Evaluation of Prefabricated Houses

The evaluation of prefabricated houses primarily focuses on building safety assessments, which are divided into four grades according to the 'Building Safety Assessment Standard' (JGJ125-2016). Detailed safety assessments and approval and publicity procedures must be carried out before demolition.

I. Classification of Building Safety Assessment Grades According to the 'Building Safety Assessment Standard' (JGJ125-2016), the safety grades of prefabricated houses are divided into the following four categories:

1. Grade A: The structural load-bearing capacity fully meets normal usage requirements, and no hazardous points are found. Such buildings do not require reinforcement or demolition and can continue to be used safely.
2. Grade B: Some components show aging or minor damage (such as wall cracks, beam and column corrosion), but this does not affect the safety of the main structure. Aging components need to be regularly monitored, and local repairs should be carried out when necessary.
3. Grade C: Some load-bearing structures (such as prefabricated panels and load-bearing walls) have insufficient load-bearing capacity and are considered partially hazardous buildings. The preferred solution is reinforcement, and demolition should only be considered when the reinforcement cost exceeds 70% of the reconstruction cost.
4. Grade D: The load-bearing structure is severely damaged (such as foundation settlement, main structure tilting), and the entire building is in a dangerous state. Immediate demolition is required to avoid collapse risks.

II. Safety Assessment Requirements Before Demolition of Prefabricated Panel Buildings If a building is assessed as Grade C or D and requires demolition, the following procedures must be strictly followed:

1. Structural Safety Assessment: Professional institutions should conduct detailed assessments of key parts such as walls, floors, and foundations, analyzing potential safety hazards to surrounding buildings (such as adjacent buildings, underground pipelines) and residents during the demolition process (such as vibration, collapse).
2. Issuing a Safety Assessment Report: The report should clarify the current structural condition of the building, the location and extent of safety hazards, and propose demolition technical solutions (such as segmental demolition, support reinforcement) and safety protection measures (such as setting up warning zones, monitoring settlement).
3. Government Approval and Publicity: The demolition plan must be approved by departments such as housing and urban-rural development and planning, and residents should be informed through community announcements, media publicity, etc., with their opinions fully heard. If residents have objections to the assessment results or demolition plan, they can apply for a review or hearing.

III. Core Principles of Assessment and Demolition The assessment of prefabricated houses should be based on scientific testing data to avoid subjective judgments; demolition decisions should balance safety, economy, and social impact, prioritizing the protection of residents' lives and property. For example, if reinforcement is feasible for a Grade C building, blind demolition should be avoided to prevent resource waste; for a Grade D building, decisive action should be taken to prevent accidents from escalating.