The 25mm thick heavy steel tube is driven While using the close shut by a steel shoe. On reaching the required driving resistance, a full duration cage is decreased in for the tube and stuffed with large slump concrete. The tube is then vibrated out leaving a shaft of concrete. https://mylesavjvi.newsbloger.com/33175222/the-smart-trick-of-cast-in-situ-piles-in-dhaka-that-no-one-is-discussing