The 40 immersed-tube tunnels throughout the world, starting with the 1914 Michigan Central underwater connection between Detroit and Canada are discussed. Seven of the tunnels are for railroads or rapid transit lines. The immersed-tube tunnel is one where the structure is precast in large units of concrete or concrete and steel which are floated into position and generally laid in a trench dredged in the bed of the waterway. The waterway should have a stable, easily dredged bed; be adequately deep; be generally calm and have only moderate currents. The longest such tunnel is that of Bay Area Rapid Transit across San Francisco Bay.

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    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
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  • Publication Date: 1976-1

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Filing Info

  • Accession Number: 00130840
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 7 1976 12:00AM