e-mosty December 2017 MSS and Formwork Travellers | Page 19

2.6.2 Almonte River Viaduct
Almont River Viaduct near Caceres (2013-2016) has a
central zone with 2 spans of 45 m and 7 spans of 42 m
over the arch of 384 m that were constructed by two
Overhead MSS. Approach viaducts have spans of
45 m, 6 spans on North side and 8 spans on South side
(Figure 27). Main contractor – U.T.E. Alcântara –
Garrovillas (FCC Ciudadanos + Conduril S.A.).
The deck of this viaduct is a box girder type and the
same section is used all along the Viaduct. The
distance between pouring supports of the MSS is
45 m on the access viaducts and 40.5 m on the central
viaduct decks. The construction joint of the deck is
made at 1/5 th of the span. The deck weight is 256
kN/m.
Piers 6 and 15 are fully solid in their upper part due to
the heavy loads brought by the suspension cables of
the arch that pass through the piers and the vertical
reaction of the pylons during arch construction.
Figure27: Almonte Viaduct
2.6.2.1. Access viaducts construction
The access viaducts were built with an MSS from the
abutment to the span just before the arch.
Two equal MSS were used. The formwork for the
access viaducts were replaced by different formwork
for the spans over the arches.
The supporting structure over piers 6 and 15 was
strongly conditioned by the size of deck supports
leading to the use of the complex structure shown in
Figure 29.
Figure28: MSS on last span of South Access Viaduct
4/2017
Figure 29: MSS supporting structure over piers before the arch