JP2000192499A - Excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent stress and center slippage for a hole inner wall face by setting a support block capable of rotating a horizontal shaft for an outer body on the side of the outer body, and setting a working arm for the support block. SOLUTION: An excavator is provided with a machine body 3 constituted by combining an inner body and an outer body 2 mutually coaxially rotating a vertical shaft. A guide hole 4 vertically penetrated by making the vertical shaft in the inner body a core is provided. A pair of working arms 5 are swingably provided oppositely sideward of the outer body 2. A support block 6 capable of rotating a horizontal shaft for the outer body 2 is provided between the side of the outer body 2 and each arm 5, the arm 5 is swung in a constant direction by the support of the support block 6, and set to be shifted in the constant direction. Thus, if it is used for excavation working in a state where the guide rod is inserted for the guide hole 4, working can be performed without moving the machine body as long as the length of the working arm 5 is applied on the size of a desired hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator suitable for excavating a relatively large and deep vertical hole which is excavated when constructing a deep foundation pile including an expanded bottom type.

[0002]

2. Description of the Related Art Conventionally, when a vertical hole for constructing a deep foundation pile is dug, the hole wall is pressed to obtain a reaction force from the hole wall, or the guide rod is pressed to obtain a reaction force from the guide rod. As a drilling device, a cutter that rotates around a predetermined axis by gripping and excavates and propels earth and sand, rock, and the like, and a manned small machine tool having a working arm and movable by a crawler or the like is used.

[0003]

However, the former cutter cannot excavate unless the cutter rotates, so that the stationary state of the driving member that supports and relatively rotates the rotating member is strongly maintained. The anchor-like measures had to be taken. Moreover, most of the means rely solely on the side wall surface or the bottom wall surface of the vertical hole, which causes stress on the inner surface of the hole and misalignment of the rotating shaft of the cutter. I was In addition, detailed work cannot be performed according to the situation inside the hole. For example, when the cutter becomes large in size according to the hole diameter and becomes a scale of several tens tons or more, when carrying it into a mountainous area, extremely complicated work such as disassembling and carrying must be performed. On the other hand, the excavator with the latter work arm is convenient in that it can perform work according to the situation inside the hole only by changing the attachment attached to the work arm, but even though it is small, the crawler can be moved as the work place moves. Traveling is difficult, and even if it is difficult, since it can move independently of the center of the hole to be drilled, there is a problem that it is difficult to keep the core and diameter of the hole to be drilled constant. Was.

The present invention has been made in view of the above circumstances, and can prevent stress and misalignment on the inner wall surface of a hole, can easily perform fine work, and can hang several tons of cableway. The purpose of the present invention is to provide a drilling device that can be carried in by a drill.

[0005]

An excavator according to the present invention, which has been made to solve the above-mentioned problems, has an airframe constituted by combining an inner body and an outer body which rotate relatively coaxially with a vertical axis. A guide hole penetrating vertically with the vertical axis as a center is provided in the inner body, and a pair of working arms are swingably provided on opposite sides of the outer body.

[0006] The work arm has a joint that can bend like an arm of a backhoe, and has a tip, a bucket, a clamshell, a rock drill, a stand, a drill, a hydraulic breaker, and a rotary screw. Various attachments such as devices can be appropriately mounted according to work. Regarding the work arm, by setting a support block rotatable with respect to the outer body with a horizontal axis on the side surface of the outer body and setting the work arm to the support block, more detailed work can be performed. It becomes possible.

In addition, in preparation for inserting a guide rod with a rack gear into the guide hole, the guide hole is subjected to a measure for preventing the guide rod from swaying and rotating, and the inner body is provided with the guide hole. By drivingly attaching a pinion gear hanging on a rack gear of a guide rod passing through the guide rod, the guide rod can be moved up and down by remote control or the like without using other devices.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drilling rig according to the present invention will be described below with reference to the drawings. The excavator shown in FIGS. 1 to 8 has an inner body 1 that rotates relatively coaxially with a vertical axis.
And a body 3 composed of a combination of an outer body 2 and a guide hole 4 penetrating vertically through the inner body 1 with the vertical axis as a core. Are provided so that they can swing. Between the side surface of the outer body 2 and each of the working arms 5, support blocks 6, 6 rotatable about a horizontal axis with respect to the outer body 2.
The work arm 5 is set to swing in a certain direction and shift in a certain direction by being supported by the support block 6. A skid 9 for integrally installing the excavator is attached to a lower portion of the inner body of the excavator.

The rotation of the inner body 1 and the outer body 2 with respect to each other, the rotation of the support block 6 and the swing of the work arm 5 are performed using hydraulic pressure, and the supply of the hydraulic pressure is performed to either the inner body 1 or the outer body 2. It is performed by an attached electric hydraulic pump (not shown). Furthermore, the drilling rig is intended to be operated remotely as well as on-site,
A camera 10 for sending an image of a work situation to a remote control position is set on the upper part of the outer body 2. The means of remote control may be either wired control or wireless control, but wireless control is advantageous in that wired control and wire routing are not required because there is little influence from disturbance and power lines can be run in parallel. is there. The rotation of the inner body 1 and the outer body 2 is
For example, a combination of a ring gear and a pinion gear attached to the inner body 1 and the outer body 2 in a pair may be used.

The working arm 5 of this embodiment includes a bucket boom 11, a bucket arm 12, and a top attachment 1.
3 is connected at two joints and swings in the same direction at each joint. The top attachment 13 is appropriately replaced with a bucket a, a breaker b, a rotary screw device, a stand c, or the like. , Can be used as a multifunctional device. The bucket boom 11 is pivotally supported on the support block 6, and the supporting point of the bucket boom 11 is a hydraulic tilt cylinder 15 on a supported shaft 14.
The structure which can be shifted by is adopted.

The guide rod 8 includes an inner body 1 and an outer body 2.
A rod having a rectangular cross section inserted through the guide hole 4 with the mutual rotation axis as a core, a rack gear 7 is formed on one side thereof, and a head 16 which is wider than the rectangular portion is provided at the tip. It is attached. Guide hole 4
Is the head 1 of the guide rod 8 with the rack gear 7
Reference numeral 6 denotes a round hole having a diameter enough to allow easy insertion, and the upper and lower ends of the guide hole 4 are fitted with a rectangular section of the guide rod 8 as the anti-sway and anti-rotation measures, And a guide bush 18, 1 having a key hole 17 through which the rack gear 7 can just pass.
8 is mounted so as not to rotate freely with respect to the guide hole 4. The guide bush 18,
Due to the presence of 18, even when a reaction force is applied to the guide rod 8, the posture of the inner body 1 is stabilized, and the guide rod 8 can be prevented from being bent, and the guide attached to the upper end of the guide hole. In the bush 18, a flange portion is formed at the upper end of the guide bush 18, and serves as a clue when the excavator is lifted by the chucking device.

Inside the inner body 1, a pinion gear is rotatably supported (not shown) so as to be engaged with a rack gear 7 which will pass through the key hole 17, and applies a rotational driving force to the pinion gear. Driving means and driving force transmitting means for driving. As the driving means and the driving force transmitting means, any existing means may be used as long as the required power can be obtained. In this example, the driving means using hydraulic pressure is used, and a reduction gear and the like are used. The driving force was transmitted via the. The rack gear attached to the guide rod 8 may be provided only on one side of the guide rod 8, or may be provided on the opposite side of the guide rod 8, and in the latter case, each The pinion gears on the rack gears provided in the directions are provided on the inner body 1 respectively. It goes without saying that the driving means may be designed using electric driving means or other driving force transmitting means.

When performing work using the above-mentioned excavator, first, as shown in FIG.
The top attachment 13 which functions as a stand is mounted, the body 3 is lifted off the ground with the pair of stands c, the center of the deep foundation pile is aligned with the guide hole 4, and the guide hole 4 is oriented vertically. adjust. Next, as shown in FIG. 3, a down-the-hole drill 19 is non-rotatably mounted on the guide hole 4 of the inner body 1 using a crane, and the drill 19 is hit with a bit attached to the tip of the drill 19 via an air swivel 20. The drill 19 is rotated by the rotation of the inner body 1 with respect to the outer body 2 fixed to the ground with the stand c while sending air pressure for applying a force, and the vertical hole for the deep foundation pile is brought to the design depth of the deep foundation pile. The base hole 21 is excavated to a depth to which the length of the centering rod 22 driven into the base hole 21 is added prior to the excavation. The above is the preliminary excavation process.

When the preliminary drilling step is completed, the drill 19 used for drilling the base hole 21 is removed from the guide hole, and instead, as shown in FIGS. The guide bush 18 designed to support the guide rod 8 is attached to the base hole 21 while connecting the guide rod 8 to the base hole 21 to the deepest part while connecting the guide rod 8 one after another. It is attached to the guide hole 4 of the inner body 1. Instead of the stand c, a bucket a and a hydraulic breaker b are attached to the work arms 5 and 5, respectively, and the work arms 5 and 5 swing as shown in FIG. Shifting of the working arms 5 and 5 by the tilt cylinders 15 and 15 as shown in FIG. 7, and further, as shown in FIGS. The hole is expanded to a predetermined shape and depth while performing wall surface reinforcement work by appropriately utilizing a function such as changing the swing direction.
The above is the main excavation process.

As the excavation proceeds, the hole becomes deeper, and the guide rod 8 inserted into the base hole 21
However, as a result of being gradually exposed from the upper part thereof, the upper part of the connected guide rod 8 shakes.
In order to prevent such adverse effects, it is desirable to take measures to stabilize the posture of the guide rod 8 such as setting the rod holder 23 shown in FIG. In this example, in order to prevent a worker from falling into the hole, a semi-circular door 25, 25 which is a double door that closes the hole 24 is set as a rod holder 23, and the pair of doors 25, 25 Has a structure in which the guide rod 8 is held at the center of a semicircle, and the holding portion 26 has a sectional shape in which the guide bush 18 is divided into two. Also,
These doors 25, 25 can be seen over the inside of the hole,
The semi-circular frame is stretched with a relatively strong mesh, for example, while adding sufficient strength so that it does not fall even if an operator gets on it.

[0016]

As described above, when the excavator according to the present invention is used for excavation work with the guide rod inserted into the guide hole, the machine body can be used as long as the length of the work arm is adapted to the desired hole size. The work can be performed without being moved, and by supporting the work arm with a support block that is rotatable about a horizontal axis, the movable area is further expanded. As a result, there is no need to track the position of the aircraft that moves finely, and the progress of the excavation amount can be accurately grasped from the extension, shift state, and turning state of the work arm, and high-precision excavation can be performed even when unmanned remote control is performed. Work becomes possible. Moreover, since the turning of the arm is also performed around the core of the hole to be excavated, accurate excavation work based on the core extending in the vertical direction is performed unless the base hole excavated in advance is correct. Becomes

Also, since a pair of working arms are provided, the stability of the excavator supported by the guide rods is high, and attachments for complementing the mutual functions can be mounted on each of them, and the frequency of replacement of the attachments is low. In addition, if a lifting mechanism using a rack attached to the guide rod and a pinion driven in the machine is adopted, the machine can be moved up and down quickly without using a separate crane.For example, the attachment of the work arm can be replaced. Even when it is necessary, the excavator can be quickly lifted to the ground and replaced, so that the worker does not need to enter the mine. Further, by using a non-cylindrical rod provided with a rack gear as a guide rod, the guide rod can be used as a fulcrum of a work arm that rotates, and a stress on a wall surface such as a rotation support is required on an inner wall surface of the hole. Measures to promote Note that the guide rod can be used as a traveling path of a transport vehicle or the like.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of an excavator according to the present invention.

FIG. 2 is a side view of an embodiment of an excavator according to the present invention, as viewed from the side.

FIG. 3 is a side view of an embodiment of an excavator according to the present invention.

FIG. 4 is an embodiment view from above showing an example of a drilling rig according to the present invention.

FIG. 5 is a top view showing an example of an excavator according to the present invention.

FIG. 6 is a top view showing an example of an excavator according to the present invention.

FIG. 7 is a side view of an embodiment of an excavator according to the present invention.

FIG. 8 is a plan view and a side view showing an example of a rod holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner body, 2 Outer body, 3 Body 4 Guide hole 5 Working arm 6 Support block 7 Rack gear 8 Guide rod

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[Procedure amendment]

[Submission date] December 6, 1999 (1999.12.
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Drilling equipment

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator suitable for excavating a relatively large and deep vertical hole which is excavated when constructing a deep foundation pile including an expanded bottom type.

[0002]

2. Description of the Related Art Conventionally, when a vertical hole for constructing a deep foundation pile is dug, the hole wall is pressed to obtain a reaction force from the hole wall, or the guide rod is pressed to obtain a reaction force from the guide rod. As a drilling device, a cutter that rotates around a predetermined axis by gripping and excavates and propels earth and sand, rock, and the like, and a manned small machine tool having a working arm and movable by a crawler or the like is used.

[0003]

However, the former cutter cannot excavate unless the cutter rotates, so that the stationary state of the driving member that supports and relatively rotates the rotating member is strongly maintained. The anchor-like measures had to be taken. Moreover, most of the means rely solely on the side wall surface or the bottom wall surface of the vertical hole, which causes stress on the inner surface of the hole and misalignment of the rotating shaft of the cutter. I was In addition, it is not possible to perform detailed work according to the situation inside the hole, for example, if the cutter becomes large according to the hole diameter and it becomes a scale of several tens tons or more, when transporting to mountainous areas, it is extremely difficult to carry Complicated work had to be performed. On the other hand, the excavator with the latter work arm is convenient in that it can perform work according to the situation inside the hole only by changing the attachment attached to the work arm, but even though it is small, the crawler can be moved as the work place moves. Traveling is difficult, and even if it is difficult, it is possible to move independently of the center of the hole to be drilled.Therefore, it is difficult to keep the center and diameter of the hole to be drilled constant. Was.

The present invention has been made in view of the above circumstances, and can prevent stress and misalignment on the inner wall surface of a hole, can easily perform fine work, and can hang several tons of cableway. The purpose of the present invention is to provide a drilling device that can be carried in by a drill.

[0005]

An excavator according to the present invention, which has been made to solve the above-mentioned problems, has an airframe constituted by combining an inner body and an outer body which rotate relatively coaxially with a vertical axis. In the excavating device, the inner body is provided with a guide hole vertically penetrated with the vertical axis as a core, and a pair of working arms are swingably provided on opposite sides of the outer body.
The horizontal axis of the outer body is defined on the side surface of the outer body.
To set a rotatable support block, and
The work arm is set .

[0006] The work arm has a joint that can bend like an arm of a backhoe, and has a tip, a bucket, a clamshell, a rock drill, a stand, a drill, a hydraulic breaker, and a rotary screw. Various attachments such as devices can be appropriately mounted according to work. Regarding the work arm, by setting a support block rotatable with respect to the outer body with a horizontal axis on the side surface of the outer body and setting the work arm to the support block, more detailed work can be performed. It becomes possible.

In addition, in preparation for inserting a guide rod with a rack gear into the guide hole, the guide hole is subjected to a measure for preventing the guide rod from swaying and rotating, and the inner body is provided with the guide hole. By drivingly attaching a pinion gear hanging on a rack gear of a guide rod passing through the guide rod, the guide rod can be moved up and down by remote control or the like without using other devices.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drilling rig according to the present invention will be described below with reference to the drawings. The excavator shown in FIGS. 1 to 8 has an inner body 1 that rotates relatively coaxially with a vertical axis.
And a body 3 composed of a combination of an outer body 2 and a guide hole 4 penetrating vertically through the inner body 1 with the vertical axis as a core. Are provided so that they can swing. Between the side surface of the outer body 2 and each of the working arms 5, support blocks 6, 6 rotatable about a horizontal axis with respect to the outer body 2.
The work arm 5 is set to swing in a certain direction and shift in a certain direction by being supported by the support block 6. A skid 9 for integrally installing the excavator is attached to a lower portion of the inner body of the excavator.

The rotation of the inner body 1 and the outer body 2 with respect to each other, the rotation of the support block 6 and the swing of the work arm 5 are performed using hydraulic pressure, and the supply of the hydraulic pressure is performed to either the inner body 1 or the outer body 2. It is performed by an attached electric hydraulic pump (not shown). Furthermore, the drilling rig is intended to be operated remotely as well as on-site,
A camera 10 for sending an image of a work situation to a remote control position is set on the upper part of the outer body 2. The means of remote control may be either wired control or wireless control, but wireless control is advantageous in that wired control and wire routing are not required because there is little influence from disturbance and power lines can be run in parallel. is there. The rotation of the inner body 1 and the outer body 2 is
For example, a combination of a ring gear and a pinion gear attached to the inner body 1 and the outer body 2 in a pair may be used.

The working arm 5 of this embodiment includes a bucket boom 11, a bucket arm 12, and a top attachment 1.
3 is connected at two joints and swings in the same direction at each joint. The top attachment 13 is appropriately replaced with a bucket a, a breaker b, a rotary screw device, a stand c, or the like. , Can be used as a multifunctional device. The bucket boom 11 is pivotally supported on the support block 6, and a supporting point of the bucket boom 11 is provided on a supported shaft 14 by a hydraulic tilt cylinder 15.
The structure which can be shifted by is adopted.

The guide rod 8 includes an inner body 1 and an outer body 2.
A rod having a rectangular cross section inserted through the guide hole 4 with the mutual rotation axis as a core, a rack gear 7 is formed on one side thereof, and a head 16 which is wider than the rectangular portion is provided at the tip. It is attached. Guide hole 4
Is the head 1 of the guide rod 8 with the rack gear 7
Reference numeral 6 denotes a round hole having a diameter enough to allow easy insertion, and the upper and lower ends of the guide hole 4 are fitted with a rectangular section of the guide rod 8 as the anti-sway and anti-rotation measures, And a guide bush 18, 1 having a key hole 17 through which the rack gear 7 can just pass.
8 is mounted so as not to rotate freely with respect to the guide hole 4. The guide bush 18,
Due to the presence of 18, even when a reaction force is applied to the guide rod 8, the posture of the inner body 1 is stabilized, and the guide rod 8 can be prevented from being bent, and the guide attached to the upper end of the guide hole. In the bush 18, a flange portion is formed at the upper end of the guide bush 18, and serves as a clue when the excavator is lifted by the chucking device.

Inside the inner body 1, a pinion gear is rotatably supported (not shown) so as to be engaged with a rack gear 7 which will pass through the key hole 17, and applies a rotational driving force to the pinion gear. Driving means and driving force transmitting means for driving. As the driving means and the driving force transmitting means, any existing means may be used as long as the required power can be obtained. In this example, the driving means using hydraulic pressure is used, and a reduction gear and the like are used. The driving force was transmitted via the. The rack gear attached to the guide rod 8 may be provided only on one side of the guide rod 8, or may be provided on the opposite side of the guide rod 8, and in the latter case, each The pinion gears on the rack gears provided in the directions are provided on the inner body 1 respectively. It goes without saying that the driving means may be designed using electric driving means or other driving force transmitting means.

When performing work using the above-mentioned excavator, first, as shown in FIG.
The top attachment 13 which functions as a stand is mounted, the body 3 is lifted off the ground with the pair of stands c, the center of the deep foundation pile is aligned with the guide hole 4, and the guide hole 4 is oriented vertically. adjust. Next, as shown in FIG. 3, a down-the-hole drill 19 is non-rotatably mounted on the guide hole 4 of the inner body 1 using a crane, and the drill 19 is hit with a bit attached to the tip of the drill 19 via an air swivel 20. The drill 19 is rotated by the rotation of the inner body 1 with respect to the outer body 2 fixed to the ground with the stand c while sending air pressure for applying a force, and the vertical hole for the deep foundation pile is brought to the design depth of the deep foundation pile. The base hole 21 is excavated to a depth to which the length of the centering rod 22 driven into the base hole 21 is added prior to the excavation. The above is the preliminary excavation process.

When the preliminary drilling step is completed, the drill 19 used for drilling the base hole 21 is removed from the guide hole, and instead, as shown in FIGS. The guide bush 18 designed to support the guide rod 8 is attached to the base hole 21 while connecting the guide rod 8 to the base hole 21 to the deepest part while connecting the guide rod 8 one after another. It is attached to the guide hole 4 of the inner body 1. Instead of the stand c, a bucket a and a hydraulic breaker b are attached to the work arms 5 and 5, respectively, and the work arms 5 and 5 swing as shown in FIG. Shifting of the working arms 5 and 5 by the tilt cylinders 15 and 15 as shown in FIG. 7, and further, as shown in FIGS. The hole is expanded to a predetermined shape and depth while performing wall surface reinforcement work by appropriately utilizing a function such as changing the swing direction.
The above is the main excavation process.

As the excavation proceeds, the hole becomes deeper, and the guide rod 8 inserted into the base hole 21
However, as a result of being gradually exposed from the upper part thereof, the upper part of the connected guide rod 8 shakes.
In order to prevent such adverse effects, it is desirable to take measures to stabilize the posture of the guide rod 8 such as setting the rod holder 23 shown in FIG. In this example, in order to prevent a worker from falling into the hole, a semi-circular door 25, 25 which is a double door that closes the hole 24 is set as a rod holder 23, and the pair of doors 25, 25 Has a structure in which the guide rod 8 is held at the center of a semicircle, and the holding portion 26 has a sectional shape in which the guide bush 18 is divided into two. Also,
These doors 25, 25 can be seen over the inside of the hole,
The semi-circular frame is stretched with a relatively strong mesh, for example, while adding sufficient strength so that it does not fall even if an operator gets on it.

[0016]

As described above, when the excavator according to the present invention is used for excavation work with the guide rod inserted into the guide hole, the machine body can be used as long as the length of the work arm is adapted to the desired hole size. The work can be performed without being moved, and by supporting the work arm with a support block that is rotatable about a horizontal axis, the movable area is further expanded. As a result, there is no need to track the position of the aircraft that moves finely, and the progress of the excavation amount can be accurately grasped from the extension, shift state, and turning state of the work arm, and high-precision excavation can be performed even when unmanned remote control is performed. Work becomes possible. Moreover, since the turning of the arm is also performed around the core of the hole to be excavated, accurate excavation work based on the core extending in the vertical direction is performed unless the base hole excavated in advance is correct. Becomes

Also, since a pair of working arms are provided, the stability of the excavator supported by the guide rods is high, and attachments for complementing the mutual functions can be mounted on each of them, and the frequency of replacement of the attachments is low. In addition, if a lifting mechanism using a rack attached to the guide rod and a pinion driven in the machine is adopted, the machine can be moved up and down quickly without using a separate crane.For example, the attachment of the work arm can be replaced. Even when it is necessary, the excavator can be quickly lifted to the ground and replaced, so that the worker does not need to enter the mine. Further, by using a non-cylindrical rod provided with a rack gear as a guide rod, the guide rod can be used as a fulcrum of a work arm that rotates, and a stress on a wall surface such as a rotation support is required on an inner wall surface of the hole. Measures to promote Note that the guide rod can be used as a traveling path of a transport vehicle or the like.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of an excavator according to the present invention.

FIG. 2 is a side view of an embodiment of an excavator according to the present invention, as viewed from the side.

FIG. 3 is a side view of an embodiment of an excavator according to the present invention.

FIG. 4 is an embodiment view from above showing an example of a drilling rig according to the present invention.

FIG. 5 is a top view showing an example of an excavator according to the present invention.

FIG. 6 is a top view showing an example of an excavator according to the present invention.

FIG. 7 is a side view of an embodiment of an excavator according to the present invention.

FIG. 8 is a plan view and a side view showing an example of a rod holder.

[Description of Signs] 1 inner body, 2 outer body, 3 fuselage 4 guide hole 5 work arm 6 support block 7 rack gear 8 guide rod

Claims (3)

[Claims] 1. An airframe (3) comprising a combination of an inner body (1) and an outer body (2) that rotate relatively coaxially with a vertical axis, wherein the inner body (1) is provided with the vertical shaft. A guide hole (4) penetrating vertically is provided with a pair of work arms (5, 5) on opposite sides of the outer body (2).
5) An excavating device provided so as to be swingable. 2. A support block (6, 6) rotatable about a horizontal axis with respect to the outer body (2) is set on a side surface of the outer body (2), and the support block (6, 6) is attached to the support block (6, 6). The excavator according to claim 1, wherein the work arm (5, 5) is set. 3. In order to insert a guide rod (8) with a rack gear (7) into the guide hole (4), a measure for preventing the guide rod (8) from oscillating into the guide hole (4) is provided. 2. A pinion gear (9), which engages with a rack gear (7) of a guide rod (8) passing through the guide hole (4), is drivably attached to the inner body (1). Or the excavator according to 2.