JPH038919A - Construction method of soil cement body and earth auger used therefor - Google Patents

Abstract

PURPOSE:To make it possible to construct a homogeneous, stable and strong soil cement body by puring hardening liquid from an optional discharge port of an earth auger having a plurality of discharge ports at axial required intervals top mix with ground earth to stir. CONSTITUTION:An excavation head H is provided to the end of an auger axis 1 of an earth auger A, and a plurality of screw blades 3 and stirring blades 2 are arranged at proper intervals along the axis thereof. After that, discharge ports 4a and 4b are provided to a plurality of positions at axial required intervals and the end of the auger axis 1, and hardening liquid such as cement milk, etc., is discharged through the automatic valve. One to the plural number of torque sensors 6 are provided at axial required intervals of the auger axis 1, and admixture caused by stirring and mixing of the whole of a soil cement wall is confirmed to decide.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of creating a soil cement body in the ground by stirring and mixing excavated earth and sand with a hardening liquid such as cement milk. When excavating a hole in the ground with an earth auger, a hardening liquid such as cement milk is discharged from the tip of the ocher and stirred and mixed with the excavated soil to create a soil cement column, or multiple augers are used in parallel. The present invention relates to an improved construction method for constructing soil-cement-like walls (continuous walls) using a continuous auger such as a triple auger or a six-continuous auger, and an earth auger used in the construction method.

[Conventional technology and problems to be solved] In general, conventional earth augers have an inner hole in the auger shaft as a supply hole for a hardening liquid such as cement I or milk, and a discharge port in the tip of the auger shaft. However, using this to dig a hole in the ground,
When creating soil cement columns, etc. in the ground by stirring and mixing the injection liquid and the ground soil, there are the following drawbacks.

■ Because cement milk, etc. is injected only at the tip of the auger head, it is not possible to sufficiently stir and mix the excavated earth and sand with the injected hardening liquid, such as cement milk, over the entire length of the borehole (e.g. , the soil in the borehole other than the injection point above the auger head is not mixed sufficiently).

Therefore, it is impossible to create homogeneous, stable and strong fill cement columns and walls.

■ Also, the soil cement pillars or walls to be constructed are
The strength of the cement soil body itself, whether it must be built to a predetermined strength or not, is mainly determined by the quality of the excavated soil to be stirred. Therefore, in the ground where the strata change in the depth direction, it is necessary to inject a hardening liquid such as cement milk depending on the soil quality, but as mentioned above, with the conventional method,
Since cement milk, etc. is injected only at the tip of the auger head, it is not possible to inject an appropriate amount into the ground at a predetermined depth, and only a cement soil body with uncertain strength can be created.

■ In addition, in order to improve the above-mentioned mixing effect, stirring and mixing without injecting the curing liquid when pulling up the auger, or stirring and mixing by vertical movement of the auger, is time consuming and difficult, and is still insufficient. However, it has the disadvantage that it cannot be mixed, and furthermore, the distribution of the injection amount of hardening liquid such as cement milk in the depth direction is unclear, making it impossible to create a safe and strong cement fill body.

■ The strength of the soil cement body is mainly determined by the degree of mixing of the injected hardening liquid and the ground soil, in addition to the injection amount and strength of the hardening liquid and the quality of the soil being stirred. The degree of stirring and mixing of the soil cement body to be produced was not checked or controlled at all at the time of construction, and as a result, only soil cement bodies with uncertain strength and non-uniformity could be produced.

``First aspect of the invention'' In view of the above, the present invention uses an earth auger provided with a discharge port that is opened and closed by an automatic valve such as a solenoid valve 1 at a required interval in the axial direction of the auger, especially in a construction method for creating a soil cement body. This is an attempt to solve the above problems.

That is, the object is to provide a construction method that can efficiently and reliably create a soil cement body that is homogeneous, stable and strong over the entire length in the depth direction, and an earth auger that is suitable as a device for implementing this construction method.

[Means for Solving the Problems] In order to solve the above problems, in the soil cement body construction method of the present invention, a plurality of controllable automatic valves such as solenoid valves that open and close at required intervals in the auger axis direction are installed. Using an earth auger with a discharge port, when drilling a specified ground hole, a hardening liquid such as cement milk is injected from the discharge port at an arbitrary position in the hole, and is stirred and mixed with the ground soil to form a pillar made of soil cement. It is characterized by creating soil cement bodies such as bodies or walls.

When the earth auger is a linked auger having a plurality of auger shafts connected in parallel, at least one auger shaft is provided with a plurality of discharge ports as described above.

The second aspect of the present invention is that in the above construction method, one or more torque sensors are provided on the rotation transmission shaft of the deceleration motor or the auger shaft connected to the auger shaft of the earth auger, and when a predetermined ground is excavated, the torque A soil cement body is created from a total of 41 pieces of excavation resistance and/or stirring and mixing resistance using sensors.

The earth auger of the present invention, which is a device used in the above construction method, is characterized in that a plurality of discharge ports are provided at required intervals in the axial direction of the auger and are opened and closed by controllable automatic valves such as solenoid valves. .

The earth auger may be provided with one or more torque sensors for measuring digging resistance and/or stirring and mixing resistance on the rotation transmission shaft of the deceleration motor connected to the auger shaft or on the auger shaft. .

In addition, in the above earth auger, a slip ring is provided on the upper part of the auger shaft including the rotation transmission shaft of the deceleration motor, and a solenoid valve is provided to open and close the discharge port while the auger shaft is rotating. The valve and the torque sensor can be configured to be electrically connected to each other so that they can be opened and closed as appropriate by a control device on the ground.

In addition, in the above earth auger, a double swivel device is provided on the upper part of the auger shaft including the rotation transmission shaft of the deceleration motor, and a hydraulic or pneumatic pressure device is provided to open and close the discharge port while the auger is rotating. into the cylinder,
It can be formed to be able to supply liquid such as oil or air.

[Function] In the method of the present invention described above, an earth auger is used which is provided with a plurality of discharge ports that are opened and closed by controllable automatic valves such as solenoid valves at required intervals in the auger axis direction, so that A hardening liquid such as cement milk can be simultaneously injected and stirred from a plurality of discharge ports at arbitrary positions in the borehole, and mixing can be performed efficiently in the borehole metal body including the upper part of the auger head.

Furthermore, by controlling the opening and closing of the plurality of discharge ports using a controllable automatic valve such as a solenoid valve, the curing liquid can be injected at any position in the depth direction of the borehole, and the curing liquid can be injected at an appropriate position depending on the soil quality. It is possible to inject a certain amount of hardening liquid and stir and mix it.

Furthermore, if an earth auger is used that is equipped with one or more torque sensors on the rotation transmission shaft or ocher shaft of the reduction motor, and the excavation resistance and/or stirring and mixing resistance are measured using the torque sensors. By analyzing the above measurement values, it is possible to judge, confirm, and manage the condition of the ground in the depth direction or the kneading and mixing resistance of the soil cement body before construction, and based on this, It also becomes easy to control opening and closing of the discharge port as appropriate.

In particular, a slip ring is provided on the upper part of the auger shaft, which includes the rotation transmission shaft of the deceleration motor, so that electricity can be transmitted to the solenoid valve and torque sensor provided to open and close the discharge port while the auger is rotating. If you configure
Simultaneously with rotary excavation and rotary stirring action by the auger,
As described above, the stirring mixing resistance applied to the earth auger can be measured.

In addition, a double swivel device is provided on the upper part of the auger shaft including the rotation transmission shaft of the deceleration motor, and oil is supplied to a hydraulic or pneumatic cylinder 0 provided to open and close the discharge port while the auger is rotating. When liquid or air can be supplied, the discharge port can be opened and closed by operating the cylinder.

[Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings together with the apparatus used.

First, the apparatus used in the soil cement body construction method of the first invention will be explained.

FIG. 1 shows a single earth auger (A), in which a well-known drilling head (11) is provided at the tip of an auger shaft (1). A plurality of screw blades (3), stirring blades (2), etc. are arranged at appropriate intervals in the axial direction of the auger shaft (1). The screw blades (3) are used for excavation, and are attached to a portion of the auger shaft (1) at scattered locations.

The auger shaft (1) is provided with a plurality of discharge ports (4a) for discharging hardening liquid such as cement milk, water, etc. at required intervals in the axial direction. There is also a discharge port (4b) at the tip of the auger head.
Or is provided. Normally, the inner hole of the auger shaft (1) is used as a supply channel for hardening liquid such as cement milk, water, etc.
Separately, a supply pipe (8) may be provided inside or outside the auger shaft (1) to feed a hardening liquid such as cement milk.

A hardening liquid such as cement milk is supplied to the earth auger (A) from a supply plant installed on the ground, and the supply amount is measured with a flow meter or the like (not shown).

In addition, each discharge port (4a) of the auger shaft (1) or a supply flow path to the discharge port (4a>), for example, the inner hole of the auger shaft (1), has a ground surface as shown in FIG. 3(a). An automatic valve (5a) such as a solenoid valve that can be electrically controlled to open and close by transmission from The hardening liquid such as cement milk flowing downward through the supply channel is configured to be discharged from the discharge ports (4a) at respective positions.

The automatic valve (5a), for example, as shown in FIG. 3(b),
A spool (54) that can be displaced in a direction orthogonal to the communication hole (52) by a solenoid (53) is provided inside the main body (51) having a communication hole (52). , - It has a through hole (55) that coincides with the communication hole (52) when it is displaced toward the blade side (the state shown in the figure) and separates from the communication hole (52) when it is displaced to the other side, so that it can be removed from the ground. The spool (54) is displaced by the action of the solenoid (53) actuated by electric transmission from the flow hole (
52) That is, the opening and closing of the discharge port (4a) can be controlled.

In addition, as shown in FIG. 3(,l), the automatic valve (4a) is disposed at each discharge port so as to close the inner hole of the auger shaft (1), and the auger shaft (1) If the flow of the cement milk inside is configured to pass through the automatic valve (5a) such as a solenoid valve, the hardening liquid such as cement milk can be flowed downward, to the discharge port (4a), or to both. It can be freely controlled by electrical signals from the ground.

Further, as shown in FIG. 4, the excavation head (II) at the tip of the auger is also provided with a discharge port (4b) and an automatic valve (5b) similar to the above for opening and closing the discharge port (4b).
4b) is configured so that cement milk or the like is discharged from the tip of the head.

In addition, each automatic valve (5a) (5b) such as a solenoid valve has a slip ring (S) installed at the top of the auger shaft (1) so that the opening and closing operations can be controlled by a control device (L) installed on the ground. ) is electrically connected to the control device (L).

This slip ring (S) is shown in FIGS. 6 and 7, for example.
As shown in the figure, there is a column (12) suspended below the deceleration motor (M) and a fixed arm (13) protruding from the column.
), and is provided on the upper part (1a) of the auger shaft (1) including the rotation transmission shaft (11) from the reduction motor (M), and when the auger shaft (1) is rotating, the solenoid valve Electricity can be transmitted to automatic valves (5a) (5b) such as

That is, the slip ring (S) is fixed am (13)
The outer ring (14) supported by the upper part (Ia)
The transmission line (15) from the control device (1,) is loosely fitted in a predetermined position on the outer periphery of the
) is connected to each contact ring (16), and on the other hand, on the outer periphery of the corresponding shaft part, there are contact brushes (16) each connected to an automatic valve (4a) such as a solenoid valve.
7) is arranged, and the ring (
16) are circumscribed and configured to always maintain the connected state even when the auger shaft (1) rotates. Contrary to the above, it is also possible to provide the contact ring on the shaft and the brush on the outer ring.

In addition, as shown in FIG. 5, the discharge ports (4a) (4b)
The automatic valves (5a) and (5b) may be configured to be opened and closed by a cylinder (20) or the like operated by hydraulic pressure such as oil pressure or pneumatic pressure. In this case, for example, an opening/closing lid (21) that can close the discharge ports (4a) (4b) is connected to the output shaft of the cylinder (20), and the opening/closing lid (21) is moved up and down by the movement of the cylinder (20). It is configured to be able to open and close the discharge ports (4a) and (4b) by sliding in the direction.

Further, (22) is a pressure sending pipe for liquid such as oil 5 or air, which is installed in parallel with the auger shaft (1), and this pressure sending pipe (22) is connected to the cylinder (20) and the solenoid valve (2).
3), and an electric signal from the ground activates the solenoid valve (
23) to operate the cylinder (20). (24) is the cover for the cylinder (20) and solenoid valve (23) (25) is the solenoid valve (23)
This is the transmission line to.

In this embodiment, the upper part (1a) of the auger shaft (1)
) includes the slip ring (S) described above and 2 described later.
Both heavy swivel devices (B) will be provided.

That is, transmission to the solenoid valve (23) is performed via the slip ring (S) in the same manner as above.

In addition, pressure of oil, air, etc. is sent to the pressure pipe (22) from a hydraulic pump (Y) installed on the ground or on the construction machine via a hydraulic hose (9) and a double swivel device (B). It is done.

The double swivel device (11) is supported by a strut (12) and a fixed arm (13) suspended below the deceleration motor (M), and is connected to the single shaft (1) of the auger 6 including the rotation transmission shaft (11). It is provided in the upper part (1a), and the auger shaft (1
) is rotating, oil etc. can be sent from the hydraulic pump (Y) and hydraulic hose (9) to the pressure sending pipe (22). That is, as shown in FIG. 8, the main part (old), which is hollow on the inner periphery, is connected to the outer periphery of the upper part (1a), which is a double pipe, through a sealing means (B2) such as an O-ring. The main part (old)
The hose (9) is connected to the upper outer pipe, and one or more flow holes (B4) are provided in the portion corresponding to the hollow part (B3), and a pressure pipe is passed through the pipe. (22).

In this case, liquid such as oil or air can be supplied from the hose (9) to the pressure pipe (24) while the auger shaft (1) is kept rotating.

When installing supply pipes (8) for hardening liquid such as cement milk in parallel, use a double swivel device (13) as shown in Fig. 7439 and connect the supply pipes (8) at the upper part (1a). If you pull it out to the outside, it's fine.

In addition, as shown in Figure 2, the earth auger that excavates the ground is connected to the rotation transmission shaft (11) from the deceleration motor (M).
In the case of a linked auger (R) with multiple augers (A1) connected in parallel, each auger (Al) is basically a single auger (A1) as described above.
It is the same as in case A), but in particular, the stirring blade (2), screw blade (3), etc. attached to the auger shaft (1) do not come into contact with each other when the respective shafts rotate, and are efficiently The positions shall be appropriately shifted in the vertical axis direction to enable mixing.

In addition, in the case of this linked auger (R), each auger (A
For at least one of I), that is, for any one of the plurality of augers or for all the augers, a plurality of discharge ports (4a) (4b) for hardening liquid such as water and cement milk are provided at required intervals in the axial direction, and each outlet (
4a) (4b) includes automatic valves such as solenoid valves (5a) (
5b) or a hydraulic or pneumatic cylinder (20
) and a solenoid valve (23) for controlling the operation thereof.

In addition, the discharge port (4a) provided on the adjacent auger shaft (1)
As for the position (4b), it is effective to leave the ingredients vertically aligned with each other, or to stir or mix the ingredients.

The above-mentioned slip ring (S ) and a double swivel device (13).

Further, when implementing the second construction method of the present invention, one to a plurality of torque sensors (6) are provided at required intervals in the axial direction of the auger shaft (1) in the earth auger (Δ) described above. This torque sensor (6) measures the rotational resistance of the auger shaft at each depth, that is, the stirring and mixing resistance of the ground, by measuring the torque loaded on the auger shaft. This torque sensor (6) consists of a strain/stress measuring type, a torsion angle measuring type, etc., and is of a waterproof sealed type.

9 The aforementioned torque sensor (6) is connected directly to the auger shaft (1).
However, as shown in the figure, a torque ring (7) in which the sensor (6) is embedded can also be fixed to the outer periphery of the auger shaft (1).

A plurality of torque sensors (6) provided in the axial direction of the auger shaft (1) are preferably provided at regular intervals above, including a torque sensor (6) provided on the shaft of one portion of the excavation head.

Each torque sensor (6) is attached to the auger shaft (1)
It is electrically connected to the torque analyzer (T) via a slip ring (S) provided on the upper part of the torque analyzer (T).

In this case, the slip ring (S) is a slip ring (S) for transmitting data to automatic valves (5a) (5b) such as solenoid valves or the solenoid valve (23) of the cylinder (20).
), etc., or separately.

The torque and other measured values measured by the torque sensor (6) are electrically transmitted as analog quantities to the torque analyzer (T) via the slip ring (S), which analyzes the measured values and analyzes the cement soil. 0 The degree of kneading for each depth of the body will be determined, confirmed, and managed.

In the case of the linked auger (R) shown in Figure 2, a plurality of torque sensors (6) shall be provided in the axial direction on any one, several, or all of the auger shafts (1) connected in parallel. , a pick-up ring (S) is provided on the upper part of the auger shaft provided with the torque sensor (6).

For example, the torque sensor (6) can be connected to one auger shaft in the center (1) or two auger shafts on both sides (1) (1).
If it is provided in the soil cement wall, the degree of kneading by stirring, mixing, etc. of the entire soil cement wall to be created can be confirmed and judged from the measured value. In addition, when provided on all of the auger shafts (1) of the linked auger (R), the degree of kneading of the entire wall can be determined, confirmed, and managed with higher accuracy.

Next, a case where the construction method of the present invention is implemented using the above-mentioned apparatus will be described.

As shown in Fig. 10(a), an earth auger (A) equipped with a plurality of discharge ports (4a) (4b) and a torque sensor (6) in the axial direction of the auger shaft (1) is suspended from a construction machine. It is connected to the lowered reduction motor (M) and rotates to drill holes in the specified ground.

In this case, water or thin cement milk (weak in strength) is discharged from the discharge port (4b) of the excavation head (11) at the tip of the auger, and the ground soil and hardening liquid are stirred and mixed while excavating the hole. Sometimes I do.

When a predetermined depth is reached, the automatic valve (5b) at the tip of the excavation head (11) is opened by an electric signal, and the discharge port (4b) is opened.
) to discharge a hardening liquid such as cement milk, and further open an automatic valve (5a) at an appropriate depth in the auger axis direction.
Alternatively, a plurality or all of the automatic valves (5a) located at required intervals in the axial direction are opened, and a hardening liquid such as cement milk is discharged from the discharge port (4a) to agitate and mix the excavated soil and the hardening liquid. Figure (b)].

In this case, due to differences in soil quality, the strength after hardening after mixing with a hardening liquid such as cement milk may be 2 degrees or lower than others, so it may be necessary to increase the strength by increasing the amount of cement milk, etc. Therefore, the automatic valve (5a) located in that stratum is kept open for a longer period of time than other parts, thereby increasing the strength of this part.

Also, during the above stirring and mixing, the auger shaft (1)
A plurality of torque sensors (6) installed in the depth direction measure the rotational resistance loaded on the auger shaft (1), that is, the stirring and mixing resistance of the ground at each depth and each layer during construction, as torque.

The above measured values are transmitted to the torque analyzer (1') via the slip ring (S) and analyzed.

As a result of the torque analysis at each position, such as variations in load resistance, the degree of kneading, or the insufficient amount of cement milk or the like to be injected, etc., are analyzed and determined in the depth direction.

For example, the torque sensor (6) in the drilling head (11)
) indicates the rotational stirring resistance below the barrel side position, and similarly, the torque value measured by the torque sensor (6) on the upper side of the auger 3 (1) indicates the rotational stirring resistance below that position. It shows the resistance, and from the difference between the two, it becomes clear whether it is the stirring resistance between the torque sensors (6) (6).

Therefore, based on this determination result, the automatic valve (5a) at a predetermined depth is arbitrarily controlled to open or close to start or stop injection, and mixing is continued while making adjustments.

In the above, the earth auger (A) may be moved up and down for stirring and mixing.

Once the specified amount of curing liquid has been injected and mixed, the earth auger (A) will be lifted to the ground while continuing to mix. However, if you inject and mix during the lifting process, you will end up with even more homogeneous and stronger soil. A cement column (60) is created.

Usually, reinforcing bars, steel pipe piles, concrete piles, etc. (all not shown) are inserted into the soil cement column (60) while it is still unhardened to create foundation piles. .

4 In addition, when constructing a soil cement wall, instead of the above-mentioned single earth auger (A), use a 3- or 6-shaft auger (R) such as the one illustrated in Figure 2, All you need to do is to use this linked auger (1?) to make a hole in the ground for each block in the wall direction, and then pour, stir, and mix in the same manner as above. Insert and install steel materials such as H steel to complete the wall.

[Effects of the Invention] As described above, according to the construction method of the present invention, by using an asauger equipped with a plurality of discharge ports that are opened and closed by automatic valves, multiple discharge ports can be discharged at any arbitrary position within the hole during ground drilling. Hardening liquid such as cement milk can be injected and stirred at the same time from the discharge port of the auger head, and mixing can be done efficiently throughout the entire borehole, including the upper part of the auger head.Moreover, it uses automatic valves such as solenoid valves that can be freely controlled. By controlling the opening and closing of the plurality of discharge ports, the hardening liquid can be injected at any position in the depth direction of the borehole, and an appropriate amount of hardening liquid can be injected and stirred depending on the soil quality. Since mixing is possible, a homogeneous, stable and strong soil cement body can be efficiently created.

Also, on the rotation transmission shaft or auger shaft of the reduction motor,
In the case where an earth auger equipped with one or more torque sensors is used, and the torque sensors are used to measure the excavation resistance and/or stirring and mixing resistance to a total of A+++, by analyzing the above measurement values, the depth direction is determined. The state of the ground or the degree of kneading and mixing of the soil cement can be determined, confirmed, and managed before construction begins.
Furthermore, since it is easy to wipe the container and control the opening and closing of the discharge port as appropriate, it is possible to reliably produce a container with a soil cement body having a uniform strength.

In particular, a slip ring is provided on the upper part of the auger shaft that includes the rotation transmission shaft of the deceleration motor, and electricity can be transmitted to the solenoid valve and torque sensor provided to open and close the discharge port while the auger is rotating. With this configuration, it is possible to measure the agitation mixing resistance applied to the earth auger as described above at the same time as the rotary excavation and rotary stirring action by the auger. can be smoothly injected into the ground, the above-mentioned construction method of the present invention can be carried out satisfactorily, and the construction time can also be shortened.

Furthermore, a double swivel device is installed on the upper part of the auger shaft including the rotation transmission shaft of the deceleration motor, and when the auger is rotating, a hydraulic or pneumatic cylinder installed to open and close the discharge port is connected to the hydraulic or pneumatic cylinder. Alternatively, if air or the like can be supplied, the discharge port can be opened and closed by operating the cylinder, so the above method can be suitably implemented, and the device becomes simple and robust.
It also has excellent durability.

Therefore, according to the present invention, it is possible to reliably and efficiently create a homogeneous, stable and strong soil cement body over substantially the entire length in the depth direction, and all the drawbacks of the conventional method can be eliminated.

[Brief explanation of the drawing]

The figures show embodiments of the present invention, and FIG. 1 is a 1E side view illustrating a single ass auger, which is a device used in the construction method of the present invention, and FIG. 2 is a front view illustrating a coaxial auger. 3(a) and 3(b) are a partially enlarged sectional view illustrating the discharge port structure and a schematic sectional view illustrating an automatic valve consisting of a solenoid valve, FIG. 4 is a front view of the excavation head portion, and FIG. 5 (a)
and (b) are a partial cross-sectional view and a partial front view illustrating other automatic valve structures, respectively, FIG. 6 is an enlarged front view of the upper part of the auger, FIG. 7 is a cross-sectional view of the slip ring structure, and FIG. The figure is a cross-sectional view showing the structure of the double swivel device, Figure 9 is a cross-sectional view showing a partial modification of the previous figure, and Figures 10 (a) (b) (
c) is an explanatory diagram of the construction state of the present invention. [Description of the first issue] (A)...Earth auger (1υ...Linked shaft auger (A1)...Auger (11)...Drilling head, (1)...8th gar shaft, (11 )... Rotation transmission shaft, (la)... Upper part, (2)... Stirring blade, (3)... Screw blade, (4a) (4b)... Discharge port, (5a) ( 5b
)... Automatic valve such as solenoid valve, (6)... Torque sensor (7)... Torque ring, (8) Supply pipe, (9
)...Hydraulic hose, (20)...Hydraulic or pneumatic cylinder (60)...Soil cement column, (
B)...double swivel device, (L)...control device,
(M)...Deceleration motor (S)...Slip ring, (T)...Torque analyzer, (Y)...Hydraulic pump.

Claims (1)

[Scope of Claims] 1. Using an earth auger equipped with a plurality of discharge ports that are opened and closed by controllable automatic valves such as solenoid valves at required intervals in the auger axial direction, when drilling a predetermined ground, the ground auger can be used at any position within the hole. A method for creating a soil-cement body, characterized in that the soil-cement body is created by injecting a hardening liquid such as cement milk through a discharge port and stirring and mixing it with ground soil. 2. In the method for constructing a soil cement body according to claim 1, one or more torque sensors are provided on the rotation transmission shaft of the deceleration motor or the auger shaft connected to the auger shaft, and when a predetermined ground is excavated, the torque is detected. A method for constructing a soil cement body, characterized by constructing the soil cement body while measuring excavation resistance and/or stirring mixing resistance with a sensor. 3. An earth auger characterized by having a plurality of discharge ports opened and closed by controllable automatic valves such as electromagnetic valves at required intervals in the axial direction of the auger. 4. Drilling resistance and/or stirring,
The earth auger according to claim 3, further comprising one or more torque sensors for measuring mixing resistance. 5. A slip ring is provided on the upper part of the auger shaft including the rotation transmission shaft of the deceleration motor, and a solenoid valve is provided to open and close the discharge port while the auger is rotating, or the solenoid valve and the torque sensor are connected together. 5. The earth auger according to claim 3, wherein the earth auger is capable of transmitting electricity to the earth. 6. A double swivel device is installed on the upper part of the auger shaft, which includes the rotation transmission shaft of the deceleration motor, and when the auger is rotating, oil, etc. 4. The earth auger according to claim 3, wherein the earth auger is capable of supplying liquid, air, or the like.