JP2016023482A - Drilling unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling unit capable of discharging excavated soil stored in a tank satisfactorily.SOLUTION: A drilling unit 1 comprises a rotary member 6 having an inclined part 62 which is rotated by a second drive part 7 and can remove excavated soil S attached to the inner face of a taper part 3a in a tank 3. As a result, when an auger screw 4 is reversely rotated by a first drive part 5 so as to backfill the excavated soil S temporarily stored in the tank 3, clogging of the taper part 3a by the excavated soil S is prevented by rotating the rotary member 6 so that the excavated soil S in the tank 3 can be discharged satisfactorily.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drilling device.

Conventionally, when a pile is press-fitted into hard ground, earth pressure during pile press-in is attempted by excavating the vicinity of the press-fitting position of the pile with a drilling device.
For example, the soil excavated when pressing the pile into the hard ground is transported upward through the casing and stored in the tank at the top of the casing, and when the casing is pulled out, the auger screw is reversely rotated and stored in the tank There has been known an auger device that can perform backfilling work efficiently without backfilling excavated soil into the ground without discharging the excavated soil to the outside (see, for example, Patent Document 1).
This auger device is provided with a ribbon screw that peels off the soil adhering to the inner surface of the tank so that the excavated soil does not remain in the tank.

JP 2011-80218 A

  However, in the case of the auger device of the above-mentioned Patent Document 1, the ribbon screw can peel off the soil adhering to the cylindrical tank inner surface, but the soil adhering to the tapered inner surface of the portion that is reduced in diameter from the tank to the casing. Since it cannot be peeled off, the excavated soil may be clogged due to consolidation of the reduced diameter portion.

  The objective of this invention is providing the excavation apparatus which can discharge | emit the excavation soil accumulated in the tank favorably.

In order to solve the above problems, the invention described in claim 1
A cylindrical casing;
A tank having a tapered portion connected to the upper end of the casing and having a diameter increasing from the lower portion toward the upper portion;
An auger screw having a screw provided spirally around the auger shaft, extending in the vertical direction and disposed in the casing and the tank;
In a drilling rig comprising:
A rotating member that is coaxial with the auger shaft and rotates along at least the inner surface of the tapered portion is provided in the tank.

The invention according to claim 2 is the excavator according to claim 1,
The rotating member has a rake face on the front side in the rotation direction.

The invention according to claim 3 is the excavator according to claim 1 or 2,
The excavator includes a first drive unit that rotates the auger screw, and a second drive unit that rotates the rotating member,
The first driving unit and the second driving unit are configured to be independently switchable between driving and stopping.

  ADVANTAGE OF THE INVENTION According to this invention, the excavation apparatus which can discharge | emit the excavation soil accumulated in the tank favorably is obtained.

It is a side view which shows the excavation apparatus of this embodiment, and the pile press-fit machine holding the excavation apparatus. It is sectional drawing which shows the excavation apparatus of this embodiment. They are the top view (a) which shows the rotation arm part vicinity to which the rotation member of the excavation apparatus is being fixed, and explanatory drawing (b) which shows the rotation member of the excavation apparatus in cross section. It is explanatory drawing which shows the modification of the rotation member of a digging device by sectional view. It is explanatory drawing which shows the modification of the rotation member of a digging device by sectional view. It is explanatory drawing which shows the modification of the rotation member of a digging device by sectional view. It is explanatory drawing which shows the modification of the rotation member of a digging device by sectional view. It is explanatory drawing which shows the modification of the rotation member of a digging device by sectional view.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an excavator according to the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the excavator 1 includes a cylindrical casing 2, a tank 3 having a larger diameter than the casing 2 and connected to the upper end of the casing 2, and the casing 2 and the tank 3. The auger screw 4 disposed inside, a first drive unit 5 that rotationally drives the auger screw 4, a rotary member 6 that rotates along the inner surface of the tank 3, and a second drive unit that rotationally drives the rotary member 6. 7 etc. are comprised.
This excavation apparatus 1 is a so-called auger apparatus, and the casing 2 and the auger screw 4 are fed into the ground by, for example, a pile press-in machine 10 described later to excavate the ground.

  The casing 2 is supported by a chuck device 15 of a pile press-in machine 10 to be described later, and is installed in an upright posture at a construction site.

The tank 3 has a tapered portion 3a whose diameter increases from the lower portion toward the upper portion, and is connected to the upper end of the casing 2 via the tapered portion 3a.
Excavated soil S excavated by the auger screw 4 can be temporarily stored in the space in the tank 3.

  The auger screw 4 has a screw 4b spirally provided around the auger shaft 4a, and is disposed in the casing 2 and the tank 3 in a posture extending in the vertical direction. An auger head (not shown) is replaceably attached to the lower end portion of the auger screw 4.

The first drive unit 5 is fixed to the top surface part 3 b of the tank 3 in order to rotate the auger screw 4. The first drive unit 5 is, for example, a motor, and is connected to the upper end of the auger screw 4.
When the first drive unit 5 rotates the auger screw 4 forward, the auger screw 4 lifts the excavated soil S through the casing 2 and conveys the excavated soil S into the tank 3. Moreover, when the 1st drive part 5 reversely rotates the auger screw 4, the auger screw 4 will discharge | emit so that the excavated soil S stored in the tank 3 may be refilled in the ground.

The rotating member 6 is rotated by a second driving unit 7 fixed to the top surface part 3 b of the tank 3. The second drive unit 7 is, for example, a motor, and includes a pinion gear 7a that rotates about the motor shaft.
For example, as shown in FIG. 2, the rotating member 6 is a long member that extends vertically along the inner surface of the tank 3, and its lower end side is bent along the inner surface of the tapered portion 3 a. . Although not shown, the rotating member 6 may be a long member that is inclined and extends vertically so that the upper end precedes the lower end during rotation or the lower end precedes the upper end during rotation. .
For example, as shown in FIGS. 2 and 3, the upper end portion of the rotating member 6 is fixed to one end of the rotating arm portion 8, and the other end of the rotating arm portion 8 is the pinion gear 7 a of the second driving portion 7. Is fixed to the gear portion 9 that meshes with the gear portion 9. A central opening 9a is provided at the rotation center of the gear portion 9, and the auger screw 4 is inserted through the central opening 9a. The auger screw 4 is pivotally supported on the same rotating shaft as the gear portion 9.
That is, when the second drive unit 7 is operated and the pinion gear 7a is rotated, the gear unit 9 is rotated, and the rotating member 6 is rotated coaxially with the auger shaft 2a.
In particular, the lower end side of the rotating member 6 is bent, and the rotating member 6 has a vertical portion 61 above the bent portion and an inclined portion 62 below the bent portion. Since the vertical portion 61 is formed along the inner surface of the upper portion of the tank 3 and the inclined portion 62 is formed along the inner surface of the tapered portion 3a at the lower portion of the tank 3, the rotating member 6 rotated by the second driving portion 7 is The upper vertical portion 61 is in sliding contact with the inner surface of the cylindrical tank 3, and the lower inclined portion 62 is in sliding contact with the inner surface of the tapered portion 3a.
Here, the rotary member 6 is in sliding contact with the inner surface of the tank 3 to peel off the excavated soil S attached to the inner surface, but to the extent that the excavated soil S attached to the inner surface of the tank 3 can be peeled off. The rotating member 6 may rotate at a position away from the inner surface of the tank 3.
The rotating member 6 and the rotating arm portion 8 are provided in a pair so as to sandwich the auger screw 4. Three or more rotating members 6 may be provided so as to sandwich the auger screw 4. In this case, it is more preferable that the rotating members 6 are provided at equal intervals in the circumferential direction of the tank 3.

The rotating member 6 has a substantially triangular shape in cross section as shown in FIGS. 3A and 3B, for example, and has a rake face 6a on the front side in the rotation direction.
The rake face 6 a is a face that guides the excavated soil S that has come into contact with the rake face 6 a as the rotating member 6 rotates toward the auger screw 4. The rake face 6 a is a face inclined in the rotational direction from the auger shaft 4 a side of the center of the tank 3 toward the inner face of the tank 3.
By rotating such a rotating member 6 in sliding contact with the inner surface of the tank 3 including the tapered portion 3a, the excavated soil S attached to the inner surface of the tank 3 can be peeled off.
Further, since the rake face 6a is provided on the front side in the rotational direction of the rotating member 6, the rotating member 6 is rotated when the excavated soil S accumulated in the tank 3 is discharged. It can be moved toward the auger screw 4.

  Then, when a pile (for example, steel sheet pile) is press-fitted into the hard ground by a pile press-in machine 10 which will be described later, the excavation apparatus 1 and the pile press-in machine 10 are used together to perform the press-in construction of the pile by the auger combined construction method. it can.

  As shown in FIG. 1, the pile press-in machine 10 is a device that grips the pile P with the chuck device 15 and press-fits it into the ground, and holds and supports the upper end side of the existing pile P that is already buried in the ground. A saddle 12 having a plurality of clamping devices 11, a slide base 13 that can move back and forth with respect to the saddle 12, a leader mast 14 that can pivot left and right on the slide base 13, and can be raised and lowered to the front of the leader mast 14 And a main hydraulic cylinder 16 that drives the chuck device 15 up and down with respect to the leader mast 14.

The clamp device 11 is provided on the lower surface of the saddle 12. For example, the clamping device 11 can grip and grip the upper end portion of the pile P by driving a hydraulic cylinder (not shown) while sandwiching the upper end side of the existing pile P that has been press-fitted in advance. That is, the clamp device 11 functions as a fixing means for fixing the pile press-fitting machine 10 to the upper end portion of the existing pile P by grasping the existing pile P.
In particular, the clamping device 11 can take a reaction force from the existing pile P held and supported so that the pile presser 10 can press-fit the pile P anew or pull out the buried pile P. The pile presser 10 is fixed and installed on the upper end of the existing pile P.
In addition, since the structure of the clamp nail | claw which consists of a fixed clamp nail and a movable clamp nail with which the clamp apparatus 11 is equipped, the hydraulic cylinder which drives a movable clamp nail, and the operation | movement in which a clamp nail grasps the pile P are known, it is detailed here. Do not mention.

  The slide base 13 moves forward with respect to the saddle 12 and moves the chuck device 15 together with the leader mast 14 to the front side, thereby supporting the leading clamp device 11 without moving the saddle 12. Two new piles can be arranged in the front-rear direction and sequentially press-fitted in front of the existing pile P.

The leader mast 14 moves back and forth integrally with the slide base 13.
Further, the leader mast 14 turns right and left with respect to the slide base 13 and changes the direction of the chuck device 15 to bend the direction of the row of piles that are sequentially press-fitted in a right angle or bend in a curved manner. It is possible.

The chuck device 15 is in a state in which the back side thereof is fitted to the front side of the leader mast 14 so as to be movable up and down, and is driven up and down by a main hydraulic cylinder 16 connected to the leader mast 14 and the chuck device 15. ing.
Inside the chuck device 15, for example, a casing chuck for gripping the casing 2 of the excavator 1 and a pile chuck for gripping the pile P are provided. The casing chuck can hold and hold the casing 2 inserted through the chuck device 15 with a claw portion that operates by driving a hydraulic cylinder (not shown). The pile chuck can hold and hold the pile P inserted through the chuck device 15 with a claw portion that operates by driving a hydraulic cylinder (not shown).
In addition, since the structure and operation | movement of the casing cylinder and the pile chuck | zipper with which the chuck | zipper apparatus 15 is equipped, and the hydraulic cylinder which drives the nail | claw part are known, it is not explained in full detail here.

And, when the pile P gripped by the chuck device 15 is press-fitted into the ground, the lifting range of the chuck device 15 is limited, so that the chuck device 15 is lowered by gripping the pile P and the pile P is released. Thus, the raising of the chuck device 15 is repeated. Thus, the press-in of the pile P is repeated for each stroke in which the chuck device 15 moves up and down, and the pile P can be pressed into the ground deeper than the lift range of the chuck device 15.
Similarly, it is possible to pull out the pile P from the ground by repeatedly holding the pile P and raising the chuck device 15 and releasing the pile P and lowering the chuck device 15.
In addition, the casing 2 (excavation device 1) gripped by the chuck device 15 can be pushed down into the ground or pulled up from the ground in the same manner.

The above-described pile press-in machine 10 is configured to press-fit a new pile P at the tip of the existing pile P with the chuck device 15, hold and release the upper end of the existing pile P by the clamp device 11, and slide on the saddle 12. By combining the forward and backward movement of the base 13, it is possible to self-run and move on the pile row composed of the existing piles P.
In addition, since the operation | movement which the pile press-fit machine 10 self-propels on a pile row is known, it does not elaborate here.

  Next, the operation when the excavator 1 backfills the excavated soil S temporarily stored in the tank 3 will be described.

When excavating the ground with the excavator 1, the auger screw 4 that is normally rotated by the first drive unit 5 lifts the excavated soil S through the casing 2 and conveys and accumulates the excavated soil S in the tank 3.
Then, when the casing 2 is pulled out from the ground after completing a predetermined excavation work, the excavated soil S accumulated in the tank 3 is discharged by reversely rotating the auger screw 4 by the first drive unit 5 and backfilled in the ground. . At this time, the second drive unit 7 is also operated to rotate the rotating member 6.

The rotating member 6 that is rotated by the second drive unit 7 and rotates and moves along the inner surface of the tank 3 slides on the inner surface of the tank 3 to peel off the excavated soil S attached to the inner surface of the tank 3.
In particular, since the rotating member 6 has the inclined portion 62 along the inner surface of the tapered portion 3a of the tank 3, the inclined soil 62 can peel off the excavated soil S attached to the inner surface of the tapered portion 3a. it can.
Further, since the rotating member 6 has a rake face 6 a on the front side in the rotation direction, a taper that reduces the diameter of the tank 3 toward the casing 2 when a large amount of excavated soil S accumulates in the tank 3. Even if the excavated soil S is compacted by its own weight in the portion 3a, the excavated soil S that has come into contact with the rake face 6a as the rotating member 6 rotates is transferred to the auger screw at the center of the tank 3 by the rake face 6a. By moving toward 4, the compaction can be eliminated.

  That is, when the excavated soil S in the tank 3 is backfilled with the auger screw 4, the rotating member 6 is rotated to peel off the excavated soil S attached to the inner surface of the tank 3 including the tapered portion 3a. Since the excavated soil S that has come into contact with the rake face 6a can be moved toward the auger screw 4, the excavated soil S can be discharged smoothly from the tank 3.

  Thus, since the excavating apparatus 1 includes the rotating member 6 having the inclined portion 62 that can peel off the excavated soil S attached to the inner surface of the tapered portion 3a, the excavated soil is provided on the tapered portion 3a of the tank 3. S is prevented from clogging, and the excavated soil S temporarily stored in the tank 3 can be discharged well.

The excavator 1 also includes a first drive unit 5 that rotates the auger screw 4 and a second drive unit 7 that rotates the rotating member 6, and the auger screw 4 and the rotating member 6 are independent of each other. Can be operated.
For example, depending on the amount of excavated soil S in the tank 3 and the state of the excavated soil S (for example, whether it is consolidated or wet / dry), the first drive unit 5 and the second drive unit The excavation soil S in the tank 3 is preferably discharged to the ground by the auger screw 4 by switching the driving and stopping of the agitator 7 and switching the rotation and stopping of the auger screw 4 and the rotating member 6 respectively. Can do. For example, if the auger screw 4 is reversely rotated by the first driving unit 5 prior to the rotation of the rotating member 6 by operating the second driving unit 7, the excavation soil S in the tank 3 is centered. Therefore, it is possible to prevent the rotating member 6 from rotating with a low load and the rotation of the auger screw 4, the rotating member 6, and the excavated soil S.
Further, when the auger screw 4 and the rotating member 6 are rotated together, the excavating soil S can be discharged by adjusting the rotational speeds of the auger screw 4 and the rotating member 6 to be different.
In addition, switching the drive and stop of the first drive unit 5 and the second drive unit 7 independently and adjusting the rotational speeds of the auger screw 4 and the rotating member 6 are performed manually. More preferably, it may be performed by automatic control by a control unit that controls the operation of the first drive unit 5 and the second drive unit 7.

  As described above, the excavator 1 of the present embodiment includes the auger screw 4 and the rotating member 6 that can rotate independently of each other, and the auger screw 4 is reversely rotated to be temporarily stored in the tank 3. When the excavated soil S is backfilled, the rotary member 6 is rotated to peel off the excavated soil S adhering to the inner surface of the tank 3, or the excavated soil S that contacts the rake face 6 a as the rotary member 6 rotates is augered. Since it can be moved toward the screw 4, the excavated soil S can be discharged well so as not to remain in the tank 3.

The present invention is not limited to the above embodiment.
For example, as shown in FIG. 4, even in the excavating apparatus 1 including the rotary member 6 having a substantially L-shaped cross-sectional view (substantially “<”-shaped) cross-sectional view, the excavated soil S accumulated in the tank 3 Can be discharged satisfactorily.
Since this rotary member 6 also has a rake face 6a on the front side in the rotation direction, the excavated soil S adhering to the inner surface of the tank 3 can be peeled off or the excavated soil S can be moved toward the auger screw 4. The excavated soil S can be discharged smoothly from the tank 3.

Moreover, as shown in FIG. 5, even if it is the excavation apparatus 1 provided with the rotation member 6 which exhibits cross-sectional view substantially C shape (cross-sectional view substantially circular arc shape), the excavation soil S stored in the tank 3 is favorable. Can be discharged.
Since the rotary member 6 also has a rake face 6a on the front side in the rotation direction, the excavated soil S can be discharged smoothly from the tank 3.

Moreover, as shown in FIG. 6, even if it is the excavation apparatus 1 provided with the rotation member 6 of the substantially flat plate shape in cross section, the excavation soil S collected in the tank 3 can be discharged | emitted favorably.
The rotating member 6 is arranged in such a manner that the edge at the front end in the rotating direction is close to or in contact with the inner surface of the tank 3 and the edge at the rear end is spaced from the inner surface of the tank 3. Since the surface 6 a is provided, the excavated soil S can be smoothly discharged from the tank 3.

Moreover, as shown in FIG. 7, even if it is the excavation apparatus 1 provided with the rotation member 6 of a substantially """shape in cross section, the excavation soil S stored in the tank 3 can be discharged | emitted favorably.
The rotating member 6 is disposed in such a manner that the edge at the front end in the rotation direction is close to or in contact with the inner surface of the tank 3 and the edge at the rear end is spaced from the inner surface of the tank 3. Since the rake face 6 a is provided, the excavated soil S can be discharged smoothly from the tank 3.

Further, as shown in FIG. 8, even in the excavating apparatus 1 including the rotary member 6 having a substantially “no” shape in cross section, the excavated soil S stored in the tank 3 can be discharged well.
The rotating member 6 is arranged in such a manner that the edge at the front end in the rotation direction is close to or in contact with the inner surface of the tank 3 and the edge at the rear end is spaced from the inner surface of the tank 3. Since the rake face 6 a is shaped, the excavated soil S can be discharged smoothly from the tank 3.

In the above embodiment, when the rotary member 6 is rotated by operating the second drive unit 7, the surface on which the rake face 6a is formed is rotated as the front surface in the rotational direction. It is not limited to this. For example, the rotating member 6 shown in FIG. 3B, the rotating member 6 shown in FIG. 4, and the rotating member 6 shown in FIG. 5 have the same shape on the front side and the rear side in the rotation direction. Since it can be considered that a rake face is also formed on the rear side, in the case of the excavator 1 having such a rotating member 6, the rotating member 6 is rotated in the reverse direction by the second drive unit 7. The excavated soil S attached to the inner surface of the tank 3 may be peeled off.
Of course, depending on the state of the excavated soil S in the tank 3, the rotating direction of the rotating member 6 is switched to the forward direction or the reverse direction to strip off the excavated soil S attached to the inner surface of the tank 3. May be.

Moreover, in the above embodiment, although the rotating member 6 demonstrated in the example which has the vertical part 61 above a bending location, and the inclination part 62 below a bending location, this invention is limited to this. It is not a thing. The rotating member referred to in the present invention may be any member that rotates at least along the inner surface of the tapered portion.
Moreover, in the above embodiment, although the excavator 1 demonstrated with the example provided with the 1st drive part 5 which rotates the auger screw 4, and the 2nd drive part 7 which rotates the rotating member 6, this book The invention is not limited to this. The excavator of the present invention may include one drive unit that rotates both the auger screw and the rotating member.
Moreover, although the rotating member 6 demonstrated in the above embodiment the example which has the scoop surface 6a in the front side of a rotation direction, this invention is not limited to this. The rotating member referred to in the present invention may be a member that rotates along the inner surface of the tank, and a rake face is not necessarily formed.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Excavator 2 Casing 3 Tank 3a Taper part 4 Auger screw 4a Auger shaft 4b Screw 5 First drive part 6 Rotating member 6a Rake face 61 Vertical part 62 Inclined part 7 Second drive part 7a Pinion gear 8 Rotating arm part 9 Gear Part 9a Central opening 10 Pile presser S Excavated soil

Claims (3)

A cylindrical casing;
A tank having a tapered portion connected to the upper end of the casing and having a diameter increasing from the lower portion toward the upper portion;
An auger screw having a screw provided spirally around the auger shaft, extending in the vertical direction and disposed in the casing and the tank;
In a drilling rig comprising:
The excavator according to claim 1, wherein a rotating member that is coaxial with the auger shaft and rotates along at least the inner surface of the tapered portion is provided in the tank.   The excavator according to claim 1, wherein the rotating member has a rake face on the front side in the rotation direction. The excavator includes a first drive unit that rotates the auger screw, and a second drive unit that rotates the rotating member,
3. The excavator according to claim 1, wherein the first driving unit and the second driving unit are configured to be independently switchable between driving and stopping.

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