The 25mm thick significant metal tube is pushed Together with the end closed by a metal shoe. On achieving the demanded driving resistance, a full duration cage is decreased in for the tube and crammed with high slump concrete. The tube is then vibrated out leaving a shaft of concrete. https://cast-in-situ-piles-in-dha31638.blazingblog.com/32639126/5-simple-techniques-for-cast-in-situ-piles