JPH06146260A - Forming method of columnar body in ground and device therefor - Google Patents

Abstract

PURPOSE:To perform compound stirring-mixing so as to form a ground improving columnar body in the ground by three-dimensionally forming a stirringly mixing territory in the ground through injection of consolidation liquid, and performing three- dimensional stirring-mixing. CONSTITUTION:Consolidation liquid 3 is injected inclinedly downward from the consolidation liquid injection holes 2 of a rotary shaft 1 in the ground 4, and the liquid 3 and the soil of the original ground 4 are stirringly mixed so as to form a columnar body 5 in the ground 4. Then the stirringly mixing territory of the rotary shaft 1 is formed into a nearly cone so as to increase, and at descending the territory is overlapped while moving the territory downward. At this time, when the injecting direction is set inclinedly upward, the stirringly mixing territory is formed into a nearly reverse cone shape so as to increase, and at ascending the territory is overlapped while moving the territory upward. When the injecting direction is set inclinedly up and down or horizontal, stirringly mixing is more effectively performed by the liquid 3 injected in various directions. In addition to the stirring-mixing by injection of the consolidation liquid 3, more compound stirring-mixing can be carried out by stirring by means of stirring parts 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a mountain stop wall, a water stop wall, a foundation pile on the ground, or forming a pillar on the ground for improving the ground. .

[0002]

2. Description of the Related Art Conventionally, a consolidating liquid injection hole for injecting a consolidating liquid in a horizontal direction is provided on an excavation shaft, and the consolidating liquid is horizontally discharged from the consolidating liquid injection hole while excavating on the excavation shaft. Japanese Patent Publication No. 59-16049 discloses a method of forming a pillar on the ground by spraying and mixing the congealing liquid and the soil of the original ground. Further, the excavating shaft is arranged in the casing pipe, the consolidating liquid injection hole for horizontally injecting the consolidating liquid is provided in the excavating shaft, and the ground is excavated by the bit at the tip of the excavating shaft in the casing pipe. A method is known in which a congealing liquid is horizontally ejected from a congealing liquid injection hole to stir and mix the congealing liquid and the soil of the original ground in a casing pipe to form a pillar on the ground. Then, in these conventional examples, since the soil of the original ground and the consolidation liquid are stirred and mixed while horizontally injecting the consolidation liquid from the consolidation liquid injection hole provided in the excavation shaft, the horizontal direction The soil of the original ground is finely sheared by the solidifying liquid sprayed onto the soil, and the solidifying liquid sprayed horizontally by the rotation of the rotating shaft is solidified with the soil of the fine ground sheared by the rotation of the rotating shaft. It is designed to be mixed with a working solution by stirring.

[0003]

However, in the above-mentioned conventional example, since the consolidating liquid is ejected in the horizontal direction, it has the above-mentioned characteristics. Since the mixture is agitated and mixed in the spraying area, 1
The stirring and mixing area in rotation becomes a substantially disc shape, and when considered from the viewpoint of efficient stirring and mixing in the state of the ground and when the excavation axis is descending or rising, horizontal injection or only horizontal injection is sufficient. In some cases, it cannot be said.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a three-dimensional stirring mixture area by the injection of the consolidating liquid. (EN) A method and an apparatus for forming pillars on the ground that can be mixed and can form ground improvement pillars.

[0005]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, a method of forming a pillar in the ground of the present invention is as follows. The consolidation liquid 3 is jetted obliquely downward from the provided consolidation liquid injection hole 2 to stir and mix the consolidation liquid 3 and the soil of the original ground 4 to form the pillars 5 on the ground 4. It is a feature.

Further, in the ground 4, the hardening liquid 3 is jetted obliquely upward from the hardening liquid injection hole 2 provided in the rotary shaft 1 to stir and mix the hardening liquid 3 and the soil of the original ground 4. Then, the pillar 5 may be formed in the ground 4. In addition, the consolidation liquid 3 is sprayed obliquely downward and substantially horizontally from the consolidation liquid injection hole 2 provided in the rotary shaft 1 in the ground 4 to separate the consolidation liquid 3 and the soil of the original ground 4. Stir and mix to the ground 4 and the pillars 5
May be formed.

Further, in the ground 4, the hardening liquid 3 is jetted obliquely upward and substantially horizontally from the hardening liquid injection hole 2 provided in the rotary shaft 1 so that the hardening liquid 3 and the original ground 4 are separated from each other. The pillars 5 may be formed in the ground 4 by stirring and mixing with soil. In addition, the consolidating liquid 3 is obliquely downward and obliquely upward from the consolidating liquid injection hole 2 provided in the rotary shaft 1 in the ground 4.
May be sprayed to stir and mix the consolidation liquid 3 and the soil of the original ground 4 to form the pillar 5 on the ground 4.

Furthermore, the consolidation liquid 3 is sprayed obliquely upward, diagonally downward, and substantially horizontally from the consolidation liquid injection hole 2 provided in the rotary shaft 1 in the ground 4 to form the consolidation liquid 3 and the original liquid. Ground 4
The columns 5 may be formed on the ground 4 by stirring and mixing with the soil. Furthermore, the consolidating liquid 3 in different ejection directions
It is also preferable that they intersect with each other.

It is also preferable to provide a stirring unit 6 on the rotary shaft 1 and stir and mix by the stirring unit 6 in addition to stirring and mixing by the injection of the consolidation liquid 3 that is sprayed while rotating. It is also preferable to provide a stirring unit 6 so as to intersect with the consolidation liquid 3 sprayed obliquely upward or obliquely downward to stir and mix. Further, it is also preferable that the rotary shaft 1 is inserted into the casing pipe 7 and agitated and mixed in the casing pipe 7.

Further, the stirring and mixing apparatus of the present invention comprises a rotating shaft 1
It is characterized in that a consolidating liquid injection hole 2 for injecting the consolidating liquid 3 is formed obliquely downward. A configuration may also be adopted in which a consolidating liquid injection hole 2 for ejecting the consolidating liquid 3 is formed on the rotating shaft 1 obliquely upward. Further, a consolidating liquid injection hole 2 for injecting the consolidating liquid 3 obliquely downward and a consolidating liquid injection hole 2 for ejecting the consolidating liquid 3 in a substantially horizontal direction are formed on the rotary shaft 1. It may be configured.

Further, a consolidating liquid injection hole 2 for injecting the consolidating liquid 3 obliquely upward to the rotating shaft 1 and a consolidating liquid injection hole 2 for ejecting the consolidating liquid 3 in a substantially horizontal direction are provided. It may be configured to be formed. Further, the rotating shaft 1 is formed with a consolidating liquid injection hole 2 for injecting the consolidating liquid 3 obliquely downward and a consolidating liquid injection hole 2 for injecting the consolidating liquid 3 obliquely upward. It is also preferable to have a configuration.

Further, a consolidation liquid injection hole 2 for injecting the consolidation liquid 3 toward the rotary shaft 1 in a substantially horizontal direction and a consolidation liquid injection hole for ejecting the consolidation liquid 3 obliquely downward. It is also preferable that the consolidation liquid injection hole 2 for injecting the consolidation liquid 3 is formed obliquely above 2 and the consolidation liquid injection hole 2. Further, a plurality of types of consolidation liquid injection holes 2 having different injection directions are arranged so that the injection areas of the consolidation liquid 3 from the different consolidation liquid injection holes 2 intersect each other. It is also preferable to

Furthermore, it is preferable that the rotating shaft 1 having the consolidating liquid injection hole 2 for injecting the consolidating liquid 3 at least obliquely upward or obliquely downward is provided with the stirring portion 6. Further, a consolidating liquid injection hole 2 for injecting the consolidating liquid 3 onto the rotary shaft 1 at least obliquely upward or obliquely downward.
It is also preferable that the agitating section 6 is provided so as to intersect the injection area of the consolidation liquid 3 ejected from the consolidation liquid ejection hole 2.

Furthermore, it is preferable that the rotary shaft 1 is inserted into the casing pipe 7.

[0015]

According to the present invention having the above-described structure, the consolidation liquid 3 is jetted obliquely downward from the consolidation liquid injection hole 2 provided in the rotary shaft 1 in the ground 4 to consolidate the consolidation liquid 3. By stirring and mixing the ground and the soil of the original ground 4 to form the pillars 5 on the ground 4, the stirring and mixing region in one rotation of the rotating shaft has a substantially conical shape, and the stirring and mixing region increases. When stirring and mixing while jetting diagonally downward at the time of descending 1, the above-mentioned substantially conical stirring and mixing region moves downward, and the stirring and mixing regions overlap. It will be possible.

In the ground 4, the hardening liquid 3 is jetted obliquely upward from the hardening liquid injection hole 2 provided in the rotary shaft 1 to stir and mix the hardening liquid 3 and the soil of the original ground 4. In the case where the columnar body 5 is formed on the ground 4, the stirring / mixing region in one rotation of the rotation shaft has a substantially inverted conical shape, and the stirring / mixing region increases. When the mixture is stirred and mixed while being sprayed, the above-mentioned substantially conical stirring and mixing region moves upward, and the stirring and mixing regions overlap with each other, which enables efficient stirring and mixing.

In addition, the consolidating liquid 3 is sprayed obliquely downward and substantially horizontally from the consolidating liquid injecting hole 2 provided in the rotary shaft 1 in the ground 4 to separate the consolidating liquid 3 and the original ground 4. Form a columnar body 5 on the ground 4 by mixing with soil with stirring, or
The solidifying liquid 3 is jetted obliquely upward and substantially horizontally from the solidifying liquid injection hole 2 provided in the rotary shaft 1 in the ground 4 to stir and mix the solidifying liquid 3 and the soil of the original ground 4 with each other. Then ground 4
A columnar body 5 is formed, or the consolidating liquid 3 is sprayed obliquely downward and obliquely upward from the consolidating liquid injection hole 2 provided in the rotary shaft 1 in the ground 4 respectively. In the case where the column body 5 is formed on the ground 4 by stirring and mixing the soil and the soil of the original ground 4, the consolidation liquid 3 sprayed in different directions can more effectively perform the stirring and mixing.

Further, in the ground 4, the hardening liquid 3 is jetted obliquely upward, obliquely downward, and substantially horizontally from the hardening liquid injection hole 2 provided in the rotary shaft 1, respectively, and the hardening liquid 3 and the original ground. In the one in which the pillars 5 are formed on the ground 4 by stirring and mixing with the soil of No. 4, the stirring and mixing can be performed by spraying the consolidation liquid 3 in three different directions. The most efficient stirring and mixing can be obtained by selecting the jetting direction of the consolidating liquid 3 depending on the time of descending or ascending.

When the consolidating liquids 3 having different jetting directions intersect with each other, more effective stirring and mixing can be obtained. Further, if a stirring unit 6 is provided on the rotary shaft 1 and stirring and mixing is performed by spraying the consolidating liquid 3 that is sprayed while rotating, more complex stirring and mixing can be obtained by stirring and mixing by the stirring unit 6. .

Further, if the stirring section 6 is provided so as to intersect with the consolidation liquid 3 sprayed obliquely upward or obliquely downward, the stirring and mixing can be performed more effectively. Furthermore, the rotating shaft 1
Is inserted into the casing pipe 7, and when the mixture is agitated and mixed in the casing pipe 7, the obliquely injected congealing liquid 3 and the soil violently collide with the casing pipe 7 to further finely shear the soil. Further, stirring and mixing will be performed.

By adopting the stirring / mixing device having the above-mentioned structure, the above-mentioned operation can be performed with a simple structure.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. 2, 3 and 4 show an example of an apparatus used in the method of the present invention. In this embodiment, a bit 8 is provided at the lower end of a rotary shaft 1 in the embodiment shown in the accompanying drawings.
The bit 8 is a consolidating liquid 3 such as cement milk, a mixed liquid mainly composed of cement milk, and other chemical liquids facing downward.
A lower port 15 is provided for injecting. A consolidating liquid injection hole 2 for injecting a consolidating liquid 3 such as cement milk, a mixed liquid mainly composed of cement milk, or another chemical liquid is provided above the bit 8 below the rotary shaft 1. There is. In the embodiment of FIG. 4, the consolidation liquid injection hole 2 is a consolidation liquid injection hole 2b for injecting the consolidation liquid 3 obliquely downward. Further, in this embodiment, the stirring portion 6 such as the stirring blade 6a and the screw 6b is formed above the consolidating liquid injection hole 2 of the rotary shaft 1. Further, in the embodiment of FIG. 3, the embodiment in which the rotary shaft 1 is multi-axis is shown. In FIG. 3, 9 is a multi-axis device, 10 is a rotating device, and by rotating the rotating device 10, a plurality of rotating shafts 1 are rotated through the multi-axis device 9. Further, the drive device 10 is provided on the lifting body 11, and the lifting body 11 moves up and down along the crawler crane 12. In FIG. 4, reference numeral 13 denotes a consolidating liquid supply hose, which passes from the consolidating liquid supplying device (not shown) through the consolidating liquid supplying hose 13 and the consolidating liquid injection hole 2 and the lower port 9.
The congealing liquid 3 is sprayed from here.

However, using the above-mentioned device, the ground
The pillar 5 is formed in the ground 4, but the pillar 5 to the ground 4 is formed.
The formation of the is performed as follows. Sanawa
Then, it is fixed downward from the lower opening 15 provided in the bit 8.
Rotate the rotary shaft 1 while jetting the liquor 3
Excavate the ground 4. From this lower mouth 15 downward
Agitating the sprayed congealing liquid and the excavated soil in the ground
Mixed. Further, a consolidating liquid injection hole 2 provided on the rotary shaft 1
By injecting the consolidation liquid 3 obliquely downward from b,
Finely shears the excavated soil in the original ground, and at the same time, solidifying liquid
The rotary shaft 1 is jetted downward from the jet hole 2b.
By rotating, the consolidation liquid 3 is sprayed in a substantially conical shape.
As shown in Fig. 5, the stirring and mixing area has a substantially conical shape and is horizontal.
In the case where the rotary shaft 1 rotates while jetting in one direction
The stirring and mixing area is three-dimensional as compared to the substantially disk-shaped stirring and mixing area.
It becomes possible to perform effective stirring and mixing. Special
While descending the rotating shaft 1, tilt from the consolidation liquid injection hole 2b.
By injecting downward to rotate the rotating shaft 1,
Three-dimensional (substantially conical) stirring and mixing area X₁, X₂, X₃…
Is shifted downwards like A, B, C in Fig. 5
So, the stirring and mixing areas overlap each other in the vertical direction.
This means that stirring and mixing will be done. In this case,
In addition, in the case where the rotary shaft 1 has multiple axes, it is shown in FIG.
3D (substantially conical) stirring and mixing area X₁,
X₂, X₃...... Y₁, Y₂, Y ₃...... Z₁, Z₂,
Z₃...... overlaps with each other in the vertical direction
The three-dimensional (substantially conical) agitation and mixing regions are laterally aligned with each other.
Three-dimensionally overlapping, stirring and mixing even more
Will be done well. Stirrer 6 is required
It may or may not be provided, but as shown in Fig. 1, the stirring section
In the case where 6 is provided, the above three-dimensional overlapping
The mixture of the agitated and mixed soil and the caking liquid is further agitated.
It will be stirred in No. 6 and more efficient stirring and mixing will be possible.
It In this case, further, as shown in FIG.
The consolidating liquid 3 is jetted obliquely downward to the position above 6
If the solidified liquid injection hole 2b is provided, it is jetted obliquely downward.
The soil being stirred and mixed by the solidifying liquid
The mixture with the consolidation liquid is further stirred and mixed by the stirring unit 6.
This allows complex agitation and mixing to occur simultaneously.
The stirring and mixing can be performed more effectively. Also, this
The mixture of the soil and the congealing liquid mixed with stirring of
The stirring section 6 of FIG. Figure 8
A sectional view showing the combined state is shown. Thus the purpose
Rotate when stirring and mixing are performed while excavating to the depth
Pull the shaft 1 out of the ground 4. Consolidation liquid 3 when pulling out
Is mixed by stirring while ejecting from the consolidating liquid injection hole 2b.
You may ask. In this way, soil sesame in the ground 4
A pillar in which the soil of the original ground such as a cement and the hardening liquid are mixed.
A body 5 is formed. This pillar 5 may be a single body, or
In the above order, a large number of pillars 5 are continuously formed to form a mountain stop.
Wall, water barrier, or ground improvement.
May be. And, if necessary, a steel pipe or
A structural material such as H-shaped steel may be embedded.

In the above embodiment, an example in which the agitating section 6 is provided on the rotary shaft 1 is shown, but the agitating section 6 may not be provided on the rotary shaft 1. FIG. 8, FIG. 9 and FIG. 10 show still another embodiment of the present invention. In this embodiment, a consolidating liquid injection hole 2 for ejecting the consolidating liquid 3 provided on the rotary shaft 1 is provided.
Is composed of a solidified liquid injection hole 2c for injecting obliquely upward. In this way, when stirring and mixing is performed by using the thing for injecting the consolidation liquid 3 obliquely upward from the consolidation liquid injection hole 2c, the rotary shaft 1 is rotated while ejecting obliquely upward from the consolidation liquid injection hole 2c. By rotating, the congealing liquid 3 is injected in a substantially inverted conical shape, and the stirring and mixing region becomes a substantially inverted conical shape as shown in FIG. 10, and the stirring in the case where the rotary shaft 1 rotates while being ejected in the horizontal direction. Compared to the disk shape, which is a mixed area,
The stirring region becomes three-dimensional and effective stirring and mixing can be performed. In particular, when the rotary shaft 1 is pulled up, it is sprayed obliquely upward from the consolidation liquid spray hole 2c to rotate the rotary shaft 1, so that the three-dimensional (substantially conical) stirring and mixing regions X ₁ , X _{2 are formed.} , X ₃ ... Are shifted upward as indicated by D, E, and F in FIG. 10, so that the stirring and mixing regions are three-dimensionally overlapped with each other in the vertical direction, and stirring and mixing are performed. The stirring unit 6 may or may not be provided as necessary. However, in the case where the stirring unit 6 is provided as shown in FIG. 8, the soil and the solidifying liquid that are stirred and mixed while overlapping three-dimensionally are described above. The mixture of (1) is further stirred by the stirring unit 6, and more efficient stirring and mixing can be performed. In this case, as shown in FIG. 8, if a consolidating liquid injection hole 2c for injecting the consolidating liquid 3 obliquely upward is provided below the stirring portion 6 of the rotary shaft 1, the condensing liquid injection hole 2c will be obliquely upward. By further stirring and mixing the mixture of the soil and the hardening liquid, which is being stirred and mixed by the spraying hardening liquid, by the stirring unit 6, complex stirring and mixing is performed simultaneously. The stirring and mixing can be performed more effectively.

FIG. 11 shows still another embodiment of the present invention. In this embodiment, the consolidating liquid injection hole 2 for injecting the consolidating liquid 3 obliquely downward to the rotating shaft 1 and the consolidating liquid injection hole 2 for ejecting the consolidating liquid 3 in a substantially horizontal direction are provided. What is formed is disclosed. Further, in FIG. 12, a consolidation liquid injection hole 2 for injecting the consolidation liquid 3 obliquely upward to the rotary shaft 1 and a consolidation liquid injection hole 2 for ejecting the consolidation liquid 3 in a substantially horizontal direction. What has formed is disclosed. Further, in FIG. 13, a consolidation liquid injection hole 2 for injecting the consolidation liquid 3 obliquely downward to the rotary shaft 1 and a consolidation liquid injection hole 2 for ejecting the consolidation liquid 3 obliquely upward.
What has formed is disclosed. These FIG. 11 and FIG.
2. As shown in FIG. 13, the jetting direction of the consolidating liquid is a combination of an oblique direction and a horizontal direction or a different oblique direction,
The soil and the consolidation liquid 3 can be mixed and mixed in a complex manner. Even in these examples, the stirring unit 6 may not be provided.

Further, as shown in FIGS. 14 and 15, as the consolidation liquid injection holes 2 for injecting the consolidation liquid 3, the consolidation liquid ejection holes 2a for ejecting the consolidation liquid 3 in the horizontal direction, The rotary shaft 1 may be provided with a consolidation liquid injection hole 2b for ejecting the consolidation liquid 3 obliquely downward and a consolidation liquid injection hole 2c for ejecting the consolidation liquid 3 obliquely upward. In this embodiment, the consolidation liquid supply hoses 13 are respectively connected to the consolidation liquid injection holes 2a, 2b and 2c.
a, 13b and 13c are connected to each other so that the ejection of the consolidation liquid 3 supplied from the consolidation liquid injection holes 2a, 2b and 2c can be independently supplied or stopped. . And in this thing, the state of the ground 4,
Depending on conditions such as when the rotating shaft 1 is descending or ascending, all or any two or one of the above consolidating solution injection holes 2a, 2b, and 2c through the consolidating solution injection hole 2 to the consolidating solution 3 Is to be injected. In this case, the consolidation liquid injection hole 2
Needless to say, the effects described above can be expected by the consolidation liquid 3 injected from each of a, 2b, and 2c. In particular, when the rotating shaft 1 is lowered, the consolidating liquid 3 is stirred and mixed while being sprayed obliquely downward from the consolidating liquid ejecting hole 2b, and in this case, the consolidating liquid ejecting hole 2b is used as necessary.
From above while stirring and mixing the consolidation liquid in a substantially horizontal direction,
When the rotary shaft 1 is raised and pulled up, the consolidating liquid 3 is stirred and mixed while being ejected obliquely upward from the consolidating liquid ejecting hole 2c. Therefore, the method of stirring and mixing while injecting the consolidating liquid in a substantially horizontal direction can be adopted, but the method is not necessarily limited to this. In addition, the ground 4 is soft soil (water content is 10
In the case of viscous soil (more than 0%), the stirrer 3 may be jetted from the stirrer injection hole 2a in a substantially horizontal direction to perform stirring and mixing.

By the way, two or more kinds of the consolidating solutions 3 ejecting from the consolidating liquid ejecting hole 2a, the consolidating liquid ejecting hole 2b, or the consolidating liquid ejecting hole 2c are, for example, G in FIG.
If they intersect as shown in FIG. 5, the consolidating liquids 3 in different ejection directions collide with each other, and more effective stirring and mixing can be performed. When two or more kinds of the consolidation liquid injection holes 2a, 2b, and 2c are provided on the rotary shaft 1, the vertical arrangement relationship can be set arbitrarily. Further, as described above, in order to cause the consolidating liquids 3 in different ejection directions to intersect with each other and collide with each other, FIG.
The arrangement is not limited to the arrangement, but the consolidation liquid injection holes 2a, 2
By arbitrarily arranging two or more of b and 2c in the vertical direction, a combination pattern of various arrangements can be obtained. Needless to say, the stirring unit 6 may be provided or the stirring unit 6 may not be provided in this configuration.

Next, still another embodiment of the present invention will be described with reference to FIG. In this embodiment, the rotary shaft 1 is arranged in the casing pipe 7, and the casing pipe 7 is simultaneously embedded in the ground 4 together with the rotary shaft 1, and the casing pipe 7
Inside, the soil of the original ground and the consolidation liquid 3 are agitated and mixed. In this embodiment, as the consolidation liquid injection holes 2 for ejecting the consolidation liquid 3, the consolidation liquid injection holes 2a for horizontally ejecting the consolidation liquid 3 and the consolidation liquid 3 obliquely downwardly. Although an example in which a consolidation liquid injection hole 2b for injecting the consolidation liquid 3 and a consolidation liquid injection hole 2c for ejecting the consolidation liquid 3 obliquely upward are provided is shown, the consolidation liquid 3 is ejected. As the liquid injection hole 2, a solidification liquid injection hole 2a for horizontally injecting the solidification liquid 3 is provided alone, or a liquid for solidification injection for injecting the liquid for consolidation 3 obliquely downward. The hole 2b is provided alone, the consolidating liquid injection hole 2c for injecting the condensing liquid 3 obliquely upward is provided independently, or these consolidating liquid injection holes 2a, 2b, Any two kinds of 2c may be provided. The solidifying liquid 3 injected from the solidifying liquid injection hole 2 violently collides with the soil of the original ground on the inner wall of the casing pipe 7, and further fine shearing and stirring and mixing are performed. It will be possible to improve the ground. Further, in this case, although the consolidating liquid 3 is ejected from the consolidating liquid injection hole 2 provided in the rotating shaft 1 in a substantially horizontal direction or obliquely downward or obliquely upward, the consolidating liquid on which the surrounding ground is sprayed is ejected. Therefore, a columnar body having the same diameter as that of the casing tube 7 can be accurately formed, and since the surrounding ground does not collapse and collapse, a columnar body with high strength as designed can be formed. Also in this embodiment, the stirring unit 6 may or may not be provided as needed.

In the present invention, the rotary shaft 1 is not limited to the multi-axis type, and may be a single-axis type.

[0030]

As described above, according to the present invention, the consolidation liquid is sprayed obliquely downward from the consolidation liquid injection hole provided in the rotary shaft in the ground to consolidate the consolidation liquid and the ground. Since the pillars are formed in the ground by stirring and mixing with the soil of, the stirring and mixing area in one revolution of the rotating shaft becomes a substantially conical shape, and the stirring and mixing area becomes three-dimensional, and the soil of the original ground and the consolidation liquid With this, it is possible to effectively stir and mix with and form a columnar body with improved soil in the ground. Especially, when stirring and mixing while spraying diagonally downward when the rotating shaft descends, The shaped stirring and mixing region moves downward, and the stirring and mixing regions overlap, which enables efficient stirring and mixing.

In addition, the consolidation liquid is sprayed obliquely upward from the consolidation liquid injection hole provided in the rotary shaft in the ground to stir and mix the consolidation liquid and the soil of the original ground to form a pillar on the ground. In the above, the stirring and mixing region in one rotation of the rotating shaft has a substantially inverted conical shape, and the stirring and mixing region becomes three-dimensional,
It is capable of effectively stirring and mixing the soil of the original ground and the congealing liquid to form a column body with improved ground in the ground, and in particular, it is sprayed diagonally upward when the rotating shaft rises. When stirring and mixing are performed while stirring and mixing, the stirring and mixing regions having a substantially conical shape move upward and overlap, and efficient stirring and mixing is possible.

In addition, the setting liquid is sprayed obliquely downward and substantially horizontally from the setting liquid injection hole provided in the rotary shaft in the ground to stir and mix the setting liquid and the soil of the original ground. Forming a column on the ground, or by injecting the hardening liquid obliquely upward and approximately horizontally from the hardening liquid injection hole provided on the rotating shaft in the ground, the hardening liquid and the original ground. Form a pillar on the ground by stirring and mixing with the soil of
The solidification liquid is sprayed obliquely downward and diagonally upward from the solidification liquid injection hole provided on the rotating shaft in the ground to stir and mix the solidification liquid and the soil of the original ground to form a pillar on the ground. In the formation, the solidifying liquid sprayed in different directions can more effectively perform complex agitation and mixing of the soil of the original ground and the solidifying liquid. A pillar can be formed in the ground.

In addition, the consolidation liquid is sprayed obliquely upward, diagonally downward, and substantially horizontally from the consolidation liquid injection hole provided in the rotary shaft in the ground to stir the consolidation liquid and the soil of the original ground. In the case of mixing to form pillars in the ground, it is possible to perform complex stirring and mixing by injecting the consolidation liquid in three different directions. By selecting the injection direction of the consolidation liquid by the above-mentioned method, the most efficient stirring and mixing can be performed, and a column body with improved ground can be formed.

Further, when the consolidating liquids of different jetting directions are made to intersect with each other, complex stirring and mixing is carried out at the intersecting portions, so that more effective stirring and mixing is carried out, and the quality is further improved. It is possible to form pillars with improved ground. Further, in the case where the stirring shaft is provided with a stirrer and stirring and mixing is performed by spraying the consolidating liquid sprayed while rotating, and stirring and mixing is performed by the stirrer, in addition to obliquely stirring and mixing, By adding agitation and mixing, more complex agitation and mixing can be obtained, and a column with improved ground can be formed with higher quality.

Further, in the case where the stirring section is provided so as to intersect with the consolidation liquid jetted obliquely upward or obliquely downward and the mixture is stirred and mixed, the obliquely jetted stirring and mixing are the same as the stirring and mixing by the stirring section. The more complex agitation and mixing can be obtained by being performed at the position, and the column body with improved ground can be formed with higher quality. Further, in the case where the rotating shaft is inserted into the casing pipe and is agitated and mixed in the casing pipe 7, the columnar body having an accurate shape is not broken by the consolidating liquid jetting the surrounding ground diagonally and the accurate shape of the pillar body is put in the ground. Not only can it be formed, but the consolidating liquid jetted diagonally and the soil violently collide with the inner surface of the casing pipe, further shredding the soil and further stirring and mixing.As a result, the soil is improved to a higher quality. It is possible to form a columnar body.

Further, in the invention of the apparatus according to the present invention, by adopting the constitution as described in the claims,
By forming a pillar on the ground using the apparatus of the present invention, various effects obtained by the above method invention can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state during construction of an embodiment of the present invention.

FIG. 2 is a front view of a part of the device used in the above, which is partially cut away.

FIG. 3 is an overall side view of the above-mentioned partially cutaway.

FIG. 4 is an enlarged sectional view of a main part of the above.

FIG. 5 is an explanatory diagram showing a stirring and mixing region when the consolidating liquid is jetted obliquely downward in the same as above.

FIG. 6 is an explanatory diagram showing a stirring and mixing region in the case where a consolidating liquid is jetted obliquely downward in a multi-axis rotary shaft of the same.

FIG. 7 is a cross-sectional view of another embodiment of the present invention during construction.

FIG. 8 is a cross-sectional view of another embodiment of the present invention during construction.

FIG. 9 is an enlarged cross-sectional view of a main part of an apparatus used in the above.

FIG. 10 is an explanatory diagram showing a stirring and mixing region when the consolidating liquid is jetted obliquely upward in the same as above.

FIG. 11 is a cross-sectional view showing a state in the middle of construction of another embodiment of the present invention.

FIG. 12 is a cross-sectional view of a condition in the middle of construction according to another embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a state during construction of yet another embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a state during construction of yet another embodiment of the present invention.

FIG. 15 is an enlarged cross-sectional view of a main part of an apparatus used in the above.

FIG. 16 is a cross-sectional view showing a state during construction of yet another embodiment of the present invention.

[Explanation of symbols]

 1 Rotation axis 2 Consolidation liquid injection hole 3 Consolidation liquid 4 Ground 5 Column 6 Stirrer 7 Casing pipe

Claims (20)

[Claims] 1. A columnar body on the ground by agitating and mixing the hardening liquid and the soil of the original ground by injecting the hardening liquid obliquely downward from the hardening liquid injection hole provided in the rotary shaft in the ground. A method of forming a pillar in the ground, which comprises forming a pillar. 2. A columnar body in the ground by agitating and mixing the hardening liquid and the soil of the original ground by injecting the hardening liquid obliquely upward from the hardening liquid injection hole provided in the rotary shaft in the ground. A method of forming a pillar in the ground, which comprises forming a pillar. 3. The consolidating liquid and the soil of the original ground are stirred and mixed by injecting the consolidating liquid obliquely downward and substantially horizontally from the consolidating liquid injection hole provided in the rotary shaft in the ground. A method of forming a pillar in the ground, which comprises forming a pillar in the ground. 4. The setting liquid and the soil of the original ground are stirred and mixed by injecting the setting liquid obliquely upward and substantially horizontally from the setting liquid injection hole provided in the rotary shaft in the ground. A method of forming a pillar in the ground, which comprises forming a pillar in the ground. 5. The setting liquid and the soil of the original ground are stirred and mixed by injecting the setting liquid obliquely downward and obliquely upward from the hardening liquid injection hole provided in the rotary shaft in the ground. A method for forming a pillar on the ground, which comprises forming a pillar on the ground. 6. The consolidating liquid and the soil of the original ground are agitated by injecting the consolidating liquid obliquely upward, obliquely downward, and substantially horizontally from the consolidating liquid injection hole provided in the rotary shaft in the ground. A method for forming pillars on the ground, which comprises mixing and forming pillars on the ground. 7. The method for forming a pillar in the ground according to claim 3, wherein the consolidating liquids in different ejection directions intersect with each other. 8. A stirring unit is provided on the rotating shaft, and stirring and mixing is performed by the stirring unit in addition to stirring and mixing by the injection of the consolidating liquid that is sprayed while rotating. A method of forming a pillar on the ground according to any one of claims. 9. The method for forming a pillar in the ground according to claim 8, wherein a stirring section is provided so as to intersect with the consolidation liquid sprayed obliquely upward or obliquely downward and the mixture is stirred and mixed. 10. A rotating shaft is inserted into the casing tube,
The method for forming columns in the ground according to any one of claims 1 to 9, wherein the mixture is stirred and mixed in the casing pipe. 11. An agitating and mixing apparatus characterized in that a consolidating liquid injection hole for injecting the consolidating liquid is formed on the rotating shaft obliquely downward. 12. An agitating and mixing apparatus, characterized in that a consolidating liquid injection hole for injecting the consolidating liquid is formed obliquely upward on the rotary shaft. 13. A consolidating liquid ejecting hole for ejecting the consolidating liquid obliquely downward and a consolidating liquid ejecting hole for ejecting the consolidating liquid in a substantially horizontal direction are formed on the rotary shaft. A stirring and mixing device. 14. A consolidating liquid ejecting hole for ejecting the consolidating liquid obliquely upward and a consolidating liquid ejecting hole for ejecting the consolidating liquid in a substantially horizontal direction are formed on the rotary shaft. A stirring and mixing device. 15. A consolidating liquid injection hole for injecting the consolidating liquid obliquely downward and a consolidating liquid injection hole for ejecting the consolidating liquid obliquely upward are formed on the rotary shaft. Characteristic stirring and mixing device. 16. A consolidating liquid injection hole for injecting the consolidating liquid substantially horizontally to the rotating shaft and a consolidating liquid injection hole for injecting the consolidating liquid obliquely downward and obliquely upward. An agitating and mixing device, characterized in that it is provided with a consolidating liquid injection hole for ejecting the consolidating liquid. 17. A plurality of kinds of consolidation liquid injection holes having different injection directions are arranged such that the injection areas of the consolidation liquid from the different consolidation liquid injection holes intersect with each other. The stirring and mixing device according to any one of claims 13 to 16, which is characterized by the above. 18. The stirring unit is provided on a rotary shaft having a congealing liquid injection hole for ejecting the congealing liquid at least obliquely upward or downward. The stirring and mixing device according to any one of 1. 19. A consolidation liquid injection hole for injecting a consolidation liquid at least obliquely upward or obliquely downward is provided on the rotary shaft, and the consolidation liquid ejected from this consolidation liquid injection hole is ejected. The stirring / mixing device according to claim 18, wherein a stirring unit is provided so as to intersect the area. 20. The stirring / mixing device according to claim 11, wherein the rotating shaft is inserted in the casing pipe.