Longitudinal sliding mode protection trolley for maintenance operation of T-beam bridge sidewalk structure

The invention discloses a longitudinal sliding mode protection trolley for maintenance operation of a T-beam bridge sidewalk structure, and relates to the technical field of bridge maintenance equipment. The longitudinal sliding mode protection trolley comprises a pulley assembly, wherein a protection trolley is connected through the pulley assembly; the pulley assembly comprises a fixing frame; the fixing frame is rotationally connected with a row of guide wheels; the fixing frame is symmetrically provided with two rows of limiting wheels relative to the guide wheels; L-shaped clamping platesmatched with L-shaped supports are symmetrically arranged on the fixing frame; the protection trolley comprises a rectangular frame; the rectangular frame is connected with a corrugated plate; the rectangular frame comprises two transverse edges and two longitudinal edges; one transverse edge is matched with the guide wheel, and one opposite side surface of the transverse edge is propped againstthe limiting wheel; and th