Prefabricated House Grouting Process Standard
The prefabricated house grouting process standard covers aspects such as pre-construction preparation, materials and mixing, construction steps, environmental control, personnel and records, and scope of application, as detailed below:
Pre-construction preparation requires strict control over the base layer condition and material acceptance. First, clean the floor surface to ensure it is free of debris, laitance, dust, oil, and release agents. Moisten the floor thoroughly 24 hours before grouting and absorb any standing water one hour before grouting to prevent dilution of the grout. Second, record in detail the quantity, diameter, and reserved length of the joint reinforcement bars, and thoroughly clean the seating surface, sleeve interior, and joint reinforcement bars to ensure the base layer is free of rust, oil, or loose particles. Additionally, upon arrival of the grout material, check the manufacturer's certificate of conformity and third-party inspection report, and take samples on-site for inspection according to specifications. Only use the material after it passes inspection to prevent substandard materials from entering the construction process.
Materials and mixing require control over the mix ratio and mixing process. The grout material should be mixed mechanically for 1-2 minutes. If mixed manually, first add 2/3 of the water and mix for 2 minutes, then add the remaining water and mix until uniform. The standard consistency water addition is 12%-14%. The mixed grout must pass strength and deformation tests, meeting Grade I standards, with a focus on checking indicators such as strength, deformation, flowability, and durability to ensure the material performance meets design requirements.
Construction steps require standardized operation procedures. The grout should be poured from one side until it overflows from the other side. Immediately after grouting is complete, insert a dedicated rubber stopper. Pouring from all four sides simultaneously is strictly prohibited to avoid air entrapment leading to insufficient compactness. Ensure that the grout material is used exclusively for its intended purpose to prevent mixing, and strictly control the mix ratio to guarantee grouting quality. During construction, the interface can be moistened with water to improve adhesion, and the rotational speed can be controlled to ensure the uniformity and stability of the grout.
Environmental control requires attention to temperature effects. Monitor the ambient temperature during construction. In low-temperature environments, take insulation measures such as covering with insulating materials or using heating equipment to ensure the grout material cures at an appropriate temperature, preventing insufficient strength development or cracking due to low temperatures.
Personnel and records require enhanced accountability tracing. Grouting operations must be performed by specially trained and qualified personnel. Untrained general workers are strictly prohibited from taking over the job. Each member and compartment grouting process must leave traceable records, including the operator, time, and environmental conditions, to ensure quality responsibility is assigned to individuals.
Scope of application and basic requirements clarify the process boundaries. This standard applies to sleeve grouting, grout-anchor lap splicing grouting, and member joint seating grout filling operations for prefabricated shear walls, columns, and composite beams in general civil and small- to medium-sized industrial buildings. Grouting for large prefabricated bridge members or special prefabricated members can be adjusted based on actual conditions but must undergo special论证 (demonstration) to ensure safety.
