Yidong Prefabricated Wall Panels

If Yidong houses involve prefabricated wall panels, they belong to the type of building that uses prefabricated concrete panels as walls. This type of building has advantages such as high construction efficiency and low cost, but it also has performance defects in earthquake resistance and fire prevention. Its service life is affected by multiple factors, and installation requires standardized operations. Moreover, current policies mainly focus on repair and renovation.

Definition and Types of Prefabricated Wall Panels

Prefabricated wall panels are cement components prefabricated in factories. During production, wooden models are nailed, steel bars are arranged, and cement is poured to form the panels. They are divided into two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, making it suitable for building scenarios sensitive to weight.

Advantages and Disadvantages of Houses with Prefabricated Wall Panels

Advantages:

1. High Construction Efficiency: Components are produced in a standardized manner in factories, and on-site assembly is fast, which can shorten the construction period.
2. Lower Cost: Mass production reduces material and labor costs. Some component materials can be recycled, and the fully disassemblable nature facilitates transportation, further saving costs.
3. Environmental Protection: Factory prefabrication reduces on-site construction dust and noise, aligning with the trend of green buildings.

Disadvantages:

1. Poor Earthquake Resistance: The overall integrity is weaker than that of cast-in-place structures, making them prone to damage during earthquakes.
2. Insufficient Fire Resistance, Thermal Insulation, and Sound Insulation: Hollow structures or improper material selection may lead to performance defects, requiring additional fireproof layers or thermal insulation materials.
3. Easy Ground Water Seepage: Improper joint treatment or failure of the waterproof layer may result in leakage problems.
4. Difficult Structural Modification: The integrated design of steel bars and concrete inside the walls limits the space for later modifications.

Service Life and Influencing Factors

The service life of prefabricated panels is usually 30 to 50 years, and the actual service life is affected by the following factors:

• Material Quality: The cement grade and steel bar specifications directly affect durability.
• Construction Quality: Details such as component connections and joint treatment determine overall stability.
• Usage Environment: Humid and corrosive environments accelerate material aging.
• Maintenance Condition: Regular inspections and repairs can extend the service life.

Installation Specifications and Requirements

After the prefabricated wall panels are in place, temporary diagonal braces and top limit devices need to be set up. Two diagonal braces of different lengths are used for fixation to adjust the verticality and stability. During installation, it is necessary to ensure tight component connections to avoid safety hazards caused by looseness.

Policy Background and Development Trends

Most residential buildings constructed in China before 1985 used prefabricated panel structures. With the advancement of building technology, cast-in-place concrete and prefabricated buildings have gradually replaced traditional prefabricated panel houses. Since 2022, the old renovation policy has been implemented, focusing on the repair and renovation of prefabricated panel houses and only demolishing buildings that meet the criteria for dangerous houses, aiming to balance safety needs and resource utilization efficiency.