The article gives some details of the civil engineering on A 260km twin track railway being built between Rome and Florence. The horseshoe-shaped twin tunnels of 4.72M internal radius were constructed by conventional methods using arch ribs and sprayed concrete as a temporary support before forming the 600-800mm thick concrete lining. Large steel plates, which could be thrust forward to protect the face, were hinged to the part of the shield for the difficult clay and bedded sand of the Cartiglione tunnel. Viaduct construction has been standardised as far as possible to simply supported prestressed concrete twin-box girders. From Settebagni northwards each span was constructed using three steel girders which could straddle the supporting piers carrying all formwork for a span enclosed in a weather protecting shed. Between Orte and Citta della Piere the 25 and 29M spans were precast in two line is designed for speeds of 250km/h and has a minimum horizontal radius of 3000M. /TRRL/

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 30-31
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00134061
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: ANALYTIC
  • Files: ITRD, TRIS
  • Created Date: Aug 23 1976 12:00AM