A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The 7-mile long Flathead Tunnel in northwestern Montana was required in relocation of Great Northern Railway's main line track prior to impounding water by Libby Dam. Approximately 73% of the tunnel required structural steel tunnel sets for temporary support prior to the placement of concrete lining. A sliding floor, large special tunnel equipment, contractor initiated design changes to eliminate special trim and trench excavation, and laser survey alignment methods all contribute to a high speed excavation operation. Elimination of regularly spaced wall and arch contraction joints with waterstop through a value engineering proposal made a continuous lining operation possible. The conveyor placing system delivered concrete up to tunnel springline through form doors while the pump filled the tunnel arch.
The 7-mile long Flathead Tunnel in northwestern Montana was required in relocation of Great Northern Railway's main line track prior to impounding water by Libby Dam. Approximately 73% of the tunnel required structural steel tunnel sets for temporary support prior to the placement of concrete lining. A sliding floor, large special tunnel equipment, contractor initiated design changes to eliminate special trim and trench excavation, and laser survey alignment methods all contribute to a high speed excavation operation. Elimination of regularly spaced wall and arch contraction joints with waterstop through a value engineering proposal made a continuous lining operation possible. The conveyor placing system delivered concrete up to tunnel springline through form doors while the pump filled the tunnel arch.
Flathead Railroad Tunnel
Sacrison, Hans (author)
Journal of the Construction Division ; 97 ; 127-145
2021-01-01
191971-01-01 pages
Article (Journal)
Electronic Resource
Unknown
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