How to Reinforce Prefabricated Block Houses

Reinforcing prefabricated panel houses can be achieved through various methods, and the appropriate solution should be selected based on the structural characteristics, damage conditions, and usage requirements of the house. The specific reinforcement methods are as follows:

1. Foundation Reinforcement
For issues such as insufficient foundation bearing capacity or settlement, the stability of the foundation can be enhanced by increasing its size, deepening its depth, or adding steel reinforcement mesh. If the foundation soil is soft, reinforcement agents or foundation sealing materials can be injected to improve seismic performance. For example, adding a concrete ring beam around the existing foundation can effectively disperse the upper loads and reduce the risk of uneven settlement.

2. Structural Reinforcement
Steel beams, columns, or plates can be added to key parts such as walls, stairs, and roofs to form a composite structural system, enhancing overall strength and stiffness. In areas with high seismic demands, reinforced concrete can be injected into the walls to form a confined concrete structure, increasing lateral resistance. For example, adding structural columns at the intersections of longitudinal and transverse walls in brick-concrete houses can significantly improve structural ductility.

3. Seismic Isolation and Damping Reinforcement
Seismic isolation devices, such as rubber isolation bearings or spring isolators, can be installed between the foundation and the structure to reduce seismic force input by extending the natural period of the structure. For multi-story prefabricated panel houses, dampers can be installed at each floor level to dissipate seismic energy and reduce structural deformation. For example, after adopting seismic isolation bearings, the seismic acceleration response of a school building was reduced by more than 60%.

4. Floor Reinforcement
For issues such as insufficient bearing capacity of prefabricated floors, a double-sided reinforcement method can be used: adding a 40mm thick reinforced concrete layer on the surface and bottom of the floor, and achieving coordinated work between the old and new concrete through rebar planting technology. If the floor has openings, the reinforcement method should be selected based on the location of the openings: carbon fiber sheets can be used to reinforce the flexural bearing capacity of openings in the middle of the span, and polymer mortar can be filled to restore the shear resistance of openings at the edges of supports.

5. Wall Reinforcement
For walls with cracks or tilting, a steel reinforcement mesh and mortar surface layer reinforcement method can be used: laying Φ4@200 steel reinforcement mesh on both sides of the wall and spraying M15 polymer mortar to form a composite reinforcement layer. For severely cracked walls, a steel plate bonding reinforcement method can be combined, where steel plates are bonded on both sides of the cracks and anchored with structural adhesive to restore the overall integrity of the wall.

6. Support System Reinforcement
Steel or concrete supports can be added longitudinally or transversely to the house to form a spatial truss system, enhancing the structural resistance to collapse. For example, adding cross steel supports to the gable ends of prefabricated panel houses can effectively resist horizontal seismic forces and prevent wall outward movement.