Wall Deformation in Prefabricated Panel Houses

Wall deformation in prefabricated panel houses may involve serious safety hazards and requires comprehensive assessment based on crack characteristics, settlement signs, and joint connection conditions. If necessary, immediately commission a professional agency for evaluation and take appropriate measures.

1. Key Points for Inspecting Load-Bearing Wall Cracks

Load-bearing walls are the core supports of a house structure, and the shape of their cracks directly reflects structural safety.

• Vertical Cracks: If cracks develop vertically along the wall, especially through-cracks, they may be caused by insufficient wall bearing capacity or foundation settlement. It is essential to check whether the crack width continues to expand.
• Diagonal Cracks: Diagonal cracks (e.g., at a 45° angle) at the intersections of longitudinal and transverse walls or around door and window openings are typical danger signals. They may be caused by shear failure of the wall or uneven foundation settlement, requiring immediate assessment of crack depth and development speed.
• Cracks at Lintels: If cracks or downward deformation occur at the lintels above door and window openings, it indicates insufficient lintel bearing capacity, which may lead to local collapse risks.

2. Typical Manifestations of Uneven Foundation Settlement

Foundation settlement is a common cause of wall deformation and requires comprehensive judgment based on ground and wall signs.

• Ground Settlement Marks: Check for obvious subsidence, cracking, or water accumulation on the ground around the house, and whether there are height differences between indoor and outdoor ground (e.g., step-like settlement).
• Cracks at the Bottom of Walls: If diagonal cracks appear at the bottom of walls (usually extending upwards from the bottom) and the crack width is wider at the top and narrower at the bottom, it indicates that local foundation settlement has caused tensile failure of the wall.
• Overall Tilt: Use a plumb bob or level to detect whether the wall is tilted. If the tilt rate exceeds the allowable value specified in the code (e.g., 4‰), immediate reinforcement measures are required.

3. Stability Impact of Joint Connection Issues

The connection quality at wall corners and intersections directly affects the overall integrity of the house.

• Detachment or Cracks: If obvious detachment (gap width > 5mm) or cracks occur at wall corners or the intersections of longitudinal and transverse walls, it indicates joint connection failure, which may trigger structural chain failure.
• Tie Between Structural Columns and Walls: Check whether tie bars are installed between structural columns and walls. If tie bars are missing or corroded and broken, it will reduce the wall's shear resistance and exacerbate deformation risks.

4. Emergency Handling Measures

If wall deformation is accompanied by the following conditions, immediately commission a professional agency for evaluation:

• Doors and Windows Stuck and Unable to Open Normally: Indicates that structural deformation has affected functionality;
• Obvious Deflection or Cracks in Floor Slabs: May be caused by failure of prefabricated panel connections or support settlement;
• Concrete Spalling or Exposed Reinforcement: Indicates that the bearing capacity of the component is severely insufficient, posing a collapse risk. Based on the evaluation results (e.g., Class C local danger requiring reinforcement, Class D overall danger requiring demolition), take measures such as repair and reinforcement (e.g., carbon fiber cloth reinforcement, additional supports) or demolition and reconstruction to ensure living safety.