Große Turmdrehkrane

[S 46 0]

@ djlivus: FIRST !! It should read first... it was too early this morning....sorry.
And you have Mail....
@ lina357: Fixing the tower to a building could have been a very good reason to switch back to a top slewing unit too. Imagine a 850m K25000 building the Burj tower in Dubai... ...ok,ok, I`m only kidding. Wrong crane for this building.

[djlivus 0]

I think you`re right, next reason could be ability of fixing the tower to the building at greater heights.

Kroll k-10000 and kroll k-25000 from 80s were not top slewing ,because they had no necessary technology
to make them so. It is much more economical to make a tower crane top slewing than bottom slewing. At a big crane like k-10000 the tower weighs hundreds of tonnes , so ,much energy is needed to revolve it. Almost all hammer head tower cranes are top slewing, as far as I know. Or is much easier to revolve only the upper part of the crane...You are also right, of course. If a crane is bottom slewing it can not be braced to the building

[djlivus 0]

Potain md series inspired many chinese tower cranes. Here an MD22000 and an d his chinesse counterpart m2200. still, I think m2200 is inspired by the old potain md-2200, because it has no new vision cab

[linaprin 1]

Kroll k-10000 and kroll k-25000 from 80s were not top slewing ,because they had no necessary technology
to make them so.

Which technology do you mean?

It is much more economical to make a tower crane top slewing than bottom slewing. At a big crane like k-10000 the tower weighs hundreds of tonnes , so ,much energy is needed to revolve it. Almost all hammer head tower cranes are top slewing, as far as I know. Or is much easier to revolve only the upper part of the crane...You are also right, of course. If a crane is bottom slewing it can not be braced to the building

In fact Kroll had choosen a bad solution, I think...after early 50` no bottom slewing hammer head tower cranes were manufactured.

[djlivus 0]

KB-674 russian tower crane. Although it is not a huge tower crane, it is still a big crane.
Kb674A has a maximum height under hook of 85 meters and the maximum load is 25 tonnes. Together with
newer Kb-676 it is used for construction of building up to 25 floors or even more. It also can be met on power plant construction site, as well.