Reinforcement Methods for Prefabricated Floor Slabs in Houses

The reinforcement methods for prefabricated floor slabs in houses mainly include the following options, which can be selected based on specific needs and structural conditions:

1. Grouting Reinforcement Method By injecting high-strength grouting materials (such as cement-based or chemical grouting) into walls or foundations, internal voids or cracks in the structure are filled, enhancing overall strength and stability. This method can improve the seismic performance of the structure and reduce the risk of deformation, making it particularly suitable for repairing foundation settlement or wall cracking.

2. Steel Mesh Reinforcement Method A steel mesh is laid on the surface of walls or floor slabs and fixed with shotcrete or plaster layers to form a composite structure. The steel mesh effectively disperses loads and improves the structure's crack resistance, making it suitable for scenarios where the floor slab has insufficient load-bearing capacity or surface cracking.

3. Steel Plate Bonding Reinforcement Method Structural adhesive is used to bond steel plates to the tensioned areas of floor slabs or walls, enhancing the structural load-bearing capacity through the high-strength properties of the steel plates. This method is suitable for crack repair or load-bearing capacity enhancement needs, requiring secure bonding between the steel plate and the base material to avoid peeling failure.

4. Carbon Fiber Sheet Bonding For situations with minimal load increase, carbon fiber sheets can be directly bonded to the bottom of the floor slab, utilizing their high strength and lightweight properties to enhance flexural capacity. If the floor slab has openings located in the mid-span, equal-strength carbon fiber sheets should be bonded on both sides of the opening to compensate for section loss. This method offers convenient construction and minimal damage to the original structure.

5. Adding Steel Beams or Profile Steel Reinforcement

• Adding Steel Beams: Steel beams are added beneath the floor slab to reduce the load on the original slab by altering the load transfer path, suitable for scenarios with large spans or significant load increases.
• Profile Steel Reinforcement Method: Profile steel (such as angle steel or channel steel) is installed at the four corners of the prefabricated slab, forming an octagonal support system that significantly improves the floor slab's load-bearing capacity, particularly suitable for renovating old buildings.

6. Plywood Reinforcement Method As a mature technique, plywood (such as wooden or steel plates) is added between prefabricated slabs and fixed to form a composite structure, enhancing overall stiffness. This method is suitable for scenarios with weak connections between slabs or the need to improve overall integrity.

7. Foundation Reinforcement and Support Enhancement

• Foundation Reinforcement: By increasing the foundation size, deepening the foundation, or adding steel mesh, the foundation's load-bearing capacity is improved. Adding reinforcement agents or sealing materials can enhance seismic performance.
• Adding Support Reinforcement Method: Support members (such as diagonal braces or columns) are added to walls or roofs to disperse loads and reduce deformation, suitable for repairing structures with insufficient stability.

Selection Recommendations: Before reinforcement, structural inspection is necessary to identify the cause of damage (such as insufficient load-bearing capacity, cracks, or deformation) and its extent, and to develop a plan based on the building's usage needs. For example, minor cracks can be repaired using grouting or carbon fiber sheet bonding; when the load-bearing capacity is severely insufficient, priority should be given to adding steel beams or profile steel reinforcement. Construction should be carried out by a professional team to ensure material quality and workmanship standards.