Most sheet piles rely on their bending strength and stiffness to retain the soil or water, whereas straight web sheet piles are designed to form cylindrical structures, generally closed, retaining a soil backfill.
Straight Web sheet piles are mostly used on projects where rock layers are close to ground level, where the excavation depth removes toe support, or where anchoring cannot be reasonably provided. Straight web sheet pile structures are constructed as circular cells or diaphragm walls depending on the site characteristics or the particular requirements of the project. The large diameter of each cell, and contained soil mass ensures stability of the structure.
The forces developing in straight web sheet pile sections are essentially horizontal traction forces requiring interlocks especially designed for declutching resistance, corresponding to the horizontal force in the web of the pile. Straight web sheet piles can rotate up to 4.5 degrees per interlock, greater rotation can be achieved by special bending of the sheet pile up to 12 degrees.
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AS500 Series of Straight Web Pile Sheets
| Section | Width* | Thickness | Interlock Strength | Interlock Rotation** | Sectional Area | Mass | Section Modulus | Moment of Inertia | |
| b mm | t mm | kN/m | δ ° | cm2/m | Pile kg/m |
Wall kg/m2 |
cm3/m | cm4 | |
| AS 500 9.5 | 500 | 9.5 | 3000 | 4.5 | 162.6 | 63.8 | 128 | 46 | 168 |
| AS 500 11.0 | 500 | 11 | 3500 | 4.5 | 180.0 | 70.6 | 141 | 49 | 186 |
| AS 500 12.2 | 500 | 12 | 5000 | 4.5 | 189.2 | 74.3 | 149 | 51 | 196 |
| AS 500 12.5 | 500 | 12.5 | 5500 | 4.5 | 194.5 | 76.3 | 153 | 51 | 201 |
| AS 500 12.7 | 500 | 12.7 | 5500 | 4.5 | 196.4 | 77.1 | 154 | 52 | 204 |
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