Reinforcement Methods for Prefabricated Slab Buildings

The reinforcement methods for prefabricated slab buildings mainly include the following:

1. Grouting Reinforcement Method By injecting cement-based or chemical grouting materials into walls or foundations, cracks and voids are filled, enhancing the overall structural strength and stability. This method can effectively improve foundation bearing capacity, reduce settlement risks, and enhance seismic performance, making it suitable for buildings with minor cracks or soft foundations.

2. Steel Mesh Reinforcement Method A steel mesh is laid on the surface of walls or floors, and concrete is sprayed to form a composite structural layer. This method significantly improves structural crack resistance and stiffness through the synergistic action of steel and concrete, making it particularly suitable for scenarios where walls are cracked or floor bearing capacity is insufficient.

3. Steel Plate Bonding Reinforcement Method Structural adhesive is used to bond steel plates to the tensioned areas of walls or floors, enhancing the load-bearing capacity of components through the high-strength properties of steel plates. This method has a short construction period and causes minimal damage to the original structure, but it is essential to ensure that the steel plates are firmly bonded to the substrate to prevent peeling after long-term use.

4. Foundation Reinforcement Techniques

• Size Expansion: By increasing the foundation base area or deepening the foundation, the upper load is dispersed, enhancing foundation bearing capacity.
• Material Strengthening: Adding steel mesh or high-strength concrete to the foundation enhances shear resistance; or using reinforcement agents to improve soil properties and enhance seismic performance.

5. Additional Support Reinforcement Method Steel supports, diagonal braces, and other components are added to walls or roofs to form a spatial load-bearing system, dispersing loads and limiting structural deformation. This method is suitable for large-span spaces or areas with insufficient local bearing capacity, effectively improving overall stability.

6. Structural Reinforcement Measures

• Steel Component Reinforcement: Steel beams and columns are added to key areas such as walls and stairs to form a frame support system.
• Concrete Injection: Reinforced concrete is injected into walls to enhance seismic capacity, suitable for brick-concrete structure buildings.

7. Seismic Isolation Reinforcement Technique By installing spring isolators, rubber isolation bearings, and other devices in the foundation or structure, seismic energy transmission is isolated, reducing structural seismic response. This method can reduce seismic forces by more than 70%, significantly enhancing building safety.

8. Carbon Fiber Sheet Reinforcement Method Carbon fiber sheets are pasted along the tensioned direction of floors and anchored to enhance floor load-bearing capacity through the high-strength properties of carbon fiber. This method is lightweight and easy to construct, suitable for reinforcing floors with cracks or insufficient load-bearing capacity.

9. Floor Section Augmentation Reinforcement Reinforced concrete layers of more than 40mm are added to the surface and bottom of prefabricated floors to form a composite floor structure. This method effectively enhances floor stiffness and load-bearing capacity, but attention must be paid to the interface treatment between new and old concrete to prevent delamination.