Renovation of Rural Brick Prefabricated Panel Houses

The renovation of rural brick prefabricated panel houses requires a comprehensive assessment of structural safety, followed by the selection of either reinforcement renovation or reconstruction plans, as detailed below:

I. Renovation Process and Key Technologies for Reinforcement

1. Structural Safety Assessment
   Before renovation, a comprehensive inspection of the prefabricated panels is necessary, including measuring crack widths (special treatment required for widths exceeding 0.3 mm), assessing the connection status between the panels and the ring beams (replacement needed if bolt corrosion exceeds 30%), and evaluating the overall seismic performance of the house. For example, houses with prefabricated panels aged 30 years should focus on inspecting panel joints, connection nodes, and the absence of structural columns.

2. Wall and Panel Joint Treatment
   After removing the original exterior wall tiles, the exterior walls should be repainted and reinforced with steel bars and grout. For panel joints, the original filling material should be removed, No. 6 threaded steel bars should be inserted, and C30 fine aggregate concrete should be poured to enhance overall integrity.

3. Support System and Structural Column Reinforcement
   When setting up a temporary support system, steel pipe supports should be placed every 1.2 meters along the length of the prefabricated panels, with H-section steel beams used for critical node replacement. At the four corners of the house, 240*240 mm structural columns should be added, reinforced with No. 6 and No. 8 steel bars and connected to the floor slabs to improve seismic resistance.

4. Construction Sequence and Monitoring
   Adopt the principle of 'middle first, then sides' for segmental demolition, with a daily demolition volume not exceeding 30% of the total floor area. During demolition, continuously monitor the stress changes in the support system and prohibit heavy hammer impact demolition to avoid structural damage.

II. Controversies and Choices Between Renovation and Reconstruction

1. Advantages of Reconstruction
   Cast-in-place slab structures are better suited to diverse architectural environments compared to prefabricated panels, with increased steel bar usage and significantly improved load-bearing and seismic performance. Prefabricated panel houses commonly suffer from water leakage and poor seismic resistance, issues that are difficult to completely resolve through renovation due to material and structural disadvantages.

2. Cost Considerations
   The maintenance costs of prefabricated panel houses tend to rise with age, potentially exceeding the long-term costs of reconstruction. Reconstruction allows for the use of eco-friendly materials (such as recycled concrete, thermal insulation panels) and new technologies (such as prefabricated structures), with national policies (such as subsidies, tax reductions) helping to reduce financial burdens.

Decision-Making Advice: If the house has severe structural damage (such as dense cracks, failed connection nodes) or requires an upgrade in seismic rating, reconstruction is a more thorough option. If the damage is locally controllable, reinforcement renovation can extend the service life, but regular maintenance will be necessary.