Engineering and Contracting . lower if the rockwas not considered suitable at that was finally excavated to about elevation 59and cleaned up ready for the masonry of theintake tower. The rock was drilled with IngersoU-RandJackhanier drills and shot w-ith very lightcharges of 40 per cent dynamite as it was de-sired to shake the crib as little as possible andat the same time it was necessary to leave aperfectly sound stratum of rock for thefoundation of the tower. The shooting merelyloosened the rock after which it was wedged Note L ines marked B used to anchor Derrick Bargewhen Pul
Engineering and Contracting . lower if the rockwas not considered suitable at that was finally excavated to about elevation 59and cleaned up ready for the masonry of theintake tower. The rock was drilled with IngersoU-RandJackhanier drills and shot w-ith very lightcharges of 40 per cent dynamite as it was de-sired to shake the crib as little as possible andat the same time it was necessary to leave aperfectly sound stratum of rock for thefoundation of the tower. The shooting merelyloosened the rock after which it was wedged Note L ines marked B used to anchor Derrick Bargewhen Pulling the Barge from under Coision and fast to Caisson stream end of the caisson and made fast to itwith steel cables. Steam and air lines on thecrib and on the barge were connected throughrubber hose in the case of the air and flexiblemetallic hose for the steam. Two derrick barges were also uSed, onebeing the high derrick with which the an-chors were set. On it was placed a Westing- 3-6«6«3 ConcrBlocks Engine. crgeNoS Notp :1b.) Double Blocks rove with/J Manilla ime and pried up, loaded in scale boxes, hoistedby the derrick barges and dumped on the decksof barges. These barges were then towedashore and unloaded. When the rock had been cleaned up readyfor masonry it was so late in the winter thatit was considered dangerous to continue was likely to start running at any limeand when that occurred it would be too lateto tie up the fleet in a safe place as that wasa weeks work in itself and in that time muchdamage might be done. High water was alsoimminent so it was decided to close down un-til after the spring floods had passed. Thework on the intake tower was therefore closeddown Dec. 29, 1913, and by Jan. 0, 1914, allplant had been removed from the crib andfrom the power barge and all the floatingequipment had been laid up in winter quarters. CONSTRUCTION PLANT. The plant used on this work consisted of apower barge 32x130 ft., on which were three60 HP. l
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
