Two-piece main boom for a latice-boom crane and method for...

B - Operations – Transporting – 66 – C

Patent

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Details

B66C 23/82 (2006.01) B66C 23/34 (2006.01)

Patent

CA 2520847

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, to prevent tipping of the crane. The main boom (1, 2) is 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). When the lever arm is within acceptable limits, the boomis raised, after which the boom sections are aligned and locked. Also disclosed are a boom and crane with such a boom.

Cette invention concerne une méthode d'érection et de désassemblage d'une flèche principale constituée d'au moins deux parties pour une grue avec flèche en treillis. Les opérations d'érection et de désassemblage sont conçues de telles sorte que les propriétés cinématiques géométriques de la flèche principale (1, 2) sont exploitées pour réduire le bras de levier effectif (1') de ladite flèche, ce qui empêche la grue de basculer. La flèche principale (1, 2) est repliée au point d'articulation (A), auquel les deux partie de la flèche (1, 2) sont raccordées l'une à l'autre, faisant que les deux parties de flèche (1, 2) font un angle l'une part rapport à l'autre. Lorsque le bras de levier se trouve dans des limites acceptables, on procède à l'érection de la flèche, après quoi les deux parties de flèche sont alignées et verrouillées l'une à l'autre. Sont également décrites une flèche et une grue avec une telle flèche.

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