SEWER JOB USES RECORD MOLE

Japanese contractors will be using the world's largest-diameter pressurized slurry shield tunnel boring machine to cut a stormwater detention tunnel. Bentonite slurry is pumped into a bulkhead behind the machine's rotating turret at a constant pressure higher than the water pressure of the surrounding strata. The slurry prevents the soil from collapsing and the water from infiltrating at the face. The slurry is then pumped out of the bulkhead with the spoil to the rear of the machine for separation. The bentonite is recycled back to the bulkhead and the spoil is piped to the surface in slurry form.

• 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: 1984-3

Media Info

• Pagination: p. 19
• Serial:
  • Engineering News-Record
  • Volume: 212
  • Issue Number: 12
  • Publisher: McGraw-Hill, Incorporated
  • ISSN: 0891-9526

Subject/Index Terms

• TRT Terms: Applications; Bentonite; Bentonite slurry; Boring; Detention; Detention basins; Drainage; Drainage practices; Sewers; Shields (Tunnels); Slurry; Storms; Tunnel borers; Tunneling; Tunneling machines; Tunnels; Tunnels by use
• Geographic Terms: Japan
• Old TRIS Terms: Shields (Tunneling); Slurries; Tunnels and tunneling
• Subject Areas: Bridges and other structures; Construction; Highways; Hydraulics and Hydrology; Research; Vehicles and Equipment; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00392604
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Apr 29 1985 12:00AM