Trackless overhead line system ladder trolley suitable for tunnel

The utility model discloses a trackless catenary ladder vehicle suitable for a tunnel, which relates to the technical field of tunnel construction and comprises a top plate, a ladder frame is arranged on the top plate, side wings are oppositely arranged on two sides of the top plate, connecting plates are rotatably arranged at the bottoms of the side wings, and hubs are oppositely arranged on one sides of the connecting plates on the two sides in the approaching direction; the ladder assembly can be supported through the top plate, and the connecting rod can pull the connecting plate to rotate through the hydraulic rod, so that the angle of the hub can be changed, the hub is matched with a new cross section, and the ladder assembly is convenient to use. In this way, the equipment does not need to advance along a fixed rail and can freely run on arc-shaped, horseshoe-shaped, rectangular and other tunnel sections, the main body structure of the outer frame is a trapezoid, the structure can be more stable throug