How to Lay the Foundation for Prefabricated Houses

The foundation construction for prefabricated houses mainly includes the following steps:

Site Preparation and Surveying:
First, the site needs to be leveled, with obstacles such as stones and weeds on the surface cleared away, and ground depressions filled with soil to ensure a flat foundation surface. Subsequently, precise line-setting is carried out using surveying instruments, including control point lines, exterior wall lines, excavation lines, etc., to clarify the foundation position and dimensions, providing a reference for subsequent construction.

Foundation Trench Excavation and Foundation Treatment:
After confirming the soil conditions of the foundation through excavator probing, the foundation trench is excavated according to the construction drawings, with strict control over the depth and width (varying according to different prefabricated houses). After excavation, foundation cushion construction is required: pour concrete into the foundation pit and level it. The cushion formwork must be stable and reliable, and the concrete pouring must meet the design strength requirements. If the soil conditions are good (such as clayey soil), supporting concrete cast-in-place piles can be selected as the foundation connection method.

Reinforcement and Drainage Treatment:
The reinforcement work is carried out in two steps: first, bind the reinforcement bars, arranging them according to the design and fixing them with iron wires; second, accurately place the prefabricated reinforcement cages to ensure that the perpendicularity meets the standards. At the same time, groundwater issues need to be addressed: use open drainage methods (setting up drainage ditches and sump pits, pumping water with water pumps) or artificial groundwater lowering methods (pumping water with well-point dewatering systems) to remove accumulated water and take anti-backflow measures.

Concrete Pouring and Reinforcement:
After formwork erection, pour concrete, which forms the foundation main body after solidification. If the foundation bearing capacity is insufficient, reinforcement methods can be adopted:

• Compaction Method: Compact the soil layer with a pneumatic hammer or heavy-duty road roller to increase soil density;
• Soil Replacement Method: Replace loose soil with high-density materials (such as sand and gravel), but the cost is relatively high;
• Piling Method: Embed reinforced concrete piles to increase stability, suitable for small buildings.

Quality Inspection:
After the foundation is completed, foundation tests such as pile foundation inspection and static load tests need to be carried out to verify the bearing capacity and stability and ensure the safety of the building.

Precautions:
Throughout the construction process, strict adherence to design specifications is required, especially for key parameters such as foundation trench dimensions, reinforcement bar arrangement, and concrete strength. If special soil conditions are encountered (such as soft soil or collapsible loess), the construction plan needs to be adjusted in conjunction with a professional geological report.