Pump Station - Atlanta, Ga.
City of Atlanta
The Nancy Creek Pump Station is a wastewater facility built for the City of Atlanta, Georgia. In 2001, the general contractor on the project, Western Summit Constructors, experienced obstacles during the first phase of construction and began to explore strategies for project acceleration. They called on the expertise of Ibberson and inquired whether it was possible to build a 72-foot-diameter by 160-foot-deep underground shaft using slipform concrete construction methods.
The City of Atlanta and Western Summit Constructors reasoned that slipforming the shaft would reduce the overall project schedule by as much as three months. They were also convinced this method had other advantages over conventional concrete formwork. Slipforming would be much safer, and it offered a monolithically poured shaft that eliminated numerous cold joints that would result with conventional formwork.
This new slipform application created several unique challenges for our engineering and construction teams.
Prior to this project, Ibberson's slip-formed buildings such as grain storage silos, feed and flour mills, and other facilities were always built from the ground up. In the company's entire history, this would be its first slipformed concrete structure starting deep underground and stopping at ground level.