e-mosty December 2017 MSS and Formwork Travellers | Page 46

Figure 5 + 6: Formwork travellers
The construction of the main pylons is almost
finished, while the segmental construction of the deck
is in the early stages. The two first segments of each
pier were cast in autumn 2017.
The first segment of each pylon and of each side of
the Atlantic Bridge has the special feature that it was
cast using only the front part of the travellers.
The front travellers were lifted with hydraulic jacks
from the lifting structure and were fixed on the rear
part to the deck and on the frontal part were hung
from the lifting structure trough suspension bars.
As a consequence, the front traveller works as a
double supported structure during casting of the first
segment.
The next step is to move the front travellers down and
to assemble the rear parts of the travellers on the
ground.
4/2017
The lifting structures are launched and the complete
traveller, that has a weight of 220tn, is hydraulically
jacked into place.
After the lifting of the complete form traveller the
second segment is cast. From the second segment
and the following, the complete form traveller is used
to cast each segment.
For each segment, the traveller is launched and then
fixed on the previous concrete segment.
Each segment is deliniated longitudinally by two
laterals and one central precast diaphragm element.
The traveller provides skidding rails and devices to
move the precast elements to their position.
The lateral precast diaphragm formwork was also
designed and manufactured by Rúbrica.