Rigging Design for Rebar Cage
Siefert Associates, LLC has been working with Pomerleau Construction, on the Annacis Island Wastewater Treatment Plant in British Columbia, CA. The project includes a 55ft diameter x 60ft tall concrete thrust block, below the river, designed to resist the force from a 12’-6” diameter x 90° elbow in the piping configuration. To support the construction schedule, Pomerleau chose to pre-fabricate the rebar cages in lieu of stick-building them in place. They chose Siefert as their construction engineer to analyze the stability of the enormous pre-fabricated cage while it was being built and when it was suspended from the hook and in its final position prior to the concrete pour. Siefert designed an internal stability system consisting of additional hoop reinforcement and X-bracing to strengthen and stiffen the rebar cage. Additionally, Siefert designed the rigging arrangement for the lift which consisted of custom lift lugs at [8] locations around the rebar cage circumference. The lugs were connected to specially designated pick-up bars; wire rope slings extended from the lugs to a series of W-shaped spreader bars below the crane hook.
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