Pathologie et renforcement du pont de Saint-Nazaire

Pathology and strengthening of the Saint-Nazaire bridge

Aujourd'hui certaines poutres VIPP des tabliers des viaducs d'acces du pont de Saint-Nazaire - Saint-Brevin presentent des defauts affectant les fils de precontrainte, certains etant rompus suite a la corrosion par les chlorures en raison d'enrobage insuffisants. Un renforcement structurel de l'ensemble des poutres du viaduc d'acces sud par precontrainte additionnelle isostatique est ainsi necessaire. Pour realiser les travaux de renforcement, l'entreprise a concu des pontons flottants servant aussi de plateforme de travail une fois hisses sous les traves. ABSTRACT IN ENGLISH:At present, certain independent prestressed beams of the decks of viaducs leading to the Saint-Nazaire - Saint-Brevin bridge have defects affecting the prestressing wires, some of which have broken due to stress corrosion. Structural reinforcement of all the beams of the southern approach viaduct by additional isostatic prestressing is therefore required. Nature of works: - performance of external prestressing, - surface preparation and application of a corrosion inhibitor on the surface of the existing heel, - strengthening of the heel by HA 40 bars coated with tied concrete on the heels, - execution of reinforced concrete anchoring foundations at the ends, - execution of two reinforced concrete deviators 1 m long to absorb the cables' angular deviation forces, - reinforcement against shear force by installing strips of bonded composite materials, - installation of a coating for protection of the concrete cladding over the entire surface of the beams. To perform the strengthening works, the contracto designed floating pontoons also serving as a work platform after being hoisted under the spans.

  • Availability:
  • Authors:
    • Griaud, Philippe
    • Lanquette, Francis
    • Vilar, Paul
    • Robert, Tony
    • Jeunehomme, Arnaud
  • Publication Date: 2013-5

Language

  • French
  • English

Media Info

  • Media Type: Print
  • Features: Illustrations;
  • Pagination: pp.37-43
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01485581
  • Record Type: Publication
  • Source Agency: Belgian Road Research Centre (BRRC)
  • Files: ITRD
  • Created Date: Jul 3 2013 4:22AM