Prefabricated Panels in Old Houses
Prefabricated panels in old houses are key components constructed primarily from prefabricated panels, which harbor hidden dangers and have specific requirements for renovation and inspection.
Basic Information on Prefabricated Panel Houses
Prefabricated panels are cement components manufactured in factories, available in solid and hollow types. They emerged in the 1970s and 1980s and became a crucial solution for alleviating housing pressure due to their rapid construction and low cost.
Hidden Dangers of Prefabricated Panel Houses
- Poor Thermal Insulation and Soundproofing: These houses are cold in winter and hot in summer, with poor ventilation and a lack of soundproofing, resulting in a lack of privacy in neighborhood life.
- Limited Design Lifespan: Typically around 40 years, many have now exceeded their intended service life, showing signs such as peeling wall surfaces, wall cracks, and even becoming dangerous buildings.
- Appearance and Space Issues: Standardized designs result in monotonous house exteriors and cramped interior spaces. The floor plans lack humanization, with some kitchens and bathrooms lacking windows and small living room areas.
Renovation Requirements
Taking the reinforcement and renovation of a 30-year-old prefabricated panel house as an example, a comprehensive structural safety assessment must be conducted before renovation, focusing on inspecting the crack width of the prefabricated panels and their connection status with the ring beams. During construction preparation, a temporary support system should be erected, with steel pipe supports placed every 1.2 meters along the length of the prefabricated panels. Key nodes should use H-shaped steel beams for beam replacement. For the panel joints, the original filling material should be removed, steel bars implanted, and concrete poured. Construction columns should be added at the four corners of the house. The construction sequence should proceed from the middle to the sides, with the daily demolition amount not exceeding 30% of the total floor area. The stress changes in the support system should be monitored in real-time, and heavy hammer impact demolition is prohibited.
Policy Regulations
In 2023, relevant departments stipulated that the construction of buildings such as prefabricated panel houses that do not meet safety standards is prohibited within urban construction land areas for new construction, renovation, or expansion. Existing prefabricated panel houses should be gradually demolished based on actual conditions. Since 2022, an old housing renovation policy has been implemented, focusing on repair and renovation, with only buildings that meet the criteria for dangerous houses being demolished.
Hidden Danger Inspections
Inspections should focus on the "structural integrity," "condition of the components themselves," and "usage and renovation conditions," including checking for ground settlement around the house, wall cracks, the condition of the prefabricated floor panels, the condition of the load-bearing walls, and any unauthorized renovation activities.
