JPH10129985A - Catwalk device of crane boom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability when a crane boom is decomposed and assembled, by installing a footboard and a handrail to the crane boom easily, in the condition maintaining their interval adequately. SOLUTION: Plural brackets 33 are fixed to a footboard 32, a stay 34 is installed to a support tube 33C separating as an interval B in the width direction of the footboard 32, and by extending a rope 35 between the mooring rings 34A of the stay 34, the system is composed to maintain a specific interval A between the footboard 32 and the rope 35 constantly. Consequently, a complicated work to regulate the interval of the footboard 32 and the brackets can be made unnecessary, compared when the footboard 32 and the brackets are installed separately to an intermediate boom, for example. As a result, the time necessary for the installing work of a catwalk device 31 can be reduced, and the workability when the crane boom is decomposed and assembled can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane boom catwalk apparatus suitably used as a scaffold for disassembling and assembling a crane boom.

[0002]

2. Description of the Related Art Generally, at a construction site such as a high-rise building, a crane is used to transport materials between the ground and high places.

Therefore, a crawler type crane will be described with reference to FIGS. 5 to 8 as an example of this type of conventional crane. Reference numeral 1 denotes a lower traveling body, and 2 denotes a lower traveling body 1 capable of turning. 1 shows an upper revolving structure as a crane body provided, and an upper frame 2 is provided with an A-shaped frame 3 having a guide sheave 3A on a distal end side. The upper revolving unit 2 is provided with a main winding drum 4, a boom raising / lowering drum 5, and the like.

Reference numeral 6 denotes a crane boom provided at the front of the upper swing body 2 so as to be able to move up and down.
Is a lower boom 7 rotatably attached to a front portion of the upper revolving unit 2, and a lower boom 7 connected to the distal end side of the lower boom 7, for example.
.. And an upper boom 9 connected to the intermediate boom 8 on the distal end side of each of the intermediate booms 8, between the lower boom 7 and the intermediate boom 8,
, And between the intermediate boom 8 and the upper boom 9 are connected firmly by a connecting metal fitting 10, respectively. The crane boom 6 winds or unwinds a later-described boom hoisting rope 18 with the boom hoisting drum 5 to move up and down with respect to the upper rotating body 2.

[0005] Reference numeral 11 denotes a main winding rope wound around the main winding drum 4, and a hanging load hook 12 is attached to a tip side of the main winding rope 11. Then, the main winding rope 11 is wound around guide sheaves 13 and 14 rotatably arranged on the distal end side of the upper boom 9, and the suspended load hook 12 hangs downward from the guide sheave 14.

Reference numeral 15 denotes a boom support rope having one end attached to a tip end of the upper boom 9.
A bridle 16 having a plurality of sheaves (not shown) is attached to the other end. 17 is A type frame 3
2 shows a hanger attached to the upper end of the hanger, and the hanger 17 has a plurality of sheaves (not shown). A boom hoisting rope 18 wound around the boom hoisting drum 5 is wound between each sheave of the hanger 17 and each sheave of the bridle 16.

When the boom hoisting rope 18 is unwound from the boom hoisting drum 5, the bridle 16 moves away from the hanger 17 with the boom support rope 15, so that the crane boom 6 tilts downward. When the boom hoisting rope 18 is wound by the boom hoisting drum 5, the bridle 16 approaches the hanger 17 along with the boom support rope 15, and the crane boom 6 stands up.

When the above-mentioned cranes are transported to the work site, the crane boom 6 becomes long. Therefore, the crane boom 6 is individually disassembled into each of the intermediate booms 8 and the upper boom 9. Transported to the site, the individually transported intermediate boom 8 and upper boom 9 are assembled at the work site prior to crane operation.

The disassembling operation of the crane boom 6 will be described with reference to FIG. 6. First, the assembly of each intermediate boom 8 and the upper boom 9 is lifted by a small auxiliary crane (not shown). Then, the connecting fitting 10 between the lower boom 7 and the intermediate boom 8 is removed, and the assembly of each intermediate boom 8 and the upper boom 9 is grounded.

Next, by removing the connecting fitting 10 between the intermediate booms 8 and the connecting fitting 10 between the intermediate boom 8 and the upper boom 9, each intermediate boom 8 and the upper boom 9 are united. Decompose into

In this case, the work of removing the connecting fittings 10 located on the lower side in FIG. 6 can be performed on the ground, but the work of removing the connecting fittings 10 located on the upper side is performed by the intermediate boom 8. Need to do above.

For this reason, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-69585, a scaffold for removing the connecting fitting 10 on the intermediate boom 8 is shown in FIGS. Such a catwalk device is provided, and the catwalk device will be described below.

In the drawing, reference numeral 21 denotes a catwalk device provided on the intermediate boom 8, and the catwalk device 21 is provided with a tread plate 22 described later provided on the intermediate boom 8.
A plurality of brackets 24 provided near the tread plate 22 on the connecting pipe 8A of the intermediate boom 8; a plurality of stays 25 attached to each of the brackets 24; Rope 27.

Reference numeral 22 denotes a tread plate provided on the intermediate boom 8 so as to extend in the length direction thereof. As shown in FIG. 8, the tread plate 22 has an outer frame having a U-shaped cross section. 22A and a reinforcing plate 22B welded to the inner center of the outer frame 22A. The tread plate 22 is disposed so as to bridge between the connecting pipes 8A, 8A before and after the intermediate boom 8 is connected, and is connected to a mounting member 23 bolted to the lower surface of the outer frame 22A. It is fixed so as to sandwich the pipe 8A.

Are three brackets located near the tread plate 22 and detachably attached to the connecting pipe 8A or the like of the intermediate boom 8. Each of the brackets 24 extends in the longitudinal direction of the tread plate 22. Each stay 25
Is supported at the lower end side.

Reference numerals 25, 25,... Denote three stays attached to each bracket 24. Each of the stays 25 has pin holes 25A, 25B formed at two locations in the axial direction, and the pin holes 25A or 25B. Pin 26 via the bracket 24
Is positioned at the assembly position indicated by the solid line or the storage position indicated by the two-dot chain line. An anchoring ring 25 </ b> C for anchoring the rope 27 is provided on the protruding end side of each stay 25.

Reference numeral 27 denotes a rope as a handrail stretched between the anchoring rings 25C of the stays 25. The rope 27 extends along the length of the tread plate 22. And
The rope 27 secures the safety of the work on the tread plate 22 by being gripped by a worker who removes the connection fitting 10 on the tread plate 22 or by hooking a lifeline (not shown). Is what you do.

Catwalk device 21 according to the prior art
When disassembling each of the connected intermediate booms 8, the worker walks on the tread plate 22 while holding the rope 27, removes the connection fitting 10, and removes each of the intermediate booms 8. Is working on disassembly.

[0019]

By the way, in order for the worker to walk safely on the tread plate 22 while gripping the rope 27, a predetermined distance A is set between the tread plate 22 and the rope 27.
However, in the above-described catwalk device 21 according to the related art, the bracket 24 and the tread plate 22 to which the stay 25 for attaching the rope 27 is attached are individually attached to the intermediate boom 8. It is configured to be attached.

Therefore, when the bracket 24 is attached to the intermediate boom 8 to stretch the rope 27, the center of the tread plate 22 previously attached to the intermediate boom 8 and the anchoring ring 25C of the stay 25 attached to the bracket 24 The mounting position of each bracket 24 must be adjusted so that the distance A is maintained. As a result, a large amount of time is required for attaching the catwalk device 21 to the intermediate boom 8, and there is a problem that the workability during disassembly and assembly of the crane boom 6 is greatly reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and can be easily attached to a crane boom while maintaining a proper distance between a tread plate and a handrail.
It is an object of the present invention to provide a crane boom catwalk device that can improve workability during disassembly and assembly of the crane boom.

[0022]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a step plate attached to a crane boom, a fixing portion fixed to the step plate, and a stay provided at an end thereof. A bracket with a support,
The stay support portion is provided detachably, and includes a stay that projects outside the crane boom at the time of attachment, and a handrail extending along the length direction of the tread plate between projecting ends of the stays, A plurality of stay support portions of the bracket are provided at a predetermined distance from the tread plate and spaced apart in a length direction of the tread plate.

According to the above arrangement, the plurality of brackets fixed to the tread plate so as to be spaced apart from each other in the longitudinal direction thereof are provided with the stay support portions at the ends thereof at predetermined intervals from the tread plate. Attach a stay to the stay support,
By providing a handrail between the protruding ends of the stays, it is possible to easily attach the stay to the crane boom while maintaining an appropriate distance between the tread plate and the handrail.

Further, the invention according to claim 2 is characterized in that each of the stays is attached to each of the brackets while being inclined with respect to the vertical direction.

According to the above configuration, each stay is attached to each bracket by being inclined with respect to the vertical direction.
An appropriate gap can be secured between the handrail provided between the projecting ends of the stays and the tread plate.

Further, the invention according to claim 3 is a step plate attached to a crane boom, a plurality of brackets fixed to the step plate at a distance in a length direction thereof, and detachably attached to each of the brackets, A plurality of stays projecting to the outside of the crane boom at the time of mounting and inclined with respect to the vertical direction, and handrails provided between projecting ends of the stays and extending along the length direction of the tread plate. And that it consists of

According to the above arrangement, since the stays are attached to the brackets fixed to the tread plate so that the stays are disposed in a state inclined with respect to the vertical direction, the distance between the projecting ends of the stays is reduced. An appropriate interval can be secured between the provided handrail and the tread plate.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a catwalk device applied to the present embodiment in place of the catwalk device 21 according to the prior art, and the catwalk device 31 has an intermediate boom as in the catwalk device 21 according to the prior art. 8, a plurality of brackets 33, a plurality of brackets 33, a plurality of stays 34 attached to the brackets 33, and a rope 35 stretched between the stays 34. Each bracket 33
However, the difference is that they are integrally fixed to the tread plate 32.

Numeral 32 denotes a tread plate provided on the intermediate boom 8 so as to extend in the length direction thereof. The tread plate 32 has an outer frame 32A having a U-shaped cross section and an outer frame 32A.
A reinforcing plate 32B is welded to the inner central portion of 2A, and three notches 32C, 32C,... Are formed on one side surface of the outer frame 32A so as to be separated in the length direction.

The tread plate 32 is provided so as to bridge between the connecting pipes 8A and 8A before and after the intermediate boom 8 is formed, and is connected to the mounting member 23 bolted to the lower surface of the outer frame 32A. It is fixed so as to sandwich the connecting pipe 8A between them.

Are three brackets which are integrally fixed to the tread plate 32 so as to be spaced apart from each other in the longitudinal direction thereof. Each of the brackets 33 is, as shown in FIG. Is welded to the footboard 3 from the notch 32C.
2, a mounting plate portion 33A as a fixing portion in the form of a triangular plate protruding in the width direction, and a bottomed cylindrical shape fixed to the protruding end of the mounting plate portion 33A and having a stay fitting hole 33B on the inner peripheral side. And a support cylinder portion 33C as a stay support portion.

Here, the support cylinder portion 33C of the bracket 33
Is arranged at a position separated by a predetermined interval B in the width direction of the tread plate 32, and the central axis CC of the stay fitting hole 33B is inclined by an inclination angle θ (for example, 5 degrees) with respect to the vertical direction. It has become.

The interval B is equal to the outer frame 3 of the tread plate 32.
Stay fitting hole 33B provided in 2A end face and bracket 33
Is set as the distance from the center of the open end of the image.

.. Are three stays supported by the support tubular portion 33C of each bracket 33 and protruding outside the intermediate boom 8. A staying ring 34A is fixed to the projecting end side of each stay 34. Have been. And each stay 34
Is the lower end side of the bracket 33 with a stay fitting hole 33B.
By fitting into the vertical direction, it extends upward while being inclined with respect to the vertical direction.

Here, the length of the stay 34 (from 900 mm to
1000 mm) and the above-described inclination angle θ, the separation distance between the center of the anchoring ring 34A of the stay 34 and the tread plate 32,
It is set in advance so as to have an appropriate interval A as in the conventional technique. Therefore, the upper end side of the stay 34 (the anchor ring 3
4A) is enlarged by a dimension D from the center of the stay fitting hole 33B of the bracket 33.

It is to be noted that the distance between the center of the anchoring ring 34A of the stay 34 and the tread plate 32 is within a range in which a proper distance A can be secured.
C, and the inclination angle θ of the stay fitting hole 33B provided in the support cylinder portion 33C can be variously changed. For example, the inclination angle θ of the stay fitting hole 33B is set to be large,
A configuration may be adopted in which the distance B between the support cylinder portion 33C and the tread plate 32 is set smaller by that amount.

Reference numeral 35 denotes a rope as a handrail stretched between the anchoring rings 34A of the stays 34. The rope 35 holds the above-mentioned interval A between the stepping plate 32 and
The step plate 32 is provided to extend in the length direction.

The catwalk device 3 according to the present embodiment
Reference numeral 1 has the above-described configuration. Hereinafter, an operation of attaching the catwalk device 31 to the intermediate boom 8 will be described.

First, the tread plate 32 is arranged so as to bridge between the connecting pipes 8A, 8A in front of and behind the intermediate boom 8, and the fittings 23 are attached to the lower surface of the tread plate 32 so as to sandwich each connecting pipe 8A from above and below. By bolting
The tread plate 32 is fixed to the upper surface of the intermediate boom 8. Note that the tread plate 32 may be fixed to the upper surface of the intermediate boom 8 at all times.

After the lower ends of the stays 34 are fitted into the stay fitting holes 33B of the brackets 33 integrally fixed to the tread plate 32, between the anchoring rings 34A provided on the protruding end sides of the stays 34. A rope 35 is stretched.

At this time, the support cylinder 3 of each bracket 33
3C is provided at a distance B in the width direction of the tread plate 32 and is inclined at an angle θ with respect to the vertical direction.
The stay 34 fitted in the stay fitting hole 33B of the support tubular portion 33C protrudes upward at a predetermined inclination angle θ with respect to the vertical direction, so that an appropriate distance is provided between the center of the anchoring ring 34A and the tread plate 32. The interval A can be secured. Accordingly, the rope 35 can be easily positioned at a position separated from the tread plate 32 by the interval A by stretching the rope 35 between the mooring rings 34A.

Thus, according to the catwalk device 31 of this embodiment, each bracket 33 is attached to the tread plate 32.
By integrally fixing the brackets to each other, it is possible to obviate the need for a complicated operation such as attaching the plurality of brackets 24 to the intermediate boom 8 while adjusting the interval with the tread plate 22, as in the catwalk device 21 according to the related art. Thereby, the time required for the work of attaching the catwalk 31 can be reduced, and the workability during disassembly and assembly of the crane boom 6 can be greatly improved.

Further, by protruding the stay 34 upward at a predetermined inclination angle θ with respect to the vertical direction,
Since the distance of the dimension D can be maintained between the stay fitting hole 33B of the bracket 33 and the anchoring ring 34A of the stay 34, the degree of freedom when the worker walking on the tread plate 32 grips the rope 35 is increased, Safety when walking on the tread plate 32 can be further improved.

In the above embodiment, the bracket 33
The support cylinder 33C is inclined and the stay 34 attached to the support cylinder 33C is inclined with respect to the vertical direction, so that the center of the anchoring ring 34A of the stay 34 and the tread plate 3
Although the configuration is such that the interval with the second 2 is an appropriate interval A, it may be configured, for example, as in a modification shown in FIG.

That is, the mounting plate portion 4 fixed to the tread plate 32
1A and a support cylinder 41C fixed to the protruding end of the mounting plate 41A and having a stay fitting hole 41B on the inner periphery side. The support cylinder 41A is positioned at a distance A from the tread plate 32. By using the bracket 41 provided upright and attaching the stay 34 to the support cylinder portion 41C of the bracket 41, the stay 34 may extend in the vertical direction while maintaining the interval A with the tread plate 32. Good.
In this case, the tread plate 32 and the support tubular portion 41 of the bracket 41
The distance B from C is the same as the distance A.

Further, in the above-described embodiment, the case where the catwalk device 31 is attached to the intermediate boom 8 has been described as an example. However, the present invention is not limited to this. Can be installed.

Further, in the above embodiment, the case where the rope 35 is used as the handrail is taken as an example. However, the present invention is not limited to this, and a rod-shaped body such as a metal pipe may be used.

[0049]

As described in detail above, according to the first aspect of the present invention, a stay is attached to the stay supporting portion of each bracket fixed to the tread plate, and a handrail is provided between the protruding ends of each stay. Because it was configured to be able to maintain an appropriate distance between the tread and the handrail, compared to, for example, individually mounting the tread and each bracket on the crane boom,
This eliminates the need for a complicated operation for adjusting the distance between the step board and each bracket. As a result, the time required for attaching the catwalk can be reduced, and the workability during disassembly and assembly of the crane boom can be greatly improved. Moreover, the number of components can be reduced by integrally fixing each bracket to the tread plate.

According to the second aspect of the present invention, since each stay is attached to each bracket while being inclined with respect to the vertical direction, a handrail is provided between the protruding ends of each stay, so that the hand is provided. It is possible to secure a suitable space between the slide and the tread plate for a worker walking on the tread plate to grip.

Further, according to the third aspect of the present invention, since the stay is attached to each bracket fixed to the tread plate, each stay is disposed in a state inclined with respect to the vertical direction. An appropriate interval can be secured between the handrail provided between the protruding ends of the stays and the tread plate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a catwalk device according to an embodiment of the present invention attached to a crane boom.

FIG. 2 is an exploded perspective view showing a step board, a bracket, and a stay in FIG.

FIG. 3 is a cross-sectional view as seen from the direction of arrows III-III in FIG.

FIG. 4 is a cross-sectional view showing a modification of the present invention at the same position as in FIG. 3;

FIG. 5 is an external view showing a crawler type crane provided with a crane boom provided with a catwalk device according to the related art.

FIG. 6 is an explanatory view showing a state in which the crane boom in FIG. 5 is disassembled.

FIG. 7 is a perspective view showing a state in which a conventional catwalk device is attached to an intermediate boom.

FIG. 8 is a cross-sectional view as seen from the direction of arrows VIII-VIII in FIG.

[Explanation of symbols]

 2 Upper revolving unit (crane body) 6 Crane boom 31 Catwalk device 32 Tread plate 33, 41 Bracket 33A Mounting plate portion (fixed portion) 33C Support tube portion (stay support portion) 34 Stay 35 Rope (handrail)

Claims (3)

[Claims] A bracket provided with a step plate attached to the crane boom, a fixing portion fixed to the step plate, and a stay support portion provided at an end of the step plate; and a bracket provided detachably on the stay support portion. A stay that protrudes to the outside of the crane boom at the time of attachment, and a handrail extending along the length direction of the tread plate between the protruding ends of each of the stays, the stay support portion of the bracket is provided from the tread plate. A catwalk device for a crane boom having a configuration in which a plurality of treads are provided at predetermined intervals in the length direction of the tread plate. 2. The catwalk device for a crane boom according to claim 1, wherein each of the stays is attached to each of the brackets while being inclined with respect to a vertical direction. 3. A step board attached to a crane boom, a plurality of brackets fixed to the step board at a distance in a longitudinal direction thereof, and detachably attached to each of the brackets. A crane comprising a plurality of stays projecting outside and inclined with respect to the vertical direction, and handrails provided between the projecting ends of the stays and extending along the length direction of the tread plate. Boom catwalk equipment.