A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Extruded Tunnel Lining System. Phase I: Conceptual Design and Feasibility Testing
The Extruded Tunnel Lining System (ETLS) has been conceived as a means of continuously placing the final concrete tunnel lining directly behind a tunnel boring machine. The system will shorten the time required to excavate and line a tunnel section, eliminate the need for primary supports, and thus significantly reduce the cost of tunnel construction. The scope of the program and its three phases are: Phase I: R&D - Resolution of basic technological problems; Phase II: System design, fabrication, and test; and Phase III: System modification, tests, and demonstration. This report describes the work completed during the first phase of the program. The report presents a state-of-the-art review of related construction practices, concrete technology, and tunnel liner design methods. The ETLS conceptual design is described. In addition, the results of a development program carried out to formulate a rapid setting concrete for use with the ETLS and a test program to demonstrate the ability to slipform and place that concrete under pressure in a closed form are presented. The ability to slipform a well consolidated slab of the rapid setting Very High Early Cement (VHEC) concrete was demonstrated. The slipformed concrete gained strength rapidly and was self-supporting approximately one hour after the initial addition of water to the concrete.
Extruded Tunnel Lining System. Phase I: Conceptual Design and Feasibility Testing
The Extruded Tunnel Lining System (ETLS) has been conceived as a means of continuously placing the final concrete tunnel lining directly behind a tunnel boring machine. The system will shorten the time required to excavate and line a tunnel section, eliminate the need for primary supports, and thus significantly reduce the cost of tunnel construction. The scope of the program and its three phases are: Phase I: R&D - Resolution of basic technological problems; Phase II: System design, fabrication, and test; and Phase III: System modification, tests, and demonstration. This report describes the work completed during the first phase of the program. The report presents a state-of-the-art review of related construction practices, concrete technology, and tunnel liner design methods. The ETLS conceptual design is described. In addition, the results of a development program carried out to formulate a rapid setting concrete for use with the ETLS and a test program to demonstrate the ability to slipform and place that concrete under pressure in a closed form are presented. The ability to slipform a well consolidated slab of the rapid setting Very High Early Cement (VHEC) concrete was demonstrated. The slipformed concrete gained strength rapidly and was self-supporting approximately one hour after the initial addition of water to the concrete.
Extruded Tunnel Lining System. Phase I: Conceptual Design and Feasibility Testing
B. J. Doherty (author) / D. W. Ounanian (author) / K. R. Maser (author)
1979
202 pages
Report
No indication
English
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