Prefabricated Panel Structure House

Prefabricated panel structure houses are buildings constructed primarily using prefabricated panels, featuring specific historical backgrounds, structural characteristics, and existing issues, with current renovations following a differentiated strategy.

Historical Background and Structural Characteristics

Prefabricated panel structure houses originated in the early 20th century, with most residential buildings constructed in China before 1985 utilizing this structure. Prefabricated panels are factory-made cement components formed by nailing wooden molds, arranging steel bars, and pouring cement. They come in two types: solid and hollow. The hollow structure achieves lightweighting by reducing non-load-bearing concrete. This structure is mainly used for floor slabs and roof insulation layers, typically in buildings no more than six stories high. It was extensively constructed in the 1970s and 1980s due to its fast construction speed and low cost.

Existing Issues

Over time, the inherent deficiencies of prefabricated panel houses have gradually emerged. Firstly, weak earthquake resistance: According to construction engineering analysis, their primary flaw lies in improper handling of structural joints, resulting in poor seismic performance. Secondly, poor sound and heat insulation: They struggle to meet modern living standards for comfort. Thirdly, safety hazards: Most prefabricated panel houses have a designed service life of only 30-50 years, significantly shorter than the 80-100 years of modern reinforced concrete buildings. The 2024 national building safety inspection revealed that over 35% of prefabricated panel houses exhibit varying degrees of safety hazards, including wall cracks, loose floor slabs, and steel bar corrosion.

Renovation Strategies

With advancements in construction technology, cast-in-place concrete and prefabricated buildings are gradually replacing traditional prefabricated panel houses. Since 2022, China has implemented renovation policies focusing on repairing and upgrading prefabricated panel houses, with demolition reserved only for buildings deemed dangerous. The renovation of prefabricated panel houses under urban renewal is not a simple matter of demolition but involves precise interventions based on different conditions. The "Implementation Guide for Urban Renewal Actions" released by the housing and construction department at the end of 2024 explicitly states the principle of "resolutely preventing large-scale demolition and construction," advocating instead for a differentiated strategy combining "preservation and renovation" with "demolition and reconstruction." For prefabricated panel houses with good structural safety but outdated functional facilities, measures such as reinforcement and functional upgrades will primarily extend their service life. For those with severe structural safety hazards that cannot be resolved through reinforcement and repair, demolition and reconstruction will be implemented.