Civil Prefabricated Housing Design Specifications
The Civil Prefabricated Housing Design Specifications cover six core dimensions: structural safety, seismic performance, sound and thermal insulation, service life, fire protection, and specific requirements for rural self-built houses. The detailed specifications are as follows:
Structural safety is the foundation of prefabricated housing design. Prefabricated components must meet strict load standards. For example, the design live load for typical residential prefabricated floor slabs must not be less than 200 kilograms per square meter, and the dead load must include the self-weight of the slab and the weight of the facing layer. Ordinary prefabricated slabs are suitable for spans of 3-6 meters; spans exceeding this require special calculations and structural reinforcement. The ledge length must not be less than 10 centimeters, and effective connections must be used to ensure support stability.
Seismic performance must comply with the requirements of the 'Building Seismic Design Code'. Prefabricated structures must undergo integrity checks, and joint connection areas must be able to withstand repeated loads under design earthquake conditions. The 2024 regulations mandate that energy dissipation devices or redundant restraint systems be installed at the connection areas of prefabricated components to enhance structural ductility.
Sound and thermal insulation indicators directly affect living comfort. The airborne sound insulation of separating walls must be ≥50 decibels, and the impact sound pressure level of floor slabs must be ≤65 decibels, typically achieved through the use of elastic pads or floating floor structures. Thermal insulation performance must be combined with building insulation design to ensure compliance with local energy efficiency standards.
In terms of service life, the design service life of prefabricated residential buildings in ordinary climate zones is 50 years, but structural inspections must be conducted every 10 years. In coastal areas with high salt spray or northern regions with frequent freeze-thaw cycles, the service life must be reduced by 20-30%. The 2024 regulations specify that the anti-corrosion coating thickness of prefabricated components in exposed environments must not be less than 30 millimeters to extend durability.
Fire protection regulations impose differentiated requirements on different components: prefabricated concrete load-bearing walls must have a fire resistance rating of ≥3 hours, non-load-bearing walls ≥2 hours, and floor slabs ≥1.5 hours; steel structures must be equipped with fireproof coatings or fireproof boards to ensure that the temperature rise rate does not exceed the limit during fires; high-risk areas such as kitchens and bathrooms must be equipped with additional fire separation zones.
Specifications for prefabricated slabs in rural self-built houses emphasize full-process control: materials must comply with national standards, and auxiliary materials such as steel bars and cement must also meet standards; structural design must calculate loads based on the intended use, number of floors, and geological conditions, reasonably determining spans and slab spacing; construction must ensure that the foundation is level and solid, temporary supports must be installed during installation and firmly connected; acceptance must check quality, position, and connection conditions, and regular maintenance must be carried out later.
