The 25mm thick weighty metal tube is pushed Along with the end closed by a steel shoe. On reaching the necessary driving resistance, a full length cage is decreased in on 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-ban26935.thelateblog.com/33378619/the-5-second-trick-for-cast-in-situ-piles