Basement Prefabricated Concrete House

The basement prefabricated concrete house can be realized through modular prefabricated components combined with adaptive design for underground spaces, with the core being the integration of the high-strength characteristics of prefabricated components with the waterproofing and seismic resistance requirements of the underground environment.

1. Structural Design and Material Characteristics

Prefabricated components typically adopt a full-frame shear wall structure, using C35 concrete and Φ14 deformed steel bars as the main materials. The reinforcement ratio of a single module reaches 1.2%, with a wall thickness of 200mm. This design enables the components to have a compressive strength of 30MPa, equivalent to being able to withstand 3,000 tons per square meter, effectively resisting the pressure of the underground soil layer. The modules are connected through prestressed bolts (with a tensile strength of 25 tons) and mortise-and-tenon joints similar to those in ancient architecture, forming an overall load-bearing system. In the Wenchuan earthquake simulation test, the overall displacement was only 3cm under a seismic intensity of 9 degrees, indicating excellent seismic performance suitable for the underground environment.

2. Adaptive Renovation for Underground Spaces

1. Waterproofing: Due to the high humidity in the underground environment, waterproof coatings need to be applied or waterproof membranes laid on the surface of the prefabricated components, with particular attention paid to the module joints. Reference can be made to the roof pouring technology of underground houses, where concrete pouring and filling are carried out after the component assembly to form a continuous waterproof layer.
2. Support and Fixation: Uneven settlement may occur in the underground soil layer, so adjustable support bases need to be installed at the bottom of the prefabricated components. The height can be adjusted through bolts or hydraulic devices to ensure the structural levelness. At the same time, horizontal tie bars are added around the components to enhance the anchoring force with the underground soil layer.
3. Ventilation and Lighting: Ventilation openings and light wells need to be reserved in the underground space. When designing the prefabricated components, pipe penetrations should be reserved to avoid damaging the structural integrity through later excavation.

3. Optimization of the Construction Process

1. Module Prefabrication: Component production, including walls, floor slabs, beams, and columns, is completed in the factory to ensure dimensional accuracy and quality stability.
2. On-site Assembly: Modules are hoisted according to the design drawings and connected through prestressed bolts and mortise-and-tenon joints, reducing the amount of on-site wet work.
3. Post-assembly Treatment: After assembly is completed, waterproof sealing treatment is carried out on the module joints, wall-penetrating pipes, and other parts, and the soil is backfilled to the designed elevation.

4. Application Scenarios and Advantages

Basement prefabricated concrete houses are suitable for scenarios such as underground garages, air-raid shelters, and emergency shelters. Their advantages include a short construction period (30%-50% shorter than traditional cast-in-place construction), high structural strength, good seismic performance, and the ability of modules to be repeatedly disassembled and assembled, adapting to different underground space requirements.