JP2002348852A - Method for preparing solidified treated pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preparing a solidified treated pile capable of realizing the smooth execution of works even when a solidified pile is prepared up to an underground depth such as the preparation of a long-sized solidified pile and the preparation of a splicing-driven solidified pile. SOLUTION: In the method in which a solidifying material is discharged into a ground in the rotating regions of one or more of agitating blades 2 and 2 radially installed to the lower sections of rotating shafts 1 and 1 from solidifying-material discharge pipe ports 31 annexed at the fixed places of the rotating shafts 1 and 1 and agitated and mixed with in-situ soil and the solidified treated pile Z is prepared, the solidifying material is discharged to the lower section Y of a solidified-treated pile preparation region in a penetration process, and discharged to a residual upper section X in the second penetration process after a pull-out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an improved solidified pile which can realize smooth construction when forming a long solidified pile or a solidified pile for joint improvement for improving the ground. It is about.

[0002]

2. Description of the Related Art One of the methods for improving the ground is a method for forming a solidified pile. In this solidification processing pile formation method, for example, as shown in FIG. 4, the tip of a mechanical stirring device 10 is rotated in accordance with the core of a column to be constructed, and the rotating shaft 1 is rotated. The solidified material is discharged from the solidified material discharge pipe port 3 provided at a predetermined position of the rotating shaft 1 into the ground in the rotation range of the one or more provided stirring blades 2a, 2b, while stirring and mixing with the in-situ soil. This is a construction method in which the penetration is performed, the discharge is stopped when the depth reaches the design depth, and the rotating shaft 1 is rotated or reversed as it is, and further pulled out into the ground while stirring and mixing to form a columnar body. In FIG. 4, reference numeral 21 denotes an excavation bit.

Normally, the solidified material is discharged in the penetrating step or discharged in the lifting step. However, in the case of discharging in the penetrating step, the setting position of the solidified material discharge port is equal to or equal to that of the stirring blade. This is convenient in that it may be located at any lower place, and furthermore, the stirring efficiency of the in-situ soil and the solidified material is good.

[0004]

However, in the method in which the solidified material is discharged in the intrusion process, the solidification treatment is carried out deep into the ground as in the formation of a long solidified pile of 40 m or more or the formation of a joint solidified pile. When constructing a pile, the rotating shaft is pulled out after a considerable time has elapsed since the start of discharging the solidified material. In this case, there is a problem that solidification of the first solidified material may start, which makes it difficult to perform the drawing operation.

Accordingly, an object of the present invention is to provide a solidification process capable of realizing a smooth construction even in the case of forming a solidified pile deep into the ground, such as the formation of a long solidified pile or the formation of a solidified pile. An object of the present invention is to provide a method for forming a pile.

[0006]

Under such circumstances, the present inventors have conducted intensive studies, and as a result, first, in the intrusion step, the solidified material was discharged to the lower part of the solidified pile formation area,
Next, if the liquid is discharged to the remaining upper portion in the re-penetration step after the drawing, the stirring blade can be pulled out before the solidified material is solidified while having the advantage of the penetrating discharge, and the smooth construction can be performed. The inventors have found that the present invention can be realized, and have completed the present invention.

That is, according to the present invention, the solidified material is supplied from a solidified material discharge pipe port provided at a predetermined position of the rotary shaft into the ground in a rotation region of one or more stirring blades provided radially below the rotary shaft. A method of forming a solidified pile by stirring and mixing with the in-situ soil, wherein the solidified material is discharged to a lower part of the solidified pile forming area in the penetrating step, and then in the re-penetrating step after drawing. It is an object of the present invention to provide a method for forming a solidified pile discharged to the remaining upper part. By adopting such a configuration, the first solidified material is, for example, about half the length of the solidified pile to be formed, and is the latter half of the penetrating process. Since a relatively short time is required from the time of solidification material introduction, the stirring blade can be pulled out before solidification of the solidification material. On the other hand, the remaining portion is the upper portion of the length of the solidification treatment pile to be formed, for example, about half the length, if only the remaining portion is performed by a normal construction method, the formation of a long solidification pile,
Even in the case where a solidified pile is formed deep into the ground as in the case of forming a consolidated solidified pile, smooth construction can be realized.

Further, according to the present invention, in the re-penetration step, the solidified material is discharged to a lower portion of the remaining upper portion,
Next, the present invention provides a method for forming the solidified pile to be discharged to the remaining upper portion in the re-penetration step after the drawing. By adopting such a configuration, the first solidified material is set to, for example, about 1/3 of the length of the solidified pile to be formed, and is the latter half of the penetration process. Can be completed in a relatively short time from the time of solidification material introduction, and the stirring blade can be pulled out before solidification of the solidification material. On the other hand, in the remaining portion, first, the solidified material has a length of, for example, about 1/3 (about half of the remaining portion) of the length of the solidified pile to be formed, and is the latter half of the re-penetration step. The pulling out of the stirring blade in the portion is relatively short from the time of charging the solidified material in the portion, and the stirring blade can be pulled out before the solidified material is solidified. Furthermore, if the remaining one-third part is carried out by the usual construction method, it is necessary to have a three-penetration process, especially to build a long long solidified pile, and to join the ground surface with a high-voltage electric wire etc. Even in the case of forming solidified piles, smooth construction can be realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for forming a solidified pile according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram for explaining the steps of the method for forming a solidified pile according to the present embodiment, and FIG. 2 is a diagram showing the trajectory of the tip of a rotating shaft in the method according to the present embodiment. Construction example, (B)
FIG. 3 shows an example of forming a solidified pile, FIG. 3 is a diagram showing a trajectory of a tip of a rotating shaft in a conventional method, (A) is an example of forming a long solidified pile, and (B) is a forming of a solidified pile. It is an example.
In FIG. 1, hatched portions 12, 13 and FIGS.
The oblique lines attached to the middle and trajectory indicate that the solidified material was discharged.

[0010] For example, a conventional mechanical stirrer as shown in Fig. 4 can be used in the method of forming a solidified pile according to the present invention. Solidification from the solidified material discharge port 3 provided at a predetermined position of the rotary shaft 1 in the ground in the rotation range of one or more stirring blades 2a, 2b radially provided below the rotary shaft 1 of the construction device 1. The material is discharged and mixed with the in-situ soil to form a solidified pile.

Specifically, the rotary shaft 1 is suspended by a rotary driving machine 7 of the construction equipment so as to be able to move up and down and rotatably, has a round pipe shape, and a passage through which the solidified material flows is formed in the pipe. (Not shown). A plurality of agitating blades 2 are provided below the rotating shaft 1, and a solidified material discharge pipe 3 is provided on the outer periphery of the rotating shaft 1 at the root of the one stirring blade 2 b on the back side in the rotation direction. One end of the solidified material discharge pipe 3 is a solidified material discharge port 31 and the other end is connected to a passage passing through the rotary shaft 1, and this passage is connected to a solidified material supply facility on the ground (not connected). Illustrated).

The solidifying material is not particularly limited, and examples thereof include a powdery ground improvement material and cement milk. The powdery ground improvement material is discharged together with air. Also, the rotating shaft 1
May be, for example, a square pipe shape other than the round pipe. Even if the mechanical stirring device is a single-shaft type having one rotating shaft connected to the rotary drive, the rotating shaft as shown in FIG.
It may be a two-axis book.

Next, a method of forming a long solidified pile will be described. First, the ground 9 is loosened and penetrated while the rotating shaft 1 is rotated in the normal rotation direction by the rotary driving device 7. The solidified material is discharged to the lower part Y of the solidified pile formation area Z in the penetration step. That is, the solidified material is not discharged from the solidified material discharge port 31 from the point A on the ground surface to the point B in the middle of the ground (FIG. 1A). Next, the solidified material is discharged from point B to point C, and the in-situ soil 11 and the solidified material are stirred and mixed. The position of the point B is not particularly limited, and is appropriately determined depending on the growth of the solidified pile. However, it is preferable that the position of the point B is about half of the growth of the solidified pile. After the completion of the first penetration step, the ground is pulled out while rotating the rotating shaft 1 in the normal direction or the reverse direction (FIG. 1B). Next, after the drawing, the solidified material is discharged to the upper portion X of the solidified pile formation region Z in the re-penetration process (FIG. 1).
(C)). That is, the solidified material is discharged from the point E to the point F in the middle of the ground, and the in-situ soil 11 and the solidified material are stirred and mixed. After the completion of the second penetration process, the ground is pulled out while rotating the rotating shaft 1 in the normal rotation direction or the reverse rotation direction, and the formation of the solidified pile is completed (FIG. 1 (D)).

As shown by d to e in FIG. 3A, in the conventional method, after a considerable time has elapsed since the start of the discharge of the solidified material, the rotating shaft was pulled out, and the rotary shaft was first loaded. Solidification of the solidified material may also start, which makes drawing difficult.However, in this example, the solidified material input in the first drawing step is the length of the solidification treatment pile to be formed.
For example, since the length is about half, and the latter half of the penetration process, the withdrawal of the stirring blade in this portion is relatively short from the time of solidification material introduction, and the stirring blade can be withdrawn before solidification of the solidification material. it can. Further, the remaining portion formed in the second penetration step is an upper portion of, for example, about half the length of the solidified pile, and if only the remaining portion is performed by a normal construction method, the length of the long solidified pile is reduced. In the construction, smooth construction can be realized.

Next, a method of forming a piling solidification treatment pile will be described. First, the rotating shaft 1 is
While rotating in the normal direction to loosen the ground and penetrate. The solidified material is not discharged in the initial penetrating process, but is discharged to the lower portion Y of the solidification processing pile formation region Z in the penetrating process after the rotation shaft is added. That is, the solidified material is not discharged from the solidified material discharge port 31 from the point H to the point I in the middle of the ground. The position of the point I is not particularly limited, and is appropriately determined depending on the length of the first rotation shaft and the length of the second rotation shaft to be added. It is suitable in this respect. Then, after the renewal time has passed, J
The solidified material is discharged from point to point K. After the completion of the first penetration process, the ground is pulled out while rotating the rotating shaft 1 in the normal direction or the reverse direction. Next, after the drawing, the solidified material is discharged to the upper portion X of the solidified pile formation region Z in the re-penetration step. That is, the solidified material is discharged from the point O to the point P in the middle of the ground. After the second intrusion step is completed, the rotary shaft 1 is rotated in the normal rotation direction or the reverse rotation direction, the ground is pulled out, and the formation of the solidified pile is completed.

As shown by m to n in FIG. 3B, in the conventional method, the rotation shaft is pulled out after a considerable time has elapsed since the start of the discharge of the solidified material. Solidification of the solidified material may start, which makes drawing difficult.However, in this example, the solidified material introduced in the initial drawing process is, for example, about half the length of the solidified pile to be formed. In addition, since it is a part after the replenishment of the penetrating step, the pulling out of the stirring blade in this part can be performed in a relatively short time from the time of charging the solidified material, and the stirring blade can be pulled out before the solidified material is solidified. Further, the remaining portion formed in the second intrusion step is, for example, about half the length of the solidification treatment pile, and if only the remaining portion is performed by a normal construction method, the formation of the joint solidification pile is also possible. , Smooth construction can be realized.

According to the present invention, in the re-penetration step after the drawing, the solidified material is discharged to the lower part of the remaining upper part, and then the solidified material is discharged to the remaining upper part in the re-penetration step after the drawing. It may be ejected. In this case, the intruding step is repeated three times, and therefore, the solidified material is discharged in three steps, and the injection length (the length of the solidification processing pile formed by discharging the solidified material in one penetration step).
Although it is not particularly limited, it is preferable that each is set to about 1/3 of the growth of the solidified pile, since the construction can be performed smoothly. That is, since the first solidified material is about 1/3 of the length of the solidified pile to be formed and is the latter half of the penetration process, the withdrawal of the stirring blades in this portion is performed by adding the solidified material. The stirring blade can be pulled out before solidification of the solidified material because it can be completed in a relatively short time from the timing. On the other hand, in the remaining portion, first, the solidified material is, for example, 1/3 of the solidified pile length to be formed.
(About half of the remaining part) and the second half of the re-penetration process, the pulling out of the stirring blade in this part is relatively short from the second solidification material charging time, and the solidification The stirring blade can be pulled out before the material is solidified. Furthermore, if the remaining one-third part is carried out by a normal construction method, especially in the case of the formation of a long long solidified pile, or in the case of the formation of a solidified pile with a height restriction on the surface of the ground using a high-voltage electric wire, Smooth construction can be realized. Further, in the present invention, in the case of forming a long long solidified pile, and further, in the case of forming a jointed solidified pile having a height limitation, the intrusion step is performed at least 4 degrees, that is, the solidified material is 4 degrees. The discharge may be performed in the above-described manner.

[0018]

According to the present invention, the formation of long solidified piles,
Even in the case where a solidified pile is formed deep into the ground as in the case of forming a consolidated solidified pile, smooth construction can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining steps of a method for forming a solidified pile according to the present embodiment.

FIGS. 2A and 2B are diagrams showing the trajectory of the tip of the rotating shaft in the method of the present embodiment, wherein FIG. 2A is an example of forming a long solidified pile, and FIG.

3A and 3B are diagrams showing the trajectory of the tip of a rotating shaft in a conventional construction method, wherein FIG. 3A is an example of forming a long solidified pile, and FIG. 3B is an example of forming a joint solidified pile.

FIG. 4 is a diagram showing a tip part structure of a solidification processing pile formation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 2, 2a, 2b Stirring blade 3 Solidification material discharge pipe 31 Solidification material discharge pipe opening 5 Anti-sway plate 7 Rotation drive machine 9 Ground 10 Mechanical stirring construction device (solidification processing pile creation device) 11 Excavated ground 12 Solidification Processing pile (initial development pile) 13 Solidification processing pile (second development pile)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Tanaka 1-57-17, Torocho, Saitama-shi, Saitama (72) Inventor Eiji Watanabe 3-19-8, Oshima, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term (reference) 2D040 AA01 AB05 BB01 BD05 2D049 GA12 GA13 GB05 GC11 2D050 CB08

Claims (2)

[Claims] 1. A solidified material is discharged from a solidified material discharge pipe port provided at a predetermined position of a rotating shaft into the ground in a rotating region of one or more stirring blades radially provided below a rotating shaft, and A method for forming a solidified pile by stirring and mixing with a soil, wherein a solidified material is discharged to a lower portion of a solidified pile formation area in a penetrating process, and then the remaining upper portion is formed in a re-penetrating process after drawing. A method for forming a solidification treatment pile, characterized in that the pile is discharged into the pile. 2. In the re-penetration step after the drawing, the solidified material is discharged to the lower part of the remaining upper part, and then discharged to the remaining upper part in the drawn-out and re-penetration step. The method according to claim 1, wherein the pile is solidified.