BRIDGES Ӏ SECTOR SPOTLIGHT
SPMTs raised the bridge sections from 1.5m to 4.2m high to prepare for the main jacking operation. Next, with SPMTs reconfigured and JS500 jacking units secured, the team jacked up the bridge to a transport height of 9m, ensuring
clearance over street furniture and other obstacles.
After navigating through the urban
area the bridge sections were then jacked down onto their foundations. According to Mammoet the selected
installation methodology not only minimised traffic congestion, but also mitigated the safety risks typical in traditional construction methods. A video of the project can be seen here:
https://shorturl.at/uZK6m
Who: Wolffkran / Porr. What: Wolff cranes are helping build a 667-metre-long, 90-metre-high bridge over the river Neckar. Where: Horb, Neckar Valley, Baden-Württemberg, Germany.
German construction company Porr is utilising five Wolff tower cranes to build the bridge across the river Neckar, a rail line, and a cycle path – meaning space is tight on the job site. Two of the five tower cranes are Wolff 7534.16 Clear models. They are freestanding, operating at around 100 metres high. With 75-metre jibs, they are lifting
a maximum of 16.5 tonnes, and 3.4 tonnes at the top (four-strand operation). “This is normally not
possible with a freestanding crane,” explains Wolfgang Kavelius, sales manager at Wolffkran. “But the special design of the bridge piers meant that no tie-ins could be used, or they would have been disproportionately complex and expensive.” To ensure the necessary stability,
the towers were assembled using three different tower elements. The lower third of the towers is formed by the TV 33 tower elements with a side
length of 3.3 metres. Above this is a transition area composed of tower sections with side lengths of 2.5 metres. And on the upper half of the tower are 2x2-metre tower sections (TV 20). “This specialised structure makes it possible to limit the maximum tower deformation to well under two metres, thus allowing the cranes to be operated safely as freestanding units,” explains Peter Hegenbart, head of sales project engineering at Wolffkran.
28 CRANES TODAY
©Jürgen Pollak
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55
