How to Reinforce Walls of Prefabricated Houses

The following methods can be used to reinforce the walls of prefabricated houses, and the specific operation should select an appropriate plan based on the wall structure and the extent of damage:

1. Grouting Reinforcement Method Inject cement-based or chemical grouting materials into cracks or pores in the wall using pressure equipment to fill the cavities and enhance the overall structural integrity. This method is suitable for walls with minor cracks or localized looseness. It can effectively improve the wall's compressive and shear strength while enhancing its seismic resistance. Before operation, the crack surface should be cleaned to ensure full adhesion between the grouting material and the original structure. After grouting, the material should be cured until fully solidified.

2. Steel Mesh Reinforcement Method Lay a steel mesh (e.g., Φ4-Φ6 steel bars with a spacing of 150-300mm) on the wall surface, fix it with anchors or planted rebars, and then apply high-strength mortar or spray concrete to form a composite structure. This method can significantly improve the wall's crack resistance and is particularly suitable for addressing cracking issues in brick or concrete prefabricated walls caused by temperature changes or foundation settlement. The steel mesh should be tightly bonded to the wall base, and the mortar thickness should generally be controlled between 20-30mm.

3. Steel Plate Bonding Reinforcement Method For walls with insufficient load-bearing capacity or severe cracking, use structural adhesive to bond steel plates (4-8mm thick) to both sides of the wall, forming an integral structure through bolts or welding. The steel plates can effectively restrain wall deformation and improve bending and shear resistance. During construction, the wall surface should be roughened to ensure a penetration depth of the structural adhesive of at least 3mm, and the edges of the steel plates should be sealed to prevent rusting.

4. Structural Reinforcement Add steel beams, steel columns, or concrete structural columns at key points of the wall to form a frame support system. For example, install H-shaped steel beams at the connections of prefabricated wall panels or set up reinforced concrete structural columns at regular intervals, connecting them to the original wall through chemical planting of rebars. This method can significantly enhance the overall stiffness of the house and is suitable for seismic reinforcement of multi-story prefabricated houses.

5. Steel Bar Reinforcement Implant horizontal or vertical steel bars inside the wall to form hidden columns or beams. For example, drill holes at the joints of prefabricated wall panels and implant Φ12-Φ16 steel bars with a spacing of 300-500mm, filling them with high-strength grouting material. This method can enhance the connection strength of the wall and prevent cracking at the joints, especially suitable for node reinforcement in assembled prefabricated houses.

Implementation Points: Before reinforcement, conduct a comprehensive inspection of the wall to determine the cause and extent of damage. During construction, follow the principle of "reinforcement before decoration" to avoid damaging the original structure. Reinforcement materials should comply with national standards, and after construction, load-bearing capacity calculations and deformation monitoring should be carried out.