Quality Standards for Prefabricated Concrete Houses
The quality standards for prefabricated concrete houses cover aspects such as foundations and substructures, main structures, material usage, construction specifications, acceptance criteria, and other industry-standard measurement dimensions.
Foundations and Substructures: The foundation must possess sufficient load-bearing capacity, with reinforcement measures such as pile foundations or soil replacement layers implemented based on geological conditions. The depth of foundation embedding should take into account factors such as geological conditions, groundwater levels, and permafrost depth to ensure foundation stability. Additionally, materials like cement and steel bars used should comply with relevant national standards and design requirements to guarantee the strength and durability of the foundation and substructure.
Main Structures: Structural design should be reasonable, with the dimensions, reinforcement, and connection methods of structural components meeting seismic fortification requirements and relevant codes, following GB 50010-2010 'Code for Design of Concrete Structures' and GB 50009-2012 'Load Code for the Design of Building Structures'. The production of prefabricated concrete components should adhere to relevant codes to ensure dimensional accuracy, strength, and durability, with secure and reliable connections between components.
Material Usage: Cement should be of qualified quality, with its strength grade, soundness, and other indicators meeting the requirements of GB 175-2007 'Common Portland Cement'. In addition to cement, materials like sand, gravel, and steel bars should also comply with relevant national standards and design requirements. Steel bars should conform to the provisions of GB/T 1499.2-2018 'Steel for the Reinforcement of Concrete - Part 2: Hot Rolled Ribbed Bars', while aggregates should meet the requirements of GB/T 14684-2011 'Sand for Building' and GB/T 14685-2011 'Pebble and Crushed Stone for Building'.
Construction Specifications: Construction should follow a reasonable process, including foundation treatment, foundation construction, installation of prefabricated components, roofing, and waterproofing works. Construction techniques should comply with GB 50666-2011 'Code for Construction of Concrete Structures' and JGJ 1-2014 'Technical Specification for Prefabricated Concrete Structures'. Attention should also be paid to construction details, such as the splicing of prefabricated components and the laying of waterproof layers.
Acceptance Criteria: After the completion of the house, a comprehensive quality inspection should be conducted in accordance with GB 50204-2015 'Code for Acceptance of Constructional Quality of Concrete Structures'. Inspection items include dimensional deviations of components, appearance quality, and strength testing.
Other Industry-Standard Measurement Dimensions: The mainstream wall thickness specifications are 15 cm and 20 cm; the concrete strength grade should comply with relevant standards; the steel bar reinforcement ratio should follow the design institute's drawings; and the steam curing process should be properly implemented.
