Evaluation Criteria for Prefabricated Houses
The evaluation criteria for prefabricated houses are primarily based on the 'Standards for Appraisal of Dangerous Buildings' (JGJ 125-2016), which classify building safety into four grades: A, B, C, and D, and conduct a comprehensive assessment from three aspects: structural safety, public facilities, and unauthorized modifications. Details are as follows:
Structural safety is the core of the assessment. Professional inspectors will focus on key components such as foundations, walls, floors, and steel reinforcement. For foundations, it is necessary to check for settlement or cracking; uneven foundation settlement may lead to building tilting or even collapse. Walls should be observed for cracks or deformation, especially at the joints between prefabricated panels; through-cracks may affect the overall structural integrity. Floors should be checked for deflection; if there is a noticeable springy feel when stepping on them, it may indicate insufficient load-bearing capacity. Steel reinforcement should be checked for corrosion; corrosion reduces the strength of the steel and thus affects the durability of the structure. For example, if a horizontal through-crack appears at the joint of prefabricated panels or if the floor shows significant deformation under normal service loads, further inspection and assessment of their impact on structural safety are required.
The assessment of public facilities directly affects living safety and quality of life. It is necessary to check for aging in pipelines such as water pipes and electrical wires; aging pipelines may cause leaks or electrical fires. Check whether waterproofing is失效 (失效 means '失效' in Chinese, here it should be 'ineffective'); ineffective waterproofing, especially in areas such as roofs and bathrooms, can lead to leakage, affecting the building structure and indoor environment. Check whether fire exits are blocked; fire exits are crucial for personnel evacuation and firefighting operations in emergencies, and their occupation or blockage seriously threatens living safety. For example, if the electrical wires in the building are severely aged or if the roof waterproofing layer has large-scale cracks, timely repair or replacement is required.
The assessment of unauthorized modifications aims to identify the impact of human factors on the building structure. It is necessary to check whether anyone has擅自拆除 (擅自拆除 means 'unauthorized removal' in Chinese, here it should be 'removed without authorization') load-bearing walls, added structures on the roof, or converted balconies into kitchens or bathrooms. These actions can alter the original load-bearing structure of the building, leading to insufficient local or overall load-bearing capacity and making the building more vulnerable. For example, if someone removes a load-bearing wall of a prefabricated house without authorization or adds a floor on the roof without design approval, structural safety issues may arise, requiring immediate cessation and restoration to the original state.
