Construction method of foundation pit supporting system with inclined strut piles

The invention discloses a construction method of a foundation pit supporting system with diagonal bracing piles, which comprises the following core steps of: placing a pile machine chassis on a leveled site, and driving a main jack to adjust and lock the inclination angle of a guide frame; a mounting frame of the pile machine core component is in sliding fit with a guide rail of the guide frame through a main hoop; the upper end of the prefabricated core pile extends into a hydraulic clamp to be clamped, the upper end of a drill rod penetrates through a center hole of the prefabricated core pile and is in threaded connection with an output shaft of a power head, and the lower end of the drill rod extends out of a lower opening of the prefabricated core pile; the drill rod is sleeved with a limiting disc; driving the power head to obliquely drill the drill rod and jet-grouting the high-pressure cement paste to form a high-pressure jet-grouting pile; and meanwhile, a winch is started, and the core part is press