Large savings in time, costs and materials are claimed by a Belgian contractor in the construction of the 712 M long, 10 span viaduct using an incrementally launched prestressed concrete technique. The launching by sliding method, developed by professor Leonhardt, of Stuttgart, entails building short prestressed concrete box sections under controlled indoor conditions on the approach side of one abutment. Once the section is completed, it is launched across previously built piers and the next section built behind it before being launched in a similar manner. The same formwork can be continually re-used, and since a weekly cycle can be established, mistakes are few. Simulated factory conditions allow 24 hour all-weather operation and material transport distances can be drastically reduced because the manufacture is carried out within a small space. Temporary steel trestles have been installed where the distance between piers exceeds the recommended 65 M maximum. Hot mixing water, warmed aggregates and curing covers together with an electronic filament embedded in the concrete ensure that the -10 deg C winter air temperature does not interfere with construction. Vertical curves are incorporated in the structure, and a superelevated constant radius horizontally curved structure is being built in Italy using carefully designed formwork. (TRRL)

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 20-21
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00334133
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM