| 摘要 |
PROBLEM TO BE SOLVED: To perform sling work for a counterweight without making a worker get on and off a top surface of the counterweight.SOLUTION: A counterweight 30 is integrally provided with a plurality of hanger members 40 for lifting the counterweight 30 by a crane 51. A link member 42 of the hanger member 40 can be freely rotated on a support shaft 41 between an upper position where a tip part is located above a top surface of the counterweight 30 and a lower position where the tip is located close to a lower part of the counterweight 30. |
