Renovation of Prefabricated Floor Slab Houses

The renovation of prefabricated floor slab houses should be systematically carried out from four aspects: structural safety, waterproofing, appearance and functionality, and renovation paths. The specific measures are as follows:

1. Structural Safety Assessment and Reinforcement
Before renovation, a professional agency should be commissioned to conduct a comprehensive structural safety assessment, focusing on inspecting the crack width and connection status of the prefabricated slabs. If the crack width exceeds 0.3 millimeters, the original filling material should be removed, No. 6 deformed steel bars should be implanted, and C30 fine aggregate concrete should be poured. If the rust rate of the connecting bolts between the prefabricated slabs and the ring beams exceeds 30%, new bolts must be replaced. Before construction, a temporary support system should be erected, with steel pipe supports set every 1.2 meters along the length of the prefabricated slabs, and key nodes should be underpinned with H-section steel beams to ensure structural stability during construction. In addition, structural columns should be added at the four corners of the house and connected to the floor slabs to enhance overall seismic performance.

2. Waterproofing
To address the issue of water leakage through the joints of the prefabricated floor slabs, a double-layer waterproofing process should be strictly implemented. The waterproofing on the walls of kitchens, bathrooms, and balconies should cover the specified heights, with the waterproofing height in the shower area reaching at least 1.8 meters. The ground waterproofing should extend more than 30 centimeters up the walls. The backfill layer in the bathroom should be equipped with a waterproof inspection port and a secondary drainage system to prevent water accumulation and resulting odors. If the original waterproofing layer is severely aged, it should be completely removed, and a new waterproofing coating should be applied, followed by a closed water test to verify its effectiveness.

3. Appearance and Functional Renovation
The size of the main door can be enlarged as needed to enhance spatial permeability, while optimizing the indoor layout (e.g., removing non-load-bearing walls). For exterior wall renovation, steel bar planting and grouting should be carried out first to enhance the wall's tensile strength, followed by repainting with waterproofing coating. If there are hollow areas or cracks in the walls, they should be removed and repaired with high-strength mortar. Additionally, insulation layers can be added or energy-efficient doors and windows can be installed to improve the house's thermal insulation performance.

4. Selection of Renovation Paths
Renovation plans should be formulated based on the house's safety appraisal grade. If the house is appraised as Grade D (entire building in danger), priority should be given to demolition and reconstruction or expropriation and renovation. If it is appraised as Grade C (local danger),隐患 can be eliminated through reinforcement and repair (e.g., adding structural columns, carbon fiber reinforcement) or original demolition and reconstruction. The specific path should be determined based on planning conditions, financial capabilities, and the results of resident consultations, such as government-led expropriation and relocation, owner-initiated reinforcement, or joint funding for reconstruction.