INSTABILITY OF MOBILE CRANES DUE TO PENETRATION OF OUTRIGGERS

Abstract

Overturning of mobile cranes frequently occur on construction sites. Investigation of these accidents confirmed that one cause of the accidents is penetration of the outriggers into the ground. From the above point of view, this paper examines the result of bearing capacity tests on model ground. Both strength and deformation characteristics for the partially saturated ground are investigated. Furthermore, a theoretical stability analysis is developed by both static and kinetic formulations. The results indicate that penetration of the outriggers into the ground (i. e. depth of penetration and its speed) greatly influence the stability of mobile cranes.