JP6351477B2 - Attaching and removing the lower reader - Google Patents

Description

  The present invention relates to a method for attaching and detaching a lower leader, and more particularly, to a method for attaching and detaching a lower leader detachably provided at a lower end of a leader of a pile driver.

  As a dual-purpose machine that can perform steel pipe pile embedding work and ground improvement work with a single pile driver, a lower leader is detachably attached to the lower end of the leader. In steel pipe pile embedding work, the work moves up and down along the leader. Work with the lower leader attached to increase the stroke of the equipment, and in ground improvement work, work with the lower leader removed to increase the diameter of the excavation head provided at the lower end of the rod Is known. However, in order to attach and detach the lower leader, it is necessary to attach and detach the bolt that connects the lower leader and the upper reader with a flange while the lower leader is suspended by a crane. It may take a long time. In addition, when transporting a dual-purpose machine, the work device is held in the lower leader part and the upper leader is tilted backwards. It becomes necessary to attach and detach the lower leader. For this reason, it is a dual-purpose machine that raises and lowers the work device with the rack and pinion method, and by increasing and decreasing the stroke of the work device during the steel pipe pile embedding work by attaching and detaching the rack provided in front of the lower leader, the ground improvement work There has been proposed one in which the diameter of the excavation head at the time of performing is increased (see, for example, Patent Document 1).

JP 2006-291634 A

  However, although the diameter of the excavation head can be increased to some extent by attaching and detaching the rack in front of the lower leader, it has been necessary to use an excavation head having a smaller diameter than that for attaching and detaching the lower leader.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a method for attaching / detaching a lower leader, which can easily and safely attach / detach the lower leader.

  In order to achieve the above object, the method of attaching and detaching the lower leader of the present invention is a method of attaching and detaching a lower leader that is detachably attached to the upper leader by flange connection to the lower end of the leader of the pile driver. When removing the lower reader from the reader, the hinge pieces of the hinges with the hinge axis in the horizontal direction are fixed to the front surface of the lower end of the upper reader and the upper surface of the lower reader, respectively. A hinge mounting step for connecting the upper leader and the lower leader in a state where the leader is tilted rearward, and a coupling release step for releasing the flange coupling by removing the bolts connecting the upper leader and the lower leader to the flange; In the state of being lifted by a lifting tool, the hinge is removed and a reader separation process for separating the upper reader and the lower reader is sequentially performed. When the lower reader is attached to the upper reader, the hinge piece of the hinge is fixed to the front surface of the lower end of the upper reader and the upper surface of the upper end of the lower reader while the lower reader is lifted by a lifting tool. A hinge connection step for connecting the reader with a hinge, and a flange contact for releasing the lifted state of the lower reader by the lifting tool and tilting the reader backward to contact the flange of the upper reader and the flange of the lower reader A step of attaching a bolt for flange-connecting the upper reader and the lower reader to flange-connect the upper reader and the lower reader, and a hinge removing step of removing the hinge from the upper reader and the lower reader It is characterized by that.

  Furthermore, in the method for attaching and detaching the lower leader according to the present invention, the hinge is a hinge capable of separating both hinge pieces by extracting a hinge shaft, and in the leader separating step, instead of removing the hinge, By pulling out the hinge shaft, the upper side reader and the lower reader are separated in a state where each hinge piece is fixed to the upper side reader and the lower side reader. In the hinge connecting step, the hinge piece is connected to the front surface of the lower end of the upper side reader. Instead of being fixed to the front surface of the upper end of the lower reader, the hinge pieces are inserted into both hinge pieces fixed in advance to the upper reader and the lower reader in advance to connect the hinge pieces.

  In the coupling release step, when all the bolts are removed, the readers are tilted to an angle at which both leaders are connected by the hinges and both flanges are kept in contact with each other. The lower leader in the hinge connecting step is characterized in that the axis of the lower leader is lifted in the horizontal direction.

  Furthermore, the method for attaching and detaching the lower leader of the present invention is the method of attaching and detaching the lower leader that is detachably attached to the upper leader by flange connection to the lower end of the leader of the pile driver. A hinge piece member that is rotatably connected to the upper end of the lower reader by a detachable connecting pin is provided in advance, and when the lower reader is removed from the upper reader, the reader is inclined backward. A coupling release step for releasing the flange coupling by removing the bolts that flange-couple the upper leader and the lower leader, and a connecting pin for coupling the hinge piece member in a state where the lower leader is lifted by a lifting tool. Remove the upper reader and the lower reader sequentially and perform the reader separation step in order, and attach the lower reader to the upper reader A hinge connecting step of attaching a connecting pin to the hinge piece member in a state where the lower leader is lifted by a lifting tool, and connecting the upper reader and the lower reader by both hinge piece members and the connecting pin; A flange abutting step for releasing the lifting state of the lower reader, tilting the reader rearward, and abutting the flange of the upper reader and the flange of the lower reader, and a bolt for flange connection of the upper reader and the lower reader And a joining step of flange-joining the upper side reader and the lower leader is performed sequentially.

  According to the method for attaching and detaching the lower leader of the present invention, even if all the bolts connecting the upper side reader and the lower leader to the flange are removed, the lower leader supported by the hinge does not fall, and a crane or the like is suspended. The lower reader can be separated from the upper reader by removing the hinge while the lower reader is lifted by the tool, and the lower reader can be attached to the upper reader in the reverse procedure. Therefore, the lower leader can be attached and detached safely and easily, and the working time can be greatly shortened.

It is a side view which shows one example of a hinge attachment process in the attachment or detachment method of the lower leader of this invention. It is also a front view. It is a side view which shows one example of a coupling | bonding cancellation | release process. It is a side view which shows one example of a reader separation process. It is a side view which shows an example of a pile driver. It is a principal part side view which shows the other example of a hinge in the attachment or detachment method of the lower leader of this invention. It is a principal part front view similarly. It is a principal part side view which similarly shows the state which bent the leader.

  As shown in FIG. 5, the pile driving machine that is the object of the present invention includes a lower traveling body 11, an upper revolving body 12 that is turnably provided on the lower traveling body 11, and an upper revolving body 12. A leader 13 provided in a front bracket 12 a provided at the front portion so as to be raised and lowered, and a backstay 14 for supporting the leader 13 from the rear portion of the upper swing body 12 are provided. A working device 15 such as an auger is provided at the front portion of the reader 13 so as to be able to move up and down along the reader 13. A rack and pinion type lifting device for raising and lowering the working device 15 is provided at the front center of the reader 13. The rack 16 is continuously provided over the entire length, and guide rails (guide pipes) 17 for guiding the working device 15 are provided continuously over the entire length at the front end portions on both sides of the leader 13.

  The leader 13 is formed by connecting a plurality of leader members. The leader 13 is detachably attached to the lower end of the upper leader 21 attached to the front bracket 12a so as to be raised and lowered by a flange connection. A lower reader 22 is provided. The upper reader 21 and the lower reader 22 are connected by fastening a flange 21 a provided at the lower end of the upper reader 21 and a flange 22 a provided at the upper end of the lower reader 22 with a bolt 23. .

  This lower leader 22 is attached to the lower end of the upper side leader 21 when performing the steel pipe pile burying work, thereby increasing the leader length and increasing the stroke of the working device 15, and when performing the ground improvement work. By removing from the lower end of the upper reader 21, the excavation head 18 having a large diameter can be used.

  Next, a procedure for removing the lower reader 22 from the upper reader 21 will be described with reference to FIGS. First, as shown in FIGS. 1 and 2, the hinge pieces 24b and 24c of the hinge 24 with the hinge shaft 24a oriented in the horizontal direction are attached to the front surface of the lower end portion of the upper reader 21 and the front surface of the upper end portion of the lower reader 22. A hinge mounting step is performed in which the upper leader 21 and the lower leader 22 are connected to each other by a bolt 25 so as to be bent. The hinge 24 used here is formed so that the hinge shaft 24a can be attached and detached, from a small diameter portion 24d inserted into the shaft holes of the hinge pieces 24b and 24c, and one end of the shaft holes of the hinge pieces 24b and 24c. And a large-diameter portion 24e protruding outward.

  Positions in which a plurality of attachment holes 27 for fixing hinge pieces 24b and 24c and attaching a suspension 26 described later are set in advance on the front surface of the lower reader 22 and the lower surface of the upper reader 21. Are provided respectively. In addition, things that interfere with each step of removing the lower leader 22 such as attachment of the hinge 24, for example, the rack 16 located at the front of the lower leader 22 and the lower end of the front of the upper reader 21, are removed in advance.

  After performing the hinge attaching step, as shown in FIG. 3, the backstay 14 is slightly shortened, the upper portion of the reader 13 is tilted backward, and the leader 13 is inclined backward by a predetermined angle to perform the coupling releasing step. Do. At this time, the inclination angle of the leader 13 is such that the center of gravity of the lower leader 22 is located in front of the vertical line of the hinge shaft 24a and is connected by the hinge 24 when all the bolts 23 are removed from the flanges 21a and 22a. The minimum inclination angle at which the upper reader 21 and the lower reader 22 can maintain the contact state of both flanges 21a, 22a is set.

  As a result, when removing the bolt 23, the bolt 23 and the shaft of the nut can be kept in alignment, and the bolt 23 can be removed at a low position, so that it can be performed safely and easily. At this time, if the inclination angle of the leader 13 is increased more than necessary, the position of the bolt 23 becomes high, and the removal work of the bolt 23 becomes troublesome. If the leader 13 is brought down to nearly 90 degrees, the removal work of the bolt 23 is high. Work may occur.

  Further, a lifting tool 26 such as an eyebolt is attached to the mounting hole 27 provided on the front surface of the lower leader 22, and a crane wire 28 is connected to prepare for lifting the lower leader 22.

  After performing the coupling release process, as shown in FIG. 4, the reader separation process is performed to separate the lower reader 22 from the upper reader 21. In this leader separation step, the lower leader 22 is lifted by a crane, rotated in a substantially horizontal direction around the hinge 24, and the lower leader is suspended in a stable state by the wire 28 of the crane. The small diameter portion 24d is extracted from the shaft holes of the hinge pieces 24b and 24c so that the hinge pieces 24b and 24c can be separated. Thereby, the upper side reader | leader 21 and the lower reader | leader 22 can be isolate | separated, without removing the hinge pieces 24b and 24c. The separated lower leader 22 is moved to a position where it does not interfere with the ground improvement work by operating the crane.

  When the separated lower reader 22 is attached to the lower end of the upper reader after the work is completed, the above procedure may be reversed. That is, with the lower leader 22 being lifted by a crane, the small-diameter portion 24d of the hinge shaft 24a is inserted into the shaft holes of the hinge pieces 24b and 24c, and the hinge pieces 24b and 24c are connected to each other. Hinge connection step (FIG. 4), and the lower leader 22 lifted by the crane is released, and the flange 21a of the upper reader 21 and the flange 22a of the lower reader 22 are inclined rearward. A flange contact step for bringing the upper reader 21 and the lower reader 22 into a flange connection by attaching a bolt 23 for flange connection (FIG. 3), a hinge 24 from the upper reader 21 and the lower reader 22 And the hinge removal process (FIGS. 1 and 2) for removing the hanger 26 in order and before the reader separation. Disconnect was rack etc. may be attached.

  In this way, the upper reader 21 and the lower reader 22 are connected by the hinge 24, and the bolts 23 are attached to and detached from the flanges 21a and 22a in a state where the reader 13 is inclined backward by a predetermined angle. With the lower reader 22 stabilized, the bolt 23 can be safely attached and detached at a low position. In addition, although the inclination angle to the rear of the reader 13 depends on the model, it may be about 10 to 20 degrees, so that the work space can be reduced.

  The hinge piece 24b fixed to the upper reader 21 may remain fixed or may be removed if there is no problem in the work. Further, the hinge piece 24c fixed to the lower leader 22 remains fixed and there is no problem.

  6 to 8 show other forms of hinges used in the method for attaching and detaching the lower leader according to the present invention. In the following description, the same reference numerals are given to the same constituent elements as the constituent elements such as the reader shown in the embodiment, and the detailed description is omitted.

  In the hinge 31 shown in this embodiment, a spacer 32 is provided on the back surface of the hinge pieces 31a and 31b, and the hinge 31 is connected to the upper reader 21 with the spacer 32 interposed between the hinge pieces 31a and 31b and the reader front surface. The hinge shaft 31c of the hinge 31 is arranged in front of the front surface of the rack 16 by being attached to the front surface of the lower end portion of the lower leader 22 and the front surface of the upper end portion of the lower reader 22 with mounting bolts 25, respectively.

  Thus, by arranging the hinge shaft 31c in front of the front surface of the rack 16, as shown in FIG. 8, the hinge attaching step and the leader separating step can be performed without removing the rack 16, and the lower leader 22 Can be rotated in a substantially horizontal direction by a crane. Thereby, when the lower leader 22 is attached / detached, the attachment / detachment of the rack 16 becomes unnecessary, and the workability can be improved.

  The above embodiment uses a hinge that allows the hinge shaft to be attached and detached so that the hinge piece can be easily separated. However, when using a hinge with a fixed hinge shaft, One hinge piece, usually the hinge piece may be removed from the upper reader, and the removed hinge piece may be attached to the upper leader in the hinge connecting step. Further, the shaft hole of the upper hinge piece may be U-shaped with the upper opening, and the hinge shaft fixed to the lower hinge piece may be extracted upward. Further, hinge piece members corresponding to the hinge pieces of the hinge may be attached in advance to the upper reader and the lower reader.

DESCRIPTION OF SYMBOLS 11 ... Lower traveling body, 12 ... Upper turning body, 12a ... Front bracket, 13 ... Leader, 14 ... Back stay, 15 ... Working device, 16 ... Rack, 17 ... Guide rail, 18 ... Excavation head, 21 ... Upper side leader 21a ... flange, 22 ... lower leader, 22a ... flange, 23 ... bolt, 24 ... hinge, 24a ... hinge shaft, 24b, 24c ... hinge piece, 24d ... small diameter part, 24e ... large diameter part, 25 ... mounting bolt, 26 ... Suspension tool, 27 ... Mounting hole, 28 ... Wire, 31 ... Hinge, 31a, 31b ... Hinge piece, 31c ... Hinge shaft, 32 ... Spacer

Claims (5)

  In the method of attaching / detaching the lower leader attached to the upper side reader by flange connection to the lower end of the leader of the pile driver, when removing the lower leader from the upper side reader, A hinge attachment step of fixing the hinge pieces of the hinges with the hinge axis horizontally oriented to the front surface of the upper end of the lower reader to connect the upper reader and the lower reader so that they can be bent, and tilting the reader backward A coupling release step of releasing the flange coupling by removing the bolt that couples the upper reader and the lower reader in a state where the upper reader and the lower reader are connected, and removing the hinge while the lower reader is lifted by a lifting device, When the reader separation process for separating the lower reader is performed sequentially, and the lower reader is attached to the upper reader, the lower reader is A hinge connecting step of fixing the hinge piece of the hinge to the front surface of the lower end of the upper reader and the front surface of the upper end of the lower reader in a raised state, and connecting the upper reader and the lower reader with a hinge; The lower leader is lifted by the flange, the flange is brought into contact with the flange of the upper reader and the lower reader by tilting the reader backward, and the upper reader and the lower reader are flange-coupled. A method of attaching and detaching a lower leader, comprising: sequentially performing a joining step of attaching a bolt to a flange of the upper leader and the lower leader, and a hinge removing step of removing a hinge from the upper leader and the lower leader.   The hinge is a hinge capable of separating both hinge pieces by extracting the hinge shaft. In the leader separating step, each hinge piece is moved upward by removing the hinge shaft instead of removing the hinge. The upper reader and the lower reader are separated from each other while being fixed to the side reader and the lower reader, and in the hinge connecting step, the hinge piece is fixed to the front surface of the lower end of the upper reader and the front surface of the upper end of the lower reader. 2. A method for attaching and detaching a lower leader according to claim 1, wherein the hinge pieces are inserted into both hinge pieces fixed to the upper reader and the lower leader in advance, and the hinge pieces are connected.   3. The uncoupling step, wherein when all bolts are removed, the leaders are tilted to an angle at which both leaders are connected by the hinges and both flanges are kept in contact with each other. How to attach and detach the lower reader.   4. The lower leader according to claim 1, wherein the lower leader in the leader separating step and the hinge connecting step is in a state where the axis of the lower leader is lifted in the horizontal direction. 5. Detachment method.   In the method of attaching and detaching the lower leader, which is detachably attached to the upper leader by flange connection, to the lower end of the leader of the pile driver, the detachable connection between the lower end of the upper leader and the upper end of the lower leader Provided in advance with hinge piece members that are pivotally connected by pins, and when removing the lower reader from the upper reader, flange the upper reader and lower reader with the reader tilted backward. A coupling releasing step of removing the bolts to release the flange coupling, and removing the connecting pin connecting the hinge piece member in a state where the lower leader is lifted by a lifting tool to separate the upper reader and the lower reader When the reader separation process is performed sequentially and the lower reader is attached to the upper reader, the lower reader is lifted by a lifting tool. In the state, a connecting pin is attached to the hinge piece member to connect the upper reader and the lower reader with the hinge piece member and the connecting pin, and the lifting state of the lower reader by the lifting tool is released, and the reader is A flange contact process in which the flange of the upper reader and the flange of the lower reader are contacted by inclining backward, and a bolt for flange-connecting the upper reader and the lower reader is attached, and the upper reader and the lower reader are flanged A method for attaching and detaching a lower leader, comprising sequentially performing a coupling step of coupling.

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