JP6970340B2 - Movable drilling wing operation confirmation device and expansion drilling device equipped with it - Google Patents

Description

The present disclosure relates to an operation confirmation device for a movable drilling wing and an expansion drilling device including the same.

When constructing a pile having an enlarged root compaction portion, as disclosed in Patent Document 1, an expansion excavator having a movable expansion blade (excavation blade) is used. The magnifying blade is rotatable between the reduced diameter state and the enlarged diameter state, and the expansion excavator is capable of excavating the shaft portion of the pile hole when the expansion blade is in the reduced diameter state. On the other hand, the expansion excavator can excavate the expanded portion of the pile hole when the expansion blade is in the expanded state.
The expansion drilling device disclosed in Patent Document 1 includes a confirmation member for confirming that the expansion blade has been expanded in diameter. The confirmation member is configured to be crushed by the expansion blade when the expansion blade is in the expanded state, and the condition of the confirmation member is confirmed after the expansion drilling device is pulled up after excavating the bottom expansion portion. This makes it possible to confirm whether or not the expansion blade has expanded in diameter. That is, it is possible to confirm whether or not the expanded portion of the pile hole has been excavated by looking at the state of the confirmation member.

Japanese Patent No. 5605940

The confirmation member disclosed in Patent Document 1 is disposable because it is crushed by the expanding blade and irreparably deformed, and must be replaced every time excavation is performed. Replacing the confirmation member is not only complicated but also costly.

In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a reusable movable excavation blade operation confirmation device and an expansion excavation device including the same.

(1) The operation confirmation device for the movable excavation blade according to at least one embodiment of the present invention is
In the operation confirmation device of the movable excavation blade applied to the excavation drill that excavates the ground with the movable excavation blade.
A pedestal with a shaft hole and
A pin that has a shaft portion that is reciprocally inserted into the shaft hole and that is displaced from the initial position to the operating position when the movable excavation blade performs a predetermined operation.
A holding means for holding the pin in the operating position when the pin is displaced from the initial position to the operating position.
To prepare for.

According to the above configuration (1), the pin is displaced to the operating position by the operation of the movable excavation blade and is held in the operating position by the holding means. Therefore, by confirming the position of the pin, the movable excavation blade of the movable excavation blade You can check the operation. On the other hand, since the pin is only held by the holding means, the pin can be returned to the initial position again by releasing the holding by the holding means. Therefore, according to the above configuration (1), the operation confirmation device for the movable excavation blade can be repeatedly used without exchanging the pins, and the excavation work can proceed smoothly.

(2) In some embodiments, in the above configuration (1),
The holding means is
A cylindrical recess provided in the shaft portion of the pin and a
Including a cylindrical collar mounted in the recess,
The collar has slits that traverse the collar in the axial direction to allow an elastic outer diameter change of the collar.

According to the above configuration (2), the position of the pin is held by the collar by elastically changing the outer diameter of the collar when the pin is displaced to the operating position. Therefore, according to the above configuration (2), the pin can be held in the operating position with a simple configuration.

(3) In some embodiments, in the above configuration (2),
The collar can hold the pin in the actuated position by being pushed into the shaft hole when the movable excavator blade performs the predetermined actuation.

According to the above configuration (3), the collar is pushed into the shaft hole as the pin is displaced to the operating position, so that the collar fits into the shaft hole and the pin is reliably placed in the operating position with a simple configuration. Can be retained. Further, by applying a force from the operating position to the initial position on the pin, the pin can be easily returned to the initial position.

(4) In some embodiments, in the above configuration (2),
The collar can hold the pin in the actuated position by being pushed out of the shaft hole when the movable excavator blade performs the predetermined actuation.

According to the above configuration (4), the collar is pushed out from the shaft hole as the pin is displaced to the operating position, and the outer diameter of the collar becomes larger than the shaft hole to prevent the pin from coming off, which is a simple configuration. The pin can be reliably held in the operating position. Further, by reducing the diameter of the collar and pushing it into the shaft hole, the pin can be easily returned to the initial position.

(5) In some embodiments, in the above configuration (1),
The holding means is
A convex portion provided so as to project from one of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole toward the other.
A concave portion provided on the other of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole and which can be fitted to the convex portion.
Includes an elastic body that urges the convex portion toward the concave portion.
When the pin is displaced from the initial position to the operating position, the convex portion is fitted into the concave portion to hold the pin in the operating position.

According to the above configuration (5), the convex portion urged by the elastic body is fitted into the concave portion, so that the pin can be reliably held at the operating position with a simple configuration. Further, the pin can be easily returned to the initial position by relaxing the pressing force of the elastic body or elastically deforming the elastic body.

(6) The expansion drilling device according to at least one embodiment of the present invention is
An excavation drill that excavates the ground with movable excavation wings,
The operation confirmation device for the movable excavation blade according to any one of the above configurations (1) to (5) attached to the excavation drill.
To prepare for.

According to the above configuration (6), since the operation confirmation device for the movable excavation blade according to any one of the above configurations (1) to (5) is attached to the excavation drill, the pin is not replaced. The operation confirmation device for the movable excavation blade can be used repeatedly, and the excavation work can proceed smoothly.

According to at least one embodiment of the present invention, there is provided a reusable movable drilling wing operation confirmation device and an expansion drilling device including the same.

It is a side view which shows typically the expansion drilling apparatus which concerns on one Embodiment of this invention. It is a schematic cross-sectional view along the line II-II of the magnifying drilling apparatus in the reduced diameter state. It is a schematic cross-sectional view along the line II-II of the expansion excavator in the expanded state. It is a schematic enlarged view of the region IV of FIG. It is sectional drawing which shows the part of the operation confirmation device of the movable excavation blade applied to the magnifying drilling device. It is a perspective view which shows typically the pin used for the operation confirmation device. It is a perspective view which shows schematic | color used for operation confirmation device. (A) is a schematic plan view of the operation confirmation device when the pin is in the initial position, and (b) is a schematic plan view of the operation confirmation device when the pin is in the operation position. It is a schematic sectional drawing corresponding to FIG. 5 of the operation confirmation apparatus which concerns on another Embodiment of this invention. (A) is a schematic plan view of the operation confirmation device when the pin is in the initial position, and (b) is a schematic plan view of the operation confirmation device when the pin is in the operation position. It is a schematic sectional drawing corresponding to FIG. 5 of the operation confirmation apparatus which concerns on another Embodiment of this invention. It is a schematic sectional drawing corresponding to FIG. 5 of the operation confirmation apparatus which concerns on another Embodiment of this invention. It is a side view which shows typically the expansion drilling apparatus which concerns on another embodiment of this invention. It is a side view which shows typically the expansion drilling apparatus which concerns on another embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. No.
For example, expressions that represent relative or absolute arrangements such as "in one direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfer within the range where the same effect can be obtained. It shall also represent the shape including the part and the like.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions excluding the existence of other components.

FIG. 1 is a side view schematically showing an enlarged drilling apparatus 1 according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line II-II of the magnified drilling rig 1 in a reduced diameter state. FIG. 3 is a schematic cross-sectional view taken along the line II-II of the enlarged drilling rig 1 in the enlarged diameter state. FIG. 4 is a schematic enlarged view of region IV of FIG. FIG. 5 is a cross-sectional view schematically showing a part of the operation confirmation device 3 of the movable drilling blade applied to the enlarged drilling device 1. FIG. 6 is a perspective view schematically showing the pin 5 used in the operation confirmation device 3. FIG. 7 is a perspective view schematically showing the collar 7 used in the operation confirmation device 3. FIG. 8A is a schematic plan view of the operation confirmation device 3 when the pin 5 is in the initial position, and FIG. 8B is a schematic view of the operation confirmation device 3 when the pin 5 is in the operation position. It is a plan view.

As shown in FIGS. 1 to 4, the enlarged excavation device 1 includes an excavation drill 11 having a movable excavation blade 9 for excavating the ground, and an operation confirmation device for the movable excavation blade attached to the excavation drill 11. (Hereinafter, also simply referred to as an operation confirmation device) 3 is provided.
For example, the excavation drill 11 has a screw 12, a rod 13, and an excavation bit 14. The screw 12 is integrally fixed around the rod 13, and a plurality of excavation bits 14 are fixed to the lower end of the screw 12.

Further, the excavation drill 11 has a mechanical movable excavation blade 9. The movable excavation blade 9 has, for example, a drop shape in a plan view, and is swingably attached to the screw 12 of the excavation drill 11. More specifically, a notch is formed in the outer peripheral portion of the screw 12 at a predetermined height, and the movable excavation blade 9 is arranged in the notch. The swing axis of the movable excavation blade 9 is parallel to the axial direction of the rod 13 of the excavation drill 11, and the movable excavation blade 9 can swing in a horizontal plane.

The excavation drill 11 is rotatable about the rod 13, and when rotating in one direction, the excavation drill 11 is in a reduced diameter state as shown in FIG. 2, and the movable excavation blade 9 is along the circumferential direction of the rod 13. Is placed horizontally. In this reduced diameter state, the movable excavation blade 9 is housed in the notch portion of the screw 12, and the excavation drill 11 can excavate the shaft portion of the pile hole.
On the other hand, when rotating in the opposite direction, as shown in FIG. 3, the excavation drill 11 is in the expanded state, and the movable excavation blade 9 is arranged along the radial direction of the rod 13. In this enlarged diameter state, the tip of the movable excavation blade 9 protrudes outward from the screw 12 in the radial direction of the rod 13, so that the outer diameter of the excavation drill 11 becomes larger than in the reduced diameter state. The excavation drill 11 can excavate the expanded portion of the pile hole.

As shown in FIGS. 5 to 8, the operation confirmation device 3 has a pedestal portion 15, a pin 5, and a holding means.
The pedestal portion 15 is fixed to the excavation drill 11 and has a shaft hole 19. For example, the pedestal portion 15 is made of metal and has a prismatic shape, and the cylindrical shaft hole 19 penetrates the pedestal portion 15 straight. The pedestal portion 15 is attached to the screw 12 of the excavation drill 11 by welding. The pedestal portion 15 may be detachably fixed to the excavation drill 11 by bolts or the like.

The pin 5 has a cylindrical shaft portion 23 that is reciprocally inserted into the shaft hole 19, and is displaced from the initial position to the operating position in conjunction with the operation of the movable excavation blade 9. The actuation of the movable excavation blade 9 means that the diameter is displaced from the reduced diameter state shown in FIG. 2 to the enlarged diameter state shown in FIG. 3, and the movable excavation blade 9 projects radially outward of the excavation drill 11. That is. The pin 5 is made of metal, for example, but is configured so as not to be plastically deformed when the movable excavation blade 9 is operated.

In the present embodiment, the pin 5 has a cylindrical head portion 25 coaxial with and integral with the shaft portion 23, and the head portion 25 has an outer diameter larger than the diameter of the shaft hole 19. The head 25 is arranged outside the shaft hole 19, and is configured such that the movable excavation blade 9 abuts on the head 25 and presses the head 25 as the movable excavation blade 9 operates. As a result, the shaft portion 23 of the pin 5 is pushed into the shaft hole 19, and the pin 5 is displaced from the resting position when the excavation drill 11 is in the reduced diameter state to the operating position when the diameter is expanded.
In the present embodiment, the movable excavation blade 9 is configured to come into direct contact with the pin 5 by operating the movable excavation blade 9, but the displacement of the movable excavation blade 9 is transmitted via a transmission member. The pin 5 may be indirectly configured to be displaced.

The holding means includes a cylindrical recess 27 provided in the shaft portion 23 of the pin 5 and a cylindrical collar 7 mounted in the recess 27.
The recess 27 is formed by a circumferential groove having a rectangular cross-sectional shape provided on one end side of the shaft portion 23, that is, on the head portion 25 side.
The collar 7 is made of metal, for example, and has a slit 31 formed therein. The slit 31 vertically traverses the collar 7 in the axial direction, and has a width sufficient to enable an elastic outer diameter change of the collar 7. The collar 7 is fitted in the recess 27, and the relative displacement with respect to the shaft portion 23 is regulated by fitting the collar 7 in the recess 27. Specifically, when the collar 7 is in a free state, the inner diameter of the collar 7 is smaller than the outer diameter of the shaft portion 23 and larger than the outer diameter of the recess 27. Further, the outer diameter of the collar 7 is larger than the outer diameter of the shaft portion 23. Therefore, the collar 7 fitted in the recess 27 moves together with the shaft portion 23 of the pin 5.

Further, the collar 7 has an outer diameter larger than the inner diameter of the shaft hole 19 when it is in a free state, and when the movable excavation blade 9 is activated, the collar 7 together with the shaft portion 23 of the pin 5 has a shaft hole 19. The pin 5 can be held in the operating position by being pushed inward. That is, when the collar 7 is pushed into the shaft hole 19 while being reduced in diameter, the outer peripheral surface of the collar 7 slides with the inner peripheral surface of the shaft hole 19, and the collar 7 is held in the shaft hole 19 by frictional force. .. Since the collar 7 is fitted in the recess 27 of the pin 5, the pin 5 is also held in the pushed position, that is, the operating position.

According to the above configuration, the operation of the movable excavation blade 9 causes a force (operating force) to act in the axial direction of the pin 5 to displace the pin 5 to the operating position. Since the pin 5 is held at the operating position by the holding means, the operation of the movable excavation blade 9 can be confirmed by confirming the position of the pin 5. On the other hand, since the pin 5 is only held by the holding means, the pin 5 can be returned to the initial position again by releasing the holding by the holding means. For example, the pin 5 can be returned to the initial position by applying an impact force (returning force) to the other end side of the shaft portion 23 of the pin 5 with a hammer or the like.
Therefore, according to the above configuration, the operation confirmation device 3 for the movable excavation blade can be used repeatedly without exchanging the pin 5, and the excavation work can be smoothly proceeded.
The amount of displacement of the pin 5 between the operating position and the initial position may be set so that the operator can visually confirm it. For example, the head 25 of the pin 5 abuts on the pedestal portion 15. The position can be set as the operating position, and the position where the head portion 25 of the pin 5 is separated from the pedestal portion 15 can be set as the initial position. In addition, in order to make it possible to confirm the displacement of the pin 5 more reliably, a mark or the like for indicating the operating position or the initial position may be attached to the pin 5 or the collar 7.

Hereinafter, other embodiments according to the present invention will be described, but the same or similar configurations as those described above will be designated by the same name or reference numerals, and the description thereof will be omitted or simplified.
FIG. 9 is a schematic cross-sectional view corresponding to FIG. 5 of the operation confirmation device 33 according to another embodiment of the present invention. FIG. 10A is a schematic plan view of the operation confirmation device 33 when the pin 5 is in the initial position, and FIG. 10B is a schematic view of the operation confirmation device 33 when the pin 5 is in the operation position. It is a typical plan view.

As shown in FIGS. 9 and 10, in the present embodiment, the recess 35 is provided on the other end side of the shaft portion 23, and when the pin 5 is in the initial position, the collar 7 is reduced in diameter by the shaft hole 19. It is in a closed state (bound state). On the other hand, when the pin 5 is displaced to the operating position, the collar 7 comes out of the shaft hole 19 and becomes free, and the outer diameter of the collar 7 expands. Once the outer diameter of the collar 7 becomes large, it is difficult to push the collar 7 into the shaft hole 19 again with a gentle axial force. Thus, the collar 7 can hold the pin 5 in the actuated position by being pushed out of the shaft hole 19 when the movable excavation blade 9 is actuated.
On the other hand, in order to return the pin 5 to the initial position, for example, an impact force (return force) is applied to the other end side of the shaft portion 23 of the pin 5 by a hammer or the like to forcibly reduce the diameter of the collar 7 and push it in. Alternatively, the collar 7 may be pushed into the shaft hole 19 while being reduced in diameter.

FIG. 11 is a schematic cross-sectional view corresponding to FIG. 5 of the operation confirmation device 37 according to another embodiment of the present invention.
In the operation confirmation device 37, a lateral hole 39 communicating with the shaft hole 19 so as to be orthogonal to the shaft hole 19 is provided in the pedestal portion 15, and the lateral hole 39 is closed by the screw 41. A ball 43 and a compression coil spring 45 are arranged between the screw 41 and the shaft portion 23 of the pin 5, and the compression coil spring 45 presses the ball 43 against the shaft portion 23.
A peripheral groove 47 having a semicircular cross section is formed in the shaft portion 23, and the ball 43 is configured to fit into the peripheral groove 47 when the pin 5 comes to the operating position.

According to the above configuration, the holding means is a peripheral groove (recessed portion) 47 formed in the shaft portion 23, a ball (convex portion) 43 that can be fitted to the peripheral groove 47, and a compression coil spring that urges the ball 43. It is composed of a (elastic body) 45 and a screw (adjusting body) 41 that adjusts the pressing force of the compression coil spring, and the pin 5 can also be held in the operating position by the holding means.
When releasing the holding of the pin 5, the other end side of the shaft portion 23 of the pin 5 located on the opposite side of the head 25 is hit with a hammer or the like to apply an impact force so that the compression coil spring 45 contracts. It may be elastically deformed, or the screw 41 may be loosened to loosen the pressing force of the compression coil spring 45.
In this embodiment, in order to prevent earth and sand from entering the shaft hole 19, seal ring materials 49 are arranged on both sides of the ball 43 in the axial direction of the shaft hole 19, and between the seal ring materials 49. It is preferable to fill the gap between the shaft hole 19 and the shaft portion 23 of the pin 5 with grease.

Further, in the above configuration, the convex portion 43 is provided so as to protrude from the inner peripheral surface of the shaft hole 19 toward the concave portion 47 formed on the outer peripheral surface of the shaft portion 23 of the pin 5, but the shaft portion of the pin 5 is provided. A convex portion may be provided so as to project from the outer peripheral surface of the 23 toward the inner peripheral surface of the shaft hole 19. In this case, the pin 5 may be provided with a radial hole, and the ball and the compression coil spring may be arranged in the radial hole. Then, a peripheral groove may be formed as a recess on the inner peripheral surface of the shaft hole 19.
That is, if a convex portion is provided so as to protrude from one of the outer peripheral surface of the shaft portion 23 of the pin 5 and the inner peripheral surface of the shaft hole 19 toward the other, and a concave portion that can be fitted with the convex portion is provided on the other side. good. Then, an elastic body may be provided to urge the convex portion toward the concave portion.

FIG. 12 is a schematic cross-sectional view corresponding to FIG. 5 of the operation confirmation device 51 according to another embodiment of the present invention.
The operation confirmation device 51 is different from the operation confirmation device 3 in that it has an annular washer 53 as an adjusting member for adjusting the operation position. The outer diameter of the washer 53 is larger than the inner diameter of the shaft hole 19 and the outer diameter of the head 25 of the pin 5, and the washer 53 is fitted to the head 25 side of the shaft portion 23. In the operation confirmation device 51, the operation position of the pin 5 can be adjusted by sandwiching the washer 53 between the head portion 25 and the pedestal portion 15. In other words, by adjusting the operating position of the pin 5 with the washer 53, the swing angle of the movable excavation blade 9 can be regulated, and the outer diameter of the excavation drill 11 in the expanded state can be adjusted.

According to the above configuration, the washer 53 can easily adjust the outer diameter of the excavation drill 11 in the expanded state. The outer diameter of the excavation drill 11 in the expanded state can also be adjusted by properly using the pins 5 having heads 25 having different heights without using the washer 53.

FIG. 13 is a side view schematically showing an enlarged drilling device 54 according to another embodiment of the present invention.
The expansion drilling device 54 differs from the expansion drilling device 1 in that the swing axis of the movable drilling blade 9 is inclined with respect to the axial direction of the rod 13 of the drilling drill 11. In this case, the movable excavation blade 9 is arranged along the spiral direction of the screw 12 in the reduced diameter state, and protrudes outward from the screw 12 in the expanded state.

FIG. 14 is a side view schematically showing an enlarged drilling device 55 according to another embodiment of the present invention.
The magnifying drilling device 55 differs from the magnifying drilling device 1 in that the drilling drill 57 has a hydraulically movable drilling blade 59. In the expansion excavation device 55, the movable excavation blade 59 is arranged so that the swing axis of the arm-shaped movable excavation blade 59 coincides with the direction orthogonal to the axial direction of the rod 61 of the excavation drill 57, and the movable excavation blade 59 is arranged. The wing 59 is swingable in a vertical plane. The movable excavation blade 59 is arranged along the rod 61 in the reduced diameter state, and tilts with respect to the rod 61 so that the lower end portion protrudes outward in the radial direction of the rod 61 in the expanded diameter state. The operation confirmation device 3 is attached to the excavation drill 57 so that the pin 5 is positioned at the operation position by the operation of the movable excavation blade 59.
Even in the above configuration, the operation confirmation device 3 for the movable excavation blade can be used repeatedly without exchanging the pin 5, and the excavation work can proceed smoothly.

Finally, the present invention is not limited to some of the above-described embodiments, and includes a modified form of the above-mentioned embodiment and a form in which these forms are appropriately combined.
For example, in the above-described embodiment, the pedestal portion 15 provided separately from the excavation drills 11 and 57 is fixed to the excavation drills 11 and 57 by welding or the like, but depending on the shape and arrangement of the movable excavation blades 9, 59. Therefore, a part of the excavation drills 11 and 57, for example, a part of the rods 13 and 61 may be used as the pedestal portion. In this case, a shaft hole may be provided in the rods 13 and 61, and the shaft portion 23 of the pin 5 may be inserted into the shaft hole.

1,54,55 Enlarged excavation device 3,33,37,51 Movable excavation wing operation confirmation device 5 Pin 7 Color 9,59 Movable excavation wing 11,57 Excavation drill 12 Screw 13,61 Rod 14 Excavation bit 15 Pedestal Part 19 Shaft hole 23 Shaft part 25 Head 27, 35 Recess 31 Slit 39 Side hole 41 Screw 43 Ball 45 Compression coil spring 47 Circumferential groove 49 Seal ring material 53 Washer

Claims (6)

In the operation confirmation device of the movable excavation blade applied to the excavation drill that excavates the ground with the movable excavation blade.
A pedestal with a shaft hole and
A pin that has a shaft portion that is reciprocally inserted into the shaft hole and that is displaced from the initial position to the operating position when the movable excavation blade performs a predetermined operation.
A holding means for holding the pin in the operating position when the pin is displaced from the initial position to the operating position.
A movable excavation wing operation confirmation device characterized by being equipped with. The holding means is
A cylindrical recess provided in the shaft portion of the pin and a
Including a cylindrical collar mounted in the recess,
The operation confirmation device for a movable excavation blade according to claim 1, wherein the collar has a slit that vertically traverses the collar and enables an elastic outer diameter change of the collar. The movable according to claim 2, wherein the collar is capable of holding the pin in the operating position by being pushed into the shaft hole when the movable excavation blade performs the predetermined operation. Operation confirmation device for type excavation blades. The movable type according to claim 2, wherein the collar is capable of holding the pin in the operating position by being pushed out from the shaft hole when the movable excavation blade performs the predetermined operation. Operation confirmation device for excavation blades. The holding means is
A convex portion provided so as to project from one of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole toward the other.
A concave portion provided on the other of the outer peripheral surface of the shaft portion of the pin and the inner peripheral surface of the shaft hole and which can be fitted to the convex portion.
Includes an elastic body that urges the convex portion toward the concave portion.
When the pin is displaced from the initial position to the operating position, the convex portion is fitted into the concave portion to hold the pin in the operating position.
The operation confirmation device for a movable excavation blade according to claim 1. An excavation drill that excavates the ground with movable excavation wings,
The operation confirmation device for a movable excavation blade according to any one of claims 1 to 5 attached to the excavation drill.
An expansion drilling machine characterized by being equipped with.

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