ELECTRIC TRICKERY

This article reports the use of a system of dielectric post-tensioning cables in the construction of a viaduct in Italy. The system protects cables against corrosion from electrochemical processes by insulating them from the surrounding structure. The bridge spans have a double-cell box girder cross-section and were precast: the reinforcing cage was fabricated from a template and cable ducts positioned and fixed using plastic connectors. Anchorages were placed, the internal dielectric trumpet connected to the duct, and the cable strands inserted. The cage was then positioned in the formwork and the slab reinforcement completed. All the cables were tensioned, the ends of the strands cut, and metal injection caps with translucent polyethylene dielectric caps inside were mounted on the strands with electrical connections to the cable. Vacuum injection grouting was carried out and the injection caps removed. Deck units were then launched using a girder. Measurement of the dielectricity in these prestressing cables will enable the health of the cables to be monitored.

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  • Authors:
    • PREVEDINI, C
    • AVERARDI RIPARI, F
    • DELLA VEDORA, M
  • Publication Date: 2004

Language

  • English

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Filing Info

  • Accession Number: 00988533
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Apr 4 2005 12:00AM