JPH08193322A - Agitator in ground improving device - Google Patents

Abstract

PURPOSE: To enhance an agitating and mixing ability of an agitating device and reduce the size of the device in a ground improving device. CONSTITUTION: With regards to the turning of a drive shaft 2, a blade 6 is fixed with an unimproved part B having a support force located outside a weak improved part A so that a second agitating blade 8 may be arranged to turn in the opposite direction to a first agitating blade 3. The turning of the first agitating blade 3 and the reverse turning of the second agitating blade 8 produce agitation and mixing effects, which makes it possible to prevent the surrounding areas around both agitating blades 3 and 8 from being solidified like dumplings and agitate and mix in continuous mode.

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 device such as a soft ground improver in which a hardening agent such as fresh concrete or slurry cement is mixed into soft ground such as landfill, and the stirring performance is improved. Related to technology to achieve such.

[0002]

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

As the agitating device, conventionally, a plurality of agitating blades are directly attached to a drive shaft, or the shaft has a double structure, the agitating blades are attached to each shaft, and each shaft is separately driven. Then, the respective stirring blades are reversely rotated by the reverse rotation of the respective shafts. In addition, a blade that is adjacent to the drive blade that rotates integrally with the drive shaft, has another blade that is inserted into the drive shaft, and that has a diameter larger than the rotation diameter of the drive blade that rotates integrally with the drive shaft. There is one formed in.

In this structure, the blade fitted on the drive shaft is locked at the unmodified portion to become the fixed blade, and the stirring function is achieved by the change in the relative position between the drive blade and the fixed blade. Is.

[0005]

However, each of such conventional stirring devices has the following problems. That is, in the case where a plurality of stirring blades are directly attached to the drive shaft, the whole rotates in a constant shape,
The surroundings of the stirring blades harden into a dumpling due to cohesive soil, making stirring and mixing impossible.

Also, in the case where the shaft has a double structure,
The overall size of the device increases, such as the shaft diameter becoming thicker. Further, in the case where the stirring function is achieved by changing the relative positions of the driving blade and the fixed blade, the number of ground cuts by the blade is small, and high stirring and mixing property cannot be expected so much.

In view of the above conventional problems, it is an object of the present invention to improve the agitation and mixing property and to downsize the agitation device in the ground improvement device.

[0008]

For this reason, the invention according to claim 1 is a ground improvement apparatus, which is a stirring apparatus for mixing a soil treatment agent into the ground while stirring, which comprises a drive shaft and the drive shaft. A first rotary stirring blade provided at the tip,
A first gear that is provided on the upper surface of the first rotary stirring blade of the drive shaft and that is centered around the axis of the drive shaft and is fitted to the outer peripheral portion of the drive shaft so as to be rotatable concentrically with the drive shaft. Hollow pipe, a fixed blade provided at an end of the hollow pipe opposite to the first rotary stirring blade, and a fixed blade longer than the first rotary stirring blade, and a position near the first gear of the hollow pipe. And a second gear that meshes with the first gear around an axis orthogonal to the axis of the drive shaft and an outer peripheral portion of the hollow pipe in the vicinity of the second gear and concentric with the hollow pipe. A second rotary stirring blade that is inserted as much as possible,
And a third gear that is provided on the lower surface of the second rotary stirring blade and that is centered on the axis of the drive shaft and that meshes 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 rotational 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 larger 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 the circumference of the same diameter as the first rotary stirring blade. According to a fifth aspect of the invention, instead of the fixed blade, a blade provided with a plate member at a right angle to the plate surface is provided.

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

[0012]

In the invention according to claim 1, when the stirrer is thrust into the ground and the drive shaft is rotated, the first rotary stirring blade at the tip of the drive shaft rotates and the thruster of the device is weak. Therefore, 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, which is formed longer than the first rotary stirring blade, is fixed by the unmodified portion having a supporting force on the outer peripheral side of the weak modified portion. Therefore, the hollow pipe provided with the fixed blade is also fixed to the drive shaft.

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

As described above, with respect to the rotation of the drive shaft, the fixed blade is fixed at the unmodified portion having a supporting force on the outer peripheral side of the weakened portion, and the hollow pipe is fixed, so that the first
The second rotary stirring blade rotates in the direction opposite to that of the rotary stirring blade. Then, in this way, by the rotation of the first rotary stirring blade and the reverse rotation of the second rotary stirring blade,
Stirring and mixing can be effectively performed, and the surroundings of the stirring blade can be prevented from solidifying in a dumpling-like shape with viscous soil or the like, so that stirring and mixing can be continuously performed.

Further, the number of ground cuts by the blades is large and a high stirring and mixing property can be expected, as compared with a conventional one that has a stirring function by changing the relative positions of the driving blades and the fixed blades. Further, since the drive shaft can be configured by a single shaft, the structure can be simplified and the device can be downsized.

In the inventions according to claims 2 to 4, higher stirring and mixing properties are achieved. In the invention of claim 5, the plate member provided at a right angle to the plate surface of the blade functions as a rotation stop, and the blade is fixed. In the invention of 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 an agitator in a ground improvement device such as a soft ground improvement machine in which a hardening agent such as fresh concrete or slurry cement is mixed into soft ground such as landfill (an embodiment of the invention according to claim 1 ) Is shown.

That is, in the figure, a stirring device 1 includes a drive shaft 2 driven by a drive device such as a motor (not shown),
From 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. Composed. The first
The rotary stirring blade 3 is provided so as to project in the plane perpendicular to the tip of the drive shaft 2.

The first gear 4 is a gear centered on the axis of the drive shaft 2 and has the first rotary stirring blade 3 of the drive shaft 2.
It is provided on the upper surface. The hollow pipe 5 is a drive shaft 2
It is rotatably fitted in the outer peripheral portion 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, this fixed blade 6 is
Is longer than the rotary stirring blade 3.

The second gear 7 is a gear centered on an axis perpendicular to the axis of the drive shaft 2, is provided in the hollow pipe 5 in the vicinity of the first gear 4, and is provided with the first gear 4. It is meshed. The second rotary stirring blade 8 is provided on the outer peripheral portion of the hollow pipe 5 in the vicinity of the second gear 7.
It is rotatably fitted concentrically with.

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 being displaced upward is attached to the outer peripheral surface near the fixed blade 6 of the drive shaft 2, and the second rotary stirring blade 8 of the hollow pipe 5 is attached. A ring member 11 for preventing slippage is attached to the outer peripheral surface in the vicinity to prevent the second rotary stirring blade 8 from shifting upward.

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

The fixed blade 6 formed longer than the first rotary stirring blade 3 with respect to the rotation of the drive shaft 2 is a weak improvement portion A.
It is fixed at the unimproved part B having a supporting force on the outer peripheral side. Therefore, the hollow pipe 5 provided with the fixed vane 6 is fixed.
Is also fixed to the drive shaft 2. By thus fixing the hollow pipe 5 to the drive shaft 2, the position of the second gear 7 provided on the hollow pipe 5 is fixed, and the first gear 4 rotating with the drive shaft 2 is fixed. Is engaged and 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 integrally rotated with the third gear 8. This second rotary stirring blade 9
The rotation direction of is 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 by the unmodified 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 rotary stirring blade 3 is rotated in the opposite direction to the second rotary stirring blade 3. The stirring blade 8 will rotate. In this way, stirring and mixing can be effectively performed by the rotation of the first rotary stirring blade 3 and the reverse rotation of the second rotary stirring blade 8, and the surroundings of the stirring blades 3 and 8 can be covered with viscous soil or the like. Since it can be prevented from solidifying in a dumpling shape, stirring and mixing can be continuously performed.

Further, the number of ground cuts by the rotary stirring blades 3 and 8 is large and the stirring and mixing property is high as compared with the conventional one which has a stirring function by changing the relative position between the driving blade and the fixed blade. Can be expected. Further, since the drive shaft 2 can be configured by a single shaft, the structure can be simplified and the device can be downsized.

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 The number of blades of the first rotary stirring blade 3 is larger than that of the first rotary stirring blade 3 of FIG.
It is preferable to form a continuous or partially discontinuous ring shape on the circumference of the same diameter as the above because higher stirring and mixing properties can be achieved (the invention according to claims 2 to 4).

In the above embodiment, the fixed blade 6
Is formed longer than the first rotary stirring blade 3 so as to be fixed at the unmodified portion B having a supporting force on the outer peripheral side of the weakened modified portion A, but as shown in FIG. The plate member 16A is provided at a right angle to the plate surface of the blade 16 having the same length as the rotary stirring blade 3 and the plate member 16A functions as a rotation stopper,
The blade 16 may be fixed (the invention according to claim 5).

Alternatively, instead of the fixed blade 6, a friction plate which is 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 invention, the fixed blades are fixed to the unmodified portion having a supporting force on the outer peripheral side of the weakened portion against the rotation of the drive shaft. By fixing the hollow pipe, the second rotary stirring blade rotates in the direction opposite to that of the first rotary stirring blade, and as a result, stirring and mixing can be effectively performed, and the viscous soil or the like surrounds the stirring blade. Since it can be prevented from solidifying in a dumpling shape, it is possible to continuously perform stirring and mixing, and by changing the relative positions of the conventional drive blade and the fixed blade, compared with those that perform a stirring function, Since the number of cutting of the ground by the blade is large, high stirring and mixing property can be expected, and the drive shaft can be configured by a single shaft, the structure can be simplified and the device can be downsized.

According to the inventions of claims 2 to 4, higher stirring and mixing properties are achieved. According to the invention described in claim 5, the plate member provided at right angles to the plate surface of the blade functions as a rotation stopper, and the blade can be fixed, and the second rotary stirring blade is 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 the direction opposite to the direction of the first rotary stirring blade.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the invention according to claim 1.

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

[Explanation of symbols]

 1 Stirrer 2 Drive shaft 3 1st rotation stirring blade 4 1st gear 5 Hollow pipe 6 Fixed blade 7 2nd gear 8 2nd rotation stirring blade 9 3rd gear 16 Blade 16A Plate member

Claims (6)

[Claims] 1. A ground improvement device, which is a stirring device for mixing a soil treatment agent into the ground while stirring, the drive shaft, a first rotary stirring blade provided at a tip end portion of the drive shaft, A first gear provided on the upper surface of the first rotary stirring blade of the drive shaft and having a first gear centered on the axis of the drive shaft and an outer peripheral portion of the drive shaft rotatably fitted concentrically to the drive shaft. A hollow pipe, a fixed blade provided at an end portion of the hollow pipe opposite to the first rotary stirring blade, and a fixed blade longer than the first rotary stirring blade; and a position near the first gear of the hollow pipe. Is provided,
A second gear that meshes with the first gear around an axis perpendicular to the axis of the drive shaft, and a hollow pipe rotatably fitted concentrically with the hollow pipe on an outer peripheral portion of the hollow pipe in the vicinity of the second gear. A second rotary stirring blade, and a third gear that is provided on the lower surface of the second rotary stirring blade and that is centered on the axis of the drive shaft and that meshes with the second gear. A stirring device in a ground improvement device, which is characterized in that 2. The second rotary stirring blade is formed in a shape having a larger area in the direction of the rotation axis than the first rotary stirring blade and the fixed blade. A stirrer in the ground improvement device described. 3. The stirrer in the ground improvement device according to claim 1, wherein the number of the second rotary stirring blades is larger than that of the first rotary stirring blades. . 4. 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. Item 1
A stirrer in the ground improvement device described. 5. A blade provided with a plate member at a right angle to the plate surface is provided in place of the fixed blade.
The stirring device in the ground improvement device according to any one of the above. 6. The stirring device in the ground improvement device according to claim 1, wherein a friction plate is provided in place of the fixed blade.