JP2000272876A - Folding jib crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a size of a crane for dismounting and to prevent the interference in revolving by mounting a hinge on the approximately central part of a jib of a jib crane and upwardly folding the jib. SOLUTION: A jib 8 is divided into a basic side 8b and a point side 8c on a folding part 8a as the boundary approximately at a center. The folding part 8a is formed by connecting an upper member of the jib 8 by a hinge 10, and connecting a lower member with a flange 11 by a bolt 12, and the jib 8 is upwardly folded. The flange 11 may be connected by a pin, which is put in and out. According to this construction, as the jib 8 is folded to be minimized, a light crane of small capacity for disjoining can be used, and further a disjoining period can be shortened. As the revolving radius can be reduced, an adjacent crane can be simultaneously revolved, and the countermeasure to a storm can be easily taken.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding jib crane in which a jib of a jib crane is folded upward or sideways.

[0002]

2. Description of the Related Art FIG. 1 shows a climbing crane as a typical jib crane. Climbing cranes are cranes that are often used in constructions such as buildings, and are cranes that can be moved up to the upper floor by themselves according to the construction of the building. The foundation 1 is attached to a beam or the like of a building, and the support 2 is attached to the foundation 1. A turning portion 3 is attached to the top of the support 2, and an inverted V-shaped frame 4 is attached on the turning portion 3. A counter frame 5 is provided at a rear portion of the turning portion 3, and an undulating winch 6 and a hoisting winch 7 are provided on the counterweight portion 5. A jib 8 is attached to the base of the inverted V-shaped frame 4 of the revolving portion 3, and the jib 8 is
And the lifting device 9 is lifted and lowered by the hoisting winch 7 to lift and lower the load.

[0003]

When a jib crane is dismantled, a crane smaller than itself is assembled with the jib crane and disassembled using the jib crane.
Since the thing of about 50 m is common, the small crane has become quite large, and the dismantling of this small crane has been a considerable work. In addition, the jib crane measures against storms so that the jib can be turned freely so that the jib does not turn against the wind direction. However, on construction sites such as buildings,
In many cases, two or more cranes are provided adjacent to each other, and if they are turned in the wind, they will interfere with each other. Even in the case of one unit, there is a case where it interferes with a fixed object. In such a case, the jib is tied to a building or the like so as not to be able to make a turn. However, this tying work and the work of restoring the jib after passing through the storm require a considerable amount of work and time.

[0004] The present invention has been made in view of such problems, and an object of the present invention is to provide a foldable jib crane that requires only a small crane for dismantling and has little interference even when turning.

[0005]

According to the first aspect of the present invention, a hinge is provided at a substantially central portion of a jib of a jib crane so that the jib can be folded upward.

By turning the jib upward and folding it,
Since the length of the jib can be reduced to about half, the crane for dismantling is also small. In addition, since the turning radius becomes smaller, even if there is a crane adjacent to the crane, both the cranes can be turned, and measures against a storm can be simplified.

According to the second aspect of the present invention, the vicinity of the hinge on the base side of the jib is supported by a wire, and the distal end on the distal end side is folded by using an up-and-down device.

Since the jib is bent by the hinge, the jib can be turned upward and folded by winding the jib tip up and down with a winch.

According to the third aspect of the present invention, the jib of the jib crane is provided with a hinge that can be folded laterally at a substantially central portion of the jib so that the jib can be folded laterally.

When the jib is structured to be folded laterally,
At the time of dismantling, when dismantling with the dismantling crane, by dismantling after folding the jib sideways with this dismantling crane,
This dismantling crane can be made small.

According to the invention of claim 4, the jib of the jib crane is folded laterally by another crane provided near the jib.

To fold the jib laterally, it can be folded with a crane built for demolition.

According to the fifth aspect of the present invention, a hinge is provided substantially at the center of the jib of the jib crane so that the jib can be folded downward.

By turning the jib downward and folding it,
Since the length of the jib can be reduced to about half, the crane for dismantling is also small. In addition, since the turning radius becomes smaller, even if there is a crane adjacent to the crane, both the cranes can be turned, and measures against a storm can be simplified.

In the invention according to claim 6, the vicinity of the hinge at the base side of the jib is supported by a wire, and the tip on the tip side is loosened by an up-and-down device to be folded.

Since the jib is bent by the hinge, the jib can be turned downward by folding the jib tip down with an up / down winch.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a jib crane according to the present embodiment. The description of FIG. FIG. 2 is a detailed view of the structure of the jib that folds upward and the folded portion. The jib 8 is divided into a root side 8b and a tip side 8c with a folded portion 8a provided substantially at the center as a boundary. In the folded portion 8a, the upper member of the jib 8 is connected with a hinge 10 and the lower member is connected with a flange 11 with a bolt 12. In addition, you may make it connect and remove a pin by making the flange 11 into a pin connection.

Next, the upward folding operation will be described with reference to FIGS. FIG. 3 shows the state before folding starts. FIG. 4 shows a state in which a root-side support wire 13 is tied to the vicinity of the flange 11 on the root side 8b of the jib 8 and the root side 8b is fixed at the tip of the inverted V-shaped frame 4. FIG. 5 shows the details of the folded portion 8a. After fixing the root side 8b with the root side support wire 13, the bolt 12 connecting the flange 11 is removed. FIG. 6 shows a case in which the jig 8
Is shown folded. Since the jib 8 is provided with a maintenance passage from the root to the tip, attachment of the root-side support wire 13 and removal of the bolt 12 of the flange 11 are easily performed.

Next, the disassembly of the jib crane will be described. The jib crane is dismantled by building a small crane having a smaller jib length and lifting capacity than the jib crane. For the dismantling of this small crane, a crane one size smaller than this is built with a small crane, and this operation is sequentially repeated, carried by manpower and the elevator of the building, and dismantled. If the small crane can be dismantled manually by weight, it is carried by manpower and the elevator of the building and dismantled. FIG. 7 shows a small crane built near the jib crane. The capacity of the small crane is determined according to the jib length of the jib crane. FIG.
Indicates the size of the working radius of the small crane determined according to the jib length of the jib crane. (A) shows that a small crane with a large working radius is required when the jib is not folded, and (B) shows that a small crane with a small working radius is sufficient when the jib is folded. When the jib is folded and reduced in this way, a small crane for dismantling can be of a small capacity, and the dismantling period can be shortened.

Next, an embodiment in which the jib is folded in the horizontal direction will be described. Fig. 9 is a plan view of jib crane and jib 8
2 shows details of the folded portion 8a. One of the right and left sides of the jib 8 is connected by a hinge 10, and the other is connected to the flange 11 and the bolt 1.
Connect with 2. Folding is done with a small crane built for dismantling. FIG. 10 shows a state where the jib 8 is folded in the horizontal direction. In the case of folding in the lateral direction in this manner, similarly to the case of folding in the upward direction, the small crane for dismantling requires only a small capacity, and the dismantling period is further shortened.

Next, an embodiment in which the jib is folded downward will be described. FIG. 11 shows a side view of the jib crane and details of the folded portion 8a of the jib 8. The jib 8 is divided into a root side 8b and a tip side 8c with a folded portion 8a provided substantially at the center as a boundary. In the folded portion 8a, the lower member of the jib 8 is connected with a hinge 10 and the upper member is connected with a flange 11 with a bolt 12. In addition, you may make it connect and remove a pin by making the flange 11 into a pin connection. FIG. 12 shows a state in which the undulation winch 6 is rolled down,
Is shown folded down. The leading end 8c is attracted to the base side 8b by a wire from the base side 8b, and both are fixed by the fixing hardware 14. In the case of folding downward as described above, similarly to the case of folding upward, the small crane for dismantling requires only a small capacity, and the dismantling period is further shortened.

[0022]

As described above, the present invention has the following effects by employing a structure in which the jib of a jib crane is folded. The capacity of the small crane built when dismantling the jib can be reduced, and the dismantling period can be shortened. In order to prevent a wind storm when a plurality of jib cranes are built in proximity to each other to perform work, the jib of the crane which may interfere when the jib can be turned freely against the wind is folded. As a result,
Keeping the jib free makes it extremely easy to control storms. The folded jib can be restored using an unfolded crane.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a jib crane according to an embodiment.

FIG. 2 is a diagram showing a configuration of a jib and details of a folding section.

FIG. 3 is a diagram illustrating a state before folding the jib crane.

FIG. 4 is a view showing a state in which a root-side support wire is attached to a jib.

FIG. 5 is a diagram showing details of a folding unit.

FIG. 6 is a diagram showing a state in which it is folded upward.

FIG. 7 is a view showing a state in which a small crane for demolition is erected near a jib crane.

FIG. 8 is a view for explaining that the capacity of the small crane for dismantling changes according to the length of the jib.

FIG. 9 is a plan view of a jib crane that folds in a lateral direction.

FIG. 10 is a diagram showing a state of a jib folded in a lateral direction.

FIG. 11 is a side view of the jib crane that is folded downward.

FIG. 12 is a diagram showing a state of a jib folded downward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Post 3 Revolving part 4 Inverted V-shaped frame 5 Counter frame 6 Unwinding winch 7 Winding winch 8 Jib 8a Folding part 8b Root side 8c Tip side 9 Hanging tool 10 Hinge 11 Flange 12 Bolt 13 Root supporting wire 14 Fixed hardware

Claims (6)

[Claims] 1. A folding jib crane, wherein a hinge is provided substantially at the center of the jib of the jib crane, and the jib is folded upward. 2. The foldable jib crane according to claim 1, wherein a portion near the hinge on the base side of the jib is supported by a wire, and the tip on the tip side is pulled and folded by an up-and-down device. 3. A folding jib crane wherein a jib crane is provided with a hinge which can be folded laterally at a substantially central portion of the jib so that the jib is folded laterally. 4. The folding jib crane according to claim 3, wherein the jib of the jib crane is folded laterally by another crane provided near the jib. 5. A folding jib crane, wherein a hinge is provided substantially at the center of the jib of the jib crane, and the jib is folded downward. 6. The foldable jib crane according to claim 5, wherein a portion near the hinge on the base side of the jib is supported by a wire, and the tip on the tip side is loosened by an up-and-down device to be folded.