Atlas of Sizes for Prefabricated House Bases

Currently, a complete standard atlas directly targeting 'prefabricated house bases' has not been found, but relevant information on the sizes of prefabricated components can provide design references, as detailed below:

I. Common Sizes of Prefabricated Courtyard Wall Bases

As supporting components for the附属结构 (ancillary structures) of houses, the size ranges of prefabricated courtyard wall bases are relatively well-defined:

• Height: Typically ranges from 300mm to 600mm, depending on the height of the courtyard wall, wind resistance stability, and foundation bearing capacity. For example, low courtyard walls (height ≤ 1.5m) can use a 300mm base, while taller courtyard walls (height > 1.5m) are recommended to have a base height of over 500mm.
• Width: Commonly ranges from 200mm to 400mm. The width should be proportionally designed with the height to avoid excessive local compressive stress due to an overly small cross-section.
• Length: Adjusted according to the span of the courtyard wall, generally ranging from 1m to 3m. If the span exceeds 3m, segmented design with the addition of expansion joints or reinforcement measures is required.
  Note: These sizes represent general ranges, and actual engineering projects require customization based on geological conditions, load requirements, and construction techniques.

II. Relevant References from Standard Atlases of Prefabricated Buildings

Although the standard atlases of prefabricated buildings issued by Hunan Province do not directly involve house bases, the size design principles of some prefabricated components can be applied.

• 'Truss Reinforced Concrete Composite Slab (60mm Thick Base Plate)': Introduces the concept of 'standard plates', with the base plate's characteristic span designed in 3M modules (e.g., 3m, 6m), and a standard width of 2100mm, accompanied by sub-standard specifications such as 900mm and 1200mm. Such modular design can optimize the production efficiency of prefabricated components, and the design of house bases can refer to its principles of span and width module coordination.
• Other Atlases: Atlases such as 'Prefabricated Concrete Sandwich Composite Floor Slabs' and 'Prefabricated Reinforced Concrete Stair Slabs', although focusing on components like floor slabs and stairs, unify construction methods and technical parameters, emphasizing the combination of 'standardization and customization'. The design of house bases can draw on details such as connection node construction and steel bar configuration.

III. Indirect References from Sizes of Prefabricated Slabs

The size ranges of residential prefabricated slabs (e.g., floor slabs, wall panels) can provide auxiliary references for the design of house bases:

• Span: The longest ordinary slab is 4200mm, and the longest residential slab is 4.2 meters (custom-made required). If the house base needs to bear significant loads, this span range can be referenced to optimize structural layout.
• Width: Mainly 500mm and 600mm. The width design of house bases can be coordinated with these dimensions to facilitate construction对接 (connection).
• Thickness: Commonly 120mm and 150mm. The thickness of house bases needs to be determined based on foundation reaction force and material strength calculations, typically not less than 200mm (thicker for soft soil foundations).

IV. Suggestions for Obtaining Complete Atlases

For professional design materials, the following avenues can be referenced:

1. Official Atlases: Consult the standard atlases of prefabricated buildings issued by the Hunan Provincial Housing and Urban-Rural Development Department (e.g., 'Truss Reinforced Concrete Composite Slab'), whose modular design methods are of general applicability.
2. Enterprise Customization: Contact prefabricated component manufacturers, providing parameters such as house loads and geological conditions, to obtain customized base design drawings and construction details.