| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel tower assembling/disassembling derrick which carries out quick assembly when a steel tower is set up, and achieves quick removal thereof, and to provide a method of removing the derrick. SOLUTION: According to the structure of the steel tower assembling/disassembling derrick, a boom 3 is mounted on a mast 2 via a rotating member 14, and the mast 2 is cut at a location of the rotating member 14 so that an upper mast 2a is rotatable together with the rotating member 14. The boom 3 has a hook 7 attached to a distal end thereof via a hoisting wire rope 8 which is then inserted into the mast 2 via a guide roller 9, and a derricking wire 11 is attached to the vicinity of the distal end of the boom 3. The derricking wire 11 passes through a derricking wire pulley 12, and the other end of the derricking wire 11 is fixed to the mast 2 in a circumferentially rotatable manner. Further, fixing ropes 16 are connected to mast guides 4, 5 and a mast mount 6, and a crane device 21 is connected to the mast mount 6, and two mast guides 4, 5 are provided. COPYRIGHT: (C)2009,JPO&INPIT
|
