JPH1160167A - Tower crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove a swing lever from a tower boom in a condition in which the tower boom is erected. SOLUTION: One connection member 10B positioned on a pin 13 side of a swing lever 32 more than a main winding rope 23 among a plurality of connection members 10B which constitute a frame body 10 of the swing lever 32 is used as a split connection member 33, and this split connection member 33 consists of right and left split pipes 34, 34 which oppose with a larger clearance than a diameter of the main winding rope 23 and a connection pipe 35 displaced between a connection position where each split pipe 34 is connected and a split position where each split pipe 34 is split. Consequently, when the swing lever 32 is removed from a tip side of a tower boom which is erected, the connection pipe 35 is displaced to the split position to ensure a clearance sufficient for the main winding rope 23 which passes therethrough between each split pipe 34 so that the swing lever 32 can be removed by avoiding the interference of the split connection member 33 and the main winding rope 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower crane which is suitably used, for example, for transporting materials to a high place at a construction site.

[0002]

2. Description of the Related Art In general, at construction sites such as high-rise buildings, tower cranes are usually used to carry materials from the ground to high places (for example, see Japanese Utility Model Application Laid-Open No. 60-85).
No. 589).

FIGS. 9 to 11 show such a conventional tower crane. In the drawings, reference numeral 1 denotes a lower traveling body, and 2 denotes a crane main body provided on the lower traveling body 1 so as to be pivotable. 1 shows an upper revolving structure, and an A-shaped frame 3 having a guide sheave 3A on the distal end side is provided on the upper revolving structure 2. In addition, the upper rotating body 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 is provided on the front portion of the upper swing body 2 so as to be able to undulate. The tower boom 7 has a rigid frame structure, and a tower jib 8 and a swing lever 9 to be described later are provided at its distal end. A support frame 7A for supporting the above is provided. The tower boom 7 stands up as shown in the figure by winding up and down an ups and downs rope 14 by an up and down drum 6, and supports the tower jib 8 in this state so as to be able to move up and down.

[0005] Reference numeral 8 denotes a tower jib provided on the support frame 7A of the tower boom 7 so as to be able to move up and down, and the tower jib 8 has a rigid frame structure. Then, the tower jib 8 is configured to wind up and down the below-described auxiliary rope 18 by the auxiliary winding drum 5 and to move up and down with respect to the tower boom 7.

Reference numeral 9 denotes a swing lever which is located near the tower jib 8 and is swingably attached to a support frame 7A of the tower boom 7. As shown in FIG. 7 support frame 7
A, a pair of frame members 10 and 11 provided to be swingable, and two connecting members 12 connecting the front ends of the frame members 10 and 11 to each other.
12 are formed in a triangular shape.

Here, the frame body 10 is made up of the left and right beam members 10.
A, 10A and a plurality of connecting members 10B, 10B,... Connecting the respective beam members 10A, and the base end side of each of the beam members 10A is supported by pins 13 as a swing center. 7A swingably supported. Also, the frame 11
Consists of left and right beam members 11A, 11A, and a plurality of connecting members 11B, 11B,.
The base end side of each beam 11A is the beam 10 constituting the frame 10.
A is pin-connected to the base end side.

Reference numeral 14 denotes an up-and-down rope wound at one end on the up-and-down drum 6. The other end of the up-and-down rope 14 is connected to the tower boom hanger 1 via the guide sheave 3A of the A-type frame 3.
5 and each of the sheaves (not shown) of the tower boom bridle 16 are sequentially wound and then hooked to the tower boom hanger 15. The tower boom bridle 16 and the support frame 7A of the tower boom 7 are connected by a pendant rope 17.

The hoisting rope 14 is wound and unwound by the hoisting drum 6, so that the tower boom hanger 15 and the tower boom bridle 16 approach and separate from each other.
The tower boom 7 is configured to undulate via a pendant rope 17.

Reference numeral 18 denotes an auxiliary rope wound on one end of the auxiliary drum 5. The other end of the auxiliary rope 18 is connected to each sheave of the tower jib hanger 19 and each of the sheaves of the tower jib bridle 20 (both in the figure). (Not shown), and is hung on a tower jib hanger 19. Here, the tower jib bridle 20 is a pendant rope 2
1 is connected to the front end side of each beam 10A of the frame 10 constituting the swing lever 9. The distal end of each beam 11A of the frame 11 constituting the swing lever 9 is connected to the distal end of the tower jib 8 via a pendant rope 22.

Then, the auxiliary rope 18 is wound and unwound by the auxiliary drum 5, so that the tower jib hanger 1
The 9 and the tower jib bridle 20 approach and separate from each other, and the swing lever 9 swings about the connecting portion (pin 13) of the tower boom 7 with the support frame 7A. The tower jib 8 moves up and down with respect to the tower boom 7 in response to the swing of the swing lever 9.

Reference numeral 23 denotes a main winding rope having one end wound around the main winding drum 4. The other end of the main winding rope 23 is connected to the tower jib 8.
Is wound around a hanging load hook 24 hanging down from the tip of the hook. When the main winding rope 23 is wound around the main winding drum 4, the hanging load hook 24 lifts the load.

The tower crane according to the prior art has the above-described configuration. When carrying out the lifting work using the tower crane, first, the hoisting rope 14 is wound by the hoisting drum 6 and the tower boom 7 is lifted. Stand up as shown.

Then, the auxiliary winding drum 1 is used by the auxiliary winding drum 5.
After winding and unwinding, the tip side of the tower jib 8 is moved to a desired height position, and then the main winding rope 23 is wound by the main winding drum 4 so that the hanging load hook 2
4 allows the luggage to be lifted to a high place.

When the above-mentioned tower crane is disassembled at the work site, as shown in FIG. 11, the tower jib 8 is folded toward the tower boom 7 and is connected to the tower boom 7 and the tower jib 8 by a connecting device (not shown). With the two connected, the tower boom 7 and the tower jib 8 are lowered to the ground side. Then, for example, the tower jib 8, the swing lever 9, and the like are removed from the tower boom 7, and then the tower boom 7 is removed from the upper swing body 2.

On the other hand, for example, in an urban area where the work space is small, when disassembling the tower crane at the work site, it may be difficult to lower the tower boom 7 or the like to the ground side. As shown in FIG. 11, with the tower boom 7 standing up, the swing lever 9 is removed from the tower boom 7 using another crane (not shown) or the like, and then the tower jib 8 or the like is removed from the tower boom 7. It is necessary to remove them sequentially.

[0017]

However, in the tower crane according to the prior art described above, the main winding rope 23 is guided by a guide sheave 25 provided on a support frame 7A of the tower boom 7 as shown in FIG. And
Each connecting member 10 constituting the frame 10 of the swing lever 9
B, among the connecting members 11B constituting the frame 11, when the connecting member 10B is located between the connecting members 10B and 11B located closest to the swing center (pin 13) of the swing lever 9, respectively, When removing the swing lever 9 with the tower boom 7 standing up, the connecting member 10 </ b> B located on the swing center side of the swing lever 9 interferes with the main winding rope 23.

For this reason, even if each pin 13 connecting the support frame 7A of the tower boom 7 and the swing lever 9 is removed, the swing lever 9 is moved to the tower boom 7
There is a problem that it is difficult to disassemble the tower crane smoothly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a tower crane in which a swing lever can be easily removed from a tower boom when performing a disassembling operation with the tower boom upright. It is intended to provide.

[0020]

In order to solve the above-mentioned problems, the present invention provides a crane body having a main winding drum,
A tower boom provided up and down on the crane body, a tower jib provided movably at the tip of the tower boom, and a pair of frames connecting left and right beam members with a plurality of connecting members. A swing lever, which is formed in a triangular shape by connecting the distal ends of these frames with a connecting body, and whose base end is swingably provided at the tip of the tower boom, and whose one end is the main winding drum The present invention is applied to a tower crane comprising a main winding rope attached to a hanging load hook whose other end side passes between connecting members of the swing lever and hangs from the tip of the tower jib.

A feature of the first aspect of the present invention is that, among the connecting members constituting the frame of the swing lever, the connecting member located on the swing center side of the swing lever with respect to the main winding rope,
In order to allow the main winding rope to pass through, it is configured as a split connecting member that can be split in the length direction.

With this configuration, for example, when the swing lever is removed from the tip end of the tower boom with the tower boom standing up, the split connecting member can be divided and passed through the main winding rope, The swing lever can be easily removed.

Further, according to a second aspect of the present invention, the split connecting material is
A pair of left and right shafts whose base end is fixed to the frame and whose front end faces with a gap larger than the diameter of the main winding rope, and a connecting member detachably provided on the front end of each shaft. I did it.

With this configuration, when the joining member is attached to the distal ends of the left and right shafts, the left and right shafts are integrated via the joining member to secure the strength of the split connecting member. can do. On the other hand, when the splicing member is removed from the distal ends of the left and right shafts, it is possible to secure a gap between the shafts for the main winding rope to pass through.

Further, according to a third aspect of the present invention, the joining member is
The joint pipe is slidably fitted on the outer peripheral side of each shaft body and is displaced between a connecting position for connecting the shaft bodies and a dividing position for dividing between the shaft bodies.

With this configuration, when the connecting pipe is displaced to the connecting position, the left and right shafts are integrated via the connecting pipe, and the strength of the split connecting member can be secured. On the other hand, when the joint pipe is displaced to the dividing position, a gap can be secured between the shafts for the main winding rope to pass through.

According to a fourth aspect of the present invention, the joining member is constituted by a joining plate whose one end is swingably supported by one of the shafts and the other end of which is detachably attached to the other of the shafts. It is in.

With this configuration, when the other end of the joint plate is attached to the other shaft, the left and right shafts are integrated via the joint plate to secure the strength of the split connecting member. be able to. On the other hand, when the other end side of the joint plate is detached from the other shaft body, it is possible to secure a gap between the respective shaft bodies for the main winding rope to pass through.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tower crane according to the present invention will be described below in detail with reference to FIGS.

First, FIGS. 1 to 6 show a first embodiment. In the present embodiment, the same components as those in the above-described prior art are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, reference numeral 31 denotes a tower crane according to the present embodiment. This tower crane 31 is, similarly to the prior art, a lower traveling unit 1 and an upper revolving unit 2 as a crane body having a main winding drum 4 and the like. A tower boom 7 provided on the upper swing body 2 so as to be able to undulate, a tower jib 8 provided on the tower boom 7 so as to be able to move up and down, and a swing lever 32 provided swingably on the tower boom 7;
One end of the main winding drum 4 is wound around the main winding drum 4, and the other end of the main winding drum 4 is attached to a hanging load hook 24 suspended from the tip end of the tower jib 8.

However, the tower crane 31 according to the present embodiment is different from the prior art in the configuration of the swing lever 32, and the swing lever 32 will be described below.

In FIG. 2, reference numeral 32 denotes a swing lever applied to the present embodiment in place of the swing lever 9 according to the prior art. The swing lever 32 includes a pair of frames 10, 11 and each of the frames 10, 11. 2 to connect the tip side of 11
The frame body 10 is formed into a triangular shape from the book connecting bodies 12, 12, and the frame body 10 includes left and right beam members 10 A, 10 A, and each beam member 10 A
. Are connected to each other.

However, in the present embodiment, of the plurality of connecting members 10B, the swing lever 3
2 in that one of them located on the side of the swing center (pin 13) is configured as a split connecting member 33 described later.

Reference numeral 33 denotes a connecting member 10B constituting the frame 10 of the swing lever 32 used in the present embodiment.
The split connecting member 33 is provided on the tower boom 7 (support frame 7A) side.
It is composed of a pair of right divided pipes 34 and a joint pipe 35.

Reference numerals 34, 34 denote left and right split pipes as shafts constituting the split connecting member 33, and each split pipe 3
As shown in FIGS. 3 to 5, the base 4 has a frame body 10 at the base end side.
Are fixed to the base end side of each beam member 10A by welding or the like, and the front end side faces with a gap D larger than the diameter d of the main winding rope 23. Two pin holes 34A, 34A, through which a connecting pin 36 described later is inserted, are formed in the distal end side of each divided pipe 34 so as to penetrate in the radial direction. Further, a plate-like stopper 34B that protrudes from the outer peripheral surface of each divided pipe 34 to regulate the sliding range of the joint pipe 35 is provided in a protruding manner.

Reference numeral 35 denotes a splicing pipe as a splicing member which is detachably provided at the distal end side of the left and right split pipes 34.
The connecting pipe 35 has an inner diameter that is larger than the outer diameter of the divided pipe 34, and is slidably fitted to the outer peripheral side of each divided pipe 34 to connect the divided pipes 34. It is displaced between a position (the position in FIG. 4) and a division position (the position in FIG. 5) for dividing between the respective divided pipes. The joint pipe 35 has four through holes 35.
A, 35A,... Are penetrated so as to penetrate in the radial direction.
4A.

Are connecting pins for connecting between the divided pipes 34 and the joint pipes 35.
6 is inserted into each through hole 35A of the joint pipe 35 and each pin hole 34A of each divided pipe 34 in a state where the joint pipe 35 is displaced to the connecting position shown in FIG. As a result,
The right split pipe 34 is integrated via a joint pipe 35 so that the strength of the split connecting member 33 can be ensured.

On the other hand, each connecting pin 36
5, the joint pipe 35 is displaced along the divided pipes 34 to the dividing position shown in FIG. 5, and the gap D is large enough for the main rope 23 to pass between the divided pipes 34.
Is ensured.

The tower crane 31 according to the present embodiment has the swing lever 32 configured as described above. When the tower crane 31 is used to carry a load, as shown in FIG. In a state displaced to the connection position, each through-hole 35A of the joint pipe 35,
A connecting pin 3 is inserted into each pin hole 34A of the left and right split pipes 34.
6 and the left and right split pipes 34 are integrated via the joint pipe 35, whereby the strength of the split connecting member 33 can be ensured.

Next, when the work of removing the swing lever 32 from the tip side of the tower boom 7 with the tower boom 7 standing up is performed, for example, as shown in FIG.
With the swing lever 32 supported by the hanging hooks 37 of the other cranes, the pendant ropes 21 and 22 are removed from the swing lever 32.

Then, as shown in FIG.
Each connecting pin 36 is removed from 5 and the joint pipe 35 is displaced to the dividing position. Thereby, a gap D that allows the main winding rope 23 to pass through can be secured between the divided pipes 34.

In this state, after the pin 13 connecting the swing lever 32 and the support frame 7A of the tower boom 7 is removed, the swing lever 32 in the direction of arrow A in FIG. Hoist. At this time, since the gap D is secured between the divided pipes 34 constituting the divided connecting member 33 of the swing lever 32 as described above, when the swing lever 32 is lifted, the main winding rope 23 is By going through D
Interference between the main winding rope 23 and the split connecting member 33 can be avoided.

Thus, even when the tower boom 7 is upright, the swing lever 32 can be removed from the tower boom 7, and even in a small work site where it is not possible to secure a space enough to tilt the tower boom 7 or the like to the ground side, the tower can be used. The disassembling operation of the crane 31 can be performed smoothly.

Next, FIGS. 7 and 8 show a second embodiment according to the present invention.
Is shown. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals,
The description is omitted.

In the drawing, reference numeral 41 denotes a splicing plate as a splicing member applied to the present embodiment in place of the splicing pipe 35 according to the first embodiment. Each of the plate members 42 is formed into an H shape from a pair of plate members 42, 42 facing each other across the radial direction, and a spacer 43 between the plate members 42 for securing a space slightly larger than the outer diameter of the divided pipe 34. Each divided pipe 34
4 with the pitch corresponding to the pin hole 34A
Are formed in the through holes 42A.

Reference numeral 44 denotes a support pin for swingably supporting the joint plate 41 with respect to one of the left and right divided pipes 34. The support pin 44 is one end in the longitudinal direction of the joint plate 41. One of the through holes 42A drilled on the side and one pin hole 34A drilled in one of the divided pipes 34 are inserted. Therefore, the joint plate 41 is supported by the support pins 44.
Is pivoted between the connection position shown in FIG. 7 and the division position shown in FIG.

45, 45,...
The connection pins 45 are provided on one end side of the joint plate 41 in a state where the joint plate 41 swings to the connecting position shown in FIG. One of the through holes 42A through which the support pin 44 is not inserted, and two through holes 4 formed at the other end of the joint plate 41.
2A and each pin hole 3 formed in the other divided pipe 34
4A. Thereby, the left and right split pipes 3
4 are integrated via a joint plate 41, so that the strength of the divided connecting member 33 can be ensured.

On the other hand, when each connecting pin 45 is removed from the joint plate 41, the joint plate 41 swings about the support pin 44 to the dividing position shown in FIG. The structure is such that a gap D enough for the main winding rope 23 to pass through can be secured.

The present embodiment has the above-described configuration. When carrying out the lifting work using the tower crane 31, as shown in FIG. 7, the joining plate 41 is fixed at the connecting position, and the joining plate 41 is fixed. By integrating the divided pipes 34 through each other, the strength of the divided connecting member 33 can be secured.

On the other hand, when the work of removing the swing lever 32 from the tip end of the tower boom 7 with the tower boom 7 standing up is performed, as shown in FIG. By displacing the joint plate 41 to the dividing position, the left and right divided pipes 3
4, a gap D enough to allow the main winding rope 23 to pass through can be secured, and similar to the first embodiment described above,
The swing lever 32 can be removed from the tower boom 7 without the main winding rope 23 and the split connecting member 33 interfering with each other.

In each of the above embodiments, the split connecting member 3
The left and right split pipes 34 and the joint pipes 35 constituting the third pipe 3
Although the case where the connection pipe 41 and the connection plate 41 are connected by the connection pin 36 (45) has been described as an example, the present invention is not limited to this. For example, each divided pipe 34 and the connection pipe 35 (connection plate 41) may be connected.

In each of the above embodiments, the undercarriage 1
The tower crane 31 having is described as an example,
The present invention is not limited to this, and can be applied to, for example, a fixed tower crane having no undercarriage or the like.

[0054]

As described above in detail, according to the first aspect of the present invention, of the connecting members forming the frame of the swing lever provided on the tip side of the tower boom, the swing lever is more than the main rope. Since the connecting member located on the rocking center side of the tower boom is configured as a split connecting member that can be split in the length direction to allow the main winding rope to pass through, for example, the tower boom When the swing lever is removed from the distal end side, the main winding rope can pass through the split connecting member. As a result, the main rope can be prevented from interfering with the connecting material of the swing lever, and the swing lever can be easily moved from the standing tower boom even in a small work site where there is not enough space for the tower boom or the like to fall to the ground side. The tower crane can be disassembled smoothly.

According to the second aspect of the present invention, the split connecting member includes a pair of left and right shafts whose base ends are fixed to the frame and whose front ends are opposed to each other with a gap larger than the diameter of the main winding rope. Since the connecting member is detachably provided at the distal end of each shaft, the left and right shafts are integrated via the connecting member when the connecting member is attached to the distal end of each shaft. It is possible to ensure the strength of the split connecting member during the hanging load operation. On the other hand, when the splicing member is removed from the distal end side of each shaft body, a gap can be secured between the left and right shaft bodies so that the main winding rope passes therethrough. When the swing lever is removed from the front end of the swing lever, it is possible to prevent the main winding rope from interfering with the connecting member of the swing lever.

Further, according to the third aspect of the present invention, since the joining member is constituted by the joining pipe slidably fitted to the outer peripheral side of each shaft body, each shaft is merely displaced to the connecting position. The body is integrated via the joint pipe, and the strength of the divided connecting member during the lifting operation can be ensured. On the other hand, just by displacing the joint pipe to the split position,
Since a gap enough for the main winding rope to pass through between the shaft bodies can be secured, the work of removing the swing lever from the standing tower boom can be easily performed.

According to the fourth aspect of the present invention, since the connecting member is constituted by a connecting plate whose one end is swingably supported by one of the shafts, the other end of the connecting plate is connected to each of the shafts. By simply attaching the shaft member to the other of the shaft members, the shaft members are integrated via the joint plate, and the strength of the divided connecting member during the lifting operation can be ensured. On the other hand, by simply removing the other end of the joint plate from the other shaft, it is possible to secure a gap between the shafts for the main winding rope to pass through, so the work of removing the swing lever from the standing tower boom It can be done easily.

[Brief description of the drawings]

FIG. 1 is an external view showing a tower crane to which a first embodiment of the present invention is applied.

FIG. 2 is an enlarged perspective view showing a swing lever in FIG. 1;

FIG. 3 is an enlarged view of a main part viewed from a direction indicated by arrows III-III, showing a split connecting member in FIG. 2;

FIG. 4 is a perspective view showing a state where the joint pipe in FIG. 3 is displaced to a connection position.

FIG. 5 is a perspective view showing a state where the joint pipe is displaced to a division position.

FIG. 6 is an enlarged external view showing a state in which a swing lever is removed from an upright tower boom.

FIG. 7 is a perspective view showing a state in which a joint plate according to a second embodiment of the present invention is rocked to a connection position.

FIG. 8 is a perspective view showing a state in which the joint plate is pivotally displaced to a dividing position.

FIG. 9 is an external view showing a conventional tower crane.

FIG. 10 is an enlarged perspective view showing a swing lever in FIG. 9;

FIG. 11 is an external view showing a state where the tower jib is folded toward the tower boom.

[Explanation of symbols]

 2 Upper Revolving Structure (Crane Body) 4 Main Winding Drum 7 Tower Boom 8 Tower Jib 10, 11 Frame 10A, 11A Beam 10B, 11B Connecting Material 23 Main Winding Rope 24 Suspended Hook 32 Swing Lever 33 Split Connecting Material 34 Split Pipe (Shaft) 35 Joint pipe (joint member) 41 Joint plate (joint member)

Claims (4)

[Claims] 1. A crane body having a main winding drum, a tower boom provided on the crane body so as to be able to move up and down, a tower jib provided on the tip end side of the tower boom so as to be able to move up and down, and left and right beams. A pair of frames in which the members are connected by a plurality of connecting members and the front ends of these frames are connected by a connecting body to form a triangular shape, and the base end of the frame swings toward the front end of the tower boom. A swing lever movably provided, one end of which is wound around the main winding drum, and the other end of which is attached to a hanging load hook which passes between connecting members of the swing lever and hangs down from a tip end of the tower jib. In a tower crane comprising a main winding rope, a connecting member located on the swing center side of the swing lever with respect to the main winding rope among the connecting members constituting a frame body of the swing lever, Tower crane characterized by being configured as a split connecting member made possible split lengthwise to allow the passing through the main winding ropes. 2. A pair of left and right shafts having a base end fixed to the frame and a front end opposed with a gap larger than the diameter of the main winding rope, and a tip end of each of the shafts. The tower crane according to claim 1, further comprising a connecting member detachably provided on the side. 3. The joint member is slidably fitted to an outer peripheral side of each of the shaft bodies, and is between a connecting position for connecting the shaft bodies and a dividing position for dividing the shaft bodies. 3. The tower crane according to claim 2, wherein the tower crane is constituted by a joint pipe displaced by: 4. The joint member is constituted by a joint plate having one end side swingably supported by one of the shaft bodies and the other end side detachably attached to the other of the shaft bodies. A tower crane as described in.