Prefabricated House Acceptance Specifications

The Prefabricated House Acceptance Specifications cover six core aspects: delivery milestones, component precision, installation quality, on-site inspection, roofing works, and industry standards. Details are as follows:

1. Delivery Milestones and Acceptance Criteria
Acceptance should cover all key milestones throughout the process, including plan finalization, production scheduling, factory acceptance, packing lists, transportation plans, on-site conditions, installation, utility coordination, waterproof sealing, and final delivery acceptance. Clear criteria should be established for each milestone. For example, factory acceptance should confirm the integrity of components and the status of embedded parts, transportation plans should assess the impact of routes on components, and waterproof sealing should be verified through water spray tests.

2. Precision Control of Prefabricated Components

• Geometric Dimensions: The length, width, and thickness deviations of components such as wall panels and floor slabs should be ≤ ±3mm, with diagonal errors ≤ 5mm.
• Embedded Part Positions: The positioning deviations of sleeves and rebar should be ≤ ±2mm to ensure reliable subsequent connections.
• Surface Flatness: The flatness deviation of component surfaces within a 2m range should be < 3mm to avoid misalignment after installation.
• Inspection Methods: Full-size verification should be conducted using total stations and 3D scanners, with spot checks and data retention required for complex joints.

3. On-Site Installation Quality Acceptance Criteria

• Temporary Support and Verticality: The stiffness of supports after lifting should meet design requirements, with verticality deviations < H/1000 (H being the component height) and ≤ 10mm.
• Grout Fullness: The fullness of sleeve grout should be ≥ 95%, with grouting pressure maintained at 0.2-0.4MPa and pressure-time curves recorded.
• Levelness Control: The cumulative levelness deviation of each floor slab should be ≤ 10mm to avoid cumulative errors affecting structural safety.
• Concealed Works: Wear on embedded lifting rings, rust treatment of exposed rebar, and other concealed aspects should be included in the acceptance checklist to ensure quality.

4. On-Site Inspection and Testing Requirements for Concrete Prefabricated Components

• Structural Performance Testing: Flexural components (such as stairs, floor slabs, and beams) with spans below a certain size may be exempt from testing but should be verified through on-site supervision or physical testing as alternatives.
• On-Site Inspection: Components not subjected to structural performance testing should undergo on-site supervision or physical testing, focusing on indicators such as concrete strength and rebar cover thickness.

5. Roofing Work Quality Acceptance Specifications
The national standard "Roofing Work Quality Acceptance Specifications" (GB50207-2012) should be strictly implemented, with a focus on key sub-projects such as waterproofing layers, insulation layers, and drainage systems to ensure no leakage and smooth drainage on roofs.

6. Industry Standards and Specifications
In addition to the above standards, reference should be made to the "Technical Standard for Prefabricated Steel Structure Buildings" (GB/T 51232-2016) and the "Unified Standard for Constructional Quality Acceptance of Building Engineering" (GB 50300-2013). For special projects (such as high-rise buildings or areas with high seismic fortification requirements), acceptance criteria should be further tightened according to local standards or design requirements.