JPH0827772A - Mixing and stirring device for ground improvement - Google Patents

Abstract

PURPOSE:To prevent biting of a foreign matter between a stirring blade and a connecting plate during digging and stirring work by using a mixing and stirring device for foundation improvement provided with the stirring blade and the connecting plate. CONSTITUTION:Connecting plates 11, 11 are respectively provided as close to each other as possible against stirring blades 14, 14, 14. Thereafter, the connecting plates 11, 11 are formed so as to move vertically against rotation axes 12, 12. Furthermore, the connecting plates 11, 11 are constantly energized downward by coil springs 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement mixing and agitating apparatus, and more particularly to a ground improvement mixing and agitating apparatus capable of efficiently agitating and mixing with a stirring blade and a connecting plate. .

[0002]

2. Description of the Related Art A conventional mixing and stirring apparatus for ground improvement will be described with reference to FIG. In the figure, reference numeral 1 denotes a ground improvement mixing and stirring device installed in a moving vehicle such as a crawler, and rotating shafts 3, 3 are attached to horizontally extending connecting plates 2, 2. The rotating shafts 3 are pivotally attached to the connecting plate so as to be rotatable in the horizontal direction.

The rotary shafts 3, 3 are constructed so that they can be rotationally driven by a rotary drive device using a motor (not shown). Further, stirring blades 4 and 4 are fixedly provided under the connecting plates 2 and 2 of the rotary shaft 3 so as to be close to each other.
Excavating blades 5 and 5 are attached to the tip of 3. A discharge port 6 is provided at the tip of the rotary shaft 3 for discharging a soil improvement material such as cement milk that is pressure-fed through the inside from above.

[0004]

In order to maintain the performance of stirring and mixing, the above-mentioned conventional example is constructed by making the vertical distance between the stirring blade and the connecting plate as small as possible, especially in a highly viscous formation. . Thus, the stirring blade connected to the rotary shaft causes the rotation to move the excavated soil excavated by the drilling blade and the ground improvement material ejected from the discharge port provided at the tip of the rotary shaft. During this time, the connecting plate keeps its rotation stopped and stays stopped, so that the excavated soil during the rotational movement is normally shredded between the connecting plate and the stirring blade to rotate. Although it will move, if a large diameter foreign substance is mixed in the excavated soil and it is caught between the connecting plate and the stirring blade, the connecting plate or stirring blade, etc. May be damaged, and it takes a lot of time to repair it. Further, if the work is performed with a large distance between the stirring blade and the connecting plate, the stirring and mixing performance will be deteriorated and the work will require a considerable time.

Therefore, even in the case of a ground improvement mixing and stirring apparatus provided with a stirring blade and a connecting plate, and also when the interval between the stirring blade and the connecting plate is made as small as possible, The problem is solved in order to prevent foreign matter from being caught between the stirring blade and the connecting plate, and to efficiently perform the shredding of the excavated soil and the stirring and mixing of the shredded excavated soil and the ground improvement material. A technical problem to be solved arises, and an object of the present invention is to solve the problem.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and rotatably pivotally connects a plurality of rotating shafts inserted into the ground to a connecting plate. A tip of the rotating shaft is provided with an excavating blade and a nozzle for injecting a ground improvement material, and further, excavated soil excavated by the excavating blade and a ground improvement material ejected from the nozzle are close to the connecting plate. Is rotated by a stirring blade provided on the ground, and the excavated soil that is rotating and moving is shredded between the stirring blade and the connecting plate adjacent to the stirring blade, and the shredded soil and the ground are cut. In a mixing and stirring apparatus configured to stir and mix an improving material to form a plurality of columnar improved grounds, the connecting plate is formed to be vertically movable with respect to the rotating shaft, and the connecting plate is coiled. A mixing and stirring device for ground improvement that is biased downward by a spring. .

[0007]

The excavation hole is excavated by the excavation blade provided at the tip of the rotating shaft, and the excavated soil generated by the excavating operation is accompanied by the rotation of the stirring blade fixed to the rotating shaft. To rotate and move. At the same time, a ground improvement material such as cement milk is ejected from the tip of the rotating shaft and rotates together with the excavated soil. At this time, since the connecting plate provided in the vicinity of the stirring blade is stopped, the excavated soil that is rotating and moving is shredded between the stopping blade and the rotating stirring blade, and, The shredded soil and the ground improvement material are agitated and mixed to form a cylindrical improved ground.

[0008] Thus, when a foreign substance having a relatively large diameter out of the foreign substances mixed in the excavated soil and being rotationally moved simultaneously with the excavated soil is about to be caught between the stirring blade and the stop blade. When the hardness of the foreign matter is small, the foreign matter is crushed and added to the rotational movement. When the hardness of the foreign matter is large and the foreign matter is not crushed, the foreign matter pushes the connecting plate upward. Thus, the vertically movable connecting plate moves upward against the elastic force of the coil spring, so that the distance between the connecting plate and the stirring blade is increased. Thus, the foreign matter will pass safely between the stop blade and the stirring blade, and the damage to the stirring blade or the connecting plate will be avoided, and the repair work will be unnecessary. Thus,
Since the distance between the stirring blade and the connecting plate can be reduced as much as possible, the efficiency of shredging the excavated soil is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. In the figure, reference numeral 10 denotes a ground improvement mixing and agitating device. As shown in FIG. 1, the ground improvement mixing and agitating device 10 is inserted into the ground by horizontally extending upper and lower connecting plates 11, 11. The rotary shafts 12 and 12 are rotatably mounted and connected. The rotary shafts 12 and 12 are configured to be rotationally driven by a motor (not shown).

Bearings 13, 13, 13, 13 are provided on the connecting plates 11, 11 as shown in FIGS. 1 and 2, and the rotary shaft 12 is inserted into the bearings 13, 13 for rotation. It is supported freely. The rotary shaft 12 on the left side of the drawing rotates right, and the rotary shaft 12 on the right side of the drawing rotates left. The rotary shaft 12 is simply the connecting plates 11, 1.
1 may be loosely fitted.

Further, connecting plates 11, 1 are attached to the rotary shafts 12, 12.
1. Stirring blades 14, 14, 14, 14 are fixedly provided in the vicinity of the lower part of 1, and a step portion is provided on the connecting plate 11, 11 so that adjacent stirring blades 14, 14, 14, 14, 14 come into contact with each other. To prevent. On the other hand, stoppers 15,
15 are formed, and the connecting plate 11 is arranged between the stoppers 15, 15. The interval between the stoppers 15 and 15 is formed larger than the width of the connecting plate 11, so that the connecting plates 11 and 11 are vertically movable. Further, coil springs 16, 16, 16 and 16 are interposed between the upper surfaces of the connecting plates 11 and 11 and the upper stoppers 15 and 15 to urge the connecting plates 11 and 11 downward. .

Further, the upper and lower connecting plates 11, 11 are provided with connecting portions 17, 17. The connecting portions 17 and 17 are shown in FIG.
And, as shown in FIG. 4, the end portion 18 of the one connecting plate 11a.
A long hole 19 extending vertically is opened. Further, the end portion 20 of the other connecting plate 11b is formed in a U-shape, and the end portion 18 of the one connecting plate 11a is inserted into the U-shaped end portion 20. Then, the pin 21 inserted through the long hole 19 is fixed to the end portion 20 of the other connecting plate 11b to connect the connecting plates 11a and 1a.
1b is configured to be able to move up and down relatively.
The relative connecting mechanism between the one connecting plate 11a and 11b should not be limited to the above-mentioned structure, and may be configured to simply move up and down without using the long hole 19 and the pin 21. Good.

Further, as shown in FIG. 1, the rotary shafts 12, 12
Excavation blades 22 and 22 are fixedly provided at the lower end portion thereof, and jet nozzles 23 and 23 for jetting cement milk and the like are provided. Since one embodiment of the present invention has the above-described structure, the rotating shafts 12, 12 are driven to drive the rotating shafts 12, 12.
The excavation blades 22, 22 provided at the lower end of the excavation hole excavate the excavated soil, and the excavated soil generated by the excavation operation is fixed on the rotary shafts 12, 12.
It is rotated by the rotation of 4, 14, 14.

Simultaneously with this, the ground improvement material such as cement milk is jetted from the jet nozzles 23, 23 provided at the tip ends of the rotary shafts 12, 12 and rotationally moves together with the excavated soil. At this time, the stirring blades 14, 14, 14, 1
4, connecting plates 11 and 11 provided as close to each other as possible
And the rotating stirring blades 14 and 14 are shredded, the excavated soil that is rotating and moving is shredded, the mixing and stirring of the cement milk is performed very efficiently, and a good-quality connected cylindrical improved ground is formed. It will be done.

Thus, foreign matter having high hardness such as boulders may be mixed in the excavated soil which is rotating and moving. Among the foreign matters, those having a slightly large grain size are the connecting plate 1
1,1 and the stirring blades 14,14,14,14 tend to be caught. In this case, the foreign matter is the connecting plate 1
The action of pressing 1, 11 upward acts.

In that case, the coil springs 16, 16, 16, 16 provided above the connecting plates 11, 11 are pushed upward against the elastic force. Therefore, the connecting plate 1
1, 1 also suddenly jumps upward, so that the distance between the connecting plates 11, 11 and the stirring blades 14, 14, 14, 14 is increased, and the foreign matter that is about to be caught is the connecting plate 11. , 11a, 11b and the stirring blades 14, 14 ... Are safely mixed and stirred well with the excavated soil and the cement milk which are rotating and moving. Also, the connecting plate 1
Up and down movements of 1 and 11 include left and right connecting plates 11a and 11b
Since the and are individually moved up and down, foreign matter can be smoothly connected to the connecting plate 11,
11 and the stirring blades 14, 14, 14, 14 can be excluded.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0018]

As described in detail in the above-mentioned one embodiment, the present invention is not limited to the connection plate even if foreign matter is caught between the stirring blade and the connection plate during excavation and stirring. Since the foreign matter will pass upward between the stirring blade and the connecting plate, it will not damage the device, and the relatively high viscous stratum or the ground with many foreign matter will not rise. Even in this case, it is not necessary to widen the distance between the stirring blade and the connecting plate, so that the stirring performance is improved, there are few failures, and the workability is improved, which contributes to cost reduction. It is an invention that produces a great effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a ground mixing and stirring apparatus.

FIG. 2 is an enlarged cross-sectional view of a portion where a rotary shaft is pivotally attached.

FIG. 3 is a partially cutaway enlarged side view of a connecting portion.

FIG. 4 is a partially cutaway enlarged plan view of a connecting portion.

FIG. 5 is a side view of a conventional ground improvement mixing and stirring device.

[Explanation of symbols]

 10 Ground Mixing and Mixing Device 11 Connecting Plate 12 Rotating Shaft 14 Stirring Blade 16 Coil Spring 22 Excavation Blade 24 Nozzle

Claims (1)

[Claims] 1. A plurality of rotary shafts to be inserted into the ground are rotatably and pivotally connected to a connecting plate, and a tip of the rotary shaft is provided with an excavating blade and a nozzle for injecting ground improvement material. , The excavated soil excavated by the excavating blade and the ground improvement material ejected from the nozzle are rotationally moved by a stirring blade provided in the vicinity of the connecting plate, and the stirring blade and the stirring blade are in proximity. The excavated soil that is being rotationally moved is shredded between the connecting plate and the shredded soil, and the shredded soil and the ground improvement material are mixed by stirring to form a plurality of columnar improved grounds. In the agitating device, the mixing and agitating device for ground improvement is characterized in that the connecting plate is formed so as to be vertically movable with respect to the rotary shaft, and the connecting plate is biased downward by a coil spring.