Construction Innovation The Millau Viaduct Deck Launch

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					Construction Innovation:
The Millau Viaduct Deck
        Launch




                   Paul Eliasson
                  Brian Follweiler
          The Millau Viaduct
• Recently completed
  Cable-Stayed bridge in
  Southern France.
• Built to span the
  plateaus of the Tarn
  Valley.
• Boasts the highest
  bridge pylons in the
  world. The deck rises
  1,125 ft above the
  ground.
      Construction Overview
• Temporary piers used
  to help launch and
  support the deck as the
  the pylons were
  constructed.
• The 2460m deck was
  launched in two pieces.
• Pylons and cables were
  added on top of the
  piers.
           Deck Launching
• 7 temporary piers
  help support the
  weight of the deck.


• 2 deck segments
  are launched from
  the each end of the
  bridge.
       Hydraulic Launchers
• Computerized
  launchers push the
  pre-fabricated deck
  segments onto the
  piers.
• Each cycle moves
  the deck 600mm.
  Total of 5000 cycles
  required.
            Nose Recovery
• Weight of steel box-
  girder deck sags as
  span is completed.
• Nose recovery
  system attached to
  raise the deck to the
  level of the next
  pier.
              Completion
• Two deck segments
  joined in May of
  2004.

• Opened to traffic on
  December 16, 2004.
  This new route
  shaves 60km off the
  Paris-Barcelona
  route.