The objective of this report was to design, develop, fabricate, test and demonstrate a system for placing a continuously extruded tunnel liner. The Extruded Tunnel Lining System (ETLS) is a process for continuous slipforming of a concrete tunnel lining directly behind a tunnel boring machine. The program was carried out in three phases. This present report describes the results of the work conducted during Phases II and III (July 1979-June 1983). It includes the design, fabrication and evaluation of a full-scale, 10-foot diameter in an above ground tunnel test facility. The facility consists of: a 10-foot diameter, 22 foot long steel "tunnel"; an ETLS; a "TBM" reaction structure; and concrete mixing and pumping equipment. The ETLS consists of: a 9 foot diameter, 10 foot long, 1 in. thick steel cylindrical slipform; a 9.5 foot diameter, 8 in. wide by 6 in. thick independent annular bulkhead; hydraulic actuators controlling slipform and bulkhead motions; and an electro-hydraulic system for controlling the hydraulic actuators. The rapid set/rapid strength gain concrete mix design has been finalized to achieve 1-1/2 hr strength of 1000 psi while maintaining workability for 30 minutes. Tests of the ETLS have been carried out at advance rates of 4, 6, and 7 feet per hour. In all cases, a competent, self-supporting liner has been produced. Data acquired during these tests have provided a better understanding of the first underground system. Data acquired during these tests have provided a better understanding of the first underground system. Data have included mechanical loading on ETLS components due to form drag, buoyancy, and deviation from alignment; concrete pressures and concrete strength/time properties; and behavior of the ETLS control system. These have been incorporated into a conceptual design based on the information generated during this test program.

  • Supplemental Notes:
    • Phase I of this report is entitled: Extruded Tunnel Lining System, Phase I--Conceptual Design and Feasibility Testing, September 1979, NTIS No. PB 80-118011.
  • Corporate Authors:

    Foster-Miller Associates, Incorporated

    350 Second Avenue
    Waltham, MA  United States  02254

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Boyce, J S
    • Maser, K R
    • Ounanian, D W
  • Publication Date: 1983-12

Media Info

  • Pagination: 220 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00386297
  • Record Type: Publication
  • Report/Paper Numbers: UMTA-MA-06-0100-83-6Final Rpt., DOT-TSC-UMTA-83-50
  • Contract Numbers: DOT-TSC-1516
  • Files: TRIS, USDOT
  • Created Date: Jul 30 1984 12:00AM