Thickness Standards for Prefabricated Slab Houses
The thickness standards for prefabricated slab houses vary depending on the type and application scenario, with a common range of 60mm to 400mm, which needs to be determined comprehensively based on materials, loads, and design specifications. Here is a detailed classification description:
1. Ordinary Cement Prefabricated Floor Slabs
The thickness range is typically 60mm to 120mm, with span being the core influencing factor. For example, a 3-meter span recommends a thickness of 80mm to 100mm. The design load for residential slabs is generally 2-4kN/m², suitable for low-rise residences or temporary buildings. However, in some residential buildings, the thickness of ordinary prefabricated slabs may reach 120mm to 150mm to meet basic load requirements.
2. Steel Skeleton Lightweight Prefabricated Slabs
The thickness range is 80mm to 150mm, characterized by lightweight and high strength. For example, the steel skeleton lightweight slabs produced by Xuzhou Yaliyuan have a density of approximately 690kg/m³ and a compressive strength of 1.8MPa, supporting customized thicknesses and suitable for industrial plants, rail transit, and other scenarios with high fire protection requirements.
3. Reinforced Truss Prefabricated Floor Slabs
The thickness range is 100mm to 300mm, achieving large spans through truss structures (truss height 70-270mm), reducing steel usage by 60%-70%. Installation requires coordination with steel structural keels, with a recommended construction temperature of -5℃ to 40℃, suitable for large-span industrial or commercial buildings.
4. Special Scenario Requirements
- Split-level/Villas: Thickness of 150mm to 200mm to cope with large spans or special load requirements.
- Shopping Malls/Supermarkets: Thickness of 150mm to 200mm to withstand pedestrian traffic and goods stacking pressure.
- Industrial Buildings: Thickness in factories or warehouses is usually ≥180mm to meet heavy equipment or vibration requirements.
- Underground Garages: Thickness up to 300mm to 400mm, balancing compressive strength and waterproofing performance.
Design Considerations
- Load and Span: The live load for residences is generally 2.0kN/m², with an increase in thickness of 30mm to 50mm for every additional meter of span.
- Material Customization: 100mm thick prefabricated slabs are less commonly used but can be customized according to needs, with most manufacturers supporting adjustments as required.
- Regional Specifications: In northern freeze-thaw regions, the thickness of the frost-resistant layer needs to be increased, while coastal areas need to consider protection against chloride ion erosion.
- Standard Basis: Design should follow the "Code for Design of Concrete Structures" (GB 50010) and industry local standards to ensure structural safety.
