Design of Prefabricated Panel Houses

The design of prefabricated panel houses requires a comprehensive consideration of the types of prefabricated panels, existing issues, and reinforcement measures, while also making reasonable placement designs tailored to the characteristics of rural self-built houses.

Types and Production of Prefabricated Panels

Prefabricated panels are cement components produced in factories. During production, wooden models are nailed together, and steel bars are arranged before pouring cement to form the panels. There are two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, making it suitable for scenarios with lower load-bearing requirements, such as floor slabs or roof insulation layers. Solid panels, on the other hand, have a denser structure and stronger load-bearing capacity, often used in areas requiring higher load-bearing capacity.

Existing Issues and Reinforcement Design

Prefabricated panel houses commonly face issues such as weak earthquake resistance, poor sound and thermal insulation, and a service life of approximately 30-50 years. Reinforcement designs need to adopt differentiated measures based on different structural conditions:

• When the foundation structure is healthy: Carbon fiber cloth can be applied to the floor slab for reinforcement. Carbon fiber cloth is lightweight and sturdy, and when pasted to the bottom of the prefabricated panel with a special adhesive, it enhances the tensile strength of the floor slab, prevents crack expansion, and has minimal impact on indoor space.
• When the load-bearing capacity of the floor slab significantly declines: The section enlargement method should be adopted, which involves laying a new steel bar mesh on the existing floor slab and pouring at least 4 centimeters of new concrete to increase integrity and enhance earthquake resistance and load-bearing capacity.
• For old house types with large living room spans and a lack of intermediate supports: Steel beam supports can be added to distribute the floor slab pressure to the surrounding load-bearing walls, enhancing structural stability.

Placement Design of Prefabricated Panels in Rural Self-Built Houses

The placement of prefabricated panels in rural self-built houses should be determined based on the house span, deciding whether to place them horizontally or vertically. If the house width is greater than its length, and the north-south span of small rooms exceeds the east-west span, the safest method is to build the floor slab horizontally in the direction with the smaller span. The reasons are as follows:

• Horizontally placed floor slabs can withstand more pressure and remain more stable during foundation settlement.
• Horizontal placement reduces the risk of structural damage caused by uneven foundation settlement, extending the service life of the house.

In addition, the design should consider local climate, geological conditions, and usage requirements to reasonably select the types of prefabricated panels and reinforcement plans, ensuring the safety and durability of the house.