JP3939819B2 - Jib crane for crane demolition - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a jib crane for dismantling a climbing crane or the like installed on the roof of a building after constructing a high-rise building such as a building while climbing.
[0002]
[Prior art]
Among the construction methods for building high-rise buildings such as buildings, when building a building while performing floor climbing using a climbing crane described in Japanese Utility Model Publication No. 55-24070 and Japanese Patent Publication No. 55-11111, This eliminates the need for a climbing crane installed on the roof of the building. For this reason, there is a method of dismantling a climbing crane by installing a large truck crane for dismantling on the ground around the building, but it may not be possible to secure an area for installing the crane on the ground outside the building. . Or the building may be too high to reach from a ground crane. In such a case, the climbing crane is disassembled according to the procedure shown in FIG. First, a new small crane for demolition is installed on the roof of the building using the installed climbing crane, and the climbing crane previously installed with this demolition crane is dismantled and removed. By repeating this work, the crane installed on the roof of the building was gradually made smaller, and finally the crane that could be demolished and removed by human power was lowered to the ground by the elevator of the building after demolition. However, when the capacity of the climbing crane is small, the number of dismantling cranes can be reduced. However, as the number of climbing cranes that perform construction increases in size as in recent years, the dismantling crane inevitably increases. The number increased, and the number of installations and dismantling was to increase.
[0003]
[Problems to be solved by the invention]
In view of the circumstances as described above, the present invention reduces the number of cranes used for dismantling required to dismantle a climbing crane installed on the roof of a building after the construction of the building is completed. The purpose is to improve the efficiency of the work to remove from the roof of the building.
[0004]
[Means for Solving the Problems]
The frame can be divided into a main frame and a sub frame. A jib and a central rod are provided on the main frame side which is the front of the sub frame, and one end is engaged with the central rod at the rear of the sub frame. And a hoisting means for raising and lowering the jib and hoisting the suspended load. The main frame is provided with a compression rod having one end engaged with a central rod, and the root portion of the jib is located on the inner side of the frame. The compression rod and the main frame are detachable by the jib.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A crane dismantling jib crane according to the present invention will be described with reference to the drawings.
FIG. 1 is an overall perspective view showing an example of the embodiment, FIG. 2 is an overall side view showing a portion that can be disassembled using its own jib by dotted lines, and FIG. 3 is an overall view that has been disassembled using its own jib. It is a side view.
According to FIG. 1, the main frame 1 and the sub frame 2 are joined to each other by pins, and a main frame frame 12 is provided at the lower part of the main frame 1 via a main turning wheel gear 13. 12 is fixed on the roof of the building. The lower part of the gate-shaped central rod 4 is detachably attached to the front end of the sub-frame 2 with a pin, and the upper part and the front end of the main frame 1 are connected by a compression rod 6, and both ends of the compression rod 6 are connected to each other. A pin is used. The upper portion of the central rod 4 and the rear end portion of the sub frame 2 are connected by a stay 5, and pins are used for both end connection portions of the stay 5. The jib 3 has a root portion attached to the front end portion of the sub-frame 2 using a pin so that it can be raised and lowered, and an end portion of a wire rope fed out from the raising and lowering winch 15 is fixed to the tip portion. The undulating winch 15 and the hoisting winch 7 are both provided in the rear portion of the subframe 2. The crane is turned by the main turning means 14 and the main turning wheel gear 13 of the main frame 1 and the jib 3 is raised and lowered by driving the raising and lowering winch 15 on the subframe 2 and winding and unwinding the wire rope. . The hoisting means 19 comprising the hoisting winch 7, the upper sheave 8, the hoisting wire rope 11, the jib tip sheave 9, and the hook block 10 is used to raise and lower the load, and the compression rod 6 compresses the compressive force by the load generated at that time. A tensile force acts on the central rod 4.
[0006]
Next, the case where the crane of the present invention is used for dismantling the 200 tm climbing crane 20 will be described. At this time, the dismantling crane to be used is a crane having the capabilities of the conventional 120 tm crane 21 and 60 tm crane 22. First, using a 200 tm climbing crane 20, a crane disassembly jib crane 30 shown in FIG. 1 is installed on the roof of the building. The installation procedure is as follows. The main mount frame 12 is installed and fixed on the roof of the building, the main turning wheel gear 13 is mounted on the main mount frame 12, and the main frame 1 is mounted on the main mount frame 12 so as to be turnable. Next, the sub frame 2 having the sub swivel gear 17, the hoisting winch 7, the hoisting winch 15, and the sub swivel device 18 is detachably attached to the main frame 1. A central rod 4, stay 5, and compression rod 6 formed in a gate shape are sequentially attached to the upper surface of the subframe 2 and main frame 1 so that the lower end is detachable, and the upper end is connected to the central rod 4, stay 5, and central rod 4. Each compression rod 6 is detachably attached. Finally, the jib 3 is attached to the subframe 2 so that it can be raised and lowered, and the wire rope is drawn out from the raising winch 15 and the hoisting winch 7 to complete the assembly.
The 200 tm climbing crane 20 is disassembled using this jib crane 30 for dismantling the crane and removed from the roof of the building.
[0007]
Next, from FIG. 2 and FIG. 3, it will be described that a jib crane equivalent to the 60 tm crane 22 is obtained by disassembling using its own jib. First, the sub cradle frame 16 is lifted by the jib crane 30 for dismantling the crane shown in FIG. 1 and temporarily placed at a predetermined position on the building roof. Next, the crane 30 is turned, and the joint surface of the sub turning wheel gear 17 attached to the lower surface of the sub frame 2 and the sub base frame 16 are aligned and attached so as to be able to turn, and then the sub base frame 16 is attached to the roof of the building. Secure to. Then, when the jib 3 is raised and the compression rod 6, the main frame 1, the main turning wheel gear 13, and the main mount frame 12 are sequentially removed, the crane 40 shown in FIG. 3 can be obtained. The crane 40 can raise and lower the jib 3 using the hoisting winch 15, and can raise and lower the hook block 10 using the hoisting winch 7, and can turn by the sub turning means 18 and the sub turning wheel gear 17 on the subframe 2. It can be performed. At this time, the load generated by the suspended load acts as a compressive force on the central rod 4 and a tensile force on the stay 5. The crane 40 shown in FIG. 3 is a conventional 60 tm crane 22.
Further, by constructing the crane dismantling jib crane 130 corresponding to the conventional 24 tm crane 23 and the 5 tm crane 24 like the crane shown in FIG. 1, the crane 40 shown in FIG. If installed on the rooftop and operated in the same manner as described above, the crane 140 can be dismantled manually, and all dismantling operations can be completed.
As can be seen from the above description, two cranes with adjacent capacity can be structurally made into one crane, and a large capacity crane can be disassembled using its own jib, making it a smaller capacity crane, Moreover, the efficiency of the dismantling work can be improved by minimizing the number of parts to be dismantled.
[0008]
【The invention's effect】
As described above, if the crane of the present invention is used for dismantling the climbing crane installed on the roof of the building, the total number of dismantling cranes can be reduced and the dismantling work period can be shortened.
In addition, since both cranes before and after the disassembly work using their own jib can be used as ordinary cranes, the number of cranes owned can be reduced and the cranes can be used effectively. Furthermore, even if the installation location of the crane to be disassembled as shown in FIG. 5 is high due to the shape of the rooftop, the convenience of the disassembly procedure, etc., dismantling work can be performed by using a mast type climbing crane.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a jib crane for crane dismantling according to the present invention. FIG. 2 is an overall side view showing a portion that can be disassembled using its own jib. Rear side view [Fig. 4] Process diagram showing a conventional climbing crane disassembly procedure. [Fig. 5] Overall side view of the crane dismantling jib crane according to the present invention provided with a mast.
DESCRIPTION OF SYMBOLS 1 ... Main frame 2 ... Sub frame 3 ... Jib 4 ... Center rod 5 ... Stay 6 ... Compression rod 7 ... Hoisting winch 30, 130 ... For crane dismantling Jib crane 40, 140 ・ ・ ・ Jib crane after disassembling using own jib

Claims (1)

The frame can be divided into a main frame and a sub frame. A jib and a central rod are provided on the main frame side which is the front of the sub frame, and one end is engaged with the central rod at the rear of the sub frame. And a hoisting means for raising and lowering the jib and hoisting the suspended load. The main frame is provided with a compression rod having one end engaged with a central rod, and the root portion of the jib is located on the inner side of the frame. A jib crane for dismantling a crane, which is attached to the hoist so that the compression rod and the main frame can be attached and detached by the jib.

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