Improvement of the Deformed State of Flight Beams of Bridge Cranes

Abstract

Issues related to increasing the bearing capacity of the span beams of bridge-type cranes by the prestressing method are considered. A new constructive solution is proposed for unloading the main beams of the crane and studying their static stiffness at various places of temporary load position. An appropriate mathematical model of a bridge crane with prestressed beams has been developed, which is based on the general theory of stability of elastic systems. The equations of the curve of the beam deflections are obtained, on the basis of which the static stiffness of the main beam is studied, depending on the nature of the external temporary load. It has been established that the use of the proposed constructive solution allows to minimize curvature of the span when the cargo trolley is located above the support. The results of the work can be used to modernize cranes in order to increase their load capacity, extend their service life without dismantling, as well as to improve existing structures and engineering methods for their calculation.