Reinforcement of Prefabricated Panel Houses

The reinforcement of prefabricated panel houses can be achieved through various methods. It is necessary to select an appropriate plan based on the structural characteristics, damage conditions, and usage requirements of the house, and strictly control construction details and quality acceptance.

I. Foundation Reinforcement
For issues such as insufficient foundation bearing capacity or settlement, methods such as increasing the foundation size, deepening the foundation, or adding steel reinforcement mesh can be employed to enhance foundation stability. If the foundation soil is soft, reinforcement agents or foundation sealing materials can be injected to improve seismic performance. For example, adding reinforced concrete ring beams around the original foundation can effectively disperse the upper loads and reduce the risk of uneven settlement.

II. Structural Reinforcement

1. Steel Component Reinforcement: Steel beams, columns, or plates can be added to key parts of the house, such as walls, stairs, and roofs, to form a composite structural system. For example, adding steel structural collars at the joints of prefabricated panels can limit crack propagation and improve overall stiffness.
2. Concrete Enhancement: Injecting reinforced concrete into the interior of walls can form a confined concrete structure, significantly enhancing seismic capacity. This method is suitable for reinforcing load-bearing walls in brick-and-concrete prefabricated panel houses.
3. Metal Frame Reinforcement: Lightweight metal frames can be installed on the exterior walls of the house and connected to the original structure with bolts to form a spatial load-bearing system, enhancing lateral resistance.

III. Seismic Isolation Technology
Installing seismic isolation devices (such as rubber isolation bearings and spring isolators) in the foundation or structure can isolate the transmission of seismic energy. For example, setting up an isolation layer between the foundation and the upper structure can reduce seismic forces by 60%-70%, significantly reducing structural damage.

IV. Floor Reinforcement

1. Section Increase Method: Pouring a reinforced concrete layer of more than 40mm on the upper and lower surfaces of the prefabricated floor and connecting it to the original slab with planted rebars to form a composite slab structure, enhancing load-bearing capacity.
2. Carbon Fiber Sheet Reinforcement: Carbon fiber sheets can be pasted along the main load-bearing direction of the floor, with U-shaped anchors installed at the top to improve flexural capacity by 30%-50%. This method is suitable for floors with cracks or insufficient reinforcement.
3. Steel Plate Bonding Reinforcement: Steel plates can be bonded to the tension zones of the floor using structural adhesives to transfer stress. However, attention should be paid to preventing peeling at the ends of the steel plates to avoid spalling of the concrete cover.

V. Other Reinforcement Methods

1. Grouting Reinforcement: Injecting cement-based grouting materials into wall cracks or foundation voids to fill gaps and enhance overall integrity.
2. Steel Mesh Reinforcement: Laying steel mesh on the surface of walls and spraying concrete to form a composite reinforcement layer, improving shear capacity.
3. Adding Supports: Adding diagonal or horizontal supports to walls or roofs to improve structural load transfer paths and enhance stability.

VI. Construction Precautions

1. Professional Assessment: Before reinforcement, a structural engineer should conduct an inspection and develop a targeted plan.
2. Material Selection: Prioritize materials with good compatibility with the original structure (such as modified epoxy resin adhesives and high-strength steel wire ropes).
3. Quality Control: Ensure that key indicators such as the welding quality of steel components and the fullness of carbon fiber sheet pasting meet standards during construction.
4. Post-Maintenance: After reinforcement, regularly inspect connection nodes, anti-corrosion coatings, etc., and promptly address rust or loosening issues.