JP2016044024A - Roping structure of construction tower crane or gib crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct assembly/disassembly work of a construction tower crane or a gib crane in a safer and more efficient manner.SOLUTION: In a roping structure of a construction tower crane or a gib crane, a movable sheave block which connects a pendant wire extending from the gib side with a derricking drive wire extending from the truss side is disposed at the truss rear side of a crane body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a roping structure for safely and quickly performing a work for pulling a wire rope used for raising and lowering a jib and a work for removing it in a crane such as a building tower crane or a jib crane.

The procedure for assembling a building tower crane or jib crane (hereinafter simply referred to as “crane”) is as follows (FIGS. 6A and 6B).
(Process 1) Install the crane body a.
(Step 2) The jib b is attached to the crane body a.
(Step 3) While supporting the jib b, the undulation drive wire c for performing the undulation operation of the jib b is attached to the undulation sheave block d provided in the middle of the jib.
(Step 4) The undulation drive wire c is fixed to the tail of the undulation winch drum f through the top sheave e at the top of the truss a1, and the undulation winch drum f is wound around the undulation drive wire c, b Tension the pendant wire g connected to the tip.

FIG. 6C shows a schematic diagram of a conventional roping structure according to FIG. 6A.
When raising the jib b, the hoisting drive wire c is wound up by the hoisting winch drum f, the winding distance l is shortened, and the pendant wire g is tensioned.
On the other hand, when the jib is lowered (turned down), the hoisting driving wire c is unwound, the winding distance l is increased, and the tension on the pendant wire g is released.

  In addition, the jib crane described in the following Patent Document 1 also has the above-described conventional roping structure.

JP 2012-25540 A

In the conventional method, there is room for improvement in at least one of the following viewpoints.
(1) Viewpoint of travel distance.
The rolling operation of the undulation drive wire c shown in the above (Step 3) is performed between the truss top of the crane body a and the undulation sheave block d provided in the middle of the jib b with the worker holding a heavy wire rope. Since it must be reciprocated many times, the burden on the worker increases.
(2) Viewpoint of working at height.
Since the work of (Step 3) is also a dangerous work at a high place, it is necessary to pay much attention to the safety management of workers.
(3) Efficiency point of view.
When the number of undulations of the undulation drive wire c is large, the number of reciprocations to the jib b and the undulation sheave block d also increases, so the operator's work time naturally increases.
In addition, the operation of the above (Step 3) is always performed at the time of assembly and disassembly.

Building tower cranes and jib cranes are heavy machines that frequently repeat assembly and dismantling due to their properties, and the above-mentioned concerns (1) to (3) arise each time.
If these concerns can be alleviated / resolved, it will be possible to provide more convenient building tower cranes and jib cranes.

  That is, an object of the present invention is to provide means capable of more safely and efficiently carrying out crane assembling / disassembling work.

A first invention of the present application to solve the above problems is a roping structure for a building tower crane or a jib crane, which is a movable sheave block that connects a pendant wire extending from the jib side and an undulating drive wire extending from the truss side. Is arranged behind the truss of the crane body.
The second invention of the present application is characterized in that, in the first invention, the pendant wire is multiply hung on the movable sheave block.
The third invention of the present application is characterized in that in the first invention or the second invention, a movable pendant block capable of tensioning the pendant wire independently of the movable sheave block is further provided.

According to the present invention, at least one of the effects described below can be obtained.
(1) Viewpoint of travel distance.
Since the roping work is almost completed near the truss of the crane body, it is not necessary for the worker to move to the jib, and the movement distance of the worker can be shortened.
(2) Viewpoint of working at height.
Since it is not necessary for the worker to move to the jib, it is possible to eliminate dangers such as a worker's dropping accident.
(3) Efficiency point of view.
Since the movement distance of the worker is shortened, it naturally contributes to shortening the work time.
Moreover, shortening the working time at the site can be expected by completing the rolling operation of the undulation drive wire and the part of the pendant wire at the maintenance shop or the assembly site in advance.

1 is a schematic front view showing a crane using a roping structure according to Embodiment 1. FIG. 1 is a schematic diagram of a roping structure according to Embodiment 1. FIG. The schematic diagram which shows the state which wound up the undulation drive wire in FIG. 2A. The schematic front view which shows the state which wound up the undulation drive wire in FIG. FIG. 6 is a schematic diagram of a roping structure according to a second embodiment. The schematic diagram which shows the state which pulled down the pendant block in FIG. 4A. FIG. 6 is a schematic diagram of a roping structure according to a third embodiment. The schematic front view which shows the crane using the conventional roping structure. The schematic front view which shows the state which wound up the undulation drive wire in FIG. 6A. The schematic diagram of the conventional roping structure.

  Embodiments of the present invention will be described below with reference to the drawings.

First, the roping structure according to the first embodiment of the present invention will be described.
<1> Overall configuration.
Please refer to FIG. The present invention is a roping structure applied to a crane such as a building tower crane or a jib crane.
The roping structure according to the present invention is an invention characterized by the arrangement form of the movable sheave block 30 that connects the pendant wire 10 extending from the jib B side of the crane and the undulation drive wire 20 extending from the truss A1 side of the crane. is there.
Details of each member will be described below.

<2> Pendant wire.
The pendant wire 10 is a wire attached to the jib B side.
The pendant wire 10 has one end attached to the tip of the jib B and the other end attached to the movable sheave block 30.
The length of the pendant wire 10 is constant, and the undulation operation of the jib B can be performed by the tension or release operation of the pendant wire 10 by the movement of the movable sheave block 30 attached to the other end.

<2.1> Splitting the pendant wire.
Since the pendant wire 10 is long, it is desirable to divide it into an appropriate length. In this embodiment, the pendant wire 10 has a structure in which a truss-side pendant wire 10a and a jib-side pendant wire 10b are connected.

<3> Undulating drive wire.
The undulation drive wire 20 is a wire attached to the truss A1 side of the crane body A.
The hoisting drive wire 20 is wound between the movable sheave block 30 and the fixed sheave block 40, and one end on the fixed sheave block 40 side is attached to the hoisting winch drum 50.
By winding the hoisting drive wire 20 with the hoisting winch drum 50, the movable sheave block 30 can be pulled toward the hoisting winch drum 50.

<4> A movable sheave block.
The movable sheave block 30 is a member for connecting the pendant wire 10 and the undulation drive wire 20.
The movable sheave block 30 includes a first sheave 31 for winding the pendant wire 10 and a second sheave 32 for winding the undulation drive wire 20.

<4.1> A movable structure.
The movable sheave block 30 is arranged in a region behind the truss A1 of the crane body A and is configured to be movable by winding and unwinding operation of the undulation drive wire 20.

<4.2> Temporary fixing structure.
The movable sheave block 30 is configured to be temporarily fixed to a stay or the like of the truss body separately from the movable structure described above.

<5> Example of operation.
Next, the operation of the movable sheave block 30 will be described with reference to FIGS. 2A, 2B, and FIG.
FIG. 2A shows a state before winding the undulation drive wire 20, and FIG. 2B shows a state after winding the undulation drive wire 20.
In the state of FIG. 2A, wound distance undulations driving wire 20 between the fixed sheave block 40 and the movable sheave block 30 is L _1.
From this state, when the hoisting drive wire 20 is wound with the hoisting winch drum 50, the movable sheave block 30 is drawn toward the hoisting winch drum 50, and between the movable sheave block 30 and the fixed sheave block 40. wound distance undulations drive wire 20 shrinks to L _2.
The pulling operation of the movable sheave block 30 causes the pendant wire 10 to be tensioned and then pulled to the crane body A side to raise the jib B as shown in FIG.

<5.1> Multiple strands of pendant wire.
The stroke between the tension of the pendant wire 10 and the minimum working radius after the tension of the pendant wire 10 is proportional to the moving distance of the movable sheave block 30.
Then, due to the arrangement of the movable sheave block 30 in the region behind the truss A1, the allowable length of the moving distance of the movable sheave block 30 may be shorter than that of the conventional structure.
Therefore, in order to be able to secure a longer stroke for raising the jib B even if the moving distance of the movable sheave block 30 is short, in the present invention, the multiplying number of the pendant wire 10 attached to the movable sheave block 30 is set. Configure to increase as much as possible.

As shown in FIGS. 2A and 2B, in this embodiment, the pendant wire 10 extending to the jib B side is a double hanger, and the pendant wire 10 attached to the movable sheave block 30 is connected via a fixed sheave 70 provided separately. It's 4 lines.
According to this configuration, the movement amount of the pendant wire 10 and the movement amount of the movable sheave block 30 are 2: 1, and the movement amount of the movable sheave block 30 can be halved.

<6> Usage example.
A usage example of a crane to which the above roping structure is applied will be described.
<6.1> State before assembly (not shown)
(1) Temporarily fixing each sheave block.
Assume that the rolling drive wire 20 is roped in advance on the maintenance shop or on the assembly site.
First, the movable sheave block 30 is temporarily fixed to the upper side of the rear stay of the truss A1, and the fixed sheave block 40 is temporarily fixed to the lower side of the rear stay of the truss A1.
In this state, the undulation drive wire 20 is roped between the movable sheave block 30 and the fixed sheave block 40.

(2) Treatment of undulation drive wire.
After the roping between the movable sheave block 30 and the fixed sheave block 40 is completed, one end of the undulation drive wire 20 is temporarily fixed to the rear stay of the truss A1 or an appropriate portion of the fixed sheave block 40, and the truss A1 Is mounted on the tail of the hoisting winch drum 50.
On the other hand, the other end of the undulation drive wire 20 is fixedly attached to a predetermined location.

(3) Pendant wire processing.
The truss side pendant wire 10 a can be attached to the movable sheave block 30 in advance.
The pendant wire 10b on the jib side is temporarily fixed to the back surface or the upper surface of the jib B when the jib B is assembled.

<6.2> Work in the field (1) Connection of the pendant wire (FIG. 1).
After attaching the grounded jib B to the crane body A, the pendant wire 10a on the truss side and the pendant wire 10b temporarily fixed on the jib side are connected.

(2) Pendant wire tension (Figure 3).
Next, the fixed sheave block 40 is fixed at a predetermined position, and the temporary fixing of the movable sheave block 30 is released.
When the hoisting winch drum 50 is driven in this state, the movable sheave block 30 moves downward, and the pendant wire 10 is tensioned.
As the pendant wire 10 is tensed and the undulating winch drum 50 continues to be driven, the jib B can move in the region from the maximum working radius to the minimum working radius.

  Thus, according to the roping structure according to the present embodiment, the opportunity for the worker to walk on the jib B is only when the pendant wire 10 is connected. There is no need to walk.

Next, a roping structure according to a second embodiment of the present invention will be described with reference to FIGS. 4A and 4B.
<1> About the stroke of the movable sheave block.
The movement amount (stroke) of the movable sheave block 30 described in the first embodiment includes a stroke required to tension the pendant wire 10 to a position where the jib B can be supported.
If the stroke during this time can be supplemented by another means, it is possible to design with the effective minimum stroke required for the actual work of the crane, and to expect the merit that the member length of the rear stay of the truss A1 can be shortened.

<2> Addition of movable pendant block.
Therefore, in the roping structure according to the present embodiment, a movable pendant block 80 is newly provided as shown in FIG. 4A.
The movable pendant block 80 includes a third movable sheave 81 for hanging the pendant wire 10, a fourth movable sheave 82 for hanging the pulling wire 90 to draw the movable pendant block 80 toward the fixed sheave block 40, and a pulling The rear movable pendant block 80 is constituted by a bracket (not shown) for fixing to the crane body A.
One end of the pulling wire 90 can be fixed at a predetermined position, and the other end can be connected to the undulating winch drum 50.
Between the movable pendant block 80, the fixed sheave 70 and the movable sheave block 30, the pendant wire 10 is configured to be multiply hung. In the present embodiment, the multiplying number of the pendant wire 10 is 6 and the stroke ratio is 3: 1.

<3> Example of operation (1) Temporarily fixing the movable sheave block.
First, the movable sheave block 30 is temporarily fixed.
(2) Pull the pendant block.
The movable pendant block 80 is pulled toward the undulating winch drum 50 by connecting the pulling wire 90 to the undulating winch drum 50 and winding it.
Following this pulling operation, the pendant wire 10 wound around the third movable sheave 81 is tensioned.
Therefore, the pendant wire 10 can be tensioned to a position where the jib B can be supported while the movable sheave block 30 is temporarily fixed.
(3) Fixing the movable pendant block.
Thereafter, the movable pendant block 80 is fixed to the crane body A.
(4) Switching the winding target.
Then, the connecting point of the hoisting winch drum 50 is switched from the pulling wire 90 to the hoisting drive wire 20.
Note that this step is not necessary when the pulling wire 90 is wound and unwound using a separately provided chain block or the like.
(5) Pulling the movable sheave block.
Finally, if the rolling drive wire 20 is wound up in the same manner as in the first embodiment after the temporary fixing of the movable sheave block 30 is released, the rolling operation of the jib B is started immediately after winding up the rolling drive wire 20. It becomes possible.

  As described above, according to the roping structure according to the present embodiment, the initial tension operation for eliminating the looseness of the pendant wire 10 is assigned to the movable pendant block 80, so that the stroke of the movable sheave block 30 is changed to the undulation operation of the jib B. Therefore, the tension or opening operation of the pendant wire 10 can be ensured to the maximum.

Next, a roping structure according to a third embodiment of the present invention will be described with reference to FIG.
The roping structure according to the present embodiment is a structure in which the function of the pulling wire 90 is combined with the undulation drive wire 20 in the roping structure described in the second embodiment.
Specifically, one end of the undulation drive wire 20 wound between the movable sheave block 30 and the fixed sheave block 40 is further wound around the fourth sheave 82 constituting the movable pendant block 80 and fixed. The other end of the drive wire 20 is connected to the undulating winch drum 50.
For convenience of explanation, the illustration of the third sheave 81 around which the pendant wire 10 is wound is omitted.

If the movable sheave block 30 is temporarily fixed and the movable pendant block 80 is in a movable state, if the undulation drive wire 20 is wound up, the movable pendant block 80 is pulled.
On the contrary, if the movable sheave block 30 is in a movable state and the movable pendant block 80 is fixed, if the undulation drive wire 20 is wound up, the movable sheave block 30 is pulled.

  According to the roping structure according to this embodiment, the pulling operation of the movable sheave block 30 and the pulling operation of the movable pendant block 80 can be performed without changing the wire to the undulating winch drum 50.

In implementing the roping structure according to the present invention, the configuration of the wire, sheave, block, winch and the like for providing the movable sheave block and the movable pendant block can be determined within a known range.
Therefore, the scope of rights of the present invention is not limited to the above-described embodiments.

10 Pendant wire 20 Relief drive wire 30 Movable sheave block 31 First sheave 32 Second sheave 40 Fixed sheave block 50 Relief winch drum 60 Top sheave 70 Fixed sheave 80 Movable pendant block 81 Third movable sheave 82 Fourth movable Sheave 90 Pulling wire A Crane body A1 Truss B Jib

Claims (3)

A building tower or jib crane roping structure,
A movable sheave block that connects the pendant wire extending from the jib side and the undulation drive wire extending from the truss side is arranged behind the truss of the crane body,
Building tower crane or jib crane roping structure. A plurality of the pendant wires are hung on the movable sheave block,
The building tower crane or jib crane roping structure according to claim 1. A movable pendant block capable of tensioning the pendant wire independently of the movable sheave block is further provided.
The building tower crane or jib crane roping structure according to claim 1 or 2.

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