SEATTLE PUTS BUSES UNDERGROUND

The article describes how contractors met the challenges of soil conditions when they bored a tunnel for a transit system of electrified buses. Contractors cut through 550 tiebacks from the foundation walls of high-rise buildings when constructing a 6,864-foot, twin-tube bus tunnel through the city's commercial center. Three quarters of the tunnel are bored; the end sections are cut-and-cover. The 5,100-ft-long bored section has tubes completely wrapped with waterproof membrane. It is the first tunnel in the U.S. in which jet grouting was done from inside. The difficult soil conditions resulted from densely packed soil from a 3,000-ft-thick glacier. The details are described of the improved waterproofing technique and the grouting.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08919526
• Corporate Authors:

  McGraw-Hill, Incorporated

  330 West 42nd Street
  New York, NY  United States  10036
• Publication Date: 1989-4-13

Media Info

• Pagination: p. 36-38
• Serial:
  • Engineering News-Record
  • Volume: 222
  • Issue Number: 17
  • Publisher: McGraw-Hill, Incorporated
  • ISSN: 0891-9526

Subject/Index Terms

• TRT Terms: Central business districts; Electric buses; Excavation and tunneling; Glacial soils; Grouting; Tiebacks; Tunneling; Underground structures; Waterproofing
• Geographic Terms: Seattle (Washington)
• Old TRIS Terms: Underground
• Subject Areas: Bridges and other structures; Construction; Design; Highways; Public Transportation; I25: Design of Tunnels;

Filing Info

• Accession Number: 00484063
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: May 31 1990 12:00AM