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A platform for research: civil engineering, architecture and urbanism
Lessons Learned from Rehabilitation of Multiple 150-in. Diameter Siphons
Northern Colorado Water Conservancy District (Northern Water) operates the Hansen Feeder Canal as part of the Colorado-Big Thompson Project, designed and constructed in the 1950s by the United States Bureau of Reclamation (USBR). Over its 12-mi length, the canal traverses several roadways, drainages, and highpoints using a combination of inverted siphons and tunnels. The Maitland Siphon is a 12.5-ft inside diameter reinforced concrete inverted siphon located west of Loveland, Colorado, that conveys water under an intermittently flowing natural drainage/creek. Northern Water performed a condition assessment on the Maitland Siphon in 2012 utilizing visual inspection and several non-destructive testing technologies. They grew concerned with cracking observed in a 2015 inspection and engaged our firm to review the previous work, perform additional assessment, and develop rehabilitation alternatives. The siphon was determined to be structurally compromised, most likely from external overloading. Rehabilitation options were developed and a steel slipline approach was recommended and accepted. The 140-in. diameter slipline rehabilitation constructed in 2017. Northern Water later identified the 150-in. diameter Cottonwood Siphon as a priority and determined it to also be structurally compromised. A 142-in. diameter steel slipline was designed and constructed in 2020. The design and construction of these two sequenced projects offered many unique insights and lessons learned for very large diameter concrete pipelines, including rehabilitation methodologies, unconventional slipline geometries, and how “ one-off” designs can be evolved and improved for additional similar applications.
Lessons Learned from Rehabilitation of Multiple 150-in. Diameter Siphons
Northern Colorado Water Conservancy District (Northern Water) operates the Hansen Feeder Canal as part of the Colorado-Big Thompson Project, designed and constructed in the 1950s by the United States Bureau of Reclamation (USBR). Over its 12-mi length, the canal traverses several roadways, drainages, and highpoints using a combination of inverted siphons and tunnels. The Maitland Siphon is a 12.5-ft inside diameter reinforced concrete inverted siphon located west of Loveland, Colorado, that conveys water under an intermittently flowing natural drainage/creek. Northern Water performed a condition assessment on the Maitland Siphon in 2012 utilizing visual inspection and several non-destructive testing technologies. They grew concerned with cracking observed in a 2015 inspection and engaged our firm to review the previous work, perform additional assessment, and develop rehabilitation alternatives. The siphon was determined to be structurally compromised, most likely from external overloading. Rehabilitation options were developed and a steel slipline approach was recommended and accepted. The 140-in. diameter slipline rehabilitation constructed in 2017. Northern Water later identified the 150-in. diameter Cottonwood Siphon as a priority and determined it to also be structurally compromised. A 142-in. diameter steel slipline was designed and constructed in 2020. The design and construction of these two sequenced projects offered many unique insights and lessons learned for very large diameter concrete pipelines, including rehabilitation methodologies, unconventional slipline geometries, and how “ one-off” designs can be evolved and improved for additional similar applications.
Lessons Learned from Rehabilitation of Multiple 150-in. Diameter Siphons
Parks, Randall (author) / Spencer, Joel (author) / Shaw, Landon (author)
Pipelines 2021 ; 2021 ; Virtual Conference
Pipelines 2021 ; 123-133
2021-07-29
Conference paper
Electronic Resource
English
Rehabilitation of Siphons in Sewer Systems Using the CIPP Technology
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