Prefabricated House Floor Slab

The prefabricated house floor slab usually refers to the prefabricated panel, which is a cement component prefabricated in a factory, with specific structures, uses, and limitations, and is gradually being replaced by new building technologies.

Structure and Types

Prefabricated panels are made by nailing wooden models, arranging steel bars, and pouring cement. They are divided into two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, reducing material usage while ensuring load-bearing capacity, suitable for scenarios sensitive to weight. Solid prefabricated panels, due to their dense structure, have stronger load-bearing capacity but are heavier, resulting in higher transportation and installation costs.

Building Uses

Prefabricated panels are widely used in the construction field. They were commonly used for residential floor slabs and roof insulation layers in the early days. For example, residential buildings constructed in China before 1985 generally adopted prefabricated panel house structures, relying on prefabricated panels for both floor slabs and roof insulation layers. In addition, they are often used as covers for ditches beside highways and floors for temporary buildings. Due to standardized production and convenient installation, they can quickly meet basic functional requirements.

Limitations

Existing prefabricated panel houses have significant defects: Weak earthquake resistance is a major issue. Their node connection methods (such as welding or bolt fixation) are prone to loosening during earthquakes, leading to structural damage. Poor sound insulation and thermal insulation performance: Although the hollow structure reduces weight, the insufficient filling of thermal insulation materials, and the high thermal conductivity of concrete in solid panels result in large indoor temperature differences. Limited service life: Usually 30-50 years, long-term environmental erosion (such as freeze-thaw cycles and chemical corrosion) increases the risk of steel bar corrosion and concrete cracking, affecting safety.

Technological Replacement Trends

With the advancement of building technologies, cast-in-place concrete and prefabricated buildings are gradually replacing traditional prefabricated panel houses. Prefabricated buildings use modular factory-prefabricated components. For example, CMC (Composite Modular Construction) buildings significantly improve earthquake resistance (able to withstand magnitude-8 earthquakes) through integrated steel-concrete pouring, and the construction period is shortened by 30% compared to traditional methods. In addition, the application of new materials (such as high-strength fiber concrete) and connection technologies (such as wet connections) further compensates for the deficiencies of prefabricated panels in durability and integrity, driving the construction industry towards a safer and more efficient direction.