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Big Crane Using Smaller Crane as Counterweight

Those are small compared to the Hammerhead Cranes that are at the USA Navy shipyards. Sscroll down to page 190 and see one on the link. They have a 20 ton crane that rides above the 350 ton crane. the small crane is used to lift the steel ropes / cables onto the BIG crane....Building the Navy's Bases in World War II It is fun watching a master crane operator and the Millwrights using them.

https://www.youtube.com/watch?v=E1KwZnhuqkc
 
I work on moderately large cranes on a regular basis. Manitowoc 16000's, 18000's, Liebher 1600's, etc. The big tracked crawler cranes used to build wind farms. Typically 400' or more of boom. The loads aren't all that heavy, but they have to reach out quite a ways. Nominal rating on the big wind farm cranes is around 600T, but loads are typically 50T or less.

One of the interesting things, I think, is that everything breaks down small enough to come in on semi trailers. And the bulk of these cranes are errected by the crane itself. Typically only a small 90 ton rough terrain crane is used for assembly.The Manitowoc cranes have hydraulic legs that allow the "house" of the crane to raise off the trailer while the semi drives out. With a typical on-the-ground weight of a million pounds, it's a lot of semi's.
 
JP Machining said:
umm the first vid he linked is 600ton, the last is 2000 ton, just a bit more than the little 350 ton hammer head
Click to expand...


It is horses for courses...

It is all about lifting radius...

At what radius can the 2000 tonne crane actually life 2000 tonne... Or is it 2000tonne metre, meaning a theoretical capacity of 2000 tonne @ 1 metre..

The hammer head cranes may be able to lift their rated capacity at any radius they are capable of...
 
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