| Parameter Category | Parameter Name | Specific Requirements/Specifications | Detection Tool/Method | Remarks |
|---|---|---|---|---|
| Basic Product Parameters | Material | Q235B carbon steel / Q355B alloy steel (optional anti-corrosion treatment: hot-dip galvanizing, galvanizing thickness ≥85μm) | Material test report, thickness gauge | Corrosion resistance meets GB/T 13912-2020 standard |
| Pile Diameter | Common specifications: 89mm, 114mm, 140mm, 168mm; allowable tolerance: ±2mm | Vernier caliper | Customizable according to project design | |
| Pile Length | Common specifications: 1200mm-2500mm; allowable tolerance: ±5mm | Tape measure, steel ruler | Determined based on local frost line and soil conditions | |
| Helix Specification | Helix diameter: 200mm-400mm; helix thickness: 6mm-10mm; number of helixes: 1-3 | Vernier caliper, tape measure | Multi-helix type for higher bearing capacity | |
| Installation Quality Parameters | Verticality | Vertical deviation ≤1‰ of the pile length | Theodolite, level | Avoid uneven stress on the pile body |
| Embedding Depth | Consistent with design requirements; allowable deviation: ±50mm | Tape measure, depth gauge | Ensure stability against seasonal freezing-thawing | |
| Pile Spacing & Position | Pile spacing: 2000mm-3000mm (per design); horizontal position deviation ≤±100mm | Tape measure, total station | Guarantee installation accuracy of subsequent PV modules | |
| Pile Top Elevation | Consistent with design requirements; allowable deviation: ±30mm | Level, level rod | Adjustable with gaskets if needed | |
| Performance Parameters | Vertical Bearing Capacity | ≥30kN (for φ140×1800mm single-helix pile in common soil) | Static load test | Varies with soil type and pile specification |
| Horizontal Bearing Capacity | ≥8kN (for φ140×1800mm single-helix pile in common soil) | Horizontal load test | Ensure resistance to wind load and seismic force | |
| Appearance Quality Parameter | Pile Body Integrity | No cracks, deformation, or corrosion; welds smooth without slag inclusion | Visual inspection, magnifying glass | Defective piles must be replaced immediately |
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