Method for determining the parameters of improved outriggers of self-propelled jib cranes

The practice of operating self-propelled jib cranes indicates their insufficient stability in the process of loading and unloading operations as a result of sub-sidence of supports in the ground. Evidence of this is the accidents of cranes as a result of their overturning, and the average statistical indicators of which have practically not changed over the past twenty years. The existing methods of increasing the bearing surface (shoes) of outriggers are characterized by a low production culture and are associated with high time costs and, as a result, leading to a decrease in productivity. The proposed fundamentally new development of the outrigger of a self-propelled jib crane, the shoe of which allows you to change the area of its bearing surface in conditions of uneven distribution of forces under the supports. The purpose of the work is to describe the design features, selection, evaluation of operating positions and the method of determining the parameters of the main structural elements of the proposed outrigger. The obtained dependencies make it possible to determine the ratio of the lengths of the links of the proposed design and change them depending on the type of bearing capacity of soils or the stroke of the hydraulic cylinder rod, which is equal to the width of the opening of the shoe elements with an increase in the area of their supporting surface hydraulic cylinder rod. The proposed shoe design is easy to manufacture and maintainable and allows you to increase the stability of lifting cranes, construction machines, etc. during loading and unloading and construction works.