JP2000054770A - Screw auger boring device, screw auger boring method and reaction force obtaining method of screw auger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate boring work by a screw auger having a screw, and simplify the boring work with the use of a screw auger. SOLUTION: The screw auger boring device includes a screw auger 1 for boring an inner part of the ground. Also, the device includes a driving motor for rotation-driving the screw auger 1 and a driving shaft for transmitting the rotational force of the driving motor to the screw auger 1. The screw auger 1 has a sleeve shaft part 4 into which the driving shaft 3 is inserted and a screw 5 extending over the upper and lower parts thereof while turning around the outer peripheral surface of the sleeve shaft part 4 spirally. Provided on the upper part of the sleeve shaft part 4 is a joint-engagement part 7 which is transmitted with rotational force from the driving shaft 3 and slidable along the driving shaft 3. In a state where the driving shaft 3 is inserted in the sleeve shaft part 4, the screw auger 1 is transmitted with rotational force from the driving shaft 3, thereby allowing boring along the driving shaft 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw auger excavating apparatus and a screw auger excavating method for excavating a screw auger having a helical screw into the ground, and to a method for excavating a screw auger excavated into the ground. The present invention relates to a screw auger reaction force obtaining method for taking a force.

[0002]

2. Description of the Related Art There is generally known a pile press-in / pull-out machine which takes a reaction force from several existing piles and press-fits a new pile or pulls out another existing pile. The pile press-in / draw-out machine is often used mainly for construction or removal of a sheet pile wall. In a sheet pile wall, a large number of sheet piles are continuously pressed into the ground. It is possible to press-fit the next pile with force. Conversely, it is possible to pull out the sheet pile. However, when press-fitting sheet piles, when press-fitting the first few sheet piles, there is no sheet pile previously press-fitted, so for example, a reaction force pile for taking a reaction force is fixed to the ground in advance, and He took the reaction force from the reaction pile and pressed in the first few sheet piles.
Also, when pulling out the last several sheet piles of the sheet pile wall, the above reaction force pile can be used in the same manner.

As the reaction force pile, for example, an excavation rod-shaped one (screw auger) in which a screw extends vertically up and down around a rod may be used. The reaction pile is, like the excavation rod, excavated in the ground and buried in the ground, for example, a rotation drive device for rotating the reaction pile at the tip of the jib of the crane, Attach a reaction force pile attached to the lower end of the rotary drive device, and rotate the reaction force pile with the rotary drive device,
By lowering the tip of the crane's jib, the reaction pile was excavated and inserted into the ground like a drill rod.

[0004]

By the way, when the tip of the jib of the crane is moved up and down, the jib is driven to rotate up and down, so that the tip of the jib moves on an arc. However, in this case, the reaction pile cannot be dug into the ground as described above. Therefore, in the crane, a multi-stage telescopic jib is used, and the jib is shortened in conjunction with rotating the jib up and down so that the reaction pile is lowered almost linearly. I have. However, the operation of such a crane is extremely complicated, and the operation of the crane requires skill and increases tension. In some cases, the excavator rod and the rotary drive unit use a leader, and the excavator rod and the rotary drive unit can be moved up and down along the leader. Should be in a state where the upper end of the reader is supported,
There is no need to perform complicated operations as described above. However, when the rotary drive that needs to supply energy from the outside is movable along the reader, the device is more complicated than when the rotary drive is connected to the tip of the jib. turn into.

The present invention has been made in view of the above circumstances, and has a relatively simple configuration and a screw auger that can be used to excavate a screw auger serving as a reaction force pile into the ground with a simple operation. It is an object to provide an apparatus, a screw auger excavation method, and a screw auger reaction force obtaining method.

[0006]

According to a first aspect of the present invention, there is provided a screw auger excavating apparatus, comprising: a rotary drive unit; a drive shaft driven to rotate by the rotary drive unit; and a rotational drive force transmitted by the drive shaft. A screw auger that is movable along the drive shaft, the screw auger includes a cylindrical tubular shaft portion into which the drive shaft is inserted, and an outer peripheral portion of the cylindrical shaft portion. And a screw extending vertically while spiraling around, and rotation is transmitted from the drive shaft by engaging with the drive shaft inside the cylindrical shaft portion where the drive shaft is inserted. And an engaging portion slidable along the drive shaft is provided.

According to the above construction, the drive shaft is inserted into the cylindrical shaft portion of the screw auger, and the drive shaft and the rotary drive unit are joined to each other. Supported by a supporting device such as a crane. In this state, the tip of the screw auger is abutted against the ground, and the drive shaft is rotated by the rotary drive means to excavate the screw auger into the ground. And when the tip of the screw auger is inserted into the ground, the screw is in a state where it is stuck in the ground, and when the screw auger is rotated, a force is generated to excavate the screw by the screw (in the case of reverse rotation) Generates a force to pull up the screw). At this stage, just by rotating the screw auger, the screw auger digs into the ground by the action of its own weight and the screw. Therefore, even when the vertical position of the drive shaft is fixed, if the drive shaft is rotating, the screw auger receives the rotation of the drive shaft via the engaging portion and rotates to excavate. At the same time, since the engaging portion is movable along the drive shaft, the screw auger digs in the ground while being guided by the drive shaft.

Since there is no need to move the drive shaft up and down, there is no need to move the crane (the crane jib) while the drive shaft and the rotary drive connected to the drive shaft are supported by a crane or the like. . From the above, when excavating the screw auger, there is no need to perform a complicated operation such as vertically lowering the tip of the crane jib corresponding to the excavation speed, and it is possible to excavate the screw auger with easy operation it can. In addition, since the vertical position of the drive shaft can be fixed, the rotary drive device can also be fixed, and since the drive shaft functions as a reader, a reader is not necessary and the drive shaft rotates along with the reader. There is no need to move the drive up and down. Therefore, the structure of the earth auger excavation device can be simplified.

According to a second aspect of the present invention, there is provided the screw auger excavating device, wherein the screw auger is a pile for taking a reaction force from the ground, and the screw auger is inserted at an upper end portion of the screw auger inserted into the ground. An auger-side joining means joined to the upper end of the drive shaft inserted therein is provided, and an axial-side joining means joined to the auger-side joining means is provided at the upper end of the drive shaft. It is characterized in that a connection is provided which is connected to a device which operates with force.

[0010] According to the above configuration, after the screw auger is dug into the ground and inserted into the ground as described above, the drive shaft is lowered into the cylindrical shaft portion of the screw auger, and the auger-side joining is performed. Means and the shaft side joining means,
When the screw auger is connected to the drive shaft, the connecting portion of the drive shaft is fixed to the upper end of the screw auger. This makes it possible to connect a device that operates on the upper end of the screw auger by taking a reaction force from the ground to the connection portion, and the screw auger can be used as a reaction force pile. In this case, since the drive shaft is housed in the screw auger, it is not necessary to store the drive shaft in another place. When removing the reaction pile after using the reaction pile, release the joint between the drive shaft and the screw auger, pull up the drive shaft without completely removing it from the screw auger, and rotate again. The screw auger can be pulled out by connecting the drive shaft to the drive means and rotating the drive shaft in the opposite direction. That is, when pulling out the screw auger, it is not necessary to take out the stored drive shaft once and set it in the screw auger.

A screw auger excavating method according to claim 3 of the present invention is a screw auger excavating method using the screw auger excavating device according to claim 1 or 2, wherein With the drive shaft inserted, the tip of the screw auger is pushed up to the ground, and the drive shaft is rotated by the rotary drive means, thereby rotating the screw auger and excavating the ground with the screw of the screw auger. Inserting the screw into the ground as described above, at the stage where the force for excavating the screw auger by the screw by rotating the screw auger is generated, the vertical position of the drive shaft is almost fixed, and the excavating force The screw auger is moved forward with respect to the drive shaft. According to the above configuration, the same operation and effect as the first aspect can be obtained.

According to a fourth aspect of the present invention, there is provided the screw auger reaction force acquiring method using the screw auger excavating apparatus according to the second aspect, wherein the cylinder of the screw auger is provided. With the drive shaft inserted into the mold shaft, the tip of the screw auger is pushed up to the ground, and the drive shaft is rotated by the rotary drive means, thereby rotating the screw auger and the screw of the screw auger. Inserting the screw into the ground so as to dig the ground, at the stage where the force to excavate the screw auger by the screw by rotating the screw auger, almost fixed the vertical position of the drive shaft, The screw auger is advanced with respect to the drive shaft by the excavating force, and the screw auger is grounded. The drive shaft is lowered into the screw auger and inserted in the screw auger, and the screw auger and the drive shaft are joined by the auger-side joining means and the shaft-side joining means. It is characterized in that a device operating by taking a reaction force is connected. According to the above configuration, the same functions and effects as the first and second aspects can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screw auger excavating apparatus, a screw auger excavating method and a screw auger reaction force acquiring method according to an embodiment of the present invention will be described below with reference to the drawings. In this example, an example in which the screw auger 1 is applied as a reaction force pile will be described. However, the screw auger 1 is not limited to the reaction force pile, and can be applied as a drill rod. 1 and 2
FIG. 3 shows a screw auger excavating device set in a crane of this example, FIG. 3 shows a screw auger excavating device with a drive motor 2 removed, and FIG.
5 and 6 show the structure of the upper end of the drive shaft 3, FIG. 7 shows a horizontal cross section of the screw auger 1 with the drive shaft 3 inserted, and FIG. FIG. 9 shows the upper end of the drive shaft 3.

As shown in FIGS. 1 and 2, the screw auger excavating device comprises a screw auger 1 which is dug into the ground and inserted into the ground, a drive motor 2 for rotating and driving the screw auger 1, and a drive motor. And a drive shaft 3 for transmitting the rotational force of 2 to the screw auger 1.
As shown in FIGS. 3 and 7, the screw auger 1 includes a cylindrical tubular shaft portion 4 into which the drive shaft 3 is inserted, and a vertical shaft while spirally rotating around the outer peripheral portion of the tubular shaft portion 4. It has a screw 5 extending across. The cylindrical shaft part 4
A tip excavation part 6 having a conical shape with the tip closed and the tip pointed downward is attached to the tip of the. In addition, while the screw 5 is formed from this tip excavation part 6, at the tip excavation part,
The width of the screw 5 is reduced. At the upper end of the cylindrical shaft portion 4, a joining engagement portion 7 whose outer peripheral side is a joining means with the drive shaft 3 and whose inside is an engagement portion to which rotational force is transmitted from the drive shaft 3. Is provided.

The joint engaging portion 7 has a conical outer surface, a lower end having a diameter substantially equal to the diameter of the cylindrical shaft portion 4, and an upper end which is thicker than the cylindrical shaft portion 4. The upper end 3 has substantially the same diameter as the joint 8. And, the above-mentioned joint engaging portion 7 is provided with a conical outer peripheral plate 9 (shown in FIG. 3).
And a flange plate 10 (shown in FIG. 8) formed so as to close the upper surface of the outer peripheral plate 9, and a central portion of the outer peripheral plate 9 communicates with the cylindrical shaft portion 4. The outer peripheral plate 9, the flange plate 10, and the cylindrical portion 11 are joined to each other by welding or the like, and the cylindrical portion 11, the outer peripheral plate 9, and the cylindrical shaft portion are provided. 4 are joined by welding or the like.

As shown in FIG. 3, slits 9a are formed at substantially 90 degrees every four sides of the outer peripheral plate 9 of the joint engaging portion 7.
Are formed, and as shown in FIG.
Are also formed in the flange plate 10 at positions corresponding to the slits 9a. Further, two side plates 12, 12 are provided from the cylindrical portion 11 in four directions to correspond to the slits 9a, 10a.
(Illustrated in FIG. 5 and the like, and in FIG. 5, the outer peripheral plate is not shown). The side plates 12, 12 have their inner edges joined to the outer peripheral surface of the cylindrical portion 11, and their outer edges joined to the inner peripheral surface of the outer peripheral plate 9. Since the positions of the slits 9a and 10a correspond to the positions of the two side plates 12 and 12 arranged in four directions, the space between the side plates 12 and 12 is opened at the slits 9a and 10a. It has a groove shape.

A connection pin 13 is provided between the side plates 12, 12 and is rotatably supported by the two side plates 12, 12. Note that the connection pins 13 are two side plates 1
The two side plates 1 are provided by pins arranged horizontally between
Pins 2 and 12 are rotatably connected to each other so as to be rotatable up and down. The connection pins 13 are provided on four sides, that is, two side plates 12, 1 arranged at four locations.
8, the connection pins 13 are shown only at one position. The distal end of the connection pin 13 has a male screw shape and is screwed with a nut (not shown) so that the connection pin 13 can be connected to the connection portion 8 of the drive shaft 3 as described later. Has become. As shown in FIG. 5 and FIG. 6, the cylindrical portion 11 has an engaging portion C formed of four engaging plates 14 inside. In addition, the cylindrical part 11 is the cylindrical shaft part 4.
And can be regarded as a part of the cylindrical shaft portion 4. In the engaging portion C, two engaging plates 14 are arranged on the inner peripheral surface of the cylindrical portion so as to face each other, and the engaging plates 14
... are arranged at right angles to each other.

Then, these four engagement plates 14...
The drive shaft 3 in the form of a quadrangular prism in the space surrounded by
Are inserted, and the four surfaces of the drive shaft 3 are
4, the drive shaft 3 is substantially fitted to the four engagement plates 14, and when the drive shaft 3 rotates, the engagement plates 14 are joined. The rotated cylinder 11 rotates, and the screw auger 1 having the cylindrical shaft 4 joined to the cylinder 11 rotates. In addition, a concave portion is formed in a portion corresponding to the engaging plate 14 on the inner surface of the cylindrical portion 11 to which the engaging plate 14 is joined, and the engaging plate 14 fits into the concave portion. A spacer 15 is arranged between the mating plate 14 and the cylindrical portion 11. Also,
Two bolts 16, 16 penetrating the cylinder 11 are vertically joined to the engagement plate 14, so that the engagement plate 14 can be fastened from outside the cylinder 11 by nuts 17, 17. I have. Further, between the nuts 17, 17 and the cylindrical portion 11, the surface on the cylindrical portion 11 side is an arc-shaped curved surface corresponding to the outer peripheral surface of the cylindrical portion 11, and the surface on the nut 17, 17 side is a flat surface. The washer member 18 is disposed. On the inner surface of the engagement plate 14, the four engagement plates 14 are fitted along the drive shaft 3 in a state where the four engagement plates 14 Sliding plate 19 for reducing the frictional force when sliding
Is provided.

As shown in FIGS. 1 and 2, the drive motor 2 is connected to the tip of a jib 21 of a crane 20. The crane 20 is not limited to the one shown in FIG. 2, but can be connected to the drive motor 2, and can support the screw auger excavation device in an upright state via the drive motor 2, and to some extent Anything that can be moved up and down is good.
Further, the drive motor 2 may be a hydraulic motor or an electric motor. The drive shaft 3 is formed in the shape of a quadrangular prism as described above, and is in a state where four corners are chamfered as shown in FIG. 5. When the drive shaft 3 is inserted into the cylindrical shaft portion 4, Since the corner is chamfered, the drive shaft 3 that is thicker than the corner does not hit the inner peripheral surface of the cylindrical shaft portion 4 can be inserted into the cylindrical shaft portion 4. As shown in FIG. 4, a device that operates by taking a reaction force from the ground, for example, a well-known pile press-in / pull-out machine and a drive motor 2 are connected to the upper portion of the drive shaft 3. A joint connection 8 is provided.

As shown in FIGS. 4 and 9, the joining and connecting portion 8 includes a circular bottom plate 22, an H-shaped steel (I-shaped steel) 23 erected in the shape of the bottom plate 22, and a periphery of the bottom plate 22. And a rib 24 provided. In the bottom plate 22,
The drive shaft 3 is fixed by welding or the like with the upper end thereof penetrating. As shown in FIG. 9, four slits 22a are formed on the outer periphery of the circular bottom plate 22 along the radial direction at substantially equal intervals. Also, slit 2
2a are open on the outer peripheral side of the bottom plate 22. When the joint pins 13 of the joint engaging portion 7 of the screw auger 1 are rotated upward, the upper portions of the joint pins 13 are slits 2a.
2a. If a nut or the like is screwed into the joining pin 13 from above in this state, the drive shaft 3
The bottom plate 22 of the joint connecting portion 8 and the joint engaging portion 7 of the screw auger 1 are joined to join the screw auger 1 and the drive shaft 3 inserted in the screw auger 1. The H-shaped steel 23 is also joined to the upper surface of the bottom plate 22 by welding or the like. Then, the H-shaped steel 23 is connected to the pile press-in / pull-out machine in a state where it is gripped by the pile press-in / pull-out machine in the same manner as the existing sheet pile. Therefore, H
The section of the shape steel 23 has a shape corresponding to the pile press-in / pull-out machine, and may have another shape corresponding to the model of the pile press-in / pull-out machine or the model of the device that takes a reaction force from another ground. .
Further, a pin hole 23a is provided in the upper part of the H-shaped steel 23 as shown in FIG. The screw auger 1 and the drive shaft 3 are joined together as follows.
The joint 7 of the screw auger 1 and the drive shaft 3
However, the present invention is not limited to the joining using the joining pin 13 with the joining connecting portion 8. For example, the upper end of the screw auger 1 and the upper end of the drive shaft 3 are each formed with a flange or the like to form a bolt or the like. The screw auger 1 and the drive shaft 3 may be joined together, or the screw auger 1 and the drive shaft 3 may be joined together by passing a pin or the like through both the screw auger 1 and the drive shaft 3 to join the screw auger 1 and the drive shaft 3. It is only necessary that the shaft 3 can be detachably joined with the required strength. In this case, the portions of the screw auger 1 and the drive shaft 3 that are joined by bolts and pins serve as auger-side joining means and shaft-side joining means, respectively.

Next, a screw auger excavation method using the screw auger excavation device having the above-described configuration will be described. First, as shown in FIG. 4, the drive shaft 3 is inserted into the cylindrical shaft portion 4 of the screw auger 1, and the connection pin 13 of the joint engaging portion 7 provided at the upper end of the screw auger 1 is not shown. As shown in FIG. 3, the joint engaging portion 7 of the screw auger 1 and the joint connecting portion 8 of the drive shaft 3 are joined using a nut. Also, as shown in FIG. 1, the drive motor 2 is connected to the tip of the jib 21 of the crane 20, and the H-shaped steel 23 of the connection portion 8 of the drive shaft 3 connected to the screw auger 1 is connected to the drive motor 2. Then, the screw auger excavating device is suspended by a crane.

In this state, the screw auger 1 is rotated by the drive motor 2, the screw auger 1 is moved downward by the jib 21 of the crane 20, the ground is excavated by the screw auger 1, and the screw auger 1 is rotated. The tip is in a state where it is hard to enter the ground. Then, the joining between the screw auger 1 and the drive shaft 3 is released. The joining may be released before the excavation by the screw auger 1 is started. Next, when the lower portion of the screw 5 of the screw auger 1 has entered the ground, the operation of the crane 20 to lower the tip of the jib 21 is stopped, and the drive motor 2 and the drive shaft 3 are set up. Hold in place and do not move up or down. Then, the screw auger 1 is further rotated by rotating the drive motor 2. At this time, the rotational force of the drive motor 2 is transmitted from the drive shaft 3 to the screw auger 1 by the engagement portion C fitted to the square pillar-shaped drive shaft 3. At this time, the engaging portion C
The drive shaft 3 is movably fitted along the drive shaft 3.

Therefore, as described above, the screw auger 1
In a state in which the screw augment is continued, the screw 5 that is inserted into the ground generates a force for excavating the screw auger 1 into the ground, and only the screw auger 1 moves forward with respect to the drive shaft 3. That is, in this state, it is not necessary to operate the jib 21 of the crane 20 in accordance with the excavation of the screw auger 1, and the operation of the crane 20 during excavation of the screw auger 1 can be made extremely easy. In this case, the drive shaft 3 functions as a leader, but since the drive shaft 3 connected to the drive motor 2 does not move up and down as a leader, the drive motor 2 also moves up and down. However, since the drive motor 2 which needs to supply energy from the outside is still connected to the tip of the jib 21, the drive motor 2 is moved with respect to the tip of the jib 21, 2 does not require a configuration for supplying energy, and the configuration of the screw auger excavation device can be simplified. And
As shown in FIG. 2, the screw auger 1 digs in the ground with the drive shaft 3 as a leader, and a state where most of the screw auger 1 is inserted into the ground,
The ground is excavated by the screw auger 1. In this state, if the drive shaft 3 is rotated in the reverse direction, the screw auger 1 can be pulled up.

Next, a method for obtaining a screw auger reaction force using a screw auger excavating device will be described. First, the screw auger 1 is buried in the ground as shown in FIG. 2 in the same manner as in the screw auger excavation method. Next, the drive shaft 3 is lowered into the screw auger 1 buried in the ground so that almost the entire drive shaft 3 is inserted into the screw auger 1. In this case, the drive shaft 3 may be lowered by operating the jib 21 of the crane 20, or the connection between the drive shaft 3 and the drive motor 2, that is, the connection between the drive shaft 3 and the jib 21 may be released. Alternatively, the drive shaft 3 may be lowered. The jib 21
When the drive shaft 3 is lowered by operating the
However, the operation can be easily performed as compared with the operation of the jib 21 corresponding to the excavating speed of the screw auger 1.

When the drive shaft 3 is separated from the jib 21, the drive shaft 3 may be hooked on a wire that can be hung from the jib 21 and then the drive shaft 3 may be lowered.
Then, after the drive shaft 3 is lowered into the screw auger 1, the screw auger 1 and the drive shaft 3 are joined again as described above. As a result, the H-shaped steel 23 of the drive shaft 3 is fixed to the screw auger 1, and the H-shaped steel 23 is gripped (coupled) by a device such as a pile press-in / pull-out machine that operates by taking a reaction force from the ground, The reaction force can be taken from the screw auger 1. Although the screw auger 1 is buried in the ground by digging in the ground, a large reaction force can be obtained by the screw 5 of the screw auger 1. In addition, the drive shaft 3 functioning as a transmission means for transmitting the rotational force to the screw auger 1 and the drive shaft 3 functioning as a leader is connected to the screw auger 1 again and used as a part of the reaction force pile, so that the drive shaft 3 is used. When taking the reaction force from the screw auger 1, there is no need to store it in another place, and when the screw auger 1 is pulled out after the work performed by taking the reaction force from the screw auger 1, When the drive shaft 3 is pulled out of the screw auger 1 and pulled out while rotating the screw auger 1 in the reverse direction, the screw auger 1 can be used immediately as a transmission means and a leader. Therefore, the drive shaft 3 is not obstructed, and workability can be improved.

[0026]

According to the screw auger excavating apparatus, the screw auger excavating method and the screw auger reaction force acquiring method of the present invention, even if the rotary driving means is connected to the tip of the crane jib, the screw can be easily operated. Augers can be dug into the ground. Further, the screw auger and the drive shaft can be used as a reaction force pile, and a reaction force can be taken therefrom to operate a device requiring a large reaction force.

[Brief description of the drawings]

FIG. 1 is a view showing a screw auger excavating device according to an embodiment of the present invention and explaining a excavating process.

FIG. 2 is a drawing showing the screw auger excavating device of the above example and explaining the excavating process.

FIG. 3 is a side view showing the screw auger excavating device without the drive motor of the above example.

FIG. 4 is a side view showing a drive shaft of the screw auger excavating device of the above example.

FIG. 5 is a sectional view taken along the line AA of FIG. 3;

FIG. 6 is a sectional view taken along the line BB of FIG. 5;

FIG. 7 is a horizontal sectional view of a screw auger portion of the screw auger advancing device of the above example.

FIG. 8 is a plan view showing the upper end of the screw auger of the screw auger advancing device of the above example.

FIG. 9 is a plan view showing an upper end portion of a drive shaft of the screw auger excavating device of the above example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw auger 2 Drive motor (drive means) 3 Drive shaft 4 Cylindrical shaft part 5 Screw 7 Joining engagement part (auger side joining means, engagement part) 8 Joining connection part (pile side joining means, connection part)

Claims (4)

[Claims] 1. A rotary drive means, a drive shaft rotationally driven by the rotary drive means, and a screw auger to which a rotational drive force is transmitted by the drive shaft and movable along the drive shaft. The screw auger has a cylindrical cylindrical shaft portion into which the drive shaft is inserted, and a screw extending vertically while spirally rotating around the outer peripheral portion of the cylindrical shaft portion. Inside the cylindrical shaft portion where the drive shaft is inserted, rotation is transmitted from the drive shaft by engaging with the drive shaft,
A screw auger excavating device provided with an engagement portion that is slidable along a drive shaft. 2. The screw auger is a pile for taking a reaction force from the ground, and is joined to an upper end of a screw auger inserted into the ground and an upper end of a drive shaft inserted into the screw auger. Auger-side joining means provided at the upper end of the drive shaft is provided with shaft-side joining means joined to the auger-side joining means, and is connected to a device that operates by taking a reaction force from the ground The screw auger excavating device according to claim 1, wherein a portion is provided. 3. A screw auger excavating method using the screw auger excavating device according to claim 1 or 2, wherein the screw auger is mounted with the drive shaft inserted into the cylindrical shaft portion of the screw auger. The tip is pushed against the ground, and the screw auger is rotated by rotating the drive shaft by the rotation driving means, and the screw is inserted into the ground so that the ground is excavated by the screw of the screw auger, At the stage when the force for excavating the screw auger is generated by the screw by rotating the screw auger, the vertical position of the drive shaft is substantially fixed, and the screw auger is advanced with respect to the drive shaft by the excavating force. Screw auger excavation method characterized by the following. 4. A method for obtaining a screw auger reaction force using the screw auger excavating device according to claim 2, wherein the screw auger is driven in a state where the drive shaft is inserted into the cylindrical shaft portion of the screw auger. The tip is pushed against the ground, and the screw auger is rotated by rotating the drive shaft by the rotation driving means, and the screw is inserted into the ground so that the ground is excavated by the screw of the screw auger, At the stage where the force for excavating the screw auger by the screw is generated by rotating the screw auger, the vertical position of the drive shaft is substantially fixed, and the screw auger is advanced with respect to the drive shaft by the excavating force, With the screw auger inserted in the ground, lower the drive shaft into the screw auger. And a screw auger and a drive shaft are joined by an auger-side joining means and a shaft-side joining means, and a device that operates by taking a reaction force from the ground is connected to a connecting portion of the drive shaft. Ogre reaction force acquisition method.