Combined steel structure foundation pit support structure

A combined steel structure foundation pit enclosure structure comprises a waterproof curtain and supporting row piles, and the waterproof curtain and the supporting row piles jointly form a deep foundation pit closed type assembly enclosure system which integrates soil retaining and water stopping and is large in rigidity and high in bearing capacity. Components for supporting the row piles are assembled on the construction site. And after the foundation pit is used, the supporting row piles can be recycled for reutilization. The waterproof curtains are three-axis cement soil mixing piles, the supporting row piles are constructed through a resonance-free vibration hammer by means of a vibration sinking method, and the construction site is environmentally friendly and free of slurry pollution. According to the utility model, the defects of the existing row pile or underground diaphragm wall foundation pit support structure are overcome, and the green development and industrial construction of deep foundation p