JP2023184610A - Agitator - Google Patents

Abstract

To provide an agitator having a constitution capable of improving fragmentation performance fragmenting clods.SOLUTION: In an agitator according to the present invention comprising a cylindrical shaft part, an agitation blade corotating with the shaft part and a corotation prevention part which is relatively and rotatably attached to the shaft part and where at least a part is disposed so as to be apart from a space at the tip side of the shaft part in a shaft direction to the agitation blade, one end in a rotation direction at a drilling work in the circumferential direction of the shaft part is closer to the base end of the shaft part than the other end in the reverse direction of the rotation direction in the circumferential direction in an undersurface positioning at the tip side of the agitation blade in the shaft direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a stirring device.

Conventionally, in the ground on which a building is constructed, ground improvement is performed when the depth from the ground surface to the layer (supporting ground surface) that has the hardness to support the load of the building exceeds a predetermined depth. In some cases, the deep mixing method is selected as the construction method for this purpose. The deep mixing method involves injecting a soil solidifying agent such as cement milk into the original ground while excavating and stirring to form column-shaped improved ground made by mixing cement with soil. In this construction method, an auger equipped with a stirring device with excavating blades is used to dig into the original ground to form column-shaped improved ground directly beneath the foundation of a building.

Patent Document 1 discloses a mixing and stirring device for a ground improvement machine that mixes and stirs soil and a coagulant, which can be used in a deep mixing method as a stirring device. The mixing and stirring device of Patent Document 1 includes an inclined stirring blade and at least one co-rotation prevention blade that is inclined in the opposite direction to the inclined stirring blade.

Utility model registration No. 3036702

The mixing and stirring device as a stirring device in Patent Document 1 includes a stirring blade that rotates and tilts downward so as to scoop up the excavated soil during excavation, and a co-rotation prevention blade that slopes in the opposite direction to the stirring blade. Equipped with. The co-rotation prevention blade rotates while cutting into the mixture of soil and coagulant that is about to rotate as the stirring blade rotates, thereby preventing the soil from forming into lumps.

That is, according to the mixing and stirring device described in Patent Document 1, a shearing force is applied to the soil clod by the stirring blade and the co-rotation prevention blade, and the soil clot is finely broken or pinched in the shearing direction (hereinafter simply referred to as " It is possible to mix the excavated soil and cement in the excavated hole.

However, the mixing and agitating device described in Patent Document 1 has room for further improvement in the fragmentation performance of the soil clod.

SUMMARY OF THE INVENTION An object of the present invention is to provide an agitation device having a configuration capable of improving the performance of dividing soil clods into small pieces.

A stirring device according to a first aspect of the present invention includes a cylindrical shaft portion, a stirring blade that rotates together with the shaft portion, and is attached to be rotatable relative to the shaft portion, and at least a co-rotation prevention part, a part of which is disposed on the axial tip side of the shaft part with a gap from the stirring blade, and a lower surface located on the axial tip side of the stirring blade. In this, one end of the shaft portion in the rotational direction during excavation work in the circumferential direction is closer to the base end of the shaft portion than the other end in the circumferential direction in the opposite direction to the rotational direction. It is something.

As one embodiment of the present invention, it is preferable that the lower surface is inclined with respect to the circumferential direction so as to approach the base end of the shaft part as it goes in the rotation direction during excavation work.

In one embodiment of the present invention, the co-rotation prevention part has a through hole penetrating in the axial direction, and the stirring blade is located at a proximal end side in the axial direction with respect to the through hole. It is preferable that it is rotatable relative to the co-rotation prevention part.

In the stirring device according to one embodiment of the present invention, when the stirring blade is a first stirring blade, the stirring blade rotates together with the shaft portion, and at a position on the tip side in the axial direction with respect to the through hole. A plate-shaped second stirring blade is provided that is rotatable relative to the co-rotation prevention part, and the second stirring blade is inclined toward the tip of the shaft part as it goes in the rotation direction. It is preferable that

In one embodiment of the present invention, the shortest distance between the first stirring blade and the through hole is preferably shorter than the shortest distance between the second stirring blade and the through hole in the axial direction.

In one embodiment of the present invention, the co-rotation prevention part includes a plurality of co-rotation prevention blades that protrude radially outward of the shaft part, the first stirring blade and the second stirring blade in the axial direction. a connecting member that connects adjacent co-rotation prevention blades in the circumferential direction at a first position between the stirring blade, and the through hole connects the connecting member and the stirring blade at the first position in the axial direction. Preferably, it is formed at a position between the shaft portion and the shaft portion.

In one embodiment of the present invention, each of the plurality of co-rotation prevention blades is connected to the radially extending first blade portion and the first blade portion at the first position in the axial direction. a second wing section extending toward the tip side in the axial direction; and a second wing section that is continuous with the second wing section and is located inside the radial direction at a second position closer to the tip side in the axial direction than the second stirring blade. and a third wing portion whose tip portion is not attached to the shaft portion, and when the connecting member is the first connecting member, the first connecting member is a second connecting member connecting first wing parts adjacent in the circumferential direction at the first position, and connecting third wing parts adjacent in the circumferential direction at the second position in the axial direction; It is preferable to further include.

As one embodiment of the present invention, when the through hole is a first through hole, at the second position in the axial direction, at a position between the second connecting member and the shaft part, the It is preferable that a second through hole is formed that penetrates in the axial direction.

As one embodiment of the present invention, it is preferable that at least one of the first connecting member and the second connecting member includes a curved portion extending in the circumferential direction around the shaft portion.

As one embodiment of the present invention, it is preferable that the at least one connecting member further includes a protruding part that is continuous with the curved part and projects from the curved part in the radial direction.

An agitation device according to an embodiment of the present invention includes a plate-shaped third agitation blade disposed on the proximal end side in the axial direction with respect to the first agitation blade, with a gap between the third agitation blade and the third agitation blade. It is preferable that the stirring blades are inclined so as to approach the tip of the shaft portion in the direction of rotation.

Preferably, the stirring device according to one embodiment of the present invention further includes a digging blade provided at the tip of the shaft portion.

According to the present invention, it is possible to provide an agitation device having a configuration that can improve the fragmentation performance of dividing soil clods.

FIG. 1 is a side view of a stirring device as an embodiment of the present invention. FIG. 2 is a diagram showing the cross-sectional shape of the stirring blade shown in FIG. 1 and the positional relationship in the axial direction of the shaft portion of the stirring blade and the co-rotation prevention part. FIG. 2 is a cross-sectional view at the position of the first wing portion of the co-rotation prevention wing, which is the first position in the axial direction of the shaft portion shown in FIG. 1; FIG. 2 is a cross-sectional view at the position of the third wing portion of the co-rotation prevention wing, which is the second position in the axial direction of the shaft portion shown in FIG. 1 .

Embodiments of the stirring device according to the present invention will be described below with reference to FIGS. 1 to 4. Note that common members in each figure are given the same reference numerals.

FIG. 1 is a side view of a stirring device 1 as one embodiment of the stirring device according to the present invention.

The stirring device 1 is attached to the lower tip of an auger (not shown) serving as a driving device, is rotationally driven by the auger, and excavates and stirs underground layers to be ground improved. As shown in FIG. 1, the stirring device 1 includes a shaft portion 2, a digging blade 3, a stirring blade 4, and a co-rotation prevention portion 5.

The shaft portion 2 has a cylindrical shape and serves as a rotation center when being rotationally driven by an auger.

As described above, the shaft portion 2 has a uniaxial and single cylindrical shape, and has a hollow portion defined therein. The hollow part in the shaft part 2 penetrates from the base end of the shaft part 2 to the opening 2a formed in the side surface of the tip part of the shaft part 2, and the shaft part 2 is used for the stirring device 1 to excavate the ground. In some cases, it also serves as a pipe that can supply a cement-based solidifying agent such as cement milk as a ground solidifying agent into the ground through the hollow part. Further, the base end of the shaft portion 2 is provided with a connecting portion (not shown) that can be connected to the auger, and the shaft portion 2 is rotationally driven by the auger when the connecting portion is connected to the auger. Ru.

Note that a backflow prevention valve 50 is provided in the opening 2a. This check valve 50 is normally closed to prevent excavated soil, groundwater, etc. in the excavated hole from entering the hollow portion of the shaft portion 2. Then, when the soil solidification material is sent through the hollow part by applying a pressure higher than the earth pressure in the excavation hole outside the stirring device 1, the backflow prevention valve 50 opens and the soil solidification material is ejected into the excavation hole through the opening 2a. can do. In this embodiment, only one opening 2a and one check valve 50 are provided, but the number of openings 2a and check valve 50 is not limited to one, and two or more may be provided. .

The excavating blade 3 is provided at the tip of the shaft portion 2. Specifically, the excavating blade 3 of this embodiment is integrated by being joined to the tip of the shaft portion 2 by welding. The excavation blade 3 excavates the ground, and also stirs and mixes the excavated soil and the ground solidification material. This results in improved soil that is a mixture of excavated soil and soil solidification material. This improved soil still contains clods from the excavated soil. In the stirring device 1 of this embodiment, a plurality of excavation blades 3 are provided that protrude from the outer surface of the shaft portion 2 toward the outside in the radial direction B of the shaft portion 2. More specifically, the excavation blades 3 of this embodiment are provided one each on both sides of the shaft portion 2. A plurality of (four in this embodiment) digging claws 3a projecting outward are provided on the outer surface of each digging blade 3. As shown in FIG. 1, the opening 2a of the present embodiment is located at a position where the excavation blade 3 is provided in the axial direction A of the shaft portion 2 and adjacent to the excavation blade 3 in the circumferential direction C of the shaft portion 2. It is formed on the side surface of the shaft portion 2 at a position between.

Although two excavation blades 3 in this embodiment are provided as described above, the number is not limited to this, and for example, a configuration may be provided in which three or more excavation blades are provided. In such a case, it is preferable from the viewpoint of excavation efficiency to provide the excavation blades 3 at equally spaced positions in the circumferential direction C of the shaft portion 2.

Further, the number of digging claws 3a is not limited to the number shown in this embodiment, and can be changed as appropriate in consideration of desired digging performance and the like.

The stirring blade 4 rotates together with the shaft portion 2 (hereinafter referred to as "co-rotation"), and stirs the improved soil in the excavation hole that has been excavated by the excavation blade 3 and mixed with the ground solidification material. Specifically, the stirring blade 4 of this embodiment is a long plate member that protrudes outward in the radial direction B from the shaft portion 2, and one end portion inside the radial direction B, which is one side in the longitudinal direction, is a long plate member. , is integrated with the shaft portion 2 by being joined to the shaft portion 2 by welding. Further, the stirring blades 4 are inclined so as to approach the tip or base end of the shaft portion 2 as they go in one direction in the circumferential direction C of the shaft portion 2. That is, the elongated plate member constituting the stirring blade 4 is inclined with respect to the shaft portion 2 so as to approach the tip or base end of the shaft portion 2 as it goes in one direction in the circumferential direction C of the shaft portion 2. are joined together.

The stirring device 1 of this embodiment includes three stirring blade groups 30a, 30b, and 30c. Specifically, in the stirring device 1 of this embodiment, the second stirring blade group 30b, the first stirring blade group 30a, and the third stirring blade group 30c are arranged in this order from the tip side to the base end side of the shaft portion 2. There is.

The first stirring blade group 30a includes a plurality of (two in this embodiment) first stirring blades 4a. Further, the second stirring blade group 30b also includes a plurality of (two in this embodiment) second stirring blades 4b. Furthermore, the third stirring blade group 30c also includes a plurality of (two in this embodiment) third stirring blades 4c.

Here, FIG. 2 shows cross-sectional shapes perpendicular to the longitudinal direction of the first stirring blade 4a, the second stirring blade 4b, and the third stirring blade 4c, as well as the first stirring blade 4a, the second stirring blade 4b, and the third stirring blade. 4c and the co-rotation prevention portion 5 in the axial direction A. FIG. As shown in FIG. 2, the first stirring blade 4a has a plate-like shape, and the cross-sectional shape perpendicular to the longitudinal direction of the first stirring blade 4a is a long and narrow rectangular shape that is inclined with respect to the axial direction A. be. In other words, the first stirring blade 4a has two slopes that are inclined and parallel to the axial direction A and the circumferential direction C, and the upper surface 10a located on the base end side of the shaft portion 2 and the tip of the shaft portion 2. A lower surface 10b located on the side, an upper end surface 10c connecting the upper surface 10a and the lower surface 10b on the proximal end side of the shaft section 2 in the axial direction A, and an upper end surface 10c connecting the upper surface 10a and the lower surface 10b on the distal end side of the shaft section 2 in the axial direction A. A connecting lower end surface 10d is provided.

Further, the second stirring blade 4b also has a plate-like shape, and the cross-sectional shape of the second stirring blade 4b perpendicular to the longitudinal direction is also the same as that of the first stirring blade 4a. Specifically, the cross-sectional shape of the second stirring blade 4b is a long and narrow rectangle inclined with respect to the axial direction A. In other words, the second stirring blade 4b is inclined with respect to the axial direction A and has two parallel slopes, the upper surface 11a located on the base end side of the shaft portion 2 and the top surface 11a located on the tip side of the shaft portion 2. A lower surface 11b, an upper end surface 11c that connects the upper surface 11a and the lower surface 11b at the base end side of the shaft section 2 in the axial direction A, and a lower end surface that connects the upper surface 11a and the lower surface 11b at the distal end side of the shaft section 2 in the axial direction A. 11d.

Furthermore, the third stirring blade 4c also has a plate-like shape, and the cross-sectional shape perpendicular to the longitudinal direction of the third stirring blade 4c is also the same as that of the first stirring blade 4a and the second stirring blade 4b. . Specifically, the cross-sectional shape of the third stirring blade 4c is an elongated substantially rectangular shape that is inclined with respect to the axial direction A. In other words, the third stirring blade 4c has an upper surface 12a and a lower surface 12b located on the base end side of the shaft portion 2, which are two parallel slopes that are inclined with respect to the axial direction A, and the upper surface 12a and the lower surface. 12b on the base end side of the shaft portion 2 in the axial direction A, and a lower end surface 12d that connects the upper surface 12a and the lower surface 12b on the distal end side of the shaft portion 2 in the axial direction A.

However, in this embodiment, the plate-shaped first stirring blade 4a is inclined on the opposite side from the plate-shaped second stirring blade 4b and third stirring blade 4c. Specifically, the plate-shaped first agitating blade 4a is arranged so that it approaches the base end of the shaft portion 2 in the circumferential direction C of the shaft portion 2 in the rotational direction C1 during excavation work. It is sloping. On the other hand, the plate-shaped second stirring blades 4b and third stirring blades 4c are arranged so that they approach the tip of the shaft portion 2 as they move in the rotational direction C1 during excavation work in the circumferential direction C of the shaft portion 2. It is inclined with respect to the circumferential direction C. Note that the rotation direction C1 during excavation work in the circumferential direction C means one direction in the circumferential direction C in which the shaft portion 2 rotates during the excavation work. Further, the inclination angles of the first stirring blade 4a, the second stirring blade 4b, and the third stirring blade 4c on the acute angle side with respect to the circumferential direction C of the present embodiment are substantially equal.

As shown in FIG. 1, the two first stirring blades 4a of this embodiment are arranged to face each other with the shaft portion 2 in between. Further, although only one of the second stirring blades 4b is illustrated in FIG. 1, the two second stirring blades 4b of this embodiment are also arranged to face each other with the shaft portion 2 in between. Further, although only one of the third stirring blades 4c is illustrated in FIG. 1, the two third stirring blades 4c of this embodiment are also arranged to face each other with the shaft portion 2 in between.

Furthermore, as shown in FIG. 1, the first stirring blade 4a and the second stirring blade 4b are provided at different positions in the circumferential direction C of the shaft portion 2. Specifically, the position where the first stirring blade 4a protrudes from the shaft portion 2 is approximately 90 degrees center angle in the circumferential direction C from the position where the second stirring blade 4b protrudes from the shaft portion 2. The degree is off. In other words, the first stirring blade 4a and the second stirring blade 4b are provided at positions that do not overlap in the axial direction A. Note that the second stirring blade 4b and the third stirring blade 4c are provided at positions that overlap in the axial direction A. In FIG. 2, for convenience of explanation, the first stirring blade 4a, the second stirring blade 4b, and the third stirring blade 4c are depicted in overlapping positions in the axial direction A. Therefore, in FIG. 2, the second stirring blade 4b and the third stirring blade 4c are shown by two-dot chain lines.

Further, as described above, the stirring blade 4 rotates together with the shaft portion 2, and stirs the improved soil in the excavation hole that has been excavated by the excavation blade 3 and mixed with the ground solidification material. In this embodiment, the outer end of the stirring blade 4 in the radial direction B is located at approximately the same position in the radial direction B as the outer end of the excavating blade 3 in the radial direction B.

Although the first stirring blade group 30a of the present embodiment includes two first stirring blades 4a, the number is not limited to this, and for example, the first stirring blade group 30a includes three or more first stirring blades. It may also be a stirring blade group. Similarly, the second stirring blade group 30b of this embodiment includes two second stirring blades 4b, but is not limited to this number; for example, it may include three or more second stirring blades. It may also be a second stirring blade group. Further, the third stirring blade group 30c of the present embodiment includes two third stirring blades 4c, but is not limited to this number. For example, the third stirring blade group 30c includes three or more third stirring blades. It is also possible to have three stirring blade groups. However, it is preferable from the viewpoint of stirring performance that the plurality of first stirring blades 4a are arranged at equal intervals in the circumferential direction C, regardless of the number thereof. The same applies to the plurality of second stirring blades 4b and the plurality of third stirring blades 4c. Further, in this embodiment, the number of first stirring blades 4a, the number of second stirring blades 4b, and the number of third stirring blades 4c are equal, but the number of first stirring blades and the number of second stirring blades are equal. The number of stirring blades and the number of third stirring blades may be different from each other.

Furthermore, in the present embodiment, the position where the first stirring blade 4a protrudes from the shaft portion 2 is lower than the position where the second stirring blade 4b and the third stirring blade 4c protrude from the shaft portion 2. Although the central angle in the circumferential direction C is shifted by about 90 degrees, the positional relationship in the circumferential direction C is not limited to this relationship. For example, the first stirring blade, the second stirring blade, and the third stirring blade are They may be formed at substantially the same position in the direction C, or may have a configuration in which the center angles are shifted by an angle different from 90 degrees in the circumferential direction C.

The co-rotation prevention part 5 is attached to the shaft part 2 so as to be rotatable relative to the shaft part 2. The outer end of the co-rotation prevention part 5 on the outer side in the radial direction B extends to the outer side than the excavation blade 3. Therefore, when excavating the ground with the agitation device 1, the outer end of the co-rotation prevention part 5 enters the inner wall 70 of the excavation hole (see FIGS. 3 and 4), and the excavation blade 3 and the agitation blade 4 They do not rotate together or are difficult to rotate together. Therefore, the improved soil is provided with a direction perpendicular to the axial direction A by the excavating blades 3 and stirring blades 4 that rotate together with the shaft part 2, and the co-rotation prevention part 5 that does not or is difficult to rotate together with the shaft part 2. Shear force acts. This shearing force allows the soil clods in the improved soil to be fragmented.

Further, the co-rotation prevention part 5 has a through hole X that penetrates in the axial direction A of the shaft part 2.

Specifically, the co-rotation prevention unit 5 of this embodiment includes a cylindrical portion 21 that is rotatably attached to the shaft portion 2 at a position around the shaft portion 2, and a cylindrical portion 21 that is rotatably attached to the shaft portion 2 at a position around the shaft portion 2. Connects a plurality of co-rotation prevention blades 22 that protrude outward in direction B and extend to the outside of the excavation blades 3 in radial direction B, and adjacent co-rotation prevention blades 22 in the circumferential direction C of the shaft portion 2. It includes a first connecting member 23 and a second connecting member 24.

The cylindrical portion 21 is loosely fitted around the shaft portion 2 and is rotatable in the circumferential direction C with respect to the shaft portion 2 . Note that the cylindrical portion 21 is fixed to the shaft portion 2 so as not to move in the axial direction A.

The co-rotation prevention blade 22 is provided to protrude outward in the radial direction B from the outer surface of the cylindrical portion 21, and is supported by the cylindrical portion 21 in a cantilevered state.

As shown in FIG. 1, the first connecting member 23 connects the co-rotation prevention blades 22 adjacent in the circumferential direction C at a first position P1 between the first stirring blade 4a and the second stirring blade 4b in the axial direction A. are connected. FIG. 3 is a cross-sectional view at a first position P1 in the axial direction A. As shown in FIG. 3, in this embodiment, the above-described through hole X is formed at a first position P1 in the axial direction A, between the first connecting member 23 and the shaft portion 2. As shown in FIG. 3, in this embodiment, a plurality of through holes X are formed. More specifically, there are two through holes X in this embodiment.

As shown in FIG. 1, the second connecting member 24 connects the co-rotation prevention blades 22 adjacent in the circumferential direction C at a second position P2 on the tip side in the axial direction A than the second stirring blade 4b. . FIG. 4 is a cross-sectional view at a second position P2 in the axial direction A. As shown in FIG. 4, at a second position P2 in the axial direction A, a hole other than the above-mentioned through hole A through hole Y is formed. Note that the second position P2 is a position closer to the tip than the second stirring blade 4b in the axial direction A, but closer to the base end than the excavation blade 3. Hereinafter, for convenience of explanation, the through hole X formed at the first position P1 in the axial direction A will be referred to as the "first through hole X", and the through hole Y formed at the second position P2 in the axial direction A. is described as "second through hole Y".

More specifically, as shown in FIGS. 1 to 4, the co-rotation prevention blade 22 of this embodiment has a first blade portion 22a extending in the radial direction B at a first position P1 in the axial direction A. , a second wing section 22b continuous with the first wing section 22a and extending toward the tip side in the axial direction A; and a second wing section 22b continuous with the second wing section 22b and extending in the radial direction at a second position P2 in the axial direction A. A third wing portion 22c that extends toward the inside of B and has a tip portion not attached to the shaft portion 2 is provided. In other words, the tip portion of the third wing portion 22c constitutes a free end, and is not fixed to the cylinder portion 21 or any other member rotatable with respect to the shaft portion 2. Therefore, the co-rotation prevention blade 22 of this embodiment has a U-shape when viewed from the side. As shown in FIG. 3, the first connecting member 23 of this embodiment connects the first wing portions 22a of the co-rotation prevention wings 22 adjacent in the circumferential direction C at a first position P1 in the axial direction A. There is. Further, as shown in FIG. 4, the second connecting member 24 of this embodiment connects the third wing portions 22c of the co-rotation prevention wings 22 adjacent in the circumferential direction C at the second position P2 in the axial direction A. are doing.

Furthermore, as shown in FIG. 3, the first through hole X of this embodiment is formed at a first position P1 in the axial direction A between adjacent first wing portions 22a in the circumferential direction C. Further, as shown in FIG. 4, the second through hole Y of this embodiment is formed at a second position P2 in the axial direction A between adjacent third wing portions 22c in the circumferential direction C. In addition, in this embodiment, since the tip of the third wing part 22c of the co-rotation prevention wing 22 is a free end that is not attached to the shaft part 2, as shown in FIG. The second through hole Y is not divided in the circumferential direction C by the third wing part 22c, but is one hole that is continuous in the circumferential direction C through between the tip of the third wing part 22c and the shaft part 2. is forming.

Note that the outer shape of the cross section perpendicular to the longitudinal direction of the first wing portion 22a is approximately square or rectangular, consisting of two sides perpendicular to the axial direction A and two sides extending in the axial direction A. . In other words, the first wing portion 22a includes a lower surface facing the distal end side of the shaft portion 2 in the axial direction A, an upper surface facing the proximal end side, and two side surfaces substantially parallel to the axial direction A. ing.

Further, the outer shape of the cross section perpendicular to the longitudinal direction of the second wing portion 22b is substantially square or rectangular, similar to the cross-sectional outer shape of the first wing portion 22a. During excavation by the stirring device 1, the portion of the second wing portion 22b located on the outside in the radial direction B sinks into the inner wall 70 of the excavation hole (see FIGS. 3 and 4), and the second wing portion 22b A resistance force such as a frictional force between the portion 22b and the inner wall 70 of the excavation hole prevents the co-rotation prevention portion 5 from co-rotating with the shaft portion 2. Note that in FIGS. 3 and 4, which will be referred to later, the position of the second wing portion 22b is indicated by a broken line.

Furthermore, the outer shape of the cross section perpendicular to the longitudinal direction of the third wing portion 22c is also substantially square or rectangular, similar to the cross-sectional outer shape of the first wing portion 22a. In other words, the third wing portion 22c includes a lower surface facing the distal end side of the shaft portion 2 in the axial direction A, an upper surface facing the proximal end side, and two side surfaces substantially parallel to the axial direction A. ing.

As shown in FIGS. 3 and 4, the co-rotation prevention unit 5 of this embodiment includes two co-rotation prevention blades 22 arranged at equal intervals of 180 degrees at a center angle in the circumferential direction C. The number of co-rotation prevention blades 22 and the interval in the circumferential direction C are not limited to the configuration of this embodiment. However, from the viewpoint of improving the agitation performance by obtaining the desired earth-retaining effect while suppressing the excessive increase in the torque resistance of the shaft portion 2 during excavation work due to the earth-retaining effect of the co-rotation prevention blades 22, the present invention was developed. It is preferable to use two co-rotation prevention blades 22 arranged at equal intervals in the circumferential direction C as in the embodiment.

Further, the first connecting member 23 and the second connecting member 24 of this embodiment connect the co-rotation prevention blades 22 adjacent in the circumferential direction C. Specifically, the first connecting member 23 of this embodiment is connected to the co-rotation prevention blade 22 by a fastening member 60 such as a bolt and nut while in contact with the co-rotation prevention blade 22 adjacent in the circumferential direction C. Fixed. In other words, the first connecting member 23 of this embodiment is a blade reinforcing member that is attached to the co-rotation prevention blades 22 adjacent in the circumferential direction C, thereby reinforcing the co-rotation prevention blades 22. With such a configuration, it is possible to suppress deformation of the co-rotation prevention blade 22 due to pressure such as earth pressure. Note that the first connecting member 23 of this embodiment is arranged between the first wing parts 22a of the co-rotation prevention blades 22 adjacent in the circumferential direction C, and is arranged on both sides of the first connecting member 23 in the circumferential direction C. is fastened to the first wing portion 22a by a fastening member 60 such as a bolt and a nut.

Further, the second connecting member 24 of this embodiment is also similar to the first connecting member 23 described above. The second connecting member 24 of this embodiment is arranged between the third wing portions 22c of the co-rotation prevention blades 22 adjacent in the circumferential direction C, and each side of the second connecting member 24 in the circumferential direction C is It is fastened to the third wing portion 22c by a fastening member 60 such as a bolt and a nut.

By providing the first connecting member 23 and the second connecting member 24 in this manner, the co-rotation prevention blade 22 can be reinforced, and deformation of the co-rotation prevention blade 22 due to earth pressure can be suppressed.

In this embodiment, the first through hole X is provided at a position between the first connecting member 23 and the shaft part 2. A second through hole Y is provided at a position between. In this way, by forming the first through hole X and the second through hole Y using the first connecting member 23 and the second connecting member 24, the above-mentioned co-rotation prevention wing 22 can be reinforced. In addition to this, it is possible to obtain a certain earth-retaining effect. Specifically, the improved soil that has entered the first through hole X and the second through hole Y can be blocked.

Further, the co-rotation prevention blade 22 of this embodiment protrudes further outward in the radial direction B of the shaft portion 2 than the first connecting member 23 and the second connecting member 24 . More specifically, the second wing portion 22b of the co-rotation prevention wing 22 of the present embodiment has a larger diameter than the below-described curved portion 23a (see FIG. 3) that constitutes the outer edge of the first connecting member 23 in the radial direction B. It is located on the outside in the radial direction B. Further, the second wing portion 22b of the co-rotation prevention wing 22 of the present embodiment is further arranged in the radial direction B than the later-described curved portion 24a (see FIG. 4) that constitutes the outer edge of the second connecting member 24 in the radial direction B. It is located outside of.

When excavating and stirring the ground with the stirring device 1, the curved portion 23a (see FIG. 3) constituting the outer edge of the first connecting member 23 in the radial direction B is connected to the inner wall 70 of the excavation hole (for convenience of explanation). , the position is indicated by a two-dot chain line in FIGS. An opening S1 (see FIG. 3) is formed in a region surrounded by the first wing portions 22a of the two co-rotation prevention wings 22 located on both sides of the connecting member 23 in the circumferential direction C. By providing such an opening S1, debris such as stones, wood chips, and waste in the ground can be discharged to the base end side in the axial direction A of the shaft portion 2 through the opening S1 during excavation work, for example. It is possible to suppress the deterioration of stirring performance due to the accumulation of debris. Further, it is possible to reduce the risk of debris getting caught in the gap between the first stirring blade 4a and the first blade part 22a, the gap between the second stirring blade 4b and the first blade part 22a, etc. . As a result, it is possible to prevent a portion of the stirring device 1 from becoming deformed due to being caught in the gap and applying a large local external force to a portion of the stirring device 1.

In addition, when excavating and stirring the ground with the stirring device 1, the curved portion 24a (see FIG. 4) that constitutes the outer edge of the second connecting member 24 in the radial direction B is connected to the inner wall 70 of the excavation hole (for convenience of explanation). , the position is indicated by a two-dot chain line in FIGS. An opening S2 (see FIG. 4) is formed in a region surrounded by the third wing portions 22c of the two co-rotation prevention wings 22 located on both sides of the connecting member 24 in the circumferential direction C. By providing such an opening S2, during excavation work, for example, debris can be easily discharged through the opening S2 to the base end side of the shaft portion 2 in the axial direction A, and the debris stays and is agitated. It is possible to suppress a decrease in performance. Further, the risk of debris getting caught in the gap between the second stirring blade 4b and the third blade portion 22c can be reduced. As a result, it is possible to prevent a portion of the stirring device 1 from becoming deformed due to being caught in the gap and applying a large local external force to a portion of the stirring device 1.

Note that the excavation blade 3 of this embodiment extends to the outside in the radial direction B of the curved portion 23a of the first connecting member 23 and the curved portion 24a of the second connecting member 24. Also, regarding the first stirring blade 4a, the second stirring blade 4b, and the third stirring blade 4c of this embodiment, the curved portion 23a of the first connecting member 23 and the curved portion 24a of the second connecting member 24 are extends to the outside. The excavating blade 3 and the first to third stirring blades 4a to 4c of this embodiment are located at approximately the same position in the radial direction B. In other words, the radius from the central axis O of the shaft portion 2 to the outer edge in the radial direction B (hereinafter simply referred to as “radial distance”) is the radius between the curved portion 24a of the second connecting member 24 and the first connecting member 23. The curved portion 23a, the first to third stirring blades 4a to 4c, the digging blade 3, and the co-rotation prevention blade 22 have a larger relationship in this order. If the radial distance is in this relationship, the opening S1 formed between the inner wall 70 of the excavation hole (see FIGS. 3 and 4) and each of the first connecting member 23 and the second connecting member 24, The opening area of S2 tends to become large. In other words, it is possible to easily realize openings S1 and S2 having relatively large opening areas through which debris can pass.

Hereinafter, further details of the first connecting member 23 and the second connecting member 24 of this embodiment, which constitute the wing reinforcing member, will be explained.

As shown in FIG. 3, the first connecting member 23 of the present embodiment includes a curved portion 23a extending in the circumferential direction C around the shaft portion 2, and an end portion of the curved portion 23a on one side in the circumferential direction C. A first mounting portion 23b that is provided continuously to the curved portion 23a and extends in the radial direction B, and a second mounting portion 23b that is provided continuously to the other end of the curved portion 23a in the circumferential direction C and extends in the radial direction B. A mounting portion 23c is provided.

The curved portion 23a is constituted by an arc-shaped plate portion extending in the circumferential direction C, and extends between the first wing portions 22a of the co-rotation prevention wings 22 adjacent in the circumferential direction C. Further, the curved portion 23a is arranged at a position spaced outward from the shaft portion 2 and the cylinder portion 21 in the radial direction B.

The first attachment part 23b is arranged along the first wing part 22a of one of the co-rotation prevention blades 22 adjacent in the circumferential direction C, and is fastened by a fastening member 60 such as a bolt and a nut. It is fastened to the first wing portion 22a of the one co-rotation prevention wing 22. Further, the second attachment portion 23c is disposed along the first wing portion 22a of the other co-rotation prevention blade 22 of the co-rotation prevention blades 22 adjacent in the circumferential direction C, and is provided with a fastening member 60 such as a bolt and a nut. Thus, it is fastened to the first wing portion 22a of the other co-rotation prevention wing 22.

Note that the first through hole X is formed at a position inside the curved portion 23a in the radial direction B. More specifically, a gap exists between the curved part 23a and the shaft part 2 in the radial direction B, and the first through hole X is formed by this gap. Further, in the first connecting member 23 of this embodiment, the above-mentioned curved portion 23a, first attachment portion 23b, and second attachment portion 23c are joined by welding and are integrated, but bolts, nuts, etc. It may be fastened by a fastening member.

Further, the first connecting member 23 of this embodiment further includes a protruding portion 23d that is continuous with the curved portion 23a and projects in the radial direction B from the curved portion 23a. By providing such a protruding portion 23d, it becomes possible to further enhance the earth retaining effect of the first connecting member 23. The protruding portion 23d of this embodiment protrudes outward and inward in the radial direction B from the curved portion 23a, but depending on the desired earth-retaining effect, the protruding portion 23d may protrude only on either the outer or inner side in the radial direction B. Good too. Further, although four protrusions 23d are provided at intervals in the circumferential direction C in this embodiment, the number may be three or less, or five or more depending on the desired earth retaining effect. It is also possible to do this. Therefore, it is also possible to have a configuration in which the protruding portion 23d is not provided at all. Moreover, although the protruding part 23d of this embodiment is joined to the curved part 23a by welding and is integrated, it may be fastened to the curved part 23a with a fastening member such as a bolt and a nut.

As shown in FIG. 4, the second connecting member 24 of this embodiment includes a curved portion 24a extending in the circumferential direction C around the shaft portion 2, and an end portion of the curved portion 24a on one side in the circumferential direction C. A first mounting portion 24b that is provided continuously to the curved portion 24a and extends in the radial direction B, and a second mounting portion 24b that is provided continuously to the other end of the curved portion 24a in the circumferential direction C and extends in the radial direction B. A mounting portion 24c is provided.

The curved portion 24a is constituted by an arc-shaped plate portion extending in the circumferential direction C, and extends between the third wing portions 22c of the co-rotation prevention wings 22 adjacent in the circumferential direction C. Further, the curved portion 24a is arranged at a position spaced outward from the shaft portion 2 in the radial direction B.

The first attachment part 24b is arranged along the third wing part 22c of one of the co-rotation prevention blades 22 adjacent in the circumferential direction C, and is fastened by a fastening member 60 such as a bolt and a nut. It is fastened to the third wing portion 22c of the one co-rotation prevention wing 22. Further, the second attachment part 24c is arranged along the third wing part 22c of the other co-rotation prevention blade 22 of the co-rotation prevention blades 22 adjacent in the circumferential direction C, and is provided with a fastening member 60 such as a bolt and a nut. Thus, it is fastened to the third wing portion 22c of the other co-rotation prevention wing 22.

Note that the second through hole Y is formed at a position inside the curved portion 24a in the radial direction B. More specifically, a gap exists between the curved portion 24a and the shaft portion 2 in the radial direction B, and the second through hole Y is configured by this gap. Further, in the second connecting member 24 of this embodiment, the above-mentioned curved portion 24a, first attachment portion 24b, and second attachment portion 24c are joined by welding and are integrated, but bolts, nuts, etc. It may be fastened by a fastening member.

Also, in the second connecting member 24 of this embodiment, a protruding portion that is continuous with the curved portion 24a and projects in the radial direction B from the curved portion 24a is provided, similar to the protruding portion 23d of the first connecting member 23 described above. Good too.

Here, in this embodiment, so as to fit into two gaps formed in the circumferential direction C by the first wing portions 22a of the two co-rotation prevention wings 22 arranged at equal intervals in the circumferential direction C, Although two first connecting members 23 are arranged, as described above, the number of co-rotation prevention blades 22 arranged in the circumferential direction C is not limited to two, so the number of first connecting members 23 is This can also be changed as appropriate depending on the number of co-rotation prevention blades 22 in the circumferential direction C.

The same applies to the second connecting member 24. That is, in the present embodiment, the two blades are fitted into two gaps formed in the circumferential direction C by the third wing portions 22c of the two co-rotation prevention wings 22 arranged at equal intervals in the circumferential direction C. Although two second connecting members 24 are arranged, the second connecting members 24 can also be changed as appropriate depending on the number of co-rotation prevention blades 22 in the circumferential direction C.

Furthermore, although the first connecting member 23 of this embodiment includes a curved portion 23a extending in the circumferential direction C, the curved portion 23a may be replaced with a configuration in which it extends linearly or a configuration in which it has a corner portion. The same applies to the curved portion 24a of the second connecting member 24. However, by using a connecting member having a curved portion as in this embodiment, variations in reinforcement strength in the circumferential direction C can be further reduced. Furthermore, variations in the earth retaining effect in the circumferential direction C can also be suppressed. Therefore, it is preferable that at least one of the first connecting member 23 and the second connecting member 24 has a curved portion. A configuration in which both have curved portions 23a, 24a is particularly preferred.

As shown in FIGS. 1 and 2, in the axial direction A, there is another part of the stirring device 1 between the first blade portion 22a of the co-rotation prevention blade 22 and the first stirring blade 4a. The first blade portion 22a and the first stirring blade 4a are arranged with a predetermined gap in the axial direction A without intervening. Further, as shown in FIGS. 1 and 2, in the axial direction A, there is another part of the stirring device 1 between the first blade portion 22a of the co-rotation prevention blade 22 and the second stirring blade 4b. The first blade portion 22a and the second stirring blade 4b are arranged with a predetermined gap in the axial direction A without intervening. Furthermore, as shown in FIGS. 1 and 2, in the axial direction A, there is another part of the stirring device 1 between the third blade portion 22c of the co-rotation prevention blade 22 and the second stirring blade 4b. The third blade portion 22c and the second stirring blade 4b are arranged with a predetermined gap in the axial direction A without intervening. Furthermore, as shown in FIGS. 1 and 2, in the axial direction A, another part of the stirring device 1 is interposed between the third blade portion 22c of the co-rotation prevention blade 22 and the excavation blade 3. Instead, the third wing portion 22c and the excavation wing 3 are arranged with a predetermined gap in the axial direction A. Further, as shown in FIGS. 1 and 2, in the axial direction A, no other part of the stirring device 1 is interposed between the first stirring blade 4a and the third stirring blade 4c, and the first stirring blade 4a and the third stirring blade 4c are arranged with a predetermined gap in the axial direction A.

Hereinafter, the characteristic parts of the stirring device 1 will be explained in detail.

As described above, the stirring blades 4 of the stirring device 1 rotate together with the rotation of the shaft portion 2. On the other hand, the co-rotation prevention portion 5 of the stirring device 1 does not co-rotate with the shaft portion 2 any more than the stirring blade 4 does. Therefore, a shearing force in a direction perpendicular to the axial direction A is applied to the improved soil during excavation by the stirring device 1 by the stirring blades 4 and the co-rotation prevention part 5. This shearing force fragments the soil clods in the improved soil.

Further, as shown in FIG. 2, a part of the co-rotation prevention part 5 (in this embodiment, the first blade part 22a and the first connecting member 23) is arranged in the axial direction of the shaft part 2 with respect to the first stirring blade 4a. It is arranged on the tip side of A with a gap in between. Therefore, a part of the soil clod that has been subdivided by the shearing force in the direction perpendicular to the axial direction A described above is separated from the first stirring blade 4a and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first blade 22a and the first connecting member 23).

Furthermore, as shown in FIG. 2, in the lower surface 10b located on the tip side in the axial direction A of the first stirring blade 4a, one end 10b1 of the rotation direction C1 during excavation work in the circumferential direction C is It is closer to the base end of the shaft portion 2 than the other end 10b2 in the direction C2 opposite to the rotational direction C1. With such a configuration, during excavation work, the first stirring blade 4a and the co-rotation prevention part 5, which is arranged with a gap on the tip side in the axial direction A with respect to the first stirring blade 4a, (in the present embodiment, the first blade portion 22a and the first connecting member 23), the soil mass located in the gap between the soil mass and the first stirring blade 4a is rotated in the direction of rotation during excavation work, relative to the first stirring blade 4a. It is easy to move in the direction C2 opposite to C1. In other words, the soil clod located in the gap between the first stirring blade 4a and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first blade part 22a and the first connecting member 23) is removed from the first stirring blade. 4a and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first wing part 22a and the first connecting member 23) are easily guided from a place where the distance in the axial direction A is large to a place where it is small. As a result, during excavation work, the soil clot located in the gap between the first stirring blade 4a and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first blade part 22a and the first connecting member 23) can be pressed toward a part of the co-rotation prevention part 5 (in this embodiment, the first wing part 22a and the first connecting member 23). As a result, the soil clod located in the gap between the first stirring blade 4a and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first wing part 22a and the first connecting member 23) is prevented from co-rotation. It can be rubbed against the part 5 side, and the soil clod can be further divided into smaller pieces. In addition, it is possible to improve the stirring performance when mixing the soil solidification material with the excavated soil. Hereinafter, for convenience of explanation, the above-mentioned action and effect may be simply referred to as "pesting effect."

In addition, in the lower surface 10b of the first stirring blade 4a, one end 10b1 of the rotation direction C1 may be closer to the base end of the shaft portion 2 than the other end 10b2 of the opposite direction C2, and the above-mentioned one end of the lower surface 10b The surface shape of the portion between 10b1 and the other end 10b2 is not particularly limited. However, from the viewpoint of enhancing the above-mentioned rubbing effect, a groove is provided between the one end 10b1 and the other end 10b2 of the lower surface 10b with respect to the circumferential direction C so as to approach the base end of the shaft portion 2 as it goes in the rotational direction C1. Preferably, there is a sloped lower surface portion that is sloped. The inclined lower surface portion may be flat or curved.

In particular, in this embodiment, as shown in FIG. 2, the lower surface 10b located on the tip side in the axial direction A of the first stirring blade 4a has a shank portion as it goes in the rotational direction C1 during excavation work in the circumferential direction C. It is inclined with respect to the circumferential direction C so as to approach the base end of No. 2. In other words, the lower surface 10b of this embodiment is comprised only of the above-mentioned inclined lower surface portion. If the lower surface 10b of the first stirring blade 4a is configured to be inclined in this way, a gap is created between the first stirring blade 4a and the tip side in the axial direction A with respect to the first stirring blade 4a during excavation work. The soil clod located in the gap between a part of the co-rotation prevention part 5 (in this embodiment, the first wing part 22a and the first connecting member 23), which are arranged apart from each other, is transferred to the first stirring blade 4a. On the other hand, it becomes relatively easier to move in the direction C2 opposite to the rotational direction C1 during excavation work. Thereby, the above-mentioned rubbing effect can be further enhanced.

In addition, in the co-rotation prevention part 5 of the present embodiment, a part of the co-rotation prevention blade 22 arranged at a predetermined interval on the tip side in the axial direction A with respect to the first stirring blade 4 a Although the wing portion 22a and the first connecting member 23 have been used, the configuration is not limited to this. Therefore, another part of the co-rotation prevention part 5 may be arranged on the tip side in the axial direction A with respect to the first stirring blade 4a at a predetermined interval. Furthermore, in the co-rotation prevention part 5 of this embodiment, only a part (the first blade part 22a and the first connecting member 23) is spaced at a predetermined distance from the tip side in the axial direction A with respect to the first stirring blade 4a. In this configuration, all of the co-rotation prevention portions may be placed at the above positions.

In this embodiment, the first stirring blade 4a is formed in a plate shape, and the above-mentioned inclined lower surface 10b is realized by so-called "reverse mounting" of the first stirring blade 4a. It is not limited to the plate-shaped first stirring blade 4a as long as the inclined lower surface 10b can be realized.

Moreover, the co-rotation prevention part 5 of this embodiment has the 1st through-hole X which penetrates in the axial direction A of the shaft part 2, as mentioned above. Specifically, the first wing portion 22a and the first connecting member 23 of the co-rotation prevention portion 5 of this embodiment have a first through hole X that penetrates in the axial direction A of the shaft portion 2. The first stirring blade 4a is configured to be rotatable relative to the co-rotation prevention part 5 at a position on the base end side in the axial direction A with respect to the first through hole X of the co-rotation prevention part 5. has been done. With such a configuration, the first stirring blade 4a and a part of the co-rotation prevention part 5 in which the first through hole X is formed (in this embodiment, the first blade part 22a and the first connecting member 23) By rubbing the soil clod located in the gap between and against the edge of the first through hole X of the co-rotation prevention part 5, the above-mentioned rubbing effect can be enhanced and the soil clod can be further divided into smaller pieces. Can be done. In addition, during the excavation work, the soil clod is moved between the first stirring blade 4a and a part of the co-rotation prevention part 5 in which the first through hole X is formed (in this embodiment, the first blade part 22a and the first connecting member 23) can be efficiently supplied through the first through hole X, and the probability of obtaining a pestle effect can be increased. Furthermore, by providing the first through-hole X in the co-rotation prevention part 5, the improved soil enters the first through-hole X, so that the soil retaining effect of the co-rotation prevention part 5 can be enhanced. Therefore, it is possible to increase the shearing force that acts on the improved soil between the first stirring blade 4a and the co-rotation prevention part 5, and it is possible to more reliably break up the clod of excavated soil contained in the improved soil, and also to Stirring performance when mixing solidifying materials can be improved.

Further, as shown in FIG. 2, the stirring device 1 of this embodiment rotates together with the shaft portion 2, and is attached to the co-rotation prevention portion 5 at a position on the tip side in the axial direction A with respect to the first through hole X. A plate-shaped second stirring blade 4b is provided which is rotatable relative to the stirring blade. The second stirring blade 4b is inclined toward the tip of the shaft portion 2 as it goes in the rotation direction C1, that is, the second stirring blade 4b is so-called "correctly attached." By providing such a second stirring blade 4b, the first stirring blade 4a and a part of the co-rotation prevention part 5 in which the first through hole X is formed (in this embodiment, the first blade part 22a and the 1 connection member 23), as well as the second stirring blade 4b and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first blade part 22a and the first connection The above-mentioned rubbing effect can also be obtained for the earth clod located in the gap between the member 23). In addition, since the plate-shaped second stirring blade 4b is so-called "correctly attached", during excavation work, it scoops up the improved soil including the soil clods of the excavated soil and pushes it up toward the base end side in the axial direction A, so that the improved soil including the soil clods is scooped up and pushed up toward the base end side in the axial direction A. The improved soil can be supplied toward the first through hole X of the co-rotation prevention part 5. This allows the soil clod to be moved between the second stirring blade 4b and a part of the co-rotation prevention part 5 (in this embodiment, the first blade part 22a and the first connecting member 23) in which the first through hole X is formed. In addition to being able to efficiently supply the soil clod to the gap between and the first connecting member 23).

Furthermore, as shown in FIG. 2, in the present embodiment, in the axial direction A, the shortest distance L1 between the first stirring blade 4a and the first through hole X is equal to the distance between the second stirring blade 4b and the first through hole X. It is shorter than the shortest distance L2. The shortest distance L1 in the axial direction A between the first stirring blade 4a and the first through hole This is the distance in direction A. Further, the shortest distance L2 in the axial direction A between the second stirring blade 4b and the first through hole X is from the end of the second stirring blade 4b on the opposite direction C2 side to the rotation direction C1 to the first through hole is the distance in the axial direction A. By shortening the shortest distance L1 about the first stirring blade 4a, the first stirring blade 4a and a part of the co-rotation prevention part 5 in which the first through hole X is formed (in this embodiment, the first blade part 22a and the first connecting member 23), the soil clod can be made smaller by the above-mentioned pestle effect. On the other hand, by increasing the shortest distance L2 for the second stirring blade 4b, the second stirring blade 4b and a part of the above-mentioned co-rotation prevention part 5 (in this embodiment, the first blade part 22a and the first It is possible to prevent debris from remaining between the connecting member 23) and the stirring performance from being reduced. From the above, as in the present embodiment, in the axial direction A, the shortest distance L1 between the first stirring blade 4a and the first through hole X is the shortest distance L1 between the second stirring blade 4b and the first through hole X. It is preferably shorter than L2. Note that the shortest distances L1 and L2 are preferably 10 mm to 70 mm. If it is smaller than 10 mm, it will be difficult for the clod to enter the gap, but once it has entered the gap, the clod may get stuck in the gap. If it is larger than 70 mm, the entire clod will be reduced to the desired size (10 mm or less). This is because it may not be possible to completely subdivide the information.

The above-described first stirring blade 4a, second stirring blade 4b, and first through hole X of the co-rotation prevention part 5 are not limited to the specific configuration shown in this embodiment. For example, as described above, the co-rotation prevention unit 5 of the present embodiment includes a plurality of co-rotation prevention blades 22 and a first connecting member 23 that connects the co-rotation prevention blades 22 at the first position P1 in the axial direction A. The first through hole X of this embodiment is formed at a first position P1 in the axial direction A between the first connecting member 23 and the shaft portion 2. The configuration of the co-rotation prevention portion 5 and the first through hole X is not limited to this.

However, as in the present embodiment, from the base end side to the distal end side in the axial direction A, the first stirring blade 4a, the first through hole X of the co-rotation prevention part 5, the second stirring blade 4b, and the co-rotation prevention part. It is preferable that the second through holes Y of the portion 5 are arranged in this order. In this way, the gap between the second stirring blade 4b and the second through hole Y of the co-rotation prevention part 5 and its vicinity (in this embodiment, the third blade part 22c and the second connecting member 24) Also, a predetermined soil retaining effect can be obtained by the second through hole Y, and the performance of dividing the soil clod can be improved, and the performance of stirring the excavated soil and the ground solidification material can be improved. Note that both the first through hole X and the second through hole Y of this embodiment are formed in the co-rotation prevention portion 5 extending from the first position P1 to the second position P2 in the axial direction A. , separate co-rotation prevention parts may be provided at each of the first position P1 and the second position P2 in the axial direction A, and the first through hole and the second through hole may be formed in each of the separate co-rotation prevention parts.

Furthermore, as shown in FIG. Even in the gap, a predetermined soil retaining effect can be obtained by the second through hole Y, and the performance of dividing the soil mass into small pieces can be improved, as well as the performance of stirring the excavated soil and the ground solidification material.

Furthermore, in the stirring device 1 of the present embodiment, the stirring blade 4a is located on the base end side in the axial direction A with respect to the first stirring blade 4a, and is arranged with a predetermined gap from the first stirring blade 4a in the axial direction A. A plate-shaped third stirring blade 4c is provided. As described above, the plate-shaped third stirring blade 4c of this embodiment is inclined so as to approach the tip of the shaft portion 2 as it goes in the rotation direction C1. As described above, the lower surface 10b of the first stirring blade 4a of this embodiment is inclined so as to approach the base end of the shaft portion 2 as it goes in the rotation direction C1. Therefore, as the lower surface of the first agitating blade moves toward the rotation direction C1, the torque resistance during excavation work increases compared to a configuration in which the lower surface of the first stirring blade is inclined toward the tip of the shaft portion 2. However, by sandwiching the first stirring blade 4a between the plate-shaped second stirring blade 4b and third stirring blade 4c, which are so-called "correctly attached", the torque resistance during excavation work by the first stirring blade 4a can be reduced. Excessive increase can be suppressed.

Note that each part of the stirring device 1 can be made of high strength, high wear-resistant steel or metal materials.

As described above, according to the stirring device 1 of the present embodiment, the performance of dividing the soil clod into small pieces can be improved by the above-mentioned rubbing effect during excavation work. As a result, the stirring performance of excavated soil and ground solidification material can be improved.

The stirring device according to the present invention is not limited to the specific configuration shown in the above-described embodiments, and various modifications and changes can be made without departing from the gist of the invention described in the claims. . For example, all of the plate-shaped first stirring blades 4a of the above-mentioned embodiment have a so-called "inverted" configuration, but if at least one first stirring blade has a so-called "inverted" configuration, good. However, if all the first stirring blades 4a are configured in a so-called "reversely mounted" configuration as in the above-mentioned embodiment, compared to a configuration in which only some of the first stirring blades are so-called "reversely mounted". As a result, the above-mentioned pestle effect can be enhanced, and the performance of dividing the soil clod into smaller pieces can be further improved. Further, for example, in the lower surface 10b of the first stirring blade 4a, one end 10b1 in the rotation direction C1 may be closer to the base end of the shaft portion 2 than the other end 10b2 in the opposite direction C2, and the lower surface 10b may be It may include an inclined lower surface portion that is inclined with respect to the direction C, and a parallel lower surface portion that is parallel to the circumferential direction C.

The present invention relates to a stirring device.

1: Stirring device 2: Shaft part 2a: Opening 3: Excavation blade 3a: Excavation claw 4: Stirring blade 4a: First stirring blade 4b: Second stirring blade 4c: Third stirring blade 5: Co-rotation prevention part 10a: No. Upper surface 10b of the first stirring blade: Lower surface 10b1 of the first stirring blade: One end of the lower surface 10b2: Other end of the lower surface 10c: Upper end surface 10d of the first stirring blade: Lower end surface 11a of the first stirring blade: of the second stirring blade Upper surface 11b: Lower surface 11c of the second stirring blade: Upper end surface 11d of the second stirring blade: Lower end surface 12a of the second stirring blade: Upper surface 12b of the third stirring blade: Lower surface 12c of the third stirring blade: Third stirring blade Upper end surface 12d: Lower end surface 21 of third stirring blade: Cylindrical portion 22: Co-rotation prevention blade 22a: First blade portion 22b: Second blade portion 22c: Third blade portion 23: First connecting member 23a: First 1 curved part 23b of the connecting member: 1st attachment part 23c of the 1st connection member: 2nd attachment part 23d of the 1st connection member: Projection part 24: 2nd connection member 24a: Curved part 24b of the 2nd connection member: 1st First attachment part 24c of two connecting members: Second attachment part 30a of second connecting member: First stirring blade group 30b: Second stirring blade group 30c: Third stirring blade group 50: Backflow prevention valve 60: Fastening member 70 : Inner wall of the excavation hole A: Axial direction of the shaft B: Radial direction of the shaft C: Circumferential direction of the shaft C1: Circumferential direction of the shaft during excavation work C2: Circumferential direction of the shaft Direction opposite to the rotational direction during excavation work L1: Shortest axial distance between the first stirring blade and the first through hole L2: Shortest axial distance between the second stirring blade and the first through hole O: The shortest distance in the axial direction between the second stirring blade and the first through hole O: Central axis P1: First axial position P2: Second axial position S1: Opening S2 formed radially outward with respect to the first connecting member: radially outward with respect to the second connecting member Opening X: First through hole Y: Second through hole

Claims (12)

a cylindrical shaft;
a stirring blade that rotates together with the shaft portion;
a co-rotation prevention part that is attached to be rotatable relative to the shaft part, and at least a part of which is disposed on the tip side in the axial direction of the shaft part with respect to the stirring blade with a gap therebetween; and,
On the lower surface of the stirring blade located on the tip side in the axial direction, one end in the circumferential direction of the shaft portion in the direction of rotation during excavation work is smaller than the other end in the circumferential direction in the opposite direction to the rotational direction. , a stirring device characterized in that the stirring device is close to the base end of the shaft portion. The stirring device according to claim 1, wherein the lower surface is inclined with respect to the circumferential direction so as to approach the base end of the shaft portion as it goes in the rotation direction during excavation work. The co-rotation prevention part has a through hole penetrating in the axial direction,
According to claim 1 or 2, the stirring blade is rotatable relative to the co-rotation prevention part at a position on the base end side in the axial direction with respect to the through hole. The stirring device described. When the stirring blade is a first stirring blade, it rotates together with the shaft portion and rotates relative to the co-rotation prevention portion at a position on the tip side in the axial direction with respect to the through hole. Equipped with a possible plate-shaped second stirring blade,
The stirring device according to claim 3, wherein the second stirring blade is inclined so as to approach the tip of the shaft portion as it goes in the rotation direction. The stirring device according to claim 4, wherein in the axial direction, the shortest distance between the first stirring blade and the through hole is shorter than the shortest distance between the second stirring blade and the through hole. . The co-rotation prevention portion includes a plurality of co-rotation prevention blades that protrude toward the outside in the radial direction of the shaft portion, and a first position between the first stirring blade and the second stirring blade in the axial direction. and a connecting member that connects the co-rotation prevention blades adjacent in the circumferential direction,
The stirring device according to claim 4 or 5, wherein the through hole is formed at a position between the connecting member and the shaft portion at the first position in the axial direction. Each of the plurality of co-rotation prevention blades includes a first blade portion extending in the radial direction at the first position in the axial direction, and a first blade portion continuous with the first blade portion toward the tip side in the axial direction. an extending second wing section that is continuous with the second wing section and extends inward in the radial direction at a second position closer to the tip side in the axial direction than the second stirring blade; a third wing portion whose portion is not attached to the shaft portion;
When the connecting member is a first connecting member, the first connecting member connects adjacent first wing portions in the circumferential direction at the first position,
7. The stirring device according to claim 6, further comprising a second connecting member that connects adjacent third wing portions in the circumferential direction at the second position in the axial direction. When the through hole is a first through hole, a second through hole penetrating in the axial direction is located between the second connecting member and the shaft portion at the second position in the axial direction. 8. The stirring device according to claim 7, characterized in that: is formed. The stirring device according to claim 8, wherein at least one of the first connecting member and the second connecting member includes a curved portion extending in the circumferential direction around the shaft portion. . The stirring device according to claim 9, wherein the at least one connecting member further includes a protrusion that is continuous with the curved portion and projects from the curved portion in the radial direction. a plate-shaped third stirring blade disposed on the proximal end side in the axial direction with respect to the first stirring blade, with a gap therebetween;
The stirring device according to any one of claims 4 to 10, wherein the third stirring blade is inclined so as to approach the tip of the shaft portion as it goes in the rotation direction. The stirring device according to any one of claims 1 to 11, further comprising a digging blade provided at the tip of the shaft portion.

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