Mixing device and mechanical mixing method using the same

Abstract

To efficiently agitate a ground formation soil and an improvement material, and improve construction speed.SOLUTION: An agitation device 10 comprises a body part 12 which has an agitation blade 14 for agitating the ground by a plurality of cutting blades 16 and is provided with a discharge port for supplying an improvement material and / or air, and an auxiliary blade 20 which is mounted on the rear end side of the agitation blade 14 of the body part 12 so as to be axially rotatable. The auxiliary blade 20 includes a shaft part 22 and an auxiliary blade 24 provided on the outer periphery of the shaft part 22, and the agitation blade 24 is composed of a plurality of plate blades 26 the plate surfaces of which are inclined in the same direction relative to the rotation direction of the shaft part 22 or one or more spirally installed plate-like members. Thereby, when the agitation device 10 penetrates into the ground, a soil pressure is reduced by removed earth by forward rotation of the auxiliary blade 20, and when the agitation device 10 is extracted from the ground, agitation is promoted by feeding sediment to the agitation blade by reverse rotation of the auxiliary blade 20, so that a ground formation soil and an improvement material are efficiently agitated, and construction speed can be improved.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mixing device that is attached to a heavy machinery working machine and mixes the ground while supplying improvement material and / or air, and a mechanical mixing method using the same. [Background technology]

[0002] When constructing various buildings, if the local ground is weak, ground improvement is carried out. There are various methods for ground improvement, one of which is the mechanical mixing method, in which an improvement material such as a slurried cement-based solidification material is supplied while a mixing blade is rotated by a motor or chain drive, and the mixing blade mixes and mixes the ground-forming soil and the improvement material, creating an improved body underground. Mixing devices equipped with such mixing blades are usually attached to heavy machinery for use (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-277955 Summary of the Invention [Problem to be solved by the invention]

[0004] When excavating with a mixing device, if a large amount of improvement material, such as cement slurry, is discharged into the ground and accumulates in the ground along with the excavated soil and sand, the soil pressure increases, adversely affecting the excavation speed. Also, when the mixed soil mass is pushed up by the discharged cement slurry, etc., some of the soil mass is not fully improved, which requires re-mixing when pulling out or an increased number of blade cuts, which can result in longer construction times. The present invention has been made in view of the above problems, and an object of the present invention is to efficiently mix ground formation soil and improvement materials and improve construction speed. [Means for solving the problem]

[0005] (Aspects of the invention) The following embodiments of the present invention are examples of the configuration of the present invention, and are described in terms to facilitate understanding of the various configurations of the present invention. Each term does not limit the technical scope of the present invention, and while taking into consideration the best mode for carrying out the invention, some of the components of each term may be replaced or deleted, or other components may be added, and these may also be included in the technical scope of the present invention.

[0006] (1) A mixing device that is attached to a heavy machinery working machine and mixes the ground while supplying improvement material and / or air, comprising: a rod-shaped main body with a mixing blade attached to the tip that mixes the ground with a plurality of cutting blades while rotating and a discharge port for supplying improvement material and / or air near the mixing blade; and a long auxiliary blade attached to the rear end of the main body further from the mixing blade and along the extension direction of the main body so as to be rotatable about its axis, the auxiliary blade comprising a shaft and an auxiliary blade provided along the outer periphery of the shaft, the plate surface of which is inclined in the same direction in the vertical and horizontal directions with respect to the rotation direction of the shaft, or a mixing device composed of one or more plate-shaped members arranged in a spiral. Place.

[0007] The mixing device described in this section is attached to a heavy machinery work machine and includes a main body and an auxiliary blade. The main body is rod-shaped, and an mixing blade with multiple cutting blades is attached to its tip. That is, when the rear end of the main body is attached to the heavy machinery work machine, the mixing blade at the tip is rotated, penetrating the ground and excavating the ground with the multiple cutting blades. Furthermore, the main body is provided with a discharge port near the mixing blade for supplying improvement material and / or air, and by excavating the ground while supplying improvement material and / or air from the discharge port, the ground-forming soil and the improvement material and / or air are mixed and mixed.

[0008] The auxiliary blades are long and attached to the main body at a position closer to the rear end than the agitating blades, along the extension direction of the main body, and are attached to the main body so as to be rotatable around the shaft. The auxiliary blades include a shaft and an auxiliary blade attached along the outer periphery of the shaft, and the auxiliary blade is composed of multiple blades or one or more plate-shaped members. Specifically, when the auxiliary blades are composed of multiple blades, the multiple blades are attached to the outer periphery of the shaft with their plate surfaces tilted in the same direction in the vertical and horizontal directions relative to the rotation direction of the shaft. That is, when the multiple blades are viewed from the front facing the outer periphery of the shaft with the extension direction of the shaft being the vertical direction, two blade surfaces are tilted in the same direction, with two blade surfaces facing the upper left and lower right, or two blade surfaces facing the lower left and upper right.

[0009] In contrast, when the aileron is composed of one or more plate-like members, the plate-like member is arranged in a continuous spiral around the outer periphery of the shaft when there is one plate-like member, and in an intermittent spiral when there are two or more plate-like members. That is, even in this case, when viewed from the front from any position facing the outer periphery of the shaft with the extension direction of the shaft being the up-down direction, the one or more plate-like members are uniformly inclined so that two plate surfaces face the upper left and lower right directions, or two plate surfaces face the lower left and upper right directions. As a result, when the aileron rotates around its axis in one direction (forward), an upward force (towards the rear end) is applied to the surroundings by the inclined aileron, and when the aileron rotates around its axis in the other direction (reverse direction), a downward force (towards the tip end) is applied to the surroundings by the inclined aileron.

[0010] Therefore, when the mixing device described in this section penetrates the ground, the ailerons are rotated axially in the forward direction, and the soil and sand located near the tip of the main body excavated by the agitator are discharged toward the ground by the auxiliary blades of the ailerons located at the rear end of the agitator. This reduces the soil pressure in the ground, thereby improving excavation efficiency. Furthermore, when withdrawing from the ground, the ailerons are rotated axially in the reverse direction, forcibly mixing the soil around the ailerons and sending it toward the agitator, where it is mixed by the agitator. This reduces the likelihood of the formation of unimproved soil lumps, resulting in the creation of a dense solidified body. Furthermore, there is no need for remixing or increasing the number of blade cuts, and the ground formation soil and improvement material are efficiently mixed, thereby improving construction speed.

[0011] (2) In the above (1), the shaft portion is a hollow tube, and is configured to discharge the improving agent or air from the tip through the inside of the tube (claim 1 ). The agitator described in this section has a hollow tubular shaft portion of the aileron, and is configured so that, for example, a swivel is installed at the rear end of the shaft to supply improvement material or air, which is then discharged from the tip of the shaft through the inside of the shaft. As a result, improvement material and air are discharged from the aileron shaft portion in addition to being discharged from the main body, so that the ground formation soil and improvement material etc. are mixed more efficiently, and the discharge from the shaft portion toward the agitator blades prevents soil and sand from adhering to the agitator blades.

[0012] (3) In the above (1) and (2), the agitating blades are provided as a pair on either side of the central axis of the main body, and the auxiliary blades are provided as a pair at positions corresponding to the pair of agitating blades when viewed in the axial direction of the main body (claim 2、 3). The mixing device described in this section is provided with a pair of mixing blades and auxiliary blades, the pair of mixing blades being arranged to sandwich the central axis of the main body, and the pair of auxiliary blades being arranged at positions corresponding to the pair of mixing blades when viewed in the axial direction of the main body. That is, when viewed in the axial direction of the main body, the pair of mixing blades are arranged in a positional relationship such that one mixing blade and one auxiliary blade overlap at least partially, and the other mixing blade and the other auxiliary blade overlap at least partially. This allows the pair of mixing blades to perform excavation and mixing in a balanced manner at positions sandwiching the central axis of the main body, and the pair of auxiliary blades to remove soil and send soil and sand to the mixing blades at positions corresponding to each mixing blade. This allows for more efficient excavation of ground formation soil and mixing of ground formation soil with improvement material.

[0013] (4) The above (2) In the above (3), the heavy machinery is a hydraulic excavator or a hydraulic large-diameter drilling machine with a leader (claim 4). The mixing device described in this section is attached to a hydraulic excavator or a leader-equipped hydraulic large-diameter drilling machine. If the heavy equipment is a hydraulic excavator, it is often used for construction work mainly on shallow ground, and because hydraulic excavators are maneuverable, they can be used for construction work on site under various conditions. On the other hand, if the heavy equipment is a leader-equipped hydraulic large-diameter drilling machine, it can be used for construction work at various depths, and the leader of the leader-equipped hydraulic large-diameter drilling machine acts as a guide for the mixing device, which is expected to improve construction accuracy in the vertical direction.

[0014] (5) A mechanical mixing method for improving ground using a mixing device attached to a heavy machinery working machine that mixes the ground while supplying improvement material and / or air, the mixing device comprising: a rod-shaped main body with a mixing blade attached to the tip that mixes the ground with a plurality of cutting blades while rotating, and a discharge port for supplying improvement material and / or air near the mixing blade; and a long auxiliary blade attached to the main body rearward of the mixing blade and along the extension direction of the main body so as to be rotatable about its axis; the auxiliary blade comprises a shaft and an auxiliary blade provided along the outer periphery of the shaft, the auxiliary blade being composed of a plurality of plate blades whose plate surfaces are inclined in the same direction in the vertical and horizontal directions with respect to the rotation direction of the shaft, or one or more plate-shaped members installed in a spiral; when the mixing device penetrates, the auxiliary blade rotates about its axis in a direction that moves surrounding soil and sand upward, and when the mixing device is pulled out, the auxiliary blade rotates about its axis in a direction that moves surrounding soil and sand downward. Law.

[0015] (6) In the above (5), a mechanical mixing method (claim 1) is used in which the shaft portion is hollow and tubular, and the improving material or air is discharged from the tip through the inside of the shaft portion. 5 ). (7) In the above (5) and (6), a pair of the agitating blades is provided on either side of the central axis of the main body, and a pair of the auxiliary blades is provided at positions corresponding to the pair of agitating blades when viewed in the axial direction of the main body (claim 6、 7).

[0016] (8) The above (6) In the item (7), a mechanical mixing method using a hydraulic excavator or a hydraulic large-diameter drilling machine with a leader as the heavy machinery (claim 8). The mechanical mixing methods described in items (5) to (8) are each carried out using the mixing devices described in items (1) to (4) above, and thus achieve the same effects as those of the mixing devices described in items (1) to (4) above. [Effects of the Invention]

[0017] Since the present invention has the above-described configuration, it is possible to efficiently mix the ground formation soil and the improvement material, thereby improving the construction speed. [Brief explanation of the drawings]

[0018] [Figure 1] 1A and 1B are a side view and a front view of a stirring device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a construction image diagram showing the state of penetration into the ground when improving the ground using the mixing device of FIG. 1. [Figure 3] FIG. 2 is a construction image diagram showing the state when the mixing device of FIG. 1 is pulled out from the ground when improving the ground. [Figure 4] FIG. 2 is an image diagram showing a configuration of auxiliary blades of an aileron different from that of the agitator of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, detailed descriptions of parts that are the same as or corresponding to those in the prior art will be omitted, and the same reference numerals will be used throughout the drawings to indicate the same or corresponding parts. 1 is a schematic diagram illustrating the configuration of an agitator 10 according to an embodiment of the present invention. As shown in the figure, the agitator 10 according to the embodiment of the present invention includes a main body 12 having a pair of agitating blades 14 (14A, 14B) attached to the tip thereof, a pair of ailerons 20 (20A, 20B), and an attachment portion 50.

[0020] The main body 12 constitutes the main body of the agitator 10 and is shaped like a hollow rod, with multiple components attached to its exterior and interior. For example, piping (not shown) for supplying improvement material and air for ground improvement is attached to the main body 12, and the piping is covered with a steel cover 54 or the like and extends to the vicinity of the pair of agitator blades 14. The improvement material and air are supplied from improvement material and air supply sources connected to the rear ends of the piping through the interior of the piping, and the improvement material and / or air are discharged from the discharge ports at the tips of the piping. Two such piping may be provided to supply the improvement material and air separately, or a single piping may supply the improvement material and air simultaneously or separately by switching the supply source.

[0021] The pair of agitating blades 14 are attached to the main body 12 in opposite directions across the tip 12a thereof, with one agitating blade 14A positioned on the left side in FIG. 1(b) and the other agitating blade 14B positioned on the right side in FIG. 1(b). Each of the pair of agitating blades 14A, 14B is provided with a plurality of cutting blades 16 on its outer periphery and is rotated by a motor (described later). The pair of agitating blades 14A, 14B are attached to the tip 12a of the main body 12 so that their respective rotation axes are perpendicular or nearly perpendicular to the extension direction of the main body 12 (the vertical direction in FIG. 1). In the embodiment shown in FIG. 1, the angle formed between each rotation axis and the extension direction of the main body 12 is slightly inclined toward the tip of the main body 12 (the downward direction in the figure) so that it is less than 90°.

[0022] Each of the pair of agitator blades 14A, 14B incorporates a motor (not shown). These motors rotate the agitator blades 14A, 14B using power (e.g., hydraulic power) supplied from, for example, heavy equipment 70 (see FIGS. 2 and 3), and the power is supplied through the interior of the main body 12. These motors may also be configured to individually control the rotation direction, rotation speed, rotation torque, etc. of the agitator blades 14. With this configuration, during construction using the agitator 10, the pair of agitator blades 14A, 14B are rotated by the motors incorporated in each, and the ground G (see FIGS. 2 and 3) is excavated and agitated by the multiple cutting blades 16 that rotate and move along the outer periphery of the agitator blades 14A, 14B.

[0023] The pair of ailerons 20 are provided at positions corresponding to the pair of agitating blades 14, and as shown in Figure 1 (b), one aileron 20A is provided above one agitating blade 14A, and the other aileron 20B is provided above the other agitating blade 14B. That is, when viewed in the axial direction of the main body 12, one agitating blade 14A and one aileron 20A are in a positional relationship where they overlap, and the other agitating blade 14B and the other aileron 20B are in a positional relationship where they overlap. In this embodiment, each of the pair of ailerons 20A, 20B has a hollow tubular shaft portion 22 and an auxiliary blade 24 provided on the outer periphery of the shaft portion 22.

[0024] Each of the pair of ailerons 20A, 20B is axially rotatably attached to the main body 12 along the extension direction of the main body 12. Specifically, the ailerons 20A, 20B extend downward (toward the tip) from a base 40 installed above (at the rear end) of the main body 12 to the vicinity of the agitator 14, with their midpoints rotatably supported by a support member 42 connected to the main body 12. Two motors 34 are installed on the base 40, which rotate using hydraulic power or other power supplied from a heavy machine 70, and these two motors 34 cause the pair of ailerons 20A, 20B to rotate independently. Each of the motors 34 is capable of controlling the axial rotation direction of the aileron 20, and may also be configured to control the rotation speed and rotation torque. Preferably, the pair of ailerons 20A, 20B is detachably attached to the main body 12.

[0025] As described above, the shaft 22 of each aileron 20 is hollow tubular and is connected to a supplier of the improving agent and air, for example, via a swivel connected to the rear end, in the same manner as the piping of the main body 12. The improving agent and / or air supplied through the inside of the shaft 22 is then discharged from the outlet 36 at the tip of the shaft 22 toward the mixing blade 14 corresponding to each aileron 20. The shaft 22 of each aileron 20 may supply either the improving agent or air, or may supply a mixture of the improving agent and air simultaneously, or may be configured to supply only one of the improving agent and air by switching the supply source.

[0026] In this embodiment, the aileron 24 of each aileron 20 is composed of a plurality of plate blades 26. For example, looking at one aileron 20A in FIG. 1(b), ten plate blades 26 are provided on the outer periphery of the shaft portion 22. The ten plate blades 26 are arranged alternately in the up-and-down direction along the shaft portion 22, with some plate blades 26 protruding from the outer periphery of the shaft portion 22 to the right in the figure and inclined downward toward the front of the figure and others protruding from the outer periphery of the shaft portion 22 to the left in the figure and inclined downward toward the back of the figure. More specifically, each of the plate blades 26 protruding to the right in FIG. 1(b) has one plate surface facing upward and left and the other plate surface facing downward and right in a front view from the right direction in FIG. 1(b). These five plate blades 26 are shown in dashed lines in Figure 1(a), and since Figure 1(a) is a view from the left in Figure 1(b), the orientation of the two plate surfaces is shown reversed from that described above.

[0027] Furthermore, each of the plate blades 26 protruding to the left in FIG. 2(b) has one plate surface facing upward and left, and the other plate surface facing downward and right, when viewed from the front from the left direction in FIG. 2(b) (corresponding to FIG. 1(a)). These five plate blades 26 are illustrated in FIG. 1(a) by solid lines with the plate surfaces oriented as described above. That is, each of the ten plate blades 26 has two plate surfaces facing upward and left and downward and right, when viewed from the front toward the outer periphery of the shaft portion 22. When the aileron 20A having the aileron blades 24 configured in this manner is rotated about its axis counterclockwise as viewed from above in FIG. 1, an upward force in FIG. 1 is applied to the surroundings by the inclined plate blades 26, and when rotated about its axis clockwise, a downward force in FIG. 1 is applied to the surroundings by the inclined plate blades 26.

[0028] In contrast, as can be seen in FIG. 1( b), the other aileron 20B has ten plate blades 26 arranged symmetrically with the one aileron 20A. That is, each of the ten plate blades 26 of the aileron 20B has two plate surfaces facing the upper right and lower left when viewed from the front toward the outer periphery of the shaft 22. Therefore, when the aileron 20B is rotated clockwise as viewed from above in FIG. 1, the inclined plate blades 26 exert an upward force on the surrounding area in FIG. 1, while when the aileron 20B is rotated counterclockwise, the inclined plate blades 26 exert a downward force on the surrounding area in FIG. 1. Therefore, during construction using the mixing device 10, the pair of ailerons 20 are rotated axially in any direction by the motor 34, and the surrounding soil and sand are stirred and moved by the multiple plate blades 26 that rotate and move as a result.

[0029] 2 and 3, the mounting portion 50 is used to mount the main body 12 having the above-described configuration to a work machine 72 of a hydraulic excavator 70A, which is the heavy machine 70 of this embodiment. More specifically, the mounting portion 50 mounts the main body 12 to the work machine 72 so that the tip of the main body 12 faces downward in front of the hydraulic excavator 70A (the near side in the figure) and the pair of mixing blades 14A, 14B and the pair of ailerons 20A, 20B are located on the left and right sides of the hydraulic excavator 70A in the lateral direction (the left and right sides in the figure). The mixing device 10 mounted on the hydraulic excavator 70A in this manner can be moved up and down by operating the work machine 72 and can be rotated by rotating the work machine 72.

[0030] Next, a mechanical mixing method according to an embodiment of the present invention, in which the mixing device 10 having the above-described configuration is used to mix and improve the ground G, will be described with reference to Figures 2 and 3. For the configuration of the mixing device 10, please refer to Figure 1 as appropriate. First, as shown in Figure 2(a), the agitator 10 is attached to the work implement 72 of the heavy machine 70 (hydraulic excavator 70A) via the mounting part 50. Then, while rotating the pair of agitator blades 14, the agitator 10 is moved downward by operating the work implement 72, thereby starting excavation of the ground G. In addition, as the pair of agitator blades 14 rotate, improvement material and air are supplied from a discharge port (not shown) of the main body 12, and the improvement material and the formation soil of the ground G are mixed and agitated.

[0031] Furthermore, the pair of ailerons 20 are axially rotated by the motor 34 at the latest when the tips of the pair of ailerons 20 penetrate into the ground G. The direction of axial rotation at this time is the rotation direction (forward direction) in which the auxiliary blades 24 of both the pair of ailerons 20A and 20B push the surrounding soil upward, as shown in FIG. 2(b). Furthermore, depending on the situation, improvement material and air are supplied from the outlets 36 of the pair of ailerons 20. Then, as shown in FIG. 2(b), the penetration of the mixer 10 into the ground G continues, and as shown in FIG. 2(c), the mixer 10 penetrates to the design depth. During this penetration operation, the rotation of the pair of agitator blades 14, the supply of improvement material and air from the main body 12, the forward axial rotation of the pair of ailerons 20, and the supply of improvement material and air from the pair of ailerons 20 are continuously performed.

[0032] Next, as shown in FIG. 3(a), the direction of axial rotation of the pair of ailerons 20 driven by the motor 34 is switched to a rotation direction (reverse direction) in which the auxiliary blades 24 of both the pair of ailerons 20A and 20B push the surrounding soil downward. Then, the work implement 72 is operated to move the mixer 10 upward, and the mixer 10 begins to be pulled out of the ground G. The mixer 10 continues to be pulled out of the ground G as shown in FIG. 3(b), and as shown in FIG. 3(c), the mixer 10 is pulled out until the pair of mixer blades 14 reach the vicinity of the ground. During this pulling operation, the pair of mixer blades 14 rotate, the main body 12 supplies improvement material and air, the pair of ailerons 20 rotate around their axes in the opposite directions, and the pair of ailerons 20 supplies improvement material and air. As a result, improved soil S is formed in the ground G.

[0033] The mixing device 10 according to the embodiment of the present invention is not limited to the configuration shown in FIGS. 1 to 3 and may have other configurations. For example, the aileron 20's auxiliary blades 24 may be composed of more or fewer blades 26 than those shown in FIG. 1. As long as each blade 26 is inclined in the same direction in a front view, the inclination angle of each blade, the distance between adjacent blades 26 in the extension direction of the shaft 22, and the direction of protrusion from the shaft 22 in an axial view of the shaft 22 are optional. Furthermore, as shown in FIG. 4, the aileron 20's auxiliary blades 24 may be composed of plate-like members 28 spirally arranged around the shaft 22, or two or more such plate-like members 28 may be intermittently arranged. The mixing device 10 may also be mounted on a large-diameter hydraulic drilling machine equipped with a leader, which serves as a heavy equipment 70. In this case, the mixing device 10 is mounted so as to move vertically along the leader of the working equipment of the large-diameter hydraulic drilling machine equipped with a leader.

[0034] The above-described embodiment of the present invention provides the following advantageous effects. Specifically, the mixing device 10 according to the embodiment of the present invention is attached to the work implement 72 of a heavy machine 70 as shown in FIGS. 2 and 3. As shown in FIG. 1, the mixing device 10 includes a main body 12 and an aileron 20. The main body 12 is rod-shaped, and an agitator 14 having multiple cutting blades 16 is attached to its tip. When the rear end of the main body 12 is attached to the work implement 72 of the heavy machine 70, the agitator 14 at the tip is rotated, penetrating the ground G and excavating the ground G with the multiple cutting blades 16. Furthermore, the main body 12 is provided with a discharge port near the agitator 14 for supplying improvement material and / or air. By supplying improvement material and / or air through the discharge port while excavating the ground G, the soil forming the ground G can be mixed and stirred with the improvement material and / or air.

[0035] The aileron 20 is an elongated member attached to the main body 12 in the extension direction of the main body 12 at a position rearward of the agitating blade 14, and is attached to the main body 12 so as to be rotatable about its axis. The aileron 20 includes a shaft 22 and an auxiliary blade 24 provided along the outer periphery of the shaft 22, and the auxiliary blade 24 is made up of a plurality of plate blades 26 or one or more plate-like members 28 (see FIG. 4). Specifically, when the auxiliary blade 24 is made up of a plurality of plate blades 26, the plurality of plate blades 26 are provided on the outer periphery of the shaft 22 with the plate surfaces tilted in the same direction in the up-down and left-right directions relative to the rotation direction of the shaft 22. That is, when the extension direction of the shaft portion 22 is in the up-down direction and each of the multiple plate blades 26 is viewed from the front toward the outer surface of the shaft portion 22, the two plate surfaces are all inclined in the same direction, with the two plate surfaces facing the upper left and lower right directions, or the two plate surfaces facing the lower left and upper right directions.

[0036] 4, when the aileron 24 is composed of one or more plate-like members 28, the plate-like member 28 is arranged in a continuous spiral around the outer periphery of the shaft portion 22 when there is one plate-like member 28, and in a discontinuous spiral when there are two or more plate-like members 28. That is, even in this case, when viewed from the front facing the outer periphery of the shaft portion 22 from any position with the extension direction of the shaft portion 22 being the up-down direction, the one or more plate-like members 28 are uniformly inclined so that two plate surfaces face in the upper left and lower right directions, or two plate surfaces face in the lower left and upper right directions. As a result, when the aileron 20 is rotated about its axis in one direction (forward direction), the inclined aileron 24 can apply an upward force (towards the rear end) to the surroundings, and when the aileron 20 is rotated about its axis in the other direction (reverse direction), the inclined aileron 24 can apply a downward force (towards the tip end) to the surroundings.

[0037] Therefore, as shown in FIG. 2, when the mixing device 10 according to the embodiment of the present invention penetrates the ground G, the aileron 20 is rotated in the forward direction, and the soil excavated by the mixing blade 14 near the tip of the main body 12 is discharged toward the ground by the auxiliary blade 24 of the aileron 20 located at the rear end of the mixing blade 14. This reduces the soil pressure in the ground G, thereby improving excavation efficiency. Furthermore, as shown in FIG. 3, when the mixing device 10 is withdrawn from the ground G, the aileron 20 is rotated in the reverse direction, forcibly mixing the soil around the aileron 20 and sending it toward the mixing blade 14, where it is mixed by the mixing blade 14. This reduces the occurrence of lumps of soil that are not fully improved, thereby creating a dense solidified body. Furthermore, there is no need for remixing or increasing the number of blade cuts, and the formation soil and improvement material in the ground G can be efficiently mixed, thereby improving construction speed.

[0038] 1, the agitator 10 according to the embodiment of the present invention has a hollow tubular shaft 22 of the aileron 20, and is configured such that, for example, a swivel is installed at the rear end of the shaft 22 to supply improvement material or air, which is then discharged through the interior of the shaft 22 from the outlet 36 at the tip of the shaft 22. This allows improvement material and air to be discharged from the shaft 22 of the aileron 20 in addition to being discharged from the main body 12, making it possible to more efficiently mix the formation soil of the ground G with improvement material, etc., and also to prevent soil and sand from adhering to the agitator 14 by discharging the improvement material and air from the outlet 36 of the shaft 22 toward the agitator 14.

[0039] Furthermore, the mixing device 10 according to the embodiment of the present invention is provided with a pair of mixing blades 14 and ailerons 20. The pair of mixing blades 14A, 14B are arranged on either side of the central axis of the main body 12, and the pair of ailerons 20A, 20B are arranged at positions corresponding to the pair of mixing blades 14A, 14B when viewed in the axial direction of the main body 12. That is, when viewed in the axial direction of the main body 12, the mixing blades 14A and 20A are arranged in a positional relationship such that one mixing blade 14A and one aileron 20A overlap at least partially, and the other mixing blade 14B and the other aileron 20B overlap at least partially. This allows the pair of mixing blades 14A, 14B to perform balanced excavation and mixing at positions sandwiching the central axis of the main body 12, and the pair of ailerons 20A, 20B to perform soil removal and soil delivery to the mixing blades 14A, 14B at positions corresponding to the respective mixing blades 14A, 14B. This makes it possible to more efficiently excavate the formation soil of the ground G and mix the formation soil of the ground G with the improvement material.

[0040] 2 and 3, when the heavy equipment 70 to which the mixing device 10 according to the embodiment of the present invention is attached is a hydraulic excavator 70A, it can be used mainly for construction work on shallow ground G, and because the hydraulic excavator 70A is maneuverable, it can be used for construction work on sites with a variety of conditions. On the other hand, when the heavy equipment 70 to which the mixing device 10 is attached is a hydraulic large-diameter drilling machine with a leader, it can be used for construction work at a variety of depths, and furthermore, because the leader of the hydraulic large-diameter drilling machine with a leader acts as a guide for the mixing device 10, improvement in construction accuracy in the vertical direction can be expected. On the other hand, the mechanical mixing method according to the embodiment of the present invention can achieve the same effects as those of the mixing device 10 by being carried out using the mixing device 10 according to the embodiment of the present invention as described above. [Explanation of symbols]

[0041] 10: Mixing device, 12: Main body, 14 (14A, 14B): Mixing blade, 16: Cutting blade, 20 (20A, 20B): Aileron, 22: Shaft, 24: Auxiliary blade, 26: Plate blade, 28: Plate-shaped member, 70: Heavy equipment, 70A: Hydraulic excavator, 72: Work equipment, G: Ground

Claims

1. A mixing device that is attached to a heavy machinery working machine and mixes the ground while supplying improvement material and / or air, a rod-shaped main body having an agitating blade attached to the tip thereof for agitating the ground with a plurality of cutting blades while rotating, and a discharge port provided near the agitating blade for supplying improvement material and / or air; a long auxiliary blade attached to the main body portion on the rear end side of the stirring blade along the extension direction of the main body portion so as to be rotatable about its axis, The aileron includes a shaft portion and an aileron blade provided along an outer periphery of the shaft portion, The auxiliary blades are composed of a plurality of plate blades whose plate surfaces are inclined in the same direction in the vertical and horizontal directions with respect to the rotation direction of the shaft portion, or one or more plate-like members arranged in a spiral, The shaft portion is a hollow tube, and is configured to discharge an improving agent or air from the tip through the inside of the shaft portion.

2. A mixing device that is attached to a heavy machinery working machine and mixes the ground while supplying improvement material and / or air, a rod-shaped main body having an agitating blade attached to the tip thereof for agitating the ground with a plurality of cutting blades while rotating, and a discharge port provided near the agitating blade for supplying improvement material and / or air; a long auxiliary blade attached to the main body portion on the rear end side of the stirring blade along the extension direction of the main body portion so as to be rotatable about its axis, The aileron includes a shaft portion and an aileron blade provided along an outer periphery of the shaft portion, The auxiliary blades are composed of a plurality of plate blades whose plate surfaces are inclined in the same direction in the vertical and horizontal directions with respect to the rotation direction of the shaft portion, or one or more plate-like members arranged in a spiral, The stirring blades are provided as a pair on either side of the central axis of the main body, The agitator is characterized in that a pair of the auxiliary blades are provided at positions corresponding to the pair of agitating blades when viewed in the axial direction of the main body.

3. The stirring blades are provided as a pair on either side of the central axis of the main body, 2. The stirring device according to claim 1, wherein a pair of the auxiliary blades are provided at positions corresponding to the pair of stirring blades when viewed in the axial direction of the main body.

4. 4. The mixing device according to claim 1, wherein the heavy machinery is a hydraulic excavator or a hydraulic large-diameter drilling machine with a leader.

5. A mechanical mixing method for improving ground using a mixing device attached to a heavy machinery working machine that mixes the ground while supplying improvement material and / or air, The stirring device includes a rod-shaped main body having a stirring blade attached to the tip thereof for stirring the ground with a plurality of cutting blades while rotating, and a discharge port for supplying improvement material and / or air provided in the vicinity of the stirring blade, and a long auxiliary blade attached to the main body rearward of the stirring blade and along the extending direction of the main body so as to be rotatable about its axis, The aileron includes a shaft portion and an aileron blade provided along an outer periphery of the shaft portion, The auxiliary blades are composed of a plurality of plate blades whose plate surfaces are inclined in the same direction in the vertical and horizontal directions with respect to the rotation direction of the shaft portion, or one or more plate-like members arranged in a spiral, When the agitator penetrates, the aileron is rotated around its axis in a direction that moves the surrounding soil and sand upward, and when the agitator is pulled out, the aileron is rotated around its axis in a direction that moves the surrounding soil and sand downward, A mechanical mixing method characterized by using the shaft portion having a hollow tubular shape and discharging an improving material or air from the tip through the inside of the shaft portion.

6. A mechanical mixing method for improving ground by using a mixing device attached to a heavy machinery working machine that mixes the ground while supplying improvement material and / or air, The stirring device includes a rod-shaped main body having a stirring blade attached to the tip thereof for stirring the ground with a plurality of cutting blades while rotating, and a discharge port for supplying improvement material and / or air provided in the vicinity of the stirring blade, and a long auxiliary blade attached to the main body rearward of the stirring blade and along the extending direction of the main body so as to be rotatable about its axis, The aileron includes a shaft portion and an aileron blade provided along an outer periphery of the shaft portion, The auxiliary blades are composed of a plurality of plate blades whose plate surfaces are inclined in the same direction in the vertical and horizontal directions with respect to the rotation direction of the shaft portion, or one or more plate-like members arranged in a spiral, When the agitator penetrates, the aileron is rotated around its axis in a direction that moves the surrounding soil and sand upward, and when the agitator is pulled out, the aileron is rotated around its axis in a direction that moves the surrounding soil and sand downward, The stirring blades are provided as a pair in such a manner that the central axis of the main body is sandwiched between the stirring blades, A mechanical mixing method characterized in that a pair of auxiliary blades are provided at positions corresponding to the pair of mixing blades when viewed in the axial direction of the main body.

7. The stirring blades are provided as a pair in such a manner that the central axis of the main body is sandwiched between the stirring blades, 6. The mechanical mixing method according to claim 5, wherein a pair of the auxiliary blades are provided at positions corresponding to the pair of the mixing blades when viewed in the axial direction of the main body.

8. 8. The mechanical mixing method according to claim 5, wherein a hydraulic excavator or a hydraulic large-diameter drilling machine with a leader is used as the heavy machinery.

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