What is a Prefabricated Panel Structure House
A prefabricated panel structure house is a house built primarily with prefabricated panels, which are cement components prefabricated in factories.
Production and Types of Prefabricated Panels
Prefabricated panels are produced in factories through standardized processes: wooden molds are first nailed together, steel bars are arranged, and cement is poured to ultimately form cement components. Depending on their internal structures, prefabricated panels are divided into two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, lowering material consumption while ensuring load-bearing capacity, making it suitable for construction scenarios sensitive to weight.
Construction Methods and Historical Background
After being prefabricated in factories, prefabricated panels are transported to construction sites for assembly, similar to the modular construction method of “building blocks”. This model was widely promoted in the 1970s and 1980s, primarily to quickly address housing shortages. Its core advantages lie in fast construction speed (no need for on-site pouring and curing) and low cost (reducing labor and material waste), and it once became the mainstream method for urban residential construction in China.
Structural Defects and Issues
- Poor Integrity: Early prefabricated panel floors were produced in advance in factories and directly hoisted and assembled on-site. The gaps between panels were only filled with mortar, failing to form a solid overall structure. This design makes the house prone to separation under lateral forces (such as earthquakes), resulting in weak seismic performance.
- Durability Concerns: Over long-term use, the mortar at panel joints is prone to cracking, allowing rainwater to seep in and corrode the internal steel bars. The rusting and expansion of steel bars can damage the floor structure from within, leading to water leakage, cracks, and even the risk of partial collapse.
- Functional Limitations: Due to the standardized dimensions of prefabricated panels, the flexibility in house layout is relatively low, making it difficult to meet the diverse spatial needs of modern architecture.
Policies and Renovation Status
Currently, the country mainly adopts old housing renovation policies for prefabricated panel structure houses, improving living quality through reinforcement, elevator installation, pipeline renovation, and other methods (such as the renovation case of Guanong Community in Shanghai). Only when a house reaches the dangerous building standard (such as severe structural damage or the risk of collapse) will demolition and reconstruction be initiated (such as the reconstruction of a building in Beijing using new technology completed in three months). The renovation direction focuses on safety upgrades and functional modernization, balancing historical building preservation with residents' living needs.
