Unequal-height double-row pile foundation pit supporting structure system applied to subway construction

An unequal-height double-row-pile foundation pit supporting structure system applied to subway construction is used for greatly improving the lateral rigidity of an enclosure structure, so that lateral deformation of a foundation pit is effectively limited, and the safety of the foundation pit is guaranteed. Comprising front-row short fender posts and rear-row long fender posts which are longitudinally spaced and correspondingly arranged on the outer side of a foundation pit, and front-row pile top beams and rear-row pile top beams which connect the front-row short fender posts and the rear-row long fender posts into a whole are arranged on the pile tops of the front-row short fender posts and the rear-row long fender posts correspondingly; a connecting beam and a vertical inclined support are arranged between the corresponding front-row short fender posts and the corresponding rear-row long fender posts, the connecting beam is perpendicular to the axis of the rear-row long fender posts, the two ends of the c