Foundation Requirements for Cement Prefabricated Houses
The foundation requirements for cement prefabricated houses mainly include bearing capacity, stability, flatness, waterproof performance, and material and construction specifications.
Bearing Capacity: The foundation must have sufficient bearing capacity to support the entire weight of the house, including the self-weight of prefabricated components, walls, floors, and other structural elements, as well as live loads during use. For sites with poor geological conditions, such as soft soil foundations (silt, clay, etc.), reinforcement measures are necessary due to insufficient natural bearing capacity. Common reinforcement methods include replacement method, which involves excavating the weak soil layer and replacing it with higher-strength materials such as sand and gravel or lime-soil; compaction method, which improves foundation density through mechanical rolling or vibration compaction; and pile foundation, which utilizes piles to transfer loads to deeper soil layers or rock formations to enhance foundation bearing capacity.
Stability: The foundation must remain stable to prevent tilting or settlement under external forces such as earthquakes and wind. During design, appropriate foundation types, such as strip foundations, isolated foundations, or raft foundations, should be selected based on the house's structural form, geological conditions, and load conditions. Additionally, foundation dimensions and reinforcement must comply with design requirements to ensure sufficient flexural and shear resistance, preventing structural damage caused by external forces.
Flatness: The foundation surface must be flat, with errors controlled within specified limits, to ensure accurate installation of prefabricated components and structural safety. If the foundation is uneven, it may lead to difficulties in house installation, loose connections between components, and even structural cracks. During construction, precise measurements should be taken using tools such as level gauges, and uneven areas should be leveled.
Waterproof Performance: Proper waterproofing of the foundation is necessary to prevent erosion by groundwater and rainwater. This can be achieved by installing a waterproof layer, such as laying waterproof membranes or applying waterproof coatings, to block water penetration. Additionally, drainage facilities, such as drainage ditches and collection wells, should be improved to promptly remove surface water and groundwater, preventing corrosion or softening of foundation materials that could affect bearing capacity.
Material and Construction Specifications: Materials such as cement and steel bars used should comply with relevant national standards to ensure reliable material quality. The buried depth of the foundation must consider factors such as geological conditions, groundwater level, and frost depth to ensure foundation stability. The construction process should follow specifications, including foundation treatment and foundation construction, with attention to detail, such as steel bar tying and concrete pouring, to ensure construction quality meets design requirements.
