Reinforcement detail drawing for a 13m span prestressed concrete bridge hollow slab with a 30° skew angle. The drawing shows both elevation and expanded face views with complete rebar specifications for a single middle slab component.
The design features high-strength low-relaxation prestressing tendons (φ15.2mm, 1×7 steel strand) with standard strength fpk=1860MPa and design strength fpd=1260MPa. The drawing includes a comprehensive reinforcement schedule detailing 22 different rebar positions with specifications for diameter, quantity, length, and total weight. Key components include:
Primary reinforcement elements:
– Prestressing tendons (items 1-4): 12 strands of φ15.2mm spanning 14,460mm
– Transverse reinforcement spacing: N9/N18 at 400mm, N10 at 500mm
– Various reinforcement bar sizes (φ6-φ12mm) strategically positioned throughout
The drawing includes specific technical notes regarding concrete strength requirements (85% of design strength minimum, 7-day minimum cure) before gradual prestressing release, and installation guidelines for hollow slab lifting using steel wire ropes. Total slab length is 12,900mm with applicable Highway Class I load standard.
