JP2020111432A - Crane and wiring method - Google Patents

Abstract

To provide a crane capable of hoisting/lowering a heavier suspended cargo safely by increasing the number of suspended wire ropes while maintaining a basic concept that is an automatic switching structure of wire ropes.SOLUTION: A crane includes a hook block and a coupling body. A lower part of the coupling body is continuously provided with n pieces of intermediate pulleys (the n is an integer of 2 or more) in an axial direction of a pulley. A pair of upper pulleys are provided in a horizontal direction on both sides of an upper part in the hook block while interposing a notched groove therebetween. The n-1 pieces of lower pulleys are provided in a vertical direction of the intermediate pulleys approximately at a center part in the hook block. When a wire rope is lowered after the wire rope is hoisted and the coupling body is connected to a coupling part, a wire rope is wound around the intermediate pulleys so as to be brought into a state of being suspended by 2×(n+1) number of wire ropes. When the wire rope is hoisted and the coupling is released while the coupling body is housed in the notched groove and the wire rope is stored in grooves of the intermediate pulleys, the coupling body and the hook block are integrally lowered to be switched to a state of being suspended by two wire ropes.SELECTED DRAWING: Figure 1

Description

The present invention relates to a crane that is used for construction work and that switches the number of wire ropes that are hoisted and unwound according to the weight of a suspended load, and a wiring method thereof.

A crane, which is installed at a construction site and used for hoisting and unwinding suspended loads, has a predetermined number of wire ropes attached to it. For example, two suspended ropes (hook blocks) are attached by the wire ropes. Winding and unwinding while suspended.
When the weight of the suspended load is heavy, the jib is lowered and the wire ropes are manually relocated from the two-hanging posture to the four-hanging posture near the ground over half a day.

In order to improve the inefficiency of workability due to this manual work, the present applicant discloses, as disclosed in Patent Document 1, a hanging body supported by a jib and a hook block in which a hanging hook is fixed to a lower portion. And a pulley that can be inserted into and removed from the hook block and that can be connected to the hanging body. A pulley is provided in the lower portion of the connection body, and a pair of pulleys is horizontally provided inside the hook block. , After the hook block is rolled up and the connecting body is connected to the hanging body, when the hook block is lowered, the wire rope is automatically switched from the two-hanging posture to the four-hanging posture, while the connecting body is hung. (EN) Provided is a compound pulley mechanism of a crane in which a wire rope is automatically switched from a four-hanging posture to a two-hanging posture when released from a body and stored in a hook block.

JP, 2013-75406, A

However, when the crane is installed at a construction site such as wind power generation and dam applications, the weight of the crane changes from 30 to 150 tons compared to the weight of the suspended load of a conventional building or the like, which makes the crane very heavy. Therefore, in the four-hanging posture of Patent Document 1, the wire rope becomes thick, which increases the size of the structure such as the speed reducer and the sheave, and also increases the weight. Further, since the crane itself becomes large, the conventional manual change of the wire rope is very time-consuming, inefficient and dangerous.

The present invention has been made in view of the above circumstances, and its main purpose is to further increase the weight by increasing the number of hanging wire ropes while maintaining the basic concept of the automatic wire rope switching structure. An object of the present invention is to provide a crane that can be safely hoisted and unwound even with a suspended load.

According to the present invention, one is supported by the jib top of the crane, the other is a hanging body provided with a connecting portion, a hanging hook is attached to the lower part, and a hook block provided with a notched groove of an upward opening in the upper part, The hook block includes a connecting body that can be inserted into and removed from the cutout groove and that can be connected to the connecting portion. The crane is a crane in which a plurality of intermediate pulleys (n is an integer of 2 or more) are connected in the axial direction of the pulley in the lower part, and a pair of upper pulleys are notched in the upper part of the hook block. It is provided on both sides in the horizontal direction across the groove, and n-1 lower pulleys are provided in the vertical direction of the intermediate pulley at approximately the center of the hook block, and the wire rope is wound to connect the connecting body to the connecting portion. After that, when the wire rope is unwound, the wire rope is hung on the intermediate pulley to be in a 2×(n+1) suspension state, and the wire rope is wound up, the connecting body is stored in the notch groove, and the wire rope is There is provided a crane having a structure in which when the connection is released in a state where the connection body and the hook block are accommodated in the groove, the connection body and the hook block are integrally wound and switched to the two-hanging state.

With the crane according to the present invention, it is possible to hoist/unwind even a heavy suspended load by 2×(n+1) hooks. Moreover, since the wire rope is always accommodated in the groove of the intermediate pulley, automatic switching can be safely and reliably performed.

Preferably, in the crane, a pair of upper sheaves is provided with a distance of at least approximately one sheave provided.

Preferably, in the crane, there is provided a crane in which one of the pair of upper sheaves is arranged with a distance such that one of the upper sheaves does not overlap the other in the axial direction.

Preferably, in the crane, the lower sheave is provided at a center position between n intermediate sheaves.

Preferably, in the crane, the wire rope wound around one of the top pulleys is passed through one of the upper pulleys, is wound on an intermediate pulley on one side in the axial direction of the pulley, and is wound on a lower pulley. A crane is provided which is wrapped around an intermediate pulley on the other side, passed through an upper pulley on the other side, and is wrapped around a top pulley on the other side.

According to another aspect of the present invention, one is supported by a jib top of a crane, the other has a hanging body provided with a connecting portion, a hanging hook is attached to a lower portion, and a notched groove having an upward opening is provided at an upper portion. The hook block includes a hook block and a connecting body that can be inserted into and removed from the notch groove and can be connected to the connecting portion.The hook block is wound by a wire rope wound around two top pulleys attached to the jib top. Unwinding is performed, and the connecting body has n (n is an integer of 2 or more) intermediate pulleys connected in the axial direction of the pulley at the bottom, and a pair of upper pulleys are notched at the upper part in the hook block. Provided on both sides in the horizontal direction across the groove, n-1 lower pulleys are provided in the vertical direction of the intermediate pulley at approximately the center of the hook block, and the wire rope is hung from one of the top pulleys. A wiring method that allows a hook block to be wound and unwound by passing a wire rope around a pair of upper sheaves and to the other top pulley, and a process of passing through a pair of upper sheaves. In step a, a wire lobe is hung from one upper pulley to one axial side of the intermediate pulleys among the n intermediate pulleys, and after the step a, n-1 lower pulleys or n- Step b in which one lower pulley is wound around one side in the axial direction of the lower pulley, and after step b, the other side of the intermediate pulley, or the second count from one axial side of the intermediate pulley toward the other side. And a step c that is wound around the intermediate pulley of step a), and after performing the procedure of steps a to c at least once, passing through the other upper pulley, a wiring method is provided.

According to the present invention, while maintaining the basic concept of the automatic wire rope switching structure, by providing an increased number of wire ropes, it is possible to provide a crane capable of hoisting and unwinding a heavier load. be able to.
Further, since the wire rope is always housed in the groove of the intermediate pulley, it is possible to safely and reliably switch the wire rope without making a mistake in catching the wire rope at the time of switching.

The figure which showed the two hanging state of a crane. 2A is a side view of FIG. 1, FIG. 2B is a plan view seen from the arrow Y of FIG. 1, and FIG. 2C is a plan view seen from the arrow Z of FIG. The figure which showed the connection state of the connection body at the time of winding up the wire rope of FIG. The figure which showed the 6-hanging state of the crane. 5A is a front view and FIG. 5B is a side view. FIG. 6A is a front view and FIG. 6B is a side view of the hook block. FIG. 7A is a front view and FIG. 7B is a side view of the hanging body.

A preferred embodiment of the crane will be specifically described with reference to the drawings. For the sake of convenience, the crane will be described below as an example in which the crane is incorporated into a jib crane, but the crane can be suitably incorporated into other cranes (overhead crane, bridge crane, derrick, etc.). Further, the present invention is not limited to the following embodiments, and appropriate modifications can be made without departing from the scope of the effects of the present invention.

1. Schematic Configuration of Crane Section 1 describes the schematic configuration of the crane 10. FIG. 1 schematically shows a state in which two cranes 10 are suspended. 2A is a side view of the hook block of FIG. 1 from which the wire rope of the connecting body is removed, FIG. 2B is a plan view seen from the arrow Y of FIG. 1, and FIG. 3A and 3B respectively show plan views viewed from the arrow Z of FIG.
The crane 10 hoists or unwinds the hook block 30 by "winding" or "unwinding" the wire rope 11 attached to a hoisting machine (not shown) mounted on the turning table of the crane body. It is made up of.

As shown in FIG. 1, the wire rope 11 fed from the hoisting machine is hung on one of the top pulleys 13 of the pair of top pulleys 13 rotatably provided on the jib top 12 and then hung down. , Is turned up via the hook block 20, is wound around the other top pulley 13, and is fixed to the crane body (not shown).

That is, when the hoisting machine is driven while the hoisting machine is not driven, the wire rope 11 is “rewound” or “unrolled”, and thus the hook block 20 is vertically raised (hoisted) or lowered (hoisted). It is configured to do).

Further, a hanging body 30 is supported on the jib top 12 of the crane 10 at a substantially central position between the pair of top pulleys 13, and the hanging body 30 is removably stored in an upper portion of the hook block 20. By connecting the connecting bodies 40, the number of hanging hook blocks 20 can be automatically changed.

2. Configuration of Hanging Body 30 In the second section, the hanging body 30 for hanging the connecting body 40 will be described.
7A and 7B show a hanging body 30, in which FIG. 7A is a front view and FIG. 7B is a side view. As shown in FIG. 7, the hanging body 30 includes a pair of plates 31 and joining pins 32 (an example of joining means), and each plate 31 is joined to a supporting hole 33 supported by a jib top at an upper portion and a lower portion. Joint holes 34 to which the pins 32 are joined are provided respectively.

Thereby, each plate 31 is supported at a substantially central position between the pair of top pulleys 13 of the jib top 12 with a gap s into which the coupling body 40 can be inserted and removed, and the coupling body 40 is inserted into the gap s. It is configured such that the hanging body 30 and the connecting body 40 are joined by joining them later with the joining pin 32.

In addition, at this time, in a front view, the lower portion of each plate 31 is formed in a tapered shape with an upper recess on the center line of the hanging body 30. Accordingly, when the connecting body 40 is inserted into the hanging body 30, it is guided by the tapered portion and is housed in the gap s, so that the connecting body 40 can be reliably joined to the hanging body 30.

Although the joining pin 32 is provided as the joining means in the present embodiment, the joining means is not limited to the joining pin 32, and may be fixed by a bolt or other means.
Further, the joining of the connecting body and the joining pin 32 may be performed manually or automatically as described below. For example, a push-out means such as a cylinder is provided on the opposite side of the joining pin 32 in the traveling direction, and the cylinder is operated based on a signal detected by a detection means (such as a limit switch) when the connecting body 40 is inserted into the hanging body 30. Therefore, the joining may be automatically performed by remote control.

3. Configuration of Connection Body 40 Section 3 describes the connection body 40 that is hung on the hanging body 30 or stored in the hook block 20.
FIG. 5 shows the connected body 40, FIG. 5(a) is a front view, and FIG. 5(b) is a side view. As shown in FIG. 5, the connecting body 40 includes a connecting portion 41, a pair of pulley supporting portions 42, and the like.

The connecting portion 41 is formed in a plate shape, a connecting hole 46 that can be connected to the joining pin penetrates through an upper portion thereof, and a detent pin 43 is fixed at a lower end thereof. Accordingly, when the connecting body 40 is inserted into the cutout groove of the hook block 20 described later, the connecting body 40 can be maintained in a vertical posture without rotating integrally.

Each of the pulley supporting portions 42 is formed in a plate shape, and is fixed to the connecting portion 41 across the detent pin 43 with a space, as shown in FIG. 5B. The width w is set to be longer than the width j of the cutout groove 22 of the hook block 20 described later. Accordingly, the movement of the connecting body 40 can be regulated by the plate 21 described later without the connecting body 40 coming off from the notch groove 22.

A guide pin 44 passing through each of the pulley supporting portions 42 is fitted in each lower portion of the pulley supporting portions 42, and an intermediate pulley 45 is rotatable between the pair of pulley supporting portions 42. Thus, n (two in the present embodiment) pieces are continuously provided in the axial direction of the guide pins 44. The guide pin 44 guides the coupling body 40 to the notch groove 22 of the hook block 20 and allows the coupling body 40 to be reliably inserted into the hook block 20.

The lengths of the rotation stop pin 43 and the guide pin 44 are not particularly limited, but are at least the distance between a pair of plates 21 of the hook block 20 described later, which fulfills the minimum function, and the length of each pin. It does not matter if both end portions are in a state of protruding from the pair of plates 21 of the hook block 20.

4. Configuration of Hook Block 20 Section 4 describes the hook block 20 in which the connector 40 can be stored.
FIG. 6 shows the hook block 20, FIG. 6(a) is a front view, and FIG. 6(b) is a side view. As shown in FIG. 6, the hook block 20 is configured to store a plurality of pulleys in a pair of plates 21.

Specifically, as shown in FIG. 6( a ), the pair of plates 21 have a substantially inverted triangular shape, and the notch groove 22 having a predetermined length in the vertical direction from the central portion of the upper end, They are provided respectively.

Further, hook pins 23 are fitted to the lower part so as to pass through the respective parts, and hanging hooks 24 are fitted to the hook pins 23.

A pair of upper sheave pins 25 pass through the respective plates 21 and are fitted on both sides in the horizontal direction across the notch groove 22, and the upper sheave pins 26 are respectively fitted to the upper sheave pins 25. It is fitted.

At this time, each of the upper sheaves 26 is provided with a space such that at least one sheave can be housed between the pair of upper sheaves 26 in a front view, and as shown in FIG. In addition, the upper pulleys 26 are arranged with a distance such that one of them does not overlap the other in the axial direction in a side view.

Further, lower sheave pins 27 are fitted to approximately the central portion of the hook block 2 (between the notch groove 22 and the hook pins 23) so as to pass through the respective plates 21. n-1 (1 in the present embodiment) lower pulleys 28 are fitted in positions that are vertical to the intermediate pulley, and as shown in FIG. 6B, a pair of upper pulleys 26 in a side view. It is fitted in the center of the space. When there are a plurality of n−1, n (2 in the present embodiment) are continuously arranged in the axial direction of the lower pulley pin 27.

As described above, the connecting body 40 including the intermediate pulleys 45 depending on the distance between the pair of upper pulleys 26 is securely inserted without being interfered with by the upper pulleys 26 when the intermediate pulleys 45 are inserted into the cutout grooves 22. It becomes possible to do.

5. Wiring Wiring will be described below with reference to FIGS. 1 to 4 in the configurations in Sections 1 to 4. In addition, in each drawing of FIG. 1, FIG. 3, and FIG. 4, for convenience, the right side in front view is right, the left side is left, the front side is the front side, the back side is the back side, the top side of the top and bottom is the top side, and the ground side is the bottom side. Define and explain.

As shown in FIGS. 1, 3 and 4, the wire rope 11 fed from a hoisting machine (not shown) has a right top pulley out of a pair of top pulleys 13 rotatably provided on a jib top 12. 13 and then hangs down, is wound around the right upper pulley 26 provided on the hook block 20 (see arrow I), is fed in the horizontal direction, and is located in the middle of the front provided on the coupling body 40. It is wound around the pulley 45 (see arrow II), then hung down, wrapped around the lower pulley 28 provided on the hook block 20 (see arrow III), folded back upward, and wrapped around the intermediate pulley at the back. (Refer to arrow IV), after being fed in the horizontal direction, it is wound on the upper pulley 26 on the left, folded back upward and wound on the top pulley 13 on the left, and then mounted on the turning table of the crane body. Around the machine (not shown).

At this time, as shown in FIGS. 2(a) and 2(c), the right upper pulley 26 and the front intermediate pulley 45 are configured to be on the same line in each radial direction. Similarly, the upper sheave 26 on the left and the intermediate sheave 45 on the back are also configured to be on the same line in each radial direction.

Further, the depth h of the cutout groove 22 of the hook block 20 is set such that when the intermediate pulley 45 of the connecting body 40 is fitted in the lower portion of the cutout groove 22, the wire rope 11 has a groove depth k of the intermediate pulley 45. It is provided so that it will always fit in the lower part.

With this, when the number of hook blocks 20 to be hooked is changed, the wire rope 11 is surely wound around the intermediate pulley 45, so that the change can be surely and safely performed.
If the number of the intermediate pulleys 45 and the lower pulleys 28 increases, the procedure of the arrows II to IV can be performed a plurality of times to increase the number of hook blocks 20 to be hung.

That is, the number of lower sheaves 28 relative to the intermediate sheaves 45 is the number of the intermediate sheaves 45−1, so that when the number of the intermediate sheaves 45 is 3, the number of the lower sheaves 28 becomes 2, and arrows II to IV By performing the procedure twice, it is possible to switch from the two-suspended state to the eight-suspended state.
Thus, by increasing the number of the intermediate pulleys 45 in the axial direction of the pin, and accordingly increasing the number of the lower pulleys 28 by the number of the intermediate pulleys 45 in the axial direction of the pin, the hook block 20 is substantially inverted. The number of products can be increased by changing the length only in the width direction without changing the triangular shape, which makes the parts modular and improves the customizability.

6. Switching Operation Next, the switching operation according to this embodiment will be described with reference to FIGS. 1, 3 and 4.
FIG. 1 shows a two-line suspended state. During normal lifting work, the two ropes are suspended by the wire rope 11, and at this time, the connecting body 40 is fitted into the cutout groove 22 of the hook block 20. Has been inserted.

First, when the wire rope 11 is wound up by the hoist, the hook block 20 and the connecting body 40 are integrally wound up, and the connecting portion 41 of the connecting body 40 enters the gap s of the hanging body 30. Becomes When entering, the joining pin 32 is inserted into the connecting hole 46 provided in the connecting portion 41, and as shown in FIG. 3, the hanging body 30 and the connecting body 40 are firmly connected.
When the wire rope 11 is unreeled by the hoisting machine in this state (the state where the hanging body 30 and the connecting body 40 are connected), the wire is attached to the intermediate pulley 45 of the connecting body 40 as shown in FIG. With the rope 11 wound around, only the hook block 20 is unwound, resulting in a six-hanging state.
At this time, as described above, since the wire rope 11 is securely wound around each intermediate pulley 45, the wire rope 11 does not come off the pulley and the wire rope 11 is not caught on the pin, and the wire rope 11 is safely It is possible to switch from the main suspension state to the six suspension state.

Next, the operation of returning from the six-suspended state to the two-suspended state will be described with reference to FIG.
First, when the wire rope 11 is wound up by the hoist, the hook block 20 is wound up, and the guide pin 44 of the connecting body 40 fixed to the hanging body 30 is inserted into the cutout groove 22 of the hook block 20. It is guided and invades. When it hits the lower portion of the notch groove 22, the winding by the hoisting machine is stopped, the joining by the joining pin 32 is released, and the hanging body 30 and the connecting body 40 can be separated.
At this time, the detent pin 43 of the connecting body 40 is stored in the notch groove 22.
In this state (when the hanging body 30 and the connecting body 40 are separable), when the wire rope 11 is unreeled by the hoisting machine, the hook block 20 and the connecting body 40 are integrated as shown in FIG. It is unwound and it becomes a state of two hanging.
At this time, since the detent pin 43 is housed in the cutout groove 22, movement of the detent pin 43 in the rotation direction is restricted by the cutout groove 22, and the coupling body 40 rotates about the guide pin 44 as a fulcrum. Without fail, the state is surely stored in the notch groove 22.

7. Conclusion As described above, according to the present embodiment, it is possible to implement a crane that is used for construction work and that can switch the number of hanging wire ropes to be hoisted and unwound according to the weight of a suspended load. it can.

Such a crane has a hanging block, one of which is supported by a jib top of the crane, the other having a connecting portion, a hanging hook attached to a lower portion, and a notch groove provided with an upward opening notch groove at an upper portion, and a notch. The hook block is provided with a connecting body that can be inserted into and removed from the groove and that can be connected to the connecting portion, and the hook block is wound and unwound by a wire rope wound around two top pulleys attached to the jib top. The crane is a crane, in which n (n is an integer of 2 or more) intermediate pulleys are connected in the axial direction of the pulley in the lower portion, and a pair of upper pulleys are provided in the notch groove in the upper portion of the hook block. Is provided on both sides in the horizontal direction with the pinch in between, and n-1 lower pulleys are provided in the vertical direction of the intermediate pulley at approximately the center of the hook block, and the wire rope is wound to connect the connecting body to the connecting portion. After that, when the wire rope is unwound, the wire rope is hung on the intermediate pulley to be in a 2×(n+1) main suspension state, the wire rope is wound up, the connecting body is housed in the notch groove, and the wire rope is inserted into the groove of the intermediate pulley. When the connection is released in the state of being housed inside, the connection body and the hook block are integrally wound and switched to the two-hanging state.

Further, it is possible to implement a wiring method that is used for construction work and that can switch the number of hanging wire ropes that are hoisted and unwound according to the weight of the suspended load.

Such a wiring method is one in which one is supported by a jib top of a crane, the other has a hanging body provided with a connecting portion, a hanging hook is attached to a lower portion, and a hook block provided with a notched groove having an upward opening in an upper portion, The hook block includes a connecting body that can be inserted into and removed from the cutout groove and that can be connected to the connecting portion, and the hook block is wound and unwound by a wire rope wound around two top pulleys attached to the jib top. , The connecting body has n (n is an integer of 2 or more) intermediate pulleys continuously arranged in the axial direction of the pulley, and a pair of upper pulleys are horizontally arranged in the upper part of the hook block with a notch groove interposed therebetween. N-1 lower sheaves are provided in the vertical direction of the intermediate sheave at approximately the center of the hook block, and the wire rope hangs from one of the top sheaves to connect the pair of upper sheaves. It is a wiring method that allows a hook block to be wound up and down by winding a wire rope around the top pulley of the other side through each of the top pulleys. Step a in which a wire lobe is wound around one axial side of the intermediate pulleys among the n intermediate pulleys, and n-1 lower pulleys or n-1 lower pulleys after the step a. Among them, step b is laid around one axial side of the lower pulley, and after step b, the other half of the intermediate pulley or the intermediate pulley of the next number is hung from one axial side to the other side of the intermediate pulley. The step c to be rotated is performed, and after the procedure of steps a to c is performed at least once, the other upper pulley is passed.

10 Crane 11 Wire Rope 12 Jib Top 13 Top Pulley 20 Hook Block 22 Notch Groove 24 Lifting Hook 26 Upper Pulley 28 Lower Pulley 30 Hanging Body 40 Linkage 41 Linkage 45 Intermediate Pulley

Claims (6)

One is supported by the jib top of the crane, and the other is equipped with a hanging body,
A hook block with a hanging hook attached to the bottom and a notch groove with an upward opening on the top,
A connecting body that can be inserted into and removed from the cutout groove and that can be connected to the connecting portion;
Equipped with
The hook block is a crane which is hoisted and unwound by a wire rope wound around two top pulleys attached to a jib top,
The connecting body has n (n is an integer of 2 or more) intermediate pulleys continuously arranged in a lower portion thereof in an axial direction of the pulleys.
In the upper part of the hook block, a pair of upper pulleys are provided on both sides in the horizontal direction across the notch groove,
N-1 lower sheaves are provided in the vertical direction of the intermediate sheave at approximately the center of the hook block.
After winding the wire rope to connect the connecting body to the connecting portion, and then lowering the wire rope, the wire rope is hung on the intermediate pulley to be in a 2×(n+1) main suspension state, and the wire rope is wound up, and When the wire rope is stored in the notch groove and the wire rope is accommodated in the groove of the intermediate pulley and the connection is released, the connection body and the hook block are integrally wound and the crane is configured to be switched to the two-hanging state. .. The crane according to claim 1,
The pair of upper pulleys are arranged with a distance of at least approximately one pulley,
crane. In the crane according to claim 1 or 2,
The pair of upper sheaves are arranged with a distance such that one of them does not overlap the other in the axial direction,
crane. The crane according to any one of claims 1 to 3,
The lower sheave is arranged at a center position between the n intermediate sheaves,
crane. The crane according to any one of claims 1 to 4,
The wire rope wound around one of the top pulleys goes through one upper pulley, is wound around the intermediate pulley on one side in the axial direction of the pulley, is wound around the lower pulley, and is wound around the intermediate pulley on the other side. It is in a state of being hung, passed through the other upper pulley, and wound around the other top pulley,
crane. One is supported by the jib top of the crane, and the other is equipped with a hanging body,
A hook block with a hanging hook attached to the lower part and a notch groove with an upward opening on the upper part,
A connecting body that can be inserted into and removed from the cutout groove and that can be connected to the connecting portion;
Equipped with
The hook block is wound and unwound by a wire rope wound around two top pulleys attached to a jib top,
The connecting body has n (n is an integer of 2 or more) intermediate pulleys continuously arranged in a lower portion thereof in an axial direction of the pulleys.
In the upper part of the hook block, a pair of upper pulleys are provided on both sides in the horizontal direction across the cutout groove,
N-1 lower sheaves are provided in the vertical direction of the intermediate sheave at approximately the center of the hook block.
A wire rope is hung from one of the top sheaves, passes through the pair of upper sheaves, and is hung around the other top sheave, thereby enabling the hook block to be wound and unwound. Method,
In the process of passing through a pair of upper pulleys,
A step a in which a wire lobe is hung from one upper pulley to one axial side of the intermediate pulley among the n intermediate pulleys;
After the step a, a step b in which n-1 lower pulleys or a step among the n-1 lower pulleys is wound around one axial side of the lower pulleys;
After step b, step c in which the second intermediate pulley is wound around the other side of the intermediate pulley or from one axial side of the intermediate pulley toward the other side,
Including
After performing the steps a-c at least once,
A wiring method that uses the other upper pulley.

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