JPH0790845A - Pile driver - Google Patents

Abstract

PURPOSE:To obtain strong thrust by driving an ascending-lowering frame directly so as to be elevated by using a hydraulic cylinder as well as to enable switching to driving by an endless chain according to necessity. CONSTITUTION:Rack members 12A and 12B and an endless chain 6 capable of driving travel are arranged in a leader, and a main ascending-lowering frame 8 which is supported with the leader so as to be elevated and is equipped with an auger machine and a sub-ascending-lowering frame 10 connected to this through an ascending-lowering driving hydraulic cylinder 11 on the upper side of a main ascending-lowering frame 8, are provided. An engaging rotary body 15 to be engaged with the endless chain 6 is pivotally supported by the main ascending-lowering frame 8, and an engaging rotary body lock mechanism 16 is arranged to hold the engaging rotary body 15 in an nonrotating condition, and a sub-ascending-lowering frame lock mechanism 21 is arranged on the sub-ascending-lowering frame 10.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driver equipped with an auger machine on a lifting frame that moves up and down along a leader. Particularly, the present invention uses a hydraulic cylinder to drive the lifting frame up and down. The present invention relates to a pile driver that can selectively perform up-and-down drive by the hydraulic cylinder and up-and-down drive by an endless chain.

[0002]

2. Description of the Related Art In a conventional pile driver, an elevating frame is driven up and down by an endless chain traveling along a leader, an endless chain fixed to the upper and lower ends of a leader, and a chain of this chain. A chain drive system is often adopted, which comprises a pair of upper and lower guide sprockets engaged on the front side and a drive sprocket engaged on the back side of the chain between the guide sprockets.

[0003]

According to these chain drive systems, since the rotational force of the prime mover is converted into a linear thrust force by the chain, a continuous and uniform thrust force can be obtained, and the thrust force is relatively high. Although it is sufficient for driving piles etc. on soft ground, it was not suitable when the ground was relatively hard and strong thrust was required.

In view of the above, the present invention utilizes a hydraulic cylinder, and the elevating and lowering frame directly drives the elevating frame to move up and down to obtain a strong thrust, and does not require such a strong thrust. In such a case, it is an object of the present invention to provide a pile driver in which the drive by the hydraulic cylinder can be switched to the drive by a chain.

[0005]

In the pile driving machine according to the first aspect of the present invention, a leader 1 is provided with a rack member extending over the entire length thereof, and an endless chain 6 which can be driven along the leader 1. The main elevating frame 8 which is provided with an auger machine 9 and is supported by the reader 1 so as to be able to elevate and lower, and an upper and lower side of the main elevating frame 8 through which an elevating drive hydraulic cylinder 11 is provided. A sub-elevating frame 10 connected to the main elevating frame 8 is provided on the main elevating frame 8 so as to axially attach a chain connecting hook 15 for engaging the endless chain 6 and to hold the hook rotating body 15 in a non-rotating state. The engaging rotary member locking mechanism 16 is provided, and the sub-elevation frame 10 holds an engaging body capable of engaging with a rack member at an arbitrary engaging position with the rack member so that the sub-elevation frame can be held. Characterized by comprising providing a sub lift frame locking mechanism 21 to prevent upward movement or downward movement of the arm 10.

In the pile driving machine according to a second aspect of the present invention, the engaging rotary member lock mechanism 16 is engaged with the ratchet wheel 18a provided on one end side of the rotary shaft 17 of the engaging rotary member 15 and the ratchet wheel 18a. A forward rotation preventing means 16A including a lock claw 19a for preventing the rotation shaft 17 from rotating in the forward direction, and an engagement / disengagement cylinder 20a pivotally attached to the lock claw 19a for engaging and disengaging the claw 19a with respect to the ratchet wheel 18a. Rotating shaft 1 of hooking rotating body 15
7, a ratchet wheel 18b provided on the other end side, a lock claw 19b that engages with the ratchet wheel 18b to prevent reverse rotation of the rotary shaft 17, and a lever claw 19b pivotally mounted on the lock nail 19b. Cylinder 20b for engagement and disengagement with respect to 18b
And a reverse rotation preventing means 16B.

In the pile driver according to the third aspect of the present invention, the pair of rack members 12A and 1A for raising and lowering the leader 1 is used.
2B are arranged side by side, and the sub-elevating frame 10 is composed of a raising lock mechanism 21A and a lowering lock mechanism 21B,
The ascending lock mechanism 21A includes an ascending hook claw 22a that engages with the ascending rack member 12A and an ascending / disengaging drive cylinder 23a that disengages the engaging claw 22a from the ascending rack member 12A. 21B
Is a lowering hook 2 that engages the lowering rack member 12B.
2b and the engaging and disengaging drive cylinder 23b for engaging and disengaging the engaging claw 22b with the descending rack member 12B.

[0008]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1 showing the entire pile driver and FIG. 4 showing the overall schematic structure, 1 is a leader, which is held vertically by a crawler crane 2 via a boom 3 and an arm 4 on the ground, and on the front surface of the leader 1. Along the pair of guide rails 5, 5
Is provided. Reference numeral 6 denotes an endless chain arranged in the leader 1 so as to travel vertically between the guide rails 5 and 5, and is driven to be driven by a drive sprocket 7 which is interlocked with a chain drive motor (not shown). Reference numeral 8 denotes a main elevating frame which is supported by guide rails 5 and 5 so as to be able to ascend and descend. The main elevating frame 8 is equipped with an auger machine 9. Reference numeral 10 denotes a sub-elevating frame arranged above the main elevating frame 8, and the main elevating frame 8 is provided via a pair of hydraulic cylinders 11 for elevation driving on both sides.
Is connected with.

As shown in FIGS. 2 and 3, the leader 1 is provided with a pair of rack members 12A, 12B on both sides for raising and lowering extending over the entire length of the leader 1, both guide rails 5, 5.
5, which are arranged side by side along the inside of the rack 5,
A has upward rack teeth 12a, and the descending rack member 12B has downward rack teeth 12b. The endless chain 6 includes the rack members 12A, 1
It is arranged so that it can run between 2B.

FIG. 5 schematically shows the arrangement of the main parts of this pile driver from the front side. The main elevating frame 8 is composed of an inner frame 13 held by the guide rails 5 and 5 so as to be able to ascend and descend, and an outer frame 14 pivotally attached to the inner frame 13 so as to be openable and closable. 5 and 7, only the inner frame 13 is shown for the sake of clarity, and the outer frame 14 is shown in FIGS. 6 and 10 to 12.

As shown in FIGS. 5 to 7, the inner frame 13 of the main elevating frame 8 is provided with a chain-rotating engagement rotating body 15 such as a sprocket that engages with the endless chain 6.
Is attached to the shaft, and an engaging rotary member locking mechanism 16 for holding the engaging rotary member 15 in a non-rotating state is provided. The engagement rotating body 15 is fixed to the center of a rotating shaft 17 that is mounted on the inner frame 13. The engaging rotary member locking mechanism 16 is composed of a forward rotation preventing means 16A and a reverse rotation preventing means 16B. The forward rotation preventing means 16A is a ratchet wheel 18a fixed to one end of the rotary shaft 17, and this ratchet wheel. A lock claw 19a engaged with 18a to prevent the rotation shaft 17 from rotating in the forward direction, and a lock / disengage cylinder 20a pivotally mounted on the lock claw 19a to disengage the lock claw 19a from the ratchet wheel 18a (hydraulic cylinder). Composed of. Further, the reverse rotation preventing means 16B includes a ratchet wheel 18b fixed to the other end of the rotary shaft 17, a lock hook 19b that engages with the ratchet wheel 18b and blocks the normal rotation of the rotary shaft 17, and a lock hook. It is composed of an engagement / disengagement cylinder 20b (hydraulic cylinder) which is pivotally attached to 19b and engages / disengages the lock claw 19b with the ratchet wheel 18b.

The sub-elevation frame 10 is provided with a sub-elevation frame lock mechanism 21 for preventing the sub-elevation frame 10 from moving up or down. The lock mechanism 21 includes a raising lock mechanism 21A and a lowering lock mechanism. The lifting lock mechanism 21A includes a lifting engaging claw 22a that engages with the elevating rack member 12A and an elevating engagement / disengagement drive cylinder 23a that disengages the engaging claw 22a from the elevating rack member 12A. The lowering lock mechanism 21B is composed of a (hydraulic cylinder), and the lowering locking mechanism 21B is engaged with the lowering rack member 12B.
It is composed of a descending engagement / disengagement drive cylinder 23b (hydraulic cylinder) for engaging and disengaging the 2b with respect to the descending rack member 12B.

As shown in FIGS. 6, 10 and 11, the inner frame 13 of the main elevating frame 8 can be moved up and down to the guide rails 5 and 5 through a plurality of guide rollers 24 provided on the back side thereof. Supported on the outer frame 14
Is horizontally pivotally attached to one end of the inner frame 13 by a support shaft 25 parallel to the reader 1, and can be opened and closed with respect to the inner frame 13. 12
11 shows a state in which the outer frame 14 is horizontally rotated from the closed position shown in FIG. 11 about the support shaft 25 to be opened. Further, the auger machine 9 has a drive motor 26.
And a joint portion 28 that connects a head of an auger screw 27 or the like to the motor 26 so as to be able to rotate integrally. The rotary drive motor 26 is concentrically mounted on the support shaft 25, and the joint portion 28 is mounted on the outer frame 14 It is provided in.

The drive motor 26 is composed of a hydraulic motor, is rotatably supported by the support shaft 25, and is held by the support frame portion 14a of the outer frame 14. The joint portion 28 is rotatably held by the support frame portion 14a around an axis parallel to the reader 1 via a bearing 36, and a tubular body 29 into which the auger screw 27 or the like can be fitted, and the tubular body 29. An auger screw or the like 27 fixed to the upper end of the body 29 and fitted into the tubular body 29
Plate 30 that is detachably connected to the head of the user
And a sprocket 31 is provided at the lower end of the outer peripheral surface of the tubular body 29.
The chain 33 is hooked on the sprocket 32 provided on the output shaft 26a of the drive motor 26, and the tubular body 29 is rotationally driven by the activation of the drive motor 26.

At the center of the lower surface of the joint plate 30,
As shown in FIG. 10, a connecting cylinder portion 34 having a hexagonal hole 34a into which a hexagonal columnar connecting head 27a protruding from the auger screw 27 is fitted. When connecting the joint plate 30, the auger screw 27 or the like is fitted into the tubular body 29, and the head thereof is projected upward from the tubular body 29. The joint member 30 is attached to the head of the auger screw 27 by fitting the joint cylinder 30 of the auger screw or the like 27 by externally fitting the joint cylinder portion 34 and inserting the joint pin 35 into the pin insertion holes penetrating the joint head 27a and the joint cylinder portion 34. After connecting, the joint member 30 is connected to the tubular body 2.
It may be bolted to the upper end of 9.

The usage mode of the pile driver having the above-mentioned structure will be described in detail below. First, a case where the main lift frame 8 and the sub lift frame 10 are moved up along the leader 1 from the lower side by using the lift drive hydraulic cylinder 11 will be described with reference to FIGS. At the time of this upward movement, the traveling drive of the endless chain 6 is stopped, and as shown in FIG. 7A, the reverse rotation preventing means 16B of the engaging rotary body lock mechanism 16 is operated, and the engaging / disengaging cylinder 20b is used. Lock claw 19b
Is engaged with the ratchet wheel 18b (see FIG. 7), whereby the engaging rotating body 15 engaged with the endless chain 6 is held by the non-rotating body. In addition, the raising lock mechanism 21A of the sub-elevation frame lock mechanism 21 has its raising hooks 22a attached to the raising rack member 12A as shown in FIG.
Let's leave from. The lifting drive hydraulic cylinder 11 is contracted to the stroke end.

Then, as shown in FIG. 13B, the sub-elevating frame 10 is moved upward by a predetermined stroke by extending and lowering the hydraulic cylinder 11 for raising and lowering, and then the raising lock mechanism 21A is actuated. Lifting hook 22
By engaging a with the lifting rack member 12A,
The sub-elevation frame 10 is prevented from moving downward, and the sub-elevation frame 10 is held at a position moved upward by a predetermined stroke.
After that, the engagement / disengagement cylinder 20 of the reverse rotation preventing means 16B.
b is disengaged from the lock claw 19b so that the engaging rotary body 15 can be rotated.

From such a state, as shown in FIG.
The main lifting frame 8 moves upward by contracting the lifting drive hydraulic cylinder 11 to the stroke end. As a result, both the main elevating frame 8 and the sub elevating frame 10 move upward from the position shown in FIG. 13A by a predetermined stroke. After that, FIG. 13 (A) to (C)
By repeating the above operation in sequence, the main lifting frame 8
Also, the sub-elevation frame 10 can be moved up and down along the leader 1 to a required height.

Next, the lifting / lowering hydraulic cylinder 11 is also used.
14A to FIG. 14A to FIG. 14C in the case where the main elevating frame 8 and the sub elevating frame 10 are moved down from the upper end portion of the reader 1 when press-fitting an auger screw or the like using
This will be described with reference to (C). Even during this downward movement, the traveling drive of the endless chain 6 is stopped. And
As shown in FIG. 3A, the forward rotation preventing means 16A of the engaging rotating body lock mechanism 16 is operated to engage and disengage the cylinder 20.
The lock claw 19a is engaged with the ratchet wheel 18a by a (Fig. 6).
(Refer to FIG. 4), by this, the engaging rotating body 15 engaged with the endless chain 6 is held by the non-rotating body. The descending lock mechanism 21B of the sub-elevation frame lock mechanism 21 is
As shown in FIG. 7A, the lifting hook 22b is disengaged from the lifting rack member 12B to be unlocked. The lifting drive hydraulic cylinder 11 is extended to the stroke end.

As shown in FIG. 14B, however, the sub-elevating frame 10 is moved downward by a predetermined stroke by operating the lifting drive hydraulic cylinder 11 to contract from the extended state shown in FIG. 14A. The locking mechanism 21B is operated, and the lifting hook 22b is moved to the lower rack member 12B.
By engaging with the sub-elevation frame 10, the sub-elevation frame 10 is prevented from moving upward, and the sub-elevation frame 10 is held at a position where the sub-elevation frame 10 has moved downward by a predetermined stroke. After that, the forward rotation preventing means 1
The lock claw 19a is disengaged from the ratchet wheel 18a by the engagement / disengagement cylinder 20a of 6A, and the engaging rotary body 15 is made rotatable.

From such a state, as shown in FIG.
The main lifting frame 8 is moved downward by extending the lifting drive hydraulic cylinder 11 to the stroke end. As a result, the main elevating frame 8 and the sub elevating frame 10 both move downward from the position shown in FIG. 14A by a predetermined stroke. After that, FIG. 13 (A) to (C)
By repeating the above operation in sequence, the main lifting frame 8
Also, the sub-elevation frame 10 can be moved down along the leader 1. During this downward movement, the pushing force of the lifting / lowering hydraulic cylinder 11 directly acts on the main lifting / lowering frame 8, so that a strong thrust can be applied to the auger screw, pile, etc. connected to the main lifting / lowering frame 8. .

Further, using the endless chain 6,
A case where the main elevating frame 8 is moved up and down together with the sub elevating frame 10 will be described with reference to FIGS. First, in the case of the downward movement, as shown in FIG. 15 (A), the reverse rotation preventing means 16 of the engaging rotary body lock mechanism 16 is used.
B is operated to engage the lock claw 19b with the ratchet wheel 18b by the engagement / disengagement cylinder 20b, whereby the engagement rotating body 15 engaged with the endless chain 6 is held in a non-rotating state. Further, as shown in FIG. 15A, the lifting lock mechanism 21A of the sub-elevation frame lock mechanism 21 has its lifting hooks 22a attached to the lifting rack member 12A.
Let's leave from. The lifting drive hydraulic cylinder 11 may be in an extended state as shown in FIG. Then, from such a state,
By driving the endless chain 6 to run downward as indicated by the arrow, the endless chain 6 is not rotated.
The engaging rotating body 15 engaged with is pulled downward by the chain 6, whereby the main elevating frame 8 is continuously lowered together with the sub elevating frame 10.

In the case of upward movement, FIG. 15 (B)
As described above, the forward rotation preventing means 1 of the engagement rotating body lock mechanism 16
6A is actuated to engage the lock claw 19a with the ratchet wheel 18a by the engagement / disengagement cylinder 20a, whereby the engagement rotating body 15 engaged with the endless chain 6 is held as a non-rotating body. Further, in the descending lock mechanism 21B of the sub-elevation frame lock mechanism 21, as shown in the figure, the ascending engagement claws 22b are detached from the ascending rack member 12B. The lifting drive hydraulic cylinder 11 is in an extended state or a contracted state. Then, from such a state, the endless chain 6 is driven to run upward as indicated by the arrow, whereby the engagement rotating body 15 engaged with the endless chain 6 in the non-rotation state is pulled upward by the chain 6, Thereby, the main elevating frame 8 and the sub elevating frame 10 continuously move upward.

In the embodiment described above, the engaging rotary member 15
Rotating member lock mechanism 16 for holding the non-rotating state
Is constituted by two means, a forward rotation prevention means 16A and a reverse rotation prevention means 16B. The lock mechanism 16 is
It can also be constituted by one means capable of arbitrarily preventing rotation in either forward or reverse directions at one location. Further, in the embodiment, two types of rack members, that is, the raising rack member 12A and the lowering rack member 12B are installed side by side in the leader 1, and the sub-elevation frame lock mechanism sub-elevation frame lock mechanism 21 is used as the elevation lock mechanism 21A. Although it is configured with the lowering lock mechanism 21B, also with respect to this, by providing a lock mechanism that can selectively prevent the upward movement and the downward movement of the sub-elevation frame 10, one rack member can be used. I can finish it. Further, with respect to the ascending lock mechanism 21A and the descending lock mechanism 21B, engaging claws 22a, 22 that engage with the rack members 12A, 12B.
Although b is used, a pinion may be used instead of such a nail.

[0025]

In the pile driver according to the first aspect of the present invention, the lifting cylinder can be lifted by properly using the lifting drive hydraulic cylinder and the traveling endless chain. What you can do, first,
When the lifting frame is moved up along the leader by using the lifting / lowering hydraulic cylinder, the traveling drive of the endless chain is stopped. Then, the engaging rotating body lock mechanism is operated to hold the engaging rotating body engaged with the endless chain in a non-rotating state, the sub-elevating frame lock mechanism is unlocked, and the lifting drive hydraulic cylinder is contracted. In this state, the lifting / lowering hydraulic cylinder is extended to move the sub-elevation frame upward by a predetermined stroke, and then the sub-elevation frame lock mechanism is operated to lock the sub-elevation frame. , Its downward movement is blocked, and it is held at a position moved upward by a predetermined stroke. After that, from the state in which the holding of the engaging rotating body by the engaging rotating body lock mechanism is released, the lifting / lowering drive hydraulic cylinder is contracted to move the main lifting frame upward, and the auxiliary lifting frame moves upward accordingly. . By repeating the above operation in sequence, the main elevating frame and the sub elevating frame can be moved up along the leader to the required height.

Similarly, when the lifting / lowering drive hydraulic cylinder is used to move the lifting / lowering frame downward along the leader, the driving of the endless chain is stopped, and the hooking rotary member locking mechanism is used. While holding the sub-elevation frame to the non-rotating body, the sub-elevation frame lock mechanism is unlocked, and the vertical drive hydraulic cylinder is extended. After moving down by a predetermined stroke, the sub-elevation frame lock mechanism is activated to lock the sub-elevation frame.
It is prevented from moving upward and is held at a position moved downward by a predetermined stroke. After that, from the state in which the holding of the engaging rotary body by the engaging rotary body lock mechanism is released, the lifting / lowering drive hydraulic cylinder is extended to move the main lifting frame downward, and the auxiliary lifting frame moves downward accordingly. . By repeating the above operation, the main elevating frame and the sub elevating frame can be moved down along the leader.
During the downward movement, the pushing force of the lifting / lowering hydraulic cylinder directly acts on the main lifting frame, so that a large thrust can be applied to the auger screw, the pile, etc. connected to the main lifting frame.

On the other hand, when the elevating frame is moved down using the endless chain, the engaging rotary member locking mechanism is operated while the elevating drive hydraulic cylinder is extended or contracted to engage and rotate. The body is held in a non-rotating state, and the sub-elevation frame lock mechanism is unlocked.From this state, the endless chain is driven downward along the leader to drive the endless chain in a non-rotating state. The engaging rotating body engaged with the chain is pulled downward by this chain, and the main elevating frame can be continuously moved downward together with the sub elevating frame. Also, in the case of ascending movement, as in the case of descending, the engaging rotating body lock mechanism holds the engaging rotating body in a non-rotating body while the elevating drive hydraulic cylinder is extended or contracted, and the sub-elevating frame lock is performed. When the mechanism is unlocked and the endless chain is driven upward from this state, the engaging rotating body that engages with the endless chain in the non-rotating state is pulled upward by this chain, and the main elevating frame The sub-elevation frame can be continuously moved up.

As described above, according to this pile driving machine, the lifting / lowering hydraulic cylinder can be used to move the main lifting / lowering frame up and down by its expansion / contraction operation, and particularly during the lowering movement. Since the pushing force of the lifting / lowering hydraulic cylinder can be directly applied to the main lifting / lowering frame, a strong thrust can be applied to the auger screw, the pile or the like connected to the main lifting / lowering frame. Further, in the case where such a large thrust force is not required, the drive by the lifting / lowering hydraulic cylinder can be switched to the drive by the chain.

According to a second aspect of the present invention, there is provided a pawl wheel provided with the engaging rotary member locking mechanism at one end side of the rotary shaft of the engaging rotary member, and a lock pawl for engaging with the pawl wheel to prevent forward rotation of the rotary shaft. A forward rotation preventing means, which comprises a disengagement cylinder pivotally attached to the lock claw to disengage the claw from the claw wheel, and a claw wheel provided on the other end side of the rotary shaft of the engaging rotary body. And a reverse rotation preventing means including a lock claw that engages with the ratchet wheel to prevent the rotation shaft from rotating in the reverse direction, and a reverse engaging means that includes an engagement / disengagement cylinder pivotally attached to the lock claw to disengage the lock claw from the ratchet wheel. In this case, the engaging rotating body lock mechanism does not become complicated, its manufacture is simple, and its control is easy.

According to a third aspect of the present invention, the reader is provided with a pair of rack members for raising and lowering side by side, and the sub-elevating frame lock mechanism is constituted by the raising lock mechanism and the lowering lock mechanism. , The raising lock mechanism is composed of a raising engaging pawl that engages with the raising rack member and a raising engagement disengagement drive cylinder that engages and disengages the engaging pawl with the raising rack member, and the lowering lock mechanism descends. If the lowering hook is engaged with the lower rack member and the lowering engagement / disengagement drive cylinder that disengages the engaging hook from the lowering rack member, the sub-elevation frame lock mechanism is operated reliably. And its control is easy, and its manufacture is simple.

[Brief description of drawings]

FIG. 1 is an overall schematic side view of a pile driver showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of a guide rail and a rack member provided with a leader.

FIG. 3 is a cross-sectional view of the leader, guide rails, rack members, etc. shown in FIG.

FIG. 4 is a schematic side view showing a schematic arrangement configuration of the entire pile driver.

FIG. 5 is a schematic front view showing the arrangement configuration of the main parts of the pile driver.

6 is an enlarged cross-sectional view taken along line VV of FIG.

FIG. 7 is an enlarged cross-sectional view taken along line WW of FIG.

8 is an enlarged cross-sectional view taken along line XX of FIG.

9 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 10 is a front view of a main elevating frame and an auger machine equipped with the main elevating frame.

11 is a plan view of the main elevating frame and the auger machine shown in FIG. 10, showing a state in which the main elevating frame is closed.

FIG. 12 is a plan view similar to FIG. 11, showing a state in which the main lifting frame is open.

13 (A), (B), and (C) are explanatory views showing operating states when the lifting frame is moved upward by using the lifting drive hydraulic cylinder.

14 (A), (B) and (C) are explanatory views each showing an operating state when the lifting frame is moved downward by using the lifting drive hydraulic cylinder.

15 (A) and 15 (B) are explanatory views showing operating states at the time of lowering movement and ascending movement of the elevating frame by using the endless chain, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 leader 5 guide rail 6 endless chain 8 main lifting frame 9 auger machine 10 auxiliary lifting frame 11 hydraulic cylinder for lifting drive 12A raising rack member 12B lowering rack member 13 inner frame 14 outer frame 15 engaging rotating body 16 engaging rotating body lock Mechanism 17 Rotating Shaft 18a Claw Wheel 18b Claw Wheel 19a Lock Claw 19b Lock Claw 20a Engagement / Disengagement Cylinder 20b Engagement / Disengagement Cylinder 21 Sub-elevation Frame Locking Mechanism 21A Lifting Lock Mechanism 21B Descending Locking Mechanism 22a Engaging Claw 22b Engaging claw (engaging body) 23a Lowering engagement / disengagement drive cylinder 23b Lowering engagement / disengagement drive cylinder 25 Spindle 26 Drive motor 28 Joint section

Claims (3)

[Claims] 1. A leader is provided with a rack member extending the entire length thereof and an endless chain capable of traveling along the leader, and is equipped with an auger machine so as to be vertically supported by the leader. An elevating frame and an auxiliary elevating frame connected to the main elevating frame above or below the main elevating frame via an elevating and lowering hydraulic cylinder are provided, and the main elevating frame is used for chain connection with an endless chain. A hook rotating body lock mechanism is provided for axially mounting the hook rotating body and holding the hook rotating body in a non-rotating state, and an engaging body engageable with a rack member is optionally provided on the sub-elevating frame with the rack member. And a sub-elevation frame lock mechanism for preventing the sub-elevation frame from moving up or down by holding the sub-elevation frame at the engaging position. 2. The engaging rotary member lock mechanism includes a ratchet wheel provided on one end side of a rotary shaft of the engaging rotary member, a lock pawl that engages with the ratchet wheel to prevent forward rotation of the rotary shaft, and this lock. A forward rotation preventing means composed of an engagement / disengagement cylinder pivotally attached to the claw for engaging and disengaging the claw with the claw wheel, a claw wheel provided on the other end side of the rotating shaft of the engaging rotary body, and a claw wheel engaged with the claw wheel. It is constituted by a lock claw for preventing reverse rotation of the rotary shaft, and a reverse rotation preventing means composed of an engagement / disengagement cylinder pivotally attached to the lock claw for engaging / disengaging the lock claw with respect to the ratchet wheel. The pile driver according to claim 1. 3. A pair of rack members for raising and lowering are installed side by side on the leader, and the sub-elevating frame lock mechanism is constituted by a raising lock mechanism and a lowering lock mechanism, and the raising lock mechanism comprises: The lifting lock member includes a lifting hook that engages with the lifting rack member and a lifting engagement / disengagement drive cylinder that disengages the hooking member from the lifting rack member, and the lowering lock mechanism engages the lowering hook member that engages the lowering rack member. 2. A claw and a descending engagement / disengagement drive cylinder for engaging and disengaging the engaging claw with the descending rack member.
Alternatively, the pile driving machine according to claim 2.