JP2002046981A - Laying method for disassembly and assembly of tower and tower jib for mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of an equipment body and improve operational safety in a latticed tower crane by ensuring laying for disassembly and assembly of a tower and a tower jib of a structure wherein the tower is shorter than the tower jib. SOLUTION: A latticed tower crane 11 has fixed post-to-post distance type posts 9 arranged on the top of a tower 4 to derrick a tower jib 5. The tower jib 5 has at the tip a roller 12 for sliding the tip on the ground when the tip is grounded. For the laying of the tower 4 and the tower jib 5 for disassembly and assembly from a working attitude (S10), the tip of the tower jib 5 is first lowered (S11) to ground the roller 12 (S12), and next the roller 12 is slid along the ground to incline the tower 4 down (S13) while increasing the angle that the tower 4 and the tower jib 5 form, until the tower 4 and the tower jib 5 are laid in a substantially series relation on the ground G (S14), in which laying state the tower 4 and the tower jib 5 are disassembled and assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower for a mobile crane and a method for dismounting and disassembling a tower jib, and more particularly, to a lattice having a fixed post-to-post distance fixing post on a tower top. In a tower crane, the tower and tower jib can be dismantled and dismantled in a configuration in which the tower length is shorter than the tower jib length. The present invention relates to a lodging method for assembly.

[0002]

2. Description of the Related Art A conventional mobile tower crane of this type will be described with reference to FIGS. In FIG. 3, reference numeral 1 denotes a lattice tower crane. The lattice tower crane 1 has a tower 4 mounted on a lower traveling body 2 at the front of an upper revolving structure 3 so as to be able to move up and down. A tower jib 5 is pivotally attached to the top of the tower 4 so as to be able to move up and down. The longitudinal dimension of the tower 4 is formed longer than the longitudinal dimension of the tower jib 5 in accordance with disassembly and assembly operations described later.

[0003] A hook 6 is provided at the tip of the tower jib 5.
Is suspended, and the hook 6 is raised and lowered by lifting and lowering the hook rope 7. Further, the undulating angle of the tower 4 is changed by hoisting and lowering the tower hoisting rope 8, and the elevating angle of the tower jib 5 is wrapped around a fixed post-to-post distance type post 9 provided at the top of the tower 4. The jib hoisting rope 10 is configured to be changed by winding up and down.

When the tower 4 and the tower jib 5 are to be laid down from the working posture (S1) for disassembly and assembly, first, the jib hoisting rope 10 is lowered and the tip of the tower jib 5 is lowered. It is lowered (S2), and the tower jib 5 is suspended from the top of the tower 4 and held by the tower 4 (S3).
Is held down, the tower hoisting rope 8 is lowered to lower the tower 4 (S4). The tower 4 and the tower jib 5 can be disassembled and assembled in this laid state.

However, in the lattice type tower crane 1, as described above, since the longitudinal dimension of the tower 4 is formed longer than the longitudinal dimension of the tower jib 5 in accordance with dismantling and assembling work, the tower 5 is formed. As a result, the weight of the tower 5 increases, and therefore, the performance of the lattice tower crane 1 also decreases. As the performance decreases, a large and high performance lattice tower crane is required.

As shown in FIG. 4 (a), in the work system in which the tower 4 of the lattice tower crane 1 is set up in a substantially vertical state to perform the work, as described above, the tower 4 Since the length is determined by the length of the tower jib 5, the height may be increased irrespective of the height H of the work range S, and the tower 4 thus raised is susceptible to building wind or the like. There was a problem with safety.

Further, as shown in FIG. 4 (b), in the work system in which the tower 4 of the lattice tower crane 1 is tilted and the work is performed in accordance with the height H of the work range S, the tower 4 is used. Is less affected by building winds, etc., but the working radius R is longer,
Due to the long working radius R, the stability of the fuselage deteriorates, and there is a problem in safety.

Therefore, in a lattice tower crane,
A technical problem to be solved in order to enable the tower and the tower jib to be disassembled and disassembled with a configuration in which the tower length is shorter than the tower jib length, to reduce the size of the fuselage, and to make the work safer. The present invention aims to solve this problem.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object, and is directed to a lattice tower crane having a fixed post-to-post fixed post for raising and lowering a tower jib at the top of the tower. Sliding means is provided at the tip of the tower jib for sliding the tip on the ground surface when the tip is in contact with the ground, and when the tower and the tower jib are turned down for disassembly and assembly from a working posture, Lowering the tip of the sliding means to touch the ground, and then sliding the sliding means along the ground surface, thereby tilting the tower while increasing the angle formed between the tower and the tower jib, A tower of a mobile crane for laying the tower and the tower jib on the ground surface in a substantially serial manner and a method of dismounting and assembling the tower jib, and
A method for dismounting and disassembling the tower and tower jib of a mobile crane, wherein the sliding means is a rolling wheel, and a method for dismounting and disassembling and assembling the tower and tower jib of a mobile crane, wherein the sliding means is a sliding plate. Is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of description, the same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, reference numeral 11 denotes a lattice tower crane. The lattice tower crane 11 is a rolling wheel as a sliding means that slides the tip on the ground surface G at the tip of the tower jib 5 when the tip touches the ground. 12 are provided.
Note that a sliding plate (not shown) may be provided instead of the wheel 12.

When the tower 4 and the tower jib 5 are to be laid down for assembling and disassembling from the working posture (S10), the jib hoisting rope 10 is first lowered, and the tip of the tower jib 5 is lowered. (S11) The rolling wheel 12 is grounded (S12), and then the tower hoisting rope 8 is lowered to roll the rolling wheel 12 along the ground surface, and further, the tower 4 and the tower jib 5 Tilting the tower 4 while increasing the angle formed by (S13),
The tower 4 and the tower jib 5 are laid down on the ground surface in substantially series (S14). Then, the tower 4 in the lying state
And disassembly and assembly of the tower jib 5.

When raising the tower 4 and the tower jib 5 after the assembly is completed, first,
When the tower 4 is raised from the lying state (S14) by hoisting the tower hoisting rope 8, the tip of the tower jib 5 is pulled toward the tower 4 while rolling the rolling wheels 12 on the ground surface G. When the tip of the tower jib 5 is sufficiently drawn toward the tower 4 (S12), the tip of the tower jib 5 is raised by winding up the jib hoisting rope 10 (S11), and the tower jib is raised. 5 is raised to the working position (S10). In addition, when the sliding plate is used, the tower 4 and the tower jib 5 can be lowered and raised in the same manner.

Thus, the lattice tower crane 1
1 allows the tower 4 and the tower jib 5 to be disassembled and assembled so that the tower 4 and the tower jib 5 can be laid down and raised smoothly, and furthermore, the tower 4 of the lattice tower crane 11 , The length of the tower 4 in the longitudinal direction can be shorter than the length of the tower jib 5, whereby the weight of the tower 4 can be reduced and the lattice type Since the performance of the tower crane 11 is also improved, the lattice tower crane 11 can be downsized. This can also reduce transportation costs.

Further, as shown in FIG. 2, in a work system in which the tower 4 of the lattice type tower crane 11 is erected in a substantially vertical state and work is performed, Since the height of 4 is not unnecessarily high, there is no influence from the building wind or the like, and the working radius R does not become unnecessarily long with respect to the working range S, so that the safety is extremely high. Become.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0016]

As described in detail in the above embodiment, the present invention according to claim 1 is a lattice type tower crane, wherein the tip of the tower jib is grounded when the tip is grounded. When the tower and the tower jib are laid down for disassembly / assembly from the working position, first, the tip of the tower jib is lowered to ground the sliding means, and then the sliding means is provided. By sliding along the ground surface, the tower is tilted while enlarging the angle formed by the tower and the tower jib, so that the tower and the tower jib are laid down on the ground surface in a substantially serial manner, Since the tower does not need to hold the tower jib, the longitudinal length of the tower can be less than the longitudinal length of the tower jib,
Since the weight of the tower can be reduced and the performance of the lattice tower crane improves, the size of the lattice tower crane can be reduced.

Further, since the tower can be lowered, there is no influence of building wind or the like, and the working radius with respect to the working range does not become long, so that the safety becomes extremely high.

Further, according to the second aspect of the present invention, the same effect as the first aspect of the invention can be expected by providing a rolling wheel as the sliding means.

Further, according to the third aspect of the invention, the same effect as the first aspect of the invention can be expected by providing a sliding plate as the sliding means.

Thus, the present invention provides a lattice type tower crane in which the tower length is shorter than the tower jib length so that the tower and the tower jib can be dismantled and assembled for downsizing. This is an invention that has a truly remarkable effect, for example, it is possible to achieve a safe operation.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of the present invention and showing a method of lowering a tower of a lattice type tower crane.

FIG. 2 shows an embodiment of the present invention, and is an explanatory view showing a lattice type tower crane and an operation range thereof.

FIG. 3 is an explanatory view showing a conventional example and showing a method of lowering the tower of a lattice tower crane.

FIG. 4 is an explanatory view showing a conventional example, showing a lattice type tower crane and its working range.

[Explanation of symbols]

 4 Tower 5 Tower jib 9 Post fixed distance type post 11 Lattice type tower crane 12 Roller wheel G Ground surface

Claims (3)

[Claims] 1. A lattice tower crane in which a fixed post between towers for raising and lowering a tower jib is disposed at the top of a tower, the tip of the tower jib is slid on the ground surface when the tip is in contact with the ground. Providing a sliding means, when lowering the tower and the tower jib for disassembly and assembly from the working position, first lower the tip of the tower jib to ground the sliding means, then, By sliding along the ground surface, the tower is tilted while enlarging the angle formed by the tower and the tower jib, and the tower and the tower jib are laid down on the ground surface in a substantially serial manner. For crane tower and tower jib disassembly / assembly. 2. The method according to claim 1, wherein said sliding means is a rolling wheel. 3. The method according to claim 1, wherein said sliding means is a slide plate.