Hitting Load-Bearing Walls in Prefabricated Panel Houses

It is not recommended to hit load-bearing walls in prefabricated panel houses. If modification is necessary, strict adherence to professional procedures and acceptance of high risks are required.

I. Why Can't Load-Bearing Walls Be Hit?

1. Structural Safety Risks
   Load-bearing walls in prefabricated panel houses are the core structures supporting the upper floors and directly bear the weight of the prefabricated panels. Removing them destroys the structural integrity and can easily lead to building instability. For example, in rural self-built houses, prefabricated panels are often directly placed on the central load-bearing walls, and their removal can trigger local collapses. Tests by the China Academy of Building Research show that the seismic performance of prefabricated panel buildings is generally lower than current standards, and removing load-bearing walls further reduces their seismic capacity, increasing the risk of collapse by 3-5 times compared to modern frame structures during earthquakes of magnitude 6 or higher.

2. Aging of Prefabricated Panels
   In houses over 30 years old, the prefabricated panels may experience reduced load-bearing capacity due to material aging, doubling the risks of removing load-bearing walls. Even without earthquakes, daily loads can cause cracks or local collapses due to structural imbalance.

3. Real-World Case Warnings

   • In 2023, a 31-story residential building in Songbei District, Harbin, suffered wall cracks from floors 4 to 21 and the emergency evacuation of over 200 households due to a load-bearing wall being hit.
   • A 5-story residential building in Fenghua City, Ningbo, Zhejiang, collapsed after the owner privately removed a load-bearing wall, altering the building's load-bearing system.

4. Legal Prohibitions
   According to Article 69 of the Regulation on the Administration of Construction Project Quality, unauthorized alteration of load-bearing structures can result in fines ranging from 50,000 to 1,000,000 yuan, along with liability for compensation.

II. What Conditions Must Be Met for Necessary Modifications?

1. Professional Appraisal
   Commission a professional institution to appraise the wall's nature (costing approximately 500-1,500 yuan) to confirm whether it is a load-bearing wall and the feasibility of modification.

2. Load Transfer Design
   Install steel beams on the roof to transfer loads (costing approximately 200-400 yuan per meter), ensuring the upper structure's weight is borne by the new beams.

3. Connection of New and Old Structures
   Use chemical anchors to reliably connect the new and old structures (each anchoring point must bear a load of ≥1 ton), preventing local stress concentrations from causing cracks.

III. Recommended Alternative Solutions

1. Half-Wall Partitions
   Retain the lower part of the wall at a height of 1-1.2 meters and design the upper part as open, balancing light and structural safety.

2. Arched Doorways
   If a doorway is needed, keep the span under 1.8 meters and use an arched design to disperse loads, reducing the impact on the wall.

3. Lightweight Partitions
   Switch to gypsum board partitions (costing approximately 80-120 yuan per square meter) to redivide spaces, avoiding damage to load-bearing structures.

Conclusion: Modifying load-bearing walls in prefabricated panel houses carries extremely high risks. Alternative solutions should be prioritized unless absolutely necessary. If modification is unavoidable, strict adherence to professional procedures and acceptance of legal liability are essential. Do not endanger lives and property for short-term needs.