How to Renovate a Prefabricated Floor Slab House

The renovation of a prefabricated floor slab house requires a comprehensive approach covering structural safety, functional upgrades, and more. The specific methods 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 the crack width of the prefabricated slabs (special treatment is required if the width exceeds 0.3 mm) and the connection status between the slabs and the ring beams (bolts with a rust rate exceeding 30% need to be replaced). For minor wall cracks, grouting repair can be used; for severe cracks, steel plate reinforcement is necessary. Additional structural columns (with a cross-section of 240×240 mm) should be added at the four corners of the house, reinforced with No. 6 and No. 8 steel bars and connected to the floor slab to enhance overall stability.

2. Roof and Wall Renovation

1. Roof Renovation: Remove the original wooden roof and pour a new concrete roof without changing the original height to ensure waterproof performance and structural durability, while providing a foundation for subsequent laying of various roofing materials (such as tiles and metal sheets). If there are water leakage issues on the roof, a new waterproof layer needs to be applied.
2. Wall Renovation: After removing the original exterior wall tiles, re-plaster and grout with steel bars to improve the load-bearing capacity and tensile properties of the walls. If the foundation is unstable, pile foundation reinforcement is required to prevent settlement.

3. Slab Joint and Support System Treatment

1. Slab Joint Treatment: Remove the original joint filling material, insert No. 6 deformed steel bars, and pour C30 fine aggregate concrete to enhance the connection strength of the slab joints.
2. Support System Construction: Before construction, set up steel pipe supports every 1.2 meters along the length of the prefabricated slabs, and use H-shaped steel beam underpinning (with a steel beam cross-section of ≥200×200 mm) at key nodes to ensure structural safety during demolition.

4. Construction Sequence and Precautions

Adopt the principle of demolishing from the middle to the sides in sections, maintaining symmetrical demolition, with a daily demolition volume not exceeding 30% of the total floor area. During demolition, real-time monitoring of the stress changes in the support system is required. The use of heavy hammers for impact demolition is prohibited to avoid impacting the foundation structure.

5. Functional Upgrades

1. Sound Insulation Optimization: Install sound insulation boards and replace windows with double-glazed windows, which can improve sound insulation by 70%.
2. Waterproofing and Foundation Reinforcement: Re-lay a waterproof layer for roof water leakage issues; if the foundation is unstable, enhance stability through pile foundation reinforcement.

Renovation must strictly follow regulations to ensure that structural safety and functional upgrades are achieved simultaneously.