JPH07291587A - Tower crane - Google Patents

Abstract

PURPOSE:To disassemble and assemble a swing lever and carry the disassembled swing lever efficiently and safely. CONSTITUTION:A swing lever 32 is formed by connecting a tip side of a first leg part 33 rotationally fit in a tower boom 7 at its base end side and a tip side of a second leg part 36 rotationally connected by a pin with a base side of the first leg part 33 at its base end side by a pendant rope 39. Thereby, weight of the swing lever 32 is lightened and hanging load ability of a tower crane can be improved. Disassembling and assembling work of the swing lever can be easily and safely performed and also folded first leg part 33 and the second leg part 36 are tied and fixed by the pendant rope 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower crane suitable for use in, for example, material transportation to a high place on a construction site.

[0002]

2. Description of the Related Art Generally, at a construction site such as a high-rise building, a tower crane is usually used for carrying materials from the ground to a high place.

Therefore, FIGS. 5 to 9 show a tower crane according to the prior art.

In the drawing, 1 is a lower traveling body, 2 is an upper revolving body as a crane main body which is rotatably provided on the lower traveling body 1, and on the upper revolving body 2, a guide is provided on the tip side. An A-shaped frame 3 having a sheave 3A is provided. Further, the upper revolving structure 2 is provided with a main winding drum 4, an auxiliary winding drum 5, and an undulating drum 6.

Reference numeral 7 denotes a tower boom whose base end side is attached to the front part of the upper swing body 2 so as to be capable of undulating. The tower boom 7 has a frame structure and is formed to have a length of about 30 m to 45 m. Rope 19 undulating drum 6
The upper revolving structure 2 by winding or unwinding by
Undulate against.

Reference numeral 8 denotes a tower jib having a frame structure attached to the tip end side of the tower boom 7 so as to be able to move up and down. The tower jib 8 is formed to have a length of about 20 m to 40 m and supplements a tower jib hoisting rope 12B described later. The tower boom 7 is lifted and lowered by being wound up or unwound by the winding drum 5.

Reference numeral 9 denotes a main winding rope whose one end side is wound around the main winding drum 4, and the other end side of the main winding rope 9 is wound around a load hanging hook 10 suspended from the tip end side of the tower jib 8. . The main rope 9 is wound around the main drum 4 so that the load hook 10 can lift the load.

Reference numerals 11 and 11 denote tower jib support ropes composed of two or more even numbered ropes for connecting the tip end side of the tower jib 8 and a swing lever 20 to be described later, and 12 and 12 have one end side wound around the auxiliary winding drum 5 and the other. Two auxiliary winding ropes whose end sides are connected to the swing lever 20 are shown, and a tower jib bridle 13 having a plurality of sheaves (not shown) in the middle of each auxiliary winding rope 12, and the tower jib bridle. A tower jib hanger 14 having a plurality of sheaves (not shown) around which a tower jib undulating rope 12B, which will be described later, is wound is provided.

Here, each auxiliary winding rope 12 is sequentially wound around a swing lever supporting rope 12A connecting the swing lever 20 and the tower jib bridle 13 and each sheave of the tower jib bridle 13 and the tower jib hanger 14. After that, the tower jib undulating rope 12B wound around the auxiliary winding drum 5 is formed.

When the tower jib undulating rope 12B is wound around the auxiliary winding drum 5, the tower jib bridle 13 and the tower jib hanger 14 are brought close to each other to raise the tower jib 8 upward, while the tower jib undulating rope 12B is supplemented. When unwound from the winding drum 5, the tower jib bridle 13 and the tower jib hanger 14 are separated from each other, and the tower jib 8 is tilted downward.

Reference numeral 15 denotes a tower boom support rope (only one is shown) consisting of two or more even ones, one end side of which is attached to the tip end side of the tower boom 7 via a bracket 16.
7 is a tower boom bridle attached to the other end of the tower boom support rope 15, and 18 is a tower boom hanger attached to the tip side of the A-shaped frame 3 so as to face the tower boom bridle 17. The tower boom hanger 18, tower boom bridle 17
One end side of the tower boom hoisting rope 19 is wound around, and the other end side of the tower boom hoisting rope 19 is wound around the hoisting drum 6 via the guide sheave 3A.

By winding the tower boom hoisting rope 19 around the hoisting drum 6, the tower boom bridle 17 and the tower boom hanger 18 are brought close to each other to raise the tower boom 7, and the tower boom hoisting rope 1
By unwinding 9 from the undulating drum 6, the tower boom bridle 17 and the tower boom hanger 18 are separated from each other, and the tower boom 7 is tilted.

Reference numeral 20 denotes a triangular swing lever rotatably attached to the tip end side of the tower boom 7.
The swing lever 20 raises and lowers the tower jib 8 with respect to the tower boom 7.

Since the swing lever 20 is disassembled at the time of transportation of the tower crane and assembled and used at the time of work, various structures have been proposed so that disassembling, assembling work and carrying work after dismantling can be performed efficiently. ing.

For example, the swing lever 20 described in Japanese Utility Model Laid-Open No. 59-127095 has a structure as shown in FIG.
The base end side is the tower boom 7 via the brackets 16 and 16.
Rotatably attached to the tip side of the plurality of beams 21,
A first leg portion 22 reinforced by 1, and a plurality of beams 23 rotatably attached to the base end side of the first leg portion 22.
.., and a pair of stays 25, 25 connected to the tip ends of the first leg 22 and the second leg 24, respectively, which are 4 m each. It has a length of about 6 m. Each stay 25 has a first stay 25A having a substantially equal length.
And the second stay 25B to the connecting pin 25 as shown in FIG.
The first stay 25A and the second stay are configured to be foldable at C.
The stay 25B is the mounting pin 2 as shown in FIGS.
It is held by 6 in a linearly extended state.

The tower crane according to the prior art has the above-described structure. For example, at the time of transportation, the tower boom 7 and the tower jib 8 in the working state shown in FIG. As shown in, perform the disassembly work by tilting it to the ground side.

First, by unwinding the tower jib undulating rope 12B from the auxiliary winding drum 5, the tower jib bridle 13 and the tower jib hanger 14 are separated from each other, and the tower jib 8 and the swing lever 20 are folded toward the tower boom 7 side. knock down. And tower boom undulating rope 19
The tower boom bridle 17 and the tower boom hanger 18 are separated from each other by unwinding the
As shown in FIG. 7, the tower boom 7 is tilted to the ground side together with the tower jib 8 and the swing lever 20 until the top of the swing lever 20 contacts the ground G.

In this way, the swing lever 20 disposed on the tip side of the tower boom 7 is disassembled with the tower boom 7 in a tilted state.

First, the first stay 25A and the second stay 25
Remove the mounting pin 26 from the connecting portion with B. Next, the tower jib undulating rope 12B is unwound from the auxiliary winding drum 5 to loosen the swing lever support rope 12A, and the first leg 22
Is rotated toward the second leg 24 side in the direction of arrow A shown in FIG. 8 with the connecting portion with the bracket 16 as a fulcrum.

As a result, the first leg portion 22 and the second leg portion 24 are
Is folded so that the first stay 25A and the second stay 25B are bent in the arrow B direction around the connecting pin 25C (see FIG. 9). Then, the base end side of the first leg portion 22 is removed from the bracket 16 and the first leg portion 2
By removing the swing lever support rope 12A from the tip end side of 2 and the tower jib support rope 11 from the tip end side of the second leg portion 24, respectively, the swing lever 20 can be moved as shown in FIG.
The swing lever structure 20 'in the folded state is removed as shown in Fig. 2 and is transported to the transportation vehicle by, for example, a small crane.

Also, the disassembled swing lever structure 2
When assembling 0 ', the base end side of the first leg portion 22 is attached to the bracket 16 while the tip end side of the second leg portion 24 is grounded.
Install on. Next, the swing lever support rope 12A is attached to the tip end side of the first leg portion 22, and the tower jib undulating rope 12B is wound by the auxiliary winding drum 5, thereby opening the first leg portion 22 from the second leg portion 24 and The first stay 25A and the second stay 25B are linearly extended from the folded state, and the attachment pins 26 are attached to the connecting portions, so that the swing lever 20 is assembled into the triangular shape shown in FIG.

By the way, in the above-mentioned prior art, the swing lever 20 used in the tower crane is mounted on the first leg portion 2.
2, the second leg portion 24 and a stay 25 that connects them, and the stay 25 is configured to be foldable from the first stay 25A and the second stay 25B via the connecting pin 25C. Has a disadvantage that the structure thereof is complicated and the weight of the swing lever 20 as a whole is increased, and as a result, the lifting capacity of the tower crane is reduced.

Further, since the swing lever 20 is normally formed to have a side length of about 4 m to 6 m, the first stay 25A and the second stay 25B can be maintained even when the swing lever 20 is grounded as shown in FIG. Connection part with (mounting pin 2
The ground height H of 6) is 2 m to 3 m or more, and there is a problem that the work of mounting and removing the mounting pin 26 at the time of disassembling or assembling is performed at a high place, which is dangerous.

As another conventional technique, another swing lever has been proposed in which the tip ends of the first leg and the second leg are connected by chains. Then, according to the other swing lever configured as described above, the mounting pin 26 is attached to the stay 25 with danger as described above,
There is an advantage that the removal work is unnecessary, the efficiency of the disassembly and assembly work can be improved, and the weight of the entire swing lever can be reduced.

[0025]

However, in another swing lever in which the tip ends of the first leg portion and the second leg portion are connected by a chain, the first leg portion and the second leg portion are Since the chain becomes loose when it is folded, handling of the chain becomes troublesome, and the first leg part and the second leg part may be damaged by the chain due to vibration during transportation. The swing lever structure in the state becomes unstable, and there is a problem that not only the transfer work to a transportation vehicle using a small crane or the like cannot be performed efficiently, but also the safety thereof deteriorates.

The present invention has been made in view of the above-mentioned problems of the prior art. The swing lever can be made lighter in weight, the lifting capacity can be improved, and the swing lever can be disassembled, assembled and transported efficiently. The purpose of the present invention is to provide a tower crane that can be safely operated.

[0027]

In order to solve the above-mentioned problems, a tower crane of the present invention is a crane main body having a main winding drum, an auxiliary winding drum, and a hoisting drum, and is mounted so as to be hoistable on the crane main body. A tower boom that is undulated by the undulating drum, a tower jib that is attached to the tip side of the tower boom so that it can be lifted and lowered, one end side is wound around the main winding drum, and the other end side hangs down from the tip side of the tower jib. The main winding rope wound around the load hanging hook and the tower jib are rotatably provided on the tip end side of the tower boom to raise and lower the tower jib with respect to the tower boom, and the tower jib is provided via a support rope. A swing lever connected to the tip side of the auxiliary winding rope, and an auxiliary winding rope having one end wound around the auxiliary winding drum and the other end connected to the swing lever. It is.

According to the present invention, the swing lever includes a first leg portion having a base end side rotatably attached to the tip end side of the tower boom and a tip end side connected to the other end side of the auxiliary winding rope. A second leg part having a base end side rotatably pin-coupled to the base end side of the first leg part, and a tip end side connected to the support rope; and a second leg part having a constant length and both end sides of the second leg part. The pendant rope is detachably connected to at least one of the tip side of the leg and the tip side of the first leg.

[0029]

With the above structure, since the pendant rope is composed of a flexible wire rope or the like having a certain length, the first leg is not disturbed by the pendant rope when the swing lever is attached or detached. The part and the second leg can be easily folded. And the first leg,
By removing the pendant rope from either one of the second leg portions, the pendant rope can be used to easily bundle the tip ends of the first leg portion and the second leg portion in the folded state. This makes it possible to fix the entire swing lever in a state suitable for carrying work.

[0030]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiments, the same components as those of the prior art shown in FIGS. 5 to 8 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a tower crane according to the present invention, and the tower crane 31 has a lower traveling body 1, a crane having a main winding drum 4, a auxiliary winding drum 5 and an undulating drum 6 as in the prior art. An upper revolving structure 2 as a main body, a tower boom 7 attached to the upper revolving structure 2 so as to be able to rise and fall, a tower jib 8 attached to the tower boom 7 so as to be able to move up and down, and one end side is wound around a main winding drum 4. The main winding rope 9 is wound around a load-hanging hook 10 whose other end is hung from the tip end side of the tower jib 8 and the tower boom 7, and the tower boom is rotatably provided. The swing lever 32 is connected to the tip side of the auxiliary winding rope 12 and one end of the swing lever 32 is wound around the auxiliary winding drum 5, and the other end of the auxiliary winding rope 12 is connected to the swing lever 32. That.

However, the present invention is different from the prior art in the structure of the swing lever 32, and the swing lever 32 according to this embodiment will be described below.

In the figure, 33 is the bracket 16 or 1 on the base end side.
6 shows a first leg portion rotatably attached to the tip end side of the tower boom 7 via 6, and the first leg portion 33 includes a pair of leg body 33A, 33A and each leg body 33A. Base end side mounting plates 33B and 33B provided on the respective base end sides,
Tip side mounting plate 3 provided on the tip side of each leg body 33A
3C, 33C and a plurality of beams 34, 34, ... Provided between each leg body 33A. And
Attach each base end side mounting plate 33B and each bracket 16 to the pin 3
The first leg portion 33 is rotatably attached to the tower boom 7 by being connected by 5, 35.
Swing lever support ropes 12A and 12A are attached to each tip side attachment plate 33C.

Reference numeral 36 denotes a second leg portion whose base end side is rotatably pin-connected to the base end side of the first leg portion 33, and the second leg portion 36 is provided.
Is a pair of leg bodies 36A, 36A and each leg body 3
Tip side mounting plate 36 provided on each tip side of 6A
B, 36B and a plurality of beams 37, 37, ... Provided between each leg body 36A. Then, the tower jib support rope 11,
One end side of 11 is attached and each tower jib support rope 1
The other end side of 1 is attached to the tip end side of the tower jib 8.

Reference numerals 38 and 38 denote a pair of mounting plates located on the base end side of the second leg portion 36 and projectingly provided on each leg portion main body 36A, and each mounting plate 38 is the first leg portion 33. When the second leg portion 36 and the second leg portion 36 are folded, a fixture 39C for each pendant rope 39 described later can be attached.

Reference numerals 39 and 39 denote the distal end side of the first leg portion 33 and the second leg portion.
A pendant rope that connects the distal end side of the leg portion 36 is shown. Each of the pendant ropes 39 has a wire rope 39A having a fixed length, a fixture 39B fixed to one end side of the wire rope 39A, and the like. It is composed of another fixture 39C fixed to the end side. Then, each attachment 39B is detachably attached to each tip-side attachment plate 33C of the first leg portion 33, and each attachment 39C is attached to each tip-side attachment plate 36B of the second leg portion 36 via a pin or the like. ing.

In this way, the swing lever 32 is
The first leg portion 33, the second leg portion 36 and each pendant rope 39 are assembled into a substantially triangular shape.

The tower crane 31 according to the present invention has the swing lever 32 constructed as described above,
There is no particular difference in the basic operation thereof from the prior art.

However, in this embodiment, the swing lever 32 has the first leg portion 33 whose base end side is rotatably attached to the tower boom 7, and the base end side attachment plate 33B of the first leg portion 33. The second leg portion 36 rotatably attached to the first leg portion 33 and the second leg portion 36 are detachably connected by the pendant rope 39. For example, the swing lever 32 during transportation
The following operational effects can be obtained in disassembling, assembling work, and the like.

First, when the swing lever 32 is disassembled, the tower boom 7 is grounded until the tip end side mounting plate 36B of the second leg portion 36 constituting the swing lever 32 is grounded as shown in FIG. Defeat it to the side. In this state, from the tip side mounting plate 36B of the second leg portion 36 to the pendant rope 39
Remove the attachment 39C from the tower jib undulating rope 12B.
Is unwound from the auxiliary winding drum 5, the swing lever support rope 12A is loosened, and the first leg 33 is rotated toward the second leg 36 side in the arrow A'direction shown in FIG. Let

In this way, as shown in FIG. 4, after the first leg portion 33 and the second leg portion 36 are folded, the pin 35 is pulled out to remove the first leg portion 33 from the bracket 16 and Swing lever support rope 12A from the tip side attachment plate 33C of the first leg portion 33, and the tip side attachment plate 36B of the second leg portion 36.
By removing the tower jib support ropes 11 from, the swing lever 32 is in the folded state as shown in FIG. 4, and is removed from the tower boom 7.

Then, with the first leg portion 33 and the second leg portion 36 folded, the fixture 39C of the pendant rope 39 removed from the tip side attachment plate 36B of the second leg portion 36 is fixed by a bolt or the like. It is fixed to a mounting plate 38 protruding from the second leg portion 36. At this time, by engaging the pendant rope 39 with each beam 37 fixed to the second leg portion 36, the swing in which the first leg portion 33 and the second leg portion 36 are bundled in a folded state and fixed A lever structure 32 'can be obtained.

When assembling the swing lever structure 32 ', the base end side mounting plate 33B of the first leg portion 33 is fixed to the pin 35 with the tip side mounting plate 36B of the second leg portion 36 grounded. To the bracket 16 via the mounting plate 38
Remove the attachment 39C of the pendant rope 39 from. Next, the swing lever support rope 12A is attached to the tip side attachment plate 33C of the first leg portion 33, and the tower jib undulating rope 12B is wound by the auxiliary winding drum 5,
The leg 33 is opened from the second leg 36. Then, the swing lever 32 is assembled into the triangular shape shown in FIG. 2 by attaching the attachment 39C of the pendant rope 39 to the tip side attachment plate 36B of the second leg portion 36.

As described above, according to this embodiment, when the swing lever 32 is disassembled, the first leg 33 and the second leg 3 are separated.
Fixture 3 of pendant rope 39 for folding 6 and
9C is removed from the mounting plate 36B on the distal end side of the second leg 36, or when the swing lever 32 is assembled.
In order to connect the leg portion 33 and the second leg portion 36, the work of attaching the attachment 39C of the pendant rope 39 to the tip side attachment plate 36B of the second leg 36 can be safely performed by ground work.

Further, by obtaining the swing lever structure 32 'in which the first leg portion 33 and the second leg portion 36 are bundled in a folded state and fixed, it is possible to transfer the swing lever structure 32' to a transportation vehicle using, for example, a small crane. Work can be performed efficiently and safely.

In the above embodiment, the attachment 39B provided on one end side of the pendant rope 39 and the attachment 39C provided on the other end side are attached to the tip side attachment plate 33C of the first leg portion 33. , To the tip side mounting plate 36B of the second leg portion 36,
The case where they are detachably attached has been described as an example, but for example, the attachment 39B and the tip side attachment plate 33C of the first leg 33 may be attached irremovably (but rotatably). .

In the above embodiment, the case where the mounting plate 38 for fixing the mounting tool 39C of the pendant rope 39 is provided on the second leg 36 so as to project is described as an example. As shown by the chain double-dashed line, a female screw portion 40 or the like is bored in the base end side mounting plate 33B of the first leg portion 33, and the female screw portion 4
The fixture 39C may be fixed by a bolt screwed into 0.

Further, the attachment 39C is attached to the tip side attachment plate 36.
It may be fixed to B, and the fixture 39B may be fixed to a bolt or the like that is screwed into the female screw portion 40.

Furthermore, in the above-described embodiment, the tower crane having the lower traveling body 1 is described as an example, but the present invention is not limited to this, and for example, a fixed tower crane having no lower traveling body or the like. Can also be applied to.

[0050]

As described above in detail, according to the present invention, the base end side of the first leg is rotatably attached to the tower boom, and the base end side of the first leg is pivoted. Since the swing lever is configured by connecting the distal end side of the second leg portion that is pin-coupled as possible with the flexible pendant rope, it is possible to reduce the weight of the swing lever,
The lifting capacity of the tower crane can be improved.
When the swing lever is disassembled, the first leg and the second
The work of folding the leg portion and the work of connecting the first leg portion and the second leg portion at the time of assembling the swing lever can be efficiently and safely performed.

Furthermore, since the first leg portion and the second leg portion can be bundled and fixed in a folded state by the pendant rope, a small crane or the like is used when transporting the folded swing lever. The transfer work to the transportation vehicle can be performed efficiently and safely.

[Brief description of drawings]

FIG. 1 is an overall view showing a tower crane according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing an enlarged swing lever according to an embodiment.

FIG. 3 is an external view showing a swing lever disassembly work state according to the embodiment.

FIG. 4 is an external view showing a state in which the swing lever according to the embodiment is folded.

FIG. 5 is an overall view showing a tower crane according to the related art.

FIG. 6 is a partially cutaway perspective view showing an enlarged swing lever according to a conventional technique.

FIG. 7 is an overall view of a tower crane showing a state in which a tower boom or the like is tilted to the ground side.

FIG. 8 is an external view showing a disassembled work state of the swing lever.

FIG. 9 is an external view showing a state in which a swing lever is folded.

[Explanation of symbols]

 2 Upper revolving structure (crane body) 4 Main winding drum 5 Auxiliary winding drum 6 Elevating drum 7 Tower boom 8 Tower jib 9 Main winding rope 10 Lifting hook 11 Tower jib support rope 12 Auxiliary rope 12A Swing lever support rope 12B Tower jib undulation rope 32 Swing lever 33 First leg 36 Second leg 38 Mounting plate 39 Pendant rope 40 Female thread

Claims (1)

[Claims] 1. A crane main body having a main winding drum, an auxiliary winding drum, and a hoisting drum, a tower boom that is mounted to the crane main body so as to be hoisted, and hoists by the hoisting drum, and a tower boom is located on the tip side. A tower jib movably attached to the tower jib, one end of which is wound around the main winding drum, and the other end of which is wound around a load-hanging hook that hangs down from the tip end of the tower jib, and the tower jib is attached to the tower jib. A swing lever that is rotatably provided on the tip side of the tower boom and is connected to the tip side of the tower jib via a support rope for raising and lowering the boom and one end side is wound around the auxiliary winding drum. In the tower crane, the other end side of which is a supplementary rope connected to the swing lever, the swing lever has a base end side of the tower boom. A rotatably pin-coupled to the tip side of the
A leg portion, a second leg portion having a base end side rotatably attached to the base end side of the first leg portion, and a tip end side connected to the support rope; A tower crane comprising a pendant rope detachably connected to at least one of the tip side of the second leg and the tip side of the first leg.