This viadust crosses the valley of the River Sil and forms part of the plan of access to Galicia. Conditions of the valley and the basin created by a dam, have made it necessary to construct a viaduct 260 M long resting on two piers separated by a central span of 130 M. The viaduct is constructed on rock of a granitic type. The proximity of the dam has made it necessary to use a system of controlled blasting in the excavation of the piers and the abutments. It has also been necessary to construct a screen on the left bank in order to ensure stability. The viaduct has been constructed by means of the successive cantilevering method, the box girders being concreted "in situ". The deck is simply supported on the piers, so that it was necessary to construct a steel tower anchored on one of the supports in order to fix the deck and to ensure that it did not tilt during construction. The abutments were first concreted and two piers were constructed. Then the first half of the deck was constructed starting from one of the piers, whilst moving the two advancing carriers and concreting simultaneously in both directions. The process was repeated starting from the other pier and finally the central box girder was concreted, and the cables at the base of the deck were tensioned. High-strength concrete was employed with siliceous aggregate and washed limestone sand. An aerial cableway was used to transport the concrete to all points on the deck. A concreting plant located on the site itself, ensured that there was no loss in quality of concrete due to transporting. The construction of the piers and the deck was completed over approximately 16 months. (TRRL)

  • Availability:
  • Corporate Authors:

    Springer Verlag

    175 5th Avenue
    New York, NY  United States  10010
  • Publication Date: 1977-2


  • Spanish

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 35-39
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00309207
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: May 21 1980 12:00AM