Safety Issues with Prefabricated Panel Houses

Prefabricated panel houses indeed have safety hazards, primarily reflected in the following aspects:

1. Extremely Weak Earthquake Resistance
   Prefabricated panel houses have poor integrity, with a lack of firm connections such as steel bars between the floor slabs and walls, resembling a structure built with building blocks. During an earthquake, horizontal forces can easily cause the floor slabs and walls to separate instantly, with entire prefabricated panels falling directly, significantly reducing escape time and threatening life safety.

2. Vulnerable Connection Points
   Prefabricated panels are simply overlapped with walls, with gaps between panels filled only with cement and lacking rigid framework support such as ring beams and structural columns. When the foundation settles or walls crack, the panels are prone to misalignment and loosening; over time, weathering at the connections and rusting of steel bars lead to a continuous decrease in strength, further weakening structural stability.

3. Widespread Use of Substandard Materials
   While regular prefabricated panels use relatively thin steel bars, some small workshops, to reduce costs, substitute steel bars with thin wire, use concrete with substandard grades, and insufficient thickness. Such prefabricated panels may appear intact but actually have poor impact resistance and obvious brittle failure characteristics, instantly breaking under overload without any warning.

4. Poor Sound Insulation and Thermal Insulation
   Due to material and structural defects, prefabricated panel houses have poor sound insulation, with neighbors' activities clearly audible; thermal insulation is weak, making them hot in summer and cold in winter, requiring additional equipment to regulate temperature and increasing living costs.

5. Limited Internal Structure Modifications
   Walls in prefabricated panel houses mostly serve structural support functions, and large-scale modifications (such as removing walls or enlarging windows) may damage overall stability, limiting residents' ability to adjust living space according to their needs and reducing flexibility.

6. High Risk of Water Seepage
   Over time, cement components are prone to cracks, and gaps between panels widen, leading to frequent water seepage issues between floors, affecting the durability of the house and living experience.

7. Service Life Approaching Its Limit
   Prefabricated panel houses are designed with a service life of about 30-50 years, mostly built in the 1970s-1980s, with some already exceeding their service life. Aging phenomena are widespread, such as concrete carbonation and steel bar rusting, further exacerbating safety hazards.

In conclusion, prefabricated panel houses have obvious defects in structural safety, functionality, and durability, requiring professional inspection and risk assessment, and if necessary, reinforcement, renovation, or replacement.