Prefabricated Panels for House Foundations
The use of prefabricated panels for house foundations is commonly seen in rural self-built houses, primarily serving as a basic moisture-proofing measure, but it has certain limitations and is gradually being phased out.
Moisture-Proofing Principle of Prefabricated Panels for Foundations
The core principle of using prefabricated panels for foundation moisture-proofing is to "exchange space for dryness." Specifically, a prefabricated panel elevated layer is constructed on the ground ring beam. After the ground beam is poured, the height of the backfill soil is controlled to be 30-50 centimeters above the ground and compacted to form a cavity. When underground moisture rises to the cavity, it naturally dissipates due to the open space and cannot continue to rise to the first-floor ground, effectively preventing ground moisture. This design physically isolates the moisture path and can significantly improve indoor humidity in humid climates or areas with high groundwater levels.
Specific Practices for Using Prefabricated Panels for Foundations
The construction process must strictly adhere to specifications: First, complete the pouring of the ground ring beam to ensure a stable foundation structure; then, carry out backfilling operations, controlling the backfill height within the range of 30-50 centimeters and using mechanical or manual compaction to avoid soil loosening that could cause deformation of the elevated layer; finally, lay the prefabricated panels, leaving gaps between the panels to accommodate expansion and contraction caused by temperature changes. At the same time, use cement mortar or a special sealant to treat the gaps to prevent moisture from seeping through the joints.
Limitations of Using Prefabricated Panels for Foundations
- Prominent Safety Hazards: Prefabricated panels are prefabricated components connected by joints, with gaps at the edges. Under external forces such as earthquakes, the joints are prone to breakage, leading to instability or even collapse of the overall house structure.
- Obvious Functional Defects: The gaps between the panels result in poor sound insulation, affecting living comfort; improper waterproofing can lead to leakage problems, and long-term leakage can corrode the foundation structure; moisture may seep into the interior from the gaps or the edges of the incompletely sealed elevated layer, reducing the moisture-proofing effect.
- Technological Obsolescence: Modern house construction generally adopts frame structures or reinforced concrete structures, which form seamless structures through integral pouring, fundamentally solving problems such as moisture-proofing, earthquake resistance, and sound insulation. Prefabricated panels have gradually been phased out due to their outdated technology.
