Stage 3: Installation of bored piles

1. Trim the top of the sheet piles.
2. Install 600 mm diameter reinforced concrete bored piles with cast-in steel columns.
3. Vibrate casing to toe into the sandstone.
4. Auger out pile socket into the sandstone.
5. Insert reinforcement cage and place concrete by tremie to basement level.
6. Partly oscillate (vibrate) out casing to almost level with the top of the concrete pile.
7. Plunge steel column into wet concrete.
8. Backfill with fine granular material after concrete has set.
9. Remove casing completely.