Public works . FLOATIXG DERRICK AXD HOISTING TOWKR JIiJORED BETWEEX SERVICE TRACK AND BRIDGE distant in the clear from it to provide passage be-tween the bridge and the trestle for the contractorsfloating elevating tower. The concrete cars have hopper-bottom bodies withcylindrical side gates operated by hand levers. Eachis furnished with a short chute that delivers the con-crete to the hoisting tower for the river spans. This steel tower is 130 feet high and is installed on a 36x75 foot barge, seven feet deep. The top is braced bytwo stiff legs that may later serve also for steel booms100 feet
Public works . FLOATIXG DERRICK AXD HOISTING TOWKR JIiJORED BETWEEX SERVICE TRACK AND BRIDGE distant in the clear from it to provide passage be-tween the bridge and the trestle for the contractorsfloating elevating tower. The concrete cars have hopper-bottom bodies withcylindrical side gates operated by hand levers. Eachis furnished with a short chute that delivers the con-crete to the hoisting tower for the river spans. This steel tower is 130 feet high and is installed on a 36x75 foot barge, seven feet deep. The top is braced bytwo stiff legs that may later serve also for steel booms100 feet long. The tower is intermediately braced byfour smaller inclined struts and is equipped with abucket of 27-cubic feet capacity that is hoisted at aspeed of 180 feet per minute by the hoisting en-. VIEW OF IXSTALLATIOX OF PLAXT AXD June 17, 1922 PUBLIC WORKS 451 gine. The hoisting buckets empty automatically intoa vertically movable receiving hopper that sui)plies athree-section steel chute of the Insley type that issupported by shear legs and commands an area ofabout 100-foot width, that serves to deliver concreteto any part of the adjacent pier, arch rib, or super-structure. For the floor construction some of theconcrete was spouted to a movable elevated hoppersupplying hand carts at floor level. The hoisting tower can be shifted convenientlyfrom pier to pier and from span to span as the workprogresses, forming a very flexible connection be-tween the mixing plant and the concrete forms andis considered more convenient, economical and rapidthan a cableway or industrial track. An average force of about 30 men was recjuiredto trim the stock piles, operate the reclaiming derrickand the concrete mixer, handle cement, run the con-crete train and hoisting tower, o
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
