Spiral Staircase Steel Stringer Detail With 250mm Slab CAD Drawing

This spiral staircase steel stringer detail with 250mm slab CAD drawing presents a comprehensive structural staircase design used in multi-floor building construction. The drawing includes detailed spiral staircase layouts for the basement, ground floor, first floor, and second floor levels with accurate step arrangement, stair curvature geometry, and structural framing coordination. The plan clearly illustrates stair core layout with SC1 to SC4 stair segments and connection points around a panoramic lift shaft. Structural components such as SHS 100x12 steel beams, solid slab thickness of 200mm and 250mm, and raft foundation thickness of 800mm are indicated to ensure safe load transfer and stability. Stair step numbering, circulation direction, and landing configuration are also detailed to guide architects and civil engineers in staircase planning and structural design coordination.