Reinforcement Methods for Prefabricated Floor Slabs in Houses

The reinforcement methods for prefabricated floor slabs in houses mainly include the following:

I. For cases with a slight increase in load If the prefabricated slab requires reinforcement due to a slight increase in load, carbon fiber can be directly adhered to the bottom of the hollow slab. Carbon fiber, characterized by its high strength and lightweight properties, can effectively enhance the slab's flexural capacity when adhered to the bottom with a specialized adhesive. This method is convenient for construction and causes minimal damage to the original structure.

II. Methods for altering the load-bearing system Steel beams can be added beneath the slab to share the load with the prefabricated slab, thereby altering the original load-bearing mode of the hollow slab. The steel beams can分担 (share) part of the load, reducing the stress level in the prefabricated slab. This method is suitable for cases with a significant increase in load or insufficient load-bearing capacity of the original slab. During construction, it is essential to ensure reliable connections between the steel beams and the prefabricated slab to avoid local stress concentrations.

III. Grouting and steel mesh reinforcement methods

1. Grouting reinforcement method: High-strength grouting material is injected into walls or foundations to fill voids and enhance overall integrity. This method can improve the structure's seismic performance, prevent deformation or crack propagation, and is suitable for cases of foundation settlement or loose walls.
2. Steel mesh reinforcement method: Steel mesh is laid on the surface of walls or floor slabs and covered with sprayed concrete or plaster. The steel mesh forms a composite system with the original structure, significantly enhancing shear and flexural capacities. This method is commonly used for crack repair or load-bearing capacity enhancement.

IV. Steel plate bonding reinforcement method Steel plates are bonded to cracks in walls or floor slabs using structural adhesive, integrating the plates with the original components. The steel plates can bear part of the tensile stress, inhibiting crack development. This method is suitable for cases with insufficient local load-bearing capacity or significant deformation. During construction, it is crucial to ensure the steel plates are flat, the adhesive layer is uniform, and proper corrosion protection is applied.

V. Foundation reinforcement methods

1. Enlarge the foundation size or deepen the foundation to increase the contact area and enhance load-bearing capacity.
2. Install steel mesh or incorporate reinforcement agents into the foundation to strengthen the concrete.
3. Use foundation sealing materials to prevent water erosion and improve seismic capacity. This method is suitable for cases with insufficient foundation load-bearing capacity or uneven settlement.

VI. Additional support reinforcement method Steel supports, diagonal braces, or concrete columns are added to directly share the load from walls or roofs. The support structures must be reliably connected to the original components to form a stable load-bearing system. This method is suitable for prefabricated slab buildings with insufficient overall stability.

VII. Reinforcement for insufficient bearing length If the bearing length of the prefabricated slab is insufficient, angle steel supports can be added on both sides of the slab joint, and through-bolts can be installed by drilling holes for tensioning. The angle steel provides additional support points, while the bolts ensure overall integrity, preventing slab end slippage or fracture.

VIII. Reinforcement measures for floor slab openings If the opening is located at the mid-span of the floor slab, equal-strength carbon fiber sheets should be adhered to both sides of the hole. The carbon fiber sheets can compensate for the cross-sectional loss caused by the opening and restore flexural capacity. During construction, it is essential to ensure the adhesion direction aligns with the principal stress direction and meets the required overlap length.