Große Turmdrehkrane

[S 46 0]

Obviously, I was wrong this time...

Here is the corrected version, which then does reach the claimed 125m HUH.
Along with a surprise, when it comes to height !
=> The MD 1600.
141m HuH as standard, and railgoing

Potain_MD2200_MD1600_01.pdf

Potain_MD2200_MD1600_01.pdf

[djlivus 0]

Obviously, I was wrong this time...

Here is the corrected version, which then does reach the claimed 125m HUH.
Along with a surprise, when it comes to height !
=> The MD 1600.
141m HuH as standard, and railgoing

Potain_MD2200_MD1600_01.pdf

Real giants!
But, I have one question. A crane like md1000, md1400, md1600 with double tower system 5,5x5,5 and 4x4m could attain the same height (136-141m) with only 5,5x5,5 mast?

[S 46 0]

Your direct answer:

As far as I understand Potain`s construction knowhow now, the answer is:

No.

First: The appropriate Adapter ( 5,5m to 3m ) is accordingly missing in their program.
Second: Although it would be theoretically possible to do so of course,
lesson is, that the overall performance of the crane would have be to reduced more than necessary.
Then why do it ?
Remember the disadvantages of a medium sized towersystem at high heights described before ?
And 5,5m is medium, when it comes to significantly more than 100m. It simply becomes unstable,
if you want to retain the best loading figures possible.
I `ll try in simple words now:
Look at the MD1600 in my latest drawing. Attach a very heavy load to it, at the tip of the mainjib.
Then think about the resulting bending of the towers.
Does the 4m section bend over more than the 5,5m section ?
The answer is: Yes !
Does the 5,5m section bend over ?
The answer is: Yes, but not as much as the 4m section.
So, think about the resulting "main force of bending", and apply that uprising to a total 5,5m system.
And before your answer, think about bending a thin ( flexible ) branch of a tree ( at a given lenght ), and try that with the same force uprising with a thicker
( more unflexible ) branch ( with the same lenght ).
Now: Which will crack first, firstly regardless ( => important ) of the applied force ?
( Whilst still the pronounciation is the word "uprising force"... got it ? )

And if you can imagine the thin branch being swept down to floorlevel now, without breaking, try that with the whole tree then. Good, good,
a sudden "kabumm" and there you go.
Game over.

The Science is: Keep the balance of flexibility <=> loading figures <=> height. ( and the safety margin !! )
But there is, as alread pointed out, a definit limit in the game.

P.S. Exaggerated : A Crane touching already ground because of flexibility whilst trying to lift a simple bucket would be great in terms of safety, but be of no use to the real world...( Remember the old Liebherr swinging 3m (?) off Center ?? ) But safely standing, at reduced loading figure for the given height. Hurray !

[djlivus 0]

@S46: A very scientific and developed answer! But now, it comes the next question....So, my question is: if a tower crane can freestand statical for a given height, could it attain the same height on rails, if provided a big enouf undercarriage? I answer you that because I have same examples of cranes that can do so: first, the much noted 150 m HUH Kroll k3000. Acoording to Kroll officials, the crane can be erected to the same height on rails. (although I,m not sure if the crane can attain the same load performances). Second example: Wilbert giant luffers. They normally, acording with data sheet on Wilbert website, have a maximum tower height of 98 m or so, with rail base of 12 m gauge. But there was a project of Wilbert 1350L with a tower of almost 130m on 16m gauge, so similar with the statical crane value.
Third example: Linden 8952. I questioned the ones from Comansa and they answered back that theoretically the crane could be mounted on rails with a height of more than 130m.
So, that is my question....
Much greetings,

djlivus

[djlivus 0]

So, finally, Liebherr issued the data sheet for 4000HC, unfortunately 4000HC100, not the 110m HUH giant 4000HC80

4000HC_100.pdf