How to Renovate Prefabricated Panel Houses

The following methods can be referred to for renovating prefabricated panel houses:

1. Overall Structural Reinforcement and Conversion to a Frame System For prefabricated panel houses where demolition and new construction are not permitted (such as a three-story building from the 1990s in Xiantao, Hubei), an overall structural reinforcement approach can be adopted, converting the structure to a frame system. Specific operations include reinforcing load-bearing components such as beams and columns. During construction, continuous watering should be applied to concrete components to ensure they reach the required strength. This method is suitable for houses with aging structures but without severe settlement or tilting, significantly enhancing overall stability.

2. Full Process of Wall Removal and Beam Replacement

• Construction Preparation:

  • Conduct a comprehensive structural safety assessment, focusing on inspecting the width of cracks in prefabricated panels (requiring special treatment if exceeding 0.3 millimeters) and the connection status with ring beams (requiring replacement if bolt corrosion exceeds 30%).
  • Remove existing exterior wall tiles and erect a temporary support system: Set up steel pipe supports every 1.2 meters along the length of the prefabricated panels, and use H-section steel beams for critical node replacement (with a cross-section of at least 200*200 millimeters) to ensure structural safety during demolition.

• Structural Treatment:

  • Remove the original filling material at panel joints, implant No. 6 deformed steel bars, and pour C30 fine aggregate concrete to enhance inter-panel connections.
  • Add structural columns at the four corners of the house (with a cross-section of 240*240 millimeters), using No. 6 and No. 8 steel bars for reinforcement and anchoring them to the floor slab to improve seismic performance.

• Construction Sequence:

  • Follow the principle of "middle first, then sides," carrying out segmented and symmetrical demolition, with a daily demolition volume not exceeding 30% of the total floor area.
  • Continuously monitor stress changes in the support system during demolition, prohibiting violent demolition methods such as heavy hammer impacts to avoid structural instability.

3. Thorough Assessment and Customized Plan Commission a professional team to conduct a comprehensive inspection of the house, using professional instruments to detect issues such as wall cracks, steel bar corrosion, and foundation settlement. Based on the assessment results, customize a renovation plan:

• Wall cracks: Use grouting repair for cracks less than 0.3 millimeters wide, and reinforce severe cracks with steel plates.
• Roof leakage: Relay the waterproof layer and optimize the drainage slope.
• Unstable foundation: Reinforce it through methods such as piling or grouting to ensure the bearing capacity meets requirements.

4. Functional Upgrades

• Sound Insulation: Install sound insulation boards on walls and replace windows with double-glazed units to effectively reduce noise interference.
• Other Upgrades: Depending on needs, modify the spatial layout (such as removing non-load-bearing walls to expand the living room), install elevators to enhance convenience, or update water and electricity pipelines to meet modern living requirements.