Small Prefabricated Components for Building Construction
Small prefabricated components for building construction generally refer to components with a single-piece volume within a certain threshold (such as 0.1m³ or 0.05m³) and for which no separate sub-item is listed in the relevant engineering quotas. Specific determination requires consideration of regional, industry, and quota specifications. If a quota has a separate listing for a component, it is not classified as a small component and should use the corresponding exclusive sub-item.
Common Types and Scope
Common small prefabricated components in building construction include:
- Structural Components: Parapets, flues, ventilation ducts, garbage chutes, stair treads, balcony railings, chimneys on roofs, and foundation walls.
- Functional Components: Prefabricated pool troughs, water troughs, pool feet, garbage bins, low walls on step surfaces, flower beds, and coal bins.
- Decorative and Auxiliary Components: Brick door stools and some decorative components.
These components are typically small in volume, have a single function, but are numerous and widely distributed, significantly impacting the overall quality and efficiency of the project.
Evolution of Construction Techniques
Traditional construction often used fixed steel or wooden molds for on-site pouring, which was prone to appearance defects (such as honeycombing, pitting, and dimensional deviations). To improve quality, the industry has gradually adopted standardization and centralized prefabrication:
- Mold Optimization: Using steel molds and high-strength plastic molds to improve the surface flatness and dimensional accuracy of components.
- Concrete Mix and Techniques: Optimizing the concrete mix ratio, enhancing vibration compaction, and reducing internal defects.
- Curing Improvements: During centralized factory prefabrication, attention is paid to mold release quality and curing conditions, often using atomized spraying for moisture retention and underfloor heating to accelerate strength growth, with a typical curing period of 7 days to ensure component durability.
Technological Innovation
In 2026, China Railway No.3 Engineering Group obtained a patent for a 'Small Prefabricated Component Automated, Unmanned Flexible Production System,' marking the industry's shift towards intelligent transformation. This system achieves efficient and precise production of components through automated production lines and flexible manufacturing techniques, reducing manual intervention, improving quality stability and production efficiency, and providing technical support for the large-scale application of small prefabricated components.
Application Significance
The standardization and factory production of small prefabricated components not only improve component quality but also shorten on-site construction periods and reduce overall costs, aligning with the trend of building industrialization. As technology advances, their application scope will further expand, becoming an indispensable part of modern building construction.
