Construction on Sangtian Island

Rail transit subway station renovation project, covered with steel structure decorative truss. The total construction area is 15314 square meters, with a grid expansion area of 18792 square meters. This project is an elliptical cylindrical mesh shell with a central column. It is a steel structure decorative mesh shell with one floor above ground and a building height of 21.190m. The connection form of the grid node adopts hub node, and the support adopts spherical hinge support. The maximum overhang length of the grid structure is 16m, the maximum span is 37.23m, the maximum installation height of the structure is 20.970m, and the total length of the grid structure is 229.36m. The grid members, steel columns, and stiffeners are Q355B, and the total weight of the structure is about 2800t. The minimum unit combination is hub node+single-layer grid structure. The entire grid is supported by lower peripheral supports and middle steel columns, with a total of 130 support points. There are 116 support points on both sides, with a spacing of about 3 meters between supports. There are 16 middle support points, and the middle support is a 530X16 steel pipe column with a column spacing of 14-24 meters. The roof adopts a double-layer air cushion transparent ETFE membrane structure. The design service life is 50 years, the seismic fortification intensity is 7 degrees, and the fire resistance level is Grade II above ground. The foundation adopts a raft foundation composed of "drilled pile+pier cap".