Prefabricated House Grouting Process

The grouting process for prefabricated houses is a crucial step in ensuring the connection strength and structural safety of prefabricated components. Its core procedures include construction preparation, core operations, quality control, and problem handling.

I. Pre-construction Preparation

1. Technical and Personnel Preparation
   Prior to construction, special briefings must be conducted to clarify the number of grouting sleeves, the positions of inlet/outlet holes, and the component division rules. Grouting workers must undergo professional training and possess relevant project experience to ensure operational standardization.

2. Material and Equipment Inspection

   • Component Inspection: Verify that grouting sleeves are unobstructed and that component installation deviations are within allowable limits (e.g., verticality and flatness).
   • Grouting Material Inspection: Check the expiration date and packaging integrity to avoid using damaged or caked materials.
   • Equipment Selection: Choose handheld electric mixers or vertical forced mixers based on batch size, and inspect equipment operation to ensure mixing efficiency.

II. Core Construction Procedures

1. Floor Surface Treatment

   • Remove debris such as crushed stone, laitance, and oil stains. Moisten the floor surface 24 hours before grouting and absorb excess water 1 hour before grouting to prevent moisture from affecting grout performance.

2. Grouting Material Mixing

   • Mechanical Mixing: Control the mixing time to 1-2 minutes to ensure uniformity.
   • Manual Mixing: First, add 2/3 of the water and mix for 2 minutes, then add the remaining water and mix to the standard consistency (water addition of 12%-14%).
   • Pre-treatment: Before mixing, verify the raw material model and expiration date, and adjust the water amount according to ambient temperature (e.g., reduce water in high temperatures to prevent rapid setting).

3. Grouting Operations

   • Inject the grout from one side and immediately plug the outlet with a dedicated rubber stopper when the other side overflows. Simultaneous grouting from all four sides is prohibited to prevent air entrapment and incomplete compaction.
   • Continuously monitor the outlet status during grouting to ensure full grout penetration.

III. Quality Control Points

1. Mixing Quality Monitoring
   Avoid insufficient mixing time or excessive water addition, which can lead to incomplete grouting and insufficient joint strength.
2. Water-Cement Ratio Control
   Use a measuring bucket with clear markings to accurately measure water, ensuring the water-cement ratio meets design requirements (typically 0.12-0.14).

IV. Common Problem Handling

If testing fails due to shoddy workmanship or non-compliant operations, secondary grouting or partial rework may be required; in severe cases, the entire wall may need to be demolished and rebuilt. Key measures include strengthening construction management, regularly sampling and inspecting grout compactness, and establishing a responsibility tracing mechanism to ensure each procedure complies with standards.