Renovation Plan for Brick-Concrete Prefabricated Panel Houses

The renovation of brick-concrete prefabricated panel houses should focus on structural safety, combined with functional optimization and improvement of living comfort, and implement a scientific renovation plan in stages, as detailed below:

I. Preliminary Survey and Structural Assessment

1. Original Structure Survey and Calculation: Retrieve as-built drawings to clarify the location of load-bearing walls and their designed load-bearing capacity. For areas where drawings are missing or unclear, use a rebar scanner to detect rebar distribution and the tapping method to assess brick strength. Focus on inspecting issues such as misalignment of prefabricated panel joints, weathered and exposed rebar in cantilever beams, and excessively deep grooves in load-bearing walls. Have a structural engineer verify whether the additional loads from the renovation (such as new floors or large furniture) exceed the original design scope.
2. House Classification Assessment: If the foundation settlement exceeds 5 centimeters, the cracks in load-bearing walls are wider than 1 millimeter, or the seismic resistance is less than 70% of the current standard, the house is classified as a Grade D dangerous building and requires priority reinforcement or inclusion in demolition plans.
3. Clarify Renovation Red Lines: It is strictly prohibited to remove or damage load-bearing walls. If the house has structural aging (such as a decrease in the load-bearing capacity of 67% of prefabricated panel houses) or fire hazards (such as 41% of houses lacking fire exits), prioritize addressing these hazards or terminate the renovation.

II. Structural Reinforcement Plan

1. Foundation Reinforcement: Select methods based on foundation issues—when the load-bearing capacity is insufficient, use concrete jackets to expand the foundation base area; for uneven settlement or frost heave damage, use the foundation strengthening grouting method to fill cracks; for muddy soil or artificial fill foundations, use the anchor static pile method or root pile method to increase load-bearing capacity.
2. Wall Reinforcement: For minor insufficient load-bearing capacity, use the mortar surface layer method to coat the walls; when seismic resistance needs to be improved, use the steel mesh mortar surface layer method; for severely insufficient load-bearing capacity, pour reinforced concrete panel walls on both sides of the wall to form a composite wall.
3. Prefabricated Panel Reinforcement: In the tension zone, adhere steel plates with adhesive to improve flexural capacity (steel plate bonding reinforcement), or adhere carbon fiber sheets to repair minor misalignments or cracks (carbon fiber sheet reinforcement).

III. Functional Optimization Renovation

1. Space Adjustment: Under the premise of structural safety, remove or modify non-load-bearing walls (such as converting a two-bedroom house to a three-bedroom one). For cantilevered balconies, check the strength of the concrete cantilever beams and add support columns if necessary.
2. Hidden Project Upgrades: Reroute water and electricity pipelines, prioritizing the use of flame-retardant materials. Add splash-proof sockets in the kitchen and bathroom; apply waterproof coating in kitchen and bathroom areas up to 1.8 meters high and conduct a 48-hour water closure test to ensure no leakage.
3. Basic Project Improvements: Use thermal insulation and waterproof materials on walls and lay tiles or wooden floors on the ground (confirm the load-bearing capacity of the floor slab). Replace the roof with color steel tiles and use broken bridge aluminum soundproof windows to improve thermal insulation.

IV. Construction and Long-Term Safety

1. Professional Team: Demolition and modification work must be carried out by a qualified renovation company to avoid damaging load-bearing structures.
2. Phased Acceptance: Conduct acceptance inspections after the completion of each reinforcement project (such as foundations and walls) to ensure compliance with design requirements.
3. Long-Term Monitoring: The renovated house should be guaranteed for safe use for at least 50 years, with regular inspections of key parts such as prefabricated panel joints and cantilever beams.