| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a crane stiffening structure capable of lengthening the service lift of a girder, by surely preventing the occurrence of a fatigue crack in a welding part just under a rail, in a crane having a structure or making a wheel travel on the rail arranged on the girder. Ž<P>SOLUTION: A load from a traversing main rail 29 is dispersed by a concrete member 50 by arranging the concrete member 50 just under the traversing main rail 29, and stress generated in the welding part of a traversing main box girder 15 is reduced, and a fatigue strength of the welding part of the traversing main box girder 15 can be improved. As a result, the occurrence of the fatigue crack in the welding part of the traversing main box girder 15 is precisely prevented, and the service life of the traversing main box girder 15 can be lengthened. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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