Pipe-lining a Pipeline

by Peter Douglass, Vice Pres.; Hart Crowser Inc., 1910 Fairview Ave., E. Seattle, WA 98102-3699,

Serial Information: Civil Engineering—ASCE, 1987, Vol. 57, Issue 12, Pg. 50-52

Document Type: Feature article


This core prestressed concrete cylinder pipe is now lining the inside of a major water supply tunnel in Alaska. Occasionally found in rock tunnels, or buried pipelines, large diameter, thin core prestressed concrete pipe has not been used 80 to 200 ft underground in a soil tunnel before. The 8,500 ft water supply tunnel is part of the $160 million Eklutna Water project which consists of a 32 mi gravity pipeline system, two energy recovery stations and one water treatment plant and clearwell. The new tunnel, with a 72 in. finished inside diameter channels water from Eklutna Lake to a new 6 mi long raw water pipeline and then on to a water treatment plant. Prestressed concrete cylinder pipe's durability, ease of installation and relatively low cost earned it the recommendation of the general contractor for the job. The liner includes a hydrostatically tested heavy welded steel cylinder with steel joint rings at both end. Sized for fast installation, the 24 ft pipe sections are connected by flush joint bell and spigot ends with double o-rings forming a watertight seal.

Subject Headings: Water treatment plants | Concrete cylinder pipes | Water pipelines | Concrete pipes | Tunnels | Prestressing | Prestressed concrete | Buried pipes | Alaska | United States

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