Foundation Requirements for Prefabricated Houses
Whether a prefabricated house requires foundation excavation depends on specific circumstances. The following provides a detailed explanation from different perspectives:
Influence of the Characteristics of the Prefabricated Components
The size and weight of concrete prefabricated components are key factors determining whether foundation excavation is necessary. When the prefabricated components are relatively light and small, the pressure they exert on the ground due to their own weight and volume is relatively low. In this case, it is only necessary to lay a thick layer of sand or a cushion on the ground. This layer of sand or cushion can provide a certain degree of cushioning and stability, allowing the prefabricated components to be placed relatively firmly on the ground and meeting the usage requirements of some small and light prefabricated houses, such as small temporary buildings and simple warehouses.
However, if the prefabricated components are very large and heavy, simply laying sand or a cushion cannot meet their stability requirements. Due to the excessive weight, the prefabricated components may sink or tilt due to insufficient ground bearing capacity, affecting the safety and normal use of the house. In this situation, it is necessary to excavate a foundation in addition to laying sand or a cushion. By excavating a foundation, the weight of the prefabricated components can be evenly transferred to deeper and more solid soil layers, ensuring that the prefabricated components are firmly and stably fixed on the ground and safeguarding the structural safety of the house. Large industrial plants and multi-story prefabricated houses usually require such treatment.
Special Requirements for Building Multi-Story Prefabricated Houses
When constructing a three-story prefabricated house, the requirements for the foundation are more stringent. The excavation depth of the foundation should be determined according to the geological conditions and should continue until a hard stratum is reached. This is because the geological conditions vary greatly in different regions. Only by excavating to a hard stratum can the foundation have sufficient bearing capacity to avoid safety hazards such as cracks and tilting of the house due to foundation settlement during use. At the same time, the width of the foundation should preferably be slightly wider than the designed width, at least reaching 1 to 1.2 meters. A wider foundation can increase the contact area between the house and the ground, further improving the stability of the house and enhancing its ability to resist various external forces (such as wind and earthquake forces).
