How to Use Prefabricated House Slabs

The use of prefabricated house slabs requires determining the placement direction based on the span of the house. Typically, they are laid horizontally in the direction with the smaller span, and must meet requirements for structural safety, quality control, and compliance.

1. Placement Direction Selection

The placement direction of prefabricated house slabs directly affects their load-bearing capacity and structural stability. If the north-south span of a small room inside the house is greater than the east-west span, the direction with the smaller span (e.g., east-west) should be chosen for horizontal slab placement. This layout enhances the overall load-bearing performance of the slab while reducing structural risks caused by uneven foundation settlement. If the room span is extremely small (e.g., 2 meters long and 3 meters wide), the choice of direction has a minimal impact on the structure, but the principle of horizontal placement should still be prioritized.

2. Structural Safety Requirements

Prefabricated slabs are prefabricated concrete components with relatively weaker seismic performance compared to cast-in-place structures. Therefore, before use, it is essential to ensure that the overall structure of the house complies with seismic design codes and avoid using them in earthquake-prone areas or regions with unstable geological conditions (e.g., soft soil layers or landslide zones). If their use is unavoidable, reinforcement measures such as adding structural columns and ring beams should be implemented to enhance the overall structural integrity, and local seismic fortification standards must be strictly followed.

3. Quality Control Points

• Production Process: Choose a qualified prefabricated component manufacturer to ensure that the quality of raw materials (e.g., cement and steel bars) for the prefabricated slabs meets national standards (e.g., GB/T 1499.2-2018 'Steel for the Reinforcement of Concrete - Part 2: Hot Rolled Ribbed Bars'), and that the production process undergoes rigorous quality inspection.
• Installation Process: Before installation, check the surface flatness of the prefabricated slabs, the positions of embedded parts, and the concrete strength. During installation, use methods such as bedding mortar or mechanical connections (e.g., bolt fixation) to ensure tight jointing between slab seams and firm connections, avoiding 'hanging slabs' or 'misaligned slabs'.

4. Compliance Review

The use of prefabricated slabs must comply with local building regulations. It is recommended to consult the local housing and urban-rural development department before use to confirm whether their use is permitted in specific building types (e.g., multi-story residential buildings or public buildings). If the project involves renovation or addition work, it is also necessary to have a professional lawyer review whether it complies with planning permits and property rights regulations to avoid legal disputes arising from non-compliant use.

Additional Note: The production process of prefabricated slabs involves creating a hollow mold with wooden planks at a prefabrication yard, laying steel bars inside, and pouring concrete. After drying, the wooden planks are knocked off to form hollow or solid components. Their advantages include high construction efficiency and lower costs, but strict control over production and installation quality is necessary to compensate for their structural performance shortcomings.