e-mosty December 2017 MSS and Formwork Travellers | Page 12

2.4.1 Cornella viaduct
For the Cornella Viaduct construction in Barcelona
(2004-2005) a new MSS for heavy loads was designed,
as the viaduct had 11 spans with different lengths of
27 – 35 – 36 - 40 m, with a deck weight of 512 kN/m
near the piers and a current weight of 368 kN/m.
The launching operations, over the motorway, were
done mostly during night periods. A record of 2 hours
and 15 minutes to open the formwork, launch the
girder and close the formwork was then reached,
after performing it several times in 3-4 hours.
Main contractor - Construcciones RUBAU SA.
Figure 11: Cornella Viaduct cross section (left) and MSS (right)
2.4.2 Llobregat Viaduct
In 2005, AP Bridge Construction systems designed
another MSS for the Llobregat Viaduct construction in
Barcelona for a heavier U-shape concrete girder with
4.2 m high walls, 16.8 m maximum width and 14 m
usable width (Figure 12:).
Main contractor - Acciona SA.
These two heavy railway bridges were built by a new
MSS model - AP2005 - with the capacity of hanging
400 kN/m concrete deck load plus the necessary inner
and outer formwork, concreting spans of 50 m always
in one stage only. This also showed that it would be
easy to adapt them for larger spans with lighter deck’s
self-weights, such as those used for roadway viaducts.
The 50 m span deck had a self-weight of 337 kN/m,
but considering local reinforcements the average
weight was 400 kN/m. Due to the high walls and the
slab beams, the formwork weighed about 50 kN/m,
even though the MSS could open the formwork in 10
minutes and do the complete launching in 3 hours.
Figure 12: Llobregat Viaduct sections (left) and MSS (right)
4/2017