SEGMENTAL TUNNEL LINING MEETS 'BUY AMERICAN'

It is described how, faced with a demand to 'buy American,' engineers designed a better segmental lining for sections of the Washington, D.C. subway. The 4-mile, single-pass, bolted and gasketed segmented concrete lining marks a new state of the art in U.S. tunneling technology. It provides circular tunnels 16 ft 8 in. i.d. and 18 ft 4 in. o.d. Seven segments, including a key, combine to form one 4 ft wide coffered tunnel lining ring. Construction is advanced ring by ring behind a tunnel boring machine. The systems advantages are described and include the following: eliminates the need for temporary tunnel support; and bolted design ensures safety during construction in non-uniform or water bearing ground. The segments are designed to withstand handling, erection, earth loads and water pressure. Details of production and logistics are summarized. Directions for future research are indicated.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
• Authors:
  • Irshad, M
• Publication Date: 1989-10

Media Info

• Features: Figures;
• Pagination: p. 59-61
• Serial:
  • Civil Engineering
  • Volume: 59
  • Issue Number: 10
  • Publisher: American Society of Civil Engineers
  • ISSN: 0885-7024
  • Serial URL: http://www.pubs.asce.org/ceonline/newce/html

Subject/Index Terms

• TRT Terms: Research; Safety; Segmental construction; Tunnel lining
• Subject Areas: Bridges and other structures; Highways; Research; Safety and Human Factors; I20: Design and Planning of Transport Infrastructure;

Filing Info

• Accession Number: 00488920
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 31 1989 12:00AM