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Traverses load-lifting Load-lifting traverses are intermediate member between hook of the load-lifting mechanism and load. Traverses are applied to lifting and moving by the crane of large-size loads with fastening to traverse in several points at the same time by means of load gripping devices or slings. Need of application traverse is caused by several factors. First, use of slings when raising large-size or lengthy loads is impossible because of shortage of lifting height at normal coal of strapping between branches. Secondly, during the work with similar loads there are considerable tensile forces in slings, flexural stresses in the lifted load and elements of fastening. The design traverse is defined by geometrical parameters of load, operating conditions traverses and technical characteristics of the crane on which hook it is hung. Load-lifting traverses happen two main types - linear and space. Linear traverses are made of pipes or two channels connected among themselves. On the ends traverse places of fastening of load gripping devices are placed. As a rule, length beam traverse does not exceed 4 meters as with bigger length the product deadweight which usually does not exceed 10% of mass of the lifted load is too big. Space traverses are made in the form of the elementary farms triangular or rectangular shape. Frame traverses are steadiest when using slings like 3CK or 4CK for their suspension on crane hook, at the expense of it there is possibility of raising of loads of considerable weight and dimensions, but, in the place with that, useful lifting height decreases. Traverses hang on hook of hoisting appliance for eye or finger which is fixed in body traverses, and also for rigid or flexible drafts. For fastening of slings and other removable load gripping devices, in beam traverses do opening: kerchiefs with eyes fix or establish axes between channels. To hook of the load-lifting mechanism of traverse can fasten for the central part or for end elements. At rise traverses for the center, the minimum requirements are imposed to lifting height, but requirements to the load considerably increase to avoid its distortion at rise. The centroid of load has to be in this situation on one line with the place of fastening traverses to crane hook (or it is the closest). At suspension traverses for end elements, it becomes steadier and balancing of load is not required. At the same time itself traverse to hook of the crane fastens by means of mnogovetvevy slings - 2CK for linear and 4CK (3CK) for frame.
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