Große Turmdrehkrane

[S 46 0]

@ S46: Maybe is about 5,5x5,5 m and 4x4m towers joint section. I think the triangle shaped items drawed by you can not be found in the actual crane. But , your innovation enhances the aesthetics of the crane.
Why it was necessary such a towers combination (5,5 and 4m towers), for economical reasons?
Do you have any idea if Potain MD2200 with 125 m under hook height use such a combination? I have never heard about a MD2200 with compound tower.

greetings,

djlivus

Hi djlivus,

Very good !!
you`ve found a major mistake in the drawing. In reality, it is just a simple frame.
The ( triangle ) Transitionpiece seems only to be used at the climbing cage section, where stronger
forces are to be expected.

=>( There is one more ( minor ) mistake to be detected. Look for the lifting mechanism )<=

Towercombinations are used, if you expect strong forces due to height and lifting capacity.
A tower with a given diameter has it`s maximum allowable height - exeeded it will become weak.
And the bigger the diameter is, the higher it can get. So what to do, if you still have to get higher ?
Well, either use a larger diameter tower ( 8 - 12m ), or use the moderate tower ( 5 - 8m ) within it`s limits
and combine that with another ( smaller ) one on top, also within it`s limits.
Of course you have to add the static of the smaller system to the bottom one, which is, why this is usually lower in it`s actual height compared to it`s theoretical achievable height.
It therefore has to be noted, that there is a physically limit to this game of combining.
You can see that principle performed by every major crane manufacturer => Wolff, Liebherr,
and especially Wilbert with it`s Maxi - Lifter Range ( E 66 ).
Such combinations are also often to be seen with small towersystem cranes in southern europe, where space restrictions inhibit the use of large diameter towersystems.

The mentioned MD 2200 simply can`t use a towercombination at the moment, I assume.
It is designed for the 5,5m system as standard tower, which is also the biggest produced by Potain.
You can`t put a MD 2200 ( and upfollowing Models ) on a tower smaller than the 5,5m, and a bigger
one for combinations with the 5,5m tower is yet not being produced. At least to my knowledge.
I also would say, that a MD 2200 with 125m HuH will be at it`s limit with the 5,5m tower. Additional anchoring might be advisable. Usually the MD Range will not go higher than 105m, or you use a towercombination ( which is possible with smaller models until the MD 1600; all come with less than 5,5m as standardtower).

[S 46 0]

Manually, see the photo (from internet)
It works on a lever principle. In this way hydraulic cylinder`s capacity is increased 2x.
In these holes is attached upper part of the tower when telescoping. Cylinder extends 1m, holes every 0,5m...

( Sorry for my late response... )

Thank you, lina 357.

So, on the MD - Series there is one cylinder, which grabs ( one ? ) pair of the levers ( to the left and right ).
These are then bolted to the hole - strip, and lift the crane. The purpose of the second pair of levers
( beneath the top one`s ) is to secure the crane, when the top levers have to swing back for the next lift ?
That means, that one lift of the levers will result in max. 1m of crane movement, and has therefore to be repeated six times
( as a towersegment is 6m ) ?
Did I get this right ?

[S 46 0]

...talking about Potain`s MD Series...
Here is the MD 3200 ! With the new Cab.

Very complicated! I don`t know, if I got all aspects right.

Potain_MD_3200_1.pdf

Potain_MD_3200_1.pdf

[S 46 0]

...and my study of a MD 3600.

( With old Cab, like the original )

Of course, the two existing real ones aren`t railgoing ( correct ? ), and had at last a 50m Boom.
On the fuzzy, blurry pictures I posess I detected two auxiliary cranes, a giant double hook
assembly, and I know, that the crane has got two independent hoisting machines, one for a heavy lift line
and one for a lightweighted faster lift line.
Furthermore, the MD 3600 is a thoroughly revised version of the MD 2200 used as "Base Model".

Is this correct ?

Anyway, here you go.

Potain_MD_3600_1.pdf

Potain_MD_3600_1.pdf

[djlivus 0]

@S46: Thank you 4 your very detailed and comprehensive explanations. Also, nice your irony about my discovery ...So a MD1400 or MD1000 could have been mounted on 5,5x5,5m tower system for their maximum heights , but it's enough (and more economical) to use a 5,5 and 4m combination.

potain MD2200 is freestanding and rail-going for 125 m under hook. It seems to be very impressive. Among all producers, Potain made some of the tallest saddle jib tower cranes.(up to 140m, frestanding and rail-going for a series crane)


greetings,

djlivus bearbeitet 11. April 2011 von djlivus