[WRE UPDATE | PRODUCT]
Photo C
A second set of blocks controls the opening movement. These 10-part blocks use 2-inch wire rope and are operated by 100-ton hydraulic winches.
used. By August, the two identical Claw assemblies were ready to be installed on the VB 10,000 lift system and undergo testing prior to deployment. As work on the Claw progressed, four identical baskets to be used in conjunction with the device were engineered and fabricated at Versabar and C&C Marine in Belle Chasse, LA. T e baskets, each with a support capacity of 1,250 tons, were designed with built-in outward-facing hooks, in order to be lifted from underneath by a steel pipe. T e new design would
allow for a more effi cient recovery procedure and gave the baskets the fl exibility of being lifted either by the Claw, or a customized rigging solution.
HOW THE CLAW WORKS T e main hoist blocks of the VB 10,000 lift system control the raising and lowering movement of the Claw assembly. A second set of blocks controls the opening movement. T ese 10-part blocks use 2-inch wire rope and are operated by 100-ton hydraulic winches. T e block connection rigging consists of a long
throat pelican hook and a 3.5” 3-part x 30’ sling to attach to each claw half (Photo C). T e pelican hook can easily attach to the sling, eliminating the need for manpower in assembling the rigging. When each Claw block is raised, the Claw half rotates on the pin at the girder, resulting in the opening of the Claw (Photo D). When the block is lowered, gravity pulls the jaws of the Claw back to a closed position. Each Claw assembly operates independently from the other, but they can be used in tandem for a double Claw lift.
WIRE ROPE EXCHANGE
JANUARY-FEBRUARY 2012
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