Cliffside Correction

by Stephen Keith Davis, P.E., (M.ASCE), Proj. Mgr.; Black and Veatch LLP, Latin American Division, Miami, FL,
Clinton O. Robinson, P.E., (M.ASCE), Vice Pres.; Black and Veatch LLP, Latin American Division, Miami, FL,
Rodrigo Caro Cordero, P.E., Partner; Cade-Idepe, Santiago, Chile,

Serial Information: Civil Engineering—ASCE, 1998, Vol. 68, Issue 8, Pg. 48-51

Document Type: Feature article


Construction of a 10 km sewer collector in Valpara�so, Chile, came to a halt due to construction difficulties experienced during pipe jacking operations. Analysis revealed not only construction challenges but also a serious potential for sedimentation in the pipeline. The recommended solution�moving the collector and the treatment plant�represents a significant departure from the original design. The new alignment eliminated a 3 km siphon, thereby returning the hydraulics to open channel flow and changing the construction method from pipe jacking to hard rock tunneling. Even more significantly, the new deep rock tunnel alignment now terminates on the far side of the city where steep cliffs meet the ocean. At this location, a 6 m�/s pumping station is being constructed in a rock cavern followed by treatment facilities on a platform of reclaimed land at the ocean's edge. Treated effluent will be discharged via a 300-m-long submarine outfall.

Subject Headings: Rocks | Construction management | Pumping stations | Open channel flow | Jacking | Construction methods | Alignment

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