Mobile work machine

Abstract

The invention relates to a mobile working machine, particularly an automatic concrete pump, having a chassis () designed as a tractor-trailer. The tractor-trailer comprises a tractor () and a multi-axle semi-trailer () supporting the working machine and connected to the tractor by means of a fifth wheel (). A support construction () that can be supported on a surface () is located in the area of the semi-trailer (). The support construction () comprises two front stabilizers (') and two rearward stabilizers (), each pivotable between a transport position and at least one support position relative to the semi-trailer. Means for raising and securing the tractor () are further disposed on the semi-trailer (), so that the tractor () forms a ballast weight for stabilizing the semi-trailer supported by the support construction () on the base () in the support position. According to the invention, the bearing points () of the front stabilizers (′) comprise a hollow space () through the center of the axis, and the means for raising and securing the tractor disposed on the semi-trailer () each comprise a lift member () extending through the central hollow area () of the bearing point () from top to bottom and releasably attachable to the tractor ().