The second part of an article on Immersed-Tube Tunnels continues a discussion on the design and construction of a circular steel-shell highway tunnel in which the shell is 10 M diameter and 8 cm thick with stiffening diaphragms. In addition to an internal concrete lining 450 mm thick the design also has external concrete comprising cap, keel and ballast concrete each side. Such tunnel units are usually some 90 M long and, after the addition of roadway slab and termil concrete, would have a freeboard of 300-600 M and a gross weight of some 9000 tonnes when launched. Criticisms of steel-shell construction lay in doubts concerning the integrity of the construction against water seepage and the difficulty in providing for flexing and movement within the structure. The author discusses the design features and advantages of constructing underwater tunnels by the concrete box method for the construction of rectangular section, multi-lane tunnels. See also IRRD Abstract No. 218311. /TRRL/

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  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
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  • Publication Date: 1976-3-4

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 91-98
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00138965
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 17 1976 12:00AM