How to Reinforce Prefabricated Floor Slab Houses

The reinforcement of prefabricated floor slab houses should be based on the structural characteristics, damage degree, and usage requirements of the house. Scientific and reasonable reinforcement methods should be selected. The following are common reinforcement methods:

1. Foundation Reinforcement

If the foundation of the house has insufficient bearing capacity or there is a risk of settlement, foundation reinforcement should be prioritized. Increasing the foundation size can disperse the upper loads. Deepening the foundation can avoid soft soil layers. Installing steel reinforcement meshes can enhance the overall integrity of the foundation. In addition, reinforcing agents can be injected or foundation sealing materials can be used to fill cracks, improving the foundation's seismic resistance and preventing foundation failure during earthquakes.

2. Structural Reinforcement

For key parts such as walls, stairs, and roofs, installing steel beams, steel columns, and steel plates can form a steel structural support system, enhancing the overall strength and stiffness of the house. For walls with insufficient seismic resistance, the method of injecting reinforced concrete into the wall interior can be adopted to form a composite structure and improve lateral resistance performance.

3. Floor Slab Reinforcement

1. Increasing the floor slab cross-section: Add a reinforced concrete adhesive layer not less than 40 millimeters thick on the surface and bottom of the prefabricated floor slab. By increasing the cross-sectional area, the bearing capacity can be improved. This method is suitable for situations where the floor slab deforms due to increased loads.
2. Sticking carbon fiber sheets: Stick carbon fiber sheets along the stress direction of the floor slab in the tension zone and set anchor points at the top. Utilize the high-strength characteristics of carbon fiber to enhance the flexural capacity of the floor slab. This method is convenient for construction and causes little damage to the original structure.
3. Sticking steel plate reinforcement: Stick steel plates in the flexural area of the floor slab and bond them with concrete using structural adhesives. However, it should be noted that the steel plate and the concrete are prone to peeling due to inconsistent deformation, so strict quality control during construction is required.

4. Seismic Isolation and Damping Reinforcement

Installing devices such as spring seismic isolators and rubber seismic isolators in the foundation or structure of the house can effectively isolate seismic energy, reduce the impact of horizontal and vertical seismic forces on the house, and lower the vibration amplitude. This method is suitable for areas with high earthquake frequency or buildings with high seismic requirements.

5. Auxiliary Reinforcement Measures

1. Grouting reinforcement: Inject cement-based grouting materials into cracks in walls or foundations to fill voids and enhance overall integrity, preventing crack propagation.
2. Steel reinforcement mesh reinforcement: Lay steel reinforcement meshes on the surface of walls or floor slabs and form a composite layer by spraying concrete to improve crack resistance and bearing capacity.
3. Adding supports: Add diagonal braces, cross braces, and other components to walls or roofs to disperse loads and limit deformation. This method is suitable for areas with insufficient local bearing capacity.

Reinforcement construction should be carried out by a professional team, strictly following design specifications and construction techniques to ensure the quality of materials and the reliability of node connections. After reinforcement is completed, a comprehensive quality inspection should be carried out, including items such as material strength, component deformation, and connection nodes. The house can be put into use only after passing the acceptance inspection.