Renovation Design of Prefabricated Panel Houses

The renovation design of prefabricated panel houses should focus on structural safety, functional upgrades, waterproofing, and construction specifications. The specific design points are as follows:

I. Preliminary Preparation and Structural Safety Assessment
Before renovation, a professional agency should be commissioned to conduct a comprehensive inspection of the house, focusing on identifying issues such as cracks in the prefabricated panels, steel bar corrosion, and foundation settlement. If the foundation settlement exceeds 5 centimeters or the width of cracks in load-bearing walls is greater than 1 millimeter, reinforcement should be prioritized. Based on the inspection results, a renovation plan should be formulated to avoid arbitrary removal of walls or increasing loads. For newly added partition walls, lightweight materials such as aerated concrete blocks and light steel keel gypsum boards should be selected, with a thickness controlled within 120mm.

II. Structural Reinforcement and Load Control
For prefabricated panels with potential safety hazards, carbon fiber cloth reinforcement, steel plate bonding reinforcement, or the addition of support beams can be used to enhance load-bearing capacity. For minor wall cracks, grouting repair can be applied, while severe cracks require steel plate reinforcement. When wiring, avoid damaging the steel bar protective layer on the surface of the prefabricated panels, and try to follow panel seams or use open wiring methods to minimize structural damage.

III. Functional Upgrade Design
To address the poor sound insulation of old prefabricated panel houses, soundproof panels and double-glazed windows can be installed, improving sound insulation by approximately 70%. Space optimization can be achieved by removing non-load-bearing walls (subject to structural assessment approval), adopting an open layout, or using custom furniture. If conditions permit, an elevator can be installed to solve the issue of no elevator access.

IV. Waterproofing and Closed Water Test
After cleaning the surface dust of the prefabricated panels, apply a permeable crystalline waterproof leveling mortar to fill panel seams and minor cracks. After drying, apply 2-3 coats of polyurethane waterproof coating with a thickness of not less than 1.5mm. After the waterproof layer is applied, conduct a 72-hour closed water test to observe for any leakage on the ceiling below or adjacent walls. Any issues found must be repaired and retested.

V. Material Selection and Detail Handling
For ground backfilling or ceiling filling, lightweight materials such as perlite and expanded clay should be prioritized. The junctions between walls and floors (such as wall bases and pipe bases) should be reinforced with waterproof coating to form rounded corners and avoid stress concentration cracking.

VI. Construction Specifications and Acceptance Standards
The construction sequence should follow 'structural reinforcement → waterproofing → pipeline installation → filling and backfilling → decoration', avoiding cross-operations that could damage completed work. Hidden projects such as water and electricity lines and waterproof layers should retain image records and be jointly inspected and signed off by the owner and supervisor before being covered. After renovation, regularly inspect the prefabricated panels for new cracks or deformation within 1-2 years.