The Bilbao metro's underriver crossing at Olabeaga was executed using the immersed tunnel technique. The elements of the tunnel were prefabricated in a provisional dry dock which formed part of the future land tunnel. The presence of competent rock at bed level enabled sand injections to be replaced by discrete concrete supports, acting as keelblocks. Microconcrete-injected sacking bags were used to make the required bed adjustments. River traffic immediately above the tunnel, including vessels up to 10,000 DWT, remained uninterrupted throughout the operations. (A) For the covering abstract see IRRD E101472.


  • English

Media Info

  • Pagination: p. 367-72

Subject/Index Terms

Filing Info

  • Accession Number: 00767001
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 3-85748-096-3
  • Files: ITRD
  • Created Date: Aug 2 1999 12:00AM