Method for well boring - involves using tube well as borehole liners

摘要

The method of well-boring it using wellpoint or vacuum lance, uses the well tube as bore hole liners. They are used with a self-boring lance. The well tube (1) is rotated in the ground and has a pointed tip (2). A helical screw thread or vane (3) scrapes material off the walls of the borehole and displace it upwards. USE/ADVANTAGE - Well-boring appts. The amt. of work is reduced as also is the number of men required.