JP2976176B2 - Stirrer in ground improvement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer in a ground improvement apparatus such as a soft ground improvement machine for mixing a hardening agent such as ready-mixed concrete or slurry cement into a soft ground such as a landfill. And related technologies.

[0002]

2. Description of the Related Art A soft ground improvement machine of this kind is equipped with a stirrer for mixing a soil hardening agent into soft ground while stirring it at the front of a self-propelled lower body having a float with a crawler belt. An upper vehicle body is installed on a vehicle body, and a driver's cab, a prime mover, and the like are mounted on the upper vehicle body (see Japanese Utility Model Publication No. 5-12348).

Conventionally, the agitating device has a plurality of agitating blades directly attached to a drive shaft or a double-shaft structure, in which agitating blades are attached to each shaft, and each shaft is separately driven. Then, there is a type in which each agitating blade rotates in the reverse direction when each shaft is rotated in the reverse direction. Further, another blade is fitted to the drive shaft adjacent to the drive blade rotating integrally with the drive shaft, and the diameter of the drive blade is larger than the rotation diameter of the drive blade rotating integrally with the drive shaft. There is what was formed in.

[0004] In this apparatus, a blade fitted to a drive shaft is locked at an unimproved portion to become a fixed blade, and a stirring function is performed by changing a relative position between the drive blade and the fixed blade. It is.

[0005]

However, such conventional stirring devices have the following problems. That is, in the case where a plurality of stirring blades are directly attached to the drive shaft, since the whole rotates in a fixed shape,
The viscous soil or the like hardens the periphery of the stirring blade into a dumpling shape, making stirring and mixing impossible.

In the case where the shaft has a double structure,
The whole device becomes large, for example, the shaft diameter becomes large. Furthermore, if the stirring function is performed by changing the relative positions of the driving blades and the fixed blades, the number of cuts of the ground by the blades is small, and high stirring mixing properties cannot be expected much.

[0007] In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to improve the stirring and mixing performance and to reduce the size of the stirring device in the ground improvement device.

[0008]

SUMMARY OF THE INVENTION Therefore, the invention according to claim 1 is a ground improvement device, which is a stirrer for mixing a soil treating agent into the ground while stirring the same, wherein a drive shaft and a drive shaft are provided. A first rotary stirring blade provided at the tip,
A first gear provided on an upper surface of the first rotary stirring blade of the drive shaft, and rotatably fitted to an outer peripheral portion of the drive shaft so as to be concentric with the drive shaft; A hollow pipe, a fixed blade provided at an end of the hollow pipe opposite to the first rotary stirring blade, and longer than the first rotary stirring blade, and a position near the first gear of the hollow pipe. And a second gear meshing with the first gear about an axis orthogonal to the axis of the drive shaft, and an outer peripheral portion of the hollow pipe near the second gear, which rotates concentrically with the hollow pipe. A second rotary stirring blade inserted as possible,
And a third gear provided on the lower surface of the second rotary stirring blade and centering on the axis of the drive shaft and meshing with the second gear.

According to a second aspect of the present invention, the second rotary stirring blade is formed in a shape having a larger area in the rotation axis direction than the first rotary stirring blade and the fixed blade.
According to a third aspect of the present invention, the number of the second rotary stirring blades is greater than the number of the first rotary stirring blades.

According to a fourth aspect of the present invention, the second rotary stirring blade is formed in a continuous or partially discontinuous ring shape on a circumference having the same diameter as the first rotary stirring blade. According to a fifth aspect of the present invention, instead of the fixed blade, a blade provided with a plate member perpendicular to the plate surface is provided.

According to a sixth aspect of the present invention, a friction plate is provided in place of the fixed blade.

[0012]

According to the first aspect of the present invention, when the stirrer is pushed into the ground and the drive shaft is rotated, the first rotary stirring blade at the tip of the drive shaft is rotated, and the device entrance is softened. And the portion around the improved portion becomes an unimproved portion having a supporting force. With respect to the rotation of the drive shaft, the fixed blade formed longer than the first rotary stirring blade is fixed at the non-improved portion having a supporting force on the outer peripheral side of the soft improved portion. For this reason, the hollow pipe provided with the fixed blade is also fixed to the drive shaft.

[0013] By fixing the hollow pipe to the drive shaft in this manner, the second pipe provided in the hollow pipe is provided.
Is fixed in its position, and is rotated in mesh with the first gear rotating with the drive shaft. By the rotation of the second gear, the third gear meshing with the second gear is rotated, and the second rotary stirring blade is rotated integrally therewith. The rotation direction of the second rotary stirring blade is opposite to that of the first rotary stirring blade.

As described above, when the drive shaft rotates, the fixed blade is fixed at the unimproved portion having a supporting force on the outer peripheral side of the soft improved portion, and the first pipe is fixed by fixing the hollow pipe.
The second rotary stirring blade rotates in the direction opposite to that of the second rotary stirring blade. And, in this way, by the rotation of the first rotary stirring blade and the reverse rotation of the second rotary stirring blade,
The stirring and mixing can be performed effectively, and it is possible to prevent the surroundings of the stirring blade from hardening into a dumpling shape by viscous soil or the like, so that the stirring and mixing can be continuously performed.

[0015] In addition, compared with the conventional one in which the relative position between the driving blade and the fixed blade is changed, the number of cuts of the ground by the blade is large, and high stirring and mixing properties can be expected. Furthermore, since the drive shaft can be constituted by a single shaft, the structure can be simplified and the device can be downsized.

According to the second to fourth aspects of the present invention, higher stirring and mixing properties are exhibited. According to the fifth aspect of the present invention, the plate member provided at right angles to the plate surface of the blade functions as a detent, and the blade is fixed. In the invention according to claim 6, the friction plate is fixed by a frictional force with the ground.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, one embodiment of a stirrer in a ground improvement apparatus such as a soft ground improvement machine that mixes a hardening agent such as ready-mixed concrete or slurry cement into soft ground such as a landfill (an embodiment of the invention according to claim 1) ) Is shown.

That is, in the figure, a stirring device 1 includes a driving shaft 2 driven by a driving device such as a motor (not shown),
The first rotary stirring blade 3, the first gear 4, the hollow pipe 5, the fixed blade 6, the second gear 7, the second rotary stirring blade 8, and the third gear 9 Be composed. The first
The rotary stirring blade 3 is provided at the tip of the drive shaft 2 so as to protrude in a plane perpendicular to the axis.

The first gear 4 is a gear centered on the axis of the drive shaft 2, and the first rotary stirring blade 3 of the drive shaft 2
It is provided on the upper surface. The hollow pipe 5 includes a drive shaft 2
The first gear 4 is rotatably fitted to the outer peripheral portion thereof above the first gear 4 so as to be concentric with the drive shaft 2. The fixed blade 6 is an end of the hollow pipe 5 opposite to the first rotary stirring blade 3, that is,
It is provided at the upper end. Also, the fixed blade 6 is
Is formed longer than the rotary stirring blade 3.

The second gear 7 is a gear centered on an axis orthogonal to the axis of the drive shaft 2, and is provided at a position near the first gear 4 of the hollow pipe 5. Are engaged. The second rotary stirring blade 8 is provided on an outer peripheral portion of the hollow pipe 5 near the second gear 7.
It is inserted concentrically and rotatably.

The third gear 9 is a gear centered on the axis of the drive shaft 2, is provided on the lower surface of the second rotary stirring blade 8, and meshes with the second gear 7. . A ring member 10 for preventing the hollow pipe 5 from shifting upward is attached to an outer peripheral surface of the drive shaft 2 near the fixed blade 6, and a second rotary stirring blade 8 of the hollow pipe 5 is provided. A ring member 11 for preventing the second rotary stirring blade 8 from shifting upward is attached to the vicinity of the outer peripheral surface.

Reference numeral 12 is a cutting bit, and 13 is a slurry nozzle. Next, the operation of the stirring device 1 will be described. When the stirrer 1 is pushed into the ground and the drive shaft 2 is rotated, the first rotary stirring blade 3 at the tip of the drive shaft 2 is rotated, and the portion A in the figure of the device entry portion becomes a soft improved portion, A portion B in the figure around the improved portion A is an unimproved portion having a supporting force.

With respect to the rotation of the drive shaft 2, the fixed blade 6 formed longer than the first rotary stirring blade 3 is a soft improvement part A.
Is fixed at the unimproved portion B having a supporting force on the outer peripheral side of the outer peripheral side. For this reason, the hollow pipe 5 provided with the fixed fixed blades 6 is provided.
Is also fixed to the drive shaft 2. By fixing the hollow pipe 5 to the drive shaft 2 in this manner, the position of the second gear 7 provided on the hollow pipe 5 is fixed, and the first gear 4 And it is rotated. By the rotation of the second gear 7, the third gear 8 meshing with the second gear 7 is rotated, and the second rotary stirring blade 9 is rotated integrally therewith. This second rotary stirring blade 9
Is in a direction opposite to that of the first rotary stirring blade 3.

As described above, with respect to the rotation of the drive shaft 2,
The fixed blade 6 is fixed at the non-improved portion B having a supporting force on the outer peripheral side of the soft improved portion A, and the hollow pipe 5 is fixed, so that the second rotation in the opposite direction to the first rotary stirring blade 3 is performed. The stirring blade 8 rotates. Thus, the rotation of the first rotary stirring blade 3 and the reverse rotation of the second rotary stirring blade 8 can effectively perform the stirring and mixing. Since it is possible to prevent the solidification in the form of a dumpling, stirring and mixing can be continuously performed.

In addition, the number of cuts of the ground by the rotary stirring blades 3 and 8 is larger than that of the conventional one that performs the stirring function due to the change in the relative position between the driving blade and the fixed blade, and the high stirring and mixing property. Can be expected. Further, since the drive shaft 2 can be constituted by a single shaft, the structure can be simplified and the size of the apparatus can be reduced.

The second rotary stirring blade 8 is formed in a shape having a larger area in the direction of the rotation axis than the first rotary stirring blade 3 and the fixed blade 6, or By forming the number of blades larger than the number of blades of the first rotary stirring blade 3, or alternatively, by forming the first rotary stirring blade 3
It is preferable to form a continuous or partially discontinuous ring on the circumference having the same diameter as that described above, since higher stirring and mixing properties can be obtained (the inventions of claims 2 to 4).

In the above embodiment, the fixed blade 6
Is formed longer than the first rotary stirring blade 3 and is fixed by the unimproved portion B having a supporting force on the outer peripheral side of the soft improved portion A. However, as shown in FIG. The plate member 16A is provided at right angles to the plate surface of the blade 16 having the same length as the rotary stirring blade 3 of the above, and the plate member 16A functions as a detent,
The blade 16 may be fixed (the invention according to claim 5).

Alternatively, instead of the fixed blade 6, a friction plate fixed by a frictional force with the ground may be provided (the invention according to claim 6).

[0029]

As described above, according to the first aspect of the present invention, the fixed blade is fixed to the non-improved portion having a supporting force on the outer peripheral side of the soft improved portion with respect to the rotation of the drive shaft. When the hollow pipe is fixed, the second rotary stirring blade rotates in a direction opposite to that of the first rotary stirring blade. As a result, the stirring and mixing can be performed effectively, and the viscous soil or the like causes the surrounding of the stirring blade to rotate. Can be prevented from hardening into a dumpling, so that stirring and mixing can be continuously performed, and a change in the relative position between the conventional driving blade and the fixed blade causes a stirring function to be achieved. Since the number of ground cuts by the blades is large, high stirring and mixing properties can be expected, and the drive shaft can be constituted by a single shaft, the structure can be simplified and the device can be downsized.

According to the second to fourth aspects of the present invention, higher stirring and mixing properties can be obtained. According to the fifth aspect of the present invention, the plate member provided at right angles to the plate surface of the blade functions as a detent, can fix the blade, and the second rotary stirring blade in a direction opposite to the first rotary stirring blade. Can be rotated.
In the invention according to claim 6, the friction plate can be fixed by the frictional force with the ground, and the second rotary stirring blade can be rotated in a direction opposite to the first rotary stirring blade.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the invention described in claim 1;

FIG. 2 is a front view showing an embodiment of the invention described in claim 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stirrer 2 drive shaft 3 first rotary stirring blade 4 first gear 5 hollow pipe 6 fixed blade 7 second gear 8 second rotary stirring blade 9 third gear 16 blade 16A plate member

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 3/12

Claims (6)

(57) [Claims] 1. A stirrer for mixing a soil treating agent into a ground while stirring the soil, wherein the drive shaft; a first rotary stirring blade provided at a tip end of the drive shaft; A first gear provided on the upper surface of the first rotary stirring blade of the drive shaft, and rotatably fitted to an outer peripheral portion of the drive shaft rotatably coaxially with the drive shaft; A hollow pipe; a fixed blade provided at an end of the hollow pipe opposite to the first rotary stirring blade, and longer than the first rotary stirring blade; and a position near the first gear of the hollow pipe. Provided,
A second gear meshing with the first gear about an axis perpendicular to the axis of the drive shaft; and a rotatably fitted coaxially with the hollow pipe around an outer peripheral portion of the hollow pipe near the second gear. A second rotary stirring blade to be provided, and a third gear provided on the lower surface of the second rotary stirring blade and centering on the axis of a drive shaft and meshing with the second gear. A stirring device in a ground improvement device, characterized in that: 2. The apparatus according to claim 1, wherein the second rotary stirring blade is formed in a shape having a larger area in a rotation axis direction than the first rotary stirring blade and the fixed blade. A stirring device in the ground improvement device as described in the above. 3. A stirrer according to claim 1, wherein said second rotary stirring blade is formed with a larger number of blades than said first rotary stirring blade. . 4. The apparatus according to claim 1, wherein said second rotary stirring blade is formed in a continuous or partially discontinuous ring shape on a circumference having the same diameter as said first rotary stirring blade. Item 1
A stirring device in the ground improvement device as described in the above. 5. A blade having a plate member provided at right angles to a plate surface in place of said fixed blade.
The stirrer in the ground improvement device according to any one of the above. 6. A stirrer according to claim 1, wherein a friction plate is provided in place of said fixed blade.