TIE-BACK SYSTEM FOR CRANES, IN PARTICULAR HEAVY LOAD OFFSHORE CRANES

摘要

Tie-back system for a crane comprising a rotatable base (2) with a generally vertical support frame (9) and a lifting arm (5) which is with a lower end hingedly connected to the base in a hinge (7) point, an upper part of the frame carrying a displacement member (21) movable relative to the frame, the displacement member carrying a first cable guide (13, 13’) means, a first cable extending from a first connection point on the arm along the first cable (8, 10) guide means to a first pulling device(25). The displacement member comprising a tie connection point (39) for connection to a tie member (32, 32’, 33, 33’), a second cable (11, 12) guide means (14, 14’) attached to an upper part of the frame (9) and a second cable extending from a second connection point on the arm along the second cable guide means to a second pulling device (27). The frame comprising a stop part (35, 37) situated near the displacement member, wherein in a load transfer position the displacement member engages with the stop part for transferring a load on the first cable guide means to the frame.