Architect and engineer . four side spans will be1 160 feet each. The base of the center anchorage willbe 92 feet by 197 feet and will extend 180feet below water and 300 feet above water. On Yerba Buena Island the cables ofthe West Bay suspension bridge will beconnected to steel eyebars which will beplaced in inclined tunnels extending 200feet into the rock of the island. These tun-nels will be filled with concrete, anchoringthe eyebars in place. East of the cable anchorage on YerbaBuena Island the double deck roadway ofthe bridge will pass through the largestvehicular tunnel in the world, the
Architect and engineer . four side spans will be1 160 feet each. The base of the center anchorage willbe 92 feet by 197 feet and will extend 180feet below water and 300 feet above water. On Yerba Buena Island the cables ofthe West Bay suspension bridge will beconnected to steel eyebars which will beplaced in inclined tunnels extending 200feet into the rock of the island. These tun-nels will be filled with concrete, anchoringthe eyebars in place. East of the cable anchorage on YerbaBuena Island the double deck roadway ofthe bridge will pass through the largestvehicular tunnel in the world, the borebeing 76 feet wide by 58 feet high and540 feet long. The island section of the bridge, includ-ing the tunnel, and the east and west ap-proaches to the tunnel, totals 2,950 feet. The East Bay sector of the bridge con-sists of a 1400-foot cantilever span—thirdlongest in the world—joined on either sideto two 510-foot anchor arms. East of the cantilever and anchor-armstructure are five 509-foot through truss ^ 45 ?. HZ .CO 5h OX ^S — < a<go S^ <&: zx a3< Oh zj ^gg apg ^z^ fe-n-°^-§z >S ^^^ Q ,HU< < f- M U THE ARCHITECT AND ENGINEER ^ 46 ^ NOVEMBER, NINETEEN THIRTY-THREE spans, and fourteen 291-foot deck trussspans. The bridge reaches ground level nearthe outer end of the Key Route fill wherethe lower deck is forked so that the upperdeck comes down between the interurbantracks and heavy truck lanes. The roadways at the Oakland shoredivide into three branches, one for eachof the main East Bay cities. The terminiof these three branches are at Seventh and No. 24) has now been completed by thesteel sheet piling cofferdam method. Inter-locking sheet piling was driven in a rec-tangular stockade formation and into thisstockade, 52 by 122 feet in area, some 21,-000 cubic yards of concrete was poured inthe wet by means of a bottom dump this monolith of concrete will beerected the most westerly tower of thebridge, 465 feet high from its base, and40
Size: 1008px × 2479px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksub, booksubjectarchitecture
