| 摘要 |
PROBLEM TO BE SOLVED: To provide a counterweight having a vertical frame expansion preventive means and a derailment preventive means taking countermeasures against an earthquake, etc., in which no welding work is required at site even when the vertical frame is formed of a sheet, and there are no troubles in loading a unit weight. SOLUTION: A fixing piece 20 is welded only to one side of the counterweight in advance, and after the unit weight is loaded, an intermediate stopper 21 and a connection piece 22 are fitted thereto.
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