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August-September, 2002 - Concrete mixing and transfer process; concrete pours at Pier 37.
Concrete for the bridge is mixed at this concrete batch plant, less than a mile from the bridge site.
Concrete is mixed and loaded onto trucks for transport to the bridge site. Each truck holds eight cubic yards of concrete.
Trucks back onto the Concrete Dock, where their loads are transferred to barges.
Trucks on the concrete dock pour their loads into a large hopper. The concrete falls through a large pipe, which guides it into buckets on the barge below.
A towboat takes the concrete buckets to the pour site.
Buckets are hoisted by crane from the barge into the caisson.
Workers guide concrete buckets into place, then pour or "place" the concrete where needed.
Workers guide concrete buckets into place, then pour or "place" the concrete where needed. On this day, a layer of concrete 10 feet (3m) thick is poured between the forms surrounding the caisson's dredge wells.