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Golden Ears Bridge, Vancouver, Canada
Four pylons formed in weekly cycles without a crane
The formwork and scaffolding solution for the four H-shaped pylons was based on the modular-designed ACS self-climbing technology and the VARIO GT 24 girder wall formwork system. As a result, the continuously- changing pylon cross-sections could be constructed using 4-metre concreting cycle heights without requiring any crane support. Furthermore, the ACS climbing system was designed to handle extremely high wind loads due to the coastal location so that even during wind speeds of up to 80 km/h, safe climbing operations could be carried out.
The pylon legs underneath the carriageway deck were to be constructed as double piers in a longitudinal direction, and as individual piers in the form of a composite construction with prefabricated steel cores for the upper half. Through the use of two separate ACS/VARIO sets of formwork, one set for the top and bottom halves of the pylon respectively, time-consuming adjustment work on the climbing platforms and formwork could be avoided as well as keeping on-site material requirements to a minimum. For forming the front ends, the formwork elements were mounted on climbing platforms positioned on the longitudinal sides with the complete construction suspended on rollers - this meant that climbing brackets were not required at the front ends Only two climbing units were needed per individual pier - this accelerated each climbing operation and reduced material requirements. Offset ACS brackets ensured that the platforms of the four different working levels could still be securely interlocked.
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| PERI Systems In Use |
VARIO GT 24 Girder Wall Formwork
ACS R Self Climbing System
Cantilever Bracket
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Michael Hug
Polier
“I´ve been working for many years with PERI systems and I am convinced that the ACS climbing system and the VARIO wall formwork is the optimal solution. With the ACS, we were able to shorten the construction time. In my opinion, PERI provides the technically best formwork systems.”
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PERI Press Release 02/2009
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