The AU steel sheet piles proposed for the main wall are custom-designed for this project. The AU14, AU16, AU18, AU20, AU23, and AU25 steel sheet piles are sourced from Acelor. The client and their engineers have received complete calculations of the section modulus for both the custom and standard piles. The backfill in the anchorage area should be compacted to achieve the required resistance. However, the material adjacent to the wall should have sufficient porosity to ensure adequate drainage. The table shows a GU steel sheet pile segment before corrosion damage.

PU steel sheet piles have a modular construction, allowing the sheet thickness to be adjusted to suit different stress levels and corrosion zones. The table below lists the minimum diameters of circular cofferdams that can be constructed using various steel sheet pile sections. Drain holes should be tapped in the wall at an appropriate frequency. PU12, PU12 10/10, PU18, PU22, PU28, and PU32 steel sheet piles are generally suitable for HZ and OZ steel sheet piles.

For seawalls with insufficient height, it is recommended to use a pebble or gravel field to create a drainage field. The diameters are for reference only, as the actual interlocking deviation achieved will depend on the pile length, pile cross-section, and required penetration depth. Table 3 shows the section modulus and flexural capacity of various sections of GU sheet piles before corrosion damage. All calculations were performed in accordance with the guidelines specified in BS 5950 Part 5. Smaller diameters can be achieved by introducing angled piles, but larger diameters are achieved if press-fit or welded pile pairs are used. Types GU6N, GU8N, GU16N, GU18N, GU16-400, and GU18-400 are superior to Thyssen and ThyssenKrupp sheet piles.

Hard facings made of reinforced concrete are also effective in resisting erosion caused by overtopping. They can be driven to form a complete circle, eliminating the need for angled piles. The maximum deviation angle for AZ piles is 5°. To be effective, such hard facings must be built on a solid and well-drained foundation.

Specifications