mechanism 46 is not limited to the configuration including the rod rotation first cylinder 48 and the rod rotation second cylinder 50, and may have other configurations.

Here, a method of assisting the shaft rotation of the rod portion 12 by the rotation assisting control unit 62 will be described. As described above, the rotation assisting control unit 62 controls the rotation so that when the rod portion 12 is rotated by the shaft rotation mechanism 46, the pair of stirring blades 14 are rotated in the direction assisting the shaft rotation. It controls the mechanism 22. For example, when the rod portion 12 is axially rotated clockwise in a plan view by the shaft rotation mechanism 46, one of the stirring blades 14A of the rotation assisting control unit 62 rotates counterclockwise when viewed from the left side in FIG. Each of the rotation control mechanisms 22 is controlled so that the stirring blade 14B of the above rotates counterclockwise when viewed from the right side in FIG. Further, when the rod portion 12 is axially rotated counterclockwise in a plan view by the shaft rotation mechanism 46, one of the stirring blades 14A of the rotation assisting control unit 62 rotates clockwise when viewed from the left side in FIG. Each of the rotation control mechanisms 22 is controlled so that the stirring blade 14B of the above rotates clockwise when viewed from the right side in FIG. In any of these cases, the pair of stirring blades 14A and 14B will be rotated in opposite directions when viewed from the same direction. The rotation auxiliary control unit 62 may not be provided. In this case, the operator room 74 of the heavy machine 70 (see FIG. 4) when the rod unit 12 is rotated by the shaft rotation mechanism 46. Each of the rotation control mechanisms 22 may be controlled so as to rotate the pair of stirring blades 14A and 14B in the above-mentioned directions that assist the axial rotation of the rod portion 12 by the operation from.

The extension mechanism 58 extends the length of the rod portion 12 by using the power supplied from the heavy machine 70 (hydraulic pressure in this embodiment), and in this embodiment, the front side of the attachment portion 30 (FIG. The rod extension cylinder 60 arranged on the left side in 2) is included. The rod extension cylinder 60 is connected to both the rod portion 12 and the attachment portion 30 so as to extend the length of the rod portion 12 from the attachment portion 30 to the tip by its degenerate operation. 1 and 2 show a standard state in which the rod extension cylinder 60 is extended and the rod portion 12 is not extended. When the rod extension cylinder 60 is degenerated from this state, the length of the rod extension cylinder 60 is reduced. The rod portion 12 is extended by the amount. The configuration of the extension mechanism 58 is not limited to the configuration of this embodiment, and may be another configuration.

On the other hand, the mounting portion 30 is for mounting the rod portion 12 having the above configuration to the working machine 72 of the hydraulic excavator 70A as the heavy machine 70 in the present embodiment, as shown in FIG. .. More specifically, in the mounting portion 30, the tip of the rod portion 12 faces downward in front of the hydraulic excavator 70A (left side in the drawing), and the pair of stirring blades 14A and 14B are on the left side in the lateral direction of the hydraulic excavator 70A and The rod portion 12 is attached to the working machine 72 so as to be located on the right side (the back side and the front side in the direction orthogonal to the paper surface). Further, the mounting portion 30 supports the rod portion 12 so as to be rotatable by the shaft rotating mechanism 46 and stretchable by the extending mechanism 58, with reference to FIGS. 1 and 2.

With reference to FIGS. 1 to 4, the stirring device 10 according to the first embodiment of the present invention having the above-described configuration is described below in a state of being attached to the hydraulic excavator 70A as shown in FIG. It works like. That is, the ground G is excavated by the pair of stirring blades 14A and 14B rotated by the rotary drive unit 20, the improved material supplied from the pipe 32, the air supplied from the air pipe 33, and the ground G. The forming soil is mixed and stirred. At this time, the positions of excavation and stirring by the pair of stirring blades 14A and 14B are controlled by the operation of the working machine 72 of the hydraulic excavator 70A, and the rotation direction, rotation speed, rotation torque and the like of the pair of stirring blades 14A and 14B are controlled. , Controlled by the rotation control mechanism 22. Further, along with the supply of the improved material from the pipe 32, the spiral pipe 52 is rotated by the spiral pipe shaft rotation motor 56 in the direction in which the guide plate 54 provided on the outer periphery of the spiral pipe 52 rotates upward in the drawing. Will be done.

Further, if necessary, the refraction mechanism 40 refracts the rod portion 12 toward the hydraulic excavator 70A, the shaft rotation mechanism 46 rotates the rod portion 12, and / or the extension mechanism 58 extends the rod portion 12. Be told. At this time, the refraction angle of the rod portion 12, the axial rotation angle of the rod portion 12, and the extension length of the rod portion 12 are set to arbitrary angles or lengths up to their respective maximum amounts. In addition, as the improving material used at the time of construction, an appropriate improving material according to the construction conditions is selected from a slurry such as a cement slurry, a powder such as cement, and a corrosive material. Further, from a plurality of pipes 32 having various materials and pipe diameters, a pipe 32 formed of a material suitable for supplying the selected improved material and having a pipe diameter suitable for the construction conditions is selected. It is used by being attached to the rod portion 12.

Here, the hydraulic motor 20A for the first stirring blade and the hydraulic motor 20B for the second stirring blade constituting the rotation drive unit 20, the rod refracting cylinder 42 constituting the refracting mechanism 40, and the rod rotation forming the shaft rotation mechanism 46 are used. As described above, the first cylinder 48, the second cylinder for rotating the rod 50, the cylinder for extending the rod 60 constituting the extension mechanism 58, and the motor 56 for rotating the spiral pipe shaft are all supplied from the heavy machine 70. It is driven by hydraulic pressure. FIG. 5 schematically shows a hydraulic control image of a hydraulic excavator 70A as a heavy machine 70 including a stirring device 10. As shown in the figure, the hydraulic excavator 70A has a hydraulic pressure switching control unit 80, and the hydraulic pressure switching control unit 80 controls the supply destination and the supply amount of the hydraulic pressure.

The hydraulic pressure is supplied to the above-mentioned hydraulic motor 20A for the first stirring blade, the hydraulic motor 20B for the second stirring blade, the cylinder for bending the rod 42, the first cylinder for rotating the rod 48, the second cylinder for rotating the rod 50, and the rod. In addition to the extension cylinder 60 and the spiral pipe shaft rotation motor 56, the hydraulic excavator drive system 82 is included. The hydraulic excavator drive system 82 indicates a drive portion originally provided in the heavy machine 70, and includes each hydraulic actuator for performing the operation of the work machine 72, the rotation of the crawler, the turning operation, and the like. The hydraulic pressure switching control unit 80 is controlled by receiving an operation from the operator room 74 (see FIG. 4) of the heavy machine 70, includes the operation of each drive portion included in the hydraulic excavator drive system 82, extends the rod unit 12, and shafts. All operations of rotation, refraction, rotation of the pair of stirring blades 14, and shaft rotation of the spiral tube 52 will be performed from the operator room 74.

By the way, according to the first embodiment of the present invention having the above configuration, it is possible to obtain the following actions and effects. That is, as shown in FIGS. 1 and 2, the stirring device 10 according to the first embodiment of the present invention includes a rod portion 12 and a pair of stirring blades 14 (14A) attached to the tip of the rod portion 12. , 14B) and a mounting portion 30 for mounting the rod portion 12 to the working machine 72 (see FIG. 4) of the heavy machine 70. Each of the pair of stirring blades 14A and 14B is rotated by the power supplied from the heavy machine 70, and while rotating, the ground G (see FIG. 4) is stirred by a plurality of cutting blades 16 provided on the outer periphery.

Further, the pair of stirring blades 14A and 14B are attached to the tip of the rod portion 12 so that the respective rotation axes 18 are orthogonal to or substantially orthogonal to the extending direction of the rod portion 12. As a result, the plurality of cutting blades 16 that rotate and move along the outer circumference of the stirring blade 14 are directed in the direction in which the tip of the rod portion 12 faces. Further, as can be confirmed in FIG. 4, the rod portion 12 has the tip of the rod portion 12 facing downward in front of the heavy machine 70, and the pair of stirring blades 14 are located on the left and right sides of the heavy machine 70 in the lateral direction. As described above, it is attached to the work machine 72 by the attachment portion 30. Therefore, the plurality of cutting blades 16 of the stirring blade 14 are mainly used downward, and while the ground G is excavated by such a pair of stirring blades 14, the ground forming soil, the improving material, and / or air are used. Is mixed and stirred.

Further, as shown in FIG. 2, the stirring device 10 according to the first embodiment of the present invention includes a refraction mechanism 40 including a rod refraction cylinder 42. The refraction mechanism 40 utilizes the power supplied from the heavy machine 70 to move from the middle part to the tip of the rod part 12 with respect to the extending direction of the rod part 12 as shown in FIG. 2B. It is refracted to the 70 side (right side in FIG. 2). As a result, the tip of the rod portion 12 is directed not only in the extending direction of the rod portion 12 but also in the direction toward the heavy machine 70 in which the rod portion 12 is bent, so that excavation and excavation can be performed without moving the heavy machine 70. The direction of stirring can be switched. In particular, even when an obstacle such as a pipe is present in the ground G, the lower part of the obstacle can be agitated without moving the heavy machine 70 while avoiding the obstacle by the bent rod portion 12. Therefore, the frequency of movement of the heavy machine 70 during construction can be suppressed, and the work efficiency can be improved.

Further, as shown in FIGS. 1 and 2, the stirring device 10 according to the first embodiment of the present invention further includes a shaft rotation mechanism including a rod rotation first cylinder 48 and a rod rotation second cylinder 50. It is equipped with 46. The shaft rotation mechanism 46 uses the power supplied from the heavy machine 70 to rotate the rod portion 12 around the axis parallel to the extending direction of the rod portion 12 in the non-refractive state as a rotation axis. .. The shaft rotation of the rod portion 12 by the shaft rotation mechanism 46 is at least 90 ° in each of the counterclockwise rotation and the clockwise rotation, that is, at least 180 ° with respect to the front direction (left direction in FIG. 2) of the working machine 72. It is rotated within the range of.

Here, with reference to FIG. 4, when the ground G is improved by using the stirring device 10, in order to form the end portion of the construction range (improved body) in a plane, the mounting direction of the stirring blade 14 is formed. In consideration of the above, it is usually necessary to arrange the heavy machine 70 in a direction substantially orthogonal to the plane of the improved body. However, in the stirring device 10 according to the first embodiment of the present invention, as described above, the rod portion 12 is axially rotated by the shaft rotation mechanism 46, so that the construction range is the front direction of the heavy machine 70 or the opposite. Not only the flat end located in the front direction (horizontal direction in the figure), but also the flat end located in the side direction of the heavy machine 70 (the direction orthogonal to the paper surface in FIG. 4). be able to. As a result, it is possible to construct flat ends located in various directions of the construction range without moving the heavy machine 70, so that the movement frequency of the heavy machine 70 can also be suppressed, and the work efficiency can be suppressed. Can be further improved. Further, other than the timing of constructing the flat end portion of the construction range, for example, when the ground G is agitated at the timing of finishing the construction, the shaft rotation mechanism 46 turns the rod portion 12 counterclockwise and clockwise. The shaft may be rotated alternately to swing. By doing so, the range of stirring when the tip of the rod portion 12 is moved in the same trajectory is wider than in the case where the rod portion 12 is not swung, so that the construction efficiency can be improved.

Further, as shown in FIG. 1, the stirring device 10 according to the first embodiment of the present invention has a rod of a rotary drive unit 20 for rotating a pair of stirring blades 14 by power supplied from a heavy machine 70. The tip of the stirring blade 14 is separately provided for each stirring blade 14, and each rotation driving unit 20 is provided with a rotation control mechanism 22 capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade 14. is there. As a result, for example, when the pair of stirring blades 14 are rotated in the same direction, the stirring blades 14 may advance in an unintended direction due to the force resisting the rotation, and insufficient stirring may occur everywhere. By rotating the stirring blades 14 in opposite directions, the force resisting the rotation of the stirring blades 14 is canceled and the traveling direction of the stirring blades 14 is stabilized, so that the occurrence of insufficient stirring can be suppressed. Further, even if the stirring blade 14 advances in an unintended direction, the direction can be easily corrected by rotating the stirring blade 14 in the opposite direction to the previous direction, so that the loss of construction time can be reduced. Further, since the tip load can be controlled with respect to the pushing force on the ground G by controlling the rotational torque and the like, it is possible to suppress the occurrence of hole bending and insufficient stirring due to the hole bending.

In addition, the stirring device 10 according to the first embodiment of the present invention rotates a pair of stirring blades 14 in a direction assisting the shaft rotation when the rod portion 12 is rotated by the shaft rotation mechanism 46. It includes a rotation assisting control unit 62 that controls each of the rotation control mechanisms 22 so as to be caused. Here, the rotation directions of the pair of stirring blades 14 controlled by the rotation assisting control unit 62 are usually opposite to each other. As a result, in particular, when the rod portion 12 is rotated so as to swing as described above, the rotation direction of the pair of stirring blades 14 is switched according to the direction of the shaft rotation, thereby causing the rod portion 12 to rotate. Since the shaft rotation and the shaft rotation direction can be smoothly switched, the work efficiency can be improved.

Further, in the stirring device 10 according to the first embodiment of the present invention, as shown in FIG. 2, the improved material for ground improvement (or both the improved material and the air) is placed in the vicinity of the pair of stirring blades 14A and 14B. The pipe 32 for supplying air to the rod portion 12 and the air pipe 33 for supplying air to the vicinity of the pair of stirring blades 14A and 14B can be attached to and detached from the outside of the rod portion 12 along at least a part of the rod portion 12. It can be attached. Here, in many conventional agitators, a pipe for supplying an improved material is installed inside the rod portion, and the pipe is not replaced. Therefore, the pipe installed in advance can be used as an improved material. Only could be supplied. In particular, since conventional pipes are made of steel, they are used exclusively for slurries and powders, making it difficult to supply corrosive materials. On the other hand, in the stirring device 10 according to the first embodiment of the present invention, since the pipe 32 for supplying the improved material is detachably attached to the outside of the rod portion 12, the pipe 32 is replaced as needed. It can be performed. As a result, a pipe 32 having an appropriate material and pipe diameter can be selected in advance, or the pipe 32 can be replaced with such a pipe 32 at the construction site, so that various types such as slurry, powder, corrosive material, etc. can be used. It is possible to supply the improved material of the above, and further improvement of work efficiency can be expected.

In addition, in the stirring device 10 according to the first embodiment of the present invention, when the pipe 32 and the air pipe 33 are attached, the positions of the discharge ports 32a and 33a to which the improved material and / or the air are discharged are adjusted. It is possible. That is, the positions of the discharge ports 32a and 33a are adjusted to arbitrary positions so as to supply the improving material and / or air to the vicinity of the pair of stirring blades 14, for example, a direction parallel to the extending direction of the rod portion 12. As shown in FIG. 2, the position on the mounting portion 30 side (upper side in the drawing) with respect to the pair of stirring blades 14, and as shown in FIG. 3, the tip end side (lower in the drawing) of the tip portion 12a of the rod portion 12. It is adjusted to the position of (side). As a result, it becomes possible to discharge the improved material or air to an appropriate position according to the condition such as the quality of the ground G. Furthermore, since it is possible to supply both the improved material and the air, it is possible to supply air in addition to the improved material as needed. Therefore, not only the ground forming soil and the improved material but also air there. Can be mixed and stirred. As a result, the weight of the improved body to be created becomes lighter and the internal pressure becomes smaller than when the air is not agitated, so that the agitation efficiency can be improved and the mud can be smoothly drained. It becomes.

Further, as shown in FIGS. 1 and 2, the stirring device 10 according to the first embodiment of the present invention further includes a spiral tube 52, and the spiral tube 52 has a spiral guide plate 54 on the outer periphery thereof. It has a straight tubular shape, and can be rotated by a spiral pipe shaft rotation motor 56 by utilizing the power supplied from the heavy machine 70. Such a spiral tube 52 is attached along at least a part of the rod portion 12 so that its tip is directed toward the upper vicinity of the pair of stirring blades 14A and 14B. Here, when mixing and stirring in the ground G while supplying the improved material such as cement slurry, a mixture (mixture of the ground forming soil and the improved material) or the like corresponding to a part of the volume of the supplied improved material, etc. Is discharged to the ground surface, but there is a risk that the pressure due to the influence of the remaining volume pushes the ground G sideways, thereby displaces the nearby structures and the like. Therefore, in the stirring device 10 according to the first embodiment of the present invention, while the ground G is mixed and stirred while supplying the improved material, the spiral pipe 52 having the above structure is provided with the guide plate 54 as the rod portion. Axial rotation is performed in the direction of rotation toward the side opposite to the tip of 12 (ground surface side). As a result, the internal pressure increased by the supply of the improved material can be smoothly discharged from the upper vicinity of the stirring blade 14 toward the ground surface, so that it is possible to suppress the lateral displacement of the adjacent structure or the like.

Further, in the stirring device 10 according to the first embodiment of the present invention, a pair of stirring blades 14A and 14B are attached to the tips of the rod portions 12 in opposite directions. At this time, as can be confirmed in FIG. 1, the angle α formed between each rotation shaft 18 of the stirring blade 14 and the extending direction of the rod portion 12 is the tip end side (lower side in the drawing) of the rod portion 12. ), It is installed in a slightly inclined state so that it is smaller than 90 °. In other words, each of the stirring blades 14A and 14B has a rod portion 12 having an end opposite to the end attached to the tip portion 12a of the rod portion 12 in a direction parallel to the rotation shaft 18. It is installed with a slight inclination so that it is located closer to the tip of the. Further, each of the pair of stirring blades 14A and 14B includes, as a plurality of cutting blades 16, a removable tip cutting blade 17 for excavating and stirring just below the lateral center of the tip of the rod portion 12. ..

That is, when the stirring blade 14 is not attached at an angle, if a part of the cutting blades 16 are attached so as to excavate directly under the lateral center of the tip of the rod portion 12, when the stirring blade 14 rotates, the cutting blade 16 is attached. Since the cutting blade 16 interferes with the rod portion 12, it cannot be practically used. Therefore, by including the tip cutting blade 17 as described above after the stirring blade 14 is attached in an inclined manner as described above, the tip cutting blade 17 does not interfere with the rod portion 12 and cannot reach the conventional case. The tip cutting blade 17 can excavate and stir just below the center of the tip of the rod portion 12 in the lateral direction. As a result, even if the construction target is hard ground, the pushing force effectively acts to efficiently excavate and stir the area directly under the tip of the rod portion 12, and it is possible to suppress the occurrence of insufficient stirring. Become.

Further, the stirring device 10 according to the first embodiment of the present invention further includes a plurality of projecting portions 34, and these plurality of projecting portions 34 are used in the stirring blade 14 when the pair of stirring blades 14 rotate. A device that is detachably attached to the rod portion 12 so as to project toward between two or more cutting blades 16 that rotate at different positions in a direction parallel to the rotation axis 18 of the stirring blade 14. Is. That is, each of the projecting portions 34 is in a state of rotating around the stirring blade 14 through the cutting blades 16 when viewed relatively from the rotating stirring blade 14. This makes it possible to prevent the ground forming soil from adhering between the cutting blades 16, especially when the clay ground G is agitated. Further, the stirring efficiency of the ground G can be improved by the synergistic action of the cutting blade 16 and the protruding portion 34.

Further, the stirring device 10 according to the first embodiment of the present invention further includes an extension mechanism 58 having a rod extension cylinder 60, and the extension mechanism 58 utilizes the power supplied from the heavy machine 70. , The length of the rod portion 12 from the attachment position by the attachment portion 30 to the tip is extended. Therefore, as shown in FIG. 4, after excavating and stirring the ground G (see the fine hatched portion in FIG. 4) without extending the rod portion 12, the rod portion 12 is extended again by the extension mechanism 58. By excavating and stirring the ground G (see the rough hatched portion in FIG. 4), the construction range can be expanded without moving the heavy machine 70 or attaching the extension rod.
Moreover, the stirring device 10 according to the first embodiment of the present invention can be widely used in construction mainly targeting shallow ground G because the heavy machine 70 to be attached is a hydraulic excavator 70A. In addition, since the hydraulic excavator 70A has a small turning radius, it can be used for on-site construction under various conditions.

Subsequently, FIG. 6 shows the stirring device 10 ′ according to the second embodiment of the present invention. It should be noted that the stirring device 10'according to the second embodiment of the present invention will be described only in the difference from the stirring device 10 according to the first embodiment of the present invention. The description of the configuration and the effect of the same portion as that of the stirring device 10 according to the embodiment will be omitted.
As shown in the figure, the stirring device 10'according to the second embodiment of the present invention is used by being mounted on a hydraulic large-diameter drilling machine 70B with a leader as a heavy machine 70. At this time, the stirring device 10'is attached so as to move in the vertical direction along the leader 76 of the working machine 72 of the hydraulic large-diameter drilling machine 70B with a leader. Further, although detailed description will be omitted, the stirring device 10'is similar to the stirring device 10 according to the first embodiment of the present invention, that is, a pair of stirring blades 14 whose rotation is individually controlled, a detachable and discharge port 32a. The position of the pipe 32 is adjustable, the air pipe 33 is removable and the position of the discharge port 33a is adjustable, the plurality of protrusions 34, the bending mechanism 40 for bending the rod portion 12, and the rod portion 12 are axially rotated. A shaft rotation mechanism 46 for this purpose, a spiral pipe 52 capable of rotating a shaft, and the like are provided. The rod portion 12 preferably has a length corresponding to the maximum depth of the construction range.

As described above, in the stirring device 10'according to the second embodiment of the present invention, the heavy machine 70 to be attached is a hydraulic large-diameter drilling machine 70B with a leader, so that it depends on the depth of the ground to be improved. It is possible to support construction at various depths by using the rod portion 12 having a length corresponding to the maximum depth without selecting the rod length or attaching / detaching the extension rod. Further, since the leader 76 of the hydraulic large-diameter drilling machine 70B with a leader acts as a guide for the stirring device 10', improvement in construction accuracy in the vertical direction can be expected.
On the other hand, the mechanical stirring method according to the embodiment of the present invention is executed by using the stirring devices 10 and 10'according to the first and second embodiments of the present invention as described above. It is possible to achieve the same effect corresponding to 10 and 10'.

In particular, in the mechanical stirring method according to the embodiment of the present invention, the operation control of the rod portion 12 by the refraction mechanism 40 and the shaft rotation mechanism 46 provided in the stirring devices 10 and 10'and the control of the stirring blade 14 by the rotation control mechanism 22 The ground G can be agitated by various methods in combination with. Specifically, for example, in a state where the rod portion 12 is bent or not bent by the refracting mechanism 40, the rod portion 12 is alternately rotated counterclockwise and clockwise by the shaft rotation mechanism 46, for example, 180 °. The ground G is agitated while swinging (counterclockwise 90 ° + clockwise 90 °) and changing the rotation direction and rotation speed of each of the stirring blades 14 by the rotation control mechanism 22. At this time, the presence or absence of refraction of the rod portion 12, the magnitude of the refraction angle, the magnitude of the swing rotation angle of the rod portion 12, the rotation direction and the rotation speed of the stirring blade 14 are determined by the state of the ground G, the stirring position, and the like. It can be set arbitrarily according to the situation. As a result, it is not necessary to change the position of the heavy machine 70, and the range of the ground G to be agitated is increased, so that the work efficiency can be further improved.

10, 10': Stirrer, 12: Rod, 14 (14A, 14B): Pair of stirring blades, 16: Cutting blade, 17: Tip cutting blade, 18: Rotating shaft, 30: Mounting part, 32: Piping, 32a: Discharge port, 33: Air piping, 33a: Discharge port, 34: Protruding part, 40: Refraction mechanism, 46: Shaft rotation mechanism, 52: Spiral tube, 54: Guide plate, 62: Rotation assist control unit, 70: Heavy Machinery, 70A: Hydraulic Excavator, 70B: Hydraulic Large Diameter Drilling Machine with Leader, 72: Working Machine, G: Ground

Claims (13)

A stirrer that is attached to a heavy machine and stirs the ground while supplying improved materials and / or air.
With the rod part
While rotating using the power supplied from the heavy machine, the ground is agitated by a plurality of cutting blades provided on the outer periphery, and the rotation axis is orthogonal to or substantially orthogonal to the extending direction of the rod portion. A pair of stirring blades attached to the tip of the rod,
An attachment portion for attaching the rod portion to the work machine so that the tip of the rod portion faces downward in front of the heavy machine and the pair of stirring blades are located on the left side and the right side in the lateral direction of the heavy machine. And, including
It is characterized by providing a refraction mechanism for refracting the rod portion from the middle portion to the tip portion toward the heavy machine side with respect to the extending direction of the rod portion by utilizing the power supplied from the heavy machine. Stirrer. Utilizing the power supplied from the heavy machine, the rotation axis is the axis parallel to the extending direction of the rod portion in the non-refractive state, and the rod portion is rotated counterclockwise and clockwise at least 90 ° at maximum. The stirring device according to claim 1, further comprising a shaft rotating mechanism for rotating the shaft. A rotary drive unit for rotating the pair of stirring blades by utilizing the power supplied from the heavy machine is separately provided for each stirring blade at the tip of the rod portion, and each of the rotary drive units is provided with a rotation drive unit. A rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade is provided.
Includes a rotation assist control unit that controls each of the rotation control mechanisms so that the pair of stirring blades are rotated in a direction that assists the shaft rotation when the rod portion is axially rotated by the shaft rotation mechanism. The stirring device according to claim 2, wherein the stirring device is characterized by this. A pipe for supplying the improved material and / or the air in the vicinity of the pair of stirring blades can be attached to and detached from the outside of the rod portion along at least a part of the rod portion, and the discharge of the pipe. The stirring device according to any one of claims 1 to 3, wherein one or two outlets are adjustable so that the position of the outlet can be adjusted. A spiral tube having a straight tubular shape with a spiral guide plate on the outer circumference and capable of axial rotation using the power supplied from the heavy machine has its tip directed toward the upper vicinity of the pair of stirring blades. The stirring device according to any one of claims 1 to 4, wherein the stirring device is attached along at least a part of the rod portion. The pair of stirring blades are slightly inclined so that the angle formed between each rotation axis and the extending direction of the rod portion is smaller than 90 ° toward the tip end side of the rod portion. In this state, the rod portions are attached in opposite directions with the rod portion sandwiched between them, and as the plurality of cutting blades, a detachable tip cutting blade for excavating and stirring just below the lateral center of the tip of the rod portion. The stirring device according to any one of claims 1 to 5, wherein the stirring device comprises. When the pair of stirring blades rotate, the stirring blades rotate at different positions in a direction parallel to the rotation axis of the stirring blades so as to project toward between two or more cutting blades. The stirring device according to any one of claims 1 to 6, further comprising a plurality of protruding portions that are detachably attached to the rod portion. The stirring device according to any one of claims 1 to 7, wherein the heavy machine is a hydraulic excavator. The stirring device according to any one of claims 1 to 7, wherein the heavy machine is a hydraulic large-diameter drilling machine with a leader. It is a mechanical stirring method that improves the ground by using a stirring device that is attached to a heavy machine and stirs the ground while supplying improving material and / or air.
The stirring device stirs the ground with a plurality of cutting blades provided on the outer periphery while rotating using the rod portion and the power supplied from the heavy machine, and the rotation axis thereof extends in the extending direction of the rod portion. A pair of stirring blades attached to the tip of the rod portion so as to be orthogonal to or substantially orthogonal to the rod portion, and a refraction mechanism for refracting from the middle portion to the tip of the rod portion by using the power supplied from the heavy machine. , Including
The stirring device is attached to the working machine so that the pair of stirring blades are located on the left side and the right side of the heavy machine while the tip of the rod portion faces downward in front of the heavy machine.
When there is an obstacle in the ground, the obstacle is refracted by the refraction mechanism from the middle portion to the tip of the rod portion toward the heavy machine side with respect to the extending direction of the rod portion. A mechanical stirring method characterized by stirring the ground while avoiding it. The stirring device utilizes the power supplied from the heavy machine to rotate the rod portion counterclockwise and clockwise with an axis parallel to the extending direction of the rod portion in a non-refractive state as a rotation axis. Includes an axis rotation mechanism for at least 90 ° axis rotation
10. The aspect of claim 10, wherein at least when the end portion of the construction range located in the lateral direction of the heavy machine is constructed, the ground is agitated in a state where the rod portion is axially rotated by the shaft rotation mechanism. Mechanical stirring method. The stirring device is provided with a rotation driving unit for rotating the pair of stirring blades by utilizing the power supplied from the heavy machine, separately for each stirring blade at the tip of the rod portion, and the rotation driving unit. Each of the portions is provided with a rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade.
The claim is characterized in that each of the rotation control mechanisms is controlled so as to rotate the pair of stirring blades in a direction assisting the shaft rotation when the rod portion is axially rotated by the shaft rotation mechanism. 11. The mechanical stirring method according to 11. The stirring device is provided with a rotation driving unit for rotating the pair of stirring blades by utilizing the power supplied from the heavy machine, separately for each stirring blade at the tip of the rod portion, and the rotation driving unit. Each of the portions is provided with a rotation control mechanism capable of controlling the rotation direction, rotation speed, and rotation torque of the stirring blade.
The rotation control mechanism while swinging the rod portion by alternately rotating the rod portion counterclockwise and clockwise by the shaft rotation mechanism while the rod portion is bent or not bent by the refraction mechanism. The mechanical stirring method according to claim 11, wherein the ground is stirred while changing the rotation direction and the number of rotations of each of the pair of stirring blades.

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