Reinforcement Methods for Prefabricated Slab Houses

The reinforcement methods for prefabricated slab houses mainly include the following options, and an appropriate solution can be selected based on specific needs:

I. Overall Structural Reinforcement

1. Grouting Reinforcement Method Inject cement-based or chemical grouting materials into cracks or voids in walls and foundations using pressure equipment to fill the gaps and enhance overall integrity. This method can improve the seismic performance of the structure, prevent deformation propagation, and is particularly suitable for repairing foundation settlement or wall cracking.

2. Steel Mesh Reinforcement Method Lay a steel mesh (e.g., Φ4-Φ6 steel bars with a spacing of 150-300mm) on the surface of walls or floors, fix it with anchor bolts, and then spray concrete or apply cement mortar for coverage. This method can significantly enhance the shear capacity of the structure and is suitable for brick-concrete structures with insufficient seismic resistance.

3. Steel Plate Bonding Reinforcement Method Use structural adhesive to bond steel plates (4-8mm thick) to the stressed parts of walls or floors, improving the load-bearing capacity through the coordinated work of the steel plates and the original structure. Attention should be paid to the anchoring treatment at the ends of the steel plates to avoid peeling damage, and this method is suitable for components with severely insufficient local load-bearing capacity.

4. Profile Steel Reinforcement Method Install L-shaped or channel steel (e.g., No. 10 channel steel) at the four corners below the prefabricated slabs, forming an octagonal support system through welding or bolt connections. This method can effectively disperse the load on the floor slabs, increasing the load-bearing capacity by 30%-50%, and is suitable for reinforcing large-span floor slabs.

II. Foundation and Support Strengthening

1. Foundation Reinforcement For shallow foundations, methods such as increasing the base area and adding ground beams can be adopted; for weak foundations, deep mixing piles or root piles can be used for reinforcement. At the same time, waterproof coatings can be applied or steel mesh sheets can be laid on the foundation surface to improve durability.

2. Additional Support Reinforcement Method Add concrete or steel support columns between walls or connect the roof and walls with diagonal braces. The support spacing needs to be determined through calculation, generally not exceeding 3 meters, and is suitable for houses with excessive spacing between transverse walls.

3. Temporary Support System For dangerous components, use steel pipe scaffolding (with a spacing of 1.2m) or H-shaped steel beams (with a cross-section of ≥200×200mm) for underpinning to ensure structural safety during construction. Reliable connection nodes need to be set up to avoid local instability.

III. Local Defect Repair

1. Slab Joint Treatment Remove the loose materials from the original slab joints, implant φ6 deformed steel bars (with a spacing of 300mm), and pour C30 fine aggregate concrete and vibrate it densely. After treatment, the shear strength of the slab joints can be increased by more than 50%, effectively reducing transverse cracks.

2. Rebar Planting and Grouting Treatment Drill holes (with a diameter of ≥12mm) at the corners of exterior walls or around door and window openings, implant φ8 steel bars, and then inject epoxy resin grouting material. This method can enhance the overall integrity of the walls and improve wind pressure resistance.

3. Carbon Fiber Bonding Method Bond high-strength carbon fiber sheets (with a thickness of 0.167mm per layer) along the stressed direction of the components, forming a composite reinforcement layer through epoxy resin impregnation. A single layer of carbon fiber can increase the flexural load-bearing capacity of the components by 10%-15%, and is suitable for reinforcing floor slabs or beams.

IV. Optimization of Structural Measures

Addition of Structural Columns Add 240×240mm structural columns at key positions such as the four corners of the house and stairwells, with main reinforcement consisting of 4φ12 + φ6@200 stirrups, and connect the tops to the ring beams. The spacing between structural columns should not be greater than 6 meters, which can significantly improve the overall stiffness of the house.

The selection of a reinforcement plan should be based on a comprehensive assessment of the house's damage degree, usage function, and economy. It is recommended that a professional structural engineer conduct on-site inspections and then formulate a targeted plan.