How to Reinforce Prefabricated Panel Houses

The reinforcement of prefabricated panel houses should be carried out by selecting targeted methods based on the structural condition of the house. Common reinforcement methods include the following:

1. Grouting Reinforcement Method
For cracks in walls or foundations, cement-based or chemical grouting materials are injected under high pressure to fill the gaps and enhance the overall structural integrity. This method can improve seismic performance, prevent crack propagation, and is suitable for walls or foundations with crack widths exceeding 0.3 millimeters. During construction, the grouting pressure should be controlled to avoid secondary damage to the prefabricated panels.

2. Steel Mesh Reinforcement Method
A steel mesh is laid on the surface of walls or floors and fixed with cement mortar or a special adhesive to form a composite reinforcement layer. This method can significantly improve the shear and flexural resistance of the structure, especially in cases where the floor load-bearing capacity is insufficient or walls are cracked. The specifications of the steel mesh should be determined based on load calculations, with mesh spacing typically ranging from 100 to 200 millimeters.

3. Steel Plate Bonding Reinforcement Method
For walls or floors with severe cracks or obvious deformation, steel plates are bonded using structural adhesive for reinforcement. The thickness of the steel plates is generally 4-8 millimeters, and they need to be reliably connected to the original structure using anchor bolts. This method can quickly restore the structural load-bearing capacity, but strict control over the quality of the adhesive and the humidity of the construction environment is required.

4. Foundation Reinforcement
If the foundation bearing capacity is insufficient, reinforcement can be achieved by expanding the foundation base area, adding ground beams, or driving piles. For soft soil foundations, cement slurry or chemical reinforcement agents can be injected to improve the density. Foundation reinforcement should be designed based on geological survey data to avoid new cracks caused by uneven settlement.

5. Profile Steel Reinforcement Method
L-shaped or H-shaped steel is installed along the four corners beneath the prefabricated panels to form an octagonal support system. This method can effectively disperse the floor load and improve overall stiffness, especially suitable for prefabricated panel floors with large spans. High-strength mortar or structural adhesive should be filled between the profile steel and the prefabricated panels to ensure reliable force transmission.

6. Carbon Fiber Bonding Method
High-strength carbon fiber cloth is bonded along the force direction of the prefabricated panels and impregnated with epoxy resin to form a composite material layer. This method is lightweight, easy to construct, and can increase the flexural load-bearing capacity of the floor by 20%-50%, making it suitable for reinforcement projects for commercial or residential renovations.

Key Construction Considerations:

• Before reinforcement, a structural safety assessment should be conducted, focusing on detecting the crack width of the prefabricated panels (treatment required if exceeding 0.3 millimeters) and the rust rate of connecting bolts (replacement required if exceeding 30%).
• During construction, a temporary support system should be erected, with steel pipe supports placed every 1.2 meters along the length of the prefabricated panels, and key nodes should be supported using H-shaped steel beams.
• After reinforcement, load tests and deformation monitoring should be carried out to ensure that all indicators meet the requirements of the 'Building Seismic Appraisal Standard'.