JP3282670B2 - Stirring device in ground improvement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil cement in which a hardening agent such as cement milk and an excavated earth and sand are hardened while being uniformly stirred and mixed in order to improve soft ground in foundation work or the like. The present invention relates to improvement of a stirrer in a ground improvement method used when a pile or a soil cement column pile is formed in the ground.

[0002]

2. Description of the Related Art Conventionally, various types of agitation devices have been researched, developed, and proposed in this type of ground improvement method. For example, in Japanese Patent Publication No. 63-38497, a rotating blade is fixedly mounted on a rotating spindle, and a gear case is provided in a state of being cut off from the rotating spindle, and a driving umbrella that rotates integrally with the rotating spindle in the gear case. A gear and a driven bevel gear are provided in parallel with the drive bevel gear, and a side bevel gear is provided inside the gear case in a state in which the driven bevel gear is meshed with the two bevel gears. Providing a direct reaction wing radially, further providing a reversing wing that rotates integrally with the driven bevel gear, and excavating bits fixed to the tip of the rotating main shaft and earth and sand excavated by a digging part comprising a digging wing. There is known a stirrer configured to stir and mix a curing agent supplied through a rotating shaft by forward and reverse rotation of the forward rotating blade and the reverse rotating blade.

[0003] In this type of soil improvement method, it is important to firstly grind the excavated earth and sand to a state where there is no lump, and secondly, to harden the finely ground earth and sand such as cement milk. The uniform stirring and mixing with the agent makes it possible to form a soil cement pile or a soil cement column pile having the desired strength in the ground. In other words, there is no earth mass in the created pile,
Moreover, the pile having the desired strength as a whole is formed only when the earth and sand and the hardener are uniformly mixed.

[0004]

However, in the above-described conventional stirring device, the so-called co-rotational phenomenon in which the earth and sand rotates together with the stirring blade due to the offsetting action of the forward and reverse rotating blades rotating forward and backward with respect to each other. Although it was developed to improve the efficiency of stirring with the curing agent, the above-mentioned first object was not achieved as a practical problem, and particularly, viscous soil and fiber having strong adhesive force remained. On the ground to be improved such as organic soil (beet layer), the soil mass remains in the formed pile without being finely crushed, and the desired uniform strength resistance may not be obtained on the entire pile.

[0005] In addition, the agitation device of this type of ground improvement method applies a large rotational torque to an excavation portion (also referred to as an excavation head), a forward rotation blade and a reverse rotation blade. The absolute condition is to increase the meshing connection area). However, since the conventional device employs a bevel gear mechanism, as the number of meshing teeth increases so that a large rotational torque can be obtained, each bevel gear itself is increased. The diameter needs to be increased. That is, it is necessary to relatively increase the size (outer diameter) of the gear case in which the drive bevel gear, the driven bevel gear, and the side bevel gear group are incorporated. Therefore, according to the conventional stirring device, not only the length of the forward and reverse rotating blades must be shortened, but also the scraping up of the earth and sand between the inner surface of the excavation hole and the outer surface of the gear case and the stirring space become narrower. In addition, the excavation of earth and sand during excavation becomes worse,
Problems such as influencing the mixing property still remain.

[0006] This type of agitating device is mainly used for soft ground improvement. However, it is possible to prevent unexpected hard layers in the ground and obstacles such as large stones from obstructing forward and reverse blades and reaction force blades. Although it is frequently damaged due to hitting, etc., it is necessary to repair or replace it.However, in the conventional device, the rotating main shaft constituting the device is directly equipped with both forward and reverse rotating blades and reaction force blades by welding etc. Therefore, if each of these wings is damaged, stop the work and drive the ground machine
Remove the stirrer itself from and bring it to a repair shop, etc.
Repair of damaged wings or their replacement is required.
During that time, there was a problem that the work was interrupted and the construction period was delayed.

The present invention has been made in view of such a conventional situation, and its object is to surely prevent the co-rotation phenomenon, to further improve the crushing action of the earth and sand, and to perform excavation and stirring. Sufficient rotating torque can be set arbitrarily without increasing the outer diameter, and the most effective pulverization and agitation for cohesive soil, organic soil, or alternate ground improvement of them An object of the present invention is to provide a stirring device in the obtained ground improvement method.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotating main shaft having an outer spur gear and a forward rotating blade provided on a lower side, and a coaxial shaft around the rotating main shaft. rotatably disposed, the reverse shaft tube with a reversing blade up and down and having an internal Invite spur gear, distribution on the upper side of the rotary spindle while being edge cutting between the rotary spindle and the reversing shaft tube A plurality of reaction force axles provided with reaction force wings, and a plurality of spur gears between the inner and outer spur gears. It is composed of a plurality of pinion gears disposed in a state of being, of reversing blades of the upper and lower
Of which the lower reversing blades are spaced above the forward
So that the upper reversing wing has an appropriate space below the reaction wing.
The gist is that each is disposed on the reverse shaft cylinder .

Further, according to the present invention, the lower reversing blade and the forward blade
The vertical spacing between the upper reversing wing and the reaction wing,
It is set within the range of 20 to 30% of the stirring diameter (digging diameter)
To summarize. Desirably, it is 20 minutes and 5 minutes. For example,
When the stirring diameter π is 1000 mm, an interval of about 250 mm is desirable.
No. Further, before the vertical interval between the lower reverse rotor and the forward rotor,
The vertical spacing between the upper reversing wing and the reaction wing is not set narrow.
The point is that

According to the above technical means, when the rotating main shaft rotates, the reaction blade does not rotate due to the reaction force resistance between the excavation hole and the inner ground. That is, each pinion gear meshing with the outer spur gear at several places in the circumferential direction of the rotating main shaft while being axially mounted on the reaction shaft cylinder having the reaction blades moves around the rotating main shaft along the outer spur gear. Without rotating the rotating spindle in the opposite direction to the rotating direction, power is transmitted to the reverse rotating barrel having an inner spur gear, and the reverse rotating barrel is rotated in the direction opposite to the rotation of the rotating spindle. That is, the forward rotor and the upper and lower reverse rotors are rotated in opposite directions opposite to each other. to this
Large earth and sand mass just after being excavated by the excavator
Is a certain size due to the intersection between the forward and lower reverse wings
Crushed. Due to the intersection of the lower reverse wing and the forward wing,
The crushed mass is updated by the intersection between the upper reversing wing and the reaction wing.
Is finely ground. In other words, the crushing of the earth mass
For crossing with forward wings , and for upper reverse wings and reaction wings
More effective and efficient with two-stage up and down
Done. And in parallel with this, the hardener and fine powder
Stirring and mixing with crushed earth and sand are performed uniformly and efficiently.
You.

As a method of obtaining a rotational torque necessary for crushing excavated earth and sand and stirring and mixing with a hardening agent, an arrangement of a pinion gear in a circumferential direction between an outer spur gear and an inner spur gear is used. Increase the number of meshing teeth with the inner and outer double spur gears by increasing the number of installations, or increase the meshing area of one tooth by increasing the length of the inner and outer double spur gears including the pinion gear in the axial direction. In any of these methods, without changing the size (outer diameter) of the reversing shaft cylinder,
It is possible to cope with it, that is, the length of the forward and reverse rotating blades, which hinder the excavation and removal of excavated earth and sand and its crushing and agitation and mixing with the hardening agent, become shorter, and the excavation hole is scraped up And without rotating the stirring space,
The rotational torque of the reversing two wings can be adjusted and set arbitrarily.

In addition, the crushing of the excavated earth and sand and the stirring and mixing with the hardener are within the range of 20 to 30% of the stirring diameter (digging diameter).
Desirably, intersect at a set interval within a range of 20 minutes
Crossing between the lower and forward wings, and the upper wing
Effective and effective in the vertical position of the intersection between the
It is done efficiently. That is, as described above,
Soil crushed to a certain size by crossing with the forward wing
The mass is an upper reversing wing and reaction wing with a narrower vertical spacing
It is further finely crushed by the intersection between This allows
The crushing of the lump is surely fine due to the crushing action of the upper and lower stages
The mixing and stirring with the curing agent are also performed reliably.

[0013] The effect of grinding the earth and sand and stirring the hardener is as follows.
The number of times the blades intersect per time (per minute) is key, but is performed in a two-stage configuration with the above-mentioned lower reverse wing and forward wing, and upper reverse wing and reaction wing. For example, when the rotation speed of the rotating main shaft is 30 rpm and the rotation speed of the reverse rotation shaft cylinder is 18 rpm , the number of intersections between the lower reverse rotation blade and the forward rotation blade is 48 times / minute, and the upper reverse rotation blade and the reaction force blade are different. The number of crossings is 18 times / minute, for a total of 66 times / minute.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of an embodiment of the stirring device of the present invention. The forward rotating blade 2 is detachably connected to the lower end of a driving main shaft 10 of a ground machine and rotates by its power.
A rotating shaft cylinder 4 having a reversing blade 3 is coaxially rotatable around the rotating main shaft 1 with a cutting edge. The rotating shaft 4 is provided at several places in the circumferential direction between the rotating shaft cylinder 4 and the rotating main shaft 1. The reaction force wing 7 is engaged with the outer spur gear 5 provided on the outer peripheral surface of the rotating main shaft 1 and the inner spur gear 6 provided on the inner peripheral surface of the reversing shaft barrel 4, respectively. A plurality of pinion gears 9 are arranged in a state where the pinion gears 9 are attached to the reaction force barrel 8 provided.
That is, when the rotating main shaft 1 is rotated by the power of the driving main shaft 10, the excavating unit 11 including the excavating wings 12 coaxially directly connected to the lower end of the rotating main shaft 1 excavates the improved ground while rotating in the same direction. Each of the pinion gears 7 meshingly connected to the outer spur gear 5 of the rotary main shaft 1 rotates in the opposite direction to the rotation direction of the rotary main shaft 1 to supply power to the reverse rotation shaft cylinder 4 having the inner spur gear 6 meshed and connected. The reverse rotation shaft cylinder 4 is
It is configured to rotate in a direction opposite to the rotation of. Thereby, the forward wing 2 and the reverse wing 3 are rotated in opposite directions opposite to each other to crush the excavated earth and sand,
Stir and mix the crushed earth and sand with the hardener.

The rotating main shaft 1 is formed such that the upper half 1-1 side is slightly narrower than the lower half 1-2 side, and has a large diameter section 1-3 at the upper end.
The upper half 1-1 (hereinafter, referred to as a small diameter shaft portion) including a stepped portion 1-30 that is narrower than the large diameter portion 1-3 is formed. 4 and the reaction force barrel 8 are formed so as to be cut off, and the forward blade 2 is detachably mounted on the lower half 1-2 via a blade mounting member A13. ing.

An outer spur gear 5 is engraved on the outer peripheral surface of the small-diameter shaft portion 1-1 in a required range in the axial direction, and a driving pin (not shown) is formed on the upper large-diameter portion 1-3. (Commonly referred to as a hexagonal joint) with an upper connecting portion 14 which is coaxially detachably connected to the driving main shaft 10, and the excavation portion 11 is mounted at the lower end so as to be coaxially detachable by a driving pin 15. It is formed (see FIG. 7).

The reverse rotation barrel 4 is provided with a large-diameter portion 1-1 at the upper end of the rotary spindle 1.
3 has the same diameter as the outer diameter, and has a cylindrical shape whose length is almost the same as the length of the small-diameter shaft portion 1- of the rotary spindle 1 and whose outer shape is straight. 1 and is formed so as to be coaxially rotatable around the small-diameter shaft portion 1-1 via a rotating member 16 formed of a bearing or the like. The inner diameter of the large-diameter hole 4-1 corresponding to the outer spur gear 5 of the small-diameter shaft portion 1-1 is formed so that the inner diameter toward the upper-end opening is twice larger than the inner diameter of the lower-end opening side. An inner spur gear 6 is engraved on the surface. Although not shown, the reverse rotation barrel 4 is, for example, a lower part which is rotatably supported by the rotating main shaft 1 via a rotating member 16, an intermediate part provided with an inner spur gear 6, and a reaction force. By connecting a plurality of divided cylinders divided in the axial direction such as an upper side where an inner cylinder portion 8-1 described later of the shaft cylinder 8 is internally provided with a hexagon wrench bolt, as shown in the figure, It is formed into a cylindrical shape having a required length with a stepped shape and a straight outer shape.

The reaction force barrel 8 is provided with a spur gear 5 outside the rotary spindle 1.
And a plurality of pinion gears 9 arranged at several locations in the circumferential direction while being engaged with the inner and outer ring spur gears 5 and 6 between the inner ring spur gear 6 and the inner ring spur gear 6 of the reverse rotation shaft cylinder 4. It plays a role, and the small diameter shaft part 1-1 of the rotating main shaft 1 and the reverse rotation barrel 4
The inner cylindrical portion 8-1 inserted and fitted in a state of being cut off with the large-diameter hole portion 4-1, and the upper end of the rotary spindle 1 connected to the upper end opening of the inner cylindrical portion 8-1. An outer cylinder part 8- in which the outer diameter is the same as the outer diameter of the reversing shaft cylinder 4 at the inner diameter provided around the step portion 1-30 of the large diameter section 1-3.
2 form a stepped inner and outer cylindrical shape, and are formed so that the reaction force wing 9 can be detachably attached to the outer cylinder portion 8-2 via the wing mounting member C17. Then, pinion gears 9 are mounted at several positions (eight positions in the figure) in the circumferential direction with the lower end opening of the inner tube portion 8-1 facing the tube extension direction (see FIGS. 2B and 8). Although not shown, the reaction force shaft cylinder 8 is formed by connecting an inner cylinder portion 8-1 and an outer cylinder portion 8-2 with a hexagon wrench bolt to form a stepped inner and outer step as shown. It is assembled and formed into a cylindrical shape.

The forward blade 2 is fixed to the blade mounting member A13 at an appropriate twist angle, scrapes up the excavated earth and sand, crushes the earth and sand, and agitates the crushed earth and hardener. -It is installed so that mixing can be performed efficiently by cooperation with the excavating wing 12 and the reversing wing 3.

The wing mounting member A13 includes a lower half 1- of the rotary spindle 1.
On the second side, it is formed in a ring shape having an inside diameter that can be inserted and removed so that it can be inserted and removed in the axial direction. The forward rotation blade 2 is fixed horizontally to the outer peripheral surface at an appropriate twist angle, and a screw hole 18 is opened.
It is formed so that it can be positioned and adapted to the fixing hole 19 opened in the lower half 1-2 of the rotary spindle 1 and can be detachably attached and fixed by fixing bolts 20 (FIG. 2B).
6 and FIG. 9).

The reversing blade 3 is composed of an upper reversing blade 3-1 and a lower reversing blade 3-2 arranged above and below the reversing shaft cylinder 4. The respective reversing blades B21 and B22 have an appropriate twist angle. Digging and fixing the excavated earth and sand, and crushing the earth and sand,
It is mounted so that the stirring and mixing of the pulverized earth and sand and the hardening agent can be efficiently performed by the cooperative operation with the forward blade 2 and the reaction blade 7. The torsional directions of the reverse rotating blades 3-1 and 3-2 are opposite to the torsional direction of the forward rotating blade 2 (see FIG. 2A).

The blade mounting member B21 is formed in a ring shape having an inner diameter capable of being inserted into and pulled out of the reversing shaft barrel 4 in an axial direction, and the upper reversing blade 3-1 is horizontally fixed to the outer peripheral surface at an appropriate twist angle. At the same time, a screw hole 23 is opened, and it is formed so that it can be removably attached and fixed by a fixing bolt 20 by being positioned and adapted to a fixing hole 24 opened in the reverse rotation shaft cylinder 4 (FIG. 2B). 4 and FIG. 9). The wing mounting member B22 is formed in a cylindrical shape whose inner diameter is the same as or slightly larger than the outer diameter of the lower side 1-2 of the rotary spindle 1.
The lower reversing blade 3-2 is horizontally fixed to the outer peripheral surface at an appropriate twist angle, and several mounting holes 25 opened in the upper flange 22-1 in the circumferential direction are formed at the lower opening edge of the reversing shaft cylinder 4. Screw hole
It is formed so as to be removably attached and fixed by a fixing bolt 27 so as to be aligned with and adapted to 26 (FIG. 2).
(B) and FIGS. 5 and 9).

The reaction force wing 7 is vertically fixed to the wing mounting member C28 so that its open end bites into the inner surface of the excavation hole X (see FIG. 1). It is mounted so that it cannot be rotated.

The wing mounting member C28 is provided on the outer cylindrical portion 8-
2 is formed in a ring shape having an inner diameter that can be inserted and removed in the axial direction, the reaction force wing 7 is horizontally fixed to the outer peripheral surface, the screw hole 29 is opened, and the outer cylindrical portion 8-2 is opened. It is formed so that it can be removably attached and fixed by the fixing bolt 20 by being aligned and fitted to the fixing hole 30 (see FIGS. 2B, 3 and 9).

In the present invention, the vertical distance L1 between the forward rotation blade 2 and the lower reverse rotation blade 3-2 and the vertical distance L2 between the upper reverse rotation blade 3-1 and the reaction blade 7 are determined by the stirring diameter (excavation). Diameter) 2-3 of π
It is important to set it within a certain range.
It is 5 minutes. For example, when the stirring diameter π is 1000 mm, 25
An interval of around 0 mm is desirable. The reason is 2
Below the threshold, the rotational torque of the earth and sand applied to the forward blade 2 and the reverse blade 3, particularly the rotational torque applied to the forward blade 2 and the reverse blade 3 when the sand is crushed, becomes large, causing damage to each blade and the drive system in a short period of time. If the ratio exceeds 30%, not only is the effect of preventing earth and sand from rotating together, but also the effect of pulverizing the earth and sand and agitation with the hardener is extremely poor.

In the present invention, the forward blade 2 and the lower reverse blade 3-2 are used.
It is important to set the vertical distance L2 between the upper reversing wing 3-1 and the reaction force wing 7 smaller than the vertical distance L1 between them. The reason is that the large earth mass immediately after excavation is crushed to a certain size between the forward wing 2 and the lower reverse wing 3-2, and further crushed between the upper reverse wing 3-1 and the reaction wing 7. This is because pulverization improves the pulverization effect, and furthermore provides various effects such as reducing the load applied to each of the blades 2, 3, and 7 to improve the service life thereof.

According to the stirring device of the present embodiment configured as described above, when the rotating main shaft 1 rotates, each pinion gear 9 meshing with the outer spur gear 5 of the rotating main shaft 1 causes the rotating main shaft 1 to rotate. While rotating in the opposite direction to the direction of rotation, the power is transmitted to the reverse rotation shaft cylinder 4 having the inner spur gear 6, thereby rotating the reverse rotation shaft cylinder 4 in the direction opposite to the rotation of the rotary main shaft 1 and rotating forward. The wing 2 and the reversing wing 3 (3-1, 3-2) are rotated in mutually opposing forward and reverse directions. Therefore, the excavated earth and sand, especially the co-rotational phenomenon of the earth and sand accompanying the adhesion which is often seen on the sticky and viscous soil and the like is prevented, and the earth and sand are crushed and, at the same time, the stirring and mixing with the hardening agent such as cement milk are performed. .

If any of the forward wing 2, the reverse wing 3, and the reaction wing 7 is damaged during the excavation work by an obstacle such as an unexpected hard layer or large stones in the ground, for example, the forward wing If the wing 2 is damaged, the fixing bolts 20 are removed, the fixing state of the wing mounting member A13 to the rotary main shaft 1 is removed, and the wing mounting member A13 is pulled out in the axial direction, so that the forward rotation wing 2 is rotated by the rotary main shaft 1. , The work can be continued by replacing it with a substitute or forward wing 2 prepared separately.

[0029] Further, the lower reversing blade set at the vertical interval L1 in which the crushing of the earth and sand and the stirring and mixing with the hardener are reliably performed.
A large mass of earth and sand is crushed by the intersection between 3-2 and the forward blade 2, and between the upper reverse blade 3-1 and the reaction blade 7 where the vertical distance L2 is further narrowed. Since the crushing of the earth mass is more effectively performed by the crossing, the crushing and the stirring of the hardener are performed.
Mixing is ensured. In other words, crushing of earth and sand
Reversing the lower part where the stirring and mixing with the hardener is set at the interval L1
The intersection between the wing 3-2 and the forward blade 2 and the narrower space L2
On the intersection between the fixed upper reversing wing 3-1 and the reaction force wing 7
Efficient and reliable operation is achieved by two steps below. Follow
Important in this type of ground improvement method.
Finely crushing the sand to a state without clods; and
Finely pulverized earth and sand are hardened with a hardener such as cement milk.
Crush and mix the earth and sand to be stirred and mixed together with the hardener
Is possible, so that the soil
Efficient underground for cement piles or soil cement column piles
And it can be reliably formed.

The crushing of the earth and sand and the stirring and mixing of the hardener are carried out in a two-stage up and down manner by a lower reverse blade 3-2 and a forward blade 2 and an upper reverse blade 3-1 and a reaction blade 7. For example, rotating spindle 1
Is 30 rpm and the rotation speed of the reverse rotation shaft cylinder 4 is 18 rpm , the number of intersections between the lower reverse rotation blade 3-2 and the normal rotation blade 2 is 48.
Times / minute, the number of intersections between the upper reverse wing 3-1 and the reaction wing 7 is 18
The number of times the blades 2, 3, and 7 are crossed per time (minutes) is 66 times / minute in total. Therefore, since the number of crossings per hour is expected to increase by nearly 40%, efficient pulverization and stirring operations can be performed. Moreover, there is no earth mass in the formed pile, and the earth and sand and the hardener are uniformly stirred and mixed. Therefore, it is possible to expect such effects that a high-strength pile having uniform strength can be obtained as a whole.

The vertical distance L1 between the lower reverse rotation blade 3-2 and the forward rotation blade 2 and the vertical distance L2 between the upper reverse rotation blade 3-1 and the reaction force blade 7 are described.
Is set within the range of 20 to 30% of the stirring diameter π, desirably 20% and 5 minutes, so that the pulverization of the earth and sand and the stirring and mixing with the curing agent are performed efficiently and reliably. .

FIG. 10 shows another embodiment.
The vertical spacing L between the excavating / forward rotating blade and the lower reverse rotating blade 3-2 described in detail in the above-described embodiment is used together with the forward rotating blade 2.
1 and the vertical distance L2 between the upper reversing blade 3-1 and the reaction blade 7 is set within a range of 20 to 30% of the stirring diameter (digging diameter) π, and the vertical distance L2 is narrower than the vertical distance L1. Set it.
In such an embodiment, the same reference numerals are used in the same components as those in the above-described embodiment, and the description thereof will be omitted. That is, the stirrer according to the embodiment uses the forward blade 2
The components other than those used in combination with the excavation wings 12 of 11 are basically the same as those in the above-described detailed description of the embodiment, and also reliably prevent the co-rotation phenomenon, further improve the crushing action of the earth and sand,
And sufficient rotation torque necessary for excavation and agitation can be set arbitrarily without increasing the outer diameter of the device, that is, the outer diameter of the reversing barrel 4, and it is also possible to set viscous soil, organic soil, or The most effective pulverization and agitation for improving the ground of these alternate layers can be obtained, and furthermore, the forward and reverse blades 2 and 3 and the reaction force blade 7 can be detached to improve maintenance, workability, and handling. The same is true for the function and effect of the present invention, and the description thereof is omitted.

[0033]

The stirrer in the ground improvement method of the present invention is constructed as described above, and has the following effects. . When the rotating main shaft rotates, each pinion gear meshing with the outer spur gear while being supported by the reaction shaft barrel is rotated in the opposite direction to the rotating direction of the rotating main shaft, and the inner rotating spur gear has a reverse rotating shaft. Power is transmitted to the cylinder, and the reverse rotation cylinder is rotated in a direction opposite to the rotation of the rotating main shaft. That is, the forward blade and the reverse blade rotate in opposite directions, which are opposite to each other. This allows
Excavated earth and sand, especially sticky cohesive and organic soils,
Or with the adhesion that is often found in their alternating layers, etc.
Large sediment immediately after excavation to prevent the co-rotation of sediment
Crushing of soil mass is a crossover between lower counter-rotating wings and normal wings
Crushed to the size of
It is crushed finely by intersecting. In other words, vertically
Efficient and efficient pulverization of soil mass
Done. In addition, a curing agent
Stirring and mixing are performed efficiently and reliably in a two-stage upper and lower position.
You. Therefore, there is no lumps in the formed pile,
Agent is evenly stirred and mixed to provide uniform strength throughout
A stirrer that can create the resulting high-strength pile
Can be provided.

. Stirring and mixing of the milled and the curing agent of sediment is carried out in the vertical twofold by crossing between the crossing, the upper reversing blade and the reaction force wing between the lower reversing blade and Seitentsubasa as described above Thus, for example, when the rotation speed of the rotating main shaft is 30 rpm and the rotation speed of the reverse rotation shaft cylinder is 18 rpm , the number of intersections between the lower reverse rotation blade and the forward rotation blade is 48 times / minute, and the reaction force between the upper reverse rotation blade and the upper reverse rotation blade. The number of crossings with the wings is 18 times / minute, and the number of crossings of each wing per time (minutes) is 66 times / minute in total. Therefore, in addition to the certainty of the pulverization of the clay and the stirring and mixing with the hardener, the number of crossings per hour (per minute) is expected to increase by nearly 40%, so that the pulverization and curing of the clay more efficiently. Agent
Can be stirred and mixed. As a result, drilling
It is possible to achieve a wide range of shortening and improve the workability.
A stirring device can be provided.

[0035] Further, according to the present invention, the agitation diameter (digging diameter) of 2 to 3 in which the pulverization of the earth and sand and the agitation / mixing with the hardener are reliably performed.
Lower reversing wings that intersect at vertical intervals set within a certain range
Large earthmass immediately after being excavated by the intersection between
Grinding is performed, and the upper and lower
Upper reversal intersecting at a vertical interval set narrower than the interval
The crushing of the earth mass was further performed by the intersection between the wing and the reaction wing.
You. As a result, large earthmass immediately after excavation
By being crushed finely in an effective and reliable manner,
As mentioned above, there is no earth mass in the pile created,
Uniform strength resistance throughout when the curing agent is evenly stirred and mixed
It is possible to construct a high-strength pile that can obtain the above.

[0036]. According to the present invention, the number of pinion gears arranged in the circumferential direction between the outer spur gear and the inner spur gear is increased to increase the number of meshing teeth with the inner and outer spur gears, or To obtain the rotational torque required for grinding and mixing earth and sand and stirring / mixing with a hardener by increasing the meshing area of each tooth by lengthening the inner and outer spur gears including gears in the axial direction. Can be. Therefore, unlike the conventional stirring device, the length of the forward and reverse rotating blades which hinders the excavated earth and sand from being scraped up and carried out and crushing and stirring / mixing with the hardening agent becomes shorter, The rotation torque of the forward and reverse rotating blades can be arbitrarily adjusted and set without raising the air and narrowing the stirring space.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of a stirring device of the present invention.

2A is a side view of the same, and FIG. 2B is a vertical sectional view of the same.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a cross-sectional view taken along line VV of FIG. 1;

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 1;

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 1;

FIG. 8 is an enlarged cross-sectional view taken along the line VIII-VIII of FIG. 2 (b).

FIG. 9 is a perspective view showing a state in which a forward wing, upper and lower reverse wings, a reaction wing, and an excavation part are removed.

FIG. 10 is a front view showing another embodiment of the stirring device of the present invention.

[Explanation of symbols]

1: rotating main shaft 2: forward rotating blade 3: reverse rotating blade 3-1: upper reverse rotating blade 3-2: lower reverse rotating blade 4: reverse rotating shaft cylinder 5: outer spur gear 6: inner spur gear 7: reaction force blade 8 ： Reaction shaft 9 ： Pinion gear 10 ： Drive spindle 11 ： Excavation part 12 ： Excavation wing 13 ： Attachment member A 20 ： Fixing bolts 21, 22 ： Attachment member B 28 ： Attachment member C

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 3/12 102

Claims (2)

(57) [Claims] An outer spur gear and a forward wing are provided at a lower part.
A revolving spindle provided on the side, a coaxially rotatable around the revolving spindle, a reverse revolving barrel having an inner spur gear, and having reversing blades above and below, between the reversing revolving barrel and the rotating main spindle. A reaction shaft barrel provided with a reaction blade in the upper side of the rotary spindle in a state of being cut off, and a circumference between the inner and outer double spur gears while being axially mounted on the reaction shaft cylinder. And a plurality of pinion gears disposed in mesh with the inner and outer spur gears at several locations in the direction , and a lower one of the upper and lower reversing blades is an upper side of the forward one.
At an appropriate interval, the upper reversing wing is positioned below the reaction wing.
A stirrer in the ground improvement method, wherein each of the stirrers is disposed on the reversing shaft cylinder at appropriate intervals . 2. A method according to claim 1, wherein the lower reverse rotation blade and the forward rotation blade are connected to each other.
The distance between the upper reversing blade and the reaction force blade is 2-3 times the stirring diameter.
And is set within the range above and below the vertical interval between the lower reverse blade and the forward blade.
A stirrer in a ground improvement method , wherein a vertical interval between a partial inversion wing and a reaction force wing is set to be small .