Dongzhi Prefabricated Houses

Prefabricated houses in Dongzhi County are key targets for safety hazard inspection and assessment among surrounding construction houses, requiring priority safety performance testing and corresponding measures based on the assessment results.

Prefabricated houses (prefabricated panel houses) have unique characteristics in the safety hazard inspection in Dongzhi County. These houses are mostly constructed by assembling prefabricated concrete components. Due to the long-term exposure of building materials to the natural environment, they are susceptible to factors such as rain, weathering, and temperature changes, leading to the degradation of structural performance. Common issues include wall cracking, beam and column deformation, and reduced load-bearing capacity, which can lead to overall collapse in severe cases. For example, cracks at the joints of prefabricated panels are prone to expansion due to long-term stress, and foundation settlement may cause house tilting, all of which require professional inspection to assess risks.

According to inspection and assessment requirements, prefabricated houses need to undergo three core inspections on a priority basis:

1. Structural load-bearing capacity assessment: Verify whether the load-bearing capacity of beams, panels, columns, and other components meets current regulatory requirements through computational models or on-site load tests, with particular attention to the strength of prefabricated panel joints.
2. Crack and deformation monitoring: Use crack width gauges, total stations, and other tools to quantify the width of wall cracks, the degree of beam and column bending, and the overall tilt rate of the house to determine whether they exceed safety limits.
3. Foundation inspection: Evaluate foundation bearing capacity and settlement stability through methods such as drilling sampling and static cone penetration to rule out the risk of structural instability caused by foundation softening.

The assessment results directly determine the disposal methods:

• If assessed as Class C partially dilapidated houses: Reinforcement measures need to be taken for damaged components, such as pasting carbon fiber sheets to enhance the flexural capacity of beams and panels, adding steel supports to improve overall structural integrity, or grouting reinforcement for the foundation.
• If assessed as Class D whole dilapidated houses: They must be immediately taken out of use and demolished to avoid personal injury accidents. A special plan needs to be formulated before demolition to ensure the safety of the surrounding environment.

The safety management of prefabricated houses should combine regular inspections with dynamic monitoring. Especially for old houses with a service life of more than 30 years, the inspection cycle should be shortened, and a 'one-house-one-file' management ledger should be established to safeguard the lives and property of residents.