Fort Benning, Georgia
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Fort Benning Directorate of Public Works
The military base at Fort Benning, Georgia, had an existing stream enclosure in need of a replacement. The enclosure consisted of 450 linear feet of double, 96” diameter corrugated metal pipe (CMP) that went beneath the on-ramp to I-185 and the Custer Road overpass. While the invert of the original pipe was still in good condition, one of the existing segments was failing due to a hole that had been placed in the pipe when it was installed in the early 1970’s.
The Fort Benning Directorate of Public Works (DPW) was concerned about replacing the existing stream enclosure. The pipe was located in about 30 feet of fill which would require extensive excavation and road closures on both I-185 and Custer Road. It would also cost approximately $800,000 to replace the structure, so alternative options were considered.
Contech Engineered Solutions suggested a reline solution to the Fort Benning DPW that would not only save them money but also keep the road from closing. Contech proposed lining the failing structure with Aluminized Steel Type 2 (ALT2) HEL-COR® corrugated metal pipe as it would use little of the available area and also preserve the maximum amount of the original opening. Due to the hydraulic efficiency, the smaller structure would provide the same hydraulic capacity as the original because of the low Manning “n” factors of HEL-COR.
Cline Services successfully installed 450 LF of 60”, 12 gage, 5 x 1 Aluminized Steel Type 2 HEL-COR for the reline solution in about one week.
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