JP2004076440A - Mixing agitating device and its use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixing agitating device and its use for preventing the following rotation of earth by excavating wings and the jet injection of a slurry-like soil improver, and creating a strong column by uniformly mixing slurry. <P>SOLUTION: This mixing agitating device is characterized by arranging an excavating shaft formed on the tip of a hollow rod for transferring the slurry of the soil improver, the first excavating wing extending in the diametral direction on the tip side of the excavating shaft and having an excavating blade, a first delivery port arranged under the first excavating wing in the excavating shaft and injecting the pressurized slurry inside the excavating blade arranged on the outside end side of the first excavating wing, the second excavating wing extending in the diametral direction by crossing at an almost right angle relative to the first excavating wing in a position above the first excavating wing in the excavating shaft and having an excavating blade and a second delivery port arranged under the second excavating wing in the excavating shaft and injecting the pressurized slurry inside the excavating blade arranged on the outside end side of the second excavating wing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a deep-layer treatment method in which contaminated soil, soft ground, and the like are mixed and stirred with a soil conditioner and sealed or hardened by using a drilling wing and jet injection of a soil conditioner, without using a stirring blade, and a soil improvement method is performed. The present invention relates to a mixing and stirring device to be used and a method of using the same.
[0002]
[Prior art]
Inject a slurry-like soil improver into the soft ground, mix and stir them with stirring blades, improve the soft ground into a pile or board shape by hardening and consolidation reaction, and use this as the base ground A mixing method is known.
In this method, it is necessary to stir a slurry of the soft soil raw soil and a cement-based solidifying agent to create a column in which hardening and consolidation by hydration reaction with pore water in the soil are uniformed.
Therefore, as a deep mixing stirrer that has an excavating blade and a stirring blade and stirs the soil and slurry, (1) a device in which stationary blades that prevent co-rotation of soil are attached to the stirring device in one or two stages (2) a device for rotating the rotating shaft in the forward and reverse directions, (3) a device in which stirring blades are mounted in multiple stages and the number of repetitions is increased by increasing the number of repetitions by high-speed rotation, and (4) jet stirring. Various devices have been proposed.
[0003]
[Problems to be solved by the invention]
When improving the ground with strong adhesion such as the Kanto loam layer or the conglomerate soil with the conventional deep mixing and agitation device, install a counter-rotating device such as the stationary blade of (1) above and construct it. However, if the weight of the machine body is light, the machine is lifted, and the ground cannot be improved to a predetermined depth.
In addition, there is a disadvantage that the space between the upper part of the stationary blade as a co-rotation prevention device and the lower part of the excavation blade is not improved.
In the case of using the stirrer that can rotate forward and reverse in the above (2), the excavating wing rotates by the rotational force of the motor during normal rotation, but the rotational force of the motor is weak during reverse rotation, In the case of gravel soil, there is a disadvantage that the stirring wing does not rotate sufficiently and an unmodified column is easily formed.
In the device in which the stirring blades of (3) are mounted in multiple stages, even if the rotation speed is set to high-speed rotation, a lump of soil is formed between the stirring blades and the co-rotation phenomenon of the soil occurs. As a result, However, there is a disadvantage that an unmodified column is easily formed.
There is a problem with the jet injection angle when the ground is improved with the device using jet agitation in (4) above, or when the diameter is the same as the excavation diameter, the slurry is directly injected into the vertical piece or the scattering prevention wing. Then, since the area of the vertical piece and the scattering prevention wing is large, when the soil is a conglomerate soil and has strong cohesive strength, the collapse torque of the conglomerate soil may increase.
[0004]
[Problems to be solved by the invention]
The present invention has been proposed in order to solve the above-mentioned various problems of the prior art. The purpose of the present invention is to reduce the co-rotation of soil by excavating wings and jetting a slurry-like soil conditioner. It is an object of the present invention to provide a mixing and stirring device capable of forming a strong column while preventing and mixing the slurry uniformly, and a method of using the same.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the mixing and stirring device of the invention according to claim 1,
A digging shaft formed at the tip of a hollow rod capable of transferring a slurry of the soil conditioner, a first digging wing having a digging blade extending diametrically on the tip side of the digging shaft, and a digging shaft; A first discharge port that is provided below the first digging wing and injects the pressurized slurry into the inside of a digging blade provided on an outer end side of the first digging wing; A second digging wing extending diametrically substantially perpendicular to the first digging wing at a position above the first digging wing and provided with a digging blade; and a second digging wing provided on the digging shaft below the second digging wing. And a second discharge port for injecting the pressurized slurry into the inside of a digging blade provided on the outer end side of the second digging wing.
In the invention of claim 2,
The first digging wing and the second digging wing are composed of a pair of wings extending radially from a digging axis, and a digging blade provided at an outer end of the wing is provided on the same wing. Technical means that it is arranged to be longer and lower than the excavating blade.
[0006]
In the invention of the method for using the mixing and stirring device according to claim 3,
A digging shaft formed at the tip of a hollow rod capable of transferring a slurry of the soil conditioner, a first digging wing having a digging blade extending diametrically on the tip side of the digging shaft, and a digging shaft; A first discharge port that is provided below the first digging wing and injects the pressurized slurry into the inside of a digging blade provided on an outer end side of the first digging wing; A second digging wing extending in a diametrical direction substantially perpendicular to the first digging wing at a position above the first digging wing and provided with a digging blade, and provided below the second digging wing on the digging axis. And a second discharge port for injecting the pressurized slurry into the inside of a cutting blade provided on the outer end side of a second cutting blade.
The slurry pressurized from the first discharge port is injected into the digging diameter of the first digging wing to reduce the digging torque, and the slurry pressurized from the second discharging port is digged into the digging diameter of the second digging wing. To ensure that the soil is cut off, and that the unprocessed soil that could not be processed by the first excavator wing is excavated to form a uniform column. .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the mixing and stirring device of the present invention will be described with reference to the drawings.
The mixing and stirring blade 1 shown in this embodiment is a stirring head attached to the tip of a drilling rod (not shown) that is driven to rotate by an auger, for example, as a known driving means, but is formed integrally with the drilling rod. It may be done.
Then, a supply pipe (not shown) for supplying a slurry of the ground improvement agent into the hollow portion may be connected to the excavation rod and driven, and is used in the same manner as a known method.
[0008]
As shown in FIGS. 1 to 3, the mixing and stirring blade 1 includes a digging shaft 2 attached to a tip of a digging rod driven and rotated by the auger, and a first digging blade 3 attached to the digging shaft. And a second excavation wing 5, and a first discharge port 4 and a second discharge port 6 provided below each of the excavation wings 3, 5.
[0009]
The excavation shaft 2 has a hollow portion communicating with the hollow portion of the excavation rod, and is integrally connected to the excavation rod via a joint 2a at the upper end.
An edge 7 protrudes from a lower end of the excavating shaft 2, and a first excavating blade 3 is provided above the edge 7, and further above the second excavating blade 3, which is orthogonal to the first excavating blade 3. 5 are formed.
[0010]
The first digging wing 3 and the second digging wing 5 are orthogonal to each other with the extending direction with respect to the digging axis 2 being displaced by 90 degrees, but the basic configuration is the same in the case of the present embodiment. I have. That is, the first digging wing 3 and the second digging wing 5 are composed of a pair of wings 3A and 3B, 5A and 5B extending radially opposite each other with the digging axis 2 as a center. , 5A and the other wing portions 3B, 5B are formed so as to intersect at an acute angle with the axis of the excavation shaft 2 and to be opposite to each other about the excavation shaft 2.
[0011]
A plurality of (four in the illustrated example) excavating blades 13 and 15 are respectively attached to the wings 3A and 3B, 5A and 5B, and extend downward in the direction in which the short sides of the wings 3A and 3B, 5A and 5B extend. Protruding.
The excavating blades 13 and 15 have tooth-shaped projections 13a and 15a formed on the respective wings 3A and 3B, 5A and 5B, and have excellent wear resistance and hardness fixed to the tips thereof. It consists of bits 13b and 15b made of cemented metal.
These bits 13b and 15b excavate and crush the soil when the mixing and stirring blade 1 enters the soil.
[0012]
Of the digging blades 13 and 15, digging blades 13 'and 15' for preventing the ground improving agent from scattering are provided on the outer ends of the wings 3A and 3B and 5A and 5B.
These digging blades 13 ′ and 15 ′ are arranged so as to be longer and lower than the other digging blades 13 and 15, and in the illustrated example, the mounting position is shifted downward with respect to the other digging blades 13 and 15. I have.
[0013]
On the other hand, on the excavation shaft 2, below the first excavation wing 3, a first discharge port 4 for injecting a ground improvement agent from the excavation rod through the hollow of the excavation shaft 2 at a high pressure or a medium pressure is provided. Are provided in a pair so as to be able to jet along each of the wing portions 3A, 3B.
Similarly, below the second excavation wing 5, a second discharge port 6 for injecting a ground improvement agent from the excavation rod through the hollow of the excavation shaft 2 at high pressure or medium pressure is provided on each of the left and right wing portions 5 </ b> A. , 5B.
[0014]
Then, the slurry discharged from the first discharge port 4 and the second discharge port 6 is jetted toward the digging blades 13 ′, 15 ′ for preventing scattering and inside the digging blades 13 ′, 15 ′. Since it is shielded, it is not discharged beyond the excavation diameter of the excavation blade.
[0015]
By injecting the slurry from the first discharge port 4 and excavating the soil below the excavation blade 13, the excavation torque can be reduced.
In addition, since the high-pressure / medium-pressure slurry injected from the second discharge port 6 is appropriately mixed with the original soil, for example, when the soil soil is gravel or highly viscous soil, the first excavation wing 3 Even if the excavation by the first discharge port 4 is insufficient, the slurry is injected by the second discharge port 6 and agitated by the second excavating blade, so that a uniform column can be formed.
[0016]
In the above-described embodiment, the configuration in which the stirring blades are provided in the upper and lower stages is shown, but the stirring blades may be provided in three or more stages.
In other words, it goes without saying that various design changes can be made without departing from the scope of the present invention.
[0017]
【The invention's effect】
In the deep mixing and stirring apparatus according to the present invention, the excavating blades may be provided in two stages, upper and lower, and the stirring blades can be eliminated.
In addition, since a first discharge port is provided below the first excavating blade to inject a high-pressure / medium-pressure ground improver, excavation torque can be reduced, and a second discharging blade is provided below the second stirring blade. A discharge port is provided to inject high- and medium-pressure soil conditioners in the same way, so that even when the original soil is strong ground or gravel soil, it can be sufficiently stirred with the slurry, and The surrounding area can be surely cut by jet injection.
The second excavation wing can also exhibit performance in excavating untreated soil that could not be dealt with by the first excavation wing.
In addition, the first and second discharge ports spray the slurry inside the excavating blade provided at the outer end of the first and second excavation blades to block the scattering of the slurry. There is no scattering. As a result, even if there are variations in the geological formations and geology, the formation of a uniform column can be ensured by using the deep mixing apparatus.
[Brief description of the drawings]
FIG. 1 is a front view of a mixing and stirring blade showing an embodiment of the present invention.
FIG. 2 is a part of a plan view of the same.
FIG. 3 is a side view of a mixing and stirring blade.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mixing stirring blade 2 Drilling shaft 3 First drilling wing 3A, 3B A pair of wings constituting a first drilling wing 4 First discharge port 5 Second drilling wings 5A, 5B A pair of wings constituting a second drilling wing 6 second discharge port 7 edge 13 excavating blade 13 'of first excavating wing excavating blade 15 for scattering prevention Excavating blade 15' of second excavating wing excavating blade for prevention of scattering

Claims (3)

An excavation shaft formed at the tip of a hollow rod capable of transferring a slurry of the soil conditioner,
A first digging wing extending diametrically on the tip side of the digging axis and having a digging blade;
A first discharge port for injecting the pressurized slurry provided below the first excavation wing into the excavation blade provided on an outer end side of the first excavation wing on the excavation axis;
A second digging wing extending diametrically substantially perpendicular to the first digging wing at a position above the first digging wing on the digging axis, and having a digging blade;
A second discharge port for discharging the pressurized slurry provided below the second digging wing on the digging shaft into a digging blade provided on an outer end side of the second digging wing; A mixing and stirring device. The first excavator and the second excavator comprise a pair of wings extending radially from the excavation axis,
2. The mixing and stirring apparatus according to claim 1, wherein a digging blade provided at an outer end of the wing is arranged to be longer and lower than other digging blades provided on the same wing. . A digging shaft formed at the tip of a hollow rod capable of transferring a slurry of the soil conditioner, a first digging wing having a digging blade extending diametrically on the tip side of the digging shaft, and A first discharge port that is provided below the first digging wing and injects the pressurized slurry into the inside of a digging blade provided on an outer end side of the first digging wing; A second digging wing extending in a diametrical direction substantially perpendicular to the first digging wing at a position above the first digging wing and provided with a digging blade, and provided below the second digging wing on the digging axis. And a second discharge port for injecting the pressurized slurry into the inside of a cutting blade provided on the outer end side of a second cutting blade.
The slurry pressurized from the first discharge port is injected into the digging diameter of the first digging wing to reduce the digging torque,
Injecting the slurry pressurized from the second discharge port into the digging diameter of the second digging wing to surely perform the diving, and to dig the untreated soil that could not be processed by the first digging wing. How to use the characteristic mixing and stirring device.

Images