| 摘要 |
PROBLEM TO BE SOLVED: To provide a quay crane (low profile crane) having a slide-type boom movably supported in a horizontal direction on a leg structure in which the weight of the moving slide-type boom is reduced, and stability is improved.SOLUTION: A quay crane 1 has a fixed boom 3P fixed to a leg structure and a mobile boom 3S movably supported in a horizontal direction along the fixed boom 3P instead of a slide-type boom. The fixed boom 3P has stationary side travel rails 5P on which a trolley 4 travels, the mobile boom 3S has mobile side travel rails 5S on which the trolley 4 travels, the stationary side travel rails 5P and the mobile side travel rails 5S are arranged so as to have an overlapped section where the rails are overlapped at least partially, and the trolley 4 has wheels 6P,6S respectively corresponding to the stationary side travel rails 5P and the mobile side travel rails 5S. |
