Precast Liners May Cut Tunnel Cost 25%

by James D. Brown, (M.ASCE), Head; Tunnels Sect., U.S. Bureau of Reclamation, Denver, Colo.,
Kenneth D. Schoeman, (M.ASCE), Civ. Engr.; U.S. Bureau of Reclamation, Denver, Colo.,


Serial Information: Civil Engineering—ASCE, 1977, Vol. 47, Issue 11, Pg. 54-56


Document Type: Feature article

Abstract:

On the Bureau of Reclamation's Buckskin Mountain's Tunnel in Arizona, the low bid was for $58,000,000, about $21,000,000 less than the low bid for design using conventional lining. Key reason for the lower price: there's only one lining of precast concrete segments backed by gravel and grout. Conventional linings are essentially two linings, therefore boosting costs. The job is now about half way through a five year contract. Method of construction is described, as are the joint seals; do's and don'ts of precast liner design, casting and erection; and design assumptions in developing this new class of liner.

Subject Headings: Linings | Tunnels | Precast concrete | Construction methods | Bids | Benefit cost ratios | Pricing

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