INVESTIGATION OF PORTAL CRANE FLOAT REQUIREMENTS, ARATU SHIP REPAIR CENTER, BRAZIL.
Final rept., 12 Jan-2 Feb 65,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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There is no mathematical technique for determining the design of portal crane track transition curves. A problem exists because of the geometry of the rigid frame crane in its relationship to the track on such a curve. This problem is one of providing correct limits to lateral movement of wheels float to accommodate to changing gage requirements. These changes occur as the crane progresses over the transition curve from straight track to another straight track or to a circular curve. At the point of circular curvature, the track gage reaches its extreme reduction and then remains constant. Gage requirements are different for front and rear trucks as the crane passes any given point on a transition curve. Solution of this problem for portal cranes to be used on proposed trackage at the Aratu Ship Repair Center, Brazil, revealed that a minimum of 1.1-inch inward and 5-inch outward float capability will be required. Author