Architect and engineer . HITECT AND ENGINEER ^ 47 ? NOVEMBER. NINETEEN THIRTV-THREE pounds per square foot pressure for buoy-ancy. Around the cylinders within thetimber walls the concrete is placed and thecaisson is sunk, by the method of alter-nately raising the height of the walls andloading it with concrete, and pumping airinto the cylinders to increase the this caisson reaches the bay bottomthe domes will be removed and clamshelldredges will excavate the earth from be-neath the caisson by removing the earththrough the dredging wells. Once landed on rock, sufficient concretei
Architect and engineer . HITECT AND ENGINEER ^ 47 ? NOVEMBER. NINETEEN THIRTV-THREE pounds per square foot pressure for buoy-ancy. Around the cylinders within thetimber walls the concrete is placed and thecaisson is sunk, by the method of alter-nately raising the height of the walls andloading it with concrete, and pumping airinto the cylinders to increase the this caisson reaches the bay bottomthe domes will be removed and clamshelldredges will excavate the earth from be-neath the caisson by removing the earththrough the dredging wells. Once landed on rock, sufficient concreteis poured in the wells to bond the pour tothe rock, thus producing a cellular con-crete structure of unusual strength andlightness, taking into consideration thearea of its base. In the East Bay two false bottom flota-tion caissons are now being sunk west ofthe tip of the Key Route Mole. These cais-sons have timber false bottoms to providebuoyancy for floating, and this timber isremoved when the caisson lands on the bav. bottom and the caisson sinks through thesoil by the process of dredging out theearth beneath it through the dredging wells. These caissons have not the steel cylin-ders of the compressed air caissons butotherwise operate on the same principle. Sheet piling cofferdams are in construc-tion alongside the Key Route Mole for thepiers supporting the truss spans. The deepest pier of the bridge will belocated in the East Bay crossing where acaisson v/ill be sunk 235 feet below the sur-face of the water, establishing a worldsrecord for depth of concrete pier construc-tion. BAY BRIDGE NOTES BRIDGE CAISSON IM II ,1 M UIXL T]\r size of one of the dredg- ing wells in the di i> - -cd air flotation caLssons for the San Francisco-Oakland Hi\ 1. w be seen from comi>arison with the size of the men stamln _ .\ It Inn 11. of the cylinders. Left to right are: Chas. E. Andrew. bri<iK. ; E. J. Schneider. Columbia Steel Coni- pany; C. H. Piircell. chit f engin eer, San Francis
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