| 摘要 |
<p>A backstay spreader (51) attachable between a pair of backstay sections on a crane includes first and second members (52, 53) each having a backstay section connector (54, 55) at a first end and a pivoting joint connector (56, 57) at a second end, the pivoting joint connectors (56, 57) being used to hold the first and second members (52, 53) together with a pivotal connection and each having an extending portion extending away from the pivotal connection, with an angle between the extending portions. The backstay spreader (51) also includes an actuator (83) mounted between the pivoting joint connectors (56, 57).
A method of setting up a lift crane (10) includes the steps of attaching a boom to a rotating bed and a strut (29) to the boom (22); attaching jib backstay straps (33) between the strut (29) and the rotating bed (20) ; attaching an adjustable length spreader (51) between the jib backstay straps (33), the spreader (51) having a first length when being attached between the jib backstay straps (33); and extending the length of the spreader to a second length longer than the first (51) length after the spreader (51) is attached between the jib backstay straps (33).</p> |
