Collapse of Prefabricated Concrete Houses
The main reasons for the collapse of prefabricated concrete houses include serious safety hazards, gaps in panel joints, exceeding load-bearing capacity, and house aging, among other factors.
Serious safety hazards: The structural characteristics of prefabricated concrete panel houses make them extremely sensitive to external forces such as earthquakes. Even a minor earthquake can cause the house to collapse. Additionally, the quality of prefabricated concrete panels on the market varies greatly, with a majority being of inferior quality. These low-quality products have a very short lifespan and may trigger house collapse accidents without people even realizing it. Inferior prefabricated panels not only lack sufficient strength but may also have internal defects such as air bubbles and cracks, which reduce their load-bearing capacity.
Gaps in panel joints: Prefabricated panels are assembled from individual pieces, and gaps inevitably exist at the edges of the panels, which are the root cause of all safety hazards. Compared to monolithic cast-in-place panels, prefabricated panels have significant disadvantages in terms of sound insulation and waterproofing. For example, their sound insulation ability is extremely poor. Due to their insufficient thickness and the presence of long circular holes in the middle, sound penetrates easily, and the structure itself is prone to transmitting sound. Water leakage is an unavoidable common problem in prefabricated panel houses. Rainwater can easily seep through the gaps into the interior, corroding the steel bars and thereby affecting the structural safety of the house. The existence of gaps not only reduces the integrity of the house but also provides channels for the intrusion of moisture and harmful substances.
Exceeding load-bearing capacity: For instance, in the accident on April 11, 2024, in Fengshou Community, Guanba Town, Zhongxian County, where a prefabricated panel of a house broke, resulting in 2 deaths and 3 injuries, preliminary investigations by experts at the scene determined that the cause of the accident was that the temporary load stacked on the second-floor slab was too large, exceeding the load-bearing capacity of the prefabricated panel, leading to brittle fracture and falling of the slab. The load-bearing capacity of prefabricated panels is limited, and loads exceeding their designed load-bearing capacity will cause structural damage.
House aging and other factors: During long-term use, houses can be damaged due to factors such as natural aging, house renovations, overloading, and construction at adjacent building sites, and severe damage may lead to collapse. Natural aging leads to a decline in material properties, house renovations may damage the original structure, overloading accelerates structural fatigue, and adjacent construction may generate vibrations and additional loads.
