A DESIGNER'S VIEWS: FUNCTIONAL REQUIREMENTS AND LIMITATIONS

The standardization of tunnel equipment is discussed, the potential for saving based on actual and theoretical costs for two tunnels is briefly analyzed, and comments are made on the possibility of adapting a machine to different diameters, and the potential cost saving with regard to linings. It is desirable to standardize the components performing the various functions of the tunnel boring machines, so that they are interchangeable between systems. The effect of standard-size tunnels on projected tunnel design is discussed. Estimates indicate that there is no clear-cut economic advantage in standardization of tunnel diameter. The possibility of adapting a machine to different diameters depends on whether it is a shield machine or a hard-rock machine. The design of tunnel linings will vary with the depth of the tunnel below ground surface and the quality of the ground. Depending on the purpose of the tunnel, similar design criteria may govern different tunnels and lead to standardization of design: metropolitan tunnels for transit systems; municipal tunnels for water supply and sewage disposal; tunnels shared by several utilities within the same conduit. In types of tunnel with no standardization potential with regard to size, economics could be effected by use of standard specifications for the operations involved in the procedure. Work schedule which ensured machinery movement in sequence from one tunnel to another would lead to savings; designers could ensure that station and ventilation shafts are scheduled. The development of a standardized tunnel lining system for the Bay Area Rapid Transit System is briefly described.

  • Supplemental Notes:
    • Report of a symposium conducted by Standing Subcommittee No. 5, International Activities of the U.S. National Committee on Tunneling Technology, held on May 21-22, 1974 in Washington, D.C.
  • Corporate Authors:

    National Research Council

    National Committee on Tunneling Technology
    Washington, DC  USA  20418
  • Authors:
    • Thon, J G
  • Publication Date: 1975

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Filing Info

  • Accession Number: 00127939
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 21 1981 12:00AM