JP5653763B2 - Pile driver - Google Patents

Description

  The present invention relates to a pile driving machine, and more particularly, to a pile driving machine in which a leader is tiltably provided at a front portion of an upper turning body that is turnably provided on a lower traveling body.

  The pile driving machine is provided with an upper turning body on a lower traveling body through a turning means so as to be turnable, and a leader is tiltably provided at a front portion of the upper turning body through a front bracket. Work such as excavation is performed by supporting a back stay provided on the revolving structure and moving up and down a working device such as an auger drive device along the leader. As such a pile driver, the reader is divided into a basic reader (lower reader) attached to the front bracket and a plurality of extension readers (upper reader) connected to the upper portion of the basic reader, A pile driver with a structure that can be easily switched between a transport state and a working state without attaching or detaching the back stay by sliding the back stay to the upper back of the basic leader and the back of the extension leader is known. Yes. (For example, refer to Patent Document 1).

JP 2009-293352 A

  As described above, when a pair of the same backstay supports the state in which the extension reader is connected to the basic reader and the state in which the extension reader is not connected to the basic reader (a state in which only the basic reader is connected), the maximum backstay The length needs to be set to a length that allows the reader to tilt with the extension reader connected to the basic reader, and the minimum length of the backstay needs to be set according to the state of the basic reader only. . For this reason, when the basic leader alone is used, the backstay is contracted to a minimum length. Therefore, if the backstay is greatly extended with the basic leader alone, the basic leader The lower leader moves greatly in the direction of the upper swing body and the lower traveling body, and the basic leader can be tilted forward until the lower rear surface of the basic leader hits the lower front end of the upper swing body.

  Also, in normal work, it does not run or swivel in a state where the leader is largely tilted forward, and there is no problem if it is run accidentally, but depending on the forward tilt angle of the leader, When the upper swinging body is swung, the lower part of the basic leader collides with the front end of the lower traveling body, which may damage the lower traveling body and the leader.

  Therefore, the present invention provides a pile driving device that can protect the lower traveling body and the leader by preventing the upper turning body from turning even if the upper turning body is erroneously turned with the leader largely tilted forward. The purpose is to provide a machine.

In order to achieve the above object, a pile driving machine of the present invention includes a lower traveling body, an upper revolving body provided on the lower traveling body via a turning means, and a front revolving body. In a pile driving machine comprising a leader attached to a provided front bracket so as to be tiltable, and a backstay provided between the leader and the upper swing body, before detecting the forward tilt angle of the leader An inclination angle detection means, and when the upper swing body is swung, a tilt allowable angle is set in advance so that the lower part of the leader in the forward tilt state does not collide with the front end of the lower traveling body, and the forward tilt angle It is characterized by comprising a turning operation suppressing means for suppressing the turning operation of the turning means when the forward inclination angle of the reader detected by the detecting means exceeds the allowable inclination angle .

Further, in the pile driving machine of the present invention, the leader is pivotally supported by the front bracket in a state where the axis of the leader support shaft fixed to the lower part of the leader is oriented in the width direction of the upper swing body, and the forward tilting is performed. An angle detecting means provided on the reader support shaft and rotating integrally with the reader support shaft; and a limit switch operated by the operation portion when a forward tilt angle of the reader exceeds the allowable tilt angle. It is characterized by having.

Further, the turning means includes a turning brake that suppresses turning of the turning means, and the turning operation suppressing means is configured such that the forward inclination angle detecting means has detected that the forward inclination angle of the reader exceeds the allowable inclination angle. When detected, the braking state of the turning brake is maintained. Further, the upper rotating body, wherein below the front bracket, said reader is provided with the said inclination allowable angle the lower rear surface of the front cut over da when tilted forward beyond a contact to the buffer material, The reader has a basic reader attached to the front bracket and an extension reader detachably connected to an upper portion of the basic reader, and a reader side connection portion of the backstay extends to the basic reader. When the reader is connected, it is connected to an extension reader, and when the extension reader is not connected to the basic reader, it is connected to the upper part of the basic reader.

According to pile driver of the present invention, when a reader is largely tilted forward than the preset inclination allowable angle, since the turning operation suppressing means suppresses the turning operation of the turning means, the operator performs a turning operation However, the upper swing body does not swing, the lower part of the leader can be prevented from colliding with the front end of the lower travel body, and the lower travel body and the leader can be protected. Moreover, even if the upper swing body is not horizontal, the upper swing body can be formed by forming the forward tilt angle detection means by the limit switch that is operated by the rotation of the reader support shaft that supports the reader to be tiltable in the front-rear direction. The forward tilt angle of the reader with respect to can be detected easily and reliably.

  Moreover, the turning operation of the turning means can be easily suppressed by using the turning brake provided in the turning means as the turning action suppressing means. Furthermore, by providing the buffer material, it is possible to prevent the leader and the like from being damaged by absorbing the impact when the lower rear surface of the leader collides with the upper swing body. In particular, when the leader is composed of a basic reader and an extension reader, and the backstay is shared by the short specification with only the basic reader and the long specification with the extension reader connected, the reader is likely to lean forward and lean. It is effective for.

It is a side view of the pile driver of the short specification state which shows one example of the present invention. It is a principal part side view of a pile driver similarly. It is a principal part sectional view of a pile driver similarly. It is an electric circuit diagram which shows an example of a turning action suppression means. It is a side view of a pile driver similarly in a long specification state. It is a top view of a pile driver similarly.

  The pile driving machine 11 shown in this embodiment includes a lower traveling body 12 provided with a crawler 12a, an upper revolving body 14 provided on the lower traveling body 12 through a turning means 13 so as to be able to swivel, and the upper turning body. A front bracket 15 provided at a front portion of the body 14, a reader 16 attached to the front bracket 15 so as to be tiltable, and provided between the reader 16 and the upper swing body 14; 14 is provided with a pair of left and right backstays 17 and 17 that are tiltably supported from the rear part.

  The reader 16 includes a basic reader 16a attached to the front bracket 15 and a plurality of extension leaders 16b that are detachably connected to the basic reader 16a by flange connection using bolts and nuts. A pair of guide pipes 18 are provided on the front side of the basic leader 16a and the extension leader 16b so as to guide a working device (not shown) so that it can be lifted up and down. A pair of guide rails 20 for guiding the sliding holder 19 provided at the tips of the stays 17 and 17 are provided continuously in the vertical direction. In the working state, the top sheave block 21 is attached to the upper end of the reader 16.

  This pile driving machine 11 has a short specification (FIG. 1) that uses only the basic leader 16a mounted on the front bracket 15 and a long specification in which a plurality of extension leaders 16b are connected to the basic leader 16a. It has a structure that makes it unnecessary to attach and detach the backstay 17 when switching to (FIG. 5), and is formed to be a size that can be transported in a short specification state.

  A first support shaft 22 and a second support shaft 23 are provided at an intermediate position in the vertical direction of the basic reader 16a to support the reader 16 so as to be tiltable in any direction of front, rear, left and right with respect to the upper swing body 14. ing. The first support shaft 22 passes through a first support shaft insertion hole 16c formed in the basic reader 16a in the width direction of the upper swing body, and is fixed in a state where both end portions 22a and 22a protrude from both side surfaces of the basic reader 16a. ing. The second support shaft 23 is provided so as to be rotatable through a second support shaft insertion hole 22b in the front-rear direction formed in the center of the first support shaft 22, and a rear end portion of the second support shaft 23 is a basic reader 16a. It is fixed to the rear side member 16d, and the front end portion passes through the front side member 16e of the basic reader 16a and is fixed by the fixing member 24.

  The front bracket 15 includes a first turning arm 25 and a second turning arm 27 detachably connected to the front side of the first turning arm 25 by connecting pins 26 and 26. The first turning arm 25 is provided on a bracket 28 projecting from the upper turning body 14 so as to be turnable in the front-rear direction via a turning pin 29. A front / rear adjustment cylinder 30 is provided between the body 14 and the body 14. A rubber cushioning material 31 is attached to the lower part of the bracket 28 of the upper swing body 14 so that the lower rear surface of the basic leader 16a abuts when the leader 16 is largely tilted forward.

  The second rotating arm 27 is provided with a bearing 32 that rotatably supports the first support shaft 22 at the upper part on the front end side, and the first support shaft 22 that penetrates both bearings 32 is provided with a first support at both ends. A first support shaft retaining member 33 that rotates integrally with the shaft 22 is attached. Further, a fixing pin for fixing the leader 16 in a forward inclined state when the sliding holder 19 is raised along the guide rail 20 is provided on the lower part of the front side of the second rotating arm 27 and the lower part of the basic reader 16a. Are respectively provided with pin holes 27a and 16f.

  The reader 16 supported by the front bracket 15, the first support shaft 22, and the second support shaft 23 in this manner expands and contracts the front / rear adjustment cylinder 30 to move the first rotation arm 25 and the second rotation arm 27. By rotating about the rotation pin 29, the first support shaft 22 is moved in the front-rear direction via the first support shaft 22, and the first support shaft 22 is rotated by expanding and contracting both the pair of back stays 17 and 17 simultaneously. It tilts in the front-rear direction as the center, and is formed to tilt in the left-right direction with the second support shaft 23 as the center of rotation by extending one of the backstays 17 and 17 and shortening the other.

  Further, as a forward tilt angle detecting means for detecting the forward tilt angle of the reader 16, one first support shaft retaining member attached to one end portion of the first support shaft 22 protruding from the bearing 32 of one second rotating arm 27. An operation protrusion (operation part) 33a is provided on the outer periphery of the member 33, and a limit switch 34 that is turned ON / OFF according to the rotation state of the operation protrusion 33a is provided on the outer surface of one second rotation arm 27. .

The limit switch 34 is housed in a dust-proof case 34a and is provided in a state where the operating lever 34b protrudes toward the operating projection 33a of the first support shaft retaining member 33. The positional relationship between the actuating projection 33a and the limit switch 34 is that the forward tilt angle of the reader 16 is a preset forward tilt allowable angle (when the upper swing body is swung, the lower portion of the reader in the forward tilt state is The operating protrusion 33a that rotates with the forward tilting action of the reader 16 when the tilting allowable angle that does not collide with the front end of the lower traveling body is exceeded the operating lever 34b from the horizontal position indicated by the solid line in FIG. The limit switch 34 is set to be turned ON / OFF by moving the tip indicated by the imaginary line to a position facing upward.

  On the other hand, the turning means 13 can adopt a turning means having a structure generally used in this type of pile driver conventionally, for example, an inner ring fixed on the upper part of the lower traveling body 12 and an upper part. A plurality of rolling elements are provided between the outer ring fixed to the lower part of the revolving body 14 to form the upper revolving body 14 so as to be rotatable relative to the lower traveling body 12, and a turning motor provided on the upper revolving body 14 The upper revolving unit 14 can be turned in any direction by engaging the pinion driven by the inner gear with the internal gear formed on the inner circumference of the inner ring and operating the turning operation lever to operate the turning motor. Forming. Further, the turning means 13 is provided with a turning brake for fixing the upper turning body 14 to the lower traveling body 12. The turning brake is always held in a braking state by a spring, for example, and is configured to release the braking state by a cylinder or the like, and the upper turning body 14 is turned by performing the turning operation after performing the brake releasing operation. be able to.

  The turning operation suppressing means for suppressing the turning operation of the turning means 13 can be formed by an electric circuit 35 as shown in FIG. The electric circuit 35 is configured by arranging the limit switch 34 and the turning brake release switch 37 in series with respect to the turning brake releasing means 36. The ON / OFF operation of the limit switch 34 is indicated by a solid line in FIG. It is set to be ON at the indicated horizontal position and OFF at the position indicated by the imaginary line in FIG.

  When the forward tilt angle of the reader 16 is less than the allowable forward tilt angle, for example, when the upper swing body 14 is in a horizontal state and the forward tilt angle of the reader 16 is 7 degrees or less with respect to the vertical line, the limit switch Since the turning brake release switch 37 is turned on, the turning brake releasing means 36 is energized, for example, an electromagnetic valve provided in the hydraulic circuit of the turning brake is operated in the brake releasing direction, and the cylinder is released. Release the turning brake. Thereby, the upper turning body 14 can be turned in any direction by operating the turning operation lever.

  When the backstays 17 and 17 are greatly extended so that the forward tilt angle of the leader 16 exceeds the forward tilt allowable angle of 7 degrees, the first support shaft retaining member 33 rotates as the first support shaft 22 rotates. The operating projection 33a pushes up the operating lever 34b of the limit switch 34 to the position indicated by the imaginary line in FIG. 2, and the limit switch 34 is turned OFF. As a result, as shown in FIG. 4, the electric circuit 35 has the limit switch 34 turned off, so that the turning brake release means 36 is not energized even if the turning brake release switch 37 is turned on, and the turning brake is braked. Even if the state is maintained and the operation lever for turning is operated, the upper turning body 14 cannot be turned.

  Therefore, it is possible to prevent the lower rear surface of the basic leader 16a that protrudes rearward when the leader 16 is largely inclined forward from colliding with the front end of the crawler 12a of the lower traveling body 12 due to the turning of the upper rotating body 14. The basic reader 16a and the crawler 12a can be protected. Furthermore, when the limit switch 34 is turned off, an alarm is issued with light or sound, so that it is possible to report that the reader 16 is largely inclined forward beyond the allowable forward inclination angle. Further, by providing the cushioning material 31 below the front end portion of the upper swing body 14, when the back stays 17 and 17 are extended and the leader 16 is largely tilted forward, the lower rear surface of the basic leader 16a is placed on the upper swing body 14. Since the impact at the time of colliding below the front end portion can be reduced, the basic leader 16a and the upper swing body 14 can be protected.

  In particular, as shown in this embodiment, a guide rail 20 for guiding the sliding holder 19 provided at the tip of the backstay 17 is provided on the rear surface of the basic leader 16a and the extension leader 16b, and the extension leader 16b is connected. In the case of the pile driver 11 in which the height of the leader 16 can be changed without replacing the back stay 17 by moving the sliding holder 19 along the guide rail 20 according to the state, only the basic leader 16a or When performing pile driving work with a short specification in which one extension leader 16b is connected to the basic leader 16a, the backstay 17 is in a shorter state than in the maximum working state shown in FIG. Because there is room on the extension side, the leader 16 tilts forward and tilts forward more than expected when the backstay 17 is extended. It may exceed the capacity angle.

  Further, since the front / rear position of the leader 16 can be adjusted, even when the positional relationship between the basic leader 16a and the crawler 12a differs depending on the front / rear position of the leader 16, the forward tilt angle detecting means and the turning operation suppressing means can Since it is possible to reliably determine whether or not the upper swing body 14 can be swung while being tilted forward, the swing operation of the upper swing body 14 can be performed safely by raising the reader 16 in the vertical direction as necessary. And the burden on the operator can be reduced.

  Moreover, since it can be implemented with slight modifications such as changing the shape of the first support shaft retaining member 33, adding the limit switch 34, and changing the electric circuit 35, it is possible to suppress an increase in production cost and to modify an existing pile driver. In addition, the forward tilt angle of the reader 16 with respect to the upper swing body 14 can be reliably detected. Furthermore, by providing the cushioning material 31, even when the leader 16 is tilted forward beyond the allowable forward tilt angle, it is possible to avoid the basic leader 16a from violently colliding with the upper swing body 14 and being damaged.

  The configuration of the pile driver is arbitrary and can be applied to pile drivers of various shapes (including ground improvement machines), and the forward tilt angle detecting means and the turning operation suppressing means are not limited to the above-described embodiments. Absent. For example, the forward tilt angle detection means can use an angle sensor that detects an angle with respect to the vertical line with reference to gravity, a rotation angle sensor that detects the amount of rotation of the first support shaft, a rotary encoder, etc. The means is configured to fix the turning operation lever so that it cannot be operated, or to provide an appropriate solenoid valve in a hydraulic circuit that is operated by the turning operation lever or the turning brake releasing means to provide hydraulic pressure to the turning motor or the turning brake release cylinder. The supply may be disabled, or another brake may be provided to restrict the turning of the upper turning body.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Lower traveling body, 12a ... Crawler, 13 ... Turning means, 14 ... Upper turning body, 15 ... Front bracket, 16 ... Leader, 16a ... Basic leader, 16b ... Extension leader, 16c ... First Support shaft insertion hole, 16d ... rear side member, 16e ... front side member, 16f ... pin hole, 17 ... back stay, 18 ... guide gib, 19 ... sliding holder, 20 ... guide rail, 21 ... top sheave, 22 ... first DESCRIPTION OF SYMBOLS 1 spindle, 22a ... end part, 22b ... 2nd spindle insertion hole, 23 ... 2nd spindle, 24 ... fixing member, 25 ... 1st turning arm, 26 ... connecting pin, 27 ... 2nd turning arm , 27a ... pin hole, 28 ... bracket, 29 ... rotating pin, 30 ... front / rear adjustment cylinder, 31 ... cushioning material, 32 ... bearing, 33 ... first support shaft retaining member, 33a ... operating projection, 34 ... limit switch 3 a ... Case, 34b ... actuating lever 35 ... electric circuit, 36 ... releasing means, 37 ... pivot brake release switch

Claims (5)

A lower traveling body, an upper revolving body provided on the lower traveling body via a turning means so as to be able to turn, a reader attached to a front bracket provided at a front portion of the upper revolving body so as to be tiltable, In a pile driving machine comprising a backstay provided between the leader and the upper swing body,
With a forward tilt angle detecting means for detecting the forward tilt angle of the reader,
When the upper swing body is swung, a tilt allowable angle is set in advance so that the lower part of the leader in the forward tilt state does not collide with the front end of the lower traveling body,
A pile driving machine comprising a turning operation suppressing means for suppressing a turning operation of the turning means when a forward inclination angle of the leader detected by the forward inclination angle detecting means exceeds the allowable inclination angle . The reader is pivotally supported on the front bracket with the axis of the reader support shaft fixed to the lower portion of the reader directed in the width direction of the upper swing body, and the forward tilt angle detecting means is connected to the reader support shaft. An actuating portion that is provided and rotates integrally with the reader support shaft, and a limit switch that is actuated by the actuating portion when a forward tilt angle of the reader exceeds the tilt allowable angle. Item 1. A pile driver according to item 1. Said pivoting means comprises suppressing pivoting brake the rotation of the orbiting means, said pivoting actuating restraining means has detected that said the anteversion angle detecting means anteversion angle of the reader exceeds the tilt allowable angle The pile driver according to claim 1 or 2, wherein the brake state of the turning brake is sometimes maintained. The upper rotating body, below the front bracket, wherein the reader is provided with a cushioning material contacts the lower rear surface of the front cut over da when inclined forward beyond the tilt allowable angle The pile driving machine according to any one of claims 1 to 3. The reader includes a basic reader attached to the front bracket and an extension reader that is detachably coupled to an upper portion of the basic reader, and a reader-side connection portion of the backstay extends to the basic reader. 5. The device according to claim 1, wherein when the reader is connected, the reader is connected to an extension reader, and when the reader is not connected to the basic reader, the reader is connected to an upper portion of the basic reader. Pile driver.

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