Prefabricated Concrete House Assembly

Prefabricated concrete house assembly is a construction method that involves industrial production of building components and on-site assembly, offering advantages such as efficiency and environmental friendliness.

Assembly Types and Technologies

The main types of prefabricated concrete house assembly include panel-based, box-based, and frame-based assembly, with technologies encompassing prefabricated concrete structures and steel structures. The components include prefabricated products such as beams, slabs, walls, and columns, which are modularly combined through standardized design. For example, in a factory, workers assemble metal steel plates into casting molds using bolt connectors. After applying mold release agents, they cross-bind steel bars into a mesh framework and place connectors, then fill with concrete and vibrate to remove air bubbles. Finally, they cover the molds with plastic greenhouses to heat and promote cement hydration, forming high-precision components.

Construction Process and Foundation Treatment

The construction process is divided into two stages: factory prefabrication and on-site assembly. The factory stage adopts a parallel operation mode, with automated production lines and three-dimensional warehouses simultaneously producing different components, reducing the construction period by more than 60% compared to traditional methods. The on-site stage requires foundation work first: digging a pit about 1 meter deep on the building site, laying a moisture-proof PE film at the bottom, and pouring more than 10 cm of "discarded concrete" as the base. After solidification, guide steel plates are installed to position the prefabricated concrete piles, and finally, the large base slab is placed on the guide steel plates. After the components are transported to the site, they are quickly connected using bolts, welding, or embedded parts to form the main structure of the rough house.

Advantages and Limitations

Advantages:

1. Short construction period: After adopting this technology in a real estate project in Shanghai, the completion and delivery period was shortened from 2.5-3 years to 1 year, and the on-site labor force was reduced by about 50%.
2. Controllable quality: Factory standardized production eliminates manual errors, with component dimensional accuracy reaching the millimeter level.
3. Environmental protection and energy efficiency: Reduces on-site noise, dust, and construction waste, with material loss rate reduced by more than 30%.
4. Convenient maintenance: Modular design facilitates later renovation and repair.

Limitations:

1. High industrial base requirements: It requires a complete technical system, production system, and industrial cluster support, and is currently only widespread in regions such as the Yangtze River Delta and Pearl River Delta.
2. High initial cost: Mold development, transportation logistics, and other links increase the overall cost, but in the long run, it can be offset by large-scale production.

This technology reconstructs the construction process through industrial thinking and represents the future direction of construction industrialization, but it needs to be promoted cautiously in combination with regional industrial conditions.