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August-September, 2002 – Concrete mixing and transfer process; concrete pours at Pier 37. |
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Concrete for the bridge is mixed at this concrete batch plant, less than a mile from the bridge site. |
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Concrete is mixed and loaded onto trucks for transport to the bridge site. Each truck holds eight cubic yards of concrete. |
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Trucks back onto the Concrete Dock, where their loads are transferred to barges. |
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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. |
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A towboat takes the concrete buckets to the pour site. |
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Buckets are hoisted by crane from the barge into the caisson. |
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Workers guide concrete buckets into place, then pour or “place” the concrete where needed. |
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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. |
