Old-style Prefabricated Panel Houses

Old-style prefabricated panels are a crucial component in constructing houses, primarily using prefabricated panels as the main structural elements. They possess specific structures, historical backgrounds, construction characteristics, and existing issues, with relevant policies now regulating their handling.

Structure and Types

Prefabricated panels are cement components manufactured in factories. During production, wooden molds are first nailed together, followed by the placement of steel reinforcement and the pouring of cement to form the panels. These panels come in two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, ensuring a certain level of strength while lowering the self-weight of the components, facilitating transportation and installation.

Historical Background and Applications

This construction method originated in the early 20th century and was primarily used for floor slabs and roof insulation layers. In China, residential buildings constructed before 1985 often adopted this structure. Its construction method, akin to 'building with blocks,' involved assembling pre-fabricated cement panels piece by piece, offering fast construction speeds and low costs, meeting the substantial housing demand at the time.

Existing Issues

Existing prefabricated panel houses generally face numerous problems. Weak Earthquake Resistance: Due to their structural characteristics, they struggle to effectively resist seismic forces during natural disasters like earthquakes, making them prone to severe damage such as collapse. Poor Sound and Heat Insulation: The gaps between prefabricated panels and the material properties result in inadequate sound and heat insulation, affecting living comfort. Short Design Service Life: Typically lasting only 30-50 years, some 'over-aged' houses exhibit extensive wall peeling, numerous wall cracks, and in severe cases, become dilapidated structures at risk of collapse at any moment.

Relevant Policies

Since 2022, China has implemented renovation policies focusing on repairing and upgrading prefabricated panel houses, with demolition reserved only for buildings meeting hazardous standards. The aim is to improve residents' living conditions and ensure safety. In 2023, relevant departments explicitly stipulated that within urban construction land areas, the construction of new, renovated, or expanded prefabricated panel houses and other buildings not meeting safety standards is prohibited, enhancing the overall safety and quality of urban architecture.