085 — Direktlink
13.01.2016, 12:59 Uhr
Menzitowoc
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Hello Kim,
I understand your surprise and concern. In most other parts of the world, such congested sites would be staffed with luffing jib tower crane.
But in Germany and on the European continent in general (except Great Britain of course!), there are different legal restrictions. We do not have the “Oversailing Prohibited” issue as in British influenced legal systems. Tower crane jibs are allowed to swing over neighboring properties. Exceptions may arise from safety issues, but this is a rare situation.
So most construction sites are served with saddle jib tower cranes. In consequences, the tower crane rental fleets consist mainly of such crane types.
Also these saddle jib cranes are cheaper to buy (Trolley winch system is smaller, simpler design and so on) and cheaper to operate (easier setup, lower energy consumption).
So the saddle jib type is very widely used on German sites, even on many congested and narrow sites in Frankfurt. The advantages of the short tail radius, the variable jib radius and the much easier to navigate interference issue with other cranes on site were not so present in the minds of the site planers before the 1990th.
But since some years, German contractors more and more see the inherent advantages of the luffing jib tower cranes. An important promoter of this development was and is still the tower crane rental company Wilbert (now also a crane designer and manufacturer). They started to rent out large Wolff-luffers to power station construction – Wolff WK 60140B and WK 320B to the Schwarze Pumpe Power Station in the eastern part of Germany in the early 1990th .Later on they provided the cranes and the crane setup concept for the Commerzbank-Tower Skyscraper in Frankfurt, were one Wolff WK 60140B (later renamed WK 900 B), two Wolff WK 320B (setup as internal climbers, which is very, very rare in Germany) and three (or four?) Wolff WK 160B were on site. Luffers were used there mainly due to the concept of the building as a heavy steel frame design and the extreme narrow site condition.
But this site opened up the perspective for a wider use of luffing jib cranes in Frankfurt and throughout Germany in general.
When you look at the current situation in Frankfurt, there are several sites with luffers:
Henninger Turm– residential high rise building
TaunusTurm – Office and residential high rise building
Degussa Areal– several different buildings on relative cramped site.
Best regards
Christoph
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„In Europa gibt es zur zwei Typen von Staaten: Kleine Staaten und Staaten, die noch nicht verstanden haben, daß sie klein sind“ - Paul-Henri Spaak (1899 – 1972), Premierminister von Belgien, Präsident der Parlamentarischen Versammlung des Europarats, NATO Generalsekretär
Dieser Post wurde am 13.01.2016 um 13:00 Uhr von Menzitowoc editiert. |
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