JPH1121082A - Jib crane for crane dismantling - Google Patents

Abstract

(57) [Summary] [Problem] To improve the efficiency of removing a crane from the roof of a building by reducing the number of dismantling cranes required to disassemble the climbing crane installed on the roof of the building after the building is completed It aims at improvement. SOLUTION: The frame can be divided into a main frame and a sub-frame, and a jib and a center rod are provided on a main frame side in front of the sub-frame. A stay engaging with the rod and a hoisting means for raising and lowering the jib and hoisting the suspended load are provided; the main frame is provided with a compression rod engaging one end with a central rod; A jib crane for dismantling a crane with a detachable main frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib crane for constructing a high-rise building such as a building while climbing, and then disassembling a climbing crane or the like installed on the roof of the building.

[0002]

2. Description of the Related Art Among construction methods for building high-rise buildings such as buildings, Japanese Utility Model Publication No. 55-24070 and Japanese Patent Publication No.
When a building is constructed while performing floor climbing using the climbing crane described in Japanese Patent No. 1111, a climbing crane installed on the rooftop of the building becomes unnecessary after the building is completed. For this reason, there is a method of dismantling a climbing crane by installing a large truck crane for demolition on the ground around the building, but disassembling it.However, it may not be possible to secure enough area to install a crane on the ground around the building. . Or, the building may be too tall to reach from a ground crane. In such a case, the climbing crane is dismantled according to the procedure shown in FIG. First, a new, slightly smaller crane for dismantling is installed on the roof of a building by using the installed climbing crane, and the climbing crane installed earlier is dismantled and removed with this dismantling crane. By repeating this operation, the crane installed on the roof of the building was gradually reduced, and finally the crane that could be dismantled and removed manually was used to lift the crane down to the ground after dismantling. However, when the capacity of the climbing crane is small, the number of demolition cranes is small.However, if the building has become high-rise and the climbing cranes used for the construction have become large in recent years, the The number increased, and the number of times of installation and disassembly increased.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention has been made in order to solve the above-mentioned drawbacks. It is an object of the present invention to improve the efficiency of removing a crane from the roof of a building by reducing the number of used cranes.

[0004]

A frame is divided into a main frame and a sub frame, and a jib and a center rod are provided on a main frame side in front of the sub frame, and a rear portion of the sub frame is provided. Is provided with a stay engaging one end with a central rod and hoisting means for raising and lowering the jib and hoisting the suspended load.The main frame is provided with a compression rod engaging one end with the central rod, The compression rod and the main frame are detachable by the jib.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A jib crane for dismantling a 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 a dotted line, and FIG. 3 is an entire view 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 so as to be able to be divided by pins, and a main gantry frame 12 is provided below the main frame 1 via a main slewing gear 13. 12 is fixed on the roof of the building. The gate-shaped central rod 4 has a lower part detachably attached to a front end of the sub-frame 2 by a pin, and an upper part thereof and a front end of the main frame 1 are connected by a compression rod 6. The pin is used. The upper part of the central rod 4 and the rear end of the sub-frame 2 are connected by stays 5, and pins are used for connecting both ends of the stays 5. The jib 3 has a root portion attached to the front end of the sub-frame 2 so as to be able to undulate using a pin, and an end portion of a wire rope extended from an undulation winch 15 is fixed to the tip portion. In addition, the undulating winch 15 and the hoisting winch 7 are both provided at the rear portion of the sub-frame 2. The turning of the crane is performed by the main turning means 14 of the main frame 1 and the main turning gear 1.
3 and the jib 3 is raised and lowered by driving the raising and lowering winch 15 on the sub-frame 2 and winding and feeding out a wire rope. Hoisting winch 7, Upper sheave 8, Hoisting wire rope 11, Jib tip sheave 9, Hook block 1
The load is raised and lowered by using a hoisting means 19 comprising a compression rod 6.
Represents a compressive force, and a tensile force acts on the central rod 4.

Next, a description will be given of a case where the crane according to the present invention is used for dismantling the 200-cm climbing crane 20. At this time, the dismantling crane used is the conventional 12 crane.
The crane has the capability of a 0 tm crane 21 and a 60 tm crane 22. First, a jib crane 30 for dismantling a crane shown in FIG. 1 is installed on the rooftop of a building using a 200 tm climbing crane 20. The installation procedure is as follows. The main gantry frame 12 is installed and fixed on the roof of the building, the main slewing wheel gear 13 is mounted on the main gantry frame 12, and the main frame 1 is placed thereon.
Is installed so that it can turn. Next, the sub-slewing wheel gear 17,
Hoisting winch 7, undulating winch 15, sub-rotating device 18
Is detachably attached to the main frame 1. The central rod 4, the stay 5, and the compression rod 6 formed in a gate shape are sequentially attached to the upper surface of the subframe 2 and the main frame 1 so that the lower end thereof is detachably attached. Each of the compression rods 6 is detachably attached. Finally, the jib 3 is attached to the sub-frame 2 so as to be able to undulate, and the wire rope is drawn out from the undulation winch 15 and the hoisting winch 7 and wired, thereby completing the assembly. The 200 tm climbing crane 20 is disassembled using the jib crane 30 for dismantling the crane, and is removed from the roof of the building.

Next, referring to FIGS. 2 and 3, a description will be given of how a jib crane equivalent to a 60 tm crane 22 can be obtained by disassembling the jib using its own jib. First,
The sub-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 swiveled, the sub-slewing ring gear 17 attached to the lower surface of the sub-frame 2 is joined to the joint surface of the sub-gantry frame 16, and the sub-gantry frame 16 is mounted so as to be pivotable. Fixed to. Then, raise the jib 3 and press the compression rod 6,
When the main frame 1, the main slewing ring gear 13, and the main gantry frame 12 are sequentially removed, the crane 40 in FIG. 3 can be obtained. This crane 40 is an up-and-down winch 1
5, the jib 3 can be raised and lowered, the hoisting winch 7 can be used to raise and lower the hook block 10, and the sub-swing means 18 and the sub-slewing gear 17 on the sub-frame 2 can be turned. At this time, the load generated by the suspended load acts on the central rod 4 as a compressive force and acts on the stay 5 as a tensile force. The crane 40 in FIG. 3 is a conventional 60 tm crane 22. Furthermore, the conventional 2
By constructing the crane dismantling jib crane 130 corresponding to the 4 tm crane 23 and the 5 tm crane 24 as the crane shown in FIG. 1, the crane 40 shown in FIG. If the work is performed in the same manner as described above, the crane 140 can be manually dismantled, and all the dismantling work can be completed. As can be seen from the above description, two cranes having adjacent capacities can be structurally one crane, and a crane having a smaller capacity can be disassembled by using its own jib. In addition, by minimizing the number of parts to be dismantled, the efficiency of dismantling work can be improved.

[0008]

As described above, if the crane of the present invention is used for dismantling a climbing crane installed on the roof of a building, the total number of dismantling cranes can be reduced and the dismantling work period can be shortened. In addition, since the crane before and after the disassembling operation using the own jib can be used as a normal crane, the number of cranes to be held can be reduced and the cranes can be used effectively. Furthermore, as shown in FIG. 5, even if the crane to be dismantled is located at a higher place due to the rooftop shape, the disassembly procedure, etc., the dismantling operation can be performed by using a mast type climbing crane.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a crane for dismantling a crane according to the present invention.

FIG. 2 is an overall side view showing a portion that can be disassembled using its own jib by dotted lines.

FIG. 3 is an overall side view after disassembly using a self-made jib.

FIG. 4 is a process diagram showing a conventional climbing crane dismantling procedure.

FIG. 5 is an overall side view of a jib crane for dismantling a crane according to the present invention provided with a mast to be a climbing crane.

[Explanation of symbols]

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 disassembly using its own jib

Claims (1)

[Claims] 1. A frame is divided into two parts, a main frame and a sub frame. A jib and a center rod are provided on a main frame side in front of the sub frame, and one end is provided on a rear side of the sub frame. A stay engaged with a central rod and hoisting means for raising and lowering the jib and hoisting the suspended load; a compression rod engaging one end of the main frame with the central rod; A jib crane for dismantling a crane having a detachable main frame.