| 摘要 |
PROBLEM TO BE SOLVED: To provide a revolving frame structure capable of simply reinforcing a center beam without causing welding failure. SOLUTION: This revolving frame structure has a pair of the center beams 2, 3 arranged on a central part of a bottom plate, attachment mounting parts 6, 7 provided on a front part of each of the center beams and counterweight supporting parts 11, 12 formed on a rear part of each of the center beams, the center beam 3 has a vertical plate 13 to communicate the attachment mounting part 7 and the counterweight supporting part 12 to each other, and a reinforcing material 14 formed to match an upper edge line 13a of this vertical plate 13 is connected at reast to either one side surface of the vertical plate 13 in a state of setting it along on an upper edge of the vertical plate 13. COPYRIGHT: (C)2006,JPO&NCIPI
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