Engineering and Contracting . ges and the upper ends of which wereclamped to the pipe by a heavy collar at apoint about 4 ft. above the block. On top ofthe pipe was a standard flange and below itwere two 6 in. x 8 in. timbers C ft. long run-ning parallel to each other and at oppositesides of the pipe. These timbers were boltedtogether and bolts running down through theflange kept them from slipping down. Acrossthe top of the 6x8s and spiked to them werelaid 3-in. planks 6 ft. long the whole forminga platform 6 ft. square. Holes were leftthrough the platform alongside the pipe toallow a chain t
Engineering and Contracting . ges and the upper ends of which wereclamped to the pipe by a heavy collar at apoint about 4 ft. above the block. On top ofthe pipe was a standard flange and below itwere two 6 in. x 8 in. timbers C ft. long run-ning parallel to each other and at oppositesides of the pipe. These timbers were boltedtogether and bolts running down through theflange kept them from slipping down. Acrossthe top of the 6x8s and spiked to them werelaid 3-in. planks 6 ft. long the whole forminga platform 6 ft. square. Holes were leftthrough the platform alongside the pipe toallow a chain to be passed around the pipe andup through platform to admit of the wholebeing lifted with a derrick. From the pipe di-rectly under the platform a ladder ran downto the concrete block and was fastened se-curely to both pipe and block. When this platform had been assembled itwas handled by a tower derrick mounted on a30 ft. X 60 ft. barge. A view of the derrickbarge handling the drill platform is shown in iZ-0- t- ao-rTT 15^==^. Fig. 2. Vertical Section BB of Fig. 1 anri were handled by one tow boat. The dis-tance of about 8 miles was covered in 2 hoursami minutes, the boat starting from NorthM;irkri St. .St at 10:30 a. m., and ar- Caisson for St. Louis Intake Tower. Fig. 9. This derrick was intended for use insetting stone, steel, etc., on the intake tower it-self. The timber tower was 30 ft. square andwas set 32 ft. above the deck of the barge. It 378 Engineering and Contraetino; Vol. XLi. No. 13, was built of 12x!2in. and 12x16 in. timbers andstrongly braced. On top of this tower a combinedA-frame and stiff leg derrick was erected witha 32-ft. mast and a 50-ft. boom. As the towerand derrick were set back about 12 ft. fromthe bow of the barge there was plenty of roomin which to place the drill platform when notin use or when changing from one hole to an-other. The holes for the upstream anchorswere drilled first and to drill them the der-rick boat was anchored with
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