This devise is, ; uppermost H beam or driving to the I-beam rails the birds are transported along the frame portion, in the saddle frame parts being transported along a single rail-type crane girder structure that is perpendicular to the bottom having, ; The guide rollers are provided respectively before and after the saddle frame parts Driving along the bottom side support rails such that the H-beam is characterized by the configuration phase to ensure that the roll ring, ; Birds frame portion configured to allow secure two weights according to the reliable operation of the birds by the elimination of non-uniform load and consequent unstable operation state due to the bending stress exerted on the housing portion to prevent a safety accident due to the falling and the like heavy materials that can ensure the safety of the operator is to work in the following can have the effect that, to a single-rail type crane structure.
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