How to Reinforce Prefabricated Houses

Reinforcing prefabricated houses can enhance overall strength and stability through various measures such as foundation reinforcement, structural reinforcement, and seismic isolation. The specific methods are as follows:

1. Foundation Reinforcement
The foundation is the core of a house's stability, and the reinforcement method should be selected based on geological conditions. Enlarging the foundation size or deepening the foundation can enhance the bearing capacity of the ground and prevent settlement; adding steel mesh can improve the overall integrity of the foundation; injecting reinforcing agents or sealing materials can fill soil pores and improve seismic performance. For example, in soft soil foundations, deepening the foundation combined with steel mesh reinforcement can significantly reduce the risk of displacement during earthquakes.

2. Structural Reinforcement
For key components such as walls, stairs, and roofs, it is necessary to enhance strength by adding components or materials.

• Adding steel components: Install steel beams, columns, or plates at positions such as walls and beams to form a composite structure, enhancing bending and shear resistance.
• Wall grouting: Inject reinforced concrete into the interior of walls to form a "sandwich wall" and improve seismic performance.
• Exterior metal frames: Add metal frames around the house and fix them to the main structure with connectors to enhance overall stability.
• Frame sealing treatment: Fill reinforcing agents or sealing materials at frame joints to reduce stress concentration during earthquakes.

3. Seismic Isolation Reinforcement
Reduce the transmission of seismic energy by installing seismic isolation devices. Spring isolators or rubber isolators can be placed between the foundation and the house to form a flexible isolation layer, reducing horizontal and vertical seismic forces. For example, some prefabricated houses in Japan use rubber isolation bearings, which can reduce house displacement by 50%-80% during earthquakes.

4. Floor Reinforcement
For issues of insufficient load-bearing capacity of prefabricated floors, the following methods can be used:

• Increasing the cross-section: Pour a reinforced concrete layer of more than 40 mm on the surface or bottom of the floor to enhance bending resistance.
• Sticking carbon fiber cloth: Stick carbon fiber cloth along the force direction of the floor, with anchor points set at the top, suitable for scenarios with less load increase; the bottom of hollow slabs can be directly stuck.
• Sticking steel plates: Stick steel plates on the surface of flexural members, but note that the steel plates are prone to peeling from the concrete and need to be fixed with anchor bolts.

5. Other Reinforcement Methods

• Grouting reinforcement: Inject cement-based grouting materials into cracks in walls or foundations to fill voids and enhance overall integrity.
• Steel mesh reinforcement: Lay steel mesh on the surface of walls or floors and spray concrete to cover it, forming a composite structure.
• Adding supports: Add diagonal or horizontal supports to walls or roofs to disperse loads and prevent deformation.

The reinforcement plan should be comprehensively designed based on the house's structural type, degree of damage, and usage requirements. It is recommended to commission a professional institution to conduct structural testing before implementation.