Tanghai International Expert Service Center Leisure Center and Sports Arena Double-layer Membrane Structure Project. The Tanghai International Expert Service Center Leisure Center and Sports Arena project features a double-layer membrane structure, which is part of China's membrane structures. It uses PTFE membrane material, with a total area of 24,000 square meters, in the form of a skeletal membrane structure. Its shape resembles a shell, with large-span truss beams used longitudinally and reinforcement applied laterally. Between adjacent truss beams, steel cables are utilized longitudinally to press against the membrane surface, creating convex and concave shapes on the facade. This design is also applicable for mall membrane structures. (For inquiries, call 400-663-7757.)