JPH086822Y2 - Stirrer for ground improvement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an agitator which is preferably used for improving deep ground.

[Prior Art] Conventionally, as a stirring device of this type, for example, a rotating shaft provided with an excavation blade and a stirring blade is attached to a rotation output shaft of an auger drive device, and a slurry is supplied from a tip of the rotating shaft. It is known that a columnar improved body can be formed in the excavated portion by repeating forward and reverse rotations of the rotary shaft and repeating up and down movements while continuously discharging the solidified material in the form of a solid. .

However, with just this, when excavating the ground with a high degree of caking, the clay mass may come into close contact with the excavation blade and the stirring blade and rotate together with the rotating shaft, so perform sufficient stirring and mixing. It is easy to cause the problem that it is not possible.

Therefore, the present inventors have added such a device with a reaction force blade having a large area and a forced stirring blade (a high-speed rotating blade or a reversing blade) that rotates at a different speed or in a different direction than the excavating blade. We have already proposed a method to prevent the co-rotation of soil by the method (Practical application Sho 63-7179).
No. 4). In this device, in the middle of the stirring blade planting region of the rotary shaft, a planetary gear that is arranged around the outer periphery of the rotary shaft with its axis aligned with the rotary shaft, and a pair that meshes with the planetary gear from above and below. A bevel gear and a case surrounding these gears are provided. In the case of rotating the forced stirring blade at a high speed, the planetary gear is axially attached to the rotary shaft, the reaction blade is connected to the one bevel gear, and the forced stirring blade is connected to the other bevel gear. There is. That is, in this setting, when rotation of the reaction force blade having a large area is blocked by the reaction force from the soil, the forced stirring blade moves twice as much as the rotating shaft due to the differential action performed by the planetary gear and the bevel gear. Rotate at the speed of. When the forced stirring blade is rotated in the reverse direction, the planetary gear is axially attached to the case, the reaction blade is planted in this case, the one bevel gear is connected to the rotary shaft, and the other bevel gear is connected. A forced stirring blade is connected to the gear.

[Problems to be solved by the invention] However, in the case of such a configuration, the case accommodating the planetary gears and the bevel gears descends into the excavation hole as the ground is excavated. Therefore, when implementing, it is necessary to use an expensive sealing structure to reliably prevent the entry of mud and moisture into the case, and sand etc. is caught in the sealing part and sealing performance is short-term. It is necessary to devise a device to prevent it from decreasing in a short time.

Further, in the case of soft soil, it may not be possible to give a sufficient reaction force to the reaction force blades, and the reaction force blades may rotate and the desired performance may not be exhibited. There is also.

The present invention aims to solve such problems.

[Means for Solving the Problems] The present invention employs the following means in order to achieve the above object.

That is, the stirring device for ground improvement according to claim 1,
An excavation blade is provided at the lower end of the rotary shaft, and a stirring blade is provided on an outer tube rotatably mounted on the outer periphery of the rotary shaft.
A stirrer for ground improvement, wherein the rotating shaft is connected to a rotating output shaft of an auger drive device capable of moving up and down along a leader, wherein a plurality of shafts are mounted axially orthogonal to the rotating shaft. A planetary gear, a pair of bevel gears that mesh with these planetary gears from above and below, a case that surrounds these bevel gears and a plurality of planetary gears, and a slider that is vertically held by the reader, It is characterized by comprising a slider and a coupling member for coupling the case, wherein one of the bevel gears is connected to the case and the other is connected to the upper end of the outer tube.

Further, the ground improvement agitator according to claim 2 comprises a rotating shaft having an excavation blade, an outer tube having an agitation blade, a planetary gear, a bevel gear paired with the planetary gear, and a case. A plurality of sets of apparatus main bodies of the agitating device for ground improvement according to claim 1 are arranged in parallel with respect to the leader, and a case of the apparatus main body closest to the leader is connected to a slider held by the reader via a connecting member. In addition, the cases of the respective device bodies are connected to each other by an interconnecting member. In this case, each rotary shaft is preferably connected to the rotary output shaft of the common auger drive device via a multi-axis conversion device.

[Operation] According to the configuration as described above, the ground can be improved without lowering the case housing the planetary gear and the pair of bevel gears into the excavation hole.

According to the ground improvement stirring device of the first aspect, one rotation of the bevel gear is always prohibited, so that when the rotation shaft rotates, the planet gear that meshes with one of the bevel gears is the same as the rotation shaft. Rotate while revolving in the direction. Therefore, the other of the bevel gears meshing with the planetary gear rotates at the same speed as the rotation shaft at a high speed, and the stirring blade fixed to the outer pipe rotates at a speed twice as fast as the excavation blade in the ground. become.

When a plurality of sets of apparatus main bodies of the stirring apparatus for ground improvement according to claim 1 are arranged in parallel, the ground at a plurality of locations can be improved at the same time and a continuous wall-shaped solid body can be obtained.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

The stirring device for ground improvement shown in FIGS. 1 to 4 includes a rotary shaft 2 having an excavation blade 1 and an outer pipe 4 having a stirring blade 3.
And a plurality of planetary gears 5 rotatably mounted on the rotary shaft 2 and bevel gears 6 and 7 in pairs that mesh with the planetary gears 5.
The main body 9 including the bevel gears 6 and 7 and the case 8 surrounding the planetary gear 5 is held by the reader 11 via the slider 10 and the like.

The rotary shaft 2 is a hollow one formed by connecting a plurality of upper and lower shafts. Further, the upper end of the rotary shaft 2 located at the uppermost end is detachably connected to the rotary output shaft 12a of the auger drive device 12 which can be moved up and down along the reader 11, and the rotary shaft 2 located at the lowermost end. As shown in FIG. 3, the lower end 2a of the
The excavation blade 1 is attached.

The outer tube 4 is a tubular member that is rotatably mounted on the outer circumference 2b of the rotary shaft 2, and the stirring blade 3 is fixed to the lower end of the outer tube 4. Further, a flange 4b is provided on the upper end 4a of the outer tube 4, and a sealing material is provided between the inner circumference of the lower end of the outer tube 4 and the rotary shaft 2.
14 are installed.

The planetary gear 5 is, as shown in FIG.
It is rotatably supported by a support shaft 5a fixed to the shaft 2b with its axis orthogonal to each other.

The bevel gears 6 and 7 are meshed with the planetary gear 5 from above and below, and an upward sleeve 15 is fixed to a boss portion 6a of one of the bevel gears 6 located on the upper side. A bearing metal 16 is interposed between the inner circumference of the upward sleeve 15 and the outer circumference 2b of the rotary shaft 2. A downward sleeve 17 is fixed to the boss portion 7a of the other bevel gear 7 located on the lower side. A bearing metal 18 is provided between the inner circumference of the downward sleeve 17 and the outer circumference 2b of the rotary shaft 2.

The case 8 is formed by detachably attaching an upper lid 8b and a lower lid 8c to openings of both ends of a cylindrical peripheral wall 8a, and the rotary shaft 2 penetrates through central through holes of the upper lid 8b and the lower lid 8c. are doing.
The upper end of the upward sleeve 15 is fixed to the inner surface of the upper lid 8b by welding or the like. Further, a flange 17a is provided at the lower end of the downward sleeve 17 extending outward from the central through hole of the lower lid 8c, and the flange 17a is provided on the outer tube 4
It is connected to the flange 4b. A seal for preventing oil leakage is provided between the central through hole of the upper lid 8b and the outer circumference 2b of the rotary shaft 2 and between the central through hole of the lower lid 8c and the outer circumference of the downward sleeve 17. Materials 19 and 20 are provided respectively.

The slider 10 is vertically held by two readers 11 arranged in parallel, and is connected to the case 8 via a connecting member 21. The coupling member 21 includes a bracket 21a provided in a convex shape on the peripheral wall 8a of the case 8 and a bracket 21b provided in a concave shape on the slider 10. The bracket 21a on the case 8 side is provided with a plurality of positioning holes 21c at intervals in a direction substantially orthogonal to the rotary shaft 2. Then, the bracket 21a and the bracket 21b on the slider 10 side are fitted to each other by projections and recesses, and the pin 21d is attached to the positioning hole 21c from the outside to join the case 8 and the slider 10. Then, the positioning hole 21
By changing c, the distance between the case 8 and the slider 10 can be changed according to the size of the auger drive device 12.

In addition, 22 is a stop collar for prohibiting axial movement of the bevel gear 6 and the case 8, and 23 is a stop collar for inhibiting axial movement of the bevel gear 7 and the downward sleeve 17. Each is a collar and is fixed to the outer circumference 2b of the rotary shaft 2.

On the other hand, the agitator for ground improvement shown in FIGS. 5 to 7 includes a rotary shaft 2 having an excavating blade 1 at a lower end 2a, an outer pipe 4 having an agitating blade 3 at a lower end, and the rotating shaft. Outer circumference 2b of shaft 2
A plurality of planetary gears 5 arranged in the surroundings, and these planetary gears 5
A device main body 9 comprising a pair of bevel gears 6 and 7 meshed with each other and a case 8 surrounding the bevel gears 6 and 7 and the planetary gear 5, a leader 11 via a slider 10 and the like.
To hold. The parts corresponding to the stirring device for ground improvement described above are denoted by the same reference numerals in the drawings, and description thereof will be omitted.

One bevel gear 6 is connected to the rotary shaft 2, and the other bevel gear 7 is connected to the upper end 4a of the outer tube 4,
The planetary gear 5 is attached to the case 8 by a shaft. The planetary gear 5 is mounted on a support shaft 5a fixed to the peripheral wall 8a of the case 8 with its axis orthogonal to the rotary shaft 2. The boss portion 6a of the one bevel gear 6 arranged on the upper side of the planetary gear 5 has the rotation shaft 2
The boss portion 7a of the other bevel gear 7 located below the planetary gear 5 is fixed to the spacer 24 fixed to the outer periphery 2a of the
It is connected to the upper end 4a of the outer tube 4 via a downward sleeve 17.

According to the stirring device in which the planetary gears 5 are attached to the rotary shaft 2,
Since one of the bevel gears 6 is always prohibited from rotating, when the rotating shaft 2 rotates, the planetary gears 5 revolve in the same direction as the rotating shaft 2 while revolving. Therefore, the other bevel gear 7 meshing with the planetary gear 5 moves in the same direction as the rotary shaft 2 in the same direction.
While rotating at a higher speed, the outer tube 4 rotates at a higher speed like the other bevel gear 7. Therefore, the stirring blade 3 provided on the outer tube 4 always rotates at high speed in the ground at twice the speed of the excavation blade 1, and a plurality of blades having different rotation speeds exist in the ground. .

Further, according to the stirrer in which the planetary gears 5 are axially attached to the case 8, the planetary gears 5 are always prevented from revolving, so that when the rotating shaft 2 rotates, the planetary gears 5 are at the same position and one bevel gear 6 is formed. Will rotate on its own. Therefore, the other bevel gear 7 meshing with the planetary gear 5 rotates in the opposite direction to the one bevel gear 6 at the same speed as the bevel gear 6, and the outer tube 4 rotates like the other bevel gear 7. . Therefore, the stirring blade 3 provided in the outer tube 4 always rotates in the opposite direction to the excavating blade 1 in the ground at the same speed as the excavating blade 1, and a plurality of blades having different rotating directions exist in the ground. Will be done.

Therefore, according to the respective stirring devices having the above-mentioned configurations, the clay lump can be effectively sheared, and it is effective that the clay lump adheres to the rotating shaft 2 and the outer tube 4 and rotates together. Can be suppressed. As a result, not only in the case of soft soil, but also in the case of soil improvement of clay layers with high caking properties,
The excavated soil and the hardened material can be sufficiently stirred and mixed.

Moreover, according to these agitating devices, the case 8 accommodating the planetary gears 5 and the bevel gears 6 and 7 does not descend into the excavation hole, so that it is possible to ensure that mud, water, etc. enter the case 8. It is not necessary to employ an expensive sealing structure for preventing it, and it is not necessary to take special measures to prevent the sealing performance from being deteriorated in a short period of time due to sand or the like being caught in the sealing portion.

In addition, there is also a method of separately attaching a motor to the rotary shaft and the outer tube to separately drive the excavating blade and the stirring blade,
According to this device, the structure can be simplified as compared with such a device, and the general-purpose auger drive device 12 and the like can be effectively used.

In the stirring device shown in FIG. 8, a plurality of sets of the device main body 9 having the above-described configuration are installed in parallel with the reader 11, and the reader 11
The case 8 of the apparatus main body 9 closest to is connected to the slider 10 held by the leader 11 via the connecting member 21, and the cases 8 of the respective apparatus main bodies 9 are connected to each other by the interconnecting member 25 so as to be separable from each other. It will be.

With such a configuration, the ground at a plurality of locations can be improved at the same time, and a continuous wall-shaped solid body can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the excavating blades, the stirring blades, and the like can be variously modified.

[Advantages of the Invention] Since the present invention has the above-mentioned configuration, it has the following effects.

First, according to the stirring device for ground improvement according to claim 1, the stirring blade inserted into the ground can be reliably rotated in the same direction as the excavating blade at a speed twice that of the excavating blade. It is possible to effectively suppress the rotation of the excavated soil that tries to rotate together with the shaft, etc., and effectively shear the clay mass. Therefore, the excavated soil and the hardened material can be sufficiently agitated and mixed not only in the case of the soft soil but also in the case of the ground improvement of the clay layer having a high caking property.

Further, according to the stirrer for ground improvement of claim 2, in addition to the above effects, the ground at a plurality of locations can be improved at the same time, and a continuous wall-shaped solid body can be obtained. .

Further, according to each of the stirring devices described above, it is not necessary to lower the case containing the planetary gear and the pair of bevel gears into the excavation hole. Therefore, it is not necessary to use an expensive seal structure for surely preventing the entry of mud, water, etc. into the case, and sand etc. will be caught in the seal part and the sealing performance will be reduced in a short time. Since it is not necessary to make any special device for preventing the above, the sealing can be performed relatively easily. Moreover, since the excavating blade and the stirring blade can be reliably driven to rotate by the common motor, and a general-purpose auger drive device or the like can be effectively used, the structure can be simplified easily.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall view, FIG. 2 is a sectional view showing an essential part, FIG. 3 is a partial sectional view showing a lower part of an apparatus main body, FIG. 4 is a plan view, FIG. 5 is a sectional view showing the main part corresponding to FIG. 2, and FIG. 6 is a third view showing the lower part of the apparatus main body.
FIG. 7 is a partial sectional view corresponding to FIG. 7, FIG. 7 is a partially omitted view in the direction of arrow A in FIG. 6, and FIG. 8 is a schematic plan view in the case where the apparatus main body is multi-connected. DESCRIPTION OF SYMBOLS 1 ... Excavation blade, 2 ... Rotating shaft 2a ... Lower end, 2b ... Outer periphery 3 ... Stirring blade, 4 ... Outer tube 4a ... Upper end, 5 ... Planetary gear 6 ... One bevel gear, 7 ... Other bevel gear 8 ... Case , 9 ... Device body 10 ... Slider, 11 ... Leader 12 ... Auger drive device 12a ... Rotation output shaft, 21 ... Coupling member 25 ... Mutual coupling member

Claims (2)

[Scope of utility model registration request] 1. A drive for an auger capable of raising and lowering a rotating shaft along a leader by providing an excavating blade on the lower end of the rotating shaft and a stirring blade on an outer tube rotatably mounted on the outer periphery of the rotating shaft. A stirring device for ground improvement connected to a rotary output shaft of the device, a plurality of planetary gears axially attached to the rotary shaft with its axis orthogonal to each other, and on these planetary gears,
A pair of bevel gears that mesh with each other from below, a case that surrounds these bevel gears and a plurality of planetary gears, a slider that is held up and down by the leader, and a connecting member that connects the slider and the case. And one of the bevel gears is connected to the case, and the other is connected to the upper end of the outer pipe. 2. An apparatus main body comprising a rotating shaft having excavation blades, an outer tube having stirring blades, a planetary gear, a bevel gear paired with a case, and a case, for a reader. Multiple sets are installed side by side, and the case of the device main body closest to the leader is connected to the slider held by the reader via the connecting member, and the cases of each device main body are connected by the interconnection member. Claim 1 characterized by
A stirrer for ground improvement as described.