Steel H-Piles are severe-duty structural beams designed specifically for deep foundation applications. Unlike standard structural steel used in buildings, H-Piles are engineered to transfer massive vertical loads through soft soil layers directly onto bedrock (end-bearing) or dense soil strata.
The "Square" Difference: HP vs. W-Beams
The most common confusion in the industry is distinguishing H-Piles (HP shapes) from Wide Flange beams (W shapes). While they look similar, their geometry is functionally different:
HP Shapes (Piling)
- ✔ Equal Thickness: The flange and web are the exact same thickness. This ensures uniform strength during the violent impact of driving.
- ✔ Square Profile: The depth of the beam is roughly equal to the width of the flange (e.g., an HP12 is 12" deep and 12" wide).
W Shapes (Structural)
- ✖ Thinner Webs: The web is thinner than the flange because it primarily resists shear forces in building frames.
- ✖ Vulnerable to Impact: If driven into hard ground, the thin web of a W-beam often buckles or "accordions" under the hammer.
Standard Specifications
H-Piles are almost exclusively manufactured to ASTM A572 Grade 50 standards, offering a yield strength of 50,000 psi. While A36 (36,000 psi) was common in the past, modern rolling mills produce Grade 50 as the standard economy grade.
| Shape | Depth (in) | Flange Width (in) | Weight (lbs/ft) |
|---|---|---|---|
| HP 8 | 8.00 | 8.00 | 36, 48 |
| HP 10 | 10.00 | 10.00 | 42, 57 |
| HP 12 | 12.00 | 12.00 | 53, 63, 74, 84 |
| HP 14 | 14.00 | 14.00 | 73, 89, 102, 117 |
Common Applications
Because of their small surface area and high structural capacity, H-Piles are the go-to solution for specific environments:
- Bridge Piers: The preferred choice for DOT (Department of Transportation) bridge work due to high axial load capacity when driven to rock.
- Marine Structures: Used in dolphins and fender systems where the small surface area minimizes wave and current drag compared to large pipe piles.
- Retaining Walls: "Soldier Piles" use H-beams driven vertically with timber or concrete lagging placed between the flanges to hold back soil during deep excavation.
Deep Foundations
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Protect the beam tip during driving with cast steel points designed specifically for HP shapes.
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