JP2021059853A - Construction method and construction device of composite column - Google Patents

Abstract

To provide a composite column homogenized through effectively stirring and mixing hydraulic solidification material liquid and original ground soil.SOLUTION: A delivery port 7 of hydraulic solidification material liquid is arranged at a generally same position where stirring blades 5, 6 of an excavation rod 3 are arranged. A delivery outlet 9 of the hydraulic solidification material liquid is arranged at an excavation head 4, too. A composite column is constructed by changing the positions of the delivery of the hydraulic solidification material liquid when excavating and drawing-up.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and an apparatus for constructing a synthetic column, which provides a homogenized synthetic column by effectively stirring and mixing the hydraulic solidifying material liquid and the raw ground soil in the construction of the synthetic column.

The applicant arranges a columnar hydraulic solidifying material liquid replacement columnar body at the axial center of the soil cement columnar body so that the axial centers thereof substantially coincide with each other, and the hydraulic solidifying material liquid replacement columnar body in the soil cement columnar body. In order to secure and keep the outer diameter of the lime cement constant, the hydraulic solidifying material liquid-substituted columnar body penetrates the soil cement columnar body and projects downward, and the length of the projecting portion is at least 1. Provided is a synthetic column of a soil cement columnar body and a hydraulic solidifying material liquid replacement columnar body characterized by being five times as long (Patent Document 1).

The process of the above invention will be described with reference to FIG. In the figure, 30 is an excavation rod, 31 is an excavation head, 32 is a discharge port for a hydraulic solidifying material liquid provided in the excavation head 31, 33 is a plurality of stirring blades provided in the lower part of the excavation rod, and 34 is. A co-rotation prevention blade provided between the stirring blades 33, 35 is a soil cement columnar body, and 36 is a hydraulic solidifying material liquid replacement columnar body.

In step 1, the center position of the tip of the excavation head 31 is set at the pile center position of the ground (FIG. 6A). Next, in step 2, the excavation rod 30 is gripped by a construction machine (not shown) equipped with an auger motor capable of applying a rotational force and capable of advancing and retreating, and the excavation rod 30 is excavated while rotating in the forward direction. After the lowest position of the lowermost stirring blade 33 of the above reaches the first predetermined depth (the lower end position of the empty excavation portion), the water-hardening solidifying material liquid is discharged from the discharge port 32 of the excavation head 31 and the excavation is continued in that state. (Fig. 6 (b)). The discharge amount of the hydraulic solidifying material liquid is such that the quality of the soil cement to be built satisfies the design required performance.

In the next step 3, when the excavation head 31 reaches a predetermined depth (at the lower end position of the synthetic replacement column to be built) (FIG. 6 (c)), the rotation of the excavation rod 30 and the discharge of the water-hardening solidifying material liquid are continued. While pulling the excavation rod 30 upward. At this time, the rotation direction can be either forward rotation or reverse rotation.

Further, in the next step 4, as shown in (FIG. 6D), the excavation rod 30 is rotated and the water-hardening material liquid is continuously discharged while being pulled up. At this time, the amount of the water-hardening material liquid discharged is increased. Shall fill the space created by pulling up the excavation rod 30 and maintain an amount that does not generate suction (negative pressure).

Further, at the position where the excavation head 31 reaches a predetermined depth, the soil cement columnar body 35 is not formed below the stirring blade 33 at the lowermost end, so that the soil cement columnar body 35 is formed by pulling up from this position. Until then, the portion below the stirring blade 33 of the excavation rod 30 and the hole formed by the excavation head 31 are filled with the hydraulic solidifying material liquid and pulled up, and downward of the hydraulic solidifying material liquid replacement columnar body 36. The protruding portion 36a is formed.

Further, in step 5, as shown in (FIG. 6 (e)), the excavation rod 30 is pulled up to the ground, and the hydraulic solidifying material liquid replacement columnar body 36 is filled to a predetermined top level L to complete the construction.

In the construction process of the synthetic column, when the water-hardening solidifying material liquid discharged from the discharge port 32 of the excavation head 31 and the raw ground soil are agitated and mixed at the time of construction, the co-rotation prevention blade 34 is caused by the ground resistance in the ground. The synchronous rotation with the excavation rod 30 is blocked and the excavation rod 30 is stopped. Further, by installing the co-rotation prevention blade 34 in the vicinity of the stirring blade 33, the soil mass excavated by the lowermost stirring blade 33 can be efficiently shredded.

Therefore, the so-called co-rotation prevention effect is effectively exhibited, and the hydraulic solidifying material liquid and the raw soil are surely agitated and mixed to form a good soil cement columnar body 35.

As a result, the hydraulic solidifying material liquid-replaced columnar body 36 after solidification apparently has a soil cement columnar body 35 integrally formed on the outer periphery thereof to increase the diameter, and the entire hydraulic solidifying material liquid-replaced columnar body 36 is expanded. The increase in the peripheral frictional force of the ground surface and the increase in the vertical bearing capacity of the ground with respect to the hydraulic solidifying material liquid replacement columnar body 36 are realized.

An object of the present invention is to provide a homogenized synthetic column by effectively stirring and mixing a water-hardening solidifying material liquid and a raw ground soil in the construction of a synthetic column. Therefore, in the present invention, a discharge port for the hydraulic solidifying material liquid is formed at substantially the same position as the stirring blade. In this point, in the above invention, the discharge port 32 for the hydraulic solidifying material liquid is provided only in the excavation head 31 connected to the lower end of the excavation rod 31. Further, the stirring blade 33 was provided in the lower part of the excavation rod 30.

Therefore, there is an upper and lower space between the discharge port 32 of the water-hardening solidifying material liquid and the stirring blade 33, and after the water-hardening solidifying material liquid is first discharged into the original ground soil, the stirring blade separates the water-hardening solidifying material liquid from the original ground soil. Was to be stirred and mixed. As a result, the hydraulic solidifying material liquid and the raw soil may not be sufficiently agitated and mixed.

In the method for constructing the synthetic column of the present invention, a water-hardening material liquid discharge port is formed at substantially the same position as the stirring blade, and the water-hardening material liquid is discharged and the stirring blade is used to simultaneously stir and mix with the ground soil. Including the steps to be performed. Therefore, the hydraulic solidifying material liquid and the raw soil can be effectively stirred and mixed, and the synthetic column can be homogenized.

In the synthetic column construction apparatus of the present invention, two discharge ports for the hydraulic solidifying material liquid are formed in order to carry out the above-mentioned synthetic column construction method. Further, when forming the discharge ports at two places, it is possible to switch the discharge position as a one-pipe (one-flow) structure without forming a two-pipe (two-flow) structure. Therefore, the entire device is simplified and its handling is easy.

Japanese Patent No. 6159994

An object of the present invention is to provide a method for constructing a synthetic column and a construction apparatus for constructing a homogenized synthetic column by effectively stirring and mixing the water-hardening solidifying material liquid and the raw ground soil.

In the method of constructing the synthetic column of the present invention that achieves the above object, the excavation rod provided with the stirring blade at the lower portion and the excavating device provided with the excavation head at the lower end of the excavation rod are rotated in the forward direction with the stirring blade. After excavating while discharging the water-hardening material liquid from the discharge port provided at substantially the same position and reaching a predetermined depth, the water-hardening material liquid is discharged from the discharge port at substantially the same position as the stirring blade. It is characterized in that the discharge is stopped, the water-hardening solidifying material liquid is discharged from a discharge port provided in the excavation head, and the excavation device is pulled up while rotating forward or backward (claim 1).

According to the method for constructing the synthetic column of the present invention, the water-hardening material liquid is discharged and the raw ground soil is stirred by the stirring blade at the same time, and the stirring and mixing of the water-hardening solidifying material liquid and the raw ground soil is effective. It is done in. Further, at the time of pulling up, the hydraulic solidifying material liquid is discharged from the excavation head, and the hydraulic solidifying material liquid and the raw soil are mixed again by stirring. Therefore, a homogenized synthetic column can be constructed.

The synthetic column construction device of the present invention that implements the above-mentioned synthetic column construction method includes a stirring blade and a hollow excavation rod provided with a water-hardening solidifying material liquid discharge port at substantially the same position as the stirring blade. , A water-hardening material liquid flow path is provided inside a casing body including an excavation head provided at the lower end of the drilling rod and having a water-hardening material liquid discharge port, and two outlets are provided at the lower end. The flow path pipe in which the shape is formed is rotatably fitted, and the flow path pipe is rotated by a predetermined angle around the two outlets of the flow path pipe to form an outlet of the flow path pipe. A flow port that conforms to the discharge port of the excavation rod and a flow port that communicates with another outlet of the flow path pipe by rotating the flow path pipe by a predetermined angle and communicates with the discharge port of the excavation head. A valve body forming the circulation port of the above is provided (claim 2).

According to the above configuration, an excavation device consisting of an excavation rod and an excavation head is held by a construction machine (not shown) equipped with an auger motor to rotate the excavation rod in the forward or reverse direction, and is hydraulically solidified according to the ground soil or the like. A synthetic column can be constructed by switching the discharge position of the material liquid.

Specifically, by discharging the hydraulic solidifying material liquid from a discharge port provided at substantially the same position as the stirring blade during excavation, the hydraulic solidifying material liquid is discharged and the stirring blade agitates the ground soil at the same time. Will be done. Therefore, it is possible to provide a homogenized synthetic column in which the hydraulic solidifying material liquid and the raw ground soil are effectively stirred and mixed.

Furthermore, by rotating the flow path pipe to discharge the water-hardening material liquid from the discharge port provided in the excavation head and pulling up the excavation rod while rotating it in the forward or reverse direction, the water-hardening material liquid and the ground soil are again used. Stirring and mixing with. Therefore, it is possible to provide a synthetic column with further improved homogenization.

An embodiment of the synthetic column construction apparatus of the present invention is characterized in that a flow path pipe operating portion capable of confirming and changing the rotation position of the internal flow path pipe is provided near the upper end of the excavation rod ( Claim 4).

According to this one embodiment, prior to the construction work, it is possible to easily confirm which discharge port communicates with the flow path of the flow path pipe and, conversely, does not communicate with the flow path of the flow path pipe. it can. Further, it is possible to switch and control the opening and closing of the discharge port during the construction process.

Another embodiment of the present invention is characterized in that a sealing member for blocking the passage of the water-hardening solidifying material liquid is provided between the flow ports of the valve body (claim 5).

According to this one embodiment, the flow of the hydraulic solidifying material liquid between the distribution ports is prevented, and the amount of the hydraulic solidifying material liquid supplied to each discharge port is accurately controlled.

According to the method for constructing the synthetic column of the present invention, a discharge port for the water-hardening material liquid is formed at substantially the same position as the stirring blade, and the water-hardening material liquid is discharged and mixed with the ground soil by the stirring blade. Can be performed simultaneously, and a homogeneous synthetic column can be provided.

Further, according to the synthetic column construction apparatus of the present invention, in order to carry out the synthetic column construction method, a two-pipe (two-channel) structure is used to form two discharge ports for the hydraulic solidifying material liquid. By making it possible to switch the discharge position as a one-pipe (one-channel) structure without doing so, the entire device is simplified and its handling is easy.

It is a schematic vertical sectional view of the construction apparatus of the synthetic column of this invention. 1 is a schematic vertical sectional view of FIG. 1, where FIG. 1A is a schematic vertical sectional view of an excavator, and FIG. 1B is a schematic vertical sectional view of a flow path pipe. It is a front view of a valve body and the tip of a flow path. It is a perspective view of the flow path pipe operation part. It is sectional drawing which shows the switching state of a flow path pipe and a valve body. It is a process drawing of the construction equipment of the synthetic column provided by the applicant.

First, the construction apparatus for the synthetic column of the present invention will be described. The synthetic column construction device of the present invention is formed from the casing body 1 and the flow path pipe 2. Further, the casing body 1 includes an excavation rod 3, an excavation head 4, and a valve body 17, which will be described in detail later.

The excavation rod 3 has stirring blades 5 and 6 provided at a lower portion thereof at a vertical interval and a discharge port 7 for a hydraulic solidifying material liquid at substantially the same position as the stirring blade 6 below the stirring blades 5. In the figure, reference numeral 8 denotes a co-rotation prevention blade.

The excavation head 4 is provided at the lower end of the excavation rod 3 and has a discharge port 9 for a hydraulic solidifying material liquid. A check valve is provided at the discharge port 9 and the discharge port 7 as needed.

In the flow path pipe 2, a flow path 10 for the hydraulic solidifying material liquid is formed inside, and two outlets 11 and 12 are formed at the lower end portion. The outlets 11 and 12 are formed in the vertical direction in the embodiment.

In the present invention, the flow path pipe 2 is rotatably fitted inside the casing body 1.

First, the flow path pipe 2 is fitted from the opening 13 at the upper part of the excavation rod 3 constituting the excavation device 1, and the matching portion 14 formed at the upper part of the flow path pipe 2 is the opening 13 at the upper part of the excavation rod 3. It is adapted to and integrated with.

The flow path pipe 2 is concentrically and rotatably supported by the central portion of the excavation rod 3 and the excavation head 4. Reference numeral 15 in the figure is a bearing.

In the present invention, the valve body 17 is provided around the outlets 11 and 12 of the hydraulic solidifying material liquid formed at the lower end of the flow path pipe 2 as shown in FIGS. 1, 2 and 3.

The valve body 17 is adapted to the height positions of the two outlets 11 and 12 formed in the flow path pipe 2, and is further fitted with a predetermined angle, for example, an angle of 70 degrees in a plan view. 18 and 19 are formed.

The distribution port 18 can communicate with the discharge port 7 provided on the excavation rod 3, and the distribution port 19 can communicate with the discharge port 9 provided on the excavation head 4. It should be noted that this communication is possible as an alternative.

First, looking at the time of digging, by rotating the flow path pipe 2 by a predetermined angle, the flow path 10 and the outflow port 11 of the flow path pipe 2 and the flow port 18 of the valve body 17 are matched. As a result, the hydraulic solidifying material liquid is discharged from the discharge port 7 of the excavation rod 3 (FIG. 5 (a)). On the other hand, the flow path 10 and the outflow port 12 of the flow path pipe 2 and the flow port 19 of the valve body 17 are cut off. As a result, the hydraulic solidifying material liquid is not discharged from the discharge port 9 of the excavation head 4 (FIG. 5 (b)).

Next, looking at the time of pulling up, by rotating (returning) the flow path pipe 2 by a predetermined angle, on the other hand, the flow path 10 and the outflow port 12 of the flow path pipe 2 and the flow port 19 of the valve body 17 are matched. To do. As a result, the hydraulic solidifying material liquid is discharged from the discharge port 9 of the excavation head 4 (FIG. 5 (B)). On the other hand, the flow path 10 and the outflow port 11 of the flow path pipe 2 and the flow port 18 of the valve body 17 are cut off. As a result, the hydraulic solidifying material liquid is not discharged from the discharge port 7 of the excavation rod 3 (FIG. 5 (A)).

In the figure, reference numeral 20 denotes an O-ring of a sealing member formed in the valve body 17 between the flow port 18 and the flow port 19 to prevent the water-hardening material liquid from flowing through.

In the present invention, a flow path pipe operating unit 21 is provided at the upper end of the excavation rod 3 so that the rotation position (switching position) of the internal flow path pipe 2 can be confirmed and operated. As shown in FIGS. 4A and 4B, the flow path pipe operating portion 21 has an operation pin 23 having a horizontally long window hole 22 formed at the upper end of the excavation rod 3 and an internal end fixed to the flow path pipe 2. Is formed by looking through the window hole 22.

For example, the state in which the operation pin 23 is moved to the left side of the window hole 22 ((a) in the figure) is the state in which the hydraulic solidifying material liquid is discharged from the discharge port 7 of the excavation rod 3.

Further, the state in which the operation pin 23 is moved to the right side of the window hole 22 ((b) in the figure) is the state in which the hydraulic solidifying material liquid is discharged from the discharge port 9 of the excavation head 4.

Therefore, prior to the construction work, it is possible to easily confirm which discharge port communicates with the flow path of the flow path pipe, and conversely which discharge port communicates with the flow path of the flow path pipe. Further, it is possible to switch and control the opening and closing of the discharge port during the construction process.

The embodiment of the construction apparatus for the synthetic column of the present invention has been described above. Specifically, the method for constructing the synthetic column of the present invention based on the synthetic column construction apparatus is a hydraulic solidifying material liquid from a discharge port 7 provided at substantially the same position as the stirring blade 6 of the excavation rod 3 at the time of excavation. Is a method of stopping the discharge of the hydraulic solidifying material liquid from the discharge port 7 and discharging the hydraulic solidifying material liquid from the discharge port 9 provided in the excavation head 4 at the time of pulling up.

That is, the method is characterized in that the hydraulic solidifying material liquid is switched and discharged from the discharge port provided at substantially the same position as the stirring blade 6 and the discharge port provided in the excavation head 4 according to the construction process.

Although the embodiments of the construction apparatus of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design does not deviate from the gist of the present invention. Even if there is a change in the above, it is included in the present invention. Further, the above-described embodiments can be combined by diverting the technologies of each other as long as there is no particular contradiction or problem in the purpose and configuration thereof.

1 Casing body 2 Flow path pipe 3 Excavation rod 4 Excavation head 5, 6 Stirring blade 7, 9 Discharge port 11, 12 Outlet 17 Valve body 18, 19 Flow port 21 Flow path pipe operation unit

Claims (4)

While rotating the excavation rod provided with the stirring blade at the lower part and the excavating device provided with the excavating head at the lower end of the excavation rod in the forward direction, the hydraulic solidifying material liquid is discharged from the discharge port provided at substantially the same position as the stirring blade. After excavating while discharging and the excavation head reaches a predetermined depth, the discharge of the water-hardening material liquid from the discharge port at substantially the same position as the stirring blade is stopped, and the water-hardening solidification is performed from the discharge port provided in the excavation head. A method for constructing a synthetic column, which comprises pulling up the excavator while rotating the excavator in the forward or reverse direction while discharging the material liquid. It has a stirring blade at the lower part, a hollow excavation rod provided with a water-hardening material liquid discharge port at substantially the same position as the stirring blade, and a water-hardening material liquid discharge port provided at the lower end of the excavation rod. Inside the casing body including the excavation head, a flow path pipe having a flow path of the water-hardening material liquid and having two outlets formed at the lower end is rotatably fitted, and the flow path pipe is fitted. Around the two outlets, the flow path pipe is rotated by a predetermined angle to match the outlet of the flow path pipe and communicate with the discharge port of the excavation rod, and the flow path pipe. A valve body is provided by rotating the flow path pipe by a predetermined angle to form a valve body that is compatible with another outlet of the flow path pipe and forms another flow port that communicates with the discharge port of the excavation head. Column construction equipment. The synthetic column construction apparatus according to claim 2, wherein a flow path pipe rotating portion capable of confirming and operating an internal flow path pipe rotation position is provided near the upper end of the excavation rod. The synthetic column construction apparatus according to claim 2 or 3, wherein a sealing member for blocking the passage of the hydraulic solidifying material liquid is provided between the flow ports of the valve body.

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