Engineering and Contracting . ery and all motors,rxccpt the end latch mnior, arc located onthe stationary part of the bascule, being placedin a shcct-stecl house having a reinforced^concrete floor. The bridge is operated froma twii-si.,ry house. 10x12 ft. in plan, wherethe controllers, switchboard andnicchaiiual interlocking stand arc placed. KRKCriON , The tower, including the two 2)-ft. towerpan, was erected by means of a ilerrick-carof 2i tons having a ..O-ft, rniinterwcight girders, the side plates andthe lower portion of counterweight trussc.*were r
Engineering and Contracting . ery and all motors,rxccpt the end latch mnior, arc located onthe stationary part of the bascule, being placedin a shcct-stecl house having a reinforced^concrete floor. The bridge is operated froma twii-si.,ry house. 10x12 ft. in plan, wherethe controllers, switchboard andnicchaiiual interlocking stand arc placed. KRKCriON , The tower, including the two 2)-ft. towerpan, was erected by means of a ilerrick-carof 2i tons having a ..O-ft, rniinterwcight girders, the side plates andthe lower portion of counterweight trussc.*were raised into position by means of thencrrick-car. assisted by a guy-derrick, which*»« placed on the machinery floor about 27{•• ••Iove the deck. This guy-derrick had aIw-ft. tnast and a f)0-ft. boom, and couldnatidlc. alone, the heaviest piece, whichWeighed about tons. It was not called tion) that the movable leaf portion, whichwas erected in front on the main trunnion,was not disturbed during the insertion of the. Fig. 2. Lift Span Practically Completed in Position—View Also Shows Fixed Span. two coimtcrwcight links. The movable leafwas erected in a nearly vertical position, itsaxis being only 7° 30 from the the counterweiRht trusses and about on the opposite side. From this cable therewas suspended a rectangular wooden chutefor spouting the concrete into place. It wasfound that the most desirable slope for this 440 Engineering and Contracting Vol. XLI. No. V: chute was 1 to 3%, as the coarse aggregatedid not run away on this slope. The bot-tom and sides of the chute were built ofsurfaced fir planks. The skip was hoistedby means of a So-HP. electric motor, and theconcrete mixer was operated by a Barring delays, about 40 %-cu. of concrete per hour could be mixedand placed by the concreting plant. The movable leaf was erected by two addi-tional jumps of the guy-derrick. Figure 2shows a view of the lift span practicall
Size: 2001px × 1249px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
