JP5912962B2 - Pile driver - Google Patents

Description

  The present invention relates to a pile driving machine, and more particularly to a large pile driving machine in which a leader provided on a base machine is supported by a back stay via a stay holder that can move in the length direction of the leader.

  In a large pile driver, a leader, which can be raised and lowered at the front part of the base machine and supported from behind by a backstay, is transported in a state of being laid down horizontally, so that it is connected to the connecting part between the leader and the backstay. A stay holder movable in the length direction of the leader is provided, and a holder lock for fixing the stay holder at a predetermined position of the leader is provided. This holder lock is generally formed by a lock pin movable in a direction perpendicular to the axis of the reader, a lock hole with which the lock pin is engaged, and a lock cylinder for inserting / removing the lock pin into / from the lock hole. (For example, refer to Patent Document 1).

  In addition, in a pile driving machine that puts the leader backward and lays it horizontally on the base machine for transportation, a rear support cylinder is provided on the rear side of the base machine to support the leader in the lowered state from below. The holder lock is unlocked and the stay holder can be moved until it rises to an appropriate angle from the laid state, and is supported by the rear support cylinder from below, and the holder lock is locked from there until it stands upright. In this state, the stay holder is fixed to the leader, and the leader is supported from the rear side by the back stay (see, for example, Patent Document 2).

Utility Model Registration No. 2569852 JP 2009-228220 A

  The lock pin in the locked state with the stay holder fixed is not only pressed to the lock position engaged with the engagement hole by the lock cylinder, but also held in the lock position by a spring biased in the direction of engagement with the lock hole. In the locked state, it is considered that the lock pin does not come out of the lock hole unless the lock release operation is performed by the lock cylinder. Furthermore, an interlock mechanism using a hydraulic circuit and an electric circuit is also incorporated in an operation switch of the lock cylinder that operates the lock pin. However, if for some reason the lock cylinder malfunctions unexpectedly and the lock pin comes out of the lock hole and the lock state is released, the stay holder will move and the backstay will not be able to support the leader, The leader may fall.

  Therefore, the present invention provides a pile driving machine equipped with a safety mechanism that can more reliably prevent the holder lock from being unlocked in addition to the conventional safety measures using a spring and safety measures using an interlock mechanism. The purpose is to do.

  In order to achieve the above object, a pile driving machine of the present invention includes a leader provided at a front portion of a base machine so as to be able to undulate in a front-rear direction, a backstay that supports the leader from the rear side of the base machine, A stay holder attached to the upper end of a back stay and movable along a guide rail in the longitudinal direction of the leader provided on the rear side of the leader, and a holder lock for fixing the stay holder to a preset position of the leader In the pile driving machine, the holder lock has a lock pin engageable with a lock hole provided on the rear side of the leader in a case part provided in the stay holder, and an engagement position with respect to the lock hole. And a moving means for moving the lock pin to the disengaged position, and an indicator provided on the lock pin on the rear wall of the case portion. A through hole that can project outward from the rear wall at a position where the lock pin is not engaged, a shutter that opens and closes the through hole to restrict the indicator from projecting to the outside, and a direction in which the through hole is closed. An urging means for urging the shutter and an opening operation rope for moving the shutter in a direction to open the through hole are provided.

  Further, in the pile driving machine of the present invention, when the length of the opening operation rope that the opening operation rope hangs downward from the connecting portion with the shutter is equal to or less than a preset tilt angle of the leader Only, the height of the lower end of the opening operation rope is set to a length that enables operation from the ground. Further, the pile driving machine according to the present invention is provided such that the leader is rotatable on a leader arm provided at a front portion of the base machine so as to be able to turn from an upright state toward a rear side of the base machine. In the rear portion, the back stay that supports the reader from the rear in a range from the upright state to the tilt angle, and a rear support cylinder that supports the reader from below in the range from the tilt angle to the horizontal direction. It is characterized by having.

  According to the pile driver of the present invention, the through hole can be opened only when the opening operation rope is operated and the shutter is moved, so that the holder can be operated by simultaneously operating the opening operation rope and the lock cylinder. The lock can be unlocked, and even if the lock cylinder malfunctions when the shutter closes the through hole, the shutter prevents the indicator from protruding outside, and the lock pin comes out of the lock hole. Thus, the lock state is not released, and the lock state can be reliably held with a simple structure. Furthermore, by setting the length of the opening operation rope so that the opening operation rope cannot be operated in a working state or the like, the locked state of the holder lock can be reliably held. Further, when the lock pin is in the non-engagement position, the indicator protrudes to the outside from the through hole, so that it can be confirmed from the outside that the holder lock is unlocked and the stay holder is not fixed to the reader. .

  In addition, when the leader is moved backward from the base machine and the support of the leader is transferred from the backstay to the rear support cylinder, the opening operation rope cannot be operated until the leader is supported from below by the rear support cylinder. By setting the length of the opening operation rope, the holder lock is not released while the reader is tilted backward, and the safety can be greatly improved.

It is a side view of the working state in the pile driving machine which shows one example of this invention. It is a side view which shows the state of the 1st step which also falls a leader back similarly. It is a side view which shows the state of the 2nd step which similarly falls a leader back. Similarly, it is a side view showing a state where the reader is tilted backward in the horizontal direction. It is a cross-sectional side view which shows an example of the holder lock of the state which fixed the stay holder. It is VI-VI sectional drawing of FIG. It is a VII-VII arrow line view of FIG. It is a cross-sectional side view which shows an example of the holder lock of the state which released the stay holder. It is the IX-IX arrow line view of FIG.

  First, as shown in FIG. 1, the pile driving machine 11 shown in this embodiment includes a lower traveling body 12 provided with a crawler and an upper revolving body 13 provided on the lower traveling body 12 so as to be able to swivel. The base machine 14, the leader arm 15 for front / rear adjustment provided at the front part of the upper swing body 13 so as to be swingable in the front / rear direction, and the tip / end of the leader arm 15 so as to be able to undulate in the front / rear direction. A pair of left and right backstays 17 that support the leader 16 from the rear side of the base machine 14 and a rear support that supports the leader 16 that has been tilted rearward from the lower side on the rear side of the base machine 14 And a cylinder 18. The reader 16 is formed of a basic reader 16a whose lower part is attached to the front end of the reader arm 15 so as to be rotatable in the front-rear direction, and an upper reader 16b detachably connected to the upper part of the basic reader 16a. A pair of guide rails 16c for guiding a stay holder 19 provided at the upper end of the back stay 17 so as to be movable in the longitudinal direction of the leader is provided on the upper rear surface side of the basic leader 16a. Further, the stay holder 19 is provided with a holder lock 20 (see FIGS. 5 to 9) for fixing the stay holder 19 to a predetermined position of the reader 16.

  In the working state shown in FIG. 1, the leader arm 15 and the leader 16 are in an upright state, and the holder lock 20 is set in advance in the locked state shown in FIGS. It is in a fixed state. In this working state, a predetermined pile driving operation or the like is performed by moving up and down a working device such as an auger drive provided on the leader 16 so as to be lifted and lowered.

  When the upper leader 16b is removed from the base machine 14 in order to disassemble the pile driving machine 11 into a state suitable for transportation after the work is completed, the leader 16 is placed behind the base machine 14 as shown in FIGS. And lay it down horizontally. First, the operation of tilting the leader 16 in the working state shown in FIG. 1 to the first stage shown in FIG. 2 is performed while the backstay 17 is connected to a predetermined position of the leader 16 via the stay holder 19. The stay cylinder 17a is shrunk, the leader 16 is tilted backward with the tip of the leader arm 15 as the center of rotation, and the intermediate portion of the leader 16 is brought into a first stage state supported by the rear support cylinder 18 from below. . The leader 16 up to the first stage is supported by the leader arm 15 and the backstay 17.

  Next, after the holder lock 20 is unlocked and the stay holder 19 can be moved along the leader 16, the leader arm 15 is rotated forward so that the leader 16 is entirely moved to the base machine 14. It is moved forward to the second stage state shown in FIG. As the leader 16 moves forward, the stay holder 19 moves toward the upper side of the leader 16 along the guide rail 16c. In this state, since the leader 16 is in a state in which the stay holder 19 is movable, the support of the leader 16 by the back stay 17 is removed, and the leader 16 is supported by the leader arm 15 and the rear support cylinder 18.

  Finally, the rear support cylinder 18 is contracted, so that the leader 16 is laid horizontally above the base machine 14 as shown in FIG. After the reader 16 is set in a horizontal state in this way, the upper reader 16b is removed and brought into a transported state.

  As shown in FIGS. 5 to 9, the holder lock 20 for fixing the stay holder 19 to a preset position of the reader 16 includes a pair of sliders 21a that are movably engaged with the pair of guide rails 16c. Preset between the pair of guide rails 16c on the rear side of the reader 16 inside the case portion 23 having the substrate 21 provided and the rear wall 22 provided so as to cover the rear side of the substrate 21. The lock pin 25 engageable with the lock hole 24 provided at the position and the lock pin 25 guided by the guide tube 21b provided on the substrate 21 are engaged with the lock hole 24 via the link 26a. And a lock cylinder 26 which is a moving means for moving in the axial direction to a non-engagement position, and a method of engaging the lock pin 25 with the lock hole 24 A first coil spring 27 that is an urging means that urges the lock pin 25 and a limit switch 28 that is a detection means for detecting that the lock pin 25 is engaged with the lock hole 24 are housed. .

  Further, the rear wall 22 is provided with a through hole 22a through which an indicator 29 provided on the outer end of the lock pin 25 can pass outward, a shutter 30 for opening and closing the through hole 22a, and the through hole 22a. A second coil spring 31 that is an urging means for urging the shutter 30 in the closing direction and an opening operation rope 32 for moving the shutter 30 in the direction to open the through hole 22a are provided. The indicator 29 has a rod or pipe material having a diameter smaller than that of the lock pin 25 attached to the outer end of the lock pin 25 in a straight line. The length of the indicator 29 is the position where the lock pin 25 is engaged. The length is set so as to fit inside the inner surface of the shutter 30 and can largely protrude from the through hole 22a at the non-engagement position. A rear sheave bracket 33 is provided on the upper portion of the case portion 23, and a stay bracket 34 for connecting the upper end of the back stay 17 is provided on each side portion of the case portion 23.

  The shutter 30 is formed in a substantially convex shape with the portion closing the through hole 22a upward, and the upper narrow portion 30a moves up and down on a pair of guide members 35 provided on the outer surface of the rear wall 22. The step 30c between the lower wide portion 30b and the lower wide portion 30b is in contact with the lower end of the guide member 35, so that the upward movement of the shutter 30 is restricted. In addition, at the lower portions on both sides of the wide portion 30b, there are respectively provided locking pieces 36 that are inserted into a pair of vertical holes 22b in the vertical direction provided in the rear wall 22 and project into the case portion 23. The extendable end of the second coil spring 31 is attached to the locking piece 36. Further, a connecting piece 37 for connecting the tip of the opening operation rope 32 protrudes from the center of the bottom of the wide portion 30b, and the connecting piece 37 is guided on the outer surface of the rear wall 22 so as to be movable up and down. In addition, a guide portion 38 that restricts the downward movement of the shutter 30 is provided.

  The length of the opening operation rope 32 is the first stage shown in FIG. 2 when the angle of the leader 16 is equal to or less than a preset tilt angle, that is, the leader 16 is supported by the rear support cylinder 18. When the inclination angle of the reader 16 is reached, the height of the lower end of the opening operation rope 32 that hangs downward from the connecting portion with the connecting piece 37 of the shutter 30 is a height at which an operator can operate from the ground. For example, the length is set to be 1 to 2 m from the ground.

  As shown in FIGS. 5 to 7, the holder lock 20 formed in this manner has a shortened lock cylinder 26 in the range from the working state in which the reader 16 stands upright to the first-stage tilt angle. The lock pin 25 is engaged with the lock hole 24 in a locked state. In this locked state, the urging force of the first coil spring 27 acts to maintain the state in which the lock pin 25 is engaged with the lock hole 24 via the link 26a. Furthermore, the urging force of the second coil spring 31 holds the shutter 30 at a position where the through hole 22a is closed, and the shutter 30 prevents the indicator 29 from projecting outside through the through hole 22a.

  Thus, the lock pin 25 is held in engagement with the lock hole 24 by the lock cylinder 26 and the first coil spring 27, and movement in the direction of coming out of the lock hole 24 is restricted by the shutter 30. Therefore, even if the hydraulic pressure in the shortening direction of the lock cylinder 26 expires for some reason, the locked state is held by the first coil spring 27, and further, the hydraulic pressure in the extension direction is applied to the lock cylinder 26 by the first coil spring 27. Even if the force is stronger than the urging force, the shutter 30 prevents the lock pin 25 from moving in the pulling direction, so that the holder lock 20 is not expected to be locked in the range between the working state and the first stage. The state in which the back stay 17 supports the leader 16 through the stay holder 19 can be reliably maintained without being released.

  Further, it is possible to confirm that the holder lock 20 is locked in the cab by lighting the lamp provided in the cab by operating the limit switch 28, and the holder 29 can be locked even outside since the indicator 29 does not protrude to the outside. It can be confirmed that 20 is locked.

  When shifting from the first stage shown in FIG. 2 to the second stage shown in FIG. 3, the lower end portion of the opening operation rope 32 that has been lowered to the operable height is pulled downward, and the second coil spring 31 The shutter 30 is moved to a position where the shutter 30 opens the through hole 22a against the urging force, and the lock cylinder 26 is operated in the extending direction by an operation in the cab, and the lock pin 25 is locked through the link 26a. 24, and the engagement state between the lock pin 25 and the lock hole 24 is released. At this time, since the through hole 22a is open, the indicator 29 protrudes to the outside through the through hole 22a as the lock pin 25 moves in the removal direction, and the unlocked state shown in FIGS. The unlocked state of the holder lock 20 can be confirmed in the cab with a lamp or the like by the operation of the limit switch 28, and can also be confirmed from the outside by the projection of the indicator 29 to the outside of the rear wall. By using the indicator 29 colored in a conspicuous color tone, it is possible to easily confirm the appearance state of the indicator 29.

  By releasing the lock state of the stay holder 19 by the holder lock 20 in this way, the stay holder 19 becomes movable along the guide rail 16c. Therefore, when the leader arm 15 is rotated forward, The position of the stay holder 19 with respect to the base machine 14 does not change, and the leader 16 moves forward to enter the second stage shown in FIG. At this time, when the pulling force of the opening operation rope 32 is released, the shutter 30 moves in a direction to close the through hole 22a by the biasing force of the second coil spring 31, and the shutter 30 is placed on the side surface of the indicator 29 protruding from the through hole 22a. Stops at the position where the upper edge of the abuts. Then, by contracting the rear support cylinder 18, as shown in FIG. 4, the leader 16 lies horizontally above the base machine 14, and in this state, the upper leader 16b is removed to bring it into a transport state. can do.

  Conversely, when changing from the transported state to the working state, after attaching and connecting the upper leader 16b to the basic leader 16a (the state shown in FIG. 4), the rear support cylinder 18 is extended (the state shown in FIG. 3), and the leader arm 15 is moved. It turns toward the back (state of FIG. 2). Then, the lock cylinder 25 is operated in the shortening direction by aligning the positions of the lock pin 25 and the lock hole 24, and the lock pin 25 is inserted into the lock hole 24 through the link 26a. At this time, when the lock pin 25 moves toward the lock hole 24, the indicator 29 is drawn into the case portion 23 from the through hole 22 a and the shutter 30 is movable, and the urging force of the second coil spring 31. Thus, the shutter 30 moves to a position where the through hole 22a is closed.

  In other words, when the lock pin 25 is engaged with the lock hole 24, the shutter 30 automatically moves to a position that prevents the lock state from being released by automatically restricting the movement of the lock pin 25 in the removal direction. . In addition, the fact that the lock pin 25 is engaged with the lock hole 24 and the stay holder 19 is in a locked state can be easily confirmed from the outside because the indicator 29 enters the case portion 23 and is not visible from the outside. it can.

  Thus, since the pile driver shown in this embodiment must release the holder lock 20 at the same time, the operation of the opening operation rope 32 outside and the operation of the lock cylinder 26 in the cab are performed simultaneously. Even if the lock cylinder 26 malfunctions in the range from the work state in which the reader 16 is upright to the first-stage tilt angle, the holder lock 20 will not be unlocked, and the stay holder 19 is attached to the predetermined position of the reader 16. The reader 16 can be held in a position and reliably supported by the backstay 17.

  Furthermore, until the leader 16 is tilted to the tilt angle of the first stage, the shutter 30 is not accidentally opened by setting so that the lower end of the opening operation rope 32 is not naturally reached. Even if the shutter 30 is accidentally opened, the lock holder 26 is not operated unless the lock cylinder 26 is operated in the cab, so that the stay holder 19 does not move and the back stay 17 does not remove the support of the reader 16.

  Further, by providing a rope locking portion for locking the lower end portion of the opening operation rope 32 during operation at the lower portion of the leader 16, it is possible to prevent the opening operation rope 32 from shaking due to wind or vibration during operation.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Lower traveling body, 13 ... Upper turning body, 14 ... Base machine, 15 ... Leader arm, 16 ... Leader, 16a ... Basic leader, 16b ... Upper leader, 16c ... Guide rail, 17 ... Back Stay, 17a ... Stay cylinder, 18 ... Rear support cylinder, 19 ... Stay holder, 20 ... Holder lock, 21 ... Substrate, 21a ... Slider, 21b ... Guide tube, 22 ... Rear wall, 22a ... Through hole, 22b ... Long hole, DESCRIPTION OF SYMBOLS 23 ... Case part, 24 ... Lock hole, 25 ... Lock pin, 26 ... Lock cylinder, 26a ... Link, 27 ... 1st coil spring, 28 ... Limit switch, 29 ... Indicator, 30 ... Shutter, 30a ... Narrow part, 30b ... Wide portion, 30c ... Step portion, 31 ... Second coil spring, 32 ... Opening rope, 33 ... Rear sheave bracket, 4 ... the stay bracket 35 ... guide member, 36 ... engaging piece 37 ... connecting piece, 38 ... guide portion

Claims (3)

  A leader provided at the front part of the base machine so as to be able to undulate in the front-rear direction, a back stay for supporting the leader from the rear side of the base machine, and a rear side attached to the upper end of the back stay A pile driver comprising a stay holder movable along a guide rail in a longitudinal direction of the leader, and a holder lock for fixing the stay holder to a preset position of the leader. A lock pin engageable with a lock hole provided on the rear side of the reader in a case part provided in the stay holder, and a moving means for moving the lock pin to an engagement position and a non-engagement position with respect to the lock hole And an indicator provided on the lock pin on the rear wall of the case portion is located outside the rear wall at the lock pin non-engagement position. A projecting through hole; a shutter that opens and closes the through hole to restrict projection of the indicator to the outside; an urging means that urges the shutter in a direction to close the through hole; and the through hole is opened. A pile driving machine comprising an opening operation rope for moving the shutter in a direction.   The opening operation rope has a height at the lower end of the opening operation rope only when the length of the opening operation rope that hangs downward from the connecting portion with the shutter is equal to or less than a preset tilt angle. The pile driver according to claim 1, wherein the length is set to a length at which the height is operable from the ground.   The reader is provided on a leader arm provided at a front portion of the base machine so as to be pivotable in a direction that falls from the upright state toward the rear of the base machine, and at the rear portion of the base machine, the reader is in an upright state. The back stay for supporting the leader from the rear in a range from the tilt angle to the tilt angle, and a rear support cylinder for supporting the leader from below in the range from the tilt angle to the horizontal direction. The pile driver according to 1 or 2.

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