Will the House Crack When Removing the Ground of a Prefabricated Panel House?

When removing the ground of a prefabricated panel house, improper operation may lead to house cracking, but it is not inevitable. A comprehensive assessment needs to be made based on the house's condition and construction methods.

Impact Mechanism of Removal on Prefabricated Panel Houses

The structural characteristics of prefabricated panel houses determine their vulnerability to cracking. These houses are assembled from prefabricated concrete panels, which are fixed together through simple connections such as steel bar nesting or cement mortar filling. They lack the continuity and stability of monolithic cast-in-place structures. During ground removal, if tools like impact drills or electric pickaxes are used to vertically strike the ground directly, the resulting vibrations will be transmitted through the floor to the entire structural system. Since the joints between prefabricated panels are structural weak points, vibrations may cause the connection parts to loosen, cracks to expand, and even lead to the separation of the floor from the walls.

Specific Risk Scenarios of Improper Operation

1. Tool Selection and Construction Methods: Impact drills or electric pickaxes used vertically on the ground will directly apply impact forces to the floor, damaging the bond between the steel bars and concrete inside the prefabricated panels. If the removal area is large (e.g., the entire house's ground), the cumulative effect of vibrations may cause slight deformation of the floor, leading to wall cracks or the expansion of existing cracks.
2. House Foundation Condition: If the prefabricated panel house already has issues such as wall cracks, foundation settlement, or weak seismic resistance (e.g., old houses or buildings constructed without proper standards), the vibrations during ground removal can become the final straw, accelerating structural damage.
3. Removal Depth and Scope: Removing only surface floor tiles (such as ceramic tiles or wooden floors) with gentle operation has a relatively small impact on the structure. However, if it is necessary to chisel away the cement mortar layer or go deeper into the floor's structural layer, it may directly weaken the floor's load-bearing capacity and increase the risk of cracking.

Recommended Measures to Reduce Risks

1. Pre-construction Assessment: Commission a professional agency to inspect the house's structural condition, focusing on checking for potential issues at the joints between prefabricated panels and the connections between walls and floors.
2. Optimize Construction Methods: Avoid using impact tools and instead use manual gentle tapping or small cutting machines for segmented removal. Control the area of each operation to reduce the cumulative effect of vibrations.
3. Strengthen Structural Protection: Set up temporary supports (such as steel pipe scaffolding) below the floor to distribute the load during removal. Reinforce existing cracks (e.g., with carbon fiber cloth) before construction.