JP2015113225A - Replacement method for auxiliary hoist rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a replacement method for an earth drill auxiliary hoist rope that facilitates replacement of an earth drill auxiliary hoist rope from a turn to three turns.SOLUTION: In a replacement method for earth drill auxiliary hoist rope from a turn to three turns, where two first and second auxiliary hoist sheaves each wound with an auxiliary hoist rope 34 that suspends an auxiliary hoist hook 35 at the tip of a sheave shaft arranged at the tip of a boom 12 provided on a base machine 11, an auxiliary hoist rope is replaced from a turn to three turns by comprising a leaving rope 37 wound around the second auxiliary hoist sheave to keep both ends fixed on the boom 12 to tilt the boom 12 forward for placement of the auxiliary hoist hook 35 on the ground, by releasing the fixture of the leaving rope 37 to move ends to a vicinity of the ground to make one end of the leaving rope 37 pass through the sheave of the auxiliary hoist hook 35 for coupling with the end of the auxiliary hoist rope 34 via a cable clip, and by pulling the other end of the leaving rope 37.

Description

  The present invention relates to a method for changing a supplementary winding rope of an earth drill, and more particularly, to a method for changing a supplementary rope for changing the number of auxiliary winding ropes for holding a supplementary winding hook of an earth drill from one to multiple.

  A main winding sheave around which a main rope that suspends the Keriba is wound around a sheave shaft provided at the tip of the boom, and an auxiliary winding sheave around which an auxiliary winding rope that suspends an auxiliary winding hook are rotatably mounted. An earth drill is known (see Patent Document 1). The auxiliary winding rope is used to lift various materials used at the time of work with the auxiliary winding hook, but when lifting a relatively heavy thing, multiple ropes such as one to three are used to increase the lifting ability. It can be changed to a hung.

JP 2013-67989 A

  However, in a ground drill using a lattice boom, when the auxiliary winding rope is hung from one to three, even if the boom 12 is tilted forward of the base machine 11, the Keriba rotation drive device 21 is on the lower surface of the boom 12. As a result, the tip of the boom cannot be lowered to near the ground. Therefore, as shown in FIG. 9, a pin on the back surface of the boom 12 is pulled out, and the top end portion of the boom is grounded to the ground surface while the upper portion of the boom is lifted by another crane (not shown).

  In such a state, it is possible to easily change the auxiliary winding rope, but it is necessary to arrange a crane separately, and much time is required for disassembling and assembling the boom. In addition, when the work site is a place such as a confined area, another crane may not be installed in the first place.

  Therefore, the present invention provides a method for changing a supplementary rope that does not require a separate crane and that can easily change the supplementary rope of an earth drill from one to three without disassembling the boom. It is intended to provide.

  In order to achieve the above object, the auxiliary winding rope switching method of the present invention is such that an auxiliary winding rope that suspends an auxiliary winding hook at the tip is wound around a sheave shaft disposed at the tip of a boom provided in the base machine. Two first auxiliary winding sheaves and a second auxiliary winding sheave rotatably attached to the first auxiliary winding sheave are wound around the first auxiliary winding sheave only from the first auxiliary winding sheave. In the auxiliary winding rope changing method for changing to a multiple hook to be hung, a revolving rope is provided which is wound around a second auxiliary winding sheave on which the auxiliary winding rope is not wound and both ends are fixed to the boom, and the boom is a base machine. Tilt forward, place the auxiliary winding hook on the ground, release the fixing of the leaving rope to the boom, move both ends of the leaving rope near the ground, Is passed through the sheave of the auxiliary winding hook, and then one end of the leaving rope is connected to the end of the auxiliary winding rope removed from the tail of the auxiliary winding hook via a cable clip. Pull the other end, pass the auxiliary winding rope through the sheave of the auxiliary winding hook and the second auxiliary winding sheave, then remove the cable clip and connect the end of the auxiliary winding rope to the tail of the auxiliary winding hook By doing so, it is characterized in that the auxiliary winding rope is changed from one hook to multiple hooks.

  According to the auxiliary rope replacement method of the present invention, the leaping rope that has been fixed to the second auxiliary winding sheave in advance can be connected to the auxiliary rope to change from one to three. There is no need to arrange a crane, and there is no need to disassemble the boom, so that work efficiency can be improved.

It is a side view which shows an example of the earth drill to which this invention is applied. It is a top view of a boom tip part similarly. It is explanatory drawing which similarly shows the state in which a rope is hung. It is a side view of an earth drill when the boom is also tilted forward. It is explanatory drawing of the auxiliary winding rope switching method of this invention, and is explanatory drawing which shows the state of a rope when a boom is tilted ahead. It is explanatory drawing of the auxiliary winding rope switching method of this invention, and is explanatory drawing which shows the state which connected the end part of the auxiliary winding rope via the cable clip. It is explanatory drawing of the auxiliary winding rope switching method of this invention, and is explanatory drawing which shows a state when passing an auxiliary winding rope through the 2nd auxiliary winding sheave. It is explanatory drawing of the auxiliary winding rope switching method of this invention, and is an explanatory drawing which shows a state when connecting the end part of an auxiliary winding rope with the tail of an auxiliary winding hook, and making it 3 hooks. It is explanatory drawing of the auxiliary winding rope switching method of the conventional earth drill.

  First, an example of an earth drill to which the present invention is applied will be described with reference to FIGS. 1 to 3. The earth drill 10 is provided with a sheave shaft 13 in a horizontal direction perpendicular to the longitudinal direction of the lattice boom 12 at the tip of a lattice boom 12 provided in a self-propelled base machine 11 so as to be raised and lowered. A main rope 17 fed from a main winding winch 15 through a main winding guide sheave 16 is wound around a main winding sheave 14 rotatably supported by the main winding sheave 14, and a kelly bar is connected to the tip of the main rope 17 through a swivel joint 18. 19 is rotatably suspended, and the kelly bar 19 is moved up and down by the main winding winch 15. A kelly bar rotation drive device 21 through which the kelly bar 19 can be moved up and down is supported by a cylinder 22 at the tip of the arm 20 supported below the lattice boom 12. The rotary drive device 21 is configured to rotate the kelly bar 19. In addition, a rotary table 23 that rotates integrally with the kelly bar 19 but does not move up and down is provided at the lower part of the kelly bar rotation drive device 21, and the kelly bar 19 protrudes downward from the rotary table 23. An expanded bottom bucket 24a and excavation bucket 24b that rotate integrally with 19 and move up and down are mounted.

  A gantry 25 is erected at the rear part of the base machine 11, and a hoisting rope 27 from the hoisting winch 26 is connected to a bracket 29 provided at the upper end of the lattice boom 12 via a pendant rope 28.

  Furthermore, a first auxiliary winding sheave 30 and a second auxiliary winding sheave 31 are rotatably supported on the sheave shaft 13. In the case of a single hook, the auxiliary winding rope 34 fed out from the auxiliary winding winch 32 via the auxiliary winding guide sheave 33 is wound around the first auxiliary winding sheave 30, and the tip of the auxiliary winding rope 34 and the auxiliary winding are wound. The bottom of the hook 35 is connected (state shown in FIG. 1). Further, in the case of three hooks, the auxiliary winding rope 34 wound around the first auxiliary winding sheave is further wound around the sheave 36 of the auxiliary winding hook 35 and the second auxiliary winding sheave. (State of FIG. 3). Usually, the auxiliary winding rope is often used with one hook, but when a lifting capacity is required, such as when relatively heavy objects are lifted, the auxiliary winding rope is replaced with three hooks.

  Next, with reference to FIG. 4 to FIG. 8, a description will be given of the auxiliary winding rope changing method of the present invention for changing from one hook to three hooks.

  First, as shown in FIG. 5, when a normal single hook is used, as shown in FIG. 5, a leaving rope 37 is previously attached to the second auxiliary winding sheave 31 on which the auxiliary winding rope 34 is not wound. It winds and the both ends are fixed to the lattice boom 12. Here, the reeving rope 37 is a rope that is thinner than the auxiliary winding rope 34 so that it can be easily handled, and a ring 38 that is gripped by a hand or the like is provided on one end side. The fixing to the lattice boom 12 is performed by any means.

  When changing from one to three hooks, first, as shown in FIGS. 4 and 5, the kelly bar 19 is removed, and the lattice boom 12 is tilted forward until the kelly bar rotary drive device 21 contacts the ground, and the amount of the rope fed out Is adjusted to lower the auxiliary winding hook 35 to the ground. However, since there is the Keriba rotation drive device 21, the tip of the lattice boom 12 cannot be lowered to the ground.

  In this state, both ends of the leaving rope 37 fixed to the lattice boom 12 are released using the scaffold 39 of the bottom expansion bucket 24a, and both ends of the leaving rope 37 are lowered to near the ground.

  Next, as shown in FIG. 6, the lower end portion of the reeving rope 37 without the ring 38 is passed through the sheave 36 of the auxiliary winding hook 35, and the end portion is supplemented through the cable clip 40. It connects with the edge part of the supplementary winding rope 34 removed from the tail of the winding hook 35.

  When the ring 38 of the leaving rope 37 is pulled from this state, the auxiliary winding rope 34 is pulled by the cable clip 40 and wound around the sheave 36 and the second auxiliary winding sheave 31 of the auxiliary winding hook 35, as shown in FIG. It becomes a state. Finally, as shown in FIG. 8, the cable clip 40 is removed, and the end of the auxiliary winding rope 34 is connected to the tail of the auxiliary winding hook 35 so that a three-hook state is obtained.

  If it is the above-mentioned method, since it is not necessary to prepare another crane and it is not necessary to disassemble a boom, work efficiency is good. Further, since the scaffold 39 of the bottom expansion bucket 24a is always in the field during the work of the earth drill, there is no equipment to be added to the changing work. Furthermore, since the work performed using the scaffold 39 is only to release the fixing of the leaving rope 37, the safety of the work at a high place is high.

DESCRIPTION OF SYMBOLS 10 ... Earth drill, 11 ... Base machine, 12 ... Lattice boom, 13 ... Sheave shaft, 14 ... Main winding sheave, 15 ... Main winding winch, 16 ... Main winding guide sheave, 17 ... Main rope, 18 ... Swivel joint, 19 ... Keriba, 20 ... arm, 21 ... Keriba rotary drive, 22 ... cylinder, 23 ... rotary table, 24a ... bottom bucket, 24b ... excavation bucket, 25 ... gantry, 26 ... undulation winch, 27 ... undulation rope, 28 ... pendant rope 29 ... Bracket, 30 ... First auxiliary winding sheave, 31 ... Second auxiliary winding sheave, 32 ... Supplementary winding winch, 33 ... Supplementary winding guide sheave, 34 ... Supplementary winding rope, 35 ... Supplementary winding hook, 36 ... Sheave, 37 ... Leaving rope, 38 ... ring, 39 ... scaffold, 40 ... cable clip

Claims (1)

Two first auxiliary winding sheaves and second auxiliary winding sheaves that can be rotated around a sheave shaft that is arranged at the tip of the boom provided in the base machine. In the method of changing the auxiliary rope, the auxiliary hook of the earth drill attached to the hook is wound only around the first auxiliary winding sheave and is changed from the multiple hooks around the first and second auxiliary winding sheaves.
A revolving rope that is wound around a second auxiliary winding sheave that is not wound with an auxiliary winding rope and that has both ends fixed to the boom;
Tilt the boom forward of the base machine, place the auxiliary winding hook on the ground,
Release the fixing of the reeve rope to the boom, move both ends of the reeve rope to near the ground, pass one end of the reeve rope through the sheave of the auxiliary winding hook,
One end of the reeving rope is connected to the end of the auxiliary winding rope removed from the tail of the auxiliary winding hook via a cable clip,
After pulling the other end of the reeving rope and passing the auxiliary winding rope through the sheave of the auxiliary winding hook and the second auxiliary winding sheave,
By removing the cable clip and connecting the end of the auxiliary winding rope to the tail of the auxiliary winding hook,
A method for changing the auxiliary winding rope, characterized in that the auxiliary winding rope is changed from one to multiple.

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