| 摘要 |
The present invention substantially relates to a method for erecting and disassembling an at least two-piece main boom for a lattice-boom crane. The erecting and disassembling procedure results in that the geometric kinematic properties of the main boom ( 1, 2 ) are used in such a manner that during the erecting and disassembling, the effective lever arm ( 1' ) of the main boom ( 1, 2 ) is reduced. This results from the main boom ( 1, 2 ) being bent at the hinge point (A), at which at least two boom portions ( 1, 2 ) are connected to each other, and thus an angle position is produced between the two boom portions ( 1, 2 ). Further, the invention relates to a main boom ( 1, 2 ), which can be erected by the method as well as a lattice-boom crane having such an main boom ( 1, 2 ).
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