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Senlan Plot A4-2

The Senlan International Community Commercial Building A4‑2 project is located in the Senlan area of Shanghai’s Waigaoqiao Free Trade Zone. The main structure comprises five above‑ground floors, housing commercial spaces, community services, and sports facilities, while the three underground levels accommodate two levels of retail space and a three‑level parking garage. For this project, static‑pressure pipe piles are used for the two‑story section, whereas bored cast‑in‑place piles are employed in the three‑story section. The excavation pit covers an area of 33,118 m², with depths ranging from 11.3 to 16.65 m. Sequential full‑pit excavation is adopted. In the second basement level, the retaining system consists of row piles combined with triple‑axis jet grouting cutoff walls and two horizontal concrete bracing members. In the third basement level, the design features a diaphragm wall (with rubber waterstop joints), triple‑axis jet grouting wall reinforcement, and three horizontal concrete bracing members. In areas with elevation differences, the retaining system utilizes bored cast‑in‑place piles together with an ultra‑long triple‑axis cement‑soil jet grouting cutoff wall.

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