DEVELOPMENT OF AN EXTRUDED TUNNEL LINING SYSTEM
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.
- 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.
Foster-Miller Associates, Incorporated350 Second Avenue
Waltham, MA United States 02254
Urban Mass Transportation Administration400 7th Street, SW
Washington, DC United States 20590
- Boyce, J S
- Maser, K R
- Ounanian, D W
- Publication Date: 1983-12
- Pagination: 220 p.
- TRT Terms: Concrete structures; Extrusion; Ground handling; Slip form pavers; Structural design; Tunnel lining; Tunneling machines; Tunnels
- Uncontrolled Terms: Tunnel design
- Old TRIS Terms: Ground support; Slip forms
- Subject Areas: Aviation; Bridges and other structures; Construction; Design; Highways; Public Transportation; I25: Design of Tunnels;
- 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