JP2003328674A - Cleaning unit for drilling rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning unit of a drilling rod capable of removing materials adhered to the outer peripheral face of a drilling rod without depending on manual works of an operator, as a result, developing safety of operators for a ground improvement work and reducing labor of operators. <P>SOLUTION: When a push rod 14b of a hydraulic cylinder 14 is projected, a main arm 12 shakes forward a shaking pin 19 as a center and a loose wire 16 is tensed according to the shake. When an engaging hook 15f of a brush member 15 is pulled by the loosen wire 16, a vertical arm 13 is shaken around a shaking pin 21. The brush member 15 connected to the vertical arm 13 is elongated to the drilling rod 6. When the brush member 15 reaches a use position by the elongation, the wire brush 15a is brought into contact with the outer peripheral face of the drilling rod 6 while elastically warping and deforming, the adhered materials such as mud or ground improving agent are scraped from the outer peripheral face of the rotating drilling rod 6. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling rod cleaning unit mounted on a pile driver to remove deposits such as mud from the outer peripheral surface of the drilling rod.

[0002]

[Prior art] Foundation work in various construction work,
As part of this, ground improvement work may be carried out to improve soft ground. In the ground improvement work, for example, a ground improving agent such as cement milk is injected into a vertical hole drilled by a drilling rod, and the injected ground improving agent is solidified. In such a case, first, the auger driving device was attached to the leader of the pile driving machine, and while the auger driving device was raised to the vicinity of the upper end of the leader, the auger driving device was lifted by the crane heavy machine etc. on the rotating shaft of the auger driving device. The upper end of the drilling rod is fixed, and the lower end portion of the drilling rod is fixed by a steady rest mounted on the pile driver.

Then, after the vertical state of the drilled rod is confirmed, when the auger drive device is driven, the drilled rod is rotated and pressed into the ground. Here, a spiral blade or a digging blade is formed at the lower end portion of the drilling rod, and when the drilling rod is rotated by the auger drive device, the weight of the drilling rod or the ground by the spiral blade is reached. The propulsive force directed toward the ground gradually excavates the ground to drill vertical holes. When the vertical hole having a predetermined depth is drilled by the drilling rod, the ground improving agent is injected into the vertical hole, and then the ground improving agent is stirred by the rotation of the drilling rod. After the stirring, when the auger driving device is pulled up along the leader, the drilling rod is pulled out from the vertical hole, and then the ground improvement agent is solidified.

[0004]

By the way, in the above-mentioned ground improvement work, since the ground improvement agent is injected into the drilled vertical hole with the drilling rod still inserted, the outer circumference of the drilling rod is The drilling rod is pulled out from the vertical hole with the soil improvement agent and mud remaining on the surface. For this reason, the ground improvement agent and mud adhering to the outer peripheral surface of the drilling rod were manually wiped from the drilling rod when the drilling rod was pulled out from the vertical hole while rotating. However, wiping off the ground improvement agent or mud from the manually rotating drilling rod in this way may cause a worker to come in contact with the spiral blade or the drilling blade of the drilling rod, or cause rotation of the drilling rod. There is a problem in that the safety of the construction work cannot be sufficiently secured because the worker may be involved.

On the other hand, in the ground improvement work, many vertical holes into which the ground improvement agent is injected are drilled. Therefore, every time the drilling rod is pulled out from the vertical hole after the injection of the ground improvement agent, deposits are removed from the drilling rod. There is a need. Further, when clay-like mud adheres to the drilling rod, such mud adheres to the drilling rod, and therefore it is difficult to remove the adhered material by the work of removing the adhered material by a worker. As is clear from these points, there is a problem that an excessive work load is imposed on the worker when the deposits are manually removed from the drilled rod.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to remove the deposits attached to the outer peripheral surface of the drilled rod without the manual work of the worker. As a result, it is an object of the present invention to provide a drilling rod cleaning unit that can reduce the safety of workers involved in ground improvement work and reduce the labor of workers.

[0007]

In order to achieve this object, a hole-drilling rod cleaning unit according to a first aspect of the present invention is an auger drive device that rotates a hole-drilling rod standing in a vertical direction and press-fits it into the ground. And a pile drive including a leader in which the auger driving device is slidably mounted in the vertical direction and which is erected vertically in the rear of the drilling rod, and a leader bracket which supports the leader so as to sandwich the leader from both sides in the horizontal direction. A main arm that is attached to the machine to remove deposits from the drilling rod. The main arm extends from one side of the leader bracket in the lateral direction, and the base end side of the main arm is connected to the leader bracket. A main joint that allows the main arm to swing in a substantially horizontal plane, a drive unit that swings the main arm between a use position in front of the main joint and a retracted position behind the main joint, and The driving means When the arm is arranged at the use position, a sub arm provided with a cleaning portion on the front end side that abuts on the outer peripheral surface of the drilled rod to remove the attached matter, and the base end side of the sub arm is the main arm. A sub joint part that is connected to the tip end side of the sub arm so that the sub arm can swing in a substantially horizontal plane, and an arm opening angle formed by the main arm and the sub arm at the sub joint part,
The main arm is expanded in the process of moving from the retracted position to the use position, and the expansion member expands the slave arm toward the drilling rod, and the extension member extends the slave arm. Thus, the cleaning portion of the slave arm is moved from the retracted position separated from the drilling rod to the use position in which it contacts the outer peripheral surface of the drilling rod.

According to the hole drilling rod cleaning unit of the present invention, when the hole drilling rod press-fitted into the ground is pulled out, the main arm first moves the main joint portion from the retracted position to the use position by the driving means. It is swung in a substantially horizontal plane as a center. When the sub arm moves from the retracted position to the use position along with the main arm, the extension member causes the sub arm to swing around the sub joint with respect to the main arm, and the arm opening angle formed by the main arm and the sub arm. Is expanded, and the slave arm is extended toward the drilling rod by the expansion.

By the extension of the slave arm, the cleaning portion of the slave arm is brought into contact with the outer peripheral surface of the drilled rod. In this state, the boring rod is rotated by the auger driving device, and when the auger driving device is raised above the leader, the cleaning unit removes the adhered matter adhering to the outer peripheral surface of the boring rod. The arm opening angle formed by the main arm and the sub arm at the sub joint is an included angle formed by a straight line connecting the first and sub joints of the main arm and a straight line extending from the sub joint to the tip side of the sub arm. is there.

A drilling rod cleaning unit according to a second aspect is the drilling rod cleaning unit according to the first aspect,
Both of the main arm and the sub arm are in a state in which the sub joint portion is projected substantially rearward so that the arm opening angle is directed substantially forward at the retracted position.

The drilling rod cleaning unit according to claim 3 is the drilling rod cleaning unit according to claim 2,
The extension member has a leading end portion locked to the leader bracket side, an intermediate portion passed through the outside of the slave joint portion in the projecting direction, and an end portion locked to the slave arm, so that the leader bracket side is formed. To the slave arm via the slave joint portion, the wire member is strained as the main arm swings from the retracted position to the use position.

According to the hole-drilling rod cleaning unit of the third aspect, the same operation as the hole-drilling rod cleaning unit of the second aspect is achieved, and the arm opening angle formed by the main arm and the slave arm is widened. When the slave arm is extended, the wire member is tensioned as the main arm is swung from the retracted position to the use position by the drive means, and thus the tension of the wire member pulls the slave arm by the wire member. By this pulling, the slave arm is swung with respect to the main arm around the slave joint portion in a direction of expanding the arm opening angle. As a result, the slave arm is extended in association with the swing of the main arm.

A hole drilling rod cleaning unit according to a fourth aspect is the hole drilling rod cleaning unit according to the third aspect,
A main joint part formed to be engageable with a connecting bracket provided on one side of the leader bracket in the lateral direction, and a main joint part to which the main arm is connected, and a wire start end member to which a start end part of the wire member is locked. And a mounting member having a stop.

According to the hole drilling rod cleaning unit of the fourth aspect, the same operation as the hole drilling rod cleaning unit of the third aspect is performed, and when the mounting member is locked to the connecting bracket, the main joint Portion and the wire starting end locking portion are arranged on one side in the lateral direction of the leader bracket, the main arm is connected to the leader bracket through the main joint portion, and the wire member is connected through the wire starting end locking portion. Locked on the bracket side.

A piercing rod cleaning unit according to a fifth aspect is the piercing rod cleaning unit according to any one of the first to fourth aspects, in which the cleaning portion of the slave arm is elastically bent and deformable. It is formed of a brush-like body that bundles wire rods, and the orientation of the tip of the brush-like body is in both the tangential direction of the outer peripheral surface of the drilling rod and the rotating direction of the drilling rod when the slave arm is in the use position. Have been matched.

According to the hole-drilling rod cleaning unit of the fifth aspect, the same function as that of the hole-drilling rod cleaning unit according to any one of the aspects 1 to 4 is obtained, and the slave arm is disposed at the use position. And the orientation of the tip of the brush-like body is matched with both the tangential direction of the outer peripheral surface of the drilling rod and the rotating direction of the drilling rod, and the wire rods of the brush-like body are elastically deformed flexibly while deforming. The wire rod of the brush-shaped body is brought into contact with the outer peripheral surface, and the adhered matter is peeled off from the outer peripheral surface of the drilled rod by the contact of the wire members of the brush-like body.

[0017]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a three-point support type pile driver (hereinafter, simply referred to as a “pile driver”) to which a cleaning unit 10 (see FIG. 2 and subsequent figures), which is an embodiment of the drilling rod cleaning unit of the present invention, is mounted. It is a front side view of the base machine 1 of FIG. First, the base machine 1 to which the cleaning unit 10 is attached will be described. As shown in FIG. 1, a base machine 1 serving as a main body of a pile driver is mainly composed of a lower traveling body 2 which can be traveled by a crawler 2a and an upper revolving body which is rotatably mounted on an upper portion of the lower traveling body 2. 3 and 3.

As shown in FIG.
The reader 4 extending vertically (vertically)
The leader 4 is provided with a guide pipe 5 with which an auger drive device (not shown) is slidably engaged in the vertical direction. The auger drive device is a device for applying a rotational force to the drilling rod 6, and the drilling rod 6 is erected on the same axis as the rotating shaft of the auger driving device. A spiral blade or an excavating blade is formed on the outer periphery of the lower end portion of the drilling rod 6, and the rotating force applied by the auger drive device, the weight of the drilling rod 6, and the spiral blade in the underground direction. It is excavated by the driving force of and is gradually pressed into the ground. It should be noted that the spiral blade and the excavating blade of the boring rod 6 are not shown in the drawing.

Further, an outrigger 7 for disposing the base machine 1 on the ground in a stable state is arranged at the front part of the base machine 1. A base end portion (right side in FIG. 1) of the outrigger 7 is axially attached to a front portion of the upper revolving structure 3 so that the opening can be adjusted, and a swinging end of the outrigger 7 is provided with a front jack 8 in a vertical direction. It is fixed. The front jack 8 is composed of a hydraulic cylinder, and a push rod 8a projects downward from the lower end thereof.

FIG. 2 is a front plan view of the base machine 1 to which the cleaning unit 10 is attached. As shown in FIG.
The hole drilling rod 6 described above is arranged at the frontmost part (upper side in FIG. 2) of the upper swing body 3, and the leader 4 is arranged behind the hole drilling rod 6 (lower side in FIG. 2). Also, the upper swing body 3
A leader bracket 4 having a U-shaped recess in plan view, the front side of which is open, is provided in the front portion of the leader bracket 4. The leader 4 is provided in the recess of the leader bracket 4.

This reader 4 has both left and right sides (both sides in the lateral direction).
While being sandwiched by the leader bracket 9, it is vertically supported by two back stays (not shown). Further, the guide pipe 5 with which the auger drive device is engaged
Are provided in front of the reader 4 so as to be separated from each other in the left and right directions, and a pair of outriggers 7, 7 are pivotally attached to both left and right side surfaces of a leader bracket 9 that supports the reader 4.

One of the pair of outriggers 7, 7 (see FIG. 2)
The left side) is expanded by approximately 65 ° in a plan view substantially V-shape with respect to the side surface of the leader bracket 9, and the cleaning unit 10 when not in use is retracted between the expanded outrigger 7 and the leader bracket 9. A unit retreat space S1 that is a space is provided for this purpose. Also, the leader bracket 9
On the lower surface of the side part of the mounting block 11 of the cleaning unit 10.
A fitting bracket 9a for connecting the two is provided. Specifically, the fitting bracket 9a is on the center line L1 that passes through the leader 4 in the left-right direction (lateral direction) and is also the leader 4.
Also, it projects downward from the lower surface of the leader bracket 9 on the left side of the center line L2 that passes through the drilling rod 6 in the front-rear direction (see FIG. 1).

Next, the cleaning unit 10 will be described. As shown in FIG. 2, the cleaning unit 10 is mounted on the left side surface of the leader bracket 9 via a fitting bracket 9a, and mainly includes a mounting block 11, a main arm 12, and a slave arm 13. A hydraulic cylinder 14, a brush member 15, and a relaxation wire 16 are provided. Less than,
Details of each member of the cleaning unit 10 will be described with reference to FIGS. 3 to 6. FIG. 3A shows a mounting block 11
3B is a side view of the mounting block 11. FIG.

As shown in FIG. 3A, the mounting block 1
1 includes a frame body 11a having a substantially square shape. This frame 11
A fitting hole 11a1 having a rectangular shape in a plan view, into which the fitting bracket 9a is inserted, is formed in the center of a.
The pin holes 11a are formed on both side walls in the direction orthogonal to the longitudinal direction of a.
2, 11a2 are formed penetrating on the same axis. Further, the support bracket 1 is provided from one side in the longitudinal direction of the frame body 11a.
1b is extended, and a pin hole 11b1 having a circular shape in plan view is formed at the tip of the support bracket 11b. Further, a locking bracket 11c is extended from the one side wall in which the pin hole 11b2 is formed in the frame body 11a so as to form a substantially L shape with the supporting bracket 11b in a plan view. A locking hole 11c1 having a circular shape in a plan view, in which the start end of 16 is locked, is formed.

As shown in FIG. 3B, the fitting hole 11a1
Is formed so as to penetrate the frame body 11a in the vertical direction, and the pin hole 11a
2, 11a2 are formed in a circular shape in a side view on the lower end side of the frame body 11a, and a pair of support brackets 11b are extended from both upper and lower end portions of the frame body 11a. The pair of support brackets 11b and 11b are spaced apart from each other so that the facing surfaces thereof are substantially parallel to each other, and the pin holes 11b1 and 11b1 are provided in the support bracket 11 respectively.
Penetrations are formed at the tips of b and 11b. The locking bracket 11c is provided on the upper end side of the frame 11a, and the locking hole 11c1 is provided in the locking bracket 11c.
Is formed to penetrate through.

FIG. 4A is a plan view of the main arm 12, and FIG. 4B is a side view of the main arm 12. Figure 4
As shown in (a), the main arm 12 includes a beam body 12a formed in a substantially rectangular parallelepiped shape. A base end bracket 12b is extended outward from one end side (right side in FIG. 4) in the longitudinal direction of the beam body 12a, and a pin hole 12b1 having a circular shape in plan view is formed at a tip end portion of the base end bracket 12b. ing. On the other hand, a tip bracket 12c is extended outward from the other end side of the beam body 12a in the longitudinal direction (left side in FIG. 4), and a pin hole 12c1 having a circular shape in plan view is formed at the tip portion of the tip bracket 12c. Has been done.

A rod connecting plate 12d is extended outwardly from the longitudinal middle portion of the beam 12a so as to form an acute angled V-shape in plan view with the base end bracket 12b.
A pin hole 12d1 having a circular shape in a plan view for connecting the connecting ring 14c of the hydraulic cylinder 14 is formed at the tip of the rod connecting plate 12d. According to the main arm 12, the pin holes 12b1, 12c1, 12d1 are formed so that triangles having the centers of the pin holes 12b1, 12c1, 12d1 as vertices are formed. Further, the beam body 12a includes a tip bracket 12
An engagement hook 12e is provided on the c side, with which the longitudinal intermediate portion of the relaxation wire 16 is engaged.

As shown in FIG. 4 (b), a pair of base end brackets 12b extend from the upper and lower ends of the beam 12a. The pair of base end brackets 12b and 12b are spaced from each other so that their facing surfaces are substantially parallel to each other, and the pin holes 12b1 and 12b.
Reference numeral 1 is formed so as to penetrate the base end brackets 12b and 12b at the tip ends thereof on the same axis. A substantially cylindrical sleeve 12f is provided on the opposing surfaces of the base end brackets 12b and 12b.
Both ends of are fixed, and this sleeve 12f
Is provided with an inner hole 12f1 having an inner diameter substantially equal to that of the pin holes 12b1 and 12b1 and penetrating on the same axis.

On the other hand, the tip bracket 12c also includes the beam body 12.
A pair is extended from both upper and lower end portions of a, the facing surfaces of the tip brackets 12c and 12c are substantially parallel to each other, and the pin holes 12c1 and 12c1 are identical to the tip portions of the tip brackets 12c and 12c, respectively. It is formed penetrating on the axis. In addition, a pair of rod connecting plates 12d are provided in the vertical direction of the beam body 12a so as to be separated from each other by a predetermined width, and the pair of rod connecting plates 12d and 12d are provided with a pin hole 1.
2d1 and 12d1 are penetratingly formed on the same axis.

FIG. 5A is a plan view of the slave arm 13, and FIG. 5B is a side view of the slave arm 13. Figure 5
As shown in (a), the slave arm 13 includes a beam body 13a formed in a substantially rectangular parallelepiped shape. A proximal bracket 13b is extended outward from one end side (the right side in FIG. 5) of the beam body 13a in the longitudinal direction, and a pin hole 13b1 having a circular shape in plan view is formed at the tip end of the proximal bracket 13b. ing. On the other hand, a tip bracket 13c is extended outward from the other end side (the left side in FIG. 5) of the beam body 13a in the long side direction, and a pin hole 13c1 having a circular shape in a plan view is formed at the tip of the tip bracket 13c. Has been formed. A substantially claw-shaped stopper plate 13d extends from the end of the beam 13a on the base bracket 13b side in the same direction as the base bracket 13b. It further projects outward from the tip of the bracket 13b.

An engaging hook 13e with which the longitudinal intermediate portion of the relaxation wire 16 is engaged is also provided on the stopper plate 13d at the distal end of the base bracket 13b. On the other hand, the beam body 13a is provided with a screwing bracket 13f projecting from the end portion on the side of the tip bracket 13c in the width direction of the beam body 13a (downward in FIG. 5), and the screwing bracket 13f has an extension of the tip bracket 13c. A stopper bolt 13g whose head is directed in the installation direction (left side in FIG. 5) is screwed. A stopper nut 13g is provided on the outer circumference of the stopper bolt 13g.
The stopper bolt 13g is prevented from loosening by tightening the lock nut 13g.

As shown in FIG. 5 (b), a pair of base end brackets 13b extend from the upper and lower ends of the beam 13a. The pair of base end brackets 13b, 13b are spaced apart from each other such that their facing surfaces are substantially parallel to each other, and the pin holes 13b1, 13b are formed at the tips of the pair of base end brackets 13b, 13b.
1 are formed so as to penetrate on the same axis. Both ends of a substantially cylindrical sleeve 13i are fixed to the facing surfaces of the base brackets 13b and 13b, respectively, and the sleeve 13i has the same inner diameter as the pin holes 13b1 and 13b1 and penetrates on the same axis. An inner hole 13i1 is provided. The tip bracket 13c is a beam body 13a.
Is extended from the other end side in the longitudinal direction (left side in FIG. 5) in a substantially convex shape in a side view, and the pin hole 13c1 is formed so as to penetrate the tip portion of the tip bracket 13c.

FIG. 6A is a plan view of the brush member 15, and FIG. 6B is a view of the brush member 15 taken along the line BB. As shown in FIG. 6 (a), the brush member 15 includes a wire brush 15 a for scraping off the adhered matter adhering to the outer peripheral surface of the drilled rod 6. The wire brush 15a is formed by bundling a plurality (for example, 12) of elastically bendable and deformable stranded wire wires 15a1 and fixing the base end portions of the stranded wire wires 15a1 by welding. The base end of the wire brush 15a has a mounting plate 15b.
It is sandwiched between the opposing surfaces of the substrate 15b1 and the holding plate 15c.

The mounting plate 15b is formed by bending a single plate into a substantially V shape in a plan view, and a base plate 15b1 facing the holding plate 15c and a portion connected to the base plate 15b1 are connected to the side opposite to the wire brush 15a. And a swash plate 15b2 obliquely installed. The base plate 15b1 sandwiches the base end portion of the wire brush 15a between the surfaces facing the holding plate 15c, and in that state, the base plate 15b1 is fastened together with the holding plate 15c by the tightening metal fittings 15d. By this joint fastening, the base end portion of the wire brush 15a is sandwiched between the opposing surfaces of the substrate 15b1 and the holding plate 15c.

A mounting bracket 15e is provided on the inner surface (valley-folded side surface) of the board 15b1 and the swash plate 15b2.
The mounting bracket 15e is formed with a pin hole 15e1 having a circular shape in a plan view. Further, the swash plate 15b2 is provided with a locking hook 15f extending in the oblique direction, and the loosening wire 16 is provided at the tip of the locking hook 15f.
Is formed with a locking recess 15f1 for locking the end of the. Further, a stopper projection 15g with which the head portion of the above-mentioned stopper bolt 13g can come into contact with the tip of the swash plate 15b2.
Is projected.

As shown in FIG. 6B, the brush member 15
Is provided with a pair of two wire brushes 15a and 15a, and the holding plate 15c is formed in a concave shape on the side facing the substrate 15b1 by bending one plate into a substantially W shape. Holding recesses 15c1 and 15c1 for holding the wire brushes 15a and 15a are arranged in parallel in the vertical direction. Three tightening metal fittings 15d are provided, one each on the upper and lower ends of the holding plate 15c and between the holding recesses 15c1 and 15c1. The three tightening metal fittings 15d make the wire brushes 15a and 15a both substantially equal. It is clamped by the tightening force. One pair of mounting brackets 15e is projected from the middle and lower ends of the mounting plate 15b in the vertical direction. The pair of mounting brackets 15e, 15e are provided so as to be spaced apart from each other substantially in parallel, and the pin hole 15e is provided at the center thereof.
1, 15e1 are penetratingly formed on the same axis.

Referring to FIGS. 7 and 8, the cleaning unit 10
The state of attachment to the base machine 1 will be described. Figure 7
FIG. 4 is a plan view of the cleaning unit 10 in a retracted position,
In the figure, a part of the base machine 1 is shown by a chain double-dashed line. 8A is a side view in which the cleaning unit 10 shown in FIG. 7 is rotationally projected, and FIG. 8B is a side view of FIG. 8A.
FIG. 9B is a partial cross-sectional view taken along line B, in which a part of the cleaning unit 10 is shown in cross-section and the hydraulic cylinder 14 is partially omitted in FIG. 8A.

First, the hydraulic cylinder 14 will be described. As shown in FIG. 7, the hydraulic cylinder 14 gives power for swinging the main arm 12 around the swing pin 19, and is capable of projecting and retracting on the cylinder body 14a and one end side of the cylinder body 14a. The push rod 14b is provided, a connecting ring 14c fixed to the tip of the push rod 14b, and a connecting ring 14d for swingably connecting the cylinder body 14a to the lower surface of the leader bracket 9.

A fitting bracket 9a is projected downward (backward in the plane of FIG. 7) on the lower surface side (left side in FIG. 7) of the leader bracket 9, and the fitting bracket 9a is fitted into a fitting hole in the mounting block 11. It is fitted to 11a1. As a result, the support bracket 11b of the mounting block 11 is extended outward on the left side of the leader bracket 9 in FIG. 7 and protrudes outward from the side surface of the leader bracket 9. In this state, the locking bracket 11c to which the starting end of the relaxation wire 16 is locked is directed to the rear of the leader bracket 9 (downward in FIG. 7).

On the other hand, as shown in FIG. 8 (b), the pin holes 11a2 and 11a2 of the mounting block 11 are aligned with the pin hole 9a1 of the fitting bracket 9a on the same axis, and these pin holes 11a2 and 9a1. , 11a2 have fixed pins 17 inserted therethrough. By this insertion, the fixing pin 17
Penetrates through the fitting bracket 9a and the mounting block 11 in the front-rear direction (left-right direction in FIG. 8B), and a clasp 18 is engaged with the tip of the shaft of the fixing pin 17 (left side in FIG. 8B) that penetrates. Have been combined. In this way, the mounting block 11
It is fixed to the lower surface side portion of the leader bracket 9.

Further, as shown in FIG. 8A, the base end brackets 12b and 12b of the main arm 12 are inserted between the support brackets 11b and 11b of the mounting block 11,
The pin holes 12b1 and 12b1 of the main arm 12 are aligned with the pin holes 11b1 and 11b1 of the mounting block 11 on the same axis. In this state, the pin holes 11b1, 11b1,
12b1 and 12b1 and the inner hole 12f1 of the sleeve 12f
An oscillating pin 19 is inserted therein, and the oscillating pin 19 penetrates the mounting block 11 and the main arm 12 in the vertical direction (vertical direction in FIG. 8A) by this insertion, and the oscillating pin 19 thus penetrated. A clasp 20 is engaged with the lower end (lower side in FIG. 8A) of the. As a result, the main arm 12 is detachably connected to the mounting block 11 at the base end portion (right side in FIG. 7) in a swingable state.

Similarly, the base end brackets 13b and 13b of the slave arm 13 are inserted between the front end brackets 12c and 12c of the main arm 12 to form the pin holes 12c1 and 12c.
1, 13b1, 13b1 and the inner hole 13 of the sleeve 13i
The rocking pin 21 is inserted into the i1.
A clasp 22 is engaged with the lower end (lower side in FIG. 8A) of the. As a result, the sub arm 13 is swingably connected to the tip of the main arm 12 at its base end (right side in FIG. 7).
On the other hand, the mounting brackets 15e, 15e of the brush member 15
The tip bracket 13c of the slave arm 13 is inserted into the pin, and the swing pin 23 is inserted into the pin holes 13c1, 15e1, and 15e1, and the lower end of the swing pin 23 (see FIG.
A clasp 24 is engaged with (a) the lower side). As a result, the brush member 15 is swingably connected to the tip of the slave arm 13 on the base end side of the wire brush 15a.

On the other hand, a connecting ring 14c of the hydraulic cylinder 14 is provided between the rod connecting plates 12d, 12d of the main arm 12.
Is inserted, and the inner periphery of the connecting ring 14c and the pin hole 12d
1, 12d1 are aligned on the same axis. A swing pin 25 is inserted into the pin holes 12d1 and 12d1 and the inner circumference of the coupling ring 14c, and a clasp 26 is engaged with the lower end of the swing pin 25 (lower side in FIG. 8A). It As a result, the rod connecting plates 12d, 12d of the main arm 12
Is rotatably connected to the tip of the push rod 14b of the hydraulic cylinder 14. Further, as shown in FIG. 7, the hydraulic cylinder 14 has a connecting shaft 9b on the inner circumference of the connecting ring 14d.
Is fitted and is rotatably attached to the leader bracket 9 about the connecting shaft 9b. The connecting shaft 9b is a shaft-like body that protrudes downward (backward from the paper surface of FIG. 7) from the lower surface of the leader bracket 9.

Cleaning unit 10 constructed as described above
7 is detachably connected to one side of the leader bracket 9 in the lateral direction through the mounting block 11 in the retracted position shown in FIG. 7, and the main arm 12 is connected to the mounting block 11 through the swing pin 19 and is connected to the leader block. The bracket 9 extends obliquely rearward from the side of the bracket 9. The mounting block 11 and the main arm 12 are connected to each other in a state where the cleaning unit 10 is in the retracted position and are bent in a substantially V shape in a plan view.
Line L connecting the center line L2 of the
The opening angle θ1 formed by 3 is directed rearward (downward in FIG. 7) of the base machine 1. The opening angle θ1 is approximately 135 ° in FIG. 7.

The main arm 12 is a unit retreat space S1.
Is crossed from the left side surface of the leader bracket 9 toward the outrigger 7, and the tip of the main arm 12 reaches near the inner side surface of the outrigger 7. The base end of the slave arm 13 is connected to the tip of the main arm 12 via a swing pin 21.
The slave arm 13 extends from the tip of the main arm 12 along the inner surface of the outrigger 7 toward the swing-side end of the outrigger 7 (upper left in FIG. 7). The main arm 12 and the sub arm 13 are connected in a state of being bent in a substantially V shape in a plan view when the cleaning unit 10 is in the retracted position, and straight lines L3, L4 connecting the centers of the swing pins 19, 21, 23 are connected. The formed opening angle θ2 is directed to the front of the base machine 1, and the connecting portion of both arms 12 and 13 is in a posture (form) in which it is projected to the rear of the base machine 1. Note that FIG.
The opening angle θ2 is about 110 °.

A mounting plate 15 is provided at the base end of the brush member 15 at the tip of the slave arm 13 via a swing pin 23.
b is connected, and the brush member 15 extends obliquely forward from the tip of the secondary arm 13. When the cleaning unit 10 is in the retracted position, the slave arm 13 and the brush member 15 are connected in a state of being bent into a substantially V shape in a plan view, and the straight line L4 connecting the centers of the swing pins 21 and 23 and the wire brush 15a. The formed opening angle θ3 is directed to the side surface of the leader bracket 9. The opening angle θ3 is approximately 95 ° in FIG. 7.

As a result, when the cleaning unit 10 is in the retracted position, the cleaning unit 10 has a bent posture of a substantially U-shape in plan view opened to the front of the base machine 1 by the main arm 12, the sub arm 13, and the brush member 15. The rod retreat space S2 is provided in the inner peripheral portion of the cleaning unit 10 surrounded by the members 12, 13, and 15. Therefore, when the drilling rod 6 shown in FIG. 2 is rotated about the leader 4 counterclockwise by about 90 °, the drilling rod 6 is not disturbed by the cleaning unit 10 and remains in the rod retreat space S2. Can be evacuated.

The relaxation wire 16 is a stranded wire in which a starting end eye 16a and a terminating eye 16b are formed at both ends in the longitudinal direction, and the starting end eye 16a has a substantially D-shaped locking fitting 16c in side view (FIG. 8A). (See) are linked. This locking metal fitting 16c is a locking hole 11c of the mounting block 11.
1 is passed through and is locked to the locking bracket 11c,
By this locking, the starting end of the relaxation wire 16 is locked to the mounting block 11. The middle portion of the slack wire 16 in the longitudinal direction is engaged with the engagement hook 12e of the main arm 12 and the engagement hook 13e of the slave arm 13, and this engagement causes the bay of the connecting portion of the main arm 12 and the slave arm 13. The trailing eye 16b passes outward in the outgoing direction, and the terminal eye 16b is hooked on the locking recess 15f1 of the locking hook 15f of the brush member 15. Moreover, the loosening wire 16 is in a loosened state when the cleaning unit 10 is at the retracted position.

Referring to FIGS. 9 to 12, the operation of the cleaning unit 10 moving from the retracted position to the use position, the operation of cleaning the hole drilling rod 6 by the cleaning unit 10, and the use position to the retracted position. The operation of the cleaning unit 10 moving toward each side will be described. First, the operation of the cleaning unit 10 from the retracted position to the use position will be described with reference to FIGS. 9 and 10.

FIG. 9 shows the mounting block 11 and the main arm 1.
2 is a plan view of the cleaning unit 10 at a position on a substantially straight line (an intermediate position between the use position and the retracted position), and FIG.
Is a plan view of the cleaning unit 10 in a use position,
In FIG. 10, the wire brush 15a before being flexibly deformed is shown by a two-dot chain line. First, as shown in FIG. 7, when the hydraulic cylinder 14 is operated and the push rod 14b is advanced with the cleaning unit 10 in the retracted position,
The main arm 12 is pushed via the rod connecting plate 12d, and by this pushing, the rod connecting plate 12d is rotated in the clockwise direction relative to the connecting ring 14c, and the main arm 12 swings with this rotation. It is swung clockwise around the moving pin 19. The hydraulic cylinder 14 is rotated clockwise around the connecting shaft 9b as the push rod 14b advances.

As the main arm 12 swings, the main arm 1
The tip of 2 gradually moves forward from a position obliquely rearward with respect to the leader 4 which is the retracted position, and accordingly, the slave arm 13 and the brush member 15 also gradually move to a position further forward of the leader 4. The loosening wire 16 that starts moving and is relaxed is gradually transitioned to the tensioned state. After that, when the push rod 14b continues to advance, the main arm 12 is swung to a position substantially aligned with the mounting block 11, as shown in FIG.
And the opening angle θ1 of the mounting block 11 and the main arm 12 is about 180 °.

In the process of reaching such a state, the relaxation wire 16
Is gradually tensioned, and the locking hook 15f of the brush member 15 is pulled by the loosening wire 16 in accordance with this tension. Then, the brush member 15 is swung counterclockwise about the swing pin 23, and the swing angle θ3 is about 1 due to this swing.
It is expanded to near 00 °. This opening angle θ3 is approximately 100
When the angle becomes 0, the stopper projection 15g of the brush member 15 comes into contact with the head portion of the stopper bolt 13g of the slave arm 13, and this contact limits the swing of the brush member 15. As a result, the opening angle θ3 between the brush member 15 and the sub arm 13 is limited to approximately 100 ° or less.

On the other hand, the slave arm 13 is also swung counterclockwise about the swing pin 21 in conjunction with the swing of the brush member 15 by the pulling force of the loosening wire 16, and this swing causes the opening angle. θ2 is also expanded. For example, in FIG. 7, the opening angle θ2 of the main arm 12 and the receiving arm 13 is about 120 °.
It has been expanded to the front and back. Then push rod 1
When 4b is further advanced, the main arm 12 is swung further forward around the swing pin 19 as shown in FIG.
The opening angle θ1 of the mounting block 11 and the main arm 12 is approximately 2
It is rocked until it reaches 60 °.

During the process in which the main arm 12 reaches this position, the tension wire 16 is further tensioned, and this tension causes the locking hook 15f of the brush member 15 to move.
Pulled by. Then, the slave arm 13 is further swung counterclockwise about the swing pin 21, and the swing angle widens the opening angle θ2 to about 165 °. When the opening angle θ2 becomes approximately 165 °, the stopper plate 13d of the slave arm 13 contacts the main arm 12, and the swinging of the slave arm 13 is limited by this contact, and the main arm 12 and the slave arm 1
The opening angle θ2 of 3 is limited to approximately 165 ° or less.

The cleaning operation of the drilling rod 6 by the cleaning unit 10 will be described with reference to FIG. As shown in FIG. 10, the cleaning unit 10 reaches the use position in the state where the opening angles θ2 and θ3 are widened to the maximum. As described above, in the process of reaching the use position, the sub arm 13 connected to the main arm 12 and the brush member 15 connected to the sub arm 13 are extended toward the boring rod 6, and by this extension. The brush member 15 is disposed at the use position, and the wire brush 15a is elastically flexibly deformed and brought into contact with the outer peripheral surface of the drilling rod 6.

On the other hand, the drilling rod 6 which has finished drilling of the vertical hole or stirring of the ground improvement agent is rotated in the direction of arrow R in FIG. 10 and is withdrawn from the vertical hole while maintaining this rotation. . Specifically, when the auger driving device is slid upward along the reader 4 by an elevator device (not shown), the drilling rod 6 is also pulled up along with the auger driving device and pulled out from the vertical hole drilled by itself. Be done. When the wire brush 15a of the cleaning unit 10 in the use position is brought into contact with the outer peripheral surface of the hole drilling rod 6 when the hole drilling rod 6 is pulled out in this manner, the mud adhered to the outer peripheral surface of the hole drilling rod 6 is removed. Deposits such as soil and soil improvement agent (for example, cement milk) are scraped off, whereby most of the deposits are removed from the drilling rod 6.

Here, the orientation of the tip of the wire brush 15a is matched with both the tangential direction of the outer peripheral surface of the drilling rod 6 and the rotating direction of the drilling rod 6 (direction of arrow R in FIG. 10). Therefore, the wire brush 15a does not get caught in the rotation of the boring rod 6 and
By this, the attached matter can be scraped off from the drilled rod 6. Moreover, when the cleaning unit 10 is in the use position shown in FIG. 10, the tension wire 16 in the tension state causes
The main arm 12, the sub arm 13, and the brush member 15 are shown in FIG.
0 clockwise, that is, the brush member 15 to the drilling rod 6
Can be urged in the pressing direction, the wire brush 15a can be more closely attached to the outer peripheral surface of the hole-drilling rod 6, and the adhered matter can be scraped off more smoothly.

The operation of the cleaning unit 10 from the use position to the retracted position will be described with reference to FIGS. 11 and 12. FIG. 11 shows the cleaning unit 1 at an intermediate position from the use position (see FIG. 10) to the retracted position (see FIG. 7).
12 is a plan view of 0, and FIG. 12 is a plan view of the cleaning unit 10 further approaching the retracted position from the position shown in FIG. 11. 11 and 12, for simplification of the drawings, a screw bracket 13f, a stopper bolt 13g, a lock nut 13h, and a brush member of the slave arm 13, which is a member that goes under the outrigger 7 in the process of moving to the retracted position. 1
The locking hook 15f, the stopper projection 15g, and the relaxation wire 16 of No. 5 are omitted in the drawing.

First, in the cleaning unit 10 in the use position shown in FIG. 10, when the hydraulic cylinder 14 is operated and the push rod 14b is retracted into the cylinder body 14a,
The main arm 12 is pulled via the rod connecting plate 12d, and by this pulling, the rod connecting plate 12
d is rotated counterclockwise with respect to the connecting ring 14c around the swing pin 25, and the main arm 1
2 is swung counterclockwise about the swing pin 19. The hydraulic cylinder 14 is rotated counterclockwise about the connecting shaft 9b as the push rod 14b retracts.

With the swinging of the main arm 12 in the counterclockwise direction, the tip of the main arm 12 gradually moves backward from the use position, which is the diagonally forward position of the reader 4, toward the main arm 1.
2, the slave arm 13 and the brush member 15 also gradually start moving to the rear position. After that, hydraulic cylinder 1
When the push rod 14b of No. 4 further continues to retreat, the cleaning unit 10 passes through the position shown in FIG. 9 and reaches the position shown in FIG. Approximately 260 at the use position shown in FIG.
The opening angle θ1 which was 0 ° is the slave arm 10 shown in FIG.
Is approximately 160 °, and due to the inertia of the brush member 15 and the sub arm 13 when the main arm 12 swings to the position shown in FIG. 11, there is approximately 165 ° in the use position shown in FIG. The opening angle θ2 is slightly smaller.

For example, the opening angle θ2 shown in FIG. 11 is about 150 ° which is smaller than the value at the use position by about 15 °.
It is said that In this state, the swash plate 15b of the brush member 15
The tip of 2 is two sheets 1 which are projected from the tip of the outrigger 7.
It abuts on one of the brackets 7a, 7a of the set. After this contact, when the push rod 14b of the hydraulic cylinder 14 is further retracted, the main arm 12 is further swung counterclockwise around the swing pin 19, and the slave arm 13 is swung by the swing pin 21.
Further, the brush member 15 is further swung clockwise, and the brush member 15 is swung clockwise with respect to the follower arm 13 around the swing pin 23, and the posture of the cleaning unit 10 is changed to the state shown in FIG. .

At the position shown in FIG. 12, the mounting block 11
And the opening angle θ1 of the main arm 12 is about 210 °, the opening angle θ2 of the main arm 12 and the sub arm 13 is about 120 °, and the opening angle θ3 of the sub arm 13 and the brush member 15 is about 95 °. When the push rod 14b of the hydraulic cylinder 14 is further retracted, the posture of the cleaning unit 10 changes to the state shown in FIG. 7, and the cleaning unit 10 reaches the retracted position. Here, in the process in which the cleaning unit 10 reaches the retracted position, the outer surface of the stopper plate 13d of the slave arm 13, that is, the surface of the stopper plate 13d facing the outrigger 7 is brought into contact with the outrigger 7, and by this contact,
The posture of the slave arm 13 is made substantially parallel to the outrigger 7, and the retracting operation of the cleaning unit 10 is completed.

The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. Is easily guessed. For example, in the present embodiment, the cleaning unit 10 is mounted on the left side of the lower surface of the leader bracket 9 as shown in FIG. 7, but the mounting position is not necessarily limited to this, and the wire brush 15a may be mounted at the use position. It may be at another position such as the right side of the lower surface of the leader bracket 9 as long as it can contact the drilling rod 6.

Further, in the present embodiment, the hydraulic cylinder 14 has been described as an example of the driving means of the present invention, but the driving means is not necessarily limited to this, and the main arm 12 is provided on the lower surface side of the leader bracket 9. Any device can be used as long as it can apply power for rocking at the section, and for example, another hydraulic actuator such as a hydraulic motor may be used. Further, the drive system of the device is not necessarily limited to the hydraulic system as long as it is a device capable of generating power for swinging the main arm 12, and may be, for example, a pneumatic system or an electric system.

[0065]

According to the hole drilling rod cleaning unit of the first aspect, the slave arm extended through the main arm mounted on the leader bracket of the pile driver is provided on the tip side of the slave arm. Since the cleaning unit scrapes off the adhering matter from the drilled rod, it is not necessary for the worker to manually wipe off the adhering matter from the rotating drilled rod. Therefore, there is no risk that the worker will come into contact with or be caught in the rotating drilling rod, and there is an effect that the safety in the construction work can be sufficiently ensured and the labor for the worker can be reduced.

In addition to the effect of the drilling rod cleaning unit according to claim 1, the drilling rod cleaning unit according to claim 2 has an arm opening angle of both the main arm and the slave arm at their retracted positions. Since the secondary joint portion is formed to project substantially rearward so as to face substantially forward, a predetermined space can be provided in the bay defined by the main arm and the slave arm. Therefore, for example, when the drilling rod is rotated about the leader bracket to one side in the lateral direction of the leader bracket by approximately 90 °, the drilling rod is provided in the bay defined by the main arm and the slave arm. The effect is that it can be accommodated in an open space.

According to the hole-drilling rod cleaning unit of the third aspect, in addition to the effect of the hole-drilling rod cleaning unit of the second aspect, the arm opening angle formed by the main arm and the slave arm is widened to increase the slave arm. When extending the secondary arm, the secondary arm is extended by the wire member in conjunction with the swing of the primary arm. Therefore, it is not necessary to separately provide a complicated link mechanism for extending the secondary arm. The structure can be simplified and the manufacturing cost can be reduced accordingly.

According to the hole-drilling rod cleaning unit of the fourth aspect, in addition to the effect of the hole-drilling rod cleaning unit of the third aspect, the leader is attached by locking the attachment member to the connecting bracket of the leader bracket. The main joint portion and the wire starting end locking portion can be provided on one lateral side of the bracket. Therefore, if only the connecting bracket is provided on one side in the lateral direction of the leader bracket, it is not necessary to newly install the main joint portion and the wire start end locking portion separately in the leader bracket, and the drilling rod cleaning unit of the present invention. Has the effect of being able to be installed on an existing pile driver.

Moreover, in many pile driving machines, a connecting bracket for connecting another attachment is already installed on one side in the lateral direction of the leader bracket, so that there is such a pile driving machine. As a result, there is an effect that the hole-drilling rod cleaning unit can be mounted without any modification or modification for newly installing the connecting bracket.

According to the hole-drilling rod cleaning unit of the fifth aspect, in addition to the effect of the hole-drilling rod cleaning unit according to any one of the aspects 1 to 4, when the slave arm is disposed at the use position, That is, when the brush-shaped body is brought into contact with the drilling rod, the direction of the tip of the brush-shaped body is matched with both the tangential direction of the outer peripheral surface of the drilling rod and the rotation direction of the drilling rod. There is an effect that the adhering substance can be smoothly scraped off from the drilling rod without the brush-like body being caught in the rotation of the drilling rod.

Further, since the plurality of brush-shaped wires can contact the outer peripheral surface of the drilling rod while elastically bending,
Due to the elastic restoring force associated with the flexural deformation, it is possible to make close contact with the outer peripheral surface of the drilled rod, and it is possible to more reliably scrape off the attached matter. Moreover, since the wire rods of the bunch of a plurality of wire rods disperse from each other, it is possible to smoothly remove the deposits attached to the outer peripheral surface of the hole-forming rod having irregularities such as the spiral blade and the excavating blade. effective.

[Brief description of drawings]

FIG. 1 is a front side view of a base machine to which a cleaning unit according to an embodiment of the present invention is attached.

FIG. 2 is a front plan view of the base machine on which the cleaning unit is mounted.

FIG. 3A is a plan view of a mounting block,
(B) is a side view of a mounting block.

FIG. 4A is a plan view of a main arm, and FIG.
[Fig. 4] is a side view of the main arm.

FIG. 5A is a plan view of a slave arm, and FIG.
[Fig. 4] is a side view of a slave arm.

6A is a plan view of a brush member, FIG.
(B) is an arrow line view in the BB line of (a).

FIG. 7 is a plan view of the cleaning unit in the retracted position.

FIG. 8 (a) shows the cleaning unit shown in FIG.
It is a side view which carried out rotation projection along the IX line, and (b) is,
It is a fragmentary sectional view in the BB line of (a).

FIG. 9 is a plan view of the cleaning unit in which the mounting block and the main arm are located on a substantially straight line.

FIG. 10 is a plan view of the cleaning unit in the use position.

FIG. 11 is a plan view of the cleaning unit at a midway position from the use position to the retracted position.

FIG. 12 is a plan view of the cleaning unit which is closer to the retracted position from the position shown in FIG.

[Explanation of symbols]

1 Base Machine for Pile Driver (Pile Driver) 4 Leader 6 Drilling Rod 9 Leader Bracket 9a Fitting Bracket (Connecting Bracket) 10 Cleaning Unit (Drilling Rod Cleaning Unit) 11 Mounting Block (Mounting Member) 11b Support Bracket (Part of main joint part) 11c Locking bracket (wire start end locking part,
Part of extension member 12 Main arm 12b Base end bracket (part of main joint part) 12c Tip bracket (part of sub joint part) 12e, 13e Engagement hook (part of extension member) 13 Sub arm (subpart) Part of arm 13b Base end bracket (part of slave joint part) 14 Hydraulic cylinder (driving means) 15 Brush member (cleaning part of slave arm, part of slave arm) 15a Wire brush (brush-like body) 15a1 Twist Wire wire (wire material) 15f Locking hook (part of extension member) 16 Relaxation wire (wire member, part of extension member) 16a Starting end eye (starting end of wire member) 16b Ending eye (one end of wire member) 16c Locking metal fitting (part of terminal part of wire member) 19 Swing pin (part of main joint part) 21 Swing pin (part of slave joint part) θ2 Opening angle (arm opening angle) S2 De retraction space (space of the main arm and secondary arm imitates the bay)

Claims (5)

[Claims] Claim: What is claimed is: 1. An auger drive device for rotating a vertically drilled rod to press-fit it into the ground, and the auger drive device is mounted so as to be slidable in the vertical direction. A drilling rod cleaning unit that is mounted on a pile driver equipped with a leader installed vertically and a leader bracket that supports the leader so as to sandwich the leader from both sides in the lateral direction. A main arm extending from one side in the lateral direction of the main arm, a main joint part that connects the base end side of the main arm to a leader bracket and allows the main arm to swing in a substantially horizontal plane, and Driving means for rocking the main arm between a front use position and a retracted position behind the main joint portion, and an outer circumference of a drilling rod when the main arm is placed in the use position by the drive means. Abut on the surface The secondary arm provided with a cleaning unit for removing the adhered substances on the front end side, and the secondary arm for connecting the base end side of the secondary arm to the front end side of the main arm so that the secondary arm can swing in a substantially horizontal plane. The arm opening angle formed by the main arm and the sub arm at the joint portion and the sub joint portion is expanded in the process of the main arm moving from the retracted position to the use position, and the sub arm is ground by the expansion. An extension member that extends toward the hole rod, and by the extension member extending the slave arm, the cleaning portion of the slave arm is moved from the retracted position separated from the hole rod to the outer peripheral surface of the hole rod. A drilling rod cleaning unit characterized by being moved to a use position where it abuts. 2. Both of the main arm and the sub arm are configured such that the sub joint portion is projected substantially rearward so that the arm opening angle is directed substantially forward at the retracted position. The hole drilling rod cleaning unit according to claim 1. 3. The extension member has a starting end portion locked to the leader bracket side, an intermediate portion passed through the outside of the slave joint portion in a projecting direction, and an end portion locked to the slave arm. A wire member from the leader bracket side to the slave arm via the slave joint portion, and the wire member is to be tensioned as the main arm swings from the retracted position to the use position. The drilling rod cleaning unit according to claim 2. 4. The leader bracket is formed to be engageable with a connecting bracket provided on one lateral side of the leader bracket, and
The drilling hole according to claim 3, further comprising: a mounting member having the main joint portion to which the main arm is connected, and a wire start end locking portion to which a start end portion of the wire member is locked. Rod cleaning unit. 5. The cleaning portion of the slave arm is formed by a brush-like body that bundles a plurality of elastically bendable and deformable wires.
The orientation of the tip of the brush-like body is aligned with the tangential direction of the outer peripheral surface of the drilling rod and the rotation direction of the drilling rod when the slave arm is in the use position. 4. The drilling rod cleaning unit according to any one of 1 to 4.