The crane is being “jumped” by the addition of another section. Many people I talked to on the street couldn’t believe that the crane basically grows itself !
The weights are used to balance the crane. After each new section is added in a ‘jump’, these weights are raised and the boom extended, and time is taken to re-balance the crane.
These are the things that are used to tie the tower into the building. I am hoping someone can tell me what their proper name is.
This thing is used to hoist up the individual tower sections during the crane jumping.
There are three tie-backs planned for both the 13th and the 21st floors. Here are the tie-backs after they were finished on the 13th floor. Two go straight into the building, and one is positioned at what looks like a 45-degree angle. Particularly interesting was the placement of the diagonal tie-back. After it was raised, it was first attached inside the building. As we looked up, it appeared that the measurement was wrong, as the opposite side of the tie-back mechanism was short of the tower connection, by what looked like 6 inches or more. We thought that the end of the device wound be turned with a wrench to extend its length and complete the connection. But no ! The boom was extended, the hook was lowered, and the large weights were lifted and extended outward. This process causes the “deflection” to be balanced, and sure enough, the tie-back position closed up right into place. The Morrow guys told us that in the end, it was only 1/2 inch off.