$1 BILLION SUBWAY BORES 9.7 MILES BENEATH BUSTLING CITY

The method described permitted the bulk of excavation to be completed quickly so tunneling from the site could begin before the station walls were in place. A hydraulic shield was used to drive the tunnels 2300 ft to the next station. Hard granite in other tube sections, however, required blasting. The line generally lies at a depth of 82 to 115 ft and along a maximum 3% grade.

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  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  USA  10036
  • Publication Date: 1976-12-23

Media Info

  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00152598
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 31 1977 12:00AM