Prefabricated House Quality Inspection Plan

The prefabricated house quality inspection plan should systematically cover the entire process from component production to factory delivery, ensuring quality and safety through standardized inspections. The specific plan is as follows:

I. Scope of Inspection

The inspection objects cover various components and products throughout the entire supply chain of prefabricated houses, including:

1. Structural Components: Prefabricated concrete wall panels, floor slabs, beams, columns, stairs, balconies, pipe piles; steel structural components, wooden structural components; bridge components, tunnel linings, etc.
2. Functional Units: Assembled bathroom units, kitchen units, partition walls, decorative components.
3. Infrastructure Components: Prefabricated road slabs, power ducts, inspection wells, drainage ditches, etc.

II. Inspection Items

Inspection items should cover multiple dimensions of component performance, including physical, chemical, and durability aspects:

1. Dimensional Deviation Inspection: Use laser rangefinders, 3D scanners, and other equipment to verify whether the geometric dimensions of components meet design drawing requirements, with errors controlled within allowable norms.
2. Appearance Quality Inspection: Combine manual visual inspection with image recognition technology to check for surface defects such as honeycombing, pitting, cracks, holes, and deviations in the position of embedded parts.
3. Physical Performance Inspection:
   • Concrete compressive strength, flexural strength (in accordance with GB/T 50081-2019);
   • Steel reinforcement cover thickness, positional deviation, and mechanical properties (using steel reinforcement scanners, universal material testing machines);
   • Overall load-bearing capacity, deformation performance, and connection node performance of components (verified through structural testing).
4. Chemical Performance Inspection: Use chloride ion content meters to measure chloride ion content in concrete, assessing the risk of steel reinforcement corrosion.
5. Durability Inspection: Includes impermeability (concrete impermeability tests), frost resistance (freeze-thaw cycle tests), carbonation depth (carbonation depth meters), etc., simulating performance degradation under long-term environmental effects.
6. Other Special Performance Inspections: Depending on the usage scenario, inspect fire resistance, sound insulation, thermal insulation, and seismic performance (e.g., vibration table tests).

III. Inspection Methods and Equipment

Inspections should follow national standards, employing a combination of non-destructive and destructive methods:

1. On-site Inspection:
   • Concrete strength: Rebound method (concrete rebound meters) or ultrasonic method (ultrasonic testing instruments);
   • Internal defects: Ultrasonic testing or radar scanning;
   • Dimensional measurement: Laser rangefinders, 3D scanners.
2. Laboratory Inspection:
   • Compressive/flexural strength: Universal material testing machines;
   • Chloride ion content: Chemical titration or ion-selective electrode methods;
   • Carbonation depth: Phenolphthalein reagent spraying method.

IV. Implementation Process

1. Commissioning and Liaison: Clarify the scope, purpose, and standard requirements of the inspection.
2. Preliminary Investigation: Review design documents and production records, and conduct on-site inspections of component storage environments and production processes.
3. On-site Inspection: Collect data according to the plan and record any abnormalities (e.g., crack development, corrosion marks).
4. Laboratory Analysis: Perform precise testing on samples collected on-site to generate material performance reports.
5. Data Processing and Evaluation: Integrate on-site and laboratory data to issue a quality inspection report and propose rectification recommendations.

Through the above process, the quality reliability of prefabricated house components can be comprehensively evaluated, providing a scientific basis for engineering safety.