Foundation pit support of steel structure factory building

The utility model discloses a steel structure factory building foundation pit support which comprises a first step slope, a first single-row stirring pile, a first single-row jet grouting pile, a first prestressed pipe pile, a factory building foundation pit bottom structure, a second step slope, a second prestressed pipe pile, a second single-row stirring pile and a second single-row jet grouting pile. Soil layers on the two sides of the plant foundation pit can be reinforced through cooperation of the stirring piles and the jet grouting piles, meanwhile, due to the arrangement of the two slopes, excavation of the deep foundation pit can be achieved conveniently, and the structure of the prestressed pipe piles, the connecting beams and the like is combined; the method is suitable for foundation pit construction of a factory building including a basement in a complex soil structure with soil layers including a soil filling layer, a mucky soil layer, a medium sand layer, a silty clay layer and a mud rock layer