Renovation of Four-Story Prefabricated Panel Houses

The renovation of four-story prefabricated panel houses requires following a professional process that combines structural assessment, reinforcement measures, and functional upgrades to ensure safety and practicality.

1. Professional Assessment and Reinforcement Design as Prerequisites for Renovation
Before renovation, it is essential to commission a professional team to conduct a comprehensive structural assessment, focusing on key areas such as prefabricated panels, load-bearing walls, and foundations for any cracks, deformations, or signs of aging. For example, during the renovation of Building G at Zhenjiang First People's Hospital, the design unit developed a reinforcement plan through detailed testing and drew a reinforcement plan for the four-story prefabricated panels. The assessment results will directly determine the subsequent renovation direction: if the main structure is severely damaged, priority should be given to reinforcement; if only local issues exist, targeted repairs can be made.

2. Targeted Reinforcement Measures to Address Core Issues
Based on the assessment results, differentiated reinforcement measures should be taken for different structural defects:

• Wall Cracks: Cracks less than 0.3 millimeters wide can be repaired with epoxy resin injection; if the cracks penetrate the wall or are more than 1 millimeter wide, steel plates or carbon fiber cloth should be added to enhance load-bearing capacity.
• Roof Leakage: The original waterproof layer must be removed, and SBS modified bitumen membrane or polymer waterproof coating should be reapplied, ensuring that the roof drainage slope meets standards.
• Unstable Foundation: If the foundation settlement is uneven, static pressure piles or root piles should be used for reinforcement, transferring the load to deeper stable soil layers through the piles.

3. Functional Upgrades Balancing Structural Safety and Modern Needs
On the basis of reinforcement, the house's functionality can be optimized:

• Sound Insulation Improvement: Install soundproof panels (such as polyester fiber cotton panels) on interior walls and replace windows with double-glazed units to reduce external noise interference.
• Space Optimization: When removing non-load-bearing walls, confirm the wall type to avoid compromising structural safety; redivide functional areas using lightweight steel frame partitions.
• Elevator Installation: If an elevator needs to be added, assess the building's load-bearing capacity and select a lightweight elevator model, ensuring that the elevator shaft is securely connected to the original structure.

4. Localized Renovation Experience Ensures Scheme Adaptability
Renovation should consider the structural characteristics of old houses in the region to avoid a one-size-fits-all approach. For example, renovations in Yangquan should focus on issues such as steel corrosion at the joints of prefabricated panels and insufficient mortar strength in old brick-concrete walls, prioritizing locally proven reinforcement techniques (such as brick wall steel-cladding reinforcement) and selecting materials suitable for the local climate (such as cold-resistant waterproof membranes).