Hydrogen sulfide corrosion has caused degradation and structural weakening of approximately 1/3 (4,000 feet) of the 11,922-foot long Chambers Creek wastewater tunnel in Tacoma, Washington. Most of the tunnel is lined with single gasketed, flush joint 72-inch reinforced concrete pipe (RCP) with a cast-in-place concrete cunnette in the invert. This part of the tunnel was mined using tunnel boring machines. The upstream end of the project, approximately 2,500 feet long, was constructed using cut-and-cover methods and is lined with double gasketed, bell & spigot joint 54-inch RCP. One short creek crossing at the Charles Wright Ravine consists of rusting steel pipe suspended over the creek. A manned and video inspection was conducted in September, 1998 to identify the extent of corrosion in the tunnel and perform testing. Corrosion was observed approximately 4,000 feet upstream of the downstream end of the tunnel. Rehabilitation options have been developed and include slip lining or replacing the lower 3,000 feet of the tunnel and placing a protective epoxy coating on the tunnel further upstream. This paper discusses the unique nature of tunnel inspection and rehabilitation as well as the inspection and condition assessment of the Chambers Creek Tunnel is also presented.
Tunnel inspection and rehabilitation for H2S corrosion
1999
15 Seiten
Aufsatz (Konferenz)
Englisch
Tunnel Rehabilitation of Tunnel Structures
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