Title:
ASSEMBLING METHOD OF STEEL TOWER, DERRICK DEVICE FOR BUILDING DEMOLITION WORK, AND RAISING METHOD OF DERRICK DEVICE
Document Type and Number:
Japanese Patent JP2020158301
Kind Code:
A
Abstract:
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
Inventors:
KAWASE JUNJI
NORITAKE KATSUYA
ISOMURA ATSUJI
WATANABE SHINYA
KAWASAKI NORIAKI
SUZUKI HIROYUKI
NORITAKE KATSUYA
ISOMURA ATSUJI
WATANABE SHINYA
KAWASAKI NORIAKI
SUZUKI HIROYUKI
Application Number:
JP2019063128A
Publication Date:
October 01, 2020
Filing Date:
March 28, 2019
Export Citation:
Assignee:
C TEKKU KK
SANWA TEKKI CORP
SANWA TEKKI CORP
International Classes:
B66C23/28; B66C23/60
Domestic Patent References:
| JPS4426267Y1 | 1969-11-05 | |||
| JP2009133139A | 2009-06-18 | |||
| JPS4725941A | ||||
| JP2017119571A | 2017-07-06 |
Attorney, Agent or Firm:
Tadashi Otsuka