Engineering and Contracting . asily pumped free and the caisson floated,drawing about 14 ft. of water which wasslightly more than calculated upon. Someparts of it were not caulked up to the watersurface and it was rolled first to one side andthen the other and the caulking carried prac-tically to the top before any additional tim-ber was added. This was accomplished byplacing a gin pole in each corner on thesame side with their bottoms resting on theriver bottom and a set of blocks leading fromtheir tops to the top of the crib. Lines fromthese blocks were then led to a hoisting engineand a str
Engineering and Contracting . asily pumped free and the caisson floated,drawing about 14 ft. of water which wasslightly more than calculated upon. Someparts of it were not caulked up to the watersurface and it was rolled first to one side andthen the other and the caulking carried prac-tically to the top before any additional tim-ber was added. This was accomplished byplacing a gin pole in each corner on thesame side with their bottoms resting on theriver bottom and a set of blocks leading fromtheir tops to the top of the crib. Lines fromthese blocks were then led to a hoisting engineand a strain taken. This, aided by the buoy-ancy of the crib itself, elevated that side ofthe crib from 3 to 4 ft. allowing the caulk-ing to be done, after which that side was al-lowed to settle down and the gin poles shiftedto the other side and it was handled thesame way. The construction on the caissonwas then resumed and the timber carried upto about 26 ft. above the cutting edge at whichtime it rested firmlv on bottom all Fig. 8. View of Portable Drill Platform withDrill IVIounted and Ready for Operation. The rock botn^in, as before stated, was ex-tremely uneven and the southeast corner was3 ft. higher than the northeast corner givingthe caisson a very bad twist. Also there wereIS in the bottom where the cuttingM be from 2 to 3 ft. clear of ,.Ill When the caisson had been com-pleted up to a point 2crminute capacity and as the twisting of the cais-son had caused the seams to open up, noheadway was made as the air leaked outabout as fast as the compressor could pump it 380 Engineering and Contracting Vol. XLI. No. 13. in. Clay filling was then dumped in the spacebetween the walls, on top of the deck whichwas a departure from the original schemewhich was to fill this space with sand as bal-last. The clay, however, acted as ballast andin additi
Size: 1431px × 1745px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
