Pouring of Prefabricated Panel Houses
The "prefabricated panel + cast-in-place strip combination" approach can be used for pouring prefabricated panel houses, but directly pouring ring beams without removing the prefabricated panels in single-story houses is not feasible.
Prefabricated Panel + Cast-in-Place Strip Combination Approach
The "prefabricated panel + cast-in-place strip combination" approach is a cost-effective and safe method. This approach uses cast-in-place concrete strips to "lock" the scattered prefabricated panels into a single unit, enhancing the overall integrity and stability of the house structure. When creating cast-in-place strips, the choice of location is crucial. The cast-in-place strips must be placed directly above the load-bearing walls, as these walls are the main support components of the house structure. Placing the strips directly above them allows for better load transfer and ensures reasonable structural stress distribution. Additionally, cast-in-place strips must be installed at all joints between prefabricated panels to prevent cracks from forming at these joints and improve the house's crack resistance. The width of the cast-in-place strips is generally controlled between 15 and 20 centimeters, a range that meets structural connection requirements without causing material waste.
Drawbacks of Directly Pouring Ring Beams Without Removing Prefabricated Panels in Single-Story Houses
Directly pouring ring beams without removing the prefabricated panels in single-story houses is generally not feasible and poses numerous structural safety hazards and construction quality risks. Direct pouring can lead to issues such as delamination, hollowing, and leakage. This is because the surfaces of the prefabricated panels may contain dust, oil, and other impurities, resulting in poor adhesion between the panels and the cast-in-place concrete and making delamination more likely. Additionally, if the pouring process is not vibrated densely, hollowing can occur, leading to leakage. The hardening process of the cast-in-place concrete is susceptible to interference, making quality control difficult. For example, during construction, external factors such as temperature and humidity can affect the concrete, causing uneven shrinkage and resulting in cracks. The prefabricated panels and walls do not form a single unit, reducing disaster resistance. In the event of natural disasters such as earthquakes or strong winds, the house is prone to collapse and other serious accidents. The lack of reinforcement measures poses safety hazards. Directly pouring ring beams without effectively connecting and reinforcing the prefabricated panels and walls cannot guarantee the stability of the house structure.
If renovations are needed for a single-story house, a qualified construction team should be commissioned to enhance the overall integrity through measures such as adding ring beams, constructional columns, steel bar planting, or replacing the roof structure. Before renovation, a structural inspection should be conducted to ensure the plan complies with relevant standards, and the necessary approval procedures should be completed.
