Public works . locked in position by means of thepivoted latch L at the end of the truss at A which canbe revolved by its projecting bent end and will pre-vent any displacement of the truss relative to the pile. If there is a clearance of more than 1/4-inch be-tween the hooks and the truss lower chord anglewhich they engage, it should be filled by wedgesdriven to bring all the hooks to uniform solid bear-ing. If the hooks fit accurately and uniformly aslight clearance will not be injurious. The pile can then be lifted to a horizontal positionby any convenient hoisting tackle connected to thece
Public works . locked in position by means of thepivoted latch L at the end of the truss at A which canbe revolved by its projecting bent end and will pre-vent any displacement of the truss relative to the pile. If there is a clearance of more than 1/4-inch be-tween the hooks and the truss lower chord anglewhich they engage, it should be filled by wedgesdriven to bring all the hooks to uniform solid bear-ing. If the hooks fit accurately and uniformly aslight clearance will not be injurious. The pile can then be lifted to a horizontal positionby any convenient hoisting tackle connected to thecenter of the top chord at C or by a bridle rope at-tached to the hoisting line, the ends of the bridlebeing attached to the connections at C and D. thusenabling the bridle to render freely through a sheavein its bight that supports it and permits the pile to berevolved in the bridle to any required position. The piles can thus be hoisted or lowered in a ver-tical position or lowered in a horizontal position for. ?ITEEL TRUSS ENGAGING HOOKSCAST INTO FACE OF PILE 410 PUBLIC WORKS Vol. 52, No. 22 storage or transportation, and when the hoist-Hne isslacked and the latch disengaged, the truss can be?displaced longitudinally far enough to maike theprojecting hooks register the full length of the slotsand the truss can be lifted off and removed quicklyand safely. To place the piles in the leads of the pile driver,the truss should then be again engaged with the pilehooks, locked into position and lifted either with thebridle or with two lines attached to points C and Dand line D operated while line C is overhauled untilthe pile assumes a vertical position and is swung toplace and lowered to bottom, when the trus caneasily be removed and used for handling another pileand so on. The section modulus of the piles should be calcu-lated, the moment of flexure computed for the sup-port of the piles at different points and the hooksshould be placed close enough to keep the maximumstresses down
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
