Planning Foundations & Site Preparation for Volumetric Steel Modules
Soil bearing geotechnical surveys, reinforced concrete raft designs, steel base plate tolerances (±5 mm), and drainage coordination before module arrival.
1. Geotechnical Soil Investigation & Point Load Concentrations
Unlike traditional continuous brick walls that distribute load uniformly along footing trenches, volumetric steel modules concentrate their structural dead and live loads primarily through vertical corner columns directly onto foundation nodes.
A certified geotechnical soil report (specifying allowable bearing capacity in kN/m² and ground water table depth) is mandatory. SERMODULA structural engineers calculate exact corner column load reactions (kN) to guide your local foundation designer.
2. Concrete Raft Tolerances (±5 mm) & Mechanical Anchor Interfaces
Industrial modular components are fabricated with millimeter tolerances. Therefore, the concrete foundation surface must achieve a strict flatness tolerance within ±5 mm across the entire building perimeter.
Cast-in-place steel anchor plates or heavy chemical anchor studs fix the lower chassis of the modules against earthquake uplift and wind overturning forces.
Technical Data & Benchmark Matrix
Reinforced Concrete Raft Slab
Strip Footings with Crawl Space
Piled Foundations with Ground Beams
Engineered Ground Screws
| Foundation Type | Applicability in Modular Housing | Key Advantages | Relative Civil Cost |
|---|---|---|---|
| Reinforced Concrete Raft Slab | Primary Recommended Standard (90% of sites) | Highest stability, simple installation, uniform load transfer | Moderate / Standard |
| Strip Footings with Crawl Space | Sloping terrain, flood zones, high radon regions | Enables easy underfloor utility maintenance inspections | Moderate to High |
| Piled Foundations with Ground Beams | Weak soils, reclaimed land, peat/loose silt layers | Deep load transfer to solid bedrocks, zero settlement risk | High |
| Engineered Ground Screws | Lightweight temporary units, protected eco-reserves | Zero concrete footprint, 100% reversible, fast installation | Economical |
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