SWINGING BODY MAIN FRAME STRUCTURE FOR CONSTRUCTION MACHINE

PURPOSE:To facilitate the piping of a mounted engine by arranging a pair of flange sections to the outside, and widening the spaces in U-shaped members formed from a single plate as a tail frame to be fitted to a main swinging frame. CONSTITUTION:A tail frame 20 to be mounted with an engine and the like is fitted to a main swinging frame 10 installed with a working machine and a driver's seat to form a swinging body frame 100. The tail frame 20 is constituted of members 21, 22 folded into a U-shaped cross section from a single plate, and at least flanges 21b, 22b are stretched to the outside. The height H1 is made higher and spaces A, B are made wider than when an H-shaped steel is used, and an oil pan OP can be deeply inserted between the frame members 21, 22. Various pipes and harnesses can be easily arranged without changing the height of the engine.