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Airplane View . . . San Francisco-
Oakland Bay Bridge
HE 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 are cellular concrete piers
formed within caissons floated by false bottoms, and four are
entirely original designs of 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 diam-
eter 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.
PICTURE No. 10-E
PUB, BY J. C. BARDELL
SAN FRANCISCO, CALIFORNIA
