To provide a derrick device that eliminates the need to change the positions of a pulley attachment point of a raised wire and a latching point of an oblique branch line separately when raising a mast.SOLUTION: A derrick device 1 also serves as four oblique branch lines by two raised wires 6a and 6b hung so as to intersect the lower ends of a mast 3. Two lifting wires 6a and 6b alternately support the load of the mast 3, and the raised wires 6a and 6b are alternately supported on upper pulleys 11a and 11b to raise the mast 3. At the raised position, two raised wires 6a and 6b are drawn to a steel tower, and the lower end of the mast is supported diagonally upward in all directions instead of the oblique branch lines.SELECTED DRAWING: Figure 2
【課題】マストのせり上げに当たり、せり上げワイヤの滑車取り付け位置と斜支線の掛け止め位置を個別に変更する手間のかからないデリック装置を提供する。【解決手段】デリック装置1は、マスト3の下端部を交差するように掛けられた2条のせり上げワイヤ6a,6bにより、4本の斜支線の役割を兼ねさせる。2条のせり上げワイヤ6a,6bに交互にマスト3の荷重を支持させ、交互に上方のせり上げ用滑車11a,11bへせり上げ上げワイヤ6a,6bを掛け替えてマスト3をせり上げる。せり上げた位置で2条のせり上げワイヤ6a,6bをそれぞれ鉄塔へ引き止め、マスト下端部を斜支線に代えて四方斜め上方へ支持する。【選択図】図2
ASSEMBLING METHOD OF STEEL TOWER, DERRICK DEVICE FOR BUILDING DEMOLITION WORK, AND RAISING METHOD OF DERRICK DEVICE
鉄塔の組立、解体工事用デリック装置及びそのせり上げ方法
2020-10-01
Patent
Electronic Resource
Japanese
IPC: | B66C Krane , CRANES |
European Patent Office | 2020
|Engineering Index Backfile
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European Patent Office | 2021
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