Sogea - 1999 annual report - Vinci

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2. Dodin completed
construction of a second
Saint-Denis Viaduct,
near the Stade de France,
in early 2000.
3. Dodin is building
the Rauze Viaduct on
the A20 Motorway for
the Autoroutes du Sud
de la France. Composed
of a single girder deck
resting on piers which
are more than 100 metres
high, the structure will
be 555 metres long and
24 metres wide, with
spans of 130 metres.
4. Dodin is currently
building 15 standard
engineering structures
on the A87 Motorway
between Angers
and la Roche-sur-Yon.
In the overseas departments, Sogea is recognized
today as one of the main civil engineering operators,
particularly in the area of the environment.
In Africa, where Sogea and its subsidiary Satom
generate half their business in roadworks, the group
is now also expanding onto the engineering structure
market.
In Europe, Norwest Holst is one of the major British
earthmoving and environment-related civil
engineering companies and it also builds engineering
structures. Finally, Denys remains very active in high
tech civil engineering (tunnel boring, microtunnelling,
underground works).
Activity
In mainland France, after handing over the Tanus
motorway viaduct (architect: Ph. Fraleu) and the
Vernègues high speed rail viaduct (architect: Amadeo),
Dodin began construction of the Verrières Viaduct
(architect: Mascarelli) near Millau and la Rauze
Viaduct (architect: Lavigne) in the Lot whose tallest
piers reach a height of more than 140 m.
The company also continued the expansion of the Saint-
Denis Viaduct in the Paris area; several engineering
structures on the A89 (Bordeaux-Clermont-Ferrand),
A87 (Angers-La-Roche-sur-Yon), A66 (Toulouse-
Pamiers) and A20 (Brive-Toulouse) Motorways;
maritime works in the Toulon naval shipyard and the
port of Saint-Nazaire. Finally, Dodin began work on
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VAL DE RENNES
A deck on crutches
Sogea Bretagne has completed the construction of the North
Viaduct of the future Val de Rennes, a 755 m long structure
whose construction got underway in July 1998 (architect:
Foster). The outstanding technical feature of this viaduct is
that its deck rests on 17 metal crutches which are between 3.5
and 4.5 metres high and weigh 30 tons each, a system which
took several months to design. In addition, Sogea teams were
forced to solve a difficulty related to the general profile of
the structure and the slope of the deck which is 10% in some
places. On both sides of the viaduct Sogea Bretagne also built
the access ramps which are 100 m long and lead to cut and
cover trenches for which Dodin was responsible.
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