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The Flathead Tunnel. A Geologic, Operations, and Ground-Support Study, Burlington Northern Railroad, Salish Mountains, Montana
The 7-mile Flathead Tunnel located in the central Salish Mountains of northwestern Montana was constructed between 1966 and 1969. With the contract awarded April 19, 1966, tunnel excavation began September 30, 1966, and was completed June 21, 1968, in 488 tunnel driving days. Peak advance was 66 feet per day. On June 27, 1969, 53 weeks following 'holing through', all tunnel concrete lining was completed. Average wall and arch concrete placing rates exceeded 1700 cubic yards daily. Much of this outstanding tunneling progress can be directly attributed to specialized construction equipment. Operations were distinctly conducive to seasonal construction and decidedly influenced job schedules. The Flathead Tunnel was successfully completed within contract time, with major cost savings in concrete tunnel lining achieved through a value engineering clause in the contract.
The Flathead Tunnel. A Geologic, Operations, and Ground-Support Study, Burlington Northern Railroad, Salish Mountains, Montana
The 7-mile Flathead Tunnel located in the central Salish Mountains of northwestern Montana was constructed between 1966 and 1969. With the contract awarded April 19, 1966, tunnel excavation began September 30, 1966, and was completed June 21, 1968, in 488 tunnel driving days. Peak advance was 66 feet per day. On June 27, 1969, 53 weeks following 'holing through', all tunnel concrete lining was completed. Average wall and arch concrete placing rates exceeded 1700 cubic yards daily. Much of this outstanding tunneling progress can be directly attributed to specialized construction equipment. Operations were distinctly conducive to seasonal construction and decidedly influenced job schedules. The Flathead Tunnel was successfully completed within contract time, with major cost savings in concrete tunnel lining achieved through a value engineering clause in the contract.
The Flathead Tunnel. A Geologic, Operations, and Ground-Support Study, Burlington Northern Railroad, Salish Mountains, Montana
E. H. Skinner (author)
1975
106 pages
Report
No indication
English
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