| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a portal crane arrangement structure which can improve a yield strength as the whole by keeping a reduction rate low.SOLUTION: A plurality of cranes 3, 4 adjacent to each other in a travel direction are arranged on different tracks 17, and the lower end part of the leg of one portal crane is arranged by protruding below a girder to make girders 10, 13 approach each other for contact. This arrangement can reduce an interval b of the girders to decrease a value of the reduction rate, so that a wind load on the crane structure part is reduced. Further, a plurality of portal cranes are integrated to be charged with the wind load to concentrate yield strengths by fixing the lower end parts of the legs 9, 12 on the ground, and by making the girders come in contact with each other to fasten the plurality of portal cranes.</p> |
