JP2021001454A - Excavation device and excavation method - Google Patents

Abstract

To provide an excavation device and an excavation method for burying a pile material more efficiently by reducing the resistance received from the ground when excavating the inside of the pile material.SOLUTION: An excavation device 30 that is placed inside a press-fitting pile and excavates the ground comprises: a drum cutter 32A provided with a plurality of bits 44 for excavating the ground at one end of a cylindrical member 42A; a drum cutter 32B provided with the plurality of bits 44 for excavating the ground at one end of a cylindrical member 42B having a diameter smaller than that of the cylindrical member 42A; and a planetary gear mechanism 34 that rotates the drum cutters 32A and 32B. The excavation device 30 does not excavate the ground on the entire inner surface of the press-fitting pile like an auger screw, but excavates the ground by the drum cutters 32A and 32B provided with the bit 44 that rotates in a cylindrical shape.SELECTED DRAWING: Figure 2

Description

The present invention relates to an excavator and an excavation method.

In order to bury pile materials such as steel pipes and sheet piles in the ground, a method of burying pile materials while excavating the ground inside the pile materials has been conventionally performed.

For example, Patent Document 1 discloses an excavation device for excavating the ground appearing in a pipe. This excavation device includes an excavation head as an auger screw, a motor that rotationally drives the excavation head, and a moving cylinder for moving the excavation head in the vertical direction (axial direction of the pipe) with respect to the motor. The motor is held inside the pipe by gripping the inner peripheral portion of the pipe body, and a holding cylinder for obtaining a reaction force for rotating the excavation head is provided.

JP-A-2018-76742

Since the excavation device disclosed in Patent Document 1 excavates the ground with an auger screw, it excavates the ground on the entire inner surface of the pile material. For this reason, the drilling rig disclosed in Patent Document 1 has a large resistance from the ground and does not necessarily perform efficient drilling.

Therefore, an object of the present invention is to provide an excavation device and an excavation method capable of burying a pile material more efficiently by reducing the resistance received from the ground when excavating the inside of the pile material.

The excavation device of the present invention is an excavation device arranged inside a pile material for excavating the ground, and includes a first excavation means provided with a plurality of blades for excavating the ground at one end of the first cylindrical member, and the above-mentioned excavation device. A second excavation means provided with a plurality of blades for excavating the ground at one end of a second cylindrical member having a diameter smaller than that of the first cylindrical member, and a planet for rotating the first excavation means and the second excavation means. It is equipped with a gear mechanism.

According to this configuration, instead of excavating the entire inner surface of the pile material as in the case of an auger screw, only the ground on the inner wall of the pile material is excavated by two excavation means provided with a cylindrically rotating blade. .. Therefore, according to the excavation device having this configuration, when excavating the inside of the pile material, the resistance received from the ground during excavation can be made smaller, and the pile material can be buried more efficiently.

In the excavation device of the present invention, the first excavation means is connected to the internal gear or the planet carrier of the planetary gear mechanism, and the second excavation means is connected to the sun gear. According to this configuration, the first excavation means and the second excavation means can be rotated coaxially by a simple configuration using a planetary gear mechanism.

In the excavation device of the present invention, the first excavation means and the second excavation means may be connected to the planetary gear mechanism so that the rotation directions are opposite to each other. According to this configuration, by rotating the first excavation means and the second excavation means in the reverse direction, the relative speed between the first excavation means and the second excavation means can be nearly doubled as compared with the case where the reverse rotation is not performed. Therefore, the ground can be excavated more efficiently.

The excavating device of the present invention holds the rotational driving means, the first excavating means, the second excavating means, and the rotational driving means inside the pile material, in which the rotating shaft is connected to the planetary gear mechanism. May be provided with a gripping means for gripping the inside of the pile material. According to this configuration, the drilling rig can be miniaturized and placed inside the pile material.

The excavating device of the present invention may include an elevating means for raising and lowering the first excavating means and the second excavating means with respect to the gripping means. According to this configuration, the position of the blade of the excavating means with respect to the lower end of the pile material can be adjusted according to the condition of the ground for excavation.

The excavating device of the present invention may include a cable for lifting the first excavating means, the second excavating means, the rotational driving means, and the gripping means from the inside of the pile material. According to this configuration, the drilling rig can be easily taken in and out of the pile material. The cable may also be used as a power cable for supplying electric power to the rotary driving means or the gripping means, or a hydraulic cable for supplying hydraulic oil.

In the excavation device of the present invention, the inside may be excavated by the first excavation means and the second excavation means while the pile material is press-fitted into the ground by a press-fitting machine. According to this configuration, the pile material is press-fitted and the inside of the pile material is excavated at the same time, so that the pile material can be buried more efficiently.

The drilling device of the present invention may be a steel pipe provided with a rotary press-fitting blade at which the pile material excavates the ground at one end. According to this configuration, since the ground is excavated by the pile material itself, the pile material can be buried more efficiently in hard ground or the like.

In the excavation method of the present invention, while the pile material is buried in the ground by a press-fitting machine, the first step of excavating the ground inside the pile material by the excavation device described above and the burying of the pile material are interrupted. A second step of removing the excavator from the pile material to remove the excavated material excavated by the excavator, and a third step of returning the excavator to the inside of the pile material after removing the excavated material. , And the first step to the third step are repeated. According to this configuration, the resistance received from the ground when excavating the inside of the pile material can be made smaller, and the pile material can be buried more efficiently.

According to the present invention, the resistance received from the ground when excavating the inside of the pile material can be made smaller, and the pile material can be buried more efficiently.

It is an external view of the press-fitting machine using the drilling rig of this embodiment. It is a schematic block diagram of the drilling rig of this embodiment, (A) shows the case where the internal gear of a planetary gear mechanism is fixed, and (B) shows the case where the planetary carrier of a planetary gear mechanism is fixed. It is a schematic top view of the planetary gear mechanism and the drum cutter of this embodiment, FIG. 2A is a sectional view taken along the line AA of FIG. 2, and FIG. 2B is a sectional view taken along the line BB of FIG. It is a schematic block diagram which showed the vertical movement of the drum cutter of the excavator arranged inside the press-fitting pile of this embodiment, and (A) shows the case where the bit of a drum cutter and the bit of a press-fitting pile are at the same position. , (B) show the case where the bit of the drum cutter protrudes in the excavation direction from the bit of the press-fit pile. It is a schematic diagram which shows the state which the ground inside the press-fitting pile was excavated before the end of the press-fitting pile by the drilling apparatus of this embodiment. It is the top schematic which shows the example of the case where the drilling rig of this embodiment is applied to the burial of a sheet pile.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below show an example of the case where the present invention is carried out, and the present invention is not limited to the specific configuration described below. In carrying out the present invention, a specific configuration according to the embodiment may be appropriately adopted. The press-fitting machine of the present embodiment self-propells on the head of the completed pile and press-fits the piles in sequence while obtaining a reaction force by clamping the completed pile (completed pile). With this construction method, press-fitting work into underground structures such as hard ground and concrete structures is possible, and since a temporary pier is not required, the construction period can be shortened and environment-friendly construction becomes possible.

FIG. 1 is an external side view of the press-fitting machine 10 of the present embodiment. As shown in FIG. 1, the press-fitting machine 10 has a press-fitting pile 12 which is a pile material standing on the ground A, and while performing excavation or the like on the ground A appearing in the press-fitting pile 12, the press-fitting pile 12 is press-fitted into the ground A. The press-fitting pile 12 and the completed pile 14 of the present embodiment are steel pipes as an example.

The press-fitting machine 10 includes a saddle 20 and a slide frame 22 that slides in the front-rear direction (left-right direction in the drawing) with respect to the saddle 20 and a mast 24 erected on the slide frame 22. A chuck 26 that detachably grips the press-fitting pile 12 is guided in front of the mast 24 by an appropriate guide and is attached so as to be able to move up and down. In the press-fitting machine 10 having such a configuration, the press-fitting pile 12 is press-fitted or press-fitted into the ground A by moving the chuck 26 toward the ground A with respect to the mast 24 while the press-fitting pile 12 is gripped by the chuck 26. The pile 12 is press-fitted into the ground A while rotating.

Further, the saddle 20 has a plurality of clamps 28 (three in the example of FIG. 1) hanging from the saddle 20. The clamp 28 is configured to hold and release the completed pile 14 from the inside while being inserted inside the upper end of the completed pile 14. Then, the press-fitting machine 10 moves (self-propells) along the arrangement direction on the completed pile 14 in which a plurality of the press-fitting machines 10 are arranged.

Further, an excavation device 30 for excavating the ground A is arranged inside the press-fitting pile 12 of the present embodiment. The position of the drilling rig 30 is fixed near the end of the press-fit pile 12 by gripping the inside of the press-fit pile 12, as described in detail later. Then, the inside of the press-fit pile 12 is excavated by the drilling device 30 while being press-fitted into the ground A by the press-fitting machine 10. As a result, since the press-fitting pile 12 simultaneously performs press-fitting or rotary press-fitting by the press-fitting machine 10 and excavation inside the press-fitting pile 12, the press-fitting pile 12 can be buried more efficiently.

Next, the drilling rig 30 of the present embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 is a schematic configuration diagram of the drilling rig 30 of the present embodiment, and FIGS. 2A and 2B show differences in fixed gears. 3A and 3B are schematic top views of the drum cutter 32 and the planetary gear mechanism 34 of the present embodiment, FIG. 3A shows a sectional view taken along the line AA of FIG. 2, and FIG. 3B shows B of FIG. -B sectional view is shown.

The drilling device 30 of the present embodiment mainly includes drum cutters 32A and 32B, a planetary gear mechanism 34, a rotary drive unit 36, a grip portion 38, and an elevating portion 40. The drum cutter 32A corresponds to the first excavation means of the present invention, the drum cutter 32B corresponds to the second excavation means of the present invention, the rotation drive unit 36 corresponds to the rotation drive means of the present invention, and the grip portion 38 corresponds to the present invention. It corresponds to the gripping means of the present invention, and the elevating part 40 corresponds to the elevating means of the present invention. In FIG. 2, the cross sections of the drum cutters 32A and 32B are shown by diagonal lines in order to clarify them.

The drum cutter 32A is provided with a plurality of blades (hereinafter referred to as “bits”) 44 for excavating the ground A at one end of the cylindrical member 42A, and the drum cutter 32B is a cylindrical member 42B having a smaller diameter than the cylindrical member 42A. A plurality of bits 44 for excavating the ground A are provided at one end. It is preferable that the outer diameter of the cylindrical member 42A of the drum cutter 32A is slightly smaller than the inner diameter of the press-fitting pile 12 so that the bit 44 does not come into contact with the inner wall of the press-fitting pile 12. The outer diameter of the drum cutter 32B is set so that the bit 44 of the drum cutter 32A and the bit 44 of the drum cutter 32B are as close as possible to each other. As a result, the drum cutters 32A and 32B can excavate the ground A near the inner wall of the press-fitting pile 12.

In the following description, when the drum cutter 32A and the drum cutter 32B are not separately described, the drum cutter 32 is simply referred to, and when the cylindrical member 42A and the cylindrical member 42B are not separately described, the cylinder is simply cylindrical. It is called a member 42.

The planetary gear mechanism 34 is composed of a sun gear 34A, a planetary gear 34B, a planet carrier 34C, and an internal gear 34D, and drum cutters 32A and 32B are connected below the drum cutters 32A and 32B to rotate the drum cutters 32A and 32B. More specifically, in the planetary gear mechanism 34, the drum cutter 32A is connected to the internal gear 34D or the planet carrier 34C, and the drum cutter 32B is connected to the sun gear 34A (see FIG. 2). As a result, the drilling device 30 can rotate the drum cutter 32A and the drum cutter 32B coaxially with a simple configuration using the planetary gear mechanism 34. The planetary gear mechanism 34 is covered with a gear case 46 above and to the side thereof, and a fixture 48 for fixing the internal gear 34D or the planet carrier 34C is connected to the gear case 46.

As an example, the rotation drive unit 36 has a rotation shaft connected to the sun gear 34A of the planetary gear mechanism 34. That is, the rotation drive unit 36 rotationally drives the drum cutter 32 with the central axis of the cylindrical member 42 as the rotation axis via the planetary gear mechanism 34. The rotary drive unit 36 of the present embodiment is, for example, an electric motor, but the present invention is not limited to this, and the rotary drive unit 36 may be a hydraulic motor. If the drum cutter 32A and the drum cutter 32B can be rotated coaxially, the rotation axis of the rotation drive unit 36 may be connected not only to the sun gear 34A but also to other gears constituting the planetary gear mechanism 34. ..

The rotation drive unit 36 is arranged above the gear case 46. In other words, the gear case 46 is a support member that supports the drum cutter 32 via the rotary drive unit 36 and the planetary gear mechanism 34.

The gripping portion 38 grips the inside of the press-fitting pile 12 in order to hold the drum cutter 32 and the rotation driving portion 36 inside the press-fitting pile 12. As an example, the gripping portion 38 of the present embodiment grips the inside of the press-fitting pile 12 by bringing a plurality of pads 50 into contact with the inside of the press-fitting pile 12. The pads 50 are covered with the pad cover 52, and a plurality of pads 50 are provided in the circumferential direction (rotational direction) and the vertical direction (vertical direction) of the press-fitting pile 12.

The pad 50 is brought into contact with or separated from the inside of the press-fitting pile 12 by, for example, a piston mechanism, a cam mechanism, or a wedge mechanism. The piston mechanism, cam mechanism, and wedge mechanism are driven by flood control or electric power. The mechanism of the grip portion 38 is not limited as long as the drilling device 30 can be detachably fixed to the inside of the press-fit pile 12, and the grip portion 38 may have a structure of being hooked on the inside of the press-fit pile 12, for example.

As described above, the drilling device 30 of the present embodiment includes a grip portion 38 for holding the drum cutter 32 and the rotary drive portion 36 inside the press-fit pile 12. With this configuration, the drilling rig 30 can be miniaturized and detachably arranged inside the press-fit pile 12.

The elevating portion 40 raises and lowers the drum cutter 32 with respect to the grip portion 38. As an example, the elevating portion 40 of the present embodiment is composed of an elevating cylinder 54 and an elevating guide 56. The upper part of the elevating cylinder 54 is connected to the grip portion 38 (pad cover 52), the piston rod is connected to the gear case 46, and when the piston rod moves up and down, the drum cutter 32 moves up and down with respect to the grip portion 38. The elevating cylinder 54 is driven by flood control as an example, but is not limited to this, and may be driven by electric power. By providing the elevating portion 40, the excavating device 30 can perform excavation by adjusting the position of the bit 44 of the drum cutter 32 with respect to the lower end portion of the press-fitting pile 12 according to the state of the ground A.

Further, the elevating guide 56 is a member for smoothly moving the gear case 46 in response to the vertical movement of the piston rod of the elevating cylinder 54 without swinging in the vertical direction, and has such a function. If so, the structure is not limited.

Further, the drilling device 30 includes a cable 58 that lifts the drum cutter 32, the rotary drive unit 36, and the grip portion 38 from the inside of the press-fit pile 12 in order to easily move the drilling device 30 into and out of the press-fit pile 12. As an example, the cable 58 of the present embodiment is also used as a power cable that supplies electric power to the rotary drive unit 36 and the grip portion 38, and a hydraulic cable that supplies hydraulic oil.

Further, as an example, the cable 58 of the drilling device 30 of the present embodiment has a mast 24 via a pulley 62 suspended from a hook 60 arranged above the press-fit pile 12, as shown in FIG. It is wound and unwound by a reel 64 arranged at the upper part. With such a configuration, the drilling device 30 can move up and down inside the press-fitting pile 12 by winding and feeding the cable 58 with the reel 64 without gripping the inside of the press-fitting pile 12. Since the press-fitting pile 12 is rotationally press-fitted, the drilling device 30 itself gripped inside the press-fitting pile 12 also rotates. Therefore, in the drilling device 30, the cable 58 is connected via the rotary joint 66 provided at the upper part, and the cable 58 is prevented from being twisted due to rotation.

According to the configuration of the excavation device 30 described above, the drum cutters 32A and 32B provided with a plurality of bits 44 for excavating the ground A at one end of the cylindrical members 42A and 42B rotate to excavate the inside of the press-fit pile 12. I do. That is, the excavation device 30 of the present embodiment does not excavate the ground A on the entire inner surface of the press-fit pile 12 as in the auger screw, but press-fits the ground A by drum cutters 32A and 32B provided with a bit 44 that rotates in a cylindrical shape. Only the ground A on the inner wall of the pile 12 is excavated in a cylindrical shape. Therefore, according to the excavation device 30 of the present embodiment, the resistance received from the ground A when excavating the inside of the press-fit pile 12 can be made smaller, and the pile material can be buried more efficiently.

Further, the drum cutter 32A and the drum cutter 32B of the present embodiment are connected to the planetary gear mechanism 34 so that the rotation directions are opposite to each other. In the present embodiment, as shown in FIG. 2, the rotation direction of the drum cutter 32 is determined by fixing the internal gear 34D or the planet carrier 34C. Note that FIG. 2A shows a case where the internal gear 34D is fixed by the fixture 48 so that the rotation directions of the drum cutters 32A and 32B are reversed. Further, FIG. 2B shows a case where the planet carriers 34C are fixed by the fixture 48 so that the rotation directions of the drum cutters 32A and 32B are reversed.

By rotating the drum cutter 32A and the drum cutter 32B in the reverse direction in this way, the relative speed between the drum cutter 32A and the drum cutter 32B can be nearly doubled as compared with the case where the drum cutter 32B is not rotated in the reverse direction, so that the ground can be more efficiently grounded. A can be excavated.

Further, when the rotation speeds of the drum cutter 32A and the drum cutter 32B are the same, the bit 44 of the drum cutter 32A having a relatively large diameter travels a longer distance per unit time than the bit 44 of the drum cutter 32B. The bit 44 of the drum cutter 32A wears more than the bit 44 of the drum cutter 32B. If the degree of wear of the bit 44 of the drum cutter 32A and the bit 44 of the drum cutter 32B are different, the maintenance timing of the drum cutters 32A and 32B will be different, and the maintenance work will be complicated.

Therefore, the excavator 30 of the present embodiment is connected to the drum cutter 32A and the sun gear 34A connected to the internal gear 34D or the planet carrier 34C by adjusting the gear ratio of the gears constituting the planetary gear mechanism 34. The peripheral speed (m / sec) with that of the drum cutter 32B may be the same. According to this, since the bits 44 provided in the drum cutters 32A and 32B have the same moving distance per unit time, the degree of wear is the same, and the complexity of the maintenance work for the bits 44 is suppressed.

Next, the vertical movement of the drum cutter 32 of the drilling device 30 arranged inside the press-fitting pile 12 will be described with reference to FIG. The press-fitting pile 12 in FIG. 4 is provided with a rotary press-fitting bit 70 for excavating the ground A at one end. That is, in the present embodiment, since the pipe for excavation is a triple pipe of the press-fit pile 12 itself, the drum cutter 32A, and the drum cutter 32B, the press-fit pile 12 can be buried more efficiently.

By controlling the rotation direction of the rotation drive unit 36, the drilling device 30 can make the rotation direction of the press-fitting pile 12 and the drum cutter 32B the same. The drilling device 30 preferably adjusts the rotation direction of the drum cutter 32 so that the rotation direction of the drum cutter 32A is opposite to that of the press-fit pile 12 and the drum cutter 32B. As a result, the rotation directions of the press-fitting pile 12, the drum cutter 32A, and the drum cutter 32B are staggered, and the relative velocities of the press-fitting piles 12 and the drum cutter 32B are staggered as compared with the case where they are not staggered, so that the ground A can be excavated more efficiently.

FIG. 4A shows a case where the bit 44 of the drum cutter 32 and the bit 70 of the press-fitting pile 12 are at the same position. On the other hand, FIG. 4B shows a case where the bit 44 of the drum cutter 32 protrudes in the excavation direction from the bit 70 of the press-fit pile 12. As shown in FIG. 4B, when the bit 44 of the drum cutter 32 protrudes from the bit 70 of the press-fitting pile 12, the position of the grip portion 38 does not change and the elevating portion 40 extends, so that the drum cutter 32 moves in the excavation direction.

Then, excavation is performed with the bit 44 of the drum cutter 32 protruding from the bit 70 of the press-fit pile 12, and when the drum cutter 32 moves upward, the inside of the press-fit pile 12 is shown as shown in the schematic view of FIG. A space 72 is created along the circumferential direction of the drum cutter 32. Then, when the bit 70 of the press-fitting pile 12 excavates, the ground A excavated into the space 72 inside the press-fitting pile 12 collapses, so that excavation by the press-fitting pile 12 becomes easy.

Next, the process of the drilling method using the drilling device 30 of the present embodiment will be specifically described.

First step: While the press-fitting pile 12 is buried in the ground A by the press-fitting machine 10, the ground A inside the press-fitting pile 12 is excavated by the drilling device 30.

Second step: The burial of the press-fitting pile 12 is interrupted, and excavated objects such as earth and sand excavated by the excavation device 30 (underground obstacles, core 73 remaining after excavation of the excavation device 30 shown in FIG. 5) are removed. To do this, the excavator 30 is removed from the press-fit pile 12. In order to remove the drilling device 30 from the press-fitting pile 12, the gripping portion 38 releases the grip on the inside of the press-fitting pile 12, and the cable 58 is wound up by the reel 64.

As a method of removing the excavated object, for example, the excavating device 30 together with the core 73 housed inside the drum cutter 32B is removed from the press-fitting pile 12. Such a core 73 is a core that breaks when it reaches a certain length, such as a rock, and fits in the drum cutter 32B together with cutting powder. As another method for removing the excavated material, after removing the excavating device 30 from the press-fitting pile 12, a bucket or a hammer grab is lowered from above the press-fitting pile 12 to the inside, and the excavated material is scooped or gripped by these to press-fit. Remove it by lifting it upward from the inside of the pile 12. The bucket, hammer grab, and the like may be lowered and raised using the reel 64 and pulley 62 used in the drilling device 30.

Third step: The drilling device 30 is returned to the inside of the press-fitting pile 12. Then, by repeating the first step to the third step, the ground A inside the press-fit pile 12 is excavated by the drilling device 30 while the press-fit pile 12 is buried in the ground A by the press-fitting machine 10.

Although the present invention has been described above using the above-described embodiment, the technical scope of the present invention is not limited to the scope described in the above-described embodiment. Various changes or improvements can be made to the above embodiments without departing from the gist of the invention, and the modified or improved forms are also included in the technical scope of the present invention.

For example, in the above embodiment, the mode in which the press-fitted pile material is a steel pipe has been described, but the present invention is not limited to this, and the pile material may be a pile material other than a steel pipe such as a sheet pile. FIG. 6 is a schematic top view showing the arrangement of the drilling device 30 when the pile material is the sheet pile 74. In FIG. 6, the gripping portion 38 of the drilling rig 30 is, for example, a hooking portion 76 that is hooked on the inside of the sheet pile 74, and is removed from the inside of the sheet pile 74 after the sheet pile 74 is press-fitted.

10 Press-fitting machine 12 Press-fitting pile (pile material)
30 Drilling device 32A Drum cutter (1st drilling means)
32B drum cutter (second excavation means)
34 Planetary gear mechanism 36 Rotational drive unit (rotational drive means)
38 Gripping part (grip means)
42A Cylindrical member (1st cylindrical member)
42B Cylindrical member (second cylindrical member)
44 bits (blade)

Claims (9)

An excavator that is placed inside the pile to excavate the ground.
A first excavation means provided with a plurality of blades for excavating the ground at one end of the first cylindrical member, and
A second excavation means provided with a plurality of blades for excavating the ground at one end of the second cylindrical member having a diameter smaller than that of the first cylindrical member.
A planetary gear mechanism that rotates the first excavation means and the second excavation means,
A drilling rig equipped with. The excavation device according to claim 1, wherein the planetary gear mechanism is such that the first excavation means is connected to an internal gear or a planet carrier, and the second excavation means is connected to a sun gear. The excavation device according to claim 1 or 2, wherein the first excavation means and the second excavation means are connected to the planetary gear mechanism so that their rotation directions are opposite to each other. A rotary drive means in which a rotary shaft is connected to the planetary gear mechanism,
A gripping means for gripping the inside of the pile material in order to hold the first excavation means, the second excavation means, and the rotation driving means inside the pile material.
The drilling rig according to any one of claims 1 to 3. The excavating device according to claim 4, further comprising an elevating means for raising and lowering the first excavating means and the second excavating means with respect to the gripping means. The excavating device according to claim 4 or 5, further comprising a cable for lifting the first excavating means, the second excavating means, the rotary driving means, and the gripping means from the inside of the pile material. The excavating device according to any one of claims 1 to 6, wherein the pile material is excavated inside by the first excavating means and the second excavating means while being press-fitted into the ground by a press-fitting machine. The excavator according to any one of claims 1 to 7, wherein the pile material is a steel pipe provided with a blade for rotary press-fitting for excavating the ground at one end. The first step of excavating the ground inside the pile material by the excavation device according to any one of claims 1 to 8 while burying the pile material in the ground by a press-fitting machine.
A second step of interrupting the burial of the pile material and removing the excavator from the pile material in order to remove the excavated material excavated by the excavator.
A third step of returning the excavator to the inside of the pile after removing the excavated material,
Have,
An excavation method in which the first step to the third step are repeated.

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