The 25mm thick heavy metal tube is driven With all the end closed by a steel shoe. On reaching the necessary driving resistance, a full duration cage is decreased in to 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-ban00975.blog2freedom.com/32568394/the-5-second-trick-for-cast-in-situ-piles-in-dhaka