Airplane View... San Francisco-Oakland Bay Bridge

Jumbo/Large Format
4.75" x 6.25" (12.75 x 16 cm)
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The piers established new engineering records for depth below water and for speed and volume of the pouring of concrete. Of the 44 subaqueous piers, three were constructed by placing concrete under water within steel sheet piling coffer-dams. Thirty-four are concrete piers each resting upon from 300 to 625 8-foot fir piles. Three or cellular concrete piers formed within caissons with circular cells domed, air-tight and floated by aid of compressed air. These caissons were sunk through from 50 to 105 feet of water and landed on bedrock at depths ranging from 105 to 235 feet below low water. The largest of these caissons was that for the substructure of the concrete center anchorage, which has an area of 92 x 197 feet and contains five rows of eleven 15-foot diameter circular cells within the concrete pier formed by steel pipe welded in place on site in 20-foot sections and domed with steel hemispheroids during the floating period. These domes were burned off and rewelded on as sections of the 15-foot pipe were added during the process of building up the outer walls of the caisson and the inner cylinders, as concrete placed around the cylinders weighted the caissons down toward final elevation

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