How to Reinforce Prefabricated Panel Houses

Multiple methods can be employed to reinforce prefabricated panel houses, and it is essential to select an appropriate plan based on the actual situation of the house while paying attention to construction details and subsequent maintenance.

I. Common Reinforcement Methods

1. Grouting Reinforcement Method
   By injecting cement-based grouting materials into walls or foundations, cracks and voids are filled, enhancing the overall structural strength and stability. This method is particularly suitable for houses with foundation settlement or wall cracking.

2. Steel Mesh Reinforcement Method
   Laying a steel mesh on the surface of walls or floors and covering it with cement mortar forms a composite structural layer, improving crack resistance. This method is applicable to floors or walls with insufficient load-bearing capacity.

3. Steel Plate Bonding Reinforcement Method
   Using structural adhesive to bond steel plates to cracks in walls or floors, the high strength of the steel plates compensates for structural defects in the original structure. This method is suitable for situations with severe local load-bearing deficiencies.

4. Foundation Reinforcement
   By expanding the foundation base area, deepening the foundation depth, or adding steel mesh, the load-bearing capacity of the foundation is enhanced. Adding reinforcing agents can improve seismic performance, making this method suitable for houses with soft foundations or uneven settlement.

5. Additional Support Reinforcement Method
   Adding steel supports or concrete columns to walls or roofs disperses loads and reduces deformation risks, making it suitable for areas with large spans or weak structures.

6. Floor Opening Reinforcement
   If the opening is located in the middle of the floor span, carbon fiber sheets should be bonded on both sides of the hole to compensate for the loss of load-bearing capacity caused by the opening through their high tensile strength.

7. Wall-to-Beam Conversion Method
   Demolishing prefabricated panel walls at risk of fracture and replacing them with reinforced concrete beams eliminates structural hazards entirely, making it suitable for thorough renovations of old prefabricated panel houses.

II. Key Construction Steps

1. Structural Safety Assessment
   Focus on detecting the width of cracks in prefabricated panels (those exceeding 0.3 mm require treatment) and the corrosion rate of connecting bolts with ring beams (those exceeding 30% require replacement) to determine the scope of reinforcement.

2. Exterior Wall Treatment
   Re-plaster and grout with planted rebar to enhance the tensile performance of walls. Before construction, erect a temporary support system, placing steel pipe supports every 1.2 meters along the length of the prefabricated panels, and use H-section steel beams for critical nodes.

3. Panel Joint Repair
   Remove the original filling material, implant No. 6 threaded rebar, and pour C30 fine aggregate concrete to restore the connection strength of panel joints.

4. Adding Structural Columns
   Add 240×240 mm structural columns at the corners of the house, using No. 6 and No. 8 rebar for reinforcement and connecting them to the floor to enhance overall seismic performance.

III. Precautions

1. Professional Assessment and Planning
   A structural engineer should formulate the reinforcement plan, and the construction team should possess relevant qualifications to avoid secondary damage caused by blind construction.

2. Construction Quality Control
   Ensure that carbon fiber sheets are fully bonded to the floor surface when applied, and that steel structural collars are tightly connected and fixed to prevent hollowing or loosening.

3. Environmental and Personnel Protection
   Implement noise reduction and dust control measures during construction to minimize the impact on surrounding residents. After reinforcement, conduct ultrasonic or radiographic testing to ensure quality compliance.

4. Long-Term Maintenance Management
   Regularly inspect the reinforced areas, focusing on the development of cracks, steel plate corrosion, or carbon fiber sheet detachment, and promptly address potential hazards.